Lateral transmission method and terminal equipment

Abstract

The invention provides a sideline transmission method and terminal equipment. The method comprises the following steps: the terminal equipment sends or receives a first sideline positioning reference signal in a first resource pool; wherein the first resource pool is one of the following: a special resource pool of a sideward positioning reference signal; and a shared resource pool of side positioning reference signals and side data channels.

Description

Side transmission method and terminal device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a sideline transmission method and terminal equipment. Background Art

[0002] The sidelink positioning reference signal (SL PRS) can be transmitted in a dedicated resource pool for the SL PRS or in a shared resource pool for the SL PRS and the sidelink data channel. How to indicate the transmission resource of the SL PRS in the shared resource pool or the dedicated resource pool is an unresolved issue.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a side transmission method and a terminal device. The following describes in detail various aspects of the embodiments of the present application.

[0005] In a first aspect, a sidelink transmission method is provided, comprising: a terminal device sending or receiving a first sidelink positioning reference signal in a first resource pool; wherein the first resource pool is one of the following: a dedicated resource pool for the sidelink positioning reference signal; and a shared resource pool for the sidelink positioning reference signal and the sidelink data channel.

[0006] According to a second aspect, a terminal device is provided, comprising: a communication module for sending or receiving a first sidelink positioning reference signal in a first resource pool; wherein the first resource pool is one of the following: a dedicated resource pool for the sidelink positioning reference signal; and a shared resource pool for the sidelink positioning reference signal and the sidelink data channel.

[0007] In a third aspect, a terminal device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal device executes the method described in the first aspect.

[0008] In a fourth aspect, a device is provided, comprising a processor configured to call a program from a memory so that the device executes the method described in the first aspect.

[0009] In a fifth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect.

[0010] In a sixth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect.

[0011] In a seventh aspect, a computer program product is provided, characterized in that it includes a program, and the program enables a computer to execute the method described in the first aspect.

[0012] In an eighth aspect, a computer program is provided, which enables a computer to execute the method as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] FIG2 is an example diagram of a physical sidelink control channel (PSCCH) and a physical sidelink control channel (PSSCH) resource pool.

[0015] FIG3 is a schematic diagram of the structure of a time slot in a new radio (NR) system.

[0016] FIG4 is a diagram illustrating an example of a resource selection process in the second resource selection mode.

[0017] FIG5 is a diagram illustrating an example of resources for transmitting a downlink positioning reference signal (DL PRS).

[0018] FIG6 is a schematic diagram of the structure of an interleaved resource block.

[0019] FIG7 is an example diagram of a frame structure of a sidelink over unlicensed spectrum (SL-U) system.

[0020] FIG8 is a diagram illustrating an example of a resource block (RB) set.

[0021] FIG9 is a flow chart of the side transmission method provided in an embodiment of the present application.

[0022] FIG10 is an example diagram of the association relationship between PSCCH resources and SL PRS resources provided by an embodiment of the present application.

[0023] FIG11 is an example diagram of the association relationship between PSCCH resources and SL PRS resources provided in another embodiment of the present application.

[0024] FIG12 is an example diagram of the association relationship between PSCCH resources and SL PRS resources provided in another embodiment of the present application.

[0025] FIG13 is a schematic diagram of the structure of the terminal device provided in an embodiment of the present application.

[0026] FIG14 is a schematic diagram of the structure of the device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solution in this application will be described below with reference to the accompanying drawings.

[0028] Communication system architecture

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0037] 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.

[0038] 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).

[0039] Determination of NR-V2X frequency domain resources

[0040] Similar to LTE-V2X, the frequency domain resources of the NR-V2X resource pool can be continuous, and the frequency domain resource allocation granularity can be sub-channels. Typically, a sub-channel includes a number of physical resource blocks (PRBs) {10, 12, 15, 20, 50, 75, 100}, of which the minimum sub-channel size is 10 PRBs, which is much larger than the minimum sub-channel size of 4 PRBs in LTE-V2X. This is mainly because the frequency domain resources of the PSCCH in NR-V2X are located in the first sub-channel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a PSSCH sub-channel, while the time domain resources of the PSCCH occupy two or three orthogonal frequency division multiplexing (OFDM) symbols. If the sub-channel size is configured too small, the available PSCCH resources will be limited, the bit error rate will increase, and the detection performance of the PSCCH will be reduced. In NR-V2X, the size of the PSSCH subchannel and the frequency domain resource size of the PSCCH are configured independently, but usually the frequency domain resource of the PSCCH is less than or equal to the subchannel size of the PSSCH.

[0041] 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 resource block (RB) index (sl-StartRB-Subchannel), number of PRBs (sl-RB-Number), and PSCCH frequency domain resource indication (sl-FreqResourcePSCCH).

[0042] 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.

[0043] The above-mentioned number of sub-channels may indicate the number of sub-channels included in the resource pool.

[0044] The above sub-channel starting RB index may indicate the starting PRB index of the first sub-channel in the resource pool.

[0045] The above-mentioned PRB number may indicate the number of consecutive PRBs included in the resource pool.

[0046] 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.

[0047] 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.

[0048] 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 2 shows a schematic diagram of the PSCCH and PSSCH resource pool.

[0049] 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 scheduled transmission, frequency domain resource allocation, time domain resource allocation, PSSCH reference signal pattern, second-order sidelink control information (SCI) format, second-order SCI code rate offset, number of PSSCH demodulation reference signal (DMRS) ports, modulation and coding scheme (MCS), MCS table indication, number of physical sidelink feedback channel (PSFCH) symbols, resource reservation period, reserved bits, etc.

[0050] 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.

[0051] The time domain resource allocation is used to indicate the time domain positions of up to two retransmission resources.

[0052] 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.

[0053] Reserved bits, usually 2 to 4 bits. The specific number of bits can be configured or pre-configured by the network.

[0054] 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.

[0055] Determination of NR-V2X time domain resources (time slots)

[0056] 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).

[0057] 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.

[0058] Figure 3 shows a schematic diagram of the timeslot structure in an NR system. As shown in Figure 3, 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.

[0059] Currently, the sidelink transmission system can share a carrier with the cellular system. In this case, the sidelink transmission can only use the uplink transmission resources of the cellular system. For NR-V2X, if the sidelink transmission is still required to occupy all the time domain symbols in a time slot, the network needs to configure a time slot full of uplink symbols for sidelink transmission, which will have a great impact on the uplink and downlink data transmission of the NR system and reduce the performance of the system. Therefore, in NR-V2X, part of the time domain symbols in the time slot are supported for sidelink transmission, that is, part of the uplink symbols in a time slot are used for sidelink transmission. In addition, considering that the sidelink transmission includes automatic gain control (AGC) symbols and guard period (GP) symbols, if the number of uplink symbols available for sidelink transmission is small, after removing the AGC symbols and GP symbols, the remaining symbols available for transmitting valid data are even fewer, and the resource utilization rate is very low. Therefore, the time domain symbols occupied by the sidelink transmission in NR-V2X are at least 7 (including GP symbols). When the sideline transmission system uses a dedicated carrier, there is no problem of sharing transmission resources with other systems, and all symbols in the time slot can be configured to be used for sideline transmission.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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

[0066] 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.

[0067] 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.

[0068] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0069] 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. r (0≤r<10240×2 μ -N S_SSB -N nonSL )satisfy Then the time slot is a reserved time slot.

[0070] Among them, N reserved =(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.

[0071] 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.

[0072] 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 -M S_SSB -N nonSL -N reserved .

[0073] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0074] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set (0≤k<(10240×2 μ -N S_SSB -N nonSL -N reserved )), when b is satisfied k′ =1, the time slot belongs to the resource pool, where k′=k mod L bitmap .

[0075] Step 5: renumber the time slots belonging to the resource pool determined in step 4 into i∈{0,1,…,T′ max -1}, where T′ max Indicates the number of time slots included in the resource pool.

[0076] Second resource selection mode in NR SL:

[0077] The second resource selection mode may also be referred to as resource allocation mode 2. In resource allocation mode 2, the terminal device's upper layers may request the terminal device's physical layer to determine a resource subset. The terminal device's upper layers may then select resources for PSSCH / PSCCH transmission from the resource subset determined by the physical layer.

[0078] If you want to trigger the above resource selection process, then in time slot n, the upper layer of the terminal device can provide the following parameters related to PSSCH / PSCCH transmission to the physical layer: the resource pool of the resource subset; the physical layer priority (prio TX); remaining packet delay budget (remaining PDB); number of subchannels used for PSSCH / PSCCH transmission in a time slot (L subCH ).

[0079] Optionally, the upper layer of the terminal device may also provide a resource reservation period (P rsvp_TX The resource reservation period is usually expressed in milliseconds (ms).

[0080] The following parameters configured by higher layers may also affect the resource subset determination process: sl-SelectionWindowList, sl-ThresPSSCH-RSRP-List, sl-RS-ForSensing, sl-ResourceReservePeriodList, sl-SensingWindow, sl-TxPercentageList, and sl-PreemptionEnable.

[0081] The sl-SelectionWindowList in the above parameters can be used to configure the TX T 2min The minimum value of T 2min Can be set to sl-SelectionWindowList for prio TX The configured value.

[0082] The sl-ThresPSSCH-RSRP-List in the above parameters can be used to configure each (p i ,p j ) combination corresponding to the reference signal receiving power (RSRP) threshold, where p i is the priority indicated in the received SCI, p j =prio TX .

[0083] The sl-RS-ForSensing parameter in the above parameters can be used to instruct the terminal device to use the PSSCH-RSRP or PSCCH-RSRP measurement results for resource exclusion.

[0084] The sl-ResourceReservePeriodList parameter in the above parameters may be used to indicate the resource reservation period available in the resource pool.

[0085] The sl-SensingWindow parameter in the above parameters may be used to indicate the starting point T0 of the resource listening window, where T0 may be defined as the number of time slots corresponding to the sl-SensingWindow (in milliseconds).

[0086] The sl-TxPercentageList parameter in the above parameters can be used to configure the remaining resource ratio X after resource exclusion. TX , X can be defined as sl-TxPercentageList(prio TX ).

[0087] The sl-PreemptionEnable parameter in the above parameters can be used to indicate whether resource preemption (pre-emption) is activated in the resource pool, and if resource preemption is activated, the resource preemption priority prio pre The value of .

[0088] If the upper layer of the terminal device provides a resource reservation period P rsvp_TX , then P rsvp_TX Converted to the number of logical time slots P′ rsvp_TX .

[0089] As shown in FIG4 , the step of determining the resource subset by the physical layer of the terminal device may include steps 1) to 7) below.

[0090] Step 1) Define candidate single-slot resources R for transmission x,y Time slot Continuous L within subCH subchannels. The subchannel index is x+j, j=0,...,L subCH -1. The terminal device assumes that any L in the time range [n+T1,n+T2] subCH A continuous sub-channel corresponds to a single time slot resource.

[0091] T1 in the above time range can satisfy: 0≤T1≤T proc,1 , and the value of T1 can be determined by the terminal equipment. When the subcarrier spacing is 15kHz, 30kHz, 60kHz, and 120kHz, T proc,1 They are 3 time slots, 5 time slots, 9 time slots, and 17 time slots respectively.

[0092] If T 2min is less than the remaining packet delay budget of the data packet in time slots, then T 2min ≤T2≤PDB, and the value of T2 can be determined by the terminal device implementation. Otherwise, T2 is equal to PDB. PDB can be indicated by the upper layer of the terminal device. 2minThe value set of can be {1,5,10,20}×2 μ time slots, where μ = 0, 1, 2, 3 corresponds to the case where the subcarrier spacing is 15kHz, 30kHz, 60kHz, 120kHz. The terminal device can send data based on its priority level. TX Determine T from this value set 2min .

[0093] The total number of candidate single-slot resources is M total .

[0094] Step 2), the resource listening window is defined as The time slots in the range of T0 are as described above. When the subcarrier spacing is 15kHz, 30kHz, 60kHz, or 120kHz, T proc,0 The time slots are 1, 1, 2 and 4 respectively. The terminal device shall monitor the time slots belonging to the sidelink resource pool within the resource listening window unless the terminal device performs a transmission operation on a certain time slot.

[0095] Step 3), set the parameter Th(p i ,p j ) is set to the i-th value of the sl-ThresPSSCH-RSRP-List configuration, where i = p i +(p j -1)*8.

[0096] Step 4), set S A Initialized to all candidate single-slot resources.

[0097] Step 5), if the following conditions are met, the terminal device should exclude S A Candidate resources R x,y :

[0098] Condition 1: The terminal device does not listen to the time slot in 2)

[0099] Condition 2: For the number P of logical time slots corresponding to any resource reservation period allowed in the resource pool configured by sl-ResourceReservePeriodList, y=m+P.

[0100] Step 6), if the following conditions are met, the terminal device should exclude S A Candidate resources R x,y :

[0101] Condition 1: The terminal device is in the time slot Receive SCI format 1-A, in which the 'Resource reservation period' field (if present) and the 'Priority' field indicate P rsvp_RX and prio RX ;

[0102] Condition 2: The RSRP measured for the received SCI is higher than Th(prio RX ,prio TX );

[0103] Condition 3: In the time slot The received SCI format 1-A indicates the reserved PSSCH resources and If the received SCI format 1-A contains the 'Resource reservation period' field, it is assumed that the time slot The received SCI indicates the same format and reserved resources as Overlap. Where q=1,2,…,Q,j=0,1,…,C resel-1 Here, P′ rsvp_RX It is from P rsvp_RX The number of logical time slots converted. rsvp_RX <T scal And n′-m≤P′ rsvp_RX , where if time slot n belongs to the set otherwise The first one after time slot n time slot; otherwise Q=1. T scal is the value in milliseconds converted from T2. resel is the number of PSSCH transmission opportunities to be selected. Indicates the set of logical time slots contained in the current resource pool.

[0104] Step 7), if the set S A The number of single-slot resources remaining in the time slot is less than X·M total , then the terminal device will Th(p i ,p j ) by 3dB and proceed to step 4).

[0105] The physical layer of the terminal equipment will be S A Report to the MAC layer.

[0106] Downlink-based positioning

[0107] 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.

[0108] 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".

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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").

[0114] 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. Under different subcarrier spacing conditions, the configurable DL PRS transmission period value range can be the same. Figure 5 shows a schematic diagram of resources for transmitting DL PRS when the comb size is 2 and the resource element (RE) offset is 0 and 1 respectively.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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").

[0121] 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.

[0122] 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.

[0123] 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.

[0124] The QCL information of the DL PRS is used to indicate the QCL information of the DL PRS.

[0125] SL-U

[0126] 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, ...}.

[0127] Figure 6 shows a schematic diagram of the interleaved resource block structure. As shown in Figure 6, 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 Figure 6 represent the IRB index.

[0128] 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 7 shows an example of the frame structure of the SL-U system, where the time slot only includes the PSCCH and PSSCH, but not the PSFCH. As shown in Figure 7, 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 7, the system configures the PSCCH to occupy one IRB resource and two 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 7, PSSCH 1 occupies IRB #0 and IRB #1, and its corresponding PSCCH 1 occupies IRB #0. PSSCH 2 occupies IRB #2, and its corresponding PSCCH 2 also occupies IRB #2. It should be noted that, for simplicity, FIG7 does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0129] 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 8.

[0130] 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.

[0131] Sidelink-based positioning

[0132] 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.

[0133] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies on 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] Standardization work 4: Standardize the open-loop power control mechanism of SL PRS transmission, etc.

[0138] As mentioned above, SL PRS can be transmitted in a dedicated resource pool for SL PRS or in a shared resource pool for SL PRS and a sidelink data channel (such as PSSCH). How to indicate the transmission resources and / or transmission mode of SL PRS in the shared resource pool or dedicated resource pool is an unresolved issue.

[0139] The embodiments of the present application are described in detail below with examples.

[0140] The embodiments of the present application can be applied to both licensed spectrum and unlicensed spectrum.

[0141] The SL PRS resource mentioned in the embodiment of the present application may refer to a time-frequency resource used for SL PRS transmission within a time slot.

[0142] In some embodiments, a SL PRS resource may include one or more of the following features: an identification (ID) of the SL PRS resource, the comb tooth size and 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 number of consecutive OFDM symbols occupied, and the RB occupied by the SL PRS resource in the above-mentioned OFDM symbol.

[0143] In some embodiments, SL PRS resources within a resource pool may be determined based on configuration information of a network device.

[0144] In some embodiments, SL PRS resources within a resource pool may be determined based on pre-configuration information.

[0145] In some embodiments, the configuration information or pre-configuration information of the network device may indicate all of the above characteristics of the SL PRS resource.

[0146] In some embodiments, the configuration information or pre-configuration information of the network device may indicate some of the above-mentioned features of the SL PRS resource. As an example, the configuration information or pre-configuration information of the network device may indicate the ID of the SL PRS resource, the comb tooth size and RE offset of the SL PRS sent within the SL PRS resource, and the starting OFDM symbol of the SL PRS resource in the time slot and the number of consecutive OFDM symbols occupied, but does not explicitly indicate the RB occupied by the SL PRS resource. In this case, the RB occupied by the SL PRS resource may be the same as the RB configured in the resource pool.

[0147] FIG9 is a schematic flow chart of a sidelink transmission method according to an embodiment of the present application. Referring to FIG9 , in step S910, a terminal device sends or receives a first SL PRS in a first resource pool. The first resource pool may be a dedicated resource pool for the SL PRS or a shared resource pool for the SL PRS and a sidelink data channel (e.g., PSSCH).

[0148] Example 1: The first resource pool is a dedicated resource pool for SL PRS

[0149] In some embodiments, one or more PSCCH resources may be configured / pre-configured on a time slot within a dedicated resource pool of the SL PRS.

[0150] In some embodiments, one or more SL PRS resources may be configured / pre-configured on a time slot within a dedicated resource pool for SL PRS.

[0151] In some embodiments, for a PSCCH-carried SCI sent on a PSCCH resource in a time slot, the SCI schedules the SL PRS resource associated with the PSCCH resource in the time slot. In other words, the SCI schedules the SL PRS sent on the SL PRS resource associated with the PSCCH resource in the time slot.

[0152] In some embodiments, a time slot may include one or more OFDM symbol groups. An OFDM symbol group may include multiple consecutive OFDM symbols within a time slot. An OFDM symbol group may include one or more SL PRS resources. For example, an OFDM symbol group may include one SL PRS resource. For another example, an OFDM symbol group may include multiple PRS resources at different frequency domain locations.

[0153] In some embodiments, IDs of SL PRS resources within a time slot of the first resource pool may be consecutive.

[0154] In some embodiments, the IDs of SL PRS resources within one OFDM symbol group may be consecutive.

[0155] In some embodiments, there may be a one-to-one mapping relationship between the PSCCH resources and the SL PRS resources in the first resource pool.

[0156] In some embodiments, there may be a one-to-many mapping relationship between PSCCH resources and SL PRS resources in the first resource pool.

[0157] In some embodiments, there may be a many-to-one mapping relationship between PSCCH resources and SL PRS resources in the first resource pool.

[0158] Example 1.1: There is a one-to-one mapping relationship between PSCCH resources and SL PRS resources in the first resource pool

[0159] In some embodiments, the PSCCH resources and SL PRS resources in a time slot of the first resource pool each correspond to an ID, and the mutually associated PSCCH resources and SL PRS resources are associated with the same ID.

[0160] In some embodiments, SL PRS resources that are not mapped to PSCCH resources cannot be used.

[0161] In some embodiments, the value range of the PSCCH resource ID of the first resource pool is the same as the value range of the SL PRS resource ID.

[0162] For example, referring to Figure 10, four PSCCH resources are configured in one time slot, and the IDs of the four PSCCH resources are #0 to #3, respectively. The time slot is also configured with three OFDM symbol groups, and the three OFDM symbol groups correspond to OFDM symbols 4 to 6, OFDM symbols 8 to 9, and OFDM symbols 11 to 12, respectively. Two SL PRS resources with different RE offsets are configured in the first OFDM symbol group, and one SL PRS resource is configured in each of the other two OFDM symbol groups, for a total of four SL PRS resources. The IDs of the four SL PRS resources are #0 to #3, respectively. In the example shown in Figure 10, PSCCH resource #0 is associated with SL PRS resource #0, PSCCH resource #1 is associated with SL PRS resource #1, PSCCH resource #2 is associated with SL PRS resource #2, and PSCCH resource #3 is associated with SL PRS resource #3.

[0163] Example 1.2: One PSCCH resource in the first resource pool is associated with one or more SL PRS resources

[0164] In some embodiments, the PSCCH resources and SL PRS resources in a time slot of the first resource pool may each correspond to an ID, and the value ranges corresponding to the ID of the PSCCH resources and the ID of the SL PRS resources in a time slot of the first resource pool may be different.

[0165] In some embodiments, the first SL PRS is carried in a first SL PRS resource in a first time slot, and the first time slot also includes a first PSCCH resource associated with the first SL PRS resource. The first PSCCH resource carries an SCI, and the SCI is used to schedule the first SL PRS resource (or schedule the SL PRS on the first SL PRS resource).

[0166] In some embodiments, the SCI may include a first bit field. The first bit field may be used to indicate the first SL PRS resource. For example, the decimal value represented by the first bit field may represent the SL PRS resource ID associated with the PSCCH scheduled by the SCI.

[0167] In some embodiments, the number of bits of the first bit field may be associated with a first quantity. The first quantity may be determined based on the number of SL PRS resources associated with the first PSCCH resource. For example, the first quantity may be equal to the number of SL PRS resources associated with the first PSCCH resource. For example, the number of SL PRS resources associated with the first PSCCH resource is D, with indexes of 0, 1, ..., D-1, respectively.

[0168] In some embodiments, the number of bits in the first bit field may be based on OK, among them Indicates rounding up, D indicates that the number of SL PRS resources associated with the first PSCCH resource is D, and the indexes of the D SL PRS resources can be 0, 1, ..., D-1 respectively. As an example, the number of bits in the first bit field can be equal to

[0169] For example, referring to Figure 11, it is assumed that the first PSCCH resource is PSCCH resource #0 in Figure 11. As can be seen from Figure 11, PSCCH resource #0 is associated with two SL PRS resources, namely SL PRS resource #0 and SL PRS resource #1. The number of bits in the first bit field in the SCI sent on the PSCCH resource #0 can be 1. If the value of this 1 bit is 0, it indicates that the SL PRS resource indicated by the first bit field is SL PRS resource #0; if the value of this 1 bit is 1, it indicates that the SL PRS resource indicated by the first bit field is SL PRS resource #1.

[0170] In some embodiments, SL PRS resource IDs within the same OFDM symbol group are consecutive (ie, consecutively numbered).

[0171] In some embodiments, during the resource selection process (corresponding to the second resource selection mode), the terminal device first selects a target SL PRS resource, and then selects a PSCCH resource associated with the target SL PRS resource.

[0172] In some embodiments, during the resource selection process of the terminal device, if one SL PRS resource among multiple SL PRS resources associated with the same PSCCH resource is excluded (such as because it is occupied by other terminal devices), the terminal device also excludes other SL PRS resources among the multiple SL PRS resources.

[0173] In some embodiments, the terminal device first selects a PSCCH resource. Then, the terminal device can select a target SL PRS resource (for SL PRS transmission) from one or more SL PRS resources associated with the PSCCH resource. As an example, the terminal device can randomly select an SL PRS resource from one or more SL PRS resources associated with the PSCCH resource as the target SL PRS resource.

[0174] Example 1.2.1: The number of PSCCH resources in a time slot of the first resource pool is greater than or equal to the number of OFDM symbol groups in the time slot

[0175] In some embodiments, each SL PRS resource can be uniquely associated with a PSCCH resource. Furthermore, in some embodiments, the PSCCH resource ID associated with each SL PRS resource can be indicated by the configuration information or pre-configuration information of the network device. In order to avoid collisions between the PSCCHs corresponding to the time-division multiplexed SL PRS resources, the PSCCH resources associated with the SL PRS resources in different OFDM symbols can be different.

[0176] In some embodiments, each PSCCH resource is associated with one or more SL PRS resources. For example, a first resource pool may include a first PSCCH resource, and the first PSCCH resource is associated with multiple SL PRS resources. In other words, there is a one-to-many association relationship between the PSCCH resources and the SL PRS resources in the first resource pool.

[0177] In some embodiments, each PSCCH resource within the first resource pool is associated with one or more SL PRS resources within an OFDM symbol group.

[0178] In some embodiments, each PSCCH resource in the first resource pool is associated with at most one or more SL PRS resources in a group of OFDM symbols.

[0179] For example, referring to Figure 12, three PSCCH resources are configured in a time slot, and the IDs of the three PSCCH resources are #0 to #2 respectively. The time slot is also configured with three OFDM symbol groups, and the three OFDM symbol groups correspond to OFDM symbols 4 to 6, OFDM symbols 8 to 9, and OFDM symbols 11 to 12 respectively. Two SL PRS resources with different RE offsets are configured in the first OFDM symbol group, and one SL PRS resource is configured in each of the other two OFDM symbol groups, for a total of four SL PRS resources. The IDs of the four SL PRS resources are #0 to #3 respectively. In the example shown in Figure 12, PSCCH resource #0 is associated with SL PRS resource #0 and SL PRS resource #1, PSCCH resource #1 is associated with SL PRS resource #2, and PSCCH resource #2 is associated with SL PRS resource #3.

[0180] Example 1.2.2: The number of PSCCH resources in one time slot of the first resource pool is equal to the number of OFDM symbol groups in the one time slot

[0181] In some embodiments, each PSCCH resource in a time slot of the first resource pool is associated with an OFDM symbol group in the time slot. That is, each OFDM symbol group can be uniquely associated with a PSCCH resource; correspondingly, a PSCCH resource can be uniquely associated with an OFDM symbol group.

[0182] For example, referring to Figure 11, three PSCCH resources are configured in a time slot, and the IDs of the three PSCCH resources are #0 to #2 respectively. The time slot is also configured with three OFDM symbol groups, and the three OFDM symbol groups correspond to OFDM symbols 4 to 6, OFDM symbols 8 to 9, and OFDM symbols 11 to 12 respectively. Two SL PRS resources with different RE offsets are configured in the first OFDM symbol group, the second OFDM symbol group, and the third OFDM symbol group, for a total of six SL PRS resources. The IDs of the six SL PRS resources are #0 to #5 respectively. In the example shown in Figure 11, PSCCH resource #0 is associated with the first OFDM symbol group, PSCCH resource #1 is associated with the second OFDM symbol group, and PSCCH resource #2 is associated with the third OFDM symbol group.

[0183] Embodiment 1.3: The first resource pool includes a second SL PRS resource, and the second SL PRS resource is associated with one or more PSCCH resources

[0184] In some embodiments, during the resource selection process (corresponding to the second resource selection mode), the terminal device may first select the second SL PRS resource, and then select the target PSCCH resource from one or more PSCCH resources associated with the second SL PRS resource. For example, the terminal device may randomly select an SL PRS resource from one or more PSCCH resources associated with the second SL PRS resource as the target PSCCH resource.

[0185] In some embodiments, if the first resource selection mode (ie, the resource selection mode based on network device scheduling) is adopted, the network device may indicate the scheduled SL PRS resource and a PSCCH resource associated with the SL PRS resource.

[0186] The foregoing text, in conjunction with Examples 1.1 to 1.3, provides detailed examples of the association relationship between SL PRS resources and PSCCH resources. For an SCI carried by a PSCCH sent on a PSCCH resource, the SL PRS sent on the SL PRS resource associated with the PSCCH resource in the current time slot can be scheduled. In addition, in some embodiments, the SCI may further indicate one or more SL PRS resources located in different time slots, and the one or more SL PRS resources located in different time slots may be used for the retransmission of the SL PRS in the current time slot, that is, the one or more SL PRS resources located in different time slots are the retransmission resources of the SL PRS in the current time slot. It should be understood that the indication method of the retransmission resources described below can be applied to any embodiment in Example 1 (such as Example 1.1, Example 1.2, or Example 1.3).

[0187] In some embodiments, the first SL PRS may be carried in the first SL PRS resource in the first time slot. The first time slot may also include a first PSCCH resource associated with the first SL PRS resource. The first PSCCH resource carries an SCI, and the SCI can be used to schedule the first SL PRS resource. The SCI includes a second bit field, and the second bit field can be used to indicate a third SL PRS resource (the second bit field can indicate one SL PRS resource or multiple SL PRS resources. If the second bit field indicates multiple SL PRS resources, the third SL PRS resource can be any one of the multiple SL PRS resources). The time slot where the third SL PRS resource is located is the second time slot (a different time slot from the first time slot), and the third SL PRS resource is a retransmission resource of the first SL PRS (or, the third SL PRS resource is used to retransmit the first SL PRS).

[0188] There are many ways for the SCI to indicate the third SL PRS resource based on the second bit field. Three possible implementations are given below.

[0189] Method 1:

[0190] The third SL PRS resource is associated with the same ID as the first SL PRS resource. That is, the same SL PRS (the initially transmitted and retransmitted SL PRSs can be considered the same SL PRS) can occupy SL PRS resources with the same ID in different time slots.

[0191] In some embodiments, the second bit field may only indicate the time slot where the retransmission resource of the first SL PRS is located. This indication method can greatly reduce the number of bits in the SCI.

[0192] Method 2:

[0193] The first SL PRS resource and the third SL PRS resource both correspond to the first OFDM symbol group in a time slot. For example, the first SL PRS resource and the third SL PRS resource may correspond to resources with different RE offsets in the first OFDM symbol group.

[0194] In some embodiments, the second bit field may be used to indicate the second time slot (i.e., the time slot in which the third SL PRS resource is located) and a first offset value (or ID offset value). The first offset value may be used to determine the ID of the third SL PRS resource. For example, the first offset value may be an offset value of the ID of the third SL PRS resource relative to the target ID.

[0195] The target ID may be the ID of a certain SL PRS resource in the first OFDM symbol group. For example, the target ID may be the minimum ID of the SL PRS resources in the first OFDM symbol group. For another example, the target ID may be the maximum ID of the SL PRS resources in the first OFDM symbol group.

[0196] In some embodiments, the second bit field may include a third bit field. The third bit field may be used to carry the first offset value mentioned above. To avoid blind detection of the PSCCH, the number of bits in the third bit field may be associated with the maximum number of SL PRS resources contained in an OFDM symbol group in a time slot in the first resource pool.

[0197] In some embodiments, the number of bits in the third bit field may be based on OK, among them Indicates rounding up, A indicates the maximum number of SL PRS resources contained in an OFDM symbol group in a time slot in the first resource pool, and R indicates the number of retransmission resources indicated by the SCI (or the number of SL PRS in different time slots additionally indicated by the SCI). For example, the number of bits in the third bit field can be equal to

[0198] For example, in Figure 10, assuming that the first SL PRS resource is SL PRS resource #0 in Figure 10, and SL PRS resource #0 is located in the first OFDM symbol group of three OFDM symbol groups (including OFDM symbols 4 to 6), the third SL PRS resource can only use the resources in the first OFDM symbol group, that is, SL PRS resource #0 or SL PRS resource #1. In addition, in the example of Figure 10, the maximum number A of SL PRS resources included in an OFDM symbol group in a time slot is 2. If the number R of SL PRS resources in different time slots additionally indicated by the SCI is 2, the third bit field contains bits. The first bit of the two bits corresponds to the ID offset value corresponding to the first SL PRS resource additionally indicated by the SCI, and the second bit corresponds to the ID offset corresponding to the second SL PRS resource additionally indicated by the SCI. For any of the above two bits, if the value of the bit is 0, it means that the SL PRS resource ID indicated by the bit is #0; if the value of the bit is 1, it means that the SL PRS resource ID indicated by the bit is #1.

[0199] In some embodiments, SL PRS resource IDs within the same OFDM symbol group are consecutive.

[0200] Compared with method 1, method 2 allows the terminal device to select SL PRS resources more flexibly. At the same time, method 2 can reduce the number of bits of resource indication to a certain extent.

[0201] Method 3:

[0202] The third SL PRS resource may be any SL PRS resource in a time slot. That is, the same SL PRS may occupy different SL PRS resources in retransmission. For example, the same SL PRS may occupy SL PRS resources in the same or different OFDM symbol groups in retransmission.

[0203] In some embodiments, the second bit field is used to indicate one or more of the following: the second time slot; and the ID of the third SL PRS resource.

[0204] In some embodiments, the second bit field may include a fourth bit field. The fourth bit field may be used to carry the ID of a fourth SL PRS resource, and the number of bits in the fourth bit field may be associated with the number of SL PRS resources in a time slot in the first resource pool.

[0205] In some embodiments, the number of bits in the fourth bit field may be based on Determine, among which, Indicates rounding up, R indicates the number of retransmission resources indicated by the SCI (or the number of SL PRS resources in different time slots additionally indicated by the SCI), and C indicates the number of SL PRS resources in a time slot of the first resource pool. For example, the number of bits in the fourth bit field can be equal to Each bit in this field The decimal value that the bit can represent can represent the value of the ID of the corresponding SL PRS resource.

[0206] For example, in FIG10 , there are 4 SL PRS resources configured / preconfigured in a time slot, that is, C=4. The third SL PRS resource mentioned above can be any one of the 4 SL PRS resources. If the number of SL PRS resources in different time slots additionally indicated by the SCI is 2, the fourth bit field in the SCI contains The first two bits of the four bits may correspond to the ID of the first SL PRS resource additionally indicated by the SCI, and the last two bits of the four bits may correspond to the ID of the second SL PRS resource additionally indicated by the SCI.

[0207] In some embodiments, the IDs of SL PRS resources within a time slot may be indexed consecutively starting from 0.

[0208] The advantage of mode 3 is that it allows the terminal device to select a SL PRS resource from all SL PRS resources, which can better improve the quality of the selected SL PRS resource.

[0209] Example 2: The first resource pool is a shared resource pool for SL PRS and sidelink data channels (such as PSSCH)

[0210] In some embodiments, the first SL PRS is located in the first SL PRS resource, and the first SL PRS resource is scheduled or indicated based on the second-order SCI. That is, in the shared resource pool, the scheduled SL PRS resource and / or the SL PRS transmission mode can be indicated by the second-order SCI.

[0211] In some embodiments, the first SL PRS may be located in the first time slot, and the second-order SCI of the first time slot may indicate SL PRS resources in other time slots (such as retransmission resources of the first SL PRS), or may not indicate SL PRS resources in other time slots.

[0212] There may be multiple ways for the second-order SCI to indicate the first SL PRS resource. Two possible indication ways are given below in combination with Embodiment 2.1 and Embodiment 2.2.

[0213] Example 2.1: The second-order SCI indicates the ID of the first SL PRS resource

[0214] In some embodiments, the terminal device that sends the first SL PRS and the terminal device that receives the first SL PRS can exchange SL PRS resource configuration information through sidelink positioning protocol (SLPP) layer signaling, or determine the SL PRS resource configuration information based on the configuration / pre-configuration information of the resource pool. The SL PRS resource configuration information can be used to configure the first SL PRS resource. The SL PRS resource configuration information may include, for example, one or more of the following: SL PRS resource ID, the comb size and RE offset of the SL PRS sent in the SL PRS resource, and the starting OFDM symbol of the SL PRS resource in the time slot and the number of continuous OFDM symbols occupied. After the above configuration, each ID can correspond to (or uniquely correspond to) one SL PRS resource.

[0215] In embodiment 2.1, the second-order SCI may indicate the ID of the scheduled first SL PRS resource, thereby reducing the overhead of indication signaling in the second-order SCI.

[0216] In some embodiments, the bit field for indicating the ID of the first SL PRS resource in the second-order SCI may include or bits, where Indicates rounding up, R indicates the maximum value of SL PRS resources configured in SL PRS resource configuration information. bit, an additional value is used to indicate that no SL PRS is sent. If the terminal device that sends the first SL PRS and the terminal device that receives the first SL PRS exchange SL PRS resource configuration information through SLPP layer signaling, the value of R can be defined by the standard. For example, the standard can define the value of R as 15 or other values. If the SL PRS resource configuration information is determined according to the resource pool configuration / pre-configuration information, the value of R can be determined according to the resource pool configuration / pre-configuration information.

[0217] Embodiment 2.2: The second-order SCI indicates one or more of the OFDM symbols occupied by the first SL PRS resource, the comb tooth size corresponding to the first SL PRS, and the RE offset corresponding to the first SL PRS.

[0218] There are multiple ways to indicate the OFDM symbols occupied by the first SL PRS resource. Two possible indication methods are given below.

[0219] Method 1:

[0220] The second-order SCI may include a fifth bit field. The fifth bit field may be used to indicate the number N of OFDM symbols occupied by the first SL PRS resource. The number of bits in the fifth bit field may be 4, 10, or M may represent the number of consecutive OFDM symbols available for sideline transmission (such as the average number of OFDM symbols or the maximum number of OFDM symbols) in a time slot excluding PSSCH DMRS, PSCCH, and PSFCH, where M≥N.

[0221] In some embodiments, the N symbols occupied by the first SL PRS resource may be: the last N consecutive OFDM symbols available for sidelink transmission in a time slot excluding PSSCH DMRS, PSCCH and PSFCH.

[0222] Method 2:

[0223] The second-order SCI includes a sixth bit field. The sixth bit field can be used to indicate the starting point and number of OFDM symbols occupied by the first SL PRS resource. The information carried in the sixth bit field can be called a resource indication value (RIV).

[0224] In some embodiments, the number of bits in the sixth bit field is based on Determine, where M represents the number of consecutive OFDM symbols (such as the average number of OFDM symbols or the maximum number of OFDM symbols) that can be used for sideline transmission in a time slot excluding PSSCH DMRS, PSCCH and PSFCH, or M=10. As an example, the number of bits in the sixth bit field is equal to

[0225] Taking the sixth bit field carrying RIV as an example, the RIV can be expressed as: n start It represents the interval between the first OFDM symbol occupied by the first SL PRS resource and the first OFDM symbol in M ​​OFDM symbols, and N represents the number of OFDM symbols occupied by the scheduled SL PRS resources.

[0226] Compared with embodiment 2.1, embodiment 2.2 may reduce the overhead of indication signaling in SLPP layer signaling.

[0227] The resource ID mentioned in any of the above embodiments may refer to or be replaced by the ID associated with the resource. For example, the ID of the SL PRS resource may refer to the ID associated with the SL PRS resource. For another example, the ID of the PSCCH resource may refer to the ID associated with the PSCCH resource.

[0228] In some of the above embodiments, it is mentioned that the SCI indicates the retransmission resources of the SL PRS, and the retransmission resources may refer to the retransmission resources within the same cycle. In other words, the SCI may only indicate the retransmission resources within the same cycle.

[0229] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 12. The device embodiment of the present application is described in detail below in conjunction with Figures 13 and 14. 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.

[0230] Figure 13 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application. Terminal device 1300 in Figure 13 includes a communication module 1310. Communication module 1310 can be used to send or receive a first sidelink positioning reference signal within a first resource pool; wherein the first resource pool is one of the following: a dedicated resource pool for sidelink positioning reference signals; or a shared resource pool for sidelink positioning reference signals and sidelink data channels.

[0231] In some embodiments, the first resource pool is the dedicated resource pool.

[0232] In some embodiments, there is a one-to-one mapping relationship between the physical sidelink control channel PSCCH resources and the sidelink positioning reference signal resources in the first resource pool.

[0233] In some embodiments, the PSCCH resources and the sidelink positioning reference signal resources in one time slot are associated with the same identifier.

[0234] In some embodiments, one PSCCH resource in the first resource pool is associated with one or more sidelink positioning reference signal resources.

[0235] In some embodiments, each PSCCH resource in the first resource pool is associated with one or more sidelink positioning reference signal resources in an orthogonal frequency division multiplexing (OFDM) symbol group.

[0236] In some embodiments, the value ranges corresponding to the identifiers of the PSCCH resources and the sidelink positioning reference signal resources in a time slot are different.

[0237] In some embodiments, each PSCCH resource within a time slot is associated with one OFDM symbol group within the time slot.

[0238] In some embodiments, the number of PSCCH resources within one time slot is greater than or equal to the number of OFDM symbol groups within the one time slot.

[0239] In some embodiments, the first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource within a first time slot. The first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource. The first PSCCH resource carries sidelink control information SCI. The SCI includes a first bit field. The first bit field is used to indicate the first sidelink positioning reference signal resource. The number of bits in the first bit field is associated with a first quantity. The first quantity is determined based on the number of sidelink positioning reference signal resources associated with the first PSCCH resource.

[0240] In some embodiments, the number of bits in the first bit field is based on OK, among them represents rounding up, and D represents the first quantity.

[0241] In some embodiments, the terminal device further includes: a first selection module configured to first select a target side positioning reference signal resource and then select a PSCCH resource associated with the target side positioning reference signal resource during a resource selection process.

[0242] In some embodiments, the first resource pool includes a second sidelink positioning reference signal resource, and the second sidelink positioning reference signal resource is associated with one or more PSCCH resources.

[0243] In some embodiments, the terminal device also includes: a second selection module, which is used to first select the second sideline positioning reference signal resource during the resource selection process, and then select the target PSCCH resource from one or more PSCCH resources associated with the second sideline positioning reference signal resource.

[0244] In some embodiments, the target PSCCH resource is randomly selected from one or more PSCCH resources associated with the second sidelink positioning reference signal resource.

[0245] In some embodiments, the first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource within a first time slot, the first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource, the first PSCCH resource carries an SCI, the SCI is used to schedule the first sidelink positioning reference signal resource, the SCI includes a second bit field, the second bit field is used to indicate a third sidelink positioning reference signal resource, the time slot where the third sidelink positioning reference signal resource is located is the second time slot, and the third sidelink positioning reference signal resource is a retransmission resource of the first sidelink positioning reference signal.

[0246] In some embodiments, the third sidelink positioning reference signal resource is associated with the same identifier as the first sidelink positioning reference signal resource.

[0247] In some embodiments, the second bit field is only used to indicate the time slot where the retransmission resource of the first sidelink positioning reference signal is located.

[0248] In some embodiments, the first sidelink positioning reference signal resource and the third sidelink positioning reference signal resource both correspond to a first OFDM symbol group in a time slot.

[0249] In some embodiments, the first sidelink positioning reference signal resource and the third sidelink positioning reference signal resource correspond to different resources in the first OFDM symbol group.

[0250] In some embodiments, the second bit field is used to indicate one or more of the following: the second time slot; and a first offset value, wherein the first offset value is used to determine an identifier of the third sidelink positioning reference signal resource.

[0251] In some embodiments, the first offset value is an offset value of the identifier of the third sidelink positioning reference signal resource relative to a target identifier, and the target identifier is the minimum identifier of the sidelink positioning reference signal resource in the first OFDM symbol group.

[0252] In some embodiments, the second bit field includes a third bit field, and the third bit field is used to carry the first offset value. The number of bits in the third bit field is associated with the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool.

[0253] In some embodiments, the number of bits in the third bit field is based on OK, among them represents rounding up, A represents the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool, and R represents the number of retransmission resources indicated by the SCI.

[0254] In some embodiments, the third sidelink positioning reference signal resource is any sidelink positioning reference signal resource in a time slot.

[0255] In some embodiments, the second bit field is used to indicate one or more of the following: the second time slot; and an identifier of the third sidelink positioning reference signal resource.

[0256] In some embodiments, the second bit field includes a fourth bit field, and the fourth bit field is used to carry the identifier of the fourth sidelink positioning reference signal resource, and the number of bits of the fourth bit field is associated with the number of sidelink positioning reference signal resources in a time slot in the first resource pool.

[0257] In some embodiments, the number of bits in the fourth bit field is based on Determine, among which, represents rounding up, R represents the number of retransmission resources indicated by the SCI, and C represents the number of sidelink positioning reference signal resources in a time slot.

[0258] In some embodiments, the identifiers of the sidelink positioning reference signal resources within one OFDM symbol group are continuous.

[0259] In some embodiments, the identifiers of the sidelink positioning reference signal resources within a time slot are continuous.

[0260] In some embodiments, the first resource pool is the shared resource pool.

[0261] In some embodiments, the first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource, and the first sidelink positioning reference signal resource is scheduled based on a second-order SCI.

[0262] In some embodiments, the second-order SCI indicates an identifier of the first sidelink positioning reference signal resource.

[0263] In some embodiments, the second-order SCI indicates one or more of the following: the OFDM symbol occupied by the first sidelink positioning reference signal resource; the comb tooth size corresponding to the first sidelink positioning reference signal; and the resource element RE offset corresponding to the first sidelink positioning reference signal.

[0264] In some embodiments, the second-order SCI includes a fifth bit field, the fifth bit field is used to indicate the number of OFDM symbols occupied by the first sidelink positioning reference signal resource, and the number of bits in the fifth bit field is 4, 10 or M represents the maximum number of consecutive OFDM symbols available for sideline transmission in a time slot, excluding the physical sideline shared channel demodulation reference signal PSSCH DMRS, PSCCH and the physical sideline feedback channel PSFCH.

[0265] In some embodiments, the second-order SCI includes a sixth bit field, and the sixth bit field is used to indicate the starting point and number of OFDM symbols occupied by the first sidelink positioning reference signal resource.

[0266] In some embodiments, the number of bits in the sixth bit field is based on Determine, where M represents the maximum number of consecutive OFDM symbols available for sideline transmission in a time slot excluding PSSCH DMRS, PSCCH and PSFCH, or M=10.

[0267] In some embodiments, the first sidelink positioning reference signal is located in a first time slot, and the second-order SCI indicates or does not indicate sidelink positioning reference signal resources in other time slots.

[0268] FIG14 is a schematic block diagram of an apparatus according to an embodiment of the present application. The dashed lines in FIG14 indicate that the unit or module is optional. Apparatus 1400 may be used to implement the method described in the above method embodiment. Apparatus 1400 may be a chip, a terminal device, or a network device.

[0269] The device 1400 may include one or more processors 1410. The processor 1410 may support the device 1400 to implement the method described in the method embodiment above. The processor 1410 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.

[0270] The apparatus 1400 may further include one or more memories 1420. The memories 1420 store programs that can be executed by the processor 1410, causing the processor 1410 to perform the methods described in the above method embodiments. The memories 1420 may be independent of the processor 1410 or integrated into the processor 1410.

[0271] The apparatus 1400 may further include a transceiver 1430. The processor 1410 may communicate with other devices or chips via the transceiver 1430. For example, the processor 1410 may transmit and receive data with other devices or chips via the transceiver 1430.

[0272] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal device provided in the present invention, and the program enables a computer to execute the method performed by the terminal device in each embodiment of the present invention.

[0273] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device provided in the present application, and the program causes a computer to execute the method performed by the terminal device in each embodiment of the present application.

[0274] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal device provided in the embodiments of the present application, and the computer program enables a computer to execute the method executed by the terminal device in each embodiment of the present application.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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)).

[0287] 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 side transmission method, characterized in that: include: The terminal device sends or receives a first sideline positioning reference signal in a first resource pool; The first resource pool is one of the following: A dedicated resource pool for side positioning reference signals; and A shared resource pool for sidelink positioning reference signals and sidelink data channels.

2. The method according to claim 1, characterized in that The first resource pool is the dedicated resource pool.

3. The method according to claim 2, characterized in that There is a one-to-one mapping relationship between the physical sidelink control channel PSCCH resources and the sidelink positioning reference signal resources in the first resource pool.

4. The method according to claim 3, characterized in that The PSCCH resources and the sidelink positioning reference signal resources in one time slot are associated with the same identifier.

5. The method according to claim 2, characterized in that: A PSCCH resource in the first resource pool is associated with one or more sidelink positioning reference signal resources.

6. The method according to claim 5, characterized in that Each PSCCH resource in the first resource pool is associated with one or more sideline positioning reference signal resources in an orthogonal frequency division multiplexing OFDM symbol group.

7. The method according to claim 5 or 6, characterized in that: The value ranges corresponding to the identifier of the PSCCH resource and the identifier of the sidelink positioning reference signal resource in a time slot are different.

8. The method according to any one of claims 5 to 7, characterized in that Each PSCCH resource within a time slot is associated with one OFDM symbol group within the time slot.

9. The method according to any one of claims 5 to 8, characterized in that The number of PSCCH resources in one time slot is greater than or equal to the number of OFDM symbol groups in the one time slot.

10. The method according to any one of claims 5 to 9, characterized in that The first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource in a first time slot. The first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource. The first PSCCH resource carries sidelink control information SCI. The SCI includes a first bit field. The first bit field is used to indicate the first sidelink positioning reference signal resource. The number of bits in the first bit field is associated with a first quantity. The first quantity is determined based on the number of sidelink positioning reference signal resources associated with the first PSCCH resource.

11. The method according to claim 10, characterized in that The number of bits in the first bit field is based on Determine, among which represents rounding up, and D represents the first quantity.

12. The method according to any one of claims 5 to 11, characterized in that The method further comprises: In the resource selection process, the terminal device first selects a target side line positioning reference signal resource, and then selects a PSCCH resource associated with the target side line positioning reference signal resource.

13. The method according to claim 2, characterized in that The first resource pool includes a second sideline positioning reference signal resource, and the second sideline positioning reference signal resource is associated with one or more PSCCH resources.

14. The method according to claim 13, characterized in that The method further comprises: During the resource selection process, the terminal device first selects the second sideline positioning reference signal resource, and then selects a target PSCCH resource from one or more PSCCH resources associated with the second sideline positioning reference signal resource.

15. The method according to claim 14, characterized in that The target PSCCH resource is randomly selected from one or more PSCCH resources associated with the second sideline positioning reference signal resource.

16. The method according to any one of claims 2 to 15, characterized in that The first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource in a first time slot, the first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource, the first PSCCH resource carries an SCI, the SCI is used to schedule the first sidelink positioning reference signal resource, the SCI includes a second bit field, the second bit field is used to indicate a third sidelink positioning reference signal resource, the time slot where the third sidelink positioning reference signal resource is located is the second time slot, and the third sidelink positioning reference signal resource is a retransmission resource of the first sidelink positioning reference signal.

17. The method according to claim 16, characterized in that The third sidelink positioning reference signal resource is associated with the same identifier as the first sidelink positioning reference signal resource.

18. The method according to claim 17, characterized in that The second bit field is only used to indicate the time slot where the retransmission resource of the first sidelink positioning reference signal is located.

19. The method according to claim 16, characterized in that The first sideline positioning reference signal resource and the third sideline positioning reference signal resource both correspond to a first OFDM symbol group in a time slot.

20. The method according to claim 19, characterized in that The first sidelink positioning reference signal resource and the third sidelink positioning reference signal resource correspond to different resources in the first OFDM symbol group.

21. The method according to claim 20, characterized in that The second bit field is used to indicate one or more of the following: the second time slot; and A first offset value, wherein the first offset value is used to determine an identifier of the third sideline positioning reference signal resource.

22. The method according to claim 21, characterized in that The first offset value is an offset value of the identifier of the third sidelink positioning reference signal resource relative to the target identifier, and the target identifier is the minimum identifier of the sidelink positioning reference signal resource in the first OFDM symbol group.

23. The method according to claim 21 or 22, characterized in that The second bit field includes a third bit field, and the third bit field is used to carry the first offset value. The number of bits in the third bit field is associated with the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool.

24. The method according to claim 23, characterized in that The number of bits in the third bit field is based on Determine, among which represents rounding up, A represents the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool, and R represents the number of retransmission resources indicated by the SCI.

25. The method according to claim 16, characterized in that The third sidelink positioning reference signal resource is any sidelink positioning reference signal resource in a time slot.

26. The method according to claim 25, characterized in that The second bit field is used to indicate one or more of the following: the second time slot; and The third side is an identifier of a positioning reference signal resource.

27. The method according to claim 26, characterized in that The second bit field includes a fourth bit field, and the fourth bit field is used to carry the identifier of the fourth sidelink positioning reference signal resource. The number of bits in the fourth bit field is associated with the number of sidelink positioning reference signal resources in a time slot in the first resource pool.

28. The method according to claim 27, characterized in that The number of bits of the fourth bit field is based on Determine, among which, represents rounding up, R represents the number of retransmission resources indicated by the SCI, and C represents the number of sidelink positioning reference signal resources in a time slot.

29. The method according to any one of claims 2 to 28, characterized in that The identifiers of the sidelink positioning reference signal resources within one OFDM symbol group are continuous.

30. The method according to any one of claims 2 to 29, characterized in that The identifiers of the sidelink positioning reference signal resources in one time slot are continuous.

31. The method according to claim 1, characterized in that The first resource pool is the shared resource pool.

32. The method according to claim 31, characterized in that The first sidelink positioning reference signal is carried in the first sidelink positioning reference signal resource, and the first sidelink positioning reference signal resource is scheduled based on a second-order SCI.

33. The method according to claim 32, characterized in that The second-order SCI indicates an identifier of the first sidelink positioning reference signal resource.

34. The method according to claim 32, characterized in that The second-order SCI indicates one or more of the following: The OFDM symbol occupied by the first sideline positioning reference signal resource; The comb teeth size corresponding to the first side positioning reference signal; and The first sideline positioning reference signal corresponds to a resource element RE offset.

35. The method according to claim 32 or 34, characterized in that The second-order SCI includes a fifth bit field, the fifth bit field is used to indicate the number of OFDM symbols occupied by the first sideline positioning reference signal resource, and the number of bits in the fifth bit field is 4, 10 or M represents the maximum number of continuous OFDM symbols available for sideline transmission in a time slot, excluding the physical sideline shared channel demodulation reference signal PSSCH DMRS, PSCCH and the physical sideline feedback channel PSFCH.

36. The method according to claim 32 or 34, characterized in that The second-order SCI includes a sixth bit field, and the sixth bit field is used to indicate the starting point and number of OFDM symbols occupied by the first sidelink positioning reference signal resource.

37. The method according to claim 36, characterized in that The number of bits in the sixth bit field is based on Determine, where M represents the maximum number of consecutive OFDM symbols available for sideline transmission excluding PSSCH DMRS, PSCCH and PSFCH in a time slot, or M=10.

38. The method according to any one of claims 32 to 37, characterized in that The first sidelink positioning reference signal is located in a first time slot, and the second-order SCI indicates or does not indicate sidelink positioning reference signal resources in other time slots.

39. A terminal device, characterized in that: include: A communication module, configured to send or receive a first sideline positioning reference signal in a first resource pool; The first resource pool is one of the following: A dedicated resource pool for side positioning reference signals; and A shared resource pool for sidelink positioning reference signals and sidelink data channels.

40. The terminal device according to claim 39, characterized in that: The first resource pool is the dedicated resource pool.

41. The terminal device according to claim 40, characterized in that: There is a one-to-one mapping relationship between the physical sidelink control channel PSCCH resources and the sidelink positioning reference signal resources in the first resource pool.

42. The terminal device according to claim 41, characterized in that: The PSCCH resources and the sidelink positioning reference signal resources in one time slot are associated with the same identifier.

43. The terminal device according to claim 40, characterized in that: A PSCCH resource in the first resource pool is associated with one or more sidelink positioning reference signal resources.

44. The terminal device according to claim 43, characterized in that: Each PSCCH resource in the first resource pool is associated with one or more sideline positioning reference signal resources in an orthogonal frequency division multiplexing OFDM symbol group.

45. The terminal device according to claim 43 or 44, characterized in that: The value ranges corresponding to the identifier of the PSCCH resource and the identifier of the sidelink positioning reference signal resource in a time slot are different.

46. ​​The terminal device according to any one of claims 43 to 45, characterized in that: Each PSCCH resource within a time slot is associated with one OFDM symbol group within the time slot.

47. The terminal device according to any one of claims 43 to 46, characterized in that: The number of PSCCH resources in one time slot is greater than or equal to the number of OFDM symbol groups in the one time slot.

48. The terminal device according to any one of claims 43 to 47, characterized in that: The first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource in a first time slot. The first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource. The first PSCCH resource carries sidelink control information SCI. The SCI includes a first bit field. The first bit field is used to indicate the first sidelink positioning reference signal resource. The number of bits in the first bit field is associated with a first quantity. The first quantity is determined based on the number of sidelink positioning reference signal resources associated with the first PSCCH resource.

49. The terminal device according to claim 48, characterized in that: The number of bits in the first bit field is based on Determine, among which represents rounding up, and D represents the first quantity.

50. The terminal device according to any one of claims 43 to 49, characterized in that: The terminal device further includes: The first selection module is used to first select a target side positioning reference signal resource and then select a PSCCH resource associated with the target side positioning reference signal resource during a resource selection process.

51. The terminal device according to claim 40, characterized in that: The first resource pool includes a second sideline positioning reference signal resource, and the second sideline positioning reference signal resource is associated with one or more PSCCH resources.

52. The terminal device according to claim 51, characterized in that: The terminal device further includes: The second selection module is used to first select the second sideline positioning reference signal resource during the resource selection process, and then select a target PSCCH resource from one or more PSCCH resources associated with the second sideline positioning reference signal resource.

53. The terminal device according to claim 52, characterized in that: The target PSCCH resource is randomly selected from one or more PSCCH resources associated with the second sideline positioning reference signal resource.

54. The terminal device according to any one of claims 40 to 53, characterized in that: The first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource in a first time slot, the first time slot also includes a first PSCCH resource associated with the first sidelink positioning reference signal resource, the first PSCCH resource carries an SCI, the SCI is used to schedule the first sidelink positioning reference signal resource, the SCI includes a second bit field, the second bit field is used to indicate a third sidelink positioning reference signal resource, the time slot where the third sidelink positioning reference signal resource is located is the second time slot, and the third sidelink positioning reference signal resource is a retransmission resource of the first sidelink positioning reference signal.

55. The terminal device according to claim 54, characterized in that: The third sidelink positioning reference signal resource is associated with the same identifier as the first sidelink positioning reference signal resource.

56. The terminal device according to claim 55, characterized in that: The second bit field is only used to indicate the time slot where the retransmission resource of the first sidelink positioning reference signal is located.

57. The terminal device according to claim 54, characterized in that: The first sideline positioning reference signal resource and the third sideline positioning reference signal resource both correspond to a first OFDM symbol group in a time slot.

58. The terminal device according to claim 57, characterized in that: The first sidelink positioning reference signal resource and the third sidelink positioning reference signal resource correspond to different resources in the first OFDM symbol group.

59. The terminal device according to claim 58, characterized in that: The second bit field is used to indicate one or more of the following: the second time slot; and A first offset value, wherein the first offset value is used to determine an identifier of the third sideline positioning reference signal resource.

60. The terminal device according to claim 59, characterized in that: The first offset value is an offset value of the identifier of the third sidelink positioning reference signal resource relative to the target identifier, and the target identifier is the minimum identifier of the sidelink positioning reference signal resource in the first OFDM symbol group.

61. The terminal device according to claim 59 or 60, characterized in that: The second bit field includes a third bit field, and the third bit field is used to carry the first offset value. The number of bits in the third bit field is associated with the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool.

62. The terminal device according to claim 61, characterized in that: The number of bits in the third bit field is based on Determine, among which represents rounding up, A represents the maximum number of sidelink positioning reference signal resources contained in an OFDM symbol group in a time slot in the first resource pool, and R represents the number of retransmission resources indicated by the SCI.

63. The terminal device according to claim 62, characterized in that: The third sidelink positioning reference signal resource is any sidelink positioning reference signal resource in a time slot.

64. The terminal device according to claim 63, characterized in that: The second bit field is used to indicate one or more of the following: the second time slot; and The third side is an identifier of a positioning reference signal resource.

65. The terminal device according to claim 64, characterized in that: The second bit field includes a fourth bit field, and the fourth bit field is used to carry the identifier of the fourth sidelink positioning reference signal resource. The number of bits in the fourth bit field is associated with the number of sidelink positioning reference signal resources in a time slot in the first resource pool.

66. The terminal device according to claim 65, characterized in that: The number of bits of the fourth bit field is based on Determine, among which, represents rounding up, R represents the number of retransmission resources indicated by the SCI, and C represents the number of sidelink positioning reference signal resources in a time slot.

67. The terminal device according to any one of claims 40 to 66, characterized in that: The identifiers of the sidelink positioning reference signal resources within one OFDM symbol group are continuous.

68. The terminal device according to any one of claims 40 to 67, characterized in that: The identifiers of the sidelink positioning reference signal resources in one time slot are continuous.

69. The terminal device according to claim 39, characterized in that: The first resource pool is the shared resource pool.

70. The terminal device according to claim 69, characterized in that: The first sidelink positioning reference signal is carried in a first sidelink positioning reference signal resource, and the first sidelink positioning reference signal resource is scheduled based on a second-order SCI.

71. The terminal device according to claim 70, characterized in that: The second-order SCI indicates an identifier of the first sidelink positioning reference signal resource.

72. The terminal device according to claim 70, characterized in that: The second-order SCI indicates one or more of the following: The OFDM symbol occupied by the first sideline positioning reference signal resource; The comb teeth size corresponding to the first side positioning reference signal; and The first sideline positioning reference signal corresponds to a resource element RE offset.

73. The terminal device according to claim 70 or 72, characterized in that: The second-order SCI includes a fifth bit field, the fifth bit field is used to indicate the number of OFDM symbols occupied by the first sideline positioning reference signal resource, and the number of bits in the fifth bit field is 4, 10 or M represents the maximum number of continuous OFDM symbols available for sideline transmission in a time slot, excluding the physical sideline shared channel demodulation reference signal PSSCH DMRS, PSCCH and the physical sideline feedback channel PSFCH.

74. The terminal device according to claim 70 or 72, characterized in that: The second-order SCI includes a sixth bit field, and the sixth bit field is used to indicate the starting point and number of OFDM symbols occupied by the first sidelink positioning reference signal resource.

75. The terminal device according to claim 74, characterized in that: The number of bits in the sixth bit field is based on Determine, where M represents the maximum number of consecutive OFDM symbols available for sideline transmission excluding PSSCH DMRS, PSCCH and PSFCH in a time slot, or M=10.

76. The terminal device according to any one of claims 70 to 75, characterized in that: The first sidelink positioning reference signal is located in a first time slot, and the second-order SCI indicates or does not indicate sidelink positioning reference signal resources in other time slots.

77. A terminal device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal device executes the method as described in any one of claims 1-38.

78. A device, characterized in that It comprises a processor, which is used to call a program from a memory so that the device executes the method as described in any one of claims 1-38.

79. 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 38.

80. 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 38.

81. 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 38.

82. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 38.

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