Method and communication device for detecting PSCCH

Abstract

The present application provides a method and communication device for detecting a PSCCH. In this method, a first terminal device can detect a first PSCCH based on resources included in a candidate resource set indicated by first indication information, thereby avoiding the overhead incurred by the first terminal device needing to blindly detect the PSCCH, thereby reducing energy consumption. In particular, this method can avoid the overhead incurred by the first terminal device needing to blindly detect the PSCCH when the bandwidth is relatively large or there are many subchannels.

Description

Technical Field

[0001] The present application relates to the field of communications, and more particularly to a method and a communication device for detecting a PSCCH in the field of communications. Background Art

[0002] Terminal devices can communicate directly with each other via sidelinks (SL). Compared with cellular communication, SL communication can reduce transmission delay and alleviate the load on the cellular network. There are two ways to allocate resources via SL communication: one is for the network device to allocate resources for SL communication, and the other is for the terminal device to select resources from a preconfigured resource pool. If the terminal device is within the coverage of the network device, the terminal device can use the resources allocated by the network device for SL communication or select resources from a preconfigured resource pool for SL communication. If the terminal device is outside the coverage of the network device, the terminal device needs to select resources from a preconfigured resource pool. For example, the terminal device can send a physical sidelink control channel (PSCCH) on a resource selected from a preconfigured resource pool. The terminal device receiving the PSCCH needs to blindly detect the PSCCH in the preconfigured resource pool. When the bandwidth of the resources in the preconfigured resource pool is relatively large or the corresponding sub-channels are relatively large, the overhead of blind detection by the terminal device receiving the PSCCH is relatively large, resulting in relatively high power consumption. Summary of the Invention

[0003] The embodiments of the present application provide a method and a communication device for detecting PSCCH, which can reduce the overhead of blind detection and thus reduce the power consumption of terminal equipment.

[0004] In a first aspect, a method for detecting PSCCH is provided, which is applicable to a first terminal device, and the method includes: receiving first indication information, wherein the first indication information is used to indicate a candidate resource set, and the resources included in the candidate resource set are candidate resources for sending PSCCH by the second terminal device; detecting the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0005] In the above solution, the first terminal device can detect the first PSCCH based on the resources included in the candidate resource set indicated by the first indication information, thereby reducing the overhead caused by the first terminal device needing to blindly detect the PSCCH, which is conducive to reducing energy consumption. In particular, when the bandwidth is relatively large or there are many sub-channels, the overhead caused by the first terminal device needing to blindly detect the PSCCH can be reduced.

[0006] Optionally, the candidate resource set includes one or more resources.

[0007] Optionally, the one or more resources included in the candidate resource set may be one or more frequency domain resources, or may be one or more time domain resources, or may be one or more time-frequency domain resources.

[0008] Optionally, the candidate resource set may be pre-configured or configured by the network device.

[0009] Optionally, the candidate resource set may be determined by the second terminal device.

[0010] Optionally, detecting the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information includes: if the reference signal received power RSRP corresponding to the received first indication information is greater than a first RSRP threshold, detecting the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0011] In the above scheme, when the RSRP of the first terminal device receiving the first indication information is greater than the first RSRP threshold, the first terminal device detects the first PSCCH according to the resources included in the candidate resource set. In this way, the situation in which the first terminal device detects the first PSCCH as soon as it receives the first indication information is avoided. In other words, after the first terminal device receives the first indication information, it determines whether it needs to detect the PSCCH based on the RSRP of the first indication information. When the RSRP of the first indication information is greater than the first RSRP threshold, it means that the signal strength of the first indication information is large, or the distance between the first terminal device and the second terminal device is close. If the first terminal device is the target receiving device of the second terminal device, the first terminal device detects the first PSCCH sent by the second terminal device to improve the success rate of the detection. If the first terminal device is other equipment that needs to select resources for data transmission, the interference between the first terminal device and the second terminal device may be relatively large. The first terminal device detects the first PSCCH sent by the second terminal device to avoid the resources selected by the second terminal device.

[0012] Optionally, the RSRP for receiving the first indication information may be receiving a message, the RSRP of the message may be the RSRP for receiving the first indication information, or the RSRP of a message associated with the message may be the RSRP for receiving the first indication information.

[0013] In some possible implementations, the first RSRP threshold is preset or configured by a network device.

[0014] In some possible implementations, the first indication information is also used to indicate a first service priority; the method further includes: determining the first RSRP threshold based on the first service priority and the second service priority of the first terminal device, or determining the first RSRP threshold based on the first service priority.

[0015] In the above solution, different service priorities correspond to different RSRP thresholds. The first terminal device may determine the first RSRP threshold based on the first service priority indicated by the first indication information. Alternatively, the first terminal device may determine the first RSRP threshold based on the first service priority and the second service priority of the first terminal device. This avoids a situation where the first terminal device cannot determine the first RSRP threshold.

[0016] Optionally, if the second terminal device supports only one service, the first service priority may be the priority of the service. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to the service with the highest priority among the multiple services. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to any one of the multiple services.

[0017] Optionally, the first terminal device may be preset with a correspondence between a service priority and an RSRP threshold. The first terminal device may determine the first RSRP threshold based on the first service priority indicated by the first indication information and the correspondence, or the first terminal device may determine the first RSRP threshold based on the first service priority, the second service priority and the correspondence.

[0018] In some possible implementations, the first indication information is further used to indicate a target address, the target address indicated by the first indication information is an address corresponding to the service, and detecting the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information includes:

[0019] If the target address of a service of the first terminal device is the same as the target address indicated by the first indication information, detecting a first PSCCH according to the resources included in the candidate resource set indicated by the first indication information;

[0020] The method further comprises:

[0021] A first physical sidelink shared channel (PSSCH) associated with the first PSCCH is received according to the first PSCCH.

[0022] In the above scheme, if the first terminal device has a destination address that is the same as the target address indicated by the first indication information, it indicates that the second terminal device that sent the first indication information has a need to transmit a PSSCH with the first terminal device. Therefore, the first terminal device needs to detect the first PSCCH based on the candidate resource set and receive the first PSSCH associated with the first PSCCH from the second terminal device, making it possible for the first terminal device and the second terminal device to transmit the first PSSCH.

[0023] Optionally, the target address indicated by the first indication information can be the target ID of the first service at layer 2 determined by the second terminal device, and the target address of a service existing in the first terminal device can be the target ID of the first service at layer 2 existing in the first terminal device. The first PSSCH associated with the first PSCCH can be the PSSCH corresponding to the first service.

[0024] In some possible implementations, radio resource control RRC signaling is received via a second PSSCH, where the RRC signaling carries the first indication information.

[0025] In the above solution, the second terminal device can send RRC signaling carrying the first indication information through the second PSSCH, and the first terminal device can receive RRC signaling carrying the first indication information through the second PSSCH.

[0026] In some possible implementations, a media access control layer element MAC CE is received through the second PSSCH, and the MAC CE carries the first indication information.

[0027] In the above solution, the second terminal device can send a MAC CE carrying the first indication information through the second PSSCH, and the first terminal device can receive a MAC CE carrying the first indication information through the second PSSCH.

[0028] In some possible implementations, second-stage sidelink control information SCI2 is received via the second PSSCH, where the SCI2 carries the first indication information.

[0029] In the above solution, the second terminal device can send SCI2 carrying the first indication information through the second PSSCH, and the first terminal device can receive SCI2 carrying the first indication information through the second PSSCH.

[0030] In some possible implementations, sidelink control information SCI associated with the second PSSCH is received, where the SCI includes second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information.

[0031] In the above scheme, the first terminal device can determine that the second PSSCH carries the first indication information based on the second indication information carried in the SCI associated with the second PSSCH. In this way, the first terminal device can determine the first indication information in the second PSSCH based on the second indication information.

[0032] Optionally, the SCI associated with the second PSSCH may be first-stage sidelink control information SCI1 or sidelink control information SCI. Optionally, the design of the SCI varies in different communication systems. In some communication systems, the SCI is sent via the PSCCH, while in some communication systems, part of the SCI is sent via the PSCCH and the remaining SCI is sent via the PSSCH. For example, SCI1 is sent via the PSCCH, and SCI2 is sent via the PSSCH.

[0033] In some possible implementations, the method further includes: sending a first response message to the second terminal device, where the first response message is used to indicate that the first terminal device has received the first indication information.

[0034] In the above scheme, if the second terminal device receives the first response message, it means that the first terminal device has received the first indication information, so the second terminal device can send at least one first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0035] In some possible implementations, the first response message is a first hybrid automatic repeat request HARQ message of the second PSSCH.

[0036] In some possible implementations, the receiving of the first indication information includes: receiving an RRC connection establishment request message, where the RRC connection establishment request message includes the first indication information. In some possible implementations, the first response message may be an RRC connection establishment response message. Thus, when the second terminal device receives the RRC connection establishment response message, it indicates that the first terminal device has received the first indication information, and therefore the second terminal device may send at least one first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0037] In the above scheme, if the second terminal device sends the first indication information through the second PSSCH, when the first terminal device receives the second PSSCH, the first HARQ of the second PSSCH can be sent to the second terminal device. In this way, the second terminal device can determine that the first terminal device has received the first indication information based on the first HARQ, and therefore the second terminal device can send at least one first PSCCH based on the resources included in the candidate resource set indicated by the first indication information.

[0038] In some possible implementations, the receiving the first indication information includes: receiving a physical sidelink broadcast channel PSBCH, where the PSBCH includes the first indication information.

[0039] Optionally, the second terminal device may send a PSBCH, where the PSBCH carries the first indication information. Alternatively, the second terminal device may send a sidelink synchronization signal block S-SSB, where the PSBCH in the S-SSB carries the first indication information.

[0040] In some possible implementations, the receiving the first indication information includes: receiving the first indication information on a preconfigured candidate resource or a candidate resource configured by the network device.

[0041] In the above scheme, the second terminal device can send the first indication information on the preconfigured candidate resources, and the first terminal device can receive the first indication information on the preconfigured candidate resources; or, the second terminal device can send the first indication information on the candidate resources configured by the network device, and the first terminal device can receive the first indication information on the candidate resources configured by the network device. In this way, the situation where the first terminal device cannot receive the first indication information can be avoided.

[0042] Optionally, the bandwidth of the preconfigured candidate resources is less than the first bandwidth preset value, or the number of sub-channels of the preconfigured candidate resources is less than the first channel preset value. In this way, when the second terminal device sends the first indication information on the preconfigured candidate resources, the first terminal device can reduce the overhead of blind detection in the process of detecting the first indication information on the preconfigured candidate resources; optionally, the bandwidth of the candidate resources configured by the network device is less than the first bandwidth preset value, or the number of sub-channels of the preconfigured resources is less than the first channel preset value. In this way, when the second terminal device sends the first indication information on the candidate resources configured by the network device, the first terminal device can reduce the overhead of blind detection in the process of detecting the first indication information on the candidate resources configured by the network device.

[0043] In some possible implementations, the detecting of the first PSCCH based on the resources included in the candidate resource set indicated by the first indication information includes: determining resources where the resources in the candidate resource set indicated by the first indication information intersect with the resources in the first perception window; and detecting the first PSCCH on the resources where the intersection exists.

[0044] In the above solution, if the first terminal device has a need to transmit data, the first terminal device may determine a first perception window. The first terminal device may determine the intersection of the first perception window and the resources included in the candidate resource set indicated by the first indication information, and detect the first PSCCH on the resources with the intersection.

[0045] In the second aspect, a method for detecting PSCCH is provided, which is applicable to a second terminal device, sending a first indication information, wherein the first indication information is used to indicate a candidate resource set, and the resources included in the candidate resource set are candidate resources for the second terminal device to send PSCCH; at least one first PSCCH is sent according to the resources included in the candidate resource set indicated by the first indication information.

[0046] In the above scheme, the second terminal device can send at least one first PSCCH according to the resources included in the candidate resource set indicated by the first indication information, and the first terminal device can detect the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information, thereby reducing the overhead caused by the first terminal device's need to blindly detect the PSCCH, which is conducive to reducing energy consumption.

[0047] Optionally, the second terminal device sends at least one first PSCCH based on the resources included in the candidate resource set, and when the RSRP of the first indication information received by the first terminal device is greater than a first RSRP threshold, the first terminal device can detect the first PSCCH based on the resources included in the candidate resource set. In particular, when the bandwidth is relatively large or there are many sub-channels, the overhead caused by the need for the first terminal device to blindly detect the PSCCH can be reduced.

[0048] In some possible implementations, the first indication information is further used to indicate a first service priority.

[0049] Optionally, if the second terminal device supports only one service, the first service priority may be the priority of the service. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to the service with the highest priority among the multiple services. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to any one of the multiple services.

[0050] Optionally, the first service priority indicated by the first indication information is used by the first terminal device to determine a first RSRP threshold.

[0051] In some possible implementations, the first indication information is also used to indicate a target address, and the target address indicated by the first indication information is an address corresponding to the service; the method also includes: sending at least one physical sidelink shared channel PSSCH associated with the at least one first PSCCH according to the at least one first PSCCH.

[0052] Optionally, the target address indicated by the first indication information can be the target ID of the first service at layer 2 determined by the second terminal device, and the target address of a service existing in the first terminal device can be the target ID of the first service at layer 2 existing in the first terminal device. The first PSSCH associated with the first PSCCH can be the PSSCH corresponding to the first service.

[0053] In some possible implementations, the method includes sending radio resource control RRC signaling via a second PSSCH, where the RRC signaling carries the first indication information.

[0054] In some possible implementations, a media access control layer element MAC CE is sent via a second PSSCH, where the MAC CE carries the first indication information.

[0055] In some possible implementations, the second-stage sidelink control information SCI2 is sent via the second PSSCH, where the SCI2 carries the first indication information.

[0056] In some possible implementations, the method further includes: sending side link control information SCI associated with the second PSSCH, where the SCI includes second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information.

[0057] In some possible implementations, the method further includes: receiving a first response message, where the first response message is used to indicate that the first terminal device has received the first indication information.

[0058] In some possible implementations, the first response message is a first hybrid automatic repeat request HARQ message of the second PSSCH.

[0059] In some possible implementations, sending the first indication information includes: sending an RRC connection establishment request message, where the RRC connection establishment request message includes the first indication information. In some possible implementations, the first response message may be an RRC connection establishment response message. In this way, when the second terminal device receives the RRC connection establishment response message, it indicates that the first terminal device has received the first indication information, and therefore the second terminal device can send at least one first PSCCH based on the resources included in the candidate resource set indicated by the first indication information.

[0060] In some possible implementations, the sending of the first indication information includes: sending a physical sidelink broadcast channel PSBCH, where the PSBCH includes the first indication information.

[0061] In some possible implementations, the sending the first indication information includes: sending the first indication information according to preconfigured candidate resources or candidate resources configured by the network device.

[0062] In some possible implementations, the sending the first indication information according to the preconfigured candidate resources or the candidate resources configured by the network device includes:

[0063] receiving at least one second PSCCH in a second perception window; determining resources in a reserved second selection window based on the at least one second PSCCH;

[0064] sending the first indication information according to the reserved resources in the second selection window and the preconfigured candidate resources, or;

[0065] The first indication information is sent according to the reserved resources in the second selection window and the candidate resources configured by the network device.

[0066] In the above scheme, when the second terminal device has the need to send the first indication information, it can determine the second perception window and the second selection window. The second terminal device can receive at least one second PSCCH in the second perception window, and the control information carried by the at least one second PSCCH is used to indicate the resources reserved in the second selection window. The second terminal device sends the first indication information based on the resources in the reserved second selection window, as well as the preconfigured candidate resources or the candidate resources configured by the network device. Optionally, the second terminal device can avoid the resources in the second selection window reserved by at least one second PSCCH when selecting resources from the preconfigured candidate resources or the candidate resources configured by the network device. In other words, if the resources reserved by at least one second PSCCH in the second selection window just intersect with the preconfigured candidate resources or the candidate resources configured by the network device, then when the second terminal device selects the resources to send the first indication information from the preconfigured candidate resources or the candidate resources configured by the network device, it needs to avoid the resources with the intersection. This is conducive to reducing interference and increasing the possibility of successfully sending the first indication information.

[0067] In some possible implementations, the sending at least one first PSCCH using resources included in the candidate resource set indicated by the first indication information includes:

[0068] Determine resources that intersect between resources included in the candidate resource set indicated by the first indication information and resources in the first selection window;

[0069] The at least one first PSCCH is sent on the resources where there is an intersection.

[0070] In the above solution, if the first terminal device has a need to transmit data, the first terminal device may determine a first perception window. The first terminal device may determine the intersection of the first perception window and the resources included in the candidate resource set indicated by the first indication information, and detect the first PSCCH on the resources with the intersection.

[0071] In a third aspect, an apparatus for detecting a PSCCH is provided, the apparatus being configured to perform the method of any possible implementation of the first aspect. Specifically, the apparatus may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may be configured to perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0072] The device can be used to execute the actions performed by the first terminal device in any possible implementation of the first aspect. In this case, the device can be called the first terminal device, the transceiver unit is used to execute the transceiver-related operations on the first terminal device side in any possible implementation of the first aspect, and the processing unit is used to execute the processing-related operations on the first terminal device side in any possible implementation of the first aspect.

[0073] In which, the transceiver unit is used to receive first indication information, and the first indication information is used to indicate a candidate resource set, and the resources included in the candidate resource set are candidate resources for the second terminal device to send PSCCH; if the reference signal received power RSRP corresponding to the received first indication information is greater than the first RSRP threshold, the processing unit is used to control the transceiver unit to detect the first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0074] In some possible implementations, the first RSRP threshold is preset or configured by a network device.

[0075] In some possible implementations, the first indication information is also used to indicate a first service priority; the processing unit is used to: determine the first RSRP threshold based on the first service priority and the second service priority of the first terminal device, or determine the first RSRP threshold based on the first service priority.

[0076] In some possible implementations, the first indication information is also used to indicate a target address, and the target address indicated by the first indication information is an address corresponding to a service. The processing unit is specifically used to control the transceiver unit: if there is a service in the first terminal device whose target address is the same as the target address indicated by the first indication information, the first PSCCH is detected according to the resources included in the candidate resource set indicated by the first indication information; the transceiver unit is also used to: receive a first physical sidelink shared channel PSSCH associated with the first PSCCH according to the first PSCCH.

[0077] In some possible implementations, the transceiver unit is further configured to: receive radio resource control RRC signaling through a second PSSCH, where the RRC signaling carries the first indication information; or,

[0078] receiving a media access control layer element MAC CE through the second PSSCH, where the MAC CE carries the first indication information; or,

[0079] Second-stage sidelink control information SCI2 is received through the second PSSCH, where the SCI2 carries the first indication information.

[0080] In some possible implementations, the transceiver unit is further used to: receive side link control information SCI associated with the second PSSCH, the SCI including second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information.

[0081] In some possible implementations, the transceiver unit is specifically configured to receive a physical sidelink broadcast channel (PSBCH), where the PSBCH includes the first indication information.

[0082] In some possible implementations, the transceiver unit is specifically configured to: receive the first indication information on a pre-configured candidate resource or a candidate resource configured by a network device.

[0083] In some possible implementations, the processing unit is configured to:

[0084] Determine resources in which the resources in the candidate resource set indicated by the first indication information intersect with the resources in the first perception window;

[0085] The transceiver unit is configured to detect the first PSCCH on the resources with the intersection.

[0086] In a fourth aspect, an apparatus for detecting a PSCCH is provided, the apparatus being configured to perform the method of any possible implementation of the second aspect. Specifically, the apparatus may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may be configured to perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0087] The device can be used to execute the actions performed by the terminal device in any possible implementation of the second aspect. In this case, the device can be called a terminal device, the transceiver unit is used to execute the transceiver-related operations on the terminal device side in any possible implementation of the second aspect, and the processing unit is used to execute the processing-related operations on the terminal device side in any possible implementation of the second aspect.

[0088] In which, the transceiver unit is used to send a first indication information, and the first indication information is used to indicate a candidate resource set, and the resources included in the candidate resource set are candidate resources for the second terminal device to send PSCCH; the transceiver unit is also used to send at least one first PSCCH according to the resources included in the candidate resource set indicated by the first indication information.

[0089] In some possible implementations, the first indication information is further used to indicate a first service priority.

[0090] In some possible implementations, the first indication information is further used to indicate a target address, where the target address indicated by the first indication information is an address corresponding to the service; and the transceiver unit is further used to:

[0091] At least one physical sidelink shared channel PSSCH associated with the at least one first PSCCH is sent according to the at least one first PSCCH.

[0092] In some possible implementations, the transceiver unit is further configured to:

[0093] Sending radio resource control RRC signaling via a second PSSCH, where the RRC signaling carries the first indication information; or,

[0094] Sending a media access control layer element MAC CE through a second PSSCH, where the MAC CE carries the first indication information; or,

[0095] The second-stage sidelink control information SCI2 is sent through the second PSSCH, where the SCI2 carries the first indication information.

[0096] In some possible implementations, the transceiver unit is further used to: send side link control information SCI associated with the second PSSCH, the SCI including second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information.

[0097] In some possible implementations, the transceiver unit is specifically configured to: send a physical sidelink broadcast channel PSBCH, where the PSBCH includes the first indication information.

[0098] In some possible implementations, the transceiver unit is specifically configured to send the first indication information according to preconfigured candidate resources or candidate resources configured by the network device.

[0099] In some possible implementations, the transceiver unit is configured to:

[0100] receiving at least one second PSCCH in a second perception window;

[0101] The processing unit is configured to determine resources in a reserved second selection window according to the at least one second PSCCH;

[0102] The transceiver unit is used for:

[0103] sending the first indication information according to the reserved resources in the second selection window and the preconfigured candidate resources, or;

[0104] The first indication information is sent according to the reserved resources in the second selection window and the candidate resources configured by the network device.

[0105] In some possible implementations, the processing unit is configured to: determine resources including an intersection between resources included in the candidate resource set indicated by the first indication information and resources in the first selection window;

[0106] The transceiver unit is configured to send the at least one first PSCCH on the resources with the intersection.

[0107] In a fifth aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned first aspect or any possible implementation of the first aspect is executed.

[0108] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0109] Optionally, the device includes one or more processors.

[0110] Optionally, the device may further include a memory coupled to the processor.

[0111] Optionally, the device may include one or more memories.

[0112] Optionally, the memory may be integrated with the processor or provided separately.

[0113] Optionally, the device may further include a transceiver.

[0114] In a sixth aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned second aspect or any possible implementation of the second aspect is executed.

[0115] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0116] Optionally, the device includes one or more processors.

[0117] Optionally, the device may further include a memory coupled to the processor.

[0118] Optionally, the device may include one or more memories.

[0119] Optionally, the memory may be integrated with the processor or provided separately.

[0120] Optionally, the device may further include a transceiver.

[0121] In the seventh aspect, a communication system is provided, which includes the communication device in the third aspect or any possible implementation of the third aspect, and the communication device in the fourth aspect or any possible implementation of the fourth aspect; or, the communication system includes the communication device in the fifth aspect or any possible implementation of the fifth aspect, and the communication device in the sixth aspect or any possible implementation of the sixth aspect.

[0122] In an eighth aspect, a computer-readable storage medium is provided, on which is stored a computer program (also referred to as instructions or codes) for implementing the method in the first aspect or any possible implementation manner of the first aspect.

[0123] For example, when the computer program is executed by a computer, the computer can execute the method in the first aspect or any possible implementation of the first aspect. The computer can be a communication device.

[0124] In a ninth aspect, a computer-readable storage medium is provided, on which is stored a computer program (also referred to as instructions or codes) for implementing the method in the second aspect or any possible implementation manner of the second aspect.

[0125] For example, when the computer program is executed by a computer, the computer can execute the method in the second aspect or any possible implementation of the second aspect. The computer can be a communication device.

[0126] In a tenth aspect, the present application provides a chip including a processor, wherein the processor is configured to read and execute a computer program stored in a memory to perform the method in the first aspect and any possible implementation thereof.

[0127] Optionally, the chip further includes a memory, and the memory is connected to the processor via a circuit or wire.

[0128] Further optionally, the chip also includes a communication interface.

[0129] In an eleventh aspect, the present application provides a chip including a processor, wherein the processor is configured to read and execute a computer program stored in a memory to perform the method in the second aspect and any possible implementation thereof.

[0130] Optionally, the chip further includes a memory, and the memory is connected to the processor via a circuit or wire.

[0131] Further optionally, the chip also includes a communication interface.

[0132] In the twelfth aspect, the present application provides a computer program product, which includes a computer program (also referred to as instructions or codes), and when the computer program is executed by a computer, enables the computer to implement the method in the first aspect or any possible implementation of the first aspect.

[0133] In the thirteenth aspect, the present application provides a computer program product, which includes a computer program (also referred to as instructions or codes), and when the computer program is executed by a computer, enables the computer to implement the method in the second aspect or any possible implementation of the second aspect.

[0134] In a fourteenth aspect, the present application provides a communication device comprising a unit for implementing the method described in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0135] Figure 1 It is a schematic diagram of a communication system provided in an embodiment of the present application.

[0136] Figure 2 It is a schematic diagram of a method for detecting PSCCH provided in an embodiment of the present application.

[0137] Figure 3 2 is a schematic diagram of a second perception window and a second selection window provided in an embodiment of the present application.

[0138] Figure 4 This is a schematic diagram of reserved resources in the second perception window and the second selection window provided in an embodiment of the present application.

[0139] Figure 5 It is a schematic diagram of S-SSB provided in an embodiment of the present application.

[0140] Figure 6 This is a schematic diagram of another method for detecting PSCCH provided in an embodiment of the present application.

[0141] Figure 7 This is a schematic diagram of another method for detecting PSCCH provided in an embodiment of the present application.

[0142] Figure 8 3 is a schematic diagram of a communication device for detecting PSCCH provided in an embodiment of the present application. DETAILED DESCRIPTION

[0143] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0144] It should be understood that the methods, situations, categories and divisions of the embodiments in the present application are only for the convenience of description and should not constitute special limitations. The features of various methods, categories, situations and embodiments can be combined without contradiction.

[0145] It should also be understood that the terms "first," "second," and "third" in the embodiments of this application are for distinction only and should not constitute any limitation on this application. It should also be understood that in the various embodiments of this application, the order of the sequence numbers of the processes does not imply a specific order of execution. The order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation of the embodiments of this application.

[0146] Figure 1 is a schematic diagram of an inter-device communication system 100. The wireless communication device may include one or more network devices, such as Figure 1 The network device 110 in the embodiment. Both the terminal device 121 and the terminal device 122 can communicate with the network device 110, for example Figure 1In the example, the network device 110 communicates with the terminal device 121. The link where the terminal device 121 sends data to the network device 110 is called an uplink, and the link where the terminal device 121 receives data sent by the network device 110 is called a downlink. Figure 1 As shown, the wireless communication system 100 may also include multiple terminal devices, such as Figure 1 Terminal device 121 and terminal device 122 in the figure. Terminal device 121 and terminal device 122 can communicate directly with each other. The link for transmitting data between terminal device 121 and terminal device 122 is called a sidelink. For example, terminal device 121 can send data to terminal device 122 via the sidelink, and terminal device 122 can send data to terminal device 121 via the sidelink. Sidelinks are generally used in scenarios such as vehicle to everything (V2X) or device to device (D2D), where direct communication between devices is possible. V2X communication can be regarded as a special case of D2D communication.

[0147] New radio (NR) access technology is currently a mainstream wireless communication technology. It supports V2X communication with lower latency and higher reliability, tailored to the characteristics of V2X services and emerging service requirements. V2X is a foundational and key technology for realizing smart cars, autonomous driving, and intelligent transportation systems. V2X can include vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-pedestrian (V2P). V2N communication is currently the most widely used form of connected vehicle. Its main function is to connect vehicles to cloud servers via mobile networks, providing navigation, entertainment, anti-theft, and other applications. V2V communication can be used for information exchange and alerts between vehicles, with the most typical application being vehicle-to-vehicle collision avoidance safety systems. Through V2I communication, vehicles can communicate with roads and even other infrastructure, such as traffic lights and roadblocks, to obtain road management information such as traffic light signal timing. V2P communication can be used to provide safety warnings to pedestrians and non-motorized vehicles on the road.

[0148] The terminal device 121 or the terminal device 122 may be fixed in position or movable. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1The embodiments of the present application do not limit the types and quantities of network devices and terminal devices included in the mobile communication system.

[0149] In a mobile communication system 100, a terminal device 121 or a terminal device 122 wirelessly accesses a network device in the mobile communication system. The network device 101 may be a base station, an evolved node B (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), etc. It may also be a gNB in an NR system, or a component or part of a base station, such as a central unit (CU), a distributed unit (DU), or a baseband unit (BBU).

[0150] The terminal device 121 or terminal device 122 in the mobile communication system 100 may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, or a wireless terminal used in scenarios such as virtual reality (VR), augmented reality (AR), industrial control (industrial control), self-driving, remote medical care, smart grid, transportation safety, smart city, and smart home. In this application, the aforementioned terminal devices and chips applicable to the aforementioned terminal devices are collectively referred to as terminal devices. It should be understood that the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal devices.

[0151] It should be understood that Figure 1The terminal device 121, the terminal device 122, and the network device 110 are schematically shown for ease of understanding only, but this should not constitute any limitation to the present application. The wireless communication system can also include a greater number of network devices, and can also include a greater or lesser number of terminal devices, and the present application does not limit this.

[0152] The resources used by the terminal device 121 to communicate with the terminal device 122 may be resources allocated by the network device 110, or may be resources spontaneously selected from a preset resource pool. If the terminal device 121 and the terminal device 122 are within the coverage of the network device 110, the resources used by the terminal device 121 to communicate with the terminal device 122 may be resources allocated by the network device 110 or resources spontaneously selected from a preset resource pool. If the terminal device 121 or the terminal device 122 is not within the coverage of the network device 110, the resources used by the terminal device 121 to communicate with the terminal device 122 are resources spontaneously selected from a preset resource pool. For example, the terminal device 121 sends a PSCCH to the terminal device 122 via a resource spontaneously selected from a preset resource pool, and the terminal device 122 needs to perform blind detection in the preset resource pool in order to receive the PSCCH sent by the terminal device 121. If the bandwidth of the resources in the preset resource pool is relatively large or the corresponding sub-channels are relatively large, the overhead of blind detection of the terminal device 122 will be relatively large, thereby causing the energy consumption of the terminal device 122 to be relatively high.

[0153] The following description takes the first terminal device as the terminal device 122 and the second terminal device as the terminal device 121 as an example.

[0154] In order to solve the above problem, in an embodiment of the present application, the second terminal device can send a first indication information, and the first indication information is used to indicate the candidate resource set for the second terminal device to send PSCCH. After the first terminal device receives the first indication information, it can receive the PSCCH sent by the second terminal device according to the candidate resource set indicated by the first indication information, thereby avoiding the overhead caused by the first terminal device needing to blindly detect PSCCH on all resources in a preset resource pool.

[0155] The following describes the method for detecting PSCCH provided by the embodiment of the present application in conjunction with the accompanying drawings. Figure 2 As shown, the method 200 includes:

[0156] S201, the second terminal device sends the first indication information, and the first terminal device receives the first indication information.

[0157] The first indication information is used to indicate at least one of a candidate resource set, a first service priority, and a target address, wherein the target address is an address corresponding to the service of the second terminal device.

[0158] Optionally, the resources included in the candidate resource set are candidate resources for the second terminal device to send PSCCH.

[0159] Optionally, the candidate resource set includes one or more resources.

[0160] Optionally, the one or more resources included in the candidate resource set may be one or more frequency domain resources, or may be one or more time domain resources, or may be one or more time-frequency domain resources.

[0161] Optionally, the candidate resource set in S201 may be pre-configured or configured by a network device.

[0162] Optionally, the candidate resource set in S201 may be determined by the second terminal device. Optionally, the second terminal device may select one or more subchannels with relatively good channel conditions as frequency domain resources included in the candidate resource set. Optionally, the second terminal device may select one or more time slots as time domain resources included in the candidate resource set based on the period of the first service of the second terminal device.

[0163] Optionally, the second terminal device may support one or more services. Optionally, the first indication information may further indicate the first service priority. Optionally, if the second terminal device supports only one service, the first service priority is the priority of the service. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to the service with the highest priority among the multiple services. Optionally, if the second terminal device supports multiple services, the first service priority may be the priority corresponding to any one of the multiple services.

[0164] Optionally, any one of the one or more services supported by the second terminal device may be a unicast service, a broadcast service, or a multicast service.

[0165] Optionally, the target address of the first service may be a destination address where the second terminal device has a need to send data and needs to send the data of the first service to the destination address. Optionally, the target address may be a layer 2 target ID of the destination of the first service, where layer 2 refers to medium access control (MAC). Optionally, the second terminal device may obtain the layer 2 target ID based on the application layer ID. For example, the layer 2 ID may be 24 bits.

[0166] Optionally, the first indication information may also indicate an identifier of the second terminal device.

[0167] Among them, the first indication information sent by the second terminal device can be received by one or more terminal devices. The embodiment of the present application is described only by taking the first terminal device receiving the first indication information as an example.

[0168] Optionally, after receiving the first indication information, the first terminal device may send a first response message to the second terminal device, where the first response message indicates that the first terminal device has received the first indication information. After receiving the first response message, the second terminal device executes S202.

[0169] Optionally, the second terminal device may periodically send the first indication information, and the period may be preset or configured by the network device. Optionally, the second terminal device may send the first indication information if there is a need to transmit data. Optionally, the second terminal device may randomly send the first indication information. This application does not impose any restrictions on the triggering conditions for the second terminal device to send the first indication information.

[0170] Optionally, what is described in S201 is that the first indication information is used to instruct the second terminal device to send at least one of the candidate resource set, the first service priority, and the target address of the PSCCH. It is understandable that different indication information can also be used to instruct the second terminal device to send at least one of the candidate resource set, the first service priority, and the target address of the PSCCH. Alternatively, indication information instructing the second terminal device to send at least one of the candidate resource set, the first service priority, and the target address of the PSCCH can be sent through different messages. For example, indication information 1 is used to instruct the second terminal device to send the candidate resource set of the PSCCH, indication information 2 is used to indicate the first service priority, and indication information 3 is used to indicate the target address. Indication information 1, indication information 2, and indication information 3 can be sent in one message, or indication information 1, indication information 2, and indication information 3 can be sent in different messages, for example, indication information 1 is sent in message 1, indication information 2 is sent in message 2, and indication information 3 is sent in message 3, or two or three of indication information 1, indication information 2, and indication information 3 are sent in the same message.

[0171] Optionally, the second terminal device may select a resource for sending the first indication information according to any one of the following methods.

[0172] In the first method, the second terminal device may send the first indication information on a pre-configured candidate resource or a candidate resource configured by the network device. The pre-configured candidate resource may be understood as a resource specified by the protocol.

[0173] Optionally, the bandwidth of the preconfigured candidate resources is less than the first bandwidth preset value, or the number of sub-channels of the preconfigured candidate resources is less than the first channel preset value. In this way, when the second terminal device sends the first indication information on the preconfigured candidate resources, the first terminal device can reduce the overhead of blind detection in the process of detecting the first indication information on the preconfigured candidate resources; optionally, the bandwidth of the candidate resources configured by the network device is less than the first bandwidth preset value, or the number of sub-channels of the preconfigured resources is less than the first channel preset value. In this way, when the second terminal device sends the first indication information on the candidate resources configured by the network device, the first terminal can reduce the overhead of blind detection in the process of detecting the first indication information on the candidate resources configured by the network device.

[0174] Optionally, the pre-configured candidate resources may be narrowband resources, or the candidate resources configured by the network device may be called narrowband resources.

[0175] Optionally, both the first terminal device and the second terminal device may be aware of preconfigured candidate resources, or may be aware of candidate resources configured by the network device. In this way, the second terminal device may send the first indication information on the preconfigured candidate resources or the candidate resources configured by the network device, and the first terminal device may receive the first indication information on the preconfigured candidate resources or the candidate resources configured by the network device.

[0176] Method 2: If the second terminal device has a need to send the first indication information, the second terminal device can determine a second sensing window and a second selection window. The second terminal device can receive at least one second PSCCH in the second sensing window. The control information carried by the at least one second PSCCH is used to indicate the resources reserved in the second selection window. When selecting resources in the second selection window, the second terminal device can avoid the reserved resources indicated by the control information carried by the at least one second PSCCH, which is conducive to reducing interference, thereby increasing the possibility of successfully sending the first indication information.

[0177] Optionally, the bandwidth of the second perception window determined by the second terminal device may be less than the second bandwidth preset value or the number of subchannels of the second perception window may be less than the second channel preset value, thus saving the overhead of the second terminal device receiving at least one second PSCCH. Optionally, the bandwidth of the second selection window determined by the second terminal device may be less than the third bandwidth preset value or the number of subchannels of the second selection window may be less than the third subchannel preset value, thus saving the overhead of the first terminal device detecting the first indication information.

[0178] Specifically, if Figure 3As shown, at the moment n when the need to send the first indication information is determined, the second terminal device can determine the second perception window and the second selection window according to the moment n. The second terminal device can receive the PSCCH sent by other terminal devices in the second perception window, and the control information carried by the PSCCH sent by other terminal devices is used to indicate the resources reserved in the second selection window. The second terminal device can determine the resources reserved in the second selection window indicated by the control information carried by the PSCCH sent by other terminal devices. The second terminal device may be able to receive PSCCH on some resources in the second perception window, but may not receive PSCCH on some resources. If the second terminal device detects PSCCH on some resources, the second terminal device measures the RSRP of the detected PSCCH or measures the RSRP of the PSSCH associated with the detected PSCCH. The second terminal device can determine the interference situation of the reserved resources indicated by the control information carried by the PSCCH in the second selection window based on the measured RSRP and the RSRP threshold. If the measured RSRP is greater than the RSRP threshold, it means that the interference of the reserved resources in the second selection window indicated by the control information carried by the PSCCH is too large, which means that the reserved resources indicated by the control information carried by the PSCCH in the second selection window are unavailable. If the RSRP is less than the RSRP threshold, it means that the interference of the reserved resources in the second selection window indicated by the control information carried by the PSCCH is small, which means that the reserved resources indicated by the control information carried by the PSCCH in the second selection window are available. The second terminal device can determine the resource to send the first indication information based on the interference situation of the resources. For example, Figure 4 As shown, the second terminal device receives the PSCCH sent by UE1, UE2 and UE3 on the three resources of the second perception window, and the control information carried by the PSCCH sent by UE1, UE2 and UE3 respectively reserves three resources in the second selection window, and the RSRP of the PSCCH sent by the three UEs detected in the second perception window measured by the second terminal device is greater than the RSRP threshold. When determining the resources for sending the first indication information, the second terminal device can avoid the three resources in the second selection window reserved by UE1, UE2 and UE3.

[0179] It can be understood that the control information carried by the PSCCH may be SCI or SCI1.

[0180] Method three: If the second terminal device has a need to send the first indication information, the second terminal device can determine the second perception window and the second selection window. The second terminal device can receive at least one second PSCCH in the second perception window, and the control information carried by the at least one second PSCCH is used to indicate the resources reserved in the second selection window. The second terminal device sends the first indication information based on the resources in the reserved second selection window, as well as the preconfigured candidate resources or the candidate resources configured by the network device. Optionally, the second terminal device can avoid the resources in the second selection window reserved by at least one second PSCCH when selecting resources from the preconfigured candidate resources or the candidate resources configured by the network device. In other words, if the resources reserved by at least one second PSCCH in the second selection window happen to intersect with the preconfigured candidate resources or the candidate resources configured by the network device, then when the second terminal device selects the resources to send the first indication information from the preconfigured candidate resources or the candidate resources configured by the network device, it needs to avoid the resources with the intersection. This is conducive to reducing interference and increasing the possibility of successfully sending the first indication information.

[0181] Optionally, both the first terminal device and the second terminal device may be aware of pre-configured candidate resources, or may be aware of candidate resources configured by the network device. In this way, the second terminal device may send the first indication information on the candidate resources with an intersection, and the first terminal device may receive the first indication information on the pre-configured candidate resources or the candidate resources configured by the network device.

[0182] Optionally, the bandwidth of the second perception window determined by the second terminal device may be less than the second bandwidth preset value or the number of subchannels of the second perception window may be less than the second channel preset value, so that the overhead of the second terminal device detecting at least one second PSCCH can be saved. Optionally, the bandwidth of the second selection window determined by the second terminal device may be less than the third bandwidth preset value or the number of subchannels of the second selection window may be less than the third subchannel preset value, the bandwidth of the pre-configured candidate resources or the candidate resources configured by the network device is less than the first bandwidth preset value, or the number of subchannels of the pre-configured candidate resources or the candidate resources configured by the network device is less than the first channel preset value, so that the overhead of the first terminal device detecting the first indication information can be saved.

[0183] Among them, the second selection window and the second perception window refer to Figure 3 .

[0184] Optionally, in S201, the second terminal device may send the first indication information in any one of the following ways.

[0185] Method 1: The second terminal device sends a physical sidelink broadcast channel (PSBCH), and the PSBCH includes the first indication information.

[0186] Optionally, the second terminal device may send a sidelink synchronization signal / physical broadcast channel block (S-SS / PBCH block). The S-SS / PBCH block may be referred to as a synchronization signal block (S-SSB), and the PSBCH in the S-SSB includes the first indication information. The schematic diagram of the S-SSB is shown in FIG. Figure 5 As shown, it includes a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), PSBCH and GAP.

[0187] Optionally, method 1 may be applicable to broadcast services.

[0188] Method 2: The second terminal device may send the first indication information via a second physical sidelink shared channel (PSSCH).

[0189] Optionally, the first indication information may be carried in radio resource control (RRC) signaling, and the second terminal device may send RRC signaling carrying the first indication information via the second PSSCH.

[0190] Optionally, the first indication information may be carried in a MAC control element (CE), and the second terminal device may send a MAC CE carrying the first indication information via a second PSSCH.

[0191] Optionally, the first indication information may be carried in the second-stage sidelink control information (SCI2). The second terminal device may send the SCI2 carrying the first indication information via the second PSSCH.

[0192] Optionally, if the first terminal device receives the first indication information through the second PSSCH, the first terminal device can send a first hybrid automatic repeat request (HARQ) message to the second terminal device. At this time, the aforementioned first response message can be a first HARQ message. After the second terminal device receives the first HARQ message, it can determine that the first terminal device has received the first indication information, and thus can execute S202.

[0193] Optionally, the second terminal device may also send second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information. The second PSSCH may carry a unicast identifier or a multicast identifier, and the first terminal device determines that the second PSSCH is sent to the first terminal device based on the unicast identifier or multicast identifier in the second PSSCH, so the first terminal device can parse the first indication information in the second PSSCH. For other terminal devices that receive the second indication information, such as the fourth terminal device, after the fourth terminal device receives the second PSSCH, the fourth terminal device determines that the second PSSCH is not sent to the fourth terminal device based on the unicast identifier or multicast identifier in the second PSSCH. However, if the fourth terminal device has a need to perceive resources, the fourth terminal device can determine that the second PSSCH carries the first indication information based on the second indication information. Therefore, the fourth terminal device can determine the candidate resource set for the second terminal device to send the PSCCH based on the first indication information in the second PSSCH. The fourth terminal device can detect the first PSCCH based on the resources included in the candidate resource set (the first PSCCH may be the same as or different from the first PSCCH detected by the first terminal device). In this way, the fourth terminal device can determine the resources reserved in the fourth selection window indicated by the control information carried by the first PSCCH based on the received first PSCCH, so that the fourth terminal device avoids the reserved resources indicated by the control information carried by the first PSCCH when selecting resources. In other words, the purpose of the second terminal device sending the second indication information is to enable the first indication information in the second PSSCH to be parsed regardless of whether it is the recipient of the second PSSCH.

[0194] Optionally, the second terminal device may send an SCI associated with a second PSSCH, the SCI associated with the second PSSCH including second indication information, and the SCI associated with the second PSSCH may be first-stage sidelink control information SCI1 or sidelink control information SCI. Optionally, the design of SCI is different in different communication systems. In some communication systems, SCI is sent through PSCCH, and in some communication systems, part of SCI is sent through PSCCH, and the remaining SCI is sent through PSSCH. For example, SCI1 is sent through PSCCH, and SCI2 is sent through PSSCH.

[0195] Optionally, in the second method, the second terminal device may send the first indication information via the second PSSCH in a multicast or unicast manner. Optionally, the second method may be applicable to a multicast or unicast service.

[0196] Optionally, if the first indication information indicates the first service priority, execute S202. Otherwise, execute S203 or execute S204.

[0197] S202: The first terminal device determines a first reference signal receiving power (RSRP) threshold according to a first service priority.

[0198] It is understandable that services with different service priorities have different corresponding RSRP thresholds. A higher service priority corresponds to a higher RSRP threshold, meaning more resources are available in the selection window to easily meet the requirements. A lower service priority corresponds to a lower RSRP threshold, meaning fewer resources are available in the selection window to easily meet the requirements. Therefore, the protocol can specify the relationship between service priority and RSRP threshold.

[0199] When the first terminal device determines the first service priority based on the first indication information, the first RSRP threshold corresponding to the first service priority can be determined based on the relationship between the service priority and the RSRP threshold. Optionally, the first terminal device can also determine the first RSRP threshold corresponding to the first service priority and the second service priority based on the relationship between the service priority and the RSRP threshold.

[0200] Among them, the second service priority is the priority corresponding to a service of the first terminal device. The first terminal device can support one or more services. Optionally, if the first terminal device only supports one service, the second service priority is the priority of the service. Optionally, if the first terminal device supports multiple services, the second service priority can be the priority corresponding to the service with the highest priority among the multiple services. Optionally, if the first terminal device supports multiple services, the second service priority can be the priority corresponding to any one of the multiple services. Optionally, the second service priority is the priority corresponding to the service that the first terminal device is about to transmit.

[0201] Optionally, step S202 may not exist, that is, the first RSRP threshold may be preset. In other words, the first indication information may indicate the first service priority, but the first terminal device does not execute S202, or the first indication information indicates the first service priority, but the first terminal device does not execute S202.

[0202] S203: The first terminal device determines whether the RSRP of the received first indication information is greater than a first RSRP threshold, and if so, executes S204. Otherwise, the method 200 ends.

[0203] Optionally, if the first terminal device receives the first indication information through the PSBCH, the RSRP of receiving the first indication information in S203 may be the RSRP of receiving the PSBCH.

[0204] Optionally, if the first terminal device receives the first indication information through S-SSB, the RSRP of receiving the first indication information in S203 may be the RSRP of receiving the PSBCH in the S-SSB.

[0205] Optionally, if the first terminal device receives the first indication information through the second PSSCH, the RSRP for receiving the first indication information in S203 may be the RSRP for receiving the second PSSCH, or the RSRP for receiving the PSCCH associated with the second PSSCH.

[0206] S204, the second terminal device sends at least one first PSCCH according to the resources included in the candidate resource set, and the first terminal device detects the first PSCCH according to the resources included in the candidate resource set.

[0207] Among them, the first PSCCH detected by the first terminal device based on the resources included in the candidate resource set can be one of at least one first PSCCH, or it can be multiple of at least one first PSCCH. The embodiment of the present application is described only by taking the detection of one PSCCH as an example.

[0208] Optionally, the second terminal device may send at least one first PSCCH on some of the resources included in the candidate resource set, or may send at least one first PSCCH on all of the resources included in the candidate resource set. Optionally, the first terminal device may detect at least some of the first PSCCHs in at least one first PSCCH on some of the resources included in the candidate resource set. Optionally, the first terminal device may detect at least some of the first PSCCHs in at least one first PSCCH on all of the resources included in the candidate resource set.

[0209] Optionally, if the first terminal device has a need to transmit data, the first terminal device may determine a first perception window. Figure 3 Similar to the second perception window in, the first perception window will not be described in detail to avoid redundancy. The first terminal device can determine the intersection of the first perception window and the resources included in the candidate resource set indicated by the first indication information, and detect the first PSCCH on the resources where the intersection exists. For example, the candidate resource set indicated by the first indication information includes resource 1, resource 2, and resource 3. The first perception window includes resource 3 and resource 4, then the first terminal device detects the first PSCCH on resource 3.

[0210] S205, the first terminal device sends a third PSCCH to the third terminal device according to the resources reserved in the third selection window indicated by the control information carried by the first PSCCH, and the third terminal device receives the third PSCCH.

[0211] The third selection window is a selection window corresponding to the first perception window determined by the first terminal device. That is, the first terminal device can determine the resources reserved in the third selection window indicated by the control information carried by the first PSCCH through the first perception window.

[0212] Optionally, when the first terminal device sends the third PSCCH to the third terminal device, it can avoid the resources reserved in the third selection window indicated by the control information carried by the first PSCCH. For example, the third selection window includes resource 5 and resource 6, and the control information carried by the first PSCCH indicates that resource 5 in the third selection window is reserved. In this way, the first terminal device does not send the third PSCCH on resource 5, but sends the third PSCCH on resource 6. In this way, the interference caused to the second terminal device when the first terminal device sends the third PSCCH on resource 5 can be avoided, which is conducive to increasing the possibility of successfully transmitting the third PSCCH. Alternatively, the first terminal device measures the RSRP of the detected first PSCCH or measures the RSRP of the PSSCH associated with the detected first PSCCH. If the measured RSRP is greater than the RSRP threshold, it means that the interference on resource 5 indicated by the control information carried by the first PSCCH is too large. In this way, the first terminal device does not send the third PSCCH on resource 5, but sends the third PSCCH on resource 6.

[0213] It is understandable that the first indication information in method 200 may or may not indicate the target address. If the first indication information indicates the target address, the first terminal device may not perform any processing.

[0214] It is understandable that the second terminal device in method 200 may be different from or the same as the third terminal device, and this embodiment of the present application is not limited thereto.

[0215] Optionally, method 200 may include steps S201, S204 and S205, but not steps S202 and S203. That is, regardless of whether the first indication information indicates the target address or the first service priority, the first terminal device can send a third PSCCH to the third terminal device based on the reserved resources indicated by the control information carried by the detected first PSCCH.

[0216] Optionally, if the second terminal device determines to update the candidate resource set for sending the PSCCH, the second terminal device may send third indication information, and the third indication information indicates the updated candidate resource set for sending the PSCCH. Optionally, at least part of the PSSCH associated with the first PSCCH in at least one first PSCCH in S204 may carry the third indication information, for example: each first PSCCH associated with the PSSCH in at least one first PSCCH may carry the third indication information. After the second terminal device sends at least one first PSCCH, it sends subsequent PSCCHs on the updated candidate resource set. In this way, the first terminal device that receives the first PSCCH can receive subsequent PSCCHs on the updated candidate resource set. Optionally, after the first terminal device receives a PSSCH associated with the first PSCCH, it can send the HARQ of the received PSSCH to the second terminal device. The second terminal device determines based on the HARQ that the first terminal device has received the third indication information. Therefore, the second terminal device can send subsequent PSCCHs based on the resources included in the updated candidate resource set. That is to say, the second terminal device needs to ensure that the first terminal device correctly receives the third indication information before sending subsequent PSCCHs based on the resources included in the updated candidate resource set, so as to avoid the second terminal device directly sending subsequent PSCCHs based on the updated candidate resource set. If the first terminal device does not correctly receive the third indication information, the first terminal device will continue to receive PSCCHs based on the resources included in the candidate resource set before the update, resulting in an error in receiving PSCCHs.

[0217] Optionally, the third indication information, similar to the first indication information, may also indicate a third service priority or another target address. To avoid redundancy, this embodiment of the present application does not describe this in detail. Optionally, the third service priority indicated by the third indication information may be the same as or different from the first service priority indicated by the first indication information. Optionally, the other target address indicated by the third indication information may be the same as or different from the target address indicated by the first indication information.

[0218] In the above method 200, the second terminal device sends a first indication message, and the first indication message can indicate a candidate resource set and a first service priority. The first terminal device determines a first RSRP threshold according to the first service priority. When the RSRP of the first terminal device receiving the first indication message is greater than the first RSRP threshold, the first terminal device detects the first PSCCH according to the candidate resource set, and sends a third PSCCH to the third terminal device according to the resources in the third selection window reserved by the first PSCCH. That is to say, the first terminal device can avoid the resources in the third selection window reserved by the first PSCCH in the process of sending the third PSCCH to the third terminal device, thereby improving the success rate of transmitting the third PSSCH.

[0219] In method 200, the first terminal device needs to send a third PSSCH to the third terminal device, that is, the behavior of the first terminal device sending the third PSSCH, the following method is described in conjunction with method 600, the behavior of the first terminal device receiving the first PSSCH. Figure 6 The illustrated method 600 includes:

[0220] S601, same as S201.

[0221] If the first indication information indicates the target address, S602 is executed.

[0222] S602: The first terminal device determines whether there is a service whose target address is the same as the target address indicated by the first indication information. If yes, S603 is executed. Otherwise, the method 200 ends.

[0223] Optionally, if the network device is configured or the protocol specifies a first RSRP threshold, the first terminal device may determine whether the RSRP of the received first indication information is greater than the first RSRP threshold. If the first terminal device determines that the RSRP of the received first indication information is greater than the first RSRP threshold, S602 is executed. Alternatively, after S602, the first terminal device may determine whether the RSRP of the received first indication information is greater than the first RSRP threshold. If the first terminal device determines that the RSRP of the received first indication information is greater than the first RSRP threshold, S603 is executed.

[0224] Optionally, if the first indication information indicates a first service priority, similar to method 200, the first terminal device may determine a first RSRP threshold value based on the first service priority, and the first terminal device may determine whether the RSRP of receiving the first indication information is greater than the first RSRP threshold value. If the first terminal device determines that the RSRP of receiving the first indication information is greater than the first RSRP threshold value, S602 is executed. Alternatively, after S602, the first terminal device may determine whether the RSRP of receiving the first indication information is greater than the first RSRP threshold value. If the first terminal device determines that the RSRP of receiving the first indication information is greater than the first RSRP threshold value, S603 is executed.

[0225] That is, method 600 may consider whether the RSRP of receiving the first indication information is greater than a first RSRP threshold. The first RSRP threshold may be preset or configured by the network device or determined by the first terminal device according to the first service priority. Of course, method 600 may also not consider the first RSRP threshold, and this embodiment of the present application is not limited thereto.

[0226] Optionally, the first indication information in method 600 may or may not indicate the first service priority. If the first indication information indicates the first service priority, the first terminal device may not perform any processing, or may determine the first RSRP threshold based on the first service priority.

[0227] S603, same as S204.

[0228] S604, the second terminal device sends at least one PSSCH associated with at least one first PSCCH, and the first terminal device receives the first PSSCH according to the first PSCCH detected in S603.

[0229] One PSCCH may be associated with one PSSCH. The first PSSCH is a PSSCH associated with the first PSCCH in at least one PSSCH.

[0230] Specifically, the first PSCCH may indicate resources for receiving the first PSSCH or a method for decoding the first PSSCH, and the first terminal device may receive the first PSSCH according to the first PSCCH.

[0231] Therefore, in method 600, the first indication information may indicate a candidate resource set and a target address, and the first RSRP threshold may be configured or preconfigured by the network device. If the first terminal device determines that the target address indicated by the first indication information is the same as a target address of the first terminal device, the first terminal device determines that the second terminal device has a need to send a PSSCH to the first terminal device, and therefore, the first terminal device may receive the first PSSCH associated with the first PSCCH according to the first PSCCH.

[0232] In method 200, the first terminal device needs to send a third PSSCH to the third terminal device, that is, the behavior of the first terminal device sending the third PSSCH. Method 600 describes the behavior of the first terminal device receiving the first PSSCH. The following method is described in conjunction with method 700, where the first terminal device needs to send a third PSSCH to the third terminal device, and the first terminal device receives the first PSSCH. Figure 7 The illustrated method 700 includes:

[0233] S701, same as S201.

[0234] If the first indication information indicates the first service priority, execute S602.

[0235] S702, same as S202.

[0236] S703: The first terminal device determines whether the RSRP of the received first indication information is greater than a first RSRP threshold, and if so, executes S704. Otherwise, the method 700 ends.

[0237] Optionally, the first RSRP threshold may be determined in S702 or configured or pre-configured by the network device, which is not limited in this embodiment of the present application. If the first RSRP threshold is configured or pre-configured by the network device, step S702 may not be present. That is, regardless of whether the first indication information indicates the first service priority, the first RSRP threshold in S703 may be configured or preset by the network device.

[0238] S704, same as S204.

[0239] S705, the first terminal device sends a third PSCCH to the third terminal device according to the resources reserved in the third selection window indicated by the control information carried by the first PSCCH, and the third terminal device receives the third PSCCH.

[0240] For S705 , refer to the description of S205 .

[0241] Optionally, if the first indication information indicates a target address, execute S706.

[0242] S706: The first terminal device determines whether there is a service whose target address is the same as the target address indicated by the first indication information. If yes, execute S707. Otherwise, the method 700 ends.

[0243] For S706, refer to the description of S602.

[0244] S707, the second terminal device sends at least one PSSCH associated with at least one first PSCCH, and the first terminal device receives the first PSSCH according to the first PSCCH detected in S704.

[0245] One PSCCH may be associated with one PSSCH. The first PSSCH is a PSSCH associated with the first PSCCH in at least one PSSCH.

[0246] Optionally, in method 700, the order of the steps is not limited. If S702, S703, S704, and S705 are before S706 and S707, it indicates that when the first terminal device determines that the RSRP of receiving the first indication information is greater than the first RSRP threshold, the first terminal device can detect the first PSCCH based on the resources included in the candidate resource set. After detecting the first PSCCH, it is determined based on the target address indicated by the first indication information whether the second terminal device has a need to transmit a PSSCH to the first terminal device. If there is a need to transmit a PSSCH, the first PSSCH is received based on the first PSCCH. If S706 is before S703, the execution order may be: S701, S706, S704, S707, S702, S703, S705 (wherein, there is no restriction on the order of S707 and S702 or S703, and S707 may be performed before, after, or simultaneously with S702 or S703). The first terminal device determines whether the second terminal device has a need to transmit PSSCH to the first terminal device based on the target address indicated by the first indication information. If there is a need to transmit PSSCH, the first terminal device may detect the first PSCCH based on the resources included in the candidate resource set, and after detection, receive the first PSSCH based on the first PSCCH. Then, if the first terminal device determines that the RSRP of receiving the first indication information is greater than the first RSRP threshold, the first terminal device may send the third PSSCH to the third terminal device based on the resources in the third selection window reserved by the first PSCCH. Optionally, the execution order of method 700 may also be: S701, S702, S703, S706, S704, S707, S705. Optionally, the execution order of method 700 may also be: S701, S706, S702, S703, S704, S707, S705, that is, the first terminal device detects the first PSCCH only when S703 and S706 are satisfied at the same time. That is to say, the first terminal device detects the first PSCCH only when S703 and S706 are satisfied at the same time. That is to say, in method 700, the trigger condition for the first terminal device to detect the first PSCCH may be S703 or S706, and upon detecting the first PSCCH, the first terminal device can both receive the first PSSCH and send the third PSSCH.

[0247] Optionally, in the above method embodiment, the second terminal device sends the first indication information via the PSBCH or the second PSSCH, and the second terminal device may also send the first indication information via other messages. This embodiment of the present application is not limited thereto.

[0248] In one possible implementation, the second terminal device sends the first indication information. The second terminal device sends the PSCCH on the resources included in the candidate resource set, and the first terminal device detects the PSCCH on the resources included in the candidate resource set indicated by the first indication information. That is, the second terminal device sends the PSCCH on the resources included in the candidate resource set indicated by the first indication information, and the first terminal device receives the PSCCH on the resources included in the candidate resource set indicated by the first indication information, thereby reducing the overhead of blind detection.

[0249] In one possible implementation, the second terminal device sends first indication information. The second terminal device sends the PSCCH on resources included in the candidate resource set, and the first terminal device detects the PSCCH on resources where the resources included in the candidate resource set indicated by the first indication information intersect with the resources of the first perception window. In other words, the second terminal device sends the PSCCH on resources included in the candidate resource set indicated by the first indication information, and the first terminal device receives the PSCCH in combination with the first perception window and the candidate resources.

[0250] In one possible implementation, the second terminal device sends a first indication message. The second terminal device sends a PSCCH on resources where the resources included in the candidate resource set and the resources of the first selection window determined by the second terminal device intersect, and the first terminal device detects the PSCCH on the resources included in the candidate resource set indicated by the first indication message. That is, when the second terminal device sends the PSCCH, it can refer to the resources in the candidate resource set and the resources in the first selection window, and the first terminal device receives the PSCCH on the resources included in the candidate resource set indicated by the first indication message, thereby reducing the overhead of blind detection.

[0251] In one possible implementation, the second terminal device sends a first indication message. The second terminal device sends a PSCCH on resources where the resources included in the candidate resource set and the resources of the first selection window determined by the second terminal device intersect, and the first terminal device detects the PSCCH on resources where the resources included in the candidate resource set indicated by the first indication message and the resources of the first perception window intersect. That is, when the second terminal device sends the PSCCH, it can refer to the resources in the candidate resource set and the resources in the first selection window, and the first terminal device receives the PSCCH in combination with the first perception window and the candidate resources, thereby reducing the overhead of blind detection.

[0252] It should be noted that in the embodiments of the present application, the first perception window is determined by the first terminal device. The first selection window is determined by the second terminal device. The first perception window has no relationship with the first selection window. In other words, when the first terminal device needs to transmit data, it can determine the first perception window and determine the selection window corresponding to the first perception window, such as the third selection window corresponding to the first perception window. When the second terminal device needs to transmit data, it can determine the third perception window and determine the first selection window corresponding to the third perception window.

[0253] It can be understood that sending the first indication information through the second PSSCH can be understood as that the second terminal device can send the first indication information with the help of the second PSSCH, the first indication information can be carried in the MAC CE or RRC signaling or SCI2 sent through the second PSSCH, or the first indication information can be carried in other information other than MAC CE or RRC signaling or SCI2. The embodiments of the present application do not limit this.

[0254] It is understandable that the execution order of the above method embodiments is not limited by the numbering, and the execution order can be determined according to the internal logic. As long as there is no contradiction, the execution order of the method can be changed.

[0255] It is understood that the above method embodiments can be independent embodiments or embodiments that can be combined with each other. Steps in different method embodiments can be combined with each other to form another embodiment, and steps in the same method embodiment can also be combined with each other to form another embodiment.

[0256] It can be understood that the methods and operations implemented by the terminal device in the above-mentioned method embodiments can also be implemented by components that can be used for the terminal device (such as chips or circuits), and the methods and operations implemented by the network device in the above-mentioned method embodiments can also be implemented by components that can be used for the network device (such as chips or circuits).

[0257] The above describes the method embodiments provided by this application, and the following describes the device embodiments provided by this application. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, for matters not described in detail, reference can be made to the method embodiments above. For the sake of brevity, they will not be repeated here.

[0258] Figure 8 1 shows a communication device 800 provided in an embodiment of the present application. The communication device 800 includes a processor 810 and a transceiver 820. The processor 810 and the transceiver 820 communicate with each other via an internal connection path. The processor 810 is used to execute instructions to control the transceiver 820 to send and / or receive signals.

[0259] Optionally, the communication device 800 may further include a memory 830, which communicates with the processor 810 and the transceiver 820 via an internal connection path. The memory 830 is used to store instructions, and the processor 810 can execute the instructions stored in the memory 830. In one possible implementation, the communication device 800 is used to implement the various processes and steps corresponding to the first terminal device in the above-mentioned method embodiment. In another possible implementation, the communication device 800 is used to implement the various processes and steps corresponding to the second terminal device in the above-mentioned method embodiment.

[0260] It should be understood that the communication device 800 can be specifically the first terminal device or the second terminal device in the above-mentioned embodiment, or it can be a chip or a chip system. Correspondingly, the transceiver 820 can be the transceiver circuit of the chip, which is not limited here. Specifically, the communication device 800 can be used to execute the various steps and / or processes corresponding to the first terminal device or the second terminal device in the above-mentioned method embodiment. Optionally, the memory 830 can include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory can also include a non-volatile random access memory. For example, the memory can also store device type information. The processor 810 can be used to execute instructions stored in the memory, and when the processor 810 executes the instructions stored in the memory, the processor 810 is used to execute the various steps and / or processes of the above-mentioned method embodiment corresponding to the first terminal device or the second terminal device.

[0261] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0262] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0263] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0264] According to the method provided in the embodiment of the present application, the present application also provides a computer program product, which includes: computer program code, when the computer program code is run on a computer, it enables the computer to execute the various steps or processes executed by the first terminal device or the second terminal device in the above method embodiment.

[0265] According to the method provided in the embodiment of the present application, the present application also provides a computer-readable storage medium, which stores program code. When the program code runs on a computer, the computer executes the various steps or processes performed by the first terminal device or the second terminal device in the above method embodiment.

[0266] According to the method provided in the embodiment of the present application, the present application also provides a communication system, which includes the aforementioned one or more first terminal devices and one or more second terminal devices.

[0267] The above-mentioned various apparatus embodiments correspond completely to the method embodiments, and the corresponding modules or units perform the corresponding steps. For example, the communication unit (transceiver) performs the receiving or sending steps in the method embodiments, and other steps except sending and receiving can be performed by the processing unit (processor). The functions of the specific units can be based on the corresponding method embodiments. There can be one or more processors.

[0268] In this application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information is called information to be indicated. In the specific implementation process, there may be many ways to indicate the information to be indicated, such as but not limited to, directly indicating the information to be indicated, such as indicating the information to be indicated itself or the index of the information to be indicated. The information to be indicated may also be indirectly indicated by indicating other information, wherein the other information is associated with the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information may be achieved by means of the arrangement order of each information agreed in advance (such as specified in the protocol), thereby reducing the indication overhead to a certain extent.

[0269] In the embodiments of this application, each term and English abbreviation is provided for convenience of description and shall not constitute any limitation to this application. This application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0270] Those skilled in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0271] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can be based on the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0272] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0273] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0274] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0275] In the above embodiments, the functions of each functional unit can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can 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 can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0276] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0277] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for detecting a physical sidelink control channel (PSCCH), characterized in that: The method is applicable to a first terminal device, and includes: Receive first indication information, where the first indication information is used to indicate a candidate resource set and a first service priority, where resources included in the candidate resource set are candidate resources for the second terminal device to send a PSCCH; Determine a first RSRP threshold according to the first service priority; If the reference signal received power RSRP corresponding to the received first indication information is greater than a first RSRP threshold, a first PSCCH is detected according to the resources included in the candidate resource set indicated by the first indication information.

2. The method according to claim 1, characterized in that The determining a first RSRP threshold according to the first service priority includes: The first RSRP threshold is determined according to the first service priority and the second service priority of the first terminal device.

3. The method according to claim 1 or 2, characterized in that The first indication information is further used to indicate a target address, where the target address indicated by the first indication information is an address corresponding to a service, and detecting a first PSCCH based on resources included in the candidate resource set indicated by the first indication information includes: If the target address of a service of the first terminal device is the same as the target address indicated by the first indication information, detecting a first PSCCH according to the resources included in the candidate resource set indicated by the first indication information; The method further comprises: A first physical sidelink shared channel (PSSCH) associated with the first PSCCH is received according to the first PSCCH.

4. The method according to any one of claims 1 to 3, characterized in that include: receiving radio resource control RRC signaling through a second PSSCH, where the RRC signaling carries the first indication information; or, receiving a media access control layer element MAC CE through the second PSSCH, where the MAC CE carries the first indication information; or, Second-stage sidelink control information SCI2 is received through the second PSSCH, where the SCI2 carries the first indication information.

5. The method according to claim 4, characterized in that The method further comprises: Sidelink control information SCI associated with the second PSSCH is received, where the SCI includes second indication information, where the second indication information is used to indicate that the second PSSCH carries the first indication information.

6. The method according to any one of claims 1 to 3, characterized in that The receiving first indication information includes: A physical sidelink broadcast channel (PSBCH) is received, where the PSBCH includes the first indication information.

7. The method according to any one of claims 1 to 6, characterized in that The receiving first indication information includes: The first indication information is received on a pre-configured candidate resource or a candidate resource configured by a network device.

8. The method according to any one of claims 1 to 7, characterized in that The detecting a first PSCCH based on resources included in the candidate resource set indicated by the first indication information includes: Determine resources in which the resources in the candidate resource set indicated by the first indication information intersect with the resources in the first perception window; The first PSCCH is detected on the resources where the intersection exists.

9. A method for detecting a physical sidelink control channel (PSCCH), characterized in that: The method is applicable to a second terminal device, and includes: Sending first indication information, where the first indication information is used to indicate a candidate resource set and a first service priority, where the resources included in the candidate resource set are candidate resources for the second terminal device to send a PSCCH, and the first service priority is used to determine a first RSRP threshold, which is used by the first terminal device to determine whether to detect a first PSCCH based on the resources included in the candidate resource set; At least one first PSCCH is sent according to the resources included in the candidate resource set indicated by the first indication information.

10. The method according to claim 9, characterized in that The first indication information is further used to indicate a target address, and the target address indicated by the first indication information is an address corresponding to the service; the method further includes: At least one physical sidelink shared channel PSSCH associated with the at least one first PSCCH is sent according to the at least one first PSCCH.

11. The method according to claim 9 or 10, characterized in that The method further comprises: Sending radio resource control RRC signaling via a second PSSCH, where the RRC signaling carries the first indication information; or, Sending a media access control layer element MAC CE through a second PSSCH, where the MAC CE carries the first indication information; or, The second-stage sidelink control information SCI2 is sent through the second PSSCH, where the SCI2 carries the first indication information.

12. The method according to claim 11, characterized in that The method further comprises: Sidelink control information SCI associated with the second PSSCH is sent, where the SCI includes second indication information, and the second indication information is used to indicate that the second PSSCH carries the first indication information.

13. The method according to claim 9 or 10, characterized in that The sending of the first indication information includes: A physical sidelink broadcast channel PSBCH is sent, where the PSBCH includes the first indication information.

14. The method according to any one of claims 9 to 13, characterized in that The sending of the first indication information includes: The first indication information is sent according to preconfigured candidate resources or candidate resources configured by the network device.

15. The method according to claim 14, characterized in that The sending of the first indication information according to the preconfigured candidate resources or the candidate resources configured by the network device includes: receiving at least one second PSCCH in a second perception window; Determining resources in a reserved second selection window according to the at least one second PSCCH; sending the first indication information according to the reserved resources in the second selection window and the preconfigured candidate resources, or; The first indication information is sent according to the reserved resources in the second selection window and the candidate resources configured by the network device.

16. The method according to any one of claims 9 to 15, characterized in that The sending at least one first PSCCH using resources included in the candidate resource set indicated by the first indication information includes: Determine resources that intersect between resources included in the candidate resource set indicated by the first indication information and resources in the first selection window; The at least one first PSCCH is sent on the resources where there is an intersection.

17. A communication device, characterized in that: comprising a processor for executing the method according to any one of claims 1 to 16.

18. A communication device, characterized in that: The method comprises a processor and a memory, wherein the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions in the memory, so that the method according to any one of claims 1 to 16 is executed.

19. A computer-readable storage medium, characterized in that A program or instruction for implementing the method according to any one of claims 1 to 16 is stored.

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