WO2021159418A1 - 一种确定侧链路时长的方法及其装置 - Google Patents

一种确定侧链路时长的方法及其装置 Download PDF

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Publication number
WO2021159418A1
WO2021159418A1 PCT/CN2020/075151 CN2020075151W WO2021159418A1 WO 2021159418 A1 WO2021159418 A1 WO 2021159418A1 CN 2020075151 W CN2020075151 W CN 2020075151W WO 2021159418 A1 WO2021159418 A1 WO 2021159418A1
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WIPO (PCT)
Prior art keywords
duration
handover
subcarrier spacing
configuration coefficient
terminal device
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PCT/CN2020/075151
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English (en)
French (fr)
Inventor
何畅
夏金环
董蕾
卢磊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2020/075151 priority Critical patent/WO2021159418A1/zh
Priority to CN202080094724.0A priority patent/CN115004809A/zh
Publication of WO2021159418A1 publication Critical patent/WO2021159418A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • This application relates to the field of communication technologies, and in particular, to a method and device for determining the duration of a side link.
  • Intelligent travel is based on the intelligent transportation system centered on assisted driving and autonomous driving with people, vehicles, and roads as the core.
  • the introduction of new scenarios and new requirements will promote the Internet of Vehicles from the traditional Internet of Vehicles that only supports in-vehicle information services to the support of vehicles.
  • terminals communicate with each other through sidelinks (SL).
  • the sidelink includes the physical sidelink control channel (PSCCH) and the physical sidelink share channel (PSSCH).
  • PSCCH physical sidelink control channel
  • PSSCH physical sidelink share channel
  • SCI sidelink control information
  • PSSCH is used to carry data for sidelink communication.
  • the terminal In order to receive the PSSCH, the terminal needs to receive the PSCCH first.
  • a terminal In order to send data to another terminal, it needs to send a PSCCH and a PSSCH to the other terminal, and the PSSCH is used to carry the data that the terminal needs to send to the other terminal.
  • the terminal After the terminal receives the downlink control information (DCI) from the base station, it needs a certain amount of time to prepare the PSSCH data to be sent to another terminal, and the required time may be referred to as the side link preparation time. By determining the side link preparation time, it is possible to prevent the terminal from sending the PSSCH to another terminal before the PSSCH data is ready.
  • DCI downlink control information
  • the embodiment of the application provides a method and device for determining the duration of a side link, which can be applied to the Internet of Vehicles, such as vehicle-to-everything (V2X) communication, and long-term evolution-vehicle (long term evolution-vehicle) communication between vehicles, LTE-V), vehicle-to-vehicle (V2V) communication, etc., or can be used in intelligent driving, intelligent networked vehicles and other fields.
  • V2X vehicle-to-everything
  • V2V long-term evolution-vehicle
  • LTE-V long term evolution-vehicle
  • V2V vehicle-to-vehicle
  • an embodiment of the present application provides a method for determining the duration of a side link.
  • the method includes: a terminal device receives first downlink control information DCI from a network device, where the first DCI includes indication information; and according to the physical side One of the configuration coefficient of the subcarrier spacing of the link control channel PSCCH, the configuration coefficient of the subcarrier spacing of the physical side link shared channel PSSCH, or the configuration coefficient of the subcarrier spacing of the physical downlink control channel PDCCH, and the indication information, Determine the side link preparation time; the PDCCH is used to carry the first DCI; wherein the indication information may include at least one of the following: resource allocation information, the resource allocation information is used to indicate the time-frequency resources that carry the PSCCH and the time-frequency resources that carry the PSCCH PSSCH time-frequency resource; handover duration, which is used to indicate the time required for handover of the radio access technology.
  • the side link preparation time can be determined. Further, the terminal device may send the PSSCH to another terminal device in the case that the duration of receiving the first DCI is greater than or equal to the preparation duration of the side link. In this way, it is possible to avoid sending the PSSCH to another terminal device when the time period for receiving the first DCI is less than the side link preparation time period, thereby helping to avoid resource waste.
  • the terminal equipment determines the side link according to one of the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, and the indication information.
  • the specific implementation manner of the preparation time may be: in the case that the handover condition is not met, according to one of the configuration coefficients of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, And the resource allocation information determines the side link preparation time.
  • the terminal device when the handover conditions are not met (for example, the terminal device supports only one wireless access technology), the terminal device can use the PSCCH sub-carrier spacing configuration coefficient, PSSCH sub-carrier spacing configuration coefficient or One item in the configuration coefficient of the sub-carrier spacing of the PDCCH and the resource allocation information determine the side link preparation time.
  • the method may further include: if the scrambling information of the first DCI is the same as the scrambling information of the second DCI, the terminal device determines that the aforementioned handover condition is not satisfied, wherein the receiving of the second DCI The time is before the reception time of the first DCI.
  • the terminal equipment when the handover condition is not met, the terminal equipment according to one of the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, And the specific implementation manner for determining the side link preparation time by the resource allocation information may be: determining the minimum configuration from the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient Coefficient; determine the time-frequency resource carrying the PSCCH and the interval duration of the time-frequency resource carrying the PSSCH in the time domain; determine the side link preparation duration according to the minimum configuration coefficient and the interval duration.
  • the time required for a terminal device to prepare PSSCH data is related to the hardware processing capability of the terminal device, and the hardware processing capabilities of different terminal devices are different. Therefore, by determining a longer side link preparation time, it is beneficial for terminal devices with different hardware processing capabilities to be ready to send when the time period for receiving the first DCI is greater than or equal to the side link preparation time PSSCH data to another terminal device.
  • the terminal equipment determines the side link according to one of the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, and the indication information.
  • the specific implementation manner of the preparation time may be: when the handover condition is met and the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, according to the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficient of the subcarrier spacing of the PSSCH or the configuration coefficient of the subcarrier spacing of the PDCCH, and the aforementioned handover duration determine the side link preparation duration.
  • the terminal equipment can be based on the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficients of the sub-carrier spacing of the PSSCH or the configuration coefficients of the sub-carrier spacing of the PDCCH, and the handover duration determine the side link preparation duration.
  • the terminal equipment determines the side link according to one of the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, and the indication information.
  • the specific implementation manner of the preparation time may be: when the handover condition is met and the priority of the radio access technology after the handover is higher than the priority of the radio access technology before the handover, according to the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficient of the subcarrier spacing of the PSSCH or the configuration coefficient of the subcarrier spacing of the PDCCH, the foregoing resource allocation information and the foregoing switching duration determine the side link preparation duration.
  • the terminal equipment in the case that the handover conditions are met and the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, the terminal equipment can be based on the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficients of the subcarrier spacing of the PSSCH or the configuration coefficients of the subcarrier spacing of the PDCCH, the resource allocation information and the handover duration determine the side link preparation duration.
  • the terminal equipment determines the aforementioned resource allocation information and the aforementioned switching duration according to one of the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient.
  • the specific implementation of the side link preparation time may be: determining the smallest configuration coefficient from the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH; The time-frequency resource of the PSCCH and the interval duration of the time-frequency resource carrying the PSSCH in the time domain; according to the minimum configuration coefficient, the interval duration and the handover duration, the side link preparation duration is determined.
  • the method may further include: the terminal device sends the capability information of the terminal device to the network device, and the capability information of the terminal device is used to determine the handover duration.
  • the embodiments of the present application provide another method for determining the side link duration.
  • the method includes: a network device receives capability information of the terminal device from a terminal device; determining the handover duration according to the capability information of the terminal device, The handover duration is used to indicate the duration required for the handover of the radio access technology; when it is determined that the terminal device satisfies the conditions required for the handover of the radio access technology, the first downlink control information DCI is sent to the terminal device.
  • the first DCI includes indication information, and the indication information includes the switching duration; the switching duration may also be used to determine the side link preparation duration of the terminal device.
  • the network device can determine the switching duration according to the capability information of the terminal device, and the switching duration can be used to determine the side link preparation duration.
  • the indication information may also include resource allocation information, and the resource allocation information is used for Indicate the time-frequency resource carrying the physical side link control channel PSCCH and the time-frequency resource carrying the physical side link shared channel PSSCH, and the resource allocation information is also used to determine the side link preparation time of the aforementioned terminal device.
  • an embodiment of the present application provides a communication device that can implement part or all of the functions of the terminal device in the method described in the first aspect.
  • the functions in the embodiments may also have the functions of independently implementing any of the embodiments in this application.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned 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 corresponding functions in the foregoing method.
  • the transceiver module is used to support communication between the communication device and other equipment.
  • the communication device may further include a storage module for coupling with the transceiver module and the processing module, which stores computer programs and data necessary for the communication device.
  • the communication device includes:
  • a transceiver module configured to receive a first DCI from a network device, where the first DCI includes indication information
  • the processing module is used to determine the side link preparation time according to one of the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient or PDCCH subcarrier spacing configuration coefficient, and the indication information;
  • the PDCCH is used to carry the first DCI; wherein the indication information may include at least one of the following: resource allocation information, the resource allocation information is used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH; the handover duration , The handover duration is used to indicate the duration required for the handover of the radio access technology.
  • the processing module may be a processor
  • the transceiver module may be a transceiver or a communication interface
  • the storage module may be a memory
  • the communication device includes:
  • a transceiver configured to receive a first DCI from a network device, where the first DCI includes indication information
  • the processor is configured to determine the side link preparation time according to one of the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient, and the indication information;
  • the PDCCH is used to carry the first DCI; wherein the indication information may include at least one of the following: resource allocation information, the resource allocation information is used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH; the handover duration , The handover duration is used to indicate the duration required for the handover of the radio access technology.
  • an embodiment of the present application provides another communication device that has some or all of the functions of the network device in the method example described in the second aspect. Or the functions in all the embodiments may also have the function of independently implementing any of the embodiments in this application.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned 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 corresponding functions in the foregoing method.
  • the transceiver module is used to support the communication between the communication device and other equipment.
  • the communication device may further include a storage module for coupling with the transceiver module and the processing module, which stores computer programs and data necessary for the communication device.
  • the communication device includes:
  • the transceiver module is used to receive the capability information of the terminal device from the terminal device;
  • the processing module is used to determine the handover duration according to the capability information of the terminal device, and the handover duration is used to indicate the duration required for the handover of the radio access technology;
  • the transceiver module is further configured to send a first DCI to the terminal device when it is determined that the terminal device satisfies the conditions required for handover of the radio access technology, the first DCI includes indication information, and the indication information includes the handover duration ;
  • the switching duration can also be used to determine the side link preparation duration of the terminal device.
  • the processing module may be a processor
  • the transceiver module may be a transceiver or a communication interface
  • the storage module may be a memory
  • the communication device includes:
  • the transceiver is used to receive the capability information of the terminal device from the terminal device;
  • the processor is configured to determine the handover duration according to the capability information of the terminal device, where the handover duration is used to indicate the duration required for the handover of the radio access technology;
  • the transceiver is further configured to send a first DCI to the terminal device when it is determined that the terminal device meets the conditions required for handover of the radio access technology, where the first DCI includes indication information, and the indication information includes the handover duration;
  • the switching duration can also be used to determine the side link preparation duration of the terminal device.
  • an embodiment of the present application provides a communication device, which includes a processor, and when the processor invokes a computer program in a memory, the method described in the first aspect is executed.
  • an embodiment of the present application provides a communication device, which includes a processor, and when the processor invokes a computer program in a memory, the method described in the second aspect is executed.
  • an embodiment of the present application provides a communication device, the communication device includes a processor and a memory, and a computer program is stored in the memory; the processor executes the computer program stored in the memory to make the communication device execute The method described in the first aspect above.
  • an embodiment of the present application provides a communication device.
  • the communication device includes a processor and a memory, and a computer program is stored in the memory; the processor executes the computer program stored in the memory to make the communication device execute The method described in the second aspect above.
  • an embodiment of the present application provides a communication device that includes a processor and an interface circuit, 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 make the The device executes the method described in the first aspect above.
  • an embodiment of the present application provides a communication device that includes a processor and an interface circuit, the interface circuit is configured to receive code instructions and transmit them to the processor, and the processor is configured to run the code instructions to enable the The device executes the method described in the second aspect above.
  • an embodiment of the present application provides a system for determining the duration of a side link.
  • the system includes the communication device described in the third aspect and the communication device described in the fourth aspect, or the system includes the communication device described in the fifth aspect.
  • an embodiment of the present invention provides a readable storage medium for storing instructions used by the above-mentioned terminal device, and when the instructions are executed, the terminal device is caused to execute the method described in the above-mentioned first aspect .
  • an embodiment of the present invention provides a readable storage medium for storing instructions used by the above-mentioned network device, and when the instructions are executed, the network device is caused to execute the method described in the above-mentioned second aspect .
  • this application also provides a computer program product including a computer program, which when running on a computer, causes the computer to execute the method described in the first aspect.
  • this application also provides a computer program product including a computer program, which when it runs on a computer, causes the computer to execute the method described in the second aspect above.
  • the present application provides a chip system that includes at least one processor and an interface, and is used to support the terminal device to implement the functions involved in the first aspect, for example, to determine or process the data involved in the above method And at least one of the information.
  • the chip system further includes a memory, and the memory is used to store necessary computer programs and data for the terminal device.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • the present application provides a chip system that includes at least one processor and an interface, and is used to support network devices to implement the functions involved in the second aspect, for example, to determine or process data involved in the above methods And at least one of the information.
  • the chip system further includes a memory, and the memory is used to store computer programs and data necessary for the network device.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for determining the duration of a side link according to an embodiment of the present application
  • FIG. 3a is a schematic flowchart of another method for determining the duration of a side link according to an embodiment of the present application
  • FIG. 3b is a schematic diagram of four multiplexing relationships between a time-frequency resource carrying PSCCH and a time-frequency resource carrying PSSCH according to an embodiment of the present application;
  • FIG. 4 is a schematic flowchart of another method for determining the duration of a side link according to an embodiment of the present application
  • FIG. 5 is a schematic flowchart of another method for determining the duration of a side link according to an embodiment of the present application
  • FIG. 6 is a schematic flowchart of another method for determining the duration of a side link according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a chip provided by an embodiment of the present application.
  • DCI Downlink control information
  • the DCI is carried by the physical downlink control channel (PDCCH), and the DCI may include uplink and downlink resource allocation, hybrid automatic repeat request (HARQ) information, power control, and so on.
  • PDCCH is a physical channel used to carry downlink scheduling information.
  • Scrambling is a processing method of digital signals. It uses scrambling code to XOR with the original signal to obtain a new signal. Usually the role of uplink physical channel scrambling is to distinguish different terminals, and downlink scrambling can distinguish between cells and channels. Among them, the scrambling code can be used to scramble and descramble the original signal.
  • the scrambling code may scramble the downlink control information (DCI), or may also be referred to as scrambling the PDCCH.
  • the scrambling of the DCI may specifically refer to scrambling the cyclic redundancy check (cyclic redundancy check, CRC) field of the DCI.
  • the terminal descrambling the received DCI specifically means that the terminal descrambles the CRC field of the DCI using a corresponding type of scrambling code to determine the format or type of the DCI.
  • the scrambling code can include but is not limited to: cell radio network temporary identifier (C-RNTI), temporary cell radio network temporary identifier (TC-RNTI) and random access wireless network temporary Identity (random access radio network temporary identifier, RA-RNTI).
  • C-RNTI cell radio network temporary identifier
  • TC-RNTI temporary cell radio network temporary identifier
  • RA-RNTI random access wireless network temporary Identity
  • the terminal If the terminal is in the radio resource control connected (RRC-connected) state, it indicates that the terminal has been allocated to the C-RNTI, and the terminal needs to carry the C-RNTI when initiating a random access request to the network device. If the terminal is in the RRC idle state or the RRC inactive state, it means that the terminal has not been allocated to the C-RNTI. If the terminal requests an RRC connection, the network equipment may assign a temporary C-RNTI to the terminal in the subsequent response information, which is recorded as TC-RNTI. After the terminal is successfully accessed randomly, the TC-RNTI can be converted to C-RNTI. .
  • RRC-connected radio resource control connected
  • the generation of RA-RNTI is related to the time-frequency resources used by the terminal to send the preamble. For example, when terminal A and terminal B use the same random access channel time-frequency resource to initiate random access, the corresponding RA-RNTI is the same.
  • V2X Vehicle-to-everything
  • V2X communication refers to the communication between the vehicle and the outside world.
  • V2X communication can include but is not limited to: vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-vehicle (V2P) communication.
  • V2V vehicle-to-vehicle
  • V2P vehicle-to-pedestrian
  • V2P vehicle-to-vehicle
  • V2P vehicle-to-vehicle
  • V2P vehicle-to-vehicle
  • V2I infrastructure
  • V2N vehicle to network
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the application.
  • the communication system may include, but is not limited to, one network device and one terminal device.
  • the number and form of the devices shown in FIG. 1 are only used as examples and do not constitute a limitation to the embodiment of the present application. In actual applications, it may include two or more Network equipment, two or more terminal equipment.
  • the communication system shown in FIG. 1 includes a network device 101 and a terminal device 102 as an example.
  • the network device 101 may be configured to send the first DCI to the terminal device 102, and the first DCI may include indication information, and the indication information may include at least one of the following: resource allocation information and handover duration.
  • the resource allocation information can be used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH;
  • the handover duration can be used to indicate the time required for the handover of the radio access technology.
  • the terminal device 102 may be based on the configuration coefficient of the sub-carrier spacing (SCS) of the PDCCH used to carry the first DCI, the configuration coefficient of the sub-carrier spacing of the PSCCH, or the configuration coefficient of the sub-carrier spacing of the PSSCH.
  • SCS sub-carrier spacing
  • the terminal device 102 After the terminal device 102 receives the first DCI, it needs a certain amount of time to prepare to send the PSSCH to another terminal device, and the required minimum duration threshold is the side link preparation duration. If the duration of receiving the first DCI is greater than or equal to the side link preparation duration, it indicates that the terminal device 102 is ready to send PSSCH data to another terminal device; if the duration of receiving the first DCI is less than the side link preparation duration The duration indicates that the terminal device 102 is not yet ready to send PSSCH data to another terminal device.
  • the terminal device 102 If the terminal device 102 is ready to send the PSSCH to another terminal, the terminal device 102 is not yet ready to send PSSCH data to the other terminal device, which will cause the other terminal to fail to receive the complete PSSCH data, and cause waste of resources . In one implementation, if the terminal device 102 is ready to send PSSCH data to another terminal, and the terminal device 102 is not yet ready to send PSSCH data to the other terminal device, the terminal device can cancel the transmission to the other terminal device. PSSCH. This wastes time-frequency resources occupied by the first DCI and the PDCCH used to carry the first DCI.
  • the terminal device 102 may send the PSSCH to another terminal device when the time length of receiving the first DCI is greater than or equal to the side link preparation time length. In this way, it is possible to avoid sending the PSSCH to another terminal device when the time period for receiving the first DCI is less than the side link preparation time period, thereby helping to avoid resource waste.
  • LTE long term evolution
  • 5G fifth generation
  • NR 5G new radio
  • side link in the embodiment of the present application may also be referred to as a side link or a through link.
  • the network device 101 in the embodiment of the present application is an entity on the network side for transmitting or receiving signals.
  • the network device 101 may be an evolved base station (evolved NodeB, eNB), a transmission reception point (TRP), a next generation base station (next generation NodeB, gNB) in an NR system, and a base station in other future mobile communication systems.
  • the embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.
  • the network equipment provided in the embodiments of the present application may be composed of a centralized unit (CU) and a distributed unit (DU), where the CU may also be called a control unit (control unit), adopting CU-DU
  • CU centralized unit
  • DU distributed unit
  • control unit control unit
  • the structure of the network equipment, such as the protocol layer of the base station, can be separated, part of the protocol layer functions are placed under the centralized control of the CU, and some or all of the protocol layer functions are distributed in the DU, and the CU is centrally controlled by the DU.
  • the terminal device 102 in the embodiment of the present application is an entity on the user side for receiving or transmitting signals, such as a mobile phone.
  • a terminal device may also be called a terminal (terminal), a user equipment (UE), a mobile station (mobile station, MS), a mobile terminal (mobile terminal, MT), and so on.
  • Terminal devices can be cars with communication functions, smart cars, mobile phones, wearable devices, tablets (Pad), computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (augmented reality (AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, smart grids Wireless terminals in the transportation safety (transportation safety), wireless terminals in the smart city (smart city), wireless terminals in the smart home (smart home), and so on.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.
  • side link transmission mode 1 and side link transmission mode 2 are used for device-to-device (D2D) communication.
  • Side link transmission mode 3 and side link transmission mode 4 are used for V2X communication.
  • the resource allocation is scheduled by the network device 101.
  • the network device 101 may send resource allocation information to the terminal device 102, and then the terminal device 102 allocates resources to another terminal device, so that the other terminal device can send information to the network device 101 through the allocated resources .
  • V2X communication a terminal device with a better signal or higher reliability may be used as the terminal device 102.
  • the first terminal device mentioned in the embodiment of the present application may refer to the terminal device 102, and the second terminal device may refer to the other terminal device.
  • FIG. 2 is a schematic flowchart of a method for determining the duration of a side link according to an embodiment of the present application.
  • the execution subject of step S201 is the first terminal device or the chip in the first terminal device
  • the execution subject of step S202 is the network device or the chip in the network device.
  • the first terminal device and the network device are used as The execution subject of the method for determining the side link duration is described as an example.
  • the method may include but is not limited to the following steps:
  • Step S201 The network device sends first downlink control information DCI to the first terminal device, where the first DCI includes indication information, and the indication information includes at least one of the following: resource allocation information, which is used to indicate the bearer physical side The time-frequency resource of the link control channel PSCCH and the time-frequency resource of the PSSCH bearing the physical side link shared channel; the switching duration, which is used to indicate the duration required for the switching of the radio access technology.
  • resource allocation information which is used to indicate the bearer physical side
  • the switching duration which is used to indicate the duration required for the switching of the radio access technology.
  • the network device sends the first DCI to the first terminal device, so that the first terminal device determines the side link preparation duration according to the indication information in the first DCI.
  • the multiplexing relationship between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH will affect the side link preparation time.
  • the network device sends the resource allocation information to the first terminal device, so that the first terminal device determines the multiplexing relationship between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH according to the resource allocation information. Therefore, in an implementation manner, the aforementioned indication information may include resource allocation information used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH.
  • the first terminal device may only support side link communication in one radio access technology (RAT), or it may support side link communication in at least two radio access technologies.
  • RAT may include, but is not limited to, LTE, NR, or other future new wireless access technologies.
  • the first terminal device may only support NR sidelink, or it may support NR sidelink and LTE sidelink.
  • the wireless access technology may be switched.
  • NR's universal user to network interface (Uu) schedules LTE sidelink, which can make the wireless access used by the first terminal device
  • the technology was switched from NR to LTE.
  • the foregoing indication information may include the switching duration.
  • the switching duration can be calculated by the network device.
  • the switching duration may be related to the hardware processing capability of the first terminal device.
  • the first terminal device may send its own hardware processing capability to the network device, and then the network device determines the handover duration based on the hardware processing capability of the first terminal device. The stronger the hardware processing capability of the first terminal device, the shorter the switching duration can be. The weaker the hardware processing capability of the first terminal device, the longer the handover time can be.
  • Step S202 The first terminal device determines the side according to one of the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or physical downlink control channel PDCCH subcarrier spacing configuration coefficient, and the indication information Link preparation duration; this PDCCH is used to carry the first DCI.
  • the first terminal device may be based on one of the PSCCH subcarrier spacing configuration coefficient, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient.
  • the instruction information determine the side link preparation time.
  • the sub-carrier spacing of a physical channel may have a one-to-one correspondence with the configuration coefficient of the sub-carrier spacing of the physical channel.
  • a physical channel such as PDCCH, PSCCH, or PSSCH
  • multiple subcarrier intervals are defined in 5G NR, and the correspondence between the subcarrier interval of the PDCCH in NR and the configuration coefficient of the subcarrier interval of the PDCCH can be as shown in Table 1.
  • the smaller the configuration coefficient of the sub-carrier spacing of the physical channel (such as PDCCH, PSCCH or PSSCH), the smaller the sub-carrier spacing of the physical channel; the larger the configuration coefficient of the sub-carrier spacing of the physical channel ,
  • the sub-carrier spacing of the physical channel can be larger.
  • the first terminal device needs to synchronize with the network device before receiving the first DCI from the network device.
  • the first terminal device may complete synchronization with the network device by receiving the synchronization signal sent by the network device.
  • the synchronization signal may be composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).
  • the synchronization signal may include a master information block (master information block, MIB).
  • MIB master information block
  • the subcarrier interval and bandwidth part (BWP) may have a corresponding relationship.
  • the first terminal device can determine the subcarrier interval of the PDCCH sent by the network device to the first terminal device by detecting the bandwidth resource indicated by the MIB, and then determine the PDCCH through the correspondence between the subcarrier interval and the configuration coefficient of the subcarrier interval The configuration coefficient of the subcarrier spacing.
  • the first terminal device may determine the bandwidth resource occupied by the PSCCH and the bandwidth resource occupied by the PSSCH to the second terminal device according to the foregoing resource allocation information. Then, the first terminal device may determine the subcarrier interval of the PSCCH and the subcarrier interval of the PSSCH according to the correspondence between the subcarrier interval and the bandwidth resource. Further, the first terminal device may determine the configuration coefficient of the subcarrier spacing of the PSCCH and the configuration coefficient of the subcarrier spacing of the PSSCH according to the correspondence between the subcarrier spacing and the configuration coefficient of the subcarrier spacing.
  • the subcarrier spacing of the physical channel will affect the preparation time of the side link.
  • the terminal equipment can use the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH
  • One of the configuration coefficients of the sub-carrier spacing and the aforementioned indication information determine the side link preparation time.
  • the switching duration will affect the side link preparation duration. If the wireless access technology does not switch, there will be no switching duration.
  • the first terminal device may determine whether the wireless access technology will change by determining whether the handover condition is satisfied. If the handover conditions are not met, the wireless access technology will not change. At this time, the first terminal device may determine the side link preparation according to one of the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient, and the aforementioned resource allocation information. duration.
  • the execution process please refer to the specific description in the embodiment shown in FIG. 3a.
  • the first terminal device may determine the side link preparation time according to one of the PSCCH subcarrier spacing configuration coefficient, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient, and the aforementioned switching time length. .
  • the execution process please refer to the specific description in the embodiment shown in FIG. 4 and FIG. 5.
  • the preparation time of the side link can be determined. Further, the first terminal device may send the PSSCH to the second terminal device when the duration of receiving the first DCI is greater than or equal to the preparation duration of the side link. In this way, it can be avoided that the PSSCH is sent to the second terminal device when the duration of receiving the first DCI is less than the preparation duration of the side link, thereby helping to avoid resource waste.
  • FIG. 3a is a schematic flowchart of another method for determining the duration of a side link provided by an embodiment of the present application.
  • One of the configuration coefficient of the sub-carrier spacing, the configuration coefficient of the sub-carrier spacing of the PSSCH, or the configuration coefficient of the sub-carrier spacing of the PDCCH, and the resource allocation information determine the side link preparation time.
  • the execution subject of step S301 is a network device or a chip in a network device
  • the execution subject of step S302 is a first terminal device or a chip in a first terminal device.
  • the network device and the first terminal device are used as
  • the execution subject of the method for determining the side link duration is described as an example.
  • the method may include but is not limited to the following steps:
  • Step S301 The network device sends a first DCI to the first terminal device.
  • the first DCI includes indication information.
  • the indication information includes resource allocation information. Time-frequency resources.
  • the network device can determine whether the first terminal device meets the conditions required for the handover of the radio access technology. If it is determined that the first terminal device does not meet the conditions required for the switching of the radio access technology, it means that the radio access technology corresponding to the first terminal device will not switch. In this case, the indication information in the first DCI sent by the network device to the first terminal device may not include the handover duration.
  • the network device can determine that the first terminal device does not meet the conditions required for the handover of the wireless access technology.
  • the network device can determine whether the subcarrier interval required by the service currently requested by the first terminal device is the same as the previous request. The sub-carrier intervals required by the services of the two are the same. If they are the same, it can be determined that the first terminal device does not meet the conditions required for the handover of the radio access technology. If they are different, it can be determined that the first terminal device satisfies the conditions required for the handover of the radio access technology.
  • the corresponding radio access technology was LTE. If the service currently requested by the first terminal device has a higher delay requirement (a service with a higher delay requirement requires a larger subcarrier interval), then the subcarrier interval required by the service currently requested by the first terminal device It can be greater than the subcarrier spacing required by the last requested service.
  • the radio access technology is NR, a larger subcarrier spacing can be provided. Therefore, the network device can determine that the first terminal device meets the conditions required for the handover of the radio access technology, and the first terminal device can be handed over from LTE to NR.
  • step S301 refers to the specific description of step S201 in FIG. 2, which will not be repeated here.
  • Step S302 In the case that the handover condition is not met, the first terminal device according to one of the configuration coefficients of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, and the resource The allocation information determines the preparation time of the side link, and the PDCCH is used to carry the first DCI.
  • the first terminal device can determine whether the handover condition is satisfied, that is, whether the radio access technology will be handed over.
  • the first terminal device may also receive the second DCI from the network device, that is, the receiving time of the second DCI is before the receiving time of the first DCI .
  • the network device Before sending the DCI (including the first DCI and the first DCI) to the first terminal device, the network device will use the scrambling information to scramble the DCI.
  • the scrambling information may be the aforementioned scrambling code (such as C-RNTI, TC-RNTI, RA-RNTI).
  • the scrambling information of the first DCI and the scrambling information of the second DCI may indicate that the formats of the first DCI and the second DCI are the same.
  • the formats of the first DCI and the second DCI are the same, which may indicate that the first DCI and the second DCI come from a cell that uses the same radio access technology.
  • the scrambling information of the first DCI and the second DCI received by the first terminal device are both In RAT I, it can be determined that the first terminal device will not be handed over from LTE to NR, that is, it can be determined that the handover condition is not met. If the scrambling information of the first DCI received by the first terminal device is RAT I and the scrambling information of the second DCI received is RAT II, it can be determined that the first terminal device is about to switch from LTE to NR, that is, Make sure that the switching conditions are met. Therefore, if the scrambling information of the first DCI is the same as the scrambling information of the second DCI, the first terminal device may determine that the handover condition is not satisfied.
  • the handover time may not be considered in the process of determining the preparation time of the side link.
  • the first terminal device may determine the side link preparation according to one of the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient, and the aforementioned resource allocation information. duration.
  • the first terminal device may determine the smallest configuration coefficient from the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient; and determine the bearer The interval duration between the time-frequency resource of the PSCCH and the time-frequency resource carrying the PSSCH in the time domain; then, the side link preparation duration is determined according to the minimum configuration coefficient and the interval duration.
  • there are multiple sub-carrier intervals such as 15Khz, 30Khz, 60Khz, 120Khz, 240Khz, 480Khz
  • LTE includes a subcarrier interval (15Khz), that is, there is a subcarrier interval configuration coefficient in LTE.
  • the time required for a terminal device to prepare PSSCH data is related to the hardware processing capability of the terminal device, and the hardware processing capabilities of different terminal devices are different. Therefore, by determining a longer side link preparation time, it is beneficial for terminal devices with different hardware processing capabilities to be ready to send when the time period for receiving the first DCI is greater than or equal to the side link preparation time PSSCH data for the second terminal device.
  • the interval between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH in the time domain can be determined by the multiplexing between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH The relationship is determined.
  • Fig. 3b is a schematic diagram of four multiplexing relationships between the time-frequency resources carrying the PSCCH and the time-frequency resources carrying the PSSCH.
  • the white-filled area is the time-frequency resource that bears the PSCCH
  • the gray-filled area is the time-frequency resource that bears the PSSCH.
  • the time-frequency resource carrying PSCCH and the time-frequency resource carrying PSSCH are independent and non-overlapping in the time domain, that is, the transmission time of PSCCH and the transmission time of PSSCH different.
  • the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH are continuous in the time domain.
  • the time-frequency resource carrying the PSCCH may occupy one or more time units in the time domain.
  • the number of time units occupied by the time-frequency resource carrying the PSCCH in the time domain may be any one of the following values: 2, 3, 4, or 5.
  • the time unit can be an orthogonal frequency division multiplexing (OFDM) symbol, a slot, a mini-slot, a radio frame, and a subframe. , Transmission time interval (TTI), etc., which are not limited in the embodiment of the present application.
  • OFDM orthogonal frequency division multiplexing
  • TTI Transmission time interval
  • the interval between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH in the time domain can be: carrying PSCCH The number of time units occupied by the time-frequency resource in the time domain, that is, the length of the interval between the transmission time of the PSCCH and the transmission time of the PSSCH.
  • the subcarrier interval of the physical channel may affect the length of one time unit.
  • the time unit is an OFDM symbol
  • the smaller the subcarrier spacing the longer the length of one OFDM symbol.
  • the configuration coefficient of the subcarrier spacing of the physical channel can affect the length of a time unit.
  • the larger the configuration coefficient of the sub-carrier spacing of the physical channel the shorter the length of a time unit; the smaller the configuration coefficient of the sub-carrier spacing of the physical channel, the longer the length of a time unit.
  • the unit of the length of the time unit may be seconds, milliseconds, microseconds, and so on.
  • the sending time is the same.
  • the interval duration between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH in the time domain is zero.
  • the side link preparation duration may be determined according to the expression of the side link preparation duration.
  • Side link preparation time The expression can be:
  • ⁇ min( ⁇ SL grant , ⁇ PSSCH , ⁇ PSCCH ),
  • ⁇ SL grant may be the configuration coefficient of the sub-carrier spacing of the PDCCH used to carry the aforementioned first DCI
  • ⁇ PSSCH may be the configuration of the sub-carrier spacing of the PSSCH
  • the coefficient, ⁇ PSCCH may be a configuration coefficient of the subcarrier spacing of the PSCCH
  • ⁇ is the minimum configuration coefficient among ⁇ SL grant , ⁇ PSSCH and ⁇ PSCCH.
  • N 2, SL can be used to indicate the hardware processing capability of the first terminal device.
  • N 2,SL may be used to indicate the ability of the first terminal device to demodulate the PDCCH. After the first terminal device successfully demodulates the first DCI in the PDCCH, the PSCCH can be sent to the second terminal device. Therefore, N 2,SL may be used to indicate the time required between the first terminal device receiving the first DCI and the sending of the PSCCH to the second terminal device.
  • N 2 and SL can be divided into different value ranges. For the first terminal device with weak hardware processing capability , the corresponding relationship between ⁇ and N 2 ,SL can be shown in Table 2.
  • the corresponding relationship between ⁇ and N 2 ,SL can be shown in Table 3.
  • the unit of N 2, SL can be a time unit.
  • d is a constant. d can be 0, 1, or other constants. In an implementation manner, if the first OFDM symbol of the PSSCH is only composed of a demodulation reference signal (DMRS), then d may be zero. At this time, the side link preparation time The expression is:
  • ⁇ can be the interval between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH in the time domain.
  • the length of time required As can be seen from the foregoing, when the multiplexing relationship between the time-frequency resources carrying PSCCH and the time-frequency resources carrying PSSCH is shown in (1) and (2) in Figure 3b, ⁇ can be any of the following values: 2, 3, 4 or 5. When the multiplexing relationship between the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH is shown in (3) and (4) in Figure 3b, ⁇ is 0.
  • the first terminal device when the handover conditions are not met (for example, the first terminal device only supports one radio access technology (such as 5G NR)), the first terminal device can be based on the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficients of the subcarrier spacing of the PSSCH or the configuration coefficients of the subcarrier spacing of the PDCCH, and the resource allocation information determine the side link preparation time. In turn, it is possible to avoid sending the PSSCH to the second terminal device when the duration of receiving the first DCI is less than the side link preparation duration, thereby helping to avoid resource waste.
  • the PSCCH subcarrier spacing configuration coefficient One of the configuration coefficients of the subcarrier spacing of the PSSCH or the configuration coefficients of the subcarrier spacing of the PDCCH, and the resource allocation information determine the side link preparation time.
  • FIG. 4 is a schematic flowchart of another method for determining the duration of a side link provided by an embodiment of the present application.
  • the execution subject of step S401 is a network device or a chip in a network device
  • the execution subject of step S402 is a first terminal device or a chip in a first terminal device.
  • the network device and the first terminal device are used as The execution subject of the method for determining the side link duration is described as an example.
  • the method may include but is not limited to the following steps:
  • Step S401 The network device sends a first DCI to a first terminal device, where the first DCI includes indication information, and the indication information includes a switching duration, and the switching duration is used to indicate the duration required for the switching of the radio access technology.
  • the network device can determine whether the first terminal device meets the conditions required for the handover of the radio access technology. If it is determined that the first terminal device meets the conditions required for the switching of the radio access technology, it means that the radio access technology corresponding to the first terminal device can be switched.
  • the indication information in the first DCI sent by the network device to the first terminal device may include the handover duration.
  • step S401 for the rest of the execution process of step S401, please refer to the specific description of step S201 in FIG. 2, which will not be repeated here.
  • Step S402 In the case that the handover condition is met and the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, the first terminal device according to the PSCCH subcarrier spacing configuration coefficient, PSSCH One of the configuration coefficient of the subcarrier spacing or the configuration coefficient of the PDCCH subcarrier spacing, and the handover duration determine the side link preparation duration.
  • the first terminal device may determine whether the handover condition is satisfied, that is, whether the radio access technology will be handed over. Regarding how to determine whether the handover condition is satisfied, refer to the specific description in step S302, which will not be repeated here.
  • the first terminal device may also determine the priority of the radio access technology after the handover and the priority of the radio access technology before the handover.
  • the later the wireless access technology is proposed the higher the priority of the wireless technology may be; the earlier the wireless access technology is proposed, the lower the priority of the wireless technology may be.
  • the radio access technology after the handover is LTE and the radio access technology before the handover is NR
  • the priority of LTE may be lower than the priority of NR.
  • the first terminal device may according to the configuration coefficient of the PSCCH subcarrier spacing and the PSSCH subcarrier One of the configuration coefficient of the carrier spacing or the configuration coefficient of the subcarrier spacing of the PDCCH, and the handover duration determine the side link preparation duration.
  • the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, and only the wireless access technology (such as LTE) after the handover is
  • the allocation coefficient for the PSCCH subcarrier spacing and the allocation coefficient for the PSSCH subcarrier spacing are the same as the allocation coefficient for the PDCCH subcarrier spacing.
  • the first terminal device may determine the side link preparation time according to any one of the PSCCH subcarrier spacing configuration coefficient, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient, and the handover duration. .
  • the side link preparation time The expression can be:
  • N TA can be the timing advance calibration between downlink and uplink.
  • N TA is a negative offset from the time when the downlink subframe is received to the time when the uplink subframe is transmitted.
  • the downlink subframe may refer to a subframe that carries the first DCI
  • the uplink subframe may refer to a physical uplink control channel (PUCCH).
  • PUCCH physical uplink control channel
  • T S ⁇ 2 - ⁇ ⁇ T c , where ⁇ is the allocation coefficient of the subcarrier spacing of the physical channel in the radio access technology after the handover.
  • ⁇ the allocation coefficient of the subcarrier spacing of the physical channel in the radio access technology after the handover.
  • X1 is the switching duration. Specifically, it can be the time required to switch from NR to LTE.
  • the unit of switching duration can be the same as The units are the same, or they can be different. For example, the unit of switching duration is milliseconds, The unit is seconds.
  • X1 can be determined by the value of three bits (such as target bits) in the first DCI.
  • X1 may be related to the hardware processing capability of the first terminal device.
  • the first terminal device may send the capability information (ie, hardware processing capability) of the first terminal device to the network device, so that the network device determines the switching duration according to the hardware processing capability.
  • X1 corresponding to the same value of the three target bits may be different or the same. For example, when the first terminal device is divided into three types of hardware processing capabilities (such as capability 1, capability 2, capability 3), under different hardware processing capabilities, the corresponding relationship between the value of the three target bits and X1 can be as follows Table 4 shows.
  • the first terminal device is divided into three types of hardware processing capabilities, and Table 4 is only used as an example, and does not constitute a limitation to the embodiment of the present application. In other feasible implementation manners, the first terminal device can also be divided into 2, 4, or other types of hardware processing capabilities, and the correspondence between the values of the three target bits and X1 can be as shown in Table 4. different.
  • the m may have a corresponding relationship with the "side link index indication value" in the first DCI.
  • the corresponding relationship can be shown in Table 5.
  • the first DCI may be 5A format DCI.
  • the first terminal device may also determine the target time T according to the side link preparation time length and the time when the subframe (carrying the first DCI) is received.
  • the first terminal device sends the PSSCH to the second terminal device after the target time T, which can avoid the situation of sending the PSSCH to the second terminal device when the first terminal device is not ready for PSSCH data.
  • the expression of the target time T can be:
  • T DL is the moment when the first terminal device receives the subframe carrying the first DCI.
  • T DL is the moment when the first terminal device receives the subframe carrying the first DCI.
  • the first terminal device when the handover conditions are met and the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, the first terminal device can be based on the PSCCH subcarrier spacing One of the configuration coefficient of, the configuration coefficient of the sub-carrier spacing of the PSSCH, or the configuration coefficient of the sub-carrier spacing of the PDCCH, and the handover duration determine the side link preparation duration. Further, the target time T can be determined. The first terminal device sends the PSSCH to the second terminal device after the target time T, which can avoid the situation of sending the PSSCH to the second terminal device when the first terminal device is not ready for PSSCH data.
  • FIG. 5 is a schematic flowchart of another method for determining side link duration according to an embodiment of the present application.
  • the execution subject of step S501 is a network device or a chip in a network device
  • the execution subject of step S502 is a first terminal device or a chip in a first terminal device.
  • the network device and the first terminal device are used as The execution subject of the method for determining the side link duration is described as an example.
  • the method may include but is not limited to the following steps:
  • Step S501 The network device sends a first DCI to a first terminal device.
  • the first DCI includes indication information.
  • the indication information includes resource allocation information and handover duration.
  • the resource allocation information is used to indicate the time-frequency resources and bearers that carry the aforementioned PSCCH.
  • the switching duration is used to indicate the duration required for the switching of the radio access technology.
  • the network device can determine whether the first terminal device meets the conditions required for the handover of the radio access technology. If it is determined that the first terminal device meets the conditions required for the switching of the radio access technology, it means that the radio access technology corresponding to the first terminal device can be switched.
  • the indication information in the first DCI sent by the network device to the first terminal device may include the handover duration.
  • the first terminal device may also determine the priority of the radio access technology after the handover and the priority of the radio access technology before the handover. In one implementation, when the handover condition is met and the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, the network device sends the first terminal device to the first terminal device.
  • the indication information in the DCI may include resource allocation information. For example, when the wireless access technology after the handover is NR and the wireless access technology before the handover is LTE, the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover. At this time, The indication information in the first DCI may include handover duration and resource allocation information.
  • step S501 can be referred to the specific description of step S201 in FIG. 2, which will not be repeated here.
  • Step S502 In the case that the handover condition is met and the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, the first terminal device according to the PSCCH subcarrier spacing configuration coefficient, PSSCH One of the configuration coefficient of the sub-carrier spacing of the PDCCH or the configuration coefficient of the sub-carrier spacing of the PDCCH, the resource allocation information and the handover duration determine the side link preparation duration.
  • the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, and it exists in the wireless access technology (such as NR) after the handover
  • the first terminal device may determine the smallest configuration coefficient from the PSCCH sub-carrier spacing configuration coefficient, PSSCH sub-carrier spacing configuration coefficient, or PDCCH sub-carrier spacing configuration coefficient; and determine the time-frequency resource and time-frequency resources that bear the PSCCH.
  • the interval duration of the time-frequency resource carrying the PSSCH in the time domain; then, according to the minimum configuration coefficient, the interval duration and the handover duration, the side link preparation duration is determined.
  • step S302 in FIG. 3a determines the smallest configuration coefficient from the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient; and determine the time-frequency resource carrying the PSCCH and the PSSCH
  • the first terminal device After the first terminal device determines the minimum configuration coefficient and interval duration, it may determine the side link preparation duration according to the expression of the side link preparation duration, the minimum configuration factor, the interval duration and the switching duration.
  • Side link preparation time The expression can be:
  • X2 is the switching duration. Specifically, it can be the time required to switch from LTE to NR. In an implementation manner, X2 can be determined by the value of three bits (such as target bits) in the first DCI. X2 may be related to the hardware processing capability of the first terminal device. In an implementation manner, when the hardware processing capabilities of the first terminal device are different, X2 corresponding to the same value of the three target bits may be different or the same. It should be noted that X2 may be the same as or different from X1 in step S402, which is not limited in the embodiment of the present application.
  • the expression of the target time T may be:
  • T DL is the moment when the first terminal device receives the subframe carrying the first DCI.
  • the first terminal device when the handover conditions are met and the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, the first terminal device can be based on the PSCCH subcarrier spacing One of the configuration coefficient of, the configuration coefficient of the subcarrier spacing of the PSSCH, or the configuration coefficient of the subcarrier spacing of the PDCCH, the resource allocation information and the handover duration determine the side link preparation time. Further, the target time T can be determined. The first terminal device sends the PSSCH to the second terminal device after the target time T, which can avoid the situation of sending the PSSCH to the second terminal device when the first terminal device is not ready for PSSCH data.
  • FIG. 6 is a schematic flowchart of another method for determining the side link duration provided by an embodiment of the present application.
  • the method describes in detail how the network device determines the handover duration according to the capability information of the first terminal device.
  • the execution subject of steps S602 to S603 is the network device, or the chip in the network device
  • the execution subject of step S601 and step S604 is the first terminal device, or the chip in the first terminal device.
  • the first terminal device is an example for the execution subject of the method for determining the side link duration.
  • the method may include but is not limited to the following steps:
  • Step S601 The first terminal device sends the capability information of the first terminal device to the network device.
  • the capability information of the first terminal device may be hardware processing capability.
  • the hardware processing capability of the first terminal device can affect the time required for the handover of the radio access technology (ie, the handover duration). This is because only when the first terminal device supports at least two wireless access technologies, the wireless access technology will be switched. Therefore, the first terminal device can send its own hardware processing capability to the network device when it supports at least two wireless access technologies.
  • Step S602 The network device determines the switching duration according to the capability information of the first terminal device, and the switching duration is used to indicate the duration required for the switching of the radio access technology.
  • the network device may determine the handover duration according to the capability information of the first terminal device.
  • the capability information is the hardware processing capability of the first terminal device
  • the stronger the hardware processing capability of the first terminal device the shorter the determined handover duration may be.
  • the weaker the hardware processing capability of the first terminal device the longer the determined handover duration can be.
  • the capability information of the first terminal device may be a numerical value, and the numerical value may be used to characterize the hardware processing capability of the first terminal device. For each value, the network device can store the corresponding duration. Furthermore, the network device may determine the duration corresponding to the received value as the handover duration.
  • Step S603 The first network device sends a first DCI to the first terminal device when it is determined that the first terminal device meets the conditions required for the handover of the radio access technology, where the first DCI includes indication information, and the indication information Including the switching duration.
  • the network device determines the handover duration, it can determine whether the first terminal device meets the conditions required for the handover of the radio access technology. If it is determined that the first terminal device meets the conditions required for the switching of the radio access technology, it means that the radio access technology corresponding to the first terminal device can be switched.
  • the indication information in the first DCI sent by the network device to the first terminal device may include the switching duration, and the switching duration is also used to determine the side link preparation duration of the first terminal device.
  • Step S604 In the case that the handover condition is met and the priority of the radio access technology after the handover is lower than the priority of the radio access technology before the handover, the first terminal device according to the PSCCH subcarrier spacing configuration coefficient, PSSCH One of the configuration coefficient of the subcarrier spacing or the configuration coefficient of the PDCCH subcarrier spacing, and the handover duration determine the side link preparation duration.
  • step S604 refers to the specific description of step S402 in FIG. 4, which will not be repeated here.
  • the indication information in the first DCI includes the switching duration.
  • the indication information in the first DCI may also include resource allocation information, where the resource allocation information is used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH.
  • the first terminal device may determine the side link according to one of the PSCCH subcarrier spacing configuration coefficient, PSSCH subcarrier spacing configuration coefficient, or PDCCH subcarrier spacing configuration coefficient, resource allocation information, and handover duration. Preparation time. For the execution process, refer to the specific description of step S502 in FIG. 5, which will not be repeated here.
  • the network device can determine the handover duration according to the capability information of the first terminal device.
  • the methods provided in the embodiments of the present application are introduced from the perspectives of the network device and the first terminal device respectively.
  • the network device and the first terminal device may include a hardware structure and a software module, and the above functions are implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module.
  • One of the above-mentioned functions can be executed in a hardware structure, a software module, or a hardware structure plus a software module.
  • FIG. 7 is a schematic structural diagram of a communication device 70 according to an embodiment of this application.
  • the communication device 70 shown in FIG. 7 may include a transceiver module 701 and a processing module 702.
  • the transceiver module 701 may include a sending module and/or a receiving module.
  • the sending module is used to realize the sending function
  • the receiving module is used to realize the receiving function
  • the sending and receiving module 701 may realize the sending function and/or the receiving function.
  • the transceiver module can also be described as a communication module.
  • the communication device 70 may be a terminal device (such as the first terminal device in the foregoing method embodiment), a device in a terminal device, or a device that can be matched and used with the terminal device.
  • the communication device 70 may be a network device, a device in a network device, or a device that can be matched and used with the network device.
  • the communication device 70 is a terminal device (such as the first terminal device in the foregoing method embodiment): the transceiver module 701 is configured to receive a first DCI from a network device, and the first DCI includes indication information; and the processing module 702 is configured to One of the configuration coefficient of the subcarrier spacing of PSCCH, the configuration coefficient of subcarrier spacing of PSSCH, or the configuration coefficient of subcarrier spacing of PDCCH, and the indication information, determine the side link preparation time; the PDCCH is used to carry the first A DCI; wherein the indication information may include at least one of the following: resource allocation information, the resource allocation information is used to indicate the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH; the handover duration, the handover duration is used for Indicates the time required for the handover of the wireless access technology.
  • the processing module 702 may also be used to: when the handover condition is not met, according to the configuration coefficient of the PSCCH subcarrier spacing, the configuration coefficient of the PSSCH subcarrier spacing, or the configuration of the PDCCH subcarrier spacing One of the coefficients and resource allocation information determine the side link preparation time.
  • the processing module 702 may be further configured to determine that the aforementioned handover condition is not satisfied if the scrambling information of the first DCI is the same as the scrambling information of the second DCI, wherein the receiving time of the second DCI Before the reception time of the first DCI.
  • the processing module 702 may also be used to determine the smallest configuration coefficient from the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient; Determine the time-frequency resource carrying the PSCCH and the interval duration in the time domain of the time-frequency resource carrying the PSSCH; determine the side link preparation duration according to the minimum configuration coefficient and the interval duration.
  • the processing module 702 may also be used to: when the handover condition is met and the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, according to the PSCCH One of the configuration coefficient of the sub-carrier spacing, the configuration coefficient of the sub-carrier spacing of the PSSCH, or the configuration coefficient of the sub-carrier spacing of the PDCCH, and the aforementioned switching duration determine the side link preparation duration.
  • the processing module 702 may also be used to: when the handover condition is met and the priority of the radio access technology after the handover is higher than the priority of the radio access technology before the handover, according to the PSCCH One of the subcarrier spacing configuration coefficient, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient, the aforementioned resource allocation information and the aforementioned handover duration determine the side link preparation time.
  • the processing module 702 may also be used to determine the smallest configuration coefficient from the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient; Determine the time-frequency resource carrying the PSCCH and the interval duration of the time-frequency resource carrying the PSSCH in the time domain; determine the side link preparation duration according to the minimum configuration coefficient, the interval duration and the handover duration.
  • the transceiver module 701 may also be used to send the capability information of the terminal device to the network device, and the capability information of the terminal device is used to determine the handover duration.
  • the communication device 70 is a network device: the transceiver module 701 is used to receive the capability information of the terminal device from the terminal device; the processing module 702 is used to determine the switching duration according to the capability information of the terminal device, and the switching duration is used to indicate wireless The time required for the switching of the access technology; the transceiver module 701 can also be used to send the first DCI to the terminal device when it is determined that the terminal device meets the conditions required for the switching of the wireless access technology.
  • the DCI includes indication information, and the indication information includes the switching duration; the switching duration may also be used to determine the side link preparation duration of the terminal device.
  • the aforementioned indication information may also include resource allocation information, and the resource allocation information is used for It indicates the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH.
  • the resource allocation information can also be used to determine the side link preparation time of the aforementioned terminal device.
  • FIG. 8 is a schematic structural diagram of another communication device 80 according to an embodiment of the present application.
  • the communication device 80 may be a network device, a terminal device (such as the first terminal device in the foregoing method embodiment), a chip, a chip system, or a processor that supports the network device to implement the foregoing method, or it may be Chips, chip systems, or processors that support terminal devices to implement the above methods.
  • the device can be used to implement the method described in the foregoing method embodiment, and for details, please refer to the description in the foregoing method embodiment.
  • the communication device 80 may include one or more processors 801.
  • the processor 801 may be a general-purpose processor or a special-purpose processor or the like. For example, it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute computer programs, and process Computer program data.
  • the communication device 80 may further include one or more memories 802, on which a computer program 804 may be stored, and the processor 801 executes the computer program 804, so that the communication device 80 executes the methods described in the foregoing method embodiments. method.
  • the memory 802 may also store data.
  • the communication device 80 and the memory 802 can be provided separately or integrated together.
  • the communication device 80 may further include a transceiver 805 and an antenna 806.
  • the transceiver 805 may be called a transceiver unit, a transceiver, or a transceiver circuit, etc., for implementing the transceiver function.
  • the transceiver 805 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 80 may further include one or more interface circuits 807.
  • the interface circuit 807 is used to receive code instructions and transmit them to the processor 801.
  • the processor 801 executes the code instructions to make the communication device 80 execute the method described in the foregoing method embodiment.
  • the communication device 80 is a terminal device (such as the first terminal device in the foregoing method embodiment): the processor 801 is configured to execute step S202 in FIG. 2; execute step S302 in FIG. 3a; step S402 in FIG. 4; Step S502 in Figure 6; or Step S604 in Figure 6.
  • the transceiver 805 is used to perform step S601 in FIG. 6.
  • the communication device 80 is a network device: the transceiver 805 is configured to perform step S201 in FIG. 2; perform step S301 in FIG. 3a; step S401 in FIG. 4; step S501 in FIG. 5; or step S603 in FIG.
  • the processor 801 is configured to execute step S602 in FIG. 6.
  • the processor 801 may include a transceiver for implementing receiving and sending functions.
  • the transceiver may be a transceiver circuit, or an interface, or an interface circuit.
  • the transceiver circuits, interfaces, or interface circuits used to implement the receiving and transmitting functions can be separate or integrated.
  • the foregoing transceiver circuit, interface, or interface circuit can be used for code/data reading and writing, or the foregoing transceiver circuit, interface, or interface circuit can be used for signal transmission or transmission.
  • the processor 801 may store a computer program 803, and the computer program 803 runs on the processor 801 to enable the communication device 80 to execute the method described in the foregoing method embodiment.
  • the computer program 803 may be solidified in the processor 801.
  • the processor 801 may be implemented by hardware.
  • the communication device 80 may include a circuit, and the circuit may implement the sending or receiving or communication function in the foregoing method embodiment.
  • the processor and transceiver described in this application can be implemented in integrated circuit (IC), analog IC, radio frequency integrated circuit RFIC, mixed signal IC, application specific integrated circuit (ASIC), printed circuit board ( printed circuit board, PCB), electronic equipment, etc.
  • the processor and transceiver can also be manufactured by various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-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 nMetal-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 embodiment may be a network device or a terminal device (such as the first terminal device in the foregoing method embodiment), but the scope of the communication device described in this application is not limited to this, and the structure of the communication device may be Not limited by Figure 8.
  • the communication device may be a stand-alone device or may be part of a larger device.
  • the communication device may be:
  • the IC collection may also include storage components for storing data and computer programs;
  • ASIC such as a modem (Modem)
  • the communication device can be a chip or a chip system
  • the chip shown in FIG. 9 includes a processor 901 and an interface 902.
  • the number of processors 901 may be one or more, and the number of interfaces 902 may be multiple.
  • the chip is used to implement the functions of the terminal device in the embodiment of the present application (such as the first terminal device in the foregoing method embodiment):
  • the interface 902 is configured to receive a first DCI from a network device, where the first DCI includes indication information; and the processor 901 is configured to perform according to the configuration coefficient of the PSCCH subcarrier spacing, the configuration coefficient of the PSSCH subcarrier spacing, or the subcarrier spacing of the PDCCH.
  • One item in the carrier spacing configuration coefficient and the indication information determine the side link preparation time; the PDCCH is used to carry the first DCI; wherein the indication information may include at least one of the following: resource allocation information, the resource The allocation information is used to indicate the time-frequency resource that bears the PSCCH and the time-frequency resource that bears the PSSCH; the handover duration, which is used to indicate the time required for the handover of the radio access technology.
  • the processor 901 may be further configured to: when the handover condition is not met, according to the configuration coefficient of the PSCCH subcarrier spacing, the configuration coefficient of the PSSCH subcarrier spacing, or the configuration of the PDCCH subcarrier spacing One of the coefficients and resource allocation information determine the side link preparation time.
  • the processor 901 may be further configured to determine that the aforementioned switching condition is not satisfied if the scrambling information of the first DCI is the same as the scrambling information of the second DCI, wherein the receiving time of the second DCI Before the reception time of the first DCI.
  • the processor 901 may be further configured to determine the smallest configuration coefficient from among the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient; Determine the time-frequency resource carrying the PSCCH and the interval duration in the time domain of the time-frequency resource carrying the PSSCH; determine the side link preparation duration according to the minimum configuration coefficient and the interval duration.
  • the processor 901 may be further configured to: when the handover condition is met and the priority of the wireless access technology after the handover is lower than the priority of the wireless access technology before the handover, according to the PSCCH One of the configuration coefficient of the sub-carrier spacing, the configuration coefficient of the sub-carrier spacing of the PSSCH, or the configuration coefficient of the sub-carrier spacing of the PDCCH, and the aforementioned switching duration determine the side link preparation duration.
  • the processor 901 may be further configured to: when the handover condition is met and the priority of the wireless access technology after the handover is higher than the priority of the wireless access technology before the handover, according to the PSCCH One of the subcarrier spacing configuration coefficient, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient, the aforementioned resource allocation information and the aforementioned handover duration determine the side link preparation time.
  • the processor 901 may be further configured to determine the smallest configuration coefficient from among the configuration coefficient of the PSCCH subcarrier spacing, the PSSCH subcarrier spacing configuration coefficient, or the PDCCH subcarrier spacing configuration coefficient; Determine the time-frequency resource carrying the PSCCH and the interval duration of the time-frequency resource carrying the PSSCH in the time domain; determine the side link preparation duration according to the minimum configuration coefficient, the interval duration and the handover duration.
  • the interface 902 may also be used to send the capability information of the aforementioned terminal device to the network device, and the capability information of the terminal device is used to determine the handover duration.
  • the interface 902 is configured to receive capability information of the terminal device from the terminal device; the processor 901 is configured to determine the handover duration according to the capability information of the terminal device. Duration; interface 902 can also be used to send a first DCI to the terminal device when it is determined that the terminal device meets the conditions required for handover of the radio access technology.
  • the first DCI includes indication information, and the indication information includes the Handover duration; the handover duration can also be used to determine the side link preparation duration of the terminal device.
  • the aforementioned indication information may also include resource allocation information, and the resource allocation information is used for It indicates the time-frequency resource carrying the PSCCH and the time-frequency resource carrying the PSSCH.
  • the resource allocation information can also be used to determine the side link preparation time of the aforementioned terminal device.
  • the chip further includes a memory 903, and the memory 903 is used to store necessary computer programs and data.
  • An embodiment of the present application also provides a system for determining the duration of a side link.
  • the system includes a communication device as a terminal device in the embodiment of FIG. 7 (such as the first terminal device in the foregoing method embodiment) and a communication device as a network device.
  • the device, or, the system includes the communication device as the terminal device in the embodiment of FIG. 8 (such as the first terminal device in the foregoing method embodiment) and the communication device as the network device.
  • the present application also provides a readable storage medium on which instructions are stored, and when the instructions are executed by a computer, the functions of any of the foregoing method embodiments are realized.
  • This application also provides a computer program product, which, when executed by a computer, realizes the functions of any of the foregoing method embodiments.
  • the computer program product includes one or more computer programs.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer program may 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 may be downloaded from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.
  • At least one in this application can also be described as one or more, and the multiple can be two, three, four or more, which is not limited in this application.
  • the technical feature is distinguished by “first”, “second”, “third”, “A”, “B”, “C”, and “D”, etc.
  • first”, “Second”, “Third”, “A”, “B”, “C” and “D” there is no order or size order among the technical features.
  • the corresponding relationships shown in the tables in this application can be configured or pre-defined.
  • the value of the information in each table is only an example, and can be configured to other values, which is not limited in this application.
  • the corresponding relationship shown in some rows may not be configured.
  • appropriate deformation adjustments can be made based on the above table, such as splitting, merging, and so on.
  • the names of the parameters shown in the titles in the above tables may also be other names that can be understood by the communication device, and the values or expressions of the parameters may also be other values or expressions that can be understood by the communication device.
  • other data structures can also be used, such as arrays, queues, containers, stacks, linear tables, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables. Wait.
  • the pre-definition in this application can be understood as definition, pre-definition, storage, pre-storage, pre-negotiation, pre-configuration, curing, or pre-fired.

Abstract

本申请实施例公开了一种确定侧链路时长的方法及其装置，可以应用于车联网、V2X、V2V等系统中，该方法包括：终端设备接收来自网络设备的第一DCI，该第一DCI包括指示信息；并根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。通过实施本申请实施例，可以确定侧链路准备时长，从而节省资源，避免资源浪费。

Description

一种确定侧链路时长的方法及其装置 技术领域
本申请涉及通信技术领域，尤其涉及一种确定侧链路时长的方法及其装置。
背景技术
随着汽车保有量的迅速增加，基于网联化、智能化、共享化、电动化的智能出行方案越来越多地引起各方面的关注。智能出行建立在以人、车、路协同的辅助驾驶、自动驾驶为核心的智能交通系统之上，新场景、新需求的引入，推进车联网从仅支持车载信息服务的传统车联网向支持车联一切服务的下一代车联网发展。
在车联网中，终端与终端之间通过侧链路(sidelink，SL)通信。sidelink包括物理侧链路控制信道(physical sidelink control channel，PSCCH)和物理侧链路共享信道(physical sidelink share channel，PSSCH)。PSCCH中的侧链控制信息(sidelink control information，SCI)可以指示接收PSSCH所需的信息，如PSSCH信道资源以及传输参数等。PSSCH用于承载sidelink通信的数据。
为了接收PSSCH，终端需要先接收PSCCH。相应的，若终端需要向另一终端发送数据，则需要向该另一终端发送PSCCH和PSSCH，该PSSCH用于承载该终端需要向该另一终端发送的数据。
终端在接收到来自基站的下行控制信息(downlink control information，DCI)之后，需要一定的时间来准备向另一终端发送的PSSCH数据，所需的时长可以称为侧链路准备时长。通过确定侧链路准备时长，可以避免终端在未准备好PSSCH数据之前，向另一终端发送PSSCH。
但是，目前尚缺乏用于确定侧链路准备时长的有效手段。
发明内容
本申请实施例提供一种确定侧链路时长的方法及其装置，可以应用于车联网，例如车与任何事物(vehicle to everything，V2X)通信、车间通信长期演进技术(long term evolution-vehicle，LTE-V)、车辆与车辆(vehicle to vehicle，V2V)通信等，或可以用于智能驾驶，智能网联车等领域，通过确定侧链路准备时长，可以避免在未准备好PSSCH数据之前发送PSSCH，从而有利于节省资源，避免资源浪费。
第一方面，本申请实施例提供一种确定侧链路时长的方法，该方法包括：终端设备接收来自网络设备的第一下行控制信息DCI，该第一DCI包括指示信息；并根据物理侧链路控制信道PSCCH的子载波间隔的配置系数、物理侧链路共享信道PSSCH的子载波间隔的配置系数或物理下行控制信道PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载该第一DCI；其中，该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
在该技术方案中，可以确定侧链路准备时长。进一步的，终端设备可以在接收到第一 DCI的时长大于或等于该侧链路准备时长的情况下，向另一终端设备发送PSSCH。通过这种方式，可以避免在接收到该第一DCI的时长小于该侧链路准备时长的情况下向另一终端设备发送PSSCH，从而有利于避免资源浪费。
在一种实现方式中，终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长的具体实施方式可以为：在不满足切换条件的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。
在该技术方案中，在不满足切换条件的情况下(如终端设备仅支持一种无线接入技术)，终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。
在一种实现方式中，该方法还可以包括：若该第一DCI的加扰信息与第二DCI的加扰信息相同，则终端设备确定不满足前述切换条件，其中，该第二DCI的接收时间在该第一DCI的接收时间之前。
在一种实现方式中，在不满足切换条件的情况下，终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长的具体实施方式可以为：从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数和该间隔时长，确定侧链路准备时长。
在该技术方案中，在确定侧链路准备时长的过程中，所采用的子载波间隔的配置系数越小，可以使得侧链路准备时长越长。终端设备准备PSSCH数据所需的时长与该终端设备的硬件处理能力相关，且不同终端设备的硬件处理能力存在差异。因此，通过确定较长的侧链路准备时长，有利于使得具有不同硬件处理能力的终端设备，均能在接收到第一DCI的时长大于或等于侧链路准备时长的情况下，准备好发送给另一终端设备的PSSCH数据。
在一种实现方式中，终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长的具体实施方式可以为：在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述切换时长确定侧链路准备时长。
在该技术方案中，在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。
在一种实现方式中，终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长的具体实施方式可以为：在满足切换条件，且切换后的无线接入技术的优 先级高于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，前述资源分配信息以及前述切换时长确定侧链路准备时长。
在该技术方案中，在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，资源分配信息以及切换时长确定侧链路准备时长。
在一种实现方式中，终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，前述资源分配信息以及前述切换时长确定侧链路准备时长的具体实施方式可以为：从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数、该间隔时长和切换时长，确定侧链路准备时长。
在一种实现方式中，该方法还可以包括：终端设备将该终端设备的能力信息发送至网络设备，该终端设备的能力信息用于确定切换时长。
第二方面，本申请实施例提供另一种确定侧链路时长的方法，该方法包括：网络设备接收来自终端设备的该终端设备的能力信息；根据该终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长；在确定该终端设备满足无线接入技术发生切换所需条件的情况下，向该终端设备发送第一下行控制信息DCI，该第一DCI包括指示信息，该指示信息包括该切换时长；该切换时长还可以用于确定该终端设备的侧链路准备时长。
在该技术方案中，网络设备可以根据终端设备的能力信息，确定切换时长，该切换时长可以用于确定侧链路准备时长。
在一种实现方式中，在切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，该指示信息还可以包括资源分配信息，该资源分配信息用于指示承载物理侧链路控制信道PSCCH的时频资源和承载物理侧链路共享信道PSSCH的时频资源，该资源分配信息还用于确定前述终端设备的侧链路准备时长。
第三方面，本申请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申请中的部分或全部实施例中的功能，也可以具备单独实施本申请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：
收发模块，用于接收来自网络设备的第一DCI，该第一DCI包括指示信息；
处理模块，用于根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载该第一DCI；其中，该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
作为示例，处理模块可以为处理器，收发模块可以为收发器或通信接口，存储模块可以为存储器。
在一种实现方式中，所述通信装置包括：
收发器，用于接收来自网络设备的第一DCI，该第一DCI包括指示信息；
处理器，用于根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载该第一DCI；其中，该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
第四方面，本申请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网络设备的部分或全部功能，比如通信装置的功能可具备本申请中的部分或全部实施例中的功能，也可以具备单独实施本申请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，用于接收来自终端设备的该终端设备的能力信息；
处理模块，用于根据该终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长；
该收发模块，还用于在确定该终端设备满足无线接入技术发生切换所需条件的情况下，向该终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括该切换时长；该切换时长还可以用于确定该终端设备的侧链路准备时长。
作为示例，处理模块可以为处理器，收发模块可以为收发器或通信接口，存储模块可以为存储器。
在一种实现方式中，所述通信装置包括：
收发器，用于接收来自终端设备的该终端设备的能力信息；
处理器，用于根据该终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长；
收发器，还用于在确定该终端设备满足无线接入技术发生切换所需条件的情况下，向该终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括该切换时长；该切 换时长还可以用于确定该终端设备的侧链路准备时长。
第五方面，本申请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，执行上述第一方面所述的方法。
第六方面，本申请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，执行上述第二方面所述的方法。
第七方面，本申请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所述的方法。
第八方面，本申请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二方面所述的方法。
第九方面，本申请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所述的方法。
第十方面，本申请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二方面所述的方法。
第十一方面，本申请实施例提供一种确定侧链路时长的系统，该系统包括第三方面所述的通信装置以及第四方面所述的通信装置，或者，该系统包括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。
第十二方面，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所述的方法。
第十三方面，本发明实施例提供一种可读存储介质，用于储存为上述网络设备所用的指令，当所述指令被执行时，使所述网络设备执行上述第二方面所述的方法。
第十四方面，本申请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所述的方法。
第十五方面，本申请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二方面所述的方法。
第十六方面，本申请提供一种芯片系统，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。
第十七方面，本申请提供一种芯片系统，该芯片系统包括至少一个处理器和接口，用于支持网络设备实现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， 用于保存网络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。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请实施例提供的一种通信系统的架构示意图；
图2是本申请实施例提供的一种确定侧链路时长的方法的流程示意图；
图3a是本申请实施例提供的另一种确定侧链路时长的方法的流程示意图；
图3b是本申请实施例提供的一种承载PSCCH的时频资源和承载PSSCH的时频资源之间的4种复用关系的示意图；
图4是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图；
图5是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图；
图6是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图；
图7是本申请实施例提供的一种通信装置的结构示意图；
图8本申请实施例提供的另一种通信装置的结构示意图；
图9是本申请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，首先介绍本申请涉及的术语。
1、下行控制信息(downlink control information，DCI)
DCI由物理下行控制信道(physical downlink control channel，PDCCH)承载，DCI可以包括上下行资源分配、混合自动重传请求(hybrid automatic repeat request，HARQ)信息、功率控制等。PDCCH是一种物理信道，用于承载下行调度信息。
2、加扰
加扰，是数字信号的加工处理方法，用扰码与原始信号异或运算，从而得到新的信号。通常上行链路物理信道加扰的作用是区分不同的终端，下行链路加扰可以区分小区和信道。其中，扰码可用于对原始信号加扰和解扰。例如，扰码可以对下行控制信息(downlink control information，DCI)加扰，或者也可称为对PDCCH加扰。对DCI加扰具体可以指对DCI的循环冗余校验(cyclic redundancy check，CRC)字段进行加扰。相应地，终端对接收到的DCI进行解扰，具体是指终端对DCI的CRC字段使用相应类型的扰码进行解扰，以确定DCI的格式或者类型等。
扰码可以包括但不限于：小区无线网络临时标识(cell radio network temporary identifier，C-RNTI)、临时小区无线网络临时标识(temporary cell radio network temporary identifier，TC-RNTI)和随机接入无线网络临时标识(random accessradionetworktemporary identifier，RA-RNTI)。
a)C-RNTI和TC-RNTI
若终端处于无线资源控制连接(radio resource control connected，RRC-connected)态， 说明该终端已经被分配到了C-RNTI，终端向网络设备发起随机接入请求时需要携带该C-RNTI。若终端处于RRC空闲(RRC idle)态或者RRC非活跃(RRC inactive)态，说明该终端还未被分配到C-RNTI。若终端请求RRC连接，网络设备在后续的响应信息里可能会给该终端分配一个临时C-RNTI，记为TC-RNTI，待该终端随机接入成功后，TC-RNTI可转化为C-RNTI。
b)RA-RNTI
在随机接入流程中，RA-RNTI的生成与终端发送前导码所用的时频资源相关。例如，当终端A和终端B使用同一个随机接入信道时频资源发起随机接入时，对应的RA-RNTI相同。
3、车与任何事物(vehicle-to-everything，V2X)通信
V2X通信指车辆与外界的任何事物的通信，V2X通信可以包括但不限于：车辆与车辆(vehicle to vehicle，V2V)通信、车与行人(vehicle to pedestrian，V2P)通信、车与基础设施(vehicle to infrastructure，V2I)通信、车与网络(vehicle to network，V2N)通信。
为了更好的理解本申请实施例公开的一种确定侧链路时长的方法，下面首先对本申请实施例适用的通信系统进行描述。
请参见图1，图1为本申请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网络设备和一个终端设备，图1所示的设备数量和形态仅用于举例并不构成对本申请实施例的限定，实际应用中可以包括两个或两个以上的网络设备，两个或两个以上的终端设备。图1所示的通信系统以包括一个网络设备101和一个终端设备102为例。
其中，网络设备101可以用于向终端设备102发送第一DCI，该第一DCI可以包括指示信息，该指示信息可以包括以下至少一项：资源分配信息、切换时长。其中，该资源分配信息可以用于指示承载PSCCH的时频资源和承载PSSCH的时频资源；该切换时长可以用于指示无线接入技术发生切换所需的时长。
终端设备102可以根据用于承载该第一DCI的PDCCH的子载波间隔(sub-carrier spacing，SCS)的配置系数、该PSCCH的子载波间隔的配置系数或该PSSCH的子载波间隔的配置系数中的一项，以及前述指示信息，确定侧链路准备时长。
终端设备102在接收到第一DCI之后，需要一定的时间来准备向另一终端设备发送PSSCH，所需的最短时长阈值即为该侧链路准备时长。若接收到第一DCI的时长大于或等于该侧链路准备时长，则表明终端设备102已准备好发送给另一终端设备的PSSCH数据；若接收到第一DCI的时长小于该侧链路准备时长，则表明终端设备102尚未准备好发送给另一终端设备的PSSCH数据。
若终端设备102准备向另一终端发送PSSCH时，该终端设备102尚未准备好发送给该另一终端设备的PSSCH数据，会导致该另一终端无法接收到完整的PSSCH数据，还会导致资源浪费。在一种实现方式中，若终端设备102准备向另一终端发送PSSCH时，该终端设备102尚未准备好发送给该另一终端设备的PSSCH数据，则该终端设备可以取消向该另一终端发送PSSCH。这样会浪费第一DCI以及用于承载该第一DCI的PDCCH所占的时频资源。
在本申请实施例中，终端设备102确定侧链路准备时长之后，可以在接收到第一DCI的时长大于或等于该侧链路准备时长的情况下，向另一终端设备发送PSSCH。通过这种方式，可以避免在接收到该第一DCI的时长小于该侧链路准备时长的情况下向另一终端设备发送PSSCH，从而有利于避免资源浪费。
需要说明的是，本申请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。还需要说明的是，本申请实施例中的侧链路还可以称为侧行链路或直通链路。
本申请实施例中的网络设备101是网络侧的一种用于发射或接收信号的实体。例如，网络设备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。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。本申请实施例提供的网络设备可以是由集中单元(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的结构可以将网络设备，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。
本申请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终端(terminal)、用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(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、无人驾驶(self-driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请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。
在侧链路通信中，存在4种侧链路传输模式。侧链路传输模式1和侧链路传输模式2用于终端直通(device-to-device，D2D)通信。侧链路传输模式3和侧链路传输模式4用于V2X通信。当采用侧链路传输模式3时，资源分配由网络设备101调度。具体的，网络设备101可以将资源分配信息发送给终端设备102，然后由该终端设备102向另一终端设备分配资源，以使得该另一终端设备可以通过分配到的资源向网络设备101发送信息。在V2X通信中，可以将信号较好或者可靠性较高的终端设备作为终端设备102。本申请实施例中提及的第一终端设备可以指该终端设备102，第二终端设备可以指该另一终端设备。
可以理解的是，本申请实施例描述的通信系统是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请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，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面结合附图对本申请所提供的确定侧链路时长的方法及其装置进行详细地介绍。
请参见图2，图2是本申请实施例提供的一种确定侧链路时长的方法的流程示意图。其中，步骤S201的执行主体为第一终端设备，或者为第一终端设备中的芯片，步骤S202的执行主体为网络设备，或者为网络设备中的芯片，以下以第一终端设备、网络设备为确定侧链路时长的方法的执行主体为例进行说明。如图2所示，该方法可以包括但不限于如下步骤：
步骤S201：网络设备向第一终端设备发送第一下行控制信息DCI，该第一DCI包括指示信息，该指示信息包括以下至少一项：资源分配信息，该资源分配信息用于指示承载物理侧链路控制信道PSCCH的时频资源和承载物理侧链路共享信道PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
网络设备向第一终端设备发送第一DCI，以便第一终端设备根据该第一DCI中的指示信息确定侧链路准备时长。承载PSCCH的时频资源和承载PSSCH的时频资源之间的复用关系会影响侧链路准备时长。网络设备通过将资源分配信息发送至第一终端设备，以便第一终端设备根据该资源分配信息确定承载PSCCH的时频资源和承载PSSCH的时频资源之间的复用关系。因此，在一种实现方式中，前述指示信息可以包括用于指示承载PSCCH的时频资源和承载PSSCH的时频资源的资源分配信息。
在本申请实施例中，第一终端设备可以仅支持一种无线接入技术(radio access technology，RAT)中的侧链路通信，也可以支持至少两种无线接入技术中的侧链路通信。其中，RAT可以包括但不限于LTE、NR或其他未来的新型无线接入技术。例如，第一终端设备可以仅支持NR sidelink，也可以支持NR sidelink和LTE sidelink。
在第一终端设备支持至少两种无线接入技术中的侧链路通信的情况下，无线接入技术可能会发生切换。例如，第一终端设备支持NR sidelink和LTE sidelink的场景下，NR通用的用户到网络的接口(user to network interface in universal，Uu)调度LTE sidelink，可以使得第一终端设备所采用的无线接入技术由NR切换为LTE。
无线接入技术发生切换时，需要花费一段时长才能完成切换，所需的时长即为前述切换时长，该切换时长会影响侧链路准备时长。因此，在一种实现方式中，前述指示信息可以包括该切换时长。该切换时长可以由网络设备计算得到。在一种实现方式中，该切换时长可以与第一终端设备的硬件处理能力相关。第一终端设备可以将自身的硬件处理能力发送给网络设备，然后网络设备基于该第一终端设备的硬件处理能力确定切换时长。第一终端设备的硬件处理能力越强，切换时长可以越短。第一终端设备的硬件处理能力越弱，切换时长可以越长。
步骤S202：第一终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或物理下行控制信道PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载第一DCI。
具体的，第一终端设备接收到来自网络设备的第一DCI之后，可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长。
在本申请实施例中，物理信道(如PDCCH、PSCCH或PSSCH)的子载波间隔可以与该物理信道的子载波间隔的配置系数具有一一对应关系。例如，在5G NR中定义了多个子载波间隔，在NR中PDCCH的子载波间隔与该PDCCH的子载波间隔的配置系数之间的对应关系可以如表1所示。在一种实现方式中，物理信道(如PDCCH、PSCCH或PSSCH)的子载波间隔的配置系数越小，该物理信道的子载波间隔可以越小；该物理信道的子载波间隔的配置系数越大，该物理信道的子载波间隔可以越大。
表1 NR中PDCCH的子载波间隔与该PDCCH的子载波间隔的配置系数之间的对应关系
Figure PCTCN2020075151-appb-000001
第一终端设备在接收到来自网络设备的第一DCI之前，需要与网络设备同步。第一终端设备可以通过接收网络设备发送的同步信号以完成与网络设备之间的同步。其中，该同步信号可以由主同步信号(primary synchronization signal，PSS)和辅同步信号(secondarysynchronizationsignal，SSS)组成。该同步信号可以包括主系统信息块(master information block，MIB)。在本申请实施例中，子载波间隔与带宽资源(bandwidth part，BWP)可以具有对应关系。第一终端设备通过检测MIB指示的带宽资源，可以确定网络设备向第一终端设备发送的PDCCH的子载波间隔，进而通过子载波间隔与子载波间隔的配置系数之间的对应关系，确定该PDCCH的子载波间隔的配置系数。
第一终端设备可以根据前述资源分配信息，以确定向第二终端设备发送的PSCCH所占的带宽资源，以及PSSCH所占的带宽资源。然后，第一终端设备可以根据子载波间隔与带宽资源之间的对应关系，确定该PSCCH的子载波间隔和该PSSCH的子载波间隔。进一步的，第一终端设备可以根据子载波间隔与子载波间隔的配置系数之间的对应关系，确定该PSCCH的子载波间隔的配置系数和该PSSCH的子载波间隔的配置系数。
在本申请实施例中，物理信道的子载波间隔会影响侧链路准备时长。又因物理信道的子载波间隔的配置系数与该物理信道的子载波间隔具有一一对应关系，因此，终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述指示信息，确定侧链路准备时长。
由前述步骤S201可知，无线接入技术发生切换时，切换时长会影响侧链路准备时长。若无线接入技术不切换，那么不会存在切换时长。在本申请实施例中，第一终端设备可以通过判断是否满足切换条件，以确定无线接入技术是否会发生变化。若不满足切换条件，则无线接入技术不会发生变化。此时，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述资源分配信息确定侧链路准备时长。其执行过程可参见图3a所示实施例中的具体描述。
若满足切换条件，则无线接入技术会发生变化。此时，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配 置系数中的一项，以及前述切换时长确定侧链路准备时长。其执行过程可参见图4、图5所示实施例中的具体描述。
通过实施本申请实施例，可以确定侧链路准备时长。进一步的，第一终端设备可以在接收到第一DCI的时长大于或等于该侧链路准备时长的情况下，向第二终端设备发送PSSCH。通过这种方式，可以避免在接收到该第一DCI的时长小于该侧链路准备时长的情况下向第二终端设备发送PSSCH，从而有利于避免资源浪费。
请参见图3a，图3a是本申请实施例提供的另一种确定侧链路时长的方法的流程示意图，该方法详细描述了在不满足切换条件的情况下，第一终端设备如何根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。其中，步骤S301的执行主体为网络设备，或者为网络设备中的芯片，步骤S302的执行主体为第一终端设备，或者为第一终端设备中的芯片，以下以网络设备、第一终端设备为确定侧链路时长的方法的执行主体为例进行说明。该方法可以包括但不限于如下步骤：
步骤S301：网络设备向第一终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括资源分配信息，该资源分配信息用于指示承载前述PSCCH的时频资源和承载前述PSSCH的时频资源。
在本申请实施例中，网络设备可以确定第一终端设备是否满足无线接入技术发生切换所需的条件。若确定第一终端设备不满足无线接入技术发生切换所需的条件，则表示该第一终端设备对应的无线接入技术不会发生切换。在此情况下，网络设备向第一终端设备发送的第一DCI中的指示信息可以不包括切换时长。
在一种实现方式中，若第一终端设备仅支持一种无线接入技术(如5G NR)，则网络设备可以确定该第一终端设备不满足无线接入技术发生切换所需的条件。在另一种实现方式中，在第一终端设备可以支持至少两种无线接入技术的情况下，网络设备可以确定该第一终端设备当前请求的业务所需的子载波间隔是否与上一次请求的业务所需的子载波间隔相同，若相同，则可以确定该第一终端设备不满足无线接入技术发生切换所需的条件。若不同，则可以确定该第一终端设备满足无线接入技术发生切换所需的条件。例如，第一终端设备上一次请求业务时，对应的无线接入技术为LTE。若该第一终端设备当前请求的业务对延时要求较高(对延时要求较高的业务需要较大的子载波间隔)，则该第一终端设备当前请求的业务所需的子载波间隔可以大于上一次请求的业务所需的子载波间隔。无线接入接入技术为NR时，可以提供较大的子载波间隔。因此，网络设备可以确定第一终端设备满足无线接入技术发生切换所需的条件，且该第一终端设备可以从LTE切换至NR。
需要说明的是，步骤S301其余的执行过程可参见图2中步骤S201的具体描述，此处不再赘述。
步骤S302：在不满足切换条件的情况下，第一终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长，该PDCCH用于承载第一DCI。
第一终端设备在接收到来自网络设备的第一DCI的情况下，可以确定是否满足切换条 件，即确定无线接入技术是否会发生切换。在一种实现方式中，第一终端设备在接收到来自网络设备的第一DCI之前，还可以接收来自该网络设备的第二DCI，即第二DCI的接收时间在第一DCI的接收时间之前。网络设备在向第一终端设备发送DCI(包括第一DCI和第一DCI)之前，会采用加扰信息对该DCI进行加扰。该加扰信息可以为前述扰码(如C-RNTI、TC-RNTI、RA-RNTI)。
第一DCI的加扰信息与第二DCI的加扰信息相同时，可以表示该第一DCI和第二DCI的格式相同。该第一DCI和第二DCI的格式相同，可以表示该第一DCI和第二DCI来自于采用同一无线接入技术的小区。例如，若LTE下的小区通过RAT I对DCI进行加扰，NR下的小区通过RAT II对DCI进行加扰，则第一终端设备接收到的第一DCI和第二DCI的加扰信息均为RAT I时，可以确定第一终端设备不会从LTE切换至NR，即可以确定不满足切换条件。若第一终端设备接收到的第一DCI的加扰信息为RAT I，而接收到的第二DCI的加扰信息为RAT II时，可以确定第一终端设备即将从LTE切换至NR，即可以确定满足切换条件。因此，若该第一DCI的加扰信息与第二DCI的加扰信息相同，则第一终端设备可以确定不满足切换条件。
若不满足切换条件，即无线接入技术不切换，那么在确定侧链路准备时长的过程中可以不用考虑切换时长。此时，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述资源分配信息确定侧链路准备时长。在一种实现方式中，第一终端设备可以从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；并确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；然后，根据该最小的配置系数和该间隔时长，确定侧链路准备时长。
在不同的无线接入技术中，可以存在一个或多个子载波间隔的配置系数。例如，NR中存在多个子载波间隔(如15Khz、30Khz、60Khz、120Khz、240Khz、480Khz)，即NR中存在多个子载波间隔的配置系数。LTE中包括一个子载波间隔(15Khz)，即在LTE中存在一个子载波间隔的配置系数。
在确定侧链路准备时长的过程中，所采用的子载波间隔的配置系数越小，可以使得侧链路准备时长越长。在本申请实施例中，终端设备准备PSSCH数据所需的时长与该终端设备的硬件处理能力相关，且不同终端设备的硬件处理能力存在差异。因此，通过确定较长的侧链路准备时长，有利于使得具有不同硬件处理能力的终端设备，均能在接收到第一DCI的时长大于或等于侧链路准备时长的情况下，准备好发送给第二终端设备的PSSCH数据。
在本申请实施例中，承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长，可以通过承载PSCCH的时频资源和承载PSSCH的时频资源之间的复用关系确定。承载PSCCH的时频资源和承载PSSCH的时频资源之间可以具有多种复用关系。如图3b为承载PSCCH的时频资源和承载PSSCH的时频资源之间的4种复用关系的示意图。其中，白色填充区域为承载PSCCH的时频资源，灰色填充区域为承载PSSCH的时频资源。
在图3b中(1)和(2)所示的复用关系中，承载PSCCH的时频资源和承载PSSCH的时频资源在时域上独立非重合，即PSCCH的发送时间与PSSCH的发送时间不同。另外， 在图3b中(1)和(2)所示的复用关系中，承载PSCCH的时频资源和承载PSSCH的时频资源在时域上连续。
需要说明的是，承载PSCCH的时频资源在时域上可以占据一个或多个时间单元。在一种实现方式中，承载PSCCH的时频资源在时域上占据的时间单元的数量可以为如下值中的任一个：2、3、4或5。其中，时间单元可以为正交频分复用技术(orthogonal frequency division multiplexing，OFDM)符号、时隙(slot)、迷你时隙(mini-slot)、无线帧(radio frame)、子帧(subframe)、传输时间间隔(transmission time interval,TTI)等，本申请实施例对此不做限定。由上述可知，在图3b中(1)和(2)所示的复用关系中，承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长可以为：承载PSCCH的时频资源在时域上占据的时间单元的数量，即PSCCH的发送时间与PSSCH的发送时间之间间隔的时长。
在本申请实施例中，物理信道的子载波间隔可以影响一个时间单元的长度。例如，时间单元为OFDM符号时，子载波间隔越小，一个OFDM符号的长度可以越长。又因物理信道的子载波间隔的配置系数与该物理信道的子载波间隔具有一一对应关系，因此，物理信道的子载波间隔的配置系数可以影响一个时间单元的长度。具体的，物理信道的子载波间隔的配置系数越大，一个时间单元的长度可以越短；物理信道的子载波间隔的配置系数越小，一个时间单元的长度可以越长。其中，时间单元的长度的单元可以为秒、毫秒、微秒等。
在图3b中(3)和(4)所示的复用关系中，承载PSCCH的时频资源和承载PSSCH的时频资源在时域上的起始时间重叠，即PSCCH的发送时间与PSSCH的发送时间相同。此时，承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长为0。
第一终端设备确定最小的配置系数和间隔时长之后，可以按照侧链路准备时长的表达式确定侧链路准备时长。侧链路准备时长
Figure PCTCN2020075151-appb-000002
的表达式可以为：
Figure PCTCN2020075151-appb-000003
其中，μ＝min(μ SL grant,μ PSSCH,μ PSCCH),μ SL grant可以为用于承载前述第一DCI的PDCCH的子载波间隔的配置系数，μ PSSCH可以为PSSCH的子载波间隔的配置系数，μ PSCCH可以为PSCCH的子载波间隔的配置系数，μ为μ SL grant、μ PSSCH和μ PSCCH中的最小配置系数。
基于不同的μ，N 2，SL可以用于指示第一终端设备的硬件处理能力。具体的，N 2，SL可以用于指示第一终端设备解调PDCCH的能力。第一终端设备成功解调PDCCH中的第一DCI之后，才能向第二终端设备发送PSCCH。因此，N 2，SL可以用于指示第一终端设备从接收到第一DCI到向第二终端设备发送PSCCH之间所需的时长。在一种实现方式中，按照第一终端设备的硬件处理能力的强弱，可以将N 2，SL分为不同的值域范围。对于硬件处理能力较弱的第一终端设备，μ与N 2，SL之间的对应关系可以如表2所示。
表2对于硬件处理能力较弱的第一终端设备，μ与N 2，SL之间的对应关系
μ N 2，SL(单位：时间单元)
0 8
1 10
2 15
3 20
对于硬件处理能力较强的第一终端设备，μ与N 2，SL之间的对应关系可以如表3所示。其中，N 2，SL的单位可以为时间单元。
表3对于硬件处理能力较强的第一终端设备，μ与N 2，SL之间的对应关系
μ N 2，SL(单位：时间单元)
0 4
1 6
2 10
d为一个常数。d可以为0、1或者其他常数。在一种实现方式中，若PSSCH的第一个OFDM符号仅由导频参考信号(demodulation reference signal，DMRS)组成，则d可以为0。此时，侧链路准备时长
Figure PCTCN2020075151-appb-000004
的表达式为：
Figure PCTCN2020075151-appb-000005
若PSSCH的第一个OFDM符号不仅由DMRS组成，则d可以为1。此时，侧链路准备时长
Figure PCTCN2020075151-appb-000006
的表达式为：
Figure PCTCN2020075151-appb-000007
α可以为承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长，即α为第一终端设备向第二终端发送PSCCH到向该第二终端发送PSSCH之间所需的时长。参见前述可知，承载PSCCH的时频资源和承载PSSCH的时频资源的复用关系如图3b中(1)和(2)所示时，α可以为如下值中的任一个：2、3、4或5。承载PSCCH的时频资源和承载PSSCH的时频资源的复用关系如图3b中(3)和(4)所示时，α为0。其中，α的单位可以为时间单元。κ＝64；T c＝1/(480000·4096)秒。侧链路准备时长
Figure PCTCN2020075151-appb-000008
的单位可以为秒，或者毫秒，微秒等。
通过实施本申请实施例，在不满足切换条件的情况下(如第一终端设备仅支持一种无线接入技术(如5G NR))，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。进而可以避免在接收到第一DCI的时长小于侧链路准备时长的情况下向第二终端设备发送PSSCH，从而有利于避免资源浪费。
请参见图4，图4是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图，该方法详细描述了在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一终端设备如何根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。其中，步骤S401的执行主体为网络设备，或者为网络设备中的芯片，步骤S402的执行主体为第一终端设备，或者为第一终端设备中的芯片，以下以网络设备、第一终端设备为确定侧链路时长的方法的执行主体为例进行说明。该方法可以包括但不限于如下步骤：
步骤S401：网络设备向第一终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
在本申请实施例中，网络设备可以确定第一终端设备是否满足无线接入技术发生切换所需的条件。若确定第一终端设备满足无线接入技术发生切换所需的条件，则表示该第一终端设备对应的无线接入技术可以发生切换。在此情况下，网络设备向第一终端设备发送的第一DCI中的指示信息可以包括切换时长。关于如何确定是否满足无线接入技术发生切换所需的条件，可以参见步骤S301中的具体描述，此处不再赘述。
需要说明的是，步骤S401其余的执行过程可参见图2中步骤S201的具体描述，此处不再赘述。
步骤S402：在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。
第一终端设备在接收到来自网络设备的第一DCI的情况下，可以确定是否满足切换条件，即确定无线接入技术是否会发生切换。关于如何确定是否满足切换条件，可以参见步骤S302中的具体描述，此处不再赘述。
另外，第一终端设备在接收到第一DCI的情况下，还可以确定切换后的无线接入技术的优先级和切换前的无线接入技术的优先级。在一种实现方式中，无线接入技术的提出时间越晚，该无线技术的优先级可以越高；无线接入技术的提出时间越早，该无线技术的优先级可以越低。例如，当切换后的无线接入技术为LTE，切换前的无线接入技术为NR时，由于LTE的提出时间早于NR的提出时间，那么LTE的优先级可以低于NR的优先级。
在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。在一种实现方式中，在满足切换条件，切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级，且在切换后的无线接入技术(如LTE)中仅存在一个子载波间隔的配置系数的情况下，PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数与PDCCH的子载波间隔的配置系数相同。此时，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的任一项，以及切换时长确定侧链路准备时长。此时，侧链路准备时长
Figure PCTCN2020075151-appb-000009
的表达式可以为：
Figure PCTCN2020075151-appb-000010
其中，N TA可以为下行和上行之间的提前时间(timing advance)校准。或者说，N TA为从接收到下行子帧的时间到传输上行子帧的时间之间的一个负偏移。其中，下行子帧可以指承载第一DCI的子帧，上行子帧可以指物理上行链路控制信道(physical uplink control channel，PUCCH)。
T S＝κ·2 -μ·T c，μ为切换后的无线接入技术中的物理信道的子载波间隔的配置系数。当切换后的无线接入技术为LTE时，μ＝0，即T S＝κ·2 -μ·T c＝64/(480000·4096)秒。
X1为切换时长。具体可以为由NR切换至LTE所需的时长。切换时长的单位可以与
Figure PCTCN2020075151-appb-000011
的单位相同，或者也可以不同。例如，切换时长的单位为毫秒，
Figure PCTCN2020075151-appb-000012
的单位为秒。
在一种实现方式中，可以通过第一DCI中的三个比特位(如目标比特位)的值以确定X1。X1可以与第一终端设备的硬件处理能力相关。在一种实现方式中，第一终端设备可以将该第一终端设备的能力信息(即硬件处理能力)发送至网络设备，以便网络设备根据该硬件处理能力确定切换时长。在一种实现方式中，第一终端设备的硬件处理能力不同时，三个目标比特位的值相同时对应的X1可以不同或者相同。例如，将第一终端设备分为3种硬件处理能力(如能力1、能力2、能力3)时，在不同硬件处理能力下，三个目标比特位的值与X1之间的对应关系可以如表4所示。需要说明的是，将第一终端设备分为3种硬件处理能力，以及表4仅用于举例，并不构成对本申请实施例的限定。在其他可行的实现方式中，还可以将第一终端设备分为2种、4种、或者其他数量种硬件处理能力，并且三个目标比特位的值与X1之间的对应关系可以与表4不同。
表4在不同硬件处理能力下，三个目标比特位的值与X1之间的对应关系
Figure PCTCN2020075151-appb-000013
m与第一DCI中的“侧链路索引指示值”可以具有对应关系。该对应关系可以如表5所示。其中，该第一DCI可以为5A格式的DCI。
表5侧链路索引指示值与m之间的对应关系
侧链路索引指示值 m
00 0
01 1
10 2
11 3
在一种实现方式中，第一终端设备确定侧链路准备时长之后，还可以根据侧链路准备时长，和接收到(承载第一DCI的)子帧的时刻，确定目标时刻T。第一终端设备在目标时刻T之后向第二终端设备发送PSSCH，可以避免在第一终端设备未准备好PSSCH数据时向第二终端设备发送PSSCH的情况发生。目标时刻T的表达式可以为：
Figure PCTCN2020075151-appb-000014
其中，T DL为第一终端设备接收到承载有第一DCI的子帧的时刻。其他参数可参见前述侧链路准备时长
Figure PCTCN2020075151-appb-000015
的表达式中的描述，此处不再赘述。
通过实施本申请实施例，在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。进一步的，可以确定目标时刻T。第一终端设备在目标时刻T之后向第二终端设备发送PSSCH，可以避免在第一终端设备未准备好PSSCH数据时向第二终端设备发送PSSCH的情况发生。
请参见图5，图5是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图，该方法详细描述了在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，第一终端设备如何根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，资源分配信息以及切换时长确定侧链路准备时长。其中，步骤S501的执行主体为网络设备，或者为网络设备中的芯片，步骤S502的执行主体为第一终端设备，或者为第一终端设备中的芯片，以下以网络设备、第一终端设备为确定侧链路时长的方法的执行主体为例进行说明。该方法可以包括但不限于如下步骤：
步骤S501：网络设备向第一终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括资源分配信息和切换时长，该资源分配信息用于指示承载前述PSCCH的时频资源和承载前述PSSCH的时频资源，该切换时长用于指示无线接入技术发生切换所需的时长。
在本申请实施例中，网络设备可以确定第一终端设备是否满足无线接入技术发生切换所需的条件。若确定第一终端设备满足无线接入技术发生切换所需的条件，则表示该第一终端设备对应的无线接入技术可以发生切换。在此情况下，网络设备向第一终端设备发送的第一DCI中的指示信息可以包括切换时长。关于如何确定是否满足无线接入技术发生切换所需的条件，可以参见步骤S301中的具体描述，此处不再赘述。
另外，第一终端设备在接收到第一DCI的情况下，还可以确定切换后的无线接入技术的优先级和切换前的无线接入技术的优先级。在一种实现方式中，在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，网络设备向第一终端设备发送的第一DCI中的指示信息可以包括资源分配信息。例如，当切换后的无线接入技术为NR，切换前的无线接入技术为LTE时，切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级，此时，第一DCI中的指示信息可以包括切换时长和资源分配信息。
需要说明的是，步骤S501其余的执行过程可参见图2中步骤S201的具体描述，此处不再赘述。
步骤S502：在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，第一终端设备根据PSCCH的子载波间隔的配置系数、PSSCH 的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，资源分配信息以及切换时长确定侧链路准备时长。
在一种实现方式中，在满足切换条件，切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级，且在切换后的无线接入技术(如NR)中存在多个子载波间隔的配置系数的情况下。第一终端设备可以从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；并确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；然后，根据该最小的配置系数、该间隔时长和切换时长，确定侧链路准备时长。
其中，从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；以及确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长的执行过程可参见图3a中步骤S302的具体描述，此处不再赘述。
第一终端设备确定最小的配置系数和间隔时长之后，可以按照侧链路准备时长的表达式、该最小的配置系数、该间隔时长和切换时长，确定侧链路准备时长。侧链路准备时长
Figure PCTCN2020075151-appb-000016
的表达式可以为：
Figure PCTCN2020075151-appb-000017
其中，X2为切换时长。具体可以为由LTE切换至NR所需的时长。在一种实现方式中，可以通过第一DCI中的三个比特位(如目标比特位)的值以确定X2。X2可以与第一终端设备的硬件处理能力相关。在一种实现方式中，第一终端设备的硬件处理能力不同时，三个目标比特位的值相同时对应的X2可以不同或者相同。需要说明的是，X2可以与步骤S402中的X1相同，或者不同，本申请实施例对此不作限定。
在本申请实施例中，目标时刻T的表达式可以为：
Figure PCTCN2020075151-appb-000018
其中，T DL为第一终端设备接收到承载有第一DCI的子帧的时刻。
通过实施本申请实施例，在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，资源分配信息以及切换时长确定侧链路准备时长。进一步的，可以确定目标时刻T。第一终端设备在目标时刻T之后向第二终端设备发送PSSCH，可以避免在第一终端设备未准备好PSSCH数据时向第二终端设备发送PSSCH的情况发生。
请参见图6，图6是本申请实施例提供的又一种确定侧链路时长的方法的流程示意图，该方法详细描述了网络设备如何根据第一终端设备的能力信息，确定切换时长。其中，步骤S602～步骤S603的执行主体为网络设备，或者为网络设备中的芯片，步骤S601和步骤S604的执行主体为第一终端设备，或者为第一终端设备中的芯片，以下以网络设备、第一终端设备为确定侧链路时长的方法的执行主体为例进行说明。该方法可以包括但不限于如下步骤：
步骤S601：第一终端设备将该第一终端设备的能力信息发送至网络设备。
其中，第一终端设备的能力信息可以为硬件处理能力。第一终端设备的硬件处理能力可以影响无线接入技术发生切换所需的时长(即切换时长)。因为仅在第一终端设备支持至少两种无线接入技术的情况下，无线接入技术才会发生切换。因此，第一终端设备可以在自身支持至少两种无线接入技术的情况下，向网络设备发送自身的硬件处理能力。
步骤S602：网络设备根据第一终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
具体的，网络设备接收到该第一终端设备的能力信息之后，可以根据该第一终端设备的能力信息，确定切换时长。当能力信息为第一终端设备的硬件处理能力时，第一终端设备的硬件处理能力越强，确定出的切换时长可以越短。第一终端设备的硬件处理能力越弱，确定出的切换时长可以越长。在一种实现方式中，第一终端设备的能力信息可以为一个数值，该数值可以用于表征该第一终端设备的硬件处理能力。对于每个数值，网络设备可以存储有对应的时长。进而，网络设备可以将接收到的数值所对应的时长确定为切换时长。
步骤S603：第一网络设备在确定该第一终端设备满足无线接入技术发生切换所需条件的情况下，向该第一终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括切换时长。
具体的，网络设备确定切换时长之后，可以确定第一终端设备是否满足无线接入技术发生切换所需的条件。若确定第一终端设备满足无线接入技术发生切换所需的条件，则表示该第一终端设备对应的无线接入技术可以发生切换。在此情况下，网络设备向第一终端设备发送的第一DCI中的指示信息可以包括切换时长，该切换时长还用于确定该第一终端设备的侧链路准备时长。关于如何确定是否满足无线接入技术发生切换所需的条件，可以参见步骤S301中的具体描述，此处不再赘述。
步骤S604：在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及切换时长确定侧链路准备时长。
需要说明的是，步骤S604的执行过程可参见图4中步骤S402的具体描述，此处不再赘述。
在本申请实施例中，在第一终端设备满足无线接入技术发生切换所需条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，第一DCI中的指示信息包括切换时长。在一种实现方式中，在第一终端设备满足无线接入技术发生切换所需条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，第一DCI中的指示信息除了包括切换时长以外，还可以包括资源分配信息，该资源分配信息用于指示承载PSCCH的时频资源和承载PSSCH的时频资源。此时，第一终端设备可以根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，资源分配信息以及切换时长确定侧链路准备时长。其执行过程可参见图5中步骤S502的具体描述，此处不再赘述。
通过实施本申请实施例，网络设备可以根据第一终端设备的能力信息，确定切换时长。
上述本申请提供的实施例中，分别从网络设备、第一终端设备的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，网络设备和第一终端设备可以包括硬件结构、软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能可以以硬件结构、软件模块、或者硬件结构加软件模块的方式来执行。
请参见图7，为本申请实施例提供的一种通信装置70的结构示意图。图7所示的通信装置70可包括收发模块701和处理模块702。收发模块701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701可以实现发送功能和/或接收功能。收发模块也可以描述为通信模块。
通信装置70可以是终端设备(如前述方法实施例中的第一终端设备)，也可以是终端设备中的装置，还可以是能够与终端设备匹配使用的装置。或者，通信装置70可以是网络设备，也可以是网络设备中的装置，还可以是能够与网络设备匹配使用的装置。
通信装置70为终端设备(如前述方法实施例中的第一终端设备)：收发模块701，用于接收来自网络设备的第一DCI，该第一DCI包括指示信息；处理模块702，用于根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载该第一DCI；其中，该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
在一种实现方式中，处理模块702还可以用于：在不满足切换条件的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。
在一种实现方式中，处理模块702还可以用于若该第一DCI的加扰信息与第二DCI的加扰信息相同，则确定不满足前述切换条件，其中，该第二DCI的接收时间在该第一DCI的接收时间之前。
在一种实现方式中，处理模块702还可以用于：从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数和该间隔时长，确定侧链路准备时长。
在一种实现方式中，处理模块702还可以用于：在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述切换时长确定侧链路准备时长。
在一种实现方式中，处理模块702还可以用于：在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，前述资源分配信息以及前述切换时长确定侧链路准备时长。
在一种实现方式中，处理模块702还可以用于：从PSCCH的子载波间隔的配置系数、 PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数、该间隔时长和切换时长，确定侧链路准备时长。
在一种实现方式中，收发模块701还可以用于：将该终端设备的能力信息发送至网络设备，该终端设备的能力信息用于确定切换时长。
通信装置70为网络设备：收发模块701，用于接收来自终端设备的该终端设备的能力信息；处理模块702，用于根据该终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长；该收发模块701，还可以用于在确定该终端设备满足无线接入技术发生切换所需条件的情况下，向该终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括该切换时长；该切换时长还可以用于确定该终端设备的侧链路准备时长。
在一种实现方式中，在切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，前述指示信息还可以包括资源分配信息，该资源分配信息用于指示承载PSCCH的时频资源和承载PSSCH的时频资源，该资源分配信息还可以用于确定前述终端设备的侧链路准备时长。
请参见图8，图8是本申请实施例提供的另一种通信装置80的结构示意图。通信装置80可以是网络设备，也可以是终端设备(如前述方法实施例中的第一终端设备)，也可以是支持网络设备实现上述方法的芯片、芯片系统、或处理器等，还可以是支持终端设备实现上述方法的芯片、芯片系统、或处理器等。该装置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80可以包括一个或多个处理器801。处理器801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，基站、基带芯片，终端、终端芯片，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80中还可以包括一个或多个存储器802，其上可以存有计算机程序804，处理器801执行所述计算机程序804，以使得通信装置80执行上述方法实施例中描述的方法。可选的，所述存储器802中还可以存储有数据。通信装置80和存储器802可以单独设置，也可以集成在一起。
可选的，通信装置80还可以包括收发器805、天线806。收发器805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805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80中还可以包括一个或多个接口电路807。接口电路807用于接收代码指令并传输至处理器801。处理器801运行所述代码指令以使通信装置80执行上述方法实施例中描述的方法。
通信装置80为终端设备(如前述方法实施例中的第一终端设备)：处理器801用于执行图2中的步骤S202；执行图3a中的步骤S302；图4中的步骤S402；图5中的步骤S502； 或图6中的步骤S604。收发器805用于执行图6中的步骤S601。
通信装置80为网络设备：收发器805用于执行图2中的步骤S201；执行图3a中的步骤S301；图4中的步骤S401；图5中的步骤S501；或图6中的步骤S603。处理器801用于执行图6中的步骤S602。
在一种实现方式中，处理器801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801可以存有计算机程序803，计算机程序803在处理器801上运行，可使得通信装置80执行上述方法实施例中描述的方法。计算机程序803可能固化在处理器801中，该种情况下，处理器801可能由硬件实现。
在一种实现方式中，通信装置80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。本申请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网络设备或者终端设备(如前述方法实施例中的第一终端设备)，但本申请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8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、智能终端、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，可参见图9所示的芯片的结构示意图。图9所示的芯片包括处理器901和接口902。其中，处理器901的数量可以是一个或多个，接口902的数量可以是多个。
对于芯片用于实现本申请实施例中终端设备(如前述方法实施例中的第一终端设备)的功能的情况：
接口902，用于接收来自网络设备的第一DCI，该第一DCI包括指示信息；处理器901，用于根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及该指示信息，确定侧链路准备时长；该PDCCH用于承载该第一DCI；其中，该指示信息可以包括以下至少一项：资源分配信息，该资源分配信息用于指示承载该PSCCH的时频资源和承载该PSSCH的时频资源；切换时长，该切换时长用于指示无线接入技术发生切换所需的时长。
在一种实现方式中，处理器901还可以用于：在不满足切换条件的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及资源分配信息确定侧链路准备时长。
在一种实现方式中，处理器901还可以用于若该第一DCI的加扰信息与第二DCI的加扰信息相同，则确定不满足前述切换条件，其中，该第二DCI的接收时间在该第一DCI的接收时间之前。
在一种实现方式中，处理器901还可以用于：从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数和该间隔时长，确定侧链路准备时长。
在一种实现方式中，处理器901还可以用于：在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及前述切换时长确定侧链路准备时长。
在一种实现方式中，处理器901还可以用于：在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，前述资源分配信息以及前述切换时长确定侧链路准备时长。
在一种实现方式中，处理器901还可以用于：从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；确定承载该PSCCH的时频资源和承载该PSSCH的时频资源在时域上的间隔时长；根据该最小的配置系数、该间隔时长和切换时长，确定侧链路准备时长。
在一种实现方式中，接口902还可以用于：将前述终端设备的能力信息发送至网络设备，该终端设备的能力信息用于确定切换时长。
对于芯片用于实现本申请实施例中网络设备的功能的情况：
接口902，用于接收来自终端设备的该终端设备的能力信息；处理器901，用于根据该终端设备的能力信息，确定切换时长，该切换时长用于指示无线接入技术发生切换所需的时长；接口902，还可以用于在确定该终端设备满足无线接入技术发生切换所需条件的情况下，向该终端设备发送第一DCI，该第一DCI包括指示信息，该指示信息包括该切换时长；该切换时长还可以用于确定该终端设备的侧链路准备时长。
在一种实现方式中，在切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，前述指示信息还可以包括资源分配信息，该资源分配信息用于指示承载 PSCCH的时频资源和承载PSSCH的时频资源，该资源分配信息还可以用于确定前述终端设备的侧链路准备时长。
可选的，芯片还包括存储器903，存储器903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申请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申请实施例保护的范围。
本申请实施例还提供一种确定侧链路时长的系统，该系统包括前述图7实施例中作为终端设备(如前述方法实施例中的第一终端设备)的通信装置和作为网络设备的通信装置，或者，该系统包括前述图8实施例中作为终端设备(如前述方法实施例中的第一终端设备)的通信装置和作为网络设备的通信装置。
本申请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。
本申请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申请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：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。
本申请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，本申请不做限制。在本申请实施例中，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。
本申请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，本申请并不限定。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，本申请中的表格中，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。
本申请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申请的范围。
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，仅为本申请的具体实施方式，但本申请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申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (26)

  1. 一种确定侧链路时长的方法，其特征在于，所述方法包括：
    终端设备接收来自网络设备的第一下行控制信息DCI，所述第一DCI包括指示信息；
    所述终端设备根据物理侧链路控制信道PSCCH的子载波间隔的配置系数、物理侧链路共享信道PSSCH的子载波间隔的配置系数或物理下行控制信道PDCCH的子载波间隔的配置系数中的一项，以及所述指示信息，确定侧链路准备时长；所述PDCCH用于承载所述第一DCI；
    其中，所述指示信息包括以下至少一项：
    资源分配信息，所述资源分配信息用于指示承载所述PSCCH的时频资源和承载所述PSSCH的时频资源；
    切换时长，所述切换时长用于指示无线接入技术发生切换所需的时长。
  2. 根据权利要求1所述的方法，其特征在于，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述指示信息，确定侧链路准备时长，包括：
    在不满足切换条件的情况下，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述资源分配信息确定侧链路准备时长。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    若所述第一DCI的加扰信息与第二DCI的加扰信息相同，则所述终端设备确定不满足所述切换条件，其中，所述第二DCI的接收时间在所述第一DCI的接收时间之前。
  4. 根据权利要求2或3所述的方法，其特征在于，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述资源分配信息确定侧链路准备时长，包括：
    所述终端设备从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；
    所述终端设备确定承载所述PSCCH的时频资源和承载所述PSSCH的时频资源在时域上的间隔时长；
    所述终端设备根据所述最小的配置系数和所述间隔时长，确定侧链路准备时长。
  5. 根据权利要求1所述的方法，其特征在于，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述指示信息，确定侧链路准备时长，包括：
    在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述切换时长确定侧链路准备时长。
  6. 根据权利要求1所述的方法，其特征在于，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的 一项，以及所述指示信息，确定侧链路准备时长，包括：
    在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，所述资源分配信息以及所述切换时长确定侧链路准备时长。
  7. 根据权利要求6所述的方法，其特征在于，所述终端设备根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，所述资源分配信息以及所述切换时长确定侧链路准备时长，包括：
    所述终端设备从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；
    所述终端设备确定承载所述PSCCH的时频资源和承载所述PSSCH的时频资源在时域上的间隔时长；
    所述终端设备根据所述最小的配置系数、所述间隔时长和所述切换时长，确定侧链路准备时长。
  8. 根据权利要求5～7中任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备将所述终端设备的能力信息发送至所述网络设备，所述终端设备的能力信息用于确定所述切换时长。
  9. 一种确定侧链路时长的方法，其特征在于，所述方法包括：
    网络设备接收来自终端设备的所述终端设备的能力信息；
    所述网络设备根据所述终端设备的能力信息，确定切换时长，所述切换时长用于指示无线接入技术发生切换所需的时长；
    所述网络设备在确定所述终端设备满足无线接入技术发生切换所需条件的情况下，向所述终端设备发送第一下行控制信息DCI，所述第一DCI包括指示信息，所述指示信息包括所述切换时长；所述切换时长还用于确定所述终端设备的侧链路准备时长。
  10. 根据权利要求9所述的方法，其特征在于，在切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，所述指示信息还包括资源分配信息，所述资源分配信息用于指示承载物理侧链路控制信道PSCCH的时频资源和承载物理侧链路共享信道PSSCH的时频资源，所述资源分配信息还用于确定所述终端设备的侧链路准备时长。
  11. 一种通信装置，其特征在于，包括：
    收发模块，用于接收来自网络设备的第一下行控制信息DCI，所述第一DCI包括指示信息；
    处理模块，用于根据物理侧链路控制信道PSCCH的子载波间隔的配置系数、物理侧链路共享信道PSSCH的子载波间隔的配置系数或物理下行控制信道PDCCH的子载波间隔的配置系数中的一项，以及所述指示信息，确定侧链路准备时长；所述PDCCH用于承载所述第一DCI；
    其中，所述指示信息包括以下至少一项：
    资源分配信息，所述资源分配信息用于指示承载所述PSCCH的时频资源和承载所述PSSCH的时频资源；
    切换时长，所述切换时长用于指示无线接入技术发生切换所需的时长。
  12. 根据权利要求11所述的装置，其特征在于，
    所述处理模块，还用于在不满足切换条件的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述资源分配信息确定侧链路准备时长。
  13. 根据权利要求12所述的装置，其特征在于，所述处理模块还用于若所述第一DCI的加扰信息与第二DCI的加扰信息相同，则确定不满足所述切换条件，其中，所述第二DCI的接收时间在所述第一DCI的接收时间之前。
  14. 根据权利要求12或13所述的装置，其特征在于，所述处理模块，还用于：
    从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；
    确定承载所述PSCCH的时频资源和承载所述PSSCH的时频资源在时域上的间隔时长；
    根据所述最小的配置系数和所述间隔时长，确定侧链路准备时长。
  15. 根据权利要求11所述的装置，其特征在于，
    所述处理模块，还用于在满足切换条件，且切换后的无线接入技术的优先级低于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，以及所述切换时长确定侧链路准备时长。
  16. 根据权利要求11所述的装置，其特征在于，
    所述处理模块，还用于在满足切换条件，且切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，根据PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中的一项，所述资源分配信息以及所述切换时长确定侧链路准备时长。
  17. 根据权利要求16所述的装置，其特征在于，所述处理模块，还用于：
    从PSCCH的子载波间隔的配置系数、PSSCH的子载波间隔的配置系数或PDCCH的子载波间隔的配置系数中，确定最小的配置系数；
    确定承载所述PSCCH的时频资源和承载所述PSSCH的时频资源在时域上的间隔时长；
    根据所述最小的配置系数、所述间隔时长和所述切换时长，确定侧链路准备时长。
  18. 根据权利要求15～17中任一项所述的装置，其特征在于，
    所述收发模块，还用于将所述通信装置的能力信息发送至所述网络设备，所述通信装置的能力信息用于确定所述切换时长。
  19. 一种通信装置，其特征在于，包括：
    收发模块，用于接收来自终端设备的所述终端设备的能力信息；
    处理模块，用于根据所述终端设备的能力信息，确定切换时长，所述切换时长用于指示无线接入技术发生切换所需的时长；
    所述收发模块，还用于在确定所述终端设备满足无线接入技术发生切换所需条件的情况下，向所述终端设备发送第一下行控制信息DCI，所述第一DCI包括指示信息，所述指示信息包括所述切换时长；所述切换时长还用于确定所述终端设备的侧链路准备时长。
  20. 根据权利要求19所述的装置，其特征在于，在切换后的无线接入技术的优先级高于切换前的无线接入技术的优先级的情况下，所述指示信息还包括资源分配信息，所述资源分配信息用于指示承载物理侧链路控制信道PSCCH的时频资源和承载物理侧链路共享信道PSSCH的时频资源，所述资源分配信息还用于确定所述终端设备的侧链路准备时长。
  21. 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1～8中任一项所述的方法。
  22. 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9或10所述的方法。
  23. 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8中任一项所述的方法。
  24. 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9或10所述的方法。
  25. 一种可读存储介质，用于存储有指令，当所述指令被执行时，使如权利要求1至8中任一项所述的方法被实现。
  26. 一种可读存储介质，用于存储有指令，当所述指令被执行时，使如权利要求9或10所述的方法被实现。
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