WO2018076651A1

WO2018076651A1 - Time synchronization method, device and computer storage medium

Info

Publication number: WO2018076651A1
Application number: PCT/CN2017/082636
Authority: WO
Inventors: 陈宗正; 李龙龙
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2016-10-31
Filing date: 2017-04-28
Publication date: 2018-05-03
Also published as: CN108023656A

Abstract

Disclosed in embodiments of the present invention are a time synchronization method, a device and a computer storage medium: acquiring a first time stamp of a second time processing unit of a second device sending a first report; determining a residence time between the second device and a first device in the first report as a first time; determining a second time stamp of a first time processing unit of the first device receiving the first report and a third time stamp of the first time processing unit sending a second report; acquiring a fourth time stamp of the second time processing unit receiving the second report, and acquiring a residence time of the second report between the first device and the second device as a second time; determining a compensation time according to the first time stamp, the second time stamp, the third time stamp, the fourth time stamp, the first time and the second time; configuring the compensation time to the first device, so as to synchronize time of the first device with time of the second device.

Description

Time synchronization method, device and computer storage medium

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 31, 2016, the filing date of

Technical field

The present invention relates to the field of flexible Ethernet, and in particular to a time synchronization method, device and computer storage medium.

Background technique

With the development of mobile communication networks, strict synchronization needs to be maintained between base stations to ensure the normal operation of services. However, clock synchronization has not met the requirements of various services, and high-precision time synchronization has become a necessary requirement of the network.

Most of the existing deployed networks use the Global Positioning System (GPS) as a precise time source to ensure time synchronization between nodes in the network. Large-scale deployment of GPS will have cost and security issues. Therefore, using the bearer and transport network itself to transmit time information, only a small amount of GPS or other precision system is installed at the core node to provide the time source, and the time passed by other nodes of the network. Information is synchronized to the primary time source and becomes a necessary requirement for the transport network. FLEXE is the latest Ethernet form, and FLEXE will be used more and more to deliver services in the future. Therefore, implementing FLEXE to complete network time synchronization is an urgent problem to be solved.

Summary of the invention

Embodiments of the present invention provide a time synchronization method, device, and computer storage medium, which can implement high-precision time synchronization between devices.

The technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a time synchronization method, where the method is applied to a first device, where the method includes:

Obtaining a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message;

Determining a first time, the first time indicating a dwell time of the first message between the second device and the first device;

Determining a second timestamp indicating a time at which the first time processing unit of the first device receives the first message, the third timestamp indicating the first time Time when the time processing unit sends the second message;

Obtaining a fourth timestamp indicating a time when the second time processing unit receives the second message, and the second time indicating that the second message is in the a dwell time between a device and the second device;

Determining a compensation time according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time;

The compensation time is configured to the first device such that the time of the first device synchronizes the time of the second device.

In an embodiment, the acquiring the first timestamp includes:

Receiving at least one overhead frame sent by the second device, extracting each byte of the first packet in the at least one overhead frame, and combining each byte to obtain the first packet, The first packet carries the first timestamp, the modified domain of the first packet carries a first camp time, and the first camp time indicates that the first packet is in the second device Second a dwell time between the time processing unit and the second service processing unit of the second device;

The determining the first time includes:

Determining that the first message is from a first service processing unit of the first device to a time of the first time processing unit to a second dwell time, and writing the second dwell time The correction field of the second packet, obtaining the first time according to the first dwell time and the second dwell time;

Determining the second timestamp and the third timestamp, including:

And when the first packet is sent to the first time processing unit, the second time stamp is identified by the first packet;

Generating the second packet, and identifying, by the second packet, a third timestamp;

Obtaining the fourth timestamp and the second time, including:

Receiving a third packet sent by the second device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the second time.

In an embodiment, after the generating the second packet and the third packet identifying the third timestamp, the method includes:

Determining, by the second packet, a dwell time between the first time processing unit and the first service processing unit of the first device as a third dwell time, and writing the third dwell time a correction field of the second packet, so that the second device determines the second time according to the third camp time;

Inserting, in byte order, all bytes of the second packet into a configuration reserved bit of at least one overhead frame, and transmitting the at least one overhead frame to the second device, where each overhead frame is inserted into the One byte of the second message.

In an embodiment, the determining that the first message is from the first service processing unit of the first device to the first time processing unit is a second dwell time, including:

Determining that the time when the first packet is transmitted to the first service processing unit is a first time letter interest;

Determining, that the time when the first packet is transmitted to the first time processing unit is second time information;

Determining, according to the first time information and the second time information, that a dwell time of the first packet from the first service processing unit to the first time processing unit is a second dwell time .

In an embodiment, the determining, by the second time, the dwell time between the first time processing unit and the first service processing unit of the first device is a third dwell time, including:

Determining, that the time when the second packet is sent out by the first time processing unit is third time information;

Determining, that the time when the second packet is sent out by the first service processing unit is fourth time information;

Determining, according to the third time information and the fourth time information, a dwell time between the first time processing unit and the first service processing unit as a third dwell time .

In an embodiment, the determining that the first packet is sent to the first service processing unit is the first time information, including:

When the first service processing unit detects the frame header of the overhead frame, sampling the time at the frame header of the overhead frame as a first value, and sampling the frame number at the frame header of the overhead frame as a second value;

Sampling the frame number of the overhead frame in which the first byte of the first packet is located is a third value;

Determining the first time information based on the first value, the second value, and the third value.

In an embodiment, the determining that the second packet is sent out of the first service processing unit is the fourth time information, including:

The time at the frame header of the sampling overhead frame is a fourth value, and the frame header of the overhead frame is sampled. The frame number is the fifth value;

Determining, that the frame number of the overhead frame in which the first byte of the second packet is located is a sixth value;

The fourth time information is determined based on the fourth value, the fifth value, and the sixth value.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the time synchronization method applied to the first device according to the embodiment of the present invention. .

An embodiment of the present invention provides a time synchronization method, where the method is applied to a second device, where the method includes:

Generating a first packet, the first timestamp indicating a first timestamp, and the first timestamp indicating a time when the second time processing unit of the second device sends the first packet;

Determining, by the first camp, a dwell time between the second time processing unit of the second device and the second service processing unit of the second device as a first dwell time, the first station Writing a time to write the correction field of the second message;

Sending the first packet to the first device.

In an embodiment, the method further includes:

Receiving at least one overhead frame sent by the first device, extracting each byte of the second packet in the at least one overhead frame, and combining each of the bytes to obtain the second packet, The second packet carries a third timestamp, where the third timestamp indicates the time when the first time processing unit of the first device sends the second packet, and the modified domain of the second packet carries a third dwell time, where the third dwell time indicates a dwell time between the first time processing unit and the first service processing unit of the first device;

Determining that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time, and writing the fourth dwell time to the second a correction field of the message, obtaining the second time according to the third dwell time and the fourth dwell time;

And identifying, by the second timestamp, a fourth timestamp, where the fourth timestamp indicates a time when the second time processing unit receives the second message;

Generating a third packet, and sending the third packet to the first device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the second time.

In an embodiment, the determining, by the first message, a dwell time between the second time processing unit of the second device and the second service processing unit of the second device is a first resident Time, including:

Determining, that the time when the first packet is sent out by the second time processing unit is fifth time information;

The time at the frame header of the sampling overhead frame is a seventh value, and the frame number at the frame header of the sampling the overhead frame is an eighth value, and the frame number of the overhead frame in which the first byte of the first packet is located is determined. a ninth value, determining, according to the seventh value, the eighth value, and the ninth value, that the time when the first packet is sent out to the second service processing unit is the sixth time information;

Determining, according to the fifth time information and the sixth time information, a dwell time of the first packet between the second time processing unit and the second service processing unit as a first dwell time .

In an embodiment, the determining that the second message is from the second service processing unit to the second time processing unit is a fourth dwell time, including:

Determining, that the time when the second packet is transmitted to the second service processing unit is seventh time information;

Determining that the time when the second packet is transmitted to the second time processing unit is eighth time information;

Determining, according to the seventh time information and the eighth time information, that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time .

In an embodiment, the sending the first packet to the first device includes:

Inserting, in byte order, all bytes of the first packet into a configuration reserved bit of at least one overhead frame, and transmitting the at least one overhead frame to the first device, where each overhead frame is inserted into the One byte of the first message.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the time synchronization method applied to the second device according to the embodiment of the present invention. .

An embodiment of the present invention provides a time synchronization device, where the device includes: a first service processing unit, a first time processing unit, and a configuration unit,

The first service processing unit is configured to acquire a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message;

The first time processing unit is configured to determine a first time, where the first time indicates a dwell time between the second device and the first device, and is further configured to determine a second timestamp indicating a time when the first time processing unit of the first device receives the first message, and the third timestamp indicating the first time The time when the processing unit sends the second packet;

The first service processing unit is configured to acquire a fourth timestamp and a second time, where the fourth timestamp indicates a time when the second time processing unit receives the second message, and the second time indication a dwell time of the second message between the first device and the second device;

The configuration unit is configured to determine compensation according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time Time; is further configured to configure the compensation time to the first device such that the time of the first device synchronizes the time of the second device.

In an embodiment, the first service processing unit includes: a first system time stamp processing module, configured to receive at least one overhead frame sent by the second device, and extract the at least one overhead Each of the first packets of the frame is combined to obtain the first packet, and the first packet carries the first timestamp, the first packet The modified domain of the file carries a first camp time, the first camp time indicating that the first packet is in the second time processing unit of the second device and the second service processing unit of the second device Residence time

The first time processing unit is configured to determine that a dwell time of the first packet from the first service processing unit of the first device to the first time processing unit is a second dwell time, It is further configured to write the second dwell time to a correction domain of the second message, and obtain the first time according to the first dwell time and the second dwell time.

The first time processing unit includes: a first time stamping module and a first message generating module,

The first time stamping module is configured to: when the first packet is sent to the first time processing unit, identify the second timestamp of the first packet;

The first packet generating module is configured to generate the second packet, and identify a third timestamp to the second packet.

In an embodiment, the first service processing unit is configured to determine that a dwell time between the first time processing unit and the first service processing unit of the first device is a third dwell time, configured to write the third dwell time to a correction domain of the second message, such that the second device determines the second time according to the third dwell time And configured to insert all bytes of the second packet into a configuration reserved bit of at least one overhead frame in a byte order, and send the at least one overhead frame to the second device, where each overhead The frame is inserted into one byte of the second message.

In an embodiment, the first service processing unit is configured to determine that the time when the first packet is transmitted to the first service processing unit is first time information;

The first time processing unit is configured to determine that the time when the first packet is transmitted to the first time processing unit is second time information, and is further configured to: according to the first time information and the second time Determining that the first message is sent from the first service processing unit to the first The dwell time of the processing unit for a time is the second dwell time;

The first time processing unit is configured to determine that the time when the second packet is sent out by the first time processing unit is third time information;

The first service processing unit is configured to determine that the time when the second packet is sent out of the first service processing unit is fourth time information, and is further configured to: according to the third time information and the fourth time And determining, by the information, that the dwell time of the second packet between the first time processing unit and the first service processing unit is a third dwell time.

In an embodiment, the first service processing unit includes: a first system time stamp sampling module, and a first system time stamp processing module,

The first system timestamp sampling module is configured to: when the first service processing unit detects a frame header of the overhead frame, sample the time at the frame header of the overhead frame as a first value, and sample the overhead frame The frame number at the frame header is a second value; and the frame number of the overhead frame in which the first byte of the first packet is sampled is a third value;

The first system time stamp sampling module is configured to determine first time information according to the first value, the second value, and the third value.

In an embodiment, the first service processing unit includes: a first system time stamp sampling module, a first system time stamp processing module,

The first system timestamp sampling module is configured to: the time at the frame header of the sampling overhead frame is a fourth value, and the frame number at the frame header of the sampling the overhead frame is a fifth value; and the second report is further configured to determine The frame number of the overhead frame in which the first byte of the text is located is the sixth value;

The first system time stamp processing module is configured to determine the fourth time information according to the fourth value, the fifth value, and the sixth value.

The embodiment of the present invention further provides a time synchronization device, where the device includes: a second time processing unit and a second service processing unit, where the second time processing unit includes: a second message generation module, and a second time stamp Module,

The second packet generating module is configured to generate a first packet;

The second time stamping module is configured to identify a first timestamp for the first packet, where the first timestamp indicates that the second time processing unit of the second device sends the first packet time;

The second service processing unit is configured to determine that a dwell time between the second time processing unit of the second device and the second service processing unit of the second device is the first The dwell time is written into the correction domain of the second packet, and is further configured to send the first packet to the first device.

In an embodiment, the second service processing unit is configured to receive at least one overhead frame sent by the first device, and extract each byte of the second packet in the at least one overhead frame, Each of the bytes is combined to obtain the second packet, where the second packet carries a third timestamp, and the third timestamp indicates that the first time processing unit of the first device sends the The time of the second packet, the modified domain of the second packet carries a third camp time, and the third camp time indicates that the second packet is in the first time processing unit and the first device The dwell time between the first business processing units;

The second time processing unit is configured to determine that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time, and is further configured to The fourth dwell time is written into the correction domain of the second packet, and is further configured to obtain the second time according to the third dwell time and the fourth dwell time;

The second time stamping module is configured to identify a fourth timestamp for the second message, where the fourth timestamp indicates a time when the second time processing unit receives the second message;

The second packet generating module is configured to generate a third packet;

The second service processing unit is configured to send the third packet to the first device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the The second time.

In an embodiment, the second time processing unit is configured to determine that the time when the first message is sent out by the second time processing unit is fifth time information;

The second service processing unit is configured to: the time at the frame header of the sampling overhead frame is a seventh value, and the frame number at the frame header of the sampling the overhead frame is an eighth value, and the first packet is determined. The frame number of the overhead frame in which the byte is located is a ninth value, and the first message is sent out to the second service processing unit according to the seventh value, the eighth value, and the ninth value. The time is the sixth time information; and is further configured to determine, according to the fifth time information and the sixth time information, that the first message is in the second time processing unit and the second service processing unit The dwell time between the two is the first dwell time;

The second service processing unit is configured to determine that the time when the second packet is transmitted to the second service processing unit is the seventh time information;

The second time processing unit is configured to determine that the time when the second packet is transmitted to the second time processing unit is eighth time information; and is further configured to: according to the seventh time information and the eighth time Determining, by the information, a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time;

The second service processing unit is configured to receive at least one overhead frame, and further configured to extract each byte of the second packet in the at least one overhead frame, and combine each of the bytes to obtain a Said the second message.

The embodiment of the present invention provides a time synchronization method, a device, and a computer storage medium, which acquires a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message; Determining, by the first time, a dwell time between the second device and the first device; determining a second timestamp and a third timestamp, wherein the second timestamp indicates the first time processing unit of the first device The time when the first message is received, the third timestamp indicates the time when the first time processing unit sends the second message; the fourth timestamp is obtained, and the second timestamp indicates that the second time processing unit receives the second message. Time of the text, the second time indicates that the second message is a dwell time between the first device and the second device; determining a compensation time according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time; The time is configured to the first device such that the time of the first device synchronizes the second device. The time synchronization method and device provided by the embodiment of the present invention obtain timestamp and dwell time of the packet transmission in the first time synchronization device and the second time synchronization device by performing timestamp sampling on the packet transmission process, thereby obtaining The compensation time is used to compensate the first time synchronization device by the compensation time to ensure that the time synchronization of the first time synchronization device synchronizes the time of the second time synchronization device, thereby effectively achieving high-precision time synchronization.

DRAWINGS

In the drawings, which are not necessarily to scale, the Like reference numerals with different letter suffixes may indicate different examples of similar components. The drawings generally illustrate the various embodiments discussed herein by way of example and not limitation.

1 is a schematic flowchart 1 of a time synchronization method according to an embodiment of the present invention;

2 is a second schematic flowchart of a time synchronization method according to an embodiment of the present invention;

3 is a schematic diagram of implementing a FLEXE 1588 time synchronization device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram 1 of a first device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram 2 of a first device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram 1 of a second device according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram 2 of a second device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

The embodiment of the invention provides a time synchronization method. As shown in FIG. 1 , the method may include:

Step 101: Acquire a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first packet.

The time synchronization method provided by the embodiment of the present invention is applied to the first device, that is, the execution entity of the time synchronization method is the first device, and the first device can be understood as the first time synchronization device, and the first time synchronization device can be specifically the base station. Wait.

Specifically, the first device may implement time synchronization of the FLEXE 1588, and the first device may include: a first time processing unit and a first service processing unit.

It should be noted that 1588 is a master-slave synchronization system. During the synchronization process of the system, the master clock periodically issues PTP time synchronization and time information, and receives the timestamp information sent by the master clock port from the clock port. Based on this information, the system calculates the master-slave line time delay and the master-slave time difference. The time difference is used to adjust the local time so that the device time remains at a frequency and phase consistent with the master time. 1588 can achieve both frequency synchronization and phase synchronization.

The first time processing unit includes: a processing CPU module, a message generation module, a 1588 time counting module, a system time counting module, a time stamping module, and a system time stamp processing module.

The first service processing unit includes: a CPU module, a system time counting module, a system time stamp sampling module, and a system time stamp processing module.

In the first time processing unit, the CPU module is mainly used to configure information such as an operation mode of the first device, for example, configuring the first device as a master device or a slave device.

A message generation module is configured to generate and receive a PTP time synchronization message.

The 1588 time counting module and the system time counting module are mainly used to generate time information. The counting clocks of the two are the same, that is, the starting time of the clock and the counting frequency of the clock are the same, and the difference is the 1588 time counting module. The counter can be timed and the counter of the system time counting module cannot be timed.

Time stamping module, mainly used to generate 1588 timestamp.

System time stamp processing module, used to sample the time when the time message is sent to and from the time processing unit The time stamp, together with the time sent by the service processing unit, calculates the dwell time of the time message between the time processing unit and the service processing unit.

In the first service processing unit, the CPU module is mainly used to configure information such as the working mode of the device and the FLEXE overhead position of the time packet.

The system time counting module is mainly used to generate system time information. The counting clock of the system time counting module is the same as the system time counting module clock in the time processing unit, and the counting start time is also the same.

The system time stamp sampling module is mainly used for sampling the frame head time of the FLEXE overhead frame, and calculating the time of the time message at the entrance and exit of the service processing unit; then sending the time to the system time stamp processing module, and transmitting it to the time processing unit. The time together calculates the dwell time of the time message between the time processing unit and the business processing unit.

In the service processing unit, since all bytes of the time message are sequentially inserted into the reserved bits of consecutive multiple FLEXE overhead frames, and each FLEXE overhead frame is only inserted into one byte of the time message. The time at the frame header of the FLEXE overhead frame where the first byte of the time packet is located is taken as the time when the time packet enters and exits the service processing unit.

There is a certain delay between the system timestamp processing module and the service processing unit's gateway. To improve the timing accuracy, the delay needs to be compensated. That is, the second system time stamp processing module needs to calculate the time message at the entrance and exit of the service processing unit. time.

The calculation method is as follows: Since the time for transmitting a FLEXE overhead frame is basically fixed, it can be calculated that each time message is sent from the entry to the system time stamp processing module, or from the system time stamp processing module to the exit. The number of frames, automatically compensated for the number of frames, to get the time of the time message at the entrance or exit.

Specifically, the first device receives the first packet sent by the second device, where the first packet carries the first timestamp, and the modified domain of the first packet carries a first camp time The first dwell time indicates that the first message is in a second time processing unit of the second device and The dwell time between the second service processing units of the second device.

In an embodiment, the receiving the first packet sent by the second device may include:

Receiving at least one overhead frame, extracting each byte of the first packet in the at least one overhead frame, and combining each of the bytes to obtain the first packet.

Step 102: Determine a first time, where the first time indicates a dwell time between the second device and the first device.

Specifically, the first device determines that the camping time of the first packet from the first service processing unit of the first device to the first time processing unit is a second camp time, where the first The second dwell time is written into the correction domain of the second packet, and the first time is obtained according to the first dwell time and the second dwell time.

Determining, that the time when the first packet is sent to the first service processing unit is first time information;

Step 103: Determine a second timestamp and a third timestamp, where the second timestamp indicates a time when the first time processing unit of the first device receives the first message, and the third timestamp indicates that the first time processing unit sends the The time of the second message.

Specifically, when the first packet is sent to the first time processing unit, the first device identifies the second timestamp to the first packet, and generates the second packet to the second The message identifies the third timestamp.

Sending the second packet to the second device.

In an embodiment, the determining that the second packet is sent out of the first service processing unit Time is the fourth time information, including:

The time at the frame header of the sampling overhead frame is a fourth value, and the frame number at the frame header of the sampling the overhead frame is a fifth value;

In an embodiment, the sending the second packet to the second device includes:

Step 104: Obtain a fourth timestamp and a second time, where the fourth timestamp indicates a time when the second time processing unit receives the second message, and the second time indicates that the second message is between the first device and the second device. Dwell time.

Specifically, the acquiring, by the first device, the fourth timestamp and the second time may include: receiving, by the first device, a third packet sent by the second device, where the third packet carries the fourth timestamp, The correction domain of the third message carries the second time.

Step 105: Determine a compensation time according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time.

Specifically, the first timestamp is set to T1, the second timestamp is T2, the third timestamp is T3, the fourth timestamp is T4, the first time is CFs, and the second time is CFd, and the compensation time offset can be determined. for:

Offset=((T2-T1-CFs)-(T4-T3-CFd))/2

Step 106: Configure the compensation time to the first device, so that the time of the first device synchronizes the time of the second device.

Specifically, the first device can configure the compensation time to the self device, that is, the first device can compensate the compensation time by using the software, so that the time of the first device can be synchronized to the second device. On the time.

The time synchronization method provided by the embodiment of the present invention obtains a time stamp and a dwell time transmitted by the packet in the first time synchronization device and the second time synchronization device by performing timestamp sampling on the packet transmission process, thereby obtaining a compensation time. The first time synchronization device is compensated by the compensation time to ensure that the time synchronization of the first time synchronization device synchronizes the time of the second time synchronization device, thereby effectively achieving high-precision time synchronization.

An embodiment of the present invention provides a time synchronization method. As shown in FIG. 2, the method is applied to a second device, where the method includes:

Step 201: Generate a first packet, and identify a first timestamp to the first packet, where the first timestamp indicates a time when the second time processing unit of the second device sends the first packet.

The time synchronization method provided by the embodiment of the present invention is applied to the second device, that is, the execution entity of the time synchronization method is the second device, and the second device can be understood as the second time synchronization device, and the second time synchronization device can be specifically the base station. Wait.

Specifically, the second device may implement time synchronization of the FLEXE 1588, and the second device may include: a second time processing unit and a second service processing unit.

The second time processing unit includes: a processing CPU module, a message generation module, a 1588 time counting module, a system time counting module, a time stamping module, and a system time stamp processing module. The second service processing unit includes: a CPU module, a system time counting module, a system time stamp sampling module, and a system time stamp processing module.

Specifically, the functions implemented by the respective modules in the second time processing unit and the second service processing unit are the same as those in the foregoing first device, and the embodiments are not described herein.

Step 202: Determine a dwell time between the second time processing unit of the second device and the second service processing unit of the second device, where the first message is a first dwell time, where The first dwell time is written to the correction domain of the second message.

Specifically, the second device determines that a dwell time between the second time processing unit of the second device and the second service processing unit of the second device is the first dwell time, Can include:

Determining, that the time when the first packet is sent out by the second service processing unit is sixth time information;

In an embodiment, the determining that the time when the first packet is sent out by the second service processing unit is the sixth time information, including:

The time at the frame header of the sampling overhead frame is a seventh value, and the frame number at the frame header of the sampling the overhead frame is an eighth value;

Determining, that the frame number of the overhead frame in which the first byte of the first packet is located is a ninth value;

The sixth time information is determined based on the seventh value, the eighth value, and the ninth value.

Step 203: Send the first packet to the first device.

Specifically, the second device inserts all the bytes of the first packet into the configuration reserved bits of the at least one overhead frame in a byte order, and sends the at least one overhead frame to the first device, where each An overhead frame is inserted into one byte of the first message.

In an embodiment, the method may further include:

Receiving a second packet sent by the first device, where the second packet carries a third timestamp, the third timestamp indicating that the first time processing unit of the first device sends the second packet Time, the modified domain of the second packet carries a third dwell time, the third dwell time indicating that the second packet is in the first time processing unit and the first device Residence time between business processing units;

In an embodiment, determining that the second packet is transmitted to the second service processing unit is the seventh time information;

When the second service processing unit detects the frame header of the overhead frame, the time at the frame header of the sampling the overhead frame is a tenth value, and the frame number at the frame header of the sampling the overhead frame is the eleventh value. ;

Sampling the frame number of the overhead frame in which the first byte of the second packet is located is the twelfth value;

The seventh time information is determined based on the tenth value, the eleventh value, and the twelfth value.

In an embodiment, the receiving the second packet sent by the first device includes:

Receiving at least one overhead frame, extracting each byte of the second packet in the at least one overhead frame, and combining each of the bytes to obtain the second packet.

Exemplarily, the first device is set to be the device B, and the second device is the device A, that is, the time of the device B is synchronized with the time of the device A, and the master device and the slave device are configured by the CPU. Specifically, the device A is set. The master device is the master device, and the device B is set as the slave device slave. The time synchronization process is as follows:

Exemplarily, as shown in FIG. 3, the message generating module of the time processing unit of the device A generates a sync message, that is, a first message, and the sync message enters a time stamping module, and the synchronization message is sent with a timestamp T1. That is, the first timestamp, T1 can be understood as the time when the sync message enters the time stamping module, and T1 is the timestamp generated by the 1588 time counter module.

Then, the sync message is transmitted to the system time stamp processing module of the time processing unit, and the time stamp t1 generated by the system time counter module is marked, that is, t1 can be understood as the time when the sync message enters the system time stamp processing module, and t1 is accompanied by sync. The message is sent to the service processing device.

The service processing device receives the sync message, and after processing, inserts all the bytes of the sync message into the configuration reserved bit of the FLEXE overhead frame in sequence, and inserts one byte of the sync message into each FLEXE overhead frame.

The processing process of the sync message is: the system time stamp sampling module samples the time d1 and the frame number m1 at the frame header of each FLEXE overhead frame at the exit of the service processing device, and returns the system time stamp processing module to the system time stamp processing module. The module samples the frame number m2 of the FLEXE overhead frame in which the first byte of the sync packet is located, thereby calculating the time t2 of the service packet from the service packet, as follows:

T2=d1+(m2-m1)*C

Where C is the time required to deliver a FLEXE overhead frame, which is a fixed value and can be configured by the CPU.

After obtaining t2, the dwell time Δt1 between the time processing device and the service processing device is calculated, and the calculation method is as follows:

Δt1=t2-t1

And the resident time Δt1 is written into the correction domain of the sync message, that is, the correction field of the sync message is changed to CF2=CF1+Δt1

The device B extracts each byte of the sync packet from the FLEXE overhead frame through the FLEXE interface and forms a complete sync packet, that is, the first packet, and calculates the time at which the sync packet is sent out at the service processing device.

The method for calculating the time of the sync message at the entry of the service processing device is: the frame header of the FLEXE overhead frame sampled by the system time stamp sampling module when the device B service processing unit enters the frame header of the FLEXE overhead frame. The time d2 and the frame number m3 are transmitted to the system time stamp processing module, and the system time stamp processing module samples the frame number m4 of the FLEXE overhead frame in which the first byte of the sync message is located, thereby calculating the sync message on the device B. The time t3 at the entrance of the business processing device is calculated as follows:

T3=d2-(m3-m4)*C

Where C is the time required to deliver a FLEXE overhead frame, which is a fixed value, which can be CPU configuration.

The extracted complete sync message and the calculated sync message are transmitted to the time processing device at time t3 at the entrance of the service processing device.

When receiving the sync message, the time processing device samples the system time t4 when the sync message is received, and calculates the dwell time Δt2 of the sync message from the service processing device entrance to the current time processing device, as shown in the following formula. :

Δt2=t4-t3

After calculating Δt2, the resident time is written into the correction domain of the sync message, that is, the correction field of the sync message becomes: CFs=CF2+Δt2.

Then, the sync message is sent to the time stamping module, and the 1588 timestamp T2 is received when the sync message is received. At this point, the software of device B knows that the timestamp T1 of the device A sends the sync message and the timestamp T2 of the sync message received by itself, and the correction field CFs of the sync message knows that the sync message is on the device A and the device B. The dwell time between the two devices.

The packet generation module of the time processing device in the device B generates a delay request delay_req message, that is, the second message, and the processing process of the delay_req message is the same as the process of processing the sync message by the device A, except that the device B records the The timestamp T3 sent by the delay_req message, and the correction field of the delay_req message becomes CF4=CF3+Δt3.

The device A extracts each byte of the delay_req packet from the FLEXE overhead frame through the FLEXE interface and forms a complete delay_req packet, and calculates the time of the delay_req packet at the entry of the service processing device. The process is the same as the process of the device B processing the sync message, except that the time stamping module of the time processing device is marked with the receiving time stamp T4 of the delay_req message. At the same time, the correction field CFd=CF4+Δt4 of the delay_req message is obtained.

The packet generation module of the time processing device in the device A generates a delay response delay_resp message, that is, a third message, and the delay_resp message carries the 1588 timestamp T4 of the delay_req message and the correction field CFd of the delay_req message. Delay_resp message does not do any timestamp Rationally, it is sent directly through the overhead frame of FLEXE.

Device B extracts the delay_resp packet from the FLEXE overhead frame through the FLEXE interface, and also sends the software directly to device B without any timestamp processing.

The software of the device B obtains the time stamp T1 when the device A sends the sync message and the time stamp T2 that the device receives the sync message, and obtains the time stamp T3 when the device B sends the delay_req message and the device B receives the delay_req message. The T4 is obtained, and the dwell time CFs between the two devices of the device A and the device B is obtained, and the dwell time CFd between the two devices of the device A and the device B is obtained. Through formula

Offset=((T2-T1-CFs)-(T4-T3-CFd))/2

The time difference between device A and device B is obtained, and device B can synchronize the time of device B to the time of device A by software offsetting the offset value.

The FLEXE1588 time synchronization can be implemented by the method provided by the embodiment of the present invention, and the time synchronization between the devices through the FLEXE interface can be realized, and the timing accuracy can be up to the nanosecond level.

It should be noted that the above is one embodiment of the present invention. In fact, in one device, one time processing device may also be connected to multiple service processing devices, that is, time when multiple first devices are time synchronized to the second device. The counting clock of the system time counting module of the plurality of service processing devices is the same as the initial counting time, and can be delivered by the time processing device, and the timing principle is the same as described above.

The embodiment of the present invention provides a time synchronization device. As shown in FIG. 4, the time synchronization device 30 includes: a first service processing unit 301, a first time processing unit 302, and a configuration unit 303, where

The first service processing unit 301 is configured to acquire a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first packet;

The first time processing unit 302 is configured to determine a first time, where the first time indicates a dwell time of the first message between the second device and the first device; Determining a second timestamp and a third timestamp, wherein the second timestamp indicates the first device Receiving, by the first time processing unit, the time of the first packet, where the third timestamp indicates a time when the first time processing unit sends the second packet;

The first service processing unit 301 is configured to acquire a fourth timestamp and a second time, where the fourth timestamp indicates a time when the second time processing unit receives the second message, the second time And indicating a dwell time of the second packet between the first device and the second device;

The configuration unit 303 is further configured to: according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time, Determining a compensation time; further configured to configure the compensation time to the first device such that time of the first device synchronizes time of the second device.

In an embodiment, the first service processing unit 301 includes: a first system time stamp processing module 3011, configured to receive the first packet sent by the second device, where the first packet carries The first timestamp, the modified domain of the first packet carries a first camp time, and the first camp time indicates that the first packet is in the second time processing unit and the second device The dwell time between the second service processing units of the second device.

In an embodiment, the first time processing unit 302 is configured to determine a dwell time of the first message from a first service processing unit of the first device to the first time processing unit. And the second dwell time is further configured to write the second dwell time into the correction domain of the second packet, and obtain the first according to the first dwell time and the second dwell time For a time.

In an embodiment, as shown in FIG. 5, the first time processing unit 302 includes: a first time stamping module 3021, and a first packet generating module 3022.

The first time stamping module 3021 is configured to: when the first packet is sent to the first time processing unit, identify a second timestamp for the first packet;

The first packet generating module 3022 is configured to generate the second packet, and identify the second packet with the third timestamp.

In an embodiment, the first service processing unit 301 is configured to determine a dwell time between the first time processing unit and the first service processing unit of the first device. a third dwell time, further configured to write the third dwell time to a correction domain of the second message, such that the second device determines the second according to the third dwell time Time; configured to send the second message to the second device.

In an embodiment, the first service processing unit 301 is configured to receive a third packet sent by the second device, where the third packet carries the fourth timestamp, and the third packet The correction domain carries the second time.

In an embodiment, the first service processing unit 301 is configured to determine that the time when the first packet is transmitted to the first service processing unit is first time information;

The first time processing unit 302 is configured to determine that the time when the first packet is sent to the first time processing unit is second time information, and is further configured to: according to the first time information and the second The time information determines that the dwell time of the first message from the first service processing unit to the first time processing unit is a second dwell time.

In an embodiment, the first time processing unit 302 is configured to determine that the time when the second message is sent out by the first time processing unit is third time information;

The first service processing unit 301 is configured to determine that the time when the second packet is sent out of the first service processing unit is fourth time information, and is further configured to be based on the third time information and the fourth The time information determines that the dwell time of the second message between the first time processing unit and the first service processing unit is a third dwell time.

In an embodiment, as shown in FIG. 5, the first service processing unit 301 includes: a first system time stamp sampling module 3012, and a first system time stamp processing module 3011.

The first system timestamp sampling module 3012 is configured to: when the first service processing unit detects the frame header of the overhead frame, sample the time at the frame header of the overhead frame as a first value, and sample the overhead. The frame number at the frame header of the frame is a second value; and is further configured to sample the first message first The frame number of the overhead frame in which the bytes are located is the third value;

The first system timestamp processing module 3011 is configured to determine the first time information according to the first value, the second value, and the third value.

In an embodiment, the first service processing unit 301 is configured to receive at least one overhead frame, and is further configured to extract each byte of the first packet in the at least one overhead frame, where each of the One byte is combined to obtain the first message.

The first system timestamp sampling module 3012 is configured to: the time at the frame header of the sampling overhead frame is a fourth value, and the frame number at the frame header of the sampling the overhead frame is a fifth value; and is further configured to determine the second The frame number of the overhead frame in which the first byte of the message is located is the sixth value;

The first system time stamp processing module 3011 is configured to determine the fourth time information according to the fourth value, the fifth value, and the sixth value.

In an embodiment, the first service processing unit 301 is configured to insert all bytes of the second packet into a configuration reserved bit of at least one overhead frame in a byte order, and is further configured to send the At least one overhead frame to the second device, wherein each overhead frame is inserted into one byte of the second message.

For a detailed description of the time synchronization device provided by the embodiment of the present invention, reference may be made to the description of the foregoing time synchronization method embodiment, and details are not described herein again.

The time synchronization device provided by the embodiment of the present invention obtains the time stamp and the dwell time transmitted by the packet in the first time synchronization device and the second time synchronization device by time stamping the packet transmission process, thereby obtaining the compensation time. The first time synchronization device is compensated by the compensation time to ensure that the time synchronization of the first time synchronization device synchronizes the time of the second time synchronization device, thereby effectively achieving high-precision time synchronization.

The embodiment of the invention provides a time synchronization device, as shown in FIG. 6, the time synchronization device The device 40 includes a second time processing unit 401 and a second service processing unit 402. The second time processing unit 401 includes: a second message generating module 4011 and a second time stamping module 4012.

The second packet generating module 4011 is configured to generate a first packet.

The second time stamping module 4012 is configured to identify a first timestamp for the first message, where the first timestamp indicates that the second time processing unit of the second device sends the first timestamp time;

The second service processing unit 401 is configured to determine that a dwell time between the second time processing unit of the second device and the second service processing unit of the second device is The first camp time is written into the correction domain of the second packet, and is configured to send the first packet to the first device.

In an embodiment, the second service processing unit 402 is configured to receive a second packet sent by the first device, where the second packet carries a third timestamp, and the third timestamp indicates a time when the first time processing unit of the first device sends the second packet, where the modified domain of the second packet carries a third camp time, and the third camp time indicates the second packet a dwell time between the first time processing unit and the first service processing unit of the first device;

The second time processing unit 401 is configured to determine that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth camp time, and is further configured to Writing the fourth dwell time to the correction domain of the second packet, further configured to obtain the second time according to the third dwell time and the fourth dwell time;

The second time stamping module 4012 is configured to identify a fourth timestamp for the second message, where the fourth timestamp indicates a time when the second time processing unit receives the second message;

The second packet generating module 4011 is configured to generate a third packet.

The second service processing unit 402 is configured to send the third packet to the first device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the Description The second time.

In an embodiment, the second time processing unit 401 is configured to determine that the time when the first packet is sent out by the second time processing unit is fifth time information;

The second service processing unit 402 is configured to determine that the time when the first packet is sent out by the second service processing unit is sixth time information, and is further configured to be based on the fifth time information and the sixth The time information determines that the dwell time of the first message between the second time processing unit and the second service processing unit is a first dwell time.

In an embodiment, the second service processing unit 402 is configured to determine that the time when the second packet is transmitted to the second service processing unit is the seventh time information;

The second time processing unit 401 is configured to determine that the time when the second packet is transmitted to the second time processing unit is eighth time information; and is further configured to: according to the seventh time information and the eighth The time information is determined to be a fourth dwell time of the second message from the second service processing unit to the second time processing unit.

In an embodiment, as shown in FIG. 7, the second service processing unit 402 includes: a second system time stamp sampling module 4021, and a second system time stamp processing module 4022.

The second system time stamp sampling module 4021 is configured to: the time at the frame header of the sampling overhead frame is a seventh value, and is also used to sample the frame number at the frame header of the overhead frame as an eighth value; The frame number of the overhead frame in which the first byte of the first packet is located is the ninth value;

The second system time stamp processing module 4022 is configured to determine the sixth time information according to the seventh value, the eighth value, and the ninth value.

In an embodiment, the second service processing unit 402 is configured to insert all bytes of the first packet into a configuration reserved bit of at least one overhead frame in a byte order, and is further configured to send the At least one overhead frame to the first device, wherein each overhead frame is inserted into one byte of the first message.

In an embodiment, the second service processing unit 402 is configured to receive at least one overhead. The frame is further configured to extract each byte of the second packet in the at least one overhead frame, and combine each of the bytes to obtain the second packet.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can 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 for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in a flow chart A function specified in a block or blocks of a process or multiple processes and/or block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The embodiment of the present invention provides a time synchronization method, which acquires a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message; and determines the first time, the first time indicates the first time. a dwell time between the second device and the first device; determining a second timestamp and a third timestamp, wherein the second timestamp indicates that the first time processing unit of the first device receives the first message Time, the third timestamp indicates the time when the first time processing unit sends the second message; the fourth timestamp and the second time are obtained, the fourth timestamp indicates the time when the second time processing unit receives the second message, and the second time The time indicates a dwell time of the second message between the first device and the second device; according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time, Determining the compensation time; configuring the compensation time to the first device such that the time of the first device synchronizes the time of the second device. In this manner, by performing timestamp sampling on the packet transmission process, the timestamp and the dwell time of the packet transmitted in the first time synchronization device and the second time synchronization device are obtained, thereby obtaining a compensation time, and the compensation time is first. The time synchronization device performs compensation to ensure that the time of the first time synchronization device synchronizes the time of the second time synchronization device, thereby effectively achieving high-precision time synchronization.

Claims

A time synchronization method, the method being applied to a first device, the method comprising:

Obtaining a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message;

Determining a first time, the first time indicating a dwell time of the first message between the second device and the first device;

Determining a second timestamp indicating a time at which the first time processing unit of the first device receives the first message, the third timestamp indicating the first time Time when the time processing unit sends the second message;

Obtaining a fourth timestamp indicating a time when the second time processing unit receives the second message, and the second time indicating that the second message is in the a dwell time between a device and the second device;

Determining a compensation time according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time;

The compensation time is configured to the first device such that the time of the first device synchronizes the time of the second device.
The method of claim 1, wherein the obtaining the first timestamp comprises:

Receiving at least one overhead frame sent by the second device, extracting each byte of the first packet in the at least one overhead frame, and combining each byte to obtain the first packet, The first packet carries the first timestamp, the modified domain of the first packet carries a first camp time, and the first camp time indicates that the first packet is in the second device a dwell time between the second time processing unit and the second service processing unit of the second device;

The determining the first time includes:

Determining that the first message is from a first service processing unit of the first device to a time of the first time processing unit to a second dwell time, and writing the second dwell time Place Determining a correction field of the second packet, obtaining the first time according to the first dwell time and the second dwell time;

Determining the second timestamp and the third timestamp, including:

And when the first packet is sent to the first time processing unit, the second time stamp is identified by the first packet;

Generating the second packet, and identifying, by the second packet, a third timestamp;

Obtaining the fourth timestamp and the second time, including:

Receiving a third packet sent by the second device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the second time.
The method according to claim 2, wherein after the generating the second packet and the third packet identifying the third timestamp, the method comprises:

Determining, by the second packet, a dwell time between the first time processing unit and the first service processing unit of the first device as a third dwell time, and writing the third dwell time a correction field of the second packet, so that the second device determines the second time according to the third camp time;

Inserting, in byte order, all bytes of the second packet into a configuration reserved bit of at least one overhead frame, and transmitting the at least one overhead frame to the second device, where each overhead frame is inserted into the One byte of the second message.
The method according to claim 2, wherein the determining that the first message is from the first service processing unit of the first device to the first time processing unit is a second station Time to stay, including:

Determining, that the time when the first packet is sent to the first service processing unit is first time information;

Determining, that the time when the first packet is transmitted to the first time processing unit is second time information;

Determining, according to the first time information and the second time information, that a dwell time of the first packet from the first service processing unit to the first time processing unit is a second dwell time .
The method according to claim 3, wherein said determining a dwell time of said second message between said first time processing unit and said first service processing unit of said first device is a third station Time to stay, including:

Determining, that the time when the second packet is sent out by the first time processing unit is third time information;

Determining, that the time when the second packet is sent out by the first service processing unit is fourth time information;

Determining, according to the third time information and the fourth time information, a dwell time between the first time processing unit and the first service processing unit as a third dwell time .
The method of claim 4, wherein the determining that the first message is transmitted to the first service processing unit is the first time information, including:

When the first service processing unit detects the frame header of the overhead frame, sampling the time at the frame header of the overhead frame as a first value, and sampling the frame number at the frame header of the overhead frame as a second value;

Sampling the frame number of the overhead frame in which the first byte of the first packet is located is a third value;

Determining the first time information based on the first value, the second value, and the third value.
The method of claim 5, wherein the determining that the second packet is sent out of the first service processing unit is the fourth time information, including:

The time at the frame header of the sampling overhead frame is a fourth value, and the frame number at the frame header of the sampling the overhead frame is a fifth value;

Determining, that the frame number of the overhead frame in which the first byte of the second packet is located is a sixth value;

The fourth time information is determined based on the fourth value, the fifth value, and the sixth value.
A time synchronization method, the method being applied to a second device, the method comprising:

Generating a first packet, the first timestamp indicating a first timestamp, and the first timestamp indicating a time when the second time processing unit of the second device sends the first packet;

Determining, by the first camp, a dwell time between the second time processing unit of the second device and the second service processing unit of the second device as a first dwell time, the first station Writing a time to write the correction field of the second message;

Sending the first packet to the first device.
The method of claim 8 wherein the method further comprises:

Receiving at least one overhead frame sent by the first device, extracting each byte of the second packet in the at least one overhead frame, and combining each of the bytes to obtain the second packet, The second packet carries a third timestamp, where the third timestamp indicates the time when the first time processing unit of the first device sends the second packet, and the modified domain of the second packet carries a third dwell time, where the third dwell time indicates a dwell time between the first time processing unit and the first service processing unit of the first device;

Determining that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time, and writing the fourth dwell time to the second a correction field of the message, obtaining the second time according to the third dwell time and the fourth dwell time;

And identifying, by the second timestamp, a fourth timestamp, where the fourth timestamp indicates a time when the second time processing unit receives the second message;

Generating a third packet, and sending the third packet to the first device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the second time.
The method of claim 8, wherein the determining the first message is between a second time processing unit of the second device and a second service processing unit of the second device The dwell time is the first dwell time and includes:

Determining, that the time when the first packet is sent out by the second time processing unit is fifth time information;

The time at the frame header of the sampling overhead frame is a seventh value, and the frame number at the frame header of the sampling the overhead frame is an eighth value, and the frame number of the overhead frame in which the first byte of the first packet is located is determined. a ninth value, determining, according to the seventh value, the eighth value, and the ninth value, that the time when the first packet is sent out to the second service processing unit is the sixth time information;

Determining, according to the fifth time information and the sixth time information, a dwell time of the first packet between the second time processing unit and the second service processing unit as a first dwell time .
The method according to claim 9, wherein said determining a dwell time of said second message from said second service processing unit to said second time processing unit is a fourth dwell time, including :

Determining, that the time when the second packet is transmitted to the second service processing unit is seventh time information;

Determining that the time when the second packet is transmitted to the second time processing unit is eighth time information;

Determining, according to the seventh time information and the eighth time information, that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time .
The method of claim 8, wherein the sending the first message to the first device comprises:

Inserting, in byte order, all bytes of the first packet into a configuration reserved bit of at least one overhead frame, and transmitting the at least one overhead frame to the first device, where each overhead frame is inserted into the One byte of the first message.
A time synchronization device, the device includes: a first service processing unit, a first time processing unit, and a configuration unit,

The first service processing unit is configured to acquire a first timestamp, where the first timestamp indicates a time when the second time processing unit of the second device sends the first message;

The first time processing unit is configured to determine a first time, where the first time indicates a dwell time between the second device and the first device, and is further configured to determine a second timestamp indicating a time when the first time processing unit of the first device receives the first message, and the third timestamp indicating the first time The time when the processing unit sends the second packet;

The first service processing unit is configured to acquire a fourth timestamp and a second time, where the fourth timestamp indicates a time when the second time processing unit receives the second message, and the second time indication a dwell time of the second message between the first device and the second device;

The configuration unit is configured to determine compensation according to the first timestamp, the second timestamp, the third timestamp, the fourth timestamp, the first time, and the second time Time; is further configured to configure the compensation time to the first device such that the time of the first device synchronizes the time of the second device.
The device of claim 13, wherein the first service processing unit comprises:

The first system time stamp processing module is configured to receive at least one overhead frame sent by the second device, and extract each byte of the first packet in the at least one overhead frame, where each byte is Combining to obtain the first packet, the first packet carries the first timestamp, the modified domain of the first packet carries a first camp time, and the first camp time indicates the a dwell time between the second time processing unit of the second device and the second service processing unit of the second device;

The first time processing unit is configured to determine that the dwell time of the first message from the first service processing unit of the first device to the first time processing unit is the second dwell time And configured to write the second dwell time into the correction domain of the second packet, and obtain the first time according to the first dwell time and the second dwell time.

The first time processing unit includes: a first time stamping module and a first message generating module,

The first time stamping module is configured to: when the first packet is sent to the first time processing unit, identify the second timestamp of the first packet;

The first packet generating module is configured to generate the second packet, and identify a third timestamp to the second packet.
The device according to claim 14, wherein the first service processing unit is configured to determine that the second message is between the first time processing unit and a first service processing unit of the first device The dwell time is a third dwell time; further configured to write the third dwell time to the correction domain of the second message to cause the second device to determine according to the third dwell time The second time is further configured to insert all bytes of the second packet into a configuration reserved bit of at least one overhead frame in a byte order, and send the at least one overhead frame to the second device, Each of the overhead frames is inserted into one byte of the second message.
The apparatus according to claim 15, wherein

The first service processing unit is configured to determine that the time when the first packet is sent to the first service processing unit is first time information;

The first time processing unit is configured to determine that the time when the first packet is transmitted to the first time processing unit is second time information, and is further configured to: according to the first time information and the second time Determining, by the information, that the camping time of the first packet from the first service processing unit to the first time processing unit is a second camp time;

The first time processing unit is configured to determine that the time when the second packet is sent out by the first time processing unit is third time information;

The first service processing unit is configured to determine that the time when the second packet is sent out of the first service processing unit is fourth time information, and is further configured to: according to the third time information and the And determining, by the fourth time information, a dwell time of the second packet between the first time processing unit and the first service processing unit as a third dwell time.
The device according to claim 15, wherein the first service processing unit comprises: a first system time stamp sampling module, a first system time stamp processing module,

The first system timestamp sampling module is configured to: when the first service processing unit detects a frame header of the overhead frame, sample the time at the frame header of the overhead frame as a first value, and sample the overhead frame The frame number at the frame header is a second value; and the frame number of the overhead frame in which the first byte of the first packet is sampled is a third value;

The first system time stamp sampling module is configured to determine first time information according to the first value, the second value, and the third value.
The device according to claim 16, wherein the first service processing unit comprises: a first system time stamp sampling module, a first system time stamp processing module,

The first system timestamp sampling module is configured to: the time at the frame header of the sampling overhead frame is a fourth value, and the frame number at the frame header of the sampling the overhead frame is a fifth value; and the second report is further configured to determine The frame number of the overhead frame in which the first byte of the text is located is the sixth value;

The first system time stamp processing module is configured to determine the fourth time information according to the fourth value, the fifth value, and the sixth value.
A time synchronization device, the device includes: a second time processing unit and a second service processing unit, where the second time processing unit includes: a second message generation module, and a second time stamping module,

The second packet generating module is configured to generate a first packet;

The second time stamping module is configured to identify a first timestamp for the first packet, where the first timestamp indicates that the second time processing unit of the second device sends the first packet time;

The second service processing unit is configured to determine that the first packet is in the second device The dwell time between the second time processing unit and the second service processing unit of the second device is a first dwell time, and the first dwell time is written into the correction domain of the second message; It is further configured to send the first message to the first device.
The apparatus according to claim 19, wherein

The second service processing unit is configured to receive at least one overhead frame sent by the first device, and extract each byte of the second packet in the at least one overhead frame, where each byte is Combining to obtain the second packet, where the second packet carries a third timestamp, where the third timestamp indicates a time when the first time processing unit of the first device sends the second packet, The modified domain of the second packet carries a third camp time, and the third camp time indicates that the second packet is in the first time processing unit and the first service processing unit of the first device Residence time between;

The second time processing unit is configured to determine that a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time, and is further configured to The fourth dwell time is written into the correction domain of the second packet, and is further configured to obtain the second time according to the third dwell time and the fourth dwell time;

The second time stamping module is configured to identify a fourth timestamp for the second message, where the fourth timestamp indicates a time when the second time processing unit receives the second message;

The second packet generating module is configured to generate a third packet;

The second service processing unit is configured to send the third packet to the first device, where the third packet carries the fourth timestamp, and the modified domain of the third packet carries the The second time.
The apparatus according to claim 20, wherein

The second time processing unit is configured to determine that the time when the first packet is sent out by the second time processing unit is fifth time information;

The second service processing unit is configured to count the time at the frame header of the overhead frame as the seventh number a value, the frame number at the frame header of the sampling of the overhead frame is an eighth value, and the frame number of the overhead frame in which the first byte of the first packet is located is determined to be a ninth value, according to the seventh value, Determining, by the eighth value and the ninth value, a time when the first packet is sent out by the second service processing unit is a sixth time information; and further configured to, according to the fifth time information, the Determining, by the six-time information, a dwell time of the first packet between the second time processing unit and the second service processing unit as a first dwell time;

The second service processing unit is configured to determine that the time when the second packet is transmitted to the second service processing unit is the seventh time information;

The second time processing unit is configured to determine that the time when the second packet is transmitted to the second time processing unit is eighth time information; and is further configured to: according to the seventh time information and the eighth time Determining, by the information, a dwell time of the second packet from the second service processing unit to the second time processing unit is a fourth dwell time;

The second service processing unit is configured to receive at least one overhead frame, and further configured to extract each byte of the second packet in the at least one overhead frame, and combine each of the bytes to obtain a Said the second message.
A computer storage medium having stored therein executable instructions for performing the time synchronization method of any one of claims 1 to 7.
A computer storage medium having stored therein executable instructions for performing the time synchronization method of any one of claims 8 to 12.