WO2021027900A1 - 一种通信方法、终端及网络设备 - Google Patents

一种通信方法、终端及网络设备 Download PDF

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Publication number
WO2021027900A1
WO2021027900A1 PCT/CN2020/109012 CN2020109012W WO2021027900A1 WO 2021027900 A1 WO2021027900 A1 WO 2021027900A1 CN 2020109012 W CN2020109012 W CN 2020109012W WO 2021027900 A1 WO2021027900 A1 WO 2021027900A1
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Prior art keywords
terminal
path loss
communication
indication information
layer
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PCT/CN2020/109012
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English (en)
French (fr)
Inventor
张向东
常俊仁
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华为技术有限公司
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Publication of WO2021027900A1 publication Critical patent/WO2021027900A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • This application relates to the field of communications, in particular to a communication method, terminal and network equipment.
  • V2X communication based on sidelink (SL) can support power control not based on feedback, that is, open loop power control.
  • the corresponding path loss needs to be compensated during the open loop power control calculation process to ensure the quality of V2X communication.
  • path loss compensation can be configured to use only the SL path loss for compensation, or it can be configured to use only the downlink (DL) path loss for compensation. It can also be configured as either SL path loss or DL path loss can be used for compensation.
  • the terminal Since the SL communication between the terminals will interfere with the communication based on the Uu interface between the terminal and the base station, when the SL path loss or DL path loss can be used to compensate the transmission power, the terminal will calculate the basis The transmission power obtained by the SL path loss calculation and the transmission power calculated according to the DL path loss, and the smaller one of the two transmission powers is used for SL communication.
  • the SL communication may fail to meet the communication requirements (such as poor communication quality or communication disconnection) due to too small transmission power.
  • the transmit power calculated based on the SL path loss is greater than the transmit power calculated based on the DL path loss
  • the relatively small transmit power calculated based on the DL path loss will be used for SL communication, so that the transmit power is insufficient for normal SL communication problem.
  • the transmission power obtained according to larger path loss compensation is greater.
  • the transmission power obtained according to the SL path loss compensation is generally greater than the transmission obtained according to the DL path loss compensation.
  • the transmission power obtained according to the DL path loss compensation is generally greater than the transmission power obtained according to the SL path loss compensation.
  • the embodiments of the present application provide a communication method and device, which can at least solve the problem that when the SL path loss is greater than the DL path loss, the terminal performs V2X communication with a lower transmission power and cannot meet the communication requirements.
  • an embodiment of the present application provides a communication method.
  • the method may include: a terminal sends first indication information to a network device, the first indication information includes at least one of the following: SL path loss, DL path loss, SL path loss The relationship with the magnitude of the DL path loss; the terminal receives the second indication information from the network device, and the second indication information is used to instruct the terminal to perform SL communication.
  • the terminal can send the path loss in the SL communication process to the network device through the first indication information, so that the network device can know the current status of the SL communication according to the first indication information (such as the quality of the SL communication) , Whether there is a disconnection problem, etc.).
  • the terminal may also receive the second indication information from the network device for performing SL communication, so as to ensure the normal progress of SL communication.
  • the terminal sending the first indication information to the network device includes: when the terminal determines that the SL path loss is greater than the first value, sending the first indication information to the network device, the first value is the DL path loss or according to DL path loss is determined; or, when the terminal determines that the SL path loss is always greater than the second value within a preset time, it sends first indication information to the network device, and the second value is the DL path loss or is determined according to the DL path loss; or, When determining the RLF and SL path loss is greater than the third value, the terminal sends first indication information to the network device, where the third value is the DL path loss or is determined according to the DL path loss. Based on this method, the terminal can send the first indication information to the network device according to preset conditions, so that the network device can know the current state of SL communication when the SL transmission power is low.
  • the terminal sending the first indication information to the network device may include: the terminal periodically sending the first indication information to the network device. Based on this method, the terminal can periodically report the relevant parameters of the current SL communication to the network device.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources.
  • the terminal can perform frequency domain and/or time domain coverage enhancement on more resources allocated by the network device for the current SL communication, so as to improve the SL communication quality.
  • the second indication information includes a power control parameter
  • the method further includes: the terminal uses the SL transmission power determined according to the power control parameter to perform SL communication. Based on this method, the terminal can re-determine the SL transmission power to perform SL communication according to the power control parameters reassigned by the network device for the current SL communication, so as to improve the SL communication quality.
  • the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used to indicate the SL dedicated carrier; the method further includes: the terminal performs on the SL dedicated carrier according to the dedicated carrier information SL communication; or, the second instruction information includes a switching instruction; the method further includes: the terminal switches carriers according to the switching instruction. Based on this method, the terminal can switch the current SL communication to the SL dedicated carrier allocated by the network device or pre-allocated for communication, so as to improve the SL communication quality.
  • the present application provides a communication device, which may be a chip in a terminal or a system on a chip.
  • the communication device can realize the function performed by the terminal in the first aspect or the possible design of the first aspect, and the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the communication device may include: a sending module and a receiving module; for example, the sending module may send data or information to other devices other than the terminal.
  • the sending module may be used to send the first indication information to the network device.
  • the receiving module may be used to receive data or information sent by devices other than the terminal.
  • the receiving module may be used to receive second indication information from a network device.
  • the present application provides a communication device that includes: a processor and a memory; the memory is used to store computer-executable instructions, and when the processor executes the computer-executed instructions stored in the memory, the communication The device executes the communication method of the first aspect or any one of the possible designs of the first aspect.
  • the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the instructions are executed, the first aspect or any possible design of the first aspect is executed Communication method.
  • this application provides a computer program product containing instructions, which when running on a computer, enables the computer to execute the communication method of the first aspect or any one of the possible designs of the first aspect.
  • the present application provides a chip system that includes a processor and a communication interface, which is used to support the terminal to implement the functions involved in the above aspects.
  • the processor communicates to other devices other than the terminal through some communication interfaces.
  • a network device sends the first instruction information.
  • the processor receives the second instruction information sent by other devices (such as a network device) other than the terminal through other communication interfaces.
  • the chip system also includes a memory, and the memory is used to store the necessary program instructions and data of the terminal.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • a communication method further includes: a network device receives first indication information from a terminal, the first indication information includes at least one of the following: SL path loss, DL path loss, SL path loss and DL path The relationship between the magnitude of the loss; the network device sends second indication information to the terminal, and the second indication information is used to instruct the terminal to perform SL communication.
  • the network device can know the current status of SL communication through the first indication information, determine whether to adjust the current SL communication and how to adjust, and instruct the terminal to perform SL communication through the second indication information to ensure the normal SL communication get on.
  • the network device sending the second indication information to the terminal includes: when the network device determines that the SL path loss is greater than the first value, sending the second indication information to the terminal, the first value is the DL path loss or according to The DL path loss is determined; or, when the network device determines that the SL path loss is always greater than the second value within a preset time, the network device sends second indication information to the terminal, and the second value is the DL path loss or is determined according to the DL path loss. Based on this method, the network device can determine whether to send the second indication information to the terminal according to the relationship between the SL path loss and the first value or the second value in the current SL communication.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources. Based on this method, the network device can allocate transmission resources required for SL communication for the current SL communication, and issue the second indication information to the terminal so that the terminal can enhance coverage on the transmission resource to improve the SL communication quality.
  • the second indication information includes power control parameters. Based on this method, the network device can issue the power control parameter to the terminal through the second indication information, so that the terminal can adjust the SL transmission power according to the power control parameter to improve the SL communication quality.
  • the second indication information includes dedicated carrier information, and the dedicated carrier information is used to indicate the SL dedicated carrier; or, the second indication information includes a switching instruction, and the switching instruction is used to instruct the terminal to switch carriers.
  • the network device instructs the terminal to switch the current SL communication to the SL dedicated carrier through the second indication information.
  • the SL dedicated carrier may be preset, and instruct the terminal to switch the carrier of the SL communication through the second indication information.
  • the SL dedicated carrier may also be allocated by the network device to the terminal, and sent to the terminal through the second indication information, so that the terminal can switch the carrier of SL communication.
  • the present application provides a communication device, which may be a chip in a network device or a system on a chip.
  • the communication device can implement the functions performed by the network device in the seventh aspect or the possible design in the seventh aspect, and the functions can be implemented by hardware or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the communication device may include: a receiving module and a sending module; for example, the receiving module may be used to receive data or information sent by other devices other than the network device.
  • the receiving module may be used to receive the first data from the terminal.
  • the sending module may send data or information to other devices other than the network device.
  • the sending module may be used to send second indication information to the terminal.
  • the present application provides a communication device, including: a processor and a memory; the memory is used to store computer execution instructions, and when the communication device is running, the processor executes the computer execution instructions stored in the memory to
  • the network device is made to execute any possible designed communication method as in the seventh aspect or the seventh aspect.
  • the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the instructions When the instructions are executed, the seventh aspect or any one of the possible designs of the seventh aspect is executed. Communication method.
  • this application provides a computer program product containing instructions, which when run on a computer, enables the computer to execute the communication method of the seventh aspect or any one of the possible designs of the seventh aspect.
  • this application provides a chip system that includes a processor and a communication interface, which is used to support the communication device to implement the functions involved in the above aspects.
  • the processor communicates to the outside of the network device through some communication interfaces.
  • Other devices such as a terminal
  • the processor receives the first indication information sent by other devices (such as a terminal) other than the network device through another communication interface.
  • the chip system also includes a memory, and the memory is used to store the necessary program instructions and data of the network device.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • the technical effects brought about by any one of the eighth aspect to the twelfth aspect may refer to the technical effects brought about by any possible design of the seventh aspect or the seventh aspect, here No longer.
  • the present application provides a communication method.
  • the method includes: the first layer entity of the terminal sends first indication information to the second layer entity of the terminal, the first indication information includes at least one of the following: SL path loss, DL Path loss, the size relationship between SL path loss and DL path loss; the second layer entity of the terminal sends second indication information to the first layer entity of the terminal, and the second indication information is used for the terminal to perform SL communication.
  • the second layer entity of the terminal can know the current SL communication situation, and according to the situation, issue the second instruction information to the first layer entity so that the first layer entity can perform SL communication according to the second instruction information. To improve the communication quality of the current SL communication.
  • the first layer entity of the terminal sends the first indication information to the second layer entity of the terminal, including: when the first layer entity of the terminal determines that the SL path loss is greater than the first value, it sends the first indication information to the first layer of the terminal.
  • the layer 2 entity sends the first indication information, and the first value is the DL path loss or is determined according to the DL path loss; or, when the layer 1 entity of the terminal determines that the SL path loss is always greater than the second value within a preset time, it sends the terminal
  • the second layer entity sends the first indication information, and the second value is the DL path loss or is determined according to the DL path loss; or, when the first layer entity of the terminal determines the RLF and the SL path loss is greater than the third value, it sends the first indication to the terminal
  • the layer 2 entity sends the first indication information, and the third value is the DL path loss or is determined according to the DL path loss.
  • the first layer entity of the terminal can send the first indication information to the first layer entity according to preset conditions, so that the first layer entity can know the current state of SL communication when the SL transmit power is low.
  • the first layer entity of the terminal sends the first indication information to the second layer entity of the terminal, including: the first layer entity of the terminal periodically sends the first indication information to the second layer entity of the terminal . Based on this method, the first layer entity can periodically report the relevant parameters of the current SL communication to the second layer entity.
  • the second layer entity of the terminal sends the second indication information to the first layer entity of the terminal, including: when the second layer entity of the terminal determines that the SL path loss is greater than the first value, sending the second indication to the terminal 2.
  • Indication information the first value is the DL path loss or is determined according to the DL path loss; or the second layer entity of the terminal sends second indication information to the terminal when determining that the SL path loss is always greater than the second value within a preset time ,
  • the second value is DL path loss or is determined according to DL path loss.
  • the second layer entity can determine whether to send the second indication information to the first layer entity according to the relationship between the SL path loss and the DL path loss or the first value or the second value in the current SL communication.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources. Based on this method, the second layer entity can allocate the transmission resources required for SL communication for the current SL communication, and send it to the first layer entity through the second instruction information, so that the first layer entity can cover the transmission resource Enhanced to improve the quality of SL communication.
  • the second indication information includes the power control parameter
  • the method further includes: the first layer entity of the terminal uses the SL transmission power determined according to the power control parameter to perform SL communication. Based on this method, the second layer entity can deliver the second indication information including the power control parameter to the first layer entity, so that the first layer entity can adjust the SL transmit power according to the power control parameter to improve the SL communication quality.
  • the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used to indicate the SL dedicated carrier; the method further includes: the first layer entity of the terminal, based on the dedicated carrier information, SL communication is performed on the SL dedicated carrier; or, the second indication information includes a handover indication, and the handover indication is used to instruct the terminal to switch carriers; the method further includes: the first layer entity of the terminal switches the carrier according to the handover indication. Based on this method, the second layer entity instructs the first layer entity to switch the current SL communication to the SL dedicated carrier through the second indication information.
  • the SL dedicated carrier may be preset, and instruct the first layer entity to switch the carrier of SL communication through the second indication information.
  • the SL dedicated carrier may also be allocated by the second layer entity to the first layer entity, and sent to the first layer entity through the second indication information, so that the first layer entity can switch the carrier for SL communication.
  • this application provides a communication device, which may be a terminal or a chip or a system on a chip in the terminal.
  • the communication device can realize the functions performed by the terminal in the above-mentioned thirteenth aspect or the possible design in the thirteenth aspect, and the functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the communication device may include: a first processing module and a second processing module; for example, the first processing module has the function of the first layer entity in the terminal, for example, the first processing module has the access layer in the terminal device (Access Stratum, AS layer) function.
  • the second processing module has the function of the second layer entity in the terminal device.
  • the second processing module has the function of the PC5-S layer, the V2X layer, and the application layer in the terminal device.
  • the present application provides a communication device including: a processor and a memory; the memory is used to store computer execution instructions, and when the communication device is running, the processor executes the computer execution instructions stored in the memory, So that the terminal implements any possible designed communication method as in the above-mentioned thirteenth aspect or the thirteenth aspect.
  • the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium.
  • the instructions When the instructions are executed, the above-mentioned thirteenth aspect or any one of the thirteenth aspects is executed. Designed communication method.
  • the present application provides a computer program product containing instructions that, when run on a computer, enables the computer to execute the communication method of the thirteenth aspect or any one of the possible designs of the thirteenth aspect.
  • this application provides a chip system that includes a processor and a communication interface, and is used to support the terminal to implement the functions involved in the above aspects.
  • the chip system also includes a memory, and the memory is used to store the necessary program instructions and data of the terminal.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • the technical effect brought by any one of the fourteenth aspect to the eighteenth aspect can be referred to the technical effect brought by any possible design of the thirteenth aspect or the thirteenth aspect. , I won’t repeat it here.
  • this application provides a communication system, which may include one or more terminals and/or one or more network devices.
  • one or more terminals may be used to implement the communication provided by the first aspect, any possible design of the first aspect, the thirteenth aspect, or any possible design of the thirteenth aspect.
  • One or more network devices may be used to implement the seventh aspect or any one of the possible designed communication methods of the seventh aspect.
  • FIG. 1 is a schematic diagram of an SL communication scenario provided by the prior art
  • Figure 2 is a schematic diagram of another SL communication scenario provided by the prior art
  • FIG. 3 is a schematic diagram of a network architecture provided by an embodiment of this application.
  • FIG. 4 is a schematic diagram of another network architecture provided by an embodiment of this application.
  • Figure 5 is a schematic diagram of the logical composition of a terminal provided by this application.
  • FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 8 is a schematic diagram of the composition of a communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic diagram of the composition of another communication device provided by an embodiment of the application.
  • FIG. 10 is a schematic diagram of the composition of another communication device provided by an embodiment of the application.
  • FIG. 11 is a schematic diagram of the composition of another communication device provided by an embodiment of the application.
  • FIG. 12 is a schematic diagram of the composition of a chip system provided by an embodiment of the application.
  • FIG. 13 is a schematic diagram of the composition of another communication device provided by an embodiment of this application.
  • FIG. 14 is a schematic diagram of the composition of a chip system provided by an embodiment of the application.
  • Terminals also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • terminals are devices that provide users with voice/data connectivity .
  • handheld devices with wireless connectivity or vehicle-mounted devices.
  • some examples of terminals are: vehicle-mounted computers, mobile phones (mobile phones), tablets, notebook computers, handheld computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices , Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, smart grids (smart) The wireless terminal in grid), the wireless terminal in transportation safety, the wireless terminal in smart city, or the wireless terminal in smart home.
  • MID mobile internet devices
  • VR virtual reality
  • AR Augmented reality
  • Universal Mobile Telecommunications System is a 3G mobile communication technology standard formulated by the 3rd Generation Partnership Project (3GPP) organization, and the long-term evolution of universal mobile communication technology ( Long Term Evolution (LTE) is the long-term evolution of the UMTS technical standard formulated by the 3GPP organization.
  • LTE Long Term Evolution
  • E-UTRAN Evolved UMTS Terrestrial Radio Access Network
  • EPC evolved packet core
  • 5G access network part is called NG-RAN
  • 5G core network part is called 5GC.
  • Mobility Management Entity is a key control node of the 3GPP protocol LTE access network. It is responsible for the positioning of UE (User Equipment) in idle mode and the paging process, including relay. Simply put, MME is responsible for signaling processing. Serving GateWay (S-GW) is a gateway that terminates at the E-UTRAN interface.
  • S-GW Serving GateWay
  • the main function of S-GW may include: when switching between eNBs, it can act as a local anchor point and assist in completing eNB Reordering function; when switching between different 3GPP access networks, as a mobility anchor, it also has reordering function; executes legal interception function; performs data packet routing and forwarding; performs packet marking on the uplink and downlink transmission layers ; In idle state, downlink packet buffering and initiating network-triggered service request functions; used for charging between operators.
  • the network device is a device in a wireless network, for example, a radio access network (RAN) node that connects the terminal to the wireless network.
  • RAN radio access network
  • examples of some RAN nodes are: gNB, ng-eNB, transmission reception point (transmission reception point, TRP), evolved Node B (evolved Node B, eNB), radio network controller (RNC), Node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (base band unit, BBU), roadside unit (Roadside Unit, RSU), or wireless fidelity (Wifi) access point (AP), etc.
  • V2X communication which can be applied to transportation networks.
  • V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, and vehicle-to-people (Vehicle to People, V2P) communication.
  • V2V communication can be performed on a sidelink (sidelink)
  • V2I communication can be performed on a downlink (Downlink, DL).
  • SL communication communication based on sidelink.
  • SL communication can transmit data on a physical SL control channel (Pysical Sidelink Control Channel, PSCCH) and/or a physical SL shared channel (Pysical Sidelink Share Channel, PSSCH).
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Share Channel
  • the SL communication link refers to a wireless communication link between a terminal device and a terminal device.
  • it may be a wireless communication link between a communication device of a vehicle and a communication device of another vehicle in V2X communication.
  • Uu port communication The communication between the terminal and network equipment based on the Uu port may include DL communication.
  • Path loss SL path loss and DL path loss are involved in this application.
  • SL path loss is the data propagation loss between terminal and terminal in SL communication.
  • the DL path loss is the data propagation loss between the terminal and the network device in DL communication.
  • the magnitude of the path loss has a positive correlation with the distance between devices. For example, the greater the distance between terminals, the greater the SL path loss. For another example, the greater the distance between the terminal and the network device (such as the base station), the greater the DL path loss.
  • SL transmit power the transmit power used when the terminal initiates SL communication during SL communication.
  • the SL transmit power may include PSCCH and/or PSSCH, and transmit power of signals or channels on other SL links.
  • “multiple” refers to two or more than two, and other quantifiers are similar.
  • “And/or” describes the association relationship of the associated object, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone.
  • a and/or B which can mean: A alone exists, A and B exist at the same time, and B exists alone.
  • a device means to one or more such devices.
  • at least one (at least one of) means one or any combination of subsequent associated objects, for example, "at least one of A, B, and C" includes A, B, C, AB, AC, BC, or ABC.
  • the terminal when the terminal initiates SL communication, it first needs to determine the SL transmit power.
  • the transmission power of PSSCH and PSCCH can be determined by the following formula (1) and formula (2), respectively.
  • P PSSCH min ⁇ P CMAX,PSSCH ,10log 10 (M PSSCH )+P 0_PSSCH,1 + ⁇ PSSCH,1 ⁇ PL ⁇ ;
  • P PSSCH is the transmit power of PSSCH
  • P CMAX PSSCH are the maximum transmit power on the pre-configured PSSCH
  • M PSSCH is the number of resources configured by the network device for PSSCH
  • P 0_PSSCH 1 is the receiving terminal in the SL communication on the PSCCH
  • the expected received power of ⁇ PSSCH 1 is the path loss compensation coefficient
  • PL is the path loss compensation value.
  • the receiving terminal is a terminal that receives data in SL communication.
  • P PSCCH min ⁇ P CMAX,PSCCH ,10log 10 (M PSCCH )+P 0_PSCCH,1 + ⁇ PSCCH,1 ⁇ PL ⁇ ;
  • P PSCCH is the transmit power of PSCCH
  • P CMAX PSCCH are the maximum transmit power on the pre-configured PSCCH
  • M PSCCH is the number of resources configured by the network device for PSCCH
  • P 0_PSCCH 1 is the receiving terminal in the SL communication on the PSSCH
  • the expected received power of ⁇ PSCCH, 1 is the path loss adjustment coefficient
  • PL is the path loss compensation value.
  • the SL transmit power needs to be determined according to the path loss compensation value and other power control parameters (such as P CMAX , M, P 0 or ⁇ ) when the SL communication is initiated.
  • the specific use of SL path loss or DL path loss to compensate SL transmit power can be determined according to a pre-configured compensation strategy.
  • using the SL path loss to compensate the SL transmission power means that the path loss compensation value when determining the SL transmission power is the value of the SL path loss.
  • Using the DL path loss to compensate the SL transmission power refers to the value of the DL path loss when determining the path loss compensation value of the SL transmission power.
  • the compensation strategy may be to use SL path loss or only SL path loss to compensate for SL transmit power, or use DL path loss or only DL path loss to compensate SL transmit power, or it may be SL. Both path loss and DL path loss can compensate SL transmit power.
  • the terminal will select the SL transmission power calculated according to the DL path loss and the SL transmission power calculated according to the SL path loss. The SL transmission power that is smaller among the SL transmission powers obtained by the loss calculation initiates SL communication.
  • terminal 1 and the terminal 2 are within the coverage of the same network device, please refer to FIG. 1.
  • terminal 1 wants to initiate SL communication to terminal 2
  • terminal 1 if the SL path loss is greater than the DL path loss, then terminal 1 at least needs to initiate SL communication with the SL transmission power obtained according to SL path loss compensation to ensure that the requirements of SL communication can be met .
  • the SL transmission power obtained according to the DL path loss compensation is used to initiate the SL communication in order to reduce the interference to the Uu port communication, it will inevitably lead to the situation that the transmission power is too small.
  • terminal 2 wants to initiate SL communication to terminal 1, similarly, if the SL path loss is greater than the DL path loss between the terminal 2 and the network device, and if the terminal 2 uses the terminal to reduce the interference to the Uu port communication 2
  • the SL transmission power obtained by the DL path loss compensation between the network device and the network device initiates SL communication, which will also cause the transmission power to be too small.
  • terminal 1 and the terminal 2 are within the coverage of different network devices.
  • terminal 1 is within the coverage of network device 1
  • terminal 2 is within the coverage of network device 2
  • the path loss between terminal 1 and network device 1 is DL path loss 1
  • the path between terminal 2 and network device 2 The loss is DL path loss 2
  • the path loss between terminal 1 and terminal 2 is SL path loss.
  • terminal 1 wants to initiate SL communication to terminal 2
  • the SL path loss is greater than DL path loss 1
  • terminal 1 uses the SL transmission power obtained according to DL path loss 1 compensation to initiate SL communication
  • the SL transmission power is because Too small to guarantee the requirements of SL communication.
  • terminal 2 wants to initiate SL communication to terminal 1, if the SL path loss is greater than DL path loss 2, and terminal 2 uses the SL transmission power obtained according to DL path loss 2 compensation to initiate SL communication, the SL transmission power is also The requirements of SL communication cannot be guaranteed.
  • the SL path loss is greater than the DL path loss, it may happen that the SL communication cannot meet the requirements (such as poor SL communication quality or even SL communication disconnection) caused by too small SL transmission power.
  • an embodiment of the present application provides a communication method, which can effectively guarantee the SL communication quality.
  • the network architecture may include E-UTRAN and EPC.
  • E-UTRAN is used to provide terminal-oriented E-UTRA user plane and control plane protocol terminals, and EPC is used for call signaling control and Bearer establishment.
  • the E-UTRAN may be composed of one or more eNBs, and the EPC may include one or more S-GWs and MMEs. Among them, the eNBs can be connected to each other through the X2 interface.
  • the eNB in E-UTRAN can be connected to the MME through the S1-MME interface, and connected to the S-GW through the S1-U interface.
  • the network architecture may include NG-RAN composed of one or more gNBs and/or one or more ng-eNBs, and one or more access and mobility management functions.
  • 5GC consisting of entities (Core Access and Mobility Management Function, AMF) and/or one or more user plan function entities (User plane Function, UPF).
  • AMF Core Access and Mobility Management Function
  • UPF User Plan function entities
  • gNB can provide terminal-oriented New Radio (NR) user plane and control plane protocol terminals
  • ng-eNB provides terminal-oriented E-UTRA user plane and control plane protocol terminals.
  • the gNB and ng-NB can be connected to each other through the Xn interface, and both gNB and ng-NB can be connected to the 5GC through the NG interface.
  • FIG. 5 is a schematic diagram of the logical composition of a terminal provided in this application.
  • the terminal includes at least a layer 1 entity and a layer 2 entity.
  • the first layer entity may be the access layer (AS layer), or a specific protocol layer in the access layer, such as the RRC layer, and the second layer entity may be the PC5-S layer, the V2X layer, or the application layer.
  • the terminal may include a layer 1 entity and a layer 2 entity, where the layer 1 entity may include the AS layer, and the layer 2 entity may include the PC5-S layer and the V2X layer.
  • the application layer may include a layer 1 entity and a layer 2 entity, where the layer 1 entity may include the AS layer, and the layer 2 entity may include the PC5-S layer and the V2X layer.
  • the application layer is a schematic diagram of the logical composition of a terminal provided in this application.
  • the terminal includes at least a layer 1 entity and a layer 2 entity.
  • the first layer entity may be the access layer (AS
  • the AS layer may be a protocol layer related to wireless air interface access, such as RRC, PDCP, RLC, MAC, and PHY layers.
  • the PC5-S layer can be the signaling protocol layer of the PC5 port, which can be used to complete the connection establishment of the PC5 port.
  • the V2X layer may be a management protocol entity related to V2X.
  • the function of the data plane of the V2X layer includes mapping data before the 3GPP protocol layer to data that can be processed by the 3GPP protocol for processing by the 3GPP protocol layer.
  • the PC5-S layer can be the signaling protocol layer of the PC5 port, which can be used to complete the connection establishment of the PC5 port.
  • the PC5-S layer may be a subset of the V2X layer.
  • the PC5-S layer may be a control plane protocol of the V2X layer.
  • the AS layer can be used to perform SL communication with other terminals.
  • the AS layer can also be used to obtain the SL path loss between the terminal and other terminals, and the DL path loss between the terminal and the network device.
  • the AS layer can also be used to determine the relationship between the SL path loss and the DL path loss.
  • the AS layer may also be used to report first indication information to the V2X layer.
  • the first indication information may include the SL path loss and/or DL path loss obtained by the AS layer entity, and the first indication information may also include the AS layer determining the SL path loss and DL path loss size relationship.
  • the V2X layer may be used to process the information reported by the AS layer.
  • the information may be the above-mentioned first indication information reported by the AS layer.
  • the V2X layer can also determine and send information to the AS layer for the AS layer to perform SL communication based on the information.
  • the V2X layer may pre-store information such as transmission resources or power control parameters for SL communication, or SL dedicated carriers, and the SL dedicated carriers may be V2X dedicated carriers.
  • the logical composition and layer naming (such as AS layer, V2X layer, etc.) of the terminal shown in FIG. 5 are only an example provided in this embodiment. In other embodiments, the logical composition of the terminal may include more or fewer layers than shown in the figure, and the layers may also adopt other names.
  • the communication methods provided in the embodiments of the present application can be implemented based on the terminal shown in FIG. 5.
  • the communication method provided in the embodiments of the present application can be applied to V2X communication.
  • the network used to support V2X communication can be any mobile communication network, such as the network shown in FIG. 3 or FIG. 4.
  • the technical solution of this embodiment can be applied to any scenario of V2X communication, such as the scenario shown in FIG. 1 or FIG. 2.
  • the terminal is configured as both SL path loss and DL path loss to compensate the SL transmit power, and the transmit power is the smaller one obtained based on the above two path loss compensations.
  • the situation where the transmission power initiates SL communication is explained.
  • FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • the method may include S601-S604.
  • the terminal sends first indication information to the network device, where the first indication information includes at least one of the following: SL path loss, DL path loss, and the magnitude relationship between the SL path loss and the DL path loss.
  • the SL path loss included in the first indication information may be the value of the SL path loss, or may reflect the measured value of the SL path loss, such as the RSRP (Reference Signal Receiving Power, reference signal received power) of the channel or RSRQ (Reference Signal Receiving Quality, reference signal receiving quality) is equivalent.
  • the DL path loss included in the first indication information may be the value of the DL path loss, or may reflect the measured value of the SL path loss, such as the RSRP or RSRQ of the channel.
  • the relationship between the SL path loss and the DL path loss included in the first indication information may be the relationship between the value of the SL path loss and the value of the DL path loss, for example, the SL path loss is greater than the DL path loss or the DL path loss is greater than the SL path loss. .
  • the terminal when the SL path loss is greater than the DL path loss, in order to reduce the interference to the Uu port communication, the terminal will use the SL transmission power obtained by DL path loss compensation to initiate SL communication. In this way, it may happen that the SL transmission power is insufficient for SL communication, and the terminal can send this situation to the network device.
  • the terminal may send the first indication information to the network device when the preset condition is triggered.
  • the terminal may send the first indication information to the network device when determining that the SL path loss is greater than the first value.
  • the first value may be the DL path loss, or may be a value determined according to the DL path loss, for example, the first value is equal to the DL path loss minus the preset threshold.
  • the terminal can set a timer.
  • the terminal can control the timer to start counting from the first time the terminal determines that the SL path loss is greater than the second value. If the SL path loss is always greater than the DL path loss before the timer expires (that is, within the preset time), Therefore, it is determined that the situation where the SL path loss is greater than the DL path loss is true and stable, and then the terminal can send the first indication information to the network device at the end of the timer.
  • the second value may be the DL path loss, or may be a value determined according to the DL path loss, for example, the second value is equal to the DL path loss minus the preset threshold.
  • the terminal can monitor the occurrence of radio link failure (RLF).
  • RLF radio link failure
  • the terminal can report to the network
  • the device sends first indication information to indicate to the network the reason for the occurrence of RLF, for example, the SL path loss is greater than the third value.
  • the third value may be the DL path loss, or may be a value determined according to the DL path loss, for example, the third value is equal to the DL path loss minus the preset threshold.
  • the first value, the second value, and the third value may be the same or different. Since the SL path loss and DL path loss will change with changes in the relative position between the terminal and the relative position between the terminal and the network device, in order to send the first indication information more accurately and timely, the terminal may Properly advance the time for sending the first instruction information. Therefore, the aforementioned first value, second value, and third value may not be equal to the DL path loss, but less than the DL path loss.
  • the terminal may determine that any one of the above-mentioned preset conditions is satisfied, and when determining that the SL transmission power obtained according to DL compensation is used when initiating SL communication (for example, according to the configuration, and the SL path loss and DL path Loss comparison relationship, select DL path loss as SL transmit power calculation), and then send the first indication information to the network device.
  • the terminal may periodically send the first indication information to the network device according to a preset period.
  • the network device receives first indication information from the terminal.
  • the network device can learn the SL communication parameters of the terminal, such as at least one of the SL path loss, the DL path loss, and the magnitude relationship between the SL path loss and the DL path loss. Based on these parameters, the network device can determine whether the SL transmit power of the terminal is too low. If it is determined that the SL transmit power of the terminal is too low, the following S603 is executed.
  • the network device may determine that the SL transmission power of the terminal is too small when determining that the SL path loss is greater than the first value.
  • the first value is the DL path loss or a value determined according to the DL path loss.
  • the network device may determine that the SL transmission power is too low when determining that the SL path loss is always greater than the second value within a preset time.
  • the second value is the DL path loss or a value determined according to the DL path loss. In this way, the network device can determine that the SL path loss is greater than the second value is a continuous process, thereby avoiding the problem of inaccurate judgment caused by abnormal parameters at a certain moment.
  • a timer may be set in the network device. After the network device receives the first indication information and determines that the SL path loss is greater than the second value, the timer starts to count. If from the start of the timer to the end of the timer, the network device determines that the SL path loss is always greater than the second value based on one or more received first indication information, then the network device can determine that the SL path loss is greater than the second value It is true and stable, so that the network device can more accurately determine whether the SL transmission power is too low in the current SL communication.
  • the first value and the second value may be the same or different.
  • the network device can also obtain DL path loss or SL path loss from other information, so that the network device can determine whether the terminal has too low SL transmission power. .
  • the network device may obtain the value of the DL path loss from other information, so that the network device can determine whether the terminal has too low SL transmission power.
  • the network device can obtain the value of the SL path loss from other information, so that the network device can determine whether the terminal has too low SL transmit power.
  • the network device can directly determine whether the SL transmission power of the terminal is too low based on the magnitude relationship.
  • the network device may obtain the values of the DL path loss and the SL path loss from other information, and determine the magnitude relationship between the SL path loss and the first value or the second value, and compare it with the magnitude relationship in the first indication information. Finally, it is determined whether the terminal will have too little SL transmit power.
  • the network device sends second indication information to the terminal, where the second indication information is used for the terminal to perform SL communication.
  • the network device may determine whether the SL transmission power is too low in the current SL communication based on the first indication information. When the network device determines that the SL transmission power is too low in the current SL communication, the network device can determine whether to take measures to ensure the SL communication.
  • the network device may determine whether to take corresponding measures to ensure the progress of the SL communication (that is, to improve the quality of the SL communication) according to the current service situation of the SL communication (such as service priority). For example, if the business priority of the current SL communication is low, the network device can determine that no corresponding measures need to be taken to ensure the progress of the SL communication. For another example, the current business priority of SL communication is very high (for example, the terminal needs to send important data through the SL communication), then the network device can determine to take corresponding measures to ensure the progress of the SL communication. For example, measures to ensure the normal progress of SL communication may include enabling frequency domain and/or time domain coverage enhancement, adjusting power control parameters, and switching communication carriers. For example, in the embodiment of the present application, the network device may send the second instruction information including corresponding measures to the terminal, so that the terminal can perform SL communication according to the second instruction information, so as to ensure the normal progress of SL communication.
  • the network device may send the second instruction information including corresponding measures
  • the network device may activate the coverage enhancement technology, and send measures related to the coverage enhancement technology to the terminal through the second indication information.
  • coverage enhancement techniques may include frequency domain coverage enhancement.
  • the network device can allocate more frequency domain resources to the terminal, and the frequency domain resource is carried in the second indication information and sent to the terminal, so that the terminal can allocate more frequency domain resources to the network device when the maximum transmission power is not reached.
  • the data to be sent on the resource is repeatedly transmitted to achieve coverage enhancement.
  • the coverage enhancement technology may include time domain coverage enhancement.
  • the network device can allocate more time domain resources to the terminal, and carry the time domain resource in the second indication information to send to the terminal, so that the terminal can perform data to be sent on more time domain resources allocated by the network device. Repeat transmission to achieve coverage enhancement.
  • the frequency domain coverage enhancement and the time domain coverage enhancement in the embodiments of the present application may be repeated transmission on more resources, or may be implemented by using methods such as frequency hopping and beamforming to achieve coverage enhancement.
  • the coverage enhancement technology may include adjustment of SL transmit power.
  • the network device can adjust power control parameters (such as P 0 and/or ⁇ in formula (1) and formula (2)), and send the power control parameter to the terminal through the second indication information, so that the terminal can follow the adjusted
  • the power control parameters are recalculated to obtain the SL transmit power to improve the SL communication quality.
  • the frequency domain resources, time domain resources, and power control parameters used for coverage enhancement may be allocated to the terminal after the network device determines to start the coverage enhancement technology, as in the above example.
  • the sent second indication information may include one or more of frequency domain resources, time domain resources, and power control parameters allocated by the network device to the terminal.
  • the frequency domain resources, time domain resources, and power control parameters used for coverage enhancement may also be pre-configured in the terminal.
  • the second indication information may include information for instructing the terminal to use preset resources (such as frequency domain resources, time domain resources, or power control parameters) for coverage enhancement, so that the terminal can perform coverage enhancement according to the second indication information. Coverage enhancement.
  • the network device may also adopt a carrier switching method to improve the SL communication quality.
  • the network device may send second indication information including dedicated carrier information to the terminal.
  • the dedicated carrier information may include SL dedicated carrier resources or V2X dedicated carrier resources allocated by the network to the terminal to indicate The terminal switches the SL communication on the current shared carrier to the SL dedicated carrier or the V2X dedicated carrier indicated in the dedicated carrier information for SL communication.
  • the SL dedicated carrier or V2X dedicated carrier resources may also be pre-configured in the terminal.
  • the network device may send the second instruction information including the switching instruction to the terminal, so that the terminal switches the current SL communication to the pre-configured SL dedicated carrier or V2X dedicated carrier for communication according to the switching instruction.
  • the network device may also determine to disconnect the current SL communication to release the occupied resources. Then, the network device may send the second indication information including the interruption indication to the terminal, so as to instruct the terminal to disconnect the current SL communication.
  • the terminal receives second indication information from the network device, where the second indication information is used for the terminal to perform SL communication.
  • the terminal may execute a corresponding solution according to the second instruction information from the network device to adjust the current SL communication, so as to improve the current SL communication quality or disconnect the SL communication.
  • the second indication information may include frequency domain resources and/or time domain resources required for SL communication.
  • the terminal may repeatedly transmit the data to be transmitted on the frequency domain resource and/or the time domain resource to ensure that the receiving terminal can accurately receive the data.
  • the SL transmit power used by the terminal may be the same as the previous SL transmit power (for example, the SL transmit power obtained according to DL path loss compensation), or may be different.
  • the selection of the specific SL transmit power can be flexibly set according to the actual situation in the implementation process.
  • the second indication information may include power control parameters.
  • the terminal may recalculate the SL transmission power to perform SL communication according to the adjusted power control parameter included in the second indication information.
  • the DL path loss may be used to compensate the SL transmission power, and the SL path loss may also be used to compensate the SL transmission power.
  • the second indication information may include dedicated carrier information, and the terminal may switch the current SL communication to the SL dedicated carrier or the V2X dedicated carrier indicated by the dedicated carrier information for communication.
  • the second indication information may include a handover instruction, and the terminal can switch the current SL communication to a pre-configured SL dedicated carrier or according to the handover instruction. Communicate on the V2X dedicated carrier.
  • the terminal can use a higher transmission power for SL communication (such as using The SL communication is initiated according to the SL transmission power obtained by the SL path loss compensation) in order to improve the SL communication quality.
  • the second indication information may include an interruption indication
  • the terminal may disconnect the current SL communication after receiving the second indication information, so as to release the resources occupied by the current SL communication.
  • the network device may send the second indication information to the terminal when it is determined that the SL transmission power of the terminal is too low, or it may wait for a certain period of time. Then send the second instruction information to the terminal.
  • the network device may wait for free resources before sending the second indication information to the terminal. During this waiting time, the terminal can continue to perform the current SL communication, and after receiving the second indication information, the terminal can perform SL communication according to the second indication information.
  • the method in the above example can be applied to a scenario where the terminal is configured to select SL path loss or DL path loss compensation to obtain SL transmission power, and can also be applied to other scenarios.
  • the terminal is configured to perform SL communication using SL transmission power obtained by DL path loss compensation.
  • the network device can determine based on the first indication information that the SL path loss is greater than the DL path loss or a value determined according to the DL path loss, and send a second indication to the terminal
  • the information is used to instruct the terminal to reconfigure the above strategy to use the SL transmission power obtained by SL path loss compensation for SL communication. Please refer to Figure 6 for the detailed execution process, which will not be repeated here.
  • the terminal sends the path loss in the SL communication process to the network device through the first indication information, and the network device can know the current status of the SL communication (such as the quality of the SL communication, whether there is a disconnection problem, etc.) .
  • the network device determines that the current SL communication needs to be guaranteed based on the first indication information, it can send second indication information to the terminal to instruct the terminal to improve the quality of the current SL communication through coverage enhancement, power control parameter adjustment, and/or carrier switching. , To ensure the normal progress of SL communication.
  • the first layer entity of the terminal can send relevant parameters of the current SL communication to the second layer entity of the terminal, so that the second layer entity of the terminal determines to adjust the current SL communication. And instruct the first layer entity of the terminal to perform the corresponding SL communication to solve the problem that the SL communication quality may not be guaranteed when the SL path loss is greater than the DL path loss.
  • FIG. 7 is a schematic flowchart of another communication method provided by an embodiment of this application. As shown in Figure 7, the method may include S701-S702.
  • the first layer entity of the terminal sends first indication information to the second layer entity of the terminal, where the first indication information includes at least one of the following: SL path loss, DL path loss, and magnitude relationship between SL path loss and DL path loss.
  • the first layer entity (such as the AS layer) of the terminal may send the first indication information to the second layer entity (such as the V2X layer) of the terminal when a preset condition is triggered.
  • the AS layer determines that the SL path loss is greater than the first value, and sends first indication information to the V2X layer.
  • the first value is the DL path loss or is determined according to the DL path loss; or, the AS layer determines that the SL path loss is always within the preset time. If the value is greater than the second value, send the first indication information to the V2X layer.
  • the second value is the DL path loss or is determined according to the DL path loss; or, when the AS layer determines the RLF and SL path loss is greater than the third value, it sends the first indication to the V2X layer
  • the third value is the DL path loss or is determined according to the DL path loss.
  • the first layer entity (such as the AS layer) of the terminal may also periodically send the first indication information to the second layer entity (such as the V2X layer) of the terminal according to a preset cycle.
  • the second layer entity of the terminal sends second indication information to the first layer entity of the terminal, where the second indication information is used for the terminal to perform SL communication.
  • the layer 2 entity of the terminal can determine whether the SL transmission power is too low in the current SL communication based on the received first indication information.
  • the V2X layer may determine whether the SL path loss is greater than the first value based on the first indication information.
  • the first value may be a value determined according to the DL path loss, or may be the DL path loss. If the SL path loss is greater than the first value, it can be determined that the current SL communication has an SL transmit power problem.
  • the V2X layer may determine whether the SL path loss is always greater than the second value within a preset time based on the first indication information, and the second value is the DL path loss or is determined according to the DL path loss. If the SL path loss is always greater than the second value within the preset time, it can be determined that the current SL communication has a problem of low SL transmit power.
  • the V2X layer can determine that the SL transmission power of the current SL communication is obtained by using DL path loss compensation, thereby clarifying that the current SL communication has a problem of low SL transmission power.
  • the V2X layer can also determine DL path loss or SL path loss according to other information, and then determine whether there is SL transmission in the current SL communication The problem of low power.
  • the V2X layer can determine whether it needs to take corresponding measures to ensure the SL communication.
  • the V2X layer may determine whether to take corresponding measures to ensure the progress of the SL communication according to the current business situation of the SL communication (such as the business priority). For example, if the business priority of the current SL communication is very high, the network device can determine to take corresponding measures to ensure the progress of the SL communication.
  • the V2X layer determines to take corresponding measures to ensure that the SL communication continues, it can determine the corresponding measures and send the instruction of the measures to the AS layer through the second instruction information to perform SL communication.
  • the second indication information may include transmission resources required for SL communication (such as frequency domain resources and/or time domain resources that can be used for coverage enhancement), so that the AS layer can be Frequency domain and/or time domain coverage enhancement is performed on transmission resources.
  • transmission resources required for SL communication such as frequency domain resources and/or time domain resources that can be used for coverage enhancement
  • the second indication information may include a power control parameter, so that the AS layer can recalculate the SL transmit power according to the power control parameter to perform SL communication.
  • the second indication information includes dedicated carrier information required for SL communication
  • the dedicated carrier information may indicate a V2X dedicated carrier so that the AS layer can switch SL communication to a V2X dedicated carrier for communication.
  • the second indication information may include a switching indication, so that the AS layer can switch the SL communication to a preset V2X dedicated carrier for communication.
  • the above-mentioned coverage enhancement resources, or SL/V2X dedicated carrier information, or power control parameter information may be pre-configured in the V2X layer, or may be obtained from the network in advance by the V2X layer.
  • the V2X layer can send the second indication information including the interruption indication to the terminal, so that the AS can disconnect the current SL communication and release Resources occupied.
  • the terminal can determine whether to take corresponding measures to improve the quality of current SL communication through the V2X layer, and send the corresponding measures to the AS layer for execution.
  • the resources used in these measures can be preset in the V2X layer, when the V2X layer Determine the need to perform to ensure the progress of SL communication, then these preset measures can be sent to the AS layer.
  • the AS layer of the terminal sends the current SL communication parameters (such as one or more of the SL path loss, DL path loss, and the magnitude relationship between the SL path loss and the DL path loss) to the V2X layer, so that the V2X layer can pass the first
  • the second indication information instructs the AS layer to take corresponding measures to ensure the communication quality of the current SL communication, which also solves the problem that the SL communication quality may not be guaranteed when the SL path loss is greater than the DL path loss. It can be seen that in the method provided by the embodiment of this application, the terminal can ensure the SL communication quality through the interaction between the V2X layer and the AS layer, and does not need to interact with network equipment. Therefore, this embodiment can be applied to the terminal that cannot communicate with the network. The scenario where the device interacts.
  • the foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various network elements.
  • the above-mentioned terminal and network device include hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present application may divide the terminal and the network device into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and another division method may be used in actual implementation.
  • FIG. 8 shows a schematic diagram of the composition of a communication device 800.
  • the communication device 800 may be a terminal or a chip or a system on a chip in the terminal.
  • the communication device 800 may be used to perform the functions of the terminal involved in the foregoing embodiments.
  • the communication device 800 shown in FIG. 8 includes: a sending module 801 and a receiving module 802.
  • the sending module 801 may be used to send data or information to other devices other than the terminal.
  • the sending module 801 may be used to send first indication information to a network device.
  • the sending module 801 may be used to execute S601 as shown in FIG. 6.
  • the receiving module 802 may be used to receive data or information sent by devices other than the terminal.
  • the receiving module 802 may be used to receive second indication information from a network device.
  • the receiving module 802 may be used to execute S604 as shown in FIG. 6.
  • the sending module 801 is specifically configured to send first indication information to the network device when it is determined that the SL path loss is greater than the first value, where the first value is the DL path loss or is determined according to the DL path loss; or, The sending module 801 is specifically configured to send first indication information to the network device when it is determined that the SL path loss is always greater than the second value within a preset time, where the second value is the DL path loss or is determined according to the DL path loss; or, the sending module 801 is specifically configured to send first indication information to the network device when determining the RLF and SL path loss is greater than a third value, where the third value is the DL path loss or is determined according to the DL path loss.
  • the sending module 801 is specifically configured to periodically send the first indication information to the network device.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources.
  • the second indication information includes a power control parameter, so that the communication device 800 uses the SL transmission power determined according to the power control parameter to perform SL communication.
  • the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used to indicate the SL dedicated carrier. So that the communication device 800 performs SL communication on the SL dedicated carrier according to the dedicated carrier information.
  • the second instruction information includes a switching instruction, so that the communication device 800 switches carriers according to the switching instruction.
  • the communication device provided in the embodiment of the present application is used to perform the function of the terminal in the above-mentioned communication method, and therefore can achieve the same effect as the above-mentioned communication method.
  • the communication device provided in the embodiment of the present application may include a processing module or a control module for supporting the foregoing sending module 801 and/or receiving module 802 to complete corresponding functions.
  • FIG. 9 shows a schematic diagram of the composition of a communication device 900.
  • the communication device 900 may be a chip or a system-on-chip in a network device.
  • the communication device 900 may be used to perform the functions of the network device involved in the foregoing embodiment.
  • the communication device 900 shown in FIG. 9 includes: a receiving module 901 and a sending module 902.
  • the receiving module 901 may be configured to receive first indication information from the terminal.
  • the first indication information includes at least one of the following: SL path loss, DL path loss, and the magnitude relationship between SL path loss and DL path loss.
  • the receiving module 901 may be used to execute S602 as shown in FIG. 6.
  • the sending module 902 may be used to send second indication information to the terminal, and the second indication information is used to instruct the terminal to perform SL communication.
  • the sending module 902 may be used to execute S603 as shown in FIG. 6.
  • the sending module 902 is specifically configured to send second indication information to the terminal when it is determined that the SL path loss is greater than the first value.
  • the first value is the DL path loss or is determined according to the DL path loss.
  • the sending module 902 is specifically configured to send second indication information to the terminal when it is determined that the SL path loss is always greater than the second value within the preset time, and the second value is the DL path loss or is determined according to the DL path loss.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources.
  • the second indication information includes power control parameters.
  • the second indication information includes dedicated carrier information, and the dedicated carrier information is used to indicate the SL dedicated carrier.
  • the second indication information includes a handover indication, and the handover indication is used to instruct the terminal to switch carriers.
  • the communication device provided by the embodiment of the present application is used to perform the function of the network device in the above-mentioned communication method, and therefore can achieve the same effect as the above-mentioned communication method.
  • the communication device provided in the embodiment of the present application may include a processing module or a control module for supporting the foregoing sending module 902 and/or receiving module 901 to complete corresponding functions.
  • FIG. 10 shows a schematic diagram of the composition of another communication device 1000.
  • the communication device 1000 may be a chip or a system on a chip in a terminal.
  • the communication device 1000 may be used to perform the functions of the network device involved in the above-mentioned embodiments.
  • the communication device 1000 shown in FIG. 10 includes: a first processing module 1001 and a second processing module 1002.
  • the first processing module 1001 has the function of the first layer entity (such as the AS layer) in the above-mentioned terminal
  • the second processing module 1002 has the second layer entity (such as the PC5-S layer, the V2X layer and the Application layer) functions, such as: the first processing module 1001 may include the AS layer in the terminal as shown in FIG. 5, and the second processing module 1002 may include the PC5-S layer and the V2X layer in the terminal as shown in FIG. 5 And the application layer.
  • the first processing module 1001 may be configured to send first indication information to the second processing module 1002, where the first indication information includes at least one of the following: SL path loss, DL path loss, and the magnitude relationship between SL path loss and DL path loss.
  • the first processing module 1001 may be used to execute S701 as shown in FIG. 7.
  • the second processing module 1002 may be used to send second instruction information to the first processing module 1001, and the second instruction information is used for the terminal to perform SL communication.
  • the second processing module 1002 may be used to execute S702 as shown in FIG. 7.
  • the first processing module 1001 is specifically configured to send first indication information to the second processing module 1002 when it is determined that the SL path loss is greater than the first value.
  • the first value is the DL path loss or according to the DL path loss. Loss is determined.
  • the first processing module 1001 is specifically configured to send first indication information to the second processing module 1002 when it is determined that the SL path loss is always greater than the second value within a preset time, and the second value is the DL path loss or according to the DL path loss. Loss is determined.
  • the first processing module 1001 is specifically configured to send first indication information to the second processing module 1002 when determining the RLF and SL path loss is greater than a third value, where the third value is the DL path loss or is determined according to the DL path loss.
  • the first processing module 1001 is specifically configured to periodically send the first indication information to the second processing module 1002.
  • the second processing module 1002 is specifically configured to send second indication information to the second processing module 1002 when it is determined that the SL path loss is greater than the first value.
  • the first value is the DL path loss or according to the DL path loss. Loss is determined.
  • the second processing module 1002 is specifically configured to send second indication information to the second processing module 1002 when it is determined that the SL path loss is always greater than the second value within the preset time, and the second value is the DL path loss or according to the DL path loss. Loss is determined.
  • the second indication information includes transmission resources required for SL communication, and the transmission resources include frequency domain resources and/or time domain resources.
  • the second indication information includes power control parameters
  • the first processing module 1001 is further configured to use the SL transmission power determined according to the power control parameters for SL communication.
  • the second indication information includes dedicated carrier information required for SL communication, and the dedicated carrier information is used to indicate the SL dedicated carrier.
  • the first processing module 1001 is also configured to perform SL communication on the SL dedicated carrier according to the dedicated carrier information.
  • the second indication information includes a handover indication, and the handover indication is used to instruct the terminal to switch carriers.
  • the first processing module 1001 is also configured to switch carriers according to the switching instruction.
  • the communication device provided in the embodiment of the present application is used to perform the function of the terminal in the above-mentioned communication method, and therefore can achieve the same effect as the above-mentioned communication method.
  • the functions of the first processing module 1001 and the second processing module 1002 in the embodiments of the present application can be implemented by independent hardware modules, or implemented by independent software modules. It can be implemented by a common hardware processing platform executing program instructions.
  • FIG. 11 shows a schematic diagram of the composition of another communication device 1100.
  • the communication device 1100 may include: a processor 1101 and a memory 1102.
  • the memory 1102 is used to store computer execution instructions. Exemplarily, in some embodiments, when the processor 1101 executes the instructions stored in the memory 1102, the communication device 1100 may be caused to execute S601 and/or S604 as shown in FIG. 6, and other operations that the terminal needs to perform . In other embodiments, when the processor 1101 executes the instructions stored in the memory 1102, the communication device 1100 may be caused to execute S701 and/or S702 as shown in FIG. 7 and other operations that the terminal needs to execute.
  • FIG. 12 shows a schematic diagram of the composition of a chip system 1200.
  • the chip system 1200 may include: a processor 1201 and a communication interface 1202, which are used to support the terminal to implement the functions involved in the foregoing embodiments.
  • the processor 1201 may communicate with other devices (such as network devices) other than the terminal through the communication interface 1202.
  • the processor 1201 sends the first indication information to other devices (such as network devices) other than the terminal through the communication interface 1202.
  • the processor 1201 receives, through the communication interface 1202, the second indication information sent by another device (such as a network device) other than the terminal.
  • the processor 1201 may implement communication between different protocol layers in the terminal through the communication interface 1202.
  • the chip system also includes a memory for storing necessary program instructions and data for the terminal.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • FIG. 13 shows a schematic diagram of the composition of another communication device 1300.
  • the communication device 1300 may include a processor 1301 and a memory 1302.
  • the memory 1302 is used to store computer execution instructions. Exemplarily, when the processor 1301 executes the computer-executable instructions stored in the memory 1302, the communication device 1300 may be caused to execute S602 and/or S603 as shown in FIG. 6 and other operations that the network device needs to execute.
  • FIG. 14 shows a schematic diagram of the composition of a chip system 1400.
  • the chip system 1400 may include a processor 1401 and a communication interface 1402, which are used to support a network device to implement the functions involved in the foregoing embodiments.
  • the processor 1401 may communicate with other devices (such as terminals) other than the network device through the communication interface 1402.
  • the processor 1401 sends the second indication information to another device (such as a terminal) other than the network device through the communication interface 1402.
  • the processor 1401 receives, through the communication interface 1402, the first indication information sent from another device (such as a terminal) other than the network device.
  • the chip system also includes a memory for storing necessary program instructions and data for the terminal.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • the embodiments of the present application also provide a communication system, which may include one or more terminals and/or one or more network devices.
  • a communication system may include one or more terminals and/or one or more network devices.
  • one or more terminals may be used to execute S601 and/or S604 as shown in FIG. 6, or to execute S701 and/or S702 as shown in FIG. 7, and other operations to be executed by the terminal.
  • One or more network devices may be used to perform S602 and/or S603 as shown in FIG. 6 and other operations to be performed by the network device in V2X communication.
  • the communication device provided in the embodiment of the present application is used to perform the function of the terminal in the above-mentioned communication method, and therefore can achieve the same effect as the above-mentioned communication method.
  • the functions or actions or operations or steps in the foregoing embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program When implemented using a software program, it may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted 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 include one or more data storage devices such as servers, data centers, etc. that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

本申请实施例公开了一种通信方法、终端及网络设备，涉及通信领域，解决了当SL路损大于DL路损时，终端以较低的发射功率进行V2X通信导致的无法满足通信要求的问题。具体方案为：终端向网络设备发送第一指示信息，该第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系。终端接收来自网络设备的第二指示信息，该第二指示信息用于指示终端进行SL通信。

Description

一种通信方法、终端及网络设备
本申请要求于2019年8月15日提交国家知识产权局、申请号为201910755650.X、申请名称为“一种通信方法、终端及网络设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种通信方法、终端及网络设备。
背景技术
基于边链路(sidelink，SL)的车辆与其他设备通信(vehicle to everything，V2X)通信可以支持不基于反馈的功率控制，即开环功控。其中，开环功控计算过程中需要补偿对应的路损，以确保V2X通信的质量。可以理解的是，在基于边链路的SL通信中，终端的发射功率越大，通信质量就越好。目前，在SL通信中基于开环功控计算发射功率时，路损的补偿可以被配置为只使用SL路损进行补偿，也可以被配置为只使用下行(downlink，DL)路损进行补偿，也可以被配置为SL路损或DL路损都可以使用进行补偿。
由于终端之间的SL通信会对终端和基站之间的基于Uu接口的通信产生干扰，因此，当被配置为SL路损或DL路损都可以用于补偿发射功率时，终端会分别计算根据SL路损计算获得的发射功率以及根据DL路损计算获得的发射功率，并使用两个发射功率中较小的一个进行SL通信。
这样就可能会造成SL通信由于发射功率过小而无法满足通信要求(如通信质量差或通信断开)的情况发生。例如，当根据SL路损计算的发射功率大于根据DL路损计算的发射功率时，就会采用根据DL路损计算获取的相对较小的发射功率进行SL通信，从而出现发射功率不足以进行正常SL通信的问题。一般而言，根据较大的路损补偿获取的发射功率更大，例如，当SL路损大于DL路损时，根据SL路损补偿获取的发射功率一般会大于根据DL路损补偿获取的发射功率，反之，当DL路损大于SL路损时，根据DL路损补偿获取的发射功率一般会大于根据SL路损补偿获取的发射功率。
因此，就需要一种方案，至少能够解决当SL路损大于DL路损时，终端以较低的发射功率进行V2X通信导致的无法满足通信要求的问题。
发明内容
本申请实施例提供一种通信方法及装置，至少能够解决当SL路损大于DL路损时，终端以较低的发射功率进行V2X通信导致的无法满足通信要求的问题。
为达到上述目的，本申请实施例提供如下技术方案：
第一方面，本申请实施例提供一种通信方法，该方法可以包括：终端向网络设备发送第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系；终端接收来自网络设备的第二指示信息，第二指示信息用于指示终端进行SL通信。
采用上述技术方案，终端可以通过第一指示信息将SL通信过程中的路损情况发送 给网络设备，以便网络设备能够根据该第一指示信息知晓当前SL通信的状态(如SL通信质量的好坏，是否有断开连接的问题等)。终端还可以从网络设备接收第二指示信息，用于进行SL通信，以保证SL通信的正常进行。
在一种可能的设计中，终端向网络设备发送第一指示信息，包括：终端在确定SL路损大于第一值时，向网络设备发送第一指示信息，第一值是DL路损或根据DL路损确定；或，终端在确定SL路损在预设时间内始终大于第二值时，向网络设备发送第一指示信息，第二值是DL路损或根据DL路损确定；或，终端在确定RLF，SL路损大于第三值时，向网络设备发送第一指示信息，第三值是DL路损或根据DL路损确定。基于该方法，终端可以根据预设的条件向网络设备发送第一指示信息，以便网络设备可以在发生SL发射功率较小的情况时知晓当前SL通信的状态。
在一种可能的设计中，终端向网络设备发送第一指示信息可以包括：终端周期性地向网络设备发送第一指示信息。基于该方法，终端可以周期性的将当前SL通信的相关参数上报给网络设备。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，传输资源包括频域资源和/或时域资源。基于该方法，终端能够在网络设备为当前SL通信分配的更多的资源上进行频域和/或时域的覆盖增强，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括功控参数，该方法还包括：终端采用根据功控参数确定的SL发射功率进行SL通信。基于该方法，终端可以根据网络设备为当前SL通信重新分配的功控参数重新确定SL发射功率进行SL通信，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括进行SL通信所需的专用载波信息，专用载波信息用于指示SL专用载波；该方法还包括：终端根据专用载波信息，在SL专用载波上进行SL通信；或，第二指示信息包括切换指示；该方法还包括：终端根据切换指示切换载波。基于该方法，终端可以将当前SL通信切换到网络设备分配的或者预先分配的SL专用载波上进行通信，以提高SL通信质量。
第二方面，本申请提供一种通信装置，该通信装置可以为终端中的芯片或者片上系统。该通信装置可以实现上述第一方面或者第一方面可能的设计中终端所执行的功能，该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。硬件或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：发送模块，接收模块；示例性的，发送模块可以向终端之外的其他设备发送数据或信息，例如发送模块可以用于向网络设备发送第一指示信息。接收模块可以用于接收终端之外的其他设备发送的数据或信息，例如接收模块可以用于接收来自网络设备的第二指示信息。
第三方面，本申请提供了一种通信装置，该通信装置包括：处理器和存储器；该存储器用于存储计算机执行指令，当该处理器执行该存储器存储的该计算机执行指令时，使得该通信装置执行如上述第一方面或者第一方面的任一种可能的设计的通信方法。
第四方面，本申请提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令运行时，执行上述第一方面或者上述第一方面的任一种可能的设计的通信方法。
第五方面，本申请提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第一方面或者上述第一方面的任一种可能的设计的通信方法。
第六方面，本申请提供了一种芯片系统，该芯片系统包括处理器、通信接口，用于支持终端实现上述方面中所涉及的功能，例如处理器通过一些通信接口向终端之外的其他设备(如网络设备)发送第一指示信息，又如，处理器通过另一些通信接口接收终端之外的其他设备(如网络设备)发送的第二指示信息。在一种可能的设计中，芯片系统还包括存储器，存储器，用于保存终端必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
示例性的，第二方面至第六方面中任一种设计方式所带来的技术效果可参见上述第一方面或者第一方面的任一种可能的设计所带来的技术效果，此处不再赘述。
第七方面，提供一种通信方法，该方法还包括：网络设备接收来自终端的第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系；网络设备向终端发送第二指示信息，第二指示信息用于指示终端进行SL通信。
基于该方法，网络设备可以通过第一指示信息知晓当前SL通信的状态，确定是否要对当前SL通信进行调整以及如何调整，并通过第二指示信息指示终端进行SL通信，以保证SL通信的正常进行。
在一种可能的设计中，网络设备向终端发送第二指示信息，包括：网络设备在确定SL路损大于第一值时，向终端发送第二指示信息，第一值是DL路损或根据DL路损确定；或，网络设备在确定SL路损在预设时间内始终大于第二值时，向终端发送第二指示信息，第二值是DL路损或根据DL路损确定。基于该方法，网络设备可以根据当前SL通信中，SL路损与第一值或第二值的关系，确定是否要向终端发送第二指示信息。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，传输资源包括频域资源和/或时域资源。基于该方法，网络设备可以为当前SL通信分配进行SL通信所需的传输资源，并通过第二指示信息下发给终端，以便终端能够在该传输资源上进行覆盖增强，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括功控参数。基于该方法，网络设备可以通过第二指示信息下发功控参数给终端，以便终端能够根据该功控参数调整SL发射功率，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括专用载波信息，专用载波信息用于指示SL专用载波；或，第二指示信息包括切换指示，切换指示用于指示终端切换载波。基于该方法，网络设备通过第二指示信息指示终端将当前SL通信切换到SL专用载波上。示例性的，该SL专用载波可以是预置的，并通过第二指示信息指示终端切换SL通信的载波。该SL专用载波也可以是网络设备为终端分配的，并通过第二指示信息下发给终端，以便终端切换SL通信的载波。
第八方面，本申请提供一种通信装置，该通信装置可以为网络设备中的芯片或者片上系统。该通信装置可以实现上述第七方面或者第七方面中可能的设计中网络设备所执行的功能，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。硬件 或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：接收模块，发送模块；示例性的，接收模块，可以用于接收网络设备之外的其他设备发送的数据或信息，例如，接收模块可以用于接收来自终端的第一指示信息。发送模块可以向网络设备之外的其他设备发送数据或信息，例如，发送模块可以用于向终端发送第二指示信息。
第九方面，本申请提供了一种通信装置，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该网络设备执行如上述第七方面或者第七方面的任一种可能的设计的通信方法。
第十方面，本申请提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令运行时，执行上述第七方面或者第七方面的任一种可能的设计的通信方法。
第十一方面，本申请提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第七方面或者第七方面的任一种可能的设计的通信方法。
第十二方面，本申请提供了一种芯片系统，该芯片系统包括处理器、通信接口，用于支持通信装置实现上述方面中所涉及的功能，例如处理器通过一些通信接口向网络设备之外的其他设备(如终端)发送第二指示信息，又如，处理器通过另一些通信接口接收网络设备之外的其他设备(如终端)发送的第一指示信息。在一种可能的设计中，芯片系统还包括存储器，存储器，用于保存网络设备必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
示例性的，第八方面至第十二方面中任一种设计方式所带来的技术效果可参见上述第七方面或者第七方面的任一种可能的设计所带来的技术效果，此处不再赘述。
第十三方面，本申请提供一种通信方法，方法包括：终端的第一层实体向终端的第二层实体发送第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系；终端的第二层实体向终端的第一层实体发送第二指示信息，第二指示信息用于终端进行SL通信。
基于该方法，终端的第二层实体就可以知晓当前SL通信的情况，并依据该情况向第一层实体下发第二指示信息，以便第一层实体可以根据第二指示信息进行SL通信，以提高当前SL通信的通信质量。
在一种可能的设计中，终端的第一层实体向终端的第二层实体发送第一指示信息，包括：终端的第一层实体在确定SL路损大于第一值时，向终端的第二层实体发送第一指示信息，第一值是DL路损或根据DL路损确定；或，终端的第一层实体在确定SL路损在预设时间内始终大于第二值时，向终端的第二层实体发送第一指示信息，第二值是DL路损或根据DL路损确定；或，终端的第一层实体在确定RLF，SL路损大于第三值时，向终端的第二层实体发送第一指示信息，第三值是DL路损或根据DL路损确定。基于该方法，终端的第一层实体可以根据预设的条件向第一层实体发送第一指示信息，以便第一层实体可以在发生SL发射功率较小的情况时知晓当前SL通信的状态。
在一种可能的设计中，终端的第一层实体向终端的第二层实体发送第一指示信息， 包括：终端的第一层实体周期性地向终端的第二层实体发送第一指示信息。基于该方法，第一层实体可以周期性的将当前SL通信的相关参数上报给第二层实体。
在一种可能的设计中，终端的第二层实体向终端的第一层实体发送第二指示信息，包括：终端的第二层实体在确定SL路损大于第一值时，向终端发送第二指示信息，第一值是DL路损或根据DL路损确定；或，终端的第二层实体在确定SL路损在预设时间内始终大于第二值时，向终端发送第二指示信息，第二值是DL路损或根据DL路损确定。基于该方法，第二层实体可以根据当前SL通信中，SL路损与DL路损或第一值或第二值的关系，确定是否要向第一层实体发送第二指示信息。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，传输资源包括频域资源和/或时域资源。基于该方法，第二层实体可以为当前SL通信分配进行SL通信所需的传输资源，并通过第二指示信息下发给第一层实体，以便第一层实体能够在该传输资源上进行覆盖增强，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括功控参数，方法还包括：终端的第一层实体采用根据功控参数确定的SL发射功率进行SL通信。基于该方法，第二层实体可以向第一层实体下发包括功控参数的第二指示信息，以便第一层实体能够根据该功控参数调整SL发射功率，以提高SL通信质量。
在一种可能的设计中，第二指示信息包括进行SL通信所需的专用载波信息，专用载波信息用于指示SL专用载波；该方法还包括：终端的第一层实体根据专用载波信息，在SL专用载波上进行SL通信；或，第二指示信息包括切换指示，切换指示用于指示终端切换载波；该方法还包括：终端的第一层实体根据切换指示切换载波。基于该方法，第二层实体通过第二指示信息指示第一层实体将当前SL通信切换到SL专用载波上。示例性的，该SL专用载波可以是预置的，并通过第二指示信息指示第一层实体切换SL通信的载波。该SL专用载波也可以是第二层实体为第一层实体分配的，并通过第二指示信息下发给第一层实体，以便第一层实体切换SL通信的载波。
第十四方面，本申请提供一种通信装置，该通信装置可以为终端或者终端中的芯片或者片上系统。该通信装置可以实现上述第十三方面或者第十三方面中可能的设计中终端所执行的功能，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。硬件或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：第一处理模块，第二处理模块；示例性的，第一处理模块具有终端中第一层实体的功能，例如，第一处理模块具有终端设备中的接入层(Access Stratum，AS层)的功能。第二处理模块具有终端设备中第二层实体的功能，例如，第二处理模块具有终端设备中的PC5-S层、V2X层，以及应用层的功能。
第十五方面，本申请提供了一种通信装置，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该终端执行如上述第十三方面或者第十三方面的任一种可能的设计的通信方法。
第十六方面，本申请提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令运行时，执行上述第十三方面或者第十三方面的任一种可能的设计的通信方法。
第十七方面，本申请提供一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第十三方面或者第十三方面的任一种可能的设计的通信方法。
第十八方面，本申请提供了一种芯片系统，该芯片系统包括处理器、通信接口，用于支持终端实现上述方面中所涉及的功能。在一种可能的设计中，芯片系统还包括存储器，存储器，用于保存终端必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
示例性的，第十四方面至第十八方面中任一种设计方式所带来的技术效果可参见上述第十三方面或者第十三方面的任一种可能的设计所带来的技术效果，此处不再赘述。
第十九方面，本申请提供一种通信系统，该通信系统可以包括一个或多个终端和/或一个或多个网络设备。示例性的，一个或多个终端可以用于执行如上述第一方面，第一方面的任一种可能的设计，第十三方面，或者第十三方面的任一种可能的设计提供的通信方法。一个或多个网络设备可以用于执行上述第七方面或者第七方面的任一种可能的设计的通信方法。
附图说明
图1为现有技术提供的一种SL通信的场景示意图；
图2为现有技术提供的另一种SL通信的场景示意图；
图3为本申请实施例提供的一种网络架构示意图；
图4为本申请实施例提供的另一种网络架构示意图；
图5为本申请提供的一种终端的逻辑组成示意图；
图6为本申请实施例提供的一种通信方法的流程示意图；
图7为本申请实施例提供的另一种通信方法的流程示意图；
图8为本申请实施例提供的一种通信装置的组成示意图；
图9为本申请实施例提供的另一种通信装置的组成示意图；
图10为本申请实施例提供的另一种通信装置的组成示意图；
图11为本申请实施例提供的另一种通信装置的组成示意图；
图12为本申请实施例提供的一种芯片系统的组成示意图；
图13为本申请实施例提供的另一种通信装置的组成示意图；
图14为本申请实施例提供的一种芯片系统的组成示意图。
具体实施方式
为了明确实施例说明中的技术方案，以下对本申请实施例涉及的名词进行解释：
1)、终端，又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音/数据连通性的设备。例如，具有无线连接功能的手持式设备、或车载设备等。目前，一些终端的举例为：车载电脑、手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)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、或智慧家庭(smart home)中的无线终端等。
2)、通用移动通信网络(Universal Mobile Telecommunications System，UMTS)是由第三代合作伙伴计划(The 3rd Generation Partnership Project，3GPP)组织制定的3G移动通信技术标准，而通用移动通信技术的长期演进(Long Term Evolution，LTE)是由3GPP组织制定的UMTS技术标准的长期演进。因为演进关系，我们将LTE接入网部分称为演进的UMTS陆地无线接入网(Evolved UMTS Terrestrial Radio Access Network，E-UTRAN)。对应的，LTE核心网部分可以称为演进的分组核心(Evolved Packet Core，EPC)。区别于3G和4G通信技术标准，将5G接入网部分称为NG-RAN，将5G核心网部分称为5GC。
3)、移动管理实体(Mobility Management Entity，MME)是3GPP协议LTE接入网络的关键控制节点，它负责空闲模式的UE(User Equipment)的定位，传呼过程，包括中继。简单的说MME是负责信令处理部分。服务网关(Serving GateWay，S-GW)是终止于E-UTRAN接口的网关，示例性的，S-GW的主要功能可以包括：进行eNB间切换时，可以作为本地锚定点，并协助完成eNB的重排序功能；在3GPP不同接入网络间切换时，作为移动性锚点，同样具有重排序功能；执行合法侦听功能；进行数据包的路由和前转；在上行和下行传输层进行分组标记；空闲状态下，下行分组缓冲和发起网络触发的服务请求功能；用于运营商间的计费等。
4)、网络设备是无线网络中的设备，例如将终端接入到无线网络的无线接入网(radio access network，RAN)节点。目前，一些RAN节点的举例为：gNB、ng-eNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)、路边单元(Roadside Unit，RSU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。
5)、车辆与其他设备通信：即V2X通信，可以应用于交通运输网络中。V2X通信可以包括车与车(Vehicle to Vehicle，V2V)通信、车与路侧基础设施(Vehicle to Infrastructure，V2I)通信以及车与行人(Vehicle to People，V2P)通信。其中，V2V通信可以在边链路(sidelink)上进行，V2I通信可以在下行链路(Downlink，DL)上进行。
6)、SL通信：基于sidelink的通信。SL通信可以在物理SL控制信道(Pysical Sidelink Control Channel，PSCCH)和/或物理SL共享信道(Pysical Sidelink Share Channel，PSSCH)上传输数据。示例性的，SL通信链路是指终端设备和终端设备之间的无线通信链路，比如可以是V2X通信中，车辆的通信装置和另一车辆的通信装置之间的无线通信链路。
7)、Uu口通信：基于Uu口的终端与网络设备之间的通信，可以包括DL通信。
8)、路损：本申请中涉及SL路损以及DL路损。SL路损为SL通信中，终端与终 端之间的数据传播损耗。DL路损为DL通信中，终端与网络设备之间的数据传播损耗。路损的大小与设备之间的距离成正相关的关系。如终端之间的距离越大，SL路损越大。又如，终端与网络设备(如基站)之间的距离越大，DL路损越大。
9)、SL发射功率：SL通信过程中，终端发起SL通信时采用的发射功率。SL发射功率可以包括PSCCH和/或PSSCH，以及其它SL链路上的信号或者信道的发射功率。
另外，本申请实施例中，“多个”是指两个或两个以上，其它量词与之类似。“和/或”描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，对于单数形式“a”，“an”和“the”出现的元素(element)，除非上下文另有明确规定，否则其不意味着“一个或仅一个”，而是意味着“一个或多于一个”。例如，“a device”意味着对一个或多个这样的device。再者，至少一个(at least one of).......”意味着后续关联对象中的一个或任意组合，例如“A，B和C中的至少一个”包括A，B，C，AB，AC，BC，或ABC。
在V2X通信中，终端在发起SL通信时，首先需要确定SL发射功率。示例性的，可以通过以下公式(1)和公式(2)分别确定PSSCH和PSCCH的发射功率。
P PSSCH＝min{P CMAX,PSSCH,10log 10(M PSSCH)+P 0_PSSCH,1+α PSSCH,1·PL}……公式(1)
其中，P PSSCH为PSSCH的发射功率，P CMAX,PSSCH为预配置的PSSCH上的最大发射功率，M PSSCH为网络设备为PSSCH配置的资源数量，P 0_PSSCH,1为SL通信中接收终端在PSCCH上的期望接收功率，α PSSCH,1为路损补偿系数，PL为路损补偿值。其中，接收终端为SL通信中接收数据的终端。
P PSCCH＝min{P CMAX,PSCCH,10log 10(M PSCCH)+P 0_PSCCH,1+α PSCCH,1·PL}……公式(2)
其中，P PSCCH为PSCCH的发射功率，P CMAX,PSCCH为预配置的PSCCH上的最大发射功率，M PSCCH为网络设备为PSCCH配置的资源数量，P 0_PSCCH,1为SL通信中接收终端在PSSCH上的期望接收功率，α PSCCH,1为路损调整系数，PL为路损补偿值。
可以看到，SL发射功率是需要根据SL通信发起时的路损补偿值以及其他功控参数(如P CMAX，M，P 0或α)确定的。具体采用SL路损还是DL路损对SL发射功率进行补偿，可以根据预先配置的补偿策略确定。
需要说明的是，在本实施例中，采用SL路损对SL发射功率进行补偿，指的是确定SL发射功率时的路损补偿值为SL路损的值。采用DL路损对SL发射功率进行补偿，指的是确定SL发射功率时的路损补偿值为DL路损的值。
示例性的，该补偿策略可以是使用SL路损或者只使用SL路损对SL发射功率进行补偿，还可以是使用DL路损或者只使用DL路损对SL发射功率进行补偿，还可以是SL路损和DL路损均可对SL发射功率进行补偿。为了减小SL通信对Uu口通信的干扰，当补偿策略是SL路损和DL路损均可对SL发射功率进行补偿时，终端会选取根据DL路损计算获取的SL发射功率与根据SL路损计算获取的SL发射功率中较小的SL发射功率，发起SL通信。
这样就可能会出现采用较小的SL发射功率发起SL通信导致的发射功率太小而无法满足通信要求的情况发生。
例如，终端1和终端2处于相同网络设备的覆盖范围内时的情况请参考图1。当 终端1想要向终端2发起SL通信时，如果SL路损大于DL路损，那么终端1至少需要采用根据SL路损补偿获取的SL发射功率发起SL通信，才可以保证满足SL通信的要求。而此时如果为了减小对Uu口通信的干扰而采用根据DL路损补偿获取的SL发射功率发起SL通信，就必然会导致发射功率过小的情况发生。当终端2想要向终端1发起SL通信时，类似的，如果SL路损大于终端2与网络设备之间的DL路损，而如果终端2为了减小对Uu口通信的干扰而采用根据终端2与网络设备之间的DL路损补偿获取的SL发射功率发起SL通信，也会导致发射功率过小的情况发生。
又如，终端1和终端2处于不同网络设备的覆盖范围内时的情况请参考图2。假设终端1处于网络设备1的覆盖范围内，终端2处于网络设备2的覆盖范围内，终端1与网络设备1之间的路损为DL路损1，终端2与网络设备2之间的路损为DL路损2，并且终端1与终端2之间的路损为SL路损。那么，当终端1想要向终端2发起SL通信时，如果SL路损大于DL路损1，而终端1采用根据DL路损1补偿获取的SL发射功率发起SL通信，该SL发射功率就因为过小而不能保证SL通信的要求。类似的，当终端2想要向终端1发起SL通信时，如果SL路损大于DL路损2，而终端2采用根据DL路损2补偿获取的SL发射功率发起SL通信，该SL发射功率也不能保证SL通信的要求。
因此，当SL路损大于DL路损时，就可能会出现SL发射功率过小而导致的SL通信无法达到要求(如SL通信质量差甚至SL通信断开)的情况。
为了解决上述问题，本申请实施例提供一种通信方法，可以有效的保证SL通信质量。
以下结合附图对本申请提供的通信方法进行详细说明。
请参考图3，为本申请实施例提供的一种网络架构示意图。以LTE网络为例，作为一种示例，该网络架构可以包括E-UTRAN和EPC，E-UTRAN用于提供面向终端的E-UTRA用户面和控制面协议终端，EPC用于呼叫信令控制和承载建立。该E-UTRAN可以由一个或多个eNB组成，而EPC可以包括一个或多个S-GW和MME。其中，eNB之间可以通过X2接口相互连接。E-UTRAN中的eNB可以通过S1-MME接口连接到MME，并通过S1-U接口连接到S-GW。
请参考图4，为本申请实施例提供的另一种网络架构示意图。以5G网络为例，作为一种示例，该网络架构可以包括由一个或多个gNB和/或一个或多个ng-eNB组成的NG-RAN，以及由一个或多个接入和移动管理功能实体(Core Access and Mobility Management Function，AMF)和/或一个或多个用户计划功能实体(User plane Function，UPF)组成的5GC。其中，gNB可以提供面向终端的新空口(New Radio，NR)用户平面和控制平面协议终端，ng-eNB提供面向终端的E-UTRA用户平面和控制平面协议终端。gNB与ng-NB之间可以通过Xn接口互相连接，gNB与ng-NB都可以通过NG接口连接到5GC。
请参考图5，为本申请提供的一种终端的逻辑组成示意图。该终端至少包括第一层实体和第二层实体。第一层实体可以是接入层(AS层)，或者接入层内的具体协议层，比如RRC层，第二层实体可以是PC5-S层，V2X层，或者应用层。其中，作为一种示例，如图5所示，终端可以包括第一层实体和第二层实体，其中第一层实体可以 包括AS层，第二层实体可以包括PC5-S层，V2X层，以及应用层。
示例性的，AS层可以是进行无线空口接入相关的协议层，如RRC，PDCP，RLC,MAC，PHY层等。PC5-S层可以是PC5口的信令协议层，能够用于完成PC5口的连接建立。V2X层可以是是V2X相关的管理协议实体。示例性的，V2X层数据面的功能包括，把3GPP协议层之前的数据映射到3GPP协议能够处理的数据，供3GPP协议层处理。其中，PC5-S层可以是PC5口的信令协议层，能够用于完成PC5口的连接建立。在一些实施例中，PC5-S层可以是V2X层的一个子集，例如，PC5-S层可以是V2X层的控制面协议。
在本申请实施例中，AS层可以用于与其他终端进行SL通信。在该终端进行SL通信的过程中，AS层还可用于获取该终端与其他终端之间的SL路损，及该终端与网络设备之间的DL路损。在一些情况下，AS层还可以用于判断SL路损与DL路损的大小关系。AS层还可用于向V2X层上报第一指示信息，该第一指示信息可以包括AS层实体获取的SL路损和/或DL路损，第一指示信息还可以包括AS层判断SL路损与DL路损的大小关系。
V2X层可以用于处理AS层上报的信息，如该信息可以是AS层上报的上述第一指示信息。V2X层还可以确定并向AS层下发信息，用于AS层根据该信息进行SL通信。在一些情况下，V2X层可以预先存储有进行SL通信的传输资源或者功控参数或者SL专用载波等信息，SL专用载波可以是V2X专用载波。
需要说明的是，图5所示终端的逻辑组成及层的命名(如AS层，V2X层等)仅是本实施例提供的一种示例。在另一些实施例中，终端的逻辑组成可包括比图示更多或更少的层，层也可以采用其他命名。
本申请实施例提供的通信方法均可基于如图5所示的终端实现。本申请实施例提供的通信方法可应用于V2X通信中。用于支持V2X通信的网络可以为任意移动通信网络，如，图3或图4所示的网络。另外，本实施例的技术方案可应用于V2X通信的任意场景中，如，图1或图2所示的场景。
为了更加清楚的对本申请实施例进行说明，以下示例均以终端被配置为SL路损和DL路损均可对SL发射功率进行补偿，且发射功率采用根据以上两种路损补偿获得的较小的发射功率发起SL通信的情况进行说明。
请参考图6，为本申请实施例提供的一种通信方法的流程示意图。该方法可以包括S601-S604。
S601、终端向网络设备发送第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系。
示例性的，该第一指示信息中包括的SL路损，可以是SL路损的值，或者可以反映SL路损的测量值，比如信道的RSRP(Reference Signal Receiving Power,参考信号接收功率)或者RSRQ(Reference Signal Receiving Quality，参考信号接收质量)等值。第一指示信息中包括的DL路损，可以是DL路损的值，或者可以反映SL路损的测量值，比如信道的RSRP或者RSRQ等值。第一指示信息中包括的SL路损与DL路损的大小关系可以是SL路损的值与DL路损的值的大小关系，如SL路损大于DL路损或DL路损大于SL路损。
可以理解的是，当SL路损大于DL路损时，为了减小对Uu口通信的干扰，终端会 采用DL路损补偿获取的SL发射功率发起SL通信。这样就可能会出现SL发射功率不足以进行SL通信的情况，那么终端就可以将该情况发送给网络设备。
本申请实施例中，终端可以在预设条件被触发时向网络设备发送第一指示信息。
在一些实施例中，终端可以在确定SL路损大于第一值时，向网络设备发送第一指示信息。其中，第一值可以为DL路损，也可以为根据DL路损确定的值，如第一值等于DL路损减去预设阈值。
在其他一些实施例中，终端可以设置定时器。终端可以控制该定时器从终端第一次确定SL路损大于第二值起开始计时，如果在定时器计时结束之前(即在预设时间内)，确定SL路损始终大于DL路损，以此便确定SL路损大于DL路损的情况是真实稳定出现的，那么终端就可以在定时器结束计时向网络设备发送第一指示信息。其中，第二值可以为DL路损，也可以为根据DL路损确定的值，如第二值等于DL路损减去预设阈值。
在另外一些实施例中，终端可以对无线链路失败(RLF)的发生进行监听，当终端确定RLF发生，并且该RLF发生的原因是SL路损大于第三值时，那么终端就可以向网络设备发送第一指示信息，向网络指示RLF发生的原因，比如，是SL路损大于第三值。其中，第三值可以为DL路损，也可以为根据DL路损确定的值，如第三值等于DL路损减去预设阈值。
需要说明的是，在上述示例中，第一值、第二值与第三值，可以相同，也可以不同。由于SL路损和DL路损会随着终端之间的相对位置的变化以及终端与网络设备之间相对位置的变化而改变，因此，为了更够更加准确及时的发送第一指示信息，终端可以适当提前发送第一指示信息的时间。因此，上述第一值、第二值及第三值可以不等于DL路损，而是小于该DL路损。
本申请实施例中，在提供如上述几种根据预设条件发送第一指示信息的方法之外，还提供其他的发送第一指示信息的方法。例如，终端可以在确定满足上述预设条件中的任一个条件，且在确定在发起SL通信时采用的是根据DL补偿获得的SL发射功率时(比如，根据配置，和SL路损和DL路损对比关系，选择DL路损作为SL发射功率计算)，再向网络设备发送第一指示信息。又例如，终端可以按照预设的周期，周期性地向网络设备发送第一指示信息。
S602、网络设备接收来自终端的第一指示信息。
网络设备接收到来自终端的第一指示信息，就能够获知终端进行SL通信的参数，如，SL路损，DL路损和SL路损与DL路损的大小关系中的至少一个。基于这些参数，网络设备就能够确定终端是否会出现SL发射功率过小的情况。如果确定终端会出现SL发射功率过小的情况，则执行以下S603。
示例性的，在一些实施例中，网络设备可以在确定SL路损大于第一值时，确定终端会出现SL发射功率过小的情况。第一值是DL路损或根据DL路损确定的值。
在另一些实施例中，网络设备可以在确定SL路损在预设时间内始终大于第二值时，确定终端会出现SL发射功率过小的情况。第二值是DL路损或根据DL路损确定的值。这样网络设备就能够确定SL路损大于第二值是一个持续的过程，进而避免某个时刻的参数异常导致的判断不准确的问题。
示例性的，网络设备中可以设置定时器，在网络设备接收到第一指示信息，并且确定SL路损大于第二值后，定时器开始计时。如果从定时器开始计时到定时器结束计时为止，网络设备基于一个或多个接收到的第一指示信息确定SL路损一直大于第二值，那么网络设备就可以确定SL路损大于第二值为真实稳定出现的，以便网络设备可以更加准确的确定当前SL通信是否存在SL发射功率过小的问题。
需要说明的是，在上述示例中，第一值与第二值可以相同，也可以不同。
由于第一指示信息中可以只包括SL路损或DL路损，因此网络设备还可以从其他信息中获取DL路损或SL路损，以便网络设备确定终端是否会出现SL发射功率过小的情况。
例如，如果第一指示信息中包括SL路损的值，网络设备可以从其他信息中获取DL路损的值，以便网络设备能够确定终端是否会出现SL发射功率过小的情况。
又如，如果第一指示信息中包括DL路损的值，网络设备可以从其他信息中获取SL路损的值，以便网络设备能够确定终端是否会出现SL发射功率过小的情况。
又如，如果第一指示信息中包括SL路损与DL路损的大小关系，网络设备可以直接根据该大小关系，确定终端是否会出现SL发射功率过小的情况。或者，网络设备可以从其他信息中获取DL路损和SL路损的值，并确定SL路损与第一值或第二值的大小关系，同时与第一指示信息中的大小关系进行对比，最终确定终端是否会出现SL发射功率过小的情况。
S603、网络设备向终端发送第二指示信息，第二指示信息用于终端进行SL通信。
结合S602中的说明，网络设备可以基于第一指示信息判断当前SL通信是否存在SL发射功率过小的问题。当网络设备确定当前SL通信存在SL发射功率过小的问题，那么网络设备可以判断是否要采取措施来保证该SL通信的进行。
示例性的，网络设备可以根据当前SL通信的业务情况(如业务优先级)，确定是否采取相应的措施保证该SL通信的进行(即提高该SL通信质量)。例如，当前SL通信的业务优先级较低，那么网络设备就可以确定不需要采取相应的措施保证该SL通信的进行。又例如，当前SL通信的业务优先级很高(如终端需要通过该SL通信发送重要数据)，那么网络设备就可以确定要采取相应的措施保证该SL通信的进行。例如，保证SL通信正常进行的措施可以包括启用频域和/或时域覆盖增强、调整功控参数以及切换通信载波等。如，本申请实施例中，网络设备可以向终端发送包括对应措施的第二指示信息，以便终端可以根据该第二指示信息进行SL通信，达到保证SL通信正常进行的目的。
示例性的，在本申请的一些实施例中，网络设备可以启动覆盖增强技术，并将覆盖增强技术相关的措施通过第二指示信息发送给终端。
例如，覆盖增强技术可以包括频域覆盖增强。网络设备可以向终端分配更多的频域资源，并将该频域资源携带在第二指示信息发送给终端，以便终端在没有达到最大发射功率时，可以在网络设备分配的更多的频域资源上将要发送的数据进行重复传输，以实现覆盖增强。
又如，覆盖增强技术可以包括时域覆盖增强。网络设备可以为终端分配更多的时域资源，并将该时域资源携带在第二指示信息发送给终端，以便终端可以在网络设备 分配的更多的时域资源上对将要发送的数据进行重复传输，以实现覆盖增强。
需要说明的是，本申请实施例中的频域覆盖增强和时域覆盖增强，可以是在更多的资源上进行重复发送，也可以是利用跳频、波束成型等方法来实现覆盖增强。
又如，覆盖增强技术可以包括对SL发射功率的调整。网络设备可以调整功控参数(如公式(1)和公式(2)中的P 0和/或α)，并将该功控参数通过第二指示信息发送给终端，以便终端可以根据调整后的功控参数重新计算获取SL发射功率以提高SL通信质量。
另外，在使用以上示例中的覆盖增强技术(如频域覆盖增强、时域覆盖增强以及调整功控参数)时，可以选择其中一种技术以提高SL通信质量，也可以选择任意两种或多种技术以提高SL通信质量，本申请实施例在此不作限制。
需要说明的是，在一些实施例中，用于覆盖增强的频域资源、时域资源以及功控参数，可以是网络设备在确定启动覆盖增强技术之后为终端分配的，如上述示例中向终端发送的第二指示信息中可以包括网络设备为终端分配的频域资源、时域资源和功控参数中的一种或多种。
在另一些实施例中，用于覆盖增强的频域资源、时域资源以及功控参数，也可以是预先配置在终端中的。示例性的，第二指示信息中可以包括用于指示终端使用预置的资源(如频域资源、时域资源或功控参数)进行覆盖增强的信息，以便终端能够根据该第二指示信息进行覆盖增强。
本申请实施例提供的通信方法中，网络设备还可以采用载波切换的方法提高SL通信质量。示例性的，在一些实施例中，网络设备可以向终端发送包括专用载波信息的第二指示信息，该专用载波信息可以包括网络为终端分配的SL专用载波资源，或者V2X专用载波资源，以指示终端将当前共享载波上的SL通信切换到专用载波信息中指示的SL专用载波或者V2X专用载波上进行SL通信。在另一些实施例中，SL专用载波或者V2X专用载波资源也可以是预配置在终端中的。网络设备可以将包括切换指示的第二指示信息发送给终端，以便终端根据该切换指示将当前SL通信切换到预先配置好的SL专用载波或者V2X专用载波上进行通信。
在另一些实施例中，如果当前传输资源紧张并且该SL通信并非必要，网络设备也可以确定断开当前SL通信，以释放被占用的资源。那么，网络设备就可以向终端发送包括中断指示的第二指示信息，以便指示终端断开当前SL通信。
S604、终端接收来自网络设备的第二指示信息，第二指示信息用于终端进行SL通信。
结合S603中的示例，终端可以根据来自网络设备的第二指示信息执行对应的方案，对当前SL通信进行调整，以便提高当前SL通信质量或者断开SL通信。
示例性的，在一些实施例中，第二指示信息可以包括SL通信所需的频域资源和/或时域资源。终端可以将要传输的数据在该频域资源和/或时域资源上重复传输，以保证接收端终端能够准确地接收到该数据。其中，终端在进行上述频域覆盖增强和/或时域覆盖增强时，采用的SL发射功率可以与之前的SL发射功率相同(如根据DL路损补偿获取的SL发射功率)，也可以不同。具体的SL发射功率的选择，可以根据实施过程中的实际情况灵活设置。
在另一些实施例中，第二指示信息可以包括功控参数。终端可以根据第二指示信息中包括的调整后的功控参数重新计算SL发射功率进行SL通信。其中，终端在根据功控参数重新获取SL发射功率时，可以采用DL路损对SL发射功率进行补偿，也可以采用SL路损对SL发射功率进行补偿。
在另一些实施例中，第二指示信息可以包括专用载波信息，终端可以将当前SL通信切换到该专用载波信息指示的SL专用载波或者V2X专用载波上进行通信。或者，当SL专用载波或者V2X专用载波已经被提前配置在终端中时，第二指示信息可以包括切换指示，那么终端就可以根据该切换指示将当前SL通信切换到预先配置好的SL专用载波或者V2X专用载波上进行通信。
需要说明的是，由于在SL专用载波或者V2X专用载波上进行的SL通信不会对Uu口通信产生干扰，因此，在切换载波的同时，终端可以采用更高的发射功率进行SL通信(如采用根据SL路损补偿获取的SL发射功率发起SL通信)，以便提高SL通信质量。
在另一些实施例中，第二指示信息可以包括中断指示，终端可以在接收到第二指示信息之后断开当前SL通信，以便释放当前SL通信占用的资源。
本申请另一些实施例中，网络设备在接收到终端的第一指示信息之后，可以在确定终端存在SL发射功率过小的问题时，便向终端发送第二指示信息，也可以等待一定时间后再向终端发送第二指示信息。示例性的，网络设备在接收到终端发送的第一指示信息，确定终端存在SL发射功率过小的问题之后，如果当前网络资源紧张，没有更多的资源可以提供给终端进行覆盖增强或者切换V2X专用载波，那么网络设备就可以在等待有空闲资源后再向终端发送第二指示信息。在这段等待时间内，终端可以继续执行当前SL通信，在接收到第二指示信息之后，终端就可以根据第二指示信息进行SL通信。
需要说明的是，上述示例中的方法，可以应用于终端被配置为可以自行选择SL路损或DL路损补偿获取SL发射功率的场景下，也可以应用于其他场景。例如，终端被配置为使用DL路损补偿获取的SL发射功率进行SL通信。在该场景下，如果终端可以向网络设备发送第一指示信息，网络设备可以基于该第一指示信息确定SL路损大于DL路损或根据DL路损确定的值，并向终端发送第二指示信息，用于指示终端将上述策略重配为使用SL路损补偿获取的SL发射功率进行SL通信。详细的执行过程请参考图6，此处不再赘述。
这样，终端通过第一指示信息将SL通信过程中的路损情况发送给网络设备，网络设备就能够知晓当前SL通信的状态(如SL通信质量的好坏，是否有断开连接的问题等)。网络设备基于第一指示信息确定需要保证当前SL通信时，就可以向终端发送第二指示信息，用于指示终端通过覆盖增强、调整功控参数和/或切换载波等方法提高当前SL通信的质量，保证SL通信的正常进行。
本申请的又一实施例提供一种通信方法，终端的第一层实体可以向终端的第二层实体发送当前SL通信的相关参数，以便终端的第二层实体确定对当前SL通信进行调整，并指示终端的第一层实体执行对应的SL通信，以解决SL路损大于DL路损时可能导致的SL通信质量无法得到保证的问题。
请参考图7，为本申请实施例提供的另一种通信方法的流程示意图。如图7所示，该方法可以包括S701-S702。
S701、终端的第一层实体向终端的第二层实体发送第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系。
类似于S601中的示例，在一些实施例中，终端的第一层实体(如AS层)可以在预设条件被触发时向终端的第二层实体(如V2X层)发送第一指示信息。例如，AS层确定SL路损大于第一值，向V2X层发送第一指示信息，第一值是DL路损或根据DL路损确定；或，AS层确定SL路损在预设时间内始终大于第二值，向V2X层发送第一指示信息，第二值是DL路损或根据DL路损确定；或，AS层在确定RLF，SL路损大于第三值时，向V2X层发送第一指示信息，第三值是DL路损或根据DL路损确定。
在另一些实施例中，终端的第一层实体(如AS层)也可以按照预设的周期，向终端的第二层实体(如V2X层)周期性地发送第一指示信息。
S702、终端的第二层实体向终端的第一层实体发送第二指示信息，第二指示信息用于终端进行SL通信。
类似于S602中的说明，终端的第二层实体可以基于接收到的第一指示信息确定当前SL通信是否存在SL发射功率偏小的问题。
示例性的，在一些实施例中，V2X层可以基于第一指示信息确定SL路损是否大于第一值。该第一值可以是根据DL路损确定的值，也可以是DL路损。如果SL路损大于第一值，那么可确定当前SL通信就存在SL发射功率的问题。在另一些实施例中，V2X层可以基于第一指示信息确定SL路损在预设时间内是否始终大于第二值，第二值是DL路损或根据DL路损确定。如果SL路损在预设时间内一直大于第二值，那么可确定当前SL通信就存在SL发射功率较小的问题。
可选的，在上述条件的基础上，V2X层可以确定当前SL通信的SL发射功率是采用DL路损进行补偿获取的，从而明确当前SL通信存在SL发射功率较小的问题。
本申请实施例中，由于第一指示信息中可能不同时包括SL路损与DL路损，因此V2X层还可以根据其他信息确定DL路损或SL路损，进而判断当前SL通信是否存在SL发射功率偏小的问题。
V2X层在确定当前SL通信存在SL发射功率过小的问题后，可以判断是否需要采取相应的措施来保证该SL通信。示例性的，V2X层可以根据当前SL通信的业务情况(如业务优先级)，确定是否采取相应的措施保证该SL通信的进行。例如，当前SL通信的业务优先级很高，那么网络设备就可以确定要采取相应的措施保证该SL通信的进行。
当V2X层确定要采取相应的措施保证该SL通信继续进行时，可以确定对应的措施并通过第二指示信息将该措施的指示发送给AS层，以进行SL通信。
示例性的，在一些实施例中，第二指示信息可以包括进行SL通信所需的传输资源(如可以用于进行覆盖增强的频域资源和/或时域资源)，以便AS层能够在该传输资源上进行频域和/或时域覆盖增强。
在另一些实施例中，第二指示信息可以包括功控参数，以便AS层能够根据该功控参数重新计算SL发射功率进行SL通信。
在另一些实施例中，第二指示信息包括进行SL通信所需的专用载波信息，专用载波信息可以指示V2X专用载波，以便AS层能够将SL通信切换到V2X专用载波上进行通信。或者，第二指示信息可以包括切换指示，以便AS层能够将SL通信切换到预先设置的V2X专用载波上进行通信。
需要说明的是，上述覆盖增强的资源，或者SL/V2X专用载波信息，或者功控参数信息，可以是预配置在V2X层中的，也可以是V2X层预先从网络获取的。
如果V2X层根据当前SL通信的业务情况确定不需要采取相应的措施保证该SL通信继续进行，那么V2X层就可以向终端发送包括中断指示的第二指示信息，以便AS断开当前SL通信，释放占用的资源。
本实施例提供的方法的详细描述可以参考图6的相关步骤中的具体描述，此处不再赘述。
需要说明的是，本申请实施例提供的方法，终端可以通过V2X层确定是否要采取对应的措施来提高当前SL通信的质量，并将对应的措施发送给AS层执行。这些措施采用的资源(如进行覆盖增强的频域资源以及时域资源，又如调整SL发射功率的功控参数，又如V2X专用载波资源)可以是预置在V2X层中的，当V2X层确定需要执行保证SL通信的进行，那么就可以将这些预置的措施发送给AS层。
这样，终端的AS层将当前SL通信的参数(如SL路损、DL路损以及SL路损与DL路损的大小关系中的一个或多个)发送给V2X层，以便V2X层可通过第二指示信息指示AS层进行相应的措施以保证当前SL通信的通信质量，也就解决了SL路损大于DL路损时可能导致的SL通信质量无法保证的问题。可以看到，本申请实施例提供的方法，终端通过V2X层与AS层之间的交互，可保证SL通信质量，并不需要与网络设备进行交互，因此该实施例可以应用于终端无法与网络设备进行交互的场景下。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，上述终端和网络设备为了实现上述功能，其包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，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。
本申请实施例可以根据上述方法示例对终端和网络设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。可选的，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图8示出了的一种通信装置800的组成示意图，该通信装置800可以为终端或者终端中的芯片或者片上系统，该通信装置800可以用于执行上述实施例中涉及的终端的功能。作为一种可实现方式，图8所示通信装置800包括：发送模块801和接收模块802。
发送模块801可以用于向终端之外的其他设备发送数据或信息，例如发送模块801 可以用于向网络设备发送第一指示信息。示例性的，发送模块801可以用于执行如图6所示的S601。
接收模块802可以用于接收终端之外的其他设备发送的数据或信息，例如接收模块802可以用于接收来自网络设备的第二指示信息。示例性的，接收模块802可以用于执行如图6所示的S604。
在一种可能的设计中，发送模块801具体用于在确定SL路损大于第一值时，向网络设备发送第一指示信息，第一值是DL路损或根据DL路损确定；或，发送模块801具体用于在确定SL路损在预设时间内始终大于第二值时，向网络设备发送第一指示信息，第二值是DL路损或根据DL路损确定；或，发送模块801具体用于在确定RLF，SL路损大于第三值时，向网络设备发送第一指示信息，第三值是DL路损或根据DL路损确定。
在一种可能的设计中，发送模块801具体用于周期性地向网络设备发送第一指示信息。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，传输资源包括频域资源和/或时域资源。
在一种可能的设计中，第二指示信息包括功控参数，以便通信装置800采用根据功控参数确定的SL发射功率进行SL通信。
在一种可能的设计中，第二指示信息包括进行SL通信所需的专用载波信息，专用载波信息用于指示SL专用载波。以便通信装置800根据专用载波信息，在SL专用载波上进行SL通信。或者，第二指示信息包括切换指示，以便通信装置800根据切换指示切换载波。
需要说明的是，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。本申请实施例提供的通信装置，用于执行上述通信方法中终端的功能，因此可以达到与上述通信方法相同的效果。作为可选而不是必须，可以理解的是，必要时，本申请实施例提供的通信装置可以包括用于支持上述发送模块801和/或接收模块802完成相应功能的处理模块或者控制模块。
图9示出了的一种通信装置900的组成示意图，该通信装置900可以为网络设备中的芯片或者片上系统，该通信装置900可以用于执行上述实施例中涉及的网络设备的功能，作为一种可实现方式，图9所示通信装置900包括：接收模块901和发送模块902。
接收模块901，可以用于接收来自终端的第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系。示例性的，接收模块901可以用于执行如图6所示的S602。
发送模块902，可以用于向终端发送第二指示信息，第二指示信息用于指示终端进行SL通信。示例性的，发送模块902可以用于执行如图6所示的S603。
在一种可能的设计中，发送模块902具体用于在确定SL路损大于第一值时，向终端发送第二指示信息，第一值是DL路损或根据DL路损确定。或，发送模块902具体用于在确定SL路损在预设时间内始终大于第二值时，向终端发送第二指示信息，第二值是DL路损或根据DL路损确定。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，该传输资源包括频域资源和/或时域资源。
在一种可能的设计中，第二指示信息包括功控参数。
在一种可能的设计中，第二指示信息包括专用载波信息，专用载波信息用于指示SL专用载波。或，第二指示信息包括切换指示，切换指示用于指示终端切换载波。
需要说明的是，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。本申请实施例提供的通信装置，用于执行上述通信方法中网络设备的功能，因此可以达到与上述通信方法相同的效果。作为可选而不是必须，可以理解的是，必要时，本申请实施例提供的通信装置可以包括用于支持上述发送模块902和/或接收模块901完成相应功能的处理模块或者控制模块。
图10示出了的另一种通信装置1000的组成示意图，该通信装置1000可以为终端中的芯片或者片上系统，该通信装置1000可以用于执行上述实施例中涉及的网络设备的功能，作为一种可实现方式，图10所示通信装置1000包括：第一处理模块1001和第二处理模块1002。
示例性的，第一处理模块1001具有上述终端中的第一层实体(如AS层)的功能，第二处理模块1002具有上述终端中的第二层实体(如PC5-S层、V2X层以及应用层)的功能，如：第一处理模块1001可以包括如图5所示的终端中的AS层，第二处理模块1002可以包括如图5所示的终端中的PC5-S层、V2X层以及应用层。
第一处理模块1001可以用于向第二处理模块1002发送第一指示信息，第一指示信息包括以下至少一种：SL路损，DL路损，SL路损与DL路损的大小关系。示例性的，第一处理模块1001可以用于执行如图7所示的S701。
第二处理模块1002可以用于向第一处理模块1001发送第二指示信息，第二指示信息用于终端进行SL通信。示例性的，第二处理模块1002可以用于执行如图7所示的S702。
在一种可能的设计中，第一处理模块1001具体用于在确定SL路损大于第一值时，向第二处理模块1002发送第一指示信息，第一值是DL路损或根据DL路损确定。或，第一处理模块1001具体用于在确定SL路损在预设时间内始终大于第二值时，向第二处理模块1002发送第一指示信息，第二值是DL路损或根据DL路损确定。或，第一处理模块1001具体用于在确定RLF，SL路损大于第三值时，向第二处理模块1002发送第一指示信息，第三值是DL路损或根据DL路损确定。
在一种可能的设计中，第一处理模块1001具体用于周期性地向第二处理模块1002发送第一指示信息。
在一种可能的设计中，第二处理模块1002具体用于在确定SL路损大于第一值时，向第二处理模块1002发送第二指示信息，第一值是DL路损或根据DL路损确定。或，第二处理模块1002具体用于在确定SL路损在预设时间内始终大于第二值时，向第二处理模块1002发送第二指示信息，第二值是DL路损或根据DL路损确定。
在一种可能的设计中，第二指示信息包括进行SL通信所需的传输资源，传输资源包括频域资源和/或时域资源。
在一种可能的设计中，第二指示信息包括功控参数，第一处理模块1001还用于采 用根据功控参数确定的SL发射功率进行SL通信。
在一种可能的设计中，第二指示信息包括进行SL通信所需的专用载波信息，专用载波信息用于指示SL专用载波。第一处理模块1001还用于根据专用载波信息，在SL专用载波上进行SL通信。或，第二指示信息包括切换指示，切换指示用于指示终端切换载波。第一处理模块1001还用于根据切换指示切换载波。
需要说明的是，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。本申请实施例提供的通信装置，用于执行上述通信方法中终端的功能，因此可以达到与上述通信方法相同的效果。作为可选而不是必须，可以理解的是，本申请实施例中第一处理模块1001和第二处理模块1002，其功能可以分别由独立的硬件模块实现，或者分别由独立的软件模块实现，也可以由共同的硬件处理平台执行程序指令的方式来实现。
图11示出了的另一种通信装置1100的组成示意图。该通信装置1100可以包括：处理器1101和存储器1102。该存储器1102用于存储计算机执行指令。示例性的，在一些实施例中，当该处理器1101执行该存储器1102存储的指令时，可以使得该通信装置1100执行如图6所示的S601和/或S604，以及终端需要执行的其他操作。在另一些实施例中，当该处理器1101执行该存储器1102存储的指令时，可以使得该通信装置1100执行如图7所示的S701和/或S702，以及终端需要执行的其他操作。
图12示出了的一种芯片系统1200的组成示意图。该芯片系统1200可以包括：处理器1201和通信接口1202，用于支持终端实现上述实施例中所涉及的功能。示例性的，在一些实施例中，处理器1201可以通过通信接口1202与终端之外的其他设备(如网络设备)进行通信。例如，处理器1201通过通信接口1202向终端之外的其他设备(如网络设备)发送第一指示信息。又如，处理器1201通过通信接口1202接收终端之外的其他设备(如网络设备)发送的第二指示信息。在另一些实施例中，处理器1201可以通过通信接口1202实现终端内不同协议层之间的通信。在一种可能的设计中，芯片系统还包括存储器，用于保存终端必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
图13示出了的另一种通信装置1300的组成示意图。该通信装置1300可以包括：处理器1301和存储器1302。该存储器1302用于存储计算机执行指令。示例性的，当该处理器1301执行该存储器1302存储的该计算机执行指令时，可以使得该通信装置1300执行如图6所示的S602和/或S603，以及网络设备需要执行的其他操作。
图14示出了的一种芯片系统1400的组成示意图。该芯片系统1400可以包括：处理器1401和通信接口1402，用于支持网络设备实现上述实施例中所涉及的功能。示例性的，处理器1401可以通过通信接口1402与网络设备之外的其他设备(如终端)进行通信。例如，处理器1401通过通信接口1402向网络设备之外的其他设备(如终端)发送第二指示信息。又如，处理器1401通过通信接口1402接收从网络设备之外的其他设备(如终端)发送的第一指示信息。在一种可能的设计中，芯片系统还包括存储器，用于保存终端必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器件。
本申请实施例还提供一种通信系统，该通信系统可以包括一个或多个终端和/或一 个或多个网络设备。示例性的，一个或多个终端可以用于执行如图6所示的S601和/或S604，或者用于执行如图7所示的S701和/或S702，以及终端所要执行的其他操作。一个或多个网络设备可以用于执行如图6所示的S602和/或S603，以及网络设备在V2X通信中所要执行的其他操作。
需要说明的是，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。本申请实施例提供的通信装置，用于执行上述通信方法中终端的功能，因此可以达到与上述通信方法相同的效果。
在上述实施例中的功能或动作或操作或步骤等，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。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，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。所述计算机指令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，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(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括一个或多个可以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，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包括这些改动和变型在内。

Claims (25)

  1. 一种通信方法，其特征在于，所述方法包括：
    终端向网络设备发送第一指示信息，所述第一指示信息包括以下至少一种：边链路SL路损，下行链路DL路损，所述SL路损与所述DL路损的大小关系；
    所述终端接收来自所述网络设备的第二指示信息，所述第二指示信息用于指示所述终端进行SL通信。
  2. 根据权利要求1所述的方法，其特征在于，所述终端向网络设备发送第一指示信息，包括：
    所述终端在确定所述SL路损大于第一值时，向所述网络设备发送所述第一指示信息，所述第一值是所述DL路损或根据所述DL路损确定；或，
    所述终端在确定所述SL路损在预设时间内始终大于第二值时，向所述网络设备发送所述第一指示信息，所述第二值是所述DL路损或根据所述DL路损确定；或，
    所述终端在确定无线链路失败RLF，所述SL路损大于第三值时，向所述网络设备发送所述第一指示信息，所述第三值是所述DL路损或根据所述DL路损确定。
  3. 根据权利要求1所述的方法，其特征在于，所述终端向网络设备发送第一指示信息，包括：
    所述终端周期性地向所述网络设备发送所述第一指示信息。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述第二指示信息包括进行SL通信所需的传输资源，所述传输资源包括频域资源和/或时域资源。
  5. 根据权利要求1-3中任一项所述的方法，其特征在于，所述第二指示信息包括功控参数，所述方法还包括：
    所述终端采用根据所述功控参数确定的SL发射功率进行SL通信。
  6. 根据权利要求1-3中任一项所述的方法，其特征在于，
    所述第二指示信息包括进行SL通信所需的专用载波信息，所述专用载波信息用于指示SL专用载波；所述方法还包括：所述终端根据所述专用载波信息，在所述SL专用载波上进行SL通信；
    或，
    所述第二指示信息包括切换指示；所述方法还包括：所述终端根据所述切换指示切换载波。
  7. 一种通信方法，其特征在于，所述方法包括：
    网络设备接收来自终端的第一指示信息，所述第一指示信息包括以下至少一种：边链路SL路损，下行链路DL路损，所述SL路损与所述DL路损的大小关系；
    所述网络设备向所述终端发送第二指示信息，所述第二指示信息用于指示所述终端进行SL通信。
  8. 根据权利要求7所述的方法，其特征在于，所述网络设备向所述终端发送第二指示信息，包括：
    所述网络设备在确定所述SL路损大于第一值时，向所述终端发送所述第二指示信息，所述第一值是所述DL路损或根据所述DL路损确定；或，
    所述网络设备在确定所述SL路损在预设时间内始终大于第二值时，向所述终端发 送所述第二指示信息，所述第二值是所述DL路损或根据所述DL路损确定。
  9. 根据权利要求7或8所述的方法，其特征在于，所述第二指示信息包括进行SL通信所需的传输资源，所述传输资源包括频域资源和/或时域资源。
  10. 根据权利要求7或8所述的方法，其特征在于，所述第二指示信息包括功控参数。
  11. 根据权利要求7或8所述的方法，其特征在于，所述第二指示信息包括专用载波信息，所述专用载波信息用于指示SL专用载波；或，
    所述第二指示信息包括切换指示，所述切换指示用于指示所述终端切换载波。
  12. 一种通信方法，其特征在于，所述方法包括：
    终端的第一层实体向所述终端的第二层实体发送第一指示信息，所述第一指示信息包括以下至少一种：边链路SL路损，下行链路DL路损，所述SL路损与所述DL路损的大小关系；
    所述终端的第二层实体向所述终端的第一层实体发送第二指示信息，所述第二指示信息用于指示所述终端进行SL通信。
  13. 根据权利要求12所述的方法，其特征在于，所述终端的第一层实体向所述终端的第二层实体发送第一指示信息，包括：
    所述终端的第一层实体在确定所述SL路损大于第一值时，向所述终端的第二层实体发送所述第一指示信息，所述第一值是所述DL路损或根据所述DL路损确定；或，
    所述终端的第一层实体在确定所述SL路损在预设时间内始终大于第二值时，向所述终端的第二层实体发送所述第一指示信息，所述第二值是所述DL路损或根据所述DL路损确定；或，
    所述终端的第一层实体在确定无线链路失败RLF，所述SL路损大于第三值时，向所述终端的第二层实体发送所述第一指示信息，所述第三值是所述DL路损或根据所述DL路损确定。
  14. 根据权利要求12所述的方法，其特征在于，所述终端的第一层实体向所述终端的第二层实体发送第一指示信息，包括：
    所述终端的第一层实体周期性地向所述终端的第二层实体发送所述第一指示信息。
  15. 根据权利要求12-14中任一项所述的方法，其特征在于，所述终端的第二层实体向所述终端的第一层实体发送第二指示信息，包括：
    所述终端的第二层实体在确定所述SL路损大于第一值时，向所述终端的第一层实体发送所述第二指示信息，所述第一值是所述DL路损或根据所述DL路损确定；或，
    所述终端的第二层实体在确定所述SL路损在预设时间内始终大于第二值时，向所述终端的第一层实体发送所述第二指示信息，所述第二值是所述DL路损或根据所述DL路损确定。
  16. 根据权利要求12-15中任一项所述的方法，其特征在于，所述第二指示信息包括进行SL通信所需的传输资源，所述传输资源包括频域资源和/或时域资源。
  17. 根据权利要求12-15中任一项所述的方法，其特征在于，所述第二指示信息包括功控参数，所述方法还包括：
    所述终端的第一层实体采用根据所述功控参数确定的SL发射功率进行SL通信。
  18. 根据权利要求12-15中任一项所述的方法，其特征在于，
    所述第二指示信息包括进行SL通信所需的专用载波信息，所述专用载波信息用于指示SL专用载波；所述方法还包括：所述终端的第一层实体根据所述专用载波信息，在所述SL专用载波上进行SL通信；
    或，
    所述第二指示信息包括切换指示，所述切换指示用于指示所述终端切换载波；所述方法还包括：所述终端的第一层实体根据所述切换指示切换载波。
  19. 根据权利要求12-18中任一项所述的方法，其特征在于，
    所述终端的第一层实体为接入AS层；
    所述终端的第二层实体为V2X层。
  20. 一种通信装置，其特征在于，所述通信装置被配置为实现如权利要求1-6，或权利要求12-19任一项所述的通信方法。
  21. 一种通信装置，其特征在于，所述通信装置包括一个或多个处理器和一个或多个存储器；所述一个或多个存储器与所述一个或多个处理器耦合，所述一个或多个存储器存储有计算机指令；
    当所述一个或多个处理器执行所述计算机指令时，使得所述通信装置执行如权利要求1-6，或权利要求12-19任一项所述的通信方法。
  22. 一种计算机存储介质，其特征在于，所述计算机存储介质包括计算机指令，当所述计算机指令运行时，执行如权利要求1-6，或权利要求12-19任一项所述的通信方法。
  23. 一种通信装置，其特征在于，所述通信装置被配置为实现如权利要求7-11任一项所述的通信方法。
  24. 一种通信装置，其特征在于，所述通信装置包括一个或多个处理器和一个或多个存储器；所述一个或多个存储器与所述一个或多个处理器耦合，所述一个或多个存储器存储有计算机指令；
    当所述一个或多个处理器执行所述计算机指令时，使得所述通信装置执行如权利要求7-11任一项所述的通信方法。
  25. 一种计算机存储介质，其特征在于，所述计算机存储介质包括计算机指令，当所述计算机指令运行时，执行如权利要求7-11任一项所述的通信方法。
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