WO2020001504A1

WO2020001504A1 - Synchronization method and apparatus

Info

Publication number: WO2020001504A1
Application number: PCT/CN2019/093123
Authority: WO
Inventors: 李业兴; 王远; 于峰; 王岩; 苏琪; 陈中平
Original assignee: 华为技术有限公司
Priority date: 2018-06-26
Filing date: 2019-06-26
Publication date: 2020-01-02

Abstract

Disclosed are a synchronization method and apparatus used for meeting, in a mobile network and Ethernet connection scenario, time precision requirements of an industrial plant. In the method, a first device determines seventh time stamp information according to time stamp information of sending and receiving packets in a mobile network, so that the second device calculates a time deviation between the first device and the second device according to the seventh time stamp information and time for sending and receiving packets in the Ethernet, so as to carry out time synchronization. In the method, since the impact caused by transmission time delay between the first device and the second device can be avoided, in the mobile network and Ethernet connection scenario, the time precision requirements of the industrial plant can be met.

Description

Synchronization method and device

This application requires that the Chinese Patent Office be filed on June 26, 2018 with the application number 201810672083.7, the invention name be `` A Synchronization Method and Device '' and the Chinese Patent Office on October 08, 2018 with the application number 201811168721.8, the invention The priority of a Chinese patent application entitled "A Synchronization Method and Apparatus" is incorporated herein by reference in its entirety.

Technical field

The present application relates to the field of communication technologies, and in particular, to a synchronization method and device.

Background technique

The IEEE 802.1AS protocol defines a master clock selection and negotiation algorithm, path delay measurement and compensation, and a clock frequency matching and adjustment mechanism. Communication equipment exchanges standard Ethernet messages, synchronizes the time of each node of the network to a common master clock, and defines a generalized precise clock synchronization system. Specifically, the 802.1AS protocol defines synchronization across the network by hop-by-hop synchronization, that is, starting from the master clock node (hereinafter referred to as the master) to send 802.1AS synchronization packets to neighboring nodes (hereinafter referred to as the slave), and each slave refers to the master After clock synchronization, the slave exchanges 802.1AS synchronization packets with neighboring nodes as its master, and calculates the time offset (Offset) and / or frequency deviation between the master and slave clocks to complete the clock synchronization.

Specifically, the 802.1AS time synchronization mechanism is as follows: the master and the slave send 802.1AS messages to each other, and the time offset Offset is calculated based on the time when the two parties send and receive messages. However, when the master sends a message to the slave and the slave sends a message to the master, there is a transmission delay and the transmission delay is unknown. The transmission delay must be considered when calculating the time offset Offset. The 802.1AS time synchronization is based on the same delay in sending and receiving packets, that is, the same transmission delay can achieve accurate time synchronization. Now in the fixed network, because the adjacent two nodes are wired directly, the transmission delay does not exceed us, so the accuracy of the 802.1AS protocol in the fixed network can reach us level, which meets the requirements.

The 802.1AS frequency synchronization mechanism is as follows: the master sends 802.1AS packets to the slave at two different time points, and the slave calculates the frequency deviation through the master's two sending times and two receiving times. In the same way, the principle of 802.1AS frequency synchronization is that the two packets have the same time delay during transmission to achieve accurate frequency synchronization. Similarly, it can meet the demand in the fixed network.

At present, the IEEE 802.1AS protocol is widely used. For example, a time-sensitive network (TSN) is an Ethernet network in an industrial plant. In order to meet the high-precision clock synchronization requirements in an industrial plant, TSN uses the 802.1AS protocol as its protocol specification for clock synchronization. However, in the actual industrial factory scenario, the mobile network needs to be connected to the TSN. The mobile network is used as a transmission path to provide communication services for the industrial factory. This requires that the mobile network also support the 802.1AS protocol. However, when two adjacent nodes in the TSN (such as a terminal device and a user plane network element) perform clock synchronization, during the message transmission process, they will pass through multi-hop devices (such as access devices) in the mobile network. Therefore, Both the same-direction transmission delay and the round-trip transmission delay when packets are transmitted between the adjacent nodes may be different. Therefore, the 802.1AS synchronization mechanism cannot meet the requirements of the time accuracy of industrial plants.

Summary of the invention

The present application provides a synchronization method and device, which are used to realize the time accuracy requirement of an industrial factory in a scenario where a mobile network is connected to an Ethernet network (for example, TSN).

In a first aspect, this application provides a synchronization method, which includes:

First, the first device sends a first message to the access device. The first message carries the first time stamp information and determines the second time stamp information. The first time stamp information is when the first device sends the first message. The time in the Ethernet network, the second time stamp information is the time in the mobile network when the first device sends the first message; then, the first device receives the second message from the access device, and the second message carries the third Timestamp information and fourth timestamp information, the third timestamp information is the time in the mobile network when the second device receives the third message sent by the access device to the second device based on the first message, and the fourth timestamp The information is the time in the mobile network when the second device sends the fourth message to the access device; the second message is sent by the access device to the first device based on the fourth message; after that, the first device determines the fifth time The timestamp information and the sixth time stamp information. The fifth time stamp information is the time in the Ethernet network when the first device receives the second message, and the sixth time stamp information is the mobile network when the first device receives the second message. Moment; finally, A device determines the seventh time stamp information according to the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, and the sixth time stamp information; the first device passes the seventh time stamp information through the connection The incoming device is forwarded to the second device, where the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

With the above method, the first device determines the seventh time stamp information by using the time stamp information of the message sent and received in the mobile network, so that the second device calculates the first device according to the seventh time stamp information and the time of sending and receiving messages in the Ethernet network. The time deviation from the second device is then synchronized. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, the first device determines the seventh timestamp information according to the second timestamp information, the third timestamp information, the fourth timestamp information, the sixth timestamp information, and the sixth timestamp information. The specific method may be The first device determines the round-trip transmission delay difference between the first device and the second device according to the second time stamp information, the third time stamp information, the fourth time stamp information, and the sixth time stamp information, and then calculates the Sum of the time corresponding to the five timestamp information and the round-trip transmission delay difference value to obtain seventh timestamp information.

Through the above method, the first device can accurately obtain the seventh time stamp information, so that the second device can calculate the time between the first device and the second device according to the seventh time stamp information and the time of sending and receiving packets in the Ethernet network. Deviation, and then time synchronization.

In a possible design, the first device records the second time stamp information locally after determining the second time stamp information, so that the first device subsequently calculates a round-trip transmission delay difference between the first device and the second device. . In this way, the subsequent first device can obtain the seventh timestamp information by using the recorded second timestamp information.

In a possible design, after the first device receives the second message from the access device, it extracts the third time stamp information and the fourth time stamp information carried in the first protocol field included in the second message.

With the above method, the first device may subsequently determine the seventh timestamp information by using the third timestamp information and the fourth timestamp information.

In a possible design, the first protocol field may be an existing protocol field or a protocol field newly added in an existing protocol stack framework. For example, when the first protocol field is an existing protocol field, when the first device is a user plane network element, the first protocol field may be a general packet radio service GPRS tunneling protocol GTP field; when the first device is a terminal device, The first protocol field may be a service data protocol SDAP field or a data aggregation protocol PDCP field. As another example, when the first protocol field is a newly added protocol field, the first protocol field may be a NEW field.

Through the above method, the access device may carry the third time stamp information and the fourth time stamp information through the protocol field in the message, so as to send the third time stamp information and the fourth time stamp information to the first device.

In a possible design, after the first device receives the second message from the access device, it extracts the third time stamp information and the fourth time stamp information carried in the first protocol field included in the second message. The following three situations:

Case 1: The first device extracts the third time stamp information and the fourth time stamp information in the GTP field. In this case, the first device is a user plane network element.

Case 2: The first device extracts the third time stamp information and the fourth time stamp information in the SDAP field or the PDCP field. In this case, the first device is a terminal device.

Case 3: The first device extracts the third time stamp information and the fourth time stamp information in the NEW field. In this case, the first device is a terminal device or a user plane network element.

Through the above method, the first device can accurately obtain the third time stamp information and the fourth time stamp information.

In a second aspect, the present application also provides a synchronization method, which includes:

After the access device receives the first message from the first device, it sends a third message to the second device based on the first message. The first message carries the first time stamp information, and the first time stamp information is the first device. The time in the Ethernet network when sending the first message; the third message carries the first time stamp information; the access device sends the second message to the first device after receiving the fourth message from the second device; the fourth The message carries the third timestamp information and the fourth timestamp information, the third timestamp information is the time in the mobile network when the second device receives the third message, and the fourth timestamp information is the access from the second device to the The moment in the mobile network when the device sends the fourth message; the second message carries the third and fourth timestamp information; the access device receives the seventh timestamp information from the first device and sends it to the second device Send seventh timestamp information; where the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

By the above method, the access device transmits the time stamp information required for clock synchronization for the first device and the second device, so that the clock synchronization is completed.

In a possible design, the access device sends a second message to the first device. The specific method may be: when the access device detects that the second protocol field included in the fourth message carries the third time stamp information and the first time In the case of four timestamp information, the third timestamp information and the fourth timestamp information are encapsulated into the first protocol field included in the fourth message, a second message is generated, and the second message is sent to the first device.

Through the above method, the access device can successfully send the third time stamp information and the fourth time stamp information to the first device, so that the first device determines the seventh time stamp information.

In a possible design, before the access device encapsulates the third time stamp information and the fourth time stamp information into the first protocol field included in the fourth message, the access device extracts the second protocol field included in the fourth message. Carry third time stamp information and fourth time stamp information.

In a possible design, the first protocol field may be an existing protocol field, or may be a newly added protocol field (for example, a NEW field) in an existing protocol stack framework. The second protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a user plane network element, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field, and the first protocol field is a general packet radio service GPRS tunneling protocol GTP field; When the first device is a terminal device, the second protocol field is a GTP field, and the first protocol field is an SDAP field or a PDCP field.

In a third aspect, the present application further provides a synchronization method, which includes:

The second device receives the third message from the access device, and the third message carries the first time stamp information, and the first time stamp information is the time in the Ethernet network when the first device sends the first message; the third message It is sent by the access device based on the first message after receiving the first message from the first device; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and The second device is a user plane network element. Then, the second device determines the third time stamp information and the eighth time stamp information. The third time stamp information is the time in the mobile network when the second device receives the third message. The eight timestamp information is the time in the Ethernet network when the second device receives the third message; the second device sends a fourth message to the access device, and the fourth message carries the third timestamp information and the fourth timestamp Information, the fourth timestamp information is the time in the mobile network when the second device sends the fourth message to the access device; then the second device determines the ninth timestamp information, and the ninth timestamp information is the second device to access Device sends fourth report The time in the text-time Ethernet network; finally, the second device receives the seventh time stamp information from the access device, and determines the first time stamp information based on the first time stamp information, the eighth time stamp information, the ninth time stamp information, and the seventh time stamp information. Time deviation between a device and a second device, and time synchronization is performed according to the time deviation.

Through the above method, the second device calculates a time deviation between the first device and the second device according to the seventh time stamp information and the time of sending and receiving packets in the Ethernet network, and then performs time synchronization. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, the second device determines the time in the Ethernet network when the first device receives the second packet according to the seventh timestamp information, and the second packet is the access device sends the first packet to the first device based on the fourth packet. Sent. In this way, the second device can perform time synchronization according to the seventh time stamp information.

In a possible design, the fourth message carries the third timestamp information and the fourth timestamp information. Specifically, the second device carries the third timestamp information and the fourth timestamp information in the fourth message. In the second agreement field. In this way, the second device can successfully transmit the third time stamp information and the fourth time stamp information to the access device.

In a possible design, the second protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the second device is a user plane network element, the second protocol field is general Packet Radio Service GPRS Tunneling Protocol GTP field.

In a fourth aspect, the present application further provides a synchronization method, which includes:

The first device sends a first message to the access device, and the first message carries the first time stamp information and the second time stamp information, and the first time stamp information is in the Ethernet network when the first device sends the first message. Time, the second time stamp information is the time in the mobile network when the first device sends the first message; then, the first device receives the second message from the access device, and determines the third time stamp information and the fourth time stamp Information, the third time stamp information is the time in the Ethernet network when the first device receives the second message, and the fourth time stamp information is the time in the mobile network when the first device receives the second message; finally, The first device sends the third time stamp information and the fourth time stamp information to the access device, and the first time stamp information, the second time stamp information, the third time stamp information, and the fourth time stamp information are used for time synchronization; The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

Through the above method, the first device sends timestamp information of the message sent and received in the mobile network to the second device, so that the second device sends and receives the time stamp of the message in the mobile network and the timestamp of the message in the Ethernet network. Information to calculate the time deviation between the first device and the second device, and then perform time synchronization. Since the influence of the transmission delay between the first device and the second device can be avoided, it is possible to realize the docking scenario between the mobile network and the Ethernet network, and meet the time accuracy requirements of industrial plants.

In a possible design, the first message carries the second timestamp information, which may specifically be: the first device carries the second timestamp information in a first protocol field included in the first message.

With the above method, the first device can successfully transmit the second time stamp information to the access device, so that the access device subsequently transmits the second time stamp information to the second device.

In a possible design, the first protocol field may be an existing protocol field, or may be a newly added protocol field (for example, a NEW field) in an existing protocol stack framework.

In a possible design, when the first device is a user plane network element, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; when the first device is a terminal device, the first protocol field is a service data protocol In the SDAP field or the data aggregation protocol PDCP field.

In a fifth aspect, the present application further provides a synchronization method, which includes:

After the access device receives the first message from the first device, it sends a third message to the second device based on the first message; the first message carries the first time stamp information and the second time stamp information, and the first time The time stamp information is the time in the Ethernet network when the first device sends the first message, and the second time stamp information is the time in the mobile network when the first device sends the first message; the third message carries the first time stamp information And the second timestamp information; the access device receives a fourth message from the second device and sends a second message to the first device based on the fourth message; the access device receives the third timestamp information from the first device and Fourth timestamp information, the third timestamp information is the time in the Ethernet network when the first device receives the second message, and the fourth timestamp information is the time in the mobile network when the first device receives the second message Time; the access device sends the third time stamp information and the fourth time stamp information to the second device, the first time stamp information, the second time stamp information, the third time stamp information, and the fourth time stamp information are used for time synchronization ; Where the first device is User plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the access device sends a third packet to the second device based on the first packet. The specific method may be: when the access device detects that the first protocol field included in the first packet includes the second packet, In the time stamp information, the access device encapsulates the second time stamp information into a second protocol field included in the first message, generates a third message, and sends the third message to the second device.

Through the above method, the access device can successfully send the second time stamp information to the second device, so that the second device performs clock synchronization.

In a possible design, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field, and the second protocol field is a Service Data Protocol SDAP field Or data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the first protocol field is an SDAP field or a PDCP field, and the second protocol field is a GTP field.

In a sixth aspect, the present application further provides a synchronization method, which includes:

The second device receives a third message from the access device, and the third message carries the first timestamp information and the second timestamp information, and the first timestamp information is in the Ethernet network when the first device sends the first message. Time; the second time stamp information is the time in the mobile network when the first device sends the first message; the third message is sent based on the first message after the access device receives the first message from the first device; The second device determines the fifth time stamp information and the sixth time stamp information. The fifth time stamp information is the time in the Ethernet network when the second device receives the third packet, and the sixth time stamp information is the second device received the Three messages are the time in the mobile network; the second device sends a fourth message to the access device, and determines the seventh time stamp information and the eighth time stamp information, and the seventh time stamp information is the second device to the access device The time in the Ethernet network when the fourth message is sent, and the eighth time stamp information is the time in the mobile network when the second device sends the fourth message to the access device; the second device receives the third time stamp information from the access device And fourth timestamp Information, the third timestamp information is the time in the Ethernet network when the first device receives the second message, and the fourth timestamp information is the time in the mobile network when the first device receives the second message; the second The message is sent by the access device to the first device based on the fourth message; the second device is based on the first timestamp information, the second timestamp information, the sixth timestamp information, the eighth timestamp information, and the third timestamp. The information, the fourth time stamp information, the fifth time stamp information, and the seventh time stamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation. The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

By the above method, the second device calculates a time deviation between the first device and the second device by using time stamp information of the message transmitted and received in the mobile network and time stamp information of the message transmitted and received in the Ethernet network, and then performs time synchronization. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, the second device is based on the first time stamp information, the second time stamp information, the sixth time stamp information, the eighth time stamp information, the third time stamp information, the fourth time stamp information, and the fifth time. The stamp information and the seventh timestamp information determine the time deviation between the first device and the second device. The specific method may be: the second device according to the second timestamp information, the sixth timestamp information, the eighth timestamp information, and the first The four timestamp information determines a round-trip transmission delay difference between the first device and the second device; the second device uses the first timestamp information, the third timestamp information, the fifth timestamp information, the seventh timestamp information, and The round-trip transmission delay difference determines a time offset between the first device and the second device.

Through the above method, the second device can determine a time deviation between the first device and the second device by determining a round-trip transmission delay difference between the first device and the second device.

In a possible design, the second device determines the first device and the second device according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, and the round-trip transmission delay difference value. The specific method may be: the second device determines the ninth time stamp information, and the ninth time stamp information is a sum of a time corresponding to the third time stamp information and a round-trip transmission delay difference; and then the second device A timestamp information, a fifth timestamp information, a seventh timestamp information and a ninth timestamp information determine the time deviation between the first device and the second device.

Through the above method, the second device can accurately determine a time offset between the first device and the second device, so that the second device performs time synchronization according to the time offset.

In a possible design, after the second device receives the third message from the access device, the second device extracts the second time stamp information carried in the second protocol field included in the third message.

In a possible design, when the second protocol field is an existing protocol field, when the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the second device is When the user plane network element is used, the second protocol field is the GTP field of the general packet radio service GPRS tunneling protocol.

In a seventh aspect, the present application further provides a synchronization method, which includes:

The first device sends a first message to the access device, and the first message carries the first time stamp information and the second time stamp information, and the first time stamp information is in the Ethernet network when the first device sends the first message. Time, the second time stamp information is the time in the mobile network when the first device sends the first message; then, the first device sends a second message to the access device, and the second message carries the third time stamp information and Fourth timestamp information, the third timestamp information is the time in the Ethernet network when the first device sends the second message, and the fourth timestamp information is the time in the mobile network when the first device sends the second message; The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

By the above method, the first device sends a message to the second device, so that the mobile device and the Ethernet clock message receive and send time when the second device transmits the message initiated by the first device, and calculates the time between the first device and the second device. Frequency deviation, and then frequency synchronization. Since the influence of the transmission delay between the first device and the second device can be avoided, it is possible to realize the docking scenario of the mobile network and the Ethernet network, and meet the clock accuracy requirements of industrial factories.

In a possible design, when the first device is a user plane network element, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; when the first device is a terminal device, the first protocol field is a service data protocol SDAP field or data aggregation protocol PDCP field.

In a possible design, the second message carries the fourth timestamp information. Specifically, the first device may carry the fourth timestamp information in a second protocol field included in the second message.

Through the above method, the first device can successfully transmit the fourth timestamp information to the access device, so that the access device can subsequently transmit the information to the second device.

In a possible design, when the first device is a user plane network element, the second protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; when the first device is a terminal device, the second protocol field is a service data protocol SDAP field or data aggregation protocol PDCP field.

In an eighth aspect, the present application further provides a synchronization method, which includes:

The access device receives the first message from the first device, and sends a third message to the second device based on the first message; the first message carries the first time stamp information and the second time stamp information, and the first time stamp The information is the time in the Ethernet network when the first device sends the first message, and the second time stamp information is the time in the mobile network when the first device sends the first message; the third message carries the first time stamp information and The second time stamp information; then, the access device receives the second message from the first device, and sends a fourth message to the second device based on the second message, and the second message carries the third time stamp information and the first time message. Four timestamp information, the third timestamp information is the time in the Ethernet network when the first device sends the second message, and the fourth timestamp information is the time in the mobile network when the first device sends the second message; the fourth report The text carries third time stamp information and fourth time stamp information; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element .

In a possible design, the access device sends a third packet to the second device based on the first packet. The specific method may be: when the access device detects that the first protocol field included in the first packet includes the second packet, In timestamp information, the access device encapsulates the second timestamp information into a third protocol field included in the first message, generates a third message, and sends the third message to the second device.

In a possible design, before the access device encapsulates the second time stamp information into a third protocol field included in the first packet, the access device extracts the second packet included in the first protocol field included in the first packet. Timestamp information.

In a possible design, the first protocol field may be an existing protocol field, or may be a newly added protocol field (for example, a NEW field) in an existing protocol stack framework. The third protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field, and the third protocol field is a service data protocol SDAP field Or data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the first protocol field is an SDAP field or a PDCP field, and the third protocol field is a GTP field.

In a possible design, the access device sends a fourth message to the second device based on the second message. The specific method may be: when the access device detects that the second protocol field included in the second message includes a fourth message, In timestamp information, the access device encapsulates the fourth timestamp information into the fourth protocol field of the second message, generates a fourth message, and sends the fourth message to the second device.

Through the above method, the access device can successfully send the fourth time stamp information to the second device, so that the second device performs clock synchronization.

In a possible design, before the access device encapsulates the fourth time stamp information into a fourth protocol field included in the second packet, the access device extracts the second packet included in the second protocol field included in the second packet. Timestamp information.

In a possible design, the fourth protocol field may be an existing protocol field, or a protocol field (for example, a NEW field) newly added in an existing protocol stack framework. The second protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a user plane network element and the second device is a terminal device, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field, and the fourth protocol field is a service data protocol SDAP field Or data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the second protocol field is an SDAP field or a PDCP field, and the fourth protocol field is a GTP field.

In a ninth aspect, the present application further provides a synchronization method, which includes:

The second device receives a third message from the access device, and the third message carries the first time stamp information and the second time stamp information, and the first time stamp information is when the first device sends the first message to the access device. The time in the Ethernet network, the second time stamp information is the time in the mobile network when the first device sends the first message to the access device; the third message is the time that the access device sends to the second device based on the first message of;

The second device determines the fifth time stamp information and the sixth time stamp information. The fifth time stamp information is the time in the Ethernet network when the second device receives the third packet, and the sixth time stamp information is the second device received the Three messages are the time in the mobile network; the second device receives the fourth message from the access device, and the fourth message carries the third time stamp information and the fourth time stamp information, and the third time stamp information is the first device The time in the Ethernet network when sending the second message to the access device, and the fourth time stamp information is the time in the mobile network when the first device sends the second message to the access device; the fourth message is the access device Sent to the second device based on the second message; the second device determines the seventh time stamp information and the eighth time stamp information, and the seventh time stamp information is the time in the Ethernet network when the second device receives the fourth message, The eighth timestamp information is the time in the mobile network when the second device receives the fourth message; according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, Fifth time The stamp information, the sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a frequency deviation between the first device and the second device, and perform frequency synchronization according to the frequency deviation. The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

By the above method, the second device uses the message transmission and reception time in the mobile network and the Ethernet network to transmit the message initiated by the first device, calculates the frequency deviation between the first device and the second device, and then performs frequency synchronization. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the clock accuracy requirements of industrial plants.

In a possible design, the second device is based on the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, the sixth time stamp information, and the seventh time. The stamp information and the eighth timestamp information determine the frequency deviation between the first device and the second device. The specific method may be as follows: the second device determines the first and second timestamp information corresponding to the second time stamp information. A difference, and a second difference that determines the time corresponding to the eighth time stamp information and the time corresponding to the fourth time stamp information; the second device according to the first time stamp information, the third time stamp information, and the fifth time stamp information The seventh time stamp information, the first difference value and the second difference value determine a frequency deviation between the first device and the second device.

Through the above method, the second device can accurately determine the frequency deviation between the first device and the second device.

In a possible design, the second device determines the first device and the first device according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, the first difference value, and the second difference value. The frequency deviation between the two devices, the specific method can be:

The second device determines a magnitude relationship between the first difference and the second difference;

When the second device determines that the second difference is smaller than the first difference, the second device determines that the frequency deviation is a quotient of the first value and the second value, and the first value is a time corresponding to the third time stamp information and the first time stamp The difference between the times corresponding to the information. The second value is a value obtained by adding the third value to the difference between the time corresponding to the seventh timestamp information and the time corresponding to the fifth timestamp information. The third value is the fourth value and the third value. The product of five values. The fourth value is the value obtained by subtracting the second difference from the first difference. The fifth value is the difference between the time corresponding to the seventh timestamp information and the time corresponding to the fifth timestamp. The value obtained by the difference between the time corresponding to the eight timestamp information and the time corresponding to the sixth timestamp;

When the second device determines that the second difference is greater than the first difference, the second device determines that the frequency deviation is a quotient of the first value and a sixth value, and the sixth value is a time corresponding to the seventh time stamp information and a fifth time stamp The value obtained by subtracting the seventh value from the difference at the time corresponding to the information, the seventh value is the product of the eighth value and the fifth value, and the eighth value is the value obtained by subtracting the first difference from the second difference.

Through the above method, the second device can perform frequency synchronization by accurately determining a frequency deviation between the first device and the second device.

In a tenth aspect, the present application further provides a synchronization method, which includes:

After the first device determines the first timestamp information, it sends a first message to the access device, and the first message carries the first timestamp information; the first timestamp information is the time corresponding to the second timestamp information and the third time The difference in time corresponding to the timestamp information, the second timestamp information is the master clock information in the Ethernet network, and the third timestamp information is the master clock information in the mobile network; wherein the first device is a user plane network element and the first The two devices are terminal devices, or the first device is a terminal device and the second device is a user plane network element.

Through the above method, the first device determines a difference between the master clock information in the mobile network and the Ethernet network, and sends it to the second device, so that the second device directly completes clock synchronization through the difference in the master clock information. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, the first message carries the first timestamp information. Specifically, the first device may carry the first timestamp information in a first protocol field included in the first message.

Through the above method, the first device can successfully transmit the first time stamp information to the access device, so that the access device can subsequently transmit the information to the second device.

In a possible design, the first device receives a second message from the access device, and the second message is used to notify the first device that time synchronization has been completed.

Through the above method, the first device can end the transmission of the message after the third message in the existing synchronization process by recognizing that the time synchronization is completed, thereby saving resource consumption.

In an eleventh aspect, the present application further provides a synchronization method, which includes:

The access device receives the first message from the first device and sends a third message to the second device based on the first message. The first message carries the first time stamp information, and the first time stamp information is the second time. The difference between the time corresponding to the timestamp information and the time corresponding to the third time stamp information, the second time stamp information is the master clock information in the Ethernet network, and the third time stamp information is the master clock information in the mobile network; the third message The first timestamp information is carried therein, where the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the access device sends a third packet to the second device based on the first packet. The specific method may be: when the access device detects that the first protocol field included in the first packet includes the first packet, In timestamp information, the access device encapsulates the first timestamp information into a second protocol field included in the first message, generates a third message, and sends the third message to the second device.

Through the above method, the access device can successfully send the first time stamp information to the second device, so that the second device performs clock synchronization.

In a possible design, before the access device encapsulates the first time stamp information into the second protocol field included in the first packet, the access device extracts the second packet included in the first protocol field included in the first packet. Timestamp information.

In a possible design, the access device receives the second message from the second device, and forwards the second message to the first device, and the second message is used to notify the first device that time synchronization has been completed.

By using the above method, the first device can end transmission of the message after the third message in the existing synchronization process by recognizing that the time synchronization has been completed, thereby saving resource consumption.

In a twelfth aspect, the present application further provides a synchronization method, which includes:

The second device receives a third message from the access device, and the third message carries the first time stamp information, and the first time stamp information is a difference between the time corresponding to the second time stamp information and the time corresponding to the third time stamp information. Value, the second time stamp information is the master clock information in the Ethernet network, the third time stamp information is the master clock information in the mobile network; the third message is the first message sent by the access device based on the first message Sent by the first device to the access device; wherein the first device is a user plane network element and the second device is a terminal device; or, the first device is a terminal device and the second device is a user plane network element; The two devices determine the fourth time stamp information, and use the time corresponding to the fourth time stamp information and the difference corresponding to the first time stamp information to complete the time synchronization; the fourth time stamp information is when the second device receives the third message Moments in mobile networks.

Through the above method, the second device directly completes clock synchronization through the difference between the master clock information. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, after the second device receives the third message from the access device, the second device extracts the first time stamp information carried in the second protocol field included in the third message.

In a possible design, the second device sends a second message to the access device, and the second message is used to notify the first device that time synchronization has been completed.

Through the above method, the subsequent access device forwards the second message to the first device, so that the first device can end the transmission of the message after the third message in the existing synchronization process by recognizing that the time synchronization is completed, This can save resource consumption.

In a thirteenth aspect, the present application further provides a first device having the functions of implementing the first device in the method examples of the first aspect, the fourth aspect, the seventh aspect, or the tenth aspect described above. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the first device includes a sending unit, a processing unit, and a receiving unit, and these units may perform corresponding functions in the method examples of the first aspect, the fourth aspect, the seventh aspect, or the tenth aspect, For details, refer to the detailed description in the method example, which is not described here.

In a possible design, the structure of the first device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the first device. Corresponding functions in the above-mentioned first, fourth, seventh or tenth methods. The memory is coupled to the processor and stores program instructions and data necessary for the first device.

In a fourteenth aspect, the present application further provides an access device that has the functions of implementing the access device in the second, fifth, eighth, or eleventh method examples. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the access device includes a sending unit and a receiving unit, and these units may perform corresponding functions in the method examples of the second aspect, the fifth aspect, the eighth aspect, or the eleventh aspect described above. For details, see The detailed description in the method example will not be repeated here.

In a possible design, the structure of the access device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the access device. Corresponding functions in the above-mentioned second, fifth, eighth or eleventh methods. The memory is coupled to the processor and stores program instructions and data necessary for accessing the device.

In a fifteenth aspect, the present application further provides a second device, which has the function of implementing the second device in the third, sixth, ninth, or twelfth method examples. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the second device includes a receiving unit, a processing unit, and a sending unit, and these units may perform corresponding functions in the method examples of the third aspect, the sixth aspect, the ninth aspect, or the twelfth aspect described above. For details, refer to the detailed description in the method example, which will not be repeated here.

In a possible design, the structure of the second device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the second device. Corresponding functions in the methods of the third, sixth, ninth or twelfth aspects. The memory is coupled to the processor and stores program instructions and data necessary for the second device.

In a sixteenth aspect, the present application further provides a communication system, and the communication system may include the first device, the access device, and the second device mentioned in the above design.

In a seventeenth aspect, the present application also provides a computer storage medium. The computer storage medium stores computer-executable instructions. When the computer-executable instructions are called by a computer, the computer executes any one of the foregoing methods.

In an eighteenth aspect, the present application also provides a computer program product containing instructions that, when run on a computer, causes the computer to execute any one of the methods described above.

In a nineteenth aspect, the present application further provides a chip, which is connected to the memory, and is configured to read and execute program instructions stored in the memory to implement any of the foregoing methods.

In a twentieth aspect, the present application further provides a synchronization method, which includes:

First, after the first device receives the first message from the third device, the first device determines the first time stamp information, and sends the first message to the second device through the access device. The first time stamp information is that the first device receives the first time stamp information. One message is the time in the mobile network; then, after receiving the second message from the third device, the first device sends a third message to the access device based on the second message, and the third message carries the first time After stamping the information; after receiving the fourth message from the access device, the first device sends a fourth message to the third device, and determines the second time stamp information, the second time stamp information is the first device to the third device The moment in the mobile network when the fourth message is sent; after receiving the fifth message from the third device, the first device determines the third time stamp information, and sends a sixth message to the access device based on the fifth message. The six messages carry the second time stamp information, and the third time stamp information is the time in the mobile network when the first device receives the fifth message; finally, after receiving the seventh message from the third device, the first device sends the The access device sends an eighth message; a seventh message Carry fourth time stamp information, the fourth time stamp information is the time in the Ethernet network when the third device sends the fifth message to the first device, and the eighth message carries the third time stamp information and the fourth time stamp information; The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

By using the above method, the influence of transmission delay between the first device and the second device can be avoided, so that the docking scenario between the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of industrial plants.

In a possible design, the third message carries the first timestamp information, which may be: the first device carries the first timestamp information in a first protocol field included in the third message. In this way, the first time stamp information can be successfully transmitted to the access device.

In a possible design, when the first device is a terminal device, the first protocol field is an SDAP field or a PDCP field; or when the first device is a user plane network element, the first protocol field is a GTP field.

In a possible design, the sixth message carries the second timestamp information, which may be: the first device carries the second timestamp information in a second protocol field included in the sixth message. In this way, the second time stamp information can be successfully transmitted to the access device.

In a possible design, when the first device is a terminal device, the second protocol field is an SDAP field or a PDCP field; or when the second device is a user plane network element, the second protocol field is a GTP field.

In a possible design, the third timestamp information is carried in the eighth message, which may be: the first device carries the third timestamp information in a third protocol field included in the eighth message. In this way, the third time stamp information can be successfully transmitted to the access device.

In a possible design, the third protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a terminal device, the third protocol field is an SDAP field or a PDCP field; or when the second device is a user plane network element, the third protocol field is a GTP field.

In a twenty-first aspect, the present application further provides a synchronization method, which includes:

After receiving the first message from the first device, the access device forwards the first message to the second device; after receiving the third message from the first device, the access device sends a ninth to the second device based on the third message. Message; the third message carries the first time stamp information, the ninth message carries the first time stamp information, and the first time stamp information is in the mobile network when the first device receives the first message from the third device At the moment; after receiving the fourth message from the second device, the access device sends a fourth message to the first device; after receiving the sixth message from the first device, the access device sends the fourth message to the second device based on the sixth message. The device sends a tenth message; the sixth message is sent by the first device to the access device based on the fifth message after receiving the fifth message from the third device; the sixth message carries the second time stamp information, The second time stamp information is the time in the mobile network when the first device sends the fourth message to the third device after receiving the fourth message from the access device; the tenth message carries the second time stamp information; access The device receives the eighth message from the first device, and sends the eighth message to the second device based on the eighth message. Send the eleventh message; the eighth message carries the third time stamp information and the fourth time stamp information, and the third time stamp information is the time in the mobile network when the first device receives the fifth message from the third device The fourth timestamp information is the time in the Ethernet network when the third device sends the fifth message to the first device; the eleventh message carries the third timestamp information and the fourth timestamp information; wherein the first device Is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the access device sends a ninth message to the second device based on the third message, which may specifically be: when the access device detects that the first protocol field included in the third message carries the first time When stamping the information, the first time stamp information is encapsulated into the fourth protocol field of the third message, a ninth message is generated, and the ninth message is sent to the second device. In this way, the access device can transmit the first time stamp information to the second device.

In a possible design, the first protocol field may be an existing protocol field, or may be a newly added protocol field (for example, a NEW field) in an existing protocol stack framework. The fourth protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in an existing protocol stack framework.

In a possible design, when the first device is a terminal device, the first protocol field is an SDAP field or a PDCP field, and the fourth protocol field is a GTP field; or, when the first device is a user plane network element, the first The protocol field is a GTP field, and the fourth protocol field is an SDAP field or a PDCP field.

In a possible design, the access device sends the tenth message to the second device based on the sixth message, which may be: when the access device detects that the second protocol field included in the sixth message carries a second timestamp For information, the second time stamp information is encapsulated into the fifth protocol field of the sixth message, a tenth message is generated, and the tenth message is sent to the second device. In this way, the access device can transmit the second time stamp information to the second device.

In a possible design, the second protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework. The fifth protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a terminal device, the second protocol field is an SDAP field or a PDCP field, and the fifth protocol field is a GTP field; or, when the first device is a user plane network element, the second The protocol field is a GTP field, and the fifth protocol field is an SDAP field or a PDCP field.

In a possible design, the access device sends an eleventh message to the second device based on the eighth message, which may be: when the access device detects that the third protocol field included in the eighth message carries a third time When stamping the information, the third time stamp information is encapsulated into the sixth protocol field of the eighth message, an eleventh message is generated, and the eleventh message is sent to the second device. In this way, the access device can transmit the third time stamp information to the second device.

In a possible design, the third protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework. The sixth protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the first device is a terminal device, the third protocol field is an SDAP field or a PDCP field, and the sixth protocol field is a GTP field; or when the first device is a user plane network element, the third The protocol field is a GTP field, and the sixth protocol field is an SDAP field or a PDCP field.

In a twenty-second aspect, the present application also provides a synchronization method, which includes:

First, after receiving the first message from the access device, the second device sends the first message to the fourth device and determines the fifth time stamp information. The fifth time stamp information is the second device sending the first message to the fourth device. The message is the time in the mobile network; then, after the second device receives the ninth message from the access device, it sends a twelfth message to the fourth device based on the ninth message; the ninth message carries the first time The time stamp information, the first time stamp information is the time in the mobile network when the first device receives the first message from the third device; the second device receives the fourth message from the fourth device, determines the sixth time stamp information, and The fourth message is sent to the access device, and the sixth time stamp information is the time in the mobile network when the second device receives the fourth message; the second device receives the tenth message from the access device; the tenth message Carry the second time stamp information, the second time stamp information is the time in the mobile network when the first device sends the fourth message to the third device after the access device sends the fourth message to the first device; the second device Send a thirteenth message to the fourth device, and confirm The seventh time stamp information; the seventh time stamp information is the time in the mobile network when the second device sends the thirteenth message to the fourth device; the second device receives the eleventh message from the access device, the eleventh The message carries the third time stamp information and the fourth time stamp information. The third time stamp information is the time in the mobile network when the first device receives the fifth message from the third device, and the fourth time stamp information is the third time information. The time in the Ethernet network when the device sends the fifth message to the first device; finally, the second device according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time The stamp information, the sixth timestamp information, and the seventh timestamp information determine the eighth timestamp information; the second device sends the eighth timestamp information to the fourth device, so that the fourth device performs time based on the eighth timestamp information Synchronize.

In a possible design, after the second device receives the ninth message from the access device, it extracts the first time stamp information carried in the fourth protocol field included in the ninth message. In this way, the second device may subsequently determine the eighth time stamp information by using the first time stamp information.

In a possible design, the fourth protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the second device is a user plane network element, the fourth protocol field is a GTP field; or when the second device is a terminal device, the fourth protocol field is an SDAP field or a PDCP field.

In a possible design, after the second device receives the tenth message from the access device, it extracts the second time stamp information carried in the fifth protocol field included in the tenth message. In this way, the second device may subsequently determine the eighth timestamp information by using the second timestamp information.

In a possible design, the fifth protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the second device is a user plane network element, the fifth protocol field is a GTP field; or when the second device is a terminal device, the fifth protocol field is an SDAP field or a PDCP field.

In a possible design, after receiving the eleventh message from the access device, the second device extracts the third time stamp information carried in the sixth protocol field included in the eleventh message. In this way, the second device can subsequently determine the eighth time stamp information by using the third time stamp information.

In a possible design, the sixth protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework.

In a possible design, when the second device is a user plane network element, the sixth protocol field is a GTP field; or when the second device is a terminal device, the sixth protocol field is an SDAP field or a PDCP field.

In a twenty-third aspect, the present application further provides a synchronization method, which includes:

First, the first device sends a first message to the access device, and determines first time stamp information and second time stamp information; the first time stamp information is a time in the Ethernet network when the first device sends the first message, The second time stamp information is the time in the mobile network when the first device sends the first message; the first device sends a second message to the access device, and the second message carries the first time stamp information and the second time stamp Information; then, the first device receives the third message from the access device and determines the third time stamp information, the third time stamp information is the time in the Ethernet network when the first device receives the third message; the first device Send a fourth message to the access device and determine the fourth time stamp information; the fourth time stamp information is the time in the Ethernet network when the first device sends the fourth message, and the fourth message carries the third time stamp information ; Finally, the first device sends a fifth message to the access device, and the fifth message carries the fourth time stamp information; wherein the first device is a user plane network element and the second device is a terminal device; or The device is an end device and The second device is a user plane network element.

In a possible design, the second message carries the second timestamp information, which may specifically be: the first device carries the second timestamp information in a first protocol field included in the second message. In this way, the first device can successfully transmit the second time stamp information to the access device.

In a possible design, the first protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in an existing protocol stack framework.

In a twenty-fourth aspect, the present application also provides a synchronization method, which includes:

After receiving the first message from the first device, the access device forwards the first message to the second device; after receiving the second message from the first device, the access device sends a sixth message to the second device based on the second message. Message; the second message carries the first time stamp information and the second time stamp information, the first time stamp information is the time in the Ethernet network when the first device sends the first message to the access device, and the second time stamp The information is the time in the mobile network when the first device sends the first message to the access device; the sixth message carries the first and second timestamp information; the access device receives the third message from the second device After the text, the third message is forwarded to the first device; after receiving the fourth message from the first device, the access device forwards the fourth message to the second device, and the fourth message carries the third time stamp information. The three timestamp information is the time in the Ethernet network when the first device receives the third message sent by the access device; after receiving the fifth message from the first device, the access device forwards the fifth message to the second device. , The fifth message carries the fourth time stamp information, the fourth time The stamp information is the time in the Ethernet network when the first device sends the fourth message to the access device; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the The second device is a user plane network element.

In a possible design, the access device sends a sixth message to the second device based on the second message, which may be: when the access device detects that the first protocol field included in the second message carries a second timestamp For information, the second time stamp information is encapsulated into the second protocol field of the second message, a sixth message is generated, and the sixth message is sent to the second device.

In a possible design, when the first device is a terminal device, the first protocol field is an SDAP field or a PDCP field, and the second protocol field is a GTP field; or, when the first device is a user plane network element, the first The protocol field is a GTP field, and the second protocol field is an SDAP field or a PDCP field.

In a twenty-fifth aspect, the present application further provides a synchronization method, which includes:

The second device receives the first message from the access device and determines the fifth time stamp information and the sixth time stamp information. The fifth time stamp information is the time in the Ethernet network when the second device receives the first message. The six timestamp information is the time in the mobile network when the second device receives the first message; the second device receives the sixth message from the access device, and the sixth message carries the first timestamp information and the second timestamp Information; the first time stamp information is the time in the Ethernet network when the first device sends the first message to the access device, and the second time stamp information is the time in the mobile network when the first device sends the first message to the access device. Time; the second device sends a third message to the access device, and determines the seventh time stamp information, the seventh time stamp information is the time in the Ethernet network when the second device sends the third message; the second device slave access The device receives the fourth message and determines the eighth time stamp information. The eighth time stamp information is the time in the Ethernet network when the second device receives the fourth message. The fourth message carries the third time stamp information. Three timestamp information is After the incoming device receives the third message from the second device and forwards the third message to the first device, the time in the Ethernet network when the first device receives the third message; the second device receives the fifth message from the access device. Message, the fifth message carries fourth timestamp information, and the fourth timestamp information is the time in the Ethernet network when the first device sends the fourth message to the access device; according to the first timestamp information, The second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, the sixth timestamp information, the seventh timestamp information, and the eighth timestamp information determine whether the first device and the second device Time, and time synchronization is performed according to the time deviation; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

In a possible design, the second device is based on the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, the sixth time stamp information, and the seventh time. The stamp information and the eighth timestamp information determine the time deviation between the first device and the second device, which may specifically be: the second device according to the second timestamp information, the third timestamp information, the sixth timestamp information, the seventh The timestamp information and the eighth timestamp information determine the ninth timestamp information; the second device deletes the fourth timestamp information, and determines according to the ninth timestamp information that the first device sends the fourth message to the access device in the Ethernet network. Time; the second device determines the first device and the second device according to the first timestamp information, the third timestamp information, the fifth timestamp information, the seventh timestamp information, the eighth timestamp information, and the ninth timestamp information Time deviation between.

Through the above method, the second device can accurately determine the time deviation between the first device and the second device.

In a possible design, after the second device receives the sixth message from the access device, it extracts the second time stamp information carried in the second protocol field included in the sixth message.

In a possible design, when the second device is a user plane network element, the second protocol field is a GTP field; or when the second device is a terminal device, the second protocol field is an SDAP field or a PDCP field.

In a twenty-sixth aspect, the present application also provides a synchronization method, which includes:

First, after receiving the first message from the third device, the first device sends the first message to the second device through the access device, and determines the first time stamp information. The first time stamp information is A message is the time in the mobile network; then, after receiving the second message from the access device, the first device sends a third message to the third device; the second message carries the second time stamp information and the third Timestamp information, the second timestamp information is the time in the mobile network when the second device receives the first message and sends the first message to the fourth device; the third timestamp information is the second device from the fourth device The time in the mobile network when the fifth message is received; the first device determines the fourth time stamp information, the fourth time stamp information is the time in the mobile network when the first device sends the third message; after that, the first device The third device receives the sixth message, and the sixth message carries fifth time stamp information, and the fifth time stamp information is a time in the Ethernet network when the third device receives the third message sent by the first device; finally, First device according to the first time Determining the sixth timestamp information by the stamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth timestamp information, and forwarding the sixth timestamp information to the second device through the access device; The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the first device determines the sixth timestamp information according to the first timestamp information, the second timestamp information, the fourth timestamp information, and the fifth timestamp information, which may specifically be The first device determines a round-trip transmission delay difference between the first device and the second device according to the first time stamp information, the second time stamp information, the third time stamp information, and the fourth time stamp information; the first device calculates Sum of the time corresponding to the fifth timestamp information and the round-trip transmission delay difference value to obtain sixth timestamp information.

Through the above method, the first device can accurately determine the sixth time stamp information, so that the fourth device can calculate the time deviation between the third device and the fourth device according to the sixth time stamp information and the time of sending and receiving packets in the Ethernet network. , And then time synchronization.

In a possible design, after receiving the second message from the access device, the first device extracts the second time stamp information and the third time stamp information carried in the first protocol field included in the second message. In this way, the first device can transmit the second time stamp information and the third time stamp information to the access device.

In a possible design, when the first device is a user plane network element, the first protocol field is a GTP field; or when the first device is a terminal device, the first protocol field is an SDAP field or a PDCP field.

In a twenty-seventh aspect, the present application further provides a synchronization method, which includes:

First, after the access device receives the first message from the first device, it sends the first message to the second device; then, the access device receives the fourth message from the second device, and the fourth message carries the second time The timestamp information and the third time stamp information; the second time stamp information is the time in the mobile network when the first device sends the first message to the fourth device after receiving the first message; the fourth message is the second device After receiving the fifth message from the fourth device, it is sent to the access device based on the fifth message; the third time stamp information is the time in the mobile network when the second device receives the fifth message; after that, access The device sends a second message to the first device, and the second message carries the second time stamp information and the third time stamp information. Finally, the access device receives the sixth time stamp information from the first device, and sends the sixth time stamp information to the second device. Send sixth timestamp information; where the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the access device sends the second message to the first device, which may be: when the access device detects that the second protocol field included in the fourth message carries the second time stamp information and the third time When stamping the information, the second time stamp information and the third time stamp information are encapsulated into a first protocol field included in the fourth message, a second message is generated, and a second message is sent to the first device. In this way, the access device can transmit the second time stamp information and the third time stamp information to the second device.

In a possible design, the second protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in the existing protocol stack framework. The first protocol field may also be an existing protocol field, or may be a protocol field (for example, a NEW field) newly added in an existing protocol stack framework.

In a possible design, when the first device is a user plane network element, the second protocol field is an SDAP field or a PDCP field, and the first protocol field is a GTP field; or, when the first device is a terminal device, the second The protocol field is a GTP field, and the first protocol field is an SDAP field or a PDCP field.

In a twenty-eighth aspect, the present application further provides a synchronization method, which includes:

First, after the second device receives the first message from the access device, it sends the first message to the fourth device, and determines the second time stamp information. The second time stamp information moves when the second device sends the first message. The time in the network; then, the second device receives the fifth message from the fourth device and determines the third time stamp information, the third time stamp information is the time in the mobile network when the second device receives the fifth message; After that, the second device sends a fourth message to the access device, and the fourth message carries the second time stamp information and the third time stamp information; finally, the second device receives the sixth time stamp information from the access device, and Send sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information.

In a possible design, the fourth message carries the second time stamp information and the third time stamp information, which may be: the second device carrying the second time stamp information and the third time stamp information in the fourth message includes In the second agreement field. In this way, the second device can transmit the second time stamp information and the third time stamp information to the access device.

In a possible design, when the second device is a terminal device, the second protocol field is an SDAP field or a PDCP field; or when the second device is a user plane network element, the second protocol field is a GTP field.

In a twenty-ninth aspect, the present application further provides a synchronization method, which includes:

First, the first device receives a first message from a third device, and determines first time stamp information, where the first time stamp information is a time in the mobile network when the first device receives the first message; then, the first device A second message is sent to the access device based on the first message, and the second message carries the first timestamp information; after that, the first device sends a third message to the third device after receiving the third message from the access device Message, and determine the second time stamp information, the second time stamp information is the time in the mobile network when the first device sends the third message; finally, the first device receives the fourth message from the third device, the fourth message The text carries third time stamp information, and the third time stamp information is the time in the Ethernet network when the third device receives the third message sent by the first device; the first device combines the second time stamp information and the third time stamp The information is sent to the access device; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the second message carries the first timestamp information, which may be: the first device carries the first timestamp information in a first protocol field included in the second message. In this way, the first device can successfully transmit the first time stamp information to the access device.

In a thirtieth aspect, the present application further provides a synchronization method, which includes:

First, the access device receives a second message from the first device, the second message carries the first time stamp information, and the second message is the first device sends the first message to the access device after receiving the first message from the third device The first time stamp information sent is the time in the mobile network when the first device receives the first message; then, the access device sends a fifth message to the second device based on the second message. Carry the first time stamp information; after that, the access device sends the third message to the first device after receiving the third message from the second device; finally, the access device receives the second time stamp information and the first time information from the first device Three timestamp information, and sends a second timestamp information and a third timestamp information to the second device, the second timestamp information is when the first device receives the third message and moves to the third device when sending the third message The time in the network; the third time stamp information is the time in the Ethernet network when the third device receives the third message sent by the first device; wherein the first device is a user plane network element and the second device is a terminal device, Or, the first device is a terminal device And the second device is a user plane network element.

In a possible design, the access device sends a fifth message to the second device based on the second message, which may specifically be: when the access device detects that the first protocol field included in the second message includes the first time When stamping the information, the access device encapsulates the first time stamp information into a second protocol field included in the second message, generates a fifth message, and sends the fifth message to the second device. In this way, the access device can successfully transmit the first time stamp information to the second device.

In a possible design, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a GTP field, and the second protocol field is an SDAP field or a PDCP field; or, when the first device is a When the second device is a user plane network element, the first protocol field is an SDAP field or a PDCP field, and the second protocol field is a GTP field.

In a thirty-first aspect, the present application further provides a synchronization method, which includes:

First, the second device receives a fifth message from the access device, and the fifth message carries the first time stamp information; the first time stamp information is in the mobile network when the first device receives the first message from the third device. The second device sends a sixth message to the fourth device and determines the fourth time stamp information, the fourth time stamp information is the time in the mobile network when the second device sends the sixth message; then, the second device Receiving the third message from the fourth device, determining the fifth time stamp information, and sending the third message to the access device; the fifth time stamp information is the time in the mobile network when the second device receives the third message; After that, the second device receives the second time stamp information and the third time stamp information from the access device; the second time stamp information is that after the access device receives the third message and sends the third message to the first device, The time in the mobile network when a device sends a third message to a third device; the third time stamp information is the time in the Ethernet network when the third device receives the third message sent by the first device; finally, the second device According to the first timestamp letter , The second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth timestamp information determine the sixth timestamp information, and send the sixth timestamp information to the fourth device, so that the fourth device is based on the first Six timestamp information is time synchronized; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In a possible design, the second device determines the sixth timestamp information according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth timestamp information, which may specifically be The second device determines a round-trip transmission delay difference between the first device and the second device according to the first time stamp information, the second time stamp information, the fourth time stamp information, and the fifth time stamp information; the second device calculates Sum of the time corresponding to the third timestamp information and the round-trip transmission delay difference value to obtain sixth timestamp information.

Through the above method, the second device can accurately determine the sixth time stamp information, so that the fourth device can calculate the time deviation between the third device and the fourth device according to the sixth time stamp information and the time of sending and receiving packets in the Ethernet network. , And then time synchronization.

In a possible design, after the second device receives the fifth message from the access device, it extracts the first time stamp information carried in the second protocol field included in the fifth message. In this way, the second device may subsequently determine the sixth time stamp information by using the first time stamp information.

In a possible design, the second protocol field may be an existing protocol field or a protocol field (for example, a NEW field) newly added in an existing protocol stack framework.

According to a thirty-second aspect, the present application further provides a first device having the first method in an example of a method for implementing the twentieth aspect, the twenty-third aspect, the twenty-sixth aspect, or the twenty-ninth aspect. The function of a device. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the first device includes a sending unit, a processing unit, and a receiving unit, and these units may perform the foregoing twentieth aspect, the twenty-third aspect, the twenty-sixth aspect, or the twenty-ninth aspect For the corresponding functions in the method example, see the detailed description in the method example for details.

In a possible design, the structure of the first device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the first device. Corresponding functions in the above-mentioned methods of the twentieth aspect, the twenty-third aspect, the twenty-sixth aspect, or the twenty-ninth aspect. The memory is coupled to the processor and stores program instructions and data necessary for the first device.

According to a thirty-third aspect, the present application further provides an access device having the access method in the method instance for implementing the foregoing twenty-first aspect, twenty-fourth aspect, twenty-seventh aspect, or thirtieth aspect. Into the capabilities of the device. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the access device includes a sending unit and a receiving unit, and these units can execute the method examples in the twenty-first aspect, the twenty-fourth aspect, the twenty-seventh aspect, or the thirtieth aspect described above. For the corresponding functions, see the detailed descriptions in the method examples for details.

In a possible design, the structure of the access device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the access device. Corresponding functions in the above-mentioned methods of the twenty-first aspect, the twenty-fourth aspect, the twenty-seventh aspect, or the thirtieth aspect. The memory is coupled to the processor and stores program instructions and data necessary for accessing the device.

According to a thirty-fourth aspect, the present application further provides a second device having the first method of implementing the twenty-second aspect, the twenty-fifth aspect, the twenty-eighth aspect, or the thirty-first aspect of the method example. Function of the second device. The functions can be realized by hardware, and the corresponding software can also be implemented by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the structure of the second device includes a receiving unit, a processing unit, and a sending unit, and these units may implement the twenty-second aspect, the twenty-fifth aspect, the twenty-eighth aspect, or the thirty-first aspect. For the corresponding functions in the method example, see the detailed description in the method example for details.

In a possible design, the structure of the second device includes a transceiver, a processor, and a memory. The transceiver is used to send and receive data and communicate with other devices in the communication system. The processor is configured to support the execution of the second device. Corresponding functions in the above-mentioned methods of the twenty-second aspect, the twenty-fifth aspect, the twenty-eighth aspect, or the thirty-first aspect. The memory is coupled to the processor and stores program instructions and data necessary for the second device.

According to a thirty-fifth aspect, the present application also provides a computer storage medium. The computer storage medium stores computer-executable instructions. When the computer-executable instructions are called by a computer, the computer executes the foregoing twentieth aspect to the third aspect. Any one of the eleven aspects.

In a thirty-sixth aspect, the present application also provides a computer program product containing instructions that, when run on a computer, causes the computer to execute any one of the methods in the twentieth to thirty-first aspects.

In a thirty-seventh aspect, the present application also provides a chip, which is connected to the memory and is used to read and execute program instructions stored in the memory to implement any one of the foregoing twentieth to thirty-first aspects. method.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an architecture diagram of a communication system provided by the present application;

FIG. 2 is a working schematic diagram of a communication system provided by the present application;

3 is a flowchart of a synchronization method provided by the present application;

4 is a schematic diagram of sending and receiving messages in a synchronization process provided by the present application;

5 is a schematic diagram of a protocol stack framework;

6 is a schematic diagram of another protocol stack framework provided by the present application;

7 is a flowchart of another synchronization method provided by the present application;

8 is a flowchart of another synchronization method provided by the present application;

FIG. 9 is a schematic diagram of sending and receiving messages during another synchronization process provided by this application; FIG.

FIG. 10 is a flowchart of another synchronization method provided by the present application; FIG.

11 is a schematic structural diagram of a first device provided by this application;

FIG. 12 is a schematic structural diagram of an access device provided by this application;

13 is a schematic structural diagram of a second device provided by the present application;

14 is a schematic structural diagram of another first device provided by the present application;

15 is a schematic structural diagram of another first device provided by the present application;

16 is a schematic structural diagram of another second device provided by the present application;

17 is a schematic structural diagram of another first device provided by the present application;

18 is a structural diagram of a first device provided by the present application;

19 is a structural diagram of an access device provided by the present application;

20 is a structural diagram of a second device provided by the present application;

21 is a flowchart of another synchronization method provided by the present application;

FIG. 22 is a schematic diagram of sending and receiving messages in another synchronization process provided by this application; FIG.

FIG. 23 is a working schematic diagram of another communication system provided by the present application; FIG.

24 is a flowchart of another synchronization method provided by the present application;

FIG. 25 is a schematic diagram of sending and receiving messages during another synchronization process provided by this application; FIG.

FIG. 26 is a flowchart of another synchronization method provided by the present application; FIG.

FIG. 27 is a schematic diagram of sending and receiving messages during another synchronization process provided by this application; FIG.

FIG. 28 is a flowchart of another synchronization method provided by the present application; FIG.

FIG. 29 is a schematic diagram of sending and receiving messages during another synchronization process provided in this application.

detailed description

The present application will be further described in detail below with reference to the accompanying drawings.

Embodiments of the present application provide a synchronization method and device, which are used to implement a docking scenario between a mobile network and an Ethernet network (for example, TSN) to meet the time accuracy requirements of an industrial plant. The methods and devices described in this application are based on the same inventive concept. Since the principles of the methods and devices for solving problems are similar, the implementation of the devices and methods can be referred to each other, and duplicated details will not be repeated.

In the following, some terms in this application are explained so as to facilitate understanding by those skilled in the art.

1) Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a way to provide voice and / or data connectivity to users Sexual equipment. For example, in an industrial factory scenario, the terminal device may be a sensor, a servo motor, a mobile robot, or the like.

2) The user plane network element can be used to forward user plane data of the terminal device. The main functions are packet routing and forwarding, and mobility anchors. In addition, the user plane network element can also be used as an uplink classifier to support routing service flows to the data network, or as a branch point to support multi-homed packet data unit (PDU) sessions. For example, the user plane network element may be a user plane function (UPF) network element.

3) The first device and the second device are a master clock node and a node requiring clock synchronization, respectively. During the communication process, the clock of the second device needs to be synchronized to the clock of the first device. Wherein, the first device and the second device are adjacent devices in an Ethernet network; there is at least one hop of other devices between the first device and the second device in a mobile network, for example, connecting Into the device, etc. For example, the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

4) Access equipment, providing wireless access services to terminal equipment. The access network device is a node in a wireless access network, and may also be called a base station, and may also be called a radio access network (RAN) node (or device). At present, some examples of access network equipment are: gNB, transmission receiving point (TRP), evolved Node B (eNB), radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home NodeB, or home NodeB, HNB), baseband unit (base band unit (BBU), or wireless fidelity (Wifi) access point (AP).

5) In the description of this application, words such as "first" and "second" are used only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating or implying order.

In order to describe the technical solution of the embodiment of the present application more clearly, the synchronization method and device provided in the embodiment of the present application are described in detail below with reference to the accompanying drawings.

FIG. 1 illustrates an architecture of a possible communication system to which the synchronization method provided in the embodiment of the present application is applicable. The communication system is divided into an Ethernet network and a mobile network. In the communication system, the Ethernet network is an Ethernet network in an industrial network, and the mobile network is applied to an industrial network and interfaces with the Ethernet network. Among them, the Ethernet network in FIG. 1 is shown by a TSN network, and the mobile network is shown by a fifth generation mobile communication technology (5G) network.

The TSN network includes a programmable logic controller (PLC), other control equipment, and terminal equipment. User plane network elements, etc. The PLC may be a master clock device in the TSN network. For example, the servo motor 1 shown in FIG. 1 is the other control device, and the sensor 1 is a terminal device in the TSN network.

The 5G network may include a user plane network element, an access device, a terminal device, and the like. The user plane network element is shown as UPF in FIG. 1; the access device is shown as a radio access network (RAN) node (or device); the sensor 2, the servo motor 2, and the mobile robot Both are examples of terminal devices.

It should be noted that the TSN network shown in FIG. 1 is only an example of an Ethernet network, and the 5G network is only an example of a mobile network, and cannot be used as a limitation of the communication system of this application. The Ethernet network may also have various other examples. , And the mobile network may also have various other examples, which are not listed here one by one.

FIG. 2 shows a working schematic diagram of a communication system to which a synchronization method provided in an embodiment of the present application is applicable.

The message in FIG. 2 may be an Ethernet message, an Ethernet data packet, or the like, and the message may be transmitted as a data packet during a PDU session in a mobile network.

The master clock device in the Ethernet network is a PLC, and the PLC determines the master clock in the Ethernet network. FIG. 2 shows that the master clock in the Ethernet synchronization domain is T1. In the Ethernet synchronization domain, UE and UPF are considered as two adjacent nodes. When performing clock synchronization, when the UPF is used as a master clock node, the UE needs to perform clock synchronization according to the master clock information of the UPF.

In the mobile network synchronization domain, the main clock device can be a building integrated timing supply system (building integrated timing supply, BITS) or time server, global positioning system (GPS), Beidou, etc., which is determined by the main clock device. The master clock in the mobile network is described. FIG. 2 shows that the master clock in the synchronization domain of the mobile network is T2. Correspondingly, there are other multi-hop devices between the UE and the UPF that are adjacent nodes in the Ethernet network, such as RAN. However, the current clock synchronization in the mobile network has been implemented, so the clock synchronization in the Ethernet network can be performed according to the clock synchronization in the mobile network.

It should be noted that FIG. 2 only shows the case where the UPF is used as the master clock node and the UE needs to perform clock synchronization. Optionally, in FIG. 2, the positions of the UE and the UPF may be interchanged, that is, the UE may serve as the master clock node, and the UPF needs to perform clock synchronization.

It should be noted that the UE in FIG. 2 is only an example of a terminal device, and the UE may also be replaced with another terminal device (for example, the mobile robot and the sensor 2 in FIG. 1); the UPF is only used as a type of user plane network element. For example, the UPF may also be replaced by other user plane network elements, which is not limited in this application.

A synchronization method provided in the embodiment of the present application is applicable to the communication system shown in FIG. 1 and FIG. 2. For example, the first device in FIG. 3 is the above-mentioned UPF and the second device is a UE, or the first device is a UE and the second device is a UPF. Referring to FIG. 3, the specific process of the method includes:

Step 301: The first device sends a first message to the access device. The first message carries first time stamp information, and determines second time stamp information. The first time stamp information is the first time stamp information. The time in the Ethernet network when the device sends the first message, and the second time stamp information is the time in the mobile network when the first device sends the first message.

In an optional implementation manner, before the first device sends the first packet to an access device, the first device receives a data packet from an Ethernet network (for example, TSN), so When the first device recognizes that the format information of the data packet is 0x88f7, it determines that the data packet is an 802.1AS synchronization data packet. Then, the first device sends the first message to the access device, and a clock synchronization process is initiated at this time.

For example, FIG. 4 shows a schematic diagram of message transmission and reception during synchronization between the first device and the second device. Among them, the solid line in FIG. 4 indicates the transmission of the message in the Ethernet network, and the dotted line indicates the transmission of the message in the mobile network. It should be understood that the solid line and the dotted line in FIG. 4 indicate the same message Transmission.

For example, the time corresponding to the first time stamp information in step 301 is recorded as t1 in FIG. 4, and the second time stamp information is recorded as t1 ′ in FIG. 4.

Optionally, after the first device determines the second time stamp information, the second time stamp information is recorded locally, so that the first device subsequently calculates a round-trip between the first device and the second device. Transmission delay difference.

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element. That is, either the user plane network element or the terminal device may be a master clock node, and the other needs to perform clock synchronization.

Step 302: The access device sends a third message to the second device based on the first message, and the third message carries the first time stamp information.

When the access device performs step 302, the access device may specifically forward the first packet to the second device, and the third packet is the first packet. A message.

Step 303: The second device determines third time stamp information and eighth time stamp information. The third time stamp information is a time in the mobile network when the second device receives the third message. The eighth time stamp information is a time in the Ethernet network when the second device receives the third message.

For example, in FIG. 4, the time corresponding to the third time stamp information is recorded as t2 ', and the eighth time stamp information is recorded as t2.

Step 304: The second device sends a fourth message to the access device. The fourth message carries the third time stamp information and the fourth time stamp information. The fourth time stamp information is The time in the mobile network when the second device sends the fourth message to the access device.

For example, in FIG. 4, the time corresponding to the fourth time stamp information is denoted as t3 '.

Optionally, a flag may be carried in the fourth message, and the flag is used to indicate that the fourth message carries time stamp information indicating a time in the mobile network.

In an optional implementation manner, the fourth packet carries the third timestamp information and the fourth timestamp information, and a specific implementation method may be: the second device sends the third timestamp information The timestamp information and the fourth timestamp information are carried in a second protocol field included in the fourth message. Wherein, optionally, the second protocol field may be an existing protocol field in the fourth message in the current protocol stack framework; the second protocol field may also be described in the current protocol stack framework Newly added protocol field in the fourth message. Optionally, when the fourth packet further carries a flag, the flag may also be carried in the second protocol field.

For example, FIG. 5 shows a schematic diagram of an existing protocol stack framework, which indicates field examples (that is, message format examples) of packets in different positions (that is, different devices) in the protocol stack framework.

Based on the example in FIG. 5, the second protocol field is described in detail:

In an exemplary embodiment, when the second device is a terminal device and the first device is a user plane network element, the second protocol field may have the following two situations:

Case a1: The second protocol field may be a service data protocol (SDAP) field or a data convergence protocol (PDCP) field. In this case, the second device encapsulates the third timestamp information and the fourth timestamp information in a message protocol field SDAP field or a PDCP field corresponding to the terminal device as shown in FIG. 5, Then, the fourth packet obtained after the encapsulation is sent to the access device.

Of course, in addition to the above SDAP field or PDCP field, the second protocol field may also be any other field in the message protocol field corresponding to the terminal device shown in FIG. When the two protocol fields are other protocol fields, they will not be repeated one by one here.

Case a2: The second protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, the second device adds a new protocol field NEW field to the message protocol field corresponding to the terminal device shown in FIG. 5, for example, as described in the protocol stack architecture shown in FIG. The message protocol field corresponding to the terminal device is shown; then the third timestamp information and the fourth timestamp information are encapsulated in a NEW field, and the encapsulated fourth message is sent to the access device .

It should be noted that the NEW field is only used as an example. For example, the NEW field may also have any other names with the same function, which is not limited by comparison in this application.

In another exemplary embodiment, when the second device is a user plane network element and the first device is a terminal device, the second protocol field may have the following two situations:

Case b1: The second protocol field is a general packet radio service tunneling protocol (General Packet Radio Service, GPRS) tunneling protocol (GTP) field. In this case, the second device encapsulates the third time stamp information and the fourth time stamp information in a message protocol field GTP field corresponding to the user plane network element shown in FIG. 5, and then The fourth packet obtained after the encapsulation is sent to the access device.

Of course, in addition to the above GTP field, the second protocol field may also be any other field in the message protocol field corresponding to the user plane network element shown in FIG. 5, which is not limited in this application for comparison. When the protocol fields are other fields, they are not repeated here one by one.

Case b2: The second protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, the second device adds a new protocol field, the NEW field, to the message protocol field corresponding to the user plane network element shown in FIG. 5, for example, in the protocol stack architecture shown in FIG. As shown in the message protocol field corresponding to the user plane network element; then the third timestamp information and the fourth timestamp information are encapsulated in a NEW field, and the encapsulated fourth message is sent to all Mentioned access equipment.

Step 305: The second device determines ninth time stamp information, where the ninth time stamp information is a time in the Ethernet network when the second device sends the fourth message to the access device.

For example, in FIG. 4, the time corresponding to the ninth time stamp information is denoted as t3.

Step 306: The access device sends a second message to the first device, and the second message carries the third time stamp information and the fourth time stamp information.

Optionally, the access device sends a second message to the first device. The specific method may be: when the access device detects that the second protocol field included in the fourth message carries a third message, When the timestamp information and the fourth timestamp information, the third timestamp information and the fourth timestamp information are encapsulated into a first protocol field included in the fourth message, and the second message is generated And sending the second message to the first device.

For example, for the specific situation of the second protocol field, refer to the related description of the second protocol field in step 304. Similarly, the first protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. The actual conditions of the first protocol field may be divided into multiple types according to the actual conditions of the first device and the second device, and the actual conditions of the two protocol fields are different.

In a possible implementation manner, when the second protocol field conforms to the condition a1 in step 304, the first protocol field may have the following two situations:

Case c1: The first protocol field may be a GTP field. In this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in an SDAP field or a PDCP field in the received fourth message, the access device The access device extracts the third timestamp information and the fourth timestamp information from the SDAP field or the PDCP field, and then encapsulates them in a message protocol field GTP corresponding to the access device as shown in FIG. 5 In the field, the second message is generated. At this time, the GTP field of the second message includes the third time stamp information and the fourth time stamp information.

Of course, in addition to the above GTP field, the first protocol field may also be any other field in the packet protocol field corresponding to the access device shown in FIG. 5, which is not limited in this application comparison. The first protocol When the fields are other protocol fields, they are not repeated here one by one.

Case c2: The first protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in an SDAP field or a PDCP field in the received fourth message, The access device extracts the third timestamp information and the fourth timestamp information from an SDAP field or a PDCP field, and then the access device corresponds to the access device shown in FIG. 5 A new protocol field, the NEW field, is added to the message protocol field, for example, shown in the message protocol field corresponding to the access device in the protocol stack architecture shown in FIG. 6; and then the third time stamp information and the The fourth timestamp information is encapsulated in a NEW field to obtain the second message. At this time, the NEW field of the second message includes the third timestamp information and the fourth timestamp information.

In another possible implementation manner, when the second protocol field meets the condition a2 in step 304, the first protocol field may have the following two situations:

Case d1: The first protocol field may be a GTP field. In this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in a NEW field in the received fourth packet, the access device Extracting the third timestamp information and the fourth timestamp information from the NEW field, and then encapsulating them in a message protocol field GTP field corresponding to the access device as shown in FIG. 5 to generate the In the second message, the GTP field of the second message includes the third time stamp information and the fourth time stamp information.

Case d2: The first protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in a NEW field in the received fourth message, the access device The incoming device extracts the third timestamp information and the fourth timestamp information from the NEW field, and then the access device adds a message protocol field corresponding to the access device shown in FIG. 5 A new protocol field, the NEW field, for example, shown in the protocol field of the message corresponding to the access device in the protocol stack architecture shown in FIG. 6; and then encapsulating the third time stamp information and the fourth time stamp information In the NEW field, the second message is obtained. At this time, the NEW field of the second message includes the third time stamp information and the fourth time stamp information.

In another possible implementation manner, when the second protocol field meets the condition b1 in step 304, the first protocol field may have the following two situations:

Case e1: The first protocol field may be an SDAP field or a PDCP field. In this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in a received GTP field in the fourth packet, the access device Extracting the third timestamp information and the fourth timestamp information from a GTP field, and then encapsulating them in a message protocol field SDAP field or a PDCP field corresponding to the access device as shown in FIG. 5, Generate the second message, and at this time, the SDAP field or the PDCP field of the second message includes the third time stamp information and the fourth time stamp information.

Of course, in addition to the above-mentioned SDAP field or PDCP field, the first protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. When the first protocol field is other protocol fields, details are not repeated here.

Case e2: The first protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in the received GTP field in the fourth message, the access device The incoming device extracts the third timestamp information and the fourth timestamp information from the GTP field, and then the access device adds a message protocol field corresponding to the access device shown in FIG. 5 A new protocol field, the NEW field, for example, shown in the protocol field of the message corresponding to the access device in the protocol stack architecture shown in FIG. 6; and then encapsulating the third time stamp information and the fourth time stamp information In the NEW field, the second message is obtained. At this time, the NEW field of the second message includes the third time stamp information and the fourth time stamp information.

In another possible implementation manner, when the second protocol field meets the condition b2 in step 304, the first protocol field may have the following two situations:

Case f1: The first protocol field may be an SDAP field or a PDCP field. In this case, when the access device detects that the third time stamp information and the fourth time stamp information are encapsulated in a NEW field in the received fourth packet, the access device Extracting the third timestamp information and the fourth timestamp information from the NEW field, and then encapsulating them in a message protocol field SDAP field or a PDCP field corresponding to the access device as shown in FIG. 5, Generate the second message, and at this time, the SDAP field or the PDCP field of the second message includes the third time stamp information and the fourth time stamp information.

Of course, in addition to the above-mentioned SDAP field or PDCP field, the first protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. 5, which is not limited in this application comparison. When the first protocol field is other protocol fields, details are not repeated here.

Case f2: It is the same as the above case d2, and you can refer to each other.

Optionally, when the flag is carried in the fourth packet, in the above case c1, c2, d1, d2, e1, e2, f1, f2, the access device may detect the first When the second protocol field in the four packets includes the flag, the foregoing process is performed. Optionally, the access device simultaneously extracts the flag from the second protocol field, and encapsulates the flag in the first protocol field.

Optionally, after the first device receives the second message, the first device extracts the third time stamp information and the third time stamp information carried in the first protocol field included in the second message. The fourth time stamp information. For example, according to the various situations of the first protocol field described above, it can be divided into the following three cases:

Case g1: The first device extracts the third time stamp information and the fourth time stamp information in a GTP field. In this case, the first device is a user plane network element, and a message protocol field corresponding to the first device is a field corresponding to the user plane network element shown in FIG. 5.

Case g2: The first device extracts the third time stamp information and the fourth time stamp information in an SDAP field or a PDCP field. In this case, the first device is a terminal device, and a message protocol field corresponding to the first device is a field corresponding to the terminal device shown in FIG. 5.

Case g3: The first device extracts the third time stamp information and the fourth time stamp information in a NEW field. In this case, the first device is a terminal device or a user plane network element. When the first device is a terminal device, a message protocol field corresponding to the first device is a field corresponding to the terminal device shown in FIG. 6; when the first device is a user plane network element, all The message protocol field corresponding to the first device is a field corresponding to the user plane network element shown in FIG. 6.

In an optional implementation manner, when the access device detects that the second protocol field is a NEW field, the NEW field encapsulates the third time stamp information and the fourth time stamp information. When the access device does not process the fourth message, it may directly forward the fourth message to the first device. At this time, the fourth message is the second message. Text. In this way, after the first device receives the second packet, the first device can directly extract the third time stamp information and the first time stamp information in the second protocol field (that is, the NEW field). Four timestamp information. At this time, the message protocol field corresponding to the first device is a field corresponding to the user plane network element or the terminal device shown in FIG. 6. In this process, a message protocol field corresponding to the access device is a field corresponding to the access device shown in FIG. 5.

Step 307: The first device determines fifth time stamp information and sixth time stamp information. The fifth time stamp information is a time in the Ethernet network when the first device receives the second packet. The sixth time stamp information is a time in the mobile network when the first device receives the second message.

For example, in FIG. 4, the time corresponding to the fifth time stamp information is recorded as t4; the time corresponding to the sixth time stamp information is recorded as t4 '.

Step 308: The first device determines a first time stamp according to the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, and the sixth time stamp information. Seven timestamp information.

In an optional implementation manner, when the first device executes step 308, the specific method may be: the first device according to the second time stamp information (t1 ') and the third time stamp information (t2 '), the fourth timestamp information (t3'), and the sixth timestamp information (t4 ') determine a round-trip transmission delay difference between the first device and the second device; The first device calculates a sum of a time (t4) corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the seventh time stamp information.

For example, the clock synchronization between the first device and the second device that has been implemented within the mobile network may be used to calculate the round-trip transmission delay difference between the first device and the second device. For example, it can be calculated by the following formulas 1 and 2:

t2’-t1 ’= delay1 + offset1 formula one;

t4’-t3 ’= delay2-offset1 Equation 2;

In the above formula, offset1 is the time difference between the first device and the second device in the mobile network; delay1 is the transmission delay from the first device to the second device; delay2 is the second A transmission delay of the device to the first device.

Due to the internal clock synchronization of the mobile, the value of the above-mentioned offset1 is 0, so the round-trip transmission delay difference value delay1-delay2 = t2'-t1'-t4 '+ t3' can be obtained through the above formulas 1 and 2.

Further, the time corresponding to the seventh timestamp information is t4 + t2'-t1'-t4 '+ t3'.

Step 309: The first device sends the seventh time stamp information to the access device.

For example, in the prior art, the first device sends the fifth timestamp information to the access device, so that the access device sends the fifth time stamp information to the second device. In this application, the first device sends the seventh time stamp information to the second device by using the existing method for sending the fifth time stamp information. It can also be understood that instead of the fifth timestamp information, the seventh timestamp information is sent to the second device. In this way, when the second device receives the seventh timestamp information, it will send The seventh timestamp information is treated as the fifth timestamp information in the prior art.

Step 310: The access device sends the seventh timestamp information to the second device.

Step 311: The second device according to the first time stamp information (t1), the eighth time stamp information (t2), the ninth time stamp information (t3), and the seventh time stamp information ( t4 + t2'-t1'-t4 '+ t3') determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation.

In an optional implementation manner, as described in step 309, the second device may determine, according to the seventh timestamp information, when the first device thinks that the first device receives the second packet. The time in the Ethernet network uses the seventh timestamp information as the fifth timestamp information.

Optionally, the time offset offset2 between the first device and the second device may meet the following formula 3:

It should be noted that the packets involved in this embodiment are all 802.1AS protocol packets.

In an optional implementation manner, when the timestamp information corresponding to the time in the mobile network mentioned above is carried in any one of the GTP field, SDAP field, and NEW field in the message, it may be in the corresponding protocol. N bytes are reserved in the field for timestamp information. For example, N is a positive integer, for example, N is 10. Optionally, when the protocol field China carries a flag in addition to the timestamp information, M bytes are reserved in the protocol field for a flag, where M is a positive integer, for example, M is 1.

By adopting the synchronization method provided in the embodiment of the present application, the first device determines the seventh time stamp information by using the time stamp information of the message transmitted and received in the mobile network, so that the second device is based on the seventh time stamp information and the Ethernet network. The time of sending and receiving packets is used to calculate the time deviation between the first device and the second device, and then perform time synchronization. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 2. For example, the first device in FIG. 7 is the above-mentioned UPF and the second device is a UE, or the first device is a UE and the second device is a UPF. Referring to FIG. 7, the specific process of the method may include:

Step 701: The first device sends a first message to the access device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is sent by the first device. The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message.

The trigger condition for the clock synchronization process initiated by the first device is the same as the principle described in step 301 in the embodiment shown in FIG.

The schematic diagram of message transmission and reception during synchronization between the first device and the second device shown in FIG. 4 can also be referred to in this embodiment. For example, in FIG. 4, the time corresponding to the first time stamp information in step 401 is recorded as t1 in FIG. 4, and the second time stamp information is recorded as t1 'in FIG.

Optionally, a flag may be carried in the first message, and the flag is used to indicate that the first message carries time stamp information indicating a time in a mobile network.

In an optional implementation manner, the first packet carries the second timestamp information, and a specific implementation method may be: the first device carries the second timestamp information in the first A message is included in a first protocol field. Wherein, optionally, the first protocol field may be an existing protocol field in the first message in the current protocol stack framework; the first protocol field may also be described in the current protocol stack framework Newly added protocol field in the first message. Optionally, when a flag is also carried in the first packet, the flag may also be carried in the first protocol field.

Similarly, based on the example shown in FIG. 5, the first protocol field is described in detail:

In an exemplary embodiment, when the first device is a terminal device and the second device is a user plane network element, the first protocol field may have the following two situations:

Case h1: The first protocol field may be an SDAP field or a PDCP field. In this case, the first device encapsulates the second time stamp information in a message protocol field SDAP field or a PDCP field corresponding to the terminal device as shown in FIG. 5, and then encapsulates the first obtained A message is sent to the access device.

Of course, in addition to the above-mentioned SDAP field or PDCP field, the first protocol field may also be any other field in the message protocol field corresponding to the terminal device shown in FIG. 5, which is not limited in this application comparison. When one protocol field is another protocol field, details are not repeated here.

Case h2: The first protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, the first device adds a new protocol field, the NEW field, to the message protocol field corresponding to the terminal device shown in FIG. 5, for example, as described in the protocol stack architecture shown in FIG. The message protocol field corresponding to the terminal device is shown; then the second time stamp information is encapsulated in a NEW field, and the first message obtained after the encapsulation is sent to the access device.

In another exemplary embodiment, when the first device is a user plane network element and the second device is a terminal device, the first protocol field may have the following two situations:

Case i1: The first protocol field is a GTP field. In this case, the first device encapsulates the second time stamp information in a message protocol field GTP field corresponding to the user plane network element shown in FIG. 5, and then encapsulates the first message obtained by the encapsulation. Sending to the access device.

Of course, in addition to the above-mentioned GTP field, the first protocol field may also be any other field in the message protocol field corresponding to the user plane network element shown in FIG. When the protocol fields are other fields, they are not repeated here one by one.

Case i2: The first protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, the first device adds a new protocol field, the NEW field, to the message protocol field corresponding to the user plane network element shown in FIG. 5, for example, in the protocol stack architecture shown in FIG. The message protocol field corresponding to the user plane network element is shown; then the second time stamp information is encapsulated in a NEW field, and the first message obtained after the encapsulation is sent to the access device.

Step 702: The access device sends a third message to the second device based on the first message, and the third message carries the first time stamp information and the second time stamp information.

In an optional implementation manner, the access device sends the third message to the second device based on the first message, and a specific method may be: when the access device detects all the When the first protocol field included in the first packet includes the second time stamp information, the access device encapsulates the second time stamp information into the second protocol field included in the first packet. To generate the third message, and send the third message to the second device. At this time, the second protocol field of the third message carries the second time stamp information.

For example, for details about the first protocol field, reference may be made to the related description of the first protocol field in step 701. Similarly, the second protocol field may be an existing protocol field or a newly added field in an existing protocol stack framework. Wherein, the actual situation of the second protocol field may be divided into multiple types according to the actual situation of the first device and the second device and the actual situation of the first protocol field.

In a possible implementation manner, when the first protocol field meets the condition h1 in step 701, the second protocol field may have the following two situations:

Case j1: The second protocol field may be a GTP field. In this case, when the access device detects that the second time stamp information is encapsulated in an SDAP field or a PDCP field in the received first packet, the access device adds the second time stamp information. The timestamp information is extracted from the SDAP field or the PDCP field, and then encapsulated in the message protocol field GTP field corresponding to the access device as shown in FIG. 5 to generate the third message. The GTP field of the three messages includes the second time stamp information.

Of course, in addition to the above GTP field, the second protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. When the fields are other protocol fields, they are not repeated here one by one.

Case j2: The second protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the second time stamp information is encapsulated in the SDAP field or the PDCP field in the received first packet, the access device changes the The second timestamp information is extracted from the SDAP field or the PDCP field, and then the access device adds a new protocol field, the NEW field, to the message protocol field corresponding to the access device shown in FIG. 5, for example, as shown in FIG. The protocol protocol field shown in FIG. 6 indicates the message protocol field corresponding to the access device; then the second timestamp information is encapsulated in a NEW field to obtain the third message. The NEW field of the three messages contains the second time stamp information.

In another possible implementation manner, when the first protocol field meets the condition h2 in step 701, the second protocol field may have the following two situations:

Case k1: The second protocol field may be a GTP field. In this case, when the access device detects that the second time stamp information is encapsulated in a NEW field in the received first packet, the access device adds the second time stamp information Extracted from the NEW field, and then encapsulated in the GTP field of the message protocol field corresponding to the access device as shown in FIG. 5 to generate the third message. At this time, the GTP field of the third message The second time stamp information is included.

Of course, in addition to the above GTP field, the second protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. 5, which is not limited in this application comparison. The second protocol When the fields are other protocol fields, they are not repeated here one by one.

Case k2: The second protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the second time stamp information is encapsulated in a NEW field in the received first packet, the access device sets the second time The stamp information is extracted from the NEW field, and then the access device adds a new protocol field, the NEW field, to the message protocol field corresponding to the access device shown in FIG. 5, such as the protocol stack shown in FIG. The message protocol field corresponding to the access device in the architecture is shown; then the second timestamp information is encapsulated in a NEW field to obtain the third message, and at this time, the NEW field of the third message The second time stamp information is included.

In another possible implementation manner, when the first protocol field meets the condition i1 in step 701, the second protocol field may have the following two situations:

Case l1: The second protocol field may be an SDAP field or a PDCP field. In this case, when the access device detects that the second time stamp information is encapsulated in a received GTP field in the first packet, the access device adds the second time stamp information Extracted from the GTP field, and then encapsulated in the SDAP field or the PDCP field of the message protocol field corresponding to the access device as shown in FIG. 5 to generate the third message. At this time, the third message The SDAP field or the PDCP field of the second time stamp information.

Of course, in addition to the above-mentioned SDAP field or PDCP field, the second protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. When the second protocol field is another protocol field, details are not repeated here.

Case 12: The second protocol field may be a newly added protocol field in the protocol stack shown in FIG. 5, and may be recorded as a new protocol field (hereinafter referred to as a NEW field). For example, in this case, when the access device detects that the second time stamp information is encapsulated in the received GTP field in the first packet, the access device sets the second time The stamp information is extracted from the GTP field, and then the access device adds a new protocol field NEW field to the message protocol field corresponding to the access device shown in FIG. 5, such as the protocol stack shown in FIG. The message protocol field corresponding to the access device in the architecture is shown; then the second timestamp information is encapsulated in a NEW field to obtain the third message, and at this time, the NEW field of the third message The second time stamp information is included.

In another possible implementation manner, when the second protocol field meets the condition i2 in step 701, the second protocol field may have the following two situations:

Case m1: The second protocol field may be an SDAP field or a PDCP field. In this case, when the access device detects that the second time stamp information is encapsulated in a NEW field in the received first packet, the access device adds the second time stamp information Extracted from the NEW field, and then encapsulated in the SDAP field or PDCP field of the message protocol field corresponding to the access device as shown in FIG. 5 to generate the third message. At this time, the third message The SDAP field or the PDCP field of the second time stamp information.

Of course, in addition to the above-mentioned SDAP field or PDCP field, the second protocol field may also be any other field in the message protocol field corresponding to the access device shown in FIG. 5, which is not limited in this application comparison. When the second protocol field is another protocol field, details are not repeated here.

Case m2: The same as the above case k2, which can be referred to each other, and will not be described again here.

Optionally, when the flag is carried in the first packet, in the foregoing situation j1, j2, k1, k2, l1, l2, m1, and m2, the access device may detect the When the flag is included in the first protocol field in the message, the foregoing process is performed. Optionally, the access device may simultaneously extract the flag from the first protocol field, and encapsulate the flag in the second protocol field.

Optionally, after the second device receives the third message, the second device extracts the second time stamp information carried in the second protocol field included in the third message. For example, according to the various situations of the second protocol field described above, it can be divided into the following three cases:

Case n1: The second device extracts the second time stamp information in a GTP field. In this case, the second device is a user plane network element, and the message protocol field corresponding to the second device is a field corresponding to the user plane network element shown in FIG. 5.

Case n2: The second device extracts the second time stamp information in an SDAP field or a PDCP field. In this case, the second device is a terminal device, and a message protocol field corresponding to the second device is a field corresponding to the terminal device shown in FIG. 5.

Case n3: The second device extracts the second time stamp information in a NEW field. In this case, the second device is a terminal device or a user plane network element. When the second device is a terminal device, a message protocol field corresponding to the second device is a field corresponding to the terminal device shown in FIG. 6; when the second device is a user plane network element, all The message protocol field corresponding to the second device is a field corresponding to the user plane network element shown in FIG. 6.

In an optional implementation manner, when the access device detects that the first protocol field is a NEW field, that is, when the second time stamp information is encapsulated in a NEW field, the access device may The first message is not processed, and the first message is directly forwarded to the second device. At this time, the first message is the third message. In this way, after the second device receives the third message, the second device can directly extract the second time stamp information in the first protocol field (ie, the NEW field). At this time, the message protocol field corresponding to the second device is a field corresponding to the user plane network element or the terminal device shown in FIG. 6. In this process, a message protocol field corresponding to the access device is a field corresponding to the access device shown in FIG. 5.

Step 703: The second device determines fifth time stamp information and sixth time stamp information. The fifth time stamp information is a time in the Ethernet network when the second device receives the third packet. The sixth time stamp information is a time in the mobile network when the second device receives the third message.

For example, the time corresponding to the fifth time stamp information may be t2 in FIG. 4, and the time corresponding to the sixth time stamp information may be t2 'in FIG.

Step 704: The second device sends a fourth message to the access device.

The fourth message may not carry any time stamp information, and is only used as a message for identifying a message receiving and sending time in the synchronization process. For example, the time stamp information in the following step 705 is obtained based on the fourth message.

Step 705: The second device determines seventh timestamp information and eighth timestamp information. The seventh timestamp information is described when the second device sends the fourth message to the access device. The time in the Ethernet network, and the eighth time stamp information is the time in the mobile network when the second device sends the fourth message to the access device.

For example, the time corresponding to the seventh timestamp information may be t3 in FIG. 4, and the time corresponding to the eighth timestamp information may be t3 'in FIG.

Step 706: The access device sends a second message to the first device based on the fourth message.

When the access device performs step 706, the access device may specifically forward the fourth packet to the first device, and the fourth packet is the second packet. Message.

Step 707: After receiving the second message, the first device determines third time stamp information and fourth time stamp information. The third time stamp information is the second message received by the first device. The time in the Ethernet network, and the fourth time stamp information is the time in the mobile network when the first device received the second message.

For example, the time corresponding to the third time stamp information may be t4 in FIG. 4, and the time corresponding to the fourth time stamp information may be t4 'in FIG.

Step 708: The first device sends the third time stamp information and the fourth time stamp information to the access device.

Optionally, when the first device executes step 708, the specific method may be: the first device sends a fifth message to the access device, and the fifth message carries the third time stamp information And the fourth timestamp information.

Wherein, the fifth message carries the fourth timestamp information, and the processing principle of the fifth message by the first device is the same as that carried in the first message in step 701. The condition of the second timestamp and the processing principle of the first packet by the first device are the same, and can be referred to each other, and details are not described in detail here.

Step 709: The access device sends the third time stamp information and the fourth time stamp information to the second device.

Optionally, the specific method for the access device to perform step 709 may be: the access device sends a sixth message to the second device based on the fifth message, and the sixth message carries The third time stamp information and the fourth time stamp information.

Wherein, the sixth message carries the fourth time stamp information, and the principle that the access device processes the fifth message to generate the sixth message is the same as that described in step 702. The third message carries the second timestamp information, and the principle that the access device generates the third message by processing the first message is the same, and you can refer to each other. More details.

Step 710: The second device according to the first timestamp information, the second timestamp information, the sixth timestamp information, the eighth timestamp information, the third timestamp information, The fourth time stamp information, the fifth time stamp information, and the seventh time stamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation.

In an optional implementation manner, when the second device executes step 710, the specific method may be: the second device according to the second time stamp information (t1 ') and the sixth time stamp information (t2 '), the eighth timestamp information (t3'), and the fourth timestamp information (t4 ') determine a round-trip transmission delay difference between the first device and the second device; The second device according to the first time stamp information (t1), the third time stamp information (t4), the fifth time stamp information (t2), the seventh time stamp information (t3), and The round-trip transmission delay difference value determines a time deviation between the first device and the second device.

Wherein, optionally, for the calculation process of the round-trip delay difference value, refer to formula 1 and formula 2 in the embodiment shown in FIG. 3, and then calculate the round-trip transmission delay difference value delay1-delay2 = t2 ' -t1'-t4 '+ t3'. For details, refer to the detailed process in step 308, which will not be repeated here.

In an optional implementation manner, the second device is based on the first timestamp information, the third timestamp information, the fifth timestamp information, the seventh timestamp information, and the The round-trip transmission delay difference determines the time deviation between the first device and the second device. The specific method may be: the second device determines ninth time stamp information, and the ninth time stamp information is A sum of a time corresponding to the third timestamp information and the round-trip transmission delay difference; the second device according to the first timestamp information, the fifth timestamp information, and the seventh timestamp information And the ninth time stamp information determines a time offset between the first device and the second device.

For example, based on the round-trip transmission delay difference value obtained above, it can be obtained that the time corresponding to the ninth time stamp information is t4 + t2'-t1'-t4 '+ t3'.

Optionally, the time deviation between the first device and the second device may still conform to Formula 3 in the embodiment shown in FIG. 3, which is not described in detail here.

By adopting the synchronization method provided in the embodiment of the present application, the second device calculates a time offset between the first device and the second device by using time stamp information of a message sent and received in a mobile network and time stamp information of a message sent and received in an Ethernet network. Furthermore, time synchronization is performed. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 2. For example, the first device in FIG. 8 is the above-mentioned UPF and the second device is a UE, or the first device is a UE and the second device is a UPF. Referring to FIG. 8, the specific process of the method may include:

Step 801: The first device sends a first message to the access device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is sent by the first device. The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message.

In an optional implementation manner, before the first device sends the first packet to an access device, the first device receives a data packet from an Ethernet network (for example, TSN), so After the first device recognizes that the data packet is an 802.1AS frequency synchronization data packet, the first device sends the first message to the access device, and then initiates a clock synchronization process (here, the frequency Synchronization process).

For example, FIG. 9 shows a schematic diagram of message transmission and reception during the frequency synchronization between the first device and the second device. Among them, the solid line in FIG. 9 indicates the transmission of the message in the Ethernet network, and the dotted line indicates the transmission of the message in the mobile network. It should be understood that the solid line and the dashed line in the same direction in FIG. 9 indicate the same message. Transmission.

For example, the time corresponding to the first time stamp information in step 801 is recorded as t5 in FIG. 9, and the second time stamp information is recorded as t5 'in FIG. 9.

Optionally, the first protocol field may be the same as the first protocol field in step 701 in the embodiment shown in FIG. 7. For a detailed description of the first protocol field, refer to the related description in step 701 and repeat. The details are not repeated here.

Step 802: The access device sends a third message to the second device based on the first message, and the third message carries the first time stamp information and the second time stamp information.

In an optional implementation manner, the access device sends a third packet to the second device based on the first packet. The specific method may be: when the access device detects the first packet When the first protocol field included in the text includes the second time stamp information, the access device encapsulates the second time stamp information into a third protocol field included in the first message, and generates the second time stamp information. A third message, and sending the third message to the second device.

For example, the first protocol field is the same as the first protocol field in step 801, and similarly, reference may be made to the related description in step 701. The third protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending a third message to the second device based on the first message is the same as that in step 702 in the embodiment shown in FIG. 7 by the access device to the second device based on the first message. The device sends the third packet with the same principle. For related principles, see step 702. The third protocol field may be the same as the second protocol field in step 702, and may be referred to each other, and details are not described herein again.

Step 803: The second device determines fifth timestamp information and sixth timestamp information. The fifth timestamp information is a time in the Ethernet network when the second device receives the third packet. The sixth time stamp information is a time in the mobile network when the second device receives the third message.

For example, the time corresponding to the fifth time stamp information may be t6 in FIG. 9, and the time corresponding to the sixth time stamp information may be t6 'in FIG.

Step 804: The first device sends a second message to the access device. The second message carries third time stamp information and fourth time stamp information, and the third time stamp information is the first time stamp information. The time in the Ethernet network when the device sends the second message, and the fourth time stamp information is the time in the mobile network when the first device sends the second message.

For example, the time corresponding to the third time stamp information may be t8 in FIG. 9, and the time corresponding to the fourth time stamp information may be t8 'in FIG.

Optionally, the fourth message carries the fourth timestamp information, and a specific implementation method may be: the first device carries the fourth timestamp information in a first message included in the second message. Second agreement field. Optionally, the second protocol field may be an existing protocol field in the second message in the current protocol stack framework; the second protocol field may also be the second protocol field in the current protocol stack framework Newly added protocol field in the message. Optionally, when the second packet also carries a flag, the flag may also be carried in the second protocol field.

Optionally, the second protocol field may be the same as the first protocol field in step 701 in the embodiment shown in FIG. 7. For a detailed description of the second protocol field, see the first protocol field in step 701. Relevant descriptions are not repeated here.

Step 805: The access device sends a fourth message to the second device based on the second message, and the fourth message carries the third time stamp information and the fourth time stamp information. .

In an optional implementation manner, the specific method for the access device to send a fourth message to the second device based on the second message may be: when the access device detects the second message When the included second protocol field includes the fourth timestamp information, the access device encapsulates the fourth timestamp information into a fourth protocol field of the second message to generate the fourth A message, and sending the fourth message to the second device.

For example, the second protocol field is the same as the second protocol field in step 804, and similarly, reference may be made to the description of the first protocol field in step 701. The fourth protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending a fourth packet to the second device based on the second packet is the same as that in step 702 in the embodiment shown in FIG. 7 by the access device to the second device based on the first packet. The device sends the third packet with the same principle. For related principles, see step 702. The fourth protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

Step 806: The second device determines seventh timestamp information and eighth timestamp information. The seventh timestamp information is a time in the Ethernet network when the second device receives the fourth packet. The eighth time stamp information is a time in the mobile network when the second device receives the fourth message.

For example, the time corresponding to the seventh time stamp information may be t7 in FIG. 9, and the time corresponding to the eighth time stamp information may be t7 'in FIG.

Step 807: The second device according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, The sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a frequency deviation between the first device and the second device, and perform frequency synchronization according to the frequency deviation.

In an optional implementation manner, the second device is based on the first timestamp information (t5), the second timestamp information (t5 '), the third timestamp information (t8), The fourth timestamp information (t8 '), the fifth timestamp information (t6), the sixth timestamp information (t6'), the seventh timestamp information (t7), and the eighth The timestamp information (t7 ') determines a frequency deviation between the first device and the second device, and a specific method may be: the second device determines that a time corresponding to the sixth timestamp information is different from the first time A first difference between the times corresponding to the two timestamp information, and a second difference between the times corresponding to the eighth timestamp information and the times corresponding to the fourth timestamp information; and the second device according to the First time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, the first difference value and the second difference value determine the first device and A frequency deviation between the second devices. Among them, for example, the first difference may be recorded as t6'-t5 ', and the second difference may be recorded as t7'-t8'.

In an optional implementation manner, the second device is based on the first timestamp information, the third timestamp information, the fifth timestamp information, the seventh timestamp information, and the The first difference and the second difference determine a frequency deviation between the first device and the second device, and a specific method may be:

Determining, by the second device, a magnitude relationship between the first difference and the second difference;

When the second device determines that the second difference is smaller than the first difference, the second device determines that the frequency deviation is a quotient of the first value and a second value, and the first value is A difference between the time corresponding to the third time stamp information and the time corresponding to the first time stamp information, and the second value is a time value corresponding to the seventh time stamp information and the fifth time stamp information A value obtained by adding a difference between the times to a third value, the third value being a product of a fourth value and a fifth value, and the fourth value being the first difference minus the second difference The obtained value, the fifth value is a difference between a time corresponding to the seventh timestamp information and a time corresponding to the fifth timestamp divided by a time corresponding to the eighth timestamp information and the sixth The value obtained by the difference between the times corresponding to the timestamps;

When the second device determines that the second difference is greater than the first difference, the second device determines that the frequency deviation is a quotient of the first value and a sixth value, and the sixth value A value obtained by subtracting a seventh value from a difference between the time corresponding to the seventh timestamp information and the time corresponding to the fifth timestamp information, where the seventh value is the difference between the eighth value and the fifth value The product value, the eighth value is a value obtained by subtracting the first difference value from the second difference value.

For example, when the first difference is smaller than the second difference, this scenario can be regarded as a message in the second process of frequency synchronization (that is, the second message and the fourth message). (Text) Arrived at the second device early, so the second device needs to wait until the time difference within the mobile network is equal, and then perform the frequency deviation calculation. For example, the first value may be recorded as t8-t5, and the third value may be recorded as [(t6'-t5 ')-(t7'-t8')] * [(t7-t6) / (t7 ' -t6 ')], the second value can be written as t7-t6 + [(t6'-t5')-(t7'-t8 ')] * [(t7-t6) / (t7'-t6')] . For example, the frequency deviation ratio may meet the following formula four:

For example, when the first difference is greater than the second difference, this scenario can be regarded as a message in the second process of frequency synchronization (that is, the second message and the fourth message). (Text) The second device arrives late, so the second device needs to perform a frequency deviation calculation at a time when the delay difference within the mobile network is equal, that is, the corresponding operation described above is performed. For example, the first value may be recorded as t8-t5, and the seventh value may be recorded as [(t7'-t8 ')-(t6'-t5')] * [(t7-t6) / (t7 ' -t6 ')], the sixth value can be recorded as t7-t6-[(t7'-t8')-(t6'-t5 ')] * [(t7-t6) / (t7'-t6') ]. For example, the frequency deviation ratio may conform to the following formula 5:

In an optional implementation manner, when the first difference is equal to the second difference, in this scenario, the absolute delay difference between the two frequency-synchronized message sending and receiving is equal (that is, the time difference within the mobile network). Equal delay). The frequency deviation may be calculated according to the above formula 4, or may be calculated according to the above formula 5. Because when the first difference is equal to the second difference, the difference between the two is zero, so the frequency deviation can be directly calculated by the following formula six:

By adopting the synchronization method provided in the embodiment of the present application, the second device uses the mobile network and Ethernet clock message transmission and reception time to transmit the message initiated by the first device, calculates the frequency deviation between the first device and the second device, and then performs the frequency. Synchronize. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the clock accuracy requirements of industrial plants.

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 2. For example, the first device in FIG. 10 is the above-mentioned UPF and the second device is a UE, or the first device is a UE and the second device is a UPF. Referring to FIG. 10, the specific process of the method may include:

Step 1001: The first device determines first time stamp information, where the first time stamp information is a difference between a time corresponding to the second time stamp information and a time corresponding to the third time stamp information, and the second time stamp information is Master clock information in an Ethernet network, and the third time stamp information is master clock information in a mobile network.

In an optional implementation manner, the first device recognizes a data packet from an Ethernet network (for example, TSN), and the first device recognizes that the format information of the data packet is 0x88f7, It is determined that the data packet is an 802.1AS synchronization data packet. Then, the first device executes step 1001, and a clock synchronization process is initiated at this time.

Optionally, the time corresponding to the second time stamp information may be recorded as T2, the time corresponding to the third time stamp information may be recorded as T1, and the first time stamp information is recorded as T1-T2.

In an optional implementation manner, the first device has two layers of chips, one of which recognizes the time of the mobile network, and the other layer of chips recognizes the time of the Ethernet network, and the first device determines the first In the case of time stamp information, the master clock information in the mobile network and the Ethernet network can be identified through the two-layer chip, and the difference between the two can be determined.

Step 1002: The first device sends a first message to the access device, and the first message carries the first time stamp information.

Optionally, when the first device sends the first message to the access device, the first time stamp information may be carried by synchronization request (sync request) signaling.

In an optional implementation manner, the first message carries the first time stamp information, and a specific implementation manner may be that the first device carries the first time stamp information in the first time stamp. A message is included in a first protocol field. Wherein, optionally, the first protocol field may be an existing protocol field in the first message in the current protocol stack framework; the first protocol field may also be described in the current protocol stack framework Newly added protocol field in the first message.

Step 1003: The access device sends a third message to the second device based on the first message, and the third message carries the first time stamp information.

Optionally, the access device sends a third message to the second device based on the first message. The specific method may be: when the access device detects the first protocol included in the first message, When the first time stamp information is included in the field, the access device encapsulates the first time stamp information into a second protocol field included in the first message, generates the third message, and Sending the third message to the second device.

For example, the first protocol field is the same as the first protocol field in step 1001, and similarly, reference may be made to the related description in step 701. The second protocol field may also be an existing protocol field or a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending a third message to the second device based on the first message is the same as that in step 702 in the embodiment shown in FIG. 7 by the access device to the second device based on the first message. The device sends the third packet with the same principle. For related principles, see step 702. The second protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

Optionally, after the second device receives a third message from the access device, the second device extracts the first time stamp information carried in a second protocol field included in the third message . For example, reference may be made to the conditions n1, n2, and n3 in step 702, and details are not repeatedly described herein.

Step 1004: The second device determines fourth time stamp information, where the fourth time stamp information is a time in the mobile network when the second device receives the third message.

In a possible example, the time corresponding to the fourth timestamp information may be recorded as T2 '.

Step 1005: The second device uses the time corresponding to the fourth timestamp information to add the difference corresponding to the first timestamp information to complete time synchronization.

For example, the specific process in which the second device executes step 1005 may be T2 '+ T1-T2, that is, time synchronization is completed.

Step 1006: The second device sends a second message to the access device, where the second message is used to notify the first device that time synchronization is complete.

Step 1007: The access device sends the second message to the first device.

Among them, the above steps 1006 and 1007 are optional steps, which are shown by dashed lines in FIG. 10. After the steps 1006 and 1007 are performed, the first device may end the transmission of the message after the third message in the existing synchronization process by recognizing that time synchronization has been completed, thereby saving resource consumption.

With the synchronization method provided in the embodiment of the present application, the first device determines the difference between the master clock information in the mobile network and the Ethernet network, and sends the difference to the second device, so that the second device directly uses the difference in the master clock information. Complete clock synchronization. In this method, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario of the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of the industrial plant.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 3 above. method. FIG. 11 shows the structure of the first device. Referring to FIG. 11, the first device includes: a sending unit 1101, a processing unit 1102, and a receiving unit 1103, where:

The sending unit 1101 is configured to send a first message to the access device, where the first message carries first time stamp information, and the first time stamp information is the first device sending the first message Time in the Ethernet network;

A processing unit 1102, configured to determine second time stamp information, where the second time stamp information is a time in a mobile network when the first device sends the first message;

A receiving unit 1103 is configured to receive a second message from the access device, where the second message carries third time stamp information and fourth time stamp information, and the third time stamp information is received by the second device. At the time in the mobile network when the access device sends a third message to the second device based on the first message, the fourth time stamp information is the time when the second device sends the message to the second device. The moment in the mobile network when the access device sends a fourth message; the second message is sent by the access device to the first device based on the fourth message;

The processing unit 1102 is further configured to determine fifth timestamp information and sixth timestamp information, where the fifth timestamp information is in the Ethernet network when the first device receives the second packet. Time, the sixth time stamp information is the time in the mobile network when the first device receives the second message;

The processing unit 1102 is further configured to determine according to the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, and the sixth timestamp information. Seventh time stamp information;

The sending unit 1101 is further configured to forward the seventh timestamp information to the second device through the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In an optional implementation manner, the processing unit 1102, in accordance with the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, and When the sixth time stamp information determines the seventh time stamp information, it is specifically used to:

Determining a round-trip transmission time between the first device and the second device according to the second time stamp information, the third time stamp information, the fourth time stamp information, and the sixth time stamp information Delay difference

Calculate the sum of the time corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the seventh time stamp information.

In an optional implementation manner, the processing unit 1102 is further configured to extract the first protocol included in the second packet after the receiving unit 1103 receives the second packet from the access device. The third timestamp information and the fourth timestamp information carried in the fields.

In an optional implementation manner, when the first device is a user plane network element, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; when the first device is a terminal device The first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 3 above. method. Referring to FIG. 12, the access device includes a receiving unit 1201 and a sending unit 1202, where:

The receiving unit 1201 is configured to receive a first message from a first device, where the first message carries first timestamp information, and the first timestamp information is the first message sent by the first device. Time in the Ethernet network;

A sending unit 1202, configured to send a third message to the second device based on the first message, where the third message carries the first time stamp information;

The receiving unit 1201 is further configured to receive a fourth message from the second device, where the fourth message carries third time stamp information and fourth time stamp information, and the third time stamp information is The time in the mobile network when the second device receives the third message, and the fourth time stamp information is the time when the second device sends the fourth message to the access device. Moments in mobile networks;

The sending unit 1202 is further configured to send a second message to the first device, where the second message carries the third time stamp information and the fourth time stamp information;

The receiving unit 1201 is further configured to receive seventh timestamp information from the first device;

The sending unit 1202 is further configured to send the seventh timestamp information to the second device;

In an optional implementation manner, the access device further includes a processing unit, configured to detect when the second protocol field included in the fourth packet carries third time stamp information and fourth time stamp information. , Encapsulate the third timestamp information and the fourth timestamp information into a first protocol field included in the fourth message to generate the second message; the sending unit 1202 is sending the When the first device sends the second message, it is specifically configured to: when the processing unit detects that the second protocol field included in the fourth message carries third time stamp information and fourth time stamp information, The third timestamp information and the fourth timestamp information are encapsulated into a first protocol field included in the fourth message, and after the second message is generated, the first device sends the first time stamp to the first device. Two messages.

In an optional implementation manner, when the first device is a user plane network element, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field, and the first protocol field is general GTP field of packet radio service GPRS tunneling protocol;

When the first device is a terminal device, the second protocol field is a GTP field, and the first protocol field is an SDAP field or a PDCP field.

Based on the above embodiments, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 3 above. method. Referring to FIG. 13, the second device includes a receiving unit 1301, a processing unit 1302, and a sending unit 1303, where:

The receiving unit 1301 is configured to receive a third message from the access device, where the third message carries first time stamp information, and the first time stamp information is in an Ethernet network when the first device sends the first message. Time; the third message is sent by the access device based on the first message after receiving the first message from the first device; wherein the first device is a user plane A network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element;

The processing unit 1302 is configured to determine third time stamp information and eighth time stamp information, where the third time stamp information is a time in the mobile network when the second device receives the third message, so The eighth time stamp information is a time in the Ethernet network when the second device receives the third message;

A sending unit 1303 is configured to send a fourth message to the access device, where the fourth message carries the third time stamp information and the fourth time stamp information, and the fourth time stamp information is the The time in the mobile network when the second device sends the fourth message to the access device;

The processing unit 1302 is further configured to determine ninth time stamp information, where the ninth time stamp information is a time in the Ethernet network when the second device sends the fourth message to the access device. ;

The receiving unit 1301 is further configured to receive seventh timestamp information from the access device;

The processing unit 1302 is further configured to determine the first device and the first device according to the first time stamp information, the eighth time stamp information, the ninth time stamp information, and the seventh time stamp information. Time deviation between the second devices, and time synchronization is performed according to the time deviation.

In an optional implementation manner, the processing unit 1302 is further configured to determine, according to the seventh timestamp information, a time in the Ethernet network when the first device receives a second packet, so that The second message is sent by the access device to the first device based on the fourth message.

In an optional implementation manner, when the fourth message carries the third time stamp information and the fourth time stamp information, the sending unit 1303 is specifically configured to:

Carrying the third timestamp information and the fourth timestamp information in a second protocol field included in the fourth message.

In an optional implementation manner, when the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 7 above. method. Referring to FIG. 14, the first device includes: a sending unit 1401 and a receiving unit 1402, where:

The sending unit 1401 is configured to send a first message to the access device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is sent by the first device The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message;

The receiving unit 1402 is configured to receive a second message from the access device, and determine third time stamp information and fourth time stamp information, where the third time stamp information is the first device receiving the first time stamp. The time when the two messages are in the Ethernet network, and the fourth time stamp information is the time in the mobile network when the first device receives the second message;

The sending unit 1401 is further configured to send the third time stamp information and the fourth time stamp information to the access device. The first time stamp information, the second time stamp information, the The third time stamp information and the fourth time stamp information are used for time synchronization;

In an optional implementation manner, when the first message carries the second time stamp information, the sending unit 1401 is specifically configured to carry the second time stamp information in the first message. A message is included in a first protocol field.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 7 above. method. See also FIG. 12. The access device includes: a receiving unit 1201 and a sending unit 1202, where:

A receiving unit 1201 is configured to receive a first message from a first device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is sent by the first device The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message;

A sending unit 1202, configured to send a third message to the second device based on the first message, where the third message carries the first time stamp information and the second time stamp information;

The receiving unit 1201 is further configured to receive a fourth message from the second device, and send a second message to the first device based on the fourth message;

The receiving unit 1201 is further configured to receive third time stamp information and fourth time stamp information from the first device, where the third time stamp information is when the first device receives the second message. The time in the Ethernet network, the fourth time stamp information is the time in the mobile network when the first device received the second message;

The sending unit 1202 is further configured to send the third timestamp information and the fourth timestamp information to the second device. The first timestamp information, the second timestamp information, all The third time stamp information and the fourth time stamp information are used for time synchronization;

In an optional implementation manner, the access device further includes a processing unit, configured to detect that the first protocol field included in the first packet includes the second time stamp information, and The access device encapsulates the second timestamp information into a second protocol field included in the first message, and generates the third message. The sending unit 1202, based on the first message direction, When the second device sends the third message, the second device is specifically configured to: when the processing unit detects that the second protocol time stamp information is included in a first protocol field included in the first message, The access device encapsulates the second time stamp information into a second protocol field included in the first message, and generates the third message, and then sends the third message to the second device. .

In an optional implementation manner, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field, and The second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field. When the first device is a terminal device and the second device is a user plane network element, the first protocol field is an SDAP field or A PDCP field, and the second protocol field is a GTP field.

Based on the above embodiments, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 7 above. method. Similarly, referring to FIG. 13, the second device includes a receiving unit 1301, a processing unit 1302, and a sending unit 1303, where:

The receiving unit 1301 is configured to receive a third message from the access device, where the third message carries the first time stamp information and the second time stamp information, and the first time stamp information is sent by the first device to the first device. The message is the time in the Ethernet network; the second time stamp information is the time in the mobile network when the first device sends the first message; the third message is the time when the access device is The first device sends the first message based on the first message after receiving the first message; wherein the first device is a user plane network element and the second device is a terminal device; or A device is a terminal device and the second device is a user plane network element;

The processing unit 1302 is configured to determine fifth timestamp information and sixth timestamp information, where the fifth timestamp information is a time in the Ethernet network when the second device receives the third packet, so that The sixth time stamp information is a time in the mobile network when the second device receives the third message;

A sending unit 1303 is configured to send a fourth message to the access device, and determine seventh time stamp information and eighth time stamp information, where the seventh time stamp information is the second device accessing the access device. The time in the Ethernet network when the device sends the fourth message, and the eighth timestamp information is the time in the mobile network when the second device sends the fourth message to the access device time;

The receiving unit 1301 is further configured to receive third timestamp information and fourth timestamp information from the access device, where the third timestamp information is at the time when the first device receives the second message. The time in the Ethernet network, the fourth time stamp information is the time in the mobile network when the first device received the second message; the second message is the access device Sent to the first device based on the fourth message;

The processing unit 1302 is further configured to: according to the first time stamp information, the second time stamp information, the sixth time stamp information, the eighth time stamp information, the third time stamp information, The fourth timestamp information, the fifth timestamp information, and the seventh timestamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation .

In an optional implementation manner, the processing unit 1302, in accordance with the first time stamp information, the second time stamp information, the sixth time stamp information, the eighth time stamp information, When the third time stamp information, the fourth time stamp information, the fifth time stamp information, and the seventh time stamp information determine a time deviation between the first device and the second device, Specifically used for:

Determining a round-trip transmission time between the first device and the second device according to the second time stamp information, the sixth time stamp information, the eighth time stamp information, and the fourth time stamp information Delay difference

Determining the first device and the first device according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, and the round-trip transmission delay difference value Time deviation between the second devices.

In an optional implementation manner, the processing unit 1302, in accordance with the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, and When the round-trip transmission delay difference determines a time deviation between the first device and the second device, it is specifically used to:

Determining ninth time stamp information, where the ninth time stamp information is a sum of a time corresponding to the third time stamp information and the round-trip transmission delay difference value;

Determining a time offset between the first device and the second device according to the first time stamp information, the fifth time stamp information, the seventh time stamp information, and the ninth time stamp information.

In an optional implementation manner, the processing unit 1302 is further configured to: after the receiving unit 1301 receives a third message from the access device, extract a second protocol field included in the third message The second timestamp information carried in.

In an optional implementation manner, when the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the second device is a user plane network The second protocol field is a general packet radio service GPRS tunneling protocol GTP field.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 8 above. method. Referring to FIG. 15, the first device includes: a sending unit 1501 and a processing unit 1502, where:

The sending unit 1501 is configured to send a first message to the access device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is sent by the first device The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message;

The sending unit 1501 is further configured to send a second message to the access device, where the second message carries third time stamp information and fourth time stamp information, and the third time stamp information is the first time stamp information. The time in the Ethernet network when a device sends the second message, and the fourth time stamp information is the time in the mobile network when the first device sends the second message;

A processing unit 1502, configured to control the sending unit 1501 to send data;

In an optional implementation manner, when the first message carries the second time stamp information, the sending unit 1501 is specifically configured to carry the second time stamp information in the first message. A message is included in a first protocol field.

In an optional implementation manner, when the fourth message carries the fourth timestamp information, the sending unit 1501 is specifically configured to carry the fourth timestamp information on the second The message includes a second protocol field.

In an optional implementation manner, when the first device is a user plane network element, the second protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; when the first device is a terminal device The second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.

Based on the above embodiment, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 8 above. method. See also FIG. 12. The access device includes: a receiving unit 1201 and a sending unit 1202, where:

The receiving unit 1201 is further configured to receive a second message from the first device, where the second message carries third time stamp information and fourth time stamp information, and the third time stamp information is The time in the Ethernet network when the first device sends the second message, and the fourth time stamp information is the time in the mobile network when the first device sends the second message;

The sending unit 1202 is further configured to send a fourth message to the second device based on the second message, where the fourth message carries the third time stamp information and the fourth time stamp information;

In an optional implementation manner, the access device further includes a processing unit, configured to detect that the first protocol field included in the first packet includes the second time stamp information, and The access device encapsulates the second timestamp information into a third protocol field included in the first message, and generates the third message. The sending unit 1202, based on the first message direction, When the second device sends the third message, the second device is specifically configured to: when the processing unit detects that the second protocol timestamp information is included in the first protocol field included in the first message, the access device Encapsulate the second time stamp information into a third protocol field included in the first message, and generate the third message, and then send the third message to the second device.

In an optional implementation manner, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field, and The third protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the first protocol field is an SDAP field or A PDCP field, and the third protocol field is a GTP field.

In an optional implementation manner, the access device further includes a processing unit, configured to detect that the second protocol field included in the second packet includes the fourth time stamp information, and The access device encapsulates the fourth timestamp information into a fourth protocol field of the second message to generate the fourth message; and the sending unit 1202, based on the second message, sends the When the two devices send the fourth message, the second device is specifically configured to: when the processing unit detects that the fourth time stamp information is included in a second protocol field included in the second message, the access device sends The fourth time stamp information is encapsulated into a fourth protocol field of the second message, and after the fourth message is generated, the fourth message is sent to the second device.

In an optional implementation manner, when the first device is a user plane network element and the second device is a terminal device, the second protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field, and The fourth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the second protocol field is an SDAP field or A PDCP field, and the fourth protocol field is a GTP field.

Based on the above embodiments, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 8 above. method. Referring to FIG. 16, the second device includes a receiving unit 1601 and a processing unit 1602, where:

The receiving unit 1601 is configured to receive a third message from the access device, where the third message carries the first time stamp information and the second time stamp information, and the first time stamp information is sent by the first device to The time in the Ethernet network when the access device sends the first message, and the second time stamp information is the time in the mobile network when the first device sends the first message to the access device; The third message is sent by the access device to the second device based on the first message; wherein the first device is a user plane network element and the second device is a terminal device Or, the first device is a terminal device and the second device is a user plane network element;

The processing unit 1602 is configured to determine fifth timestamp information and sixth timestamp information, where the fifth timestamp information is a time in the Ethernet network when the second device receives the third packet, and the first The six timestamp information is the time in the mobile network when the second device receives the third message;

The receiving unit 1601 is configured to receive a fourth message from the access device, where the fourth message carries third timestamp information and fourth timestamp information, and the third timestamp information is sent by the first device to The time in the Ethernet network when the access device sends the second message, and the fourth time stamp information is the time in the mobile network when the first device sends the second message to the access device; The fourth message is sent by the access device to the second device based on the second message;

The processing unit 1602 is further configured to determine seventh time stamp information and eighth time stamp information, where the seventh time stamp information is a time in the Ethernet network when the second device receives the fourth packet, The eighth time stamp information is a time in the mobile network when the second device receives the fourth message;

The processing unit 1602 is further configured to: according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, The sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a frequency deviation between the first device and the second device, and perform frequency synchronization according to the frequency deviation .

In an optional implementation manner, the processing unit 1602, in accordance with the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, When the fifth time stamp information, the sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a frequency deviation between the first device and the second device, Specifically used for:

Determining a first difference between a time corresponding to the sixth time stamp information and a time corresponding to the second time stamp information, and determining a time corresponding to the eighth time stamp information and the fourth time stamp information The second difference in time;

Determining the first time stamp information according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, the first difference value and the second difference value. A frequency deviation between a device and the second device.

In an optional implementation manner, the processing unit 1602, in accordance with the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, When the first difference value and the second difference value determine a frequency deviation between the first device and the second device, the method is specifically configured to:

Determine the magnitude relationship between the first difference and the second difference;

When it is determined that the second difference value is smaller than the first difference value, it is determined that the frequency deviation is a quotient of the first value and a second value, and the first value is a time instant corresponding to the third time stamp information and A difference between the times corresponding to the first timestamp information, and the second value is obtained by adding a third value to the difference between the times corresponding to the seventh timestamp information and the times corresponding to the fifth timestamp information The third value is a product of a fourth value and a fifth value, the fourth value is a value obtained by subtracting the second difference from the first difference, and the fifth value is A difference between the time corresponding to the seventh timestamp information and the time corresponding to the fifth timestamp divided by the difference between the time corresponding to the eighth time stamp information and the time corresponding to the sixth timestamp value;

When it is determined that the second difference value is greater than the first difference value, it is determined that the frequency deviation is a quotient of the first value and a sixth value, and the sixth value is a value corresponding to the seventh time stamp information. A value obtained by subtracting a seventh value from a time difference corresponding to the fifth time stamp information, the seventh value being a product of an eighth value and the fifth value, and the eighth value being A value obtained by subtracting the first difference from the second difference.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method provided in the embodiment shown in FIG. 10 . Referring to FIG. 17, the first device includes a processing unit 1701 and a sending unit 1702, where:

The processing unit 1701 is configured to determine first time stamp information, where the first time stamp information is a difference between a time corresponding to the second time stamp information and a time corresponding to the third time stamp information, and the second time stamp information is Master clock information in an Ethernet network, and the third time stamp information is master clock information in a mobile network;

A sending unit 1702, configured to send a first message to the access device, where the first message carries the first time stamp information;

In an optional implementation manner, when the first message carries the first timestamp information, the sending unit 1702 is specifically configured to carry the first timestamp information in the first message. The message includes the first protocol field.

In an optional implementation manner, the first device further includes a receiving unit, configured to receive a second message from the access device, and the second message is used to notify the first device of time synchronization. completed.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method provided by the embodiment shown in FIG. 10 . See also FIG. 12. The access device includes: a receiving unit 1201 and a sending unit 1202, where:

The receiving unit 1201 is configured to receive a first message from a first device, where the first message carries first time stamp information, and the first time stamp information is a time corresponding to the second time stamp information and a third time. A time difference corresponding to the stamp information, the second time stamp information is master clock information in an Ethernet network, and the third time stamp information is master clock information in a mobile network;

In an optional implementation manner, the access device further includes a processing unit, configured to detect that, when the first protocol field included in the first packet includes the first time stamp information, the The access device encapsulates the first timestamp information into a second protocol field included in the first message, and generates the third message. The sending unit 1202, based on the first message direction, When the second device sends the third message, it is specifically configured to: when the processing unit detects that the first time stamp information is included in the first protocol field included in the first message, the access device Encapsulate the first time stamp information into a second protocol field included in the first message, and generate the third message, and then send the third message to the second device.

In an optional implementation manner, when the first device is a user plane network element and the second device is a terminal device, the first protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field, and The second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; when the first device is a terminal device and the second device is a user plane network element, the first protocol field is an SDAP field or A PDCP field, and the second protocol field is a GTP field.

In an optional implementation manner, the receiving unit 1201 is further configured to receive a second message from the second device, and the sending unit 1202 is further configured to forward the second message to the first device. A device, the second message is used to notify the first device that time synchronization is completed.

Based on the above embodiments, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method provided by the embodiment shown in FIG. 10 . Referring to FIG. 16, the second device includes a receiving unit 1601 and a processing unit 1602, where:

The receiving unit 1601 is configured to receive a third message from the access device, where the third message carries first time stamp information, and the first time stamp information is a time corresponding to the second time stamp information and a third time. A time difference corresponding to the stamp information, the second time stamp information is master clock information in an Ethernet network, the third time stamp information is master clock information in a mobile network, and the third message is the Sent by the access device based on a first message sent by the first device to the access device; wherein the first device is a user plane network element and the second device is a terminal Device, or the first device is a terminal device and the second device is a user plane network element;

A processing unit 1602, configured to determine fourth time stamp information, where the fourth time stamp information is a time in the mobile network when the second device receives the third message;

The processing unit 1602 is further configured to use the time corresponding to the fourth timestamp information to add a difference corresponding to the first timestamp information to complete time synchronization.

In an optional implementation manner, the processing unit 1602 is further configured to: after the receiving unit 1601 receives a third message from the access device, extract a second message included in the third message The first time stamp information carried in the protocol field.

In an optional implementation manner, the second device further includes a sending unit, configured to send a second message to the access device, and the second message is used to notify the first device of time synchronization. completed.

It should be noted that the division of the units in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. The functional units in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially a part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium , Including a number of instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

Based on the above embodiments, an embodiment of the present application further provides a first device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 3. Referring to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 may be a central processing unit (CPU), a network processor (NP), a combination of a CPU and an NP, and so on. The processor 1802 may further include a hardware chip. The above hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof. When the processor 1802 implements the foregoing functions, it may be implemented by hardware, or of course, by executing corresponding software by hardware.

The transceiver 1801, the processor 1802, and the memory 1803 are connected to each other. Optionally, the transceiver 1801, the processor 1802, and the memory 1803 are connected to each other through a bus 1804; the bus 1804 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard Structure (Extended Industry, Standard Architecture, EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used in FIG. 18, but it does not mean that there is only one bus or one type of bus.

The transceiver 1801 is configured to communicate and interact with other devices.

The processor 1802 is configured to implement the synchronization method shown in FIG. 3. For details, refer to the related description in the embodiment shown in FIG. 3, and details are not described herein again.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 3.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 3. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 may be a CPU, an NP, or a combination of a CPU and an NP. The processor 1902 may further include a hardware chip. The aforementioned hardware chip may be an ASIC, a PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof. When the processor 1902 implements the foregoing functions, it may be implemented by hardware, and of course, it may also be implemented by hardware executing corresponding software.

The transceiver 1901, the processor 1902, and the memory 1903 are connected to each other. Optionally, the transceiver 1901, the processor 1902, and the memory 1903 are connected to each other through a bus 1904; the bus 1904 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard Structure (Extended Industry, Standard Architecture, EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only a thick line is used in FIG. 19, but it does not mean that there is only one bus or one type of bus.

The transceiver 1901 is configured to communicate and interact with other devices.

The processor 1902 is configured to implement the synchronization method shown in FIG. 3. For details, refer to the related description in the embodiment shown in FIG. 3, and details are not described herein again.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 3.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 3. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 may be a CPU, an NP, or a combination of a CPU and an NP, and so on. The processor 2002 may further include a hardware chip. The aforementioned hardware chip may be an ASIC, a PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof. When the processor 2002 realizes the functions described above, it can be implemented by hardware, and of course, it can also be implemented by hardware executing corresponding software.

The transceiver 2001, the processor 2002, and the memory 2003 are connected to each other. Optionally, the transceiver 2001, the processor 2002, and the memory 2003 are connected to each other through a bus 2004; the bus 2004 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard Structure (Extended Industry, Standard Architecture, EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used in FIG. 20, but it does not mean that there is only one bus or one type of bus.

The transceiver 2001 is configured to perform communication interaction with other devices.

The processor 2002 is configured to implement the synchronization method shown in FIG. 3. For details, refer to the related description in the embodiment shown in FIG. 3, and details are not described herein again.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 3.

Based on the above embodiments, an embodiment of the present application further provides a first device, where the first device is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 7. Referring also to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 may be a CPU, an NP, or a combination of a CPU and an NP, and so on. The processor 1802 may further include a hardware chip. The aforementioned hardware chip may be an ASIC, a PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof. When the processor 1802 implements the foregoing functions, it may be implemented by hardware, and of course, it may also be implemented by hardware executing corresponding software.

The processor 1802 is configured to implement the synchronization method shown in FIG. 7. For details, refer to the related description in the embodiment shown in FIG. 7, and details are not described herein again.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 7.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to the communication system shown in FIG. 1 or FIG. 2 and is used to implement the synchronization method shown in FIG. 7. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 is configured to implement the synchronization method shown in FIG. 7. For details, refer to related descriptions in the embodiment shown in FIG. 7, and details are not described herein again.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 7.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 7. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 may be a CPU, an NP, or a combination of a CPU and an NP, and so on. The processor 2002 may further include a hardware chip. The aforementioned hardware chip may be an ASIC, a PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof. When the processor 2002 realizes the above functions, it can be implemented by hardware, and of course, it can also be implemented by hardware executing corresponding software.

The processor 2002 is configured to implement the synchronization method shown in FIG. 7. For details, refer to the related description in the embodiment shown in FIG. 7, and details are not described herein again.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 7.

Based on the above embodiments, an embodiment of the present application further provides a first device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 8. Referring also to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 may be a CPU, an NP, or a combination of a CPU and an NP, and so on. The processor 1802 may further include a hardware chip. The aforementioned hardware chip may be an ASIC, a PLD, or a combination thereof. The PLD may be a CPLD, an FPGA, a GAL, or any combination thereof. When the processor 1802 implements the foregoing functions, it may be implemented by hardware, or of course, by executing corresponding software by hardware.

The processor 1802 is configured to implement the synchronization method shown in FIG. 8. For details, refer to the related description in the embodiment shown in FIG. 8, and details are not described herein again.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 8.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 8. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 is configured to implement the synchronization method shown in FIG. 8. For details, refer to the related description in the embodiment shown in FIG. 8, and details are not described herein again.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 8.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 8. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 is configured to implement the synchronization method shown in FIG. 8. For details, refer to the related description in the embodiment shown in FIG. 8, and details are not described herein again.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 8.

Based on the above embodiments, an embodiment of the present application further provides a first device, where the first device is applied to the communication system shown in FIG. 1 or FIG. 2 and is used to implement the synchronization method shown in FIG. Referring also to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 is configured to implement the synchronization method shown in FIG. 10. For details, refer to the related description in the embodiment shown in FIG. 10, and details are not described herein again.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 10.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 10. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 is configured to implement the synchronization method shown in FIG. 10. For details, refer to the related description in the embodiment shown in FIG. 10, and details are not described herein again.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 10.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 10. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 is configured to implement the synchronization method shown in FIG. 10. For details, refer to the related description in the embodiment shown in FIG. 10, and details are not described herein again.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 10.

The embodiment of the present application also provides another synchronization method, which is also applicable to the communication system shown in FIG. 1 and FIG. 2. For example, the first device in FIG. 21 is the above-mentioned UPF and the second device is a UE, or the first device is a UE and the second device is a UPF. Referring to FIG. 21, the specific process of the method includes:

Step 2101: The first device sends a first message to the access device, and determines first time stamp information and second time stamp information; the first time stamp information is the first device sending the first message Time in the Ethernet network, the second time stamp information is the time in the mobile network when the first device sends the first message.

For example, FIG. 22 shows a schematic diagram of sending and receiving messages during synchronization between the first device and the second device. Among them, the solid line in FIG. 22 indicates the transmission of the message in the Ethernet network, and the dotted line indicates the transmission of the message in the mobile network. It should be understood that the solid line and the dotted line in FIG. 22 indicate the same message Transmission.

For example, the time corresponding to the first time stamp information in step 2101 is recorded as t9 in FIG. 22, and the time corresponding to the second time stamp information is recorded as t9 'in FIG.

Step 2102: The access device forwards the first message to a second device.

Step 2103: The second device determines fifth time stamp information and sixth time stamp information. The fifth time stamp information is a time in the Ethernet network when the second device receives the first packet. The sixth time stamp information is a time in the mobile network when the second device receives the first message.

For example, in FIG. 22, the time corresponding to the fifth time stamp information is denoted as t10, and the time corresponding to the sixth time stamp information is denoted as t10 '.

Step 2104: The first device sends a second message to the access device, and the second message carries the first time stamp information and the second time stamp information.

Optionally, a flag may be carried in the second message, and the flag is used to indicate that the second message carries time stamp information indicating a time in the mobile network.

In an optional implementation manner, the second message carrying the second timestamp information may be specifically implemented as follows: the first device carries the second timestamp information in the second message. The message includes the first protocol field. Wherein, optionally, the first protocol field may be an existing protocol field in the second message in the current protocol stack framework; the first protocol field may also be described in the current protocol stack framework Newly added protocol field in the second message. Optionally, when the second packet also carries a flag, the flag may also be carried in the first protocol field.

Optionally, the first protocol field may be the same as the first protocol field in step 701 in the embodiment shown in FIG. 7. For a detailed description of the first protocol field, see the first protocol field in step 701. Relevant descriptions are not repeated here.

Step 2105: The access device sends a sixth message to the second device based on the second message, and the sixth message carries the first time stamp information and the second time stamp information. .

In an optional implementation manner, the specific method for the access device to send a sixth message to the second device based on the second message may be: when the access device detects the second message When the first protocol field included in the message carries the second time stamp information, encapsulating the second time stamp information into the second protocol field of the second message to generate the sixth message, And sending the sixth message to the second device. At this time, the second protocol field of the sixth message carries the second time stamp information.

For example, the first protocol field is the same as the first protocol field in step 2104, and similarly, reference may be made to the related description in step 701. The second protocol field may also be an existing protocol field or a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending a sixth message to the second device based on the second message is the same as that in step 702 in the embodiment shown in FIG. 7 by the access device to the first device. The principle that the second device sends the third packet is the same. For related principles, see step 702. The second protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

In an optional implementation manner, after the second device receives the sixth message from the access device, the second device extracts the second timestamp carried in a second protocol field included in the sixth message. information. For example, for a specific method, reference may be made to situations n1, n2, and n3 in step 702, and details are not described herein again.

Step 2106: The second device sends a third message to the access device, and determines seventh time stamp information, where the seventh time stamp information is Ethernet when the second device sends the third message. Moments in the network.

For example, in FIG. 22, the time corresponding to the seventh timestamp information is recorded as t11.

Step 2107: The access device forwards the third message to the first device.

Step 2108: The first device determines third time stamp information, where the third time stamp information is a time in the Ethernet network when the first device receives the third message.

For example, in FIG. 22, the time corresponding to the third time stamp information is recorded as t12.

Step 2109: The first device sends a fourth message to the access device, and determines fourth timestamp information; the fourth timestamp information is Ethernet when the first device sends the fourth message. At the time in the network, the fourth message carries the third time stamp information.

For example, in FIG. 22, the time corresponding to the fourth time stamp information is denoted as t13.

Step 2110: The access device forwards the fourth message to the second device.

Step 2111: The second device determines eighth time stamp information, where the eighth time stamp information is a time in the Ethernet network when the second device receives the fourth message.

For example, in FIG. 22, the time corresponding to the eighth time stamp information is denoted as t14.

Step 2112: The first device sends a fifth message to the access device, and the fifth message carries the fourth time stamp information.

Step 2113: The access device forwards the fifth message to the second device.

Step 2114: The second device according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, The sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation.

In an optional implementation manner, the specific method when the second device executes step 2114 may be:

The second device according to the second time stamp information (t9 '), the third time stamp information (t12), the sixth time stamp information (t10'), and the seventh time stamp information (t11 ) And the eighth timestamp information (t14) determine the ninth timestamp information;

Deleting, by the second device, the fourth timestamp information (t13), and determining, according to the ninth timestamp information, the time in the Ethernet network when the first device sends the fourth message to the access device. time;

The second device according to the first time stamp information (t9), the third time stamp information (t12), the fifth time stamp information (t10), the seventh time stamp information (t11), The eighth time stamp information (t14) and the ninth time stamp information determine a time offset between the first device and the second device.

For example, in an existing fixed network (Ethernet network), the time offset offset3 between the master and slaver (here, the first device and the second device) may meet the following formula 7:

Wherein, t is the time in the Ethernet network when the first device sends the fourth message to the access device, and t is t13 in the existing fixed network.

In this application, the clock synchronization between the first device and the second device that has been implemented inside the mobile network may be used to calculate the relationship between the first device and the second device in the mobile network and Ethernet network docking scenario. The time deviation can be calculated, for example, by the following formulas 8 and 9:

t10-t9 = offset4 + delay3 formula eight;

t10'-t9 '= offset5 + delay3 formula 9;

Among them, formula 8 represents the time relationship in the Ethernet network, offset4 is the time deviation between the first device and the second device in the Ethernet network; formula 9 represents the time relationship in the mobile network, and offset5 is the time relationship in the mobile network A time deviation between the first device and the second device; delay3 is a transmission delay from the first device to the second device.

Due to the internal clock synchronization in the mobile network, the value of the above offset5 is 0, so that delay3 = t10'-t9 'can be obtained, and offset4 = t10-t9-t10' + t9 '. Then let offset3 = offset4, then we get:

Therefore, it can be sorted and obtained: t = t12-t11 + t14-2 (t10'-t9 '), and the t obtained at this time is the ninth time stamp information, that is, the time corresponding to the ninth time stamp information is: t12-t11 + t14-2 (t10'-t9 ').

After the second device obtains the ninth time stamp information, the second device treats the ninth time stamp information as the fourth time stamp information (t13) in the prior art. Optionally, the second device can obtain the time offset between the first device and the second device, which can meet the following formula X:

The above formula 10 can be regarded as obtained by the second device replacing the t with the ninth timestamp information in the above formula 2, that is, the second device uses the ninth timestamp information as cash. Some t13 can be obtained.

By adopting the synchronization method provided in the embodiment of the present application, the influence of the transmission delay between the first device and the second device can be avoided, so that the docking scenario between the mobile network and the Ethernet network can be implemented to meet the time accuracy requirements of industrial plants.

FIG. 23 is a working schematic diagram of another communication system to which the synchronization method according to the embodiment of the present application is applicable. The message in FIG. 23 may be the same as the message in the diagram shown in FIG. 2. For details, refer to the related description in FIG. 2.

The master clock device in the Ethernet network is a PLC, and the PLC determines the master clock in the Ethernet network. FIG. 23 shows that the master clock in the Ethernet synchronization domain is T1. In the Ethernet network synchronization domain, the UE and the UPF are regarded as two adjacent nodes, and the UE and the UPF are devices in a master and slave transmission path. When performing clock synchronization, the slave needs to perform clock synchronization according to the master clock information of the master.

In the mobile network synchronization domain, the master clock device may refer to the related description in FIG. 2. The master clock device determines the master clock in the mobile network. FIG. 23 shows that the master clock in the mobile network synchronization domain is T2. Correspondingly, there are other multi-hop devices between the UE and the UPF that are adjacent nodes in the Ethernet network, such as RAN. However, the current clock synchronization in the mobile network has been implemented, so the clock synchronization in the Ethernet network can be performed according to the clock synchronization in the mobile network.

It should be noted that the UE in FIG. 23 is only an example of a terminal device, and the UE may also be replaced with another terminal device (for example, the mobile robot and the sensor 2 in FIG. 1); the UPF is only used as a type of user plane network element. For example, the UPF may also be replaced by other user plane network elements, which is not limited in this application.

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 23. For example, the first device in FIG. 24 is a UPF and the second device is a UE, or the first device is a UE and the second device is a UPF; the third device is a master and the fourth device is slaver. Referring to FIG. 24, the specific process of the method includes:

Step 2401, the first device receives a first message from a third device, and determines first time stamp information, where the first time stamp information is in the mobile network when the first device receives the first message. time.

For example, FIG. 25 shows a schematic diagram of message transmission and reception during synchronization between the third device and the fourth device.

For example, the time corresponding to the first time stamp information is recorded as t16 in FIG. 25.

The clock synchronization process is initiated by a third device, and the trigger condition of the clock synchronization process initiated by the third device is the same as the principle described in step 301 in the embodiment shown in FIG. 3, which can be referred to each other and will not be repeated here.

Step 2402: The first device sends the first message to an access device.

Step 2403: The access device forwards the first message to a second device.

Step 2404: The second device sends the first message to a fourth device, and determines fifth time stamp information, where the fifth time stamp information is that the second device sends the fourth device to the fourth device. The first message is the time in the mobile network.

For example, the time corresponding to the fifth time stamp information may be recorded as t17 in FIG. 25.

After that, the fourth device determines the time in the Ethernet network when the first message sent by the second device is received, for example, t18 shown in FIG. 25.

Step 2405: The first device receives a second packet from the third device.

The second message carries the time when the third device sends the first message, for example, t15 shown in FIG. 25.

Step 2406: The first device sends a third message to the access device based on the second message, and the third message carries the first time stamp information. The third packet also carries t15.

Optionally, a flag may be carried in the third message, and the flag is used to indicate that the third message carries time stamp information indicating a time in the mobile network.

In an optional implementation manner, the third packet carries the first timestamp information, and a specific implementation manner may be: the first device carries the first timestamp information in the first The three messages include the first protocol field. Wherein, optionally, the first protocol field may be an existing protocol field in the third message in the current protocol stack framework; the first protocol field may also be described in the current protocol stack framework Newly added protocol field in the third message. Optionally, when the third packet also carries a flag, the flag may also be carried in the first protocol field.

In an optional implementation manner, the third message may be generated by the first device encapsulating the first time stamp information into a first protocol field of the second message.

Step 2407: The access device sends a ninth message to the second device based on the third message; the ninth message carries first time stamp information.

Specifically, the ninth message also carries t15.

In an optional implementation manner, the access device sends a ninth message to the second device based on the third message, and a specific method may be: when the access device detects the first When the first protocol field included in the three messages carries the first time stamp information, the first time stamp information is encapsulated into a fourth protocol field of the third message to generate the ninth message And sending the ninth message to the second device. At this time, the fourth protocol field of the ninth message carries the first time stamp information.

For example, the first protocol field is the same as the first protocol field in step 2406, and similarly, reference may be made to the related description in step 701. The fourth protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending the ninth message to the second device based on the third message is the same as that of the access device in step 702 in the embodiment shown in FIG. The principle that the second device sends the third packet is the same. For related principles, see step 702. The fourth protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

In an optional implementation manner, after the second device receives the ninth message from the access device, the second device extracts the first time stamp information carried in a fourth protocol field included in the ninth message. . For example, for a specific method, reference may be made to situations n1, n2, and n3 in step 702, and details are not described herein again.

Step 2408: The second device sends a twelfth message to the fourth device based on the ninth message.

In an implementation manner, when the second device executes step 2408, the specific method may be: the second device adds the first timestamp in the fourth protocol field in the ninth message. The information is deleted, and the twelfth message is generated. At this time, the twelfth message only carries t15.

Step 2409: The second device receives a fourth message from the fourth device, and determines sixth time stamp information. The sixth time stamp information is when the second device receives the fourth message. Moments in mobile networks.

The fourth device records the time in the Ethernet network when the fourth packet is sent, for example, t19 in FIG. 25.

For example, the time corresponding to the sixth time stamp information is recorded as t20 in FIG. 25.

Step 2410: The second device sends the fourth message to the access device.

Step 2411: The access device sends the fourth message to the first device.

Step 2412: The first device sends the fourth message to the third device, and determines second time stamp information, where the second time stamp information is sent by the first device to the third device. The fourth message is a time in a mobile network.

For example, the time corresponding to the second time stamp information is recorded as t21 in FIG. 25.

The third device records the time in the Ethernet network when the fourth message is received, such as t22 shown in FIG. 25.

Step 2413: The first device receives a fifth message from the third device, and determines third time stamp information. The third time stamp information is when the first device receives the fifth message. Moments in mobile networks.

The third device records a time in the Ethernet network when the fifth message is sent, for example, t23 in FIG. 25.

For example, the time corresponding to the third time stamp information may be recorded as t24 in FIG. 25.

Step 2414: The first device sends a sixth message to the access device based on the fifth message, and the sixth message carries the second time stamp information.

The sixth packet also carries t22.

Optionally, a flag may be carried in the sixth message, and the flag is used to indicate that the sixth message carries time stamp information indicating a time in a mobile network.

In an optional implementation manner, the sixth message carries the second timestamp information in a specific implementation manner: the first device carries the second timestamp information in the sixth message. The message includes a second protocol field. Wherein, optionally, the second protocol field may be an existing protocol field in the sixth packet in the current protocol stack framework; the second protocol field may also be described in the current protocol stack framework Newly added protocol field in the sixth message. Optionally, when a flag is also carried in the sixth packet, the flag may also be carried in the second protocol field.

In an optional implementation manner, the sixth message may be generated when the first device encapsulates the second time stamp information into a second protocol field of the fifth message.

Step 2415: The access device sends a tenth message to the second device based on the sixth message; the tenth message carries the second time stamp information.

The tenth message also carries t22.

In an optional implementation manner, the access device sends a tenth packet to the second device based on the sixth packet. The specific method may be: when the access device detects the first packet, When the second protocol field included in the six messages carries the second time stamp information, the second time stamp information is encapsulated into a fifth protocol field of the sixth message to generate the tenth message And sending the tenth message to the second device. At this time, the fifth protocol field of the tenth message carries the second time stamp information.

For example, the second protocol field is the same as the second protocol field in step 2414, and similarly, reference may be made to the related description in step 701. The fifth protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending the tenth packet to the second device based on the sixth packet is the same as that of the access device in step 702 in the embodiment shown in FIG. 7 based on the first packet. The principle that the second device sends the third packet is the same. For related principles, see step 702. The fifth protocol field may be the same as the second protocol field in step 702, and may be referred to each other, and details are not described herein again.

In an optional implementation manner, after the second device receives the tenth message from the access device, the second device extracts the second time stamp information carried in a fifth protocol field included in the tenth message. . For example, for a specific method, reference may be made to situations n1, n2, and n3 in step 702, and details are not described herein again.

Step 2416: The second device sends a thirteenth message to the fourth device, and determines seventh timestamp information; the seventh timestamp information is sent by the second device to the fourth device. The time in the mobile network at the time of the thirteenth message is described.

The thirteenth message is generated after the second device deletes the second time stamp information in a fifth protocol field in the tenth message. At this time, the thirteenth message carries t22.

For example, the time corresponding to the seventh timestamp information may be recorded as t25 in FIG. 25.

In specific implementation, the fourth device records the time in the Ethernet network when the thirteenth message is received, for example, t26 in FIG. 25.

Step 2417: The first device receives a seventh message from the third device, and the seventh message carries fourth timestamp information, and the fourth timestamp information is sent from the third device to the third device. The time in the Ethernet network when the first device sends the fifth message.

For example, the time corresponding to the fourth timestamp information is t23 in FIG. 25.

Step 2418: The first device sends an eighth message to the access device, and the eighth message carries the third time stamp information and the fourth time stamp information.

Optionally, a flag (flag) may be carried in the eighth message, and the flag is used to indicate that the eighth message carries time stamp information indicating a time in a mobile network.

In an optional implementation manner, the third timestamp information carries the third timestamp information, and a specific method may be: the first device carries the third timestamp information in the eighth message The message includes the third protocol field. Wherein, optionally, the third protocol field may be an existing protocol field in the eighth message in the current protocol stack framework; the third protocol field may also be described in the current protocol stack framework Newly added protocol field in the eighth message. Optionally, when the eighth message also carries a flag, the flag may also be carried in the third protocol field.

In an optional implementation manner, the eighth message may be generated by the first device encapsulating the third time stamp information into a third protocol field of the seventh message.

Optionally, the third protocol field may be the same as the first protocol field in step 701 in the embodiment shown in FIG. 7. For a detailed description of the third protocol field, see the first protocol field in step 701. Relevant descriptions are not repeated here.

Step 2419: The access device sends an eleventh message to the second device based on the eighth message; the eleventh message carries the third time stamp information and the fourth time Poke information.

In an optional implementation manner, the access device sends an eleventh message to the second device based on the eighth message. The specific method may be: when the access device detects the When the third protocol field included in the eighth message carries the third time stamp information, the third time stamp information is encapsulated into the sixth protocol field of the eighth message to generate the eleventh message A message, and sending the eleventh message to the second device. At this time, the sixth protocol field of the eleventh message carries the second time stamp information.

For example, the third protocol field is the same as the third protocol field in step 2418, and similarly, reference may be made to the related description in step 701. The sixth protocol field may also be an existing protocol field, or may be a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending an eleventh message to the second device based on the eighth message is the same as that of the access device in step 702 in the embodiment shown in FIG. The principle for sending the third packet to the second device is the same. For related principles, see step 702. The sixth protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

In an optional implementation manner, after the second device receives the eleventh message from the access device, the second device extracts the third time carried in a sixth protocol field included in the eleventh message. Poke information. For example, for a specific method, reference may be made to situations n1, n2, and n3 in step 702, and details are not described herein again.

Step 2420: The second device according to the first time stamp information (t16), the second time stamp information (t21), the third time stamp information (t24), the fourth time stamp information, The fifth timestamp information (t17), the sixth timestamp information (t20), and the seventh timestamp information (t25) determine the eighth timestamp information.

For example, in the existing fixed network (Ethernet network), the time offset offset7 between the master and slaver (here, the third device and the fourth device) may meet the following formula 11:

Among them, t 'is the time in the Ethernet network when the third device sends the fifth message to the access device, and t is t23 in the existing fixed network.

For example, the time relationship in the Ethernet network can exist in the following formulas 14 to 14:

t18-t15 = offset8 + delay4 + Δt1 + Δt2 Equation 12;

t22-t19 = -offset8 + delay5 + Δt1 + Δt2 Formula 13;

t26-t23 = offset8 + delay6 + Δt1 + Δt2 Equation 14;

Wherein, offset8 is the time difference between the third device and the fourth device in the Ethernet network, delay4 is the transmission delay from the first device to the second device, and delay5 is the delay from the second device to The transmission delay of the first device; delay6 is the transmission delay of the first device to the second device; Δt1 is the transmission time between the third device and the first device (or the Transmission time between the second device and the fourth device); Δt2 is the transmission time between the second device and the fourth device (or between the third device and the first device) Transmission time).

The time relationship in the mobile network can exist in formula 15 to formula 17:

t17-t16 = offset9 + delay4 Formula 15;

t21-t20 = -offset9 + delay5 Formula 16;

t25-t24 = offset9 + delay6 Equation 17; formula 17;

Wherein, offset9 is a time deviation between the first device and the second device in the mobile network.

Because the clock inside the mobile network is synchronized, the value of the above offset9 is 0, so delay4 = t17-t16 can be obtained.

According to the above formula 13, formula 14, and formula 16, and formula 17, finishing can be

Substituting the results of delay4 and Δt1 + Δt2 into formula 12, we can get:

Another offset8 = offset7, we can get:

Then finishing can be obtained: t '= 2 (t16-t17) + t23 + t21-t20 + t25-t24, at this time, t' is the eighth time stamp information, that is, the eighth time stamp information corresponds The time is 2 (t16-t17) + t23 + t21-t20 + t25-t24.

Step 2421: The second device sends the eighth timestamp information to the fourth device, so that the fourth device performs time synchronization based on the eighth timestamp information.

In the prior art, the second device sends t23 to the fourth device. In this application, the second device sends the eighth timestamp information to the fourth device by using the existing method of sending t23. It can also be understood that instead of t23, the eighth timestamp information is sent to the fourth device. In this way, when the fourth device receives the eighth timestamp information, the fourth device Information is treated as t23 in the prior art.

In an optional implementation manner, after the fourth device receives the eighth timestamp new information, the fourth device is t16-t17) + t23 + t21-t20 + t25-t24) to obtain the time deviation between the third device and the fourth device, which can meet the following formula 18:

The above formula 18 can be regarded as obtained by the fourth device substituting the eighth timestamp information into the above formula eleven and replacing t ′, that is, the fourth device substitutes the eighth timestamp The information is obtained as the existing t23 processing.

Based on the above results, the fourth device may perform time synchronization according to offset10.

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 23. For example, in FIG. 26, the first device is a UPF and the second device is a UE, or the first device is a UE and the second device is a UPF; the third device is a master and the fourth device is slaver. Referring to FIG. 26, the specific process of the method includes:

Step 2601: The first device receives a first message from a third device, and determines first time stamp information, where the first time stamp information is in a mobile network when the first device receives the first message. time.

For example, FIG. 27 shows a schematic diagram of message transmission and reception during synchronization between the third device and the fourth device.

For example, the time corresponding to the first time stamp information may be t28 shown in FIG. 27.

In implementation, the first message carries the time in the Ethernet network when the third device sends the first message, for example, t27 shown in FIG. 27.

Step 2602: The first device sends the first message to the access device.

Step 2603: The access device sends the first message to a second device.

Step 2604: The second device sends the first message to a fourth device, and determines second time stamp information, where the second time stamp information moves when the second device sends the first message. Moments in the network.

For example, the time corresponding to the second time stamp information may be t29 in FIG. 27.

After receiving the first message, the fourth device records a time in the Ethernet network when the first message is received, for example, t30 in FIG. 27.

Step 2605: The second device receives a fifth message from the fourth device, and determines third time stamp information. The third time stamp information is when the second device receives the fifth message. The moment in the mobile network.

For example, the time corresponding to the third time stamp information may be recorded as t32 in FIG. 27.

The fourth device may record a time in the Ethernet network when the fifth message is sent, for example, t31 shown in FIG. 27.

Step 2606: The second device sends a fourth message to the access device, where the fourth message carries the second time stamp information and the third time stamp information.

In an optional implementation manner, the fourth message carries the second timestamp information and the third timestamp information, and a specific method may be: the second device sends the second time The stamp information and the third time stamp information are carried in a second protocol field included in the fourth message. For example, the second protocol field may be an existing protocol field in the fourth message in the current protocol stack framework; the second protocol field may also be described in the current protocol stack framework. Newly added protocol field in the fourth message. Optionally, when the fourth packet further carries a flag, the flag may also be carried in the second protocol field.

In an optional implementation manner, the fourth message may be a second message in which the second device encapsulates the second time stamp information and the third time stamp information into the fifth message. Generated in the agreement field.

Optionally, the second protocol field may be the same as the second protocol field in step 304 in the embodiment shown in FIG. 3. For a detailed description of the second protocol field, refer to the second protocol field in step 304. Relevant descriptions are not repeated here.

Step 2607: The access device sends a second message to the first device, where the second message carries the second time stamp information and the third time stamp information.

In an optional implementation manner, the access device sends the second message to the first device, a specific method may be: when the access device detects that the fourth message includes When the second protocol field carries the second time stamp information and the third time stamp information, the second time stamp information and the third time stamp information are encapsulated into a first protocol field included in the fourth message. To generate the second message, and send the second message to the first device.

For example, the second protocol field is the same as the second protocol field in step 2606, and reference may also be made to the related description in step 304. The first protocol field may also be an existing protocol field or a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending the second message to the first device is the same as the principle of the access device sending the second message to the first device in step 306 in the embodiment shown in FIG. 3, See related principles in step 306. The first protocol field may be the same as the first protocol field in step 306 and may be referred to each other, and details are not repeatedly described herein.

In an optional implementation manner, after receiving the second message from the access device, the first device extracts the second time stamp information carried in a first protocol field included in the second message. And the third timestamp information. For example, for specific methods, reference may be made to the situations g1, g2, and g3 in step 306, and details are not repeatedly described herein.

Step 2608: The first device sends a third message to the third device.

In an implementation manner, when the first device performs step 2608, the specific method may be: the first device sends the second timestamp in the first protocol field in the second packet. Information and the third time stamp information are deleted, the third message is generated and the third message is sent.

The third device may record a time in the Ethernet network when the third message is received, for example, t34 in FIG. 27.

Step 2609: The first device determines fourth time stamp information, where the fourth time stamp information is a time in the mobile network when the first device sends the third message.

For example, the time corresponding to the fourth time stamp information may be recorded as t33 in FIG. 27.

Step 2610: The first device receives a sixth message from the third device. The sixth message carries fifth time stamp information, and the fifth time stamp information is received by the third device. The time in the Ethernet network when the third message sent by the first device is described.

The time corresponding to the fifth time stamp information is t34 in FIG. 27.

Step 2611, the first device determines a first time stamp information according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, and the fifth time stamp information. Six timestamp information.

In an optional implementation manner, the specific method for the first device to perform step 2611 may be: the first device according to the first time stamp information (t28), the second time stamp information (t29) ), The third time stamp information (t32) and the fourth time stamp information (t33) determine a round-trip transmission delay difference between the first device and the second device; and then the first The device calculates the sum of the time (t34) corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.

For example, the clock synchronization between the first device and the second device that has been implemented within the mobile network may be used to calculate the round-trip transmission delay difference between the first device and the second device. For example, it can be calculated by the following formula 19 and formula 20:

t29-t28 = delay7 + offset10 Formula nineteen; formula 19;

t33-t32 = delay8-offset10 Formula 20;

In the above formula, offset10 is the time difference between the first device and the second device in the mobile network; delay7 is the transmission delay from the first device to the second device; delay8 is the second A transmission delay of the device to the first device.

Due to the internal clock synchronization of the mobile, the value of the above-mentioned offset10 is 0, so the round-trip transmission delay difference value delay7-delay8 = t29-t28-t33 + t32 can be obtained through the above formula 19 and formula 20.

Further, the time corresponding to the sixth timestamp information is t34 + t29-t28-t33 + t32.

Step 2612, the first device sends the sixth time stamp information to the access device.

For example, in the prior art, the first device sends the fifth timestamp information to the access device, so that the access device sends the second time stamp information to the second device, and then transmits the information to the first device. Four devices. In this application, the first device transmits the sixth time stamp information to the fourth device by using an existing method of sending the fifth time stamp information. It can also be understood that the sixth timestamp information is sent to the fourth device instead of the fifth timestamp information. In this way, when the fourth device receives the sixth timestamp information, it will send The sixth timestamp information is treated as the fifth timestamp information in the prior art.

In an optional implementation manner, when the first device executes step 2612, the first device may replace the fifth time stamp information in the sixth packet with the sixth time Stamp the information, generate a seventh message, and send the seventh message to the access device, the seventh message carries the sixth time stamp information, and finally the seventh message is sent To the fourth device.

Step 2613: The access device sends the sixth time stamp information to the second device.

Step 2614: The second device sends the sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information.

In an embodiment, the fourth device may determine the third device and the fourth device according to t27, t30, t31, and the sixth time stamp information (t34 + t29-t28-t33 + t32). Time deviation between the two, and time synchronization is performed according to the time deviation.

In an optional implementation manner, as described in step 2612, the fourth device may determine, according to the sixth timestamp information, when the third device considers that the third device receives the third packet. The time in the Ethernet network uses the sixth time stamp information as the fifth time stamp information.

Optionally, the time offset offset11 between the third device and the fourth device may meet the following formula twenty-one:

The embodiment of the present application also provides another synchronization method, which is applicable to the communication system shown in FIG. 1 and FIG. 23. For example, the first device in FIG. 28 is a UPF and the second device is a UE, or the first device is a UE and the second device is a UPF; the third device is a master and the fourth device is slaver. Referring to FIG. 28, the specific process of the method includes:

Step 2801: The first device receives the first message from the third device, and determines the first time stamp information, where the first time stamp information is in the mobile network when the first device receives the first message. time.

The triggering condition for the clock synchronization process initiated by the third device is the same as the principle described in step 301 in the embodiment shown in FIG. 3, which can be referred to each other and will not be repeated here.

For example, FIG. 29 shows a schematic diagram of message transmission and reception during synchronization between the third device and the fourth device.

For example, the first time stamp information may be recorded as t36 in FIG. 29.

In a specific implementation, the first message carries a time in the Ethernet network when the third device sends the first message, for example, t35 shown in FIG. 29.

Step 2802: The first device sends a second message to the access device based on the first message, and the second message carries the first time stamp information.

In an optional implementation manner, the second message carries the first timestamp information, and a specific method may be: the first device carries the first timestamp information in the second The message includes the first protocol field. Wherein, optionally, the first protocol field may be an existing protocol field in the second message in the current protocol stack framework; the first protocol field may also be described in the current protocol stack framework Newly added protocol field in the second message. Optionally, when the second packet also carries a flag, the flag may also be carried in the first protocol field.

In an optional implementation manner, the second message may be generated when the first device encapsulates the first time stamp information into a third protocol field of the first message.

In an implementation manner, the second message further carries t35.

Step 2803: The access device sends a fifth message to the second device based on the second message, and the fifth message carries the first time stamp information.

In an optional implementation manner, the access device sends the fifth message to the second device based on the second message, and a specific method may be: when the access device detects all the When the first protocol field included in the second message includes the first time stamp information, the access device encapsulates the first time stamp information into a second protocol field included in the second message. To generate the fifth message, and send the fifth message to the second device. At this time, the second protocol field of the fifth message carries the first time stamp information.

For example, the first protocol field is the same as the first protocol field in step 2802, and similarly, reference may be made to the related description in step 701. The second protocol field may also be an existing protocol field or a newly added field in an existing protocol stack framework. For example, the execution principle of the access device sending a fifth packet to the second device based on the second packet is the same as that in step 702 in the embodiment shown in FIG. 7 based on the first packet. The principle that the second device sends the third packet is the same. For related principles, see step 702. The second protocol field may be the same as the second protocol field in step 702 and may be referred to each other, and details are not repeatedly described herein.

In an optional implementation manner, after the second device receives the fifth message from the access device, the second device extracts the first time stamp information carried in a second protocol field included in the fifth message. . For example, for specific methods, reference may be made to the situations n1, n2, and n3 in step 702, which will not be repeated here.

The fifth message also carries t35.

Step 2804: The second device sends a sixth message to the fourth device, and determines fourth timestamp information, where the fourth timestamp information is the movement when the second device sends the sixth message. Moments in the network.

For example, the fourth time stamp information may be recorded as t37 in FIG. 29.

The sixth message may be generated after the second device deletes the first time stamp information in a second protocol field in the fifth message. At this time, the sixth message carries t35.

In specific implementation, the fourth device records the time in the Ethernet network when the sixth packet is received, for example, t38 in FIG. 29.

Step 2805: The second device receives a third message from the fourth device, and determines fifth timestamp information; the fifth timestamp information is when the second device receives the third message. The moment in the mobile network.

For example, the fifth time stamp information may be recorded as t40 in FIG. 29.

In specific implementation, the fourth device records the time in the Ethernet network when the third message is sent, for example, t39 in FIG. 29.

Step 2806: The second device sends the third message to the access device.

Step 2807: The access device sends the third message to the first device.

Step 2808: The first device sends the third message to the third device, and determines second time stamp information, where the second time stamp information is the first device sending the third message. The moment in the mobile network.

For example, the time corresponding to the second time stamp information may be recorded as t41 in FIG. 29.

In a specific implementation, the third device records the time in the Ethernet network when the third message is received, such as t42 shown in FIG. 29.

Step 2809: The first device receives a fourth message from the third device. The fourth message carries third time stamp information, and the third time stamp information is received by the third device. The third message sent by the first device is a time in an Ethernet network.

The time corresponding to the fourth timestamp information is t42.

Step 2810: The first device sends the second time stamp information and the third time stamp information to the access device.

Step 2811: The access device sends the second time stamp information and the third time stamp information to the second device.

Step 2812, the second device determines a first time stamp information according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, and the fifth time stamp information. Six timestamp information.

In an optional implementation manner, the specific method for the second device to perform step 2812 may be: the second device according to the first time stamp information (t36), the second time stamp information (t41 ), The fourth timestamp information (t37) and the fifth timestamp information (t40) determine a round-trip transmission delay difference between the first device and the second device; the second device Calculate the sum of the time corresponding to the third time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.

For example, the clock synchronization between the first device and the second device that has been implemented within the mobile network may be used to calculate the round-trip transmission delay difference between the first device and the second device. For example, it can be calculated by the following formula 22 and formula 23:

t37-t36 = delay9 + offset12 formula twenty-two;

t41-t40 = delay10-offset12 formula twenty-three;

In the above formula, offset12 is the time difference between the first device and the second device in the mobile network; delay9 is the transmission delay from the first device to the second device; delay10 is the second A transmission delay of the device to the first device.

Due to the internal clock synchronization of the mobile, the value of the above-mentioned offset12 is 0, so the round-trip transmission delay difference value delay9-delay10 = t37-t36-t41 + t40 can be obtained through the above formulas 22 and 23.

Further, the time corresponding to the sixth timestamp information is t42 + t37-t36-t41 + t40.

Step 2813: The second device sends the sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information.

For example, in the prior art, the second device sends the fourth time stamp information to the fourth device. In this application, the second device sends the sixth time stamp information to the fourth device by using the existing method for sending the fourth time stamp information. It can also be understood that the sixth timestamp information is sent to the fourth device instead of the fourth timestamp information. In this way, when the fourth device receives the sixth timestamp information, it will send The sixth timestamp information is treated as the fourth timestamp information in the prior art.

In an embodiment, the fourth device may determine the third device and the fourth device according to t35, t38, t39, and the sixth time stamp information (t42 + t37-t36-t41 + t40). Time deviation between the two, and time synchronization is performed according to the time deviation.

In an optional implementation manner, the fourth device may determine, according to the sixth timestamp information, the time in the Ethernet network when the third device considers that the third device receives the third packet, and The sixth time stamp information is used as the fourth time stamp information.

Optionally, the time offset offset13 between the third device and the fourth device may meet the following formula twenty-four:

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 21 above. method. For the structure of the first device, reference may also be made to FIG. 11. The first device may include a receiving unit 1103, a processing unit 1102, and a sending unit 1101. among them:

The receiving unit 1103 is configured to receive a first message from a third device; the processing unit 1102 is configured to determine first time stamp information, where the first time stamp information is moved when the first device receives the first message The time in the network; the sending unit 1101 is configured to send the first message to the second device through the access device; the receiving unit 1103 is further configured to receive the second message from the third device; the sending unit 1101 is further configured to send a third packet to the access device based on the second packet, and the third packet carries the first time stamp information; the receiving unit 1103 is further configured to receive the first packet from the access device. The device receives a fourth message; the sending unit 1101 is further configured to send the fourth message to the third device; the processing unit 1102 is further configured to determine second time stamp information, and the second time stamp The information is the time in the mobile network when the first device sends the fourth message to the third device; the receiving unit 1103 is further configured to receive a fifth message from the third device; the processing The unit 1102 is further configured to determine third time stamp information. The time stamp information is the time in the mobile network when the first device receives the fifth message; the sending unit 1101 is further configured to send a sixth message to the access device based on the fifth message. The sixth message carries the second timestamp information; the receiving unit 1103 is further configured to receive a seventh message from the third device; the seventh message carries fourth timestamp information The fourth timestamp information is the time in the Ethernet network when the third device sends the fifth message to the first device; the sending unit 1101 is further configured to send the first time to the access device. Eight messages; the eighth message carries the third timestamp information and the fourth timestamp information; wherein the first device is a user plane network element and the second device is a terminal device, Alternatively, the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1103, the processing unit 1102, and the sending unit 1101 in the first device, other operations or functions of the first device in the method in the embodiment shown in FIG. 21 may be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiment, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 21 above. method. For the structure of the access device, reference may also be made to FIG. 12. The access device may include a receiving unit 1201 and a sending unit 1202. among them:

The receiving unit 1201 is configured to receive a first message from the first device; the sending unit 1202 is configured to forward the first message to a second device; the receiving unit 1201 is further configured to receive a first message from the first device Three messages; the third message carries first time stamp information, and the first time stamp information is a time in the mobile network when the first device receives the first message from the third device; The sending unit 1202 is further configured to send a ninth message to the second device based on the third message; the ninth message carries first time stamp information; and the receiving unit 1201 is further configured to receive The second device receives a fourth message; the sending unit 1202 is further configured to send the fourth message to the first device; the receiving unit 1201 is further configured to receive a first message from the first device Six messages; the sixth message is sent by the first device to the access device based on the fifth message after receiving the fifth message from the third device; the sixth message The text carries second time stamp information, and the second time stamp information is that the first device The time in the mobile network when the incoming device receives the fourth message and sends the fourth message to the third device; the sending unit 1202 is further configured to send the fourth message to the first device based on the sixth message; The two devices send a tenth message; the tenth message carries the second time stamp information; the receiving unit 1201 is further configured to receive an eighth message from the first device; the eighth message Carrying third time stamp information and fourth time stamp information, the third time stamp information is a time in the mobile network when the first device receives the fifth message from the third device, the The fourth time stamp information is the time in the Ethernet network when the third device sends the fifth message to the first device; the sending unit 1202 is further configured to send the fifth message to the first device based on the eighth message. The two devices send an eleventh message; the eleventh message carries the third time stamp information and the fourth time stamp information; wherein the first device is a user plane network element and the first The two devices are terminal devices, or the first device is a terminal device and the second device is User plane network elements.

Optionally, the access device may further include a processing unit for detecting time stamp information in a protocol field in the message. For specific operations, refer to specific operations of the access device in the embodiment shown in FIG. 21 above. , Will not repeat them here.

In addition, based on the receiving unit 1201 and the sending unit 1202 in the access device, or a processing unit, other operations or functions of the access device in the method in the embodiment shown in FIG. 21 may be implemented. For details, refer to the foregoing. The embodiment is not repeated here.

Based on the above embodiment, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 2 to implement synchronization provided by the embodiment shown in FIG. 21 above. method. For the structure of the second device, reference may also be made to FIG. 13. The second device may include a receiving unit 1301, a processing unit 1302, and a sending unit 1303. among them:

The receiving unit 1301 is configured to receive a first message from an access device; the sending unit 1303 is configured to send the first message to a fourth device; the processing unit 1302 is configured to determine fifth time stamp information, and the fifth time stamp The information is the time in the mobile network when the second device sends the first message to the fourth device; the receiving unit 1301 is further configured to receive a ninth message from the access device; the first The nine messages carry first time stamp information, where the first time stamp information is a time in the mobile network when the first device receives the first message from a third device; the sending unit 1303 also uses Sending a twelfth message to the fourth device based on the ninth message; the receiving unit 1301 is further configured to receive a fourth message from the fourth device; the processing unit 1302 is further configured to determine Sixth time stamp information, where the sixth time stamp information is a time in the mobile network when the second device receives the fourth message; and the sending unit 1303 is further configured to send all information to the access device. The fourth message; the receiving unit 1301 is further configured to send The incoming device receives the tenth message; the tenth message carries second timestamp information, and the second timestamp information is obtained after the access device sends the fourth message to the first device. The time in the mobile network when the first device sends the fourth message to the third device; the sending unit 1303 is further configured to send the thirteenth message to the fourth device; the processing unit 1302, For determining seventh time stamp information; the seventh time stamp information is a time in the mobile network when the second device sends the thirteenth message to the fourth device; the receiving unit 1301 also uses Receiving an eleventh message from the access device, the eleventh message carries third time stamp information and fourth time stamp information, and the third time stamp information is obtained from the first device The time in the mobile network when the third device receives the fifth message, and the fourth time stamp information is the time in the Ethernet network when the third device sends the fifth message to the first device. Time; the processing unit 1302 is further configured to use the first time stamp information The second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, the sixth time stamp information, and the seventh time stamp information determine a first time stamp information. Eight timestamp information; the sending unit 1303 is further configured to send the eighth timestamp information to the fourth device, so that the fourth device performs time synchronization based on the eighth timestamp information; wherein, The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1301, the processing unit 1302, and the sending unit 1303 in the second device, other operations or functions of the second device in the method in the embodiment shown in FIG. 21 may be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiment, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 24 above. method. For the structure of the first device, reference may also be made to FIG. 11. The first device may include a sending unit 1101, a processing unit 1102, and a receiving unit 1103. among them:

The sending unit 1101 is configured to send a first message to an access device; the processing unit 1102 is configured to determine first time stamp information and second time stamp information; and the first time stamp information is sent by the first device to the first device. The first message is the time in the Ethernet network, and the second time stamp information is the time in the mobile network when the first device sends the first message; the sending unit 1101 is further configured to send the message to the receiver. The incoming device sends a second message, where the second message carries the first timestamp information and the second timestamp information; the receiving unit 1103 is configured to receive a third message from the access device; The processing unit 1102 is further configured to determine third time stamp information, where the third time stamp information is a time in the Ethernet network when the first device receives the third packet; the sending unit 1101 is further configured to: Sending a fourth message to the access device, where the fourth message carries the third timestamp information; the processing unit 1102 is further configured to determine fourth timestamp information; the fourth timestamp information When sending the fourth message for the first device The time in the Ethernet network; the sending unit 1101 is further configured to send a fifth message to the access device, where the fifth message carries the fourth time stamp information; wherein the first device is A user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1103, the processing unit 1102, and the sending unit 1101 in the first device, other operations or functions of the first device in the method in the embodiment shown in FIG. 24 may be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 24 above. method. For the structure of the access device, reference may also be made to FIG. 12. The access device may include a receiving unit 1201 and a sending unit 1202. among them:

The receiving unit 1201 is configured to receive the first message from the first device; the sending unit 1202 is configured to forward the first message to the second device; the receiving unit 1201 is further configured to receive the first message from the first device After two messages; the second message carries first time stamp information and second time stamp information, and the first time stamp information is that the first device sends the first message to the access device The time in the Ethernet network at the time, and the second time stamp information is the time in the mobile network when the first device sends the first message to the access device; the sending unit 1202 is further configured to The second message sends a sixth message to the second device; the sixth message carries the first time stamp information and the second time stamp information; and the receiving unit 1201 is further configured to: Receiving a third message from the second device; the sending unit 1202 is further configured to forward the third message to the first device; the receiving unit 1201 is further configured to receive a third message from the first device Four messages, the fourth message carries third time stamp information, and the third time The time stamp information is the time in the Ethernet network when the first device receives the third message sent by the access device; the sending unit 1202 is further configured to forward the fourth message to the second device The receiving unit 1201 is further configured to receive a fifth message from the first device, where the fifth message carries fourth timestamp information, and the fourth timestamp information is sent by the first device to The time in the Ethernet network when the access device sends the fourth message; the sending unit 1202 is further configured to forward the fifth message to the second device; wherein the first device is a user plane network And the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

Optionally, the access device may further include a processing unit for detecting time stamp information in a protocol field in the message. For specific operations, refer to specific operations of the access device in the embodiment shown in FIG. 24 above. , Will not repeat them here.

In addition, based on the receiving unit 1201 and the sending unit 1202 in the access device, or a processing unit, other operations or functions of the access device in the method of the embodiment shown in FIG. 24 may be implemented. For details, refer to the foregoing. The embodiment is not repeated here.

Based on the above embodiments, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 24 above. method. For the structure of the second device, reference may also be made to FIG. 13. The second device may include a receiving unit 1301, a processing unit 1302, and a sending unit 1303. among them:

The receiving unit 1301 is configured to receive a first message from an access device; the processing unit 1302 is configured to determine fifth time stamp information and sixth time stamp information, where the fifth time stamp information is received by the second device. The first message is the time in the Ethernet network, and the sixth time stamp information is the time in the mobile network when the second device receives the first message; the receiving unit 1301 is further configured to receive The access device receives a sixth message, where the sixth message carries the first timestamp information and the second timestamp information; the first timestamp information is the first device to the access device The time in the Ethernet network when the first message is sent, and the second time stamp information is the time in the mobile network when the first device sends the first message to the access device; the sending unit 1303 Configured to send a third message to the access device; the processing unit 1302 is further configured to determine seventh timestamp information, where the seventh timestamp information is when the second device sends the third message The time in the Ethernet network; the receiving unit 1301 also uses Receiving a fourth message from the access device; the fourth message carries third timestamp information, and the third timestamp information is that the access device receives the third message from the second device After the message, after forwarding the third message to the first device, the time in the Ethernet network when the first device received the third message; the processing unit 1302 is further configured to determine an eighth time Timestamp information, the eighth timestamp information is the time in the Ethernet network when the second device receives the fourth packet; the receiving unit 1301 is further configured to receive a fifth packet from the access device Message, the fifth message carries fourth timestamp information, and the fourth timestamp information is the time in the Ethernet network when the first device sends the fourth message to the access device; The processing unit 1302 is further configured to: according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, the Sixth time stamp information, the seventh time stamp information, and the eighth time The information determines a time deviation between the first device and the second device, and performs time synchronization according to the time deviation; wherein the first device is a user plane network element and the second device is a terminal device. Or, the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1301, processing unit 1302, and sending unit 1303 in the second device, other operations or functions of the second device in the method in the embodiment shown in FIG. 24 may also be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 26 above. method. For the structure of the first device, reference may also be made to FIG. 11. The first device may include a sending unit 1101, a processing unit 1102, and a receiving unit 1103. among them:

The receiving unit 1103 is configured to receive a first message from a third device; the sending unit 1101 is configured to send the first message to a second device through an access device; and the processing unit 1102 is configured to determine first time stamp information. The first time stamp information is a time in the mobile network when the first device receives the first message; the receiving unit 1103 is further configured to receive a second message from the access device; the second The message carries the second time stamp information and the third time stamp information, and the second time stamp information is that the second device sends the first message to the fourth device after receiving the first message The time in the mobile network; the third time stamp information is the time in the mobile network when the second device receives the fifth message from the fourth device; the sending unit 1101 is further configured to send The third device sends a third message; the processing unit 1102 is further configured to determine fourth timestamp information, where the fourth timestamp information is the movement when the first device sends the third message Time in the network; the receiving unit 1103 is further configured to The third device receives a sixth message, and the sixth message carries fifth timestamp information, where the fifth timestamp information is the third device received the third message sent by the first device The time when the message is in the Ethernet network; the processing unit 1102 is further configured to determine according to the first time stamp information, second time stamp information, third time stamp information, fourth time stamp information, and fifth time stamp information Sixth time stamp information; the sending unit 1101 is further configured to forward the sixth time stamp information to the second device through the access device; wherein the first device is a user plane network element and is The second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1103, the processing unit 1102, and the sending unit 1101 in the first device, other operations or functions of the first device in the method in the embodiment shown in FIG. 26 may also be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 26 above. method. For the structure of the access device, reference may also be made to FIG. 12. The access device may include a receiving unit 1201 and a sending unit 1202. among them:

The receiving unit 1201 is configured to receive a first message from the first device; the sending unit 1202 is configured to send the first message to a second device; and the receiving unit 1201 is further configured to receive from the second device A fourth message, where the fourth message carries second timestamp information and third timestamp information; the second timestamp information is sent to the first device after the second device receives the first message; The moment in the mobile network when the four devices send the first message; the fourth message is based on the fifth message after the second device receives the fifth message from the fourth device The third time stamp information is the time in the mobile network when the second device receives the fifth message; the sending unit 1202 is further configured to send The first device sends a second message, and the second message carries the second timestamp information and the third timestamp information; the receiving unit 1201 is further configured to receive a first message from the first device. Six timestamp information; the sending unit 1202 is further configured to send the first time stamp to the second device. Timestamp information; wherein, the first device is a user plane network element and the second device is a terminal device or said first device is a terminal device and the second device is a user plane network element.

Optionally, the access device may further include a processing unit for detecting timestamp information in a protocol field in the message. For specific operations, refer to the specific operations of the access device in the embodiment shown in FIG. 26 above. , Will not repeat them here.

In addition, based on the receiving unit 1201 and the sending unit 1202 in the access device, or a processing unit, other operations or functions of the access device in the method in the embodiment shown in FIG. 26 may be implemented. For details, refer to the foregoing. The embodiment is not repeated here.

Based on the above embodiment, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 26 above. method. For the structure of the second device, reference may also be made to FIG. 13. The second device may include a receiving unit 1301, a processing unit 1302, and a sending unit 1303. among them:

The receiving unit 1301 is configured to receive a first message from an access device; the sending unit 1303 is configured to send the first message to a fourth device; and the processing unit 1302 is configured to determine second time stamp information and the second time The stamp information is the time in the mobile network when the second device sends the first message; the receiving unit 1301 is further configured to receive a fifth message from the fourth device; and the processing unit 1302 is further configured to Determining third time stamp information, where the third time stamp information is a time in the mobile network when the second device receives the fifth message; and the sending unit 1303 is further configured to send an access message to the access device. The device sends a fourth message, where the fourth message carries the second timestamp information and the third timestamp information; the receiving unit 1301 is further configured to receive a sixth timestamp from the access device Information; the sending unit 1303 is further configured to send the sixth timestamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth timestamp information; wherein the first The device is a user plane network element and the second device The terminal device, or, the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1301, the processing unit 1302, and the sending unit 1303 in the second device, other operations or functions of the second device in the method in the embodiment shown in FIG. 26 may also be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, this application further provides a first device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 28 above. method. For the structure of the first device, reference may also be made to FIG. 11. The first device may include a sending unit 1101, a processing unit 1102, and a receiving unit 1103. among them:

The receiving unit 1103 is configured to receive a first message from a third device; the processing unit 1102 is configured to determine first time stamp information, where the first time stamp information is moved when the first device receives the first message Time in the network; the sending unit 1101 is configured to send a second message to the access device based on the first message, and the second message carries the first time stamp information; the receiving unit 1103 also uses Receiving a third message from the access device; the sending unit 1101 is further configured to send the third message to the third device; the processing unit 1102 is configured to determine second time stamp information, so The second time stamp information is a time in the mobile network when the first device sends the third message; the receiving unit 1103 is further configured to receive a fourth message from the third device, and the The fourth message carries third time stamp information, and the third time stamp information is a time in the Ethernet network when the third device receives the third message sent by the first device; the The sending unit 1101 is further configured to combine the second timestamp information with all Third time stamp information is sent to the access device; wherein the first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device The device is a user plane network element.

In addition, based on the receiving unit 1103, the processing unit 1102, and the sending unit 1101 in the first device, other operations or functions of the first device in the method in the embodiment shown in FIG. 28 may be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, this application further provides an access device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 28 above. method. For the structure of the access device, reference may also be made to FIG. 12. The access device may include a receiving unit 1201 and a sending unit 1202. among them:

The receiving unit 1201 is configured to receive a second message from the first device, where the second message carries first time stamp information, and the second message is the first message received by the first device from the third device. Sent to the access device after a message, the first time stamp information is the time in the mobile network when the first device receives the first message; the sending unit 1202 is configured to The second message sends a fifth message to the second device, and the fifth message carries the first time stamp information;

The receiving unit 1201 is further configured to receive a third message from the second device; the sending unit 1202 is further configured to send the third message to the first device; the receiving unit 1201 is further configured to: Receiving second time stamp information and third time stamp information from the first device, where the second time stamp information is that the first device sends the first time stamp to the third device after receiving the third message; The time in the mobile network during three messages; the third time stamp information is the time in the Ethernet network when the third device receives the third message sent by the first device; the sending The unit 1202 is further configured to send the second time stamp information and the third time stamp information to the second device; wherein the first device is a user plane network element and the second device is a terminal device, Alternatively, the first device is a terminal device and the second device is a user plane network element.

Optionally, the access device may further include a processing unit for detecting time stamp information in a protocol field in the packet. For specific operations, refer to specific operations of the access device in the embodiment shown in FIG. 28 above. , Will not repeat them here.

In addition, based on the receiving unit 1201 and the sending unit 1202 in the access device, or a processing unit, other operations or functions of the access device in the method in the embodiment shown in FIG. 28 may also be implemented. For details, refer to the foregoing. The embodiment is not repeated here.

Based on the above embodiment, this application further provides a second device, which can be applied to the communication system shown in FIG. 1 or FIG. 23 to implement synchronization provided by the embodiment shown in FIG. 28 above. method. For the structure of the second device, reference may also be made to FIG. 13. The second device may include a receiving unit 1301, a processing unit 1302, and a sending unit 1303. among them:

The receiving unit 1301 is configured to receive a fifth message from the access device, where the fifth message carries first timestamp information; the first timestamp information is the first message received by the first device from the third device Time in a mobile network; a sending unit 1303 is configured to send a sixth message to a fourth device; a processing unit 1302 is configured to determine fourth time stamp information, where the fourth time stamp information is sent by the second device The sixth message is the time in the mobile network; the receiving unit 1301 is further configured to receive a third message from the fourth device; the processing unit 1302 is further configured to determine fifth time stamp information; the The fifth time stamp information is a time in the mobile network when the second device receives the third message; the sending unit 1303 is further configured to send the third message to the access device; The receiving unit 1301 is further configured to receive second timestamp information and third timestamp information from the access device; the second timestamp information is the third message received by the access device and sent to the access device. After the first device sends the third message, the The time in the mobile network when the first device sends the third message to the third device; the third time stamp information is the third message received by the third device and sent by the first device The time in the time Ethernet network; the processing unit 1302 is further configured to determine the first time stamp information according to the first time stamp information, the second time stamp information, the third time stamp information, the fourth time stamp information, and the fifth time stamp information; Six timestamp information; the sending unit 1303 is further configured to send the sixth timestamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth timestamp information; wherein, The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.

In addition, based on the receiving unit 1301, the processing unit 1302, and the sending unit 1303 in the second device, other operations or functions of the second device in the method in the embodiment shown in FIG. 28 may be implemented. For details, refer to the foregoing embodiments. , Will not repeat them here.

Based on the above embodiments, an embodiment of the present application further provides a first device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 21. Referring also to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 is configured to implement the synchronization method shown in FIG. 21. For details, refer to the related description in the embodiment shown in FIG. 21, and details are not described herein again.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 21.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 21. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 is configured to implement the synchronization method shown in FIG. 21. For details, refer to the related description in the embodiment shown in FIG. 21, and details are not described herein again.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 21.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2 to implement the synchronization method shown in FIG. 21. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 is configured to implement the synchronization method shown in FIG. 21. For details, refer to the related description in the embodiment shown in FIG. 7, and details are not described herein again.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 21.

Based on the above embodiments, an embodiment of the present application further provides a first device. The first device is applied to a communication system as shown in FIG. 1 or FIG. 23, and may be used to implement FIG. 24, FIG. 26, or FIG. 28. Synchronization method shown. Referring also to FIG. 18, the first device includes a transceiver 1801, a processor 1802, and a memory 1803, where:

The processor 1802 is configured to implement the synchronization method shown in FIG. 24, FIG. 26, or FIG. 28. For details, refer to related descriptions in the embodiments shown in FIG. 24, FIG. 26, or FIG. 28, respectively. More details.

The memory 1803 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1803 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one disk memory. The processor 1802 executes an application program stored in the memory 1803 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 24, FIG. 26, or FIG. 28.

Based on the above embodiments, an embodiment of the present application further provides an access device, which is applied to a communication system as shown in FIG. 1 or FIG. 2 and is used to implement the communication device shown in FIG. The synchronization method shown below. Referring to FIG. 19, the access device includes a transceiver 1901, a processor 1902, and a memory 1903, where:

The processor 1902 is configured to implement the synchronization method shown in FIG. 24, FIG. 26, or FIG. 28. For details, refer to the related description in the embodiments shown in FIG. 24, FIG. 26, or FIG. 28, respectively. More details.

The memory 1903 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 1903 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 1902 executes an application program stored in the memory 1903 to implement the foregoing functions, thereby implementing the synchronization method shown in FIG. 24, FIG. 26, or FIG. 28.

Based on the above embodiments, an embodiment of the present application further provides a second device, which is applied to the communication system shown in FIG. 1 or FIG. 2, and is used to implement the device shown in FIG. 24, FIG. 26, or FIG. 28. The synchronization method shown below. Referring to FIG. 20, the second device includes a transceiver 2001, a processor 2002, and a memory 2003, where:

The processor 2002 is configured to implement the synchronization method shown in FIG. 24, FIG. 26, or FIG. 28. For details, refer to related descriptions in the embodiments shown in FIG. 24, FIG. 26, or FIG. To repeat.

The memory 2003 is used to store programs and the like. Specifically, the program may include program code, where the program code includes a computer operation instruction. The memory 2003 may include a RAM, and may also include a non-volatile memory (non-volatile memory), for example, at least one magnetic disk memory. The processor 2002 executes an application program stored in the memory 2003 to implement the foregoing functions, thereby implementing a synchronization method as shown in FIG. 24, FIG. 26, or FIG. 28.

In summary, the embodiments of the present application provide a synchronization method and device. During the clock synchronization process, the influence of the transmission delay between the first device and the second device can be avoided, thereby realizing the mobile network and the Ethernet network. In the docking scenario, the clock accuracy requirements of industrial factories are met.

Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Therefore, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

This application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, so that instructions generated by the processor of the computer or other programmable data processing device may be used to Means for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions The device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. In this way, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and variations.

Claims

A synchronization method, comprising:

The first device sends a first message to the access device, the first message carries the first time stamp information, and determines the second time stamp information, where the first time stamp information is sent by the first device The time in the Ethernet network when the first message is described, and the second time stamp information is the time in the mobile network when the first device sends the first message;

The first device receives a second message from the access device, the second message carries third time stamp information and fourth time stamp information, and the third time stamp information is received by the second device The time in the mobile network when the access device sends a third message to the second device based on the first message, and the fourth time stamp information is the time when the second device sends the message to the access device. The moment in the mobile network when the incoming device sends a fourth message; the second message is sent by the access device to the first device based on the fourth message;

The first device determines fifth time stamp information and sixth time stamp information, the fifth time stamp information is a time in the Ethernet network when the first device receives the second message, the The sixth time stamp information is a time in the mobile network when the first device receives the second message;

Determining, by the first device, a seventh timestamp based on the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, and the sixth timestamp information information;

The first device forwards the seventh timestamp information to the second device through the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 1, wherein the first device is based on the second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth timestamp information Determining the seventh timestamp information with the sixth timestamp information includes:

Determining, by the first device, between the first device and the second device according to the second time stamp information, the third time stamp information, the fourth time stamp information, and the sixth time stamp information. Round-trip transmission delay difference between rounds;

The first device calculates a sum of a time corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the seventh time stamp information.
The method according to claim 1 or 2, wherein after the first device receives a second message from the access device, the method further comprises:

Extracting, by the first device, the third time stamp information and the fourth time stamp information carried in a first protocol field included in the second message.
The method of claim 3, wherein:

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

The second device receives a third message from the access device, and the third message carries first time stamp information, where the first time stamp information is a time in the Ethernet network when the first device sends the first message; The third message is sent by the access device based on the first message after receiving the first message from the first device; wherein the first device is a user plane network element and The second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element;

The second device determines third time stamp information and eighth time stamp information, the third time stamp information is a time in the mobile network when the second device receives the third message, the The eighth time stamp information is a time in the Ethernet network when the second device receives the third message;

Sending, by the second device, a fourth message to the access device, where the fourth message carries the third time stamp information and the fourth time stamp information, and the fourth time stamp information is the first time stamp information The time in the mobile network when the two devices send the fourth message to the access device;

The second device determines ninth time stamp information, where the ninth time stamp information is a time in the Ethernet network when the second device sends the fourth message to the access device;

Receiving, by the second device, seventh time stamp information from the access device;

Determining, by the second device, between the first device and the second device according to the first time stamp information, the eighth time stamp information, the ninth time stamp information, and the seventh time stamp information. Between the time deviations, and time synchronization is performed according to the time deviations.
The method according to claim 5, further comprising:

Determining, by the second device, a time in the Ethernet network when the first device receives a second message according to the seventh timestamp information, and the second message is based on the Four messages are sent to the first device.
The method according to claim 5 or 6, wherein the fourth message carries the third time stamp information and the fourth time stamp information, comprising:

The second device carries the third timestamp information and the fourth timestamp information in a second protocol field included in the fourth message.
The method of claim 7, wherein:

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A synchronization method, comprising:

The first device sends a first message to the access device, where the first message carries first time stamp information and second time stamp information, and the first time stamp information is the first device sending the first time stamp information. A time in the Ethernet network during a message, and the second time stamp information is a time in the mobile network when the first device sends the first message;

Receiving, by the first device, a second message from the access device, and determining third time stamp information and fourth time stamp information, where the third time stamp information is that the first device receives the second time stamp The time when the message is in the Ethernet network, and the fourth time stamp information is the time in the mobile network when the first device receives the second message;

Sending, by the first device, the third timestamp information and the fourth timestamp information to the access device, the first timestamp information, the second timestamp information, and the third time The stamp information and the fourth time stamp information are used for time synchronization;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 9, wherein the first message carrying the second timestamp information comprises:

The first device carries the second time stamp information in a first protocol field included in the first packet.
The method of claim 10, wherein:

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field;

When the first device is a terminal device, the first protocol field is in a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

The second device receives a third message from the access device, and the third message carries the first time stamp information and the second time stamp information, and the first time stamp information is when the first device sends the first message The time in the Ethernet network; the second time stamp information is the time in the mobile network when the first device sends the first message; the third message is the time when the access device sends the first message from the first device And is sent based on the first message after the device receives the first message, wherein the first device is a user plane network element and the second device is a terminal device, or the first device is A terminal device and the second device is a user plane network element;

The second device determines fifth time stamp information and sixth time stamp information, where the fifth time stamp information is a time in the Ethernet network when the second device receives the third message, and The sixth time stamp information is a time in the mobile network when the second device receives the third message;

Sending, by the second device, a fourth message to the access device, and determining seventh time stamp information and eighth time stamp information, where the seventh time stamp information is the second device sending to the access device The time in the Ethernet network when the fourth message is sent, and the eighth timestamp information is the time in the mobile network when the second device sends the fourth message to the access device ;

Receiving, by the second device, third timestamp information and fourth timestamp information from the access device, where the third timestamp information is in the Ethernet network when the first device receives the second message Time, the fourth timestamp information is the time in the mobile network when the first device received the second message; the second message is based on the Four packets are sent to the first device;

The second device according to the first timestamp information, the second timestamp information, the sixth timestamp information, the eighth timestamp information, the third timestamp information, the fourth The timestamp information, the fifth timestamp information, and the seventh timestamp information determine a time offset between the first device and the second device, and perform time synchronization according to the time offset.
The method according to claim 12, wherein the second device is based on the first timestamp information, the second timestamp information, the sixth timestamp information, and the eighth timestamp information , The third time stamp information, the fourth time stamp information, the fifth time stamp information, and the seventh time stamp information determine a time offset between the first device and the second device, include:

Determining, by the second device, between the first device and the second device according to the second time stamp information, the sixth time stamp information, the eighth time stamp information, and the fourth time stamp information. Round-trip transmission delay difference between rounds;

Determining, by the second device, the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, and the round-trip transmission delay difference value. A time offset between a device and the second device.
The method according to claim 13, wherein the second device is based on the first timestamp information, the third timestamp information, the fifth timestamp information, and the seventh timestamp information Determining the time difference between the first device and the second device with the round-trip transmission delay difference includes:

Determining, by the second device, ninth time stamp information, which is a sum of a time corresponding to the third time stamp information and the round-trip transmission delay difference value;

Determining, by the second device, between the first device and the second device according to the first timestamp information, the fifth timestamp information, the seventh timestamp information, and the ninth timestamp information Time deviation.
The method according to any one of claims 12 to 14, wherein after the second device receives the third packet from the access device, the method further comprises:

Extracting, by the second device, the second time stamp information carried in a second protocol field included in the third message.
The method according to claim 15, wherein:

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A first device, comprising:

A sending unit, configured to send a first message to the access device, where the first message carries first timestamp information, and the first timestamp information is when the first device sends the first message Moments in Ethernet networks;

A processing unit, configured to determine second time stamp information, where the second time stamp information is a time in a mobile network when the first device sends the first message;

A receiving unit, configured to receive a second message from the access device, where the second message carries third time stamp information and fourth time stamp information, and the third time stamp information is received by the second device The time in the mobile network when the access device sends a third message to the second device based on the first message, and the fourth time stamp information is the time when the second device sends the message to the access device. The moment in the mobile network when the incoming device sends a fourth message; the second message is sent by the access device to the first device based on the fourth message;

The processing unit is further configured to determine fifth time stamp information and sixth time stamp information, where the fifth time stamp information is a time in the Ethernet network when the first device receives the second message. The sixth time stamp information is a time in the mobile network when the first device receives the second message;

The processing unit is further configured to determine a first time stamp according to the second time stamp information, the third time stamp information, the fourth time stamp information, the fifth time stamp information, and the sixth time stamp information. Seven timestamp information;

The sending unit is further configured to forward the seventh timestamp information to the second device through the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 17, wherein the processing unit, in accordance with the second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth When the timestamp information and the sixth timestamp information determine the seventh timestamp information, it is specifically used to:

Determining a round-trip transmission time between the first device and the second device according to the second time stamp information, the third time stamp information, the fourth time stamp information, and the sixth time stamp information Delay difference

Calculate the sum of the time corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the seventh time stamp information.
The first device according to claim 17 or 18, wherein the processing unit is further configured to:

After the receiving unit receives a second message from the access device, the third time stamp information and the fourth time stamp information carried in a first protocol field included in the second message are extracted.
The first device according to claim 19, wherein:

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A second device, comprising:

A receiving unit, configured to receive a third message from the access device, where the third message carries first timestamp information, where the first timestamp information is in the Ethernet network when the first device sends the first message; Time; the third message is sent by the access device based on the first message after receiving the first message from the first device; wherein the first device is a user plane network And the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element;

A processing unit, configured to determine third time stamp information and eighth time stamp information, where the third time stamp information is a time in the mobile network when the second device receives the third message, and the The eighth time stamp information is a time in the Ethernet network when the second device receives the third message;

A sending unit, configured to send a fourth message to the access device, where the fourth message carries the third time stamp information and the fourth time stamp information, and the fourth time stamp information is the first time stamp information The time in the mobile network when the two devices send the fourth message to the access device;

The processing unit is further configured to determine ninth time stamp information, where the ninth time stamp information is a time in the Ethernet network when the second device sends the fourth message to the access device;

The receiving unit is further configured to receive seventh timestamp information from the access device;

The processing unit is further configured to determine the first device and the first device according to the first time stamp information, the eighth time stamp information, the ninth time stamp information, and the seventh time stamp information. Time deviation between the two devices, and time synchronization is performed according to the time deviation.
The second device according to claim 21, wherein the processing unit is further configured to:

Determine the time in the Ethernet network when the first device receives the second message according to the seventh timestamp information, and the second message is sent by the access device to the server based on the fourth message. Said by the first device.
The second device according to claim 21 or 22, wherein when the fourth packet carries the third time stamp information and the fourth time stamp information, the sending unit is specifically configured to: :

Carrying the third timestamp information and the fourth timestamp information in a second protocol field included in the fourth message.
The second device according to claim 23, wherein

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A first device, comprising:

A sending unit, configured to send a first message to the access device, where the first message carries first and second timestamp information, and the first timestamp information is sent by the first device The time in the Ethernet network when the first message is described, and the second time stamp information is the time in the mobile network when the first device sends the first message;

A receiving unit, configured to receive a second message from the access device, and determine third time stamp information and fourth time stamp information, where the third time stamp information is that the first device receives the second time stamp The time when the message is in the Ethernet network, and the fourth time stamp information is the time in the mobile network when the first device receives the second message;

The sending unit is further configured to send the third timestamp information and the fourth timestamp information to the access device, the first timestamp information, the second timestamp information, the The third timestamp information and the fourth timestamp information are used for time synchronization;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 25, wherein when the first message carries the second time stamp information, the sending unit is specifically configured to:

Carrying the second time stamp information in a first protocol field included in the first message.
The first device according to claim 26, wherein

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field;

When the first device is a terminal device, the first protocol field is in a service data protocol SDAP field or a data aggregation protocol PDCP field.
A second device, comprising:

A receiving unit, configured to receive a third message from the access device, where the third message carries first time stamp information and second time stamp information, and the first time stamp information is the first device sending the first message The time in the Ethernet network; the second time stamp information is the time in the mobile network when the first device sends the first message; the third message is the time when the access device sends Sent by the first device based on the first message after receiving the first message; wherein the first device is a user plane network element and the second device is a terminal device, or the first device The device is a terminal device and the second device is a user plane network element;

A processing unit, configured to determine fifth time stamp information and sixth time stamp information, where the fifth time stamp information is a time in the Ethernet network when the second device receives the third message, and the The sixth time stamp information is a time in the mobile network when the second device receives the third message;

A sending unit, configured to send a fourth message to the access device, and determine seventh timestamp information and eighth timestamp information, where the seventh timestamp information is from the second device to the access device The time in the Ethernet network when the fourth message is sent, and the eighth timestamp information is the time in the mobile network when the second device sends the fourth message to the access device ;

The receiving unit is further configured to receive third timestamp information and fourth timestamp information from the access device, where the third timestamp information is in the first device when the second device receives the second message. The time in the Ethernet network, the fourth time stamp information is the time in the mobile network when the first device received the second message; the second message is based on the access device The fourth message is sent to the first device;

The processing unit is further configured to: according to the first time stamp information, the second time stamp information, the sixth time stamp information, the eighth time stamp information, the third time stamp information, The fourth time stamp information, the fifth time stamp information, and the seventh time stamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation.
The second device according to claim 28, wherein the processing unit, in accordance with the first timestamp information, the second timestamp information, the sixth timestamp information, the eighth The timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, and the seventh timestamp information determine the time between the first device and the second device. When the time is offset, it is specifically used for:

Determining a round-trip transmission time between the first device and the second device according to the second time stamp information, the sixth time stamp information, the eighth time stamp information, and the fourth time stamp information Delay difference

Determining the first device and the first device according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, and the round-trip transmission delay difference value Time deviation between the second devices.
The second device according to claim 29, wherein the processing unit, in accordance with the first timestamp information, the third timestamp information, the fifth timestamp information, and the seventh When the time stamp information and the round-trip transmission delay difference value determine a time deviation between the first device and the second device, the method is specifically used to:

Determining ninth time stamp information, where the ninth time stamp information is a sum of a time corresponding to the third time stamp information and the round-trip transmission delay difference value;

Determining a time offset between the first device and the second device according to the first time stamp information, the fifth time stamp information, the seventh time stamp information, and the ninth time stamp information.
A synchronization method, comprising:

Receiving, by a first device, a first message from a third device, and determining first time stamp information, where the first time stamp information is a time in a mobile network when the first device receives the first message;

Sending, by the first device, the first message to a second device through an access device;

After receiving the second message from the third device, the first device sends a third message to the access device based on the second message, and the third message carries the first time Stamp information

After receiving the fourth message from the access device, the first device sends the fourth message to the third device, and determines second time stamp information, where the second time stamp information is the first The time in the mobile network when the device sends the fourth message to the third device;

Receiving, by the first device, a fifth message from the third device, and determining third time stamp information, where the third time stamp information is in a mobile network when the first device receives the fifth message The moment

Sending, by the first device, a sixth message to the access device based on the fifth message, where the sixth message carries the second time stamp information;

After receiving the seventh message from the third device, the first device sends an eighth message to the access device; the seventh message carries fourth time stamp information, and the fourth time stamp The information is the time in the Ethernet network when the third device sends the fifth message to the first device, and the eighth message carries the third time stamp information and the fourth time stamp information. ;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 31, wherein the carrying of the first timestamp information in the third packet comprises:

The first device carries the first time stamp information in a first protocol field included in the third message;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field.
The method according to claim 31 or 32, wherein the sixth message carries the second time stamp information, comprising:

The first device carries the second time stamp information in a second protocol field included in the sixth message;

When the first device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
The method according to any one of claims 31 to 33, wherein the third timestamp information carried in the eighth packet includes:

The first device carries the third time stamp information in a third protocol field included in the eighth message;

When the first device is a terminal device, the third protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the third protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A synchronization method, comprising:

After the second device receives the first message from the access device, it sends the first message to the fourth device, and determines fifth time stamp information, where the fifth time stamp information is sent by the second device to the The time in the mobile network when the fourth device sends the first message;

After receiving the ninth message from the access device, the second device sends a twelfth message to the fourth device based on the ninth message; the ninth message carries a first time stamp Information, the first time stamp information is a time in the mobile network when the first device receives the first message from a third device;

Receiving, by the second device, a fourth message from the fourth device, and determining sixth time stamp information, where the sixth time stamp information is in a mobile network when the second device receives the fourth message The moment

Sending, by the second device, the fourth message to the access device;

Receiving, by the second device, a tenth message from the access device; the tenth message carries second time stamp information, and the second time stamp information is that the access device sends the fourth message The time in the mobile network when the first device sends the fourth message to the third device after the text is sent to the first device;

The second device sends a thirteenth message to the fourth device, and determines seventh time stamp information; the seventh time stamp information is that the second device sends the tenth message to the fourth device Moments in the mobile network at three message times;

The second device receives an eleventh message from the access device, the eleventh message carries third time stamp information and fourth time stamp information, and the third time stamp information is the first time stamp information A moment in the mobile network when a device receives the fifth message from the third device, and the fourth time stamp information is when the third device sends the fifth message to the first device Moments in Ethernet networks;

The second device according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, the sixth Determining the eighth timestamp information with the timestamp information and the seventh timestamp information;

The second device sends the eighth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the eighth time stamp information.
The method according to claim 35, wherein after the second device receives a ninth message from the access device, the method further comprises:

Extracting, by the second device, the first time stamp information carried in a fourth protocol field included in the ninth message;

When the second device is a user plane network element, the fourth protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the fourth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
The method according to claim 35 or 36, wherein after the second device receives a tenth message from the access device, the method further comprises:

Extracting, by the second device, the second time stamp information carried in a fifth protocol field included in the tenth message;

When the second device is a user plane network element, the fifth protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the fifth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
The method according to any one of claims 35 to 37, wherein after the second device receives an eleventh message from the access device, the method further comprises:

Extracting, by the second device, the third time stamp information carried in a sixth protocol field included in the eleventh message;

When the second device is a user plane network element, the sixth protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the sixth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

The first device sends a first message to the access device, and determines first time stamp information and second time stamp information; the first time stamp information is an Ethernet network when the first device sends the first message. The second time stamp is the time in the mobile network when the first device sends the first message;

Sending, by the first device, a second message to the access device, where the second message carries the first time stamp information and the second time stamp information;

Receiving, by the first device, a third message from the access device, and determining third time stamp information, where the third time stamp information is in an Ethernet network when the first device receives the third message The moment

Sending, by the first device, a fourth message to the access device, and determining fourth timestamp information; the fourth timestamp information is in the Ethernet network when the first device sends the fourth message At time, the fourth message carries the third time stamp information;

Sending, by the first device, a fifth message to the access device, where the fifth message carries the fourth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 39, wherein the second message carrying the second time stamp information comprises:

The first device carries the second time stamp information in a first protocol field included in the second message;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A synchronization method, comprising:

The second device receives the first message from the access device, and determines fifth time stamp information and sixth time stamp information, where the fifth time stamp information is Ethernet when the second device receives the first message. The time in the network, the sixth time stamp information is the time in the mobile network when the second device receives the first message;

Receiving, by the second device, a sixth message from the access device, where the sixth message carries first time stamp information and the second time stamp information; the first time stamp information is the first time stamp information; A time in the Ethernet network when a device sends the first message to the access device, and the second time stamp information is the time when the first device sends the first message to the access device and moves Moments in the network;

Sending, by the second device, a third message to the access device, and determining seventh timestamp information, where the seventh timestamp information is in an Ethernet network when the second device sends the third message time;

Receiving, by the second device, a fourth message from the access device, and determining eighth time stamp information, where the eighth time stamp information is in an Ethernet network when the second device receives the fourth message Time; the fourth message carries third timestamp information, and the third timestamp information is after the access device receives the third message from the second device, and sends it to the first The time in the Ethernet network when the first device receives the third message after the device forwards the third message;

Receiving, by the second device, a fifth message from the access device, the fifth message carrying fourth timestamp information, where the fourth timestamp information is the first device to the access device The time in the Ethernet network when the fourth message is sent;

The second device according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, the sixth Timestamp information, the seventh timestamp information, and the eighth timestamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 41, wherein the second device is based on the first timestamp information, the second timestamp information, the third timestamp information, and the fourth timestamp information , The fifth time stamp information, the sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a time offset between the first device and the second device, include:

Determining, by the second device, a ninth timestamp based on the second timestamp information, the third timestamp information, the sixth timestamp information, the seventh timestamp information, and the eighth timestamp information information;

Deleting, by the second device, the fourth time stamp information, and determining a time in the Ethernet network when the first device sends the fourth message to the access device according to the ninth time stamp information;

The second device according to the first time stamp information, the third time stamp information, the fifth time stamp information, the seventh time stamp information, the eighth time stamp information, and the ninth time The time stamp information determines a time offset between the first device and the second device.
The method according to claim 41 or 42, after the second device receives a sixth message from the access device, the method further comprises:

Extracting, by the second device, the second time stamp information carried in a second protocol field included in the sixth packet;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

After receiving the first message from the third device, the first device sends the first message to the second device through the access device, and determines first time stamp information, where the first time stamp information is the first The moment in the mobile network when the device receives the first message;

After the first device receives a second message from the access device, it sends a third message to the third device; the second message carries second time stamp information and third time stamp information, The second timestamp information is the time in the mobile network when the second device sends the first message to the fourth device after receiving the first message; the third timestamp information The moment in the mobile network when the second device receives the fifth message from the fourth device;

Determining, by the first device, fourth timestamp information, where the fourth timestamp information is a time in the mobile network when the first device sends the third message;

Receiving, by the first device, a sixth message from the third device, where the sixth message carries fifth time stamp information, and the fifth time stamp information is that the third device receives the first message The time in the Ethernet network when the third message sent by the device is;

Determining, by the first device, sixth time stamp information according to the first time stamp information, second time stamp information, third time stamp information, fourth time stamp information, and fifth time stamp information;

The first device forwards the sixth time stamp information to the second device through the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 44, wherein the first device is based on the first timestamp information, the second timestamp information, the third timestamp information, and the fourth timestamp information Determining the sixth timestamp information with the fifth timestamp information includes:

Determining, by the first device, between the first device and the second device according to the first time stamp information, the second time stamp information, the third time stamp information, and the fourth time stamp information. Round-trip transmission delay difference between rounds;

The first device calculates a sum of a time corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.
The method according to claim 44 or 45, wherein after the first device receives a second message from the access device, the method further comprises:

Extracting, by the first device, the second time stamp information and the third time stamp information carried in a first protocol field included in the second message;

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

After receiving the first message from the access device, the second device sends the first message to the fourth device, and determines second time stamp information, where the second time stamp information is sent by the second device to the second device. The moment in the mobile network when the first message is;

Receiving, by the second device, a fifth message from the fourth device, and determining third time stamp information, where the third time stamp information is the movement when the second device receives the fifth message Moments in the network;

Sending, by the second device, a fourth message to the access device, where the fourth message carries the second time stamp information and the third time stamp information;

Receiving, by the second device, sixth time stamp information from the access device, and sending the sixth time stamp information to the fourth device, so that the fourth device performs Time synchronization.
The method according to claim 47, wherein the fourth message carrying the second timestamp information and the third timestamp information comprises:

Carrying, by the second device, the second time stamp information and the third time stamp information in a second protocol field included in the fourth message;

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A synchronization method, comprising:

Receiving, by a first device, a first message from a third device, and determining first time stamp information, where the first time stamp information is a time in a mobile network when the first device receives the first message;

Sending, by the first device, a second message to the access device based on the first message, where the second message carries the first time stamp information;

After receiving the third message from the access device, the first device sends the third message to the third device, and determines second time stamp information, where the second time stamp information is the The time in the mobile network when the first device sends the third message;

Receiving, by the first device, a fourth message from the third device, the fourth message carrying third time stamp information, and the third time stamp information is that the third device receives the first message The time in the Ethernet network when the third message sent by the device is;

Sending, by the first device, the second time stamp information and the third time stamp information to the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 49, wherein the carrying of the first timestamp information in the second message comprises:

The first device carries the first time stamp information in a first protocol field included in the second message;

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the first device is a terminal device, the first protocol field is in a service data protocol SDAP field or a data aggregation protocol PDCP field.
A synchronization method, comprising:

The second device receives a fifth message from the access device, and the fifth message carries first timestamp information; the first timestamp information is when the first device receives the first message from the third device Moments in the network;

Sending, by the second device, a sixth message to a fourth device, and determining fourth timestamp information, where the fourth timestamp information is in the mobile network when the second device sends the sixth message time;

Receiving, by the second device, a third message from the fourth device, and determining fifth time stamp information; the fifth time stamp information is the movement when the second device receives the third message Moments in the network;

Sending, by the second device, the third message to the access device;

Receiving, by the second device, second time stamp information and third time stamp information from the access device; the second time stamp information is that the third message is received by the access device and sent to the first device; After a device sends the third message, the time in the mobile network when the first device sends the third message to the third device; the third time stamp information is received by the third device To the time in the Ethernet network when the third message sent by the first device is;

Determining, by the second device, a sixth timestamp according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, and the fifth timestamp information information;

Sending, by the second device, the sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The method according to claim 51, wherein the second device is based on the first timestamp information, the second timestamp information, the third timestamp information, and the fourth timestamp information Determining the sixth timestamp information with the fifth timestamp information includes:

Determining, by the second device, between the first device and the second device according to the first timestamp information, the second timestamp information, the fourth timestamp information, and the fifth timestamp information Round-trip transmission delay difference between rounds;

The second device calculates a sum of a time corresponding to the third time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.
The method according to claim 51 or 52, wherein after the second device receives the fifth message from an access device, the method further comprises:

Extracting, by the second device, the first time stamp information carried in a second protocol field included in the fifth message;

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A first device, comprising:

A receiving unit, configured to receive a first message from a third device;

A processing unit, configured to determine first time stamp information, where the first time stamp information is a time in a mobile network when the first device receives the first message;

A sending unit, configured to send the first packet to a second device through an access device;

The receiving unit is further configured to receive a second message from the third device;

The sending unit is further configured to send a third message to the access device based on the second message, where the third message carries the first time stamp information;

The receiving unit is further configured to receive a fourth message from the access device;

The sending unit is further configured to send the fourth message to the third device;

The processing unit is further configured to determine second time stamp information, where the second time stamp information is a time in a mobile network when the first device sends the fourth message to the third device;

The receiving unit is further configured to receive a fifth message from the third device;

The processing unit is further configured to determine third time stamp information, where the third time stamp information is a time in the mobile network when the first device receives the fifth message;

The sending unit is further configured to send a sixth message to the access device based on the fifth message, where the sixth message carries the second time stamp information;

The receiving unit is further configured to receive a seventh message from the third device; the seventh message carries fourth timestamp information, and the fourth timestamp information is sent from the third device to the third device. The time in the Ethernet network when the first device sends the fifth message;

The sending unit is further configured to send an eighth message to the access device; the eighth message carries the third time stamp information and the fourth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 54, wherein when the third message carries the first time stamp information, the sending unit is specifically configured to:

Carrying the first timestamp information in a first protocol field included in the third message;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field.
The first device according to claim 54 or 55, wherein when the sixth packet carries the second time stamp information, the sending unit is specifically configured to:

Carrying the second timestamp information in a second protocol field included in the sixth message;

When the first device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
The first device according to any one of claims 54-56, wherein when the third time stamp information is carried in the eighth message, the sending unit is specifically configured to:

Carrying the third time stamp information in a third protocol field included in the eighth message;

When the first device is a terminal device, the third protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the third protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A second device, comprising:

A receiving unit, configured to receive a first message from an access device;

A sending unit, configured to send the first message to a fourth device;

A processing unit, configured to determine fifth time stamp information, where the fifth time stamp information is a time in a mobile network when the second device sends the first message to the fourth device;

The receiving unit is further configured to receive a ninth message from the access device; the ninth message carries first time stamp information, where the first time stamp information is The moment in the mobile network when the device receives the first message;

The sending unit is further configured to send a twelfth message to the fourth device based on the ninth message;

The receiving unit is further configured to receive a fourth message from the fourth device;

The processing unit is further configured to determine sixth time stamp information, where the sixth time stamp information is a time in the mobile network when the second device receives the fourth message;

The sending unit is further configured to send the fourth message to the access device;

The receiving unit is further configured to receive a tenth message from the access device; the tenth message carries second time stamp information, where the second time stamp information The time in the mobile network when the fourth device sends the fourth message to the first device after the fourth message is sent to the first device;

The sending unit is further configured to send a thirteenth message to the fourth device;

The processing unit is further configured to determine seventh timestamp information; the seventh timestamp information is a time in the mobile network when the second device sends the thirteenth message to the fourth device;

The receiving unit is further configured to receive an eleventh message from the access device, where the eleventh message carries third time stamp information and fourth time stamp information, and the third time stamp information is The time in the mobile network when the first device receives the fifth message from the third device, and the fourth time stamp information is that the third device sends the fifth device to the first device The time in the Ethernet network when the message was sent;

The processing unit is further configured to: according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, Determining the sixth time stamp information and the seventh time stamp information, and determining the eighth time stamp information;

The sending unit is further configured to send the eighth timestamp information to the fourth device, so that the fourth device performs time synchronization based on the eighth timestamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The second device according to claim 58, wherein the processing unit is further configured to:

After the receiving unit receives a ninth message from the access device, extracting the first time stamp information carried in a fourth protocol field included in the ninth message;

When the second device is a user plane network element, the fourth protocol field is a General Packet Radio Service GPRS Tunneling Protocol GTP field; or

When the second device is a terminal device, the fourth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
The second device according to claim 58 or 59, wherein the processing unit is further configured to:

After the receiving unit receives a tenth message from the access device, extracting the second time stamp information carried in a fifth protocol field included in the tenth message;

When the second device is a user plane network element, the fifth protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the fifth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
The second device according to any one of claims 58 to 60, wherein the processing unit is further configured to:

After the receiving unit receives an eleventh message from the access device, extracting the third time stamp information carried in a sixth protocol field included in the eleventh message;

When the second device is a user plane network element, the sixth protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the sixth protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A first device, comprising:

A sending unit, configured to send a first message to the access device;

A processing unit, configured to determine first time stamp information and second time stamp information; the first time stamp information is a time in the Ethernet network when the first device sends the first message, and the second time The stamp information is the time in the mobile network when the first device sends the first message;

The sending unit is further configured to send a second message to the access device, where the second message carries the first time stamp information and the second time stamp information;

A receiving unit, configured to receive a third message from the access device;

The processing unit is further configured to determine third time stamp information, where the third time stamp information is a time in the Ethernet network when the first device receives the third message;

The sending unit is further configured to send a fourth message to the access device, where the fourth message carries the third time stamp information;

The processing unit is further configured to determine fourth timestamp information; the fourth timestamp information is a time in the Ethernet network when the first device sends the fourth message;

The sending unit is further configured to send a fifth message to the access device, where the fifth message carries the fourth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 62, wherein when the second packet carries the second time stamp information, the sending unit is specifically configured to:

Carrying the second timestamp information in a first protocol field included in the second message;

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A second device, comprising:

A receiving unit, configured to receive a first message from an access device;

A processing unit, configured to determine fifth timestamp information and sixth timestamp information, where the fifth timestamp information is a time in the Ethernet network when the second device receives the first packet, and the sixth The time stamp information is the time in the mobile network when the second device receives the first message;

The receiving unit is further configured to receive a sixth message from the access device, where the sixth message carries the first time stamp information and the second time stamp information; the first time stamp information is The time in the Ethernet network when the first device sends the first message to the access device, and the second time stamp information is the first device sending the first message to the access device Moments in time mobile networks;

A sending unit, configured to send a third message to the access device;

The processing unit is further configured to determine seventh timestamp information, where the seventh timestamp information is a time in the Ethernet network when the second device sends the third message;

The receiving unit is further configured to receive a fourth message from the access device; the fourth message carries third timestamp information, and the third timestamp information is obtained from the access device from the access device. After the second device receives the third message and forwards the third message to the first device, the time in the Ethernet network when the first device receives the third message;

The processing unit is further configured to determine eighth time stamp information, where the eighth time stamp information is a time in the Ethernet network when the second device receives the fourth message;

The receiving unit is further configured to receive a fifth message from the access device, where the fifth message carries fourth timestamp information, and the fourth timestamp information is sent from the first device to the The time in the Ethernet network when the access device sends the fourth message;

The processing unit is further configured to: according to the first timestamp information, the second timestamp information, the third timestamp information, the fourth timestamp information, the fifth timestamp information, The sixth time stamp information, the seventh time stamp information, and the eighth time stamp information determine a time deviation between the first device and the second device, and perform time synchronization according to the time deviation;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The second device according to claim 64, wherein the processing unit, in accordance with the first timestamp information, the second timestamp information, the third timestamp information, and the fourth The timestamp information, the fifth timestamp information, the sixth timestamp information, the seventh timestamp information, and the eighth timestamp information determine the time between the first device and the second device. When the time is offset, it is specifically used for:

Determining ninth time stamp information according to the second time stamp information, the third time stamp information, the sixth time stamp information, the seventh time stamp information, and the eighth time stamp information;

Deleting the fourth time stamp information, and determining a time in the Ethernet network when the first device sends the fourth message to the access device according to the ninth time stamp information;

Determining a location according to the first timestamp information, the third timestamp information, the fifth timestamp information, the seventh timestamp information, the eighth timestamp information, and the ninth timestamp information The time deviation between the first device and the second device.
The second device according to claim 64 or 65, wherein the processing unit is further configured to:

After the receiving unit receives a sixth message from the access device, extracting the second time stamp information carried in a second protocol field included in the sixth message;

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A first device, comprising:

A receiving unit, configured to receive a first message from a third device;

A sending unit, configured to send the first packet to a second device through an access device;

A processing unit, configured to determine first time stamp information, where the first time stamp information is a time in a mobile network when the first device receives the first message;

The receiving unit is further configured to receive a second message from the access device; the second message carries second time stamp information and third time stamp information, and the second time stamp information is the After the second device receives the first message, the time in the mobile network when the first message is sent to the fourth device; the third timestamp information is that the second device is from the fourth device The moment in the mobile network when the fifth message is received;

The sending unit is further configured to send a third message to the third device;

The processing unit is further configured to determine fourth time stamp information, where the fourth time stamp information is a time in the mobile network when the first device sends the third message;

The receiving unit is further configured to receive a sixth message from the third device, where the sixth message carries fifth time stamp information, where the fifth time stamp information is received by the third device. The time in the Ethernet network when the third message sent by the first device is described;

The processing unit is further configured to determine sixth timestamp information according to the first, second, third, fourth, and fifth timestamp information;

The sending unit is further configured to forward the sixth timestamp information to the second device through the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 67, wherein the processing unit, in accordance with the first time stamp information, the second time stamp information, the third time stamp information, and the fourth When the timestamp information and the fifth timestamp information determine the sixth timestamp information, it is specifically used to:

Determining a round-trip transmission time between the first device and the second device according to the first time stamp information, the second time stamp information, the third time stamp information, and the fourth time stamp information Delay difference

Calculating the sum of the time corresponding to the fifth time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.
The first device according to claim 67 or 68, wherein the processing unit is further configured to:

After the receiving unit receives a second message from the access device, extracting the second time stamp information and the third time stamp information carried in a first protocol field included in the second message;

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the first device is a terminal device, the first protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field.
A second device, comprising:

A receiving unit, configured to receive a first message from an access device;

A sending unit, configured to send the first message to a fourth device;

A processing unit, configured to determine second time stamp information, where the second time stamp information is a time in a mobile network when the second device sends the first message;

The receiving unit is further configured to receive a fifth message from the fourth device;

The processing unit is further configured to determine third time stamp information, where the third time stamp information is a time in the mobile network when the second device receives the fifth message;

The sending unit is further configured to send a fourth message to the access device, where the fourth message carries the second time stamp information and the third time stamp information;

The receiving unit is further configured to receive sixth time stamp information from the access device;

The sending unit is further configured to send the sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The second device according to claim 70, wherein when the fourth message carries the second time stamp information and the third time stamp information, the sending unit is specifically configured to:

Carrying the second timestamp information and the third timestamp information in a second protocol field included in the fourth packet;

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A first device, comprising:

A receiving unit, configured to receive a first message from a third device;

A processing unit, configured to determine first time stamp information, where the first time stamp information is a time in a mobile network when the first device receives the first message;

A sending unit, configured to send a second message to the access device based on the first message, where the second message carries the first time stamp information;

The receiving unit is further configured to receive a third message from the access device;

The sending unit is further configured to send the third message to the third device;

The processing unit is further configured to determine second time stamp information, where the second time stamp information is a time in the mobile network when the first device sends the third message;

The receiving unit is further configured to receive a fourth message from the third device, where the fourth message carries third timestamp information, and the third timestamp information is received by the third device. The time in the Ethernet network when the third message sent by the first device is described;

The sending unit is further configured to send the second timestamp information and the third timestamp information to the access device;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The first device according to claim 72, wherein, when the first time stamp information is carried in the second message, the sending unit is specifically configured to:

Carrying the first timestamp information in a first protocol field included in the second message;

When the first device is a user plane network element, the first protocol field is a general packet radio service GPRS tunneling protocol GTP field; or

When the first device is a terminal device, the first protocol field is in a service data protocol SDAP field or a data aggregation protocol PDCP field.
A second device, comprising:

A receiving unit, configured to receive a fifth message from the access device, where the fifth message carries first timestamp information; the first timestamp information is the first message received by the first device from the third device Time in the mobile network;

A sending unit, configured to send a sixth message to the fourth device;

A processing unit, configured to determine fourth time stamp information, where the fourth time stamp information is a time in the mobile network when the second device sends the sixth message;

The receiving unit is further configured to receive a third message from the fourth device;

The processing unit is further configured to determine fifth timestamp information; the fifth timestamp information is a time in the mobile network when the second device receives the third message;

The sending unit is further configured to send the third message to the access device;

The receiving unit is further configured to receive second timestamp information and third timestamp information from the access device; the second timestamp information is the third message received by the access device and sent to the After the first device sends the third message, the time in the mobile network when the first device sends the third message to the third device; the third time stamp information is the first The time in the Ethernet network when the three devices receive the third message sent by the first device;

The processing unit is further configured to determine sixth timestamp information according to the first, second, third, fourth, and fifth timestamp information;

The sending unit is further configured to send the sixth time stamp information to the fourth device, so that the fourth device performs time synchronization based on the sixth time stamp information;

The first device is a user plane network element and the second device is a terminal device, or the first device is a terminal device and the second device is a user plane network element.
The second device according to claim 74, wherein the processing unit, in accordance with the first timestamp information, the second timestamp information, the third timestamp information, and the fourth When the timestamp information and the fifth timestamp information determine the sixth timestamp information, it is specifically used to:

Determining a round-trip transmission time between the first device and the second device according to the first time stamp information, the second time stamp information, the fourth time stamp information, and the fifth time stamp information Delay difference

Calculate the sum of the time corresponding to the third time stamp information and the round-trip transmission delay difference value to obtain the sixth time stamp information.
The second device according to claim 74 or 75, wherein the processing unit is further configured to:

After the receiving unit receives the fifth message from the access device, extract the first time stamp information carried in a second protocol field included in the fifth message;

When the second device is a terminal device, the second protocol field is a service data protocol SDAP field or a data aggregation protocol PDCP field; or

When the second device is a user plane network element, the second protocol field is a general packet radio service GPRS tunneling protocol GTP field.
A computer storage medium, characterized in that instructions are stored in the computer-readable storage medium, and when it is run on a computer, the computer is caused to execute any one of claims 1-16 or 31-53. Methods.
An apparatus, characterized in that the apparatus includes a processor and a memory;

The memory is configured to store a computer execution instruction, and when the device is running, the processor executes the computer execution instruction stored in the memory, so that the device executes the instructions in claims 1-16 or 31-53 Any of the methods described.
A computer program product containing instructions, which, when run on a computer, causes the computer to perform the method described in any one of 1-16 or 31-53 above.