Sidelink transmission method and apparatus, terminal, and computer-readable storage medium

Abstract

Embodiments of the present application provide a sidelink transmission method and apparatus, and a terminal. The method comprises: a terminal sends or receives a sidelink positioning reference signal (SL PRS) and a physical channel, the physical channel comprising a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH), the SL PRS and the physical channel sharing a resource pool, and the SL PRS and the physical channel being multiplexed and transmitted in the same slot.

Description

Side transmission method and device, terminal, and computer-readable storage medium Technical Field

[0001] The embodiments of the present application relate to the field of mobile communication technology, and specifically to a side transmission method and device, a terminal, and a computer-readable storage medium. Background Art

[0002] To improve positioning accuracy, the 3rd Generation Partnership Project (3GPP) has completed feasibility and performance studies on positioning technology based on the Sidelink Positioning Reference Signal (SL PRS). The introduction of the SL PRS into the sidelink communication system necessitates consideration of how to transmit the SL PRS. Currently, further refinement is needed to determine how to multiplex the SL PRS with other physical channels in the sidelink communication system.

[0003] Summary of the Invention

[0004] Embodiments of the present application provide a side transmission method and apparatus, a terminal, a chip, a computer-readable storage medium, a computer program product, and a computer program.

[0005] The side transmission method provided in the embodiment of the present application includes:

[0006] The terminal sends or receives SL PRS and physical channels, wherein the physical channels include a physical sidelink control channel (Physical Sidelink Control Channel, PSCCH) and / or a physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH); wherein the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed and transmitted in the same time slot.

[0007] The side transmission method provided in the embodiment of the present application includes:

[0008] A communication unit is used to send or receive SL PRS and physical channels, wherein the physical channels include PSCCH and / or PSSCH; wherein the SL PRS and the physical channels share a resource pool, and the SL PRS and the physical channels are multiplexed and transmitted in the same time slot.

[0009] The terminal provided in the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the above-mentioned side transmission method.

[0010] The chip provided in the embodiment of the present application is used to implement the above-mentioned side transmission method.

[0011] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned side transmission method.

[0012] The computer-readable storage medium provided in an embodiment of the present application is used to store a computer program, which enables a computer to execute the above-mentioned side transmission method.

[0013] The computer program product provided in the embodiment of the present application includes computer program instructions, which enable a computer to execute the above-mentioned side transmission method.

[0014] The computer program provided in the embodiment of the present application, when executed on a computer, enables the computer to execute the above-mentioned side transmission method.

[0015] The technical solution of the embodiment of the present application clarifies that the SL PRS and the physical channel (PSCCH and / or PSSCH) can share a resource pool. On this basis, the SL PRS and the physical channel (PSCCH and / or PSSCH) can be multiplexed and transmitted in the same time slot.

[0016] Effectively ensure resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1-1 is a schematic diagram of sideline communication within the network coverage area provided by an embodiment of the present application;

[0019] Figure 1-2 is a schematic diagram of partial network coverage sideline communication provided by an embodiment of the present application;

[0020] Figures 1-3 are schematic diagrams of network coverage outside line communications provided by embodiments of the present application;

[0021] FIG2 is a schematic diagram of resource selection corresponding to the second mode provided in an embodiment of the present application;

[0022] FIG3 is a schematic diagram of a portion of symbols in a time slot provided by an embodiment of the present application being used for sidelink transmission;

[0023] FIG4 is a schematic diagram of the PSCCH and PSSCH time slot structure provided in an embodiment of the present application;

[0024] FIG5 is a schematic diagram of the time domain positions of 4 DMRS symbols when there are 13 PSSCH symbols provided in an embodiment of the present application;

[0025] FIG6 is a schematic diagram of the frequency domain position of the PSSCH DMRS provided in an embodiment of the present application;

[0026] FIG7 is a schematic diagram of PSCCH and PSSCH resource pools in NR-V2X provided in an embodiment of the present application;

[0027] FIG8 is a schematic diagram of the NR system time slot structure provided in an embodiment of the present application;

[0028] FIG9 is a schematic diagram of comb tooth size and RE offset provided in an embodiment of the present application;

[0029] FIG10 is a schematic diagram of an interleaved resource block provided in an embodiment of the present application;

[0030] FIG11 is a schematic diagram of a frame structure based on interleaved resource blocks provided in an embodiment of the present application;

[0031] FIG12 is a schematic diagram of an RB set provided in an embodiment of the present application;

[0032] FIG13 is a flow chart of a side transmission method according to an embodiment of the present application;

[0033] FIG14 is a second flow chart of the side transmission method provided in an embodiment of the present application;

[0034] FIG15 is a schematic diagram of a multiplexing structure within a time slot provided in an embodiment of the present application;

[0035] FIG16 is a second schematic diagram of a multiplexing structure within a time slot provided in an embodiment of the present application;

[0036] FIG17 is a schematic diagram of the first structure of the side transmission device provided in an embodiment of the present application;

[0037] FIG18 is a second schematic diagram of the structure of the side transmission device provided in an embodiment of the present application;

[0038] FIG19 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0039] FIG20 is a schematic structural diagram of a chip according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] The technical solutions of the embodiments of the present application can be applied to various side communication systems, and the terminals in the side communication systems can be any terminals, including but not limited to terminals connected to network devices or other terminals by wired or wireless connection. For example, the terminal can refer to an access terminal, user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handheld terminal, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a 5G network or a terminal in a future evolution network, etc.

[0042] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies in the side communication system are explained below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0043] Sideline communication in different network coverage environments

[0044] In sideline communication, based on the network coverage of the communicating terminals, it can be divided into sideline communication within network coverage, sideline communication with partial network coverage, and sideline communication outside network coverage, as shown in Figures 1-1, 1-2, and 1-3, respectively.

[0045] As shown in Figure 1-1, in sideline communications within network coverage, all terminals performing sideline communications are within the coverage of the same base station. Therefore, the above terminals can all perform sideline communications based on the same sideline configuration by receiving configuration signaling from the base station.

[0046] As shown in Figure 1-2, in the case of partial network coverage and sidelink communication, some terminals performing sidelink communication are within the coverage of the base station. These terminals can receive configuration signaling from the base station and perform sidelink communication according to the base station's configuration. However, terminals outside the network coverage cannot receive configuration signaling from the base station. In this case, terminals outside the network coverage will determine the sidelink configuration based on pre-configuration information and information carried in the Physical Sidelink Broadcast Channel (PSBCH) sent by terminals within the network coverage, and perform sidelink communication.

[0047] As shown in Figure 1-3, for sideline communication outside the network coverage, all terminals performing sideline communication are located outside the network coverage, and all terminals determine the sideline configuration according to pre-configured information for sideline communication.

[0048] Resource selection method in sideline communication

[0049] Device-to-device (D2D) communication is a sidelink transmission technology based on device-to-device (D2D). Unlike traditional cellular systems, where communication data is received or sent via base stations, D2D communication offers higher spectrum efficiency and lower transmission latency. Sidelink communication utilizes direct device-to-device communication, and 3GPP defines two transmission modes: Mode 1 and Mode 2.

[0050] Mode 1: The base station allocates transmission resources to the terminal, and the terminal sends data on the sidelink based on the allocated resources. The base station can allocate resources for either single transmission or semi-static transmission. As shown in Figure 1-1, when the terminal is within network coverage, the network allocates transmission resources for sidelink transmission.

[0051] Mode 2: The terminal selects a resource from the resource pool for data transmission. As shown in Figure 1-3, if the terminal is outside the cell coverage area, it autonomously selects a transmission resource from the preconfigured resource pool for sidelink transmission. Alternatively, as shown in Figure 1-1, the terminal autonomously selects a transmission resource from the network-configured resource pool for sidelink transmission.

[0052] Resource selection in the second mode is performed as follows:

[0053] Step 1: The terminal takes all available resources in the resource selection window as resource set A, and takes the remaining resources in set A after resource exclusion as candidate resource set.

[0054] If a terminal sends data in certain time slots within the listening window and does not listen, all resources corresponding to these time slots in the resource selection window (also referred to as the selection window) are excluded. The terminal uses the value set of the "resource reservation period" field in the resource pool configuration to determine the corresponding time slots within the selection window.

[0055] If the terminal detects a Physical Sidelink Control Channel (PSCCH) within the resource listening window (also referred to as the listening window), it measures the Reference Signal Received Power (RSRP) of the PSCCH or the RSRP of the Physical Sidelink Shared Channel (PSSCH) scheduled by the PSCCH. If the measured RSRP is greater than the SL-RSRP threshold, and the reserved resources are determined to be within the resource selection window based on the resource reservation information in the Sidelink Control Information (SCI) transmitted in the PSCCH, the corresponding resources are excluded from resource set A. If the remaining resources in resource set A are less than X% of the total resources in resource set A before resource exclusion, the SL-RSRP threshold is raised by 3dB and step 1 is repeated. The possible values ​​of X are {20, 35, 50}, and the terminal determines parameter X from this set of values ​​based on the priority of the data to be transmitted. Meanwhile, the SL-RSRP threshold is related to the priority carried in the PSCCH monitored by the terminal and the priority of the data to be sent by the terminal.

[0056] Step 2: The terminal randomly selects several resources from the candidate resource set as the transmission resources for its initial transmission and retransmission.

[0057] It should be noted that, in the embodiment of the present application, the first mode may also be referred to as the first resource selection mode, and the second mode may also be referred to as the second resource selection mode. The technical solution of the embodiment of the present application does not limit the names of the first mode and the second mode.

[0058] As shown in Figure 2, the terminal triggers resource selection or reselection in time slot n, and the resource selection window starts from n+T1 and ends at n+T2. 0≤T1≤T proc,1 , when the subcarrier spacing is 15, 30, 60, 120kHz, T proc,1 For time slots 3, 5, 9, and 17. If T 2min is less than the remaining delay budget of the service, then T 2min≤T2≤The remaining delay budget of the service; otherwise, T2 is equal to the remaining delay budget of the data packet in time slots (PDB, Packet Delay Budget). T 2min The value set of T is {1, 5, 10, 20} * 2 μ time slots, where μ = 0, 1, 2, 3 corresponds to the cases of subcarrier spacings of 15, 30, 60, 120 kHz. The terminal determines T from this value set according to the priority of the data to be sent by itself 2min . [n + T1, n + T2] is called the resource selection window.

[0059] The terminal performs resource sensing from n - T0 to n - T proc,0 . The value of T0 is 100 or 1100 milliseconds. When the subcarrier spacings are 15, 30, 60, 120 kHz, T proc,0 is 1, 1, 2, 4 time slots. [n - T0 to n - T proc,0 is called the resource sensing window.

[0060] The resource selection process in the second mode is carried out in the following two steps:

[0061] Step 1: The physical layer of the terminal excludes the resources that are not suitable for sidelink transmission from the resource selection window according to the channel sensing result. The physical layer of the terminal reports the resource set A after resource exclusion to the upper layer, that is, the MAC layer of the terminal.

[0062] The terminal takes all the available resources belonging to the resource pool used by the terminal within the resource selection window as the resource set A. Any resource in the set A is denoted as R(x, y), where x and y respectively indicate the frequency domain position and time domain position of the resource, representing the resource composed of consecutive L_subch subchannels starting from subchannel x within time slot y. Denote the initial number of resources in the set A as M total .

[0063] Step 1 - 1: If the terminal sends data in time slot a within the sensing window and does not perform sensing, the terminal will determine whether time slot a + q * Prxlg overlaps with the resource R(x, y + j * Ptxlg). If there is an overlap, the resource R(x, y) will be excluded from the resource set A. Where j = 0, 1, 2, 3... C - 1, and C is determined by the random counter value generated by the terminal. Ptxlg is the number of logical time slots after converting the resource reservation period Ptx of the terminal. Prxlg is the number of logical time slots after converting Prx, where Prx is any allowed resource reservation period within the resource pool. If Prx < Tscal and n - m ≤ Prxlg, then Otherwise, Q = 1; Tscal is equal to the value of T2 converted to milliseconds.

[0064] Step 1-2: If the terminal detects the sidelink control information transmitted in the PSCCH on the v-th frequency-domain resource E(v,m) within time slot m in the listening window, the terminal measures the SL-RSRP of this PSCCH or the SL-RSRP of the PSSCH scheduled by this PSCCH (i.e., the SL-RSRP of the corresponding PSSCH transmitted in the same time slot as this PSCCH). If the measured SL-RSRP is greater than the SL-RSRP threshold, and resource reservation between TBs is activated in the resource pool used by the terminal, the terminal assumes that it has received the sidelink control information with the same content on time slot m+q*Prxlg. Here, q = 1, 2, 3…Q. If Prx<Tscal and n-m≤Prxlg, then Otherwise, Q = 1; Tscal is the value of T2 converted to milliseconds. Prxlg is the number of Prx converted to logical time slots. Here, Prx is the resource reservation period indicated by the "Resource reservation period" field in the sidelink control information transmitted in the PSCCH detected by the terminal. The terminal will determine whether the resources indicated by the "Time resource assignment" and "Frequency resource assignment" fields of the sidelink control information received in time slot m and these Q assumed received sidelink control information overlap with the resource R(x,y+j*Ptxlg). If they overlap, the corresponding resource R(x,y) is excluded from set A. Here, j = 0, 1, 2, 3…C-1, and C is determined by the random counter value generated by the terminal. Ptxlg is the number of Ptx converted to logical time slots, and Ptx is the resource reservation period determined by the terminal for resource selection.

[0065] The above RSRP threshold is determined by the priority P1 carried in the PSCCH detected by the terminal and the priority P2 of the data to be transmitted by the terminal. The configuration of the resource pool used by the terminal includes a list of SL-RSRP thresholds, and this SL-RSRP threshold list includes the SL-RSRP thresholds corresponding to all priority combinations (P1, P2). The configuration of the resource pool can be network-configured or pre-configured. If the remaining resources in resource set A are less than M total *X% after the above resource exclusion, the SL-RSRP threshold is increased by 3 dB, and step 1 is re-executed. The possible values of X are {20, 35, 50}. The configuration of the resource pool used by the terminal includes the correspondence between the priority and the possible values of the above X. The terminal determines the value of X according to the priority of the data to be transmitted and this correspondence.

[0066] Step 2: The MAC layer of the terminal randomly selects a resource from the reported candidate resource set to send data. That is, the terminal randomly selects a resource from the candidate resource set to send data.

[0067] Time slot structure in NR-V2X

[0068] In NR-V2X, the PSSCH and its associated PSCCH are transmitted in the same time slot, with the PSCCH occupying two or three time domain symbols (also referred to as symbols). NR-V2X time domain resource allocation uses time slots as the allocation granularity. The parameters starting symbol position (sl-startSLsymbols) and number of symbols (sl-lengthSLsymbols) configure the starting point and length of the time domain symbols used for sidelink transmission (or sidelink communication, abbreviated as SL) in a time slot. The last symbol in this part of symbols is used as the guard period (GP). PSSCH and PSCCH can only use the remaining time domain symbols. However, if a time slot is configured with the Physical Sidelink Feedback Channel (PSFCH) transmission resource, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the automatic gain control (AGC) symbol and GP symbol before the symbol. AGC symbols refer to the symbols where the AGC is located (or occupied), and GP symbols refer to the symbols where the GP is located.

[0069] As shown in Figure 3, the network configuration sl-StartSymbol = 3, sl-LengthSymbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time domain symbols that can be used for PSSCH transmission are symbols 3 to 9. PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0070] In NR-V2X, in addition to PSCCH and PSSCH, PSFCH may also exist in a sidelink time slot. In a time slot, the first time domain symbol is fixed for AGC. On the AGC symbol, the terminal copies the information sent on the second symbol. At the end of the time slot, there is a symbol reserved for transceiver conversion, which is used for the terminal to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining time domain symbols, PSCCH can occupy two or three time domain symbols starting from the second time domain symbol. In the frequency domain, the number of physical resource blocks (PRBs) occupied by PSCCH is within the sub-band range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a sub-channel of PSSCH, or the frequency domain resources of PSSCH include multiple sub-channels, then PSCCH can be frequency-division multiplexed with PSSCH on the time domain symbol where PSCCH is located.

[0071] PSSCH is used to carry second-order sidelink control information (SCI) and sidelink shared channel (SL-SCH). Two second-order SCI formats are defined in 3GPP R16, namely SCI format 2-A and SCI format 2-B. SCI format 2-B is applicable to multicast communication methods that perform sidelink HARQ feedback based on distance information; SCI format 2-A is applicable to other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication methods that require sidelink HARQ feedback, and multicast communication methods that require feedback of positive acknowledgment (ACK) or negative acknowledgment (NACK). In 3GPP R17, an additional second-order SCI format, namely SCI format 2-C, was introduced to indicate reference resource sets and trigger signaling in specific circumstances. The modulation symbols of the second-order SCI are mapped starting from the first symbol where the PSSCH DMRS is located, using a frequency domain first and then a time domain approach. They are then multiplexed with the resource elements (REs) of the PSSCH DMRS on this symbol through interleaving. Furthermore, the modulation symbols of the second-order SCI cannot be mapped to the REs where the PT-RS is located, as shown in Figure 4. The PSSCH DMRS refers to the modulation and demodulation reference signal (DMRS) corresponding to the PSSCH.

[0072] In the sideline communication system, the terminal's autonomous resource selection or the determination of transmission resources based on the network's sideline resource scheduling may cause different terminals to send PSCCH on the same time-frequency resources. In order to ensure that the receiver can detect at least one PSCCH in the event of a PSCCH resource conflict, LTE-V2X adopts a PSCCH DMRS randomization design scheme. PSCCH DMRS refers to the DMRS corresponding to the PSCCH. Specifically, when sending PSCCH, the terminal can randomly select a value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple terminals use different cyclic shifts for the PSCCH DMRS sent on the same time-frequency resources, the receiving terminal can still detect at least one PSCCH through the orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCC) for random selection by the transmitting terminal. Table 1 shows the OCC mask of PSCCH DMRS. As shown in Table 1, the i-th bit of the OCC mask is applied to the i-th DMRS RE in the RB, thereby achieving the effect of distinguishing different terminals. DMRS RE refers to the RE where the DMRS (here refers to PSCCH DMRS) is located.

[0073] Table 1

[0074] The PSSCH DMRS in NR-V2X draws on the design of the NR Uu interface and adopts multiple time-domain PSSCH DMRS patterns (referred to as time-domain DMRS patterns or DMRS patterns). Within a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool (i.e., the number of symbols occupied by the PSSCH). For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 2. Figure 5 shows a schematic diagram of the time-domain position of four DMRS symbols when the PSSCH has 13 symbols. The number of DMRS symbols is 4, and the DMRS symbol positions are symbols 1, 4, 7, and 10, respectively.

[0075] Table 2

[0076] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting terminal selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed terminals to select a high-density DMRS pattern, thereby ensuring channel estimation accuracy, while low-speed terminals can use a low-density DMRS pattern, thereby improving spectral efficiency.

[0077] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula C of the pseudo-random sequence C(m). init middle, p i is the i-th cyclic redundancy check (CRC) code of the PSCCH that schedules the PSSCH, and L=24 is the number of bits of the PSCCH CRC.

[0078] NR PDSCH and PUSCH support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single symbol DMRS frequency domain type 1 supports 4 DMRS ports, single symbol DMRS frequency domain type 2 can support 6 DMRS ports, and in the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support a maximum of two DMRS ports, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 6.

[0079] Determination of NR-V2X frequency domain resources

[0080] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the frequency domain resource allocation granularity is also subchannel. A subchannel consists of a number of PRBs {10, 12, 15, 20, 50, 75, 100}. The minimum subchannel size is 10 PRBs, which is significantly larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is primarily because the frequency domain resources of the PSCCH in NR-V2X are located within the first subchannel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a single PSSCH subchannel. However, the time domain resources of the PSCCH occupy two or three time domain symbols. If the subchannel size is too small, the available PSCCH resources are limited, increasing the code rate and degrading PSCCH detection performance. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resources must be less than or equal to the PSSCH subchannel size. 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:

[0081] Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs included in a subchannel in the resource pool, and the value range is {10, 12, 15, 20, 50, 75, 100} PRBs;

[0082] Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0083] Subchannel start RB index (sl-StartRB-Subchannel): indicates the start PRB index of the first subchannel in the resource pool;

[0084] PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0085] PSCCH frequency domain resource indication (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0086] When the terminal determines the resource pool for PSSCH transmission or reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels starting from the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs contained in the final 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.

[0087] In NR-V2X, the frequency domain starting position of the first subchannel of the PSCCH and its associated PSSCH is aligned. Therefore, the starting position of each PSSCH subchannel is the frequency domain starting position of a possible PSCCH. Based on the above parameters, the frequency domain range of the PSCCH and PSSCH resource pools can be determined. In an example, the frequency domain range of the PSCCH and PSSCH resource pools in NR-V2X is shown in Figure 7.

[0088] In NR-V2X, the PSCCH is used to carry sidelink control information related to resource sensing, including one or more of the following:

[0089] The priority of the scheduled transmission;

[0090] Frequency domain resource allocation, indicating the number of frequency domain resources of PSSCH in the current time slot scheduled by PSCCH, and the number and starting position of frequency domain resources of up to two retransmission resources reserved;

[0091] Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0092] Reference signal pattern for PSSCH;

[0093] Second level SCI format;

[0094] Second-order SCI rate offset;

[0095] Number of PSSCH DMRS ports;

[0096] Modulation and Coding Scheme (MCS);

[0097] MCS form instructions;

[0098] Number of PSFCH symbols;

[0099] Resource reservation period: reserves resources for transmission by another TB in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0100] Reserved bits: 2 to 4 bits. The specific number of bits is configured or pre-configured by the network.

[0101] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0102] Determination of NR-V2X time domain resources (time slots)

[0103] In NR-V2X, PSCCH / PSSCH transmission is based on the time slot level, meaning that only one PSCCH / PSSCH can be transmitted in a time slot. Transmission of multiple PSCCHs / PSSCHs within a time slot via TDM is not supported. PSCCHs / PSSCHs between different users can be multiplexed within a time slot via FDM. The time domain resources of the PSSCH in NR-V2X are based on the time slot granularity. However, unlike LTE-V2X, where the PSSCH occupies all time domain symbols within a subframe, the PSSCH in NR-V2X can occupy partial symbols within a time slot. This is primarily because in LTE systems, uplink and downlink transmissions are also based on the subframe granularity, and therefore sidelink transmissions are also based on the subframe granularity (special subframes in TDD systems are not used for sidelink transmissions). NR systems, on the other hand, use a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols, enabling more flexible scheduling and reducing latency. A typical NR system subframe is shown in Figure 8. A time slot may include downlink symbols (DL), uplink symbols (UL), and flexible symbols. The downlink symbols are located at the start of the time slot, and the uplink symbols are located at the end of the time slot. Flexible symbols are located between the downlink symbols and the uplink symbols. The number of various symbols in each time slot is configurable.

[0104] The sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact the uplink and downlink data transmission of the NR system and reduce system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, that is, a portion of the uplink symbols in a timeslot are used for sidelink transmission. In addition, considering that sidelink transmission includes AGC symbols and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing AGC symbols and GP symbols will leave even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0105] As mentioned above, NR-V2X configures the starting point and length of the time domain symbol used for sideline transmission in a time slot 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 GP, and 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 symbol and GP symbol before the symbol.

[0106] In the NR-V2X system, the time domain resources of the resource pool are also 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 an SFN cycle is the same as that in LTE-V2X, but with the following two differences:

[0107] 1) 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;

[0108] 2) 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's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0109] Determining the time domain resources of the resource pool specifically includes the following steps:

[0110] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including 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

[0111] in:

[0112] 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 SSB transmission cycle and the number of SSB transmission resources configured in the cycle.

[0113] N nonSLIndicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: 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, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0114] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0115] 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 ) satisfies the following conditions, then the time slot is a reserved time slot,

[0116] in:

[0117] N reserved =(10240×2 μ -N S_SSB -N nonSL )mod L bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0118] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0119] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0120] 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 .

[0121] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order i∈{0,1,…,T′ max -1}, where T′ max Indicates the number of time slots included in the resource pool.

[0122] Downlink-based positioning

[0123] In downlink positioning, up to four downlink positioning reference signal (DL PRS) configurations for each positioning frequency layer can be provided for a terminal. The following PRS configuration parameters are provided in the parameter structure of each positioning frequency layer:

[0124] Subcarrier spacing of PRS;

[0125] The cyclic prefix (CP) length of the PRS;

[0126] PRS frequency domain resource bandwidth: This parameter is the number of PRBs allocated to the PRS signal. The minimum PRS resource bandwidth is 24 PRBs, the granularity is 4 PRBs, and the maximum is 272 PRBs.

[0127] Frequency domain starting frequency position of PRS resource: This parameter defines the index number of the starting PRB of the PRS signal in the frequency domain; the PRB index number is defined relative to PointA of the PRS;

[0128] PRS frequency domain reference point PointA;

[0129] PRS comb tooth size Comb-N.

[0130] The PRS parameters configured in each positioning frequency layer are applied to all PRS resources contained in this positioning frequency layer. In other words, in a positioning frequency layer, all PRSs from multiple different transmission and receiving points (TRPs) will use the same subcarrier spacing and CP length, the same comb size, be sent on the same frequency subband, and occupy exactly the same bandwidth. This design allows the terminal to simultaneously receive and measure PRSs from multiple different TRPs that are sent on the same frequency point.

[0131] The parameters of the TRP layer include an ID parameter used to uniquely identify the positioning TRP, the physical cell ID of the TRP, the NR Cell Global Identifier (NCGI) of the TRP, and the Absolute Radio Frequency Channel Number (ARFCN) of the TRP. Each TRP layer can be configured with up to two DL PRS resource sets. The DL PRS resource set layer parameters configure the following parameters, which will apply to all DL PRS resources contained in this resource set:

[0132] DL PRS resource set identification ID (nr-DL-PRS-ResourceSetID);

[0133] DL PRS transmission period and time slot offset (dl-PRS-Periodicity-and-ResourceSetSlotOffset): This parameter defines the time domain transmission behavior of all DL PRS resources included in this DL PRS resource set; the minimum value of the configurable DL PRS transmission period is 4 milliseconds, and the maximum value is 10240 milliseconds. The configuration of DL PRS supports flexible subcarrier spacing, including 15KHz, 30KHz, 60KHz and 120KHz; under different subcarrier spacing conditions, the range of configurable DL PRS transmission period values ​​is the same; Figure 9 shows a schematic diagram of a comb size of 2 and RE offsets of 0 and 1;

[0134] DL PRS resource repetition factor (dl-PRS-ResourceRepetitionFactor): This parameter defines the number of times a PRS resource is repeatedly transmitted in each PRS period; repeated transmission of the same DL PRS resource can be used by the terminal to aggregate the DL PRS signal energy of multiple transmissions, thereby increasing the coverage distance of the DL PRS and increasing the positioning accuracy; in the FR2 system, repeated transmission of DL PRS resources can be used by the terminal to perform receive beam scanning operations; the terminal can use different receive beams to receive repeated transmissions of the same DL PRS resource to find the best match between the TRP transmit beam and the terminal receive beam; on the other hand, repeated transmission of DL PRS resources will increase the PRS overhead; in the 3GPP NR R16 specification, the repetition factor of DL PRS resources is 1, 2, 4, 6, 8, 16 and 32;

[0135] DL PRS resource retransmission interval (dl-PRS-ResourceTimeGap): This parameter defines the number of time slots between two consecutive retransmissions of the same PRS resource;

[0136] DL PRS muting configuration: This parameter is used to define that the DL PRS signal is not sent on certain allocated time-frequency resources (called muting); Muting means that the DL PRS signal is not sent on all allocated time-frequency resources, but is intentionally not sent on certain designated time-frequency resources; the purpose of doing so is to avoid conflicts with other signals such as SSB on the one hand, and to avoid interference between signals sent by different TRPs on the other hand, for example, intentionally turning off the DL PRS transmission of a certain TRP at certain moments so that the terminal can receive the DL PRS signal from a farther TRP. The PRS muting operation will be explained in detail in the subsequent description, so I will not go into details here;

[0137] Number of time domain symbols occupied by DL PRS resources (dl-PRS-NumSymbols): This parameter defines the number of time domain symbols allocated to a DL PRS resource within a time slot.

[0138] As mentioned above, all parameters configured in a DL PRS resource set are applied to all DL PRS resources contained in the resource set. Therefore, all DL PRS resources in the same DL PRS resource set are sent with the same periodicity, the same number of repetitions, and occupy the same number of time domain symbols.

[0139] Each DL PRS resource is configured with the following parameters:

[0140] A DL PRS resource identification ID (nr-DL-PRS-ResourceID);

[0141] DL PRS sequence ID (dl-PRS-Seq terminalnceID);

[0142] DL PRS starting frequency domain resource unit offset (dl-PRS-CombSizeN-AndReOffset): This parameter defines the frequency domain resource unit offset used for resource mapping on the first allocated time domain symbol of the DL PRS resource in a time slot. Based on this parameter and the relative offset value specified in TS38.211, the terminal can determine the frequency domain resource unit offset used for resource mapping on each time domain symbol.

[0143] DL PRS resource slot offset (dl-PRS-ResourceSlotOffset): This parameter defines the slot offset relative to the DL PRS resource set; this parameter determines the slot position of each DL PRS resource;

[0144] DL PRS time domain symbol offset (dl-PRS-ResourceSymbolOffset): This parameter defines the time-frequency resource allocation position of a DL PRS resource within a time slot. It indicates the starting time domain symbol index number within a time slot;

[0145] DL PRS QCL information (dl-PRS-QCL-Info): This parameter provides the Quasi Co-Location (QCL) information of the DL PRS signal.

[0146] Sidelink transmission in unlicensed spectrum (SL-U)

[0147] When performing sidelink transmission over unlicensed spectrum (SL-U), sidelink transmission must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, the occupied channel bandwidth of a terminal using the channel for data transmission must be no less than 80% of the channel bandwidth; for maximum power spectral density requirements, the terminal's transmit power per 1MHz cannot exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmission over unlicensed spectrum uses an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, with a total of M IRBs within the frequency band. The mth IRB consists of RBs in the order {m, M+m, 2M+m, 3M+m, ...}.

[0148] As shown in Figure 10, 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 intervals of two adjacent RBs belonging to the same IRB are the same, i.e., they are 5 RBs apart. The numbers in the boxes in the figure represent the IRB indexes.

[0149] 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. In this case, the frame structure of the SL-U system is shown in Figure 11, where the numbers within the boxes represent the IRB index. Figure 11 illustrates a frame structure where only the PSCCH and PSSCH are included in a time slot, excluding the PSFCH. The bandwidth shown in the figure includes 20 RBs, with five IRB resources configured (i.e., M = 5). Each IRB resource consists of four RBs, and the numbers within the boxes represent the IRB index. In Figure 11, the system configures the PSCCH to occupy one IRB resource and two time-domain symbols. 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 11, PSSCH1 occupies IRB#0 and IRB#1, with its corresponding PSCCH1 occupying IRB#0. PSSCH2 occupies IRB#2, with its corresponding PSCCH2 also occupying IRB#2. It should be noted that, for the sake of simplicity, the figure does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0150] In unlicensed spectrum, terminals access the channel through Listen Before Talk (LBT). LBT uses a granularity of 20 MHz in the frequency domain, with each 20 MHz being called an RB Set. A carrier can include multiple RB Sets, with guard intervals between RB Sets, as shown in Figure 12.

[0151] In the unlicensed spectrum, the terminal needs to perform LBT first. Only after passing LBT can it access the channel. However, the time for the terminal to complete LBT is uncertain. If the terminal is restricted to sending only from the starting point of a time slot, the terminal may miss the sending opportunity because it fails to complete LBT before this time. Therefore, in SL-U, it is considered to add a sending starting point within a time slot, that is, multi-starting point transmission. For example, the additional starting point can be the third or fourth time domain symbol in the time slot.

[0152] Sidelink-based positioning

[0153] In related technologies, research was conducted on "NR positioning enhancements" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage." The "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage" study focused on V2X and public safety use cases. Furthermore, related technologies established requirements for "ranging-based services" and positioning accuracy requirements for Industrial Internet of Things (IIoT) use cases in out-of-coverage scenarios. 3GPP is required to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0154] To improve positioning accuracy, especially for terminals outside cellular network coverage, 3GPP has completed feasibility and performance studies on SL PRS-based positioning technology. Next, solutions based on side-by-side positioning (including ranging and direction finding) in NR systems will be standardized, including but not limited to:

[0155] Standardized SL PRS: SL PRS uses a frequency domain structure based on a comb (does not exclude the full RE mapping mode), adopts a sequence format based on a pseudo-random sequence, takes the existing DL-PRS sequence as the design starting point, and supports a SL PRS bandwidth of up to 100 MHz in FR1;

[0156] Standardize SL PRS resource allocation schemes, including Scheme 1 and Scheme 2. Scheme 1 corresponds to network-allocated SL PRS resources, while Scheme 2 corresponds to UE-autonomous SL PRS resource selection. Scheme 2 requires research and standardization of channel-sensing-based resource selection, random resource selection, congestion control, and / or UE-coordinated resource selection.

[0157] Since the SL PRS is introduced into the sideline communication system, it is necessary to consider how the SL PRS is transmitted. At present, how the SL PRS is multiplexed and transmitted with other physical channels in the sideline communication system needs to be further improved. To this end, the following technical solutions of the embodiments of the present application are proposed.

[0158] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" herein simply describes an association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship. The terms "symbol" and "time-domain symbol" are often used interchangeably herein. Optionally, the symbol and time-domain symbol can be OFDM symbols.

[0159] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0160] It should be noted that the technical solutions of the embodiments of the present application can be applied to both licensed and unlicensed spectrum.

[0161] It should be pointed out that the technical solution of the embodiment of the present application can be adapted to the positioning scenario based on SL PRS. Among them, in the positioning scenario based on SL PRS, the resource pool of SL PRS supports: SL PRS and Rel-16 / 17 / 18 side communication shared resource pool and SL PRS dedicated resource pool. Among them, the SL PRS and Rel-16 / 17 / 18 side communication shared resource pool can be understood as: SL PRS and PSCCH / PSSCH shared resource pool. The SL PRS dedicated resource pool can be understood as: a resource pool dedicated to SL PRS.

[0162] FIG13 is a flow chart of a side transmission method according to an embodiment of the present application. As shown in FIG13 , the side transmission method includes the following steps:

[0163] Step 1301: The terminal sends or receives a SL PRS. The SL PRS is generated by a SL PRS sequence. The SL PRS sequence is generated according to the lowest L bits of the CRC of the PSCCH or according to an ID determined by a higher layer of the sending terminal. L is an integer greater than or equal to 0.

[0164] Here, the transmitting terminal refers to a terminal that transmits the SL PRS. Correspondingly, the receiving terminal refers to a terminal that receives the SL PRS.

[0165] In some implementations, when the SL PRS is required for SL RSRP measurement during resource sensing, the SL PRS sequence is generated based on the least significant L bits of the PSCCH CRC; for example, L = 12. This is not limiting, and L may also have other values. In other cases (i.e., when the SL PRS is not required for SL RSRP measurement during resource sensing), the SL PRS sequence is generated based on an ID determined by a higher layer of the transmitting terminal.

[0166] For example, within a dedicated SL PRS resource pool, if the resource pool uses terminal-independent resource selection mode and is configured to use the SL PRS as the reference signal for SL RSRP measurement during resource sensing, the SL PRS is used for SL RSRP measurement during resource sensing. The SL PRS sequence is generated based on the least significant L bits of the PSCCH CRC; for example, L = 12. In other cases, the SL PRS sequence is generated based on the ID determined by the transmitting terminal's higher layers.

[0167] In some implementations, in SL PRS-based positioning, whether in a shared resource pool or an SL PRS-dedicated resource pool, the SL PRS sequence is generated according to the following formula: Where c(i) is a pseudo-random sequence, which is composed of c init Initialization, c init The time slot index where SL PRS is located, the time domain symbol index where SL PRS is located and function, The value range of is {0,1,…,4095}. It can be seen that the SL PRS sequence is In case SL PRS is needed for SL RSRP measurement during resource sensing, Generated based on the lowest L bits of the CRC of the PSCCH; as an example: L = 12. Not limited to this, L can also have other values. In other cases (i.e., when the SL PRS is not required for SL RSRP measurement during resource listening), Generated based on the ID determined by the upper layer of the sending terminal.

[0168] For example, in a dedicated SL PRS resource pool, if the resource pool adopts the terminal autonomous resource selection mode, according to the configuration or pre-configuration information of the resource pool, PSCCH DMRS or SL PRS can be used as the measurement reference signal of SL RSRP during resource listening. When the resource pool is configured to use at least SL PRS as the measurement reference signal of SL RSRP during resource listening, Generated by the lowest 12 bits of the CRC of the PSCCH that schedules the SL PRS transmission, for example, p i The i-th CRC bit of the PSCCH that schedules the SL PRS, L=12; or p iThe ith CRC of the PSCCH that schedules the SL PRS is L=24, which is the number of bits of the PSCCH CRC. In this way, it can be guaranteed that the terminal performing resource listening can measure the SL RSRP through the SL PRS. In other cases, such as in the shared resource pool of SL PRS and Rel-16 / 17 / 18 sideline communication or the SL PRS dedicated resource pool, the PSCCH DMRS is used as the measurement reference signal for the SL RSRP during the resource listening process, or the resource allocation method based on base station scheduling is adopted in the resource pool. Since the SL PRS does not need to be used for resource listening, The higher layer of the sending terminal may indicate this to the physical layer of the terminal, and then indicate this to the receiving terminal through signaling.

[0169] Through the above scheme, the generation method of SL PRS sequence is clarified, and the positioning scenario based on SL PRS is further improved technically.

[0170] FIG14 is a second flow diagram of a side transmission method according to an embodiment of the present application. As shown in FIG14 , the side transmission method includes the following steps:

[0171] Step 1401: The terminal sends or receives SL PRS and physical channels, where the physical channels include PSCCH and / or PSSCH; wherein the SL PRS and the physical channels share a resource pool, and the SL PRS and the physical channels are multiplexed and transmitted in the same time slot.

[0172] Here, since PSCCH and / or PSSCH belong to the category of Rel-16 / 17 / 18 sideline communication, the SL PRS and physical channels (PSCCH and / or PSSCH) share a resource pool, which can be understood as the SL PRS and Rel-16 / 17 / 18 sideline communication sharing a resource pool.

[0173] In an embodiment of the present application, when the SL PRS and the physical channel share a resource pool, the SL PRS and the physical channel can be multiplexed and transmitted in the same time slot.

[0174] Here, the SL PRS and the physical channel can be multiplexed and transmitted in the same time slot, which may include but is not limited to the following situations:

[0175] In some implementations, the SL PRS and the PSCCH are multiplexed and transmitted in the same time slot, and the SL PRS is scheduled by the PSCCH, that is, the PSCCH and the scheduled SL PRS are multiplexed and transmitted in one time slot.

[0176] In some implementations, the SL PRS, PSCCH, and PSSCH are multiplexed and transmitted in the same time slot, and the SL PRS and the PSSCH are scheduled by the PSCCH. That is, the PSCCH and the scheduled SL PRS and PSSCH are multiplexed and transmitted in one time slot.

[0177] It should be noted that the DMRS corresponding to the PSCCH is called the PSCCH DMRS. The PSCCH DMRS exists on all PSCCH symbols and is frequency-division multiplexed with the PSCCH on these symbols. The PSCCH symbol refers to the time-domain symbol where the PSCCH resides. Therefore, it can be understood that the PSCCH DMRS exists on every time-domain symbol where the PSCCH resides. The time-domain symbol where the PSCCH resides is also the time-domain symbol where the PSCCH DMRS resides, and the time-domain symbol where the PSCCH DMRS resides is also the time-domain symbol where the PSCCH resides.

[0178] It should be noted that the DMRS corresponding to the PSSCH is called the PSSCH DMRS. The PSSCH DMRS can exist on some or all PSSCH symbols and is frequency-division multiplexed with the PSSCH on these some or all PSSCH symbols. The PSSCH symbol refers to the time domain symbol where the PSSCH is located. Therefore, it can be understood that the PSSCH DMRS may or may not exist on the time domain symbol where the PSCCH is located. The time domain symbol where the PSSCH DMRS is located must be the time domain symbol where the PSSCH is located, but the time domain symbol where the PSSCH is located is not necessarily the time domain symbol where the PSSCH DMRS is located.

[0179] Therefore, it can be understood that SL PRS and PSCCH multiplexing transmission in the same time slot actually means: SL PRS, PSCCH and PSCCH DMRS multiplexing transmission in the same time slot. SL PRS, PSCCH and PSSCH multiplexing transmission in the same time slot actually means: SL PRS, PSCCH, PSCCH DMRS, PSSCH and PSSCH DMRS multiplexing transmission in the same time slot.

[0180] It should be noted that the PSCCH is used to carry the first-order SCI, and the PSSCH is used to carry the second-order SCI and / or SL-SCH.

[0181] It should be noted that the time-frequency resources occupied by PSCCH and PSSCH can refer to the description of the aforementioned related technologies.

[0182] It should be noted that in the mapping operation described in the embodiments of the present application, the information sent on the first time domain symbol for sideline transmission in a time slot should be copied to the time domain symbol before the first time domain symbol, and the previous time domain symbol can be understood as an AGC symbol. In some embodiments, the sideline transmission includes at least one of the following: PSSCH, PSCCH, PSSCH DMRS, PSCCH DMRS, SL PRS, and PT-RS.

[0183] In some embodiments, the SL PRS includes a first-type SL PRS and / or a second-type SL PRS;

[0184] The first type of SL PRS refers to the SL PRS sent on the first type of time domain symbol, and the first type of time domain symbol refers to the time domain symbol where the PSCCH in the time slot is located;

[0185] The second type of SL PRS refers to the SL PRS sent on the second type of time domain symbols, and the second type of time domain symbols refers to the time domain symbols in the time slot that do not include the PSCCH and / or PSSCH DMRS.

[0186] In some embodiments, the comb teeth size of the first type SL PRS is smaller than the comb teeth size of the second type SL PRS.

[0187] In some embodiments, the comb tooth size of the first type SL PRS is equal to the comb tooth size of the second type SL PRS.

[0188] For example, the comb tooth size of the first type of SL PRS is equal to 1; the comb tooth size of the second type of SL PRS is greater than 1.

[0189] Here, the smaller the comb tooth size, the greater the density of SL PRS distribution in the frequency domain. When the comb tooth size is equal to 1, SL PRS

[0190] Distributed on every RE in the frequency domain. When the comb tooth size is equal to X (X is an integer greater than 1), the SL PRS is distributed on every X RE in the frequency domain.

[0191] Here, the terminal sends the SL PRS in at least one of the following ways:

[0192] Mode 1) The terminal may send two types of SL PRSs, namely, a first type of SL PRS and a second type of SL PRS.

[0193] As an optional implementation, when the PSSCH is used only to carry the second-order SCI, the SL PRS includes a first-type SL PRS and a second-type SL PRS. That is, when the PSSCH is used only to carry the second-order SCI, the terminal can send the first-type SL PRS and the second-type SL PRS.

[0194] Mode 2) The terminal may only send the first type SL PRS.

[0195] As an optional implementation manner, when the SL PRS and the PSCCH are multiplexed and transmitted in the same time slot, that is, when there is no PSSCH in the time slot, the SL PRS only includes the first type of SL PRS.

[0196] Mode 3) The terminal may only send the second type SL PRS.

[0197] As an optional implementation, when the PSSCH is used to carry the second-order SCI and SL-SCH, the SL PRS only includes the second-type SL PRS. That is, when the PSSCH is used to carry the second-order SCI and SL-SCH, the terminal may only send the second-type SL PRS.

[0198] In one example, as shown in Figure 15, the following are multiplexed and transmitted within a time slot: PSCCH, PSCCH DMRS, PSSCH, PSSCH DMRS, first-type SL PRS, and second-type SL PRS. Figure 15 does not illustrate the PSCCH DMRS. In fact, the PSCCH DMRS and PSCCH are frequency-division multiplexed on PSCCH symbols (i.e., symbols 1, 2, and 3). On symbols 1, 6, and 11, the PSCCH DMRS and PSSCH are frequency-division multiplexed. The time-domain symbols where the first-type SL PRS resides (i.e., symbols 2 and 3) are the time-domain symbols where the PSCCH resides. The time-domain symbols where the second-type SL PRS resides (i.e., symbols 4, 5, 7-10) are time-domain symbols that do not contain the PSCCH or PSSCH DMRS.

[0199] In one example, as shown in Figure 16, the following are multiplexed and transmitted within a time slot: PSCCH, PSCCH DMRS, PSSCH, PSSCH DMRS, and the second-type SL PRS. Figure 16 does not illustrate the PSCCH DMRS; in reality, the PSCCH DMRS is frequency-division multiplexed with the PSCCH on PSCCH symbols (i.e., symbols 1, 2, and 3). On symbols 1, 6, and 11, the PSCCH DMRS is frequency-division multiplexed with the PSSCH. The time-domain symbols containing the second-type SL PRS (i.e., symbols 4, 5, 7-10) do not contain the PSCCH or PSSCH DMRS.

[0200] Regarding the manner in which the terminal sends the SL PRS, the terminal may determine the manner in which the terminal sends the SL PRS according to standard limitations (or protocol agreements) or configuration information in the resource pool or pre-configured information in the resource pool.

[0201] In some embodiments, the time domain symbols used for transmitting the second type of SL PRS are determined by at least one of the following methods: network configuration, pre-configuration, and terminal implementation. The terminal implementation refers to: the MAC layer of the terminal determines the time domain symbols used for transmitting the second type of SL PRS and indicates them to the physical layer of the terminal.

[0202] For example, the terminal may determine the time domain symbols used for sending the second type of SL PRS according to the configuration information of the resource pool (the configuration information is configured by the network).

[0203] For example, the terminal may determine the time domain symbols used for sending the second type of SL PRS according to pre-configuration information of the resource pool (the pre-configuration information is defined by the standard or agreed upon by the protocol).

[0204] For example, the physical layer of the terminal determines the time domain symbols used for sending the second type of SL PRS according to the instruction of the MAC layer.

[0205] In some implementations, the time domain symbols used for the second type of SL PRS transmission meet one or more of the following requirements:

[0206] When PSFCH resources are configured in a time slot, the last Y time domain symbols available for sideline communication in the time slot cannot be used to transmit the second type of SL PRS, where Y is an integer greater than zero. For example, Y=4.

[0207] The time domain symbols used for sending the second type of SL PRS are: time domain symbols used for sideline communication in the time slot, except the first time domain symbol and / or the last time domain symbol;

[0208] The time domain symbols used for the second type of SL PRS transmission are: time domain symbols that do not include PSCCH;

[0209] The time domain symbols used for transmitting the second type of SL PRS are: time domain symbols that do not include PSSCH DMRS;

[0210] The time domain symbols used for the second type of SL PRS transmission are: time domain symbols not occupied by the second order SCI;

[0211] The first time domain symbol in the time domain symbols used for transmitting the second type of SL PRS is: time domain symbol N+n1, where time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and in which no PSSCH DMRS exists, and n1 is an integer greater than or equal to zero;

[0212] The time domain symbols used for sending the second type of SL PRS are: time domain symbols whose distance from any time domain symbol where the PSSCH DMRS is located after the time domain symbol N is greater than or equal to n2, time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and where there is no PSSCH DMRS, and n2 is an integer greater than zero.

[0213] The time domain symbols used for sideline communication within the time slot can be determined based on the parameters of the starting symbol position (sl-startSLsymbols) and the number of symbols (sl-lengthSLsymbols). sl-startSLsymbols and sl-lengthSLsymbols can refer to the description of the aforementioned related technologies.

[0214] It should be noted that the requirements met by the time domain symbols for the second type of SL PRS transmission can be arbitrarily combined or implemented separately. The terminal can determine the time domain symbols for the second type of SL PRS transmission according to the above requirements. As some optional real-time methods, the following are several methods for determining the time domain symbols for the second type of SL PRS transmission:

[0215] Mode 1) The time domain symbols used for sending the second type of SL PRS are: among the time domain symbols used for sideline communication in the time slot, except for the first and last time domain symbols, the remaining time domain symbols do not contain PSSCH DMRS and are not occupied by the second-order SCI.

[0216] Mode 2) The time domain symbols used for sending the second type of SL PRS are: among the time domain symbols used for sideline communication in the time slot, except for the first and last time domain symbols, the remaining time domain symbols do not contain the time domain symbols of PSCCH and PSSCH DMRS.

[0217] Method 3) The time domain symbols used for the second type of SL PRS transmission are indicated by configuration information or pre-configuration information, and the configuration information or pre-configuration information directly or indirectly indicates the index of the time domain symbols that can be used for the second type of SL PRS transmission. For different SL PRS priorities, the number of time domain symbols that can be used for the second type of SL PRS transmission may be different.

[0218] Mode 4) The time domain symbol used for transmitting the second type of SL PRS is determined by the MAC layer of the terminal and indicated to the physical layer of the terminal, wherein the time domain symbol for transmitting the second type of SL PRS determined by the MAC layer of the terminal meets the following requirements:

[0219] The first time domain symbol used for sending the second type of SL PRS is: time domain symbol N+n1, where time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and in which there is no PSSCH DMRS, and the last time domain symbol in the time slot that can be used for side communication cannot be used for sending the second type of SL PRS, and n1 is an integer greater than or equal to zero. The value of n1 can be configured or pre-configured by the network or determined by the MAC layer of the terminal.

[0220] Method 5) The time domain symbol used for sending the second type of SL PRS is: the time domain symbol whose distance from any time domain symbol where the PSSCH DMRS is located is greater than or equal to n2 after the time domain symbol N, the time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and where there is no PSSCH DMRS, n2 is an integer greater than zero, and the value of n2 can be determined by network configuration or pre-configuration or by the MAC layer of the terminal.

[0221] For example, in the example shown in FIG16 , symbols 1, 6, and 11 contain PSSCH DMRS. If the value of n2 is equal to 2, symbols 4, 8, and 9 are time-domain symbols used for transmitting the second type of SL PRS.

[0222] According to method 5), the time domain symbols close to the PSSCH DMRS can be used for PSSCH transmission, thereby improving the demodulation success rate of the PSSCH.

[0223] In some implementations, the number of time domain symbols used for second-type SL PRS transmission in a time slot is related to the number of PSSCH DMRS ports.

[0224] For example: when the number of ports of PSSCH DMRS sent by the terminal is 1, the number of time domain symbols available for sending the second type of SL PRS may be less than the number of time domain symbols available for sending the second type of SL PRS when the number of ports of PSSCH DMRS is 2. For example, when the number of ports of PSSCH DMRS sent by the terminal is 1, the number of time domain symbols available for sending the second type of SL PRS may be 0, and when the number of ports of PSSCH DMRS is 2, the number of time domain symbols available for sending the second type of SL PRS may be greater than 0. It should be noted that when the number of ports of PSSCH DMRS is 1, PSSCH DMRS can be used to obtain positioning-related measurement quantities, such as signal arrival time, channel arrival angle, etc., which can reduce the sending of the second type of SL PRS and use more resources to send PSSCH, thereby improving resource utilization efficiency.

[0225] In some implementations, the terminal determines the comb tooth size of the second type SL PRS and the RE offset corresponding to the first time domain symbol in the time domain symbols used for sending the second type SL PRS.

[0226] In some embodiments, the terminal can determine the comb tooth size of the second type SL PRS and the RE offset corresponding to the first time domain symbol in the time domain symbols sent by the second type SL PRS based on standard limitations (or protocol agreements) or configuration information in the resource pool or pre-configuration information in the resource pool.

[0227] In some embodiments, the comb tooth size of the second type SL PRS can be determined by:

[0228] Mode 1) The comb tooth size of the second type SL PRS is determined by the MAC layer of the terminal and is indicated to the physical layer of the terminal.

[0229] Here, the comb tooth size of the second type SL PRS is determined by the MAC layer of the terminal from the allowed comb tooth sizes. For example, the comb tooth sizes allowed by the standard or in the resource pool are 1, 2, 4, and 6. The specific comb tooth size used is selected by the MAC layer of the terminal. For example, the comb tooth size selected by the MAC layer of the terminal is 4.

[0230] Method 2) The comb tooth size of the second type of SL PRS is agreed upon by the protocol as follows: the maximum allowed comb tooth size is less than or equal to the number of time-domain symbols used for the second type of SL PRS transmission in the time slot. For example, if the number of time-domain symbols used for the second type of SL PRS transmission in the time slot is 3, and the comb tooth sizes allowed by the standard or in the resource pool are 1, 2, 4, and 6, then the comb tooth size is 2.

[0231] In some implementations, the RE offset corresponding to the first time domain symbol in the time domain symbols used for transmitting the second type of SL PRS may be determined in the following manner:

[0232] Mode 1) The RE offset corresponding to the first time domain symbol is determined by the MAC layer of the terminal and indicated to the physical layer of the terminal.

[0233] Here, the RE offset corresponding to the first time domain symbol is selected by the MAC layer of the terminal from the first range, and the first range is determined based on the comb size of the second type SL PRS. For example: the first range is Represents the comb tooth size of the second type SL PRS.

[0234] Mode 2) The RE offset corresponding to the first time domain symbol is determined by the physical layer of the terminal.

[0235] Here, the RE offset corresponding to the first time domain symbol is selected by the physical layer of the terminal from the first range, and the first range is determined based on the comb size of the second type SL PRS. For example: the first range is Represents the comb tooth size of the second type SL PRS.

[0236] It should be noted that the above-mentioned methods for determining the comb tooth size and the RE offset can be arbitrarily combined. As some optional real-time methods, several combinations are given below:

[0237] Method 1) Comb tooth size of the second type SL PRS It is determined by the MAC layer of the terminal and indicated to the physical layer of the terminal; the RE offset corresponding to the first time domain symbol is The physical layer of the terminal Select within the range.

[0238] For example: Comb tooth size The MAC layer of the terminal determines the comb size from the comb sizes allowed by the standard or from the comb sizes allowed in the resource pool. The physical layer of the terminal Randomly select within the range.

[0239] Method 2) Comb tooth size of the second type SL PRS RE offset corresponding to the first time domain symbol All are determined by the MAC layer of the terminal and indicated to the physical layer of the terminal.

[0240] Method 3) Comb tooth size of the second type SL PRS The maximum number of time domain symbols for the second type of SL PRS transmission in the time slot that is less than or equal to the comb tooth size allowed by the standard or in the resource pool; and the RE offset corresponding to the first time domain symbol The physical layer of the terminal Select within the range.

[0241] Further, after determining the RE offset corresponding to the first time domain symbol in the time domain symbols sent by the second type SL PRS,

[0242] The RE offset corresponding to other time domain symbols after the first time domain symbol can be determined based on the RE offset. Assuming that the number of time domain symbols used for the second type of SL PRS transmission in a time slot is R, the R time domain symbols are arranged in ascending order according to the time domain symbol index, and the corresponding order indexes after arrangement are 0≤d≤M-1, then the RE offset corresponding to the dth time domain symbol used for the second type of SL PRS transmission is The value of k′ is determined according to d and the following Table 3, which shows the corresponding relationship between k′ and d.

[0243] Table 3

[0244] When multiplexing sidelink communications within the same timeslot, there's a constraint: after AGC adjustments, the receiving terminal assumes the transmit power is the same across all time-domain symbols within the timeslot. For example, within a timeslot, only the PSCCH is transmitted on symbols 1, 2, and 3. Since the PSCCH occupies a portion of the frequency domain resources corresponding to each symbol, if subsequent information occupies the entire frequency domain resources, to ensure consistent transmit power across all symbols, the PSCCH transmit power per RE must be increased. If the terminal detects a higher transmit power per RE for the PSCCH, it assumes the transmit power for the entire symbol occupied by the PSCCH is higher, resulting in inaccurate measurement results during resource sensing. When selecting resources, the terminal will exclude the resource with the higher transmit power, even though the transmit power of the resource should not have been excluded due to measurement errors. The term "terminal" here refers to the backward terminal, meaning terminals released in 3GPP Rel-17 and earlier.

[0245] In order to ensure measurement accuracy during resource sensing, the transmit power within a time slot must meet certain requirements.

[0246] In some implementations, when at least a PSCCH DMRS is used as a measurement reference signal during resource sensing in a resource pool, the transmit power in a timeslot meets at least one of the following requirements:

[0247] The transmit power of all time domain symbols except the one where the GP is located in the time slot is P;

[0248] The transmit power on the RE where the PSCCH DMRS is located in the time slot is P / K;

[0249] The transmit power on the time domain symbol where the PSCCH in the time slot is located is P;

[0250] Wherein, P is the transmit power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

[0251] In some implementations, when at least a PSSCH DMRS is used as a measurement reference signal in a resource sensing process within a resource pool, the transmit power within a timeslot meets at least one of the following requirements:

[0252] The transmit power of all time domain symbols except the one where the GP is located in the time slot is P;

[0253] The transmit power on the RE where the PSSCH DMRS is located in the time slot is P / K;

[0254] The transmit power on the time domain symbol where the PSSCH DMRS is located in the time slot is P;

[0255] Wherein, P is the transmit power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

[0256] It should be noted that the transmit power on the time domain symbol indicates the sum of the transmit powers on all REs corresponding to the time domain symbol. Here, all REs corresponding to the time domain symbol refer to the REs included in the resource range allocated or selected by the terminal on the time domain symbol.

[0257] In a time slot, for all time domain symbols used for sidelink communication, except for the last GP symbol, the terminal's transmit power on other time domain symbols is P (milliwatts), where P is determined by the terminal based on the power control mode and congestion control mode configured in the resource pool and the relevant path loss measured by the terminal.

[0258] When at least the PSCCH DMRS is used as the reference signal for measuring the SL RSRP during resource sensing in the resource pool, the terminal ensures that the transmit power on each RE where the PSCCH DMRS is located is P / K, where K is the total number of REs included in the resource range allocated or selected by the terminal. Furthermore, if other REs on the PSCCH symbol (i.e., REs other than those occupied by the PSCCH DMRS and PSCCH) are not occupied, the terminal should increase the transmit power of the RE where the first-order SCI modulation symbol is located to ensure that the transmit power on the PSCCH symbol is P; alternatively, the terminal may transmit other content, such as the PSSCH and / or the first-class SL PRS, on other REs on the PSCCH symbol (i.e., REs other than those occupied by the PSSCH DMRS), thereby fully occupying other REs to ensure that the transmit power on the PSSCH symbol is P. In this way, resource sensing by backward terminals is compatible.

[0259] Similarly, when at least the PSSCH DMRS is used as the reference signal for measuring the SL RSRP during resource sensing within the resource pool, the terminal ensures that the transmit power on each RE where the PSSCH DMRS is located is P / K, where K is the total number of REs included in the resource range allocated or selected by the terminal. Furthermore, the terminal can transmit the PSSCH on other REs on the PSSCH symbol (i.e., REs other than those occupied by the PSSCH DMRS), thereby fully occupying other REs to ensure that the transmit power on the PSSCH symbol is P. This ensures compatibility with resource sensing by backward terminals.

[0260] It should be noted that the backward terminal described in the embodiments of the present application may refer to a terminal of 3GPP Rel-17 and earlier.

[0261] Continuing from the above, in some embodiments, when at least PSCCH DMRS is used as a measurement reference signal in the resource listening process in the resource pool, the time domain symbol where the PSCCH is located includes PSSCH and / or the first type of SL PRS. The REs occupied by PSSCH and / or the first type of SL PRS are REs other than the second part of REs in the first part of REs. The first part of REs refers to the REs on the time domain symbol where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs refers to the REs on the time domain symbol where the PSCCH is located that are already occupied by PSCCH DMRS and PSCCH. In this way, all REs on the resource range allocated or selected by the terminal on the time domain symbol where the PSCCH is located can be occupied.

[0262] Here, the PSSCH can be used to carry second-order SCI and / or SL-SCH. In some embodiments, when the PSSCH is used only to carry second-order SCI, the time domain symbol where the PSCCH is located includes the PSSCH and the first-type SL PRS. In some embodiments, when the PSSCH is used to carry second-order SCI and SL-SCH, the time domain symbol where the PSCCH is located includes the PSSCH.

[0263] Through the above solution, the terminal does not need to increase the transmit power of PSCCH DMRS and PSCCH, and can ensure that the transmit power on the time domain symbol where PSCCH is located is the same as the transmit power on other time domain symbols, thereby avoiding the impact on backward terminal resource monitoring.

[0264] As an implementation scheme, in order to simplify system design, the terminal sends PSSCH and / or the first type of SL PRS on the time domain symbol where the PSCCH is located, so that all REs within the resource range allocated or selected by the terminal on the time domain symbol where the PSCCH is located are occupied.

[0265] As another implementation scheme, when PSCCH DMRS is used as the measurement reference signal for SL RSRP during resource listening in the resource pool, the terminal sends PSSCH and / or the first type of SL PRS on the time domain symbol where the PSCCH is located, so that all REs within the resource range allocated or selected by the terminal on the time domain symbol where the PSCCH is located are occupied. When PSSCH DMRS is used as the measurement reference signal for SL RSRP during resource listening in the resource pool, on the time domain symbol where the PSCCH is located, the terminal may only occupy part of the REs within the resource range allocated or selected on the time domain symbol.

[0266] In some implementations, when the time domain symbol where the PSCCH is located includes the PSSCH, it can be understood that: on the time domain symbol where the PSCCH is located, the terminal sends the PSSCH, the purpose of which is to fully occupy the REs on the time domain symbol where the PSCCH is located. This can be achieved in the following ways:

[0267] The terminal performs rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs other than the second part of REs in the first part of REs. The first part of REs refers to the REs corresponding to the time domain symbols where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs refers to the REs occupied by the PSCCH DMRS and PSCCH on the time domain symbols where the PSCCH is located.

[0268] Here, for the PSSCH used only to carry the second-order SCI, it is more suitable to occupy REs in a repeated mapping manner.

[0269] Here, for the PSSCH carrying the second-order SCI and SL-SCH, it is more suitable to occupy REs in a rate matching manner. Of course, REs can also be occupied in a repeated mapping manner.

[0270] In one example, when performing rate matching on the PSSCH, the terminal ensures that the PSSCH can occupy all REs within the resource range allocated or selected by the terminal on the mapped time domain symbol. When at least the PSCCH DMRS in the resource pool is used as a measurement reference signal for the SL RSRP during resource sensing, the mapped time domain symbols include at least the time domain symbol where the PSCCH is located.

[0271] In one example, the terminal repeatedly maps the PSSCH until all REs within the resource range allocated or selected by the terminal on the mapped time domain symbol are occupied. When at least the PSCCH DMRS in the resource pool is used as a measurement reference signal for the SL RSRP during resource sensing, the mapped OFDM symbol includes at least the time domain symbol where the PSCCH is located.

[0272] Continuing from the above, in some embodiments, when at least the PSSCH DMRS is used as a measurement reference signal in the resource listening process in the resource pool, the time domain symbol where the PSSCH DMRS is located includes the PSSCH. The REs occupied by the PSSCH are the REs in the third part of REs except for the fourth part of REs. The third part of REs refers to the REs corresponding to the time domain symbol where the PSSCH DMRS is located within the resource range allocated or selected by the terminal. The fourth part of REs refers to the REs occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located. In this way, all REs within the resource range allocated or selected by the terminal on the time domain symbol where the PSSCH DMRS is located can be fully occupied.

[0273] Here, PSSCH can be used to carry second-order SCI and / or SL-SCH.

[0274] With the above solution, the terminal does not need to increase the transmit power of the PSSCH DMRS, and can ensure that the transmit power on the time domain symbol where the PSSCH DMRS is located is the same as the transmit power on other time domain symbols, thereby avoiding the impact on backward terminal resource monitoring.

[0275] As an implementation scheme, to simplify system design, the terminal transmits PSSCH on the time domain symbol where the PSSCH DMRS is located, so that all REs within the resource range allocated or selected by the terminal on the time domain symbol where the PSSCH DMRS is located are fully occupied.

[0276] As another implementation scheme, when the PSSCH DMRS is used as the reference signal for measuring the SL RSRP during resource sensing within the resource pool, the terminal transmits the PSSCH on the time domain symbol where the PSSCH DMRS is located, so that all REs within the resource range allocated or selected by the terminal on the time domain symbol where the PSSCH DMRS is located are fully occupied. However, when the PSCCH DMRS is used as the reference signal for measuring the SL RSRP during resource sensing within the resource pool, the terminal may occupy only some of the REs within the resource range allocated or selected on the time domain symbol where the PSSCH DMRS is located.

[0277] In some implementations, when the time domain symbol where the PSSCH DMRS is located includes the PSSCH, it can be understood that: on the time domain symbol where the PSSCH DMRS is located, the terminal sends the PSSCH, the purpose of which is to fully occupy the REs on the time domain symbol where the PSSCH DMRS is located. This can be achieved in the following ways:

[0278] The terminal performs rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs in the third part of REs except the fourth part of REs. The third part of REs refers to the REs corresponding to the time domain symbols where the PSSCH DMRS is located within the resource range allocated or selected by the terminal, and the fourth part of REs refers to the REs occupied by the PSSCH DMRS on the time domain symbols where the PSSCH DMRS is located.

[0279] Here, for the PSSCH used only for carrying the second-order SCI, it is more suitable to occupy REs in a repeated mapping manner.

[0280] Here, for the PSSCH carrying the second-order SCI and SL-SCH, it is more suitable to occupy REs in a rate matching manner. Of course, REs can also be occupied in a repeated mapping manner.

[0281] In the above solution, the first type of SL PRS is conducive to ensuring that the transmission power on each RE is the same in the time domain symbol where the PSCCH is located, thereby reducing the impact on the backward terminal resource monitoring.

[0282] In some embodiments, if the terminal sends PSSCH and SL PRS in the same time slot (that is, SL PRS and PSSCH are multiplexed and transmitted in the same time slot), the PSSCH includes at least the second-order SCI and, optionally, may include SL-SCH. If the PSSCH includes SL-SCH, the terminal may determine the size of the transport block (TBS) carried in the PSSCH based on the time domain symbols available for PSSCH transmission and the available REs on each time domain symbol.

[0283] In some implementations, the terminal determines the TBS carried in the PSSCH, where the TBS is related to a first parameter, which is related to a second parameter. The first parameter represents the number of reference REs that can be used for the PSSCH in a PRB occupied by the PSSCH, and the second parameter represents the number of reference REs that can be used for the PSSCH in a PRB.

[0284] If the time domain symbols occupied by the PSSCH and the SL PRS are different, the second parameter is related to the third parameter, and the third parameter indicates the number of symbols occupied by the SL PRS and / or the number of symbols used to support PSFCH transmission;

[0285] If the time domain symbols occupied by the PSSCH and the SL PRS are at least partially identical, the second parameter is related to the fourth parameter, and the fourth parameter represents the number of REs occupied by the SL PRS.

[0286] As an example: the first parameter can be expressed as N RE, the second parameter can be expressed as N' RE , the third parameter can be expressed as The fourth parameter can be expressed as

[0287] In some embodiments, the third parameter may be determined by:

[0288] If no PSFCH resources are configured in the resource pool, the third parameter indicates the number of time domain symbols used for the second type of SL PRS in a time slot;

[0289] If PSFCH resources are configured in the resource pool, the value of the third parameter is Mf, where M represents the number of time-domain symbols used for second-type SL PRS transmission in the time slot, and f represents the number of the last F time-domain symbols in the time slot that can be used for sidelink communication among the M time-domain symbols, 0≤f≤F-1, and F is an integer greater than or equal to 1. As an example: F=4.

[0290] In some embodiments, the fourth parameter may be determined by:

[0291] The fourth parameter is Where M' is the fifth parameter, Indicates the number of subcarriers in a PRB, Indicates the comb tooth size of the SL PRS. If no PSFCH resources are configured in the resource pool, M' is M; if PSFCH resources are configured in the resource pool, M' is Mf. M represents the number of time-domain symbols used for second-type SL PRS transmission in the time slot, and f represents the number of the last F time-domain symbols in the time slot that can be used for sidelink communication. 0 ≤ f ≤ F-1, where F is an integer greater than or equal to 1. As an example, F = 4.

[0292] In one example, the TBS carried in the PSSCH is based on N RE (ie the first parameter) is determined, N RE Indicates the number of reference REs available for PSSCH in the PRB occupied by PSSCH; N RE It can be determined by the following formula:

[0293] where n PRB The number of PRBs occupied by PSSCH. is the number of REs occupied by the first-order SCI (including the REs occupied by the DMRS of the PSCCH). N′ is the RE occupied by the second-order SCI assuming γ = 0, where γ is the number of REs added during the second-order SCI rate matching process to ensure that the second-order SCI occupies a complete PRB. RE(ie, the second parameter) indicates the number of reference REs that can be used for PSSCH in a PRB.

[0294] If PSSCH and SL PRS occupy different time domain symbols, then N′ RE Determined by the following formula:

[0295] If PSSCH and SL PRS can occupy different REs in the same time domain symbol, then N′ RE Determined by the following formula:

[0296] in:

[0297] Indicates the number of subcarriers in a PRB;

[0298] Indicates the number of symbols available for sidelink in a time slot configured by the RRC layer minus 2, excluding the last GP symbol and the first symbol used for AGC;

[0299] 0 or 3, which is the reference value for the number of symbols occupied by the PSFCH. The specific value is indicated by the "PSFCH Symbol Number" field in the first-order SCI. The reason for using the reference value instead of the actual number of symbols used for the PSFCH in the current time slot is the same as that in the second-order SCI rate matching, that is, the final TBS is different because the PSFCH resources in different time slots vary.

[0300] The value of is configured by the RRC layer parameters and is used to indicate the reference value of the number of REs occupied by PT-RS and CSI-RS. The optional values ​​are {0, 3, 6, 9};

[0301] The average number of DMRS REs (i.e., REs where DMRS resides) in a time slot is related to the DMRS pattern allowed in the resource pool, as shown in Table 4 below. The average number of DMRS REs is used here instead of the actual number of DMRS REs to ensure that the determined TBS remains the same when the DMRS pattern changes.

[0302] for (ie the third parameter): If there is no PSFCH resource configured in the resource pool, Indicates the number of time domain symbols used for the second type of SL PRS in a time slot. If PSFCH resources are configured in the resource pool, then Where M represents the number of time domain symbols used for the second type of SL PRS transmission in the time slot, 0≤f≤3, represents the number of time domain symbols in the above M OFDM symbols that belong to the last 4 time domain symbols in the time slot that can be used for sideline communication. For example, in Figure 16, M=7, and time domain symbols 10 and 12 are located in the last 4 time domain symbols in the time slot that can be used for sideline communication. Therefore, when PSFCH is not configured in the resource pool, Otherwise, equal to 5.

[0303] for (Also the fourth parameter): Among them, if PSFCH resources are not configured in the resource pool, M′=M; if PSFCH resources are configured in the resource pool, M′=Mf, where M represents the number of time domain symbols used for sending the second type of SL PRS in the time slot, and 0≤f≤3 represents the number of the last 4 time domain symbols in the time slot among the above M time domain symbols that can be used for side communication. Indicates the comb tooth size of the SL PRS.

[0304] Table 4

[0305] In some embodiments, during the retransmission process of the same TB, if the time domain symbols occupied by the PSSCH and the SL PRS are different, the terminal determines that the number of time domain symbols occupied by the SL PRS sent together with the TB remains unchanged; if the time domain symbols occupied by the PSSCH and the SL PRS are at least partially the same, the terminal determines that the number of time domain symbols occupied by the SL PRS sent together with the TB and the comb tooth size remain unchanged.

[0306] Here, during the retransmission process of the same TB, if the PSSCH and SL PRS occupy different time domain symbols, the transmitting terminal should ensure that the number of time domain symbols occupied by the SL PRS sent together with the TB remains unchanged; if the PSSCH and SL PRS can occupy different REs within the same time domain symbol, the transmitting terminal should ensure that the number of time domain symbols occupied by the SL PRS sent together with the TB and the comb tooth size remain unchanged, thereby ensuring that the TBS determined by the receiving terminal is consistent with that of the transmitting terminal.

[0307] The technical solution of the embodiment of the present application clarifies the multiplexing method of SL PRS and physical channel in the same time slot when SL PRS and physical channel share the resource pool, so as to realize effective multiplexing of SL PRS and physical channel in the same time slot and ensure backward compatibility and resource utilization.

[0308] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will no longer describe the various possible combinations separately. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the idea of ​​the present application, they should also be regarded as the contents disclosed in the present application. For another example, under the premise of no conflict, the various embodiments and / or the technical features in each embodiment described in the present application can be arbitrarily combined with the prior art, and the technical solution obtained after the combination should also fall within the scope of protection of the present application.

[0309] It should also be understood that in the various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply a precedence in 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. In addition, in the embodiments of the present application, the terms "downlink," "uplink," and "sidelink" are used to indicate the transmission direction of signals or data, where "downlink" is used to indicate the first direction of transmission of signals or data from a site to a user equipment in a cell, "uplink" is used to indicate the second direction of transmission of signals or data from a user equipment in a cell to a site, and "sidelink" is used to indicate the third direction of transmission of signals or data from user equipment 1 to user equipment 2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. Specifically, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0310] FIG17 is a schematic diagram of the structure of a side transmission device provided in an embodiment of the present application. As shown in FIG17 , the side transmission device is applied to a terminal. As shown in FIG17 , the side transmission device includes:

[0311] The communication unit 1701 is used to send or receive SL PRS. The SL PRS is generated by an SL PRS sequence. The SL PRS sequence is generated according to the lowest L bits of the CRC of the PSCCH or according to the ID determined by the upper layer of the transmitting terminal. L is an integer greater than or equal to 0.

[0312] In some implementations, when the SL PRS is required for SL RSRP measurement during resource sensing, the SL PRS sequence is generated based on the least significant L bits of the PSCCH CRC; for example, L = 12. This is not limiting, and L may also have other values. In other cases (i.e., when the SL PRS is not required for SL RSRP measurement during resource sensing), the SL PRS sequence is generated based on an ID determined by a higher layer of the transmitting terminal.

[0313] Those skilled in the art should understand that the relevant description of the above-mentioned side transmission device in the embodiment of the present application can be understood with reference to the relevant description of the side transmission method in the embodiment of the present application.

[0314] FIG18 is a second schematic diagram of the structure of a side transmission device provided in an embodiment of the present application. As shown in FIG18 , the side transmission device is applied to a terminal. As shown in FIG18 , the side transmission device includes:

[0315] The communication unit 1801 is configured to send or receive SL PRS and physical channels, where the physical channels include PSCCH and / or PSSCH; wherein the SL PRS and the physical channels share a resource pool, and the SL PRS and the physical channels are multiplexed and transmitted in the same time slot.

[0316] In some embodiments, the SL PRS includes a first-type SL PRS and / or a second-type SL PRS;

[0317] The first type of SL PRS refers to the SL PRS sent on the first type of time domain symbol, and the first type of time domain symbol refers to the time domain symbol where the PSCCH in the time slot is located;

[0318] The second type of SL PRS refers to the SL PRS sent on the second type of time domain symbols, and the second type of time domain symbols refer to the time domain symbols in the time slot that do not contain PSCCH and / or PSSCH DMRS;

[0319] PSSCH DMRS is the DMRS corresponding to PSSCH.

[0320] In some embodiments, the comb teeth size of the first type SL PRS is smaller than the comb teeth size of the second type SL PRS.

[0321] In some embodiments, when PSSCH is used only to carry the second-order SCI, the SL PRS includes a first-type SL PRS and a second-type SL PRS; or, when PSSCH is used to carry the second-order SCI and SL-SCH, the SL PRS includes only the second-type SL PRS.

[0322] In some embodiments, when at least PSCCH DMRS is used as a measurement reference signal in the resource listening process in the resource pool, the time domain symbol where the PSCCH is located includes PSSCH and / or the first type of SL PRS; the PSCCH DMRS is the DMRS corresponding to the PSCCH.

[0323] In some embodiments, when PSSCH is only used to carry second-order SCI, the time domain symbol where PSCCH is located includes PSSCH and the first type SL PRS; or, when PSSCH is used to carry second-order SCI and SL-SCH, the time domain symbol where PSCCH is located includes PSSCH.

[0324] In some embodiments, the REs occupied by PSSCH and / or the first type of SL PRS are the REs in the first part of REs except the second part of REs. The first part of REs refers to the REs on the time domain symbol where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs refers to the REs on the time domain symbol where the PSCCH is located that are occupied by PSCCH DMRS and PSCCH.

[0325] In some embodiments, when the time domain symbol where the PSCCH is located includes the PSSCH, the apparatus further includes: a processing unit 1802, configured to perform rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs other than the second part of REs in the first part of REs, the first part of REs referring to REs corresponding to the time domain symbol where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs referring to REs on the time domain symbol where the PSCCH is located that are occupied by the PSCCH DMRS and the PSCCH.

[0326] In some implementations, when at least a PSSCH DMRS is used as a measurement reference signal in a resource sensing process in a resource pool, the time domain symbol where the PSSCH DMRS is located includes the PSSCH.

[0327] In some embodiments, the REs occupied by the PSSCH are the REs in the third part of REs except the fourth part of REs, the third part of REs refer to the REs corresponding to the time domain symbols where the PSSCH DMRS is located within the resource range allocated or selected by the terminal, and the fourth part of REs refer to the REs occupied by the PSSCH DMRS on the time domain symbols where the PSSCH DMRS is located.

[0328] In some embodiments, the device further includes: a processing unit 1802, configured to perform rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs other than the fourth part of REs in the third part of REs, where the third part of REs refers to REs corresponding to the time domain symbols where the PSSCH DMRS is located within the resource range allocated or selected by the terminal, and the fourth part of REs refers to REs on the time domain symbols where the PSSCH DMRS is located that are already occupied by the PSSCH DMRS.

[0329] In some implementations, the time domain symbols used for transmitting the second type of SL PRS are determined by at least one of the following methods: network configuration, pre-configuration, and terminal implementation.

[0330] In some implementations, the implementation of the terminal means that the MAC layer of the terminal determines the time domain symbols used for sending the second type of SL PRS and indicates them to the physical layer of the terminal.

[0331] In some implementations, the time domain symbols used for the second type of SL PRS transmission meet one or more of the following requirements:

[0332] The time domain symbols used for sending the second type of SL PRS are: time domain symbols used for sideline communication in the time slot, except the first time domain symbol and / or the last time domain symbol;

[0333] The time domain symbols used for the second type of SL PRS transmission are: time domain symbols that do not include PSCCH;

[0334] The time domain symbols used for transmitting the second type of SL PRS are: time domain symbols that do not include PSSCH DMRS;

[0335] The time domain symbols used for the second type of SL PRS transmission are: time domain symbols not occupied by the second order SCI;

[0336] The first time domain symbol in the time domain symbols used for transmitting the second type of SL PRS is: time domain symbol N+n1, where time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and in which no PSSCH DMRS exists, and n1 is an integer greater than or equal to zero;

[0337] The time domain symbols used for sending the second type of SL PRS are: time domain symbols whose distance from any time domain symbol where the PSSCH DMRS is located after the time domain symbol N is greater than or equal to n2, time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and where there is no PSSCH DMRS, and n2 is an integer greater than zero.

[0338] In some implementations, the number of time-domain symbols used for second-type SL PRS transmission is related to the number of PSSCH DMRS ports.

[0339] In some implementations, the processing unit 1802 is further configured to determine a comb tooth size of the second type SL PRS and an RE offset corresponding to a first time domain symbol in the time domain symbols sent by the second type SL PRS.

[0340] In some embodiments, the comb tooth size of the second type SL PRS is determined by the MAC layer of the terminal and indicated to the physical layer of the terminal; or, the comb tooth size of the second type SL PRS is agreed by the protocol as: the maximum value of the allowed comb tooth size that is less than or equal to the number of time domain symbols used for the second type SL PRS to be sent in the time slot.

[0341] In some implementations, the comb tooth size of the second type SL PRS is determined by the MAC layer of the terminal from allowed comb tooth sizes.

[0342] In some implementations, the RE offset corresponding to the first time domain symbol is determined by the MAC layer of the terminal and indicated to the physical layer of the terminal; or, the RE offset corresponding to the first time domain symbol is determined by the physical layer of the terminal.

[0343] In some implementations, the RE offset corresponding to the first time domain symbol is selected by the MAC layer or the physical layer of the terminal from a first range, where the first range is determined based on the comb tooth size of the second type SL PRS.

[0344] In some embodiments, the first range is Represents the comb tooth size of the second type SL PRS.

[0345] In some embodiments, when SL PRS and PSSCH are multiplexed and transmitted in the same time slot, the processing unit 1802 is further used to determine the size TBS of the transport block carried in the PSSCH, where TBS is related to a first parameter, which is related to a second parameter. The first parameter indicates the number of reference REs that can be used for PSSCH in a PRB occupied by PSSCH, and the second parameter indicates the number of reference REs that can be used for PSSCH in a PRB. If the time domain symbols occupied by PSSCH and SL PRS are different, the second parameter is related to a third parameter, which indicates the number of symbols occupied by SL PRS and / or the number of symbols used to support PSFCH transmission. If the time domain symbols occupied by PSSCH and SL PRS are at least partially identical, the second parameter is related to a fourth parameter, which indicates the number of REs occupied by SL PRS.

[0346] In some embodiments, if PSFCH resources are not configured in the resource pool, the third parameter represents the number of time domain symbols used for the second type of SL PRS in a time slot; if PSFCH resources are configured in the resource pool, the value of the third parameter is Mf, where M represents the number of time domain symbols used for sending the second type of SL PRS in the time slot, and f represents the number of the last F time domain symbols in the time slot that can be used for side communication among the M time domain symbols, 0≤f≤F-1, and F is an integer greater than or equal to 1.

[0347] In some embodiments, the fourth parameter is Where M' is the fifth parameter, Indicates the number of subcarriers in a PRB, Indicates the comb tooth size of the SL PRS.

[0348] In some embodiments, if PSFCH resources are not configured in the resource pool, the value of M′ is M; if PSFCH resources are configured in the resource pool, the value of M′ is Mf; where M represents the number of time domain symbols used for sending the second type of SL PRS in the time slot, and f represents the number of the last F time domain symbols in the time slot that can be used for side communication among the M time domain symbols, 0≤f≤F-1, and F is an integer greater than or equal to 1.

[0349] In some embodiments, the processing unit 1802 is further used to, during the retransmission process of the same TB, if the time domain symbols occupied by the PSSCH and the SL PRS are different, determine that the number of time domain symbols occupied by the SL PRS sent together with the TB remains unchanged; if the time domain symbols occupied by the PSSCH and the SL PRS are at least partially the same, determine that the number of time domain symbols occupied by the SL PRS sent together with the TB and the comb tooth size remain unchanged.

[0350] In some implementations, when at least a PSCCH DMRS is used as a measurement reference signal during resource sensing in a resource pool, the transmit power in a timeslot meets at least one of the following requirements:

[0351] The transmit power of all time domain symbols except the one where the GP is located in the time slot is P;

[0352] The transmit power on the RE where the PSCCH DMRS is located in the time slot is P / K;

[0353] The transmit power on the time domain symbol where the PSCCH in the time slot is located is P;

[0354] Wherein, P is the transmit power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

[0355] In some implementations, when at least a PSSCH DMRS is used as a measurement reference signal in a resource sensing process within a resource pool, the transmit power within a timeslot meets at least one of the following requirements:

[0356] The transmit power of all time domain symbols except the one where the GP is located in the time slot is P;

[0357] The transmit power on the RE where the PSSCH DMRS is located in the time slot is P / K;

[0358] The transmit power on the time domain symbol where the PSSCH DMRS is located in the time slot is P;

[0359] Wherein, P is the transmit power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

[0360] Those skilled in the art should understand that the relevant description of the above-mentioned side transmission device in the embodiment of the present application can be understood with reference to the relevant description of the side transmission method in the embodiment of the present application.

[0361] Figure 19 is a schematic structural diagram of a communication device 1900 provided in an embodiment of the present application. The communication device 1900 shown in Figure 19 includes a processor 1910, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0362] Optionally, as shown in FIG19 , the communication device 1900 may further include a memory 1920. The processor 1910 may call and execute a computer program from the memory 1920 to implement the method in the embodiment of the present application.

[0363] The memory 1920 may be a separate device independent of the processor 1910 , or may be integrated into the processor 1910 .

[0364] Optionally, as shown in FIG19 , the communication device 1900 may further include a transceiver 1930 , and the processor 1910 may control the transceiver 1930 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices.

[0365] The transceiver 1930 may include a transmitter and a receiver. The transceiver 1930 may further include an antenna, and the number of antennas may be one or more.

[0366] The communication device 1900 may specifically be a terminal in an embodiment of the present application, and the communication device 1200 may implement the corresponding processes implemented by the terminal in each method in the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0367] Figure 20 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 2000 shown in Figure 20 includes a processor 2010, which can call and run a computer program from a memory to implement the method according to the embodiment of the present application.

[0368] Optionally, as shown in FIG20 , the chip 2000 may further include a memory 2020. The processor 2010 may call and execute a computer program from the memory 2020 to implement the method in the embodiment of the present application.

[0369] The memory 2020 may be a separate device independent of the processor 2010 , or may be integrated into the processor 2010 .

[0370] Optionally, the chip 2000 may further include an input interface 2030. The processor 2010 may control the input interface 2030 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0371] Optionally, the chip 2000 may further include an output interface 2040. The processor 2010 may control the output interface 2040 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0372] The chip can be applied to the terminal in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0373] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0374] It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by hardware integrated logic circuits in the processor or software instructions. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0375] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0376] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0377] The present application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to a terminal in the present application, and the computer program causes a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these are not further described here.

[0378] The present application also provides a computer program product including computer program instructions. This computer program product can be applied to a terminal in the present application, and the computer program instructions cause a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these instructions are not further described here.

[0379] The present application also provides a computer program. This computer program can be applied to the terminal in the present application. When the computer program is executed on a computer, it causes the computer to execute the corresponding process implemented by the terminal in each method of the present application. For the sake of brevity, it is not further described here.

[0380] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0381] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0386] 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 the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A side transmission method, the method comprising: The terminal sends or receives a sidelink positioning reference signal SL PRS and a physical channel, wherein the physical channel includes a physical sidelink control channel PSCCH and / or a physical sidelink shared channel PSSCH; wherein the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed and transmitted in the same time slot.

2. The method according to claim 1, wherein: The SL PRS includes a first-category SL PRS and / or a second-category SL PRS; The first type of SL PRS refers to the SL PRS sent on the first type of time domain symbols, and the first type of time domain symbols refers to the time domain symbols where the PSCCH in the time slot is located; The second type of SL PRS refers to the SL PRS sent on the second type of time domain symbols, and the second type of time domain symbols refers to the time domain symbols in the time slot that do not include the PSCCH and / or PSSCH DMRS; The PSSCH DMRS is a modulation and demodulation reference signal DMRS corresponding to the PSSCH.

3. The method according to claim 2, wherein: The comb teeth size of the first type SL PRS is smaller than the comb teeth size of the second type SL PRS.

4. The method according to claim 2 or 3, wherein: When the PSSCH is used only to carry the second-order SCI, the SL PRS includes the first-type SL PRS and the second-type SL PRS; or, When the PSSCH is used to carry the second-order SCI and SL-SCH, the SL PRS only includes the second-type SL PRS.

5. The method according to any one of claims 2 to 4, wherein: In the case where at least the PSCCH DMRS is used as a measurement reference signal in the resource listening process in the resource pool, The time domain symbol where the PSCCH is located includes the PSSCH and / or the first type of SL PRS; The PSCCH DMRS is the DMRS corresponding to the PSCCH.

6. The method according to claim 5, wherein: When the PSSCH is used only to carry the second-order SCI, the time domain symbol where the PSCCH is located includes the PSSCH and the first type of SL PRS; or, When the PSSCH is used to carry the second-order SCI and SL-SCH, the PSSCH is included in the time domain symbol where the PSCCH is located.

7. The method according to claim 5 or 6, wherein: The REs occupied by the PSSCH and / or the first type SL PRS are the REs in the first part of REs except the second part of REs. The first part of REs refer to the REs corresponding to the time domain symbol where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs refer to the REs occupied by PSCCH DMRS and PSCCH on the time domain symbol where the PSCCH is located.

8. The method according to any one of claims 5 to 7, wherein: When the PSSCH is included in the time domain symbol where the PSCCH is located, the method further includes: The terminal performs rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs other than the second part of REs in the first part of REs, where the first part of REs refers to REs corresponding to the time domain symbol where the PSCCH is located within the resource range allocated or selected by the terminal, and the second part of REs refers to REs occupied by PSCCH DMRS and PSCCH on the time domain symbol where the PSCCH is located.

9. The method according to any one of claims 2 to 4, wherein: In the case where at least the PSSCH DMRS is used as a measurement reference signal in a resource listening process in the resource pool, The time domain symbol where the PSSCH DMRS is located includes the PSSCH.

10. The method according to claim 9, wherein: The REs occupied by the PSSCH are the REs in the third part of REs except the fourth part of REs, the third part of REs refer to the REs corresponding to the time domain symbol where the PSSCH DMRS is located within the resource range allocated or selected by the terminal, and the fourth part of REs refer to the REs occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located.

11. The method according to claim 9 or 10, wherein: The method further comprises: The terminal performs rate matching and / or repeated mapping on the PSSCH until the PSSCH occupies REs in the third part of REs except the fourth part of REs, the third part of REs refer to REs on the time domain symbol where the PSSCH DMRS is located within the resource range allocated or selected by the terminal, and the fourth part of REs refer to REs on the time domain symbol where the PSSCH DMRS is located that are occupied by the PSSCH DMRS.

12. The method according to any one of claims 2 to 11, wherein: The time domain symbols used for sending the second type SL PRS are determined by at least one of the following methods: network configuration, pre-configuration, and implementation of the terminal.

13. The method according to claim 12, wherein: The implementation of the terminal means that the MAC layer of the terminal determines the time domain symbol used for sending the second type of SL PRS and indicates it to the physical layer of the terminal.

14. The method according to any one of claims 2 to 13, wherein: The time domain symbols used for the second type of SL PRS transmission meet one or more of the following requirements: The time domain symbols used for sending the second type of SL PRS are: time domain symbols used for sideline communication in the time slot, except the first time domain symbol and / or the last time domain symbol; The time domain symbol used for sending the second type of SL PRS is: a time domain symbol not including a PSCCH; The time domain symbol used for sending the second type of SL PRS is: a time domain symbol not including a PSSCH DMRS; The time domain symbols used for sending the second type of SL PRS are: time domain symbols not occupied by the second-order SCI; The first time domain symbol in the time domain symbols used for sending the second type of SL PRS is: time domain symbol N+n1, where time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and where there is no PSSCH DMRS, and n1 is an integer greater than or equal to zero; The time domain symbol used for sending the second type of SL PRS is: a time domain symbol whose distance from any time domain symbol where the PSSCH DMRS is located after the time domain symbol N is greater than or equal to n2, the time domain symbol N is the first time domain symbol after the last time domain symbol where the PSCCH is located and where there is no PSSCH DMRS, and n2 is an integer greater than zero.

15. The method according to any one of claims 2 to 14, wherein: The number of time domain symbols used for sending the second type SL PRS is related to the number of ports of the PSSCH DMRS.

16. The method according to any one of claims 2 to 15, wherein: The method further comprises: The terminal determines a comb tooth size of the second-type SL PRS and an RE offset corresponding to a first time domain symbol in the time domain symbols used for sending the second-type SL PRS.

17. The method according to claim 16, wherein: The comb tooth size of the second type SL PRS is determined by the media access control MAC layer of the terminal and is indicated to the physical layer of the terminal; or, The comb tooth size of the second type SL PRS is agreed upon by the protocol as follows: the allowed comb tooth size is less than or equal to the maximum value of the number of time domain symbols used for sending the second type SL PRS in the time slot.

18. The method according to claim 17, wherein: The comb tooth size of the second type SL PRS is determined by the MAC layer of the terminal from allowed comb tooth sizes.

19. The method according to any one of claims 16 to 18, wherein: The RE offset corresponding to the first time domain symbol is determined by the MAC layer of the terminal, and is indicated to the physical layer of the terminal; or, The RE offset corresponding to the first time domain symbol is determined by the physical layer of the terminal.

20. The method according to claim 19, wherein: The RE offset corresponding to the first time domain symbol is selected by the MAC layer or the physical layer of the terminal from a first range, and the first range is determined based on the comb tooth size of the second type SL PRS.

21. The method according to claim 20, wherein: The first range is Represents the comb tooth size of the second type of SL PRS.

22. The method according to any one of claims 2 to 21, wherein: When the SL PRS and the PSSCH are multiplexed and transmitted in the same time slot, the method further includes: The terminal determines a size TBS of a transport block carried in the PSSCH, where the TBS is related to a first parameter, which is related to a second parameter, where the first parameter represents the number of reference REs that can be used for the PSSCH in a PRB occupied by the PSSCH, and the second parameter represents the number of reference REs that can be used for the PSSCH in one PRB; If the time domain symbols occupied by the PSSCH and the SL PRS are different, the second parameter is related to a third parameter, and the third parameter indicates the number of symbols occupied by the SL PRS and / or the number of symbols used to support PSFCH transmission; If the time domain symbols occupied by the PSSCH and the SL PRS are at least partially identical, then the second parameter is related to a fourth parameter, and the fourth parameter represents the number of REs occupied by the SL PRS.

23. The method according to claim 22, wherein: If no PSFCH resources are configured in the resource pool, the third parameter represents the number of time domain symbols used for the second type of SL PRS in a time slot; If PSFCH resources are configured in the resource pool, the value of the third parameter is Mf, where M represents the number of time domain symbols used for sending the second type of SL PRS in the time slot, and f represents the number of the last F time domain symbols in the time slot that can be used for side communication among the M time domain symbols, 0≤f≤F-1, and F is an integer greater than or equal to 1.

24. The method according to claim 22, wherein: The fourth parameter is Where M' is the fifth parameter, Indicates the number of subcarriers in a PRB. Indicates the comb tooth size of the SL PRS.

25. The method according to claim 24, wherein: If no PSFCH resource is configured in the resource pool, the value of M′ is M; If PSFCH resources are configured in the resource pool, the value of M′ is Mf; Wherein, M represents the number of time domain symbols used for sending the second type SL PRS in the time slot, f represents the number of the last F time domain symbols in the time slot that can be used for side communication among the M time domain symbols, 0≤f≤F-1, and F is an integer greater than or equal to 1.

26. The method according to any one of claims 22 to 25, wherein: The method further comprises: During the retransmission process of the same TB, if the time domain symbols occupied by the PSSCH and the SL PRS are different, the terminal determines that the number of time domain symbols occupied by the SL PRS sent together with the TB remains unchanged; if the time domain symbols occupied by the PSSCH and the SL PRS are at least partially identical, the terminal determines that the number of time domain symbols occupied by the SL PRS sent together with the TB and the comb tooth size remain unchanged.

27. The method according to any one of claims 1 to 8, 12 to 26, wherein: In the case where at least the PSCCH DMRS is used as a measurement reference signal in a resource listening process in the resource pool, the transmit power in the time slot meets at least one of the following requirements: The transmission power of the time domain symbols other than the time domain symbol where the GP is located in the time slot is P; The transmission power on the RE where the PSCCH DMRS in the time slot is located is P / K; The transmission power of the time domain symbol where the PSCCH in the time slot is located is P; Wherein, P is the transmission power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

28. The method according to any one of claims 1 to 4, 9 to 26, wherein: In the case where at least the PSSCH DMRS is used as a measurement reference signal in a resource listening process in the resource pool, the transmit power in the timeslot meets at least one of the following requirements: The transmission power of the time domain symbols other than the time domain symbol where the GP is located in the time slot is P; The transmission power on the RE where the PSSCH DMRS in the time slot is located is P / K; The transmission power of the time domain symbol where the PSSCH DMRS in the time slot is located is P; Wherein, P is the transmission power on the time domain symbols other than the time domain symbols where the GP is located in the time slot, and K is the total number of REs included in the resource range allocated or selected by the terminal.

29. A side transmission device, comprising: A communication unit is used to send or receive SL PRS and a physical channel, wherein the physical channel includes PSCCH and / or PSSCH; wherein the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed and transmitted in the same time slot.

30. A terminal, comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 28.

31. A chip, comprising: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 28.

32. A computer-readable storage medium for storing a computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 28.

33. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 28.

34. A computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 28.

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