Resource mapping method and device, terminal, chip and storage medium

Abstract

The embodiment of the invention provides a resource mapping method, and the method comprises the steps: mapping second-order side control information SCI in a physical side shared channel PSSCH from a first resource unit in a time slot to at least one second resource unit which comprises the first resource unit; a demodulation reference signal of the PSSCH exists on a symbol where the first resource unit is located; the at least one second resource unit is not overlapped or partially overlapped with a symbol used for sending a side row positioning reference signal SL PRS; a portion of the PSSCH that does not include the second order SCI is mapped to at least one third resource unit that does not include the second order SCI. Through the technical scheme, the problem of how to send the SL PRS and the PSSCH in the same time slot when the SL PRS and sidewalk communication are sent in the shared resource pool is clarified, so that effective receiving of the PSSCH can be ensured.

Description

Resource mapping method, device, terminal, chip and storage medium Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and specifically to a resource mapping method, device, terminal, chip, and storage medium. Background Art

[0002] To improve positioning accuracy, especially to achieve positioning of User Equipment (UE) outside the coverage of cellular networks, feasibility and performance studies of positioning technology based on Sidelink Positioning Reference Signal (SL PRS) have been completed.

[0003] When SL PRS shares a resource pool with Rel-16 / 17 / 18 sidelink communications, the UE needs to send SL PRS and the Physical Sidelink Shared Channel (PSSCH) in the same time slot. However, how to send SL PRS and PSSCH in the same time slot is an unresolved issue.

[0004] Summary of the Invention

[0005] Embodiments of the present application provide a resource mapping method, device, terminal, chip, and storage medium.

[0006] In the first aspect, an embodiment of the present application provides a resource mapping method, which is applied to a terminal, and the method includes: mapping the second-order sidelink control information SCI in the physical sidelink shared channel PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; the demodulation reference signal of the PSSCH exists on the symbol where the first resource unit is located; at least one second resource unit does not overlap or partially overlaps with the symbol used to send the sidelink positioning reference signal SL PRS; mapping the part of the PSSCH that does not contain the second-order SCI to at least one third resource unit that does not contain the second-order SCI.

[0007] In the second aspect, an embodiment of the present application provides a resource mapping device, which includes: a first mapping unit, used to map the second-order sidelink control information SCI in the physical sidelink shared channel PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; there is a demodulation reference signal of the PSSCH on the symbol where the first resource unit is located; at least one second resource unit does not overlap or partially overlaps with the symbol used to send the sidelink positioning reference signal SL PRS; a second mapping unit, used to map the part of the PSSCH that does not contain the second-order SCI to at least one third resource unit that does not contain the second-order SCI.

[0008] In a third aspect, an embodiment of the present application provides a terminal including a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to perform the above-mentioned resource mapping method.

[0009] In a fourth aspect, an embodiment of the present application provides a chip for implementing the above-mentioned resource mapping method. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the above-mentioned resource mapping method.

[0010] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium for storing a computer program, which enables a computer to execute the above-mentioned resource mapping method.

[0011] In a sixth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which enable a computer to execute the above-mentioned resource mapping method.

[0012] In a seventh aspect, an embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the above-mentioned resource mapping method.

[0013] Through the above technical solution, it is clarified how to send SL PRS and PSSCH in the same time slot when SL PRS and sideline communication are sent in the shared resource pool, thereby ensuring that PSSCH can be effectively received. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] FIG1 is a schematic diagram of an example in which part of the symbols in a time slot are used for SL transmission;

[0016] FIG2 is a schematic diagram of an example of a time slot structure of PSCCH and PSSCH;

[0017] FIG3 is a schematic diagram of the time domain position of 4 DMRS symbols when the PSSCH has 13 symbols;

[0018] FIG4 is a schematic diagram of an example of the PSSCH DMRS frequency domain position;

[0019] Figure 5 is a schematic diagram of an example of PSCCH and PSSCH resource pools in NR-V2X;

[0020] FIG6 is a schematic diagram of an example of a time slot structure of an NR system;

[0021] FIG7 is a schematic diagram showing an example of comb tooth size and RE offset;

[0022] FIG8 is a schematic diagram of an example of interleaving resource blocks;

[0023] FIG9 is a schematic diagram of an example of a frame structure based on interleaved resource blocks;

[0024] FIG10 is a schematic diagram of an example of an RB set;

[0025] FIG11 is a schematic diagram of a flow chart of a resource mapping method provided in an embodiment of the present application;

[0026] FIG12 is a schematic diagram of an example of resource mapping provided in an embodiment of the present application;

[0027] FIG13 is a second schematic diagram of an example of resource mapping provided in an embodiment of the present application;

[0028] FIG14 is a third schematic diagram of an example of resource mapping provided in an embodiment of the present application;

[0029] FIG15 is a schematic diagram of an example of candidate time domain positions for SL PRS transmission in a resource pool provided in an embodiment of the present application;

[0030] FIG16 is a schematic diagram of the structure of a resource mapping device provided in an embodiment of the present application;

[0031] FIG17 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0032] FIG18 is a schematic structural diagram of a chip according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The technical solutions of the embodiments of the present application can be applied to various side communication systems. To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are explained below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0035] 1. Timeslot Structure in New Radio-Vehicle to Everything (NR-V2X)

[0036] In NR-V2X, PSSCH and its associated physical sidelink control channel (PSCCH) are transmitted in the same time slot, and PSCCH occupies 2 or 3 time domain symbols. Among them, the time domain resource allocation of NR-V2X is based on the time slot as the allocation granularity, and the parameters sl-startSLsymbols and sl-lengthSLsymbols are used to configure the starting point and length of the time domain symbols used for sidelink transmission in a time slot. The last symbol in this part of symbols is used as the guard period (GP), and PSSCH and PSCCH can only use the remaining time domain symbols. However, if the physical sidelink feedback channel (PSFCH) transmission resources are configured in a time slot, then PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the automatic gain control (AGC) and GP symbols before the symbol.

[0037] Figure 1 shows how some symbols in a time slot are used for sidelink (SL) transmission. As shown in Figure 1, if the network configuration sl-StartSymbol = 3 and sl-LengthSymbols = 11, then the 11 time-domain symbols starting from symbol index 3 in a time slot can be used for sidelink transmission. This time slot contains PSFCH transmission resources, which occupy symbols 11 and 12. Symbol 11 serves as the PSFCH AGC symbol, and symbols 10 and 13 serve as GPs. The time-domain symbols available for PSSCH transmission are symbols 3 through 9. The PSCCH occupies three time-domain symbols: symbols 3, 4, and 5, with symbol 3 typically used as the AGC symbol.

[0038] In NR-V2X, in addition to PSCCH and PSSCH, PSFCH may also exist in a sidelink time slot. In a time slot, the first Orthogonal Frequency Divisition Multiplexing (OFDM) symbol is fixed for automatic gain control AGC. On the AGC symbol, the UE copies the information sent on the second symbol. One symbol is reserved at the end of the time slot for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sidelink symbol. In the frequency domain, the number of physical resource blocks (PRBs) occupied by PSCCH is within the subband range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a subchannel of PSSCH, or the frequency domain resources of PSSCH include multiple subchannels, then PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol where PSCCH is located.

[0039] The PSSCH is used to carry second-order sidelink control information (SCI) and the sidelink shared channel (SL-SCH). 3GPP R16 defines two second-order SCI formats: SCI format 2-A and SCI format 2-B. SCI format 2-B is suitable for multicast communications that use distance information for sidelink hybrid automatic repeat request (HARQ) feedback. SCI format 2-A is suitable for other scenarios, such as unicast, multicast, and broadcast communications that do not require sidelink HARQ feedback, unicast communications that require sidelink HARQ feedback, and multicast communications that require feedback of positive acknowledgment (ACK) or negative acknowledgment (NACK). 3GPP R17 introduced an additional second-order SCI format, SCI format 2-C, to indicate reference resource sets and trigger signaling in specific situations. The modulation symbols of the second-order SCI are mapped starting from the symbol where the first PSSCH modulation and demodulation reference signal is located, using the frequency domain first and then the time domain method, and are multiplexed on this symbol with the resource element (RE) of the demodulation reference signal (DMRS) through interleaving. In addition, the modulation symbols of the second-order SCI cannot be mapped to the RE where the phase tracking reference signal (PT-RS) is located, as shown in Figure 2.

[0040] In the sidecar communication system, the UE's autonomous resource selection or the determination of transmission resources based on the network's sidecar resource scheduling may cause different UEs to send PSCCH on the same time-frequency resources. In order to ensure that the receiver can detect at least one PSCCH in the event of a PSCCH resource conflict, LTE-V2X adopts a PSCCH DMRS randomization design scheme. Specifically, when sending PSCCH, the UE can randomly select a value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple UEs use different cyclic shifts to send PSCCH DMRS on the same time-frequency resources, the receiving UE can still detect at least one PSCCH through the orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCC) for the transmitting UE to randomly select, as shown in Table 1, where the i-th bit of the OCC mask is applied to the i-th DMRS RE in the RB, thereby achieving the effect of distinguishing different UEs.

[0041] Table 1 PSCCH DMRS OCC mask

[0042] The DMRS for the PSSCH in NR-V2X draws on the design of the New Radio (NR) Uu interface and uses multiple time-domain PSSCH DMRS patterns. Within a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 2. Figure 3 shows a schematic diagram of the time-domain positions of four DMRS symbols when the PSSCH has 13 symbols.

[0043] Table 2 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0044] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation, while low-speed UEs can use a low-density DMRS pattern, thereby improving spectrum efficiency.

[0045] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, p i The i-th CRC bit of the PSCCH that schedules the PSSCH, where L=24 is the number of bits of the PSCCH CRC.

[0046] The NR Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single symbol DMRS frequency domain type 1 supports 4 DMRS ports, single symbol DMRS frequency domain type 2 can support 6 DMRS ports, and in the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support two DMRS ports at most, only single symbol DMRS frequency domain type 1 is supported, as shown in Figure 4.

[0047] 2. Determination of NR-V2X frequency domain resources

[0048] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the frequency domain resource allocation granularity is also subchannel. The number of PRBs included in a subchannel is {10, 12, 15, 20, 50, 75, 100}. The minimum subchannel size is 10 PRBs, which is much larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is mainly because the frequency domain resources of the PSCCH in NR-V2X are located in the first subchannel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a PSSCH subchannel, while the time domain resources of the PSCCH occupy two or three OFDM symbols. If the subchannel size is configured too small, the available PSCCH resources will be limited, the code rate will increase, and the detection performance of the PSCCH will be reduced. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resources must be less than or equal to the PSSCH subchannel size.

[0049] The following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools:

[0050] 1) Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs included in a subchannel in the resource pool, and the value range is {10, 12, 15, 20, 50, 75, 100} PRBs;

[0051] 2) Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0052] 3) Subchannel starting RB index (sl-StartRB-Subchannel): indicates the starting PRB index of the first subchannel in the resource pool;

[0053] 4) PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0054] 5) PSCCH frequency domain resource indication (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0055] When the UE determines the resource pool for PSSCH transmission or PSSCH reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels starting from the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs contained in the final sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0056] In NR-V2X, the frequency domain starting position of the first subchannel of PSCCH and its associated PSSCH is aligned. Therefore, the starting position of each PSSCH subchannel is the possible frequency domain starting position of PSCCH. According to the above parameters, the frequency domain range of the resource pool of PSCCH and PSSCH can be determined, as shown in Figure 5.

[0057] In NR-V2X, PSCCH is used to carry side control information related to resource sensing, including:

[0058] 1) The priority of the scheduled transmission;

[0059] 2) Frequency domain resource allocation: Indicates the number of frequency domain resources of PSSCH in the current time slot scheduled by PSCCH, as well as the number and starting position of frequency domain resources of up to two retransmission resources reserved;

[0060] 3) Time domain resource allocation: indicates the time domain locations of up to two retransmission resources;

[0061] 4) PSSCH reference signal pattern;

[0062] 5) Second-level SCI format;

[0063] 6) Second-order SCI rate offset;

[0064] 7) Number of PSSCH DMRS ports;

[0065] 8) Modulation and Coding Scheme (MCS);

[0066] 9)MCS form instructions;

[0067] 10) Number of PSFCH symbols;

[0068] 11) Resource reservation period: reserves resources for sending another transport block (TB) in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0069] 12) Reserved bits: 2 to 4 bits. The specific number of bits is configured or pre-configured by the network.

[0070] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0071] 3. Determination of NR-V2X time domain resources (time slots)

[0072] In NR-V2X, the transmission of PSCCH / PSSCH is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot. It does not support the transmission of multiple PSCCH / PSSCHs in one time slot through time division multiplexing (TDM). The PSCCH / PSSCH between different users can be multiplexed in one time slot through frequency division multiplexing (FDM). The time domain resources of PSSCH in NR-V2X are based on the time slot granularity, but unlike the PSSCH in LTE-V2X that occupies all the time domain symbols in a subframe, the PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmission is also based on the subframe granularity, so the side transmission is also based on the subframe granularity (special subframes in the time division duplexing (TDD) system are not used for side transmission). The NR system adopts a flexible time slot structure, that is, a time slot includes both uplink and downlink symbols, which can achieve more flexible scheduling and reduce latency.

[0073] Figure 6 shows an example of the timeslot structure of an NR system. As shown in Figure 6, a timeslot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols are located at the beginning of the timeslot, uplink symbols are located at the end of the timeslot, and flexible symbols are located between the downlink and uplink symbols. The number of each type of symbol in each timeslot is configurable.

[0074] The sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact the uplink and downlink data transmission of the NR system and reduce system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, that is, a portion of the uplink symbols in a timeslot are used for sidelink transmission. In addition, considering that sidelink transmission includes AGC symbols and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing AGC symbols and GP symbols will leave even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0075] As mentioned above, NR-V2X configures the starting point and length of the time domain symbol used for sideline transmission in a time slot through the parameters starting symbol position (sl-StartSymbol) and number of symbols (sl-LengthSymbols). The last symbol in the time domain symbol used for sideline transmission is used as the guard interval GP. PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbol used for PSFCH transmission, as well as the AGC and GP symbols before the symbol.

[0076] In the NR-V2X system, the time domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within an SFN cycle is the same as that in LTE-V2X, but with the following two differences:

[0077] 1) The total number of time slots included in an SFN cycle is 10240×2^μ, where the parameter μ is related to the subcarrier spacing;

[0078] 2) If at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0079] The method of determining the time slot position belonging to the resource pool within an SFN cycle may include the following steps:

[0080] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0081] Where: N S_SSB Indicates the number of synchronization slots within a System Frame Number (SFN) cycle. The synchronization slot is determined based on synchronization-related configuration parameters and is related to the period of transmission of the Synchronization Signal Block (SSB) and the number of SSB transmission resources configured within the period. nonSL Indicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: If at least one of the time domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0082] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0083] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the conditions of formula (1), then the time slot is a reserved time slot:

[0084] Where: N reserved =(10240×2 μ -NS_SSB -N nonSL )mod L bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0085] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0086] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0087] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set When b is satisfied k′ =1, the time slot belongs to the resource pool, where k′=k mod L bitmap .

[0088] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order Among them, T′ max Indicates the number of time slots included in the resource pool.

[0089] 4. Downlink-based positioning

[0090] In downlink positioning, up to four positioning frequency layers (Frequency Layer) DL Positioning Reference Signal (PRS) configurations can be provided for a UE. The following PRS signal configuration parameters are provided in the parameter structure of each positioning frequency layer:

[0091] 1) Subcarrier spacing of the PRS signal;

[0092] 2) The cyclic prefix (CP) length of the PRS signal;

[0093] 3) PRS frequency domain resource bandwidth: This parameter is the number of PRBs allocated to the PRS signal. The minimum PRS resource bandwidth is 24 PRBs, the granularity is 4 PRBs, and the maximum is 272 PRBs.

[0094] 4) Frequency domain starting frequency position of PRS resource: This parameter defines the index of the starting PRB of the PRS signal in the frequency domain. The PRB index is defined relative to Point A of the PRS;

[0095] 5) Frequency domain reference point PointA of the PRS signal;

[0096] 6) Comb-N size of the PRS signal.

[0097] The above PRS parameters configured in each positioning frequency layer will be applied to all PRS resources contained in the positioning frequency layer. That is to say, in a positioning frequency layer, all PRS signals from multiple different transmission and reception points (TRPs) will use the same subcarrier spacing and cyclic prefix (CP) length, the same comb size, be sent on the same frequency subband, and occupy exactly the same bandwidth. This design can support the UE to simultaneously receive and measure PRS signals from multiple different TRPs that are sent on the same frequency point.

[0098] The parameters of the TRP layer include the ID parameter used to uniquely identify the positioning TRP, the physical cell ID of the TRP, the NR cell global identifier (NCGI) of the TRP, and the Absolute Radio Frequency Channel Number (ARFCN) of the TRP. Up to two DL PRS resource sets can be configured in each TRP layer. The DL PRS resource set layer parameters configure the following parameters, which will apply to all DL PRS resources contained in the resource set. The configured parameters include:

[0099] 1) DL PRS resource set identification ID (nr-DL-PRS-ResourceSetID).

[0100] 2) DL PRS transmission period and time slot offset (dl-PRS-Periodicity-and-ResourceSetSlotOffset): This parameter defines the time domain transmission behavior of all DL PRS resources contained in the DL PRS resource set. The minimum value of the configurable DL PRS transmission period is 4 milliseconds, and the maximum value is 10240 milliseconds. The configuration of DL PRS supports flexible subcarrier spacing, including 15KHz, 30KHz, 60KHz and 120KHz. Under different subcarrier spacing conditions, the range of configurable DL PRS transmission period values ​​is the same. Figure 7 shows a schematic diagram of a comb size of 2 and RE offsets of 0 and 1.

[0101] 3) DL PRS resource repetition factor (dl-PRS-ResourceRepetitionFactor): This parameter defines the number of repeated transmissions of a PRS resource in each PRS period. The repeated transmission of the same DL PRS resource can be used by the UE to aggregate the DL PRS signal energy of multiple transmissions, thereby increasing the coverage distance of the DL PRS and increasing the positioning accuracy. In the FR2 system, the repeated transmission of the DL PRS resource can be used by the UE to perform receive beam scanning operations. The UE can use different receive beams to receive the repeated transmission of the same DL PRS resource to find the best TRP transmit beam and UE receive beam match. On the other hand, the repeated transmission of DL PRS resources will increase the overhead of PRS. In the 3GPP NR R16 specification, the repetition factor of the DL PRS resource is 1, 2, 4, 6, 8, 16 and 32.

[0102] 4) DL PRS resource retransmission time interval (dl-PRS-ResourceTimeGap): This parameter defines the number of time slots between two consecutive retransmissions of the same PRS resource.

[0103] 5) Muting configuration of DL PRS: This parameter is used to define that the DL PRS signal is not sent on certain allocated time-frequency resources (called Muting). Muting means that the DL PRS signal is not sent on all allocated time-frequency resources, but is intentionally not sent on certain designated time-frequency resources. The purpose of doing this is to avoid conflicts with other signals such as SSB on the one hand, and to avoid interference between signals sent by different TRPs on the other hand. For example, the DL PRS transmission of a certain TRP is intentionally turned off at certain moments so that the UE can receive the DL PRS signal from a farther TRP. The muting operation of PRS will be explained in detail in the subsequent description, so I will not go into details here.

[0104] 6) Number of OFDM symbols occupied by DL PRS resources (dl-PRS-NumSymbols): This parameter defines the number of OFDM symbols allocated to a DL PRS resource within a time slot.

[0105] As mentioned above, all parameters configured in a DL PRS resource set are applied to all DL PRS resources contained in the resource set. Therefore, all DL PRS resources in the same DL PRS resource set have the same transmission period, the same number of repetitions, and occupy the same number of OFDM symbols.

[0106] Each DL PRS resource can be configured with the following parameters:

[0107] 1) A DL PRS resource identification ID (nr-DL-PRS-ResourceID).

[0108] 2) DL PRS sequence ID (dl-PRS-SequenceID).

[0109] 3) DL PRS Starting Frequency Resource Unit Offset (dl-PRS-CombSizeN-AndReOffset): This parameter defines the frequency resource unit offset used for resource mapping of the DL PRS resource to the first allocated OFDM symbol within a slot. Based on this parameter and the relative offset values ​​specified in TS 38.211, the UE can determine the frequency resource unit offset used for resource mapping on each OFDM symbol.

[0110] 4) DL PRS Resource Slot Offset (dl-PRS-ResourceSlotOffset): This parameter defines the time slot offset relative to the DL PRS resource set. This parameter can determine the time slot position of each DL PRS resource.

[0111] 5) DL PRS OFDM symbol offset (dl-PRS-ResourceSymbolOffset): This parameter defines the time-frequency resource allocation position of a DL PRS resource within a time slot. It indicates the index of the starting OFDM symbol of the DL PRS resource within a time slot.

[0112] 6) DL PRS QCL information (dl-PRS-QCL-Info): This parameter provides the Quasi Co-Location (QCL) information of the DL PRS signal.

[0113] 5. Sidelink Over Unlicensed Spectrum (SL-U)

[0114] When performing sidelink transmissions on unlicensed spectrum, sidelink transmissions must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, the UE must occupy no less than 80% of the channel bandwidth when using the channel for data transmission. For maximum power spectral density requirements, the UE's transmit power per 1MHz cannot exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmissions on unlicensed spectrum must adopt an interlaced resource block (IRB) structure. An IRB consists of N discrete resource blocks (RBs) in the frequency domain, with a total of M IRBs within the frequency band. The mth IRB consists of RBs in the order {m, M+m, 2M+m, 3M+m, ...}.

[0115] Figure 8 shows an example of interleaved resource blocks. As shown in Figure 8, the system bandwidth consists of 20 RBs, including 5 IRBs (i.e., M = 5). Each IRB consists of 4 RBs (i.e., N = 4). Adjacent RBs in the same IRB have the same frequency domain spacing, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB indexes.

[0116] In the SL-U system, if IRB-based resource allocation granularity is adopted, channels such as the PSCCH and PSSCH in the SL-U system should all be based on the IRB structure. In this case, the frame structure of the SL-U system is shown in Figure 9. The numbers in the boxes in Figure 9 represent the IRB index. Figure 9 illustrates a frame structure in which only the PSCCH and PSSCH are included in a time slot, excluding the PSFCH. The bandwidth shown in the figure includes 20 RBs, with five IRB resources configured (i.e., M = 5). Each IRB resource consists of four RBs, and the numbers in the boxes represent the IRB index. In Figure 9, the system configures the PSCCH to occupy one IRB resource and two OFDM symbols in the time domain. The PSSCH uses IRB granularity, with the first symbol in the time slot being an AGC symbol and the last symbol being a GP symbol. In the figure, PSSCH1 occupies IRB#0 and IRB#1, with its corresponding PSCCH1 occupying IRB#0. PSSCH2 occupies IRB#2, with its corresponding PSCCH2 also occupying IRB#2. It should be noted that, for the sake of simplicity, FIG9 does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0117] In unlicensed spectrum, UEs access channels using Listen Before Talk (LBT). LBT uses a 20MHz granularity in the frequency domain, with each 20MHz interval being called an RB Set. A carrier can contain multiple RB Sets, separated by guard intervals, as shown in Figure 10.

[0118] In unlicensed spectrum, UEs must first perform LBT before they can access the channel. However, the time it takes for a UE to complete LBT is uncertain. If a UE is restricted to transmitting at the start of a timeslot, it may miss a transmission opportunity due to failure to complete LBT before that start. Therefore, SL-U considers adding a transmission starting point within a timeslot, i.e., multi-start transmission. For example, the additional starting point can be the third or fourth OFDM symbol within the timeslot.

[0119] 6. Positioning based on sidelink

[0120] In 3GPP R-17, the 3GPP Radio Access Network (RAN) conducted research on "NR positioning enhancements" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage." The "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage" study focused on V2X and public safety use cases. In addition, the 3GPP SA1 working group also developed requirements for "ranging-based services" and positioning accuracy requirements for Industrial Internet of Things (IIoT) use cases in out-of-coverage scenarios. 3GPP needs to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0121] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies on positioning technology based on side-track positioning reference signals in the early stages of Rel-18. Next, 3GPP will standardize solutions for side-track positioning (including ranging and direction finding) in NR systems, including:

[0122] 1) Standardized SL PRS. SL PRS uses a frequency domain structure based on a comb (not excluding the full RE mapping mode), adopts a sequence format based on a pseudo-random sequence, uses the existing DL-PRS sequence as the design starting point, and supports a maximum SL PRS bandwidth of 100 MHz in FR1.

[0123] 2) Standardize the measurement quantities used to support SL RTT, SL-AOA and SL-TDOA positioning methods.

[0124] 3) Standardize SL PRS resource allocation schemes, including Scheme 1 and Scheme 2. Scheme 1 involves network-allocated SL PRS resources, while Scheme 2 involves UE-independent SL PRS resource selection. Support is provided for both a shared resource pool for SL PRS and Rel-16 / 17 / 18 sidelink communications, as well as a dedicated SL PRS resource pool. For Scheme 2, research and standardization are required for channel sensing-based resource selection, random resource selection, congestion control, and / or UE-coordinated resource selection.

[0125] 4) Standardize the open-loop power control mechanism for SL PRS transmission, etc.

[0126] The above briefly explains the relevant technologies / terms involved in the embodiments of this application, which will not be repeated in the following embodiments.

[0127] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship. It should also be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B. It should also be understood that the "correspondence" mentioned in the embodiments of this application can mean that there is a direct or indirect correspondence relationship between the two, or it can also mean that there is an association relationship between the two, or it can be a relationship of indication and indication, configuration and configuration, etc. It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). This application does not limit its specific implementation method.

[0128] It should also be understood that the terminal in the embodiments of the present application may refer to an access terminal, user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent, or a user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handheld terminal, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolution network, etc.

[0129] To improve positioning accuracy, especially for terminals outside cellular network coverage, feasibility and performance studies have been completed on positioning technology based on the SL PRS. When the SL PRS shares a resource pool with Rel-16 / 17 / 18 sidelink communications, the terminal needs to transmit the SL PRS and PSSCH in the same timeslot. However, how to transmit the SL PRS and PSSCH in the same timeslot remains an unresolved issue.

[0130] In view of this, the present application provides a resource mapping method, apparatus, terminal, chip, and storage medium. This method is applicable to both licensed and unlicensed spectrum. The method can be executed, for example, by a terminal, or by a chip, chip system, or circuit configured in the terminal, although this is not a limitation in the embodiments of the present application. For ease of description, the following description uses execution by a terminal as an example.

[0131] In this method, the terminal may map the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit. The demodulation reference signal (hereinafter referred to as PSSCH DMRS) of the PSSCH exists on the symbol where the first resource unit is located; the at least one second resource unit does not overlap or partially overlaps with the symbol used to send the SL PRS. Furthermore, the terminal may map the part of the PSSCH that does not contain the second-order SCI to at least one third resource unit that does not contain the second-order SCI. This method clarifies the problem of how to send SL PRS and PSSCH in the same time slot when SL PRS and sideline communications are sent in a shared resource pool, thereby ensuring that the PSSCH can be effectively received.

[0132] It should be noted that the "symbol" mentioned in the embodiments of the present application refers to the "OFDM symbol" unless otherwise specified. In other words, the "symbol" and "OFDM symbol" in the embodiments of the present application can be used interchangeably unless otherwise specified.

[0133] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and all of them fall within the scope of protection of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0134] FIG11 is a flow chart of a resource mapping method provided in an embodiment of the present application. As shown in FIG11 , the resource mapping method may include the following steps:

[0135] S1101, map the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; there is a PSSCH DMRS on the symbol where the first resource unit is located; at least one second resource unit does not overlap or partially overlaps with the symbol used to send SL PRS.

[0136] Among them, mapping the second-order SCI in the PSSCH to at least one (i.e. one or more) second resource units including the first resource unit can also be understood as mapping the complex-valued modulation symbols of the PSSCH to at least one second resource unit including the first resource unit.

[0137] As an implementation, the symbol where the first resource unit resides may contain, for example, the first PSSCH DMRS in the time slot. That is, the second-order SCI in the PSSCH may be mapped starting from the symbol where the first PSSCH DMRS in the time slot resides. Taking Figure 12 as an example (where numbers 0 to 13 represent symbol indices), the symbol where the first PSSCH DMRS in the time slot resides is symbol #4, so the second-order SCI in the PSSCH may be mapped starting from symbol #4.

[0138] In this embodiment, the at least one second resource unit does not overlap or partially overlaps with the symbol used to send SL PRS. The at least one second resource unit does not overlap with the symbol used to send SL PRS, which can also be understood as there is no intersection between the at least one second resource unit and the symbol used to send SL PRS, or it can also be understood as the at least one second resource unit does not occupy the symbol used to send SL PRS; The at least one second resource unit partially overlaps with the symbol used to send SL PRS, which can also be understood as there is an intersection between the at least one second resource unit and the symbol used to send SL PRS, for example, some resource units in the at least one second resource unit may occupy part of the symbol used to send SL PRS.

[0139] In some embodiments, mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit includes: mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit in the order of frequency domain first, time domain second and index increasing. That is, the terminal can map the second-order SCI in the PSSCH from the first resource unit in the time slot to one or more consecutive second resource units. Taking Figure 12 as an example, the terminal can, for example, map the second-order SCI in the PSSCH from the first resource unit in symbol #4 to multiple consecutive second resource units including the first resource unit. In Figure 12, the multiple consecutive second resource units exist on symbol #4 and symbol #5.

[0140] In some embodiments, mapping the second-order SCI in the PSSCH, starting from the first resource unit in the time slot, to at least one second resource unit including the first resource unit includes: preferentially mapping the second-order SCI in the PSSCH, starting from the first resource unit in the time slot, to at least one fourth resource unit including the first resource unit, where a PSSCH DMRS and / or PSCCH exists on a symbol where the fourth resource unit is located; the at least one second resource unit includes the at least one fourth resource unit. In other words, the terminal may preferentially map the second-order SCI in the PSSCH to symbols where the PSSCH DMRS and / or PSCCH exist within the time slot.

[0141] As an implementation manner, the terminal may, for example, perform mapping of the second-order SCI in the PSSCH according to the following steps 1 to 3:

[0142] Step 1: Map the second-order SCI in the PSSCH to symbols containing PSSCH DMRS, starting from the first resource element in the time slot. For example, the second-order SCI can be mapped to symbols containing PSSCH DMRS, starting from the first symbol containing PSSCH DMRS in the time slot.

[0143] Step 2: If there are any remaining second-order SCIs after mapping in accordance with Step 1, the remaining second-order SCIs are mapped to symbols that contain PSCCHs within the time slot. For example, if there are any remaining second-order SCIs, the second-order SCIs can be mapped to symbols that contain PSCCHs within the time slot, starting from the first symbol that contains PSCCHs within the time slot, and the resource units that meet the mapping requirements are not occupied by the second-order SCIs mapped in Step 1.

[0144] Step 3: If there are still remaining second-order SCIs after mapping in accordance with steps 1 and 2, it is possible to determine whether there are any unoccupied resource units starting from the first symbol in the time slot, and then map the remaining second-order SCIs to the unoccupied resource units in the time slot.

[0145] It should be noted that the "first symbol" mentioned in the embodiments of the present application refers to the first symbol in the time slot that does not include AGC (such as symbol #2 in Figures 12, 13, and 14).

[0146] Taking Figure 13 as an example (numbers 0 to 13 in the figure represent symbol indexes), based on steps 1 to 3 above, the terminal can first map the second-order SCI in the PSSCH to the symbols of the PSSCH DMRS in the time slot (such as symbols #4 and #10 in Figure 13); if there is any second-order SCI remaining, the remaining second-order SCI can be mapped to the symbols of the PSCCH in the time slot (such as symbols #1, #2 and #3 in Figure 13); if there is still any second-order SCI remaining, it can be determined from the first symbol in the time slot whether there are any unoccupied resource units, and then the remaining second-order SCI can be mapped to the unoccupied resource units.

[0147] According to the method of this embodiment, on the one hand, by preferentially mapping the second-order SCI to the symbol where the PSSCH DMRS exists, the decoding performance of the second-order SCI and the measurement accuracy related to positioning can be improved. On the other hand, since the PSCCH and the SL PRS cannot exist in the same symbol at the same time, that is, the symbol where the PSCCH exists cannot be mapped to the SL PRS, therefore, by preferentially mapping the second-order SCI to the symbol where the PSCCH exists (for example, when there are no remaining available resources on the symbol where the PSSCH DMRS is located, the second-order SCI can be preferentially mapped to the symbol where the PSCCH exists), resource utilization can be improved, thereby avoiding resource waste.

[0148] In some embodiments, the second resource unit is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS (demodulation reference signal for PSCCH), or PT-RS. That is, in the process of mapping the second-order SCI in the PSSCH to the second resource unit, it is also necessary to meet the following requirements: the second resource unit is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS (demodulation reference signal for PSCCH), or PT-RS.

[0149] In some embodiments, the method may further include: adjusting the code rate offset of the second-order SCI so that the second resource unit mapping the second-order SCI does not overlap with the symbol used to send the SL PRS. That is, in order to prevent the second resource unit mapping the second-order SCI from overlapping with the symbol used to send the SL PRS, this can be achieved by adjusting the code rate offset of the second-order SCI. For example, in the rate matching process of the second-order SCI, the code rate offset of the second-order SCI selected by the terminal is This ensures that the second-order SCI cannot eventually occupy the symbols used to send the SL PRS, thereby avoiding collision between the second-order SCI and SL PRS resources.

[0150] In some embodiments, the method may further include: when the at least one second resource unit does not overlap with the symbol used to send the SL PRS, if there is remaining second-order SCI after mapping the second-order SCI to the at least one second resource unit, then discarding the remaining second-order SCI.

[0151] That is to say, on the premise that the at least one second resource unit does not overlap with the symbol used to send SL PRS, if in the process of mapping the second-order SCI in a prescribed order (such as the order of ascending index), there is some redundant second-order SCI that will overlap with the symbol used to send SL PRS, then the terminal can discard (drop) the redundant second-order SCI to ensure that the second-order SCI does not occupy the symbol used to send SL PRS, thereby avoiding the collision between the second-order SCI and SL PRS resources, and simplifying the rate matching of the second-order SCI.

[0152] In some embodiments, when the at least one second resource unit partially overlaps with a symbol used to transmit the SL PRS, the mapped SL PRS in the overlapping portion may be covered by the second-order SCI in the second resource unit. That is, when a resource collision occurs between the second-order SCI and the SL PRS, the terminal may use the second-order SCI to cover the mapped SL PRS to simplify the mapping method of the second-order SCI.

[0153] As an example, before mapping the second-order SCI, the terminal may first map the SL PRS to the symbols used to transmit the SL PRS. Subsequently, the terminal may map the second-order SCI in a specified order (e.g., order of increasing index). If, during the mapping of the second-order SCI, the second-order SCI overlaps (collides) with the mapped SL PRS, the terminal may overwrite the mapped SL PRS with the second-order SCI.

[0154] Taking Figure 14 as an example (numbers 0 to 13 in the figure represent symbol indices), the SL PRS can first be mapped to the symbols used to transmit the SL PRS (i.e., symbols #6 to #9). Subsequently, the second-order SCI can be mapped starting from symbol #4 in ascending order of index. On symbol #6, the second-order SCI overlaps with the symbol used to transmit the SL PRS. In this case, the overlapping second-order SCI can overwrite the SL PRS mapped in symbol #6.

[0155] In some embodiments, in the symbol corresponding to the overlapping portion, the mapped SL PRS that is not covered by the second-order SCI in the second resource unit is allowed to be covered by the portion of the PSSCH that does not include the second-order SCI.

[0156] As shown in symbol #6 in Figure 14, the portion of the PSSCH that does not contain the second-order SCI can be mapped to symbol #6, which already has the second-order SCI and SL PRS mapped to it. In this case, the portion of the PSSCH that does not contain the second-order SCI can overlay the SL PRS mapped to symbol #6. This helps avoid the impact of the second-order SCI on the SL PRS.

[0157] In some embodiments, before mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit, the method may further include: mapping the SL PRS to a symbol for transmitting the SL PRS.

[0158] For example, before mapping the second-order SCI to the at least one second resource unit, the terminal may determine a symbol for transmitting the SL PRS, and map the SL PRS to the determined symbol for transmitting the SL PRS.

[0159] In an embodiment of the present application, the terminal may determine the symbol used to send the SL PRS, for example, by any one of the following methods 1 to 3. Determining the symbol used to send the SL PRS can also be understood as determining the time domain position of the symbol used to send the SL PRS. It can be understood that the symbol used to send the SL PRS determined by the terminal in the embodiment of the present application is selected from the time-frequency resources indicated by the sideline authorization.

[0160] As an implementation method, the time domain position of the symbol used to send the SL PRS can be determined based on the number of symbols used to send the SL PRS and the starting symbol position. In other words, by determining the number of symbols used to send the SL PRS (for example, denoted as M) and the starting symbol position of the symbol used to send the SL PRS (for example, denoted as S), the time domain position of the symbol used to send the SL PRS can be determined (or the symbol used to send the SL PRS can be determined).

[0161] Taking Figure 12 as an example, the number M of symbols used to send the SL PRS determined by the terminal is 4, and the starting symbol position S of the symbols used to send the SL PRS is determined to be the position where symbol #6 is located. At this time, the time domain positions of the symbols used to send the SL PRS determined by the terminal are the positions where symbols #6 to #9 are located, or in other words, the symbols used to send the SL PRS determined by the terminal are symbols #6 to #9.

[0162] The following describes methods 1 to 3 for the terminal to determine the symbols used to send the SL PRS.

[0163] Method 1:

[0164] The time domain position of the symbol used to send SL PRS is determined by the media access control (MAC) layer or physical layer of the terminal from the candidate time domain positions in the resource pool, or is determined by the physical layer of the terminal from the candidate time domain positions in the resource pool based on the first symbol number; wherein the candidate time domain position is pre-configured or network configured; the first symbol number is the minimum number of symbols determined by the MAC layer for sending SL PRS.

[0165] In some embodiments, multiple candidate time domain positions may be preconfigured in the resource pool or configured by the network. For example, multiple starting symbol positions S that can be used to send SL PRS may be preconfigured in the resource pool or configured by the network, and for each starting symbol position S, the corresponding number M of symbols that can be used to send SL PRS may be preconfigured or configured by the network.

[0166] Taking Figure 15 as an example, two starting symbol positions S that can be used to send SL PRS are pre-configured / network-configured in the time slot: symbol #6 and symbol #11. When symbol #6 is used as the starting symbol position S, the corresponding number of symbols M that can be used to send SL PRS is 4; when symbol #11 is used as the starting symbol position S, the corresponding number of symbols M that can be used to send SL PRS is 2.

[0167] In some embodiments, the symbols corresponding to the candidate time-domain positions do not include symbols that may be used to transmit the second-order SCI to avoid collision between the second-order SCI and the SL PRS resources. For example, in Figure 15, the candidate time-domain positions for SL PRS transmission (i.e., the positions where symbols #6 to #9, symbol #11, and symbol #12 are located) do not include symbols that may be used to transmit the second-order SCI.

[0168] As an example, the time domain positions of the symbols used to transmit the SL PRS may be determined by the MAC layer of the terminal from candidate time domain positions in the resource pool. Taking Figure 15 as an example, the MAC layer of the terminal may select the positions where symbols #6 to #9 are located as the time domain positions of the symbols used to transmit the SL PRS, or the MAC layer of the terminal may select the positions where symbols #11 to #12 are located as the time domain positions of the symbols used to transmit the SL PRS.

[0169] In some embodiments, when the time domain position of the symbol used to send SL PRS is determined by the MAC layer of the terminal, the time domain position of the symbol used to send SL PRS determined by the MAC layer does not include symbols that may be used to send second-order SCI to avoid collision between the second-order SCI and SL PRS resources.

[0170] As another example, the time-domain positions of the symbols used to transmit the SL PRS may be determined by the terminal's physical layer from candidate time-domain positions within the resource pool. Taking Figure 15 as an example, the terminal's physical layer may select the positions of symbols #6 to #9 as the time-domain positions of the symbols used to transmit the SL PRS. Alternatively, the terminal's physical layer may select the positions of symbols #11 to #12 as the time-domain positions of the symbols used to transmit the SL PRS.

[0171] As another example, the time domain position of the symbol for sending SL PRS can be determined by the physical layer of the terminal from the candidate time domain positions in the resource pool based on the first symbol number. The first symbol number is the minimum number of symbols used to send SL PRS, and the first symbol number can be determined by the MAC layer of the terminal and indicated to the physical layer of the terminal, for example. In this case, the number M of symbols for sending SL PRS determined by the physical layer of the terminal must be greater than or equal to the first symbol number. Taking Figure 15 as an example, assuming that the first symbol number determined by the MAC layer is 4, then, since M must be greater than or equal to 4, the physical layer of the terminal can select the positions of symbols #6 to #9 as the time domain positions of the symbols for sending SL PRS.

[0172] It should be noted that in some scenarios, the first number of symbols may also be determined by other higher layers of the terminal. For example, the first number of symbols may be determined by the Sidelink Positioning Protocol (SLPP) layer of the terminal and indicated to the physical layer of the terminal.

[0173] It should also be noted that, in some scenarios, the terminal may determine the symbols used to send the SL PRS in the following manner: other higher layers of the terminal (such as the SLPP layer) may determine the symbols from the candidate time domain positions in the resource pool.

[0174] Method 2:

[0175] The time domain position of the symbol used to send SL PRS is determined by the MAC layer or physical layer of the terminal, or is determined by the physical layer of the terminal based on the first number of symbols; wherein, there is no PSCCH, PSSCH DMRS, PSCCH DMRS or mapped second-order SCI on the symbol used to send SL PRS; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

[0176] As an implementation method, for method 2, the terminal may first perform mapping of the second-order SCI, and then determine the time domain position of the symbol used to send the SL PRS. In other words, for method 2, the time domain position of the symbol used to send the SL PRS can be determined after mapping the second-order SCI to at least one second resource unit.

[0177] As an example, the time domain position of the symbol used to send SL PRS can be determined by the MAC layer of the terminal. For example, the MAC layer of the terminal can first determine the sidelink grant. For each PSSCH and / or SL PRS transmission opportunity (PSSCH occasion and / or SL PRS occasion), if there is a sidelink grant (Sidelink Grant occurring in the PSSCH / SL PRS occasion), the MAC layer of the terminal can determine the time domain position of the symbol used to send SL PRS in the PSSCH and / or SL PRS transmission opportunity where the sidelink grant exists, or in other words, determine the symbol used to send SL PRS. The symbol used to send SL PRS determined by the MAC layer of the terminal must meet the following requirements: there is no PSCCH, PSSCH DMRS, PSCCH DMRS or mapped second-order SCI on the symbol used to send SL PRS.

[0178] As another example, the time domain position of the symbol used to send the SL PRS can be determined by the physical layer of the terminal. For example, the MAC layer of the terminal can first determine the sideline authorization and send (indicate) the determined sideline authorization to the physical layer of the terminal. Thus, the physical layer of the terminal can determine (select) the symbol used to send the SL PRS from the time-frequency resources indicated by the sideline authorization, and the symbol used to send the SL PRS determined by the physical layer of the terminal must meet the following requirements: there is no PSCCH, PSSCH DMRS, PSCCH DMRS or mapped second-order SCI on the symbol used to send the SL PRS.

[0179] As another example, the time domain position of the symbol used to send the SL PRS may be determined by the physical layer of the terminal based on the first symbol number. The first symbol number is the minimum number of symbols used to send the SL PRS, and the first symbol number may be determined by the MAC layer of the terminal and indicated to the physical layer of the terminal, for example. In this case, the number M of symbols used to send the SL PRS determined by the physical layer of the terminal must be greater than or equal to the first symbol number.

[0180] For example, the MAC layer of the terminal may first determine the sideline authorization, and send (indicate) the determined sideline authorization to the physical layer of the terminal. Thus, the physical layer of the terminal may determine (select) the symbols used to send the SL PRS from the time-frequency resources indicated by the sideline authorization. Among them, the symbols used to send the SL PRS determined by the physical layer of the terminal must meet the following requirements: the number M of symbols determined for sending the SL PRS is greater than or equal to the first number of symbols, and there is no PSCCH, PSSCH DMRS, PSCCH DMRS or mapped second-order SCI on the symbols used to send the SL PRS.

[0181] It should be noted that, in some scenarios, the first number of symbols may also be determined by other higher layers of the terminal. For example, the first number of symbols may be determined by the SLPP layer of the terminal and indicated to the physical layer of the terminal.

[0182] It should also be noted that in some scenarios, the terminal may determine the symbols used to send the SL PRS in the following manner: other higher layers of the terminal (such as the SLPP layer) may determine the symbols used to send the SL PRS. The symbols determined to be used to send the SL PRS must satisfy the following requirements: there is no PSCCH, PSSCH DMRS, PSCCH DMRS, or mapped second-order SCI on the symbols used to send the SL PRS.

[0183] According to the method of this embodiment, since the symbols used to transmit the SL PRS can be determined after mapping the second-order SCI, the complexity of second-order SCI resource mapping can be reduced, while increasing the flexibility of SL PRS resource selection. In addition, since the terminal avoids the mapped second-order SCI when determining the symbols used to transmit the SL PRS, collisions between the second-order SCI and the SL PRS resources can be avoided.

[0184] Method 3:

[0185] The time domain position of the symbol used to send SL PRS is determined by the physical layer of the terminal; or, the number of symbols used to send SL PRS is determined by the MAC layer of the terminal, and the starting symbol position of the symbol used to send SL PRS is determined by the physical layer of the terminal based on the number, which is less than or equal to the number of consecutive symbols that can be used to send SL PRS in the time slot.

[0186] As an example, the time domain position of the symbol used to send the SL PRS can be determined by the physical layer of the terminal. For example, after the physical layer of the terminal receives the sidelink grant indicated by the MAC layer, it can determine (select) the symbol used to send the SL PRS from the time-frequency resources indicated by the sidelink grant.

[0187] As another example, the number M of symbols used to transmit the SL PRS may be determined by the MAC layer of the terminal, and the starting symbol position S of the symbols used to transmit the SL PRS may be determined based on M by the physical layer of the terminal.

[0188] For example, after the MAC layer of the terminal determines the value of M, it may indicate the sidelink grant and the value of M to the physical layer of the terminal. Thus, the physical layer of the terminal may determine the positions of M consecutive symbols used to send the SL PRS within the time slot based on the sidelink grant and the value of M. That is, after the MAC layer of the terminal determines the value of M, the physical layer of the terminal may determine the starting symbol position S of the symbols used to send the SL PRS based on the value of M.

[0189] In some scenarios, the value of M can also be determined by other higher layers of the terminal. For example, the value of M can be determined by the SLPP layer of the terminal and indicated to the physical layer of the terminal. Thus, the physical layer of the terminal can determine the positions of M consecutive symbols used to transmit the SL PRS within the time slot based on the sidelink grant and the value of M indicated by the SLPP layer, or in other words, determine the starting symbol position S of the symbols used to transmit the SL PRS.

[0190] In some embodiments, the value of M determined by the MAC layer should be less than or equal to the number of consecutive symbols that can be used to send SL PRS in the time slot. The number of consecutive symbols that can be used to send SL PRS in the time slot can be, for example, the number of consecutive symbols that do not contain PSSCH DMRS and PSCCH in the current time slot. For example, in Figure 15, there can be a maximum of 5 consecutive symbols that do not contain PSSCH DMRS and PSCCH in the time slot (i.e., symbol #5 to symbol #9). Then, the value of M determined by the MAC layer should be less than or equal to 5, so as to ensure that the physical layer of the terminal can select M consecutive symbols that meet the conditions for sending SL PRS in the current time slot.

[0191] In some embodiments, PSCCH, PSSCH DMRS, or PSCCH DMRS does not exist on the symbol used to send SL PRS. That is, the symbol finally determined by the physical layer to send SL PRS must satisfy the following: PSCCH, PSSCH DMRS, or PSCCH DMRS does not exist on the M consecutive symbols determined to send SL PRS.

[0192] It should be noted that, in some scenarios, the terminal may determine the symbols used to send the SL PRS in the following manner: other higher layers of the terminal (such as the SLPP layer) may determine the symbols used to send the SL PRS. The symbols determined for sending the SL PRS must satisfy the following conditions: there is no PSCCH, PSSCH DMRS, PSCCH DMRS, or mapped second-order SCI on the symbols used to send the SL PRS.

[0193] In some embodiments, the time-domain position of a PSSCH DMRS within a time slot is determined based on a pattern of at least one PSSCH DMRS preconfigured or configured by the network within a resource pool; in the pattern of at least one PSSCH DMRS preconfigured or configured by the network, there are N symbols that do not contain a PSCCH between the symbols where the first and second PSSCH DMRS are located, where N is a preconfigured or network-configured integer greater than or equal to 0.

[0194] For example, assuming that K (K is a positive integer) PSSCH DMRS patterns are configured in the resource pool or by the network, then at least one of these K patterns must satisfy the following characteristic: N symbols that do not contain PSCCH exist between the symbols where the first and second PSSCH DMRS in the pattern are located. In other words, for the at least one PSSCH DMRS pattern pre-configured in the resource pool or configured by the network, the N symbols that do not contain PSCCH cannot be included after the first PSSCH DMRS.

[0195] In some embodiments, the N symbols not containing PSCCH do not overlap with the symbols used to send SL PRS, or in other words, the N symbols not containing PSCCH do not include the symbols used to send SL PRS. The N symbols not containing PSCCH can be used for mapping the second-order SCI, so that relatively sufficient positions can be reserved for the second-order SCI, thereby facilitating the avoidance of overlap between the second-order SCI and the symbols used to send SL PRS, thereby avoiding collision between the second-order SCI and SL PRS resources.

[0196] S1102: Map a portion of the PSSCH that does not include the second-order SCI to at least one third resource unit that does not include the second-order SCI.

[0197] The portion of the PSSCH that does not include the second-order SCI may also be understood as other complex-valued modulation symbols in the PSSCH except the complex-valued modulation symbols of the second-order SCI. Mapping the portion of the PSSCH that does not include the second-order SCI to at least one (i.e., one or more) third resource units that do not include the second-order SCI may also be understood as mapping other complex-valued modulation symbols in the PSSCH except the complex-valued modulation symbols of the second-order SCI to at least one third resource unit that does not include the second-order SCI.

[0198] In some embodiments, the third resource unit does not overlap with the symbol used to transmit the SL PRS. That is, when mapping the portion of the PSSCH that does not include the second-order SCI, the terminal cannot occupy the symbol used to transmit the SL PRS.

[0199] In some embodiments, when mapping the portion of the PSSCH that does not contain the second-order SCI, if a symbol contains both the mapped second-order SCI and the SL PRS, the terminal can use the portion of the PSSCH that does not contain the second-order SCI to cover the mapped SL PRS in the symbol. In other words, the portion of the PSSCH that does not contain the second-order SCI can be mapped to a symbol that has been mapped with the second-order SCI and SL PRS. In this case, the portion of the PSSCH that does not contain the second-order SCI can cover the mapped SL PRS in the symbol, thereby avoiding the impact of the second-order SCI on the SL PRS.

[0200] In some embodiments, the third resource unit is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS, or PT-RS. That is, in the process of mapping the portion of the PSSCH that does not contain the second-order SCI to the third resource unit, it is also necessary to meet the following requirements: the third resource unit is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS, or PT-RS.

[0201] In some embodiments, the time slot further includes a first-order SCI, wherein the first-order SCI and / or the second-order SCI includes a bit field for indicating the format of the second-order SCI.

[0202] In one example, the terminal may indicate the format of the second-stage SCI in the embodiment of the present application through the "2nd-stage SCI format" field in the first-stage SCI. For example, the terminal may set the "2nd-stage SCI format" field in the first-stage SCI to "11" to indicate the format of the second-stage SCI in the embodiment of the present application (for example, recorded as SCI format 2-D).

[0203] In another example, the terminal may indicate the format of the second-order SCI in the embodiment of the present application through the reserved field (Reserved) in the first-order SCI. For example, the terminal may set a specific bit in the reserved field in the first-order SCI to "1" to indicate the format of the second-order SCI in the embodiment of the present application.

[0204] In another example, the terminal may jointly indicate the format of the second-order SCI in the embodiment of the present application through the bit fields in the first-order SCI and the second-order SCI. In this case, the bit field in the second-order SCI used to indicate the format of the second-order SCI may include, for example, the last bit field in the second-order SCI.

[0205] For example, the terminal may set the "2nd-stage SCI format" field in the first-stage SCI to "10" (indicating that the format of the second-stage SCI is SCI format 2-C). Furthermore, the terminal may set the "Providing / Requesting indicator" field in the transmitted second-stage SCI to "1" and set a specific bit in the last bit field (Padding bits) to "1" to indicate that the format of the second-stage SCI is SCI format 2-D.

[0206] As described above, an embodiment of the present application provides a resource mapping method for PSSCH in sideline positioning. According to this method, when SL PRS and sideline communication are sent in a shared resource pool, effective reception of PSSCH can be guaranteed and the impact on backward terminal resource selection can be minimized.

[0207] The above describes a resource mapping method provided by an embodiment of the present application in conjunction with Figures 11 to 15. To facilitate understanding of the embodiment of the present application, several possible implementation solutions of the resource mapping method applicable to the embodiment of the present application are described below.

[0208] It should be noted that the "first symbol" referred to below refers to the first symbol in the time slot that does not include AGC (such as symbol #2 in Figures 12, 13, and 14). In the mapping operation described in the embodiment of the present application, the resource elements used for PSSCH, PSCCH, PSCCH DMRS, PSSCH DMRS, or PT-RS in the first symbol in the time slot should be copied to the symbol before the first symbol, that is, the symbol used for AGC (such as symbol #1 in Figures 12, 13, and 14).

[0209] It should also be noted that the format of the second-order SCI sent in the same time slot as the SL PRS in the embodiment of the present application is different from the SCI formats 2-A, 2-B and 2-C defined before the 3GPP version Rel-18. In the following description, this new second-order SCI format is referred to as SCI format 2-D.

[0210] As an example, the embodiments of the present application may include the following resource mapping implementation solutions:

[0211] Option 1

[0212] In scheme one, the starting point S of the OFDM symbol used for SL PRS transmission in the resource pool (i.e., the starting symbol position S of the symbol used for sending SL PRS in the aforementioned embodiment), and the corresponding number of consecutive OFDM symbols M (i.e., the number of symbols used for sending SL PRS in the aforementioned embodiment M) can be network configured (hereinafter referred to as configuration) or pre-configured; the second-order SCI in the PSSCH can be mapped to the OFDM symbol without SL PRS configured, starting from the first PSSCH DMRS in the time slot; the part of the PSSCH that does not contain the second-order SCI can be mapped to resources not occupied by SL PRS and the second-order SCI.

[0213] In some embodiments, the starting point of the OFDM symbols that can be used for SL PRS transmission in a time slot within the resource pool is configured or preconfigured, and one or more starting points S of OFDM symbols that can be used for SL PRS transmission can be configured / preconfigured in a time slot. For each starting point S, the number M of consecutive OFDM symbols used for SL PRS transmission is correspondingly configured / preconfigured. In some embodiments, any configured / preconfigured starting point S and the corresponding M OFDM symbols cannot include OFDM symbols that can be used for PSCCH transmission in the current time slot.

[0214] An example is shown in FIG15 , where two OFDM symbol starting points that can be used for SL PRS transmission are configured in the time slot, namely OFDM symbol #6 and OFDM symbol #11, and the corresponding number M of consecutive OFDM symbols used for SL PRS transmission is 4 and 2 respectively.

[0215] In solution 1, the UE may determine (select) the starting point for SL PRS transmission and the corresponding number of consecutive OFDM symbols from the starting point S of the OFDM symbols that can be used for SL PRS transmission and the corresponding number of consecutive OFDM symbols M configured / preconfigured in the resource pool, for example, according to one of the following determination methods:

[0216] Determination method 1-1: The MAC layer of the UE first determines the sidelink grant. For example, the UE may obtain the sidelink grant by receiving indication information from the base station or by autonomous resource selection. The sidelink grant is used for at least transmitting the PSSCH.

[0217] For each PSSCH and / or SL PRS transmission opportunity, if there is a sidelink grant, the UE MAC layer may select the starting point S and the corresponding number of OFDM symbols M for SL PRS transmission from the PSSCH and / or SL PRS transmission opportunities with the sidelink grant. For example, for PSSCH and / or SL PRS transmission opportunities with the sidelink grant, the UE MAC layer may determine the starting point S and the corresponding number of OFDM symbols M for SL PRS transmission from one or more starting points S and the corresponding number of OFDM symbols M configured / preconfigured in the resource pool.

[0218] In some embodiments, the OFDM symbols selected by the MAC layer for SL PRS transmission should not overlap with the OFDM symbols that may be used for second-order SCI transmission, or in other words, the OFDM symbols selected by the MAC layer for SL PRS transmission do not include OFDM symbols that may be used for sending second-order SCI.

[0219] Determination method 1-2: The MAC layer of the UE first determines the sidelink authorization. Exemplarily, the UE can obtain the sidelink authorization by receiving indication information from the base station, or can obtain the sidelink authorization by autonomous resource selection, and the sidelink authorization is at least used for PSSCH transmission. Subsequently, the UE MAC layer can send (indicate) the determined sidelink authorization to the UE physical layer, so that the UE physical layer can determine the starting point S of the OFDM symbol for SL PRS transmission and the corresponding number of OFDM symbols M according to the configuration / pre-configuration in the resource pool. For example, for PSSCH and / or SL PRS transmission opportunities with sidelink authorization, the UE physical layer can determine the starting point S and the corresponding number of OFDM symbols M for SL PRS transmission from one or more starting points S and the corresponding number of OFDM symbols M configured / pre-configured in the resource pool.

[0220] Determination method 1-3: The MAC layer of the UE first determines the sidelink authorization. Exemplarily, the UE may obtain the sidelink authorization by receiving indication information from the base station, or may obtain the sidelink authorization by autonomous resource selection, and the sidelink authorization is at least used for PSSCH transmission. Subsequently, the UE MAC layer may send (indicate) the determined sidelink authorization to the UE physical layer, and at the same time indicate to the physical layer the minimum number of OFDM symbols for SL PRS transmission (for example, recorded as the first symbol number), so that the UE physical layer may determine the starting point S of the OFDM symbol for SL PRS transmission and the corresponding number of OFDM symbols M according to the configuration / pre-configuration in the resource pool and the first symbol number. For example, for PSSCH and / or SL PRS transmission opportunities with sidelink authorization, the UE physical layer may determine the starting point S and the corresponding number of OFDM symbols M for SL PRS transmission from one or more starting points S and the corresponding number of OFDM symbols M configured / pre-configured in the resource pool, and the determined number of OFDM symbols is not less than the first symbol number indicated by the MAC layer.

[0221] It should be noted that, in some scenarios, the first number of symbols may also be determined by other higher layers of the UE. For example, the first number of symbols may be determined by the UE SLPP layer and indicated to the UE physical layer.

[0222] Determination method 1-4: Other higher layers of the UE (such as the SLPP layer) determine the starting point S and the corresponding number of OFDM symbols M for SL PRS transmission from one or more starting points S and the corresponding number of OFDM symbols M configured / preconfigured in the resource pool, and indicate them to the physical layer.

[0223] In some embodiments, after the UE determines the starting point S and the corresponding number of consecutive OFDM symbols M for SL PRS transmission (that is, after determining the OFDM symbols for SL PRS transmission), the UE can map the SL PRS to the determined OFDM symbols for SL PRS transmission.

[0224] In solution 1, the UE may map the PSSCH (the complex-valued modulation symbols of the PSSCH) to the REs of the virtual resource block according to one of the following mapping schemes:

[0225] Mapping method 1-1: The UE can map the complex-valued modulation symbols of the second-order SCI in the PSSCH to one or more consecutive OFDM symbols, starting from the OFDM symbol where the first PSSCH DMRS is located in the time slot, and then map other complex-valued modulation symbols of the PSSCH (that is, complex-valued modulation symbols other than the complex-valued modulation symbols of the second-order SCI).

[0226] Exemplarily, the UE may first map the complex-valued modulation symbols of the second-order SCI in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, and in sequence in order of increasing index to the REs of the virtual resource blocks allocated by the sidelink authorization, and satisfy that the mapped REs are not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0227] In some embodiments, the UE may, for example, adopt the following method A and / or method B, so that the second-order SCI can be finally mapped to the OFDM symbol without SL PRS configured, or in other words, the resources mapped to the second-order SCI do not overlap with the OFDM symbol determined by the UE for SL PRS transmission (no resource collision occurs).

[0228] Method A: Ensure that the second-order SCI complex-valued modulation symbols do not occupy the OFDM symbols determined by the UE for SL PRS transmission through the second-order SCI rate matching. For example, in the second-order SCI rate matching process, the UE selects the second-order SCI rate offset This ensures that the complex-valued modulation symbols of the second-order SCI cannot ultimately occupy the OFDM symbols determined by the UE for SL PRS transmission.

[0229] Method B: During resource mapping according to mapping method 1-1, X complex-valued modulation symbols of the second-order SCI may be mapped to the OFDM network selected by the UE for SL PRS transmission. In this case, the UE may discard the X complex-valued modulation symbols of the second-order SCI, thereby avoiding the impact on the SL PRS and simplifying the rate matching of the second-order SCI.

[0230] Through the above-mentioned method A and / or method B, the collision between the second-order SCI and SL PRS resources can be effectively reduced.

[0231] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0232] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved mapping manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0233] Taking Figure 12 as an example, in mapping mode 1-1, the UE may map the complex-valued modulation symbols of the second-order SCI in the PSSCH, starting from the OFDM symbol (OFDM symbol #4) where the first PSSCH DMRS is located in the time slot, to one or more consecutive OFDM symbols including OFDM symbol #4, such as OFDM symbol #4 and OFDM symbol #5. Subsequently, the UE may map the remaining complex-valued modulation symbols of the PSSCH (i.e., the portion of the PSSCH that does not contain the second-order SCI) to the remaining resources, starting from the first OFDM symbol (OFDM symbol #1) in the time slot.

[0234] Mapping mode 1-2: The UE may map the complex-valued modulation symbols of the second-order SCI in the PSSCH starting from the OFDM symbol where the first PSSCH DMRS is located in the time slot, and preferentially map them to the OFDM symbols where the PSSCH DMRS and / or PSCCH are located, and then map other complex-valued modulation symbols of the PSSCH.

[0235] As an implementation method, the UE may first map the complex-valued modulation symbols of the second-order SCI in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, and in sequence in order of increasing index to the REs of the virtual resource blocks allocated by the sidelink authorization, and satisfying that PSSCH DMRS exists on the mapped OFDM symbol and the mapped RE is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0236] If there are any remaining complex-valued modulation symbols of the second-order SCI after mapping in the above manner, the remaining complex-valued modulation symbols of the second-order SCI can be mapped to the REs of the virtual resource blocks allocated by the sideline authorization in the order of frequency domain first and time domain later, starting from the first OFDM symbol with PSCCH in the time slot, in ascending order of index, and satisfying that PSCCH exists on the mapped OFDM symbol and the mapped RE is not occupied by the mapped second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0237] If after mapping in the above manner, there are still remaining complex-valued modulation symbols of the second-order SCI, the UE can map the remaining complex-valued modulation symbols of the second-order SCI in the order of frequency domain first and time domain later, starting from the first OFDM, in ascending order of index to the REs of the virtual resource blocks allocated by the sidelink authorization, and satisfy that the mapped REs are not occupied by the mapped second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0238] In some embodiments, the UE may, for example, adopt the following method A and / or method B, so that the second-order SCI can be finally mapped to the OFDM symbol without SL PRS configured, or in other words, the resources mapped to the second-order SCI do not overlap with the OFDM symbol determined by the UE for SL PRS transmission (no resource collision occurs).

[0239] Method A: Ensure that the second-order SCI complex-valued modulation symbols do not occupy the OFDM symbols determined by the UE for SL PRS transmission through the second-order SCI rate matching. For example, in the second-order SCI rate matching process, the UE selects the second-order SCI rate offset This ensures that the complex-valued modulation symbols of the second-order SCI cannot ultimately occupy the OFDM symbols determined by the UE for SL PRS transmission.

[0240] Method B: During resource mapping according to mapping methods 1-2, it is possible that X second-order SCI complex-valued modulation symbols may be mapped to the OFDM selected by the UE for SL PRS transmission. In this case, the UE may discard the X second-order SCI complex-valued modulation symbols to avoid affecting the SL PRS and simplify the rate matching of the second-order SCI.

[0241] Through the above-mentioned method A and / or method B, the collision between the second-order SCI and SL PRS resources can be effectively reduced.

[0242] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0243] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0244] Taking Figure 13 as an example, in mapping mode 1-2, the UE can map the complex-valued modulation symbols of the second-order SCI in the PSSCH starting from the OFDM symbol (OFDM symbol #4) where the first PSSCH DMRS in the time slot is located to the OFDM symbols (OFDM symbol #4 and OFDM symbol #10) where the PSSCH DMRS exists. If there are any remaining complex-valued modulation symbols of the second-order SCI after mapping in the above manner, the remaining complex-valued modulation symbols of the second-order SCI can be mapped to the OFDM symbols (OFDM symbols #1, 2, and 3) where the PSCCH exists. If there are still any remaining complex-valued modulation symbols of the second-order SCI after mapping in the above manner, the remaining complex-valued modulation symbols of the second-order SCI can be mapped to unoccupied resources starting from the first OFDM. Subsequently, the UE can map the other complex-valued modulation symbols of the PSSCH to the remaining resources.

[0245] For mapping mode 1-1, since the resource mapping method of the second-order SCI is the same as the second-order SCI resource mapping method before 3GPP version Rel-18, in the first-order SCI sent together with the second-order SCI (that is, sent in the same time slot), the format of the second-order SCI can be indicated as a second-order SCI format that existed before 3GPP version Rel-18, and then one or more specific bits in the format 2-D of the sent second-order SCI are set to 1 to indicate the format of the sent second-order SCI to the receiving UE.

[0246] As an example, the UE may set the "2nd-stage SCI format" field in the first-stage SCI transmitted together with the second-stage SCI to "10" (indicating that the format of the second-stage SCI is SCI format 2-C). In this case, the total number of bits of the second-stage SCI format 2-D transmitted is the same as that of the SCI format 2-C. Then, the positions, number of bits, and bit field values ​​of certain specific fields of the SCI format 2-D may be determined as follows:

[0247] The first bit field is "HARQ process number", 4 bits, and the value of this bit field is set in the same way as SCI format 2-C.

[0248] The second bit field, "New data indicator", is 1 bit. The value of this bit field is set in the same way as SCI format 2-C.

[0249] The third bit field, "Redundancy version", is 2 bits. The value of this bit field is set in the same manner as in SCI format 2-C.

[0250] The fourth bit field, "Source ID", is 8 bits. The value of this bit field is set in the same way as SCI format 2-C.

[0251] The fifth bit field, "Destination ID", is 16 bits. The value of this bit field is set in the same manner as SCI format 2-C.

[0252] The sixth bit field, "HARQ feedback enabled / disabled indicator", is 1 bit. The value of this bit field is set in the same manner as SCI format 2-C.

[0253] The seventh bit field, "CSI request", is 1 bit. The value of this bit field is set in the same manner as in SCI format 2-C.

[0254] The 8th bit field, "Providing / Requesting indicator", is 1 bit, and the value of this bit field is set to "1".

[0255] The last bit field, “Padding bits”, has a specific bit set to “1” and the remaining bits set to “0”.

[0256] In this embodiment, the UE may set the "2nd-stage SCI format" field in the first-stage SCI sent together with the second-stage SCI to "10", and set the "Providing / Requesting indicator" field in the second-stage SCI sent to "1", and at the same time set a specific bit in the padding field (Padding bits) to "1", so that the format of the second-stage SCI (SCI format 2-D) can be jointly indicated by the first-stage SCI and the second-stage SCI.

[0257] For mapping mode 1-2, since the resource mapping method of the second-stage SCI is different from that of the second-stage SCI resource mapping method before 3GPP version Rel-18, it is necessary to explicitly indicate the format of the second-stage SCI to be sent through a specific field in the first-stage SCI sent together with the second-stage SCI. For example, the "2nd-stage SCI format" field in the first-stage SCI sent together with the second-stage SCI can be set to "11" (indicating that the format of the second-stage SCI is SCI format 2-D), or a specific bit in the reserved field (Reserved) in the first-stage SCI sent together with the second-stage SCI can be set to "1" to indicate that the format of the second-stage SCI to be sent is SCI format 2-D.

[0258] It should be noted that the indication method of the second-order SCI format of mapping method 1-2 can also be applied to mapping method 1-1.

[0259] According to the method of this embodiment, the second-order SCI in the PSSCH can be mapped to OFDM symbols without SL PRS, thereby effectively reducing the collision between the second-order SCI and SL PRS resources. In addition, for mapping methods 1-2, since the complex-valued modulation symbols of the second-order SCI can be preferentially mapped to OFDM symbols with PSSCH DMRS, the decoding performance of the second-order SCI and the measurement accuracy related to positioning can be improved.

[0260] Option 2

[0261] In Solution 2, the starting point S of the OFDM symbols used for SL PRS transmission within the resource pool, and the corresponding number M of consecutive OFDM symbols, can be configured or pre-configured. In some embodiments, the SL PRS cannot be configured on OFDM symbols that may be used for second-order SCI; and / or the second-order SCI in the PSSCH can be punctured with the SL PRS, or the second-order SCI can be truncated; the portion of the PSSCH that does not contain the second-order SCI can be mapped to the remaining resources.

[0262] In some embodiments, the starting point of the OFDM symbols that can be used for SL PRS transmission in a time slot within the resource pool is configured or preconfigured, and one or more starting points S of OFDM symbols that can be used for SL PRS transmission can be configured / preconfigured in a time slot. For each starting point S, the number M of consecutive OFDM symbols used for SL PRS transmission is correspondingly configured / preconfigured. In some embodiments, any configured / preconfigured starting point S and the corresponding M OFDM symbols cannot include OFDM symbols that can be used for PSCCH transmission in the current time slot.

[0263] In some embodiments, at least one PSSCH DMRS pattern configured / preconfigured within a resource pool cannot include N OFDM symbols that do not contain a PSCCH after the first PSSCH DMRS. In other words, in the at least one PSSCH DMRS pattern configured / preconfigured within the resource pool, N OFDM symbols that do not contain a PSCCH exist between the OFDM symbols where the first and second PSSCH DMRS are located. N is a specific value greater than or equal to 0, which may be defined by a standard or configured or preconfigured by the network. For example, N may be configured or preconfigured by the network to be 1.

[0264] In some embodiments, the N OFDM symbols that do not contain PSCCH after the first PSSCH DMRS do not overlap with the OFDM symbols used for SL PRS transmission.

[0265] In some embodiments, the N OFDM symbols that do not contain PSCCH after the first PSSCH DMRS can be used for mapping the second-order SCI, so that relatively sufficient space can be reserved for the second-order SCI, thereby helping to reduce the impact on the rate matching of the second-order SCI.

[0266] In Solution 2, the UE determines (selects) the starting point S of the OFDM symbols used for SL PRS transmission and the corresponding number of consecutive OFDM symbols from the starting point S of the OFDM symbols used for SL PRS transmission and the corresponding number of consecutive OFDM symbols M configured / pre-configured in the resource pool. The method can be referred to the description in Solution 1 and will not be repeated here.

[0267] In solution 2, the UE may map the PSSCH (the complex-valued modulation symbols of the PSSCH) to the REs of the virtual resource block in one of the following ways, for example:

[0268] Mapping method 2-1: The UE can map the complex-valued modulation symbols of the second-order SCI in the PSSCH to one or more consecutive OFDM symbols, starting from the OFDM symbol where the first PSSCH DMRS is located in the time slot, and then map other complex-valued modulation symbols of the PSSCH (i.e., complex-valued modulation symbols other than the complex-valued modulation symbols of the second-order SCI).

[0269] Exemplarily, the UE may first map the complex-valued modulation symbols of the second-order SCI in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, and in sequence in order of increasing index to the REs of the virtual resource blocks allocated by the sidelink authorization, and satisfy that the mapped REs are not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0270] In some embodiments, the UE should ensure that the complex-valued modulation symbols of the second-order SCI cannot eventually occupy the OFDM symbols determined by the UE for SL PRS transmission. For example, the UE can select a suitable OFDM symbol for SL PRS transmission and adjust the second-order SCI code rate offset in the rate matching of the second-order SCI. In other ways, it is ensured that the complex-valued modulation symbols of the second-order SCI cannot eventually occupy the OFDM symbols determined by the UE for SL PRS transmission. In this way, the collision between the second-order SCI and SL PRS resources can be effectively reduced.

[0271] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0272] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0273] Mapping method 2-2: The UE may map the SL PRS to the OFDM symbol selected for SL PRS transmission; then, the UE may map the complex-valued modulation symbols of the second-order SCI to one or more consecutive OFDM symbols, starting from the OFDM symbol where the first PSSCH DMRS is located. During this process, if the complex-valued modulation symbols of the second-order SCI are mapped to the OFDM symbol used for the SL PRS, the second-order SCI may puncture the SL PRS or truncate the second-order SCI before mapping other complex-valued modulation symbols of the PSSCH.

[0274] For example, the UE may first map the SL PRS to the OFDM symbol selected by the UE for SL PRS transmission. After the SL PRS mapping is completed, the UE may map the complex-valued modulation symbols of the second-order SCI in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, and in ascending order of index to the REs of the virtual resource blocks allocated by the sidelink authorization, and satisfy that the mapped REs are not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0275] If, during the mapping of the complex-valued modulation symbols of the second-order SCI, the second-order SCI is mapped to the OFDM symbol selected by the UE for SL PRS transmission, or in other words, if the second-order SCI is about to overlap with the OFDM symbol used for SL PRS transmission, the following method 2-2-1 or method 2-2-2 can be used for processing:

[0276] Method 2-2-1: In order to simplify the mapping method of the second-order SCI, the UE may continue to map the remaining complex-valued modulation symbols of the second-order SCI in the above manner. On the OFDM symbol used for SL PRS transmission, the UE may use the complex-valued modulation symbols of the second-order SCI to cover the mapped SL PRS. In other words, when the second-order SCI overlaps with the OFDM symbol used for SL PRS transmission, the UE may use the complex-valued modulation symbols of the second-order SCI to cover the mapped SL PRS, as shown in OFDM symbol #6 in Figure 14.

[0277] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sidelink authorization in ascending order, starting from the first OFMD symbol in the time slot, and satisfying that the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0278] In some embodiments, in order to avoid affecting the SL PRS, other complex-valued modulation symbols of the PSSCH cannot be mapped to OFDM symbols that only have the SL PRS, but other complex-valued modulation symbols of the PSSCH can be mapped to OFDM symbols that have been mapped with complex-valued modulation symbols of the second-order SCI and have been mapped with the SL PRS. In this case, the other complex-valued modulation symbols of the PSSCH can cover the mapped SL PRS in the OFDM symbol, as shown in OFDM symbol #6 in Figure 14.

[0279] Method 2-2-2: To simplify the mapping of the second-order SCI and reduce the impact on the SL PRS, the UE should stop mapping the complex-valued modulation symbols of the second-order SCI. In other words, when the second-order SCI is about to overlap with the OFDM symbol used for SL PRS transmission, the UE should truncate the second-order SCI to avoid collision between the second-order SCI and the SL PRS resources.

[0280] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0281] The above-mentioned method 2-2-1 / method 2-2-2 can solve the problem of how to deal with the overlap between the second-order SCI and the OFDM symbol used for SL PRS transmission.

[0282] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0283] For mapping mode 2-1 and mode 2-2-1, since the resource mapping mode of the second-order SCI is the same as the second-order SCI resource mapping mode before 3GPP version Rel-18, the format of the second-order SCI can be indicated as a second-order SCI format before 3GPP version Rel-18 in the first-order SCI sent together with the second-order SCI. Then, one or more specific bits in format 2-D of the sent second-order SCI are set to 1 to indicate the format of the sent second-order SCI to the receiving UE. For this part, please refer to the relevant description of mapping mode 1-1 in solution 1 and will not be repeated here.

[0284] For method 2-2-2, because the resource mapping method for the second-order SCI differs from that used in 3GPP versions prior to Rel-18, a specific field in the first-order SCI sent along with the second-order SCI must explicitly indicate the format of the second-order SCI being sent. For details on this, refer to the description of mapping method 1-2 in solution 1 and will not be repeated here.

[0285] According to the method of this embodiment, the UE can minimize the impact on the second-order SCI rate matching and resource mapping.

[0286] Option 3

[0287] In scheme three, the UE can first map the second-order SCI in the PSSCH, then determine (select) the OFDM symbol used for sending the SL PRS, and map the SL PRS to the selected OFDM symbol, and finally map the part of the PSSCH that does not contain the second-order SCI (that is, the complex-valued modulation symbols other than the complex-valued modulation symbols of the second-order SCI).

[0288] Exemplarily, the UE may map the PSSCH (complex-valued modulation symbols of the PSSCH) and the SL PRS to REs of the virtual resource block according to the following mapping manner:

[0289] The UE may first map the complex-valued modulation symbols of the second-order SCI to the REs of the virtual resource blocks allocated by the sidelink grant in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, in ascending order of index, and satisfying that the mapped REs are not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0290] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can determine (select) the OFDM symbols for SL PRS transmission and map the SL PRS to the selected M consecutive OFDM symbols for SL PRS transmission.

[0291] In solution 3, the UE may determine (select) the OFDM symbol for SL PRS transmission according to one of the following determination methods:

[0292] Determination method 3-1: The UE MAC layer determines the values ​​of S and M.

[0293] The MAC layer of the UE first determines the sidelink grant. For example, the UE may obtain the sidelink grant by receiving indication information from the base station, or by autonomous resource selection. The sidelink grant is at least used for transmitting the PSSCH.

[0294] For each PSSCH and / or SL PRS transmission opportunity, if there is a sidelink grant, the UE MAC layer may determine the starting point S of the OFDM symbol used for SL PRS transmission and the corresponding number of OFDM symbols M in the PSSCH and / or SL PRS transmission opportunity in which the sidelink grant exists. The OFDM symbols for SL PRS transmission determined by the UE MAC layer must satisfy the following: there is no PSSCH DMRS, second-order SCI, PSCCH, or PSCCH DMRS on the determined M consecutive OFDM symbols. In some embodiments, the UE MAC layer may carry the determined starting point S and the corresponding M in the sidelink grant and indicate the sidelink grant to the UE physical layer.

[0295] Determination method 3-2: The UE physical layer determines the values ​​of S and M.

[0296] Exemplarily, the UE may obtain a sidelink authorization by receiving indication information from the base station, or may obtain a sidelink authorization by autonomous resource selection, and the sidelink authorization is at least used for PSSCH transmission. Subsequently, the UE MAC layer may send (indicate) the determined sidelink authorization to the UE physical layer. Thus, the UE physical layer may determine the starting point S and the corresponding number M of OFDM symbols for SL PRS transmission based on the sidelink authorization, and the OFDM symbols for SL PRS transmission determined by the UE physical layer must satisfy: there is no PSSCH DMRS, second-order SCI, PSCCH or PSCCH DMRS on the determined M consecutive OFDM symbols.

[0297] Determination method 3-3: The UE physical layer determines the values ​​of S and M based on the first number of symbols.

[0298] The first number of symbols is the minimum number of OFDM symbols used for SL PRS transmission determined by the upper layer of the UE (such as the UE MAC layer; such as the UE SLPP layer).

[0299] In one possible manner, the first number of symbols is determined by the UE MAC layer. In this case, the UE MAC layer may send (indicate) the determined sidelink grant to the UE physical layer and indicate the first number of symbols to the UE physical layer. Thus, the UE physical layer may determine the starting point S of the OFDM symbol for SL PRS transmission and the corresponding number of OFDM symbols M based on the sidelink grant and the first number of symbols. Among them, the OFDM symbol for SL PRS transmission determined by the UE physical layer must meet the following requirements: the determined value of M is not less than the first number of symbols indicated by the MAC layer, and there is no PSSCH DMRS, second-order SCI, PSCCH or PSCCH DMRS on the determined M consecutive OFDM symbols.

[0300] In another possible manner, the first number of symbols is determined by the SLPP layer. In this case, the SLPP layer may indicate the determined first number of symbols to the UE physical layer. Thus, the UE physical layer may determine the starting point S of the OFDM symbol used for SL PRS transmission and the corresponding number of OFDM symbols M based on the first number of symbols. For example, after obtaining the sideline authorization from the UE MAC layer, the UE physical layer may determine the starting point S of the OFDM symbol used for SL PRS transmission and the corresponding number of OFDM symbols M based on the sideline authorization and the first number of symbols. Among them, the OFDM symbol determined by the UE physical layer for SL PRS transmission must meet the following requirements: the determined value of M is not less than the first number of symbols indicated by the SLPP layer, and there is no PSSCH DMRS, second-order SCI, PSCCH or PSCCH DMRS on the determined M consecutive OFDM symbols.

[0301] For example, before the UE MAC layer sends (indicates) the sidelink grant to the UE physical layer, the UE may obtain the sidelink grant in one of the following ways: 1) obtaining the sidelink grant by receiving indication information from the base station; or 2) obtaining the sidelink grant through autonomous resource selection. The sidelink grant is used at least for PSSCH transmission.

[0302] Determination method 3-4: The OFDM symbols used for SL PRS transmission are determined by other higher layers of the UE (such as the UE SLPP layer). The OFDM symbols used for SL PRS transmission determined by other higher layers of the UE (such as the SLPP layer) must meet the following requirements: no PSSCH DMRS, second-order SCI, PSCCH, or PSCCH DMRS exist on the determined M consecutive OFDM symbols. In some embodiments, the UE SLPP layer may further indicate the determined OFDM symbols used for SL PRS transmission to the physical layer.

[0303] After completing the mapping of SL PRS, the UE can map other complex-valued modulation symbols of PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0304] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0305] According to the method of this embodiment, since the OFDM symbols used for SL PRS transmission are determined after mapping the second-order SCI, the complexity of second-order SCI resource mapping can be reduced, while the flexibility of SL PRS resource selection is increased. In addition, since the UE avoids the mapped second-order SCI when determining the OFDM symbols for SL PRS transmission, collisions between the second-order SCI and SL PRS resources can be avoided.

[0306] Option 4

[0307] In solution 4, the OFDM symbols used for SL PRS transmission are independent of the OFDM symbols used for second-order SCI. For example, the UE may first determine the OFDM symbols used for SL PRS transmission, map the SL PRS to the determined OFDM symbols used for SL PRS transmission, and then map the second-order SCI and PSSCH starting from the first PSSCH DMRS.

[0308] In solution 4, the UE may determine the OFDM symbol used for SL PRS transmission in one of the following ways:

[0309] Determination method 4-1: Same as determination method 1-1.

[0310] Determination method 4-2: The UE MAC layer may send (indicate) the determined sidelink grant to the UE physical layer, so that the UE physical layer may select OFDM symbols for SL PRS transmission from the time-frequency resources indicated by the sidelink grant. In some embodiments, the OFDM symbols determined by the UE physical layer for SL PRS transmission must satisfy the following: no PSSCH DMRS, PSCCH, or PSCCH DMRS exists on the determined M consecutive OFDM symbols.

[0311] Determination method 4-3: The UE MAC layer may send (indicate) the determined sidelink grant to the UE physical layer and indicate to the UE physical layer the number M of consecutive OFDM symbols used for SL PRS transmission. Furthermore, the UE physical layer may determine the positions of the M consecutive OFDM symbols, or in other words, determine the starting point S for SL PRS transmission based on the sidelink grant sent by the UE MAC layer and the value of M.

[0312] For example, before the UE MAC layer sends (indicates) the sidelink grant to the UE physical layer, the UE may obtain the sidelink grant in one of the following ways: 1) obtaining the sidelink grant by receiving indication information from the base station; or 2) obtaining the sidelink grant through autonomous resource selection. The sidelink grant is used at least for PSSCH transmission.

[0313] Determination method 4-4: The UE SLPP layer may indicate to the UE physical layer the number of consecutive OFDM symbols M for SL PRS transmission. Furthermore, the UE physical layer may determine the positions of the M consecutive OFDM symbols, or in other words, determine the starting point S for SL PRS transmission, based on the value of M indicated by the UE SLPP layer.

[0314] In some embodiments, the value of M determined by the UE MAC layer should be less than or equal to the number of consecutive OFDM symbols in the current time slot that do not contain PSSCH DMRS and PSCCH. In some embodiments, the OFDM symbols determined by the UE physical layer for SL PRS transmission must satisfy the following conditions: no PSSCH DMRS, PSCCH, or PSCCH DMRS exists on the determined M consecutive OFDM symbols.

[0315] In solution 4, the UE may map the PSSCH (complex-valued modulation symbols of the PSSCH) and the SL PRS to the REs of the virtual resource block according to the following mapping method, for example:

[0316] Exemplarily, the UE may first map the SL PRS to the M consecutive OFDM symbols selected for SL PRS transmission. Subsequently, the UE may map the complex-valued modulation symbols of the second-order SCI to the REs of the virtual resource blocks allocated by the sideline authorization in the order of frequency domain first and time domain later, starting from the first OFDM with PSSCH DMRS in the time slot, in ascending order of index. As an implementation method, the complex-valued modulation symbols of the second-order SCI cannot be mapped to the OFDM symbol with SL PRS, and the mapped RE is not occupied by PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0317] After completing the mapping of the complex-valued modulation symbols of the second-order SCI, the UE can map the other complex-valued modulation symbols of the PSSCH to the REs of the virtual resource blocks allocated by the sideline authorization in ascending order, starting from the first OFDM symbol in the time slot, and satisfying that the mapped OFDM symbols are not selected by the UE for SL PRS transmission, and the REs are not occupied by the second-order SCI, PSSCH DMRS, PSCCH, PSCCH DMRS or PT-RS.

[0318] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0319] Plan 5

[0320] In scheme five, the UE may first determine the OFDM symbol used for SL PRS transmission and map the SL PRS to the determined OFDM symbol. Subsequently, the second-order SCI in the PSSCH and the portion of the PSSCH that does not contain the second-order SCI may be mapped starting from the first PSSCH DMRS. As an implementation method, the second-order SCI may puncture the OFDM symbol where the SL PRS is located, or the redundant second-order SCI may be truncated (discarded), and the PSSCH may occupy the remaining resources on the OFDM symbol where the second-order SCI exists (even if the OFDM symbol is used for SL PRS).

[0321] Exemplarily, the UE may determine the OFDM symbol used for SL PRS transmission according to determination method 4-1, determination method 4-2, determination method 4-3 or determination method 4-4.

[0322] In solution 5, the UE may map the PSSCH (complex-valued modulation symbols of the PSSCH) and the SL PRS to the REs of the virtual resource block according to the following mapping method, for example:

[0323] The UE first maps the SL PRS to the M consecutive OFDM symbols selected for SL PRS transmission. Subsequently, the UE may map the complex-valued modulation symbols of the second-order SCI in the PSSCH and the portion of the PSSCH that does not contain the second-order SCI (i.e., the complex-valued modulation symbols in the PSSCH other than the complex-valued modulation symbols of the second-order SCI) according to mapping mode 2-2.

[0324] Furthermore, the UE may map virtual resource blocks to physical resource blocks in a non-interleaved manner, that is, virtual resource block n is mapped to physical resource block n, where n represents the index of the virtual resource block or the physical resource block.

[0325] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all fall within the scope of protection of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will no longer describe the various possible combinations separately. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the idea of ​​the present application, they should also be regarded as the contents disclosed in the present application. For another example, under the premise of no conflict, the various embodiments and / or the technical features in each embodiment described in the present application can be arbitrarily combined with the prior art, and the technical solution obtained after the combination should also fall within the scope of protection of the present application.

[0326] It should also be understood that in the various method embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply a precedence in the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. In addition, in the embodiments of the present application, the terms "downlink," "uplink," and "sidelink" are used to indicate the transmission direction of signals or data, where "downlink" is used to indicate the first direction of transmission of signals or data from a site to a user equipment in a cell, "uplink" is used to indicate the second direction of transmission of signals or data from a user equipment in a cell to a site, and "sidelink" is used to indicate the third direction of transmission of signals or data from user equipment 1 to user equipment 2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. Specifically, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0327] Based on the aforementioned embodiments, embodiments of the present application provide corresponding resource mapping devices.

[0328] FIG16 is a schematic diagram of the structure of a resource mapping device provided in an embodiment of the present application, which is applied to a terminal. As shown in FIG16 , the resource mapping device 1600 includes:

[0329] The first mapping unit 1601 is used to map the second-order sidelink control information SCI in the physical sidelink shared channel PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; the demodulation reference signal of the PSSCH exists on the symbol where the first resource unit is located; at least one second resource unit does not overlap or partially overlaps with the symbol used to send the sidelink positioning reference signal SL PRS; the second mapping unit 1602 is used to map the part of the PSSCH that does not contain the second-order SCI to at least one third resource unit that does not contain the second-order SCI.

[0330] In some embodiments, the first mapping unit 1601 is specifically used to: map the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit in the order of frequency domain first, time domain second and index increasing.

[0331] In some embodiments, the first mapping unit 1601 is specifically used to: preferentially map the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one fourth resource unit including the first resource unit, and the symbol where the fourth resource unit is located has the demodulation reference signal and / or physical side control channel PSCCH of the PSSCH; at least one second resource unit includes at least one fourth resource unit.

[0332] In some embodiments, the apparatus 1600 further includes: an adjusting unit, configured to adjust the rate offset of the second-order SCI so that the second resource unit mapping the second-order SCI does not overlap with the symbol used to send the SL PRS.

[0333] In some embodiments, the device 1600 also includes: a discarding unit, which is used to discard the remaining second-order SCI if there is remaining second-order SCI after mapping the second-order SCI to at least one second resource unit when at least one second resource unit does not overlap with the symbol used to send SL PRS.

[0334] In some embodiments, when at least one second resource unit overlaps with a symbol portion used to transmit the SL PRS, the mapped SL PRS in the overlapping portion is covered by the second-order SCI in the second resource unit.

[0335] In some embodiments, in the symbols corresponding to the overlapping portion, the mapped SL PRS that is not covered by the second-order SCI in the second resource unit is allowed to be covered by the portion of the PSSCH that does not include the second-order SCI.

[0336] In some embodiments, the apparatus 1600 further includes a third mapping unit for mapping the SL PRS to symbols for sending the SL PRS before mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit.

[0337] In some embodiments, the time domain position of the symbol used to send SL PRS is determined by the MAC layer or physical layer of the terminal from the candidate time domain positions in the resource pool, or is determined by the physical layer of the terminal from the candidate time domain positions in the resource pool based on the first symbol number; wherein the candidate time domain position is pre-configured or network configured; the first symbol number is the minimum number of symbols determined by the MAC layer for sending SL PRS.

[0338] In some embodiments, the symbols corresponding to the candidate time-domain positions do not include symbols that may be used to send the second-order SCI.

[0339] In some embodiments, when the time domain positions of symbols for transmitting the SL PRS are determined by the MAC layer, the time domain positions of symbols for transmitting the SL PRS determined by the MAC layer do not include symbols that may be used to transmit the second-order SCI.

[0340] In some embodiments, the time domain position of the symbol used to send SL PRS is determined by the MAC layer or physical layer of the terminal, or is determined by the physical layer of the terminal based on the first number of symbols; wherein, there is no PSCCH, PSSCH demodulation reference signal, PSCCH demodulation reference signal or mapped second-order SCI on the symbol used to send SL PRS; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

[0341] In some embodiments, the time domain position of the symbol used to transmit the SL PRS is determined after mapping the second-order SCI to at least one second resource unit.

[0342] In some embodiments, the time domain position of the symbol used to send the SL PRS is determined based on the number of symbols used to send the SL PRS and the starting symbol position; when the time domain position of the symbol used to send the SL PRS is determined by the physical layer based on the first symbol number, the number of symbols used to send the SL PRS determined by the physical layer is greater than or equal to the first symbol number.

[0343] In some embodiments, the time domain position of the symbol used to send SL PRS is determined by the physical layer of the terminal; or, the number of symbols used to send SL PRS is determined by the MAC layer of the terminal, and the starting symbol position of the symbol used to send SL PRS is determined by the physical layer of the terminal based on the number, which is less than or equal to the number of consecutive symbols that can be used to send SL PRS in the time slot.

[0344] In some embodiments, there is no PSCCH, PSSCH demodulation reference signal, or PSCCH demodulation reference signal on the symbol used to transmit the SL PRS.

[0345] In some embodiments, the time domain position of the symbol used to transmit the SL PRS is determined based on the number of symbols used to transmit the SL PRS and the starting symbol position.

[0346] In some embodiments, the time domain position of the demodulation reference signal of the PSSCH within the time slot is determined based on the pattern of the demodulation reference signal of at least one PSSCH pre-configured or network configured in the resource pool; in the pattern of the demodulation reference signal of at least one PSSCH pre-configured or network configured, there are N symbols that do not contain PSCCH between the symbols where the demodulation reference signals of the first and second PSSCH are located, where N is an integer greater than or equal to 0 pre-configured or network configured.

[0347] In some embodiments, the N symbols not containing PSCCH do not overlap with the symbols used to send SL PRS.

[0348] In some embodiments, the third resource unit does not overlap with a symbol used to transmit the SL PRS.

[0349] In some embodiments, the second resource unit and the third resource unit are not occupied by a demodulation reference signal of a PSSCH, a PSCCH, a demodulation reference signal of a PSCCH, or a phase tracking reference signal.

[0350] In some embodiments, the time slot further includes a first-order SCI, and the first-order SCI and / or the second-order SCI include a bit field for indicating the format of the second-order SCI.

[0351] In some embodiments, in the second-order SCI, the bit field for indicating the format of the second-order SCI includes the last bit field in the second-order SCI.

[0352] Those skilled in the art should understand that the relevant description of the above-mentioned resource mapping device in the embodiment of the present application can be understood with reference to the relevant description of the resource mapping method in the embodiment of the present application.

[0353] Figure 17 is a schematic structural diagram of a communication device 1700 provided in an embodiment of the present application. The communication device 1700 shown in Figure 17 includes a processor 1710, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0354] Optionally, as shown in FIG17 , the communication device 1700 may further include a memory 1720. The processor 1710 may call and execute a computer program from the memory 1720 to implement the method in the embodiment of the present application.

[0355] The memory 1720 may be a separate device independent of the processor 1710 , or may be integrated into the processor 1710 .

[0356] Optionally, as shown in FIG17 , the communication device 1700 may further include a transceiver 1730 , and the processor 1710 may control the transceiver 1730 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices.

[0357] The transceiver 1730 may include a transmitter and a receiver. The transceiver 1730 may further include an antenna, and the number of antennas may be one or more.

[0358] The communication device 1700 may specifically be a terminal in an embodiment of the present application, and the communication device 1700 may implement the corresponding processes implemented by the terminal in each method in the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0359] Figure 18 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 1800 shown in Figure 18 includes a processor 1810, which can call and run a computer program from a memory to implement the method according to the embodiment of the present application.

[0360] Optionally, as shown in FIG18 , the chip 1800 may further include a memory 1820 , wherein the processor 1810 may call and execute a computer program from the memory 1820 to implement the method in the embodiment of the present application.

[0361] The memory 1820 may be a separate device independent of the processor 1810 , or may be integrated into the processor 1810 .

[0362] Optionally, the chip 1800 may further include an input interface 1830. The processor 1810 may control the input interface 1830 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0363] Optionally, the chip 1800 may further include an output interface 1840. The processor 1810 may control the output interface 1840 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0364] The chip can be applied to the terminal in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0365] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0366] It should be understood that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-mentioned method embodiment can be completed by hardware integrated logic circuits in the processor or by software instructions. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above-mentioned method.

[0367] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0368] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0369] The present application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to a terminal in the present application, and the computer program causes a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these are not further described here.

[0370] The present application also provides a computer program product including computer program instructions. This computer program product can be applied to a terminal in the present application, and the computer program instructions cause a computer to execute the corresponding processes implemented by the terminal in each method of the present application. For the sake of brevity, these instructions are not further described here.

[0371] The present application also provides a computer program. This computer program can be applied to the terminal in the present application. When the computer program is executed on a computer, it causes the computer to execute the corresponding process implemented by the terminal in each method of the present application. For the sake of brevity, it is not further described here.

[0372] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0373] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0374] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0375] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0376] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0377] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0378] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A resource mapping method, applied to a terminal, the method comprising: Mapping the second-order sidelink control information SCI in the physical sidelink shared channel PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; the demodulation reference signal of the PSSCH exists on the symbol where the first resource unit is located; the at least one second resource unit does not overlap or partially overlaps with the symbol used to send the sidelink positioning reference signal SL PRS; A portion of the PSSCH that does not include the second-order SCI is mapped to at least one third resource unit that does not include the second-order SCI.

2. The method according to claim 1, wherein: The mapping of the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit comprises: The second-order SCI in the PSSCH is mapped from the first resource unit in the time slot to at least one second resource unit including the first resource unit in the order of frequency domain first, time domain second and increasing index.

3. The method according to claim 1, wherein: The mapping of the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit comprises: The second-order SCI in the PSSCH is preferentially mapped from the first resource unit in the time slot to at least one fourth resource unit including the first resource unit, and the symbol where the fourth resource unit is located has a demodulation reference signal of the PSSCH and / or a physical side control channel PSCCH; the at least one second resource unit includes the at least one fourth resource unit.

4. The method according to any one of claims 1 to 3, wherein: The method further comprises: The code rate offset of the second-order SCI is adjusted so that the second resource unit mapping the second-order SCI does not overlap with the symbol used to send the SL PRS.

5. The method according to any one of claims 1 to 3, wherein: The method further comprises: In a case where the at least one second resource unit does not overlap with the symbol used to send the SL PRS, if there is remaining second-order SCI after mapping the second-order SCI to the at least one second resource unit, the remaining second-order SCI is discarded.

6. The method according to any one of claims 1 to 3, wherein: In the case that the at least one second resource unit overlaps with the symbol portion for sending the SL PRS, the mapped SL PRS in the overlapping portion is covered by the second-order SCI in the second resource unit.

7. The method according to claim 6, wherein: In the symbol corresponding to the overlapping part, the mapped SL PRS not covered by the second-order SCI in the second resource unit is allowed to be covered by the part of the PSSCH that does not include the second-order SCI.

8. The method according to any one of claims 1 to 7, wherein: Before mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit, the method further includes: The SL PRS is mapped into the symbols used to transmit the SL PRS.

9. The method according to any one of claims 1 to 8, wherein: The time domain position of the symbol for sending the SL PRS is determined by the MAC layer or the physical layer of the terminal from the candidate time domain positions in the resource pool, or is determined by the physical layer of the terminal from the candidate time domain positions in the resource pool based on the first symbol number; The candidate time domain position is pre-configured or network configured; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

10. The method according to claim 9, wherein: The symbols corresponding to the candidate time domain positions do not include symbols that may be used to send the second-order SCI.

11. The method according to claim 9 or 10, wherein: In the case where the time domain position of the symbol for sending the SL PRS is determined by the MAC layer, the time domain position of the symbol for sending the SL PRS determined by the MAC layer does not include a symbol that may be used to send the second-order SCI.

12. The method according to claims 1 to 3, wherein: The time domain position of the symbol used to send the SL PRS is determined by the MAC layer or the physical layer of the terminal, or is determined by the physical layer of the terminal based on the first symbol number; Among them, there is no PSCCH, PSSCH demodulation reference signal, PSCCH demodulation reference signal or mapped second-order SCI on the symbol used to send SL PRS; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

13. The method according to claim 12, wherein: The time domain position of the symbol used to send the SL PRS is determined after mapping the second-order SCI to the at least one second resource unit.

14. The method according to any one of claims 9 to 13, wherein: The time domain position of the symbol used to send the SL PRS is determined based on the number of symbols used to send the SL PRS and a starting symbol position; In a case where the time domain position of the symbol for sending the SL PRS is determined by the physical layer based on the first number of symbols, the number of symbols for sending the SL PRS determined by the physical layer is greater than or equal to the first number of symbols.

15. The method according to any one of claims 1 to 8, wherein: The time domain position of the symbol used to send the SL PRS is determined by the physical layer of the terminal; or, The number of symbols used to send SL PRS is determined by the MAC layer of the terminal, and the starting symbol position of the symbols used to send SL PRS is determined by the physical layer of the terminal based on the number, and the number is less than or equal to the number of consecutive symbols that can be used to send SL PRS in the time slot.

16. The method according to claim 15, wherein: There is no demodulation reference signal of PSCCH, PSSCH or PSCCH on the symbol used to send SL PRS.

17. The method according to any one of claims 9 to 16, wherein: The time domain position of the symbol used to send the SL PRS is determined based on the number of symbols used to send the SL PRS and the starting symbol position.

18. The method according to any one of claims 1 to 17, wherein: The time domain position of the demodulation reference signal of the PSSCH in the time slot is determined based on a pattern of a demodulation reference signal of at least one PSSCH pre-configured in the resource pool or configured by the network; In the pattern of the demodulation reference signal of at least one PSSCH configured pre-configured or network-configured, there are N symbols not containing PSCCH between the symbols where the demodulation reference signals of the first and second PSSCH are located, where N is an integer greater than or equal to 0 configured pre-configured or network-configured.

19. The method according to claim 18, wherein: The N symbols not including the PSCCH do not overlap with the symbols used to send the SL PRS.

20. The method according to any one of claims 1 to 5, wherein: The third resource unit does not overlap with the symbol used to send the SL PRS.

21. The method according to any one of claims 1 to 20, wherein: The second resource unit and the third resource unit are not occupied by a demodulation reference signal of a PSSCH, a PSCCH, a demodulation reference signal of a PSCCH, or a phase tracking reference signal.

22. The method according to any one of claims 1 to 21, wherein: The time slot also includes a first-order SCI, and the first-order SCI and / or the second-order SCI include a bit field for indicating the format of the second-order SCI.

23. The method according to claim 22, wherein: In the second-order SCI, the bit field used to indicate the format of the second-order SCI includes the last bit field in the second-order SCI.

24. A resource mapping device, the device comprising: A first mapping unit is used to map the second-order sidelink control information SCI in the physical sidelink shared channel PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit; the demodulation reference signal of the PSSCH exists on the symbol where the first resource unit is located; the at least one second resource unit does not overlap or partially overlaps with the symbol used to send the sidelink positioning reference signal SL PRS; The second mapping unit is used to map the part of the PSSCH that does not include the second-order SCI to at least one third resource unit that does not include the second-order SCI.

25. The device according to claim 24, wherein: The first mapping unit is specifically used for: The second-order SCI in the PSSCH is mapped from the first resource unit in the time slot to at least one second resource unit including the first resource unit in the order of frequency domain first, time domain second and increasing index.

26. The device according to claim 24, wherein: The first mapping unit is specifically used for: The second-order SCI in the PSSCH is preferentially mapped from the first resource unit in the time slot to at least one fourth resource unit including the first resource unit, and the symbol where the fourth resource unit is located has a demodulation reference signal of the PSSCH and / or a physical side control channel PSCCH; the at least one second resource unit includes the at least one fourth resource unit.

27. The device according to any one of claims 24 to 26, wherein: The device also includes: An adjusting unit is used to adjust the code rate offset of the second-order SCI so that the second resource unit mapping the second-order SCI does not overlap with the symbol used to send the SL PRS.

28. The device according to any one of claims 24 to 26, wherein: The device also includes: a discarding unit, configured to, when the at least one second resource unit does not overlap with the symbol used to send the SL PRS, If there is remaining second-order SCI after mapping the second-order SCI to the at least one second resource unit, the remaining second-order SCI is discarded.

29. The device according to any one of claims 24 to 26, wherein: In the case that the at least one second resource unit overlaps with the symbol portion for sending the SL PRS, the mapped SL PRS in the overlapping portion is covered by the second-order SCI in the second resource unit.

30. The device according to claim 29, wherein: In the symbol corresponding to the overlapping part, the mapped SL PRS not covered by the second-order SCI in the second resource unit is allowed to be covered by the part of the PSSCH that does not include the second-order SCI.

31. The device according to any one of claims 24 to 30, wherein: The device also includes: The third mapping unit is used to map the SL PRS to the symbol used to send the SL PRS before mapping the second-order SCI in the PSSCH from the first resource unit in the time slot to at least one second resource unit including the first resource unit.

32. The device according to any one of claims 24 to 31, wherein: The time domain position of the symbol for sending the SL PRS is determined by the MAC layer or the physical layer of the terminal from the candidate time domain positions in the resource pool, or is determined by the physical layer of the terminal from the candidate time domain positions in the resource pool based on the first symbol number; The candidate time domain position is pre-configured or network configured; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

33. The device according to claim 32, wherein: The symbols corresponding to the candidate time domain positions do not include symbols that may be used to send the second-order SCI.

34. The device according to claim 32 or 33, wherein: In the case where the time domain position of the symbol for sending the SL PRS is determined by the MAC layer, the time domain position of the symbol for sending the SL PRS determined by the MAC layer does not include a symbol that may be used to send the second-order SCI.

35. The device according to claims 24 to 26, wherein: The time domain position of the symbol used to send the SL PRS is determined by the MAC layer or the physical layer of the terminal, or is determined by the physical layer of the terminal based on the first symbol number; Among them, there is no PSCCH, PSSCH demodulation reference signal, PSCCH demodulation reference signal or mapped second-order SCI on the symbol used to send SL PRS; the first number of symbols is the minimum number of symbols determined by the MAC layer for sending SL PRS.

36. The device according to claim 35, wherein The time domain position of the symbol used to send the SL PRS is determined after mapping the second-order SCI to the at least one second resource unit.

37. The device according to any one of claims 32 to 36, wherein: The time domain position of the symbol used to send the SL PRS is determined based on the number of symbols used to send the SL PRS and the starting symbol position; In a case where the time domain position of the symbol for sending the SL PRS is determined by the physical layer based on the first number of symbols, the number of symbols for sending the SL PRS determined by the physical layer is greater than or equal to the first number of symbols.

38. The device according to any one of claims 24 to 31, wherein: The time domain position of the symbol used to send the SL PRS is determined by the physical layer of the terminal; or, The number of symbols used to send SL PRS is determined by the MAC layer of the terminal, and the starting symbol position of the symbols used to send SL PRS is determined by the physical layer of the terminal based on the number, and the number is less than or equal to the number of consecutive symbols that can be used to send SL PRS in the time slot.

39. The device according to claim 38, wherein There is no demodulation reference signal of PSCCH, PSSCH or PSCCH on the symbol used to send SL PRS.

40. The device according to any one of claims 32 to 39, wherein: The time domain position of the symbol used to send the SL PRS is determined based on the number of symbols used to send the SL PRS and the starting symbol position.

41. The device according to any one of claims 24 to 40, wherein: The time domain position of the demodulation reference signal of the PSSCH in the time slot is determined based on a pattern of a demodulation reference signal of at least one PSSCH pre-configured in the resource pool or configured by the network; In the pattern of the demodulation reference signal of at least one PSSCH configured pre-configured or network-configured, there are N symbols not containing PSCCH between the symbols where the demodulation reference signals of the first and second PSSCH are located, where N is an integer greater than or equal to 0 configured pre-configured or network-configured.

42. The device according to claim 41, wherein The N symbols not including the PSCCH do not overlap with the symbols used to send the SL PRS.

43. The device according to any one of claims 24 to 28, wherein: The third resource unit does not overlap with the symbol used to send the SL PRS.

44. The device according to any one of claims 24 to 43, wherein: The second resource unit and the third resource unit are not occupied by a demodulation reference signal of a PSSCH, a PSCCH, a demodulation reference signal of a PSCCH, or a phase tracking reference signal.

45. The device according to any one of claims 24 to 44, wherein: The time slot also includes a first-order SCI, and the first-order SCI and / or the second-order SCI include a bit field for indicating the format of the second-order SCI.

46. ​​The device according to claim 45, wherein In the second-order SCI, the bit field used to indicate the format of the second-order SCI includes the last bit field in the second-order SCI.

47. A terminal, comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 23.

48. A chip, comprising: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 23.

49. A computer-readable storage medium for storing a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 23.

50. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 23.

51. A computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 23.

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