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

Abstract

Embodiments of this application provide a sidelink transmission method and apparatus, and a terminal, the method comprising the terminal transmitting or receiving 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 sharing channel (PSSCH), the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed within the same slot.

Description

[Technical Field]

[0001] The embodiments of this application relate to the field of mobile communications technology, and more specifically to a sidelink transmission method and apparatus, a terminal, and a computer-readable storage medium. [Background technology]

[0002] To improve positioning accuracy, the 3rd Generation Partnership Project (3GPP®) is conducting feasibility studies and performance research on positioning technologies based on Sidelink Positioning Reference Signals (SL PRS) at relevant stages. Since SL PRS has been introduced into sidelink communication systems, it is necessary to consider how to transmit SL PRS. Currently, further improvements are needed regarding how SL PRS is multiplexed with other physical channels in sidelink communication systems. [Overview of the project]

[0003] Embodiments of this application provide a sidelink transmission method and apparatus, a terminal, a chip, a computer-readable storage medium, a computer program product, and a computer program.

[0004] The side link transmission method provided in the embodiments of this application is The terminal transmits or receives a physical channel to or from an SL PRS, the physical channel including a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH), the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed within the same slot.

[0005] The side link transmission method provided in the embodiments of this application is The system includes a communication unit configured to transmit or receive an SL PRS and a physical channel, the physical channel including a PSCCH and / or a PSSCH, and the SL PRS and the physical channel share a resource pool and are multiplexed within the same slot.

[0006] The terminal provided in the embodiment of this application comprises a processor and memory. The memory is used to store computer programs, and the processor calls and executes the computer programs stored in the memory to perform the sidelink transmission method described above.

[0007] The chip provided in the embodiment of this application is used to realize the above-described sidelink transmission method. Specifically, the chip includes a processor, which calls and executes a computer program from memory, causing the device on which the chip is mounted to execute the above-described sidelink transmission method.

[0008] The computer-readable storage medium provided in the embodiment of this application is used to store a computer program, which causes the computer to execute the sidelink transmission method described above.

[0009] The computer program product provided in the embodiment of this application includes computer program instructions, which cause a computer to execute the sidelink transmission method described above.

[0010] The computer program provided in the embodiment of this application causes the computer to execute the above-described sidelink transmission method when it is executed on a computer.

[0011] The technical solution of the embodiments of this application clarifies that the SL PRS and the physical channels (PSCCH and / or PSSCH) can share a resource pool, and on this basis, the SL PRS and the physical channels (PSCCH and / or PSSCH) can perform multiplexed transmission within the same slot, thereby effectively ensuring the utilization rate of resources.

Brief Description of the Drawings

[0012] [Figure 1(1)] It is a schematic diagram of sidelink communication within the network coverage provided by the embodiments of this application. [Figure 1(2)] It is a schematic diagram of sidelink communication in partial network coverage provided by the embodiments of this application. [Figure 1(3)] It is a schematic diagram of sidelink communication outside the network coverage provided by the embodiments of this application. [Figure 2] It is a schematic diagram of resource selection corresponding to the second mode provided by the embodiments of this application. [Figure 3] It is a schematic diagram in which some symbols within one slot are used for sidelink transmission provided by the embodiments of this application. [Figure 4] It is a schematic diagram of the slot structure of PSCCH and PSSCH provided by the embodiments of this application. [Figure 5] It is a schematic diagram of the time domain positions of four DMRS symbols when PSSCH is 13 symbols provided by the embodiments of this application. [Figure 6] It is a schematic diagram of the frequency domain position of PSSCH DMRS provided by the embodiments of this application. [Figure 7] It is a schematic diagram of the resource pool of PSCCH and PSSCH in NR-V2X provided by the embodiments of this application. [Figure 8] It is a schematic diagram of the slot structure of the NR system provided by the embodiments of this application. [Figure 9] It is a schematic diagram of the coaming size and RE offset provided by the embodiments of this application. [Figure 10] This is a schematic diagram of an interlaced resource block provided in an embodiment of this application. [Figure 11] This is a schematic diagram of a frame structure based on an interlaced resource block provided in an embodiment of this application. [Figure 12] This is a schematic diagram of the RB set provided in the embodiment of this application. [Figure 13] This is flowchart 1 of the side link transmission method provided in the embodiment of this application. [Figure 14] This is flowchart 2 of the side link transmission method provided in the embodiment of this application. [Figure 15] This is a schematic diagram 1 of the multilayer structure within a slot provided in the embodiment of this application. [Figure 16] This is a schematic diagram 2 of the multilayer structure within a slot provided in the embodiment of this application. [Figure 17] This is a schematic diagram 1 of the configuration of the side link transmission device provided in the embodiment of this application. [Figure 18] This is a schematic diagram 2 of the configuration of the side link transmission device provided in the embodiment of this application. [Figure 19] This is a schematic diagram of a communication device provided in an embodiment of this application. [Figure 20] This is a schematic diagram of the chip in the embodiment of this application. [Modes for carrying out the invention]

[0013] The drawings described above are for the purpose of providing a better understanding of this application and constitute part of this application. The schematic embodiments and descriptions thereof are interpretive of this application and do not constitute an unreasonable limitation thereto.

[0014] In the following, the technical solutions in the embodiments of this application will be described in conjunction with the drawings of the embodiments of this application. Clearly, the embodiments described are not all embodiments, but only a selection of embodiments of this application. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of this application are all within the scope of protection of this application.

[0015] The technical solutions of the embodiments of this application are applicable to various side-link communication systems. A terminal in a side-link communication system may be any terminal, including, but not limited to, terminals connected by wire or wirelessly to network equipment or other terminals. For example, a terminal may refer to an access terminal, user equipment (UE), user unit, user station, mobile station, mobile platform, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user equipment. An access terminal may be a mobile phone, cordless phone, Session Initiation Protocol (SIP) phone, IoT device, satellite mobile terminal, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), mobile device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, terminal in a 5G network, or terminal in a future evolving network.

[0016] To facilitate understanding of the technical solutions of the embodiments of this application, related technologies in the side-link communication system are described below. The related technologies described below can be optionally combined with the technical solutions of the embodiments of this application as selectable solutions, and all of them fall within the scope of protection of the embodiments of this application.

[0017] Sidelink communication in different network coverage environments Sidelink communication can be divided into three types depending on the network coverage status of the terminal performing the communication: in-network coverage sidelink communication, partial network coverage sidelink communication, and sidelink communication outside of network coverage, as shown in Figures 1-1, 1-2, and 1-3, respectively.

[0018] As shown in Figure 1-1, in sidelink communication within network coverage, all terminals performing sidelink communication are located within the coverage area of ​​the same base station. Therefore, all of these terminals receive the base station's configuration signaling and can perform sidelink communication based on the same sidelink configuration.

[0019] As shown in Figure 1-2, in the case of partial network coverage sidelink communication, some of the terminals performing sidelink communication are located within the base station's coverage area, and these terminals can receive the base station's configuration signaling and perform sidelink communication based on the base station's configuration. On the other hand, terminals located outside the network coverage area cannot receive the base station's configuration signaling. In this situation, terminals outside the network coverage area determine the sidelink configuration based on pre-configuration information and information contained in the Physical Sidelink Broadcast Channel (PSBCH) transmitted from terminals located within the network coverage area, and then perform sidelink communication.

[0020] As shown in Figure 1-3, in sidelink communication outside of network coverage, all terminals performing sidelink communication are located outside the network coverage range, and all terminals determine the sidelink configuration based on pre-configured information and perform sidelink communication.

[0021] Resource selection method in sidelink communication Device-to-device (D2D) communication is a type of sidelink transmission technology based on device-to-device (D2D) communication. Unlike conventional cellular systems where communication data is sent and received via a base station, it offers higher spectral efficiency and lower transmission delay. Sidelink communication employs a direct communication method between terminals, and 3GPP defines two transmission modes: Mode 1 and Mode 2.

[0022] In the first mode, the terminal's transmission resources are allocated by the base station, and the terminal transmits data via sidelink based on the resources allocated by the base station. The base station may allocate a single transmission resource to the terminal, or it may allocate a semi-static transmission resource. As shown in Figure 1-1, the terminal is within network coverage, and the network allocates the transmission resources used for sidelink transmission to the terminal.

[0023] In the second mode, the terminal selects one resource from the resource pool to transmit data. As shown in Figure 1-3, the terminal is located outside the cell's coverage range, and the terminal autonomously selects a transmission resource from a pre-configured resource pool to perform sidelink transmission. Alternatively, as shown in Figure 1-1, the terminal autonomously selects a transmission resource from a resource pool configured by the network to perform sidelink transmission.

[0024] Resource selection in the second mode is performed according to the following steps.

[0025] In Step 1, the terminal designates all available resources in the resource selection window as resource set A, and the terminal designates the remaining resources after removing resources from set A as the candidate resource set.

[0026] If a terminal transmits data in a slot within a sensing window but is not performing sensing, all resources on the corresponding slots in the resource selection window (which may also be abbreviated as the selection window) for those slots are excluded. The terminal uses the set of values ​​in the "resource reservation period" field of the resource pool configuration it is using to determine the corresponding slots in the selection window.

[0027] The terminal senses a Physical Sidelink Control Channel (PSCCH) within a resource sensing window (which may also be abbreviated as the sensing window), measures the Reference Signal Received Power (RSRP) of the PSCCH, or the RSRP of the Physical Sidelink Shared Channel (PSSCH) scheduled by the PSCCH, and if the measured RSRP is greater than the SL-RSRP threshold, and the terminal determines that the reserved resource is within the resource selection window based on the resource reservation information in the Sidelink Control Information (SCI) transmitted over the PSCCH, the terminal removes the corresponding resource from resource set A. If the remaining resources in resource set A are less than X% of all resources in resource set A before resource removal, the SL-RSRP threshold is increased by 3dB, and step 1 is repeated. The possible values ​​for X are {20, 35, 50}, and the terminal determines the parameter X from this set of values ​​based on the priority of the data awaiting transmission. At the same time, the SL-RSRP threshold mentioned above is related to the priority included in the PSCCH obtained by sensing by the terminal and the priority of the terminal's pending transmission data.

[0028] In step 2, the terminal randomly selects several resources from the candidate resource set and uses them as the sending resources for the initial transmission and retransmission.

[0029] It should be noted that in the embodiments of the present application, the first mode is also called the first resource selection mode, and the second mode is also called the second resource selection mode. As a technical solution of the embodiments of the present application, the names of the first mode and the second mode are not limited.

[0030] As shown in FIG. 2, the terminal triggers resource selection or reselection in slot n, and the resource selection window starts from n+T1 and ends at n+T2. 0≦T1≦T proc,1 where, when the subcarrier spacing is 15, 30, 60, 120 kHz, T proc,1 is 3, 5, 9, 17 slots. When T 2min is smaller than the remaining delay budget of the service, T 2min ≦T2≦the remaining delay budget of the service; otherwise, T2 is equal to the remaining delay budget (PDB, Packet Delay Budget) of the data packet in slot units. The value set of T 2min is {1,5,10,20}×2 μ slots, where μ = 0, 1, 2, 3 corresponds to the cases when the subcarrier spacing is 15, 30, 60, 120 kHz, and the terminal determines T 2min from this value set based on the priority of its own pending transmission data. [n+T1,n+T2] is called the resource selection window.

[0031] The terminal performs resource sensing from n-T0 to n-T proc,0 where the value of T0 is 100 or 1100 milliseconds. When the subcarrier spacing is 15, 30, 60, 120 kHz, T proc,0 is 1, 1, 2, 4 slots. [n-T0~n-T proc,0 is called the resource sensing window.

[0032] The resource selection process in the second mode is carried out according to the following two steps.

[0033] In step 1, the physical layer of the terminal excludes resources unsuitable for sidelink transmission from the resource selection window based on the result of channel sensing, and 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, as the candidate resource set.

[0034] The terminal uses all available resources within the resource selection window that belong to the terminal's occupied resource pool as the resource set A, and denotes any resource in the set A as R(x,y), where x and y represent the frequency domain position and time domain position of the resource respectively, and R(x,y) represents a resource composed of L_subch consecutive subchannels starting from subchannel x in slot y. Denote the initial quantity of the resources in the set A as M total as such.

[0035] In step 1-1, when the terminal transmits data in slot a within the sensing window and is not performing sensing, the terminal determines whether slot a+q×Prxlg overlaps with resource R(x,y+j×Ptxlg). If there is an overlap, resource R(x,y) is excluded from the resource 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 after converting the resource reservation period Ptx of the terminal into logical slots. Prxlg is the number after converting Prx into logical slots, where Prx is any permitted resource reservation period within the resource pool. When Prx<Tscal and n - m≦Prxlg, Q = ┌Tscal / Prx┐; otherwise, Q = 1. Tscal is the value after converting T2 into milliseconds.

[0036] In step 1-2, when the terminal senses the sidelink control information transmitted on the PSCCH in the v-th frequency domain resource E(v,m) of slot m within the sensing window, the terminal measures the SL-RSRP of the PSCCH or the SL-RSRP of the PSSCH scheduled by the PSCCH (i.e., the SL-RSRP of the corresponding PSSCH transmitted in the same slot as the PSCCH). If the measured SL-RSRP is greater than the SL-RSRP threshold and the resource reservation between TBs within the resource pool required by the terminal is active, the terminal assumes that it has received the sidelink control information of the same content on slot m+q×Prxlg. Here, q = 1, 2, 3…Q, and if Prx<Tscal and n-m≦Prxlg, then Q = ┌Tscal / Prx┐, otherwise Q = 1. Tscal is the value after converting T2 to milliseconds. Prxlg is the number after converting Prx to logical slots, where Prx is the resource reservation period indicated in the "Resource reservation period" field in the sidelink control information transmitted on the PSCCH sensed by the terminal. The terminal determines whether the resources indicated in the "Time resource assignment" and "Frequency resource assignment" fields of the sidelink control information received in slot m and these Q sidelink control information assumed to be received overlap with the resource R(x,y+j×Ptxlg). If there is an 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 after converting Ptx to logical slots, and Ptx is the resource reservation period determined by the terminal that performs resource selection.

[0037] The RSRP threshold described above is determined by the priority P1 included in the PSCCH sensed by the terminal and the priority P2 of the data the terminal is waiting to transmit. The terminal's required resource pool configuration includes an SL-RSRP threshold list, and this SL-RSRP threshold list includes SL-RSRP thresholds corresponding to all priority combinations (P1, P2). The resource pool configuration can be a network configuration or a pre-configured configuration. After the above resource exclusion, the remaining resources of resource set A are M total If the value is less than X%, increase the SL-RSRP threshold by 3dB and repeat step 1. The possible values ​​for X are {20, 35, 50}, and the terminal's required resource pool configuration includes a correspondence between priority and the possible values ​​of X above. The terminal determines the value of X based on the priority of the data waiting to be transmitted and this correspondence.

[0038] In step 2, the terminal's MAC layer randomly selects a resource from the reported candidate resource set and sends data. That is, the terminal randomly selects a resource from the candidate resource set and sends data.

[0039] Regarding the slot structure in the NR-V2X In NR-V2X, PSSCH and its associated PSCCH are transmitted in the same slot, and PSCCH occupies two or three time-domain symbols (which may be abbreviated as symbols). Time-domain resource allocation in NR-V2X is based on the slot allocation granularity. The parameters sl-startSLsymbols and sl-lengthSLsymbols define the start point and length of time-domain symbols used for sidelink transmission (or sidelink communication, abbreviated as SL) within a single slot. The last symbol in this section is used as the guard period (GP), and PSSCH and PSCCH can only use the remaining time-domain symbols. However, if a Physical Sidelink Feedback Channel (PSFCH) transmission resource is configured in a single slot, PSSCH and PSCCH cannot occupy the time-domain symbols used for PSFCH transmission, nor the automatic gain control (AGC) and GP symbols preceding those symbols. The AGC symbol refers to the symbol where AGC is located (or occupied), and the GP symbol refers to the symbol where GP is located.

[0040] As shown in Figure 3, the network configures sl-StartSymbol = 3 and sl-LengthSymbols = 11. That is, within one slot, 11 time-domain symbols starting from symbol index 3 are available for sidelink transmission. A PSFCH transmission resource exists in this slot, and this PSFCH occupies symbols 11 and 12, of which symbol 11 is used as the AGC symbol for the PSFCH, and symbols 10 and 13 are used as GP, respectively. The time-domain symbols available for PSSCH transmission are symbols 3 to 9, and the PSCCH occupies three time-domain symbols, namely symbols 3, 4, and 5, with symbol 3 being normally used as the AGC symbol.

[0041] In NR-V2X, a PSCCH, PSSCH, and PSFCH may exist within a single sidelink slot. Within a single slot, the first time-domain symbol is fixedly used for AGC, and on the AGC symbol, the terminal replicates the information transmitted on the second symbol. Finally, one symbol is reserved at the end of the slot for transmit / receive switching, used when the terminal switches from transmit (or receive) to receive (or transmit). In the remaining time-domain symbols, the PSCCH can occupy two or three time-domain symbols starting from the second time-domain symbol. In the frequency domain, if the number of physical resource blocks (PRBs) occupied by the PSCCH is within the range of a single PSSCH subband, and the number of PRBs occupied by the PSCCH is smaller than the size of one subchannel of the PSSCH, or if the frequency-domain resources of the PSSCH include multiple subchannels, then frequency division multiplexing (FDM) is possible between the PSCCH and PSSCH on the time-domain symbol where the PSCCH is located.

[0042] PSSCH is used to carry second-stage sidelink control information (SCI) and sidelink shared channel (SL-SCH). 3GPP R16 defines two second-stage SCI formats: SCI format 2-A and SCI format 2-B. SCI format 2-B is applied to multicast communication schemes that perform sidelink HARQ feedback based on distance information. SCI format 2-A is applied to other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication schemes that require sidelink HARQ feedback, and multicast communication schemes that require acknowledgment (ACK) or negative acknowledgment (NACK) feedback. 3GPP R17 further introduces SCI format 2-C as a second-stage SCI format, used to indicate reference resource sets and trigger signaling in specific situations. The modulation symbols of the second-stage SCI begin mapping from the first symbol where the PSSCH DMRS is located, using a frequency-domain priority, time-domain-later method. On this symbol, the PSSCH DMRS resource element (RE) is multiplexed using an interlacing method. Furthermore, the modulation symbols of the second-stage SCI cannot be mapped to the RE where the PT-RS is located, as shown in Figure 4. PSSCH DMRS refers to the Demodulation Reference Signal (DMRS) corresponding to the PSSCH.

[0043] In sidelink communication systems, terminals either autonomously select resources or determine transmission resources based on the network's sidelink resource scheduling, and in either case, different terminals may transmit PSCCH on the same time-frequency resource. To ensure that the receiving end can detect at least one PSCCH even if PSCCH resources collide, LTE-V2X employs a randomization design for PSCCH DMRS. PSCCH DMRS refers to the DMRS corresponding to a PSCCH. Specifically, when a terminal transmits a PSCCH, it can randomly select one value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple terminals transmit PSCCH DMRS on the same time-frequency resource and employ different cyclic shifts, the receiving terminal can detect at least one PSCCH using orthogonal DMRS. For a similar purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCCs) that transmitting terminals can randomly select. Table 1 shows the OCC mask for 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 purpose of distinguishing different terminals. DMRS RE refers to the RE where the DMRS (referring to PSCCH DMRS) is located.

[0044] [Table 1]

[0045] The PSSCH DMRS in NR-V2X is based on the design of the NR Uu interface and employs multiple time-domain PSSCH DMRS patterns (abbreviated as time-domain DMRS patterns or DMRS patterns). The number of available DMRS patterns within a single resource pool is related to the number of PSSCH symbols in the resource pool (i.e., the number of symbols occupied by PSSCH). For a specific number of PSSCH symbols (including the first AGC symbol) and PSSCH symbol count, the available DMRS patterns and the positions of each DMRS symbol within the patterns are shown in Table 2. Figure 5 shows a schematic diagram of the time-domain positions of four DMRS symbols when the number of PSSCH symbols is 13, with 4 DMRS symbols and DMRS symbol positions 1, 4, 7, and 10, respectively.

[0046] [Table 2]

[0047] When multiple time-domain DMRS patterns are configured within a resource pool, the specific time-domain DMRS pattern to be adopted is selected by the transmitting terminal and indicated by the first-stage SCI. This design allows fast-moving terminals to select high-density DMRS patterns, thereby ensuring accuracy in channel estimation. Conversely, slow-moving terminals can adopt low-density DMRS patterns, thereby improving spectral efficiency.

[0048] The generation methods for PSSCH DMRS sequences and PSCCH DMRS sequences are almost identical, the only difference being the initialization formula C of the pseudo-random sequence c(m). init In,

number

[0049] NR PDSCH and PUSCH support two types of frequency-domain DMRS patterns: DMRS frequency-domain type 1 and DMRS frequency-domain type 2. Each frequency-domain type has two distinct forms: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency-domain type 1 supports four DMRS ports, single-symbol DMRS frequency-domain type 2 supports six DMRS ports, and double-symbol DMRS symbols support twice the number of ports. However, in NR-V2X, since the 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.

[0050] Regarding the determination of frequency domain resources for NR-V2X Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the allocation granularity of frequency domain resources is subchannel. The number of PRBs contained in one subchannel is {10, 12, 15, 20, 50, 75, 100}, with the smallest subchannel size being 10PRB, which is much larger than the smallest subchannel size of LTE-V2X, which is 4PRB. This is mainly because in NR-V2X, the frequency domain resources of a PSCCH are located within the first subchannel of its associated PSSCH, and the frequency domain resources of a PSCCH are less than or equal to the size of one subchannel of the PSSCH, while the time domain resources of a PSCCH occupy two or three time domain symbols. When the subchannel size is configured to be small, the available resources of the PSCCH become very small, the coding rate increases, and the detection performance of the PSCCH decreases. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but it is necessary to ensure that the PSCCH frequency domain resource is 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 pool.

[0051] Subchannel size (sl-SubchannelSize): Indicates the number of consecutive PRBs contained in a single subchannel within the resource pool, with a range of {10, 12, 15, 20, 50, 75, 100} PRBs.

[0052] Number of subchannels (sl-NumSubchannel): Indicates the number of subchannels included in the resource pool.

[0053] Subchannel Start RB Index (sl-StartRB-Subchannel): Indicates the start PRB index of the first subchannel in the resource pool.

[0054] PRB count (sl-RB-Number): Indicates the number of consecutive PRBs included in the resource pool.

[0055] PSCCH frequency domain resource indication (sl-FreqResourcePSCCH): Indicates the frequency domain resource size of the PSCCH, with a range of {10, 12, 15, 20, 25}PRB.

[0056] When a terminal determines the resource pool to be used for PSSCH transmission and reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels, starting with the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs included 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 and reception.

[0057] In NR-V2X, the starting positions of the frequency domains of the first subchannels of the PSCCH and its associated PSSCH are aligned; therefore, the starting position of each PSSCH subchannel is the starting position of the frequency domain of the PSCCH. Based on the above parameters, the frequency domain ranges of the PSCCH and PSSCH resource pools can be determined. As an example, Figure 7 shows the frequency domain ranges of the PSCCH and PSSCH resource pools in NR-V2X.

[0058] In NR-V2X, the PSCCH is used to sense and transmit relevant sidelink control information, which includes one or more of the following information, namely: Prioritization of scheduled transmissions Frequency domain resource allocation, which indicates the number of frequency domain resources for PSSCH in the current slot scheduled by PSCCH, and the number of frequency domain resources and start positions for up to two reserved retransmission resources. Time-domain resource allocation indicating the time-domain location of up to two retransmission resources. PSSCH reference signal pattern, Stage 2 SCI format, Second stage SCI coding rate offset, and, PSSCH DMRS port count, Modulation and Coding Scheme (MCS), MCS table instructions, PSFCH symbol count, Resource reservation cycle, where a resource is reserved to send another TB in the next cycle, and if TB-to-TB resource reservation is not active in the resource pool configuration, this information bit field does not exist, resource reservation cycle, and Reserved bits, consisting of 2 to 4 bits, the specific number of bits is determined by the network or includes one or more pieces of reserved bits.

[0059] Since PSCCH is always transmitted within the same slot as the scheduled PSSCH, and the start position of the PRB occupied by PSCCH is the start position of the first subchannel of the scheduled PSSCH, SCI format 1-A does not explicitly indicate the start position of the time-frequency domain of the scheduled PSSCH.

[0060] Regarding the determination of time domain resources (slots) for NR-V2X In NR-V2X, PSCCH / PSSCH transmission is slot-level based; that is, only one PSCCH / PSSCH can be transmitted per slot, and transmission of multiple PSCCH / PSSCH using the TDM method within a single slot is not supported. PSCCH / PSSCH between different users can be multiplexed using the FDM method within a single slot. While the time-domain resource of a PSSCH in NR-V2X is slot-level granularity, unlike LTE-V2X where a PSSCH occupies all time-domain symbols within a single subframe, a PSSCH in NR-V2X can occupy only a portion of the symbols within a single slot. This is mainly because, in LTE systems, both uplink and downlink transmissions use subframes as granularity, and therefore sidelink transmissions also use subframes as granularity (special subframes in TDD systems are not used for sidelink transmission). On the other hand, the NR system employs a flexible slot structure, meaning that both uplink and downlink symbols are included in a single slot, allowing for more flexible scheduling and reduced latency. A typical subframe of the NR system is shown in Figure 8. The slots contain downlink symbols (Downlink, DL), uplink symbols (Uplink, UL), and flexible symbols. Downlink symbols are located at the beginning of the slot, uplink symbols at the end of the slot, and flexible symbols are located between the downlink and uplink symbols. The number of each type of symbol in each slot is configurable.

[0061] Sidelink transmission systems can share carriers with cellular systems, in which case sidelink transmission can only use the uplink transmission resources of the cellular system. NR-V2X requires that if sidelink transmission occupies all time-domain symbols within a slot, the network must configure slots for full uplink symbols for sidelink transmission. This significantly impacts uplink and downlink data transmission in the NR system, degrading system performance. Therefore, NR-V2X supports the use of only a portion of time-domain symbols within a slot for sidelink transmission; that is, only a portion of the uplink symbols within a slot are used for sidelink transmission. Furthermore, considering that sidelink transmission includes AGC and GP symbols, if the number of available uplink symbols for sidelink transmission is small, even fewer symbols remain for transmitting valid data (excluding AGC and GP symbols), resulting in very low resource utilization. Therefore, in NR-V2X, sidelink transmission occupies at least seven time-domain symbols (including GP symbols). When a sidelink transmission system uses a dedicated carrier, there is no problem of sharing transmission resources with other systems, so all symbols in a slot can be configured to be used for sidelink transmission.

[0062] As mentioned above, in NR-V2X, the start point and length of the time-domain symbols used for sidelink transmission within a single slot are configured by the parameters sl-StartSymbols (start symbol position) and sl-LengthSymbols (number of symbols). The last symbol in the time-domain symbols for sidelink transmission is used as GP, and PSSCH and PSCCH can only use the remaining time-domain symbols. However, if a PSFCH transmission resource is configured in a single slot, PSSCH and PSCCH cannot occupy the time-domain symbols for PSFCH transmission, nor the AGC and GP symbols preceding those symbols.

[0063] In the NR-V2X system, time-domain resources in the resource pool are also represented by bitmaps. Considering the flexible slot structure of the NR system, the bitmap length has also been extended, with a supported bitmap length range of [10:160]. The method for determining the location of slots belonging to a resource pool within a single SFN period using bitmaps is the same as in LTE-V2X, but differs in the following two points:

[0064] 1) The total number of slots included in one SFN cycle is 10240 × 2 μ Here, the parameter μ is related to the size of the subcarrier spacing.

[0065] 2) If at least one of the time-domain symbols Y, Y+1, Y+2, ..., Y+X-1 contained in a slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, that slot cannot be used for sidelink transmission. Here, Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0066] Determining the time domain resources of a resource pool specifically involves the following steps:

[0067] In step 1, slots that do not belong to the resource pool within the SFN period, such as synchronous slots and slots that cannot be used for sidelink transmission, are excluded. The remaining slots are represented as the residual slot set, and the residual slots are

number

[0068] Here, N S_SSB This represents the number of synchronization slots within a single SFN cycle. The number of synchronization slots is determined based on synchronization configuration parameters and is related to the cycle in which SSB is transmitted and the number of SSB transmission resources configured within that cycle.

[0069] N nonSL This represents the number of slots within an SFN period that do not fit the configuration regarding the start point and number of uplink symbols. If at least one time-domain symbol among the time-domain symbols Y, Y+1, Y+2, ..., Y+X-1 contained in a slot is not semi-statically configured as an uplink symbol, that slot cannot be used for sidelink transmission. Here, Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0070] In step 2, the number of reservation slots and their corresponding time domain locations are determined.

[0071] If the number of slots in the remaining slot set is not divisible by the bitmap length, it is necessary to determine the number of reserved slots and their corresponding time domain positions. Specifically, for a given slot l r (0≦r<10240×2 μ -N S_SSB -N nonSL A slot is reserved if it meets the following conditions:

number

[0072] In step 3, reserved slots are excluded from the remaining slot set, and the remaining slot set is represented as a logical slot set. All slots in this slot set are slots available to the resource pool, and the slots in the logical slot set are

number

[0073] In step 4, the slots belonging to the resource pool within the logical slot set are determined based on the bitmap.

[0074] The bitmap in the resource pool configuration information is (b0,b1,…,b Lbitmap-1 ) is a slot within a set of logical slots.

number

[0075] In step 5, the slots belonging to the resource pool determined in step 4

number

number

number

[0076] About downlink-based positioning In downlink-based positioning, a single terminal can be provided with up to four Downlink Positioning Reference Signal (DL PRS) configurations across its frequency layers. The parameter structure of each frequency layer provides the following PRS configuration parameters, namely: PRS subcarrier spacing, The length of the PRS cyclic prefix (CP), The frequency-domain bandwidth of the PRS is the number of PRBs assigned to the PRS signal, where the minimum value of the PRS resource bandwidth is 24 PRBs, the granularity is 4 PRBs, and the maximum value is 272 PRBs. A frequency-domain starting frequency position of a PRS resource for defining the index number of the starting PRB to which the PRS signal is assigned in the frequency domain, wherein the index number of the PRB is defined relative to Point A of the PRS. PRS frequency domain reference point Point A, and A configuration parameter called Comb-N for the PRS comb size is provided.

[0077] The above PRS parameters configured within each positioning frequency layer apply to all PRS resources included in that positioning frequency layer. This means that within a single positioning frequency layer, all PRS signals from multiple different Transmission and Receiving Points (TRPs) use the same subcarrier spacing and CP length, the same comb size, are transmitted in the same frequency subband, and occupy the exact same bandwidth. Such a design allows a terminal to simultaneously receive and measure PRS signals from multiple different TRPs transmitted on the same frequency point.

[0078] The parameters of the TRP layer include an ID parameter to uniquely identify this positioning TRP, the physical cell ID of this TRP, the NR Cell Global Identifier (NCGI) of this TRP, and the Absolute Radio Frequency Channel Number (ARFCN) of this TRP. Within each TRP layer, up to two DL PRS resource sets can be configured. The layer parameter called DL PRS resource set is configured with the following parameters, and these parameters apply to all DL PRS resources included in this resource set.

[0079] DL PRS Resource Set Identifier ID (nr-DL-PRS-ResourceSetID).

[0080] DL PRS Transmission Period and 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 configurable DL PRS transmission period is 4 milliseconds, and the maximum is 10240 milliseconds. DL PRS configuration supports flexible subcarrier intervals including 15 kHz, 30 kHz, 60 kHz, and 120 kHz. The range of configurable DL PRS transmission period values ​​remains the same even with different subcarrier intervals. Figure 9 shows a schematic diagram with a comb size of 2 and RE offsets of 0 and 1.

[0081] DL PRS Resource Repetition Factor (dl-PRS-ResourceRepetitionFactor): This parameter defines the number of times a single PRS resource is transmitted repeatedly within each PRS cycle. Repeated transmission of the same DL PRS resource can be used by a terminal to aggregate the energy of multiple transmissions of the DL PRS signal, extending the DL PRS coverage distance and improving positioning accuracy. In FR2 systems, repeated transmission of DL PRS resources can be used by a terminal to perform a received beam scan operation. The terminal can receive repeated transmissions of the same DL PRS resource using different received beams and find the optimal TRP transmit beam that matches the terminal's received beam. On the other hand, repeated transmission of DL PRS resources increases the PRS overhead. According to the 3GPP NR R16 specification, the values ​​for the DL PRS resource repetition factor are 1, 2, 4, 6, 8, 16, and 32.

[0082] DL PRS Resource Repeat Transmission Time Gap (dl-PRS-ResourceTimeGap): This parameter defines the number of slots between two consecutive repeated transmissions for the same PRS resource.

[0083] DL PRS Muting Configuration: This parameter is used to define when a DL PRS signal is not transmitted on a specific allocated time-frequency resource (this is called muting). Muting means that the DL PRS signal is intentionally not transmitted on a specific designated time-frequency resource, rather than being transmitted on all allocated time-frequency resources. The purpose of doing this is to avoid collisions with other signals, such as SSB, on the one hand, and to avoid interference between signals transmitted on different TRPs on the other hand. For example, by intentionally turning off DL PRS transmission on a specific TRP at a certain time, a terminal can receive DL PRS signals from a more distant TRP. The muting operation of the PRS will be explained in detail later, so it will not be explained here.

[0084] Number of time-domain symbols occupied by DL PRS resources (dl-PRS-NumSymbols): This parameter defines the number of time-domain symbols allocated within a single slot by one DL PRS resource.

[0085] As mentioned above, all parameters configured in a layered structure, namely a single DL PRS resource set, apply to all DL PRS resources included in that resource set. Therefore, all DL PRS resources within the same DL PRS resource set are transmitted at the same frequency, have the same number of repeated transmissions, and occupy the same number of time-domain symbols.

[0086] Each DL PRS resource is configured with the following parameters:

[0087] A single DL PRS resource identification ID (nr-DL-PRS-ResourceID).

[0088] DL PRS Sequence ID (dl-PRS-SequenceID).

[0089] DL PRS Start Frequency Domain Resource Unit Offset (dl-PRS-CombSizeN-AndReOffset): This parameter defines the frequency domain resource unit offset value used for resource mapping DL PRS resources on the first allocated time domain symbol within a single slot. Based on this parameter and the relative offset values ​​specified in TS38.211, the terminal can determine the frequency domain resource unit offset value used for resource mapping on each time domain symbol.

[0090] DL PRS Resource Slot Offset (dl-PRS-ResourceSlotOffset): This parameter defines the slot offset for the DL PRS resource set. This parameter allows you to determine the slot location where each DL PRS resource resides.

[0091] DL PRS Time Domain Symbol Offset (dl-PRS-ResourceSymbolOffset): This parameter defines the allocation position of a time-frequency resource within a single slot for a single DL PRS resource. It indicates the index number of the starting time-domain symbol within that slot.

[0092] DL PRS QCL Information (dl-PRS-QCL-Info): This parameter provides quasi-colocation information (QCL) for the DL PRS signal.

[0093] Regarding side-link transmission (SLU) in the unlicensed spectrum When performing sidelink transmission over the unlicensed spectrum (SL-U), sidelink transmission must meet specific regulatory requirements, including the requirements for Occupied Channel Bandwidth (OCB) and Power Spectral Density (PSD). For OCB, when a terminal uses the channel to transmit data, the occupied channel bandwidth must not be less than 80% of the single channel bandwidth. For Power Spectral Density, the power transmitted by the terminal per MHz must not exceed 10 dBm. To meet the OCB and PSD regulatory requirements, sidelink transmission over the unlicensed spectrum must employ an Interlaced Resource Block (IRB) structure. One IRB contains N discrete RBs in the frequency domain, and a total of M IRBs are contained within the bandwidth. The RBs in the m-th IRB are {m, M+m, 2M+m, 3M+m, ...}.

[0094] As shown in Figure 10, the system bandwidth contains 20 RBs, including 5 IRBs (i.e., M=5). Each IRB contains 4 RBs (i.e., N=4), and the frequency domain spacing between two adjacent RBs belonging to the same IRB is the same, i.e., they are 5 RBs apart. The numbers in the square boxes in the figure indicate the IRB index.

[0095] In an SL-U system, when adopting an IRB-based resource allocation granularity, all channels in the SL-U system, such as PSCCH and PSSCH, should be based on an IRB structure. In this case, the frame structure of the SL-U system is shown in Figure 11, where the numbers in the square boxes indicate the IRB index. Figure 11 is a schematic diagram of a frame structure that contains only PSCCH and PSSCH and no PSFCH in the slot. The bandwidth shown in the figure contains 20 RBs and consists of 5 IRB resources, i.e., M=5, and each IRB resource contains 4 RBs. The numbers in the square boxes indicate the IRB index. In Figure 11, the system is configured so that PSCCH occupies one IRB resource and occupies two time-domain symbols in the time domain. PSSCH uses IRB as its granularity, with the first symbol in the slot being the AGC symbol and the last symbol being the GP symbol. In Figure 11, PSSCH1 occupies IRB#0 and IRB#1, and the corresponding PSCCH1 occupies IRB#0. PSSCH2 occupies IRB#2, and its corresponding PSCCH2 also occupies IRB#2. For simplicity, the resources occupied by the second-stage SCI, and the resources occupied by PSCCH DMRS and PSSCH DMRS are not shown in the diagram.

[0096] As shown in Figure 12, on the unlicensed spectrum, terminals access channels via Listen Before Talk (LBT). LBT has a granularity of 20 MHz in the frequency domain, and each 20 MHz is called an RB Set. A single carrier can contain multiple RB Sets, and there is a guard period between RB Sets.

[0097] On the unlicensed spectrum, a terminal must first perform a Limit Break Test (LBT), and only after successfully completing the LBT can it access the channel. However, the time it takes for a terminal to complete the LBT is uncertain. If a terminal is restricted to transmitting only from the start of a slot, it may miss transmission opportunities because it has not yet completed the LBT. Therefore, SL-U considers adding transmission start points within a single slot, i.e., multi-start point transmission, where, for example, an additional start point could be a third or fourth time-domain symbol within the slot.

[0098] Regarding positioning based on side links In related technologies, research was conducted on "Enhancing NR Positioning" and "Scenarios and Requirements for NR Positioning Use Cases within Coverage, Partial Coverage, and Outside Coverage." The research on "Scenarios and Requirements for NR Positioning Use Cases within Coverage, Partial Coverage, and Outside Coverage" focused on V2X and public safety use cases. Furthermore, requirements for "Distance-Based Services" were defined in related technologies, and positioning accuracy requirements for Industrial Internet of Things (IIoT) usage in outside-coverage scenarios were defined. 3GPP needs to research and develop side-link positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0099] To improve positioning accuracy, particularly for terminals located outside cellular network coverage, 3GPP conducted feasibility and performance studies on SL PRS-based positioning technologies. Next, solutions based on sidelink positioning (including ranging / angulation) in NR systems will be standardized. This includes, but is not limited to, the following:

[0100] Standardize SL PRS. SL PRS uses a comb-based frequency domain structure (without excluding all RE mapping modes), employs a pseudo-random-based sequence format, uses existing DL-PRS sequences as a design starting point, and supports an SL PRS bandwidth of up to 100 MHz in FR1.

[0101] The resource allocation method for SL PRS will be standardized. This includes two resource allocation methods: Method 1, which corresponds to the allocation of SL PRS resources by the network, and Method 2, which corresponds to the autonomous selection of SL PRS resources by terminals. For Method 2, it is necessary to study and standardize resource selection based on channel sensing, and / or random resource selection, congestion control, and / or terminal cooperation.

[0102] With the introduction of SL PRS into sidelink communication systems, it is necessary to consider how to transmit SL PRS. Currently, further improvements are needed regarding how to multiplex SL PRS with other physical channels in sidelink communication systems. For this reason, the following technical solutions in the embodiments of this application are proposed.

[0103] In this specification, the terms “system” and “network” are often used interchangeably. In this specification, the term “and / or” describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, or B exists alone. Also in this specification, the letter “ / ” generally indicates that the preceding and succeeding related objects are in an “or” relationship. In this specification, the terms “symbol” and “time-domain symbol” are often used interchangeably, and optionally, a symbol and a time-domain symbol can be OFDM symbols.

[0104] To facilitate understanding of the technical solutions of the embodiments of this application, the technical solutions of this application will be described in detail below through specific embodiments. The related technologies described above can be optionally combined with the technical solutions of the embodiments of this application as selectable solutions, and all of them fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least some of the following:

[0105] It should be noted that the technical solutions of the embodiments of this application are applicable to both the licensed and unlicensed spectrums.

[0106] It should be explained that the technical solution of the embodiment of this application is applicable to SL PRS-based positioning scenarios. Here, in an SL PRS-based positioning scenario, the SL PRS resource pool supports the sharing of the resource pool between SL PRS and Rel-16 / 17 / 18 sidelink communication, and also supports a dedicated resource pool for SL PRS. Here, the sharing of the resource pool between SL PRS and Rel-16 / 17 / 18 sidelink communication can be understood as the sharing of the resource pool between SL PRS and PSCCH / PSSCH. The dedicated resource pool for SL PRS can be understood as a resource pool dedicated to SL PRS.

[0107] Figure 13 is a flowchart 1 of a sidelink transmission method provided in an embodiment of this application. As shown in Figure 13, the sidelink transmission method includes the following steps.

[0108] In step 1301, the terminal transmits or receives an SL PRS, which is generated by an SL PRS sequence, which is generated based on the lower L bit of the CRC of the PSCCH or based on an ID determined by the upper layer of the transmitting terminal. L is a non-negative integer.

[0109] Here, "transmitting terminal" refers to the terminal that sends the SL PRS. Correspondingly, "receiving terminal" refers to the terminal that receives the SL PRS.

[0110] In some embodiments, when the SL PRS needs to be used to measure the SL RSRP in the resource sensing process, the SL PRS sequence is generated based on the lower L bit of the CRC of the PSCCH, for example, L=12, but not limited to this, and L can take other values. In other cases (i.e., when the SL PRS does not need to be used to measure the SL RSRP in the resource sensing process), the SL PRS sequence is generated based on an ID determined by the upper layer of the transmitting terminal.

[0111] For example, in a dedicated SL PRS resource pool, when the terminal's autonomous resource selection mode is employed within the resource pool, and the SL PRS is configured within the resource pool as the measurement reference signal for the SL RSRP in the resource sensing process, then the SL PRS needs to be used for measuring the SL RSRP in the resource sensing process, and the SL PRS sequence is generated based on the lower L bit of the CRC of the PSCCH, for example, L=12. In other cases, the SL PRS sequence is generated based on an ID determined by the upper layer of the transmitting terminal.

[0112] In some embodiments, in positioning based on SL PRS, whether it is a shared resource pool or a dedicated SL PRS resource pool, the SL PRS sequence is generated based on the following formula, i.e.,

number

number

number

number

number

number

[0113] For example, in a dedicated SL PRS resource pool, if the terminal's autonomous resource selection mode is adopted within the resource pool, PSCCH DMRS or SL PRS can be used as the measurement reference signal for SL RSRP in the resource sensing process, based on the resource pool configuration or pre-configuration information. If at least SL PRS is configured as the measurement reference signal for SL RSRP in the resource sensing process within the resource pool,

number

number

number

number

[0114] The above solution clarifies the method for generating SL PRS sequences, and further improves the positioning scenario based on SL PRS.

[0115] Figure 14 is a flowchart 2 of a sidelink transmission method provided in an embodiment of this application. As shown in Figure 14, the sidelink transmission method includes the following steps.

[0116] In step 1401, the terminal transmits or receives a physical channel with the SL PRS. The physical channel includes PSCCH and / or PSSCH. Here, the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed within the same slot.

[0117] Here, since PSCCH and / or PSSCH belong to the category of Rel-16 / 17 / 18 sidelink communication, the sharing of a resource pool between SL PRS and the physical channel (PSCCH and / or PSSCH) can be understood as the sharing of a resource pool between SL PRS and Rel-16 / 17 / 18 sidelink communication.

[0118] In the embodiment of this application, when the SL PRS and the physical channel share a resource pool, the SL PRS and the physical channel can be multiplexed within the same slot.

[0119] Here, the ability of SL PRS and physical channels to be multiplexed within the same slot includes, but is not limited to, the following cases.

[0120] In some embodiments, the SL PRS and PSCCH are multiplexed within the same slot, and the SL PRS is scheduled by the PSCCH; that is, the PSCCH and the scheduled SL PRS are multiplexed within a single slot.

[0121] In some embodiments, the SL PRS, PSCCH, and PSSCH are multiplexed within the same slot, and the SL PRS and PSSCH are scheduled by the PSCCH; that is, the PSCCH and the scheduled SL PRS and PSSCH are multiplexed within a single slot.

[0122] It should be explained that the DMRS corresponding to PSCCH is called PSCCH DMRS, and PSCCH DMRS exists on all PSCCH symbols and is frequency-division multiplexed with PSCCH on PSCCH symbols. A PSCCH symbol refers to the time-domain symbol on which PSCCH resides. Therefore, it can be understood that a PSCCH DMRS exists on each time-domain symbol on which PSCCH resides. The time-domain symbol on which PSCCH resides is, in other words, the time-domain symbol on which PSCCH DMRS resides, and the time-domain symbol on which PSCCH DMRS resides is, in other words, the time-domain symbol on which PSCCH resides.

[0123] It should be explained that the DMRS corresponding to PSSCH is called PSSCH DMRS, and PSSCH DMRS exists on some or all PSSCH symbols, and is frequency-division multiplexed with PSSCH on those some or all PSSCH symbols. A PSSCH symbol refers to the time-domain symbol on which PSSCH exists. Therefore, it can be understood that a PSSCH DMRS may or may not exist on the time-domain symbol on which PSSCH is located. The time-domain symbol on which PSSCH DMRS exists is always the same time-domain symbol on which PSSCH exists, but the time-domain symbol on which PSSCH exists is not necessarily the same time-domain symbol on which PSSCH DMRS exists.

[0124] Therefore, when SL PRS and PSCCH are multiplexed within the same slot, it can be understood that this actually means SL PRS, PSCCH, and PSCCH DMRS are multiplexed within the same slot. When SL PRS, PSCCH, and PSSCH are multiplexed within the same slot, it actually means SL PRS, PSCCH, PSCCH DMRS, PSSCH, and PSSCH DMRS are multiplexed within the same slot.

[0125] It should be explained that PSCCH is used to transport the first stage SCI, and PSSCH is used to transport the second stage SCI and / or SL-SCH.

[0126] For details regarding the time-frequency resources occupied by PSCCH and PSSCH, please refer to the explanation of the related technologies mentioned above.

[0127] It should be noted that, in the mapping operations described in the embodiments of this application, the information transmitted in the first time-domain symbol used for sidelink transmission within a slot should be duplicated in the time-domain symbol preceding the first time-domain symbol, which can be understood as an AGC symbol. In some embodiments, the sidelink transmission includes at least one of PSSCH, PSCCH, PSSCH DMRS, PSCCH DMRS, SL PRS, and PT-RS.

[0128] In some embodiments, the SL PRS includes a first-class SL PRS and / or a second-class SL PRS.

[0129] A Type 1 SL PRS refers to an SL PRS transmitted on a Type 1 time-domain symbol, and a Type 1 time-domain symbol refers to the time-domain symbol in the slot where the PSCCH is located.

[0130] A Type II SL PRS refers to an SL PRS transmitted over a Type II time-domain symbol, and a Type II time-domain symbol refers to a time-domain symbol in a slot that does not include PSCCH and / or PSSCH DMRS.

[0131] In some embodiments, the comb size of the first type SL PRS is smaller than the comb size of the second type SL PRS.

[0132] In some embodiments, the comb size of the first type SL PRS is equal to the comb size of the second type SL PRS.

[0133] For example, the comb size of a Type 1 SL PRS is equal to 1, and the comb size of a Type 2 SL PRS is greater than 1.

[0134] Here, a smaller comb size indicates a higher density of SL PRS distribution in the frequency domain. When the comb size is equal to 1, SL PRS are distributed on each RE in the frequency domain. When the comb size is equal to X (where X is an integer greater than 1), SL PRS are distributed for every X REs in the frequency domain.

[0135] Here, the methods by which the terminal transmits the SL PRS include at least one of the following:

[0136] Method 1) The terminal can transmit two types of SL PRS, namely Type 1 SL PRS and Type 2 SL PRS.

[0137] In one selectable embodiment, when the PSSCH is used to transport only the second-stage SCI, the SL PRS includes a first-kind SL PRS and a second-kind SL PRS. That is, when the PSSCH is used to transport only the second-stage SCI, the terminal can transmit a first-kind SL PRS and a second-kind SL PRS.

[0138] Method 2) The terminal can only transmit Type 1 SL PRS.

[0139] In one selectable embodiment, when SL PRS and PSCCH are multiplexed within the same slot, i.e., when there is no PSSCH in the slot, SL PRS includes only Type 1 SL PRS.

[0140] Method 3) The terminal can only transmit Type 2 SL PRS.

[0141] In one selectable embodiment, when the PSSCH is used to transport the second-stage SCI and SL-SCH, the SL PRS includes only the second-type SL PRS. That is, when the PSSCH is used to transport the second-stage SCI and SL-SCH, the terminal can transmit only the second-type SL PRS.

[0142] As an example, as shown in Figure 15, the following content is multiplexed within a single slot: PSCCH, PSCCH DMRS, PSSCH, PSSCH DMRS, Type 1 SL PRS, and Type 2 SL PRS are multiplexed. Here, although PSCCH DMRS is not shown in Figure 15, in reality, PSCCH DMRS and PSCCH are frequency-division multiplexed on the PSCCH symbol (i.e., symbols 1, 2, and 3). On symbols 1, 6, and 11, PSCCH DMRS and PSSCH are frequency-division multiplexed. The time-domain symbols where Type 1 SL PRS is located (i.e., symbols 2 and 3) are the time-domain symbols where PSCCH is located. The time-domain symbols where Type 2 SL PRS is located (i.e., symbols 4, 5, 7-10) are time-domain symbols that do not contain PSCCH or PSSCH DMRS.

[0143] As an example, as shown in Figure 16, the following content is multiplexed within a single slot: PSCCH, PSCCH DMRS, PSSCH, PSSCH DMRS, and Type II SL PRS are multiplexed. Here, although PSCCH DMRS is not shown in Figure 16, in reality, PSCCH DMRS and PSCCH are frequency-division multiplexed on the PSCCH symbol (i.e., symbols 1, 2, and 3). On symbols 1, 6, and 11, PSSCH DMRS and PSSCH are frequency-division multiplexed. The time-domain symbols where Type II SL PRS is located (i.e., symbols 4, 5, 7-10) are time-domain symbols that do not contain PSCCH or PSSCH DMRS.

[0144] Depending on the method by which the terminal transmits the SL PRS, the terminal may determine the method of transmitting the SL PRS based on standard specifications (or protocol arrangements) or configuration information or pre-configured information within the resource pool.

[0145] In some embodiments, the time-domain symbols used for transmitting a Type II SL PRS are determined by at least one of the following methods: network configuration, pre-configuration, or terminal implementation. Here, terminal implementation refers to the terminal's MAC layer determining the time-domain symbols used for transmitting a Type II SL PRS and instructing the terminal's physical layer accordingly.

[0146] For example, a terminal can determine the time-domain symbol used for transmitting a Type 2 SL PRS based on resource pool configuration information (which is configured by the network).

[0147] For example, a terminal can determine the time-domain symbols used for transmitting a Type II SL PRS based on pre-configuration information of the resource pool (this pre-configuration information is defined by a standard or agreed upon in a protocol).

[0148] For example, the physical layer of the terminal determines the time-domain symbol used for transmitting a Type II SL PRS based on instructions from the MAC layer.

[0149] In some embodiments, the time-domain symbols used for transmitting a Type II SL PRS satisfy one or more of the following requirements:

[0150] If a PSFCH resource is configured within a slot, the last Y time-domain symbols available for sidelink communication within that slot cannot be used for transmitting a Type II SL PRS. Y is an integer greater than 0, for example, Y=4.

[0151] The time-domain symbols used for Type 2 SL PRS transmission are the time-domain symbols used for sidelink communication within the slot, excluding the first and / or last time-domain symbols.

[0152] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that do not include PSCCH.

[0153] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that do not include PSSCH DMRS.

[0154] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that are not occupied by the second-stage SCI.

[0155] The first time-domain symbol in the time-domain symbols used for transmitting a Type 2 SL PRS is time-domain symbol N+n1. Time-domain symbol N is the first time-domain symbol after the last time-domain symbol where PSCCH is located, and where PSSCH DMRS does not exist, and n1 is a non-negative integer.

[0156] The time-domain symbol used for transmitting a Type 2 SL PRS is a time-domain symbol that is at least n2 away from any time-domain symbol containing a PSSCH DMRS, following time-domain symbol N. Time-domain symbol N is the first time-domain symbol that does not contain a PSSCH DMRS, following the last time-domain symbol containing a PSCCH, where n2 is an integer greater than 0.

[0157] The time-domain symbols used for sidelink communication within a slot can be determined based on parameters such as the starting symbol position (sl-startSLsymbols) and the number of symbols (sl-lengthSLsymbols). For details on sl-startSLsymbols and sl-lengthSLsymbols, please refer to the explanation of related technologies mentioned above.

[0158] It should be explained that the requirements that the time-domain symbols used for Type II SL PRS transmission must satisfy can be implemented in any combination or individually, and the terminal can determine the time-domain symbols used for Type II SL PRS transmission based on the above requirements. Several possible implementations are listed below, which are methods for determining the time-domain symbols used for Type II SL PRS transmission.

[0159] Method 1) The time domain symbols used for Type 2 SL PRS transmission are the time domain symbols within the slot that do not contain PSSCH DMRS and are not occupied by the second stage SCI, excluding the first and last time domain symbols used for sidelink communication.

[0160] Method 2) The time domain symbols used for Type 2 SL PRS transmission are the time domain symbols that do not include PSCCH and PSSCH DMRS among the time domain symbols used for sidelink communication within the slot, excluding the first and last time domain symbols.

[0161] Method 3) The time-domain symbols used for transmitting Type II SL PRS are indicated by configuration information or pre-configuration information, which directly or indirectly indicate the index of time-domain symbols available for transmitting Type II SL PRS, and the number of time-domain symbols available for transmitting Type II SL PRS may differ depending on the priority of the different SL PRS.

[0162] Method 4) The time-domain symbol used for Type 2 SL PRS transmission is determined by the terminal's MAC layer and instructed to the terminal's physical layer, where the time-domain symbol used for Type 2 SL PRS transmission determined by the terminal's MAC layer satisfies the following requirements, namely, The first time-domain symbol used for transmitting a Type II 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 a PSCCH is located and where no PSSCH DMRS exists, and the last time-domain symbol available for sidelink communication within the slot cannot be used for transmitting a Type II SL PRS. n1 is a non-negative integer, and the value of n1 can be determined by the network configuration, pre-configuration, or the MAC layer of the terminal.

[0163] Method 5) The time-domain symbol used for transmitting a Type 2 SL PRS is a time-domain symbol that is at least n2 away from any time-domain symbol containing a PSSCH DMRS that follows time-domain symbol N, where time-domain symbol N is the first time-domain symbol that does not contain a PSSCH DMRS, following the last time-domain symbol containing a PSCCH, and n2 is an integer greater than 0, the value of which can be determined by the network configuration, pre-configuration, or the MAC layer of the terminal.

[0164] For example, in the example shown in Figure 16, symbols 1, 6, and 11 have PSSCH DMRS, and if the value of n2 is equal to 2, then symbols 4, 8, and 9 are time-domain symbols used for transmitting Type II SL PRS.

[0165] According to method 5), time-domain symbols close to those of PSSCH DMRS can be used for PSSCH transmission, thereby improving the demodulation success rate of PSSCH.

[0166] In some embodiments, the number of time-domain symbols used for transmitting Type II SL PRS within a slot is related to the number of ports in the PSSCH DMRS.

[0167] For example, when a terminal transmits from one PSSCH DMRS port, the number of time-domain symbols available for Type II SL PRS transmission can be less than the number of time-domain symbols available for Type II SL PRS transmission when there are two PSSCH DMRS ports. For example, when a terminal transmits from one PSSCH DMRS port, the number of time-domain symbols available for Type II SL PRS transmission can be zero, and when there are two PSSCH DMRS ports, the number of time-domain symbols available for Type II SL PRS transmission can be greater than zero. It should be explained that when there is one PSSCH DMRS port, the PSSCH DMRS can be used to acquire positioning-related measurements, such as signal arrival time and channel arrival angle, and resource utilization efficiency can be improved by reducing the transmission of Type II SL PRS and using more resources for PSSCH transmission.

[0168] In some embodiments, the terminal determines the comb size of the second type SL PRS and the RE offset corresponding to the first time-domain symbol in the time-domain symbol used to transmit the second type SL PRS.

[0169] In some embodiments, the terminal can determine the comb size of the Type II SL PRS and the RE offset corresponding to the first time-domain symbol in the time-domain symbol used to transmit the Type II SL PRS, based on the standard provisions (or protocol arrangements) or configuration information or pre-configured information in the resource pool.

[0170] In some embodiments, the comb size of the Type 2 SL PRS can be determined by the following method.

[0171] Method 1) The comb size of the Type 2 SL PRS is determined by the MAC layer of the terminal and instructed to the physical layer of the terminal.

[0172] Here, the comb size for Type 2 SL PRS is determined by the terminal's MAC layer from among the permitted comb sizes. For example, if the comb sizes permitted by default or within the resource pool are 1, 2, 4, and 6, the specific comb size used will be selected from among them by the terminal's MAC layer. For example, the comb size selected by the terminal's MAC layer might be 4.

[0173] Method 2) The comb size for Type 2 SL PRS is determined by the protocol agreement to be the maximum value among the permitted comb sizes that is less than or equal to the number of time-domain symbols used for Type 2 SL PRS transmission within the slot. For example, if the number of time-domain symbols used for Type 2 SL PRS transmission within the slot is 3, and the comb sizes permitted by default or within the resource pool are 1, 2, 4, and 6, then the comb size will be 2.

[0174] In some embodiments, the RE offset corresponding to the first time-domain symbol in the time-domain symbol used for transmitting a Type II SL PRS can be determined by the following method.

[0175] Method 1) The RE offset corresponding to the first time-domain symbol is determined by the terminal's MAC layer and instructed to the terminal's physical layer.

[0176] Here, the RE offset corresponding to the first time-domain symbol is selected from a first range by the terminal's MAC layer. The first range is determined based on the comb size of the second type SL PRS. For example, the first range is

number

number

[0177] Method 2) The RE offset corresponding to the first time-domain symbol is determined by the physical layer of the terminal.

[0178] Here, the RE offset corresponding to the first time-domain symbol is selected from a first range by the terminal's physical layer. The first range is determined based on the comb size of the second type SL PRS. For example, the first range is

number

number

[0179] It should be explained that the above methods for determining the comb size and the RE offset can be combined in any way, and several possible combinations are listed below as possible implementation methods.

[0180] Method 1) Comb size of Type 2 SL PRS

number

number

number

[0181] For example, comb size

number

number

number

[0182] Method 2) Comb size of Type 2 SL PRS

number

number

[0183] Method 3) Comb size of Type 2 SL PRS

number

number

number

[0184] Furthermore, after determining the RE offset corresponding to the first time-domain symbol in the time-domain symbols transmitting a Type II SL PRS, the RE offsets corresponding to the other time-domain symbols following that first time-domain symbol can be determined based on that RE offset. Let R be the number of time-domain symbols used to transmit a Type II SL PRS in one slot, and arrange these R time-domain symbols in ascending order of their time-domain symbol indices. If the corresponding order indices after arrangement are 0 ≤ d ≤ M-1, then the RE offset corresponding to the d-th time-domain symbol used to transmit a Type II SL PRS is:

number

[0185] [Table 3] When performing multiplex transmission of sidelink communication within the same slot, there is one constraint: after AGC adjustment, the receiving terminal assumes that the transmit power on all time-domain symbols within the slot is the same. For example, if only PSCCH is transmitted on symbols 1, 2, and 3 within a single slot, and PSCCH occupies a portion of the frequency-domain resources corresponding to the symbols, then if later information occupies all of the frequency-domain resources corresponding to the symbols, the transmit power on each RE of PSCCH must be increased to ensure that the transmit power on the symbols is the same. If the terminal detects that the transmit power on the RE of PSCCH is high, it will assume that the transmit power of all symbols occupied by PSCCH is high, leading to inaccurate measurement results in the resource sensing process. This will cause the terminal to exclude resources with high transmit power when selecting resources, but in reality, the transmit power of those resources should not be excluded due to measurement errors. Here, "terminal" refers to backward-compatible terminals, i.e., 3GPP Rel-17 and earlier terminals.

[0186] To ensure measurement accuracy in the resource sensing process, the transmitted power within a slot must meet several requirements.

[0187] In some embodiments, when at least PSCCH DMRS is used as the measurement reference signal in the resource sensing process in the resource pool, the transmit power in the slot is All transmitted power on time-domain symbols other than the time-domain symbol where the GP is located within the slot is P. The transmit power on the RE where the PSCCH DMRS in the slot is located is P / K. At least one of the following requirements is met: the transmit power on the time-domain symbol where PSCCH is located within the slot is P. Here, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP in the slot is located, and K is the total number of REs allocated to or included within the selected resource range for the terminal.

[0188] In some embodiments, when at least PSSCH DMRS is used as the measurement reference signal in the resource sensing process in the resource pool, the transmit power in the slot is All transmitted power on time-domain symbols other than the time-domain symbol where the GP is located within the slot is P. The transmit power on the RE where the PSSCH DMRS in the slot is located is P / K. At least one of the following requirements is met: the transmit power on the time-domain symbol where the PSSCH DMRS in the slot is located is P, Here, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP in the slot is located, and K is the total number of REs allocated to or included within the selected resource range for the terminal.

[0189] It should be explained that the transmit power on a time-domain symbol refers to the sum of the transmit power on all REs corresponding to that time-domain symbol. Here, all REs corresponding to a time-domain symbol refer to the REs that are allocated to or within the selected resource range for the terminal in that time-domain symbol.

[0190] Of all time-domain symbols used for sidelink communication within a single slot, with the exception of the last GP symbol, the transmit power on all other time-domain symbols of the terminal is P (milliwatts), where P is determined based on the power control scheme, congestion control scheme, and associated path loss measured by the terminal, which are configured within the resource pool by the terminal.

[0191] In a resource pool, if at least PSCCH DMRS is used as the measurement reference signal for SL RSRP in the resource sensing process, the terminal ensures that the transmit power on each RE where PSCCH DMRS resides is P / K, where K is the total number of REs allocated to or included in the selected resource range for the terminal. Furthermore, if no other REs on the PSCCH symbol (i.e., REs other than those occupied by PSCCH DMRS and PSCCH) are occupied, the terminal should increase the transmit power of the RE where the modulation symbol of the first stage SCI resides to ensure that the transmit power on the PSCCH symbol is P. Alternatively, the terminal can ensure that the transmit power on the PSCCH symbol is P by filling other REs on the PSCCH symbol (i.e., REs other than those occupied by PSSCH DMRS) with other content, such as PSSCH and / or the first kind of SL PRS. This allows for backward-compatible terminal resource sensing.

[0192] Similarly, in the resource pool, when at least PSSCH DMRS is used as the measurement reference signal for SL RSRP in the resource sensing process, the terminal ensures that the transmission power on each RE where PSSCH DMRS is located is P / K, where K is the total number of REs allocated to or selected by the terminal within the resource range. Further, the terminal can ensure that the transmission power on the PSSCH symbol is P by transmitting PSSCH on other REs (i.e., REs other than those occupied by PSSCH DMRS) on the PSSCH symbol, thereby fully occupying the other REs. This enables compatibility with the resource sensing of backward-compatible terminals.

[0193] It should be noted that the backward-compatible terminals described in the embodiments of this application can refer to 3GPP Rel-17 and earlier terminals.

[0194] Continuing from the foregoing, in some embodiments, in the resource pool, when at least PSCCH DMRS is used as the measurement reference signal in the resource sensing process, the time-domain symbol where PSCCH is located includes PSSCH and / or the first type of SL PRS. Here, the REs occupied by PSSCH and / or the first type of SL PRS are REs other than the second part of REs within the first part of REs. The first part of REs refers to the REs corresponding to the time-domain symbol where PSCCH is located within the resource range allocated to or selected by the terminal, and the second part of REs refers to the REs already occupied by PSCCH DMRS and PSCCH on the time-domain symbol where PSCCH is located. This enables all REs within the resource range allocated to or selected by the terminal on the time-domain symbol where PSCCH is located to be fully occupied.

[0195] Here, the PSSCH can be used to carry the second-stage SCI and / or the SL-SCH. In some embodiments, when the PSSCH is used to carry only the second-stage SCI, the PSSCH and the first type of SL PRS are included in the time-domain symbol where the PSCCH is located. In some embodiments, when the PSSCH is used to carry the second-stage SCI and the SL-SCH, the PSSCH is included in the time-domain symbol where the PSCCH is located.

[0196] By the above solution means, the terminal can ensure that the transmission power on the time-domain symbol where the PSCCH is located is the same as the transmission power on other time-domain symbols without increasing the PSCCH DMRS and the transmission power of the PSCCH, thereby avoiding the influence on the resource sensing of backward-compatible terminals.

[0197] As one implementation plan, to simplify the system design, on the time-domain symbol where the PSCCH is located, the terminal transmits the PSSCH and / or the first type of SL PRS, thereby occupying all the REs within the resource range allocated or selected for the terminal on the time-domain symbol where the PSCCH is located.

[0198] As another implementation plan, in the resource pool, when the PSCCH DMRS is used as the measurement reference signal for the SL RSRP in the resource sensing process, on the time-domain symbol where the PSCCH is located, the terminal transmits the PSSCH and / or the first type of SL PRS, thereby occupying all the REs within the resource range allocated or selected for the terminal on the time-domain symbol where the PSCCH is located. On the other hand, in the resource pool, when the PSSCH DMRS is used as the measurement reference signal for the SL RSRP in the resource sensing process, on the time-domain symbol where the PSCCH is located, the terminal can only occupy some of the REs within the allocated or selected resource range on the time-domain symbol.

[0199] In some embodiments, the inclusion of a PSSCH in the time-domain symbol where a PSCCH resides may be understood as a terminal transmitting a PSSCH on the time-domain symbol where the PSCCH resides, the purpose of which is to fully occupy the RE on the time-domain symbol where the PSCCH resides, which can be achieved by the following means.

[0200] The terminal performs rate matching and / or iterative mapping to the PSCCH until the PSCCH occupies all REs within the first part RE except for the second part RE. The first part RE refers to the RE corresponding to the time domain symbol where the PSCCH is located, within the resource range allocated to or selected by the terminal, and the second part RE refers to the RE already occupied by the PSCCH DMRS and the PSCCH on the time domain symbol where the PSCCH is located.

[0201] In this case, the PSSCH, which is used to transport only the second stage SCI, is better suited to occupying the RE using a repeating mapping method.

[0202] Here, the PSSCH used to transport the second stage SCI and SL-SCH is better suited to occupying the RE using a rate matching method, but of course, it can also occupy the RE using a repeating mapping method.

[0203] As an example, when a terminal performs rate matching on a PSCCH, it is ensured that the PSCCH can occupy all REs within the resource range allocated to or selected by the terminal on the time-domain symbol to which it is mapped. Here, if at least the PSCCH DMRS is used as the measurement reference signal for the SL RSRP in the resource sensing process in the resource pool, the time-domain symbol to which it is mapped includes at least the time-domain symbol on which the PSCCH is located.

[0204] As an example, the terminal repeatedly maps to the PSCCH until it occupies all REs within the resource range allocated to or selected by the terminal on the time-domain symbol being mapped. Here, if at least the PSCCH DMRS is used as the measurement reference signal for the SL RSRP in the resource sensing process in the resource pool, the OFDM symbol being mapped includes at least the time-domain symbol where the PSCCH is located.

[0205] Following the preamble, in some embodiments, when at least PSSCH DMRS is used as the measurement reference signal in the resource sensing process in the resource pool, the time-domain symbol on which PSSCH DMRS is located includes PSSCH. Here, the REs occupied by PSSCH are REs other than the fourth part REs within the third part RE. The third part RE refers to the REs within the resource range allocated to or selected by the terminal that correspond to the time-domain symbol on which PSSCH DMRS is located, and the fourth part RE refers to the REs already occupied by PSSCH DMRS on the time-domain symbol on which PSSCH DMRS is located. This ensures that all REs within the resource range allocated to or selected by the terminal on the time-domain symbol on which PSSCH DMRS is located are fully occupied.

[0206] Here, the PSSCH can be used to transport the second stage SCI and / or SL-SCH.

[0207] The above solution ensures that the terminal 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, without needing to increase the transmit power of the PSSCH DMRS, thereby avoiding any impact on resource sensing of backward-compatible terminals.

[0208] One possible implementation is to simplify the system design by having the terminal transmit a PSSCH on the time domain symbol where the PSSCH DMRS is located, thereby filling all REs allocated to or selected by the terminal on the time domain symbol where the PSSCH DMRS is located.

[0209] Alternatively, in a resource pool, if PSSCH DMRS is used as the measurement reference signal for SL RSRP in the resource sensing process, the terminal transmits PSSCH on the time-domain symbol where PSSCH DMRS is located, thereby filling all REs within the resource range allocated to or selected by the terminal on that time-domain symbol. On the other hand, in a resource pool, if PSCCH DMRS is used as the measurement reference signal for SL RSRP in the resource sensing process, the terminal can occupy only a portion of the REs within the resource range allocated to or selected on the time-domain symbol where PSSCH DMRS is located.

[0210] In some embodiments, the inclusion of PSSCH in the time-domain symbol where PSSCH DMRS resides can be understood as a terminal transmitting PSSCH on the time-domain symbol where PSSCH DMRS resides, the purpose of which is to fill the RE on the time-domain symbol where PSSCH DMRS resides, which can be achieved in the following manner.

[0211] The terminal performs rate matching and / or iterative mapping to the PSSCH until the PSSCH occupies all REs within the third part RE except for the fourth part RE. The third part RE refers to the RE corresponding to the time domain symbol where the PSSCH DMRS is located, within the resource range allocated to or selected by the terminal, and the fourth part RE refers to the RE already occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located.

[0212] In this case, the PSSCH, which is used to transport only the second stage SCI, is better suited to occupying the RE using a repeating mapping method.

[0213] Here, for the PSSCH used to transport the second stage SCI and SL-SCH, it is more suitable to occupy the RE using the rate matching method, but of course, it is also possible to occupy the RE using the iterative mapping method.

[0214] In the above solution, the first type SL PRS is advantageous in ensuring that the transmit power on each RE is the same in the time-domain symbol where the PSCCH is located, thereby reducing the impact on resource sensing of backward-compatible terminals.

[0215] In some embodiments, when a terminal transmits a PSSCH and an SL-SCH within the same slot (i.e., when an SL-PRS and a PSSCH are multiplexed within the same slot), the PSSCH may include at least a second-stage SCI and optionally include an SL-SCH. When the PSSCH includes an SL-SCH, the terminal can determine the size of the transport block (TBS) carried by the PSSCH based on the time-domain symbols available for the PSSCH transmission and the available REs on each time-domain symbol.

[0216] In some embodiments, the terminal determines the TBS to be carried by the PSSCH. The TBS is related to a first parameter, which in turn is related to a second parameter. The first parameter represents the number of reference REs available to the PSSCH in the PRB occupied by the PSSCH, and the second parameter represents the number of reference REs available to the PSSCH in a single PRB.

[0217] When the time-domain symbols occupied by PSSCH and SL PRS are different, the second parameter is related to the third parameter, and the third parameter represents the number of symbols occupied by SL PRS and / or the number of symbols used to support the transmission of PSFCH.

[0218] When the time-domain symbols occupied by PSSCH and SL PRS are at least partially the same, the second parameter is related to the fourth parameter, and the fourth parameter represents the number of REs occupied by SL PRS.

[0219] As an example, the first parameter can be expressed as

Number

Number

Number

Number

[0220] In some embodiments, the third parameter can be determined by the following method.

[0221] When 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 within one slot.

[0222] If a PSFCH resource is configured within the resource pool, the value of the third parameter is Mf. Here, M represents the number of time-domain symbols used for Type II SL PRS transmission in the slot, and f represents the number of the last F time-domain symbols available for sidelink communication in the slot out of the M time-domain symbols, where 0 ≤ f ≤ F-1, and F is an integer greater than or equal to 1. For example, F = 4.

[0223] In some embodiments, the fourth parameter can be determined by the following method.

[0224] The fourth parameter is

number

number

number

[0225] For example, TBS transported by PSSCH is N RE It is determined based on (i.e., the first parameter). N RE This represents the number of reference REs available to the PSSCH within the PRB occupied by the PSSCH. RE This can be determined by the following formula.

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

number

[0226] In some embodiments, if the time-domain symbols occupied by the PSSCH and SL PRS are different during the retransmission process of the same TB, the terminal determines that the number of time-domain symbols occupied by the SL PRS transmitted with the TB remains constant. If the time-domain symbols occupied by the PSSCH and SL PRS are at least partially the same, the terminal determines that the number of time-domain symbols occupied by the SL PRS transmitted with the TB and the comb size remain constant.

[0227] Here, in 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 transmitted with the TB remains unchanged. If the PSSCH and SL PRS 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 transmitted with the TB and the comb size remain unchanged, thereby ensuring that the TBS determined by the receiving terminal and the transmitting terminal match.

[0228] The technical solution of the embodiment of this application clarifies the multiplexing scheme within the same slot for the SL PRS and the physical channel when the SL PRS and the physical channel share a resource pool, thereby ensuring effective multiplexing within the same slot and guaranteeing backward compatibility and resource utilization.

[0229] While preferred embodiments of this application have been described in detail above in conjunction with the drawings, this application is not limited to the specific details of the embodiments described above. Within the scope of the technical idea of ​​this application, various simple modifications can be made to the technical solutions of this application, and any of these simple modifications fall within the scope of protection of this application. For example, each specific technical feature described in the specific embodiments described above can be combined in any way, as long as they do not contradict each other. To avoid unnecessary redundancy, this application does not further describe the various possible combinations. Furthermore, for example, different embodiments of this application can be combined in any way, and as long as they do not contradict the idea of ​​this application, they should be considered to be disclosed in the same way. Furthermore, for example, provided that they do not contradict each other, each embodiment and / or the technical features in each embodiment described in this application can be combined with existing technology in any way, and the technical solutions obtained by such combinations should also be included within the scope of protection of this application.

[0230] Furthermore, in the embodiments of the various methods of this application, the magnitude of the number of each process described above does not indicate the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation processes of the embodiments of this application. In addition, in the embodiments of this application, the terms “downlink,” “uplink,” and “sidelink” are used to indicate the direction of signal or data transmission, where “downlink” indicates that the direction of signal or data transmission is a first direction from the station to the user equipment in the cell, “uplink” indicates that the direction of signal or data transmission is a second direction from the user equipment in the cell to the station, and “sidelink” indicates that the direction of signal or data transmission is a third direction from user equipment 1 to user equipment 2. For example, “downlink signal” indicates that the direction of transmission of that signal is the first direction. Also, in the embodiments of this application, the term “and / or” describes the relationship between related objects, and indicates that three relationships may exist. Specifically, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, in this specification, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0231] Figure 17 is a schematic diagram of the configuration of a side link transmission device provided in an embodiment of this application, and as shown in Figure 17, it is applied to a terminal. As shown in Figure 17, the side link transmission device is The system includes a communication unit 1701 configured to transmit or receive an SL PRS, which is generated by an SL PRS sequence, which is generated based on the lower L bit of the CRC of a PSCCH or based on an ID determined by the upper layer of the transmitting terminal, where L is a non-negative integer.

[0232] In some embodiments, when the SL PRS needs to be used to measure the SL RSRP in the resource sensing process, the SL PRS sequence is generated based on the lower L bit of the CRC of the PSCCH, for example, L=12, but not limited to this, and L can take other values. In other cases (i.e., when the SL PRS does not need to be used to measure the SL RSRP in the resource sensing process), the SL PRS sequence is generated based on an ID determined by the upper layer of the transmitting terminal.

[0233] Those skilled in the art should understand that the description of the sidelink transmission device in the embodiments of this application can be understood by referring to the description of the sidelink transmission method in the embodiments of this application.

[0234] Figure 18 is a schematic diagram of the configuration of a side link transmission device provided in an embodiment of this application, and as shown in Figure 18, it is applied to a terminal. As shown in Figure 18, the side link transmission device is The system includes a communication unit 1801 configured to transmit or receive a physical channel with an SL PRS, the physical channel including a PSCCH and / or PSSCH, where the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed within the same slot.

[0235] In some embodiments, the SL PRS includes a first-class SL PRS and / or a second-class SL PRS.

[0236] A Type 1 SL PRS refers to an SL PRS transmitted on a Type 1 time-domain symbol, and a Type 1 time-domain symbol refers to the time-domain symbol in the slot where the PSCCH is located.

[0237] A Type II SL PRS refers to an SL PRS transmitted over a Type II time-domain symbol, and a Type II time-domain symbol refers to a time-domain symbol in a slot that does not include PSCCH and / or PSSCH DMRS.

[0238] PSSCH DMRS is a DMRS that corresponds to PSSCH.

[0239] In some embodiments, the comb size of the first type SL PRS is smaller than the comb size of the second type SL PRS.

[0240] In some embodiments, when the PSSCH is used to transport only the second stage SCI, the SL PRS includes both a first-class SL PRS and a second-class SL PRS. Alternatively, when the PSSCH is used to transport both the second stage SCI and the SL-SCH, the SL PRS includes only a second-class SL PRS.

[0241] In some embodiments, when at least PSCCH DMRS is used as the measurement reference signal in the resource sensing process within the resource pool, the time-domain symbol where PSCCH is located includes PSSCH and / or a first kind SL PRS. PSCCH DMRS is the DMRS corresponding to PSCCH.

[0242] In some embodiments, when PSSCH is used to transport only the second-stage SCI, the time-domain symbol where PSCCH is located includes PSSCH and the first kind of SL-PRS. Alternatively, when PSSCH is used to transport both the second-stage SCI and SL-SCH, the time-domain symbol where PSCCH is located includes PSSCH.

[0243] In some embodiments, the REs occupied by the PSCCH and / or the first type SL PRS are REs other than the second part REs within the first part RE. The first part RE refers to an RE corresponding to the time domain symbol where the PSCCH is located, within the resource range allocated to or selected for the terminal, and the second part RE refers to an RE already occupied by the PSCCH DMRS and the PSCCH on the time domain symbol where the PSCCH is located.

[0244] In some embodiments, if the time domain symbol in which the PSCCH resides includes a PSSCH, the device further includes a processing unit 1802 configured to perform rate matching and / or iterative mapping to the PSSCH until the PSSCH occupies an RE other than the second part RE within the first part RE, where the first part RE refers to an RE corresponding to the time domain symbol in which the PSCCH resides, within a resource range allocated to or selected by the terminal, and the second part RE refers to an RE already occupied by the PSCCH DMRS and the PSCCH on the time domain symbol in which the PSCCH resides.

[0245] In some embodiments, when at least PSSCH DMRS is used as the measurement reference signal in the resource sensing process within a resource pool, the time-domain symbol on which PSSCH DMRS is located includes PSSCH.

[0246] In some embodiments, the RE occupied by PSSCH is an RE other than the fourth part RE within the third part RE. The third part RE refers to an RE corresponding to the time domain symbol where the PSSCH DMRS is located, within the resource range allocated to or selected for the terminal, and the fourth part RE refers to an RE already occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located.

[0247] In some embodiments, the apparatus further includes a processing unit 1802 configured to perform rate matching and / or iterative mapping to the PSSCH until the PSSCH occupies an RE other than the fourth part RE within the third part RE, where the third part RE refers to an RE corresponding to the time domain symbol where the PSSCH DMRS is located, within a resource range allocated to or selected by the terminal, and the fourth part RE refers to an RE already occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located.

[0248] In some embodiments, the time-domain symbols used for transmitting a Type II SL PRS are determined by at least one of the following methods: network configuration, pre-configuration, or terminal implementation.

[0249] In some embodiments, the implementation of the terminal refers to the MAC layer of the terminal determining the time-domain symbols used for transmitting a Type II SL PRS and instructing the physical layer of the terminal to use them. In some embodiments, the time-domain symbols used for transmitting a Type II SL PRS satisfy one or more of the following requirements:

[0250] The time-domain symbols used for Type 2 SL PRS transmission are the time-domain symbols used for sidelink communication within the slot, excluding the first and / or last time-domain symbols.

[0251] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that do not include PSCCH.

[0252] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that do not include PSSCH DMRS.

[0253] The time-domain symbols used for Type 2 SL PRS transmission are time-domain symbols that are not occupied by the second-stage SCI.

[0254] The first time-domain symbol in the time-domain symbols used for transmitting a Type 2 SL PRS is time-domain symbol N+n1. Time-domain symbol N is the first time-domain symbol after the last time-domain symbol in which the PSCCH is located, and where no PSSCH DMRS exists, and n1 is a non-negative integer.

[0255] The time-domain symbol used for transmitting a Type 2 SL PRS is a time-domain symbol that is at least n2 away from any time-domain symbol containing a PSSCH DMRS that follows time-domain symbol N. Time-domain symbol N is the first time-domain symbol that does not contain a PSSCH DMRS, following the last time-domain symbol containing the PSCCH, where n2 is an integer greater than 0.

[0256] In some embodiments, the number of time-domain symbols used for transmitting a Type II SL PRS is related to the number of ports in the PSSCH DMRS.

[0257] In some embodiments, the processing unit 1802 is further configured to determine the comb size of the second type SL PRS and the RE offset corresponding to the first time-domain symbol in the time-domain symbol used for transmitting the second type SL PRS.

[0258] In some embodiments, the comb size of the Type II SL PRS is determined by the MAC layer of the terminal and instructed to the physical layer of the terminal. Alternatively, the comb size of the Type II SL PRS is defined by the protocol as the maximum of the permitted comb sizes that is less than or equal to the number of time-domain symbols used for transmitting the Type II SL PRS within the slot. In some embodiments, the comb size of the Type II SL PRS is determined by the MAC layer of the terminal from among the permitted comb sizes.

[0259] In some embodiments, the RE offset corresponding to the first time-domain symbol is determined by the MAC layer of the terminal and directed 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.

[0260] In some embodiments, the RE offset corresponding to the first time-domain symbol is selected from a first range by the MAC layer or physical layer of the terminal, and the first range is determined based on the comb size of the second type SL PRS.

[0261] In some embodiments, the first range is

number

number

number

number

number

[0262] In some embodiments, if no PSFCH resources are configured in the resource pool, the value of M' is M, and 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 transmitting Type II SL PRS in the slot, and f represents the number of the last F time-domain symbols available for sidelink communication in the slot out of the M time-domain symbols, where 0 ≤ f ≤ F-1, and F is an integer greater than or equal to 1.

[0263] In some embodiments, the processing unit 1802 is further configured to determine that, in the retransmission process of the same TB, if the time-domain symbols occupied by the PSSCH and SL PRS are different, the number of time-domain symbols occupied by the SL PRS transmitted with the TB remains constant, and if the time-domain symbols occupied by the PSSCH and SL PRS are at least partially the same, the number of time-domain symbols occupied by the SL PRS transmitted with the TB and the comb size remain constant.

[0264] In some embodiments, when at least PSCCH DMRS is used as the measurement reference signal in the resource sensing process within the resource pool, the transmit power in the slot satisfies at least one of the following requirements:

[0265] All transmitted power on time-domain symbols other than the time-domain symbol where the GP is located within the slot is P.

[0266] The transmit power on the RE where the PSCCH DMRS is located within the slot is P / K.

[0267] The transmit power on the time-domain symbol where PSCCH is located within the slot is P.

[0268] Here, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP in the slot is located, and K is the total number of REs allocated to the terminal or included within the selected resource range.

[0269] In some embodiments, when at least PSSCH DMRS is used as the measurement reference signal in the resource sensing process within a resource pool, the transmit power in the slot satisfies at least one of the following requirements:

[0270] All transmitted power on time-domain symbols other than the time-domain symbol where the GP is located within the slot is P.

[0271] The transmit power on the RE where the PSSCH DMRS in the slot is located is P / K.

[0272] The transmit power on the time-domain symbol where the PSSCH DMRS is located in the slot is P.

[0273] Here, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP in the slot is located, and K is the total number of REs allocated to or included within the selected resource range for the terminal.

[0274] Those skilled in the art should understand that the description of the sidelink transmission device in the embodiments of this application can be understood by referring to the description of the sidelink transmission method in the embodiments of this application.

[0275] Figure 19 is a schematic 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 execute a computer program from memory to implement the method in the embodiment of the present application.

[0276] Optionally, as shown in Figure 19, the communication device 1900 may further include a memory 1920. Here, the processor 1910 can call and execute a computer program from the memory 1920 to realize the method in the embodiment of this application.

[0277] Here, the memory 1920 may be a standalone device independent of the processor 1910, or it may be integrated into the processor 1910.

[0278] Optionally, as shown in Figure 19, the communication device 1900 may further include a transceiver 1930. The processor 1910 can control the transceiver 1930 to communicate with other devices, specifically by sending information and data to other devices or receiving information and data sent by other devices.

[0279] Here, 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.

[0280] The communication device 1900 may specifically be a terminal of the embodiment of this application, and the communication device 1900 can implement the corresponding process implemented by the terminal in each method of the embodiment of this application. For brevity, the explanation is omitted here.

[0281] Figure 20 is a schematic diagram of the chip of an embodiment of this application. The chip 2000 shown in Figure 20 includes a processor 2010, which can call and execute a computer program from memory and realize the method of the embodiment of this application.

[0282] Optionally, as shown in Figure 20, the chip 2000 may further include memory 2020. Here, the processor 2010 can call and execute a computer program from memory 2020 to realize the method in the embodiment of this application.

[0283] Here, memory 2020 may be a standalone device independent of processor 2010, or it may be integrated into processor 2010.

[0284] Optionally, the chip 2000 may further include an input interface 2030. Here, the processor 2010 can control the input interface 2030 to communicate with other devices or chips, specifically, to acquire information or data transmitted by other devices or chips.

[0285] Optionally, the chip 2000 may further include an output interface 2040. Here, the processor 2010 can control the output interface 2040 to communicate with other devices or chips, specifically, it can output information or data to other devices or chips.

[0286] The chip can be applied to the terminal in the embodiment of this application, and the chip can implement the corresponding process realized by the terminal in each method of the embodiment of this application. For brevity, the explanation is omitted here.

[0287] Please understand that the chips referred to in the embodiments of this application may also be called system-level chips, system chips, chip systems, or on-chip system chips.

[0288] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip having signal processing capabilities. In the implementation process, each step of the embodiments of the above method can be completed by hardware integrated logic circuits or software-form instructions within the processor. The above processor may 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 device, discrete gate or transistor logic device, or discrete hardware component. Each method, step, and logic block diagram disclosed in the embodiments of this application can be implemented or executed. The general-purpose processor may be a microprocessor, and the processor may be any conventional processor, etc. In conjunction with the steps of the methods disclosed in the embodiments of this application, execution by a hardware decode processor is directly implemented, or execution is completed by a combination of hardware and software modules within the decode processor. The software module can be placed in a storage medium that is mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, or registers. The storage medium is placed in memory, and the processor reads the information in memory and combines it with its hardware to complete the steps of the method described above.

[0289] It should be understood that the memory in the embodiments of this application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Here, non-volatile memory may be read-only memory (ROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) and function as an external cache. For illustrative but non-limiting purposes, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is not limited to these but is intended to include any other suitable type of memory.

[0290] The above descriptions of memory are illustrative but not limiting. For example, the memory in the embodiments of this application may include static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synch-link dynamic random access memory (synch-link DRAM, SLDRAM), and direct memory bus random access memory (Direct Rambus RAM, DR RAM). In other words, the memory in the embodiments of this application is not limited to these and is intended to include any other suitable type of memory.

[0291] Embodiments of this application also provide a computer-readable storage medium for storing computer programs. The computer-readable storage medium can be applied to a terminal in an embodiment of this application, and the computer program causes the computer to execute the corresponding process implemented by the terminal in each method of the embodiment of this application. For brevity, further explanation is omitted here.

[0292] Furthermore, embodiments of this application provide a computer program product including computer program instructions. This computer program product can be applied to the terminal in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the terminal in each method of the embodiments of this application. For brevity, further explanation is omitted here.

[0293] Embodiments of this application also provide a computer program. This computer program can be applied to the terminal in the embodiment of this application, and 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 embodiment of this application. For brevity, further explanation is omitted here. Those skilled in the art will recognize that the units and algorithmic steps of each example described in conjunction with the embodiments disclosed herein can be implemented by 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. While experts in the art may implement the described functions using different methods for each specific application, such implementations should not be considered beyond the scope of this application.

[0294] Those skilled in the art will clearly understand that, for the convenience and brevity of explanation, the specific operating processes of the systems, apparatus, and units described above can be referenced to the corresponding processes in the embodiments of the aforementioned methods, and that the explanation is omitted here.

[0295] In some embodiments provided in this application, it should be understood that the disclosed systems, apparatus, and methods can be implemented in other ways. For example, the embodiments of the apparatus described above are merely schematic, and the division of the units is merely a logical functional division; other methods of division may exist in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not performed. Another point is that the coupling, direct coupling, or communication connection between the shown or discussed may be via some interface, and the joint coupling or communication connection of the apparatus or units may be electrical, mechanical, or otherwise.

[0296] Units described as separate components may or may not be physically separate, and components displayed as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Depending on the actual needs, some or all of these units can be selected to achieve the objectives of the solution of this embodiment.

[0297] Furthermore, each functional unit in each embodiment of this application may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0298] If the function is implemented in the form of a software function unit and sold or used as an independent product, it can be stored on a computer-readable storage medium. Based on this understanding, an essential part of the technical solution of this application, or a part of the part that contributes to existing technology, or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored on a storage medium and contains several instructions for causing a computer device (such as a personal computer, server, or network device) to perform all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB memory, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0299] The above are merely specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any modification or substitution that can be easily conceived by an expert in the art within the scope of the art disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A side link transmission method, The terminal includes transmitting or receiving a side-link positioning reference signal (SL PRS) and a physical channel. The physical channel includes a physical sidelink control channel (PSCCH) and / or a physical sidelink sharing channel (PSSCH). The SL PRS and the physical channel share a resource pool and are multiplexed within the same slot. Sidelink transmission method.

2. The aforementioned SL PRS includes a first-class SL PRS and / or a second-class SL PRS. The aforementioned Type 1 SL PRS is an SL PRS transmitted on a Type 1 time-domain symbol, and the aforementioned Type 1 time-domain symbol is the time-domain symbol in the slot where the PSCCH is located. The aforementioned Type 2 SL PRS is an SL PRS transmitted on a Type 2 time-domain symbol, and the aforementioned Type 2 time-domain symbol is a time-domain symbol in the slot that does not include PSCCH and / or PSSCH DMRS. The PSSCH DMRS is a demodulated reference signal (DMRS) corresponding to the PSSCH. The side link transmission method according to claim 1.

3. The comb size of the aforementioned Type 1 SL PRS is smaller than the comb size of the aforementioned Type 2 SL PRS. The side link transmission method according to claim 2.

4. When the PSSCH is used to transport only the second stage SCI, the SL PRS includes the first type SL PRS and the second type SL PRS, or When the PSSCH is used to transport the second stage SCI and SL-SCH, the SL PRS includes only the second type SL PRS. The side link transmission method according to claim 2 or 3.

5. Within the resource pool, if at least PSCCH DMRS is used as the measurement reference signal in the resource sensing process, The time-domain symbol in which the PSCCH is located includes the PSCCH and / or the first type SL PRS, The PSCCH DMRS is a DMRS corresponding to the PSCCH. The side link transmission method according to any one of claims 2 to 4.

6. When the PSSCH is used to transport only the second stage SCI, the time-domain symbol in which the PSSCH is located includes the PSSCH and the first type SL PRS, or When the PSSCH is used to transport the second stage SCI and SL-SCH, the time-domain symbol in which the PSSCH is located includes the PSSCH. The side link transmission method according to claim 5.

7. The REs occupied by the PSCCH and / or the first type SL PRS are REs within the first part RE other than the second part RE, the first part RE is an RE within the resource range allocated to or selected for the terminal that corresponds to the time domain symbol where the PSCCH is located, and the second part RE is an RE already occupied by the PSCCH DMRS and the PSCCH on the time domain symbol where the PSCCH is located. The side link transmission method according to claim 5 or 6.

8. If the time-domain symbol in which the PSCCH is located includes the PSSCH, the side-link transmission method further: The terminal includes performing rate matching and / or iterative mapping to the PSCCH until the PSCCH occupies an RE other than the second part RE within the first part RE, wherein the first part RE is an RE corresponding to the time domain symbol where the PSCCH is located, within the resource range allocated to or selected by the terminal, and the second part RE is an RE already occupied by the PSCCH DMRS and the PSCCH on the time domain symbol where the PSCCH is located. The side link transmission method according to any one of claims 5 to 7.

9. Within the resource pool, if at least the PSSCH DMRS is used as the measurement reference signal in the resource sensing process, The time-domain symbol in which the PSSCH DMRS is located includes the PSSCH, The side link transmission method according to any one of claims 2 to 4.

10. The RE occupied by the PSSCH is an RE other than the fourth part RE within the third part RE, the third part RE is an RE corresponding to the time domain symbol where the PSSCH DMRS is located, within the resource range allocated to or selected for the terminal, and the fourth part RE is an RE already occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located. The side link transmission method according to claim 9.

11. The aforementioned side link transmission method further, The terminal includes performing rate matching and / or iterative mapping to the PSSCH until the PSSCH occupies an RE other than the fourth portion RE within the third portion RE, wherein the third portion RE is an RE corresponding to the time domain symbol where the PSSCH DMRS is located, within the resource range allocated to or selected by the terminal, and the fourth portion RE is an RE already occupied by the PSSCH DMRS on the time domain symbol where the PSSCH DMRS is located. The side link transmission method according to claim 9 or 10.

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

13. The implementation of the terminal involves the MAC layer of the terminal determining the time-domain symbol used for transmitting the second type SL PRS and instructing the physical layer of the terminal to use the time-domain symbol. The side link transmission method according to claim 12.

14. The time-domain symbols used for transmitting the aforementioned Type 2 SL PRS are: The time domain symbols used for transmitting the Type 2 SL PRS are the time domain symbols used for sidelink communication within the slot, excluding the first time domain symbol and / or the last time domain symbol. The time-domain symbols used for transmitting the aforementioned Type 2 SL PRS are time-domain symbols that do not include PSCCH. The time-domain symbols used for transmitting the aforementioned Type 2 SL PRS are time-domain symbols that do not include PSSCH DMRS. The time-domain symbols used for transmitting the aforementioned Type 2 SL PRS are time-domain symbols that are not occupied by the second-stage SCI. The first time-domain symbol in the time-domain symbols used for transmitting the second type 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 PSSCH DMRS does not exist, and n1 is a non-negative integer. The time-domain symbol used for transmitting the second type SL PRS is a time-domain symbol whose distance from any time-domain symbol containing a PSSCH DMRS after time-domain symbol N is n2 or greater, and time-domain symbol N is the first time-domain symbol after the last time-domain symbol containing the PSCCH where no PSSCH DMRS exists, and n2 is an integer greater than 0. Satisfying one or more of the following requirements: The side link transmission method according to any one of claims 2 to 13.

15. The number of time-domain symbols used for transmission of the aforementioned Type 2 SL PRS is related to the number of ports of the PSSCH DMRS. The side link transmission method according to any one of claims 2 to 14.

16. The aforementioned side link transmission method further, The terminal includes determining the comb size of the second type SL PRS and the RE offset corresponding to the first time-domain symbol in the time-domain symbol used for transmitting the second type SL PRS. The side link transmission method according to any one of claims 2 to 15.

17. The comb size of the aforementioned Type 2 SL PRS is determined by the Media Access Control (MAC) layer of the terminal and instructed to the physical layer of the terminal, or The comb size of the Type II SL PRS is defined by the protocol as the maximum value among the permitted comb sizes that is less than or equal to the number of time-domain symbols used for transmitting the Type II SL PRS within the slot. The side link transmission method according to claim 16.

18. The comb size of the aforementioned Type 2 SL PRS is determined by the MAC layer of the terminal from among the permitted comb sizes. The side link transmission method according to claim 17.

19. The RE offset corresponding to the first time-domain symbol is determined by the MAC layer of the terminal and instructed 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. The side link transmission method according to any one of claims 16 to 18.

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

21. The first range is [Math 1] And, [Math 2] This represents the comb size of the aforementioned Type 2 SL PRS. The side link transmission method according to claim 20.

22. When the SL PRS and the PSSCH are multiplexed within the same slot, the sidelink transmission method further: The terminal includes determining the size (TBS) of the transport block to be transported by the PSSCH, wherein the TBS is related to a first parameter, the first parameter is related to a second parameter, the first parameter represents the number of reference REs available to the PSSCH in the PRB occupied by the PSSCH, and the second parameter represents the number of reference REs available to the PSSCH in one PRB. If the time-domain symbols occupied by the PSFCH and the SL PRS are different, the second parameter relates to the third parameter, which represents the number of symbols occupied by the SL PRS and / or the number of symbols used to support the transmission of the PSFCH. If the time-domain symbols occupied by the PSSCH and the SL PRS are at least partially the same, the second parameter relates to the fourth parameter, the fourth parameter representing the number of REs occupied by the SL PRS. The side link transmission method according to any one of claims 2 to 21.

23. If no PSFCH resources are configured within the resource pool, the third parameter represents the number of time-domain symbols used for the second type SL PRS in one slot. When a PSFCH resource is configured within the resource pool, the value of the third parameter is M - f, where M represents the number of time-domain symbols used for transmitting the second type SL PRS in the slot, and f represents the number of the last F time-domain symbols available for sidelink communication in the slot out of the M time-domain symbols, where 0 ≤ f ≤ F - 1, and F is an integer greater than or equal to 1. The side link transmission method according to claim 22.

24. The fourth parameter is [Math 3] And M' is the fifth parameter, [Math 4] This represents the number of subcarriers within a single PRB. [Math 5] This represents the comb size of the SL PRS mentioned above. The side link transmission method according to claim 22.

25. If no PSFCH resources are configured within the resource pool, the value of M' is M. If a PSFCH resource is configured within the resource pool, the value of M' is M - f. M represents the number of time-domain symbols used for transmitting the second type SL PRS within the slot, and f represents the number of the last F time-domain symbols available for sidelink communication within the slot out of the M time-domain symbols, where 0 ≤ f ≤ F - 1, and F is an integer greater than or equal to 1. The side link transmission method according to claim 24.

26. The aforementioned side link transmission method further, In 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 transmitted with the TB remains unchanged, and 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 transmitted with the TB and the comb size remain unchanged. The side link transmission method according to any one of claims 22 to 25.

27. Within the resource pool, if at least the PSCCH DMRS is used as the measurement reference signal in the resource sensing process, the transmit power in the slot is: The transmitted power on time-domain symbols other than the time-domain symbol where the GP is located in the aforementioned slot is all P. The transmit power on the RE where the PSCCH DMRS in the aforementioned slot is located is P / K. The transmit power on the time-domain symbol where the PSCCH is located in the slot is P. Satisfying at least one of the following requirements, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP is located in the slot, and K is the total number of REs allocated to or included within the selected resource range of the terminal. The side link transmission method according to any one of claims 1 to 8 or 12 to 26.

28. Within the resource pool, if at least the PSSCH DMRS is used as the measurement reference signal in the resource sensing process, the transmit power in the slot is: The transmitted power on time-domain symbols other than the time-domain symbol where the GP is located in the aforementioned slot is all P. The transmit power on the RE where the PSSCH DMRS in the aforementioned slot is located is P / K. The transmit power on the time-domain symbol where the PSSCH DMRS is located in the slot is P. Satisfying at least one of the following requirements, P is the transmit power on time-domain symbols other than the time-domain symbol where the GP is located in the slot, and K is the total number of REs allocated to or included within the selected resource range of the terminal. A sidelink transmission method according to any one of claims 1 to 4 or 9 to 26.

29. Side link transmission device, The system comprises a communication unit configured to transmit or receive an SL PRS and a physical channel, the physical channel including a PSCCH and / or PSSCH, the SL PRS and the physical channel share a resource pool, and the SL PRS and the physical channel are multiplexed within the same slot. Side link transmission device.

30. It is a terminal, Equipped with a processor and memory, This memory is used to store computer programs. The processor calls and executes a computer program stored in the memory and performs the side-link transmission method according to any one of claims 1 to 28. Terminal.

31. It's a tip, Equipped with a processor, The processor calls and executes a computer program from memory, causing the device on which the chip is mounted to execute the sidelink transmission method described in any one of claims 1 to 28. Tip.

32. The computer program stores a computer program that causes the computer to execute the sidelink transmission method described in any one of claims 1 to 28. Computer-readable storage medium.

33. Includes a computer program instruction that causes a computer to execute the sidelink transmission method described in any one of claims 1 to 28, Computer program products.

34. When executed on a computer, the computer is made to execute the sidelink transmission method described in any one of claims 1 to 28. Computer program.

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