WO2024092818A1 - 同步源选择方法和装置 - Google Patents

同步源选择方法和装置 Download PDF

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Publication number
WO2024092818A1
WO2024092818A1 PCT/CN2022/130126 CN2022130126W WO2024092818A1 WO 2024092818 A1 WO2024092818 A1 WO 2024092818A1 CN 2022130126 W CN2022130126 W CN 2022130126W WO 2024092818 A1 WO2024092818 A1 WO 2024092818A1
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Prior art keywords
terminal device
synchronization source
base station
present disclosure
cell
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PCT/CN2022/130126
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English (en)
French (fr)
Inventor
杨星
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北京小米移动软件有限公司
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Application filed by 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to PCT/CN2022/130126 priority Critical patent/WO2024092818A1/zh
Publication of WO2024092818A1 publication Critical patent/WO2024092818A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present disclosure relates to the field of communication technology, and in particular to a synchronization source selection method and device.
  • the first terminal device can communicate with the base station through the relay of the second terminal device, wherein the first terminal device can be called a remote terminal device, and the second terminal device providing the relay function is called a relay terminal device.
  • the remote terminal device can be connected to the base station through the relay terminal device, and is directly connected to the base station.
  • terminal devices need to maintain a synchronization state for sidelink communication, wherein the terminal device can determine that the synchronization source is the base station based on the indication sent by the base station. In this case, the terminal device needs to maintain synchronization with the cell. However, if the terminal device cannot obtain the signal of the cell, it will not be able to maintain synchronization with the cell, which will cause the sidelink communication to fail. This is a problem that needs to be solved urgently.
  • the embodiments of the present disclosure provide a synchronization source selection method and apparatus, so that a first terminal device can maintain synchronization with a second terminal device or a GNSS that is an on-network terminal device during sidelink communication, thereby avoiding sidelink communication failure.
  • an embodiment of the present disclosure provides a synchronization source selection method, which is executed by a first terminal device, and the method includes: determining a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • the first terminal device determines the target synchronization source for sidelink communication, wherein the target synchronization source is the second terminal device or the global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • the first terminal device can keep synchronization with the second terminal device or the GNSS which is an online terminal device during the sidelink communication, thereby avoiding the failure of the sidelink communication.
  • an embodiment of the present disclosure provides another synchronization source selection method, which is executed by a second terminal device, and the method includes: sending an indication information to a first terminal device, wherein the indication information is used to indicate that the second terminal device is within network coverage, and the indication information is used by the first terminal device to determine that the second terminal device is an online terminal device, and to determine a target synchronization source for sidelink communication, wherein the target synchronization source is the second terminal device or GNSS.
  • an embodiment of the present disclosure provides another synchronization source selection method, which is executed by a base station, and the method includes: sending information for indicating that the synchronization source is a base station or information for indicating that the synchronization source of a specific frequency is a base station to a first terminal device, wherein the information for indicating that the synchronization source is a base station or the information for indicating that the synchronization source of a specific frequency is a base station is used by the first terminal device to determine a target synchronization source for sidelink communication, and the target synchronization source is a second terminal device or a GNSS, and the second terminal device is an online terminal device.
  • an embodiment of the present disclosure provides a communication device, which has some or all of the functions of the first terminal device in the method described in the first aspect above.
  • the functions of the communication device may have some or all of the functions in the embodiments of the present disclosure, or may have the functions of implementing any one of the embodiments of the present disclosure alone.
  • the functions may be implemented by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above functions.
  • the structure of the communication device may include a transceiver module and a processing module, and the processing module is configured to support the communication device to perform the corresponding functions in the above method.
  • the transceiver module is used to support communication between the communication device and other devices.
  • the communication device may also include a storage module, which is coupled to the transceiver module and the processing module, and stores computer programs and data necessary for the communication device.
  • the communication device includes: a processing module configured to determine a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • a processing module configured to determine a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • an embodiment of the present disclosure provides another communication device, which has some or all of the functions of the second terminal device in the method example described in the second aspect above.
  • the functions of the communication device may have some or all of the functions in the embodiments of the present disclosure, or may have the functions of implementing any one of the embodiments of the present disclosure alone.
  • the functions may be implemented by hardware, or may be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above functions.
  • the structure of the communication device may include a transceiver module and a processing module, and the processing module is configured to support the communication device to perform the corresponding functions in the above method.
  • the transceiver module is used to support communication between the communication device and other devices.
  • the communication device may also include a storage module, which is used to couple with the transceiver module and the processing module, and store the computer programs and data necessary for the communication device.
  • the communication device includes: a transceiver module, configured to send indication information to a first terminal device, wherein the indication information is used to indicate that the second terminal device is within network coverage, and the indication information is used by the first terminal device to determine that the second terminal device is an online terminal device.
  • an embodiment of the present disclosure provides another communication device, which has some or all of the functions of the base station in the method example described in the third aspect above.
  • the functions of the communication device may have some or all of the functions in the embodiments of the present disclosure, or may have the functions of implementing any one of the embodiments of the present disclosure alone.
  • the functions may be implemented by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above functions.
  • the structure of the communication device may include a transceiver module and a processing module, and the processing module is configured to support the communication device to perform the corresponding functions in the above method.
  • the transceiver module is used to support communication between the communication device and other devices.
  • the communication device may also include a storage module, which is coupled to the transceiver module and the processing module, and stores computer programs and data necessary for the communication device.
  • the communication device includes: a transceiver module, configured to indicate that the synchronization source is a base station or to indicate that the synchronization source of a specific frequency is a base station, wherein the information indicating that the synchronization source is a base station or the information indicating that the synchronization source of a specific frequency is a base station is used by the first terminal device to determine a target synchronization source for sidelink communication, the target synchronization source is a second terminal device or a GNSS, the second terminal device is an online terminal device, and the second terminal device is an online terminal device.
  • a transceiver module configured to indicate that the synchronization source is a base station or to indicate that the synchronization source of a specific frequency is a base station, wherein the information indicating that the synchronization source is a base station or the information indicating that the synchronization source of a specific frequency is a base station is used by the first terminal device to determine a target synchronization source for sidelink communication, the target synchronization source
  • an embodiment of the present disclosure provides a communication device, which includes a processor.
  • the processor calls a computer program in a memory, the method described in the first or second aspect is executed.
  • an embodiment of the present disclosure provides a communication device, which includes a processor.
  • the processor calls a computer program in a memory, the method described in the third aspect is executed.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the first or second aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the third aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the first or second aspect above.
  • an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the device to execute the method described in the third aspect above.
  • an embodiment of the present disclosure provides a synchronization source selection system, the system comprising the communication device described in the fourth aspect, the communication device described in the fifth aspect, and the communication device described in the sixth aspect, or the system comprising the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system comprising the communication device described in the ninth aspect and the communication device described in the tenth aspect, or the system comprising the communication device described in the eleventh aspect and the communication device described in the twelfth aspect.
  • an embodiment of the present invention provides a computer-readable storage medium for storing instructions for the above-mentioned terminal device, and when the instructions are executed, the terminal device executes the method described in the first aspect or the second aspect.
  • an embodiment of the present invention provides a readable storage medium for storing instructions for the above-mentioned base station. When the instructions are executed, the base station executes the method described in the third aspect.
  • the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first or second aspect above.
  • the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the third aspect above.
  • the present disclosure provides a chip system, which includes at least one processor and an interface, and is used to support a terminal device to implement the functions involved in the first aspect or the second aspect, for example, to determine or process at least one of the data and information involved in the above method.
  • the chip system also includes a memory, and the memory is used to store computer programs and data necessary for the terminal device.
  • the chip system can be composed of a chip, or it can include a chip and other discrete devices.
  • the present disclosure provides a chip system, which includes at least one processor and an interface, for supporting a base station to implement the functions involved in the third aspect, for example, determining or processing at least one of the data and information involved in the above method.
  • the chip system also includes a memory, which is used to store computer programs and data necessary for the base station.
  • the chip system can be composed of a chip, or it can include a chip and other discrete devices.
  • the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in the first or second aspect above.
  • the present disclosure provides a computer program which, when executed on a computer, enables the computer to execute the method described in the third aspect.
  • FIG1 is an architecture diagram of a communication system provided by an embodiment of the present disclosure.
  • FIG2 is a flow chart of a synchronization source selection method provided by an embodiment of the present disclosure
  • FIG3 is a flow chart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG4 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG5 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG6 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG7 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG8 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG9 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG10 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG11 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG12 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG13 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • FIG14 is a structural diagram of a communication device provided in an embodiment of the present disclosure.
  • FIG15 is a structural diagram of another communication device provided in an embodiment of the present disclosure.
  • FIG. 16 is a schematic diagram of the structure of a chip provided in an embodiment of the present disclosure.
  • a cell also called a cellular cell, refers to the area covered by a base station or a part of a base station (sector antenna) in a cellular mobile communication system, in which a mobile station can reliably communicate with the base station through a wireless channel.
  • a cell there can be one or more beams.
  • FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure.
  • the communication system may include, but is not limited to, a base station and a terminal device.
  • the number and form of the devices shown in FIG. 1 are only used as examples and do not constitute a limitation on the embodiments of the present disclosure. In actual applications, two or more base stations and two or more terminal devices may be included.
  • the communication system 10 shown in FIG. 1 includes, for example, a base station 101 and a terminal device 102.
  • LTE long term evolution
  • 5G fifth generation
  • NR 5G new radio
  • the base station 101 in the embodiment of the present disclosure is an entity on the network side for transmitting or receiving signals.
  • the base station 101 may be an evolved NodeB (eNB), a transmission point (TRP), a next generation NodeB (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system.
  • eNB evolved NodeB
  • TRP transmission point
  • gNB next generation NodeB
  • WiFi wireless fidelity
  • the embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the base station.
  • the base station provided in the embodiment of the present disclosure may be composed of a central unit (CU) and a distributed unit (DU), wherein the CU may also be referred to as a control unit.
  • CU central unit
  • DU distributed unit
  • the CU-DU structure may be used to split the base station, such as the protocol layer of the base station, and the functions of some protocol layers are placed in the CU for centralized control, and the functions of the remaining part or all of the protocol layers are distributed in the DU, and the DU is centrally controlled by the CU.
  • the terminal device 102 in the disclosed embodiment is an entity on the user side for receiving or transmitting signals, such as a mobile phone.
  • the terminal device may also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc.
  • the terminal device may be a car with communication function, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in a smart city (smart city), a wireless terminal device in a smart home (smart home), etc.
  • the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal device.
  • the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure.
  • a person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.
  • used to indicate may include being used to indicate directly or indirectly.
  • the information may include that the information directly indicates A or indirectly indicates A, but it does not mean that the information must carry A.
  • the information indicated by the information is called the information to be indicated.
  • the information to be indicated there are many ways to indicate the information to be indicated, such as but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or the index of the information to be indicated.
  • the information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance.
  • the indication of specific information can also be achieved by means of the arrangement order of each information agreed in advance (such as specified by the protocol), thereby reducing the indication overhead to a certain extent.
  • the information to be indicated can be sent as a whole or divided into multiple sub-information and sent separately, and the sending period and/or sending time of these sub-information can be the same or different.
  • the specific sending method is not limited in this disclosure. Among them, the sending period and/or sending time of these sub-information can be pre-defined, for example, pre-defined according to a protocol.
  • the first, second and various digital numbers are only used for the convenience of description and are not used to limit the scope of the embodiments of the present disclosure. For example, to distinguish different terminal devices.
  • the “protocol” involved in the embodiments of the present disclosure may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, a NR protocol, a WLAN protocol, and related protocols in other communication systems, which is not limited in the present disclosure.
  • the embodiments of the present disclosure list multiple implementation methods to clearly illustrate the technical solutions of the embodiments of the present disclosure.
  • the multiple embodiments provided by the embodiments of the present disclosure can be executed separately, or can be executed together with the methods of other embodiments of the embodiments of the present disclosure, or can be executed together with some methods in other related technologies separately or in combination; the embodiments of the present disclosure do not limit this.
  • the sidelink communication mode is introduced, and the interface between terminal devices is PC-5.
  • three transmission modes are supported on the sidelink: unicast, multicast and broadcast.
  • the sending terminal device sends SCI (Sidelink Control Information) on the PSCCH (physical sidelink control channel) channel and sends the second-stage SCI on the PSSCH (physical sidelink shared channel), which carries the resource location of the transmission data and the source and destination identifiers.
  • SCI Segmentlink Control Information
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink shared channel
  • each terminal device corresponds to a destination identifier.
  • each terminal device can belong to one or more groups, and each group corresponds to a destination identifier.
  • all terminal devices correspond to at least one destination identifier.
  • a terminal device can communicate with the base station through the relay of another terminal device instead of directly connecting to the base station.
  • the terminal device that is not connected to the base station is called the remote terminal device (remote UE), and the terminal device that provides relay function is called the relay terminal device (relay UE).
  • the remote terminal device and the relay terminal device communicate through sidelink unicast. This architecture is called U2N (UE to NW) relay. Even if the remote terminal device cannot receive the base station signal, the remote terminal device can still communicate with the network through the relay terminal device, thus expanding the network coverage.
  • U2N UE to NW
  • the remote terminal device in the idle state can send a system information request message to the relay terminal device, which carries the requested system information identifier.
  • the system information request message is a sidelinkRRC message (RemoteUEInformationSidelink).
  • the relay terminal device After receiving the request, the relay terminal device obtains the corresponding system information, and the relay terminal device sends the system information to the remote terminal device through a sidelinkRRC message (UuMessageTransferSidelink).
  • a remote terminal device in a connected state can send a system information request message to the base station.
  • the system information request message is an RRC message (DedicatedSIBRequest).
  • RRC radio resource control
  • terminal devices need to maintain a synchronized state in order to conduct sidelink communication.
  • the terminal device can determine that the synchronization source is the base station based on the indication sent by the base station. In this case, the terminal device needs to maintain synchronization with the cell. However, if the terminal device cannot obtain the signal of the cell, it will not be able to maintain synchronization with the cell, which will cause the sidelink communication to fail.
  • the first terminal device can communicate with the base station through the relay of the second terminal device, wherein the first terminal device can be called a remote terminal device, and the second terminal device providing the relay function is called a relay terminal device.
  • the remote terminal device can be connected to the base station through the relay terminal device and directly connected to the base station.
  • terminal devices need to maintain a synchronization state for sidelink communication, wherein the terminal device can determine that the synchronization source is the base station based on the indication sent by the base station. In this case, the terminal device needs to maintain synchronization with the cell. However, if the terminal device cannot obtain the signal of the cell, it will not be able to maintain synchronization with the cell, which will cause the sidelink communication to fail. This is a problem that needs to be solved urgently.
  • the embodiment of the present disclosure provides a synchronization source selection method, in which the first terminal device can determine that the target synchronization source is a second terminal device or a global navigation satellite system (GNSS) when determining to perform sidelink communication, wherein the second terminal device is an online terminal device.
  • the first terminal device can determine that the synchronization source is the second terminal device or the GNSS, and keep synchronization with the second terminal device or the GNSS, thereby avoiding sidelink communication failure.
  • GNSS global navigation satellite system
  • FIG. 2 is a flow chart of a synchronization source selection method provided in an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • S21 Determine a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, wherein the second terminal device is an online terminal device.
  • the target synchronization source is a second terminal device or a global navigation satellite system GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can be connected to the second terminal device through sidelink communication.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can keep in sync with the second terminal device or the GNSS which is an online terminal device during the sidelink communication, thereby avoiding the failure of the sidelink communication.
  • an online terminal device refers to a device that can communicate with a base station, such as a device that is within the network coverage of a base station; in some implementations, an online terminal device refers to a device that can establish a connection with a base station, or a device that has established a connection with a base station.
  • the second terminal device is an online terminal device.
  • a first terminal device may receive indication information sent by a second terminal device, wherein the indication information is used to indicate that the second terminal device is an online terminal device.
  • the indication information may be a sidelink master information block (MasterInformationBlockSidelink) message.
  • the sidelink main information block can carry an on-line indication. If the on-line indication is a "first value”, it means that the second terminal device is an on-line terminal device. Otherwise, it means that the second terminal device is not an on-line terminal device.
  • the first terminal device may receive a synchronization source indicated by the base station, or may not receive a synchronization source indicated by the base station. In the disclosed embodiment, the first terminal device may directly determine the target synchronization source without considering whether the base station indicates a synchronization source.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS in response to the first terminal device determining to perform sidelink communication and satisfying at least one of the following conditions:
  • the first terminal device has selected a relay terminal device
  • the first terminal device cannot select any cell as a synchronization source
  • the first terminal device cannot select any cell of a specific frequency as a synchronization source.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device in response to receiving information indicating that the synchronization source is a base station, determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device in response to the first terminal device being unable to select any cell as a synchronization source, determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS.
  • the target synchronization source in response to receiving information indicating that the synchronization source of a specific frequency is a base station, it is determined that the target synchronization source is a second terminal device or a GNSS.
  • the first terminal device in response to the first terminal device being unable to select a cell corresponding to a specific frequency as a synchronization source, determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device in response to receiving information indicating that the synchronization source of a specific frequency is a base station, and the first terminal device is unable to select any cell of the specific frequency as a synchronization source, the first terminal device determines that the target synchronization source is a second terminal device or a GNSS.
  • the first terminal device determines that the target synchronization source is a second terminal device or GNSS.
  • the target synchronization source is determined to be the second terminal device or the GNSS, wherein the second terminal device may be the relay terminal device.
  • the first terminal device determines to perform sidelink communication and receives information indicating that the synchronization source is a base station, it determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device determines to perform sidelink communication.
  • the first terminal device can be a remote terminal device or a relay terminal device.
  • the first terminal device can directly obtain information indicating that the synchronization source is a base station from the base station.
  • the first terminal device in a remote terminal device can directly obtain information indicating that the synchronization source is a base station from the base station, and the first terminal device in a non-connected state can obtain information used to indicate that the synchronization source is a base station from the relay terminal device.
  • the first terminal device receives SIB12 (system information block 12) or an RRC reconfiguration message sent by a base station, wherein the SIB12 or the RRC reconfiguration message is used to indicate that the synchronization source is the base station.
  • SIB12 system information block 12
  • RRC reconfiguration message sent by a base station
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device can determine that the synchronization source is the base station based on the base station indication, and select the corresponding cell as the synchronization source.
  • the first terminal device in response to receiving information indicating that the synchronization source is a base station, and the first terminal device cannot select any corresponding cell as the synchronization source, the first terminal device determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device when it performs sidelink communication, it needs to select a cell as a synchronization source. If no cell can be selected as a synchronization source, the target synchronization source can be determined to be the second terminal device or GNSS.
  • the first terminal device cannot detect a signal from any cell, and then the first terminal device determines that no cell can be selected as a synchronization source.
  • the first terminal device when the first terminal device cannot detect the signal of any cell, it is determined that the first terminal device cannot select any cell as a synchronization source.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, a cell on the sidelink communication frequency, or any cell.
  • the first terminal device determines to perform sidelink communication and receives information indicating that the synchronization source of a specific frequency is a base station, it determines that the target synchronization source is the second terminal device or the GNSS.
  • the first terminal device receives SIB12 or an RRC reconfiguration message sent by a base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source of a specific frequency is a base station; based on the SIB12 or RRC reconfiguration message, it is determined that information received is used to indicate that the synchronization source of the specific frequency is a base station.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that the received information indicating that the synchronization source of the specific frequency is the base station.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that the received information is used to indicate that the synchronization source of a specific frequency is the base station.
  • the first terminal device determines to maintain synchronization with the cell.
  • the first terminal device synchronizing with the second terminal device may select the second terminal device as the target synchronization source for the first terminal device to achieve synchronization with the second terminal device.
  • the first terminal device determines to maintain synchronization with a cell when the first terminal device is synchronized with the second terminal device, wherein the cell may be a cell where the first terminal device can receive signals, or may also be a service cell of the second terminal device.
  • the first terminal device determines a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication, thereby avoiding sidelink communication failure.
  • FIG. 3 is a flow chart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the target synchronization source is determined to be the second terminal device or the GNSS; wherein the second terminal device may be a relay terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can be found in the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication, thereby avoiding sidelink communication failure.
  • FIG. 4 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • S41 In response to receiving information indicating that the synchronization source is a base station, determining that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can be found in the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication.
  • the first terminal device can be a remote terminal device or a relay terminal device.
  • the first terminal device can directly obtain information indicating that the synchronization source is a base station from the base station.
  • the first terminal device in a remote terminal device can directly obtain information indicating that the synchronization source is a base station from the base station, and the first terminal device in a non-connected state can receive information indicating that the synchronization source is a base station from the relay terminal device.
  • the first terminal device receives SIB12 or RRC reconfiguration message sent by the base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is the base station; based on the SIB12 or RRC reconfiguration message, it is determined that information indicating that the synchronization source is the base station is received.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication, and can avoid sidelink communication failure.
  • FIG. 5 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • the first terminal determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can refer to the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication.
  • the first terminal device can be a remote terminal device or a relay terminal device.
  • the first terminal device can directly obtain information indicating that the synchronization source is a base station from the base station;
  • the first terminal device in a remote terminal device can directly obtain information indicating that the synchronization source is a base station from the base station, and the first terminal device in a non-connected state can obtain information from the base station indicating that the synchronization source is a base station from the relay terminal device.
  • the first terminal device receives SIB12 or RRC reconfiguration message sent by the base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is the base station; based on the SIB12 or RRC reconfiguration message, it is determined that information indicating that the synchronization source is the base station is received.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device can determine that the synchronization source is the base station based on the base station indication, and select the corresponding cell as the synchronization source.
  • the target synchronization source can be determined as the second terminal device or GNSS.
  • the first terminal device in response to the first terminal device being unable to detect a signal of any cell, it is determined that the first terminal device is unable to select any cell as a synchronization source.
  • the first terminal device when the first terminal device cannot detect the signal of any cell, it is determined that the first terminal device cannot select any cell as a synchronization source.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, a cell on the sidelink communication frequency, or any cell.
  • the first terminal determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication process, thereby avoiding sidelink communication failure.
  • FIG. 6 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the second terminal device when the first terminal device determines that a relay terminal device has been selected for sidelink communication, the second terminal device may be a relay terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can refer to the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication, the first terminal device has selected a relay terminal device, and the first terminal device can be a remote terminal device.
  • the first terminal device in a connected state can directly obtain information indicating that the synchronization source is the base station from the base station, and the first terminal device in a non-connected state can obtain information from the relay terminal device indicating that the synchronization source is the base station.
  • the first terminal device receives SIB12 or RRC reconfiguration message sent by the base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is the base station; based on the SIB12 or RRC reconfiguration message, it is determined that information indicating that the synchronization source is the base station is received.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication, and can avoid sidelink communication failure.
  • FIG. 7 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • S71 In response to the first terminal device having selected a relay terminal device for sidelink communication and receiving information indicating that the synchronization source is a base station, and the first terminal device being unable to select any cell as a synchronization source, determining that the target synchronization source is a second terminal device or GNSS, wherein the second terminal device is an online terminal device.
  • the second terminal device when the first terminal device determines that a relay terminal device has been selected for sidelink communication, the second terminal device may be a relay terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can refer to the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication, the first terminal device has selected a relay terminal device, and the first terminal device can be a remote terminal device.
  • the first terminal device in a connected state can directly obtain information indicating that the synchronization source is the base station from the base station, and the first terminal device in a non-connected state can obtain information from the relay terminal device indicating that the synchronization source is the base station.
  • the first terminal device receives SIB12 or RRC reconfiguration message sent by the base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is the base station; based on the SIB12 or RRC reconfiguration message, it is determined that information indicating that the synchronization source is the base station is received.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device can determine that the synchronization source is the base station based on the base station indication, and select the cell as the synchronization source.
  • the target synchronization source when the first terminal device performs sidelink communication, it is necessary to select a cell as a synchronization source. If no cell can be selected as a synchronization source, the target synchronization source can be determined to be the second terminal device or GNSS.
  • the first terminal device determines that the first terminal device cannot select any cell as a synchronization source in response to the first terminal device being unable to detect a signal of any cell.
  • the first terminal device when the first terminal device cannot detect the signal of any cell, it is determined that the first terminal device cannot select any cell as a synchronization source.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, a cell on the sidelink communication frequency, or any cell.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication, and can avoid sidelink communication failure.
  • FIG. 8 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can be found in the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication.
  • the first terminal device can be a remote terminal device or a relay terminal device.
  • the first terminal device can directly obtain information indicating that the synchronization source of a specific frequency is a base station from the base station.
  • the first terminal device in a connected state can directly obtain information indicating that the synchronization source of the specific frequency is the base station from the base station, and the first terminal device in a non-connected state can obtain information from the relay terminal device that the synchronization source of the base station is the base station.
  • the first terminal device receives SIB12 or an RRC reconfiguration message sent by a base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source of a specific frequency is a base station; based on the SIB12 or RRC reconfiguration message, it is determined that information received is used to indicate that the synchronization source of the specific frequency is a base station.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that the received information indicating that the synchronization source of the specific frequency is the base station.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that the received information is used to indicate that the synchronization source of the specific frequency is the base station.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication process, thereby avoiding sidelink communication failure.
  • FIG. 9 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • the first terminal device determines that the target synchronization source is a second terminal device or GNSS, wherein the second terminal device is an online terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can refer to the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication.
  • the first terminal device can be a remote terminal device or a relay terminal device.
  • the first terminal device can directly obtain information indicating that the synchronization source is a base station from the base station.
  • the first terminal device in a remote terminal device can directly obtain information indicating that the synchronization source is a base station from the base station, and the first terminal device in a non-connected state can obtain information from the base station indicating that the synchronization source is a base station from the relay terminal device.
  • the first terminal device receives SIB12 or an RRC reconfiguration message sent by a base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source of a specific frequency is a base station; based on the SIB12 or RRC reconfiguration message, it is determined that information indicating that the synchronization source is a base station is received.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that information indicating that the synchronization source is the base station has been received.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that information indicating that the synchronization source is the base station has been received.
  • the first terminal device can determine that the synchronization source of the specific frequency is the base station based on the indication of the base station, and select the cell of the specific frequency as the synchronization source.
  • the target synchronization source can be determined to be the second terminal device or GNSS.
  • the first terminal device determines that the first terminal device cannot select any cell as a synchronization source in response to the first terminal device being unable to detect a signal of any cell.
  • the first terminal device when the first terminal device cannot detect the signal of any cell of the specific frequency, it is determined that the first terminal device cannot select any cell of the specific frequency as a synchronization source.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, a cell on the sidelink communication frequency, or any cell.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication process, and can avoid sidelink communication failure.
  • FIG. 10 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • a first terminal device determines that a target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the second terminal device when the first terminal device determines that a relay terminal device has been selected for sidelink communication, the second terminal device may be a relay terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can be found in the relevant description in the above embodiment, which will not be repeated here.
  • the first terminal device determines to perform sidelink communication, the first terminal device has selected a relay terminal device, and the first terminal device can be a remote terminal device.
  • the first terminal device in a connected state can directly obtain information indicating that the synchronization source of a specific frequency is a base station from the base station, and the first terminal device in a non-connected state can obtain information from the relay terminal device indicating that the synchronization source of a specific frequency is a base station.
  • the first terminal device receives SIB12 or an RRC reconfiguration message sent by a base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is a base station; based on the SIB12 or RRC reconfiguration message, it is determined that the received information is used to indicate that the synchronization source of a specific frequency is a base station.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that the received information indicating that the synchronization source of the specific frequency is the base station.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that the received information is used to indicate that the synchronization source of the specific frequency is the base station.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication process, thereby avoiding sidelink communication failure.
  • FIG. 11 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by the first terminal device, and the method may include but is not limited to the following steps:
  • S111 In response to receiving a signal indicating that the synchronization source for a specific frequency is a base station and the first terminal device cannot select any cell of the specific frequency as a synchronization source, determining that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the second terminal device when the first terminal device determines that a relay terminal device has been selected for sidelink communication, the second terminal device may be a relay terminal device.
  • the method for the first terminal device to determine that the second terminal device is an online terminal device can be found in the relevant description in the above embodiment, which will not be described again here.
  • the first terminal device determines to perform sidelink communication, the first terminal device has selected a relay terminal device, and the first terminal device can be a remote terminal device.
  • the first terminal device in a connected state can directly obtain information indicating that the synchronization source of a specific frequency is a base station from the base station, and the first terminal device in a non-connected state can obtain information from the relay terminal device indicating that the synchronization source of a specific frequency is a base station.
  • the first terminal device receives SIB12 or an RRC reconfiguration message sent by a base station, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is a base station; based on the SIB12 or RRC reconfiguration message, it is determined that the received information is used to indicate that the synchronization source of a specific frequency is a base station.
  • the first terminal device receives SIB12 sent by the base station, and determines based on SIB12 that the received information indicating that the synchronization source of the specific frequency is the base station.
  • the first terminal device receives an RRC reconfiguration message sent by the base station, and determines, based on the RRC reconfiguration message, that the received information is used to indicate that the synchronization source of a specific frequency is the base station.
  • the first terminal device can determine that the synchronization source of the specific frequency is the base station based on the indication of the base station, and select the cell of the specific frequency as the synchronization source.
  • the target synchronization source can be determined to be the second terminal device or GNSS.
  • the first terminal device determines that the first terminal device cannot select any cell as a synchronization source in response to the first terminal device being unable to detect a signal of any cell.
  • the first terminal device when the first terminal device cannot detect the signal of any cell of the specific frequency, it is determined that the first terminal device cannot select any cell of the specific frequency as a synchronization source.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, a cell on the sidelink communication frequency, or any cell.
  • the first terminal device determines that the target synchronization source is a second terminal device or a GNSS, wherein the second terminal device is an online terminal device.
  • the first terminal device can maintain synchronization with the second terminal device or the GNSS, which is an online terminal device, during the sidelink communication process, thereby avoiding sidelink communication failure.
  • FIG. 12 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is performed by the second terminal device, and the method may include but is not limited to the following steps:
  • S121 Send indication information to a first terminal device used for sidelink communication, wherein the indication information is used to indicate that the second terminal device is an online terminal device.
  • the second terminal device may send indication information to the first terminal device, wherein the indication information is used to indicate that the second terminal device is an online terminal device.
  • the second terminal device may also send information to instruct the first terminal device to determine a target synchronization source, where the target synchronization source is the second terminal device or a GNSS.
  • the indication information can be used by the first terminal device to determine that the second terminal device is an online terminal device, and when the first terminal device determines to perform sidelink communication, determine that the target synchronization source is the second terminal device or GNSS.
  • the second terminal device sends indication information to the first terminal device, wherein the indication information is used to indicate that the second terminal device is within the network coverage, and the indication information is used by the first terminal device to determine that the second terminal device is an online terminal device, and when the first terminal device determines to perform sidelink communication, the target synchronization source is determined to be the second terminal device or GNSS.
  • the first terminal device can maintain synchronization with the second terminal device or GNSS that is an online terminal device during the sidelink communication process, and can avoid sidelink communication failure.
  • FIG. 13 is a flowchart of another synchronization source selection method provided by an embodiment of the present disclosure.
  • the method is executed by a base station, and the method may include but is not limited to the following steps:
  • S131 Sending to the first terminal device information indicating that the synchronization source is a base station or information indicating that the synchronization source of a specific frequency is a base station.
  • the base station may send a message to the first terminal device, where the message indicates that the synchronization source is the base station, or a synchronization source of a specific frequency.
  • the message may be a SIB12 or RRC reconfiguration message.
  • the message is used to indicate that the synchronization source is a base station, or that the synchronization source of a specific frequency is a base station.
  • the information used to indicate that the synchronization source is a base station or the information used to indicate that the synchronization source of a specific frequency is a base station is used by the first terminal device to determine the target synchronization source for sidelink communication, the target synchronization source is a second terminal device or GNSS, the second terminal device is an online terminal device, and the second terminal device is an online terminal device.
  • the first terminal device determines that the target synchronization source is the second terminal device or the GNSS; or, in response to the message indicating that the synchronization source is a base station, the first terminal device determines that the target synchronization source is the second terminal device or the GNSS; or, in response to the first terminal device being unable to select any cell as the synchronization source, the first terminal device determines that the target synchronization source is the second terminal device or the GNSS; or, in response to receiving information indicating that the synchronization source is a base station and the first terminal device is unable to select any corresponding cell as the synchronization source, the first terminal device determines that the target synchronization source is the second terminal device or the GNSS; or, in response to receiving information indicating that the synchronization source is a base station and the first terminal device is unable to select any corresponding cell as the synchronization source, the first terminal device determines that the target synchronization source is the second terminal device or the GNSS; or, in response to receiving information
  • SIB12 or RRC reconfiguration message can be used by the first terminal device to determine that the first base station indicates that the synchronization source is the base station, and when no cell can be selected as the synchronization source, determine that the target synchronization source is the second terminal device or GNSS.
  • the cell may be a cell that provides SIB12 or RRC reconfiguration messages, may be a cell on a sidelink communication frequency, or may be any cell.
  • the first base station may also send a SIB12 or RRC reconfiguration message to the first terminal device, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source of a specific frequency is the base station.
  • SIB12 or RRC reconfiguration message can be used by the first terminal device to determine that the synchronization source of the specific frequency indicated by the first base station is the base station, and when no cell can be selected as the synchronization source, determine that the target synchronization source is the second terminal device or GNSS.
  • the first base station sends a SIB12 or RRC reconfiguration message to the first terminal device, wherein the SIB12 or RRC reconfiguration message is used to indicate that the synchronization source is the base station, and the SIB12 or RRC reconfiguration message is used by the first terminal device to determine that the synchronization source indicated by the first base station is the base station, and when no cell can be selected as the synchronization source, the target synchronization source is determined to be the second terminal device or GNSS.
  • the first terminal device can maintain synchronization with the second terminal device or GNSS that is a terminal device on the network during the sidelink communication, and can avoid sidelink communication failure.
  • the methods provided by the embodiments of the present disclosure are introduced from the perspectives of the first terminal device, the second terminal device and the base station respectively.
  • the communication device 1 shown in Figure 14 may include a transceiver module 11 and a processing module 12.
  • the transceiver module may include a sending module and/or a receiving module, the sending module is used to implement a sending function, the receiving module is used to implement a receiving function, and the transceiver module may implement a sending function and/or a receiving function.
  • Communication device 1 configured in a first terminal device:
  • the device includes: a processing module 12.
  • the processing module 12 is configured to determine a target synchronization source for sidelink communication, wherein the target synchronization source is a second terminal device or a global navigation satellite system GNSS, and the second terminal device is an online terminal device.
  • the target synchronization source is a second terminal device or a global navigation satellite system GNSS
  • the second terminal device is an online terminal device.
  • the processing module 12 is further configured to determine a target synchronization source for sidelink communication in response to satisfying at least one of the following conditions:
  • the first terminal device has selected a relay terminal device
  • the first terminal device cannot select any cell as a synchronization source
  • the first terminal device cannot select any cell of a specific frequency as a synchronization source.
  • the device further includes: a transceiver module 11 .
  • the transceiver module 11 is configured to receive indication information sent by the second terminal device, wherein the indication information is used to indicate that the second terminal device is within the coverage of the network.
  • the processing module 12 is further configured to determine, according to the indication information, that the second terminal device is an online terminal device.
  • the second terminal device is a relay terminal device.
  • the processing module 12 is further configured to determine that the first terminal device cannot select any cell as a synchronization source in response to the first terminal device being unable to detect a signal of any cell.
  • the transceiver module 11 is further configured to receive a system signal block SIB12 or a radio resource control RRC reconfiguration message sent by a base station, wherein the SIB12 or the RRC reconfiguration message is used to indicate that the synchronization source is the base station.
  • the transceiver module 11 is further configured to receive a system signal block SIB12 or a radio resource control RRC reconfiguration message sent by a base station, wherein the SIB12 or the RRC reconfiguration message is used to indicate that the synchronization source of a specific frequency is the base station.
  • the processing module 12 is further configured to determine to maintain synchronization with the cell in response to the first terminal device being synchronized with the second terminal device.
  • the cell is a serving cell of the second terminal device.
  • the communication device 1 is configured in the second terminal device:
  • the device includes: a transceiver module 11.
  • the transceiver module 11 is configured to send indication information to the first terminal device, wherein the indication information is used to indicate that the second terminal device is within the network coverage, and the indication information is used by the first terminal device to determine that the second terminal device is an online terminal device.
  • the communication device 1 is configured in a base station:
  • the device includes: a transceiver module 11.
  • the transceiver module 11 is configured to send information indicating that the synchronization source is a base station or information indicating that the synchronization source of a specific frequency is a base station to the first terminal device, wherein the information indicating that the synchronization source is a base station or the information indicating that the synchronization source of a specific frequency is a base station is used by the first terminal device to determine a target synchronization source for sidelink communication, and the target synchronization source is a second terminal device or a GNSS, and the second terminal device is an online terminal device.
  • the communication device 1 provided in the above embodiments of the present disclosure achieves the same or similar beneficial effects as the synchronization source selection methods provided in some of the above embodiments, which will not be described in detail here.
  • FIG 15 is a schematic diagram of the structure of another communication device 1000 provided in an embodiment of the present disclosure.
  • the communication device 1000 can be a terminal device, or a network side device, or a chip, a chip system, or a processor that supports the terminal device to implement the above method, or a chip, a chip system, or a processor that supports the network side device to implement the above method.
  • the communication device 1000 can be used to implement the method described in the above method embodiment, and the details can be referred to the description in the above method embodiment.
  • the communication device 1000 may include one or more processors 1001.
  • the processor 1001 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit.
  • the baseband processor may be used to process the communication protocol and the communication data
  • the central processing unit may be used to control the communication device (such as a network side device, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a computer program, and process the data of the computer program.
  • the communication device 1000 may further include one or more memories 1002, on which a computer program 1004 may be stored, and the memory 1002 executes the computer program 1004 so that the communication device 1000 executes the method described in the above method embodiment.
  • data may also be stored in the memory 1002.
  • the communication device 1000 and the memory 1002 may be provided separately or integrated together.
  • the communication device 1000 may further include a transceiver 1005 and an antenna 1006.
  • the transceiver 1005 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing a transceiver function.
  • the transceiver 1005 may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.
  • the communication device 1000 may further include one or more interface circuits 1007.
  • the interface circuit 1007 is used to receive code instructions and transmit them to the processor 1001.
  • the processor 1001 executes the code instructions to enable the communication device 1000 to execute the method described in the above method embodiment.
  • the communication apparatus 1000 is a first terminal device: the processor 1001 is used to execute S21 in FIG. 2 : S31 in FIG. 3 : S41 in FIG. 4 ; S51 in FIG. 5 ; S62 in FIG. 6 ; S71 in FIG. 7 ; S81 in FIG. 8 ; S91 in FIG. 9 ; S101 in FIG. 10 ; and S111 in FIG. 11 .
  • the communication device 1000 is a second terminal device: the transceiver 1005 is used to execute S121 in Figure 12.
  • the communication device 1000 is a base station: the transceiver 1005 is used to execute S131 in FIG. 13 .
  • the processor 1001 may include a transceiver for implementing receiving and sending functions.
  • the transceiver may be a transceiver circuit, an interface, or an interface circuit.
  • the transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated.
  • the above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.
  • the processor 1001 may store a computer program 1003, which runs on the processor 1001 and enables the communication device 1000 to perform the method described in the above method embodiment.
  • the computer program 1003 may be fixed in the processor 1001, in which case the processor 1001 may be implemented by hardware.
  • the communication device 1000 may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiments.
  • the processor and transceiver described in the present disclosure may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc.
  • the processor and transceiver may also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.
  • CMOS complementary metal oxide semiconductor
  • NMOS N-type metal oxide semiconductor
  • PMOS P-type metal oxide semiconductor
  • BJT bipolar junction transistor
  • BiCMOS bipolar CMOS
  • SiGe silicon germanium
  • GaAs gallium arsenide
  • the communication device described in the above embodiments may be a terminal device or a network side device, but the scope of the communication device described in the present disclosure is not limited thereto, and the structure of the communication device may not be limited by FIG. 15.
  • the communication device may be an independent device or may be part of a larger device.
  • the communication device may be:
  • the IC set may also include a storage component for storing data and computer programs;
  • ASIC such as modem
  • FIG. 16 is a structural diagram of a chip provided in an embodiment of the present disclosure.
  • the chip 1100 includes a processor 1101 and an interface 1103.
  • the number of the processor 1101 may be one or more, and the number of the interface 1103 may be multiple.
  • the interface 1103 is used to receive code instructions and transmit them to the processor.
  • the processor 1101 is used to run code instructions to execute the synchronization source selection method as described in some of the above embodiments.
  • the interface 1103 is used to receive code instructions and transmit them to the processor.
  • the processor 1101 is used to run code instructions to execute the synchronization source selection method as described in some of the above embodiments.
  • the interface 1103 is used to receive code instructions and transmit them to the processor.
  • the processor 1101 is used to run code instructions to execute the synchronization source selection method as described in some of the above embodiments.
  • the chip 1100 further includes a memory 1102, and the memory 1102 is used to store necessary computer programs and data.
  • An embodiment of the present disclosure also provides a synchronization source selection system, which includes the communication device as the first terminal device, the communication device as the second terminal device and the communication device as the base station in the embodiment of Figure 14 above, or the system includes the communication device as the first terminal device, the communication device as the second terminal device and the communication device as the base station in the embodiment of Figure 15 above.
  • the present disclosure also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.
  • the present disclosure also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.
  • the computer program product includes one or more computer programs.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • the computer program can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer program can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.
  • a magnetic medium e.g., a floppy disk, a hard disk, a magnetic tape
  • an optical medium e.g., a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD solid state disk
  • At least one in the present disclosure may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present disclosure.
  • the technical features in the technical feature are distinguished by “first”, “second”, “third”, “A”, “B”, “C” and “D”, etc., and there is no order of precedence or size between the technical features described by the "first”, “second”, “third”, “A”, “B”, “C” and “D”.
  • the corresponding relationships shown in the tables in the present disclosure can be configured or predefined.
  • the values of the information in each table are only examples and can be configured as other values, which are not limited by the present disclosure.
  • the corresponding relationships shown in some rows may not be configured.
  • appropriate deformation adjustments can be made based on the above table, such as splitting, merging, etc.
  • the names of the parameters shown in the titles of the above tables can also use other names that can be understood by the communication device, and the values or representations of the parameters can also be other values or representations that can be understood by the communication device.
  • other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables.
  • the predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

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Abstract

本公开实施例公开了一种同步源选择方法和装置，可应用于通信技术领域，由第一终端设备执行的方法包括：确定进行侧行链路sidelink通信的目标同步源，其中，目标同步源为第二终端设备或全球导航卫星系统GNSS，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。

Description

同步源选择方法和装置 技术领域
本公开涉及通信技术领域，尤其涉及一种同步源选择方法和装置。
背景技术
为了支持终端设备与终端设备之间的直接通信，引入了侧行链路(sidelink)通信方式。其中，第一终端设备可以通过第二终端设备的中继实现与基站的通信，其中第一终端设备可以称为远端终端设备，提供中继功能的第二终端设备称为中继终端设备。并且，远端终端设备可以通过中继终端设备与基站连接，且与基站直接连接。
相关技术中，终端设备之间需要保持同步状态以进行sidelink通信，其中，终端设备可以基于基站发送的指示确定同步源为基站，在此情况下，终端设备需要与小区保持同步，但是，若终端设备无法获取到小区的信号，此时将无法与小区保持同步，会导致sidelink通信失败，这是亟需解决的问题。
发明内容
本公开实施例提供一种同步源选择方法和装置，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
第一方面，本公开实施例提供一种同步源选择方法，该方法由第一终端设备执行，该方法包括：确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备
在该技术方案中，第一终端设备确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
第二方面，本公开实施例提供另一种同步源选择方法，该方法由第二终端设备执行，该方法包括：向第一终端设备发送指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内，所述指示信息用于所述第一终端设备确定所述第二终端设备为在网终端设备，且确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS。
第三方面，本公开实施例提供又一种同步源选择方法，该方法由基站执行，该方法包括：向第一终端设备发送用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息，其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
第四方面，本公开实施例提供一种通信装置，该通信装置具有实现上述第一方面所述的方法中第一终端设备的部分或全部功能，比如通信装置的功能可具备本公开中的部分或全部实施例中的功能，也可以具备单独实施本公开中的任一个实施例的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。
在一种实现方式中，该通信装置的结构中可包括收发模块和处理模块，所述处理模块被配置为支持通信装置执行上述方法中相应的功能。所述收发模块用于支持通信装置与其他设备之间的通信。所述通信装置还可以包括存储模块，所述存储模块用于与收发模块和处理模块耦合，其保存通信装置必要的计算机程序和数据。
在一种实现方式中，所述通信装置包括：处理模块，被配置为确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。
第五方面，本公开实施例提供另一种通信装置，该通信装置具有实现上述第二方面所述的方法示例中第二终端设备的部分或全部功能，比如通信装置的功能可具备本公开中的部分或全部实施例中的功能，也可以具备单独实施本公开中的任一个实施例的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。
在一种实现方式中，该通信装置的结构中可包括收发模块和处理模块，该处理模块被配置为支持通信装置执行上述方法中相应的功能。收发模块用于支持通信装置与其他设备之间的通信。所述通信装置还可以包括存储模块，所述存储模块用于与收发模块和处理模块耦合，其保存通信装置必要的计算机程序和数据。
在一种实现方式中，所述通信装置包括：收发模块，被配置为向第一终端设备发送指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内，所述指示信息用于所述第一终端设备确定所述第二终端设备为在网终端设备。
第六方面，本公开实施例提供另一种通信装置，该通信装置具有实现上述第三方面所述的方法示例中基站的部分或全部功能，比如通信装置的功能可具备本公开中的部分或全部实施例中的功能，也可以具备单独实施本公开中的任一个实施例的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。
在一种实现方式中，该通信装置的结构中可包括收发模块和处理模块，该处理模块被配置为支持通信装置执行上述方法中相应的功能。收发模块用于支持通信装置与其他设备之间的通信。所述通信装置还可以包括存储模块，所述存储模块用于与收发模块和处理模块耦合，其保存通信装置必要的计算机程序和数据。
在一种实现方式中，所述通信装置包括：收发模块，被配置为用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息，其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
第七方面，本公开实施例提供一种通信装置，该通信装置包括处理器，当该处理器调用存储器中的计算机程序时，执行上述第一方面或第二方面所述的方法。
第八方面，本公开实施例提供一种通信装置，该通信装置包括处理器，当该处理器调用存储器中的计算机程序时，执行上述第三方面所述的方法。
第九方面，本公开实施例提供一种通信装置，该通信装置包括处理器和存储器，该存储器中存储有计算机程序；所述处理器执行该存储器所存储的计算机程序，以使该通信装置执行上述第一方面或第二方面所述的方法。
第十方面，本公开实施例提供一种通信装置，该通信装置包括处理器和存储器，该存储器中存储有计算机程序；所述处理器执行该存储器所存储的计算机程序，以使该通信装置执行上述第三方面所述的方法。
第十一方面，本公开实施例提供一种通信装置，该装置包括处理器和接口电路，该接口电路用于接收代码指令并传输至该处理器，该处理器用于运行所述代码指令以使该装置执行上述第一方面或第二方面所述的方法。
第十二方面，本公开实施例提供一种通信装置，该装置包括处理器和接口电路，该接口电路用于接收代码指令并传输至该处理器，该处理器用于运行所述代码指令以使该装置执行上述第三方面所述的方法。
第十三方面，本公开实施例提供一种同步源选择系统，该系统包括第四方面所述的通信装置、第五方面所述的通信装置以及第六方面所述的通信装置，或者，该系统包括第七方面所述的通信装置以及第八方面所述的通信装置，或者，该系统包括第九方面所述的通信装置以及第十方面所述的通信装置，或者，该系统包括第十一方面所述的通信装置以及第十二方面所述的通信装置。
第十四方面，本发明实施例提供一种计算机可读存储介质，用于储存为上述终端设备所用的指令，当所述指令被执行时，使所述终端设备执行上述第一方面或第二方面所述的方法。
第十五方面，本发明实施例提供一种可读存储介质，用于储存为上述基站所用的指令，当所述指令被执行时，使所述基站执行上述第三方面所述的方法。
第十六方面，本公开还提供一种包括计算机程序的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面或第二方面所述的方法。
第十七方面，本公开还提供一种包括计算机程序的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第三方面所述的方法。
第十八方面，本公开提供一种芯片系统，该芯片系统包括至少一个处理器和接口，用于支持终端设备实现第一方面或第二方面所涉及的功能，例如，确定或处理上述方法中所涉及的数据和信息中的至少一种。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存终端设备必要的计算机程序和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
第十九方面，本公开提供一种芯片系统，该芯片系统包括至少一个处理器和接口，用于支持基站实现第三方面所涉及的功能，例如，确定或处理上述方法中所涉及的数据和信息中的至少一种。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存基站必要的计算机程序和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
第二十方面，本公开提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述第一方面 或第二方面所述的方法。
第二十一方面，本公开提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述第三方面所述的方法。
附图说明
为了更清楚地说明本公开实施例或背景技术中的技术方案，下面将对本公开实施例或背景技术中所需要使用的附图进行说明。
图1是本公开实施例提供的一种通信系统的架构图；
图2是本公开实施例提供的一种同步源选择方法的流程图；
图3是本公开实施例提供的另一种同步源选择方法的流程图；
图4是本公开实施例提供的又一种同步源选择方法的流程图；
图5是本公开实施例提供的又一种同步源选择方法的流程图；
图6是本公开实施例提供的又一种同步源选择方法的流程图；
图7是本公开实施例提供的又一种同步源选择方法的流程图；
图8是本公开实施例提供的又一种同步源选择方法的流程图；
图9是本公开实施例提供的又一种同步源选择方法的流程图；
图10是本公开实施例提供的又一种同步源选择方法的流程图；
图11是本公开实施例提供的又一种同步源选择方法的流程图；
图12是本公开实施例提供的又一种同步源选择方法的流程图；
图13是本公开实施例提供的又一种同步源选择方法的流程图；
图14是本公开实施例提供的一种通信装置的结构图；
图15是本公开实施例提供的另一种通信装置的结构图；
图16是本公开实施例提供的一种芯片的结构示意图。
具体实施方式
为了便于理解，首先介绍本公开涉及的术语。
1、小区(移动通信术语)
小区，也可以称为蜂窝小区，是指在蜂窝移动通信系统中，其中的一个基站或基站的一部分(扇形天线)所覆盖的区域，在这个区域内移动台可以通过无线信道可靠地与基站进行通信。在一个小区中，可以存在一个或多个波束。
为了更好的理解本公开实施例公开的一种同步源选择方法和装置，下面首先对本公开实施例适用的通信系统进行描述。
请参见图1，图1为本公开实施例提供的一种通信系统的架构示意图。该通信系统可包括但不限于一个基站和一个终端设备，图1所示的设备数量和形态仅用于举例并不构成对本公开实施例的限定，实际应用中可以包括两个或两个以上的基站，两个或两个以上的终端设备。图1所示的通信系统10以包括一个基站101和一个终端设备102为例。
需要说明的是，本公开实施例的技术方案可以应用于各种通信系统。例如：长期演进(long term evolution，LTE)系统、第五代(5th generation，5G)移动通信系统、5G新空口(new radio，NR)系统，或者其他未来的新型移动通信系统等。
本公开实施例中的基站101是网络侧的一种用于发射或接收信号的实体。例如，基站101可以为演进型基站(evolved NodeB，eNB)、传输点(transmission reception point，TRP)、NR系统中的下一代基站(next generation NodeB，gNB)、其他未来移动通信系统中的基站或无线保真(wireless fidelity，WiFi)系统中的接入节点等。本公开的实施例对基站所采用的具体技术和具体设备形态不做限定。本公开实施例提供的基站可以是由集中单元(central unit，CU)与分布式单元(distributed unit，DU)组成的，其中，CU也可以称为控制单元(control unit)，采用CU-DU的结构可以将基站，例如基站的协议层拆分开，部分协议层的功能放在CU集中控制，剩下部分或全部协议层的功能分布在DU中，由CU集中控制DU。
本公开实施例中的终端设备102是用户侧的一种用于接收或发射信号的实体，如手机。终端设备也可以称为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端设备(mobile terminal，MT)等。终端设备可以是具备通信功能的汽车、智能汽车、手机(mobile phone)、穿戴式设备、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self-driving)中 的无线终端设备、远程手术(remote medical surgery)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备、智慧家庭(smart home)中的无线终端设备等等。本公开的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
可以理解的是，本公开实施例描述的通信系统是为了更加清楚的说明本公开实施例的技术方案，并不构成对于本公开实施例提供的技术方案的限定，本领域普通技术人员可知，随着系统架构的演变和新业务场景的出现，本公开实施例提供的技术方案对于类似的技术问题，同样适用。
此外，为了便于理解本公开实施例，做出以下几点说明。
第一，本公开实施例中，“用于指示”可以包括用于直接指示和用于间接指示。当描述某一信息用于指示A时，可以包括该信息直接指示A或间接指示A，而并不代表该信息中一定携带有A。
将信息所指示的信息称为待指示信息，则具体实现过程中，对待指示信息进行指示的方式有很多种，例如但不限于，可以直接指示待指示信息，如待指示信息本身或者该待指示信息的索引等。也可以通过指示其他信息来间接指示待指示信息，其中该其他信息与待指示信息之间存在关联关系。还可以仅仅指示待指示信息的一部分，而待指示信息的其他部分则是已知的或者提前约定的。例如，还可以借助预先约定(例如协议规定)的各个信息的排列顺序来实现对特定信息的指示，从而在一定程度上降低指示开销。
待指示信息可以作为一个整体一起发送，也可以分成多个子信息分开发送，而且这些子信息的发送周期和/或发送时机可以相同，也可以不同。具体发送方法本公开不进行限定。其中，这些子信息的发送周期和/或发送时机可以是预先定义的，例如根据协议预先定义的。
第二，在本公开中第一、第二以及各种数字编号(例如，“#1”、“#2”)仅为描述方便进行的区分，并不用来限制本公开实施例的范围。例如，区分不同的终端设备等。
第三，本公开实施例中涉及的“协议”可以是指通信领域的标准协议，例如可以包括LTE协议、NR协议、WLAN协议以及其他通信系统中的相关协议，本公开对此不做限定。
第四，本公开实施例列举了多个实施方式以对本公开实施例的技术方案进行清晰地说明。当然，本领域内技术人员可以理解，本公开实施例提供的多个实施例，可以被单独执行，也可以与本公开实施例中其他实施例的方法结合后一起被执行，还可以单独或结合后与其他相关技术中的一些方法一起被执行；本公开实施例并不对此进行限定。
为了支持终端设备与终端设备之间的直接通信，引入了sidelink通信方式，终端设备与终端设备之间的接口为PC-5。根据发送终端设备和接收终端设备的对应关系，在sidelink上支持三种传输方式，单播，组播和广播。发送终端设备在PSCCH(physical sidelink control channel，物理直连链路控制信道)信道上发送SCI(Sidelink Control Information，sidelink控制信息)以及在PSSCH(physical sidelink shared channel，物理直连链路共享信道)信道上发送第二阶段SCI，其中携带传输数据的资源位置以及源和目标标识等。接收终端设备在收到SCI后，根据其中的源终端设备和目的终端设备标识确定是否接收对应的数据以及对应哪个进程。在单播连接中，每个终端设备都对应一个目的标识，在组播中，每个终端设备可以属于一个或多个组，每个组与一个目的标识相对应，在广播中，所有终端设备都至少与一个目的标识相对应。
一个终端设备可以不直接与基站连接而通过另外一个终端设备的中继实现与基站的通信，其中与基站没有连接的终端设备称为远端终端设备(remote UE)，提供中继功能的终端设备称为中继终端设备(relay UE)，远端终端设备与中继终端设备之间通过sidelink单播通信，这种架构称为U2N(UE to NW)中继。即使远端终端设备无法收到基站信号，远端终端设备也可以通过中继终端设备与网络保持通信，因此可以扩大网络的覆盖。
其中，处于空闲态的远端终端设备可以向中继终端设备发送系统信息请求消息，其中携带请求的系统信息标识。所述系统信息请求消息为sidelinkRRC消息(RemoteUEInformationSidelink)。中继终端设备收到请求之后，获取相应的系统信息，中继终端设备通过sidelinkRRC消息(UuMessageTransferSidelink)将系统信息发送给远端终端设备。
处于连接态的远端终端设备可以向基站发送系统信息请求消息，系统信息请求消息为RRC消息(DedicatedSIBRequest)，基站收到后，将请求的系统信息通过RRC(radio resource control，无线资源控制)重配消息通过中继终端设备发送给远端终端设备。
相关技术中，终端设备之间需要保持同步状态才能进行sidelink通信，终端设备可以基于基站发送的指示确定同步源为基站，在此情况下，终端设备需要与小区保持同步，但是，若终端设备无法获取到小区的信号，此时将无法与小区保持同步，会导致sidelink通信失败。
为了支持终端设备与终端设备之间的直接通信，引入了侧行链路(sidelink)通信方式。其中，第一终端设备可以通过第二终端设备的中继实现与基站的通信，其中第一终端设备可以称为远端终端设备， 提供中继功能的第二终端设备称为中继终端设备。并且，远端终端设备可以在通过中继终端设备与基站连接，且与基站直接连接。
相关技术中，终端设备之间需要保持同步状态以进行sidelink通信，其中，终端设备可以基于基站发送的指示确定同步源为基站，在此情况下，终端设备需要与小区保持同步，但是，若终端设备无法获取到小区的信号，此时将无法与小区保持同步，会导致sidelink通信失败，这是亟需解决的问题。
基于此，本公开实施例提供一种同步源选择方法，第一终端设备在确定进行sidelink通信的情况下，可以确定目标同步源为第二终端设备或全球导航卫星系统(global navigation satellite system，GNSS)，其中，第二终端设备为在网终端设备。由此，第一终端设备可以确定同步源为第二终端设备或GNSS，并与第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
下面结合附图对本公开所提供的一种同步源选择方法和装置进行详细地介绍。
请参见图2，图2是本公开实施例提供的一种同步源选择方法的流程图。
如图2所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S21：确定侧行链路sidelink通信的目标同步源，其中所述目标同步源为第二终端设备或全球导航卫星系统GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备可以通过sidelink通信与所述第二终端设备连接。
本公开实施例中，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。可以理解的是，在网终端设备是指能够与基站通信的设备，例如是处于基站的网络覆盖范围内；在一些实现方式中，在网终端设备是指能够与基站建立连接的设备，或是已经与基站建立连接的设备。其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备可以接收第二终端设备发送的指示信息，其中，指示信息用于指示第二终端设备为在网终端设备。
其中，指示信息可以为侧行链路主信息块(MasterInformationBlockSidelink)消息。
其中，侧行链路主信息块中可以携带在网指示，若在网指示为“第一值”，则说明第二终端设备为在网终端设备，相反，则说明第二终端设备不是在网终端设备。
需要说明的是，在sidelink通信场景下，第一终端设备可能接收到基站指示同步源，或者未接收到基站指示的同步源。本公开实施例中，第一终端设备可以不考虑基站是否指示同步源，直接确定目标同步源。
在一些实施例中，第一终端设备响应于第一终端设备确定进行sidelink通信，且满足以下至少一种条件，确定目标同步源为第二终端设备或GNSS：
第一终端设备已选择中继终端设备；
接收到用于指示同步源为基站的信息；
第一终端设备无法选择任何小区作为同步源；
接收到用于指示特定频率的同步源为基站的信息；
第一终端设备无法选择特定频率的任何小区作为同步源。
本公开实施例中，响应于已选择中继终端设备，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于接收到用于指示同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于第一终端设备无法选择任何小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于接收到用于指示同步源为基站的信息，且第一终端设备无法选择任何对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于接收到用于指示特定频率的同步源为基站的信息，确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于接收到用于指示特定频率的同步源为基站的信息，以及第一终端设备无法选择特定频率的任何小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS。
本公开实施例中，响应于第一终端已选择中继终端设备作为同步源，且接收到用于指示特定频率的同步源为基站的信息，以及第一终端设备无法选择特定频率的任何小区作为同步源，第一终端设备确定 目标同步源为第二终端设备或GNSS。
需要说明的是，上述实施例并没有穷举，仅为部分实施例的示意，并且上述实施例可以单独被实施，也可以多个进行组合被实施，上述实施例仅作为示意，不作为对本公开实施例保护范围的具体限制。
可以理解的是，本公开实施例中，在sidelink通信场景下，且第一终端设备已选择中继终端设备的情况下，确定目标同步源为第二终端设备或GNSS。其中，第二终端设备可以为中继终端设备。
可以理解的是，第一终端设备在确定进行sidelink通信，且接收到用于指示同步源为基站的信息的情况下，确定目标同步源为第二终端设备或GNSS。
其中，第一终端设备确定进行sidelink通信，第一终端设备可以为远端终端设备或者还可以为中继终端设备，在第一终端设备为中继终端设备的情况下，可以直接从基站获取指示同步源为基站的信息，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取用于指示同步源为基站的信息的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12(system information block12，系统信息块12)，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
可以理解的是，响应于第一终端设备无法选择任何小区作为同步源的情况下，第一终端设备确定目标同步源为第二终端设备或GNSS。
其中，第一终端设备可以基于基站指示确定同步源为基站，选择对应的小区作为同步源。
本公开实施例中，响应于接收到用于指示同步源为基站的信息，且第一终端设备无法选择任何对应的小区作为同步源的情况下，第一终端设备确定目标同步源为第二终端设备或GNSS。
基于此，第一终端设备在进行sidelink通信时，需要选择小区作为同步源，若无法选择任何小区作为同步源，则可以确定目标同步源为第二终端设备或GNSS。
在一些实施例中，示例性的，第一终端设备无法检测到任何小区的信号，则第一终端设备确定无法选择任何小区作为同步源。
本公开实施例中，第一终端设备在无法检测到任何小区的信号的情况下，确定第一终端设备无法选择任何小区作为同步源。其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
可以理解的是，第一终端设备在确定进行sidelink通信，且接收到用于指示特定频率的同步源为基站的信息的情况下，确定目标同步源为第二终端设备或GNSS。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示特定频率的同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示特定频率的同步源为基站的信息。
在一些实施例中，响应于第一终端设备与第二终端设备同步，第一终端设备确定与小区保持同步。其中，第一终端设备与第二终端设备同步，可以为第一终端设备选择目标同步源为第二终端设备，以实现与第二终端设备同步。
本公开实施例中，第一终端设备在第一终端设备与第二终端设备同步的情况下，确定与小区保持同步，其中，小区可以为第一终端设备能够接收到信号的小区，或者还可以为第二终端设备的服务小区。
通过实施本公开实施例，第一终端设备确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图3，图3是本公开实施例提供的另一种同步源选择方法的流程图。
如图3所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S31：响应于第一终端设备已选择中继终端设备进行sidelink通信，第一终端设备确定目标同步源 为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备已选择中继终端设备进行sidelink通信的情况下，确定目标同步源为第二终端设备或GNSS；其中第二终端设备可以为中继终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
通过实施本公开实施例，第一终端设备响应于第一终端设备确定进行sidelink通信，且第一终端设备已选择中继终端设备，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图4，图4是本公开实施例提供的又一种同步源选择方法的流程图。
如图4所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S41：响应于接收到用于指示同步源为基站的信息，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备可以为远端终端设备或者还可以为中继终端设备，在第一终端设备为中继终端设备的情况下，可以直接从基站获取指示同步源为基站的信息，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处接收到用于指示同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
通过实施本公开实施例，第一终端设备响应于第一终端设备确定进行sidelink通信，且接收到用于指示同步源为基站的信息，但第一终端设备无法选择对应的小区作为同步源，则确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图5，图5是本公开实施例提供的又一种同步源选择方法的流程图。
如图5所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S51：响应于接收到用于指示同步源为基站的信息，且第一终端设备无法选择任何小区作为同步源，第一终端确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备可以为远端终端设备或者还可以为中继终端设备，在第一终端设备为中继终端设备的情况下，可以直接从基站获取指示同步源为基站的信息；在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
其中，第一终端设备可以基于基站指示确定同步源为基站，选择对应的小区作为同步源。
本公开实施例中，第一终端设备在进行sidelink通信时，需要选择小区作为同步源，若无法选择任 何小区作为同步源，则可以确定目标同步源为第二终端设备或GNSS。
在一些实施例中，响应于第一终端设备无法检测到任何小区的信号，确定第一终端设备无法选择任何小区作为同步源。
本公开实施例中，第一终端设备在无法检测到任何小区的信号的情况下，确定第一终端设备无法选择任何小区作为同步源。其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
通过实施本公开实施例，第一终端设备响应于接收到用于指示同步源为基站的信息，且第一终端设备无法选择任何小区作为同步源，第一终端确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图6，图6是本公开实施例提供的又一种同步源选择方法的流程图。
如图6所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S61：响应于第一终端设备已选择中继终端设备进行sidelink通信，且接收到用于指示同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备确定进行sidelink通信已选择中继终端设备的情况下，第二终端设备可以为中继终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备已选择中继终端设备，第一终端设备可以为远端终端设备，其中，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
通过实施本公开实施例，第一终端设备响应于第一终端设备已选择中继终端设备进行sidelink通信，且接收到用于指示同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图7，图7是本公开实施例提供的又一种同步源选择方法的流程图。
如图7所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S71：响应于第一终端设备已选择中继终端设备进行sidelink通信，且接收到用于指示指示同步源为基站的信息，以及第一终端设备无法选择任何小区作为同步源，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备确定进行sidelink通信已选择中继终端设备的情况下，第二终端设备可以为中继终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备已选择中继终端设备，第一终端设备可以为远端终端设备，其中，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
其中，第一终端设备可以基于基站指示确定同步源为基站，选择小区作为同步源。
本公开实施例中，第一终端设备在进行sidelink通信时，需要选择小区作为同步源，若无法选择任何小区作为同步源，则可以确定目标同步源为第二终端设备或GNSS。
在一些实施例中，第一终端设备响应于第一终端设备无法检测到任何小区的信号，确定第一终端设备无法选择任何小区作为同步源。
本公开实施例中，第一终端设备在无法检测到任何小区的信号的情况下，确定第一终端设备无法选择任何小区作为同步源。其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
通过实施本公开实施例，第一终端设备响应于第一终端设备已选择中继终端设备进行sidelink通信，且接收到用于指示指示同步源为基站的信息，以及第一终端设备无法选择任何小区作为同步源，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图8，图8是本公开实施例提供的又一种同步源选择方法的流程图。
如图8所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S81：响应于接收到用于指示特定频率的同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备可以为远端终端设备或者还可以为中继终端设备，在第一终端设备为中继终端设备的情况下，可以直接从基站获取指示特定频率的同步源为基站的信息，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示特定频率的同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示特定频率的同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示特定频率的同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示特定频率的同步源为基站的信息。
通过实施本公开实施例，第一终端设备响应于接收到用于指示特定频率的同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图9，图9是本公开实施例提供的又一种同步源选择方法的流程图。
如图9所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S91：响应于接收到用于指示特定频率的同步源为基站的信息，且第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备可以为远端终端设备或者还可以为中继终端设备，在第一终端设备为中继终端设备的情况下，可以直接从基站获取指示同步源为基站的信息，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示特定频率的同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示同步源为基站的信息。
其中，第一终端设备可以基于基站指示确定特定频率的同步源为基站，选择特定频率的小区作为同步源。
本公开实施例中，第一终端设备在进行sidelink通信时，需要选择特定频率的小区作为同步源，若无法选择特定频率的任何小区作为同步源，则可以确定目标同步源为第二终端设备或GNSS。
在一些实施例中，第一终端设备响应于第一终端设备无法检测到任何小区的信号，确定第一终端设备无法选择任何小区作为同步源。
本公开实施例中，第一终端设备在无法检测到特定频率的任何小区的信号的情况下，确定第一终端设备无法选择特定频率的任何小区作为同步源。其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
通过实施本公开实施例，第一终端设备响应于接收到用于指示特定频率的同步源为基站的信息，且第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图10，图10是本公开实施例提供的又一种同步源选择方法的流程图。
如图10所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S101：响应于接收到用于指示特定频率的同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备确定进行sidelink通信已选择中继终端设备的情况下，第二终端设备可以为中继终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述，此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备已选择中继终端设备，第一终端设备可以为远端终端设备，其中，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示特定频率的同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示特定频率的同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示特定频率的同步源为基站的信息。
通过实施本公开实施例，第一终端设备响应于第一终端设备接收到用于指示特定频率的同步源为基站的信息，第一终端设备确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图11，图11是本公开实施例提供的又一种同步源选择方法的流程图。
如图11所示，该方法由第一终端设备执行，该方法可以包括但不限于如下步骤：
S111：响应于接收到用于指示特定频率的同步源为基站，以及第一终端设备无法选择特定频率的任何小区作为同步源，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。
本公开实施例中，第一终端设备确定进行sidelink通信已选择中继终端设备的情况下，第二终端设备可以为中继终端设备。
其中，第一终端设备确定第二终端设备为在网终端设备的方法，可以参见上述实施例中的相关描述， 此处不再赘述。
其中，第一终端设备确定进行sidelink通信，第一终端设备已选择中继终端设备，第一终端设备可以为远端终端设备，其中，在第一终端设备为远端终端设备的情况下，处于连接态的第一终端设备可以直接从基站获取指示特定频率的同步源为基站的信息，处于非连接态的第一终端设备可以从中继终端设备处获取基站指示特定频率的同步源为基站的信息。
在一些实施例中，第一终端设备接收基站发送的SIB12，或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站；根据SIB12或RRC重配消息，确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的SIB12，根据SIB12确定接收到用于指示特定频率的同步源为基站的信息。
本公开实施例中，第一终端设备接收基站发送的RRC重配消息，根据RRC重配消息确定接收到用于指示特定频率的同步源为基站的信息。
其中，第一终端设备可以基于基站指示确定特定频率的同步源为基站，选择特定频率的小区作为同步源。
本公开实施例中，第一终端设备在进行sidelink通信时，需要选择特定频率的小区作为同步源，若无法选择特定频率的任何小区作为同步源，则可以确定目标同步源为第二终端设备或GNSS。
在一些实施例中，第一终端设备响应于第一终端设备无法检测到任何小区的信号，确定第一终端设备无法选择任何小区作为同步源。
本公开实施例中，第一终端设备在无法检测到特定频率的任何小区的信号的情况下，确定第一终端设备无法选择特定频率的任何小区作为同步源。其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
通过实施本公开实施例，第一终端设备响应于接收到用于指示特定频率的同步源为基站，以及第一终端设备无法选择特定频率的对应的小区作为同步源，确定目标同步源为第二终端设备或GNSS，其中，第二终端设备为在网终端设备。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图12，图12是本公开实施例提供的又一种同步源选择方法的流程图。
如图12所示，该方法由第二终端设备执行，该方法可以包括但不限于如下步骤：
S121：向用于进行sidelink通信的第一终端设备发送指示信息，其中，指示信息用于指示第二终端设备为在网终端设备。
本公开实施例中，第二终端设备可以向第一终端设备发送指示信息，其中，指示信息用于指示第二终端设备为在网终端设备。
在一些实施例中，第二终端设备还可以发送信息以指示第一终端设备确定目标同步源，其中该目标同步源为第二终端设备或GNSS。
基于此，指示信息可以用于第一终端设备确定第二终端设备为在网终端设备，且在第一终端设备确定进行sidelink通信的情况下，确定目标同步源为第二终端设备或GNSS。
通过实施本公开实施例，第二终端设备向第一终端设备发送指示信息，其中，指示信息用于指示第二终端设备处于网络覆盖范围内，指示信息用于第一终端设备确定第二终端设备为在网终端设备，且在第一终端设备确定进行sidelink通信的情况下，确定目标同步源为第二终端设备或GNSS。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
请参见图13，图13是本公开实施例提供的又一种同步源选择方法的流程图。
如图13所示，该方法由基站执行，该方法可以包括但不限于如下步骤：
S131：向第一终端设备发送用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息。
基站可以向第一终端设备发送消息，消息指示同步源为基站，或特定频率的同步源。
示例性的，该消息可以为SIB12或RRC重配消息。
示例性的，该消息用于指示同步源为基站，或是特定频率的同步源为基站。
其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
在一些实现方式中，响应于第一终端设备已选择中继终端设备，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于该消息指示同步源为基站，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于第一终端设备无法选择任何小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于接收到用于指示同步源为基站的信息，且第一终端设备无法选择任何对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于接收到用于指示特定频率的同步源为基站的信息，且第一终端设备无法选择对应的小区作为同步源，确定目标同步源为第二终端设备或GNSS；或，响应于第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于所述消息指示特定频率的同步源为基站，以及第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS；或，响应于第一终端已选择中继终端设备作为同步源，且接收到用于指示特定频率的同步源为基站的信息，以及第一终端设备无法选择特定频率的对应的小区作为同步源，第一终端设备确定目标同步源为第二终端设备或GNSS。
需要说明的是，上述实施例并没有穷举，仅为部分实施例的示意，并且上述实施例可以单独被实施，也可以多个进行组合被实施，上述实施例仅作为示意，不作为对本公开实施例保护范围的具体限制。
基于此，SIB12或RRC重配消息可以用于第一终端设备确定第一基站指示同步源为基站，且在无法选择任何小区作为同步源的情况下，确定目标同步源为第二终端设备或GNSS。
其中，小区可以为提供SIB12或RRC重配消息的小区，也可以为处于sidelink通信频率上的小区，也可以为任何小区。
在一些实施例中，第一基站还可以向第一终端设备发送SIB12或RRC重配消息，其中，SIB12或RRC重配消息用于指示特定频率的同步源为基站。
基于此，SIB12或RRC重配消息可以用于第一终端设备确定第一基站指示特定频率的同步源为基站，且在无法选择任何小区作为同步源的情况下，确定目标同步源为第二终端设备或GNSS。
通过实施本公开实施例，第一基站向第一终端设备发送SIB12或RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站，SIB12或RRC重配消息用于第一终端设备确定第一基站指示同步源为基站，且在无法选择任何小区作为同步源的情况下，确定目标同步源为第二终端设备或GNSS。由此，第一终端设备可以在进行sidelink通信的过程中，与为在网终端设备的第二终端设备或GNSS保持同步，能够避免sidelink通信失败。
上述本公开提供的实施例中，分别从第一终端设备、第二终端设备和基站的角度对本公开实施例提供的方法进行了介绍。
请参见图14，为本公开实施例提供的一种通信装置1的结构示意图。图14所示的通信装置1可包括收发模块11和处理模块12。收发模块可包括发送模块和/或接收模块，发送模块用于实现发送功能，接收模块用于实现接收功能，收发模块可以实现发送功能和/或接收功能。
通信装置1，被配置在第一终端设备：
该装置，包括：处理模块12。
处理模块12，被配置为确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。
在一些实施例中，处理模块12，还被配置为响应于满足以下至少一种条件，确定进行sidelink通信的目标同步源：
所述第一终端设备已选择中继终端设备；
接收到用于指示同步源为基站的信息；
所述第一终端设备无法选择任何小区作为同步源；
接收到用于指示特定频率的同步源为基站的信息；
所述第一终端设备无法选择特定频率的任何小区作为同步源。
在一些实施例中，如图14所示，该装置还包括：收发模块11。
收发模块11，被配置为接收第二终端设备发送的指示信息，其中，指示信息用于指示第二终端设备处于网络覆盖范围内。
处理模块12，还被配置为根据指示信息，确定第二终端设备为在网终端设备。
在一些实施例中，第二终端设备为中继终端设备。
在一些实施例中，处理模块12，还被配置为响应于第一终端设备无法检测到任何小区的信号，确定第一终端设备无法选择任何小区作为同步源。
在一些实施例中，收发模块11，还被配置为接收基站发送的系统信号块SIB12，或无线资源控制 RRC重配消息，其中，SIB12或RRC重配消息用于指示同步源为基站。
在一些实施例中，收发模块11，还被配置为接收基站发送的系统信号块SIB12，或无线资源控制RRC重配消息，其中，SIB12或RRC重配消息用于指示特定频率的同步源为基站。
在一些实施例中，处理模块12，还被配置为响应于第一终端设备与第二终端设备同步，确定与小区保持同步。
在一些实施例中，小区为第二终端设备的服务小区。
通信装置1，被配置在第二终端设备：
该装置，包括：收发模块11。
收发模块11，被配置为向第一终端设备发送指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内，所述指示信息用于所述第一终端设备确定所述第二终端设备为在网终端设备。
通信装置1，被配置在基站：
该装置，包括：收发模块11。
收发模块11，被配置为向第一终端设备发送用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息，其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
关于上述实施例中的通信装置1，其中各个模块执行操作的具体方式已经在有关该方法的实施例中进行了详细描述，此处将不做详细阐述说明。
本公开上述实施例中提供的通信装置1，与上面一些实施例中提供的同步源选择方法取得相同或相似的有益效果，此处不再赘述。
请参见图15，图15是本公开实施例提供的另一种通信装置1000的结构示意图。通信装置1000可以是终端设备，也可以是网络侧设备，也可以是支持终端设备实现上述方法的芯片、芯片系统、或处理器等，还可以是支持网络侧设备实现上述方法的芯片、芯片系统、或处理器等。该通信装置1000可用于实现上述方法实施例中描述的方法，具体可以参见上述方法实施例中的说明。
通信装置1000可以包括一个或多个处理器1001。处理器1001可以是通用处理器或者专用处理器等。例如可以是基带处理器或中央处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，网络侧设备、基带芯片，终端设备、终端设备芯片，DU或CU等)进行控制，执行计算机程序，处理计算机程序的数据。
可选的，通信装置1000中还可以包括一个或多个存储器1002，其上可以存有计算机程序1004，存储器1002执行所述计算机程序1004，以使得通信装置1000执行上述方法实施例中描述的方法。可选的，所述存储器1002中还可以存储有数据。通信装置1000和存储器1002可以单独设置，也可以集成在一起。
可选的，通信装置1000还可以包括收发器1005、天线1006。收发器1005可以称为收发单元、收发机、或收发电路等，用于实现收发功能。收发器1005可以包括接收器和发送器，接收器可以称为接收机或接收电路等，用于实现接收功能；发送器可以称为发送机或发送电路等，用于实现发送功能。
可选的，通信装置1000中还可以包括一个或多个接口电路1007。接口电路1007用于接收代码指令并传输至处理器1001。处理器1001运行所述代码指令以使通信装置1000执行上述方法实施例中描述的方法。
通信装置1000为第一终端设备：处理器1001用于执行图2中的S21：图3中的S31：图4中的S41；图5中的S51；图6中的S62；图7中的S71；图8中的S81；图9中的S91；图10中的S101；图11中的S111。
通信装置1000为第二终端设备：收发器1005用于执行图12中的S121。
通信装置1000为基站：收发器1005用于执行图13中的S131。
在一种实现方式中，处理器1001中可以包括用于实现接收和发送功能的收发器。例如该收发器可以是收发电路，或者是接口，或者是接口电路。用于实现接收和发送功能的收发电路、接口或接口电路可以是分开的，也可以集成在一起。上述收发电路、接口或接口电路可以用于代码/数据的读写，或者，上述收发电路、接口或接口电路可以用于信号的传输或传递。
在一种实现方式中，处理器1001可以存有计算机程序1003，计算机程序1003在处理器1001上运行，可使得通信装置1000执行上述方法实施例中描述的方法。计算机程序1003可能固化在处理器1001中，该种情况下，处理器1001可能由硬件实现。
在一种实现方式中，通信装置1000可以包括电路，所述电路可以实现前述方法实施例中发送或接 收或者通信的功能。本公开中描述的处理器和收发器可实现在集成电路(integrated circuit，IC)、模拟IC、射频集成电路RFIC、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)、印刷电路板(printed circuit board，PCB)、电子设备等上。该处理器和收发器也可以用各种IC工艺技术来制造，例如互补金属氧化物半导体(complementary metal oxide semiconductor，CMOS)、N型金属氧化物半导体(nMetal-oxide-semiconductor，NMOS)、P型金属氧化物半导体(positive channel metal oxide semiconductor，PMOS)、双极结型晶体管(bipolar junction transistor，BJT)、双极CMOS(BiCMOS)、硅锗(SiGe)、砷化镓(GaAs)等。
以上实施例描述中的通信装置可以是终端设备或网络侧设备，但本公开中描述的通信装置的范围并不限于此，而且通信装置的结构可以不受图15的限制。通信装置可以是独立的设备或者可以是较大设备的一部分。例如所述通信装置可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或子系统；
(2)具有一个或多个IC的集合，可选的，该IC集合也可以包括用于存储数据，计算机程序的存储部件；
(3)ASIC，例如调制解调器(Modem)；
(4)可嵌入在其他设备内的模块；
(5)接收机、终端设备、智能终端设备、蜂窝电话、无线设备、手持机、移动单元、车载设备、网络设备、云设备、人工智能设备等等；
(6)其他等等。
对于通信装置可以是芯片或芯片系统的情况，请参见图16，为本公开实施例中提供的一种芯片的结构图。
芯片1100包括处理器1101和接口1103。其中，处理器1101的数量可以是一个或多个，接口1103的数量可以是多个。
对于芯片用于实现本公开实施例中第一终端设备的功能的情况：
接口1103，用于接收代码指令并传输至所述处理器。
处理器1101，用于运行代码指令以执行如上面一些实施例所述的同步源选择方法。
对于芯片用于实现本公开实施例中第二终端设备的功能的情况：
接口1103，用于接收代码指令并传输至所述处理器。
处理器1101，用于运行代码指令以执行如上面一些实施例所述的同步源选择方法。
对于芯片用于实现本公开实施例中基站的功能的情况：
接口1103，用于接收代码指令并传输至所述处理器。
处理器1101，用于运行代码指令以执行如上面一些实施例所述的同步源选择方法。
可选的，芯片1100还包括存储器1102，存储器1102用于存储必要的计算机程序和数据。
本领域技术人员还可以了解到本公开实施例列出的各种说明性逻辑块(illustrative logical block)和步骤(step)可以通过电子硬件、电脑软件，或两者的结合进行实现。这样的功能是通过硬件还是软件来实现取决于特定的应用和整个系统的设计要求。本领域技术人员可以对于每种特定的应用，可以使用各种方法实现所述的功能，但这种实现不应被理解为超出本公开实施例保护的范围。
本公开实施例还提供一种同步源选择系统，该系统包括前述图14实施例中作为第一终端设备的通信装置、作为第二终端设备的通信装置和作为基站的通信装置，或者，该系统包括前述图15实施例中作为第一终端设备的通信装置、作为第二终端设备的通信装置和作为基站的通信装置。
本公开还提供一种可读存储介质，其上存储有指令，该指令被计算机执行时实现上述任一方法实施例的功能。
本公开还提供一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序。在计算机上加载和执行所述计算机程序时，全部或部分地产生按照本公开实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机程序可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁 性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以理解：本公开中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本公开实施例的范围，也表示先后顺序。
本公开中的至少一个还可以描述为一个或多个，多个可以是两个、三个、四个或者更多个，本公开不做限制。在本公开实施例中，对于一种技术特征，通过“第一”、“第二”、“第三”、“A”、“B”、“C”和“D”等区分该种技术特征中的技术特征，该“第一”、“第二”、“第三”、“A”、“B”、“C”和“D”描述的技术特征间无先后顺序或者大小顺序。
本公开中各表所示的对应关系可以被配置，也可以是预定义的。各表中的信息的取值仅仅是举例，可以配置为其他值，本公开并不限定。在配置信息与各参数的对应关系时，并不一定要求必须配置各表中示意出的所有对应关系。例如，本公开中的表格中，某些行示出的对应关系也可以不配置。又例如，可以基于上述表格做适当的变形调整，例如，拆分，合并等等。上述各表中标题示出参数的名称也可以采用通信装置可理解的其他名称，其参数的取值或表示方式也可以通信装置可理解的其他取值或表示方式。上述各表在实现时，也可以采用其他的数据结构，例如可以采用数组、队列、容器、栈、线性表、指针、链表、树、图、结构体、类、堆、散列表或哈希表等。
本公开中的预定义可以理解为定义、预先定义、存储、预存储、预协商、预配置、固化、或预烧制。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本公开的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (17)

  1. 一种同步源选择方法，其特征在于，所述方法由第一终端设备执行，包括：
    确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    响应于满足以下至少一种条件，确定进行sidelink通信的目标同步源：
    所述第一终端设备已选择中继终端设备；
    接收到用于指示同步源为基站的信息；
    所述第一终端设备无法选择任何小区作为同步源；
    接收到用于指示特定频率的同步源为基站的信息；
    所述第一终端设备无法选择特定频率的任何小区作为同步源。
  3. 如权利要求1或2所述的方法，其特征在于，所述方法还包括：
    接收所述第二终端设备发送的指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内；
    根据所述指示信息，确定所述第二终端设备为在网终端设备。
  4. 如权利要求2所述的方法，其特征在于，所述第二终端设备为所述中继终端设备。
  5. 如权利要求2所述的方法，其特征在于，所述方法还包括：
    响应于所述第一终端设备无法检测到任何小区的信号，确定所述第一终端设备无法选择任何小区作为同步源。
  6. 如权利要求2所述的方法，其特征在于，所述接收到用于指示同步源为基站的信息，包括：
    接收基站发送的系统信号块SIB12，或无线资源控制RRC重配消息，其中，所述SIB12或所述RRC重配消息用于指示同步源为基站。
  7. 如权利要求2所述的方法，其特征在于，所述接收到用于指示特定频率的同步源为基站的信息，包括：
    接收基站发送的系统信号块SIB12，或无线资源控制RRC重配消息，其中，所述SIB12或所述RRC重配消息用于指示所述特定频率的同步源为基站。
  8. 如权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    响应于所述第一终端设备与所述第二终端设备同步，确定与小区保持同步。
  9. 如权利要求8所述的方法，其特征在于，所述小区为所述第二终端设备的服务小区。
  10. 一种同步源选择方法，其特征在于，所述方法由第二终端设备执行，包括：
    向第一终端设备发送指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内，所述指示信息用于所述第一终端设备确定所述第二终端设备为在网终端设备。
  11. 一种同步源选择方法，其特征在于，所述方法由基站执行，包括：
    向第一终端设备发送用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息，其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
  12. 一种通信装置，其特征在于，所述装置包括：
    处理模块，被配置为确定进行侧行链路sidelink通信的目标同步源，其中，所述目标同步源为第二终端设备或全球导航卫星系统GNSS，所述第二终端设备为在网终端设备。
  13. 一种通信装置，其特征在于，所述装置包括：
    收发模块，被配置为向第一终端设备发送指示信息，其中，所述指示信息用于指示所述第二终端设备处于网络覆盖范围内，所述指示信息用于所述第一终端设备确定所述第二终端设备为在网终端设备。
  14. 一种通信装置，其特征在于，所述装置包括：
    收发模块，被配置为用于指示同步源为基站的信息或用于指示特定频率的同步源为基站的信息，其中，所述用于指示同步源为基站的信息或所述用于指示特定频率的同步源为基站的信息用于所述第一终端设备确定进行sidelink通信的目标同步源，所述目标同步源为第二终端设备或GNSS，所述第二终端设备为在网终端设备，所述第二终端设备为在网终端设备。
  15. 一种通信装置，其特征在于，所述装置包括处理器和存储器，所述存储器中存储有计算机程序，所述处理器执行所述存储器中存储的计算机程序，以使所述装置执行如权利要求1至9中任一项所述的方法，或所述处理器执行所述存储器中存储的计算机程序，以使所述装置执行如权利要求10所述的方法，或所述处理器执行所述存储器中存储的计算机程序，以使所述装置执行如权利要求11所述的方法。
  16. 一种通信装置，其特征在于，包括：处理器和接口电路；
    所述接口电路，用于接收代码指令并传输至所述处理器；
    所述处理器，用于运行所述代码指令以执行如权利要求1至9中任一项所述的方法，或用于运行所述代码指令以执行如权利要求10所述的方法，或用于运行所述代码指令以执行如权利要求11所述的方法。
  17. 一种计算机可读存储介质，用于存储有指令，当所述指令被执行时，使如权利要求1至9中任一项所述的方法被实现，或当所述指令被执行时，使如权利要求10所述的方法被实现，或当所述指令被执行时，使如权利要求11所述的方法被实现。
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