Method for radio communication, and communication device

Abstract

Provided are a method for radio communication, and a communication device. The method for radio communication comprises: a first device determining a first resource configuration (S1910), wherein the first resource configuration is used for configuring an SLPRS resource in a resource pool.

Description

Method and communication device for wireless communication Technical Field

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

[0002] Some communication systems, such as new radio (NR) systems, hope to introduce sidelink-based positioning to enhance positioning technology. With the introduction of sidelink-based positioning, the resources used to send the sidelink positioning reference signal (SL PRS) may share a resource pool with other sidelink information resources. In this case, how to determine the SL PRS resources is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a method and a communication 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 first device determines a first resource configuration, where the first resource configuration is used to configure SL PRS resources in a resource pool.

[0006] In a second aspect, a communication device is provided. The communication device is a first device, and the communication device includes: a determination module, which determines a first resource configuration, and the first resource configuration is used to configure SL PRS resources in a resource pool.

[0007] In a third aspect, a communication 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 communication device executes some 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 communication device. In another possible design, the system may also include other devices that interact with the communication 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 to execute part 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 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 a seventh aspect, an embodiment of the present application provides a computer program, which is operable to enable a communication device to execute part or all of the steps in the methods of the above aspects.

[0012] In an eighth aspect, an embodiment of the present application provides a chip comprising a memory and a processor, wherein 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.

[0013] In an embodiment of the present application, the first device can determine the relevant configuration (i.e., the first resource configuration) for configuring the SL PRS resources in the resource pool, which is conducive to the first device selecting appropriate SL PRS resources from the resource pool according to the first resource configuration to transmit and receive SL PRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] FIG2 is a diagram showing an example of a sideline communication scenario within network coverage.

[0016] FIG3 is an example diagram of a side communication scenario with partial network coverage.

[0017] FIG4 is a diagram showing an example of a side communication scenario outside network coverage.

[0018] FIG5 is a diagram showing an example of a side communication scenario based on a central control node.

[0019] FIG6 is a diagram illustrating an example of a broadcast-based sideline communication method.

[0020] FIG. 7 is an exemplary diagram of a sideline communication method based on unicast.

[0021] FIG8 is an example diagram of a sideline communication method based on multicast.

[0022] FIG9 is a diagram showing an example of a time slot structure of a sideline communication system.

[0023] FIG10 is a diagram showing an example of the structure of the second-order SCI in a time slot.

[0024] FIG11 is an example diagram of the time domain positions of PSCCH DMRS symbols within a time slot.

[0025] FIG12 is an example diagram of single-symbol DMRS frequency domain type 1. FIG.

[0026] FIG13 is an example diagram of PSCCH and PSSCH resource pools.

[0027] FIG14 is a schematic diagram of the structure of time slots in the NR system.

[0028] FIG. 15 is a diagram illustrating an example of resources for transmitting a DL PRS.

[0029] FIG16 is a schematic diagram of the structure of an interleaved resource block.

[0030] FIG17 is a diagram showing an example of a frame structure of the SL-U system.

[0031] FIG18 is a diagram showing an example of an RB set.

[0032] FIG19 is a flow chart of a method for wireless communication provided in accordance with an embodiment of the present application.

[0033] FIG20 is a schematic diagram of the structure of a time slot provided in an embodiment of the present application.

[0034] FIG21 is a schematic diagram of the structure of a time slot provided in another embodiment of the present application.

[0035] FIG22 is a schematic diagram of the structure of a time slot provided in another embodiment of the present application.

[0036] FIG23 is a flow chart of a method for wireless communication provided in another embodiment of the present application.

[0037] Figure 24 is a structural diagram of the communication device provided in an embodiment of the present application.

[0038] Figure 25 is a structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solution in this application will be described below with reference to the accompanying drawings.

[0040] Communication system architecture

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The terminal device in the embodiments 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, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to 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 embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0046] 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 can 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, transmission point (TRP), transmission 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 can 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 can also refer to a communication module, a modem or a chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and 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. The base station can 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 the network equipment.

[0047] 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.

[0048] 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 includes a CU and a DU. The gNB may also include an AAU.

[0049] 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 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.

[0050] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0051] Sideline communication under different network coverage conditions

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Figure 3 is an example diagram of a sidelink communication scenario 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.

[0056] 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.

[0057] Sideline communication based on central control node

[0058] 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.

[0059] Data transmission method of side communication

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] NR-V2X time slot structure

[0065] The NR-V2X system has lower latency than the LTE-V2X system. Therefore, the multiplexing method of the physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) of the NR-V2X system has been redesigned compared to the LTE-V2X system. The time domain resource allocation of NR-V2X is based on time slots. Within a time slot, the first orthogonal frequency division multiplexing (OFDM) symbol is fixed for automatic gain control (AGC). On the AGC symbol, the UE can copy the information sent on the second symbol. At the end of the time slot, a symbol is reserved for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state.

[0066] In the NR-V2X system, PSSCH and its associated PSCCH are transmitted in the same time slot. Except for the AGC symbol, PSCCH can occupy 2 or 3 OFDM symbols, and the PSCCH time domain position can start from the second time domain symbol among the time domain symbols available for sideline transmission in the time slot (the first time domain symbol is the AGC symbol).

[0067] The number of PRBs occupied by the PSCCH in the frequency domain is configurable. For example, the PSCCH can occupy {10, 12, 15, 20, 25} physical resource blocks (PRBs) in the frequency domain. In the frequency domain, the number of PRBs occupied by the PSCCH is within the range of a PSSCH subband. If the number of PRBs occupied by the PSCCH is less than the size of a PSSCH subchannel, or the PSSCH frequency domain resources include multiple subchannels, the PSCCH can be frequency-division multiplexed with the PSSCH in the OFDM symbol where the PSCCH resides.

[0068] In the NR-V2X system, the parameters sl-startSLsymbols and sl-lengthSLsymbols can be used to configure the start and length of the time domain symbols (abbreviated as symbols) used for sidelink transmission in a time slot. The last symbol of the symbols used for sidelink transmission in a time slot configured by the parameters sl-startSLsymbols and sl-lengthSLsymbols is used as the guard period (GP). PSSCH and PSCCH can only use the remaining time domain symbols.

[0069] In some embodiments, in addition to PSCCH and PSSCH, a physical sidelink feedback channel (PSFCH) may also exist in a sidelink timeslot in NR-V2X. If PSFCH transmission resources are configured in a timeslot, PSSCH and PSCCH cannot occupy the symbol used for PSFCH transmission, as well as the AGC and GP symbols preceding that symbol.

[0070] Figure 9 shows an example diagram of the time slot structure of some sideline communication systems (such as NR-V2X systems). As shown in Figure 9, the network configuration parameters sl-StartSymbol=3, sl-LengthSymbols=11, that is, the 11 symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in this time slot. The PSFCH occupies symbols 11 and 12, where symbol 11 is used as the AGC symbol of the PSFCH, and symbols 10 and 13 are used as GPs respectively. Therefore, the symbols that can be used for PSSCH transmission are symbols 3 to 9, where the PSCCH occupies 3 time domain symbols, that is, the PSCCH occupies symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0071] PSSCH can be used to carry second-order sidelink control information (SCI) and sidelink shared channel (SL-SCH). The second-order SCI may include different SCI formats. For example, two second-order SCI formats are defined in 3GPP R16, namely SCI format 2-A and SCI format 2-B. SCI format 2-B is applicable to multicast communication modes that perform sidelink hybrid automatic repeat request (HARQ) feedback based on distance information; SCI format 2-A is applicable to other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication modes that require sidelink HARQ feedback, and multicast communication modes that require feedback of positive acknowledgment (ACK) or negative acknowledgment (NACK). In 3GPP R17, an additional second-order SCI format, namely SCI format 2-C, is introduced to indicate reference resource sets and trigger signaling in specific circumstances.

[0072] Figure 10 shows an example of the second-order SCI structure in a time slot. As shown in Figure 10, the modulation symbols of the second-order SCI are mapped starting from the symbol containing the first PSSCH modulation and demodulation reference signal, first in the frequency domain and then in the time domain. This symbol is then interleaved and multiplexed with the resource elements (REs) of the demodulation reference signal (DMRS). Furthermore, the modulation symbols of the second-order SCI cannot be mapped to the REs containing the phase tracking reference signal (PT-RS).

[0073] In the sidewalk communication system, the UE's autonomous resource selection or the determination of transmission resources based on the network's sidewalk resource scheduling may cause different UEs to send PSCCH on the same time-frequency resources. In order to ensure that the receiver can detect at least one PSCCH in the event of a PSCCH resource conflict, LTE-V2X adopts a PSCCH DMRS randomization design scheme. Specifically, when sending PSCCH, the UE can randomly select a value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple UEs use different cyclic shifts to send PSCCH DMRS on the same time-frequency resources, the receiving UE can still detect at least one PSCCH through the orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCC) for the transmitting UE to randomly select, as shown in Table 1, where the i-th bit of the OCC mask is applied to the i-th DMRS RE in the resource block (RB), thereby achieving the effect of distinguishing different UEs.

[0074] Table 1

[0075] The DMRS of PSSCH in some sideline communication systems (such as NR-V2X systems) draws on the design of the NR Uu interface and adopts multiple time-domain PSSCH DMRS patterns. In a resource pool, the number of DMRS patterns that can be used is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and the number of PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol in the pattern are shown in Table 2. Figure 11 shows a schematic diagram of the time domain position of 4 DMRS symbols in a time slot when the PSSCH has 13 symbols.

[0076] Table 2

[0077] In some embodiments, if multiple time-domain DMRS patterns are configured within a resource pool, the specific time-domain DMRS pattern to be used can be selected by the transmitting UE and indicated in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring channel estimation accuracy; while for low-speed UEs, a low-density DMRS pattern can be used, thereby improving spectrum efficiency.

[0078] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, p i The i-th cyclic redundancy check (CRC) bit of the PSCCH that schedules the PSSCH is L, which is the number of bits of the PSCCH CRC, for example, L=24.

[0079] In the NR communication system, two frequency domain DMRS patterns are supported in PDSCH and PUSCH, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, and single-symbol DMRS frequency domain type 2 can support 6 DMRS ports. In the case of double DMRS symbols, the number of supported ports is doubled. However, in sideline communication systems (such as NR-V2X), since PSSCH only needs to support two DMRS ports at most, only single-symbol DMRS frequency domain type 1 can be supported. Figure 12 is an example diagram of a single-symbol DMRS frequency domain type 1.

[0080] Determination of NR-V2X frequency domain resources

[0081] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool can be contiguous, and the frequency domain resource allocation granularity can be subchannels. Typically, a subchannel includes a number of PRBs {10, 12, 15, 20, 50, 75, 100}, with the smallest subchannel size being 10 PRBs, significantly larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is primarily because the frequency domain resources of the PSCCH in NR-V2X are located within the first subchannel of its associated PSSCH. The PSCCH frequency domain resources are less than or equal to the size of a single PSSCH subchannel, while the PSCCH time domain resources occupy two or three OFDM symbols. If the subchannel size is configured too small, the available PSCCH resources are limited, increasing the bit error rate and degrading PSCCH detection performance. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but typically the PSCCH frequency domain resources are less than or equal to the PSSCH subchannel size.

[0082] In some implementations, the following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools: subchannel size (sl-SubchannelSize), number of subchannels (sl-NumSubchannel), subchannel start RB index (sl-StartRB-Subchannel), number of PRBs (sl-RB-Number), and PSCCH frequency domain resource indication (sl-FreqResourcePSCCH).

[0083] The above subchannel size may indicate the number of consecutive PRBs included in a subchannel in the resource pool, and the value range may be {10, 12, 15, 20, 50, 75, 100} PRBs.

[0084] The above-mentioned number of sub-channels may indicate the number of sub-channels included in the resource pool.

[0085] The above sub-channel starting RB index may indicate the starting PRB index of the first sub-channel in the resource pool.

[0086] The above-mentioned PRB number may indicate the number of consecutive PRBs included in the resource pool.

[0087] The above-mentioned PSCCH frequency domain resource indication may indicate the frequency domain resource size of the PSCCH, and generally, the value range is {10, 12, 15, 20, 25} PRB.

[0088] In some implementations, when a terminal device determines a resource pool for PSSCH transmission or PSSCH reception, the frequency domain resources included in the resource pool may be sl-NumSubchannel consecutive subchannels starting with the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs included in the sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0089] In NR-V2X, the frequency domain starting position of the first subchannel of PSCCH and its associated PSSCH can be aligned. Therefore, the starting position of each PSSCH subchannel is the possible frequency domain starting position of PSCCH. The frequency domain range of the resource pool of PSCCH and PSSCH can be determined according to the above parameters. Figure 13 shows a schematic diagram of the PSCCH and PSSCH resource pool.

[0090] Typically, the PSCCH is used to carry sidelink control information related to resource sensing. In some implementations, the information carried by the PSCCH may include one or more of the following: priority of the scheduled transmission, frequency domain resource allocation, time domain resource allocation, PSSCH reference signal pattern, second-order SCI format, second-order SCI rate offset, number of PSSCH DMRS ports, modulation and coding scheme (MCS), MCS table indication, number of PSFCH symbols, resource reservation period, reserved bits, etc.

[0091] The frequency domain resource allocation is used to indicate the number of frequency domain resources of the PSSCH in the current time slot scheduled by the PSCCH, and the number and starting position of the frequency domain resources of a maximum of two retransmission resources reserved.

[0092] The time domain resource allocation is used to indicate the time domain positions of at most two retransmission resources.

[0093] The resource reservation period is used to reserve resources for another transport block (TB) to be sent in the next period. Generally, when inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0094] Reserved bits, usually 2 to 4 bits. The specific number of bits can be configured or pre-configured by the network.

[0095] Since the PSCCH and the scheduled PSSCH are sent in the same time slot, and the starting position of the PRB occupied by the PSCCH can be the starting position of the first subchannel of the scheduled PSSCH, the above-mentioned PSCCH (i.e., SCI format 1-A) does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0096] Determination of NR-V2X time domain resources (time slots)

[0097] In NR-V2X, PSCCH / PSSCH transmission is usually based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot, and time-division multiplexing (TDM) is not supported for transmitting multiple PSCCH / PSSCH in one time slot. In addition, PSCCH / PSSCH between different users can be multiplexed in one time slot through frequency division multiplexing (FDM).

[0098] In NR-V2X, the time domain resources of PSSCH can be based on time slots. However, unlike LTE-V2X, where PSSCH occupies all time domain symbols in a subframe, PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmissions are also based on subframe granularity, so sidelink transmissions are also based on subframe granularity (special subframes in the TDD system are not used for sidelink transmissions). In the NR system, a flexible time slot structure is used, that is, a time slot includes both uplink and downlink symbols, which can achieve more flexible scheduling and reduce latency.

[0099] Figure 14 shows a schematic diagram of the timeslot structure in an NR system. As shown in Figure 14 , a timeslot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols can be located at the beginning of a timeslot, and uplink symbols can be located at the end of a timeslot. Flexible symbols are located between downlink and uplink symbols. Furthermore, the number of various symbols in each timeslot is configurable.

[0100] Currently, sidelink transmission systems can share carriers with cellular systems. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact both uplink and downlink data transmission in the NR system and reduce system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, meaning that a portion of the uplink symbols in a timeslot are used for sidelink transmission. Furthermore, considering that sidelink transmission includes AGC and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing these symbols leaves even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0101] In NR-V2X, the starting point and length of the time domain symbol used for sideline transmission in a time slot can be configured through the parameters starting symbol position (sl-StartSymbol) and number of symbols (sl-LengthSymbols). The last symbol in the time domain symbol used for sideline transmission is used as the guard interval GP. PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbol used for PSFCH transmission, as well as the AGC and GP symbols before the symbol.

[0102] In the NR-V2X system, the time domain resources of the resource pool are indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within a system frame number (SFN) period is the same as in LTE-V2X, with the following two differences.

[0103] First, the total number of time slots included in one SFN cycle is 10240×2 μ , where the parameter μ is related to the subcarrier spacing.

[0104] Second, if at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not configured as an uplink symbol by the network device's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0105] The method of determining the time slot position belonging to the resource pool within an SFN cycle may include the following steps 1 to 5.

[0106] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle. The time slots that do not belong to the resource pool may include synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0107] Among them, N S_SSB Indicates the number of synchronization time slots in an SFN cycle. The synchronization time slot is determined according to the synchronization-related configuration parameters and is related to the period of transmitting the synchronization signal block (SSB) and the number of transmission resources of the SSB configured in the period.

[0108] N nonSL Indicates the number of time slots within an SFN cycle that do not conform to the uplink symbol start and number configurations. If at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0109] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0110] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. In some implementations, if a time slot l r (0≤r<10240×2 μ -N S_SSB -N nonSL )satisfy Then the time slot is a reserved time slot.

[0111] Among them, N resrved =(10240×2 μ -N S_SSB -N nonSL )mod Lbitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0112] Step 3: Remove the reserved time slots from the remaining time slot set, and the remaining time slot set is represented as a logical time slot set.

[0113] The time slots in the above time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0114] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0115] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set When b is satisfied k′ =1, the time slot belongs to the resource pool, where k′=k mod L bitmap .

[0116] Step 5: renumber the time slots belonging to the resource pool determined in step 4 into Among them, T′ max Indicates the number of time slots included in the resource pool.

[0117] Downlink-based positioning

[0118] In downlink positioning, the downlink positioning reference signal (DL PRS) parameter configuration can include four layers: the positioning frequency layer, the TRP layer, the PRS resource set, and the PRS resource. The following describes the DL PRS parameter configuration in detail.

[0119] The network device can provide the terminal device with 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".

[0120] The value of the frequency domain resource bandwidth of the DL PRS may be the number of 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.

[0121] 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.

[0122] 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.

[0123] In some scenarios, the parameters of the TRP layer may include an ID parameter for uniquely identifying and locating 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.

[0124] For each DL PRS resource set, the configuration parameters of the DL PRS resource set can be applied to all DL PRS resources contained in this DL PRS resource set. The configuration parameters of a DL PRS resource set include one or more of the following parameters: DL PRS resource set identification ID (expressed by "nr-DL-PRS-ResourceSetID"); DL PRS transmission period and time slot offset (expressed by "dl-PRS-Periodicity-and-ResourceSetSlotOffset"); DL PRS resource repetition factor (expressed by "dl-PRS-ResourceRepetitionFactor"); DL PRS resource repeated transmission time interval (expressed by "dl-PRS-ResourceTimeGap"); DL PRS muting configuration; and the number of OFDM symbols occupied by DL PRS resources (expressed by "dl-PRS-NumSymbols").

[0125] The transmission period and time slot offset of the above-mentioned DL PRS 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 range of configurable DL PRS transmission period values ​​can be the same. Figure 15 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.

[0126] 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 DL PRS. 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.

[0127] 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.

[0128] 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 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.

[0129] The number of OFDM symbols occupied by the DL PRS resource is used to indicate the number of OFDM symbols allocated to one DL PRS resource within one time slot.

[0130] 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.

[0131] 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").

[0132] 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.

[0133] 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.

[0134] 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.

[0135] The QCL information of the DL PRS is used to indicate the QCL information of the DL PRS.

[0136] Sidelink over unlicensed spectrum (SL-U)

[0137] When performing sidelink transmission on unlicensed spectrum, sidelink transmission needs to meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, when the UE uses the channel for data transmission, the occupied channel bandwidth must be no less than 80% of the channel bandwidth; for maximum power spectral density requirements, the power transmitted by the UE per 1MHz cannot exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmission on unlicensed spectrum needs to adopt an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, and a total of M IRBs are included in the frequency band. The RBs included in the mth IRB are {m, M+m, 2M+m, 3M+m, ...}.

[0138] Figure 16 shows a schematic diagram of the interleaved resource block structure. As shown in Figure 16, the system bandwidth includes 20 RBs, including 5 IRBs (i.e., M = 5), each IRB includes 4 RBs (i.e., N = 4), and the frequency domain interval between two adjacent RBs in the same IRB is the same, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB index.

[0139] In the SL-U system, if IRB-based resource allocation granularity is adopted, channels such as the PSCCH and PSSCH in the SL-U system should all be based on the IRB structure. Figure 17 shows an example of the frame structure of the SL-U system. The example frame structure in Figure 17 is an example of a frame structure in which only the PSCCH and PSSCH are included in the time slot, excluding the PSFCH. As shown in Figure 17, the bandwidth includes 20 RBs, and 5 IRB resources are configured, i.e., M = 5. Each IRB resource includes 4 RBs, and the numbers in the boxes represent the IRB index. In Figure 17, the system configures the PSCCH to occupy 1 IRB resource and occupies 2 OFDM symbols in the time domain. The PSSCH uses IRB granularity, with the first symbol in the time slot being an AGC symbol and the last symbol being a GP symbol. In Figure 17, PSSCH 1 occupies IRB #0 and IRB #1, with its corresponding PSCCH 1 occupying IRB #0. PSSCH 2 occupies IRB #2, with its corresponding PSCCH 2 also occupying IRB #2. It should be noted that, for simplicity, FIG17 does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0140] In unlicensed spectrum, UEs can access channels using listen-before-talk (LBT). LBT uses a 20MHz granularity in the frequency domain, with each 20MHz interval being called an RB Set. A carrier can contain multiple RB Sets, separated by guard intervals, as shown in Figure 18.

[0141] In unlicensed spectrum, UEs must first perform LBT before they can access the channel. However, the time it takes for the UE to complete LBT is uncertain. In some implementations, if a UE is restricted to transmitting only from the start of a timeslot, it may miss a transmission opportunity due to failure to complete LBT before that time. Therefore, SL-U considers adding a transmission starting point within a timeslot, i.e., multi-starting point transmission. For example, the additional starting point can be the third or fourth OFDM symbol in the timeslot.

[0142] Sidelink-based positioning

[0143] In 3GPP R-17, 3GPP RAN conducted studies on sidelink-based positioning, for example, on "NR positioning enhancement" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage and out of coverage". Among them, the study on "scenarios and requirements for NR positioning use cases in coverage, partial coverage and out of coverage" focused on V2X and public safety use cases. In addition, some organizations (such as the 3GPP SA1 working group) have also developed requirements for "ranging-based services" and positioning accuracy requirements for IoT use cases in out-of-coverage scenarios. 3GPP needs to study and develop sidelink-based positioning solutions to support the use cases, scenarios and requirements identified in these activities.

[0144] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies of positioning technology based on sidestream positioning reference signals in the early stages of Release 18. Next, 3GPP will standardize solutions for sidestream positioning (including ranging and direction finding) in NR systems. This sidestream positioning solution primarily includes the following standardization work.

[0145] Standardization Work 1: Standardization of the Sidelink Positioning Reference Signal (SL PRS). The SL PRS can use a frequency-domain structure based on a comb pattern (including full RE mapping mode) and a pseudo-random sequence format. The SL PRS can be designed based on the existing DL-PRS sequence and support a maximum SL PRS bandwidth of 100 MHz in FR1.

[0146] Standardization work 2: Standardize the measurement quantities used for side-by-side positioning. For example, standardize the measurement quantities used to support SL RTT, SL-AOA, and SL-TDOA positioning methods.

[0147] Standardization work three: Standardize the resource allocation scheme of SL PRS. For example, the resource allocation scheme of SL PRS includes resource allocation scheme 1 and scheme 2, where scheme 1 corresponds to the network allocating SL PRS resources, and scheme 2 corresponds to the UE autonomously selecting SL PRS resources. In some implementations, the system supports SL PRS and Rel-16 / 17 / 18 sideline communication shared resource pool and SL PRS dedicated resource pool. In some implementations, for scheme 2, it is necessary to study and standardize one or more of the following: resource selection based on channel sensing, random resource selection, congestion control, and resource selection based on UE coordination.

[0148] Standardization work 4: Standardize the open-loop power control mechanism of SL PRS transmission, etc.

[0149] As mentioned above, after the introduction of sidelink-based positioning, the communication system may support SL PRS resources and other sidelink information resources sharing resource pool. In this case, how the terminal device and positioning-related entities (such as the positioning server) determine the SL PRS resources is a problem that needs to be solved.

[0150] In response to the above problems, an embodiment of the present application provides a method and communication device for wireless communication, wherein the first device can determine the relevant configuration for configuring the SL PRS resources in the resource pool (i.e., the first resource configuration mentioned below), which is beneficial for the first device to select appropriate SL PRS resources from the resource pool according to the first resource configuration to transmit and receive SL PRS.

[0151] In some embodiments, the resource pool includes a shared resource pool for sideline communications. The shared resource pool for sideline communications can be understood as a resource pool that includes SL PRS resources and resources for transmitting other sideline information (e.g., sideline channels and / or sideline data) in addition to the SL PRS. For example, the resource pool may include SL PRS resources and PSSCH resources.

[0152] In some embodiments, the resource pool may be a frequency-division multiplexing resource pool. In this case, transmitting the SL PRS on other frequency-domain resources in the resource pool may affect the reception of sidelink information transmitted on other frequency-domain resources. Therefore, in some embodiments, the resource pool used for SL PRS transmission may occupy the entire sidelink bandwidth part (BWP). In other words, the resource pool may include a resource pool that occupies one sidelink BWP.

[0153] This application does not limit the application scenarios of this technical solution. In some embodiments, the technical solution of this application can be applied to scenarios using licensed spectrum. In some embodiments, the technical solution of this application can be applied to scenarios using unlicensed spectrum.

[0154] For ease of understanding, the following is a brief introduction to SL PRS resources.

[0155] In the embodiment of the present application, the SL PRS resource can be understood as a time-frequency resource for sending SL PRS within a time domain unit, or in other words, the SL PRS resource refers to a time-frequency resource for sending SL PRS within a time domain unit. The embodiment of the present application does not specifically limit the time domain unit. For example, the time domain unit can be any time domain unit in a known communication system, such as a frame, a subframe, a time slot, a symbol, etc. Alternatively, the time domain unit can also be any time domain unit introduced in a future communication system, and the embodiment of the present application does not limit this. Taking the time domain unit as a time slot as an example, the SL PRS resource can refer to the time-frequency resource for sending SL PRS within a time slot.

[0156] A SL PRS resource can be indicated by one or more parameters, or in other words, a SL PRS resource can include one or more characteristics. For example, a SL PRS resource can include one or more of the following characteristics: SL PRS resource ID, comb tooth size and RE offset of the SL PRS sent within the SL PRS resource, the starting position of the SL PRS resource within a time domain unit and the number of occupied time domain resources, and the frequency domain position of the SL PRS resource.

[0157] Taking the time domain unit as a time slot as an example, an SL PRS resource can include at least the following characteristics: SL PRS resource ID, the comb tooth size and RE offset of the SL PRS sent in the SL PRS resource, the starting OFDM symbol of the SL PRS resource in the time slot and the number of continuous OFDM symbols occupied, and the frequency domain position of the SL PRS resource.

[0158] The following describes the method for wireless communication provided by an embodiment of the present application in conjunction with Figure 19. Figure 19 is a flow chart of the method for wireless communication provided by an embodiment of the present application. The method shown in Figure 19 can be executed by a first device. The embodiment of the present application does not specifically limit the first device, and the first device can be any device related to side positioning. In some embodiments, the first device can be a terminal device that sends SL PRS or receives SL PRS, or in other words, the first device can be a sending terminal of SL PRS or a receiving terminal of SL PRS. In some embodiments, the first device can be other entities related to side positioning, for example, the first device can be a positioning server or a service terminal device (server UE), etc.

[0159] In an embodiment of the present application, a positioning server can be used to determine the location information of a terminal device. The positioning server can be located in the core network. In some embodiments, the positioning server can also be referred to as a positioning device, a positioning device in the core network, etc. Taking the NR system as an example, the positioning server can be a location management function (LMF). Taking other communication systems as an example, the positioning server can be a location management unit (LMU), a location management center (LMC) or an evolved serving mobile location center (E-SMLC). It can be understood that the positioning server can also be other network elements, nodes or devices for determining the location information of a terminal device, such as a network element or node for determining the location information of a terminal device in a future communication system. The embodiment of the present application does not specifically limit the name of the positioning server.

[0160] In the embodiment of the present application, the service terminal device can be used to determine the location information of the terminal device. In other words, the function of the service terminal device is the same as that of the positioning server, and the service terminal device can implement part or all of the functions of the positioning server.

[0161] The method shown in Figure 19 may include step S1910. In step S1910, the first device determines a first resource configuration.

[0162] In the embodiment of the present application, the first resource configuration can be used to configure the SL PRS resources in the resource pool. In some embodiments, the first resource configuration can also be understood or replaced by other terms such as first resource configuration information, first configuration information, etc., and the embodiment of the present application is not limited to this.

[0163] In some embodiments, the resource pool can be the shared resource pool described above, that is, the resources in the resource pool can be shared by SL PRS and other side information (for example, PSSCH) other than SL PRS; in other words, the resource pool includes SL PRS resources and resources for sending other side information other than SL PRS resources.

[0164] In some embodiments, the SL PRS resources in the resource pool may be configured or pre-configured by a network device. In some embodiments, the SL PRS resources in the resource pool may be determined by a transmitting terminal of the SL PRS and / or a receiving terminal of the SL PRS.

[0165] In some embodiments, the first resource configuration may be determined based on configuration information of a resource pool. The configuration information of the resource pool may be configured or preconfigured by a network device. For example, when the SL PRS resources in the resource pool are configured or preconfigured by a network device, the first resource configuration may be determined based on configuration information of the resource pool configured or preconfigured by the network device.

[0166] That is to say, the SL PRS resources in the resource pool can be configured or pre-configured by the network device, so that the SL PRS sending terminal and / or the SL PRS receiving terminal can determine the configuration of the SL PRS resources in the resource pool through the configuration / pre-configuration signaling of the resource pool. For example, the SL PRS resources contained in a time slot in the resource pool used for SL PRS transmission are configured or pre-configured by the network device, so that the SL PRS sending terminal and / or the SL PRS receiving terminal can determine the SL PRS resource configuration in a time slot in the resource pool through the configuration / pre-configuration signaling of the resource pool. This resource configuration method can reduce the high-level signaling interaction between the SL PRS sending terminal and the SL PRS receiving terminal, saving resources.

[0167] In some embodiments, the first resource configuration may be determined based on positioning requirement information, for example, based on positioning requirement information of a terminal device. For example, the transmitting terminal of the SL PRS and the receiving terminal of the SL PRS may determine the SL PRS resource configuration in the resource pool through high-layer signaling (for example, RRC layer signaling, SLPP layer signaling, etc.). Taking the time domain unit as a time slot as an example, the transmitting terminal of the SL PRS and the receiving terminal of the SL PRS may determine the SL PRS resource configuration in a time slot in the resource pool through high-layer signaling. This resource configuration method can enable the relevant entities of side positioning (such as the transmitting terminal, the receiving terminal, the positioning server, the service terminal device, etc.) to autonomously configure the SL PRS resources, thereby better meeting the needs of positioning services, such as meeting the quality of service (QoS) requirements of positioning services.

[0168] As an example, the SL PRS resource configuration within the resource pool (such as the SL PRS resource configuration in a time slot within the resource pool) can be determined by the SL PRS transmitting terminal, and the transmitting terminal notifies the SL PRS receiving terminal through high-layer signaling (such as RRC layer signaling, SLPP layer signaling, etc.). In addition, the SL PRS transmitting terminal and / or the SL PRS receiving terminal can report the determined SL PRS resource configuration to the positioning server or the service terminal device, so that the positioning server or the service terminal device can determine the SL PRS resource through the reported SL PRS resource configuration (for example, according to the SL PRS resource ID carried in the resource configuration).

[0169] As another example, the SL PRS resource configuration within the resource pool (such as the SL PRS resource configuration in a time slot within the resource pool) can be determined by the positioning server or the service terminal device, and sent by the positioning server or the service terminal device to the SL PRS sending terminal and / or the SL PRS receiving terminal through SLPP layer signaling.

[0170] In some embodiments, in the absence of configuration information of a network device configured or pre-configured resource pool, the first resource configuration may be determined based on the positioning requirement information. That is, if there is no network device configured or pre-configured SL PRS resource in the resource pool for SL PRS transmission, the first device may determine the first resource configuration based on the positioning requirement information of the terminal device.

[0171] In some embodiments, the first resource configuration may be determined based on the identification information of the SL PRS resource. For example, the first resource configuration may be determined based on the SL PRS resource ID. As an example, there is (or has) an association relationship between the identification information of the SL PRS resource and the first resource configuration, and the first resource configuration may be determined based on the association relationship between the two. How to determine the first resource configuration based on the identification information of the SL PRS resource will be described in detail later. For the sake of brevity, it will not be described in detail here.

[0172] In an embodiment of the present application, the first device can determine a first resource configuration for configuring SL PRS resources in the resource pool, which is beneficial for the first device to select appropriate SL PRS resources from the resource pool according to the first resource configuration to transmit and receive SL PRS.

[0173] The first resource configuration may be used for multiple parameters (features) of the SL PRS resource, or in other words, the first resource configuration may include multiple parameters related to the SL PRS resource. The parameters included in the first resource configuration are exemplarily introduced below.

[0174] In some embodiments, the first resource configuration may include one or more of the following parameters: configuration parameters related to determining the time domain starting position of the SL PRS resource, configuration parameters related to indicating the identifier of the SL PRS resource, parameters used to indicate the comb tooth size of the SL PRS sent within the SL resource, parameters used to indicate the frequency domain position offset of the SL PRS sent within the SL PRS resource, parameters used to indicate the number of time domain resources occupied by the SL PRS resource, etc.

[0175] The configuration parameters related to determining the time domain starting position of the SL PRS resource may include various ones, as long as the parameters can be used to determine the time domain starting position of the SL PRS resource. The following provides examples of configuration parameters related to determining the time domain starting position of the SL PRS resource.

[0176] In some embodiments, the configuration parameters related to determining the time domain starting position of the SL PRS resource may include parameters indicating the time domain starting position (or starting time domain position) of the SL PRS resource, that is, a parameter may be used to directly indicate the time domain starting position of the SL PRS resource. As an example, the parameter can be used to indicate the starting OFDM symbol of the SL PRS resource. However, the embodiments of the present application are not limited to this, and the time domain starting position of the SL PRS resource may be indicated by other time domain resources (or time domain units) other than OFDM symbols, such as time slots, time domain resources in future communication systems, etc.

[0177] In some embodiments, the configuration parameters related to determining the time domain starting position of the SL PRS resource may include a parameter indicating the first time domain resource that can be used for the SL PRS resource within a time domain unit, that is, a parameter can be used to indicate the possible time domain starting position of the SL PRS resource, and the SL PRS resource can use the possible time domain starting position as the time domain starting position of the SL PRS resource, or a certain time domain resource after the possible time domain starting position as the time domain starting position of the SL PRS resource. As an example, the parameter can be used to indicate the first OFDM symbol that can be used for the SL PRS resource in a time slot. However, the embodiments of the present application are not limited to this, and the possible time domain starting position of the SL PRS resource can be indicated by other time domain resources other than OFDM symbols, such as time slots, time domain resources in future communication systems, etc.

[0178] In some embodiments, the parameter used to indicate the possible time domain starting position of the SL PRS resource (such as the parameter indicating the first time domain resource that can be used for the SL PRS resource within a time domain unit) can be a parameter that indicates the possible time domain starting position of the SL PRS resource using the index of the time domain resource (such as the OFDM symbol index). For example, the parameter can be used to indicate the first OFDM symbol index that can be used for the SL PRS resource within a time slot.

[0179] In some embodiments, the index of the time domain resource mentioned in the embodiments of the present application is relative to the first time domain resource that can be used for sidewalking configured or preconfigured on the SL BWP, and the index of the first time domain resource that can be used for sidewalking configured or preconfigured on the SL BWP is 0. For example, the OFDM symbol index mentioned in the embodiments of the present application is relative to the first OFDM symbol that can be used for sidewalking configured or preconfigured on the SL BWP, and the index of the first OFDM symbol that can be used for sidewalking configured or preconfigured on the SL BWP is 0.

[0180] In addition to the parameters listed above, the configuration parameters related to determining the time domain starting position of the SL PRS resource may also include other parameters, which are not limited in the embodiments of the present application. For example, the configuration parameters related to determining the time domain starting position of the SL PRS resource may include a parameter indicating the last time domain resource that can be used for the SL PRS resource in a time domain unit or a parameter indicating a certain time domain resource in the middle that can be used for the SL PRS resource in a time domain unit. In this case, the first device can use this parameter and other parameters to jointly determine the time domain starting position of the SL PRS resource. Taking the example that the configuration parameters related to determining the time domain starting position of the SL PRS resource include a parameter indicating the last time domain resource that can be used for the SL PRS resource in a time domain unit, the first device can use this parameter and a parameter for indicating the number of time domain resources occupied by the SL PRS resource to determine the time domain starting position of the SL PRS resource.

[0181] The configuration parameters related to the identification of the SL PRS resource may include multiple ones, which are not limited in the embodiments of the present application. For example, the parameter may include a parameter for indicating the identification of the SL PRS resource, and / or the parameter may include a parameter for indicating the identification starting point of the SL PRS resource.

[0182] As an example, the first resource configuration may include a parameter for indicating an identifier of the SL PRS resource, such as the first resource configuration including a SL PRS resource ID. In this way, a SL PRS resource can be uniquely identified within a time domain unit (such as a time slot) of the resource pool according to the SL PRS resource ID.

[0183] As another example, the first resource configuration may include a parameter for indicating the identification starting point of the SL PRS resource, such as the first resource configuration includes the SL PRS resource ID starting point. In this way, the SL PRS resource ID starting points corresponding to multiple SL PRS resources can be determined in a time domain unit (such as a time slot) of the resource pool according to the SL PRS resource ID starting point. For example, the first resource configuration includes the SL PRS resource ID starting point A and the comb tooth size N of the SL PRS sent in the SL PRS resource. For any of the above configurations, N SL PRS resources with different RE offsets can be determined, and the SL PRS resource IDs of the N different RE offsets are A, A+1,...,A+N-1 respectively. As a specific example, assuming that the SL PRS resource ID starting point indicated in the first resource configuration is 0 and N=4, then under this configuration, the first device can determine 4 SL PRS resources, and the comb tooth sizes of the 4 SL PRS resources are all 4, but the RE offsets are 0 to 3 respectively. Therefore, the corresponding SL PRS resource IDs are 0, 1, 2, and 3 respectively.

[0184] In some embodiments, the parameter used to indicate the frequency domain position offset of the SL PRS sent within the SL PRS resource can be understood as a parameter used to indicate the RE offset of the SL PRS sent within the SL PRS resource.

[0185] In some embodiments, the parameter used to indicate the number of time domain resources occupied by the SL PRS resource can be understood as the parameter used to indicate the number of time domain units occupied by the SL PRS resource. For example, the parameter can be used to indicate the number of OFDM symbols occupied by the SL PRS resource, that is, the time domain resources occupied by the SL PRS resource may include one or more OFDM symbols, and the number of the one or more OFDM symbols can be indicated by the parameter. However, the embodiments of the present application are not limited to this. For example, the parameter can be used to indicate the number of time slots occupied by the SL PRS resource, etc.

[0186] In some embodiments, the parameter for indicating the number of time domain resources occupied by the SL PRS resource can be used to indicate the number of consecutive time domain resources occupied by the SL PRS resource. For example, the parameter can be used to indicate that the SL PRS resource occupies M consecutive indexed time domain resources (e.g., M consecutive indexed OFDM symbols).

[0187] It should be noted that the first resource configuration may also include other parameters in addition to the parameters listed above, which are not limited in the embodiments of the present application. For example, the first resource configuration may also include parameters related to indicating the frequency domain location of the SL PRS resource.

[0188] In some embodiments, the determination of the first resource configuration may be related to multiple parameters (factors). For example, the determination of the first resource configuration may be related to one or more parameters of resources within the resource pool used to transmit sidelink information other than the SL PRS. Exemplarily, the determination of the first resource configuration may be related to one or more of the following parameters: a second parameter, a third parameter, and a fourth parameter.

[0189] The second parameter can be used to indicate the time domain resources occupied by the PSSCH DMRS allowed in the resource pool. In some embodiments, the time domain resources occupied by the PSSCH DMRS cannot be used for SL PRS resources. That is, in some embodiments, the second parameter can be used to exclude which time domain resources cannot be occupied by SL PRS resources.

[0190] The third parameter can be used to indicate the number of time domain resources that are not used for PSFCH transmission and GP in a time domain unit of the resource pool. In other words, the third parameter can be used to indicate the number of time domain resources that can be used for PSSCH and PSCCH transmission in a time domain unit of the resource pool (including the time domain resources where the AGC is located in the time domain unit, such as the OFDM symbol where the AGC is located). In some embodiments, the time domain resources occupied by PSFCH and GP cannot be used for SL PRS resources, or in other words, the time domain resources occupied by PSSCH, PSCCH, and AGC may be used for SL PRS resources. That is, in some embodiments, the third parameter can be used to exclude which time domain resources cannot be occupied by SL PRS resources, or in other words, the third parameter can be used to determine which available time domain resources may be occupied by SL PRS resources.

[0191] The fourth parameter can be used to indicate the time domain resources where the PSCCH is located in the resource pool. In some embodiments, the time domain resources where the PSCCH is located cannot be used for SL PRS resources. That is, in some embodiments, the fourth parameter can be used to exclude which time domain resources cannot be occupied by SL PRS resources.

[0192] In some embodiments, different combinations of the second parameter and the third parameter may correspond to different first resource configurations. In other words, SL PRS resource configurations may be performed separately for different combinations of the second parameter and the third parameter.

[0193] In some embodiments, different second parameters may correspond to different first resource configurations. In other words, SL PRS resource configurations may be performed separately for different second parameters.

[0194] The following text will describe in detail how to configure SL PRS resources based on one or more of the above parameters. For the sake of brevity, it will not be described here.

[0195] In some embodiments, the determination of the first resource configuration may be related to other parameters in addition to the above parameters. For example, the determination of the first resource configuration may be related to a fifth parameter, which may be used to indicate the time domain resources that can be used for PSSCH transmission in a time domain unit within the resource pool, or in other words, the fifth parameter may be used to indicate the time domain resources where the PSSCH is located in a time domain unit within the resource pool. In some embodiments, the time domain resources where the PSSCH is located can be used for SL PRS resources. In other words, the fifth parameter may be used to determine which available time domain resources may be occupied by the SL PRS resources.

[0196] From the above introduction, it can be seen that in some embodiments, the SL PRS resources corresponding to the first resource configuration may not include one or more of the following: time domain resources occupied by the PSSCH DMRS allowed in the resource pool, time domain resources where the PSCCH in the resource pool is located, time domain resources where the PSFCH in the resource pool is located, time domain resources where the GP symbols in the resource pool are located, etc.

[0197] As mentioned above, SL PRS resources can occupy one or more time domain resources. In some embodiments, part of the time domain resources in the one or more time domain resources occupied by SL PRS resources can be included in different SL PRS resource configurations. For example, SL PRS resources can occupy one or more OFDM symbols, and part of the OFDM symbols (at least one OFDM symbol) in the one or more OFDM symbols can be included in different SL PRS resource configurations. This approach can achieve more flexible SL PRS resource configurations. In some embodiments, a time-frequency resource (such as an OFDM symbol) can be included in different SL PRS resource configurations because different terminal devices are not supported in the resource pool to use time-division multiplexed SL PRS resources, and the same terminal device cannot use multiple time-division multiplexed SL PRS resources. Therefore, a time-frequency resource can belong to different SL PRS resource configurations.

[0198] For ease of understanding, this is introduced below in conjunction with Figure 20. Figure 20 is a structural diagram of the time slot provided by an embodiment of the present application. In this example, it is assumed that the SL PRS resource configuration includes a first SL PRS resource configuration and a second SL PRS resource configuration. The parameters included in the first SL PRS resource configuration are used to indicate that the starting OFDM symbol of the SL PRS resource = 7, and the number of consecutive OFDM symbols occupied by the SL PRS resource = 4. Therefore, the SL PRS resources determined according to the first SL PRS resource configuration are OFDM symbols 7 to 10. The parameters included in the second resource configuration are used to indicate that the starting OFDM symbol of the SL PRS resource = 10, and the number of consecutive OFDM symbols occupied by the SL PRS resource = 1. Therefore, the SL PRS resource determined according to the second SL PRS resource configuration is OFDM symbol 10. In this case, referring to Figure 20, OFDM symbol 10 is included in two different SL PRS resource configurations.

[0199] As described above, the parameters included in the first resource configuration may be different. In some embodiments, when the parameters included in the first resource configuration are different, the method for determining the first resource configuration may also be different. For example, when the configuration parameters related to determining the time domain starting position of the SL PRS resource included in the first resource configuration are different, the method for determining the first resource configuration may be different. This will be introduced below in conjunction with Example 1 and Example 2.

[0200] Example 1: The first resource configuration includes the first parameter

[0201] In the first embodiment, the first resource configuration includes a parameter indicating the time domain starting position of the SL PRS resource (hereinafter referred to as the first parameter). In other words, in the first embodiment, the first resource configuration includes a parameter directly indicating the time domain starting position of the SL PRS resource. For example, the first resource configuration includes the starting OFDM symbol of the SL PRS resource (the starting point of the OFDM symbol of the SL PRS resource).

[0202] In some embodiments, in addition to the first parameter, the first resource configuration may also include other SL PRS resource-related configuration parameters. For example, the first resource configuration may also include one or more of the following parameters: a configuration parameter related to the identifier of the SL PRS resource; a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource; a parameter for indicating the number of time domain resources (such as OFDM symbols) occupied by the SL PRS resource, etc. In some embodiments, the parameter for indicating the number of time domain resources occupied by the SL PRS resource may refer to a parameter that can be used to indicate the number of continuous time domain resources occupied by the SL PRS resource, such as the number of continuous OFDM symbols occupied.

[0203] As an example, the first resource configuration may include the following parameters: a configuration parameter related to the identifier of the SL PRS resource, a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource, a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource, a first parameter, and a parameter for indicating the number of time domain resources occupied by the SL PRS resource. For example, the first resource configuration may include parameters {SL PRS resource ID, comb tooth size N of the SL PRS sent within the SL PRS resource, RE offset C of the SL PRS sent within the SL PRS resource, starting OFDM symbol S of the SL PRS resource, number M of consecutive OFDM symbols occupied by the SL PRS resource}.

[0204] In some embodiments, the SL PRS resource ID is unique within a time domain unit (eg, a time slot).

[0205] As another example, the first resource configuration may include the following parameters: a configuration parameter related to the identifier for indicating the SL PRS resource, a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource, a first parameter, and a parameter for indicating the number of time domain resources occupied by the SL PRS resource. For example, the first resource configuration may include {SL PRS resource ID starting point A, comb tooth size N of the SL PRS sent within the SL PRS resource, starting OFDM symbol S of the SL PRS resource, number M of consecutive OFDM symbols occupied by the SL PRS resource}. In this case, for any of the above sets of configurations, N SL PRS resources with different RE offsets can be determined, and the SL PRS resource IDs corresponding to the N SL PRS resources are A, A+1,…,A+N-1 respectively. Taking the time slot structure shown in Figure 20 as an example, assuming that the starting point of the SL PRS resource ID indicated in the first resource configuration shown in Figure 20 is 0, N=4, then under this configuration, the first device can determine 4 SL PRS resources. The 4 SL PRS resources are all located in OFDM symbols 7 to 10, and the comb tooth size is 4, but the RE offsets are 0 to 3, respectively, and the corresponding SL PRS resource IDs are 0, 1, 2 and 3, respectively.

[0206] In some embodiments, the determination of the first resource configuration is related to resources in the resource pool other than the SL PRS resources for transmitting other sidelink information. For example, the determination of the first resource configuration is related to one or more of the second parameter, the third parameter, and the fourth parameter mentioned above.

[0207] In some embodiments, since the number and / or position of the time domain resources occupied by the PSSCH DMRS in the resource pool may be different, and the time domain resources occupied by the PSSCH DMRS in the resource pool have an impact on the determination of the SL PRS resources. Therefore, in some embodiments, the first resource configuration can be determined based on the time domain resources occupied by the PSSCH DMRS. Exemplarily, the time domain resources occupied by the PSSCH DMRS in the resource pool can be indicated by the PSSCH DMRS pattern. That is to say, a plurality of different PSSCH DMRS patterns may be allowed in the resource pool, and the number and position of the PSSCH DMRS contained in different PSSCH DMRS patterns may be different. Therefore, the first resource configuration can be determined based on the PSSCH DMRS pattern allowed in the resource pool. In some embodiments, the time domain resources occupied by the PSSCH DMRS cannot be used for SL PRS resources because the transmission priority of the PSSCH DMRS is higher than the transmission priority of the SL PRS.

[0208] In some embodiments, since PSFCH resources may be configured on certain time domain units in the resource pool, the time domain resources occupied by PSFCH and the GP before the OFDM symbol where the PSFCH is located cannot be used for SL PRS resources, resulting in the number of resources available for PSCCH and PSSCH transmission (including the time domain resources where the AGC is located, where the time domain resources where the AGC is located can be understood as the time domain resources that carry the copied PSCCH / PSSCH) being unequal in different time domain units. In some embodiments, the reason why PSFCH resources cannot be used for SL PRS resources is that SL PRS will affect the PSFCH transmitted by other UEs in the resource pool.

[0209] Therefore, in some embodiments, the first resource configuration can be determined based on the PSFCH resources configured in the time domain unit or based on the number of resources that can be used for PSCCH and PSSCH transmission in the time domain unit. Taking the time domain unit as a time slot and the time domain resources occupied by the resources as OFDM symbols as an example, PSFCH resources may be configured on only some time slots in the resource pool, resulting in the number of OFDM symbols that can be used for PSCCH and PSSCH transmission (including OFDM symbols that carry duplicated PSCCH / PSSCH, i.e., AGC symbols) being unequal in different time slots. Therefore, the first resource configuration can be determined based on the number of OFDM symbols that are not used for PSFCH and GP in a time slot in the resource pool, or in other words, the first resource configuration can be determined based on the number of OFDM symbols (including AGC symbols) that can be used for PSCCH and PSSCH transmission in a time slot in the resource pool.

[0210] In some embodiments, if a timeslot is configured with a PSFCH resource, two OFDM symbols are used in that timeslot to carry the PSFCH, with the first and second OFDM symbols of these two OFDM symbols both used for the GP. Referring to Figure 9 above, the PSFCH resource typically occupies OFDM symbols 11-12, with OFDM symbols 10 and 13 used as the GP. Consequently, the number of time domain resources available for PSCCH and PSSCH transmission in that timeslot (including the time domain resources where the AGC resides) is 10.

[0211] In some embodiments, the time domain resources (such as OFDM symbols) where the PSCCH is located cannot be used for SL PRS resources. Therefore, the first resource configuration can be determined based on the time domain resources where the PSCCH is located. In this case, it can be considered that the transmission priority of the PSCCH is higher than the transmission priority of the SL PRS. However, the embodiments of the present application are not limited to this. In some embodiments, the time domain resources where the PSCCH is located can be used for SL PRS resources.

[0212] For the sake of simplicity, the number of time domain resources (including the time domain resources where the AGC is located) that can be used for PSCCH and PSSCH transmission in a time domain unit in the resource pool (i.e., the third parameter mentioned above) is recorded as l d For the sake of brevity, the following description is based on an example in which the time domain resources occupied by the PSSCH DMRS in the resource pool (ie, the second parameter mentioned above) are indicated by the PSSCH DMRS pattern.

[0213] The following examples are given based on the PSSCH DMRS pattern and / or l allowed in the resource pool: d Several implementations of the first resource configuration are determined.

[0214] Implementation method 1:

[0215] For different PSSCH DMRS patterns and l d combination, that is, for different {PSSCH DMRS patterns, l d}, respectively determine the first resource configuration. In other words, for different PSSCH DMRS patterns and l d The SL PRS resources are configured or pre-configured separately.

[0216] In implementation 1, each group of SL PRS configurations corresponds to a specific {PSSCH DMRS pattern, l d That is, when different PSSCH DMRS patterns are allowed in the resource pool and / or different l d The first resource configuration will be for different {PSSCH DMRS patterns, l d} separately configured, or in other words, SL PRS resources will be configured for different {PSSCH DMRS patterns, l d}Configured individually or pre-configured.

[0217] In some embodiments, for a certain {PSSCH DMRS pattern, l d} configured or pre-configured SL PRS resources, the SL PRS resources may not include the time domain resources used for PSCCH transmission (or the time domain resources where the PSCCH is located), and the time domain resources included in the PSSCH DMRS pattern (or the time domain resources occupied by the PSSCH DMRS pattern). For example, for a certain {PSSCH DMRS pattern, l d}Configured or pre-configured SL PRS resources, which do not include OFDM symbols used for PSCCH transmission and OFDM symbols included in the PSSCH DMRS pattern.

[0218] As an example, assume that the resource pool allows PSSCH DMRS patterns of 2, 3, and 4 OFDM symbols, and the PSFCH period in the resource pool is 4, that is, PFSCH resources exist in the 0th, 4th, 8th, ... time slots of the resource pool. In these time slots where PFSCH resources exist, d =10, this is because, in the time slot with PFSCH resources, PFSCH occupies 2 OFDM symbols, plus one GP symbol before and after PFSCH, the remaining OFDM symbols that can be used for PSCCH and PSSCH transmission are 10; while there is no PSFCH resource in other time slots. In these time slots without PFSCH resources, l d =13, because the last OFDM symbol in the time slot is a GP symbol. In this case, {PSSCH DMRS pattern, l d There are 6 combinations of}. For 6 different {PSSCH DMRS patterns, l d} combination, SL PRS resources are configured separately.

[0219] Implementation 2:

[0220] For different l d (l d In other words, for different l d , SL PRS resources are configured or pre-configured separately.

[0221] In implementation 2, for different l d When the first resource configuration is determined separately, the number of time domain resources occupied by the PSSCH DMRS corresponding to the first resource configuration can be the minimum number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool. In this way, the transmitting terminal of the SL PRS can only use the PSSCH DMRS resource with the least number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool, or in other words, the transmitting terminal of the SL PRS can only select the PSSCH DMRS resource with the least number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool.

[0222] Taking the time domain resource occupied by PSSCH DMRS as an example, the first resource configuration corresponds to the PSSCH DMRS pattern with the least number of PSSCH DMRS symbols allowed in the resource pool. dWhen the first resource configuration is determined separately, the SL PRS transmitting terminal only uses the PSSCH DMRS pattern with the least number of PSSCH DMRS allowed in the resource pool, or in other words, the SL PRS transmitting terminal can only select the PSSCH DMRS pattern with the least number of PSSCH DMRS symbols allowed in the resource pool.

[0223] In implementation 2, the first resource configuration (SL PRS resource configuration) corresponds to the PSSCH DMRS pattern with the least number of PSSCH DMRS symbols allowed in the resource pool, and different SL PRS resources are not configured for different PSSCH DMRS patterns. d Different time domain units (such as time slots), the first resource configuration will be for different l d That is, in implementation 2, for any different l d , the configured or pre-configured SL PRS resources may not include any OFDM symbols included in the PSSCH DMRS pattern with the minimum number of PSSCH DMRS symbols allowed in the resource pool, but may include OFDM symbols in other PSSCH DMRS patterns.

[0224] As an example, assume that there are PSSCH DMRS patterns of 2, 3, and 4 OFDM symbols in the resource pool, and the PSFCH period in the resource pool is 4, that is, PSFCH resources exist in the 0th, 4th, 8th, ... time slots of the resource pool. In these time slots with PSFCH resources, l d =10, and there is no PSFCH resource in other time slots, l d =13. In this case, there are two different l d (l d =10 and l d =13), for 2 different l d =13, SL PRS resources are configured separately, and for each l d =13 configuration corresponds to a first resource configuration where the number of PSSCH DMRSs is 2.

[0225] Implementation 3:

[0226] For different l d (l d In other words, for different l d , SL PRS resources are configured separately.

[0227] In implementation method 3, the SL PRS resources corresponding to the first resource configuration do not include one or more of the following: the time domain resources occupied by the PSSCH DMRS allowed in the resource pool, and the time domain resources where the PSCCH in the resource pool is located. That is to say, any time domain resources occupied by a PSSCH DMRS configured in the resource pool and / or the time domain resources where the PSCCH is located cannot be configured as SL PRS resources. For example, the SL PRS resources corresponding to the first resource configuration do not include the time domain resources occupied by the PSSCH DMRS allowed in the resource pool, and the time domain resources where the PSCCH in the resource pool is located. In other words, any time domain resources occupied by a PSSCH DMRS configured in the resource pool and the time domain resources where the PSCCH is located cannot be configured as SL PRS resources.

[0228] Taking the time domain resource occupied by PSSCH DMRS as an OFDM symbol as an example, the SL PRS resource corresponding to the first resource configuration does not include the OFDM symbol where the PSSCH DMRS pattern allowed in the resource pool is located and the OFDM symbol where the PSCCH is located. In other words, any OFDM symbol where a PSSCH DMRS pattern configured in the resource pool is located and the OFDM symbol where the PSCCH is located cannot be configured as an SL PRS resource.

[0229] In implementation 3, the first resource configuration corresponds to all PSCCH DMRS patterns allowed in the resource pool. d Different time domain units (such as time slots), the first resource configuration will be for different l d That is, in implementation 3, for any different l d The configured or pre-configured SL PRS resources may not include any OFDM symbols that may be used for PSSCH DMRS, and may also not include the OFDM symbols where PSCCH is located.

[0230] As an example, assume that the resource pool allows PSSCH DMRS patterns of 2 and 3 OFDM symbols, and the PSFCH period in the resource pool is 4, that is, PFSCH resources exist in the 0th, 4th, 8th, ... time slots of the resource pool. In these time slots where PSFCH resources exist, d =10, and there is no PSFCH resource in other time slots, l d =13. At the same time, in this example, it is assumed that the number of OFDM symbols occupied by the PSCCH in the resource pool is 2. d In this case, examples of OFDM symbols that may be used for PSSCH DMRS are shown in Table 3. d= 13, any configured or pre-configured SL PRS resource cannot contain OFDM symbols 1, 2, 3, 6, 10 and 11. This is because d =13, OFDM symbols 1, 3, 6, 10 and 11 can be used as OFDM symbols for PSSCH DMRS, and OFDM symbols 1 and 2 are the OFDM symbols where PSCCH is located. Therefore, OFDM symbols 1, 2, 3, 6, 10 and 11 cannot be used for SL PRS resources. d = 10, any configured or pre-configured SL PRS resource cannot contain OFDM symbols 1, 2, 3, 4, 7 and 8. This is because l d When =10, OFDM symbols 1, 3, 4, 7 and 8 can be used as OFDM symbols of PSSCH DMRS, and OFDM symbols 1 and 2 are the OFDM symbols where PSCCH is located. Therefore, OFDM symbols 1, 2, 3, 4, 7 and 8 cannot be used for SL PRS resources.

[0231] Table 3

[0232] Implementation 4:

[0233] The SL PRS resources corresponding to the first resource configuration do not include one or more of the following: the time domain resources occupied by the PSSCH DMRS allowed in the resource pool, and the time domain resources where the PSCCH in the resource pool is located. In other words, any time domain resources occupied by a PSSCH DMRS configured in the resource pool and / or the time domain resources where the PSCCH is located cannot be configured as SL PRS resources. For example, the SL PRS resources corresponding to the first resource configuration do not include the time domain resources occupied by the PSSCH DMRS allowed in the resource pool, and the time domain resources where the PSCCH in the resource pool is located. In other words, any time domain resources occupied by a PSSCH DMRS configured in the resource pool and the time domain resources where the PSCCH is located cannot be configured as SL PRS resources.

[0234] Taking the time domain resource occupied by PSSCH DMRS as an OFDM symbol as an example, the SL PRS resource corresponding to the first resource configuration does not include the OFDM symbol where the PSSCH DMRS pattern allowed in the resource pool is located and the OFDM symbol where the PSCCH is located. In other words, any OFDM symbol where a PSSCH DMRS pattern configured in the resource pool is located and the OFDM symbol where the PSCCH is located cannot be configured as an SL PRS resource.

[0235] In implementation 4, the first resource configuration corresponds to all {PSSCH DMRS patterns, l d}, that is, in implementation mode 4, there is no need to specify different PSSCH DMRS patterns and / or d Configure SL PRS resources separately.

[0236] Taking the time domain resource occupied by PSSCH DMRS as OFDM symbol as an example, in implementation mode 4, the configured or pre-configured SL PRS resource does not include any l d Any OFDM symbol that may be used for PSSCH DMRS in the time slot of the resource pool does not include the OFDM symbol where PSCCH is located. As an example, assume that the resource pool allows PSSCH DMRS patterns of 2 and 3 OFDM symbols, and the PSFCH period in the resource pool is 4, that is, PFSCH resources exist in the 0th, 4th, 8th, ... time slots of the resource pool. In these time slots where PSFCH resources exist, l d =10, and there is no PSFCH resource in other time slots, l d =13. In this example, it is assumed that the number of OFDM symbols occupied by the PSCCH in the resource pool is 2. Referring to Table 3, any configured or pre-configured SL PRS resource cannot contain OFDM symbols 1, 2, 3, 4, 6, 7, 8, 10, and 11. In other words, any configured or pre-configured SL PRS resource cannot contain l d =13 corresponding to the PSSCH DMRS symbol, can not contain l d =10, the PSSCH DMRS symbol corresponding to the OFDM symbol where the PSCCH is located cannot also be included.

[0237] It should be noted that, for any of the implementations mentioned in Example 1 (any of implementations 1 to 4), the number of SL PRS resources included in the first resource configuration determined according to the implementation may be 0, that is, there are no SL PRS resources, and this embodiment of the application does not limit this. In other words, for any of the above implementations, for a certain {PSSCH DMRS pattern, l d} or for some l d , the number of configured or pre-configured SL PRS resources can be 0.

[0238] In the first embodiment, different PSSCH DMRS and / or d Separately configuring SL PRS resources helps ensure that the configured SL PRS resources are more reasonable and effective.

[0239] Example 2: The first resource configuration does not include the first parameter

[0240] In the second embodiment, the first resource configuration does not include a parameter indicating the time domain starting position of the SL PRS resource (the first parameter mentioned above). In other words, in the second embodiment, the first resource configuration does not include a parameter directly indicating the time domain starting position of the SL PRS resource. For example, the first resource configuration does not include the starting OFDM symbol of the SL PRS resource (the starting point of the OFDM symbol of the SL PRS resource).

[0241] In some embodiments, the first resource configuration may include one or more of the following parameters: a configuration parameter related to an identifier indicating the SL PRS resource; a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource; a parameter for indicating the number of time domain resources (such as OFDM symbols) occupied by the SL PRS resource, etc. In some embodiments, the parameter for indicating the number of time domain resources occupied by the SL PRS resource may refer to a parameter that can be used to indicate the number of consecutive time domain resources occupied by the SL PRS resource, such as the number of consecutive OFDM symbols occupied.

[0242] In some embodiments, the first resource configuration does not include the first parameter, but may include other configuration parameters related to determining the time domain starting position of the SL PRS resource. For example, the first resource configuration may include a parameter indicating the first time domain resource that can be used for the SL PRS resource within a time domain unit (such as a time slot). That is, in embodiment two, the first resource configuration includes a parameter indicating the possible time domain starting position of the SL PRS resource. For a detailed introduction to this parameter, please refer to the previous introduction.

[0243] In some embodiments, in embodiment 2, the first resource configuration may include one or more of the following parameters: a configuration parameter related to the identifier of the SL PRS resource; a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource; a parameter for indicating the number of time domain resources (such as OFDM symbols) occupied by the SL PRS resource, a parameter for indicating the possible time domain starting position of the SL PRS resource (such as a parameter indicating the first time domain resource that can be used for the SL PRS resource within a time domain unit), etc. In some embodiments, the parameter for indicating the number of time domain resources occupied by the SL PRS resource may refer to a parameter that can be used to indicate the number of consecutive time domain resources occupied by the SL PRS resource, such as the number of consecutive OFDM symbols occupied.

[0244] In some embodiments, when the first resource configuration does not include the first parameter, the first device may indirectly determine the time domain starting position of the SL PRS resource corresponding to the first resource configuration based on other parameters in the first resource configuration. For example, the first device may determine the time domain starting position of the SL PRS resource based on the parameters for indicating the number of time domain resources occupied by the SL PRS resource and other conditions that need to be met. Alternatively, the first device may determine the time domain starting position of the SL PRS resource based on the parameters for indicating the possible time domain starting position of the SL PRS resource, the parameters for indicating the number of time domain resources occupied by the SL PRS resource and other conditions that need to be met.

[0245] In some embodiments, the parameter used to indicate the number of time domain resources occupied by SL PRS resources means that the parameter can indicate the continuous time domain resources occupied by SL PRS resources. For example, the parameter can indicate that SL PRS resources occupy M consecutive indexed time domain resources, where M is a positive integer.

[0246] In some embodiments, when the first resource configuration does not include the first parameter, the first device may use the last one or more time domain resources of a time domain unit as a reference to determine the time domain resources occupied by the SL PRS resources. For example, the number of time domain resources occupied by the SL PRS resources is M, and the M time domain resources may be the last M consecutive indexed time domain resources that meet specific conditions within a time domain unit. Taking a time domain unit as a time slot as an example, the SL PRS resources occupy M OFDM symbols, and the M OFDM symbols may be the last M consecutive indexed OFDM symbols that meet specific conditions within a time slot. In this way, the SL PRS is always located on the last M time domain resources that meet specific conditions within a time domain unit, which can avoid the impact of the SL PRS transmission on the second-order SCI transmission as much as possible.

[0247] In some embodiments, when the first resource configuration does not include the first parameter, the first device may use the first time domain resource that can be used for SL PRS resources in a time domain unit as a reference to determine the time domain resources occupied by the SL PRS resources. For example, the number of time domain resources occupied by the SL PRS resources is M, and the M time domain resources may be M consecutive time domain resources that meet specific conditions, starting from the time domain resource used to indicate the first time domain resource that can be used for SL PRS resources in a time domain unit. Taking a time domain unit as a time slot as an example, the SL PRS resources occupy M OFDM symbols, and the first OFDM symbol index that can be used for SL PRS resources in the time slot is Q, then the M OFDM symbols may be M consecutive OFDM symbols that meet specific conditions, starting from Q. Introducing the first time domain resource that can be used for SL PRS resources in the time domain unit as a reference in this way can configure the position of the SL PRS resources more flexibly.

[0248] The embodiments of the present application are not limited to using the above-mentioned reference points to determine the time domain resources occupied by the SL PRS resources. For example, the index of a middle time domain resource among the M time domain resources can also be used as a reference to determine the time domain resources occupied by the SL PRS resources.

[0249] In some embodiments, the above-mentioned condition for determining the time domain starting position of the SL PRS resource may be related to the resources in the resource pool used to send other side information other than the SL PRS. For example, the condition may be related to one or more of the following information: resources in the resource pool that can be used for PSSCH transmission, time domain resources occupied by the PSSCH DMRS in the resource pool, time domain resources where the PSCCH in the resource pool is located, etc. However, the embodiments of the present application are not limited to this. In some embodiments, the condition may also be related to other information, such as the time domain resources where the PSFCH in the resource pool is located.

[0250] Exemplarily, assuming that the number of time domain resources occupied by SL PRS resources is M, the above-mentioned specific conditions may include one or more of the following: M time domain resources with consecutive indexes can be used for PSSCH transmission, M time domain resources with consecutive indexes do not belong to the time domain resources occupied by PSSCH DMRS, and PSCCH does not exist on the M time domain resources with consecutive indexes. In other words, the M time domain resources used for SL PRS transmission can share time domain resources with PSSCH, but the time domain resources where PSSCH DMRS and PSCCH are located cannot be used to send SL PRS. This is because the transmission priority of PSSCH DMRS and PSCCH is higher than that of SL PRS.

[0251] The second embodiment is described below with reference to examples.

[0252] As an example, the first resource configuration may include the following parameters: a configuration parameter related to the identifier for indicating the SL PRS resource, a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource, a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource, and a parameter for indicating the number of time domain resources occupied by the SL PRS resource. For example, the first resource configuration may include parameters {SL PRS resource ID, comb tooth size N of the SL PRS sent within the SL PRS resource, RE offset C of the SL PRS sent within the SL PRS resource, number M of consecutive OFDM symbols occupied by the SL PRS resource}.

[0253] In some embodiments, the SL PRS resource ID is unique within a time domain unit (eg, a time slot).

[0254] In this example, the number M of consecutive OFDM symbols occupied by the SL PRS resource may refer to the last M consecutive OFDM symbols in a time slot that meet specific conditions.

[0255] In some embodiments, the M consecutively indexed OFDM symbols that meet specific conditions meet at least one of the following conditions: according to the configuration in the resource pool, the M consecutively indexed OFDM symbols can be used for PSSCH transmission; according to the configuration in the resource pool, none of the M consecutively indexed OFDM symbols belongs to the PSSCH DMRS pattern selected by the terminal device; according to the configuration in the resource pool, no PSCCH exists on any of the M OFDM symbols. For example, the M consecutively indexed OFDM symbols need to meet all of the above conditions.

[0256] Figure 21 is a structural diagram of the time slot provided by another embodiment of the present application. In this example, it is assumed that the SL PRS resource configuration includes a first SL PRS resource configuration and a second SL PRS resource configuration. The parameters included in the first SL PRS resource configuration are used to indicate the number of consecutive OFDM symbols occupied by the SL PRS resource M=4. Therefore, the SL PRS resources determined according to the first SL PRS resource configuration are OFDM symbols 7 to 10. The parameters included in the second SL PRS resource configuration are used to indicate the number of consecutive OFDM symbols occupied by the SL PRS resource M=1. Therefore, the SL PRS resources determined according to the second SL PRS resource configuration are OFDM symbol 12.

[0257] As another example, the first resource configuration may include the following parameters: a configuration parameter related to the identifier for indicating the SL PRS resource, a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource, a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource, a parameter for indicating the number of time domain resources occupied by the SL PRS resource, and a parameter for indicating the first time domain resource that can be used for the SL PRS resource within a time domain unit. For example, the first resource configuration may include parameters {SL PRS resource ID, comb tooth size N of the SL PRS sent within the SL PRS resource, RE offset C of the SL PRS sent within the SL PRS resource, number M of consecutive OFDM symbols occupied by the SL PRS resource, index R of the first OFDM symbol that can be used for the SL PRS resource within a time slot}.

[0258] In some embodiments, the SL PRS resource ID is unique within a time domain unit (eg, a time slot).

[0259] In this example, the number M of consecutive OFDM symbols occupied by the SL PRS resource may refer to M consecutive OFDM symbols starting from an OFDM symbol index R within the time slot.

[0260] In some embodiments, the M consecutively indexed OFDM symbols satisfy at least one of the following conditions: according to the configuration in the resource pool, the M consecutively indexed OFDM symbols can be used for PSSCH transmission; according to the configuration in the resource pool, none of the M consecutively indexed OFDM symbols belongs to the PSSCH DMRS pattern selected by the terminal device; according to the configuration in the resource pool, no PSCCH exists on any of the M OFDM symbols. For example, the M consecutively indexed OFDM symbols need to satisfy all of the above conditions.

[0261] Figure 22 is a structural diagram of a time slot provided by another embodiment of the present application. In this example, it is assumed that the SL PRS resource configuration includes a first SL PRS resource configuration and a second SL PRS resource configuration. The parameters included in the first SL PRS resource configuration are used to indicate the first OFDM symbol index R=5 that can be used for SL PRS resources in the time slot, and the number of consecutive OFDM symbols occupied by SL PRS resources is M=4. Therefore, the SL PRS resources determined according to the first SL PRS resource configuration are OFDM symbols 7 to 10. The parameters included in the second SL PRS resource configuration are used to indicate the first OFDM symbol index R=5 that can be used for SL PRS resources in the time slot, and the number of consecutive OFDM symbols occupied by SL PRS resources is M=1. Therefore, the SL PRS resources determined according to the second SL PRS resource configuration are OFDM symbol 5.

[0262] In the second embodiment, there is no need to specify different PSSCH DMRS and / or d Configuring SL PRS resources separately can simplify the configuration of SL PRS resources.

[0263] As mentioned above, the first resource configuration may be determined according to the identification information of the SL PRS resource, which will be described in detail below in conjunction with the third embodiment.

[0264] Example 3: Determining the first resource configuration according to the identification information of the SL PRS resource

[0265] In some embodiments, the first resource configuration corresponds to the identification information of the SL PRS resource, or in other words, there is (exists) an association / correspondence between the first resource configuration and the identification information of the SL PRS resource. Therefore, the parameters included in the first resource configuration can be determined based on the identification information of the SL PRS resource.

[0266] In some embodiments, one or more of the following parameters included in the first resource configuration can be determined based on the identification information of the SL PRS resource: a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource, a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource, a parameter for indicating the number of time domain resources occupied by the SL PRS resource, etc.

[0267] In some embodiments, the parameter for indicating the time domain starting position of the SL PRS resource within a time domain unit (i.e., the first parameter mentioned above) can be determined according to the method shown in the above embodiment 1 or embodiment 2. For example, the starting OFDM symbol of the SL PRS resource in the time slot can be determined according to the method shown in embodiment 1 or embodiment 2.

[0268] In some embodiments, the identification information of the SL PRS resource may be indicated by using a SL PRS resource ID. For the sake of brevity, the following description will be made by taking the identification information of the SL PRS resource as the SL PRS resource ID as an example.

[0269] In embodiment three, there is a specific association relationship between one or more of the parameters included in the first resource configuration and the SL PRS resource ID, so the first device can determine the parameters included in the first resource configuration through the SL PRS resource ID. For example, there is a specific association relationship between the comb tooth size of the SL PRS sent within the SL PRS resource, the RE offset of the SL PRS sent within the SL PRS resource, and the number of consecutive OFDM symbols occupied by the SL PRS resource in the time slot and the SL PRS resource ID, and these parameters can all be determined by the SL PRS resource ID.

[0270] In some embodiments, the association relationship between the first resource configuration and the SL PRS resource ID may be configured by a network device. In some embodiments, the association relationship between the first resource configuration and the SL PRS resource ID may be protocol predefined or preconfigured, which is not limited in the embodiments of the present application. In other words, the association relationship between the various parameters included in the first resource configuration and the SL PRS resource ID may be network device configured, preconfigured, or protocol predefined, etc.

[0271] In some embodiments, the determination of the parameters included in the first resource configuration may be related to other information in addition to the SL PRS resource ID. Exemplarily, the parameters included in the first resource configuration are determined based on one or more of the following: the SL PRS resource ID, the comb tooth size that can be used by the SL PRS sent within the SL PRS resource, the number of RE offsets that can be used by the SL PRS sent within the SL PRS resource, etc.

[0272] As an example, the parameters included in the first resource configuration can be determined based on the SL PRS resource ID and the comb tooth size that can be used by the SL PRS sent within the SL PRS resource. For example, the comb tooth sizes that can be used by the SL PRS sent within the SL PRS resource include 1, 2, and 4, and the parameters included in the first resource configuration can be determined based on the SL PRS resource ID and the sum of different comb tooth sizes (1+2+4=7).

[0273] As another example, the parameters included in the first resource configuration can be determined based on the SL PRS resource ID and the number of RE offsets that can be used by the SL PRS sent within the SL PRS resource. For example, the comb tooth sizes that can be used by the SL PRS sent within the SL PRS resource include 1, 2, and 4, and the parameters included in the first resource configuration can be determined based on the SL PRS resource ID and the number of RE offsets (a comb tooth size of 1 corresponds to 1 type of RE offset, a comb tooth size of 2 corresponds to 2 types of RE offsets, and a comb tooth size of 4 corresponds to 4 types of RE offsets, so the number of RE offsets that can be used by the SL PRS is 1+2+4=7).

[0274] For ease of understanding, a specific example of determining the parameters included in the first resource configuration according to the SL PRS resource ID is given below.

[0275] Assuming that the available comb tooth sizes of SL PRS are 1, 2 and 4, for any given SL PRS resource ID (for example, the value of the ID is D), D can be counted from 0, and the parameters included in the first resource configuration can be determined in the following way.

[0276] The comb size and RE offset of the SL PRS sent within the SL PRS resource are determined as follows: if mod(D,7)=0, the comb size is 1 and the RE offset is 0; if mod(D,7)=1, the comb size is 2 and the RE offset is 0; if mod(D,7)=2, the comb size is 2 and the RE offset is 1; if mod(D,7)=3, the comb size is 4 and the RE offset is 0; if mod(D,7)=4, the comb size is 4 and the RE offset is 1; if mod(D,7)=5, the comb size is 4 and the RE offset is 2; if mod(D,7)=6, the comb size is 4 and the RE offset is 3. In this example, mod represents the remainder operation.

[0277] Determination of the number of time domain resources occupied by the SL PRS resource in one time domain unit: The number of time domain resources occupied by the SL PRS resource in one time domain unit is equal to floor(D / 7)+1. In this example, floor represents a rounding operation. For example, the number of consecutive OFDM symbols occupied by the SL PRS resource in a time slot can be equal to floor(D / 7)+1.

[0278] The time domain starting position of the SL PRS resource in a time domain unit can be determined according to the method of the above embodiment 1 or embodiment 2. For example, the starting OFDM symbol of the SL PRS resource in a time slot can be determined according to the method of embodiment 1 or embodiment 2.

[0279] It should be noted that the various embodiments mentioned in this application can be used in combination or individually, and the embodiments of this application are not limited to this. For example, the above-mentioned embodiment 1 can be used alone or in combination with embodiment 3. For another example, the above-mentioned embodiment 2 can be used alone or in combination with embodiment 3, etc.

[0280] As described above, the first device in the embodiment of the present application can be one or more of a sending terminal of an SL PRS, a receiving terminal of an SL PRS, a positioning server, and a service terminal device. In some embodiments, when the first device is a terminal device (for example, a sending terminal of an SL PRS, a receiving terminal of an SL PRS), the first device can also select an SL PRS resource according to the first resource configuration. This is described below in conjunction with Figure 23.

[0281] Figure 23 is a flow chart of a method for wireless communication provided by another embodiment of the present application. The method shown in Figure 23 may include step S2310 and step S2320.

[0282] In step S2310 , the first device determines a first resource configuration.

[0283] For a detailed introduction to step S2310, please refer to the previous introduction to step S1910. For the sake of brevity, it will not be repeated here.

[0284] In step S2320, the first device selects SL PRS resources in the resource pool according to the first resource configuration.

[0285] That is, the first device may select a SL PRS resource from configured / preconfigured or optional SL PRS resources in a time domain unit (eg, time slot) to send or receive the SL PRS according to the first resource configuration.

[0286] In some embodiments, one or more parameters for the SL PRS resource are selected by the physical layer of the first device. For example, all parameters for the SL PRS resource are selected by the physical layer of the first device. The physical layer of the first device selects the parameters for the SL PRS resource, which helps increase the flexibility of resource selection.

[0287] As an example, parameters such as the SL PRS resource ID, the comb tooth size and RE offset of the SL PRS sent in the SL PRS resource, the starting OFDM symbol of the SL PRS resource in the time slot and the number of consecutive OFDM symbols occupied, and the frequency domain position of the SL PRS resource are all selected by the physical layer of the first device.

[0288] In some embodiments, some of the one or more parameters for the SL PRS resource are selected by a higher layer of the first device, and another part of the one or more parameters are selected by a physical layer of the first device.

[0289] The high layer of the first device may include multiple types. For example, the high layer of the first device may refer to the MAC layer of the first device. For another example, the high layer of the first device may refer to the SLPP layer of the first device, etc. The embodiment of the present application is not limited to this.

[0290] As an example, a parameter for indicating the frequency domain position of the SL PRS resource among the one or more parameters for the SL PRS resource may be selected by the physical layer of the first device, and other parameters except the parameter may be selected by the upper layer of the first device. For example, the frequency domain position of the SL PRS resource is selected by the physical layer of the first device, and the SL PRS resource ID, the comb tooth size and RE offset of the SL PRS sent in the SL PRS resource, the starting OFDM symbol of the SL PRS resource in the time slot, and the number of continuous OFDM symbols occupied are selected by the upper layer of the first device (such as the MAC layer, the SLPP layer, etc.).

[0291] As another example, among one or more parameters for SL PRS resources, the parameters associated with sideline positioning may be selected by a higher layer of the first device, while the other parameters except the parameters associated with sideline positioning may be selected by a physical layer of the first device. This is because having the parameters associated with sideline positioning determined by the higher layer of the first device facilitates ensuring the QoS requirements of the positioning service, while having the other parameters selected by the physical layer facilitates increased flexibility in resource selection.

[0292] In some embodiments, the parameters associated with side positioning may include one or more of the following parameters: the number of time domain resources occupied by SL PRS resources, and the comb tooth size of the SL PRS sent within the SL PRS resources. The number of time domain resources occupied by SL PRS resources and the comb tooth size of the SL PRS sent within the SL PRS resources will affect the accuracy of positioning. Therefore, it is beneficial to ensure the QoS requirements of the positioning service if these two parameters are determined by the upper layer of the first device. For example, the number of OFDM symbols occupied by SL PRS resources and the comb tooth size of the SL PRS sent within the SL PRS resources can be selected by the upper layer of the first device (such as the MAC layer, the SLPP layer, etc.), and parameters such as the SL PRS resource ID, the RE offset of the SL PRS sent within the SL PRS resource, the starting OFDM symbol of the SL PRS resource in the time slot, and the frequency domain position of the SL PRS resource can be selected by the physical layer of the first device.

[0293] In some embodiments, the SL PRS receiving terminal can receive the SL PRS based on one or more of the following information: whether there are PSFCH resources in the time domain unit (such as time slot), the SL PRS resource ID indicated in the received second-order SCI, and the DMRS pattern indicated in the received first-order SCI, etc.

[0294] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 23. The device embodiment of the present application is described in detail below in conjunction with Figures 24 and 25. 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.

[0295] FIG24 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device 2400 shown in FIG24 can be any of the first devices mentioned above, and the communication device 2400 can include a determination module 2410.

[0296] The determination module 2410 may be configured to determine a first resource configuration, where the first resource configuration is used to configure a sidelink positioning reference signal SL PRS resource in a resource pool.

[0297] Optionally, the first resource configuration includes a first parameter, and the first parameter is used to indicate the time domain starting position of the SL PRS resource.

[0298] Optionally, the first resource configuration also includes one or more of the following parameters: a configuration parameter related to the identifier of the SL PRS resource; a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter for indicating the resource unit RE offset of the SL PRS sent within the SL PRS resource; and a parameter for indicating the number of time domain resources occupied by the SL PRS resource.

[0299] Optionally, the determination of the first resource configuration is related to one or more of the following parameters: a second parameter, used to indicate the time domain resources occupied by the physical sidelink shared channel PSSCH demodulation reference signal DMRS allowed in the resource pool; a third parameter, used to indicate the number of time domain resources in a time domain unit of the resource pool that are not used for the transmission and protection interval of the physical sidelink feedback channel PSFCH; a fourth parameter, used to indicate the time domain resources where the physical sidelink control channel PSCCH in the resource pool is located.

[0300] Optionally, different combinations of the second parameter and the third parameter correspond to different first resource configurations.

[0301] Optionally, different second parameters correspond to different first resource configurations.

[0302] Optionally, the number of time domain resources occupied by the PSSCH DMRS corresponding to the first resource configuration is a minimum value of the number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool.

[0303] Optionally, the SL PRS resources corresponding to the first resource configuration do not include one or more of the following: time domain resources occupied by the PSSCH DMRS allowed in the resource pool; time domain resources where the PSCCH in the resource pool is located.

[0304] Optionally, the first resource configuration includes one or more of the following parameters: a configuration parameter related to the identifier of the SL PRS resource; a parameter for indicating the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter for indicating the RE offset of the SL PRS sent within the SL PRS resource; a parameter for indicating the number of time domain resources occupied by the SL PRS resource; and a parameter for indicating the first time domain resource within a time domain unit that can be used for the SL PRS resource.

[0305] Optionally, the number of time domain resources occupied by the SL PRS resource is M, and the M time domain resources are the last M time domain resources with consecutive indexes within a time domain unit, or the M time domain resources are M time domain resources with consecutive indexes starting from the time domain resource indicated by the parameter used to indicate the first time domain resource in a time domain unit that can be used for the SL PRS resource.

[0306] Optionally, the M time domain resources with consecutive indexes meet one or more of the following conditions: the M time domain resources with consecutive indexes can be used for PSSCH transmission; the M time domain resources with consecutive indexes do not belong to the time domain resources occupied by PSSCH DMRS; PSCCH does not exist on the M time domain resources with consecutive indexes.

[0307] Optionally, the configuration parameters related to the identification of the SL PRS resource include one or more of the following: a parameter for indicating the identification of the SL PRS resource; a parameter for indicating the starting point of the identification of the SL PRS resource.

[0308] Optionally, the first resource configuration corresponds to the identification information of the SL PRS resource, and the parameters included in the first resource configuration are determined based on the identification information of the SL PRS resource.

[0309] Optionally, the identification information of the SL PRS resource is indicated by the SL PRS resource identifier, and the parameters contained in the first resource configuration are determined based on one or more of the following: the SL PRS resource identifier; the comb tooth size that can be used by the SL PRS sent within the SL PRS resource; and the number of RE offsets that can be used by the SL PRS sent within the SL PRS resource.

[0310] Optionally, the parameters included in the first resource configuration include one or more of the following parameters: a parameter used to indicate the comb tooth size of the SL PRS sent within the SL PRS resource; a parameter used to indicate the RE offset of the SL PRS sent within the SL PRS resource; a parameter used to indicate the number of time domain resources occupied by the SL PRS resource.

[0311] Optionally, the first resource configuration is determined based on one or more of the following information: configuration information of the resource pool; positioning requirement information of the terminal device; identification information of the SL PRS resource.

[0312] Optionally, the time domain resources occupied by the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, and at least one of the one or more OFDM symbols is included in different SL PRS resource configurations.

[0313] Optionally, the first device includes one or more of the following: a terminal device, a positioning server.

[0314] Optionally, the first device is a terminal device, and the communication device further includes: a selection module 2420, configured to select SL PRS resources in the resource pool according to the first resource configuration.

[0315] Optionally, one or more parameters for the SL PRS resource are selected by a physical layer of the first device.

[0316] Optionally, some of the one or more parameters for the SL PRS resource are selected by a higher layer of the first device, and another part of the one or more parameters are selected by a physical layer of the first device.

[0317] Optionally, the parameter among the one or more parameters used to indicate the frequency domain position of the SL PRS resource is selected by the physical layer of the first device, and the other parameters among the one or more parameters except the parameter used to indicate the frequency domain position of the SL PRS resource are selected by the upper layer of the first device; or, the parameter among the one or more parameters associated with side positioning is selected by the upper layer of the first device, and the other parameters among the one or more parameters except the parameter associated with side positioning are selected by the physical layer of the first device.

[0318] Optionally, the parameters associated with side positioning include one or more of the following parameters: the number of time domain resources occupied by the SL PRS resources, and the comb tooth size of the SL PRS sent within the SL PRS resources.

[0319] Optionally, the determining module 2410 may be a processor 2510. The communication device 2400 may further include a transceiver 2530 and a memory 2520, as specifically shown in FIG25 .

[0320] Figure 25 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 25 indicate that the unit or module is optional. Apparatus 2500 may be used to implement the method described in the above method embodiment. Apparatus 2500 may be a chip, a terminal device, or a network device.

[0321] The device 2500 may include one or more processors 2510. The processor 2510 may support the device 2500 to implement the method described in the method embodiment above. The processor 2510 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.

[0322] The apparatus 2500 may further include one or more memories 2520. The memories 2520 store programs that can be executed by the processor 2510, causing the processor 2510 to perform the methods described in the above method embodiments. The memories 2520 may be independent of the processor 2510 or integrated into the processor 2510.

[0323] The apparatus 2500 may further include a transceiver 2530. The processor 2510 may communicate with other devices or chips via the transceiver 2530. For example, the processor 2510 may transmit and receive data with other devices or chips via the transceiver 2530.

[0324] 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.

[0325] 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.

[0326] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0338] 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.

[0339] 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)).

[0340] 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 first device determines a first resource configuration, where the first resource configuration is used to configure a sidelink positioning reference signal SL PRS resource in a resource pool.

2. The method according to claim 1, characterized in that The first resource configuration includes a first parameter, and the first parameter is used to indicate the time domain starting position of the SL PRS resource.

3. The method according to claim 2, characterized in that The first resource configuration also includes one or more of the following parameters: Configuration parameters related to the identification of the SL PRS resource; A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate a resource unit RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource.

4. The method according to claim 2 or 3, characterized in that: The determination of the first resource configuration is related to one or more of the following parameters: The second parameter is used to indicate the time domain resources occupied by the physical sidelink shared channel PSSCH demodulation reference signal DMRS allowed in the resource pool; The third parameter is used to indicate the number of time domain resources not used for physical side feedback channel PSFCH transmission and protection interval in a time domain unit of the resource pool; The fourth parameter is used to indicate the time domain resource where the physical sidelink control channel PSCCH in the resource pool is located.

5. The method according to claim 4, characterized in that Different combinations of the second parameter and the third parameter correspond to different first resource configurations.

6. The method according to claim 4, characterized in that Different second parameters correspond to different first resource configurations.

7. The method according to claim 6, characterized in that The number of time domain resources occupied by the PSSCH DMRS corresponding to the first resource configuration is a minimum value of the number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool.

8. The method according to claim 4 or 6, characterized in that: The SL PRS resources corresponding to the first resource configuration do not include one or more of the following: The time domain resources occupied by the PSSCH DMRS allowed in the resource pool; The time domain resources where the PSCCH in the resource pool is located.

9. The method according to claim 1, characterized in that: The first resource configuration includes one or more of the following parameters: Configuration parameters related to the identification of the SL PRS resource; A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate an RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource; A parameter used to indicate the first time domain resource in a time domain unit that can be used for the SL PRS resource.

10. The method according to claim 9, characterized in that The number of time domain resources occupied by the SL PRS resources is M, The M time domain resources are the last M time domain resources with consecutive indexes in a time domain unit, or, The M time domain resources are M time domain resources with consecutive indexes starting from the time domain resource used to indicate the first time domain resource that can be used for the SL PRS resource in a time domain unit.

11. The method according to claim 10, characterized in that The M time domain resources with consecutive indexes satisfy one or more of the following conditions: The M time domain resources with consecutive indices can be used for PSSCH transmission; The M time domain resources with consecutive indexes do not belong to the time domain resources occupied by the PSSCH DMRS; There is no PSCCH on the M time domain resources with consecutive indexes.

12. The method according to any one of claims 3 to 11, characterized in that: The configuration parameters related to the identifier of the SL PRS resource include one or more of the following: A parameter used to indicate the identifier of the SL PRS resource; A parameter used to indicate the identification starting point of the SL PRS resource.

13. The method according to any one of claims 1 to 12, characterized in that The first resource configuration corresponds to the identification information of the SL PRS resource, and the parameters included in the first resource configuration are determined based on the identification information of the SL PRS resource.

14. The method according to claim 13, characterized in that The identification information of the SL PRS resource is indicated by the SL PRS resource identifier, and the parameters included in the first resource configuration are determined according to one or more of the following: The SL PRS resource identifier; The comb tooth size that can be used by the SL PRS sent in the SL PRS resource; The number of RE offsets that can be used by the SL PRS sent within the SL PRS resource.

15. The method according to claim 13 or 14, characterized in that The parameters included in the first resource configuration include one or more of the following parameters: A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate an RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource.

16. The method according to any one of claims 1 to 15, characterized in that The first resource configuration is determined based on one or more of the following information: configuration information of the resource pool; positioning requirement information of the terminal device; identification information of the SL PRS resource.

17. The method according to any one of claims 1 to 16, characterized in that The time domain resources occupied by the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, and at least one OFDM symbol of the one or more OFDM symbols is included in different SL PRS resource configurations.

18. The method according to any one of claims 1 to 17, characterized in that The first device includes one or more of the following: a terminal device, a positioning server.

19. The method according to claim 18, characterized in that The first device is a terminal device, and the method further includes: The first device selects SL PRS resources in the resource pool according to the first resource configuration.

20. The method according to claim 19, characterized in that One or more parameters for the SL PRS resources are selected by a physical layer of the first device.

21. The method according to claim 19, characterized in that Some parameters among the one or more parameters for the SL PRS resources are selected by the higher layer of the first device, and another part of the one or more parameters are selected by the physical layer of the first device.

22. The method according to claim 21, characterized in that The parameter for indicating the frequency domain position of the SL PRS resource among the one or more parameters is selected by the physical layer of the first device, and other parameters among the one or more parameters except the parameter for indicating the frequency domain position of the SL PRS resource are selected by the higher layer of the first device; or, The parameter associated with the sideline positioning among the one or more parameters is selected by a high layer of the first device, and the other parameters among the one or more parameters except the parameter associated with the sideline positioning are selected by a physical layer of the first device.

23. The method according to claim 22, characterized in that The parameters associated with the sideline positioning include one or more of the following parameters: the number of time domain resources occupied by the SL PRS resources, and the comb tooth size of the SL PRS sent within the SL PRS resources.

24. A communication device, characterized in that: The communication device is a first device, and the communication device includes: The determination module is used to determine a first resource configuration, where the first resource configuration is used to configure a sidelink positioning reference signal SL PRS resource in a resource pool.

25. The communication device according to claim 24, characterized in that The first resource configuration includes a first parameter, and the first parameter is used to indicate the time domain starting position of the SL PRS resource.

26. The communication device according to claim 25, characterized in that The first resource configuration also includes one or more of the following parameters: Configuration parameters related to the identification of the SL PRS resource; A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate a resource unit RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource.

27. The communication device according to claim 25 or 26, characterized in that: The determination of the first resource configuration is related to one or more of the following parameters: The second parameter is used to indicate the time domain resources occupied by the physical sidelink shared channel PSSCH demodulation reference signal DMRS allowed in the resource pool; The third parameter is used to indicate the number of time domain resources not used for physical side feedback channel PSFCH transmission and protection interval in a time domain unit of the resource pool; The fourth parameter is used to indicate the time domain resource where the physical sidelink control channel PSCCH in the resource pool is located.

28. The communication device according to claim 27, characterized in that Different combinations of the second parameter and the third parameter correspond to different first resource configurations.

29. The communication device according to claim 27, characterized in that Different second parameters correspond to different first resource configurations.

30. The communication device according to claim 29, characterized in that The number of time domain resources occupied by the PSSCH DMRS corresponding to the first resource configuration is a minimum value of the number of time domain resources occupied by the PSSCH DMRS allowed in the resource pool.

31. The communication device according to claim 27 or 29, characterized in that: The SL PRS resources corresponding to the first resource configuration do not include one or more of the following: The time domain resources occupied by the PSSCH DMRS allowed in the resource pool; The time domain resources where the PSCCH in the resource pool is located.

32. The communication device according to claim 24, characterized in that The first resource configuration includes one or more of the following parameters: Configuration parameters related to the identification of the SL PRS resource; A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate an RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource; A parameter used to indicate the first time domain resource in a time domain unit that can be used for the SL PRS resource.

33. The communication device according to claim 32, characterized in that The number of time domain resources occupied by the SL PRS resources is M, The M time domain resources are the last M time domain resources with consecutive indexes in a time domain unit, or, The M time domain resources are M time domain resources with consecutive indices starting from the time domain resource indicated by the parameter used to indicate the first time domain resource that can be used for the SL PRS resource within a time domain unit.

34. The communication device according to claim 33, characterized in that The M time domain resources with consecutive indexes satisfy one or more of the following conditions: The M time domain resources with consecutive indices can be used for PSSCH transmission; The M time domain resources with consecutive indexes do not belong to the time domain resources occupied by the PSSCH DMRS; There is no PSCCH on the M time domain resources with consecutive indexes.

35. The communication device according to any one of claims 26 to 34, characterized in that: The configuration parameters related to the identifier of the SL PRS resource include one or more of the following: A parameter used to indicate the identifier of the SL PRS resource; A parameter used to indicate the identification starting point of the SL PRS resource.

36. The communication device according to any one of claims 24 to 35, characterized in that: The first resource configuration corresponds to the identification information of the SL PRS resource, and the parameters included in the first resource configuration are determined based on the identification information of the SL PRS resource.

37. The communication device according to claim 36, characterized in that The identification information of the SL PRS resource is indicated by the SL PRS resource identifier, and the parameters included in the first resource configuration are determined according to one or more of the following: The SL PRS resource identifier; The comb tooth size that can be used by the SL PRS sent in the SL PRS resource; The number of RE offsets that can be used by the SL PRS sent within the SL PRS resource.

38. The communication device according to claim 36 or 37, characterized in that: The parameters included in the first resource configuration include one or more of the following parameters: A parameter used to indicate the comb tooth size of the SL PRS sent in the SL PRS resource; A parameter used to indicate an RE offset of a SL PRS sent within the SL PRS resource; A parameter used to indicate the number of time domain resources occupied by the SL PRS resource.

39. The communication device according to any one of claims 24 to 38, characterized in that: The first resource configuration is determined based on one or more of the following information: configuration information of the resource pool; positioning requirement information of the terminal device; identification information of the SL PRS resource.

40. The communication device according to any one of claims 24 to 39, characterized in that: The time domain resources occupied by the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, and at least one OFDM symbol of the one or more OFDM symbols is included in different SL PRS resource configurations.

41. The communication device according to any one of claims 24 to 40, characterized in that: The first device includes one or more of the following: a terminal device, a positioning server.

42. The communication device according to claim 41, characterized in that The first device is a terminal device, and the communication device further includes: A selection module is configured to select SL PRS resources in the resource pool according to the first resource configuration.

43. The communication device according to claim 42, characterized in that One or more parameters for the SL PRS resources are selected by a physical layer of the first device.

44. The communication device according to claim 42, characterized in that Some parameters among the one or more parameters for the SL PRS resources are selected by the higher layer of the first device, and another part of the one or more parameters are selected by the physical layer of the first device.

45. The communication device according to claim 44, characterized in that The parameter for indicating the frequency domain position of the SL PRS resource among the one or more parameters is selected by the physical layer of the first device, and other parameters among the one or more parameters except the parameter for indicating the frequency domain position of the SL PRS resource are selected by the higher layer of the first device; or, The parameter associated with the sideline positioning among the one or more parameters is selected by a high layer of the first device, and the other parameters among the one or more parameters except the parameter associated with the sideline positioning are selected by a physical layer of the first device.

46. ​​The communication device according to claim 45, characterized in that The parameters associated with the sideline positioning include one or more of the following parameters: the number of time domain resources occupied by the SL PRS resources, and the comb tooth size of the SL PRS sent within the SL PRS resources.

47. A communication device, characterized in that: The device comprises 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 so that the communication device executes the method according to any one of claims 1 to 23.

48. 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 23.

49. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 23.

50. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 23.

51. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 23.

52. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 23.

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