WO2017079920A1

WO2017079920A1 - Method and device for synchronization

Info

Publication number: WO2017079920A1
Application number: PCT/CN2015/094297
Authority: WO
Inventors: 蓝海青
Original assignee: 华为技术有限公司
Priority date: 2015-11-11
Filing date: 2015-11-11
Publication date: 2017-05-18
Also published as: CN108353368A

Abstract

Embodiments of the present invention provide a method for synchronization, comprising: a source device determines a reception-allowed moment when transmitting data, wherein the reception-allowed moment is obtained by adding a first transmission delay to the current moment; and the source device transmits a data packet to at least one target device, wherein the data packet comprises the reception-allowed moment and the data. In the embodiments of the present invention, the source device transmits the reception-allowed moment to the at least one target device while transmitting the data, so as to ensure that the at least one target device receives the data sent by the source device at the designated reception-allowed moment, such that transmitting/receiving synchronization between a source device and a target device can be implemented. Moreover, if there are a plurality of target devices, receiving synchronization among the plurality of target devices can also be ensured.

Description

Synchronization method and device

Technical field

Embodiments of the present invention relate to the field of communications, and, more particularly, to a method and apparatus for synchronization.

Background technique

In modern communication systems, there are a large number of scenarios. The source device sends out the data, and the target device needs to receive the data at a specified time, so that the data can be synchronously transmitted and received between the source device and the target device.

A typical application is the common common radio interface (CPRI) of In-phase Quadrature (IQ) data in the Radio Equipment Controller (REC) and radio equipment (Radio Equipment). The transmission between , RE) has the requirement of strict synchronization of the above transmission and reception. Another typical application is that the source device sends two identical data to two target devices, requiring two target devices to receive the two data at the same time.

The application of the synchronization system is very extensive, such as the requirement of the multi-channel multi-output (MIMO) of the wireless air interface technology. When the MIMO is in the single-stream operation mode, when multiple antennas simultaneously transmit the same data, the transmission data of the antenna port is required. Strict time synchronization.

However, in the prior art, the method of achieving synchronization is strongly related to the transmission system.

Summary of the invention

Embodiments of the present invention provide a method for synchronization that enables synchronization for any transmission system.

In a first aspect, a method of synchronization is provided, comprising:

When the source device sends data, determining the allowed receiving time, the allowed receiving time is the current time plus the first transmission delay;

The source device sends a data packet to at least one target device, the data packet including the allowed reception time and the data.

In the embodiment of the present invention, when the source device sends data, the receiving time is simultaneously transmitted to the at least one target device, so that at least one target device can ensure that the specified receiving device is allowed to receive. The data sent by the source device is received again, and can include synchronization between the source device and the target device. Moreover, if there are a plurality of target devices, reception synchronization between the plurality of target devices can also be ensured.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the source device receives the first transmission delay from a control center.

In conjunction with the first possible implementation of the first aspect, in a second possible implementation manner of the first aspect, the source device receives the at least one second transmission delay sent by the at least one target device; Transmitting at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

In conjunction with the first possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the source device calculates at least one second transmission delay corresponding to the at least one target device; The at least one second transmission delay is sent to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

In the embodiment of the present invention, the first transmission delay is determined by the control center and the first transmission delay is sent to the source device, so that the synchronization performance of the system can be ensured.

In a second aspect, a method of synchronizing is provided, comprising:

The target device receives at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable reception time and data;

The target device records the allowable reception time and caches the data;

The target device extracts the cached data at the time of allowing reception.

In the embodiment of the present invention, the target device receives the allowed receiving time set by the source device while receiving the data, so that the target device can receive data at the time of allowing the receiving, and can ensure synchronization with the source device.

With reference to the second aspect, in a first possible implementation manner of the second aspect, if the current time exceeds the allowed receiving time, the difference between the current time and the allowed receiving time is recorded; and the data packet is discarded. Transmitting the difference to a control center such that the control center updates the first transmission delay based on the difference.

In this way, if the target device cannot receive data at the time of allowing reception due to the excessive delay, the target device sends the difference between the current receiving time and the allowed receiving time to the control center, so that the control center can perform the first receiving delay. Make adjustments and updates to ensure synchronization performance.

In a third aspect, a method of synchronizing is provided, comprising:

The control center determines the first transmission delay;

The control center transmits the first transmission delay to at least one source device.

In the embodiment of the present invention, the control center determines the first transmission delay and sends the first transmission delay to the at least one source device, and can be used to determine the allowed reception time by the at least one source device to ensure the target receiving device and the source device. Synchronization between.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the control center receives the at least one second transmission delay that is sent by the at least one source device or the at least one target device; determining the first transmission delay includes: Determining the first transmission delay according to the at least one second transmission delay.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation of the third aspect, a maximum value of the at least one second transmission delay is used as the first transmission delay.

The control center uses the maximum value as the first transmission delay, and can determine synchronization between multiple source devices and multiple target devices.

With reference to the third aspect, in a third possible implementation manner of the third aspect, the control center is deployed in one of the at least one source device; or the control center is deployed in the at least one target device In a target device.

Deploying the control center in a source or target device can increase the system's compactness and save system cost.

It can be seen that the control center can obtain the delay information of the system, and determine the first transmission delay according to the delay information of the system, so as to ensure the total control function of the synchronization of the control center to the system, thereby ensuring the synchronization performance of the system.

A fourth aspect provides a device for synchronization, where the device is a source device, including:

a determining unit, configured to determine, when the data is sent, an allowed receiving time, where the allowed receiving time is a current time plus a first transmission delay;

And a sending unit, configured to send a data packet to the at least one target device, where the data packet includes the allowed receiving moment and the data.

The device for synchronizing is used to implement the method described in the first aspect or any of the implementations described above.

A fifth aspect provides a device for synchronization, where the device is a target device, including:

a receiving unit, configured to receive at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable receiving time and data;

a processing unit, configured to record the allowed receiving moment and cache the data;

The processing unit is further configured to extract the cached data at the time of allowing reception.

The device for synchronizing is used to implement the method described in the second aspect or any of the implementations described above.

A sixth aspect provides a device for synchronization, where the device is a control center, including:

a determining unit, configured to determine a first transmission delay;

And a sending unit, configured to send the first transmission delay to the at least one source device.

The device for synchronizing is used to implement the method described in the third aspect or any of the implementations described above.

A seventh aspect provides a device for synchronization, where the device is a source device, including:

a processor, configured to determine a time limit for allowing reception when transmitting data, where the allowed receiving time is a current time plus a first transmission delay;

And a transmitter, configured to send a data packet to the at least one target device, where the data packet includes the allowed reception time and the data.

In an eighth aspect, a device for synchronization is provided, where the device is a target device, including:

a receiver, configured to receive at least one data packet sent by at least one source device, where each of the at least one data packet includes an allowable receiving time and data;

a processor, configured to record the allowed reception time and cache the data;

The processor is further configured to extract the cached data at the time of allowing reception.

A ninth aspect provides a device for synchronization, where the device is a control center, including:

a processor, configured to determine a first transmission delay;

And a transmitter, configured to send the first transmission delay to at least one source device.

In a tenth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program that causes the source device to perform the first aspect described above, and any of its various implementations are synchronized method.

In an eleventh aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program causing a target device to perform the second aspect described above, and synchronizing any of the various implementations thereof Methods.

In a twelfth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program causing a control center to perform the third aspect described above, and synchronizing any of the various implementations thereof Methods.

Optionally, in the embodiment of the present invention, the transmission network between the source device and the target device is a TDM network, and the allowed reception time is carried in the TDM frame structure.

Optionally, in the embodiment of the present invention, the transmission network between the source device and the target device is a packet network, and the allowed reception time is carried in the packet frame structure.

In the embodiment of the present invention, when the source device sends data, the receiving time is simultaneously sent to the at least one target device, so that the at least one target device can receive the data sent by the source device at the specified allowed receiving time, which can include Synchronization between the source device and the target device. Moreover, if there are a plurality of target devices, reception synchronization between the plurality of target devices can also be ensured.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a flow chart of a method of synchronization in accordance with one embodiment of the present invention.

2 is a schematic diagram of a data packet sent by a source device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a scenario of an embodiment of the present invention.

4 is a flow chart of a method of synchronization in accordance with another embodiment of the present invention.

Figure 5 is a flow diagram of a method of synchronization in accordance with another embodiment of the present invention.

6 is a flow diagram of a process of synchronization in accordance with an embodiment of the present invention.

FIG. 7 is a schematic diagram of a scenario of another embodiment of the present invention.

8 is a flow diagram of a process of synchronization in accordance with another embodiment of the present invention.

Figure 9 is a block diagram of an apparatus for synchronization in accordance with one embodiment of the present invention.

Figure 10 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention.

Figure 11 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention.

Figure 12 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention.

Figure 13 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention.

Figure 14 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that, in the embodiment of the present invention, the source device, the target device, and the control center may be any device that has a function of sending and receiving, for example, may be any one of the following: a base station, a user equipment (User Equipment, UE), and a forwarding device. Equipment, controllers, etc. The invention is not limited thereto.

1 is a method of synchronization in accordance with one embodiment of the present invention. The method shown in Figure 1 includes:

S101. The source device determines, when the data is sent, the allowed receiving time, where the allowed receiving time is the current time plus the first transmission delay.

S102. The source device sends a data packet to at least one target device, where the data packet includes the allowed receiving moment and the data.

Here, the allowed time (LT) is the reception time specified by the source device for the target device. For example, as shown in FIG. 2, an example of data transmitted by a source device. With respect to FIG. 2(1), in S101, when the source device transmits DATA1, it determines that the allowable reception time is LT1, where LT1=the current time of transmitting DATA1+the first transmission delay. Further, in S102, the source device transmits the data packet as shown in FIG. 2(1). For FIG. 2(2), the source device determines the allowable reception times of DATA1, DATA2, and DATA3 as LT1, LT2, and LT3, respectively. Further, the source device transmits the data packet as shown in FIG. 2 (2).

That is to say, when the source device has data to transmit, it first determines the allowable reception time based on the current time of data transmission, and transmits the determined allowed reception time along with the data.

The allowable reception time can be carried in a specific field of the data packet.

In the embodiment of the present invention, the source device may send data to the at least one target device through the transmission system, where the transmission system may also be referred to as a transmission network. As shown in FIG. 3, M source devices (source device 111 to source device M 12), N target devices (target device 121 to target device N 22), transmission system 10, and control center 30 are further included. Where M and N are positive integers.

That is, in the embodiment of the present invention, one or more source devices may be included, and one or more target devices may be included.

Optionally, if the transmission network between the source device and the at least one target device is a Time Division Multiplexing (TDM) network, the allowed reception time may be carried in the TDM frame structure. For example, the TDM network can be an E1TDM or a Synchronous Digital Hierarchy (SDH).

Optionally, if the transmission network between the source device and the at least one target device is a packet network, the allowed reception time may be carried in the packet frame structure. For example, the packet network can be an Internet Protocol (IP) network or an Ethernet network.

Optionally, if the transmission network between the source device and the at least one target device is a fiber direct transmission network, the allowed reception time may be carried in a corresponding frame structure. For example, the optical fiber direct transmission network may be a Wavelength Division Multiplexing (WDM) network.

It can be seen that the synchronization method of the embodiment of the present invention is independent of the transmission system. In the process of S102, it is only necessary to carry the information of the allowed reception time in the corresponding field.

It can be understood that the synchronization method in the embodiment of the present invention can be applied to a wired network or a wireless network, and can be applied to any layer of a transmission protocol (such as an IP layer and a MAC layer), and can be applied to MIMO of a mobile network such as 4G and 5G. Such a wide range of applications, breaking through technical barriers.

In this way, after receiving the data packet, the target device may first cache the data packet and register the allowed reception time included in the data packet. Data is then extracted from the cache at the time of the allowed reception.

In the embodiment of the present invention, the first transmission delay may also be referred to as an available transmission delay, which refers to how much transmission delay the source device transmits to the target device. Here, the first transmission delay may be pre-stored in the source device.

Alternatively, the first transmission delay may be received by the source device from the control center. Then, it can be understood that, before S101, the method further includes: receiving, by the control center, the first transmission delay.

The source device may receive the first transmission delay from the control center periodically or periodically. In this way, changes in the transmission system can be dynamically tracked. It can be understood that the source device receives the new first transmission time delay and replaces the previously received old first transmission delay.

Optionally, as an embodiment, before receiving the first transmission delay from the control center, the source device may calculate at least one second transmission delay corresponding to the at least one target device, and the at least one The second transmission delay is sent to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

The control center may determine the maximum value of the at least one second transmission delay as the first transmission delay. Alternatively, if the control center receives at least one second transmission delay sent by each of the at least one source device, the control center may use the maximum value of all the received second transmission delays as the first Transmission delay.

The at least one second transmission delay may be in one-to-one correspondence with the at least one target device. The source device calculates the at least one second transmission delay corresponding to the at least one target device, and may include: the source device calculates a second transmission delay corresponding to each target device.

For example, for the first target device in the at least one target device, the source device calculating the second transmission delay corresponding to the first target device may include: determining, by the measurement, the second transmission delay corresponding to the first target device . For example, the source device may record that the time when the data packet P1 is sent is t1, and the time when the first target device receives the data packet P1 (the time when the first target device feeds back the received information to the source device) is t2, then the source device may calculate The transmission delay of the first target device is t2-t1.

For another example, for the first target device in the at least one target device, the calculating, by the source device, the second transmission delay corresponding to the first target device may include: counting all transmissions with the first target device within the preset time period. The delay, the maximum value of all the transmission delays is used as the second transmission delay corresponding to the first target device. Here, the preset time period is the latest time period of the source device at the current time of the statistics. For example, if the current time counted by the source device is t0 and the preset time period is T1, the source device can count the time from t0-T1. All transmission delays in the time period up to time t0.

The sending, by the source device, the at least one second transmission delay to the control center may include: the source device directly sending the at least one second transmission delay to the control center; or the method may include: the source device transmitting the at least one second transmission The extension is sent indirectly to the control center. For example, the source device may send the at least one second transmission delay to the second target device of the at least one target device, so that the second target device forwards the at least one second transmission delay to the control center.

Optionally, the source device may calculate the at least one second transmission delay and send the at least one second transmission delay to the control center periodically or periodically.

Optionally, as an embodiment, before receiving the first transmission delay from the control center, the source device may receive the at least one second transmission delay sent by the at least one target device; and the at least one second The transmission delay is sent to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

The at least one second transmission delay is one-to-one corresponding to the at least one target device, and may be respectively calculated by the corresponding target device.

Thus, by the method shown in FIG. 1, synchronization between the source device and at least one target device, at least one target device, can be achieved.

4 is a method of synchronization of another embodiment of the present invention. The method shown in Figure 4 includes:

S401. The target device receives at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable reception time and data.

S402. The target device records the allowed reception time and caches the data.

S403. The target device extracts the cached data at the time of allowing reception.

Optionally, if the transmission network between the source device and the target device is a Time Division Multiplexing (TDM) network, the allowed reception time may be carried in the TDM frame structure. For example, the TDM network can be an E1TDM or a Synchronous Digital Hierarchy (SDH).

Optionally, if the transmission network between the source device and the target device is a packet network, the allowed reception time may be carried in the packet frame structure. For example, the packet network can be an Internet Protocol (IP) network or an Ethernet network.

Optionally, if the transmission network between the source device and the target device is a fiber direct transmission network, the allowed reception time may be carried in a corresponding frame structure. For example, the optical fiber direct transmission network may be a Wavelength Division Multiplexing (WDM) network.

It can be seen that the synchronization method of the embodiment of the present invention is independent of the transmission system. In the process of S401, the information of the allowed time of reception is only required to be carried in the corresponding field.

In the embodiment of the present invention, the allowed receiving time is determined by at least one source device. The at least one source device may determine the allowable reception time based on the first transmission delay received from the control center.

Optionally, before S401, the method further includes: calculating at least one second transmission delay between the at least one source device; and sending the at least one second transmission delay to the control center, so that the control The center determines the first transmission delay according to the at least one second transmission delay.

The target device may count all transmission delays between the preset source and the first source device in the at least one source device; and use the maximum value of all the transmission delays as the first The second transmission delay corresponding to the source device.

The control center may determine the maximum value of the at least one second transmission delay as the first transmission delay. Alternatively, if the control center receives at least one second transmission delay sent by each of the at least one target device, the control center may use the maximum value of all the received second transmission delays as the first Transmission delay.

The at least one second transmission delay may be in one-to-one correspondence with the at least one source device. The calculating, by the target device, the at least one second transmission delay corresponding to the at least one source device may include: the target device calculating a second transmission delay corresponding to each source device.

For example, for the first source device of the at least one source device, the target device calculating the second transmission delay corresponding to the first source device may include: determining, by the measurement device, the second transmission delay corresponding to the first source device . For example, the first source device may carry the time when the sending of the data packet P1 is t1, and the time when the target device records the received data packet P1 is t2, then the target device may calculate the transmission time of the first source device. The delay is t2-t1.

For another example, for the first source device of the at least one source device, calculating, by the target device, the second transmission delay corresponding to the first source device may include: counting all transmissions with the first source device within the preset time period. The delay, the maximum value of all the transmission delays is used as the second transmission delay corresponding to the first source device. Here, the preset time period is the latest time period of the current time of the target device at the statistics. For example, if the current time counted by the target device is t0 and the preset time period is T1, the target device can count the time from t0-T1. All transmission delays in the time period up to time t0.

The sending, by the target device, the at least one second transmission delay to the control center may include: the target device directly sending the at least one second transmission delay to the control center; or the method may include: the at least one second transmission time of the target device The extension is sent indirectly to the control center. For example, the target device may send the at least one second transmission delay to the second source device of the at least one source device, so that the second source device forwards the at least one second transmission delay to the control center.

Optionally, the target device may calculate the at least one second transmission delay and send the at least one second transmission delay to the control center periodically or periodically. In this way, changes in the transmission system can be dynamically tracked.

It can be understood that, if the control center receives at least one second transmission delay sent by each target device of the multiple target devices, for example, the control center receives N second transmissions sent by each target device of the M target devices. Then, the control center determines the maximum value of the M×N second transmission delays as the first transmission delay.

Optionally, as an embodiment, before S401, the target device may receive the at least one second transmission delay sent by the at least one source device, and send the at least one second transmission delay to the control center. The control center determines the first transmission delay according to the at least one second transmission delay.

The at least one second transmission delay is one-to-one corresponding to the at least one source device, and may be respectively calculated by the corresponding source device.

It can be understood that if the target device is t3 at the current time of executing S401, the allowable reception time is t4, and t4 is after t3, that is, t4>t3, the target device performs S402 and S403.

In another case, if t4 is before t3, that is, t4 < t3, or t4 has exceeded t3, the target device may discard the packet received at S401. That is, if the current time at which the target device performs S401 exceeds the allowable reception time, the data packet is discarded.

As another embodiment, in another case, if t4 is located before t3, that is, t4<t3, or t4 has exceeded t3, the target device may record the difference between the current time and the allowed reception time. The value is sent to the control center such that the control center updates the first transmission delay based on the difference. Then discard the packet. That is, if the current time at which the target device performs S401 exceeds the allowable reception time, the difference between the current time and the allowed reception time is recorded; the data packet is discarded; and the difference is sent to the control center. So that the control center updates the first transmission delay according to the difference. After the difference is recorded, the data packet may be discarded and then sent to the control center; or, after the difference is recorded, the difference may be sent to the control center before the data packet is discarded. The invention is not limited thereto.

In this way, synchronization between the target device and the at least one source device, the at least one source device, can be achieved by the method shown in FIG.

Figure 5 is a diagram of a method of synchronization in accordance with another embodiment of the present invention. The method shown in Figure 5 includes:

S501. The control center determines a first transmission delay.

S502. The control center sends the first transmission delay to at least one source device.

It should be noted that, in the embodiment of the present invention, the control center may be a separate device, or the control center may be deployed in one source device of the at least one source device, or the control center may also be deployed in at least one target device. In a target device. For example, the control center can be a module of a source device. Alternatively, the control center can be a module of a target device.

Specifically, in S501, the control center may determine the first transmission delay according to the at least one second transmission delay. For example, the control center may use the maximum value of the at least one second transmission delay as the first transmission delay. Then, before S501, the method further includes: the control center receiving the at least one second transmission delay sent by the at least one source device or the at least one target device.

For example, suppose there are M source devices and N target devices. Where M and N are both positive integers. Then, the control center can receive M×N second transmission delays, and determine the first transmission delay according to M×N second transmission delays.

As an example, each source device may determine N second transmission delays, and the control center may receive N second transmission delays, N second transmission delays, and Ns sent by each of the M source devices. One target device corresponds to one.

As another example, each target device may determine M second transmission delays, and the control center may receive M second transmission delays sent by each of the N target devices, and M second transmission delays. M source devices correspond one by one.

As another example, each source device may determine N second transmission delays and send the determined second transmission delay to the first target device, and the control center may receive the M×N seconds forwarded by the first target device. Transmission delay.

As another example, the M source devices may send the respective determined N second transmission delays to different target devices, and the control center may receive M×N second transmission delays forwarded by different target devices.

As another example, each target device may determine M second transmission delays and send the determined second transmission delay to the first source device, where the control center may receive the M×N seconds forwarded by the first source device. Transmission delay.

As another example, the N target devices may send the respective determined M second transmission delays. To different source devices, the control center can receive M×N second transmission delays forwarded by different source devices.

Then, it can be understood that the control center can receive M×N second transmission delays sent by the M source devices; or the control center can receive M×N seconds sent by one or more of the M source devices. Transmission delay. The control center may receive M×N second transmission delays sent by the N target devices; or the control center may receive M×N second transmission delays sent by one or more of the N target devices. The invention is not limited thereto.

Alternatively, the control center may receive M×N second transmission delays periodically or periodically and perform the method illustrated in FIG. 5.

Optionally, the method shown in FIG. 5 may further include: receiving a difference sent by the first target device in the at least one target device; and updating the first transmission delay according to the difference.

For example, the sum of the difference and the first transmission delay may be determined as the updated first transmission delay.

The method for synchronizing the embodiment of the present invention is described in detail below by taking M=1, N=2 as an example. As shown in FIG. 6, the control center 30, the source device 11, the target device 21, and the target device 22 are included. The method shown in Figure 6 includes:

S601, the target device 21 and the target device 22 send a second transmission delay to the control center 30.

Specifically, the target device 21 calculates the second transmission delay T11 between it and the source device 11, and transmits the second transmission delay T11 to the control center 30.

Specifically, the target device 22 calculates the second transmission delay T12 between it and the source device 11, and transmits the second transmission delay T12 to the control center 30.

Optionally, the target device 21 may send the second transmission delay T11 to the source device 11, and then the source device 11 forwards the second transmission delay T11 to the control center 30; and/or, the target device 22 may be the second The transmission delay T12 is sent to the source device 11, and the second transmission delay T12 is forwarded by the source device 11 to the control center 30.

For the process of calculating the second transmission delay of the target device 21 and the target device 22, refer to the related description of the foregoing embodiment of FIG. 4. To avoid repetition, details are not described herein again.

It should be noted that, in the embodiment of the present invention, the step of S601 may also be implemented by other methods instead. For example, the source device 11 may calculate the second transmission delay T11 with the target device 21 and the second transmission delay T12 with the target device 22, respectively, and send the second transmission delay T11 and the second transmission delay T12 to Control center 30. For another example, it may be that the source device 11 calculates and targets respectively. a second transmission delay T11 of the backup 21 and a second transmission delay T12 with the target device 22, and transmitting the second transmission delay T11 and the second transmission delay T12 to the target device 21 or the target device 22, and then Target device 21 or target device 22 forwards to control center 30.

For the process of calculating the second transmission delay of the source device 11, reference may be made to the related description of the foregoing embodiment of FIG. 1. To avoid repetition, details are not described herein again.

S602. The control center determines a first transmission delay.

Specifically, the control center determines the first transmission delay according to all the second transmission delays received at S601, for example, determining the maximum value of all the second transmission delays as the first transmission delay.

In this embodiment, it is assumed that the first transmission delay is represented as T21. Then, if T11>T12, then T21=T11; if T11<T12, then T21=T12.

Here, the first transmission delay may also be referred to as an available transmission delay. It can be understood that, in the embodiment of the present invention, the control center is mainly used to generate an available transmission delay.

S603. The control center sends the first transmission delay T21 to the source device 11.

The source device 11 receives and saves the first transmission delay T21. It can be understood that, if the first transmission delay is stored in the source device 11 and before the S603, the source device 11 replaces the previously stored first transmission delay with the first transmission received in S603 after S603. The delay is T21.

S604. When transmitting the data, the source device 11 determines the allowable reception time t11.

For example, assuming that the current time of the source device 11 when data (DATA) is to be transmitted is t0, the source device 11 can determine the allowable reception time t11=t0+T21. That is to say, the receiving time is allowed to add the first transmission delay to the current time.

For the S604 in this embodiment, refer to the description of S101 in the foregoing embodiment of FIG. 1. To avoid repetition, details are not described herein again.

S605, the source device 11 sends the data packet to the target device 21 and the target device 22, wherein the data packet includes an admission time and data.

For example, as shown in FIG. 7, the source device 11 may transmit the data packet in which the data (DATA) is allowed to be received at the time t11.

For the S605 in this embodiment, refer to the description of S102 in the foregoing embodiment of FIG. 1. To avoid repetition, details are not described herein again.

At S606, the target device 21 and the target device 22 record the allowable reception time t11 in the data packet and buffer the data.

For example, if the target device 21 receives the data packet at time t21 and is at the target device 21 The clock has not passed the allowable reception time t11, and the target device 21 records the allowable reception time t11 in the data packet and buffers the data. If the target device 22 receives the data packet at time t22, and the clock at the target device 22 has not passed the allowable reception time t11, the target device 22 records the allowable reception time t11 in the data packet and buffers the data. It should be noted that the time at which the target device 21 and the target device 22 receive the data packet may be the same or different, that is, t21=t22 or t21≠t22, which is not limited by the present invention.

For the S606 in this embodiment, refer to the description of S402 in the foregoing embodiment of FIG. 4. To avoid repetition, details are not described herein again.

At S607, the target device 21 and the target device 22 extract data from the cache at the time of receiving reception t11.

Specifically, when the clocks of the target device 21 and the target device 22 reach t11, data is read from the cache, which enables synchronization of the source device 11, the target device 21, and the target device 22.

For the S607 in this embodiment, refer to the description of S403 in the foregoing embodiment of FIG. 4. To avoid repetition, details are not described herein again.

On the other hand, in the embodiment of the present invention, the target device 21 and/or the target device 22 may be provided with a fault tolerance scheme. For example, if the time t21 at which the target device 21 receives the data packet has exceeded the allowable reception time t11, the target device 21 may discard the data packet.

Alternatively, as shown in FIG. 8, taking the target device 21 as an example, S608 may be performed after S605.

S608, if the time t21 at which the target device 21 receives the data packet has exceeded the allowable reception time t11, the target device 21 can calculate the difference between t21 and t11.

It can be understood that the difference is t21-t11.

S609, the target device 21 discards the data packet.

S610, the target device 21 sends the difference to the control center 30.

The S610 may be executed before or after S609, or S610 may be executed simultaneously with S609.

S611. The control center 30 updates the first transmission delay according to the difference.

Specifically, the control center 30 determines the sum of the first transmission time T21 and the difference t21-t11, T21+t21-t11, as the updated first transmission delay.

S612. The control center 30 transmits the updated first transmission delay T21+t21-t11 to the source device 11.

In S613, the source device 11 replaces the originally stored first transmission delay T21 with the updated first transmission delay T21+t21-t11.

In this way, the control center 30 can update the first transmission delay in time, thereby ensuring synchronization between the respective source devices and the target device.

It can be understood that, for the target device 22, if the time t22 at which the target device 22 receives the data packet has exceeded the allowable reception time t11, the target device 22 can discard the data packet. Alternatively, a process similar to that of FIG. 8 is performed, and to avoid repetition, details are not described herein again.

It should be noted that the method of synchronization in the embodiment of the present invention can also be applied to synchronization between a plurality of target devices having a cascade relationship. For example, the source device will include a data packet that allows the reception time and data to be sent to the first target device, and the first target device then copies the data packet and sends it to the second target device. In this way, both the first target device and the second target device read the data at the time of allowing reception, thereby enabling synchronization of the first target device and the second target device having the cascade relationship with the source device.

It can be understood that the method of synchronization in the embodiment of the present invention can also be applied to a networking system. The networking system includes a plurality of domains, each of which can perform the method of synchronization described in the foregoing embodiments. For example, the control center may determine that the first transmission delay of the first domain is T21, the first transmission delay of the second domain is determined to be T22, and so on. In this way, synchronization within the respective domains can be achieved.

In this way, in the method provided by the embodiment of the present invention, the transmission and reception of the data is accompanied by the allowable reception time determined by the source device, and the transmission and reception of the source device and the target device can be ensured. And it can reduce the synchronization requirements of the transmission network, thereby reducing the cost of transmission.

Moreover, the synchronization method provided by the embodiment of the present invention can reduce the clock synchronization cost of the target device. Since the target devices are generally deployed in a large amount, the cost reduction of the target device brings great economic benefits.

Figure 9 is a block diagram of an apparatus for synchronization in accordance with one embodiment of the present invention. The device shown in FIG. 9 is a source device 900, and includes a determining unit 901 and a transmitting unit 902.

The determining unit 901 is configured to determine, when the data is sent, the allowed receiving time, where the allowed receiving time is the current time plus the first transmission delay.

The sending unit 902 is configured to send a data packet to the at least one target device, where the data packet includes the allowed receiving moment and the data.

Optionally, as an embodiment, the source device 900 may further include a receiving unit, configured to receive the first transmission delay from the control center.

Optionally, in another embodiment, the receiving unit is further configured to receive the at least one second transmission delay sent by the at least one target device. The determining unit 901 is further configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

Optionally, as another embodiment, the determining unit 901 is further configured to calculate at least one second transmission delay corresponding to the at least one target device. The sending unit 902 is further configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

Optionally, as another embodiment, the determining unit 901 is specifically configured to: calculate, in a preset time period, all transmission delays with the first target device in the at least one target device; The maximum value in the delay is used as the second transmission delay corresponding to the first target device.

Optionally, as another embodiment, the sending unit 902 is specifically configured to: send the at least one second transmission delay to a second target device in the at least one target device, so that the second target device Forwarding the at least one second transmission delay to the control center.

It should be noted that, in the embodiment of the present invention, the transmission network between the source device and the at least one target device is a TDM network, and the allowed reception time is carried in the TDM frame structure. Alternatively, the transmission network between the source device and the at least one target device is a packet network, and the allowed reception moment is carried in a packet frame structure. Alternatively, the transmission network may be of other types, which is not limited herein.

It should be noted that, in the embodiment of the present invention, the sending unit 902 may be implemented by a transmitter, the determining unit 901 may be implemented by a processor, and the receiving unit may be implemented by a receiver. As shown in FIG. 10, the source device 1000 may include a processor 1001, a receiver 1002, a transmitter 1003, and a memory 1004. The memory 1004 can be used to store the first transmission delay described above, and can also be used to store codes and the like executed by the processor 1001.

The various components in source device 1000 are coupled together by a bus system 1005, which in addition to the data bus includes a power bus, a control bus, and a status signal bus.

The source device 900 shown in FIG. 9 or the source device 1000 shown in FIG. 10 can implement various processes implemented by the source device in the foregoing method embodiments. To avoid repetition, details are not described herein again.

Figure 11 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention. The design shown in Figure 11 The target device 1100 includes a receiving unit 1101 and a processing unit 1102.

The receiving unit 1101 is configured to receive at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable receiving time and data.

The processing unit 1102 is configured to record the allowed receiving moment and cache the data, and is further configured to extract the cached data at the allowed receiving moment.

Optionally, if the transmission network between the source device and the target device is a TDM network, the allowed reception time may be carried in the TDM frame structure. Optionally, if the transmission network between the source device and the target device is a packet network, the allowed reception time may be carried in the packet frame structure. Optionally, if the transmission network between the source device and the target device is a fiber direct transmission network, the allowed reception time may be carried in a corresponding frame structure. It should be noted that the transmission network may also be of other types, which is not limited herein.

Optionally, as an embodiment, the processing unit 1102 is further configured to: if the current time exceeds the allowed receiving moment, discard the data packet.

Optionally, as another embodiment, the target device 1100 may further include a sending unit. The processing unit 1102 is further configured to: if the current time exceeds the allowed receiving time, record a difference between the current time and the allowed receiving time; and discard the data packet. The sending unit is configured to send the difference to the control center, so that the control center updates the first transmission delay according to the difference.

Optionally, as another embodiment, the receiving unit 1101 is further configured to receive the at least one second transmission delay sent by the at least one source device. The sending unit is configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

Optionally, as another embodiment, the processing unit 1102 is further configured to calculate at least one second transmission delay between the at least one source device. The sending unit is configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.

Optionally, as another embodiment, the processing unit 1102 is specifically configured to: calculate, in a preset time period, all transmission delays between the first source device and the first source device in the at least one source device; The maximum value of all transmission delays is used as the second transmission delay corresponding to the first source device.

It should be noted that, in the embodiment of the present invention, the receiving unit 1101 may be implemented by a receiver, the processing unit 1102 may be implemented by a processor, and the sending unit may be implemented by a transmitter. As shown in FIG. 12, the target device 1200 can include a processor 1201, a receiver 1202, a transmitter 1203, and a memory 1204. The memory 1204 can be used to store the above-mentioned allowable receiving time, and can also be used to store code and the like executed by the processor 1201.

The various components in target device 1200 are coupled together by a bus system 1205, which in addition to the data bus includes a power bus, a control bus, and a status signal bus.

The target device 1100 shown in FIG. 11 or the target device 1200 shown in FIG. 12 can implement various processes implemented by the target device in the foregoing method embodiments. To avoid repetition, details are not described herein again.

Figure 13 is a block diagram of an apparatus for synchronization in accordance with another embodiment of the present invention. The device shown in FIG. 13 is a control center 1300, and includes a determining unit 1301 and a transmitting unit 1302.

The determining unit 1301 is configured to determine the first transmission delay.

The sending unit 1302 is configured to send the first transmission delay to at least one source device.

That is, the control center 1300 can be deployed in one of the at least one source device. Alternatively, the control center 1300 can be deployed in one of the at least one target device.

Optionally, as an embodiment, the control center 1300 may further include a receiving unit, configured to receive the at least one second transmission delay sent by the at least one source device or the at least one target device. The determining unit 1301 is specifically configured to determine the first transmission delay according to the at least one second transmission delay.

Optionally, as another embodiment, the determining unit 1301 is specifically configured to use a maximum value of the at least one second transmission delay as the first transmission delay.

Optionally, as another embodiment, the receiving unit is configured to receive a difference sent by the first target device in the at least one target device. The determining unit 1301 is further configured to update the first transmission delay according to the difference. Specifically, the determining unit 1301 may determine the sum of the difference value and the first transmission delay as the updated first transmission delay.

It should be noted that, in the embodiment of the present invention, the determining unit 1301 may be implemented by a processor, the sending unit 1302 may be implemented by a transmitter, and the receiving unit may be implemented by a receiver. As shown in FIG. 14, the control center 1400 can include a processor 1401, a receiver 1402, a transmitter 1403, and a memory 1404. The memory 1404 can be used to store the first transmission delay described above, and can also be used to store codes and the like executed by the processor 1401.

The various components in control center 1400 are coupled together by a bus system 1405 that includes, in addition to the data bus, a power bus, a control bus, and a status signal bus.

The control center 1300 shown in FIG. 13 or the control center 1400 shown in FIG. 14 can implement various processes implemented by the control center in the foregoing method embodiments. To avoid repetition, details are not described herein again.

It should be noted that the above described method embodiments of the present invention may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It is to be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM) or a programmable read-only memory (Programmable). ROM, PROM), Erasable PROM (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM) or Flash Memory. The volatile memory can be a Random Access Memory (RAM) that acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM). SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Synchronous Connection Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A method of synchronization, comprising:

When the source device sends data, determining the allowed receiving time, the allowed receiving time is the current time plus the first transmission delay;

The source device sends a data packet to at least one target device, the data packet including the allowed reception time and the data.
The method according to claim 1, wherein before the determining the time for allowing reception, the method further comprises:

The first transmission delay is received from a control center.
The method according to claim 2, further comprising: before receiving the first transmission delay from the control center, further comprising:

Receiving at least one second transmission delay sent by the at least one target device;

And transmitting the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The method according to claim 2, further comprising: before receiving the first transmission delay from the control center, further comprising:

Calculating at least one second transmission delay corresponding to the at least one target device;

And transmitting the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The method according to claim 4, wherein the calculating the at least one second transmission delay corresponding to the at least one target device comprises:

Counting all transmission delays between the preset target time period and the first target device in the at least one target device;

The maximum value of all the transmission delays is used as the second transmission delay corresponding to the first target device.
The method according to claim 4 or 5, wherein the sending the at least one second transmission delay to the control center comprises:

Transmitting the at least one second transmission delay to a second target device of the at least one target device, such that the second target device forwards the at least one second transmission delay to the control center.
Method according to any of claims 1 to 6, wherein said source device The transmission network with the at least one target device is a time division multiplexed TDM network, and the allowed reception time is carried in the TDM frame structure.
The method according to any one of claims 1 to 6, wherein the transmission network between the source device and the at least one target device is a packet network, and the allowed reception time is carried in a packet frame structure.
A method of synchronization, comprising:

The target device receives at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable reception time and data;

The target device records the allowable reception time and caches the data;

The target device extracts the cached data at the time of allowing reception.
The method of claim 9 further comprising:

If the current time exceeds the allowed reception time, the data packet is discarded.
The method of claim 9 further comprising:

Recording, when the current time exceeds the allowed receiving time, a difference between the current time and the allowed receiving time;

Discard the data packet;

The difference is sent to a control center such that the control center updates the first transmission delay based on the difference.
The method according to any one of claims 9 to 11, further comprising: before the target device receives the at least one data packet sent by the at least one source device, further comprising:

Receiving at least one second transmission delay sent by the at least one source device;

And transmitting the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The method according to any one of claims 9 to 11, further comprising: before the target device receives the at least one data packet sent by the at least one source device, further comprising:

Computing at least one second transmission delay between the at least one source device;

And transmitting the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The method according to claim 13, wherein the calculating the at least one second transmission delay between the at least one source device comprises:

Counting between the preset source period and the first source device of the at least one source device Have a transmission delay;

The maximum value of all the transmission delays is used as the second transmission delay corresponding to the first source device.
The method according to any one of claims 9 to 14, wherein the transmission network between the target device and the at least one source device is a time division multiplexed TDM network, and the allowed reception time is carried in a TDM frame. In the structure.
The method according to any one of claims 9 to 14, wherein the transmission network between the target device and the at least one source device is a packet network, and the allowed reception time is carried in a packet frame structure.
A method of synchronization, comprising:

The control center determines the first transmission delay;

The control center transmits the first transmission delay to at least one source device.
The method of claim 17 wherein:

Before the determining the first transmission delay, the method further includes: receiving at least one second transmission delay sent by the at least one source device or the at least one target device;

The determining the first transmission delay includes: determining the first transmission delay according to the at least one second transmission delay.
The method according to claim 18, wherein the determining the first transmission delay according to the at least one second transmission delay comprises:

The maximum value of the at least one second transmission delay is used as the first transmission delay.
The method according to any one of claims 17 to 19, further comprising:

Receiving a difference sent by the first target device in the at least one target device;

Updating the first transmission delay according to the difference.
The method of claim 20, wherein updating the first transmission delay according to the difference comprises:

And determining a sum of the difference and the first transmission delay as the updated first transmission delay.
The method according to any one of claims 17 to 21, wherein the control center is deployed in one of the at least one source device.
The method according to any one of claims 17 to 21, wherein the control center is deployed in one of the at least one target device.
A device for synchronizing, wherein the device is a source device, including:

a determining unit, configured to determine, when the data is sent, an allowed receiving time, where the allowed receiving time is a current time plus a first transmission delay;

And a sending unit, configured to send a data packet to the at least one target device, where the data packet includes the allowed receiving moment and the data.
The device according to claim 24, further comprising a receiving unit, configured to:

The first transmission delay is received from a control center.
The device of claim 25 wherein:

The receiving unit is further configured to receive at least one second transmission delay sent by the at least one target device;

The determining unit is further configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The device of claim 25 wherein:

The determining unit is further configured to calculate at least one second transmission delay corresponding to the at least one target device;

The sending unit is further configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The device according to claim 27, wherein the determining unit is specifically configured to:

Counting all transmission delays between the preset target time period and the first target device in the at least one target device;

The maximum value of all the transmission delays is used as the second transmission delay corresponding to the first target device.
The device according to claim 27 or 28, wherein the sending unit is specifically configured to:

Transmitting the at least one second transmission delay to a second target device of the at least one target device, such that the second target device forwards the at least one second transmission delay to the control center.
Apparatus according to any one of claims 24 to 29, wherein said source is The transmission network between the standby device and the at least one target device is a time division multiplexed TDM network, and the allowed reception time is carried in the TDM frame structure.
The device according to any one of claims 24 to 29, wherein the transmission network between the source device and the at least one target device is a packet network, and the allowed reception time is carried in a packet frame structure.
A device for synchronizing, wherein the device is a target device, including:

a receiving unit, configured to receive at least one data packet sent by the at least one source device, where each of the at least one data packet includes an allowable receiving time and data;

a processing unit, configured to record the allowed receiving moment and cache the data;

The processing unit is further configured to extract the cached data at the time of allowing reception.
The device according to claim 32, wherein the processing unit is further configured to:

If the current time exceeds the allowed reception time, the data packet is discarded.
The device according to claim 32, further comprising a transmitting unit,

The processing unit is further configured to: if the current time exceeds the allowed receiving time, record a difference between the current time and the allowed receiving time; discard the data packet;

The sending unit is configured to send the difference to a control center, so that the control center updates the first transmission delay according to the difference.
The device according to any one of claims 32 to 34, further comprising a transmitting unit,

The receiving unit is further configured to receive at least one second transmission delay sent by the at least one source device;

The sending unit is configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The device according to any one of claims 32 to 34, further comprising a transmitting unit,

The processing unit is further configured to calculate at least one second transmission delay between the at least one source device;

The sending unit is configured to send the at least one second transmission delay to the control center, so that the control center determines the first transmission delay according to the at least one second transmission delay.
The device according to claim 36, wherein said processing unit is specific Used for:

Counting all transmission delays between the preset time period and the first source device of the at least one source device;

The maximum value of all the transmission delays is used as the second transmission delay corresponding to the first source device.
The device according to any one of claims 32 to 37, wherein the transmission network between the target device and the at least one source device is a time division multiplexed TDM network, and the allowed reception time is carried in a TDM frame. In the structure.
The device according to any one of claims 32 to 37, wherein the transmission network between the target device and the at least one source device is a packet network, and the allowed reception time is carried in a packet frame structure.
A device for synchronizing, wherein the device is a control center, including:

a determining unit, configured to determine a first transmission delay;

And a sending unit, configured to send the first transmission delay to the at least one source device.
The device according to claim 40, further comprising: a receiving unit, configured to: receive at least one second transmission delay sent by the at least one source device or the at least one target device;

The determining unit is specifically configured to: determine the first transmission delay according to the at least one second transmission delay.
The device according to claim 41, wherein the determining unit is configured to: use a maximum value of the at least one second transmission delay as the first transmission delay.
The device according to any one of claims 40 to 42, further comprising: a receiving unit, configured to: receive a difference value sent by the first target device in the at least one target device;

The determining unit is further configured to update the first transmission delay according to the difference.
The device according to claim 43, wherein the determining unit is configured to: determine a sum of the difference and the first transmission delay as an updated first transmission delay.
The device according to any one of claims 40 to 44, wherein the control center is deployed in one of the at least one source device.
The device according to any one of claims 40 to 44, wherein the control center is deployed in one of the at least one target device.