Communication method and device

Abstract

The present application relates to the technical field of wireless communications, and provides a communication method and device. By means of the present application, when the working bandwidths of two terminal devices are different, the numbers of bits of sidelink control information determined by the two terminal devices are the same. The method comprises: a first terminal device determines a first resource set, wherein the bandwidth of the first resource set is less than or equal to a bandwidth supported by the first terminal device; the first terminal device receives first information from a second terminal device, wherein the first information comprises frequency domain information of a second resource set, the bandwidth of the second resource set is greater than the bandwidth supported by the first terminal device, and the second resource set overlaps the first resource set; the first terminal device sends and / or receives first sidelink control information in a first resource set, wherein the first sidelink control information comprises first frequency resource indication information, the first frequency resource indication information indicates the frequency domain position of a first resource, and the number of bits of the first frequency resource indication information is determined on the basis of the frequency domain information of the second resource set.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on June 16, 2023, with application number 202310729940.3 and application name “A resource indication method and device”, and the Chinese patent application filed with the State Intellectual Property Office on August 7, 2023, with application number 202310990315.4 and application name “A communication method and device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless communications, and in particular to a communication method and device. Background Art

[0003] In a sidelink (SL) communication system, sidelink control information (SCI) is the control information transmitted between different terminal devices. On the transmitting side, a terminal device sends SCI according to a specific SCI size. On the receiving side, the terminal device decodes the SCI according to the SCI size. The SCI includes frequency resource indication information, the number of bits of which is determined by the bandwidth of the resource pool (pre-configured) for the terminal device.

[0004] However, if two terminal devices are (pre)configured with different resource pool bandwidth sizes, the SCI sizes determined by the two terminal devices are different; when the two resource pools with different bandwidth sizes overlap, and the two terminal devices send and / or receive SCI in the overlapping part of the resource pool, the two terminal devices are unable to decode each other's SCI or need to blindly detect SCI of different formats.

[0005] Summary of the Invention

[0006] To solve the above technical problems, the present application provides a communication method and apparatus that enables two terminal devices to have different operating bandwidths (e.g., different bandwidths of (pre-)configured resource pools) while maintaining the same SCI size (or the number of SCI bits), thereby preventing the terminal devices from being unable to correctly decode the other party's side control information or requiring blind detection of side control information in different formats. To achieve the above objectives, the present application adopts the following technical solutions:

[0007] In a first aspect, a communication method is provided. The method may be performed by a first terminal device, which may be a first terminal device, a component (e.g., a processor, a chip, or a chip system) applied to the first terminal device, or a logic module or software capable of implementing all or part of the functions of the first terminal device. The following description uses the first terminal device as an example. The method includes: the first terminal device determines a first resource set, where the bandwidth of the first resource set is less than or equal to the bandwidth supported by the first terminal device. The first terminal device receives first information from a second terminal device, where the first information includes frequency domain information of a second resource set, the bandwidth of the second resource set is greater than the bandwidth supported by the first terminal device, and the second resource set partially or completely overlaps with the first resource set. The first terminal device transmits and / or receives first sidelink control information within the first resource set, where the first sidelink control information includes first frequency resource indication information, where the first frequency resource indication information indicates the frequency domain location of a first resource, the first resource being used to transmit sidelink information, and the number of bits of the first frequency resource indication information being determined based on the frequency domain information of the second resource set.

[0008] Among them, the number of bits of the first frequency resource indication information is determined according to the frequency domain information of the second resource set. It can be understood that the first frequency resource indication information indicates the position of the sidelink resources occupied or reserved by the first terminal device within the frequency domain range of the second resource set.

[0009] For example, the first resource set is a resource pool with a smaller bandwidth. Frequency domain information of the first resource set is predefined or preconfigured in configuration information of the first terminal device, or is configured for the first terminal device by a network device.

[0010] For another example, the second resource set is a resource pool with a larger bandwidth. The frequency domain information of the second resource set is predefined or preconfigured in the configuration information of the second terminal device, or is configured for the second terminal device by the network device. Alternatively, the frequency domain information of the second resource set is predefined or preconfigured in the configuration information of another terminal device, or is configured for the another terminal device by the network device. The another terminal device is a terminal device other than the second terminal device.

[0011] That is, the first terminal device is able to dynamically obtain the frequency domain information of the second resource set, and then determine the number of bits of the first frequency resource indication information based on the dynamically obtained frequency domain information of the second resource set. The first terminal device determines the size of the first sideline control information based on the number of bits of the first frequency resource indication information. In this way, when the frequency domain information of the second resource set is updated, the number of bits of the first frequency resource indication information is also adjusted accordingly, thereby enabling the first terminal device to adaptively adjust the number of bits of the first sideline control information.

[0012] In this way, when the first terminal device sends the first side control information, even if the first terminal device and the terminal device receiving the first side control information operate in resource sets with different bandwidth sizes, the size of the side control information determined by the above two terminal devices (i.e., the first terminal device and the terminal device receiving the first side control information) can be the same, thereby enabling the first side control information sent by the first terminal device to be successfully received and decoded, which helps to increase the probability of the first side control information being successfully received and decoded.

[0013] When the first terminal device receives the first side control information, even if the first terminal device and the terminal device sending the first side control information operate in resource sets with different bandwidth sizes, the size of the side control information determined by the above two terminal devices (i.e., the first terminal device and the terminal device sending the first side control information) can be the same, thereby enabling the first side control information to be successfully received and decoded by the first terminal device, which helps to increase the probability of the first side control information being successfully received and decoded, and eliminates the need for blind detection of side control information of different formats.

[0014] In one possible design, the first resource is located within the first resource set and within the second resource set.

[0015] In this way, the first terminal device can send sideline information in the first resource and can also receive sideline information from the second type of terminal device in the first resource.

[0016] In one possible design, the first information includes at least one of the following: the bandwidth size of the second resource set, or the number of frequency domain units included in the second resource set, or the frequency domain starting position of the second resource set, or the frequency domain ending position of the second resource set.

[0017] In this way, after receiving the first information, the first terminal device can determine the bandwidth size of the second resource set according to the first information.

[0018] In one possible design, the value of the first frequency resource indication information is determined based on the frequency domain unit index of the first resource in the second resource set.

[0019] In one possible design, the frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined based on the frequency domain unit index of the frequency domain unit in the first resource set in the second resource set.

[0020] In this way, when the first terminal device sends the first sidelink control information, the first frequency resource indication information included in the first sidelink control information can be correctly interpreted or understood by the second type terminal device, thereby enabling the second type terminal device to determine the frequency domain position of the first resource based on the first frequency resource indication information. Furthermore, when the first terminal device receives the first sidelink control information from the second type terminal device, the first terminal device can correctly interpret or understand the first frequency resource indication information included in the first sidelink control information, thereby determining the frequency domain position of the first resource based on the first frequency resource indication information.

[0021] In one possible design, the frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined based on a first frequency domain offset, where the first frequency domain offset is the frequency domain offset of the first resource set relative to the second resource set.

[0022] The first frequency domain offset may be understood as the frequency domain offset between the first resource set and the second resource set.

[0023] In one possible design, the first information includes the first frequency domain offset.

[0024] That is, the first terminal device obtains the first frequency domain offset from the first information, thereby simplifying the calculation complexity on the first terminal device side.

[0025] In one possible design, the method also includes: the first terminal device determines the first frequency domain offset based on the frequency domain starting position of the second resource set and the frequency domain starting position of the first resource set, and the first information includes the frequency domain starting position of the second resource set.

[0026] That is, when the first information includes the frequency domain starting position of the second resource set, the first information may not need to additionally include frequency domain offset information, such as the first frequency domain offset, to save signaling overhead.

[0027] In one possible design, the first terminal device receives the first information from the second terminal device, including: the first terminal device receives the first information from the second terminal device within a third resource set, and the frequency domain information of the third resource set is predefined or preconfigured in the configuration information of the first terminal device, or is configured for the first terminal device by a network device.

[0028] That is, the first terminal device dynamically obtains the first information within the third resource set, laying the foundation for dynamically determining the number of bits of the first frequency resource indication information.

[0029] In one possible design, the third resource set is located within the first part of the bandwidth BWP and within the second BWP; wherein, the frequency domain information of the first BWP is predefined or preconfigured in the configuration information of the first terminal device, or is configured by the network device for the first terminal device; the frequency domain information of the second BWP is predefined or preconfigured in the configuration information of the second terminal device, or is configured by the network device for the second terminal device.

[0030] In one possible design, the method also includes: the first terminal device sends and / or receives second sidelink control information within the third resource set, the second sidelink control information includes second frequency resource indication information, the second frequency resource indication information indicates the frequency domain position of the second resource, the second resource is used to send sidelink information, and the number of bits of the second frequency resource indication information is determined based on the frequency domain information of the third resource set.

[0031] In this way, the second sidelink control information sent by the first terminal device in the third resource set can be received and decoded by other terminal devices. In addition, the first terminal device can also receive and decode sidelink control information of other terminal devices in the third resource set.

[0032] In one possible design, the method further includes: the first terminal device sending second information to the second terminal device within the third resource set, the second information including frequency domain information of the first resource set. The first terminal device receives first indication information from the second terminal device within the third resource set, the first indication information instructing the first terminal device to switch to the first resource set, the first indication information being determined based on the second information.

[0033] That is to say, for the first terminal device, when the second terminal device initiates resource set switching, the first terminal device receives the first indication information and switches according to the first indication information, such as switching from the third resource set to the first resource set.

[0034] In one possible design, the first information includes a second frequency domain offset, where the second frequency domain offset is the frequency domain offset of the third resource set relative to the second resource set.

[0035] The second frequency domain offset may be understood as the frequency domain offset between the third resource set and the second resource set.

[0036] That is, the first terminal device obtains the second frequency domain offset from the first information, thereby simplifying the calculation complexity on the first terminal device side.

[0037] In one possible design, the method further includes: the first terminal device determines a first frequency domain offset based on the second frequency domain offset, where the first frequency domain offset is a frequency domain offset of the first resource set relative to the second resource set.

[0038] That is to say, when the first information does not include the first frequency domain offset, and the first information includes the bandwidth size of the second resource set (that is, the first terminal device cannot know the frequency domain starting position and the frequency domain ending position of the second resource set), the first terminal device obtains the second frequency domain offset from the first information, and then determines the first frequency domain offset based on the second frequency domain offset.

[0039] In this way, when the first information includes the second frequency domain offset, the first information may not need to include other additional information, such as the first frequency domain offset or the frequency domain starting position of the second resource set or the frequency domain ending position of the second resource set, so as to save signaling overhead.

[0040] In one possible design, determining, by the first terminal apparatus, a first frequency domain offset based on the second frequency domain offset includes: determining, by the first terminal apparatus, the first frequency domain offset based on the second frequency domain offset and a third frequency domain offset, where the third frequency domain offset is a frequency domain offset of the first resource set relative to the third resource set.

[0041] The third frequency domain offset may be understood as the frequency domain offset between the first resource set and the third resource set.

[0042] In one possible design, the method also includes: the first terminal device obtains first configuration information, the first configuration information including frequency domain information of the first resource set and / or frequency domain information of the third resource set; the first terminal device determines a third frequency domain offset based on the first configuration information, and the third frequency domain offset is the frequency domain offset of the first resource set relative to the third resource set.

[0043] That is, the first terminal device may determine the third frequency domain offset according to the first configuration information. In this case, the first information may not need to additionally include frequency domain offset information, such as the third frequency domain offset, to save signaling overhead.

[0044] In one possible design, the first terminal device obtains the first configuration information, including: the first terminal device receives the first configuration information from a network device. In other words, the network device configures the first configuration information for the first terminal device.

[0045] In one possible design, the first configuration information is predefined or preconfigured in the configuration information of the first terminal device to save signaling overhead.

[0046] In one possible design, the third resource set overlaps with or does not overlap with the second resource set at all.

[0047] The third resource set overlaps with the second resource set, which can be understood as: the third resource set is included in the second resource set, or the third resource set partially overlaps with the second resource set.

[0048] In one possible design, the third resource set does not overlap with the first resource set at all.

[0049] In one possible design, the bandwidth of the third resource set is less than or equal to the bandwidth supported by the first terminal device.

[0050] In one possible design, the first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device, wherein a bandwidth supported by the first type of terminal device is smaller than a bandwidth supported by the second type of terminal device.

[0051] That is, the first sidelink control information can be successfully received and decoded by the first type terminal device and / or the second type terminal device.

[0052] In one possible design, the first information is carried in a discovery message or a radio resource control RRC message.

[0053] In one possible design, the first information is carried in a first synchronization signal.

[0054] That is, the first terminal device dynamically obtains the first information by receiving the first synchronization signal, laying a foundation for dynamically determining the number of bits of the first frequency resource indication information.

[0055] In one possible design, the first synchronization signal includes a physical sidelink broadcast channel PSBCH, and the first information is carried on the PSBCH.

[0056] In one possible design, the method further includes: the first terminal device determining a first synchronization resource and a second synchronization resource, wherein the first synchronization resource is used to send and / or receive a first type of synchronization signal, the first type of synchronization signal being a synchronization signal carrying the first information, and the second synchronization resource is used to send and / or receive a second type of synchronization signal, the second type of synchronization signal being a synchronization signal not carrying the first information.

[0057] That is to say, in the SL communication system, different types of synchronization signals are transmitted through different types of synchronization resources, laying the foundation for avoiding conflicts between different types of PSBCHs.

[0058] In one possible design, the first terminal device receives the first information from the second terminal device, including: the first terminal device receives the first information from the second terminal device in the first synchronization resource.

[0059] That is, in the SL communication system, different types of synchronization signals are transmitted through different types of synchronization resources, thereby avoiding conflicts between different types of PSBCHs and increasing the possibility of successful PSBCH decoding.

[0060] In one possible design, the first information includes a fourth frequency domain offset, where the fourth frequency domain offset is the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the second resource set.

[0061] The fourth frequency domain offset may be understood as the frequency domain offset between the frequency domain resources where the first synchronization signal is located and the frequency domain resources of the second resource set.

[0062] That is, the first terminal device obtains the fourth frequency domain offset from the first information, thereby simplifying the calculation complexity on the first terminal device side.

[0063] In one possible design, the method further includes: the first terminal device determines a first frequency domain offset based on the fourth frequency domain offset, where the first frequency domain offset is the frequency domain offset of the first resource set relative to the second resource set.

[0064] That is to say, when the first information does not include the first frequency domain offset, and the first information includes the bandwidth size of the second resource set (that is, the first terminal device cannot know the frequency domain starting position and the frequency domain ending position of the second resource set), the first terminal device obtains the fourth frequency domain offset from the first information, and then determines the first frequency domain offset based on the fourth frequency domain offset.

[0065] In this way, when the first information includes the fourth frequency domain offset, the first information may not need to additionally include other information, such as the first frequency domain offset, so as to save signaling overhead.

[0066] In one possible design, the first terminal device determines the first frequency domain offset based on the fourth frequency domain offset, including: the first terminal device determines the first frequency domain offset based on the fourth frequency domain offset and the fifth frequency domain offset, and the fifth frequency domain offset is the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the first resource set.

[0067] The fifth frequency domain offset can be understood as the frequency domain offset between the frequency domain resources where the first synchronization signal is located and the frequency domain resources of the first resource set.

[0068] In one possible design, the method further includes: the first terminal device obtaining second configuration information, where the second configuration information includes frequency domain information of the first resource set and / or frequency domain information of the first synchronization signal. The first terminal device determines a fifth frequency domain offset based on the second configuration information, where the fifth frequency domain offset is a frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the first resource set.

[0069] That is, the first terminal device may determine the fifth frequency domain offset according to the second configuration information. In this case, the first information may not need to additionally include frequency domain offset information, such as the fifth frequency domain offset, to save signaling overhead.

[0070] In one possible design, the first terminal device obtains the second configuration information, including: the first terminal device receives the second configuration information from a network device. In other words, the network device configures the second configuration information for the first terminal device.

[0071] In one possible design, the second configuration information is predefined or preconfigured in the configuration information of the first terminal device to save signaling overhead.

[0072] In one possible design, the first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device; or, the first terminal device and the second terminal device belong to the first type of terminal device, and the first information is information obtained by the second terminal device from a third terminal device. The bandwidth supported by the first type of terminal device is smaller than the bandwidth supported by the second type of terminal device.

[0073] That is, the first sidelink control information can be received and decoded by the first type terminal device and / or the second type terminal device.

[0074] In one possible design, the first sidelink control information is first-order sidelink control information SCI.

[0075] In one possible design, the first sidelink control information is carried on a physical sidelink control channel PSCCH.

[0076] In a second aspect, a communication method is provided. The execution subject of the method may be a second terminal device, which may be a second terminal device, or a component (such as a processor, chip, or chip system) applied to the second terminal device, or a logic module or software that can implement all or part of the functions of the second terminal device. The following description takes the execution subject being the second terminal device as an example. The method includes: the second terminal device sends first information to the first terminal device, the first information including frequency domain information of a second resource set, and the bandwidth of the second resource set is greater than the bandwidth supported by the first terminal device. The second terminal device receives first sidelink control information from the first terminal device, the first sidelink control information including first frequency resource indication information, the first frequency resource indication information indicating the frequency domain position of a first resource, the first resource being used to send sidelink information, the number of bits of the first frequency resource indication information being determined based on the frequency domain information of the second resource set, the first resource being located within the first resource set and within the second resource set, and the first resource set being the sidelink resource set determined by the first terminal device.

[0077] In one possible design, the first information includes at least one of the following: the bandwidth size of the second resource set, or the number of frequency domain units included in the second resource set, or the frequency domain starting position of the second resource set, or the frequency domain ending position of the second resource set.

[0078] In one possible design, the value of the first frequency resource indication information is determined based on the frequency domain unit index of the first resource in the second resource set.

[0079] In one possible design, the second terminal device sends the first information to the first terminal device, including: the second terminal device sends the first information to the first terminal device within a third resource set, and the frequency domain information of the third resource set is predefined or preconfigured in the configuration information of the second terminal device, or is configured for the second terminal device by a network device.

[0080] In one possible design, the third resource set is located within the first partial bandwidth BWP and within the second BWP. Frequency domain information of the first BWP is predefined or preconfigured in configuration information of the first terminal device, or is configured by the network device for the first terminal device; frequency domain information of the second BWP is predefined or preconfigured in configuration information of the second terminal device, or is configured by the network device for the second terminal device.

[0081] In one possible design, the method also includes: the second terminal device sends and / or receives second sidelink control information within the third resource set, the second sidelink control information includes second frequency resource indication information, the second frequency resource indication information indicates the frequency domain position of the second resource, the second resource is used to send sidelink information, and the number of bits of the second frequency resource indication information is determined based on the frequency domain information of the third resource set.

[0082] In one possible design, the method further includes: the second terminal device receiving second information from the first terminal device within the third resource set, the second information including frequency domain information of the first resource set; and the second terminal device sending first indication information to the first terminal device within the third resource set, the first indication information instructing the first terminal device to switch to the first resource set, the first indication information being determined based on the second information.

[0083] In one possible design, the first information includes a second frequency domain offset, where the second frequency domain offset is the frequency domain offset of the third resource set relative to the second resource set.

[0084] In one possible design, the third resource set overlaps with or does not overlap with the second resource set at all.

[0085] In one possible design, the third resource set does not overlap with the first resource set at all.

[0086] In one possible design, the bandwidth of the third resource set is less than or equal to the bandwidth supported by the first terminal device.

[0087] In one possible design, the first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device, wherein a bandwidth supported by the first type of terminal device is smaller than a bandwidth supported by the second type of terminal device.

[0088] In one possible design, the first information is carried in a discovery message or a radio resource control RRC message.

[0089] In one possible design, the first information is carried in a first synchronization signal.

[0090] In one possible design, the first synchronization signal includes a physical sidelink broadcast channel PSBCH, and the first information is carried on the PSBCH.

[0091] In one possible design, the method further includes: the second terminal device determining a first synchronization resource and a second synchronization resource, wherein the first synchronization resource is used to send and / or receive a first type of synchronization signal, the first type of synchronization signal being a synchronization signal carrying the first information; and the second synchronization resource is used to send and / or receive a second type of synchronization signal, the second type of synchronization signal being a synchronization signal not carrying the first information.

[0092] In one possible design, the second terminal device sending the first information to the first terminal device includes: the second terminal device sending the first information to the first terminal device within the first synchronization resource.

[0093] In one possible design, the first information includes a fourth frequency domain offset, where the fourth frequency domain offset is the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the second resource set.

[0094] In one possible design, the first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device; or, the first terminal device and the second terminal device belong to the first type of terminal device, and the first information is information obtained by the second terminal device from a third terminal device. The bandwidth supported by the first type of terminal device is smaller than the bandwidth supported by the second type of terminal device.

[0095] In one possible design, the first sidelink control information is first-order sidelink control information SCI.

[0096] In one possible design, the first sidelink control information is carried on a physical sidelink control channel PSCCH.

[0097] In one possible design, the frequency domain information of the first resource set is predefined or preconfigured in the configuration information of the first terminal device, or is configured for the first terminal device by a network device.

[0098] In one possible design, the frequency domain information of the second resource set is predefined or preconfigured in the configuration information of the second terminal device, or is configured for the second terminal device by a network device.

[0099] Among them, the technical effects brought about by the second aspect and any design method in the second aspect can refer to the technical effects brought about by the first aspect and the corresponding design method in the first aspect, and will not be repeated here.

[0100] In a third aspect, a communication device is provided for implementing the various methods described above. The communication device includes modules, units, or means corresponding to the methods. The modules, units, or means may be implemented in hardware, software, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules or units corresponding to the functions.

[0101] In some possible designs, the communication device may include a processing module and a transceiver module. The processing module may be used to implement the processing functions in any of the above aspects and any possible implementations thereof. The transceiver module, also referred to as a transceiver unit, is used to implement the sending and / or receiving functions in any of the above aspects and any possible implementations thereof. The transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0102] In some possible designs, the transceiver module includes a sending module and / or a receiving module, which are used to implement the sending or receiving functions in any of the above aspects and any possible implementation methods.

[0103] In a fourth aspect, a communication device is provided, comprising: a processor and a memory, wherein the processor and the memory are coupled, and the memory stores program instructions. When the program instructions stored in the memory are executed by the processor, the communication device executes a method as in any one of the above aspects or any possible design of any one of the aspects.

[0104] In a fifth aspect, a communication device is provided, comprising: a processor; the processor is configured to execute a computer program or instruction so that the communication device executes the method described in any one of the aspects.

[0105] Optionally, the communication device further includes a memory, which may be coupled to the processor, or may exist independently of the processor, for example, the memory and the processor are two independent modules. The memory may be located outside the communication device or inside the communication device.

[0106] In a sixth aspect, a computer-readable storage medium is provided, wherein a computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is executed on a communication device, the communication device can execute the method described in any one of the aspects.

[0107] In a seventh aspect, a computer program product comprising instructions is provided, which, when executed on a communication device, enables the communication device to execute the method described in any one of the aspects.

[0108] The communication device provided in any of aspects 3 to 7 may be the first terminal device described in aspect 1, such as a chip or a chip system; alternatively, the communication device may be the second terminal device described in aspect 2, such as a chip or a chip system. When the device is a chip system, it may be composed solely of a chip or may include a chip and other discrete components.

[0109] It can be understood that when the communication device provided in any one of the third to seventh aspects is a chip, the sending action / function of the communication device can be understood as output information, and the receiving action / function of the communication device can be understood as input information.

[0110] Among them, the technical effects brought about by any design method in the third to seventh aspects can refer to the technical effects brought about by different design methods in the first to second aspects, and will not be repeated here.

[0111] In an eighth aspect, a communication system is provided, comprising a first terminal device and a second terminal device. The first terminal device is configured to perform the method of the first aspect or any possible design of the first aspect, and the second terminal device is configured to perform the method of the second aspect or any possible design of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application.

[0113] FIG2 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application.

[0114] FIG3 a is a schematic diagram of the structure of a resource pool provided in an embodiment of the present application.

[0115] FIG3 b is a schematic diagram of the structure of another resource pool provided in an embodiment of the present application.

[0116] FIG4 is a schematic diagram of resource distribution provided in an embodiment of the present application.

[0117] FIG5 is another schematic diagram of resource distribution provided in an embodiment of the present application.

[0118] FIG6 is a flow chart of a communication method provided in an embodiment of the present application.

[0119] FIG7 is another schematic diagram of resource distribution provided in an embodiment of the present application.

[0120] FIG8 is another schematic diagram of resource distribution provided in an embodiment of the present application.

[0121] FIG9 is another schematic diagram of resource distribution provided in an embodiment of the present application.

[0122] FIG10 is a flow chart of another communication method provided in an embodiment of the present application.

[0123] FIG11 is a flow chart of another communication method provided in an embodiment of the present application.

[0124] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0125] FIG13 is a schematic structural diagram of another communication device provided in an embodiment of the present application.

[0126] FIG14 is a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0127] The technical solution in this application will be described below with reference to the accompanying drawings.

[0128] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as universal mobile telecommunications system (UMTS), wireless local area network (WLAN), wireless fidelity (Wi-Fi) system, wired network, vehicle to everything (V2X) communication system, device-to-device (D2D) communication system, Internet of Vehicles communication system, 4th generation (4G) mobile communication system, such as long term evolution (LTE) system, world wide interoperability for microwave access (WiMAX) communication system, 5th generation (5G) mobile communication system, such as new radio (NR) system, 6th generation (6G) mobile communication system, indoor commercial scene communication system, etc., and the embodiments of the present application do not specifically limit this. Indoor commercial scenes include scenes such as terminal devices (such as mobile phones) projecting screens to screens and virtual reality (VR) games. Furthermore, the term "system" and "network" can be used interchangeably.

[0129] This application will present various aspects, embodiments, or features in the context of systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Furthermore, combinations of these aspects may also be used.

[0130] Additionally, in the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as an "example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of the word "example" is intended to present concepts in a concrete manner.

[0131] In the embodiments of the present application, “of”, “corresponding”, “relevant” and “corresponding” may sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

[0132] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0133] FIG1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in FIG1 , the communication system 1000 includes at least one network device (such as 110a and 110b in FIG1 ) and at least one terminal device (such as 120a-120j in FIG1 ). The terminal device can communicate with the network device wirelessly. Alternatively, different network devices can communicate with each other. Alternatively, different terminal devices can communicate with each other.

[0134] It should be pointed out that Figure 1 is only a schematic diagram. Although not shown, the communication system 1000 can also include other network devices. For example, the communication system 1000 can also include one or more core network (CN) devices, wireless relay devices and wireless backhaul devices, which are not specifically limited here.

[0135] The network device may be connected to the core network device via a wireless or wired connection. The core network device and the network device may be independent and different physical devices, or the functions of the core network device and the logical functions of the network device may be integrated into the same physical device, or the functions of some core network devices and some network devices may be integrated into one physical device. This embodiment of the present application does not specifically limit this.

[0136] Optionally, the network device may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system; or a module or unit that performs some functions of a base station. For example, it may be a centralized unit (CU) or a distributed unit (DU). The CU here completes the functions of the radio resource control (RRC) protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control (RLC) layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical (PHY) layer or all of the physical layer. For a detailed description of each of the above protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific equipment form adopted by the network device. For the convenience of description, the following description is taken as an example.

[0137] Optionally, the terminal device accesses the core network via a network device. The terminal device includes a device that provides voice and / or data connectivity to the user. Specifically, it includes a device that provides voice to the user, a device that provides data connectivity to the user, or a device that provides both voice and data connectivity to the user. For example, it may include a handheld device with wireless connectivity or a processing device connected to a wireless modem. The terminal device can communicate with the core network via the radio access network, exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal device may include user equipment (UE), wireless terminal device, mobile terminal device, D2D terminal device, V2X terminal device, machine-to-machine / machine-type communications (M2M / MTC) terminal device, Internet of Things (IoT) terminal device, subscriber unit, subscriber station, mobile station, remote station, access point (AP), remote terminal, access terminal, user terminal, user agent, or user device, etc. For example, it may include a mobile phone (or so-called "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. Examples include personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, and personal digital assistants (PDAs). Also included are limited devices, such as those with low power consumption, limited storage capacity, or limited computing power. Examples include information sensing devices such as barcode scanners, radio frequency identification (RFID), sensors, global positioning systems (GPS), and laser scanners.

[0138] The various terminal devices introduced above, if located on a vehicle (eg, placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBUs).

[0139] In the embodiment of the present application, the terminal device may further include a relay. Alternatively, it can be understood that anything that can communicate data with a base station can be considered a terminal device.

[0140] In the embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device, or a device that can support the terminal device to implement the function, such as a chip system, which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the terminal is a terminal device as an example for description.

[0141] It should be understood that network devices and terminal devices can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of network devices and terminal devices.

[0142] The roles of network devices and terminal devices can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. To terminal devices 120j that access the wireless access network via 120i, terminal device 120i is a network device; however, to network device 110a, 120i is a terminal device, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via a base station-to-base station interface protocol. In this case, 120i is also a network device relative to 110a. Therefore, both network devices and terminal devices can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with network device functionality, while 120a-120j in Figure 1 can be referred to as communication devices with terminal device functionality.

[0143] Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices can communicate through authorized spectrum, through unauthorized spectrum, or through both authorized spectrum and unauthorized spectrum (in other words, this application can be applied to both authorized spectrum and unauthorized spectrum); communication can be carried out through spectrum below 6 gigahertz (GHz), through spectrum above 6 GHz, or through spectrum below 6 GHz and spectrum above 6 GHz at the same time. The embodiments of this application do not limit the spectrum resources used for wireless communication.

[0144] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem that includes the network device functions. The control subsystem that includes the network device functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or modem) in the terminal device, or by a device that includes the terminal device functions.

[0145] In an embodiment of the present application, a network device sends a downlink signal or downlink information to a terminal device, and the downlink information is carried on a downlink channel; the terminal device sends an uplink signal or uplink information to the network device, and the uplink information is carried on an uplink channel. In order to communicate with the network device, the terminal device needs to establish a wireless connection with the cell controlled by the network device. The cell with which the terminal device has established a wireless connection is called the serving cell of the terminal device. When the terminal device communicates with the serving cell, it will also be interfered with by signals from neighboring cells.

[0146] It should be noted that the solutions in the embodiments of the present application can also be applied to other communication systems, and the corresponding names can also be replaced by the names of corresponding functions in other communication systems.

[0147] To facilitate understanding of the embodiments of the present application, the following briefly describes the terms used in the embodiments of the present application. It should be understood that these descriptions are only for facilitating understanding of the embodiments of the present application and should not constitute any limitation on the present application.

[0148] 1. Sidelink (SL)

[0149] Unlike downlink (DL) and uplink (UL) communications in cellular networks, sidelink communications can support direct communication between terminal devices, that is, user data is transmitted directly between terminal devices, avoiding the need for user data to be transferred through the network in cellular communications, thereby reducing transmission latency.

[0150] 2. Conventional terminal devices and reduced-capacity terminal devices

[0151] In sidelink communications, there are different types of terminal devices, including terminal devices with relatively strong capabilities and terminal devices with relatively weak capabilities, as shown in FIG2 .

[0152] Among them, a terminal device with relatively weak capabilities may be referred to as a reduced capability terminal device, such as a reduced capability UE (RedCap UE).

[0153] Among them, a terminal device with relatively strong capabilities may be referred to as a regular terminal device, such as a regular UE (Regular UE), a normal UE (normal UE), a non-RedCap UE (non-RedCap UE), etc. In the embodiment of the present application, a Regular UE is taken as an example for description.

[0154] As a possible example, in the Industrial Internet of Things (IIoT) applications, programmable logic controllers (PLCs) and other devices are considered to be highly capable end devices and are denoted as Regular UEs. Sensors / actuators (S / A) and other devices that require low cost and low power consumption are considered to be less capable end devices and are denoted as RedCap UEs.

[0155] As another possible example, mobile phones and other terminal devices with strong capabilities can be recorded as Regular UE, while wearable devices such as watches and headphones are sensitive to power consumption and cost and are terminal devices that require low cost / low power consumption, and can be recorded as RedCap UE.

[0156] In this application, the capabilities of a terminal device may also be described as UE capabilities. The capabilities of a terminal device may include, but are not limited to, one or more of the following: the bandwidth capability of the terminal device, the modulation capability of the terminal device, or the number of antennas supported by the terminal device.

[0157] The bandwidth capability of the terminal device can be understood as the bandwidth supported by the terminal device, that is, the maximum bandwidth supported by the terminal device. For example, if the bandwidth supported by the terminal device is 100 MHz, it means that the terminal device can support a maximum bandwidth of 100 MHz.

[0158] It should be noted that in the embodiments of the present application, the following descriptions have the same meaning and can be used interchangeably: the bandwidth of the terminal device is X, the bandwidth supported by the terminal device is X, the maximum bandwidth of the terminal device is X, the maximum bandwidth supported by the terminal device is X, the maximum bandwidth supported by the terminal device is X, and the operating bandwidth of the terminal device is X. Where X represents the bandwidth size, such as 100 MHz, 20 MHz, etc.

[0159] The modulation capability of the terminal device can be understood as the modulation methods supported by the terminal device. Common modulation methods may include, for example, quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM), 64QAM, 256QAM, and 1024QAM.

[0160] The number of antennas supported by a terminal device can be understood as the maximum number of antennas used by the terminal device during transmission and / or reception of information. For example, if the number of antennas supported by a terminal device is 8, it means that the maximum number of antennas used by the terminal device during transmission and / or reception of information is 8.

[0161] In the embodiment of the present application, the capabilities of the conventional terminal device and the reduced-capability terminal device are different, specifically:

[0162] In terms of bandwidth capability, the bandwidth supported by a conventional terminal device is greater than the bandwidth supported by a reduced-capability terminal device. For example, a conventional terminal device can support a maximum bandwidth of 100 MHz, while a reduced-capability terminal device can support a maximum bandwidth of 20 MHz or 5 MHz.

[0163] In terms of modulation capability, the maximum modulation order supported by a conventional terminal device is greater than the maximum modulation order supported by a reduced-capability terminal device. For example, a conventional terminal device can support up to 256QAM, while a reduced-capability terminal device can support up to 64QAM.

[0164] In terms of the number of antennas, the maximum number of antennas supported by a conventional terminal device is greater than the maximum number of antennas supported by a reduced-capability terminal device.

[0165] In the embodiments of the present application, different types of terminal devices supporting different bandwidths are taken as an example for introduction.

[0166] 3. Resource pool (RP)

[0167] SL communication is based on a resource pool. A resource pool is a block of time-frequency resources (or a set of time-frequency resources) dedicated to SL communication. The frequency domain resources contained in a resource pool can be continuous or discontinuous. The time domain resources contained in a resource pool can be continuous or discontinuous. Terminal devices receive on the receiving resource pool and transmit on the transmitting resource pool. If resource pools have the same resource pool index, the time-frequency resources of the resource pools can be considered to be completely overlapping.

[0168] In addition, the resource pool may also be referred to as one or more RB sets, one or more channels, one or more operating channels, or one or more nominal channel bandwidths.

[0169] In the embodiment of the present application, the resource pool may include a regular resource pool (Regular RP) and a reduced capacity resource pool (RedCap RP).

[0170] The bandwidth of the conventional resource pool is relatively large, for example, the bandwidth of the conventional resource pool is less than or equal to the bandwidth supported by the conventional terminal device, and may be greater than the bandwidth supported by the reduced-capability terminal device. The conventional resource pool may be used for communication with the conventional terminal device, for example, the conventional resource pool is predefined or included in (pre-) configuration information of the conventional terminal device.

[0171] The bandwidth of the reduced capability resource pool is smaller, for example, the bandwidth of the reduced capability resource pool is less than or equal to the bandwidth supported by the reduced capability terminal device. The reduced capability resource pool can be used for communication with the reduced capability terminal device, for example, the reduced capability resource pool is predefined or included in the (pre) configuration information of the reduced capability terminal device.

[0172] It should be understood that in the embodiments of the present application, the conventional resource pool and the reduced capacity resource pool are only used to distinguish functions and may also have other names, which are not limited to this.

[0173] In the embodiment of the present application, the structure of the resource pool includes a structure based on consecutive resource blocks (RBs) and a structure based on interlaced RBs.

[0174] In a resource pool based on a contiguous RB structure, the resource pool includes one or more subchannels, each of which includes one or more contiguous physical resource blocks (PRBs). As shown in Figure 3a, a resource pool based on a contiguous RB structure includes M subchannels, each of which includes 5 PRBs. M is a positive integer greater than or equal to 1.

[0175] In a resource pool based on a staggered RB structure, the resource pool includes one or more RB sets, each of which includes one or more subchannels, each of which includes one or more interlaces, and each interlace includes multiple non-contiguous PRBs. As shown in Figure 3b, the resource pool based on a staggered RB structure includes M RB sets, each of which includes interlaces 0 to 4. M is a positive integer greater than or equal to 1.

[0176] 4. Side control information

[0177] In the embodiment of the present application, the side control information includes sidelink control information (SCI)

[0178] In the SL communication system, a terminal device transmits data via a physical sidelink shared channel (PSSCH) and carries control information for decoding the data in the PSSCH in the SCI.

[0179] In the embodiment of the present application, the SCI may be sent via a physical sidelink control channel (PSCCH). Alternatively, the SCI may be divided into a first-order SCI and a second-order SCI.

[0180] The first-order SCI is denoted as SCI1 and is transmitted via the PSCCH. SCI1 includes the following fields: priority, frequency resource allocation indication (or frequency resource indicator value (FRIV)), time resource allocation indication (or time resource indicator value (TRIV)), and resource reservation period.

[0181] The second-order SCI is denoted as SCI2, which is sent via the PSSCH and includes the following fields: a source identifier (ID) field, a destination ID field, and the like.

[0182] In the embodiment of the present application, the SCI is divided into SCI1 and SCI2 for description, and the frequency resource allocation indication field is mainly introduced by taking FRIV as an example.

[0183] The number of bits and value of the FRIV field are related to the resource pool bandwidth. Specifically:

[0184] In a resource pool based on a continuous RB structure, the FRIV field indicates the starting subchannel index and number of subchannels for the reserved resources in one or more time slots. The number of bits and value of the FRIV field are determined according to the following rules:

[0185] 1) When the resource pool (pre)configuration reserves a maximum of 2 resources, The number of bits in this field is

[0186] 2) When the resource pool is (pre)configured to reserve up to 3 resources, The number of bits in this field is

[0187] Among them, L subCH Indicates the number of consecutive sub-channels for each reserved resource, Indicates the starting subchannel index of the second reserved resource, Indicates the starting subchannel index of the third reserved resource, Indicates the number of sub-channels included in the resource pool.

[0188] In a resource pool based on an interleaved RB structure, FRIV indicates the starting RB set index and the number of RB sets for reserving resources on one or more time slots. For specific indication methods, refer to the above sub-channel indication method. Replaced with the number of RB sets included in the resource pool.

[0189] It can be seen that no matter what structure the resource pool has, the number of bits of FRIV in SCI1 is related to the bandwidth size of the resource pool.

[0190] In some embodiments, when the resource pool bandwidth size configured for the reduced capability terminal device (such as RedCap UE) is different from the resource pool bandwidth size configured for the conventional terminal device (such as Regular UE), but there is overlap, if the reduced capability terminal device (such as RedCap UE) and the conventional terminal device (such as Regular UE) respectively determine the number of bits of the FRIV field according to the bandwidth size of their respective resource pools, then the PSCCH formats determined by the reduced capability terminal device (such as RedCap UE) and the conventional terminal device (such as Regular UE) are different (or, it can also be described as the SCI1 size determined by the reduced capability terminal device and the conventional terminal device is different).

[0191] As shown in Figure 4, the reduced-capability terminal device determines that the size of the resource pool bandwidth configured for it is N1 subchannels (or N2 subchannels), and the reduced-capability terminal device determines the number of bits in the FRIV field based on the size of its own resource pool bandwidth. The conventional terminal device determines that the size of the resource pool bandwidth configured for it is M subchannels, and the conventional terminal device determines the number of bits in the FRIV field based on the size of its own resource pool bandwidth. The number of bits in the FRIV field determined by the reduced-capability terminal device is different from the number of bits in the FRIV field determined by the conventional terminal device. For example, the number of bits in the FRIV field determined by the reduced-capability terminal device is smaller than the number of bits in the FRIV field determined by the conventional terminal device.

[0192] As a result, when SCI is transmitted between different types of terminal devices, the terminal device may be unable to correctly decode the other party's PSCCH or may need to blindly detect different PSCCH formats.

[0193] In other embodiments, the reduced-capability terminal device (pre-)configures virtual resource pool information. The virtual resource pool is the resource pool configured for a regular terminal device (e.g., a Regular UE). For example, the virtual resource pool information includes the number of RB sets in the virtual resource pool, the starting RB set index of the resource pool actually used by the reduced-capability terminal device (e.g., a RedCap UE) in the virtual resource pool, and the like, as shown in FIG5 . The reduced-capability terminal device (e.g., a RedCap UE) determines the number of bits and value of the FRIV field based on the virtual resource pool information.

[0194] It should be noted that in the embodiments of the present application, (pre) configuration can be understood as configuration or pre-configuration. Among them, configuration refers to configuration by a network device, such as a network device configuring resource pool information. Pre-configuration refers to pre-definition by the communication system (such as pre-definition of resource pool information by the communication system), or pre-definition by the communication protocol (such as pre-definition of resource pool information by the communication protocol), or pre-configuration of the terminal device when it leaves the factory (such as pre-configuration of resource pool information when the terminal device leaves the factory).

[0195] That is, the reduced capability terminal device (such as RedCap UE) always determines the number of FRIV bits according to (pre-) configuration information. This method has poor flexibility, for example:

[0196] On the one hand, in some time ranges or area ranges, even if there are no regular terminal devices (such as Regular UEs), reduced-capability terminal devices (such as RedCap UEs) still determine the number of FRIV bits according to the virtual resource pool bandwidth size, resulting in unnecessary bit overhead.

[0197] On the other hand, when a regular terminal device (such as a Regular UE) has the Uu protocol stack but a reduced-capability terminal device (such as a RedCap UE) does not, the reduced-capability terminal device (such as a RedCap UE) cannot receive reconfiguration information from the network device (such as a base station). In this case, the network device (such as a base station) cannot reconfigure the resource pool bandwidth size of the regular terminal device (such as a Regular UE), resulting in poor flexibility.

[0198] In summary, in an SL communication system, if two terminal devices are (pre-)configured with different resource pool bandwidths, the SCI sizes determined by the two terminal devices will be different. If the two resource pools with different bandwidths overlap, and the two terminal devices send and / or receive SCI in the overlapping portion of the resource pools, the terminal devices will be unable to decode each other's SCI or blindly detect SCI of different formats, affecting communication performance.

[0199] In view of this, an embodiment of the present application provides a communication method, which can be applied to the communication system shown in Figure 1. The communication method provided in the embodiment of the present application is applied to a first terminal device, and the first terminal device determines a first resource set, and the bandwidth of the first resource set is less than or equal to the bandwidth supported by the first terminal device. The first terminal device receives first information from a second terminal device, and the first information includes frequency domain information of a second resource set. The bandwidth of the second resource set is greater than the bandwidth supported by the first terminal device, and the second resource set partially overlaps or fully overlaps with the first resource set. The first terminal device sends and / or receives first side control information within the first resource set, and the first side control information includes first frequency resource indication information, and the first frequency resource indication information indicates the frequency domain position of the first resource. The first resource is used to send side information, and the number of bits of the first frequency resource indication information is determined based on the frequency domain information of the second resource set.

[0200] That is, the first terminal device can dynamically obtain the frequency domain information of the second resource set, and then determine the number of bits of the first frequency resource indication information based on the dynamically obtained frequency domain information of the second resource set, and determine the size of the first side control information.

[0201] In this way, when the first terminal device sends the first side control information, even if the first terminal device and the terminal device receiving the first side control information operate in resource sets with different bandwidth sizes, the size of the side control information determined by the above two terminal devices (i.e., the first terminal device and the terminal device receiving the first side control information) can be the same, thereby enabling the first side control information to be successfully received and decoded.

[0202] When the first terminal device receives the first side control information, even if the first terminal device and the terminal device that sends the first side control information operate in resource sets with different bandwidth sizes, the size of the side control information determined by the above two terminal devices (i.e., the first terminal device and the terminal device that sends the first side control information) can be the same, thereby enabling the first side control information to be successfully received and decoded by the first terminal device, and there is no need to blindly detect side control information of different formats.

[0203] It should be understood that a resource set refers to a set of one or more time / frequency resources. For example, a resource set includes one or more RPs. Alternatively, a resource set includes one or more RB sets. Alternatively, a resource set includes one or more bandwidth parts (BWPs). Alternatively, a resource set includes one or more partial carriers. Alternatively, a resource set includes one or more channels. In the embodiments of the present application, a resource set is described as an RP.

[0204] It should be understood that the terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, chip, or chip system, or a logic module or software that can implement all or part of the terminal device functions. In the embodiments of the present application, the terminal device is used as an example for introduction.

[0205] Similarly, a network device can be a network device, or a component used in a network device, such as a processor, a chip, or a chip system, or a logic module or software that can implement all or part of the network device functions. In the embodiments of the present application, a network device is used as an example for introduction.

[0206] It should be understood that the message names between the devices or the names of the parameters in the messages in the following embodiments of the present application are only examples, and other names may be used in specific implementations. The embodiments of the present application do not specifically limit this.

[0207] The communication method proposed in the embodiment of the present application is described in detail below with reference to Figures 6 to 11. The communication method 600 proposed in the embodiment of the present application includes the following operations:

[0208] S601: A first terminal device determines a first resource set.

[0209] For example, the first terminal device is introduced as follows:

[0210] The first terminal device may be a reduced-capability terminal device, i.e., a terminal device with relatively low capabilities in an SL communication system, such as a RedCap UE. For details, see the glossary section and are omitted. The first terminal device may be a terminal device, or a component used in a terminal device, such as a processor, chip, or chip system, or a logic module or software that implements all or part of the terminal device's functions.

[0211] For example, the first resource set is introduced as follows:

[0212] The first resource set may be a resource set configured by the first terminal device (which may also be described as the first terminal device being (pre-)configured with the first resource set). For example, the first resource set may be one or more RPs configured by a RedCap UE. Taking Figure 7 or Figure 8 as an example, the first resource set may be RedCap RP1 or RedCap RP2.

[0213] It is easy to understand that in an embodiment of the present application, the configuration information of the first resource set is predefined or preconfigured in the configuration information of the first terminal device, or is configured by the network device for the first terminal device. For example, the configuration information of the first resource set may be included in the RRC configuration parameters. Among them, the configuration information of the first resource set is used to configure the first resource set, and the configuration information of the first resource set may include time domain information and / or frequency domain information. The frequency domain information of the first resource set may include at least one of the following: the frequency domain starting position of the first resource set, the frequency domain ending position of the first resource set, the bandwidth size of the first resource set, and the number of frequency domain units of the first resource set.

[0214] The bandwidth of the first resource set is less than or equal to the bandwidth supported by the first terminal device. For example, the bandwidth of the first resource set is 5 MHz, and the bandwidth supported by the first terminal device is 20 MHz.

[0215] S602: The second terminal device sends first information to the first terminal device. Correspondingly, the first terminal device receives the first information from the second terminal device.

[0216] For example, the second terminal device is introduced as follows:

[0217] For example, the second terminal device may be a reduced-capability terminal device, that is, a terminal device with relatively weak capabilities in the SL communication system, such as a RedCap UE. Please refer to the introduction in the glossary section and will not be repeated here.

[0218] For another example, the second terminal device may be a regular terminal device, that is, a terminal device with relatively strong capabilities in the SL communication system, such as a Regular UE. Please refer to the introduction in the glossary section and will not be repeated here.

[0219] In an embodiment of the present application, the second terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, chip, or chip system, etc., or a logic module or software that can realize all or part of the terminal device functions.

[0220] The first information includes frequency domain information of the second resource set. Exemplarily, the first information includes at least one of the following: the bandwidth size of the second resource set, or the number of frequency domain units included in the second resource set, or the frequency domain starting position of the second resource set, or the frequency domain ending position of the second resource set. Specifically:

[0221] For example, the first information includes the bandwidth size of the second resource set. For example, when the bandwidth size of the second resource set is 100 MHz, the first information includes indication information that the bandwidth size is 100 MHz.

[0222] For another example, the first information includes the number of frequency domain units of the second resource set. For example, taking the frequency domain unit as a subchannel as an example, when the second resource set includes 20 subchannels, the first information includes indication information that the number of subchannels is 20. Or, taking the frequency domain unit as an RB set as an example, when the second resource set includes 20 RB sets, the first information includes indication information that the number of RB sets is 20. For example, taking the frequency domain unit as an RB as an example, when the second resource set includes 20 RBs, the first information includes indication information that the number of RBs is 20. Or, taking the frequency domain unit as a PRB as an example, when the second resource set includes 20 PRBs, the first information includes indication information that the number of PRBs is 20.

[0223] For another example, the first information includes the frequency domain starting position and frequency domain ending position of the second resource set. For example, the second resource set includes subchannels identified by subchannel indices 0-19. In this case, the first information includes indication information of subchannel index 1 and indication information of subchannel index 19. Alternatively, the frequency domain starting position of the second resource set is frequency f1, and the frequency domain ending position of the second resource set is frequency f2. In this case, the first information includes indication information of frequency f1 and indication information of frequency f2, and the bandwidth size of the second resource set is f2-f1. Alternatively, the frequency domain starting position of the second resource set is RB x1 (or called the x1th RB or the RB with RB index x1), and the frequency domain ending position of the second resource set is frequency RB x2 (or called the x2th RB or the RB with RB index x2). In this case, the first information includes indication information of RB x1 and indication information of RB x2, and the number of RBs included in the second resource set is x2-x1+1.

[0224] It is easy to understand that in the embodiment of the present application, when the first information includes the bandwidth size of the second resource set, the first information may also include at least one of the frequency domain starting position and the frequency domain ending position of the second resource set. Similarly, when the first information includes the number of frequency domain units of the second resource set, the first information may also include at least one of the frequency domain starting position and the frequency domain ending position of the second resource set.

[0225] For example, the second resource set is introduced as follows:

[0226] The second resource set may be a resource set configured by a regular terminal device (which may also be described as the regular terminal device being (pre-)configured with the second resource set). For example, the second resource set is one or more RPs configured by a Regular UE. Taking Figure 7 or Figure 8 as an example, the second resource set may be a Regular RP.

[0227] It is easy to understand that in the embodiment of the present application, the configuration information of the second resource set is predefined or preconfigured in the configuration information of the conventional terminal device, or is configured for the conventional terminal device by the network device. The configuration information of the second resource set is used to configure the second resource set, and the configuration information of the second resource set may include time domain information and / or frequency domain information.

[0228] It should be noted that the relationship between the second resource set and the second terminal device is described as follows:

[0229] Case 1: When the second terminal device is a regular terminal device, the second resource set may be a resource set configured by the second terminal device.

[0230] Case 2: When the second terminal device is a reduced-capability terminal device, the second terminal device further performs the following operations before executing S602:

[0231] The third terminal device sends the first information to the second terminal device. Correspondingly, the second terminal device receives the first information from the third terminal device.

[0232] The third terminal device is a conventional terminal device, i.e., a relatively capable terminal device in the SL communication system, such as a Regular UE. In the embodiments of the present application, the third terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, chip, or chip system, or a logic module or software that implements all or part of the terminal device's functions.

[0233] In scenario 2, the first information is carried in the synchronization signal. This means that the second terminal device receives the synchronization signal from the third terminal device, synchronizes with the third terminal device, and obtains the first information from the synchronization signal sent by the third terminal device. In scenario 2, the second terminal device synchronizes directly with a regular terminal device, and the second terminal device obtains the first information from the regular terminal device.

[0234] Case 3: When the second terminal device is a reduced-capability terminal device, the second terminal device further performs the following operations before executing S602:

[0235] The fourth terminal device sends the first information to the third terminal device. In response, the third terminal device receives the first information from the fourth terminal device. The third terminal device sends the first information to the second terminal device. In response, the second terminal device receives the first information from the third terminal device.

[0236] The fourth terminal device is a conventional terminal device, i.e., a relatively capable terminal device in the SL communication system, such as a Regular UE. In the embodiments of the present application, the fourth terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, chip, or chip system, or a logic module or software that implements all or part of the terminal device's functions.

[0237] The third terminal device is a reduced-capability terminal device, ie, a terminal device with relatively weak capabilities in the SL communication system, such as a RedCap UE.

[0238] In scenario 3, the first information is carried in the synchronization signal. This can be understood as follows: the third terminal device receives a synchronization signal from a fourth terminal device, synchronizes with the fourth terminal device, and obtains the first information from the synchronization signal sent by the fourth terminal device. The third terminal device sends a synchronization signal that carries the first information. The second terminal device receives a synchronization signal from the third terminal device, synchronizes with the third terminal device, and obtains the first information from the synchronization signal sent by the third terminal device. In scenario 3, the second terminal device is indirectly synchronized with the regular terminal device and obtains the first information from the reduced-capability terminal device.

[0239] As can be seen from Case 2 and Case 3, when the second terminal device is a reduced-capability terminal device, the second terminal device may not be configured with the second resource set. The second terminal device obtains the first information from another terminal device and forwards it to the first terminal device.

[0240] Next, the implementation process of S602 is introduced with reference to two examples (Example 1 and Example 2 below):

[0241] Example 1, as shown in FIG10 , S602 includes S6021:

[0242] S6021: The second terminal device sends first information to the first terminal device in the third resource set. Correspondingly, the first terminal device receives the first information from the second terminal device in the third resource set.

[0243] Exemplarily, in S6021, the second terminal device is a regular terminal device.

[0244] For example, the third resource set is introduced as follows:

[0245] The third resource set may be a resource set configured by the first terminal device (which may also be described as the first terminal device being (pre-)configured with the third resource set). For example, the third resource set may be one or more RPs configured by the RedCap UE. Taking Figure 7 as an example, the third resource set may be an initial resource pool (initial RP).

[0246] It is easy to understand that in the embodiment of the present application, the configuration information of the third resource set is predefined or preconfigured in the configuration information of the first terminal device, or is configured for the first terminal device by the network device.

[0247] Similarly, the third resource set may also be a resource set configured by the second terminal device (which may also be described as the second terminal device being (pre-)configured with a third resource set). For example, the third resource set is one or more RPs configured by a Regular UE. Taking Figure 7 as an example, the third resource set may be an initial resource pool (initial RP).

[0248] It is easy to understand that in the embodiment of the present application, the configuration information of the third resource set is predefined or preconfigured in the configuration information of the second terminal device, or is configured for the second terminal device by the network device.

[0249] In an embodiment of the present application, the configuration information of the third resource set is used to configure the third resource set. The configuration information of the third resource set may include time domain information and / or frequency domain information. The frequency domain information of the third resource set may include at least one of the following: a frequency domain starting position of the third resource set, a frequency domain ending position of the third resource set, a bandwidth size of the third resource set, and a number of frequency domain units of the third resource set.

[0250] In the embodiment of the present application, the relationship between the third resource set and the BWP is described as follows:

[0251] The first terminal device is (pre-)configured with a first BWP, the bandwidth of which is less than or equal to the bandwidth supported by the first terminal device. The second terminal device is (pre-)configured with a second BWP, the bandwidth of which is less than or equal to the bandwidth supported by the second terminal device. The third resource set is a resource pool, and the third resource set is located within the first BWP and within the second BWP (or, in other words, the third resource set is (pre-)configured within the first BWP, and the third resource set is (pre-)configured within the second BWP). The first terminal device and the second terminal device can communicate (e.g., exchange first information) within the third resource set.

[0252] In other words, the first type of terminal device is (pre) configured with a first BWP, and the bandwidth of the first BWP is less than or equal to the bandwidth supported by the first type of terminal device. The second type of terminal device is (pre) configured with a second BWP, and the bandwidth of the second BWP is less than or equal to the bandwidth supported by the second type of terminal device. The third resource set is a resource pool, and the third resource set is located within the first BWP and within the second BWP (or, the third resource set is (pre) configured within the first BWP, and the third resource set is (pre) configured within the second BWP), then the first type of terminal device and the second type of terminal device can communicate within the third resource set. Among them, the bandwidth supported by the first type of terminal device is less than the bandwidth supported by the second type of terminal device. Exemplarily, the first terminal device belongs to the first type of terminal device, and the second terminal device belongs to the second type of terminal device, then the first terminal device and the second terminal device can communicate (for example, exchange first information) within the third resource set. For example, the first BWP includes RB set0, a total of 1 RB set (that is, the bandwidth of the first BWP is 20 MHz), the second BWP includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (that is, the bandwidth of the second BWP is 100 MHz), the third resource set is (pre-)configured in the first BWP, and the third resource set is (pre-)configured in the second BWP, for example, the third resource set includes RB set0, a total of 1 RB set.

[0253] It should be noted that the relationship between the first BWP and the first resource set is as follows: all resources of the first resource set may be located within the first BWP; or all resources of the first resource set may be located outside the first BWP, such as the first resource set being located in a BWP other than the first BWP that the first terminal device is (pre)configured in. Similarly, the relationship between the second BWP and the second resource set is as follows:

[0254] All resources of the second resource set may be located within the second BWP; or, all resources of the second resource set may be located outside the second BWP, such as the second resource set is located in a BWP other than the second BWP for which the second terminal device is (pre)configured.

[0255] The bandwidth of the third resource set is less than or equal to the bandwidth supported by the first terminal device. For example, the bandwidth of the third resource set is 5 MHz, and the bandwidth supported by the first terminal device is 20 MHz.

[0256] The third resource set does not overlap with the first resource set at all. For example, taking Figure 7 as an example, the first resource set is RedCap RP1 (or RedCap RP2), the third resource set is initial RP, and there is no overlapping part between the first resource set and the third resource set. For example, the first BWP includes RB set0 and RB set1, a total of 2 RB sets (that is, the bandwidth of the first BWP is 40MHz), and the second BWP includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (that is, the bandwidth of the second BWP is 100MHz); the third resource set is (pre) configured in the first BWP, and the third resource set is (pre) configured in the second BWP, for example, the third resource set includes RB set0, a total of 1 RB set; the first resource set is (pre) configured in the first BWP, for example, the first resource set includes RB set1, a total of 1 RB set.

[0257] The third resource set overlaps with the second resource set. For example, the third resource set is included in the second resource set, or the third resource set and the second resource set overlap. For example, in Figure 7, the second resource set is a Regular RP, and the third resource set is an Initial RP, which is included in the Regular RP. Alternatively, the third resource set and the second resource set do not overlap at all. For example, the first BWP includes RB set0 and RB set1, a total of 2 RB sets (that is, the bandwidth of the first BWP is 40MHz), and the second BWP includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (that is, the bandwidth of the second BWP is 100MHz); the third resource set is (pre-)configured in the first BWP, and the third resource set is (pre-)configured in the second BWP, for example, the third resource set includes RB set0, a total of 1 RB set; the second resource set is (pre-)configured in the second BWP, for example, the second resource set includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (that is, the third resource set overlaps with the second resource set), or the second resource set includes RB set1, RB set2, RB set3, and RB set4, a total of 4 RB sets (that is, the third resource set and the second resource set do not overlap at all).

[0258] Exemplarily, the first information is carried in a discovery message. For example, the discovery message may be an announcement message, a solicitation message, or a response message in a device discovery process.

[0259] Exemplarily, the first information is carried in an RRC message. For example, the RRC message may be a message in a unicast connection establishment process, and the first information may be carried in capability information of the RRC message.

[0260] Optionally, in Example 1, the first information also includes a second frequency domain offset.

[0261] Exemplarily, the second frequency domain offset is introduced as follows:

[0262] The second frequency domain offset is a frequency domain offset between the third resource set and the second resource set (which may also be described as a frequency domain offset of the third resource set relative to the second resource set, or a frequency domain offset of the second resource set relative to the third resource set), and may specifically include one of the following:

[0263] In case 1, the second frequency domain offset is the frequency domain offset between the frequency domain starting position of the third resource set and the frequency domain starting position of the second resource set (which can also be described as the frequency domain offset of the frequency domain starting position of the third resource set relative to the frequency domain starting position of the second resource set, or the frequency domain offset of the frequency domain starting position of the second resource set relative to the frequency domain starting position of the third resource set). Taking Figure 7 as an example, the third resource set is the initial RP and the second resource set is the regular RP. The second frequency domain offset can be shown as O0.

[0264] Case 2: The second frequency domain offset is the frequency domain offset between the frequency domain starting position of the third resource set and the frequency domain ending position of the second resource set (it can also be described as the frequency domain offset of the frequency domain starting position of the third resource set relative to the frequency domain ending position of the second resource set, or the frequency domain offset of the frequency domain ending position of the second resource set relative to the frequency domain starting position of the third resource set).

[0265] Case 3: The second frequency domain offset is the frequency domain offset between the frequency domain end position of the third resource set and the frequency domain end position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the third resource set relative to the frequency domain end position of the second resource set, or the frequency domain offset of the frequency domain end position of the second resource set relative to the frequency domain end position of the third resource set).

[0266] Case 4: The second frequency domain offset is the frequency domain offset between the frequency domain end position of the third resource set and the frequency domain starting position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the third resource set relative to the frequency domain starting position of the second resource set, or the frequency domain offset of the frequency domain starting position of the second resource set relative to the frequency domain end position of the third resource set).

[0267] It should be understood that the second frequency domain offset can also be replaced by other descriptions, such as the frequency domain offset between reference point 3 in the third resource set and reference point 2 in the second resource set. Reference point 3 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. Similarly, reference point 2 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. This is not limited in this embodiment of the present application. In this embodiment of the present application, the second frequency domain offset is introduced using Case 1 as an example.

[0268] Optionally, the unit of the second frequency domain offset may be Hertz (Hz), a frequency domain unit, or the like.

[0269] Optionally, the second frequency domain offset may be one or more subchannels; or, the second frequency domain offset may be one or more RB sets; or, the second frequency domain offset may be one or more RBs.

[0270] In Example 1, the first terminal device dynamically obtains the first information from the third resource set.

[0271] It is easy to understand that, in the case of Example 1, as a possible implementation, as shown in FIG10 , after the first terminal device executes S602 and before executing S603a (or S603b), it also executes S604 and S605:

[0272] S604: The first terminal device sends second information to the fifth terminal device in the third resource set. Correspondingly, the fifth terminal device receives the second information from the first terminal device in the third resource set.

[0273] For example, the fifth terminal device is described as follows:

[0274] For example, the fifth terminal device may be a reduced-capability terminal device, ie, a terminal device with relatively weak capabilities in the SL communication system, such as a RedCap UE.

[0275] For another example, the fifth terminal device may be a regular terminal device, that is, a terminal device with relatively strong capabilities in the SL communication system, such as a Regular UE.

[0276] In an embodiment of the present application, the fifth terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, a chip, or a chip system, etc., or a logic module or software that can realize all or part of the terminal device functions.

[0277] It should be noted that the relationship between the fifth terminal device and other terminal devices is as follows:

[0278] The fifth terminal device is a different terminal device from the first terminal device.

[0279] The fifth terminal device and the second terminal device may be the same terminal device or different terminal devices. Similarly, the fifth terminal device and the third terminal device may be the same terminal device or different terminal devices. The fifth terminal device and the fourth terminal device may be the same terminal device or different terminal devices. The fifth terminal device may also be a terminal device other than the above-mentioned terminal devices (i.e., the first terminal device, the second terminal device, the third terminal device, and the fourth terminal device), which is not limited in this embodiment of the present application.

[0280] For example, the second information is introduced as follows:

[0281] The second information includes frequency domain information of the first resource set. For example, the second information includes at least one of the following: the frequency domain starting position of the first resource set, or the frequency domain ending position of the first resource set. Optionally, the second information also includes at least one of the following: the bandwidth size of the first resource set, or the number of frequency domain units included in the first resource set.

[0282] Exemplarily, the second information is carried in a discovery message. For example, the discovery message may be an announcement message, a solicitation message, or a response message in a device discovery process.

[0283] Exemplarily, the second information is carried in an RRC message. For example, the RRC message may be a message in a unicast connection establishment process, and the second information may be carried in capability information of the RRC message.

[0284] S605: The fifth terminal device sends first indication information to the first terminal device in the third resource set. Correspondingly, the first terminal device receives the first indication information from the fifth terminal device in the third resource set.

[0285] The first indication information instructs the first terminal device to switch to the first resource set. The first indication information is determined by the fifth terminal device according to the second information.

[0286] That is to say, for the first terminal device, when the fifth terminal device initiates resource set switching, the first terminal device receives the first indication information and switches according to the first indication information, such as switching from the third resource set to the first resource set.

[0287] In the above, Example 1 is used to introduce the case of receiving the first information through the third resource set (ie, S602 includes S6021).

[0288] The following describes, through Example 2, a case where the first information is received through a synchronization signal (ie, S602 includes S6022).

[0289] Example 2, as shown in FIG11 , S602 includes S6022:

[0290] S6022: The second terminal device sends a first synchronization signal to the first terminal device. Correspondingly, the first terminal device receives the first synchronization signal from the second terminal device.

[0291] Exemplarily, in S6022, the second terminal device may be a regular terminal device or a reduced-capability terminal device.

[0292] Exemplarily, the first synchronization signal is introduced as follows:

[0293] The first synchronization signal can be a sidelink synchronization signal, such as a sidelink synchronization signal / physical sidelink broadcast channel block (S-SSB). S-SSB is composed of a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH). For example, S-PSS and S-SSS occupy 127 subcarriers in the frequency domain, PSBCH occupies 132 subcarriers in the frequency domain (equivalent to 11 RBs, each RB contains 12 subcarriers), and one S-SSB occupies one time slot in the time domain. In addition, S-SSB can also be called S-SS / PSBCH block, and the embodiments of the present application are described using S-SSB as an example.

[0294] The first synchronization signal includes the first information. For example, the PSBCH of the first synchronization signal includes the first information.

[0295] Optionally, in Example 1, the first information also includes a fourth frequency domain offset.

[0296] Exemplarily, the fourth frequency domain offset is introduced as follows:

[0297] The fourth frequency domain offset is the frequency domain offset between the frequency domain resources where the first synchronization signal is located and the frequency domain resources of the second resource set (which can also be described as the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the second resource set, or the frequency domain offset of the frequency domain resources of the second resource set relative to the frequency domain resources where the first synchronization signal is located), and may specifically include one of the following:

[0298] In case 1, the fourth frequency domain offset is the frequency domain offset between the frequency domain starting position of the frequency domain resource where the first synchronization signal is located and the frequency domain starting position of the second resource set (it can also be described as the frequency domain offset of the frequency domain starting position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain starting position of the second resource set, or the frequency domain offset of the frequency domain starting position of the second resource set relative to the frequency domain starting position of the frequency domain resource where the first synchronization signal is located). Taking Figure 8 as an example, the first synchronization signal is S-SSB and the second resource set is Regular RP. The fourth frequency domain offset can be as shown in S1.

[0299] Case 2: The fourth frequency domain offset is the frequency domain offset between the frequency domain starting position of the frequency domain resource where the first synchronization signal is located and the frequency domain ending position of the second resource set (it can also be described as the frequency domain offset of the frequency domain starting position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain ending position of the second resource set, or the frequency domain offset of the frequency domain ending position of the second resource set relative to the frequency domain starting position of the frequency domain resource where the first synchronization signal is located).

[0300] Case 3, the fourth frequency domain offset is the frequency domain offset between the frequency domain end position of the frequency domain resource where the first synchronization signal is located and the frequency domain end position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain end position of the second resource set, or the frequency domain offset of the frequency domain end position of the second resource set relative to the frequency domain end position of the frequency domain resource where the first synchronization signal is located).

[0301] Case 4: The fourth frequency domain offset is the frequency domain offset between the frequency domain end position of the frequency domain resource where the first synchronization signal is located and the frequency domain starting position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain starting position of the second resource set, or the frequency domain starting position of the second resource set relative to the frequency domain end position of the frequency domain resource where the first synchronization signal is located).

[0302] It should be understood that the fourth frequency domain offset can also be replaced by other descriptions, such as the frequency domain offset between reference point 4 in the frequency domain resource where the first synchronization signal is located and reference point 2 in the second resource set. Reference point 4 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. Similarly, reference point 2 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. This is not limited in this embodiment of the present application. In this embodiment of the present application, the fourth frequency domain offset is introduced using Case 1 as an example.

[0303] Optionally, the unit of the fourth frequency domain offset may be Hertz (Hz), a frequency domain unit, or the like.

[0304] Optionally, the fourth frequency domain offset may be one or more subchannels; or, the fourth frequency domain offset may be one or more RB sets; or, the fourth frequency domain offset may be one or more RBs.

[0305] In Example 2, the first terminal device dynamically obtains the first information through a synchronization signal.

[0306] It is easy to understand that in the case of Example 2, as a possible implementation, as shown in FIG11 , before the first terminal device executes S602, it also executes S606:

[0307] S606: The first terminal device determines a first synchronization resource and a second synchronization resource.

[0308] The first synchronization resource is used to send and / or receive a first type of synchronization signal, which is a synchronization signal carrying first information. The second synchronization resource is used to send and / or receive a second type of synchronization signal, which is a synchronization signal not carrying first information.

[0309] Exemplarily, within one S-SSB cycle, multiple groups of S-SSB candidate resources are included. The first synchronization resource and the second synchronization resource may be candidate resources of different groups in the multiple groups of S-SSB candidate resources.

[0310] For example, taking frequency division as an example, referring to Figure 9, within an S-SSB cycle, the first group of S-SSB candidate resources and the second group of S-SSB candidate resources belong to the first synchronization resource, as indicated by the thick dashed ellipse. The third group of S-SSB candidate resources and the fourth group of S-SSB candidate resources belong to the second synchronization resource, as indicated by the thin dashed ellipse.

[0311] For example, taking time division as an example, within an S-SSB cycle, the first group of S-SSB candidate resources and the third group of S-SSB candidate resources belong to the first synchronization resources, and the second group of S-SSB candidate resources and the fourth group of S-SSB candidate resources belong to the second synchronization resources.

[0312] It should be pointed out that in an embodiment of the present application, all resources of the first synchronization resource may be located within the first resource set; or, all resources of the first synchronization resource may also be located outside the first resource set; or, part of the resources of the first synchronization resource may be located within the first resource set, and another part of the resources of the first synchronization resource may be located outside the first resource set. This embodiment of the present application does not limit this.

[0313] Similarly, all resources of the second synchronization resource may be located within the first resource set; or, all resources of the second synchronization resource may be located outside the first resource set; or, part of the resources of the second synchronization resource may be located within the first resource set, and another part of the resources of the second synchronization resource may be located outside the first resource set. This embodiment of the present application does not limit this.

[0314] Similarly, for the second terminal device, the second terminal device also executes S607:

[0315] S607: The second terminal device determines a first synchronization resource and a second synchronization resource.

[0316] The implementation process of S607 can be found in the introduction of S606 and will not be described in detail here.

[0317] When the first terminal device executes S606 and the second terminal device executes S607, the implementation process of S6021 includes:

[0318] The second terminal device sends a first-type synchronization signal within the first synchronization resource. Accordingly, when the first terminal device is within the coverage of the first-type synchronization signal (which can also be described as the first terminal device being within the coverage of the second terminal device), the first terminal device receives the first-type synchronization signal from the second terminal device within the first synchronization resource. The first-type synchronization signal includes the first information. In other words, the first terminal device receives the first information from the second terminal device within the first synchronization resource.

[0319] It is easy to understand that the second terminal device sends the second type of synchronization signal within the second synchronization resource. Correspondingly, when the first terminal device is within the coverage of the second type of synchronization signal (which can also be described as the first terminal device being within the coverage of the second terminal device), the first terminal device receives the second type of synchronization signal from the second terminal device within the second synchronization resource.

[0320] That is, in the SL communication system, different types of synchronization signals are transmitted through different types of synchronization resources, thereby avoiding conflicts between different types of PSBCHs and increasing the possibility of successful PSBCH decoding.

[0321] It is easy to understand that in Example 2, when there is no conventional terminal device, the synchronization source of the first terminal device is other reduced-capability terminal devices or itself as a synchronization source, and the first terminal device determines the number and value of FRIV bits based on the frequency domain information of the (pre) configured first resource set. Please refer to the relevant technology and will not repeat it here.

[0322] It should be noted that the first terminal device may execute S601 first and then execute S602; or, the first terminal device may execute S602 first and then execute S601; or, the first terminal device may execute S601 and S602 simultaneously, which is not limited in this embodiment of the present application.

[0323] For the first terminal device, after determining the first resource set and the first information, the first terminal device executes S603a and / or S603b:

[0324] S603a: The first terminal device sends first sidelink control information to the sixth terminal device within the first resource set. Correspondingly, the sixth terminal device receives the first sidelink control information from the first terminal device within the first resource set.

[0325] Exemplarily, the sixth terminal device is introduced as follows:

[0326] For example, the sixth terminal device may be a reduced-capability terminal device, ie, a terminal device with relatively weak capabilities in the SL communication system, such as a RedCap UE.

[0327] For another example, the sixth terminal device may be a regular terminal device, that is, a terminal device with relatively strong capabilities in the SL communication system, such as a Regular UE.

[0328] In an embodiment of the present application, the sixth terminal device can be a terminal device, or a component applied to the terminal device, such as a processor, a chip, or a chip system, etc., or a logic module or software that can realize all or part of the terminal device functions.

[0329] It should be noted that the relationship between the sixth terminal device and other terminal devices is as follows:

[0330] The sixth terminal device is a different terminal device from the first terminal device.

[0331] The sixth terminal device and the second terminal device may be the same terminal device or different terminal devices. Similarly, the sixth terminal device and the third terminal device may be the same terminal device or different terminal devices. The sixth terminal device and the fourth terminal device may be the same terminal device or different terminal devices. The sixth terminal device and the fifth terminal device may be the same terminal device or different terminal devices. The sixth terminal device may also be a terminal device other than the above-mentioned terminal devices (i.e., the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, and the fifth terminal device), which is not limited in this embodiment of the present application.

[0332] Exemplarily, the first sideline control information is introduced as follows:

[0333] The first sidelink control information includes first frequency resource indication information. The first frequency resource indication information indicates the frequency domain location of a first resource used to send the sidelink information. The number of bits of the first frequency resource indication information is determined based on the frequency domain information of the second resource set.

[0334] For example, the first sidelink control information may be first-order sidelink control information, which may be denoted as SCI1. The first sidelink control information is carried on the PSCCH. The first frequency resource indication information may be FRIV. The process of determining the number of bits of the FRIV field can be referred to the introduction of the above formula and will not be repeated here.

[0335] It should be understood that the first frequency resource indication information may also be in other forms besides FRIV, such as indicating the frequency domain position of the first resource through a bitmap, wherein the number of bits in the bitmap may be the number of frequency domain units included in the second resource set.

[0336] It should be noted that in the embodiments of the present application, the number of bits of frequency resource indication information (such as first frequency resource indication information, second frequency resource indication information, etc.) can be understood as the number of bits occupied by the frequency resource indication information. The following descriptions have the same meaning and can be used interchangeably: the number of bits of frequency resource indication information, the number of bits corresponding to the frequency resource indication information, the number of bits occupied by the frequency resource indication information, and the bit length of the frequency resource indication information.

[0337] It should be pointed out that in the embodiment of the present application, the number of bits of the first frequency resource indication information is determined based on the frequency domain information of the second resource set. It can be understood that the first frequency resource indication information indicates the position of the sidelink resources occupied or reserved by the first terminal device within the frequency domain range of the second resource set.

[0338] It should be noted that in this embodiment of the present application, the first resource is located within the first resource set and within the second resource set. For example, the first resource set includes subchannels identified by subchannel indices 0-9. The second resource set includes subchannels identified by subchannel indices 0-99. The first resource includes subchannels identified by subchannel indices 1-2. In this way, the first resource is located within both the first resource set and the second resource set.

[0339] For example, the implementation process of S603a is described as follows:

[0340] The first terminal device determines the number of bits of the first frequency resource indication information based on the frequency domain information of the second resource set. The first terminal device determines the number of bits of the first sideline control information based on the number of bits of the first frequency resource indication information. The first terminal device sends the first sideline control information to the sixth terminal device within the first resource set according to the number of bits of the first sideline control information.

[0341] The number of bits of the first sideline control information can be understood as the SCI size (SCI size or payload size of SCI).

[0342] S603b: The sixth terminal device sends first sidelink control information to the first terminal device within the first resource set. Correspondingly, the first terminal device receives the first sidelink control information from the sixth terminal device within the first resource set.

[0343] The sixth terminal device and the first side control information can be found in the introduction of S603a and will not be described in detail.

[0344] For example, the implementation process of S603b is described as follows:

[0345] The first terminal device determines the number of bits of the first frequency resource indication information based on the frequency domain information of the second resource set. The first terminal device determines the number of bits of the first sideline control information based on the number of bits of the first frequency resource indication information. The first terminal device receives and decodes the first sideline control information within the first resource set according to the number of bits of the first sideline control information.

[0346] It is easy to understand that when S602 includes S6021, the sidelink control information sent and / or received by the first terminal device within the third resource set is recorded as second sidelink control information. The second sidelink control information includes second frequency resource indication information. The second frequency resource indication information indicates the frequency domain location of the second resource, which is used to send the sidelink information. The number of bits of the second frequency resource indication information is determined based on the frequency domain information of the third resource set.

[0347] For example, the first terminal device determines the number of bits of the second frequency resource indication information based on the frequency domain information of the third resource set. The first terminal device determines the number of bits of the second sideline control information based on the number of bits of the second frequency resource indication information. The first terminal device transmits the second sideline control information within the third resource set according to the number of bits of the second sideline control information.

[0348] For another example, the first terminal device determines the number of bits of the second frequency resource indication information based on the frequency domain information of the third resource set. The first terminal device determines the number of bits of the second sideline control information based on the number of bits of the second frequency resource indication information. The first terminal device receives and decodes the second sideline control information in the third resource set according to the number of bits of the second sideline control information.

[0349] Similarly, when S602 includes S6021, the sidelink control information sent and / or received by the second terminal device within the third resource set is recorded as second sidelink control information. The second sidelink control information includes second frequency resource indication information. The second frequency resource indication information indicates the frequency domain location of the second resource, which is used to send the sidelink information. The number of bits of the second frequency resource indication information is determined based on the frequency domain information of the third resource set.

[0350] For example, the second terminal device determines the number of bits of the second frequency resource indication information based on the frequency domain information of the third resource set. The second terminal device determines the number of bits of the second sideline control information based on the number of bits of the second frequency resource indication information. The second terminal device transmits the second sideline control information within the third resource set according to the number of bits of the second sideline control information.

[0351] For another example, the second terminal device determines the number of bits of the second frequency resource indication information based on the frequency domain information of the third resource set. The second terminal device determines the number of bits of the second sideline control information based on the number of bits of the second frequency resource indication information. The second terminal device receives and decodes the second sideline control information in the third resource set according to the number of bits of the second sideline control information.

[0352] It should be understood that when the third resource set overlaps with the second resource set, the size of the second sidelink control information sent and / or received by the second terminal device in the overlapping portion is determined according to the bandwidth size of the overlapping portion. For example, the first BWP includes RB set0 and RB set1, a total of 2 RB sets (i.e., the bandwidth of the first BWP is 40MHz), and the second BWP includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (i.e., the bandwidth of the second BWP is 100MHz); the third resource set is (pre-)configured in the first BWP, and the third resource set is (pre-)configured in the second BWP, for example, the third resource set includes RB set0, a total of 1 RB set; the second resource set is (pre-)configured in the second BWP, for example, the second resource set includes RB set0, RB set1, RB set2, RB set3, and RB set4, a total of 5 RB sets (i.e., the third resource set overlaps with the second resource set); the size of the side control information sent and / or received by the second terminal device in RB set0 is determined according to the bandwidth size of the third resource set, and the size of the side control information sent and / or received by the second terminal device in RB set1, RB set2, RB set3, or RB set4 is determined according to the bandwidth size of the second resource set.

[0353] In some embodiments, the first terminal device can also determine the value of the first frequency resource indication information, as described in Examples 1 to 3 below:

[0354] Example 1: The first terminal device determines the value of the first frequency resource indication information according to the first frequency domain offset. In other words, the value of the first frequency resource indication information is determined according to the first frequency domain offset.

[0355] Exemplarily, the first frequency domain offset is introduced as follows:

[0356] The first frequency domain offset is a frequency domain offset between the first resource set and the second resource set (which can also be described as a frequency domain offset of the first resource set relative to the second resource set, or a frequency domain offset of the second resource set relative to the first resource set), and can specifically include one of the following:

[0357] In case 1, the first frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain starting position of the second resource set (which can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain starting position of the second resource set, or the frequency domain offset of the frequency domain starting position of the second resource set relative to the frequency domain starting position of the first resource set). Taking Figure 7 or Figure 8 as an example, the first resource set is RedCap RP1 and the second resource set is Regular RP. The first frequency domain offset can be shown as O1.

[0358] Case 2: The first frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain ending position of the second resource set (it can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain ending position of the second resource set, or the frequency domain offset of the frequency domain ending position of the second resource set relative to the frequency domain starting position of the first resource set).

[0359] Case 3: The first frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain end position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain end position of the second resource set, or the frequency domain offset of the frequency domain end position of the second resource set relative to the frequency domain end position of the first resource set).

[0360] Case 4: The first frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain starting position of the second resource set (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain starting position of the second resource set, or the frequency domain offset of the frequency domain starting position of the second resource set relative to the frequency domain end position of the first resource set).

[0361] It should be understood that the first frequency domain offset can also be replaced by other descriptions, such as the frequency domain offset between reference point 1 in the first resource set and reference point 2 in the second resource set. Reference point 1 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. Similarly, reference point 2 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. This is not limited in this embodiment of the present application. In this embodiment of the present application, the first frequency domain offset is introduced using Case 1 as an example.

[0362] Optionally, the unit of the first frequency domain offset may be Hertz (Hz), a frequency domain unit, or the like.

[0363] Optionally, the first frequency domain offset may be one or more subchannels; or, the first frequency domain offset may be one or more RB sets; or, the first frequency domain offset may be one or more RBs.

[0364] Exemplarily, a method for obtaining the first frequency domain offset is described as follows:

[0365] In mode 1, the first information further includes a first frequency domain offset.

[0366] That is, the first terminal device obtains the first frequency domain offset from the first information, thereby simplifying the computational complexity on the first terminal device side.

[0367] In mode 2, the first information includes information indicating the frequency domain starting position of the second resource set. For example, the second resource set includes subchannels identified by subchannel indices 0-19. In this case, the first information includes information indicating subchannel index 0. Alternatively, the first information includes the frequency of the second resource set frequency domain starting position, or the first information includes the RB index of the second resource set frequency domain starting position.

[0368] In mode 2, the first terminal device further performs the following operations: the first terminal device determines a first frequency domain offset based on the frequency domain starting position of the second resource set and the frequency domain starting position of the first resource set. Alternatively, the first terminal device determines the first frequency domain offset based on the frequency domain starting position of the second resource set and the frequency domain ending position of the first resource set.

[0369] That is, the first terminal device obtains the frequency domain starting position of the second resource set from the first information, obtains the frequency domain starting position and / or frequency domain ending position of the first resource set from the (pre)configuration information, and determines the first frequency domain offset based on the frequency domain starting position of the second resource set and the frequency domain starting position of the first resource set, or determines the first frequency domain offset based on the frequency domain starting position of the second resource set and the frequency domain ending position of the first resource set. In method 2, when the first information includes the frequency domain starting position of the second resource set, there is no need to additionally include frequency domain offset information to save signaling overhead.

[0370] In mode 3, the first information includes information indicating the frequency domain end position of the second resource set. For example, the second resource set includes subchannels identified by subchannel indices 0-19. In this case, the first information includes information indicating subchannel index 19. Alternatively, the first information includes the frequency of the second resource set's frequency domain end position, or the first information includes the RB index of the second resource set's frequency domain end position.

[0371] In mode 3, the first terminal device further performs the following operations: the first terminal device determines a first frequency domain offset based on the frequency domain end position of the second resource set and the frequency domain end position of the first resource set. Alternatively, the first terminal device determines the first frequency domain offset based on the frequency domain end position of the second resource set and the frequency domain start position of the first resource set.

[0372] That is, the first terminal device obtains the frequency domain end position of the second resource set from the first information, obtains the frequency domain start position and / or frequency domain end position of the first resource set from the (pre)configuration information, and determines the first frequency domain offset based on the frequency domain end position of the second resource set and the frequency domain end position of the first resource set, or determines the first frequency domain offset based on the frequency domain end position of the second resource set and the frequency domain start position of the first resource set. In method 3, when the first information includes the frequency domain end position of the second resource set, there is no need to additionally include frequency domain offset information to save signaling overhead.

[0373] Mode 4: When 602 includes S6021, the first terminal device determines the first frequency domain offset based on the second frequency domain offset. For example, the first terminal device determines the first frequency domain offset based on the second frequency domain offset and the third frequency domain offset.

[0374] The second frequency domain offset can be found in the introduction of S6021 and will not be described in detail.

[0375] Exemplarily, the third frequency domain offset is introduced as follows:

[0376] The third frequency domain offset is a frequency domain offset between the first resource set and the third resource set (which may also be described as a frequency domain offset of the first resource set relative to the third resource set, or a frequency domain offset of the third resource set relative to the first resource set), and may specifically include one of the following:

[0377] In case 1, the third frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain starting position of the third resource set (which can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain starting position of the third resource set, or the frequency domain offset of the frequency domain starting position of the third resource set relative to the frequency domain starting position of the first resource set). Taking Figure 7 as an example, the first resource set is RedCap RP1 and the third resource set is initial RP. The third frequency domain offset can be shown as F1.

[0378] In case 2, the third frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain ending position of the third resource set (it can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain ending position of the third resource set, or the frequency domain offset of the frequency domain ending position of the third resource set relative to the frequency domain starting position of the first resource set).

[0379] Case 3: The third frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain end position of the third resource set (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain end position of the third resource set, or the frequency domain offset of the frequency domain end position of the third resource set relative to the frequency domain end position of the first resource set).

[0380] Case 4: The third frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain starting position of the third resource set (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain starting position of the third resource set, or the frequency domain offset of the frequency domain starting position of the third resource set relative to the frequency domain end position of the first resource set).

[0381] It should be understood that the third frequency domain offset can also be replaced by other descriptions, such as the frequency domain offset between reference point 1 in the first resource set and reference point 3 in the third resource set. Reference point 1 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. Similarly, reference point 3 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. This is not limited in this embodiment of the present application. In this embodiment of the present application, the third frequency domain offset is introduced using Case 1 as an example.

[0382] Optionally, the unit of the third frequency domain offset may be Hertz (Hz), a frequency domain unit, or the like.

[0383] Optionally, the third frequency domain offset may be one or more subchannels; or, the third frequency domain offset may be one or more RB sets; or, the third frequency domain offset may be one or more RBs.

[0384] Exemplarily, a method for obtaining the third frequency domain offset is described as follows:

[0385] First, the first terminal device determines at least one of a frequency domain starting position and a frequency domain ending position of the first resource set, and determines at least one of a frequency domain starting position and a frequency domain ending position of the third resource set.

[0386] Exemplarily, the frequency domain starting position of the first resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain starting position of the first resource set may be determined based on the frequency domain ending position of the first resource set and the number of frequency domain units included in the first resource set. The frequency domain ending position of the first resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain ending position of the first resource set may be determined based on the frequency domain starting position of the first resource set and the number of frequency domain units included in the first resource set.

[0387] Similarly, the frequency domain starting position of the third resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain starting position of the third resource set may be determined based on the frequency domain ending position of the third resource set and the number of frequency domain units included in the third resource set. The frequency domain ending position of the third resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain ending position of the third resource set may be determined based on the frequency domain starting position of the third resource set and the number of frequency domain units included in the third resource set.

[0388] Then, the first terminal device determines a third frequency domain offset based on at least one of the frequency domain starting position and the frequency domain ending position of the first resource set and at least one of the frequency domain starting position and the frequency domain ending position of the third resource set.

[0389] Mode 5: When S602 includes S6022, the first terminal device determines the first frequency domain offset based on the fourth frequency domain offset. For example, the first terminal device determines the first frequency domain offset based on the fourth frequency domain offset and the fifth frequency domain offset.

[0390] The fourth frequency domain offset can be found in the introduction of S6022 and will not be described in detail.

[0391] Exemplarily, the fifth frequency domain offset is introduced as follows:

[0392] The fifth frequency domain offset is the frequency domain offset between the frequency domain resources of the first resource set and the frequency domain resources where the first synchronization signal is located (it can also be described as the frequency domain offset of the frequency domain resources of the first resource set relative to the frequency domain resources where the first synchronization signal is located, or the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the first resource set), which can specifically include one of the following:

[0393] In case 1, the fifth frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain starting position of the frequency domain resource where the first synchronization signal is located (it can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain starting position of the frequency domain resource where the first synchronization signal is located, or the frequency domain offset of the frequency domain starting position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain starting position of the first resource set). Taking Figure 8 as an example, the first resource set is RedCap RP1 and the first synchronization signal is S-SSB. The fifth frequency domain offset can be shown as E1.

[0394] In case 2, the fifth frequency domain offset is the frequency domain offset between the frequency domain starting position of the first resource set and the frequency domain ending position of the frequency domain resource where the first synchronization signal is located (it can also be described as the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain ending position of the frequency domain resource where the first synchronization signal is located, or the frequency domain offset of the frequency domain ending position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain starting position of the first resource set).

[0395] Case 3, the fifth frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain end position of the frequency domain resource where the first synchronization signal is located (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain end position of the frequency domain resource where the first synchronization signal is located, or the frequency domain offset of the frequency domain end position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain end position of the first resource set).

[0396] Case 4: The fifth frequency domain offset is the frequency domain offset between the frequency domain end position of the first resource set and the frequency domain starting position of the frequency domain resource where the first synchronization signal is located (it can also be described as the frequency domain offset of the frequency domain end position of the first resource set relative to the frequency domain starting position of the frequency domain resource where the first synchronization signal is located, or the frequency domain starting position of the frequency domain resource where the first synchronization signal is located relative to the frequency domain end position of the first resource set).

[0397] It should be understood that the fifth frequency domain offset can also be replaced with other descriptions, such as the frequency domain offset between reference point 1 in the first resource set and reference point 4 in the frequency domain resource where the first synchronization signal is located. Reference point 1 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. Similarly, reference point 4 can be a reference point other than the aforementioned frequency domain start position and frequency domain end position. This is not limited in this embodiment of the present application. In this embodiment of the present application, the fifth frequency domain offset is introduced using Case 1 as an example.

[0398] Optionally, the unit of the fifth frequency domain offset may be Hertz (Hz), a frequency domain unit, or the like.

[0399] Optionally, the fifth frequency domain offset may be one or more subchannels; or, the fifth frequency domain offset may be one or more RB sets; or, the fifth frequency domain offset may be one or more RBs.

[0400] Exemplarily, a method for obtaining the fifth frequency domain offset is described as follows:

[0401] First, the first terminal device determines at least one of the frequency domain starting position and the frequency domain ending position of the first resource set, and determines at least one of the frequency domain starting position and the frequency domain ending position of the frequency domain resource where the first synchronization signal is located.

[0402] Exemplarily, the frequency domain starting position of the first resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain starting position of the first resource set may be determined based on the frequency domain ending position of the first resource set and the number of frequency domain units included in the first resource set. The frequency domain ending position of the first resource set may be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain ending position of the first resource set may be determined based on the frequency domain starting position of the first resource set and the number of frequency domain units included in the first resource set.

[0403] Similarly, the frequency domain starting position of the frequency domain resource where the first synchronization signal is located can be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain starting position of the frequency domain resource where the first synchronization signal is located can be determined based on the frequency domain ending position of the frequency domain resource where the first synchronization signal is located and the number of frequency domain units included in the frequency domain resource where the first synchronization signal is located. The frequency domain ending position of the frequency domain resource where the first synchronization signal is located can be predefined or preconfigured in the first terminal device, or configured by the network device for the first terminal device, or the frequency domain ending position of the frequency domain resource where the first synchronization signal is located can be determined based on the frequency domain starting position of the frequency domain resource where the first synchronization signal is located and the number of frequency domain units included in the frequency domain resource where the first synchronization signal is located.

[0404] For example, the first synchronization signal may be S-SSB, the absolute radio-frequency channel number (ARFCN) corresponding to the frequency position of the first synchronization signal may be predefined or (pre) configured (for example, ARFCN indicates the center frequency of the 66th subcarrier of the S-SSB frequency domain resource), and the number of frequency domain units included in the frequency domain resource where the first synchronization signal is located may be predefined or (pre) configured (for example, 11 RBs). Based on the above information, the frequency domain starting position (or the frequency domain unit where the frequency domain starting position is located) and / or the frequency domain ending position (or the frequency domain unit where the frequency domain ending position is located) of the resource where the first synchronization signal is located may be determined.

[0405] Then, the first terminal device determines the fifth frequency domain offset based on at least one of the frequency domain starting position and the frequency domain ending position of the first resource set, and at least one of the frequency domain starting position and the frequency domain ending position of the frequency domain resource where the first synchronization signal is located.

[0406] In the above, Example 1 is used to introduce the process of determining the value of the first frequency resource indication information.

[0407] The following describes the process of determining the value of the first frequency resource indication information through Example 2.

[0408] Example 2: The first terminal device determines the value of the first frequency resource indication information according to the frequency domain unit index. That is, the value of the first frequency resource indication information is determined according to the frequency domain unit index.

[0409] Exemplarily, the frequency domain unit index is introduced as follows:

[0410] The frequency domain unit index is a frequency domain unit index of a frequency domain unit in the first resource set in the second resource set.

[0411] In conjunction with Figure 7 or Figure 8, taking the frequency domain unit as an example, the first resource set is RedCap RP1, which includes N1 subchannels. The second resource set is Regular RP, which includes M subchannels. The first frequency domain offset is O1 subchannels, and the first frequency domain offset refers to the frequency domain offset of the frequency domain starting position of the first resource set relative to the frequency domain starting position of the second resource set. In this case:

[0412] The first subchannel in the first resource set is the 1+01th subchannel in the second resource set. Thus, the subchannel index of the first subchannel in the first resource set in the second resource set is the index of the 1+01th subchannel in the second resource set.

[0413] The second subchannel in the first resource set is the 2+01th subchannel in the second resource set. Thus, the subchannel index of the second subchannel in the first resource set in the second resource set is the index of the 2+01th subchannel in the second resource set.

[0414] The same can be applied to other sub-channels in the first resource set, which will not be described in detail.

[0415] Exemplarily, a method for obtaining the frequency domain unit index is described as follows:

[0416] In mode 1, the first information further includes a frequency domain unit index.

[0417] That is, the first terminal device obtains the frequency domain unit index from the first information, thereby simplifying the computational complexity on the first terminal device side.

[0418] In method 2, the first terminal device determines the frequency domain unit index according to the first frequency domain offset.

[0419] The first frequency domain offset can be found in the introduction of the aforementioned Example 1 and will not be described in detail.

[0420] In the above, Example 2 is used to introduce the process of determining the value of the first frequency resource indication information.

[0421] The following describes the process of determining the value of the first frequency resource indication information through Example 3.

[0422] In Example 3, the first terminal device determines the value of the first frequency resource indication information based on the frequency domain unit index of the frequency domain unit of the first resource in the second resource set. In other words, the value of the first frequency resource indication information is determined based on the frequency domain unit index of the frequency domain unit of the first resource in the second resource set.

[0423] Exemplarily, the frequency domain unit index of the frequency domain unit of the first resource in the second resource set is introduced as follows:

[0424] Taking the frequency domain unit as a subchannel as an example, the first resource set includes 10 subchannels, the second resource set includes 100 subchannels, and the frequency domain offset between the first resource set and the second resource set is 10 subchannels.

[0425] In this case, the first subchannel in the first resource set has a subchannel index of 10 in the second resource set. The second subchannel in the first resource set has a subchannel index of 11 in the second resource set. The same applies to other subchannels in the first resource set and will not be described in detail.

[0426] In this case, the first resource includes the first subchannel and the second subchannel in the first resource set. Thus, the subchannel indexes of the two subchannels of the first resource in the second resource set are 10 and 11.

[0427] Therefore, it can be seen that the frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined based on the first frequency domain offset. Alternatively, the frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined based on the frequency domain unit index of the frequency domain unit in the first resource set in the second resource set.

[0428] It should be pointed out that in the embodiments of the present application, for the introduction of the frequency domain, such as RB, PRB, subcarrier, BWP, resource pool, etc., please refer to the introduction of the relevant technical specifications of 3GPP and will not be repeated here.

[0429] It is understood that in each of the above embodiments, the methods and / or steps implemented by the first terminal device may also be implemented by components applicable to the first terminal device (e.g., a processor, chip, chip system, circuit, logic module, or software); and the methods and / or steps implemented by the second terminal device may also be implemented by components applicable to the second terminal device (or the third terminal device, or the fourth terminal device, or the fifth terminal device, or the sixth terminal device) (e.g., a processor, chip, chip system, circuit, logic module, or software). The chip system may be composed of a chip, or may include a chip and other discrete components.

[0430] It is understandable that, in order to realize the above functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0431] The embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be pointed out that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0432] 12 shows a schematic structural diagram of a communication device 120. The communication device 120 includes a processing module 1201 and a transceiver module 1202. The communication device 120 can be used to implement the functions of the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device.

[0433] In some embodiments, the communication device 120 may further include a storage module (not shown in FIG. 12 ) for storing program instructions and data.

[0434] In some embodiments, the transceiver module 1202, which may also be referred to as a transceiver unit, is configured to implement a transmitting and / or receiving function. The transceiver module 1202 may be composed of a transceiver circuit, a transceiver, a transceiver, or a communication interface.

[0435] In some embodiments, the transceiver module 1202 may include a receiving module and a sending module, which are respectively used to execute the receiving and sending steps performed by the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device in the above method embodiments, and / or other processes for supporting the technology described herein; the processing module 1201 may be used to execute the processing steps (such as determination, etc.) performed by the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device in the above method embodiments, and / or other processes for supporting the technology described herein.

[0436] Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0437] Optionally, in this application, "the transceiver module receives / sends information" can also be understood as the processing module receiving / sending information via the transceiver module. "The processing module receives / sends information via the transceiver module" can also be understood as the processing module controlling the transceiver module to receive / send information. Alternatively, "the processing module sends information via the transceiver module" can be understood as the processing module outputs information to the transceiver module, which then sends the information; "the processing module receives information via the transceiver module" can be understood as the transceiver module receiving the information and inputting the information to the processing module.

[0438] In the present application, the communication device 120 may be presented in the form of functional modules divided in an integrated manner. The "module" here may refer to a specific application-specific integrated circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.

[0439] In some embodiments, when the communication device 120 in Figure 12 is a chip or a chip system, the function / implementation process of the transceiver module 1202 can be implemented through the input and output interface (or communication interface) of the chip or chip system, and the function / implementation process of the processing module 1201 can be implemented through the processor (or processing circuit) of the chip or chip system.

[0440] Since the communication device 120 provided in this embodiment can execute the above method, the technical effects that can be obtained can refer to the above method embodiments and will not be repeated here.

[0441] As a possible product form, the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device described in the embodiments of the present application can also be implemented using the following: one or more field programmable gate arrays (FPGAs), programmable logic devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits that can perform the various functions described throughout this application.

[0442] As another possible product form, the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device described in the embodiment of the present application can be implemented by a general bus architecture. For ease of explanation, refer to Figure 13, which is a structural diagram of a communication device 1300 provided in an embodiment of the present application. The communication device 1300 includes a processor 1301 and a transceiver 1302. The communication device 1300 can be a first terminal device, or a chip or chip system therein; or, the communication device 1300 can be a second terminal device, or a chip or module therein; or, the communication device 1300 can be a third terminal device, or a chip or module therein; or, the communication device 1300 can be a fourth terminal device, or a chip or module therein; or, the communication device 1300 can be a fifth terminal device, or a chip or module therein; or, the communication device 1300 can be a sixth terminal device, or a chip or module therein. Figure 13 only shows the main components of the communication device 1300. In addition to the processor 1301 and the transceiver 1302 , the communication device 1300 may further include a memory 1303 and an input / output device (not shown).

[0443] Optionally, processor 1301 is primarily used to process communication protocols and communication data, as well as control the entire communication device, execute software programs, and process software program data. Memory 1303 is primarily used to store software programs and data. Transceiver 1302 may include a radio frequency circuit and an antenna. The radio frequency circuit is primarily used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as a touch screen, display, and keyboard, are primarily used to receive user input and output data to the user.

[0444] Optionally, the processor 1301 , the transceiver 1302 , and the memory 1303 may be connected via a communication bus.

[0445] When the communication device is powered on, processor 1301 reads the software program stored in memory 1303, interprets and executes its instructions, and processes its data. When wireless data needs to be transmitted, processor 1301 performs baseband processing on the data to be transmitted and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits it via the antenna as electromagnetic waves. When data is sent to the communication device, the RF circuit receives the RF signal via the antenna, converts it into a baseband signal, and outputs the baseband signal to processor 1301. Processor 1301 converts the baseband signal into data and processes the data.

[0446] In another implementation, the RF circuit and antenna may be provided independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be remotely arranged independent of the communication device.

[0447] In some embodiments, in terms of hardware implementation, those skilled in the art may conceive that the communication device 120 may take the form of the communication device 1300 shown in FIG. 13 .

[0448] As an example, the functions / implementation process of the processing module 1201 in FIG12 can be implemented by the processor 1301 in the communication device 1300 shown in FIG13 calling the computer-executable instructions stored in the memory 1303. The functions / implementation process of the transceiver module 1202 in FIG12 can be implemented by the transceiver 1302 in the communication device 1300 shown in FIG13.

[0449] As another possible product form, the first terminal device, second terminal device, third terminal device, fourth terminal device, fifth terminal device, or sixth terminal device in this application may adopt the structure shown in Figure 14, or include the components shown in Figure 14. Figure 14 is a schematic diagram of the structure of a communication device 1400 provided in this application.

[0450] As shown in FIG14 , a communication device 1400 includes at least one processor 1401. Optionally, the communication device further includes a communication interface 1402.

[0451] When the program instructions are executed in the at least one processor 1401, the apparatus 1400 may implement the method provided in any of the aforementioned embodiments and any possible designs thereof. Alternatively, the processor 1401 may implement the method provided in any of the aforementioned embodiments and any possible designs thereof through logic circuits or by executing code instructions.

[0452] The communication interface 1402 may be used to receive program instructions and transmit them to the processor. Alternatively, the communication interface 1402 may be used for communication between the communication device 1400 and other communication devices, such as exchanging control signaling and / or service data. Exemplarily, the communication interface 1402 may be used to receive signals from devices other than the communication device 1400 and transmit them to the processor 1401, or to send signals from the processor 1401 to other communication devices other than the communication device 1400.

[0453] Optionally, the communication interface 1402 may be a code and / or data read / write interface circuit, or the communication interface 1402 may be a signal transmission interface circuit between a communication processor and a transceiver, or a pin of a chip.

[0454] Optionally, the communication device 1400 may further include at least one memory 1403, which may be used to store required program instructions and / or data. It should be noted that the memory 1403 may exist independently of the processor 1401 or may be integrated with the processor 1401. The memory 1403 may be located within or outside the communication device 1400, without limitation.

[0455] Optionally, the communication device 1400 may further include a power supply circuit 1404, which may be used to supply power to the processor 1401. The power supply circuit 1404 may be located in the same chip as the processor 1401, or in another chip other than the chip where the processor 1401 is located.

[0456] Optionally, the communication device 1400 may further include a bus 1405 , and various parts of the communication device 1400 may be interconnected via the bus 1405 .

[0457] In some embodiments, in terms of hardware implementation, those skilled in the art may conceive that the communication device 120 shown in FIG. 12 may take the form of the communication device 1400 shown in FIG. 14 .

[0458] As an example, the functions / implementation process of the processing module 1201 in FIG12 can be implemented by the processor 1401 in the communication device 1400 shown in FIG14 calling the computer-executable instructions stored in the memory 1403. The functions / implementation process of the transceiver module 1202 in FIG12 can be implemented by the communication interface 1402 in the communication device 1400 shown in FIG14.

[0459] It should be noted that the structure shown in FIG14 does not constitute a specific limitation on the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device. For example, in other embodiments of the present application, the first terminal device, the second terminal device, the third terminal device, the fourth terminal device, the fifth terminal device, or the sixth terminal device may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0460] Optionally, the processor in the present application may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0461] Optionally, the memory in 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 random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), or direct rambus RAM (DR RAM).

[0462] Optionally, the power supply circuit described in the embodiment of the present application includes but is not limited to at least one of the following: a power supply line, a power supply subsystem, a power management chip, a power consumption management processor, or a power consumption management control circuit.

[0463] In some embodiments, an embodiment of the present application further provides a communication device, which includes a processor for implementing the method in any of the above method embodiments.

[0464] As a possible implementation, the communication device further includes a memory. The memory is used to store necessary computer programs and data. The computer program may include instructions, and the processor may invoke the instructions in the computer program stored in the memory to instruct the communication device to execute any of the above-described method embodiments. Of course, the memory may not be located in the communication device.

[0465] As another possible implementation, the communication device also includes an interface circuit, which is a code / data read / write interface circuit, and the interface circuit is used to receive computer execution instructions (computer execution instructions are stored in a memory, may be read directly from the memory, or may pass through other devices) and transmit them to the processor.

[0466] As another possible implementation, the communication device further includes a communication interface, where the communication interface is used to communicate with a module outside the communication device.

[0467] It can be understood that the communication device can be a chip or a chip system. When the communication device is a chip system, it can be composed of chips or include chips and other discrete devices. The embodiments of the present application do not specifically limit this.

[0468] The present application also provides a computer-readable storage medium having a computer program or instruction stored thereon, which implements the functions of any of the above method embodiments when executed by a computer.

[0469] The present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0470] Those skilled in the art will appreciate that, for the sake of convenience and brevity of description, the specific working processes of the above-described systems, devices, and units may refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0471] It is understood that the systems, devices, and methods described in this application may also be implemented in other ways. For example, the device embodiments described above are merely illustrative. 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. In addition, the coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of devices or units, and may be electrical, mechanical, or other forms.

[0472] The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Components shown as units may or may not be physical units. Some or all of these units may be selected to achieve the objectives of this embodiment as needed.

[0473] 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.

[0474] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium may 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 media integrated therein. 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 drive (SSD)). In the embodiment of the present application, the computer may include the aforementioned device.

[0475] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and implement other changes to the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0476] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

Claims

1. A communication method, characterized in that: The method comprises: The first terminal device determines a first resource set, where a bandwidth of the first resource set is less than or equal to a bandwidth supported by the first terminal device; The first terminal device receives first information from a second terminal device, where the first information includes frequency domain information of a second resource set, a bandwidth of the second resource set is greater than a bandwidth supported by the first terminal device, and the second resource set partially or completely overlaps with the first resource set; The first terminal device sends and / or receives first sideline control information within the first resource set, the first sideline control information includes first frequency resource indication information, the first frequency resource indication information indicates the frequency domain position of the first resource, the first resource is used to send sideline information, and the number of bits of the first frequency resource indication information is determined based on the frequency domain information of the second resource set.

2. The method according to claim 1, characterized in that The first resource is located within the first resource set and within the second resource set.

3. The method according to claim 1 or 2, characterized in that: The first information includes at least one of the following: the bandwidth size of the second resource set, or the number of frequency domain units included in the second resource set, or the frequency domain starting position of the second resource set, or the frequency domain ending position of the second resource set.

4. The method according to any one of claims 1 to 3, characterized in that The value of the first frequency resource indication information is determined according to the frequency domain unit index of the frequency domain unit of the first resource in the second resource set.

5. The method according to any one of claims 1 to 4, characterized in that The frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined according to a first frequency domain offset, where the first frequency domain offset is a frequency domain offset of the first resource set relative to the second resource set; or, The frequency domain unit index of the frequency domain unit of the first resource in the second resource set is determined according to the frequency domain unit index of the frequency domain unit in the first resource set in the second resource set.

6. The method according to claim 5, characterized in that The first information includes the first frequency domain offset; or, The method also includes: the first terminal device determines the first frequency domain offset according to the frequency domain starting position of the second resource set and the frequency domain starting position of the first resource set, and the first information includes the frequency domain starting position of the second resource set.

7. The method according to any one of claims 1 to 6, characterized in that The first terminal device receives first information from the second terminal device, including: The first terminal device receives the first information from the second terminal device in a third resource set, and frequency domain information of the third resource set is predefined or preconfigured in configuration information of the first terminal device, or is configured for the first terminal device by a network device.

8. The method according to claim 7, characterized in that The third resource set is located within the first bandwidth BWP and within the second BWP; The frequency domain information of the first BWP is predefined or preconfigured in the configuration information of the first terminal device, or is configured by the network device for the first terminal device; The frequency domain information of the second BWP is predefined or preconfigured in the configuration information of the second terminal device, or is configured by the network device for the second terminal device.

9. The method according to claim 7 or 8, characterized in that: The method further comprises: The first terminal device sends second information to the second terminal device within the third resource set, where the second information includes frequency domain information of the first resource set; The first terminal device receives first indication information from the second terminal device in the third resource set, the first indication information instructing the first terminal device to switch to the first resource set, and the first indication information is determined according to the second information.

10. The method according to any one of claims 7 to 9, characterized in that: The first information includes a second frequency domain offset, where the second frequency domain offset is a frequency domain offset of the third resource set relative to the second resource set.

11. The method according to any one of claims 1 to 10, characterized in that The first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device; The bandwidth supported by the first type of terminal device is smaller than the bandwidth supported by the second type of terminal device.

12. The method according to any one of claims 1 to 11, characterized in that The first information is carried in a discovery message or a radio resource control RRC message.

13. The method according to any one of claims 1 to 6, characterized in that The first information is carried in a first synchronization signal.

14. The method according to claim 13, characterized in that The first synchronization signal includes a physical sidelink broadcast channel PSBCH, and the first information is carried on the PSBCH.

15. The method according to claim 13 or 14, characterized in that The method further comprises: The first terminal device determines a first synchronization resource and a second synchronization resource; The first synchronization resource is used to send and / or receive a first type of synchronization signal, and the first type of synchronization signal is a synchronization signal carrying the first information; The second synchronization resource is used to send and / or receive a second type of synchronization signal, where the second type of synchronization signal is a synchronization signal that does not carry the first information.

16. The method according to claim 15, characterized in that The first terminal device receives first information from the second terminal device, including: The first terminal device receives the first information from the second terminal device in the first synchronization resource.

17. The method according to any one of claims 13 to 16, characterized in that The first information includes a fourth frequency domain offset, where the fourth frequency domain offset is a frequency domain offset of a frequency domain resource where the first synchronization signal is located relative to a frequency domain resource of the second resource set.

18. The method according to any one of claims 13 to 17, characterized in that: The first terminal device belongs to a first type of terminal device, and the second terminal device belongs to a second type of terminal device; or, The first terminal device and the second terminal device belong to a first type of terminal device, and the first information is information acquired by the second terminal device from a third terminal device; The bandwidth supported by the first type of terminal device is smaller than the bandwidth supported by the second type of terminal device.

19. The method according to any one of claims 1 to 18, characterized in that The first sidelink control information is carried on a physical sidelink control channel PSCCH.

20. A communication method, characterized in that: The method comprises: The second terminal device sends first information to the first terminal device, where the first information includes frequency domain information of a second resource set, and a bandwidth of the second resource set is greater than a bandwidth supported by the first terminal device; The second terminal device receives first sideline control information from the first terminal device, the first sideline control information includes first frequency resource indication information, the first frequency resource indication information indicates the frequency domain position of a first resource, the first resource is used to send sideline information, the number of bits of the first frequency resource indication information is determined according to the frequency domain information of the second resource set, the first resource is located in the first resource set and in the second resource set, and the first resource set is a sideline resource set determined by the first terminal device.

21. The method according to claim 20, characterized in that The second terminal device sending first information to the first terminal device includes: The second terminal device sends the first information to the first terminal device within a third resource set, and frequency domain information of the third resource set is predefined or preconfigured in configuration information of the second terminal device, or is configured for the second terminal device by a network device.

22. The method according to claim 21, characterized in that The third resource set is located within the first bandwidth BWP and within the second BWP; The frequency domain information of the first BWP is predefined or preconfigured in the configuration information of the first terminal device, or is configured by the network device for the first terminal device; The frequency domain information of the second BWP is predefined or preconfigured in the configuration information of the second terminal device, or is configured by the network device for the second terminal device.

23. The method according to claim 21 or 22, characterized in that The first information includes at least one of the following: the bandwidth size of the second resource set, or the frequency domain included in the second resource set. The number of units, or the starting position in the frequency domain of the second resource set, or the ending position in the frequency domain of the second resource set, or the second frequency domain offset, where the second frequency domain offset is the frequency domain offset of the third resource set relative to the second resource set.

24. The method according to claim 20, characterized in that The first information is carried in a first synchronization signal.

25. The method according to claim 24, characterized in that The first information includes at least one of the following: the bandwidth size of the second resource set, or the number of frequency domain units included in the second resource set, or the frequency domain starting position of the second resource set, or the frequency domain ending position of the second resource set, or a fourth frequency domain offset, wherein the fourth frequency domain offset is the frequency domain offset of the frequency domain resources where the first synchronization signal is located relative to the frequency domain resources of the second resource set.

26. A communication device, characterized in that: include: A processor and a memory, wherein the processor and the memory are coupled, and the memory stores program instructions. When the program instructions stored in the memory are executed by the processor, the terminal device executes the method according to any one of claims 1 to 19.

27. A communication device, characterized in that: include: A processor and a memory, wherein the processor and the memory are coupled, and the memory stores program instructions. When the program instructions stored in the memory are executed by the processor, the terminal device executes the method as described in any one of claims 20-25.

28. A computer-readable storage medium storing a computer program or instruction, characterized in that: When the computer program or instruction is executed on a terminal device, the terminal device is caused to execute the method according to any one of claims 1 to 19, or the terminal device is caused to execute the method according to any one of claims 20 to 25.

29. A computer program product, characterized in that When the method is executed on a terminal device, the terminal device is enabled to execute the method according to any one of claims 1 to 19, or the terminal device is enabled to execute the method according to any one of claims 20 to 25.

30. A communication system, characterized in that: include: A first terminal device and a second terminal device, wherein the first terminal device is used to execute the method according to any one of claims 1 to 19, and the second terminal device is used to execute the method according to any one of claims 20 to 25.

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