Method and terminal device for wireless communication

Abstract

A method for wireless communication and a terminal device are provided. The method comprises the following steps: the terminal equipment determines first configuration information, wherein the first configuration information is used for configuring sidelink positioning reference signal SL PRS resources in a resource pool; in the embodiment of the invention, the terminal equipment can determine the configuration information used for configuring the SL PRS resource in the resource pool, so that the terminal equipment can determine the resource unit used when the resource exclusion is executed in the process of selecting the SL PRS resource.

Description

Method and terminal device for wireless communication Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method and terminal device for wireless communication. Background Art

[0002] Currently, in the second resource selection mode, when a terminal device performs resource exclusion, it uses single-slot resources as resource units. That is, each element in the candidate resource set obtained after resource exclusion is a single-slot resource. However, when selecting sidelink positioning reference signal (SLPRS) resources, how the terminal device determines the resource units when performing resource exclusion remains an unresolved issue.

[0003] Summary of the Invention

[0004] The present application provides a method and terminal device for wireless communication. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, including: a terminal device determining first configuration information, where the first configuration information is used to configure a sidelink positioning reference signal SL PRS resource in a resource pool.

[0006] In a second aspect, a terminal device is provided, including: a processing unit, configured to determine first configuration information, where the first configuration information is used to configure a sidelink positioning reference signal SL PRS resource in a resource pool.

[0007] In a third aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0008] In a fourth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device in the solution provided in the embodiment of the present application.

[0009] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device or a network device) to execute some or all of the steps in the methods of the above aspects.

[0010] In a sixth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0011] In the seventh aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0012] In an embodiment of the present application, the terminal device can determine the configuration information (also called "first configuration information") used to configure the SL PRS resources in the resource pool, which helps the terminal device determine the resource unit used when performing resource exclusion during the process of selecting SL PRS resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0014] FIG2 is an example diagram of a side communication scenario within network coverage.

[0015] FIG3 is an example diagram of a side communication scenario with partial network coverage.

[0016] FIG4 is an example diagram of a side communication scenario outside network coverage.

[0017] FIG5 is a diagram showing an example of a side communication scenario based on a central control node.

[0018] FIG6 is an example diagram of a sideline communication method based on broadcasting.

[0019] FIG7 is an example diagram of a unicast-based sideline communication method.

[0020] FIG8 is an example diagram of a side communication method based on multicast.

[0021] FIG9 is a schematic diagram of sidelink resource selection in the second mode.

[0022] FIG10 is a schematic diagram of resources for transmitting a DL PRS.

[0023] FIG11 is a schematic diagram of SL PRS resources according to an embodiment of the present application.

[0024] FIG12 is a schematic diagram of SL PRS resources according to another embodiment of the present application.

[0025] FIG13 is a schematic flowchart of a method for wireless communication according to an embodiment of the present application.

[0026] FIG14 is a schematic diagram of a terminal device according to an embodiment of the present application.

[0027] FIG15 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solution in this application will be described below with reference to the accompanying drawings.

[0029] Communication system architecture

[0030] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0031] FIG1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For a network device 110, the one or more terminal devices 120 may all be located within the network coverage of the network device 110, or all be located outside the network coverage of the network device 110, or some may be located within the coverage of the network device 110 and others outside the network coverage of the network device 110. This is not limited in the embodiments of the present application.

[0032] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0033] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0034] The terminal device in the embodiment of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal device, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. For example, a terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cell phone and a car can communicate with each other using sidelink signals. A cell phone and a smart home device can also communicate without relaying the communication signal through a base station. Alternatively, the terminal device can be used to act as a base station.

[0035] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned device or apparatus. A base station may also be a mobile switching center and a device that performs base station functions in device-to-device D2D, V2X, or machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by network devices.

[0036] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0037] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0038] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0039] Sideline communication under different network coverage conditions

[0040] Sidelink communication refers to a communication technology based on a sidelink. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In traditional cellular systems, communication data is received or sent between terminal devices and network devices, while sidelink communication supports direct communication and data transmission between terminal devices. Compared with traditional cellular communication, direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission latency. For example, the vehicle networking system adopts sidelink communication technology.

[0041] In side communication, according to the network coverage of the terminal device, the side communication can be divided into side communication within the network coverage, side communication with partial network coverage, and side communication outside the network coverage.

[0042] Figure 2 illustrates an example scenario for sidelink communication within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage of network device 110. Therefore, both terminal devices 120a can receive configuration signaling from network device 110 (configuration signaling in this application can also be replaced by configuration information) and determine the sidelink configuration based on the configuration signaling from network device 110. After both terminal devices 120a have configured their sidelinks, sidelink communication can proceed on the sidelink.

[0043] Figure 3 is an example diagram of a scenario of sidelink communication with partial network coverage. In the scenario shown in Figure 3, terminal device 120a performs sidelink communication with terminal device 120b. Terminal device 120a is located within the coverage range of network device 110, so terminal device 120a can receive the configuration signaling of network device 110 and determine the sidelink configuration based on the configuration signaling of network device 110. Terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of network device 110. In this case, terminal device 120b can determine the sidelink configuration based on pre-configuration information and / or information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a within the network coverage. After both terminal device 120a and terminal device 120b perform sidelink configuration, sidelink communication can be performed on the sidelink.

[0044] Figure 4 illustrates an example scenario for sidelink communication outside of network coverage. In the scenario shown in Figure 4, both terminal devices 120b are outside of network coverage. In this scenario, both terminal devices 120b can determine the sidelink configuration based on pre-configured information. After both terminal devices 120b have configured their sidelinks, sidelink communication can proceed over the sidelink.

[0045] Sideline communication based on central control node

[0046] Figure 5 is an example diagram of a sideline communication scenario based on a central control node. In this sideline communication scenario, multiple terminal devices can form a communication group, and the communication group has a central control node. The central control node can be a terminal device in the communication group (such as terminal device 1 in Figure 5), and the terminal device can also be called a cluster head (CH) terminal device. The central control node can be responsible for completing one or more of the following functions: establishing a communication group, joining and leaving group members of the communication group, coordinating resources within the communication group, allocating sideline transmission resources to other terminal devices, receiving sideline feedback information from other terminal devices, and coordinating resources with other communication groups.

[0047] Sideline communication mode

[0048] Certain standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two sideline communication modes (also called “resource selection modes”): a first mode and a second mode.

[0049] In the first mode, the resources of the terminal device (the resources mentioned in this application may also be referred to as transmission resources, such as time-frequency resources) are allocated by the network device. The terminal device can send data on the side link according to the resources allocated by the network device. The network device can allocate resources for a single transmission to the terminal device, or it can allocate resources for semi-static transmission to the terminal device. This first mode can be applied to scenarios covered by a network device, such as the scenario shown in Figure 2 above. In the scenario shown in Figure 2, the terminal device 120a is within the network coverage of the network device 110, so the network device 110 can allocate resources used in the side transmission process to the terminal device 120a.

[0050] In the second mode, the terminal device can autonomously select one or more resources from a resource pool (RP). The terminal device can then perform side transmission based on the selected resources. For example, in the scenario shown in FIG4 , the terminal device 120b is located outside the cell coverage area. Therefore, the terminal device 120b can autonomously select resources from a pre-configured resource pool for side transmission. Alternatively, in the scenario shown in FIG2 , the terminal device 120a can also autonomously select one or more resources from a resource pool configured by the network device 110 for side transmission.

[0051] For ease of understanding, the second mode is described below in conjunction with FIG9. As shown in FIG9, the terminal device triggers resource selection or reselection at time slot n, and the resource selection window starts from n+T1 and ends at n+T2. 0≤T1≤T proc,1 , when the subcarrier spacing is 15, 30, 60, 120kHz, T proc,1 For time slots 3, 5, 9, and 17. If T 2min is less than the remaining delay budget of the service, then T 2min ≤T2≤the remaining delay budget of the service, otherwise, T2 is equal to the remaining delay budget (PDB) of the data packet in time slots. 2min The value set is {1,5,10,20}*2 μ time slots, where μ = 0, 1, 2, 3 corresponds to the case where the subcarrier spacing is 15, 30, 60, 120 kHz. The terminal device determines T from the value set according to the priority of its own data to be sent. 2min Among them, [n+T1,n+T2] can be called the resource selection window.

[0052] Terminal equipment is in n-T0 to nT proc,0 For resource listening, the value of T0 is 100 or 1100 milliseconds. When the subcarrier spacing is 15, 30, 60, or 120 kHz, T proc,0are 1, 1, 2, and 4 time slots. [n - T0 to n - T proc,0 is called a resource listening window.

[0053] In some implementations, the second mode proceeds in the following two steps.

[0054] Step 1: The physical layer of the terminal device can exclude resources that are not suitable for sidelink transmission from the resource selection window according to the channel listening result.

[0055] The terminal device takes all available resources within the resource selection window that belong to the resource pool used by the terminal device as resource set A. Any resource in set A is denoted as R(x, y), where x and y respectively indicate the frequency domain position and time domain position of the resource, representing the resource composed of consecutive L_subch sub-channels starting from sub-channel x within time slot y. Denote the initial number of resources in set A as M total .

[0056] Step 1-1: If the terminal device transmits data in time slot a within the listening window and does not perform listening, the terminal device will determine whether time slot a + q * Prxlg overlaps with resource R(x, y + j * Ptxlg). If there is an overlap, resource R(x, y) is excluded from resource set A. Here, j = 0, 1, 2, 3... C - 1, and C is determined by a random value generated by the terminal device. Ptxlg represents the number of logical time slots after converting the resource reservation period Ptx of the terminal device. Prxlg is the number of logical time slots after converting Prx, where Prx is any allowable resource reservation period within the resource pool. If Prx < Tscal and n - m <= Prxlg, Otherwise Q = 1. Tscal is equal to the value of T2 after converting to milliseconds.

[0057] Step 1-2: If the terminal device listens to the first sidelink control information transmitted in the PSCCH on the vth frequency domain resource E(v, m) within time slot m in the listening window, the terminal device measures the sidelink reference signal receiving power (SL-RSRP) of this PSCCH or the SL-RSRP of the PSSCH scheduled by this PSCCH (i.e., the SL-RSRP of the corresponding PSSCH transmitted in the same time slot as this PSCCH). If the measured SL-RSRP is greater than the SL-RSRP threshold, and resource reservation between TBs is activated within the resource pool used by the terminal device, the terminal device assumes that the same first sidelink control information is received on time slot m + q * Prxlg. Here, q = 1, 2, 3... Q, if Prx < Tscal and n - m <= Prxlg, Otherwise Q=1. Tscal is equal to the value of T2 converted into milliseconds. Prxlg is the number of logical time slots converted from Prx, where Prx is the resource reservation period indicated by the resource reservation period ("resource reservation period") in the first sideline control information transmitted in the PSCCH monitored by the terminal device. The terminal device will determine whether the resources indicated by the time domain resource allocation (time resource assignment) and frequency domain resource allocation (frequency resource assignment) fields of the first sideline control information received in time slot m and these assumed Q first sideline control information received overlap with the resource R(x, y+j*Ptxlg). If they overlap, the corresponding resource R(x, y) will be excluded from the set A. The above j=0,1,2,3…C-1, C is determined by the value of a random counter generated by the terminal device. Ptxlg is the number of logical time slots converted from Ptx, and Ptx is the resource reservation period determined by the terminal device that performs resource selection.

[0058] The above RSRP threshold is determined by the priority P1 carried in the PSCCH detected by the terminal device and the priority P2 of the data to be sent by the terminal device. The configuration of the resource pool used by the terminal device includes a SL-RSRP threshold table, which contains the SL-RSRP thresholds corresponding to all priority combinations. The configuration of the resource pool can be a network device configuration or pre-configured. If the remaining resources in resource set A are insufficient after the above resources are excluded, total *X%, then raise the SL-RSRP threshold by 3dB and repeat step 1. The possible values ​​of X are {20, 35, 50}. The configuration of the resource pool used by the terminal device includes a correspondence between the priority and the possible values ​​of X. The terminal device determines the value of X based on the priority of the data to be sent and this correspondence.

[0059] The physical layer of the terminal device reports the resource set A after resource exclusion as a candidate resource set to a higher layer, for example, a media access control (MAC) layer of the terminal device.

[0060] Step 2: The MAC layer of the terminal device randomly selects a resource from the reported candidate resource set to send data. That is, the terminal device randomly selects a resource from the candidate resource set to send data.

[0061] Data transmission method of side communication

[0062] Some sidewalk communication systems (such as long-term evolution vehicle to everything (LTE-V2X)) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device around terminal device 1, for example, terminal device 2 to terminal device 6 in Figure 6.

[0063] In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and / or multicast-based data transmission (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) hopes to support autonomous driving. Autonomous driving places higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and multicast transmission.

[0064] For unicast transmission, there is typically only one receiving terminal. For example, in Figure 7, unicast transmission occurs between terminal devices 1 and 2. Terminal device 1 can be the sending terminal, and terminal device 2 can be the receiving terminal, or vice versa.

[0065] For multicast transmission, the receiving terminal can be a terminal device within a communication group, or a terminal device within a certain transmission distance. For example, in Figure 8, terminal devices 1, 2, 3, and 4 form a communication group. If terminal device 1 sends data, all other terminal devices in the group (terminal devices 2 through 4) can be receiving terminals.

[0066] Downlink-based positioning

[0067] In downlink-based positioning, the network device can provide the terminal device with downlink positioning reference signal (DL PRS) configurations for four positioning frequency layers. The parameter structure of each positioning frequency layer provides the following DL PRS configuration parameters: DL PRS subcarrier spacing; DL PRS cyclic prefix (CP) length; DL PRS frequency domain resource bandwidth; DL PRS frequency domain starting frequency position; DL PRS frequency domain reference point "Point A"; and DL PRS comb size "Comb-N."

[0068] The value of the frequency domain resource bandwidth of the DL PRS may be the number of physical resource blocks (PRBs) allocated to the DL PRS. In some cases, the minimum value of the frequency domain resource bandwidth of the DL PRS may be 24 PRBs, and the granularity may be 4 PRBs. The maximum value of the frequency domain resource bandwidth of the DL PRS may be 272 PRBs.

[0069] The frequency domain starting frequency position of the DL PRS resource is used to indicate the index of the starting PRB of the DL PRS in the frequency domain resource allocation. The PRB index is defined relative to the frequency domain reference point "Point A" of the DL PRS.

[0070] The above DL PRS configuration parameters corresponding to each positioning frequency layer can be applied to all DL PRS resources contained in the positioning frequency layer. That is to say, in a positioning frequency layer, all DL PRS from multiple different TRPs can use the same subcarrier spacing and CP length, the same comb size, be sent on the same frequency subband, and occupy the same bandwidth. Such a design can support terminal devices to simultaneously receive and measure DL PRS from multiple different TRPs on the same frequency point.

[0071] In some scenarios, the TRP layer parameters also include DL PRS configuration parameters. This may include a parameter for uniquely identifying the TRP, such as the physical cell ID of the TRP, the NR cell global identifier (NCGI) of the TRP, the absolute radio frequency channel number (ARFCN) of the TRP, etc. Typically, up to two DL PRS resource sets can be configured in each TRP layer. The configuration parameters of DL PRS in the parameters of the TRP layer for each DL PRS resource set include the DL PRS resource set identification identifier (expressed by "nr-DL-PRS-ResourceSetID"); the transmission period and time slot offset of DL PRS (expressed by "dl-PRS-Periodicity-and-ResourceSetSlotOffset"); the repetition factor of DL PRS resources (expressed by "dl-PRS-ResourceRepetitionFactor"); the time interval for repeated transmission of DL PRS resources (expressed by "dl-PRS-ResourceTimeGap"); the muting configuration of DL PRS; and the number of orthogonal frequency division multiplexing (OFDM) symbols (hereinafter referred to as "symbols") occupied by DL PRS resources (expressed by "dl-PRS-NumSymbols").

[0072] The above-mentioned DL PRS transmission period and time slot offset are used to indicate the time domain transmission behavior of all DL PRS resources in the DL PRS resource set. In some implementations, the minimum value of the configurable DL PRS transmission period is 4 milliseconds, and the maximum value of the configurable DL PRS transmission period is 10240 milliseconds. Currently, the configuration of DL PRS supports flexible subcarrier spacing including 15KHz, 30KHz, 60KHz and 120KHz. In the case of different subcarrier spacing, the configurable DL PRS transmission period value range can be the same. Figure 10 shows a schematic diagram of resources for transmitting DL PRS when the comb size is 2 and the RE offset is 0 and 1 respectively.

[0073] The repetition factor of the above-mentioned DL PRS resource is used to indicate the number of repeated transmissions of the DL PRS resource in each DL PRS transmission cycle. At present, the repeated transmission of the same DL PRS resource can be used by the terminal device to aggregate the DL PRS energy of multiple transmissions, which helps to increase the coverage distance of the DL PRS and improve the positioning accuracy. In the FR2 system, the repeated transmission of the DL PRS resource can also be used by the terminal device to perform receiving beam scanning operations. The terminal device can use different receiving beams to receive the repeated transmission of the same DL PRS resource, so as to find the best TRP transmission beam and terminal device receiving beam matching. On the other hand, the repeated transmission of DL PRS resources will increase the transmission overhead of DLPRS. At present, in order to control the transmission overhead, in the 3GPP NR R16 specification, the repetition factor of DL PRS resources is 1, 2, 4, 6, 8, 16 and 32.

[0074] The time interval for repeated transmission of the DL PRS resource is used to indicate the number of time slots between two consecutive repeated transmissions of the same DL PRS resource.

[0075] The above-mentioned DL PRS silence configuration is used to instruct DL PRS not to send DL PRS on certain allocated time-frequency resources. The silence configuration can be understood as DL PRS not being sent on all allocated time-frequency resources, but intentionally not being sent on certain designated time-frequency resources. On the one hand, the silence configuration can avoid conflicts between DL PRS and other signals (such as synchronization signal block (SSB)). On the other hand, the silence configuration can avoid interference between signals sent by different TRPs. For example, the silence configuration can instruct the TRP that is closer to the terminal device not to send DL PRS, and configure the TRP that is farther away from the terminal device to send DL PRS. In this way, the terminal device can receive the DL PRS from the farther TRP without being interfered with by the TRP that instructs silence.

[0076] The number of OFDM symbols occupied by the above DL PRS resource is used to indicate the number of OFDM symbols allocated to one DL PRS resource in one time slot.

[0077] Typically, the DL PRS configuration parameters included in the parameters of the above-mentioned TRP layer can be applied to all DL PRS resources in the DL PRS resource set corresponding to the TRP layer. Therefore, the DL PRS resources belonging to the same DL PRS resource set will send DL PRS with the same transmission period and the same number of repeated transmissions, and the DL PRS will occupy the same number of OFDM symbols.

[0078] In some implementations, for each DL PRS resource, the DL PRS configuration parameters may also include: DL PRS resource identification ID (expressed by "nr-DL-PRS-ResourceID"); DL PRS sequence ID (expressed by "dl-PRS-SequenceID"); DL PRS starting frequency domain resource unit offset (expressed by "dl-PRS-CombSizeN-AndReOffset"); DL PRS resource slot offset (expressed by "dl-PRS-ResourceSlotOffset"); DL PRS OFDM symbol offset (expressed by "dl-PRS-ResourceSymbolOffset"); DL PRS Quasi Co-Location (QCL) information (expressed by "dl-PRS-QCL-Info").

[0079] The starting frequency domain resource unit offset of the DL PRS is used to indicate the frequency domain resource unit offset value used for resource mapping on the first allocated OFDM symbol of the DL PRS resource in a time slot. Generally, based on this parameter and the relative offset value defined in TS38.211, the terminal device can determine the frequency domain resource unit offset value used for resource mapping on each OFDM symbol.

[0080] The resource time slot offset of the DL PRS is used to indicate the time slot offset relative to the DL PRS resource set. This parameter can determine the time slot position of each DL PRS resource.

[0081] The OFDM symbol offset of the DL PRS is used to indicate the time-frequency resource allocation position of the DL PRS resource in a time slot. This parameter can be used to indicate the index number of the starting OFDM symbol in the time slot.

[0082] The QCL information of the DL PRS is used to indicate the QCL information of the DL PRS.

[0083] Sidelink-based positioning

[0084] Side-stream positioning is one of the enhancements to R18 positioning technology. This topic will consider supporting scenarios and requirements for NR positioning use cases within, partially within, and outside cellular network coverage. It will also consider positioning requirements for V2X use cases, public safety use cases, commercial use cases, and Industrial Internet of Things (IIOT) use cases, and support the following functions: absolute positioning, ranging / direction finding, and relative positioning; research on positioning methods that combine side-stream measurements with Uu interface measurements; research on side-stream positioning reference signals, including signal design, physical layer control signaling, resource allocation, physical layer measurements, and related physical layer processes; and research on positioning system architecture and signaling processes, such as configuration and measurement reporting.

[0085] For absolute positioning, a terminal device can directly determine its absolute location based on measurement results, or device-based absolute positioning. Alternatively, the terminal device can report the measurement results to a positioning server, such as a LMF, which then calculates the terminal device's absolute position and notifies the terminal device. This approach is known as device-assisted absolute positioning. For ranging / direction finding or relative positioning, the terminal device can estimate the round-trip time, angle of arrival, signal strength, and other information of the received positioning reference signal to estimate relative distance and direction.

[0086] As mentioned above, it is currently hoped that positioning technology can be enhanced by introducing positioning based on sidelinks. In order to facilitate understanding of the present application, the following first introduces the time domain location of the sidelink communication system SL PRS resources in the embodiment of the present application.

[0087] Assuming that the time domain unit set may include one or more time domain units, in some implementations, all time domain units in the time domain unit set may be used to transmit the SL PRS, that is, the time domain units included in the time domain unit set are SL PRS resources. In other implementations, some time domain units in the time domain unit set may be used to transmit the SL PRS.

[0088] In some implementations, the time domain unit for transmitting the SL PRS in the time domain unit set may be divided into one or more SL PRS resources, wherein the SL PRS resource may be reserved or selected as a whole by a terminal device, or in other words, the SL PRS resource may be a basic time domain unit for resource reservation by the terminal device.

[0089] In an embodiment of the present application, if the time domain unit used to transmit the SL PRS in the time domain unit set can be divided into multiple SL PRS resources, it helps to improve the flexibility of SL PRS resource selection. If the time domain unit used to transmit the SL PRS in the time domain unit set can be divided into one SL PRS resource, it helps to simplify the complexity of SL PRS resource reservation or selection.

[0090] In some implementations, one or more time domain units included in an SL PRS resource may belong to a resource pool (e.g., an SLPRS resource pool). In other implementations, the time domain units of the SL PRS resource included in a time domain unit set are less than or equal to the number of time domain units in the time domain unit set that belong to the sidelink resource pool.

[0091] In some implementations, the SL PRS resource can also be used to transmit a PSSCH demodulation reference signal (DMRS). In this case, the PSSCH DMRS can be referred to as a second-type SL PRS. Correspondingly, the SL PRS can be referred to as a first-type SLPRS. Of course, in the embodiment of the present application, the above-mentioned SL PRS resource can also be used only to transmit the first-type SL PRS.

[0092] Taking the time domain unit set as a time slot and the time domain unit set as a symbol as an example, the SL PRS resource can be composed of one or more symbols belonging to the SL PRS resource pool, and the symbols belonging to the same SL PRS resource can be located in the same time slot, and the symbol of the SL PRS resource is less than or equal to the number of symbols belonging to the SL PRS resource pool in a time slot.

[0093] In some implementations, an SL PRS resource in a resource pool occupies multiple continuous time domain units in the time domain. Taking a symbol as a time domain unit as an example, an SL PRS resource in a resource pool occupies multiple continuous symbols in the time domain. Of course, in an embodiment of the present application, the time domain units occupied by the SL PRS resource in the time domain may not be continuous in the time domain, or only some of the time domain units may be continuous in the time domain. This embodiment of the present application is not limited to this.

[0094] The above-mentioned time domain unit set can be any time domain unit set in a known communication system, such as a time slot, a subframe, a frame, etc. Of course, the above-mentioned time domain unit set can also be any time domain unit set introduced in a future communication system, which is not limited in the embodiments of the present application.

[0095] In addition, the time domain unit may be any time domain unit in a known communication system, such as a symbol, a time slot, a subframe, a frame, etc. Of course, the time domain unit may also be any time domain unit introduced in a future communication system, which is not limited in the embodiments of the present application.

[0096] The following text takes symbols as time domain units and correspondingly, time slots as time domain unit sets as an example, and introduces the SL PRS resources of an embodiment of the present application in combination with Figures 11 to 12.

[0097] In some implementations, the symbols used to transmit the SL PRS in a time slot can be considered as one SL PRS resource. Referring to Figure 11 , assume that a time slot includes 14 symbols: symbols 0 to 13, and that symbols 0 to 13 can all be used to transmit the SL PRS. In this case, symbols 0 to 13 can be considered as one SL PRS resource.

[0098] In some implementations, the symbols used to transmit the SL PRS in a time slot can be considered as multiple SL PRS resources. Referring to Figure 11 , assume that the symbol set includes 14 symbols: symbols 0 to 13. Symbols 0 to 5 can be considered as the first SL PRS resource, symbols 6 to 9 can be considered as the second SL PRS resource, and symbols 10 to 13 can be considered as the third SL PRS resource.

[0099] In the second resource selection mode described above, when a terminal device performs resource exclusion, it uses single-slot resources as resource units. That is, each element in the candidate resource set obtained after resource exclusion is a single-slot resource, where a single-slot resource is a resource consisting of L_subch consecutive subchannels within a time slot. However, in the process of selecting SL PRS resources, how the terminal device determines the resource unit when performing resource exclusion is an unresolved issue.

[0100] Therefore, an embodiment of the present application provides a method for wireless communication, in which the terminal device can determine the configuration information (also known as "first configuration information") used to configure the SL PRS resources in the resource pool, which helps the terminal device determine the resource unit used when performing resource exclusion during the process of selecting SL PRS resources.

[0101] In some scenarios, the resource pool may be a resource pool with frequency division multiplexing resources. In this case, if the SL PRS is transmitted on other frequency domain resources in the resource pool, it may affect the reception of sidelink information (e.g., sidelink channel and / or sidelink information) transmitted on other frequency domain resources. Therefore, the resource pool used for SL PRS transmission can occupy the entire sidelink BWP. In other words, the resource pool may include a resource pool occupying one sidelink BWP.

[0102] Of course, in an embodiment of the present application, the resource pool may include a shared resource pool or a dedicated resource pool between sideline communications. The shared resource pool between the sideline communications may be understood as including resources for sending other sideline information other than SL PRS and SL PRS resources, wherein the other sideline information may include PSSCH, wherein the PSSCH may be, for example, a PSSCH sent to a backward terminal device (i.e., a terminal device in 3GPP version 16 and version 17). The dedicated resource pool may be understood as a resource pool that does not include resources for sending PSSCH but includes SL PRS resources.

[0103] The following describes a method for wireless communication according to an embodiment of the present application in conjunction with Figure 13. Figure 13 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application. The method shown in Figure 13 includes step S1310.

[0104] In step S1310, the terminal device determines first configuration information.

[0105] The first configuration information is used to configure the SL PRS resources in the resource pool. In some implementations, the terminal device can determine the first configuration information based on the configuration information of the resource pool, wherein the configuration information of the resource pool can be pre-configured or configured, which is not limited in this embodiment of the application.

[0106] In some implementations, the first configuration information may include one or more of the following: a first parameter, a second parameter, and a third parameter. The above parameters are respectively introduced below.

[0107] The above-mentioned first parameter can be used to indicate the time domain position of the SL PRS resource allowed in a time slot of the resource pool.

[0108] In some implementations, the first parameter includes a fourth parameter, wherein the fourth parameter is used to indicate the starting symbol allowed to be occupied by the SL PRS resource in a time slot, or in other words, the fourth parameter is used to indicate the allowed SL PRS starting symbol position in a time slot.

[0109] In some scenarios, the starting symbol for SL PRS resource occupation allowed in a time slot may be one or more. For example, as shown in FIG11 , all 14 symbols included in a time slot can be used for SL PRS transmission (or SL PRS sending), and the starting symbol for SL PRS resource occupation allowed in the time slot is symbol 0. For another example, as shown in FIG12 , all 14 symbols included in a time slot can be used for SL PRS transmission, and the starting symbols for SL PRS resource occupation allowed in the time slot may include multiple symbols: symbol 0, symbol 6, and symbol 10.

[0110] In some other implementations, the first parameter may include a fifth parameter, where the fifth parameter is used to indicate the number of symbols allowed to be occupied by the SLPRS resource in a time slot.

[0111] In some implementations, the fifth parameter may be used to indicate the minimum number of symbols allowed to be occupied by an SL PRS resource in a time slot (which may be represented by S_min). In other words, the number of symbols contained in any SL PRS resource in a time slot should not be less than S_min. For example, the number of consecutive symbols contained in any SL PRS resource in a time slot should not be less than S_min.

[0112] Accordingly, in some implementations, when the higher layer of the terminal device triggers the physical layer of the terminal device to perform resource selection or reselection, the physical layer of the terminal device should regard all SL PRS resources configured or pre-configured within the resource selection window as a candidate resource set, and the number of consecutive symbols contained in any SLPRS resource should be no less than S_min.

[0113] It should be noted that, in the embodiment of the present application, the above parameter S_min can be applicable to scenarios where the time domain resources occupied by the SL PRS resources include multiple consecutive symbols starting with a certain symbol in the time slot, that is, scenarios where the starting symbol of the time domain resources occupied by the SL PRS resources is relatively flexible. Of course, this parameter can also be used in other scenarios, and the embodiment of the present application is not limited to this.

[0114] In addition, in the above scenario, in order to ensure that the receiving terminal can correctly receive the SL PRS, the sending time of the indication signaling indicating the sending of the SL PRS should be earlier than the sending time of the indicated SL PRS, and the time interval between the end point of the indication signaling and the starting point of the SL PRS should be greater than a specific threshold to ensure that the receiving terminal can decode the indication signaling between the sending of the SL PRS.

[0115] In an embodiment of the present application, the time domain resources occupied by the SL PRS resources include multiple consecutive symbols starting with a certain symbol in the time slot. That is to say, the starting point and end point of the time domain resources occupied by the SL PRS resources are relatively flexible, which helps to improve the flexibility of SL PRS resource selection.

[0116] In some scenarios, the number of symbols allowed to be occupied by SL PRS resources in a time slot may include one or more. In other scenarios, the number of symbols allowed to be occupied by SL PRS resources in multiple time slots in the resource pool may be different. For example, if there are time slots with different time domain lengths in the resource pool, the allowed SL PRS starting positions may be different in different time slots. That is to say, the resource pool includes a first time slot and a second time slot, the time domain lengths of the first time slot and the second time slot are different, the first time slot corresponds to the first value of the fourth parameter, the second time slot corresponds to the second value of the fourth parameter, and the first value and the second value are different.

[0117] For example, assuming that 14 symbols included in a time slot are available for SL PRS transmission, the SL PRS starting symbols allowed in the time slot may be {0, 6, 10}. Assuming that 10 symbols included in a time slot are available for SL PRS transmission, the SL PRS starting symbols allowed in the time slot may be {0, 6}.

[0118] Of course, in the embodiment of the present application, the number of symbols allowed to be occupied by SL PRS resources in multiple time slots in the resource pool can be the same.

[0119] As described above, multiple start symbols may be allowed in a time slot. In some implementations, the multiple start symbols include a first symbol and a second symbol that are adjacent in time domain position, and the SL PRS resource corresponding to the first symbol includes the first symbol and symbols between the first symbol and the second symbol in the time domain.

[0120] That is, assuming that a time slot includes two starting symbols, i and i+n, the SL PRS resources corresponding to starting symbol i include the symbols between starting symbol i and starting symbol i+n. For example, as shown in Figure 12, the first starting symbol in the time slot is symbol 0 and the second starting symbol is symbol 6. Then the SL PRS resources corresponding to symbol 0 may include symbols 0-5.

[0121] In other implementations, the last starting symbol among multiple starting symbols is the third symbol, the last symbol among the symbols that can be used for SLPRS transmission in a time slot is the fourth symbol, and the SL PRS resource corresponding to the third symbol occupies the third symbol, the fourth symbol, and the symbols between the third symbol and the fourth symbol in the time domain.

[0122] That is, assuming that starting symbol j is the last starting symbol in a time slot, and the last symbol in the time slot that can be used for SL PRS transmission is symbol j+m, the SL PRS resources corresponding to starting symbol j include starting symbol j, symbol j+m, and symbols between starting symbol j and symbol j+m in the time domain. For example, referring to Figure 12 , if the last starting symbol in a time slot is symbol 10, and the last symbol in the time slot that can be used for SL PRS transmission is symbol 13, the SL PRS resources corresponding to symbol 10 may include four symbols, namely, symbols 10 to 13.

[0123] In some scenarios, the above-mentioned time slot may include symbols for automatic gain control, symbols for transceiver conversion, and symbols occupied by the side channel for indicating SL PRS transmission. At this time, in an embodiment of the present application, the symbols that can be used for SL PRS transmission (also called "target symbols") may include one or more of the above-mentioned symbols. In other embodiments of the present application, the symbols occupied by SL PRS resources (also called "target symbols") may include one or more of the above-mentioned symbols.

[0124] It should be noted that the applicable scenarios of the fourth and fifth parameters mentioned above in the embodiments of the present application are not limited. In some implementations, the above parameters may be applicable to one or more of the following scenarios: Scenario 1, the number of frequency domain units (for example, resource blocks (RB)) occupied by a SL PRS in the resource pool is equal to all RBs (also known as the "first bandwidth") in the resource pool that can be used for SL PRS transmission, and the frequency domain resources occupied by the SL PRS resources include the target resource element (RE) (or specific RE) in the first frequency domain unit in the resource pool that can be used for SL PRS transmission. The frequency domain position is started with the target resource element (RE) (or specific RE) and the REs are spaced apart by C, where C is the SL PRS comb tooth size configured in the resource pool. In addition, the time domain resources occupied by the SL PRS resources include a plurality of consecutive symbols starting from a specific symbol in a time slot. The specific RE and / or specific symbol can be understood as parameters that are pre-configured, pre-defined or configured by the network device.

[0125] Scenario 2: The number of frequency domain units (e.g., RBs) occupied by an SL PRS in the resource pool is less than or equal to the first bandwidth, and the frequency domain resources occupied by the SLPRS resources include a specific RE in the first RB occupied by the SL PRS resource as the starting frequency domain position and an RE with an interval of C, where C is the SL PRS comb tooth size configured in the resource pool. In addition, the time domain resources occupied by the SL PRS resources include a plurality of consecutive symbols starting from a specific symbol in a time slot. Among them, the specific symbol can be understood as a symbol that is preconfigured, predefined, or configured by the network device.

[0126] The second parameter may be used to indicate the comb tooth size of the SL PRS resource in the resource pool, wherein the comb tooth size is used to indicate the number of symbols spaced between two adjacent comb tooth resources occupied by the SL PRS resource.

[0127] In some implementations, the comb tooth sizes of the SL PRS resources within a resource pool may be the same. For example, the comb tooth sizes of the SL PRS resources within a resource pool may be one of {1, 2, 4, 6, 8, 12}. Of course, in embodiments of the present application, the comb tooth sizes of the SL PRS resources within a resource pool may be different. For example, the comb tooth sizes of the SL PRS resources within a resource pool may be multiple of {1, 2, 4, 6, 8, 12}.

[0128] In an embodiment of the present application, the comb tooth sizes of the SL PRS resources in the resource pool can be the same, which helps to simplify the setting method of the comb tooth size.

[0129] In the embodiment of the present application, the comb tooth size may be configured by a configuration parameter of the resource pool or predefined by a protocol. For example, if the comb tooth sizes of the SL PRS resources in the resource pool are the same, the comb tooth size may be configured by the configuration parameter of the resource pool.

[0130] In some implementations, SL PRS resources with different time domain starting positions in the resource pool correspond to different comb tooth sizes. For example, referring to Figure 12 again, the comb tooth size corresponding to the SL PRS resource with symbol 0 as the starting symbol can be 4. The comb tooth size corresponding to the SL PRS resource with symbol 6 as the starting symbol can be 2. The comb tooth size corresponding to the SL PRS resource with symbol 10 as the starting symbol can be 2. SL PRS resources with different starting positions correspond to different comb tooth sizes, which helps to improve the rationality of the comb tooth size. Of course, in an embodiment of the present application, SL PRS resources with different starting positions can also correspond to the same comb tooth size.

[0131] In an embodiment of the present application, the comb tooth size can be directly indicated by the second parameter. For example, for an SL PRS resource with symbol 0 as the starting symbol, the second parameter C0 can be 4. For an SL PRS resource with symbol 6 as the starting symbol, the second parameter C1 can be 2. For an SL PRS resource with symbol 10 as the starting symbol, the second parameter C1 can be 2. Of course, in an embodiment of the present application, the comb tooth size can also be predefined by a protocol. For example, the protocol can define the correspondence between the comb tooth size and the starting symbol. Accordingly, the comb tooth size corresponding to the starting symbol can be determined based on the starting symbol. This embodiment of the present application is not limited to this.

[0132] In some implementations, SL PRS resources with different time domain lengths in the resource pool correspond to different comb tooth sizes. For example, referring to Figure 12, for the first SL PRS resource, its time domain length is 6 symbols, and the corresponding comb tooth size can be 4. For the second SL PRS resource and the third SL PRS resource, its time domain length is 4 symbols, and the corresponding comb tooth size can be 2. SL PRS resources with different time domain lengths correspond to different comb tooth sizes, which helps to improve the rationality of the comb tooth size. Of course, in an embodiment of the present application, SL PRS resources with different time domain lengths can also correspond to the same comb tooth size.

[0133] In an embodiment of the present application, the comb tooth size can be directly indicated by the second parameter. For example, referring to FIG12 , for the first SL PRS resource, the second parameter C0 can be 4. For the second SL PRS resource and the third SL PRS resource, the second parameter C1 can be 2. Of course, in an embodiment of the present application, the comb tooth size can also be predefined by a protocol. For example, a protocol can define the correspondence between the comb tooth size and the starting symbol. Accordingly, the comb tooth size corresponding to the starting symbol can be determined based on the starting symbol. This embodiment of the present application is not limited to this.

[0134] In some implementations, the comb tooth size of the SL PRS resources in the resource pool may be determined based on the number of symbols included in the SL PRS resources or the number of symbols included in the SL PRS resources that may be used to transmit the SL PRS.

[0135] For example, assuming that the SL PRS resource includes N symbols, and the number of symbols in the SL PRS resource that cannot be used for SL PRS transmission is Y, accordingly, the comb tooth size corresponding to the SL PRS resource can be the value closest to NY in {1, 2, 4, 6, 8, 12}.

[0136] For another example, assuming that the SL PRS resource includes N symbols, and the number of symbols in the SL PRS resource that cannot be used for SL PRS transmission is Y, accordingly, the comb tooth size corresponding to the SL PRS resource can be a value not greater than NY in {1, 2, 4, 6, 8, 12}.

[0137] It should be noted that if the SL PRS resource includes only one automatic gain control (AGC) symbol and one transceiver conversion symbol and cannot be used for SL PRS transmission, then Y = 2. If the SL PRS resource includes, in addition to one AGC symbol and one transceiver conversion symbol, a symbol for indicating the SL channel for SL PRS transmission and cannot be used for SL PRS transmission, then Y = 3.

[0138] In addition, in an embodiment of the present application, for a resource pool, the comb tooth size is determined based on the number of symbols contained in the SL PRS resource or the number of symbols contained in the SL PRS resource that can be used to transmit the SL PRS, which can be predefined by a standard. Of course, in an embodiment of the present application, the above-mentioned method for determining the comb tooth size can also be configured or preconfigured by the network device.

[0139] It should be noted that the applicable scenarios of the above-mentioned third parameter in the embodiment of the present application are not limited. In some implementations, the above-mentioned parameters may be applicable to scenario 1 and / or scenario 2. In other implementations, the third parameter is also applicable to scenario 3 and / or scenario 4. In scenario 3, the number of frequency domain units (for example, RBs) occupied by an SL PRS resource in the resource pool is equal to the first bandwidth, and the frequency domain resources occupied by the SL PRS resource are resource elements with an interval of C starting from a specific RE in the first RB in the resource pool that can be used for SL PRS transmission, where C is the SL PRS comb tooth size configured in the resource pool. In addition, the time domain resources occupied by the SL PRS resource include multiple consecutive symbols starting from a symbol in a time slot.

[0140] Scenario 4: The number of frequency domain units (e.g., RBs) occupied by an SL PRS resource in the resource pool is less than or equal to the first bandwidth, and the frequency domain resources occupied by the SL PRS resource include REs with a starting frequency domain position of a specific RE in the first RB occupied by the SL PRS resource and an interval of C, where C is the SL PRS comb tooth size configured in the resource pool. In addition, the time domain resources occupied by the SL PRS resource include multiple consecutive symbols starting from a symbol in a time slot.

[0141] The third parameter is used to indicate the frequency domain location of the SL PRS resource allowed in the resource pool. In some implementations, the third parameter may include a sixth parameter and / or a seventh parameter.

[0142] The sixth parameter is used to indicate the starting RE index allowed to be occupied by SL PRS resources in the resource pool.

[0143] In some implementations, the starting RE index indicated by the sixth parameter is any value within the range of values ​​corresponding to the comb tooth size. For example, assuming the comb tooth size ranges from [0, C-1], the starting RE index is any value within the range from [0, C-1]. This configuration of the starting RE helps increase the flexibility of SL PRS resource selection.

[0144] In the embodiment of the present application, one or more starting REs in the resource pool can be determined by resource pool configuration parameters. Of course, in the embodiment of the present application, the starting RE can also be predefined by a protocol or configured by a network device.

[0145] In some implementations, multiple SL PRS resources within a resource pool may correspond to different starting REs. For example, multiple SL PRS resources containing different numbers of symbols may correspond to different starting REs. For another example, multiple SL PRS resources corresponding to different starting symbols may correspond to different starting REs.

[0146] In the embodiment of the present application, different SL PRS resources may correspond to different starting REs, which helps to ensure that there is a certain number of RE intervals between different SL PRS resources, thereby reducing in-band leakage (IBE) interference. Of course, if the above problem is not considered, multiple SL PRS resources may correspond to the same starting RE.

[0147] In some implementations, the sixth parameter may indicate a starting RE corresponding to each SL PRS resource. In some implementations, the resource pool may include a first SL PRS resource and a second SL PRS resource, and if the comb tooth sizes allowed by the first SL PRS resource and the second SL PRS resource are different, the sixth parameter includes parameters corresponding to the first SL PRS resource and the second SL PRS resource, respectively, wherein the first SL PRS resource and the second SL PRS resource contain a different number of symbols, or the first SL PRS resource and the second SL PRS resource have different starting symbols within a time slot of the resource pool.

[0148] The seventh parameter is used to indicate the RE interval between adjacent SL PRS resources in the resource pool, or in other words, to indicate the number of REs between adjacent SL PRS resources in the resource pool.

[0149] In some implementations, the RE interval d can be explicitly indicated by the seventh parameter, where the RE interval d is a value not greater than the comb tooth size C. Accordingly, the starting RE index corresponding to the allowed SL PRS resources in the resource pool can be 0, 0+d, ..., 0+floor(C / d)*d, where floor (.) indicates rounding down.

[0150] It should be noted that the applicable scenarios of the fourth parameter in the embodiment of the present application are not limited. In some implementations, the fourth parameter can be applicable to one or more of scenarios 1 to 4.

[0151] In some implementations, if the resource pool is a first type of resource pool, the first configuration information includes parameters indicating the time domain position that the SL PRS resource is allowed to occupy within a time slot of the resource pool; or, if the resource pool is a second type of resource pool, an SL PRS resource in the resource pool occupies all time domain resources that can be used for SL PRS transmission within a time slot.

[0152] In some implementations, the first type of resource pool may be a resource pool for performing channel sensing based on first measurement information, and the second type of resource pool may be a resource pool for performing channel sensing based on second measurement information; wherein the first measurement information is measurement information for DMRS of PSCCH, and the second measurement information is measurement information for DMRS of PSSCH.

[0153] For example, if the resource pool is configured to measure L1RSRP through DMRS of PSCCH for channel sensing operation, the first configuration information can configure the starting symbol corresponding to the SL PRS resources allowed in each time slot in the resource pool (i.e., the fourth parameter), and the number of symbols occupied by the SL PRS resources corresponding to the starting symbol (i.e., the fifth parameter).

[0154] For another example, if the resource pool is configured to measure L1RSRP through PSSCH DMRS for channel sensing operations, the terminal device considers that one SL PRS resource includes all symbols that can be used for SL PRS transmission in a time slot. Among them, the symbols that can be used for SL PRS transmission may not include: symbols occupied by PSSCH DMRS; and / or symbols occupied by other physical channels.

[0155] In an embodiment of the present application, since the time domain resources occupied by PSCCH are usually in the front time domain position in a time slot, there may be more options for the time domain position occupied by SL PRS resources in the resource pool for channel monitoring based on the first measurement information. Therefore, the parameters of the time domain position allowed to be occupied by SL PRS resources in a time slot of the resource pool can be indicated by the first configuration information, which helps to improve the rationality of SLPRS resources.

[0156] Since the time domain resources occupied by PSSCH are usually more time domain resources in a time slot, there may not be many choices for the time domain position occupied by SL PRS resources in the resource pool for channel monitoring based on the second measurement information. Therefore, SL PRS resources can occupy all time domain resources that can be used for SL PRS transmission in a time slot.

[0157] In addition, in an embodiment of the present application, the above-mentioned scheme of associating the time domain position occupied by the SL PRS with the resource pool type can be applicable to one or more of the following scenarios: Scenario 5, the number of frequency domain units (for example, RBs) occupied by an SL PRS resource in the resource pool is equal to the first bandwidth, and the frequency domain resources occupied by the SL PRS resource include REs with a frequency domain position starting from the target RE (or specific RE) in the first frequency domain unit of the resource pool that can be used for SL PRS transmission and an interval of C, where C is the SL PRS comb tooth size configured in the resource pool.

[0158] Scenario 6: The number of frequency domain units (for example, RBs) occupied by an SL PRS resource in the resource pool is less than or equal to the first bandwidth, and the frequency domain resources occupied by the SL PRS resource include REs with a starting frequency domain position of a specific RE within the first RB occupied by the SL PRS resource and an interval of C, where C is the SL PRS comb tooth size configured in the resource pool.

[0159] The above introduces the parameters that the first configuration information may include in an embodiment of the present application. The following introduces a scheme in which the terminal device performs resource selection or resource reselection based on the first configuration information in an embodiment of the present application.

[0160] In some implementations, the above method further includes: step S1320, the terminal device performs resource selection / reselection for SL PRS resources in the resource pool according to the first configuration information.

[0161] In some scenarios, if the number of frequency domain units (e.g., RBs) occupied by an SL PRS resource in a resource pool is equal to the first bandwidth, the frequency domain resources occupied by the SL PRS resource may include REs with an interval of C starting from the target RE within the first RB in the resource pool that can be used for SL PRS transmission, where C represents the comb tooth size corresponding to the SL PRS resource.

[0162] Accordingly, in the above case, the SL PRS resource can be expressed as R(e, y, s), where e represents the index of the starting RE of the SL PRS resource in the RB, y represents the index of the time slot where the resource unit corresponding to the SL PRS resource is located, and s represents the index of the starting symbol of the SL PRS resource in the time slot.

[0163] In some implementations, when the higher layer (e.g., MAC layer) of the terminal device triggers the physical layer of the terminal device to select or reselect resources, the physical layer of the terminal device may regard all SL PRS resources configured or pre-configured within the resource selection window as a candidate resource set. Then, the physical layer of the terminal device may exclude resources that are reserved by other terminal devices and / or whose interference level may be higher than a specific threshold from the candidate resource set based on the channel sensing result. Finally, the physical layer of the terminal device reports the remaining resources to the higher layer of the terminal device.

[0164] It should be noted that the above-mentioned specific threshold can be configured or pre-configured by the network device, or can also be pre-defined by the protocol, and the embodiments of the present application do not limit this.

[0165] In other scenarios, if the number of frequency domain units (eg, RBs) occupied by a SL PRS resource supported by the resource pool is less than or equal to the first bandwidth, resource selection / reselection is further based on the eighth parameter and / or the ninth parameter.

[0166] The eighth parameter is used to indicate the index of the first frequency domain unit of the SL PRS resource in the resource pool (denoted by "x"). In some implementations, the frequency domain unit may be F consecutive RBs, where F ≥ 1 and is a positive integer.

[0167] In the embodiments of the present application, the value of F can be configured, pre-configured, or defined by a standard. For example, F can be defined by a standard as 1, i.e., the frequency domain unit is 1 RB. For another example, F can be configured or pre-configured by a network device to be an integer greater than 1.

[0168] In some implementations, if the value of F is 1, the frequency domain unit may be referred to as a subchannel. Accordingly, the number of subchannels included in the resource pool is CEIL(N_RB / F), where N_RB is the total number of RBs included in the resource pool configured or preconfigured by the network device.

[0169] In some scenarios, if F cannot divide N_RB evenly, then for the sub-channel with the largest index value in the resource pool, the number of RBs it contains is mod(N_RB,F), where mod(.) represents a modulo operation, and the number of RBs contained in other sub-channels in the resource pool can be F.

[0170] The ninth parameter is used to indicate the number of frequency domain units included in the SL PRS selected by the terminal device (which can be represented by "N_f").

[0171] In some implementations, the ninth parameter may be the exact value of the number of frequency domain units contained in the SL PRS selected by the terminal device. For example, the upper layer of the terminal device may indicate the exact value of N_f through the ninth parameter, and accordingly, the physical layer of the terminal device may regard all SL PRS resources configured or pre-configured in the resource selection window as a candidate resource set, and the number of frequency domain units contained in any SL PRS resource is N_f. Afterwards, the physical layer of the terminal device may exclude resources based on the channel sensing results, and finally, the physical layer of the terminal device may report the remaining resources to the upper layer of the terminal device.

[0172] In some other implementations, the ninth parameter is used to indicate the minimum number of frequency domain units. For example, the upper layer of the terminal device can indicate the minimum value of N_f, and accordingly, the physical layer of the terminal device can regard all SL PRS resources configured or pre-configured in the resource selection window as a set of candidate resources, and the number of frequency domain units contained in any SL PRS resource is not less than N_f. Afterwards, the physical layer of the terminal device can regard SL PRS resources with different N_f values ​​as candidate resources, and then exclude resources based on the channel listening results. Finally, the physical layer of the terminal device can report the remaining resources to the upper layer of the terminal device.

[0173] In some implementations, if the number of frequency domain units (e.g., RBs) occupied by a SL PRS resource supported by the resource pool is less than or equal to the first bandwidth, the SL PRS resource is represented as R(x, N_f, e, y, s), where e represents the index of the starting RE of the SL PRS resource within the RB, y represents the index of the time slot where the resource unit is located, and s represents the index of the starting symbol of the SL PRS resource within the time slot.

[0174] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 13. The device embodiment of the present application is described in detail below in conjunction with Figures 14 and 15. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0175] FIG14 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device 1400 shown in FIG14 includes: a processing unit 1410 .

[0176] The processing unit 1410 is configured to determine first configuration information, where the first configuration information is used to configure sidelink positioning reference signal SL PRS resources in a resource pool.

[0177] In some implementations, the first configuration information includes one or more of the following: a first parameter for indicating the time domain position of the SL PRS resources allowed within a time slot of the resource pool; a second parameter for indicating the comb tooth size of the SL PRS resources within the resource pool; and a third parameter for indicating the frequency domain position of the SL PRS resources allowed within the resource pool.

[0178] In some implementations, the first parameter includes one or more of the following: a fourth parameter for indicating the starting symbol that the SL PRS resource is allowed to occupy within the one time slot; and a fifth parameter for indicating the number of symbols that the SL PRS resource is allowed to occupy within the one time slot.

[0179] In some implementations, the resource pool includes a first time slot and a second time slot, the time domain lengths of the first time slot and the second time slot are different, the first time slot corresponds to a first value of the fourth parameter, the second time slot corresponds to a second value of the fourth parameter, and the first value and the second value are different.

[0180] In some implementations, multiple starting symbols are allowed in the one time slot, and the multiple starting symbols include a first symbol and a second symbol that are adjacent in time domain position, and the SL PRS resource corresponding to the first symbol includes the first symbol and the symbol between the first symbol and the second symbol in the time domain; or multiple starting symbols are allowed in the one time slot, the last starting symbol among the multiple starting symbols is the third symbol, and the last symbol among the symbols that can be used for SL PRS transmission in the one time slot is the fourth symbol, and the SL PRS resource corresponding to the third symbol occupies the third symbol, the fourth symbol, and the symbol between the third symbol and the fourth symbol in the time domain.

[0181] In some implementations, the target symbol within the one time slot includes one or more of the following: a symbol for automatic gain control within the one time slot; a symbol for transceiver conversion within the one time slot; and a symbol occupied by a side channel for indicating SL PRS transmission within the one time slot; wherein the target symbol is a symbol that can be used for SL PRS transmission within the one time slot or a symbol occupied by an SL PRS resource within the one time slot.

[0182] In some implementations, the fifth parameter is used to indicate the minimum number of symbols allowed to be occupied by SL PRS resources in the one time slot.

[0183] In some implementations, one SL PRS resource in the resource pool occupies multiple consecutive symbols in the time domain.

[0184] In some implementations, the comb tooth size of the SL PRS resources in the resource pool satisfies one or more of the following: the comb tooth size of the SL PRS resources in the resource pool is the same; SL PRS resources with different time domain starting positions in the resource pool correspond to different comb tooth sizes; SL PRS resources with different time domain lengths in the resource pool correspond to different comb tooth sizes; and the comb tooth size of the SLPRS resources in the resource pool is determined based on the number of symbols contained in the SL PRS resources or the number of symbols contained in the SL PRS resources that can be used to transmit SLPRS.

[0185] In some implementations, the third parameter includes one or more of the following: a sixth parameter for indicating the starting resource element RE index allowed to be occupied by SL PRS resources in the resource pool; and a seventh parameter for indicating the RE interval between adjacent SL PRS resources in the resource pool.

[0186] In some implementations, the RE index indicated by the sixth parameter is any value within the value range corresponding to the comb tooth size.

[0187] In some implementations, the resource pool includes a first SL PRS resource and a second SL PRS resource. If the comb tooth sizes allowed by the first SL PRS resource and the second SL PRS resource are different, the sixth parameter includes parameters corresponding to the first SL PRS resource and the second SL PRS resource respectively; wherein the first SL PRS resource and the second SL PRS resource contain different numbers of symbols, or the first SL PRS resource and the second SL PRS resource have different starting symbols within a time slot of the resource pool.

[0188] In some implementations, if the resource pool is a first type of resource pool, the first configuration information includes parameters indicating the time domain position that SL PRS resources are allowed to occupy within a time slot of the resource pool; or, if the resource pool is a second type of resource pool, an SL PRS in the resource pool occupies all time domain resources that can be used for SL PRS transmission within a time slot.

[0189] In some implementations, the first type of resource pool is a resource pool for performing channel monitoring based on first measurement information, and the second type of resource pool is a resource pool for performing channel monitoring based on second measurement information; wherein, the first measurement information is measurement information for DMRS of PSCCH, and the second measurement information is measurement information for DMRS of PSSCH.

[0190] In some implementations, the terminal device further includes: the terminal device performing resource selection / reselection for SL PRS resources in the resource pool according to the first configuration information.

[0191] In some implementations, if the number of frequency domain units (e.g., RBs) occupied by an SL PRS resource supported by the resource pool is less than or equal to the first bandwidth, the resource selection / reselection is also based on one or more of the following parameters: an eighth parameter for indicating the index of the first frequency domain unit of the SL PRS resource in the resource pool; and a ninth parameter for indicating the number of frequency domain units contained in the SL PRS selected by the terminal device; wherein the first bandwidth is the total bandwidth occupied by the resource blocks in the resource pool that can be used for SL PRS transmission, or in other words, the first bandwidth is the total frequency domain units (e.g., RBs) occupied by the resource blocks in the resource pool that can be used for SL PRS transmission.

[0192] In some implementations, the ninth parameter is used to indicate a minimum value of the number of the frequency domain units.

[0193] In some implementations, the resource pool includes one or more of the following resource pools: a resource pool occupying one sidewalk BWP; and a shared resource pool between the sidewalk communication.

[0194] In an optional embodiment, the processing unit 1410 may be a processor 1510. The terminal device 1400 may further include a transceiver 1530 and a memory 1520, as specifically shown in FIG15 .

[0195] Figure 15 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 15 indicate that the unit or module is optional. Apparatus 1500 may be used to implement the method described in the above method embodiment. Apparatus 1500 may be a chip, a terminal device, or a network device.

[0196] The device 1500 may include one or more processors 1510. The processor 1510 may support the device 1500 to implement the method described in the method embodiment above. The processor 1510 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0197] The apparatus 1500 may further include one or more memories 1520. The memories 1520 store programs that can be executed by the processor 1510, causing the processor 1510 to perform the methods described in the above method embodiments. The memories 1520 may be independent of the processor 1510 or integrated into the processor 1510.

[0198] The apparatus 1500 may further include a transceiver 1530. The processor 1510 may communicate with other devices or chips via the transceiver 1530. For example, the processor 1510 may transmit and receive data with other devices or chips via the transceiver 1530.

[0199] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0200] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0201] The present application also provides a computer program that can be applied to a terminal or network device provided in the present application, and enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0202] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0203] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0204] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0205] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0206] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0207] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0208] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0209] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0210] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0211] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of the solution of this embodiment according to actual needs.

[0212] 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.

[0213] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from 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 can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available 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 digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0214] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for wireless communication, characterized in that include: The terminal device determines first configuration information, where the first configuration information is used to configure sidelink positioning reference signal SL PRS resources in a resource pool.

2. The method according to claim 1, characterized in that The first configuration information includes one or more of the following: A first parameter is used to indicate the time domain position of the SL PRS resource allowed in a time slot of the resource pool; A second parameter is used to indicate the comb tooth size of the SL PRS resources in the resource pool; and The third parameter is used to indicate the frequency domain position of the SL PRS resources allowed in the resource pool.

3. The method according to claim 2, characterized in that The first parameter includes one or more of the following: A fourth parameter is used to indicate the starting symbol allowed to be occupied by SL PRS resources in the one time slot; and The fifth parameter is used to indicate the number of symbols allowed to be occupied by SL PRS resources in the said time slot.

4. The method according to claim 3, characterized in that The resource pool includes a first time slot and a second time slot, the time domain lengths of the first time slot and the second time slot are different, the first time slot corresponds to the first value of the fourth parameter, the second time slot corresponds to the second value of the fourth parameter, and the first value and the second value are different.

5. The method according to claim 3 or 4, characterized in that: A plurality of the starting symbols are allowed in the one time slot, the plurality of the starting symbols include a first symbol and a second symbol that are adjacent in time domain position, and the SL PRS resource corresponding to the first symbol includes the first symbol and symbols between the first symbol and the second symbol in the time domain; or Multiple starting symbols are allowed in the time slot, the last starting symbol among the multiple starting symbols is the third symbol, the last symbol among the symbols that can be used for SL PRS transmission in the time slot is the fourth symbol, and the SL PRS resource corresponding to the third symbol occupies the third symbol, the fourth symbol, and the symbols between the third symbol and the fourth symbol in the time domain.

6. The method according to claim 5, characterized in that The target symbol in the one time slot includes one or more of the following: A symbol for automatic gain control within the one time slot; Symbols used for transceiver conversion within the one time slot; and A symbol within the time slot used to indicate the side channel occupied by the SL PRS transmission; The target symbol is a symbol that can be used for SL PRS transmission in the one time slot or a symbol occupied by an SL PRS resource in the one time slot.

7. The method according to any one of claims 3 to 6, characterized in that The fifth parameter is used to indicate the minimum number of symbols allowed to be occupied by SL PRS resources in the time slot.

8. The method according to any one of claims 2 to 7, characterized in that One SL PRS resource in the resource pool occupies multiple consecutive symbols in the time domain.

9. The method according to any one of claims 2 to 8, characterized in that The comb tooth size of the SL PRS resources in the resource pool satisfies one or more of the following: The comb teeth sizes of the SL PRS resources in the resource pool are the same; SL PRS resources with different time domain starting positions in the resource pool correspond to different comb tooth sizes; SL PRS resources with different time domain lengths in the resource pool correspond to different comb tooth sizes; and The comb tooth size of the SL PRS resources in the resource pool is determined based on the number of symbols included in the SL PRS resources or the number of symbols included in the SL PRS resources that can be used to transmit the SL PRS.

10. The method according to any one of claims 2 to 9, characterized in that The third parameter includes one or more of the following: A sixth parameter is used to indicate the starting resource element RE index allowed to be occupied by SL PRS resources in the resource pool; and The seventh parameter is used to indicate the RE interval between adjacent SL PRS resources in the resource pool.

11. The method according to claim 10, characterized in that The RE index indicated by the sixth parameter is any value within the value range corresponding to the comb tooth size.

12. The method according to claim 10 or 11, characterized in that The resource pool includes a first SL PRS resource and a second SL PRS resource. If the comb tooth sizes allowed by the first SL PRS resource and the second SL PRS resource are different, the sixth parameter includes parameters corresponding to the first SL PRS resource and the second SL PRS resource respectively; The first SL PRS resource and the second SL PRS resource contain different numbers of symbols, or the first SL PRS resource and the second SL PRS resource have different starting symbols in a time slot of the resource pool.

13. The method according to any one of claims 1 to 12, characterized in that: If the resource pool is a first type of resource pool, the first configuration information includes a parameter indicating a time domain position allowed to be occupied by SL PRS resources within a time slot of the resource pool; or, If the resource pool is a second type of resource pool, one SL PRS in the resource pool occupies all time domain resources that can be used for SL PRS transmission in one time slot.

14. The method according to claim 13, wherein: The first type of resource pool is a resource pool that performs channel sensing based on first measurement information, and the second type of resource pool is a resource pool that performs channel sensing based on second measurement information; The first measurement information is measurement information of DMRS for PSCCH, and the second measurement information is measurement information of DMRS for PSSCH.

15. The method according to any one of claims 1 to 14, characterized in that The method further comprises: The terminal device performs resource selection / reselection for SL PRS resources in the resource pool according to the first configuration information.

16. The method according to claim 15, characterized in that If the bandwidth occupied by one SL PRS resource supported by the resource pool is less than or equal to the first bandwidth, the resource selection / reselection is further based on one or more of the following parameters: An eighth parameter is used to indicate the index of the first frequency domain unit of the SL PRS resource in the resource pool; and A ninth parameter is used to indicate the number of frequency domain units included in the SL PRS selected by the terminal device; The first bandwidth is the total bandwidth occupied by resource blocks in the resource pool that can be used for SL PRS transmission.

17. The method according to claim 16, characterized in that The ninth parameter is used to indicate the minimum value of the number of the frequency domain units.

18. The method according to any one of claims 1 to 17, characterized in that The resource pool includes one or more of the following resource pools: Occupy a resource pool of a sideways BWP; and and a shared resource pool between sideline communications.

19. A terminal device, characterized in that: include: The processing unit is configured to determine first configuration information, where the first configuration information is used to configure sidelink positioning reference signal SL PRS resources in a resource pool.

20. The terminal device according to claim 19, characterized in that The first configuration information includes one or more of the following: A first parameter is used to indicate the time domain position of the SL PRS resource allowed in a time slot of the resource pool; A second parameter is used to indicate the comb tooth size of the SL PRS resources in the resource pool; and The third parameter is used to indicate the frequency domain position of the SL PRS resources allowed in the resource pool.

21. The terminal device according to claim 20, characterized in that The first parameter includes one or more of the following: A fourth parameter is used to indicate the starting symbol allowed to be occupied by SL PRS resources in the one time slot; and The fifth parameter is used to indicate the number of symbols allowed to be occupied by SL PRS resources in the said time slot.

22. The terminal device according to claim 21, characterized in that The resource pool includes a first time slot and a second time slot, the time domain lengths of the first time slot and the second time slot are different, the first time slot corresponds to the first value of the fourth parameter, the second time slot corresponds to the second value of the fourth parameter, and the first value and the second value are different.

23. The terminal device according to claim 21 or 22, characterized in that: A plurality of the starting symbols are allowed in the one time slot, the plurality of the starting symbols include a first symbol and a second symbol that are adjacent in time domain position, and the SL PRS resource corresponding to the first symbol includes the first symbol and symbols between the first symbol and the second symbol in the time domain; or Multiple starting symbols are allowed in the time slot, the last starting symbol among the multiple starting symbols is the third symbol, the last symbol among the symbols that can be used for SL PRS transmission in the time slot is the fourth symbol, and the SL PRS resource corresponding to the third symbol occupies the third symbol, the fourth symbol, and the symbols between the third symbol and the fourth symbol in the time domain.

24. The terminal device according to claim 23, characterized in that The target symbol in the one time slot includes one or more of the following: A symbol for automatic gain control within the one time slot; Symbols used for transceiver conversion within the one time slot; and A symbol within the time slot used to indicate the side channel occupied by the SL PRS transmission; The target symbol is a symbol that can be used for SL PRS transmission in the one time slot or a symbol occupied by an SL PRS resource in the one time slot.

25. The terminal device according to any one of claims 21 to 24, characterized in that: The fifth parameter is used to indicate the minimum number of symbols allowed to be occupied by SL PRS resources in the time slot.

26. The terminal device according to any one of claims 20 to 25, characterized in that: One SL PRS resource in the resource pool occupies multiple consecutive symbols in the time domain.

27. The terminal device according to any one of claims 20 to 26, characterized in that: The comb tooth size of the SL PRS resources in the resource pool satisfies one or more of the following: The comb teeth sizes of the SL PRS resources in the resource pool are the same; SL PRS resources with different time domain starting positions in the resource pool correspond to different comb tooth sizes; SL PRS resources with different time domain lengths in the resource pool correspond to different comb tooth sizes; and The comb tooth size of the SL PRS resources in the resource pool is determined based on the number of symbols included in the SL PRS resources or the number of symbols included in the SL PRS resources that can be used to transmit the SL PRS.

28. The terminal device according to any one of claims 20 to 27, characterized in that: The third parameter includes one or more of the following: A sixth parameter is used to indicate the starting resource element RE index allowed to be occupied by SL PRS resources in the resource pool; and The seventh parameter is used to indicate the RE interval between adjacent SL PRS resources in the resource pool.

29. The terminal device according to claim 28, characterized in that The RE index indicated by the sixth parameter is any value within the value range corresponding to the comb tooth size.

30. The terminal device according to claim 28 or 29, characterized in that: The resource pool includes a first SL PRS resource and a second SL PRS resource. If the comb tooth sizes allowed by the first SL PRS resource and the second SL PRS resource are different, the sixth parameter includes parameters corresponding to the first SL PRS resource and the second SL PRS resource respectively; The first SL PRS resource and the second SL PRS resource contain different numbers of symbols, or the first SL PRS resource and the second SL PRS resource have different starting symbols in a time slot of the resource pool.

31. The terminal device according to any one of claims 19 to 30, characterized in that: If the resource pool is a first type of resource pool, the first configuration information includes a parameter indicating a time domain position allowed to be occupied by SL PRS resources within a time slot of the resource pool; or, If the resource pool is a second type of resource pool, one SL PRS in the resource pool occupies all time domain resources that can be used for SL PRS transmission in one time slot.

32. The terminal device according to claim 31, characterized in that: The first type of resource pool is a resource pool that performs channel sensing based on first measurement information, and the second type of resource pool is a resource pool that performs channel sensing based on second measurement information; The first measurement information is measurement information of DMRS for PSCCH, and the second measurement information is measurement information of DMRS for PSSCH.

33. The terminal device according to any one of claims 19 to 32, characterized in that: The terminal device further includes: The terminal device performs resource selection / reselection for SL PRS resources in the resource pool according to the first configuration information.

34. The terminal device according to claim 33, characterized in that If the bandwidth occupied by one SL PRS resource supported by the resource pool is less than or equal to the first bandwidth, the resource selection / reselection is further based on one or more of the following parameters: An eighth parameter is used to indicate the index of the first frequency domain unit of the SL PRS resource in the resource pool; and A ninth parameter is used to indicate the number of frequency domain units included in the SL PRS selected by the terminal device; The first bandwidth is the total bandwidth occupied by resource blocks in the resource pool that can be used for SL PRS transmission.

35. The terminal device according to claim 34, characterized in that The ninth parameter is used to indicate the minimum value of the number of the frequency domain units.

36. The terminal device according to any one of claims 19 to 35, characterized in that: The resource pool includes one or more of the following resource pools: Occupy a resource pool of a sideways BWP; and and a shared resource pool between sideline communications.

37. A terminal device, characterized in that: The terminal comprises a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send a signal, so that the terminal executes the method according to any one of claims 1 to 18.

38. A device, characterized in that The device comprises a processor configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 18.

39. A chip, characterized in that: The device comprises a processor configured to call a program from a memory so that a device equipped with the chip executes the method according to any one of claims 1 to 18.

40. A computer-readable storage medium, characterized in that A program is stored thereon, and the program causes a computer to execute the method according to any one of claims 1 to 18.

41. A computer program product, characterized in that The method comprises a program for causing a computer to execute the method according to any one of claims 1 to 18.

42. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 18.

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