WO2018098746A1 - Procédé et dispositif de correction d'erreur de temps de synchronisation - Google Patents

Procédé et dispositif de correction d'erreur de temps de synchronisation Download PDF

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Publication number
WO2018098746A1
WO2018098746A1 PCT/CN2016/108145 CN2016108145W WO2018098746A1 WO 2018098746 A1 WO2018098746 A1 WO 2018098746A1 CN 2016108145 W CN2016108145 W CN 2016108145W WO 2018098746 A1 WO2018098746 A1 WO 2018098746A1
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time
base station
synchronization
error
signal
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PCT/CN2016/108145
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English (en)
Chinese (zh)
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朱杰作
张俊
赵振山
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华为技术有限公司
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Priority to CN201680091082.2A priority Critical patent/CN109983811B/zh
Priority to PCT/CN2016/108145 priority patent/WO2018098746A1/fr
Publication of WO2018098746A1 publication Critical patent/WO2018098746A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a synchronization time error correction method and device.
  • D2D communication based on cellular network, or Proximity Service (ProSe), means that user data can be directly transmitted between terminals without being transited through the network.
  • Proximity Service Proximity Service
  • D2D communication based on cellular networks Due to the potential of improving the system performance, improving the user experience and extending the application of cellular communication applications, D2D communication based on cellular networks has received extensive attention.
  • cellular network-based D2D communication can be direct communication from cell phone to cell phone, direct cell to vehicle communication, direct vehicle to vehicle communication, and direct communication from the vehicle to the roadside unit.
  • FIG. 1 is a schematic diagram of a system architecture of a D2D communication based on a cellular network.
  • the system architecture includes a base station, a device V1, a device V2, and a device V3.
  • Device V1 and device V2 are within the signal coverage of the base station, and device V3 is outside the signal coverage of the base station.
  • the device V1 and the device V2 can perform D2D communication
  • the device V2 and the device V3 can perform D2D communication
  • the device V1 and the device V3 can perform D2D communication.
  • the base station is mainly used for allocating and coordinating transmission resources in D2D communication.
  • the base station can be used to allocate transmission resources for D2D communication of device V1 and device V2, and for allocating transmission resources for D2D communication of device V1 and device V3.
  • D2D communication is often not normally performed between devices.
  • the embodiment of the invention discloses a synchronization time error correction method and device, which can correct the error of the synchronization time sent by the base station, and is beneficial to normal D2D communication between devices.
  • a synchronization time error correction method includes: receiving, by a first device, a time advancement amount TA sent by a base station in a state of being time synchronized with a base station; and acquiring, by the first device, the first device and the base station Synchronization time; the first device enters the error of the synchronization time by 0.5TA Correction.
  • the first device can correct the synchronization time to be consistent with the base station, thereby facilitating successful D2D communication between the devices.
  • the first device may also send a signal to the second device according to the time obtained by correcting the error of the synchronization time.
  • the second device is a device other than the base station.
  • the signal sent by the third device may also be received according to the time obtained by correcting the error of the synchronization time.
  • the first device may also detect whether the number of the searched GNSS satellites is less than a preset number in a state synchronized with the global satellite navigation system GNSS. If the number of GNSS satellites searched is less than the preset number, the first device ends the time synchronization with the GNSS and enters the punctual state; in the punctual state, if the first device is within the signal coverage of the base station, Then, the first device performs time synchronization with the base station and ends the punctual state.
  • D2D communication is normally performed between devices in the car network.
  • a device having the functionality to implement the first device behavior of the first aspect or the possible implementation of the first aspect described above.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • the unit can be software and/or hardware.
  • an apparatus comprising: one or more processors, a memory, a transceiver, a bus system and one or more programs, the processor, the transceiver and the memory are connected by a bus system; wherein one or more programs are stored in the memory, the one or more programs comprising instructions, the instructions causing the device when executed by the device Performing the method of the first aspect or the possible implementation of the first aspect.
  • a fourth aspect provides a computer readable storage medium storing one or more programs, the one or more programs comprising instructions that, when executed by the device, cause the device to perform the method of the first aspect or a possible implementation of the first aspect the way.
  • FIG. 1 is a schematic structural diagram of a system for D2D communication based on a cellular network according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a synchronization time error correction method according to an embodiment of the present invention
  • FIG. 3 is a schematic flow chart of another synchronization time error correction method according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of still another apparatus according to an embodiment of the present invention.
  • the existing cellular network-based D2D communication system is further analyzed.
  • a device that is within the signal coverage of the base station needs to perform time synchronization with the base station to ensure that the device within the signal coverage of the base station performs normal communication with other devices. That is, in the system architecture shown in FIG. 1, devices V1 and V2 need to maintain the same time as the base station, and devices V1 and V2 can communicate normally normally, and devices V1 and V2 need to be. Keeping at the same time as the base station can communicate directly with device V3.
  • the time of the device V1 and the device V2 is synchronized with the base station, and the time of the base station, the device V1, and the device V2 is both t1.
  • the base station needs to allocate the transmission resource to the device V1. If the transmission resource allocated by the base station for the device V1 is that the device V1 sends data of 1 ms (milliseconds) to the device V2 at t1, the device V1 will be from the t1. Start sending 1ms of data to device V2. Accordingly, the device V2 determines the data of 1 ms received from t1 as the data transmitted by the device V1.
  • the time of the device V1 and the base station is not synchronized, the time of the base station is t1, the time of the device V1 is t2, the time of the device V2 is t1, and the time of the device V3 is T1.
  • T2 is delayed by 1 ms from t1, and the base station designating device V1 transmits data to the device 3 at t1. Since the time of the device V1 is delayed by 1 ms from the time of the base station, the device V1 transmits data to V3 at the time when the time of the base station is "t1 plus 1 ms".
  • the device V2 transmits data to the device V3 at the time of "t1 plus 1 ms"
  • the device V2 transmits data to V2 when the time of the base station is "t1 plus 1 ms". Therefore, the device V3 receives the data transmitted by the device V1 and the device V2 at the same time "t1 plus 1 ms". Since device V1 and device V2 use the same frequency to transmit data to device V3, device V3 will not be able to tell which data was sent by device V1 and which data was sent by device V2. Therefore, the device in the signal coverage of the base station needs time synchronization with the base station to ensure that the device in the signal coverage of the base station performs normal communication with other devices.
  • the device V1 after the device V1 enters the signal coverage of the base station, the synchronization signal sent by the base station can be detected. If the synchronization time corresponding to the synchronization signal sent by the base station is t1, the device V1 receives the synchronization signal and then takes the time. Set to t1. The device V1 directly uses the synchronization time t1 as the downlink synchronization time, and transmits a signal to the device V2 (or the device V3) or the signal transmitted by the device V2 (or the device V3) based on the downlink synchronization time. Correspondingly, the device V1 sends a signal to the base station based on the uplink synchronization time.
  • the uplink synchronization time and the downlink synchronization time may be different or the same.
  • the base station and the device V1 have a radio wave transmission delay (for example, if the base station sends a synchronization signal to the device V1 and takes 1 ms, the radio wave transmission delay is 1 ms), so when the device V1 sets the time of the device V1 to t1, the base station The time is "t1 plus 1ms". The farther the distance between the device and the base station is, the greater the delay of the radio wave transmission. Can It can be seen that the synchronization time corresponding to the synchronization signal sent by the base station received by the existing device is not accurate, which causes the D2D communication to be normally not performed between the devices.
  • the embodiment of the present invention provides a synchronization time error correction method and device for correcting the error of the synchronization time sent by the base station.
  • FIG. 2 is a schematic flowchart diagram of a synchronization time error correction method according to an embodiment of the present invention. As shown in FIG. 2, the synchronization time error correction method may include sections 201-203.
  • the first device receives the time advancement amount TA sent by the base station in a state of performing time synchronization with the base station.
  • the first device may be a mobile phone, a wearable device (such as a smart watch, etc.), a tablet computer, a personal computer (PC, Personal Computer), a PDA (Personal Digital Assistant), a car computer, a car, and the like.
  • the first device may be any one of the devices under the signal coverage of the base station shown in FIG. 1.
  • the first device may be device V1 and device V2 shown in FIG. 1.
  • the function of the TA is to correct the synchronization time to obtain the uplink synchronization time, and the first device sends a signal to the base station based on the synchronization time of the line, that is, when the first device sends a signal to the base station, the delay of the radio wave transmission is compensated. Time sends a signal to the base station.
  • the TA is determined by the base station based on the received measurement report and then transmitted to the first device. In normal communication, when the first device approaches the base station, the base station notifies the first device to decrease the TA; and when the first device moves away from the base station, the base station requests the first device to increase the timing advance.
  • the first device is the device V1 shown in FIG. 1, if the time of the base station is t1, and the base station sends the synchronization signal to the device V1 for 1 ms, the time of the base station when the device V1 sets its own time to t1. "T1 plus 1ms". Therefore, the time of the first device is delayed by 1 ms from the time of the base station.
  • the base station wants to receive the signal sent by the device V1 when "t1 plus 2ms", since the device V1 itself has a delay of 1ms, and the device V1 needs to transmit a signal for 1ms, the device V1 needs to send a signal to the base station 2ms in advance, that is, The device V1 needs to start transmitting signals to the base station when its own time is t1.
  • TA is the time to send the signal in advance 2ms.
  • the time "t1 plus 2ms" after the TA correction for the time t1 of the device V1 is the uplink synchronization time.
  • 0.5TA is the error of the time of the device V1 and the base station.
  • the first device acquires a synchronization time that is synchronized by the first device and the base station.
  • the base station when the time of the base station is t1, the base station sends a synchronization signal to the device V1, the device V1 sets its own time to t1, and t1 is the synchronization time of the first device and the base station, that is, the device V1 itself. time.
  • the first device corrects the error of the synchronization time by using 0.5TA.
  • the first device corrects the error of the synchronization time by 0.5TA to obtain a time consistent with the base station.
  • the device V1 adds the synchronization time t2 of the device V1 to 1 ms seconds to obtain the time t1 that is consistent with the base station.
  • This time t1 is the downlink synchronization time obtained after the synchronization time is corrected.
  • the signal may be sent to the second device according to the time obtained by correcting the error of the synchronization time.
  • the time that the first device determines whether the error of the synchronization time is corrected is the time that the first device sets the signal sent by the first device to the second device; if the error of the synchronization time is corrected, the time is obtained.
  • the time of the base station is t1
  • the time of the device V1 is t2
  • the time of the device V3 is t1. Therefore, the TA transmitted by the base station received by the device V1 is 2 ms. If the transmission resource allocated by the base station to the device V1 is that the device V1 transmits 2 ms of data to the device V3 at t1, the device V1 corrects the error of t2 by 0.5 TA (that is, 1 ms), and the obtained time is "t2 plus 1 ms". If "t2 plus 1ms" is the same as t1, the device V1 starts transmitting 2 ms of data to the device V3 from this point. Accordingly, the device V3 determines the 2 ms data received from t1 as the data transmitted by the device V1.
  • the second device is a device other than the base station.
  • the second device may be the device V2 or the device V3.
  • the first device transmits a signal to the second device according to the time after the synchronization time is corrected by 0.5TA.
  • the first device sends a signal to the second device to the base station according to the time after the synchronization time is corrected by the TA.
  • the third device may also receive the time according to the error obtained by correcting the error of the synchronization time.
  • the signal sent the time that the first device determines whether the error of the synchronization time is corrected is the time that the third device sets the signal sent by the third device to the first device; if the error of the synchronization time is corrected, the time obtained is The time when the third device set by the base station sends a signal to the first device, the first device determines that the received signal is a signal sent by the third device.
  • the time of the base station is t1
  • the time of the device V1 is t2
  • the time of the device V3 is t1. Therefore, the TA transmitted by the base station received by the device V1 is 2 ms. If the transmission resource allocated by the base station to the device V3 is that the device V3 transmits data of 2 seconds to the device V1 at t1, the device V1 corrects the error of t2 by 0.5TA (that is, 1 ms), and obtains the time "t2 plus 1 ms" consistent with the base station. . If "t2 plus 1ms" is the same as t1, the device V1 determines that the signal received from this time is the signal transmitted by the device V3.
  • the time of the base station is t1
  • the time of the device V1 is t2
  • the time of the device V2 is t3.
  • the TA transmitted by the base station received by the device V1 is 2 ms.
  • the TA transmitted by the base station received by the device V2 is 4 ms. If the transmission resource allocated by the base station to the device V1 is that the device V1 transmits 2 ms of data to the device V2 at t1, the device V1 corrects the error of t2 by 0.5 TA (that is, 1 ms), and obtains the time "t2 plus 1 ms" consistent with the base station. .
  • the device V2 corrects the error of t3 by 0.5TA (ie, 2ms), and obtains the time "t3 plus 2ms" consistent with the base station. If “t2 plus 1ms” is the same as t1, the device V1 starts transmitting a signal to the device V2 from this point. Similarly, if “t3 plus 2ms” is the same as t1, the device V2 determines the signal received from this time as the signal transmitted by the device V2.
  • 0.5TA ie, 2ms
  • the first device may correct the synchronization time of the first device and the base station according to the 0.5TA, and obtain a time consistent with the base station, so that Send signals to other devices or receive signals sent by other devices according to the time coincident with the base station. It can be seen that by implementing the method described in FIG. 2, the first device can correct the synchronization time to be consistent with the base station, thereby facilitating successful D2D communication between the devices.
  • the Internet of Vehicles has attracted more and more people's attention. It can improve the safety of road traffic through D2D communication between vehicles and vehicles, D2D communication between mobile phones and vehicles, or D2D communication between vehicles and roadside units. Reliability, improve traffic efficiency.
  • the traditional car network system has the following Problem: When the number of vehicles in the system is large, resource conflicts are likely to occur, system performance is poor, delay is uncontrollable, quality of service (QoS) cannot be guaranteed, and transmission distance is limited.
  • the D2D communication technology based on cellular network has the advantages of low delay, large coverage, and support for high-speed mobile terminals.
  • Car-to-vehicle communication in a cellular network can fully utilize the base station for dynamic scheduling of transmission resources, thereby reducing the probability of communication collisions and solving the problem of uncontrollable delay. Therefore, D2D communication technology based on cellular networks is often applied to communication between vehicles and vehicles in a car network system, communication between a mobile phone and a vehicle, or communication between a vehicle and a roadside unit.
  • a Global Navigation Satellite System (GNSS) is synchronized with a base station, and a vehicle (a mobile device such as a mobile phone) can be associated with a GNSS or a base station. Synchronize. In general, the vehicle can be synchronized with the GNSS first, and then synchronized with the base station when there is no GNSS signal.
  • GNSS Global Navigation Satellite System
  • device V1, device V2, and device V3 are devices in a car network. Device V1 and device V2 are within the signal coverage of the base station, and device V1 and device V2 are outside the coverage of the GNSS signal.
  • Device V3 is outside the signal coverage of the base station and is within the coverage of the GNSS signal.
  • Device V1 and device V2 are synchronized with the base station, and device V3 is synchronized with the GNSS.
  • the synchronization time of devices synchronized with GNSS is very accurate. Therefore, the time of the base station, the GNSS, and the device V3 can be considered to be the same.
  • the synchronization signal has a transmission delay, and therefore, the time of the device V1 and the device V2 and the base station has an error. Therefore, there is an abnormality in the D2D communication between the device V1 and the device V2 and the device V3.
  • the synchronization time error correction method described above in FIG. 2 can also be applied to devices in a vehicle network.
  • it can be applied to the device V1, the device V2, and the device V3 described above. Therefore, the first device that executes the synchronization time error correction method described above with reference to FIG. 2 can execute the portions 304 to 306 shown in FIG. 3 before executing the portion 201 except for the portions 201 to 203.
  • the 301-303 part is the same as the part 201-203, and the specific implementation of the 301-303 part can be specifically described in the description of 201-203, and details are not described herein. among them:
  • the first device detects, in a time synchronization with the global satellite navigation system GNSS, whether the number of the searched GNSS satellites is less than a preset number.
  • the time synchronization may be preferentially performed with the GNSS.
  • Section 305 is performed when the first device detects that the number of GNSS satellites is less than a preset number.
  • the first device detects that the number of GNSS satellites is greater than or equal to a preset number Continue to synchronize time with GNSS and continue to measure whether the number of GNSS satellites searched is less than the preset number.
  • the first device ends the time synchronization with the GNSS and enters a punctual state.
  • the first device After the first device ends the time synchronization with the GNSS, it enters a punctual state, and in the punctual state, the time of the first device itself is considered to be consistent with the time of the GNSS.
  • the first device is in a punctual state, and if the first device is within the signal coverage of the base station, time synchronization is performed with the base station, and the punctual state is ended.
  • the first device if the first device is in the punctual state, if the synchronization signal of the base station is detected, the first device performs time synchronization with the base station, and ends the punctual state.
  • the punctual state can be maintained for a preset time, and after maintaining the punctual state of the preset time, the first device cannot communicate with other devices.
  • the first device may not communicate with other devices after a preset time even if time synchronization is performed with the base station.
  • part 301 can be performed to receive the TA sent by the base station.
  • D2D communication is normally performed between devices in the vehicle network.
  • the embodiment of the present invention may divide the functional unit into the first device according to the foregoing method example.
  • each functional unit may be divided according to each function, or two or more functions may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
  • the device may be the device in the above method embodiment.
  • the device includes a receiving module 401, an obtaining module 402, and a correcting module 403. among them:
  • the receiving module 401 is configured to receive a timing advance TA sent by the base station in a state of performing time synchronization with the base station.
  • the obtaining module 402 is configured to acquire a synchronization time of the device synchronized with the base station.
  • the correction module 403 is configured to correct the error of the synchronization time by 0.5TA.
  • FIG. 5 is a schematic structural diagram of another device according to an embodiment of the present invention.
  • FIG. 5 is optimized by FIG. 4.
  • FIG. 5 further includes a sending module 404, a detecting module 405, an ending module 406, and a synchronization module 407. among them:
  • the sending module 404 is configured to send a signal to the second device according to the time obtained by correcting the error of the synchronization time.
  • the second device is a device other than the base station.
  • the detecting module 405 is configured to detect, after the receiving module 401 receives the timing advance TA sent by the base station, whether the number of the searched GNSS satellites is less than a preset number in a state synchronized with the global satellite navigation system GNSS.
  • the ending module 406 is configured to end time synchronization with the GNSS and enter a punctual state when the detecting module 405 detects that the number of GNSS satellites searched is less than a preset number.
  • the synchronization module 407 is configured to perform time synchronization with the base station and end the punctual state if the device is within the signal coverage of the base station in the punctual state.
  • the receiving module 401 is further configured to receive the signal sent by the third device according to the time obtained by correcting the error of the synchronization time.
  • the principle of the device for solving the problem in the embodiment of the present invention is similar to the method for correcting the synchronization time error in the method embodiment of the present invention. Therefore, the implementation of the device can be referred to the implementation of the method. Let me repeat.
  • FIG. 6 is a schematic diagram of another possible structure of the device disclosed in the embodiment of the present invention.
  • the device 600 includes a processor 601, a memory 602, a bus system 603, and a transceiver 604.
  • the processor 601 and the memory 602 are connected by a bus system 603, and the transceiver 604 and the processor 601 are connected to the bus system 603. Connected.
  • the processor 601 can be a central processing unit (CPU), a general-purpose processor, a coprocessor, a digital signal processor (DSP), and an application-specific integrated circuit (ASIC). , Field Programmable Gate Array (FPGA) or other programmable logic devices, transistors Logic device, hardware component, or any combination thereof.
  • the processor 601 can also be a combination of computing functions, such as one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the bus system 603 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus system 603 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 6, but it does not mean that there is only one bus or one type of bus.
  • the transceiver 604 is configured to implement communication with other network elements, such as a base station.
  • the processor 601 calls the program code stored in the memory 602 to perform the following operations:
  • the error of the synchronization time is corrected by 0.5TA.
  • the processor 601 calls the program code stored in the memory 602, and is further configured to pass the time obtained by correcting the error of the synchronization time after correcting the error of the synchronization time by 0.5TA.
  • Transceiver 604 sends a signal to the second device.
  • the second device is a device other than the base station.
  • the processor 601 calls the program code stored in the memory 602, and is further configured to pass the time obtained by correcting the error of the synchronization time after correcting the error of the synchronization time by 0.5TA.
  • the transceiver 604 receives the signal transmitted by the third device.
  • the processor 601 calls the program code stored in the memory 602, and is further configured to perform time synchronization with the global satellite navigation system GNSS before receiving the time advance TA sent by the base station. Whether the number of GNSS satellites searched is less than the preset number; if the number of GNSS satellites searched is less than the preset number, the time synchronization with the GNSS is ended, and the punctual state is entered; in the punctual state, if the device is at the base station Within the signal coverage, it is time synchronized with the base station and ends the punctual state.
  • the principle of the device for solving the problem in the embodiment of the present invention is similar to the method for correcting the synchronization time error in the method embodiment of the present invention. Therefore, the implementation of the device can be referred to the implementation of the method. Let me repeat.
  • an embodiment of the present invention further provides a non-transitory computer readable storage medium storing one or more programs, the non-volatile computer readable storage medium storing at least one program, each of the programs Included in the instructions, when executed by the device provided by the embodiment of the present invention, the device is configured to perform the 201-203 part in FIG. 2, the 301-306 part in FIG. 3, or the first device in the foregoing method embodiment.
  • the device when executed by the device provided by the embodiment of the present invention, the device is configured to perform the 201-203 part in FIG. 2, the 301-306 part in FIG. 3, or the first device in the foregoing method embodiment.
  • the device is configured to perform the 201-203 part in FIG. 2, the 301-306 part in FIG. 3, or the first device in the foregoing method embodiment.
  • relational terms such as first, second, third, and pin number are used to distinguish one entity or operation from another entity or operation. It does not necessarily require or imply any such actual relationship or order between these entities or operations.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

Abstract

L'invention concerne un procédé et un dispositif de correction d'erreur de temps de synchronisation. Le procédé comprend les étapes suivantes : un premier dispositif reçoit, tout en effectuant une synchronisation temporelle avec une station de base, une valeur d'avance temporelle (TA) envoyée par la station de base (201) ; le premier dispositif acquiert un temps de synchronisation du premier dispositif se synchronisant avec la station de base (202) ; et le premier dispositif effectue une correction d'erreur sur le temps de synchronisation au moyen de 0,5 TA (203). De cette manière, le procédé de la présente invention permet au premier dispositif de corriger le temps de synchronisation pour qu'il soit cohérent avec celui de la station de base, et facilite en conséquence la communication D2D entre des dispositifs.
PCT/CN2016/108145 2016-11-30 2016-11-30 Procédé et dispositif de correction d'erreur de temps de synchronisation WO2018098746A1 (fr)

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CN201680091082.2A CN109983811B (zh) 2016-11-30 2016-11-30 一种同步时间误差修正方法及设备
PCT/CN2016/108145 WO2018098746A1 (fr) 2016-11-30 2016-11-30 Procédé et dispositif de correction d'erreur de temps de synchronisation

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CN111726771A (zh) * 2019-03-22 2020-09-29 中国信息通信研究院 一种车联网通信方法及设备
CN112073949A (zh) * 2020-08-24 2020-12-11 浙江大华技术股份有限公司 数据传输的方法及相关装置、设备

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