Lateral communication method and device, equipment and storage medium

Abstract

The invention discloses a sidewalk communication method and device, equipment and a storage medium, and relates to the technical field of communication. The method comprises: a terminal device transmitting or receiving a PSCCH, the PSCCH being used for indicating a transmission mode of an SL PRS, and a transmission resource and / or a transmission mode of the PSCCH being related to a transmission resource of the SL PRS (1210). A plurality of terminal devices can adopt different transmission resources to send the SL PRS, different terminal devices can respectively send the PSCCHs to indicate the sending modes of the SL PRS sent by the terminal devices, and the transmission resources and / or the transmission modes of the PSCCHs are related to the transmission resources of the SL PRS, so that the PSCCHs which are sent by different terminal devices and are used for indicating the sending modes of the SL PRS can be multiplexed, and the SL PRS sending modes can be multiplexed. Mutual interference between PSCCHs sent by different terminal devices can be reduced, it is ensured that a receiving end receives SL PRSs, and the positioning precision is improved.

Description

Sideline communication method, device, equipment and storage medium Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a sideline communication method, apparatus, device, and storage medium. Background Art

[0002] With the development of sidelink communication technology, sidelink-based positioning technology has been introduced. In sidelink-based positioning technology, SL PRS (Sidelink Positioning Reference Signal) needs to be transmitted between sidelink communication terminal devices, and the transmission mode of the SL PRS can be indicated by the PSCCH (Physical Sidelink Control Channel).

[0003] With the evolution of technology, positioning technology based on sidelinks needs further research.

[0004] Summary of the Invention

[0005] The present invention provides a sideline communication method, apparatus, device, and storage medium. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a sideline communication method is provided, the method being executed by a terminal device, the method comprising:

[0007] Send or receive PSCCH, where the PSCCH is used to indicate the transmission method of the SL PRS, and the transmission resources and / or transmission method of the PSCCH are related to the transmission resources of the SL PRS.

[0008] According to one aspect of an embodiment of the present application, a sideline communication device is provided, the device comprising:

[0009] The transmission module is used to send or receive PSCCH, where the PSCCH is used to indicate the transmission method of the SL PRS, and the transmission resources and / or transmission method of the PSCCH are related to the transmission resources of the SL PRS.

[0010] According to one aspect of an embodiment of the present application, a terminal device is provided, comprising a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the above-mentioned sideline communication method.

[0011] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to be executed by a processor to implement the above-mentioned sideline communication method.

[0012] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions, and when the chip is running, is used to implement the above-mentioned side communication method.

[0013] According to one aspect of an embodiment of the present application, a computer program product is provided, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned side communication method.

[0014] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0015] In SL-based positioning, multiple terminal devices can use different transmission resources to send SL PRS. Different terminal devices can respectively send PSCCH to indicate the sending method of the SL PRS sent by themselves. The transmission resources and / or transmission method of PSCCH are related to the transmission resources of SL PRS, so that the PSCCH sent by different terminal devices to indicate the sending method of SL PRS can be multiplexed, thereby reducing the mutual interference between PSCCHs sent by different terminal devices, ensuring the reception of SL PRS by the receiving terminal device, and thus improving the positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0017] FIG2 is a schematic diagram of a portion of symbols in a time slot used for SL transmission according to an embodiment of the present application;

[0018] FIG3 is a schematic diagram of a PSCCH and PSSCH time slot structure provided by one embodiment of the present application;

[0019] FIG4 is a schematic diagram of the time domain positions of four DMRS symbols when the PSSCH has 13 symbols according to an embodiment of the present application;

[0020] FIG5 is a schematic diagram of a PSSCH DMRS frequency domain position provided by an embodiment of the present application;

[0021] FIG6 is a schematic diagram of PSCCH and PSSCH resource pools in NR-V2X provided by one embodiment of the present application;

[0022] FIG7 is a schematic diagram of a time slot structure of an NR system provided by an embodiment of the present application;

[0023] FIG8 is a schematic diagram of comb tooth size and RE offset provided by one embodiment of the present application;

[0024] FIG9 is a schematic diagram of interleaved resource blocks provided by one embodiment of the present application;

[0025] FIG10 is a schematic diagram of a frame structure based on interleaved resource blocks provided by one embodiment of the present application;

[0026] FIG11 is a schematic diagram of an RB set provided by an embodiment of the present application;

[0027] FIG12 is a flowchart of a side communication method provided by one embodiment of the present application;

[0028] FIG13 is a schematic diagram of PSCCH and SL PRS resource occupancy within one SL PRS time domain resource provided by an embodiment of the present application;

[0029] FIG14 is a schematic diagram of REs occupied by DMRS within an RB according to an embodiment of the present application;

[0030] FIG15 is a schematic diagram of PSCCH and SL PRS resource occupancy within one SL PRS time domain resource provided by another embodiment of the present application;

[0031] FIG16 is a schematic diagram of PSCCH and SL PRS resource occupancy within one SL PRS time domain resource provided by another embodiment of the present application;

[0032] FIG17 is a schematic diagram of PSCCH and SL PRS resource occupancy in a time slot provided by an embodiment of the present application;

[0033] FIG18 is a schematic diagram of PSCCH and SL PRS resource occupancy within a time slot provided by another embodiment of the present application;

[0034] FIG19 is a schematic diagram of PSCCH and SL PRS resource occupancy within a time slot provided by another embodiment of the present application;

[0035] FIG20 is a block diagram of a side communication device provided by one embodiment of the present application;

[0036] FIG21 is a schematic structural diagram of a terminal device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0038] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0039] Please refer to Figure 1, which shows a schematic diagram of a network architecture provided by an embodiment of the present application. The network architecture may include: a core network 11, an access network 12, and a terminal device 13.

[0040] The core network 11 includes several core network devices. The functions of the core network devices are mainly to provide user connections, user management, and service carrying, and to provide an interface to the external network as a bearer network. For example, the core network of a 5G (5th Generation) NR (New Radio) system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity.

[0041] The access network 12 includes several access network devices 14. The access network in the 5G NR system can be called NG-RAN (New Generation-Radio Access Network). The access network device 14 is a device deployed in the access network 12 to provide wireless communication functions for the terminal device 13. The access network device 14 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, they are called gNodeB or gNB. With the evolution of communication technology, the name of "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 13 are collectively referred to as access network devices.

[0042] The number of terminal devices 13 is usually multiple, and one or more terminal devices 13 can be distributed in the cell managed by each access network device 14. The terminal device 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment, mobile stations (MS), etc. For the convenience of description, the devices mentioned above are collectively referred to as terminal devices. The access network device 14 and the core network device communicate with each other through some air technology, such as the NG interface in the 5G NR system. The access network device 14 and the terminal device 13 communicate with each other through some air technology, such as the Uu interface. The "terminal device" in the embodiment of the present application may also be referred to as UE, and the two express the same meaning.

[0043] Terminal devices 13 and terminal devices 13 (for example, vehicle-mounted devices and other devices (such as other vehicle-mounted devices, mobile phones, RSU (Road Side Unit, road test unit), etc.)) can communicate with each other through a direct communication interface (such as a PC5 interface). Accordingly, the communication link established based on the direct communication interface can be called a direct link or SL. SL transmission is the direct communication and data transmission between terminal devices through a side link. Unlike traditional cellular systems where communication data is received or sent through access network equipment, SL transmission has the characteristics of short delay and low overhead, and is suitable for communication between two terminal devices that are geographically close (such as vehicle-mounted devices and other peripheral devices that are geographically close). It should be noted that in Figure 1, only vehicle-to-vehicle communication in the V2X (vehicle to everything) scenario is used as an example. SL technology can be applied to scenarios where direct communication is carried out between various terminal devices. In other words, the terminal device in this application refers to any device that communicates using SL technology.

[0044] The "5G NR system" in the embodiments of this application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of this application can be applied to the 5G NR system and can also be applied to subsequent evolution systems of the 5G NR system.

[0045] Before introducing the technical solutions of this application, we first introduce and explain some of the background technologies involved in this application. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0046] 1. NR-V2X time slot structure

[0047] In NR-V2X, PSSCH (Physical Sidelink Shared Channel) and its associated PSCCH are transmitted in the same time slot, and PSCCH occupies 2 or 3 time domain symbols. The time domain resource allocation of NR-V2X is based on the time slot as the allocation granularity. The starting point and length of the time domain symbols used for sidelink transmission in a time slot are configured by the parameters sl-startSLsymbols and sl-lengthSLsymbols. The last symbol in this part of the symbols is used as the GP (Guard Period). PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH (Physical Sidelink Feedback Channel) transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the AGC (Automatic Gain Control) and GP symbols before the symbol.

[0048] As shown in Figure 2, the network configuration sl-StartSymbol = 3, sl-LengthSymbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time domain symbols that can be used for PSSCH transmission are symbols 3 to 9, and PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5. Symbol 3 is usually used as an AGC symbol.

[0049] In NR-V2X, a sidelink timeslot contains not only the PSCCH and PSSCH but also the PSFCH, as shown in Figure 3. As can be seen, within a timeslot, the first OFDM (Orthogonal Frequency Division Multiplexing) symbol is fixedly used for AGC. On this AGC symbol, the UE replicates the information sent on the second symbol. The last symbol of the timeslot is reserved for the transmit / receive transition, allowing the UE to switch from a transmit (or receive) state to a receive (or transmit) state. In the remaining OFDM symbols, the PSCCH can occupy two or three OFDM symbols starting from the second sidelink symbol. In the frequency domain, the number of PRBs (Physical Resource Blocks) occupied by the PSCCH is within the range of a PSSCH subband. If the number of PRBs occupied by the PSCCH is less than the size of a PSSCH subchannel, or if the frequency domain resources of the PSSCH include multiple subchannels, the PSCCH can be frequency-division multiplexed with the PSSCH in the OFDM symbol where the PSCCH resides.

[0050] 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 (Demodulation Reference Signal) 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 (OCCs) for random selection by the transmitting UE, 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.

[0051] Table 1 OCC mask of PSCCH DMRS

[0052] The DMRS for the PSSCH in NR-V2X draws on the design of the 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 4 shows a schematic diagram of the time-domain positions of four DMRS symbols when the PSSCH has 13 symbols.

[0053] Table 2 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0054] If multiple time-domain DMRS patterns are configured in the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI (Sidelink Control Information). This design allows high-speed UEs to select a high-density DMRS pattern to ensure channel estimation accuracy, while low-speed UEs can use a low-density DMRS pattern to improve spectrum efficiency.

[0055] The generation method of the PSSCH DMRS sequence is almost the same as that of the PSCCH DMRS sequence. The only difference is that the initialization parameter of the pseudo-random sequence c(m) is c init , used to determine c init of p i The i-th CRC (Cyclic Redundancy Check) of the PSCCH that schedules the PSSCH, where L=24 is the number of bits of the PSCCH CRC.

[0056] NR PDSCH and PUSCH (Physical Uplink Shared Channel) support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2, and for each frequency domain type, there are two different types of single DMRS symbols and double DMRS symbols. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, and single-symbol DMRS frequency domain type 2 can support 6 DMRS ports. In the case of double DMRS symbols, the number of supported ports is doubled. However, in 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 5.

[0057] 2. Determination of NR-V2X frequency domain resources

[0058] 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. 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:

[0059] Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs in a subchannel in the resource pool. The value range is {10, 12, 15, 20, 50, 75, 100} PRBs.

[0060] Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0061] sl-StartRB-Subchannel: indicates the starting PRB index of the first subchannel in the resource pool.

[0062] PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0063] PSCCH frequency domain resource indicator (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, with a value range of {10, 12, 15, 20, 25} PRB;

[0064] 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.

[0065] 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 6.

[0066] In NR-V2X, the PSCCH is used to carry side control information related to resource sensing, including:

[0067] The priority of the scheduled transmission;

[0068] Frequency domain resource allocation, indicating the number of frequency domain resources for the PSSCH in the current time slot scheduled by the PSCCH, as well as the number and starting positions of the frequency domain resources for a maximum of two retransmission resources reserved;

[0069] Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0070] PSSCH reference signal pattern;

[0071] Second-level SCI format;

[0072] Second-order SCI rate offset;

[0073] Number of PSSCH DMRS ports;

[0074] MCS (Modulation and Coding Scheme);

[0075] MCS form instructions;

[0076] Number of PSFCH symbols;

[0077] Resource reservation period: reserves resources for transmission by another TB (Transport Block) in the next period. If inter-TB resource reservation is not enabled in the resource pool configuration, this information bit field does not exist.

[0078] Reserved bits: 2 to 4 bits. The specific number of bits is configured by the network or pre-configured.

[0079] 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.

[0080] 3. Determination of NR-V2X time domain resources (time slots)

[0081] 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 / PSSCH in one time slot through TDM (Time Division Multiplexing). The PSCCH / PSSCH between different users can be multiplexed in one time slot through FDM (Frequency Division Multiplexing). 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 transmissions are also based on the subframe granularity, so the side transmission is also based on the subframe granularity (special subframes in the TDD system are not used for side transmission). The NR system uses a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols, enabling more flexible scheduling and reducing latency. A typical NR system subframe is shown in Figure 7. A time slot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols are located at the beginning of the time slot, while uplink symbols are located at the end of the time slot. Flexible symbols are located between downlink and uplink symbols, and the number of each type of symbol in each time slot is configurable.

[0082] 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.

[0083] 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.

[0084] 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:

[0085] The total number of time slots included in one SFN cycle is 10240×2 μ , where the parameter μ is related to the subcarrier spacing;

[0086] 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.

[0087] The specific steps include:

[0088] Step 1: Remove the time slots that do not belong to the resource pool within the SFN (System Frame Number) period, 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

[0089] in:

[0090] N S_SSB Indicates the number of synchronization time slots in an SFN cycle; the synchronization time slot is determined according to the synchronization-related configuration parameters, and is related to the period of transmitting SSB (Synchronization Signal Block) and the number of SSB transmission resources configured in the period.

[0091] N 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.

[0092] Step 2: Determine the number of reserved time slots and their corresponding time domain locations.

[0093] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot,

[0094] Where: N reserved =(10240×2 μ -N S_SSB -N nonSL )mod L bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0095] 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 .

[0096] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0097] 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 .

[0098] Step 5: Renumber the time slots in the resource pool identified in step 4 into Among them, T′ max Indicates the number of time slots included in the resource pool.

[0099] 4. Downlink-based positioning

[0100] In downlink positioning, up to four positioning frequency layers (Frequency Layer) DL PRS configurations can be provided for a UE. The parameter structure of each positioning frequency layer provides the following PRS signal configuration parameters:

[0101] The subcarrier spacing of the PRS signal.

[0102] The cyclic prefix (CP) length of the PRS signal.

[0103] PRS frequency domain resource bandwidth: This parameter is the number of physical resource blocks (PRBs) allocated to the PRS signal. The minimum PRS resource bandwidth is 24 PRBs, with a granularity of 4 PRBs, and the maximum is 272 PRBs.

[0104] PRS resource frequency domain starting frequency position: 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.

[0105] The frequency domain reference point of the PRS signal is PointA.

[0106] The comb size of the PRS signal, Comb-N.

[0107] The above PRS parameters configured in each positioning frequency layer will be applied to all PRS resources contained in this positioning frequency layer. That is to say, in a positioning frequency layer, all PRS signals from multiple different TRPs (Transmit Receive Points) will use the same subcarrier spacing and CP length, the same comb size, be sent on the same frequency subband, and occupy exactly the same bandwidth. This design can support the UE to simultaneously receive and measure PRS signals from multiple different TRPs on the same frequency point.

[0108] The parameters of the TRP layer include an ID parameter used to uniquely identify the positioning TRP, the physical cell ID of the TRP, the NR Cell Global Identifier (NCGI) of the TRP, and the ARFCN (Absolute Radio Frequency Channel Number) of the TRP. Each TRP layer can be configured with up to two DL PRS resource sets. The parameters of the DL PRS resource set layer are configured with the following parameters, which will apply to all DL PRS resources contained in this resource set.

[0109] DL PRS resource set identification ID (nr-DL-PRS-ResourceSetID).

[0110] ·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 this DL PRS resource set. The minimum value of the configurable DL PRS transmission period is 4 milliseconds, and the maximum value is 10240 milliseconds. The configuration of DL PRS supports flexible subcarrier spacing, including 15KHz, 30KHz, 60KHz and 120KHz. Under different subcarrier spacing conditions, the range of configurable DL PRS transmission period values ​​is the same. Figure 8 shows a schematic diagram of a comb size of 2 and RE offsets of 0 and 1.

[0111] · DL PRS resource repetition factor (dl-PRS-ResourceRepetitionFactor): This parameter defines the number of times a PRS resource is repeatedly transmitted in each PRS period. 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.

[0112] DL-PRS-ResourceTimeGap: This parameter defines the number of time slots between two consecutive retransmissions of the same PRS resource.

[0113] · 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.

[0114] 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.

[0115] As mentioned above, all parameters configured in a DL PRS resource set are applied to all DL PRS resources contained in the resource set. Therefore, all DL PRS resources in the same DL PRS resource set are transmitted with the same periodicity, the same number of repetitions, and occupy the same number of OFDM symbols.

[0116] Each DL PRS resource is configured with the following parameters:

[0117] A DL PRS resource identification ID (nr-DL-PRS-ResourceID).

[0118] DL PRS sequence ID (dl-PRS-SequenceID).

[0119] 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.

[0120] 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.

[0121] 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 starting OFDM symbol index within a time slot.

[0122] DL PRS QCL information (dl-PRS-QCL-Info): This parameter provides the Quasi Co-Location (QCL) information of the DL PRS signal.

[0123] 5. Sidelink transmission in unlicensed spectrum (SL-U)

[0124] When performing sidelink transmission over unlicensed spectrum (SL-U), sidelink transmission must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, the UE must occupy at least 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 must not exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmission over unlicensed spectrum uses an interlaced resource block (IRB) structure. An IRB consists of N discrete resource blocks (RBs) in the frequency domain. A total of M IRBs exist within the frequency band, and the mth IRB consists of RBs in the order {m, M+m, 2M+m, 3M+m, ...}.

[0125] As shown in FIG9 , the system bandwidth includes 20 RBs, including 5 IRBs (i.e., M=5), each IRB includes 4 RBs (i.e., N=4), and the frequency domain intervals of two adjacent RBs belonging to the same IRB are the same, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB indexes.

[0126] 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 10, where the numbers within the boxes represent the IRB index. Figure 10 illustrates the frame structure for a timeslot containing only the PSCCH and PSSCH, but not the PSFCH. The bandwidth shown in the figure includes 20 RBs, with five IRB resources configured (i.e., M = 5). Each IRB resource consists of four RBs, and the numbers within the boxes represent the IRB index. In Figure 10, 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 timeslot 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, the figure does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0127] In unlicensed spectrum, UEs access channels through LBT (Listen Before Talk). LBT uses a granularity of 20 MHz in the frequency domain, with each 20 MHz being called an RB Set. A carrier can include multiple RB Sets, with guard intervals between RB Sets, as shown in Figure 11.

[0128] In the unlicensed spectrum, the UE needs to perform LBT first. Only after passing LBT can it access the channel. However, the time for the UE to complete LBT is uncertain. If the UE is restricted to sending from the starting point of a time slot, the UE may miss the sending opportunity because it fails to complete LBT before then. Therefore, in SL-U, it is considered to add a sending starting point within a time slot, that is, multi-starting point transmission. For example, the additional starting point can be the 3rd or 4th OFDM symbol in the time slot.

[0129] 6. Positioning based on sidelink

[0130] In 3GPP R-17, 3GPP RAN conducted research on "NR Positioning Enhancements" and "Scenarios and Requirements for NR Positioning Use Cases in In-Coverage, Partial Coverage, and Out-of-Coverage." The "Scenarios and Requirements for NR Positioning Use Cases in In-Coverage, Partial Coverage, and Out-of-Coverage" study focused on V2X and public safety use cases. Furthermore, the 3GPP SA1 Working Group developed requirements for "Ranging-Based Services" and positioning accuracy requirements for IIoT use cases in out-of-coverage scenarios. 3GPP is required to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0131] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies on positioning technology based on sidetrack positioning reference signals in the early stages of Rel-18. Next, 3GPP will standardize solutions for sidetrack positioning (including ranging and direction finding) in NR systems.

[0132] On the sidelink, different UEs may send SL PRS using different time-frequency resources, and how the PSCCH used to indicate SL PRS transmission should be multiplexed is an unresolved issue. To address this issue, the following embodiments of this application provide a solution, which will be elaborated in detail below. In addition, in this application, unless otherwise stated, all indexes / numbers are counted starting from 0.

[0133] Please refer to Figure 12, which shows a flow chart of a sideline communication method provided by an embodiment of the present application. The method can be applied to the network architecture shown in Figure 1, for example, the method can be executed by a terminal device. The method may include at least one of the following steps:

[0134] Step 1210: The terminal device sends or receives PSCCH, where PSCCH is used to indicate the transmission method of SL PRS. The transmission resources and / or transmission method of PSCCH are related to the transmission resources of SL PRS.

[0135] In some embodiments, a terminal device may transmit a PSCCH, for example, a terminal device transmits a PSCCH to another terminal device. In some embodiments, a terminal device may receive a PSCCH, for example, a terminal device receives a PSCCH transmitted by another terminal device. In the embodiments of the present application, there is no limitation on the transmission method of the PSCCH. For example, the PSCCH may be transmitted in a unicast, multicast, or broadcast manner.

[0136] In an embodiment of the present application, the PSCCH is used to indicate the transmission mode of the SL PRS. In some embodiments, the transmission mode of the SL PRS includes at least one of the following:

[0137] The time slot or slots where the SL PRS is located;

[0138] One or more OFDM symbols occupied by the SL PRS in the time slot;

[0139] The PRB or IRB occupied by the SL PRS in one or more OFDM symbols;

[0140] REs occupied by the SL PRS in one or more OFDM symbols;

[0141] repetition period of SL PRS;

[0142] SL PRS receiving terminal ID information;

[0143] SL PRS sending terminal ID information;

[0144] Sequence information of SL PRS.

[0145] Among them, the receiving terminal ID information of SL PRS can also be understood as the target receiving terminal ID information of SL PRS, which is used to indicate the receiving terminal / target receiving terminal of the SL PRS. The sending terminal ID information of SL PRS is used to indicate the sending terminal of the SL PRS. Different terminal devices can have different ID information to distinguish different terminal devices. Optionally, the sequence information of SL PRS includes at least the sequence ID information of SL PRS. Optionally, the sequence information of SL PRS can be indirectly indicated by the receiving terminal ID information of SL PRS.

[0146] In an embodiment of the present application, in SL-based positioning, multiple terminal devices can use different transmission resources to send SL PRS, and different terminal devices can respectively send PSCCH to indicate the sending method of the SL PRS sent by themselves. The transmission resources and / or transmission method of PSCCH are related to the transmission resources of SL PRS, so that the PSCCH sent by different terminal devices to indicate the sending method of SL PRS can be multiplexed, thereby reducing the mutual interference between PSCCHs sent by different terminal devices, ensuring the reception of SL PRS by the receiving terminal device, and thus improving the positioning accuracy.

[0147] In some embodiments, the transmission resources and / or transmission mode of the PSCCH include: the OCC of the DMRS of the PSCCH. The OCC of the DMRS of the PSCCH is related to the transmission resources of the SL PRS. For example, the time-frequency position of the DMRS of the PSCCH sent by different terminal devices is the same, and the OCC of the DMRS is different. That is, the PSCCHs sent by different terminal devices can be distinguished by the OCC of the DMRS of the PSCCH.

[0148] In some embodiments, the transmission resources and / or transmission mode of the PSCCH include: the time-frequency position of the DMRS of the PSCCH. The time-frequency position of the DMRS of the PSCCH is related to the transmission resources of the SL PRS. Exemplarily, the time-frequency positions of the DMRS of the PSCCH sent by different terminal devices are different. That is, the PSCCHs sent by different terminal devices can be distinguished by the time-frequency positions of the DMRS of the PSCCH. The time-frequency position of the DMRS refers to the position of the time-frequency resources occupied by the DMRS, and the time-frequency resources include time domain resources and frequency domain resources. The time-frequency positions of two DMRSs are different, which may be that the time domain resources occupied by the two DMRSs are the same but the frequency domain resources are different, or the time domain resources occupied by the two DMRSs are different but the frequency domain resources are the same, or the time domain resources occupied by the two DMRSs are different and the frequency domain resources are different.

[0149] In some embodiments, to ensure the accuracy of channel estimation, the terminal device cannot transmit the modulation symbols of the PSCCH at the time-frequency position of the DMRS that can be used to transmit the PSCCH; and / or the transmit power of the DMRS of the PSCCH is greater than the transmit power of the modulation symbols of the PSCCH. For example, the transmit power of the DMRS of the PSCCH is greater than the transmit power of the modulation symbols of the PSCCH relative to the transmit power of the modulation symbols of the PSCCH. The first threshold can be configured by the network, pre-configured, specified by the standard, or depends on the implementation of the terminal device. Exemplarily, the first threshold is 2dB.

[0150] In some embodiments, the transmission resources and / or transmission mode of the PSCCH include: the frequency domain position of the PSCCH. The frequency domain position of the PSCCH is related to the transmission resources of the SL PRS. For example, the frequency domain positions of the PSCCHs sent by different terminal devices are different. That is, the PSCCHs sent by different terminal devices can be distinguished by the frequency domain positions of the PSCCHs. Among them, the frequency domain position of the PSCCH refers to the position of the frequency domain resources occupied by the PSCCH.

[0151] In some embodiments, the transmission resources of the SL PRS include: the time domain position and / or frequency domain position of the SL PRS. The time domain position of the SL PRS refers to the position of the time domain resources occupied by the SL PRS, and the frequency domain position of the SL PRS refers to the position of the frequency domain resources occupied by the SL PRS. Exemplarily, the frequency domain position of the SL PRS is related to the RE offset of the SL PRS.

[0152] In some embodiments, the OCC of the DMRS of the PSCCH is related to the frequency domain position of the SL PRS. Optionally, the OCC of the DMRS of the PSCCH is related to the RE offset of the SL PRS. Exemplarily, the time-frequency position of the DMRS of the PSCCH sent by different terminal devices is the same, the OCC of the DMRS is different, and the OCC of the DMRS is related to the RE offset of the SL PRS. Exemplarily, the PSCCH corresponding to the SL PRS sent by different frequency domain resources within the same time domain resources occupies the same time-frequency resources, but for the SL PRS sent by different RE offsets, the OCC of the DMRS of the PSCCH is different.

[0153] In some embodiments, the time-frequency position of the DMRS of the PSCCH is related to the frequency domain position of the SL PRS. Optionally, the time-frequency position of the DMRS of the PSCCH is related to the RE offset of the SL PRS. Exemplarily, the time-frequency position of the DMRS of the PSCCH sent by different terminal devices is different, and the time-frequency position of the DMRS is related to the RE offset of the SL PRS. Exemplarily, the PSCCH corresponding to the SL PRS sent by different frequency domain resources within the same time domain resources occupies the same time-frequency resources, but for the SL PRS sent by different RE offsets, the RE positions occupied by the DMRS of the PSCCH are different. Exemplarily, in order to ensure the accuracy of channel estimation, the transmission power of the DMRS of the PSCCH on each RE is greater than the transmission power of the modulation symbol of the PSCCH; and / or, on the RE that may be used to send the DMRS of the PSCCH, the terminal device does not send the modulation symbol of the PSCCH.

[0154] In some embodiments, the frequency domain position of the PSCCH is related to the frequency domain position of the SL PRS. Optionally, the frequency domain position of the PSCCH is related to the RE offset of the SL PRS. Exemplarily, the frequency domain positions of the PSCCHs sent by different terminal devices are different and are uniquely determined by the RE offset of the SL PRS. Exemplarily, the PSCCHs corresponding to the SL PRSs sent by different frequency domain resources within the same time domain resources are frequency-division multiplexed, and the frequency domain position of the PSCCH is uniquely determined by the RE offset of the SL PRS sent by the terminal device.

[0155] In some embodiments, the frequency domain position of the PSCCH is related to the time domain position and frequency domain position of the SL PRS. Optionally, the frequency domain position of the PSCCH is related to the time domain position and RE offset of the SL PRS. Exemplarily, the frequency domain positions of the PSCCHs sent by different terminal devices are different, and are uniquely determined by the time domain position and RE offset of the SL PRS. Exemplarily, the PSCCHs corresponding to the SL PRSs sent in different time domain resources are frequency division multiplexed, and the frequency domain position of the PSCCH is uniquely determined by the time domain resources and RE offset of the SL PRS sent by the terminal device.

[0156] In some embodiments, the PSCCH and the SL PRS are located in adjacent OFDM symbols of the same time slot. Exemplarily, the OFDM symbol occupied by the PSCCH is located before the OFDM symbol occupied by the SL PRS indicated by the PSCCH, and the two are adjacent. For example, in a certain time slot, the OFDM symbols contained in the time slot are arranged in ascending order, the PSCCH occupies the OFDM symbol #i+1 of the time slot, and the SL PRS indicated by the PSCCH occupies the OFDM symbol #i+2 and OFDM symbol #i+3 of the time slot, wherein the OFDM symbol #i+1, OFDM symbol #i+2, and OFDM symbol #i+3 are arranged in ascending order.

[0157] In some embodiments, the bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard, or indicated by the PSCCH. For example, the bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard as the bandwidth of the SL PRS resource pool. For example, the bandwidth occupied by the SL PRS is less than or equal to the bandwidth of the SL PRS resource pool, the bandwidth occupied by the SL PRS is indicated by the PSCCH, the bandwidth occupied by the SL PRS includes one or more sub-channels, each sub-channel includes one or more PRBs or IRBs, and the number of PRBs or IRBs included is configured by the network, or pre-configured or specified by the standard.

[0158] In some embodiments, the bandwidth of the PSCCH is less than or equal to the bandwidth of the SL PRS. Exemplarily, the bandwidth of the SL PRS includes at least one subchannel, each subchannel includes at least one PRB or IRB, and the bandwidth of the PSCCH is less than or equal to one subchannel. Exemplarily, the bandwidth of the PSCCH is equal to floor(B / Y), where B is the number of PRBs or IRBs occupied by the SL PRS, or B is the number of PRBs or IRBs contained in the SL PRS resource pool, Y is the number of RE offsets allowed in the time domain resources of the SL PRS, and floor() represents rounding down.

[0159] In some embodiments, within a SL PRS time domain resource, the transmission power of the terminal device remains constant; wherein, a SL PRS time domain resource includes: the time domain resources occupied by the PSCCH and the time domain resources occupied by the SL PRS indicated by the PSCCH. Optionally, a SL PRS time domain resource also includes: the time domain resources occupied by the AGC. wherein, the time domain resources occupied by the AGC are located before the time domain resources occupied by the PSCCH. Exemplarily, the AGC, PSCCH and SL PRS are located in adjacent OFDM symbols of the same time slot, the OFDM symbol occupied by the AGC is located before the OFDM symbol occupied by the PSCCH, and the two are adjacent, the OFDM symbol occupied by the PSCCH is located before the OFDM symbol occupied by the SL PRS indicated by the PSCCH, and the two are adjacent. For example, within a certain time slot, the OFDM symbols contained in the time slot are arranged in ascending order, the AGC occupies OFDM symbol #i of the time slot, the PSCCH occupies OFDM symbol #i+1 of the time slot, and the SL PRS indicated by the PSCCH occupies OFDM symbol #i+2 and OFDM symbol #i+3 of the time slot, where OFDM symbol #i, OFDM symbol #i+1, OFDM symbol #i+2, and OFDM symbol #i+3 are numbered from small to large. In addition, within an SL PRS time domain resource, the transmit power of the terminal device remains constant, which helps to ensure the receiving performance of the receiving end.

[0160] In some embodiments, the transmission resources of the SL PRS are determined from a dedicated resource pool of the SL PRS, wherein the dedicated resource pool of the SL PRS refers to a resource pool dedicated to transmitting the SL PRS, and other information in the SL communication except the SL PRS cannot be transmitted using resources in the dedicated resource pool of the SL PRS.

[0161] In some embodiments, the transmission resources of the SL PRS are determined from a shared resource pool of the SL PRS and SL communications. The shared resource pool refers to a resource pool shared by the SL PRS and other information in the SL communications except the SL PRS, and the SL PRS and other information in the SL communications except the SL PRS can all be transmitted using resources in the shared resource pool.

[0162] In an embodiment of the present application, in SL-based positioning, multiple terminal devices can use different transmission resources to send SL PRS, and different terminal devices can respectively send PSCCH to indicate the sending method of the SL PRS sent by themselves. The transmission resources and / or transmission method of PSCCH are related to the transmission resources of SL PRS, so that the PSCCH sent by different terminal devices to indicate the sending method of SL PRS can be multiplexed, thereby reducing the mutual interference between PSCCHs sent by different terminal devices, ensuring the reception of SL PRS by the receiving terminal device, and thus improving the positioning accuracy.

[0163] The following will illustrate the technical solution of this application through several embodiments. However, it should be noted that, in the absence of contradiction, the contents of different embodiments of this application can be arbitrarily combined to form new embodiments, which are all within the scope of protection of this application.

[0164] In an exemplary embodiment of the present application, within the dedicated resource pool of SL PRS, the bandwidth occupied by SL PRS is configured by the network or pre-configured or specified by the standard, and the PSCCH used to indicate that SL PRS is sent and the indicated SL PRS are located on adjacent OFDM symbols in the same time slot, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS.

[0165] In this embodiment, the bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard. For example, the bandwidth of the SL PRS is configured by the network, or pre-configured, or specified by the standard as the bandwidth of the SL PRS resource pool. The PSCCH indicating the transmission of the SL PRS and the indicated SL PRS are transmitted in adjacent OFDM symbols in the same time slot, wherein the bandwidth of the PSCCH may be equal to or less than the bandwidth of the indicated SL PRS, and the multiple OFDM symbols occupied by the above-mentioned PSCCH and the SL PRS indicated by it are called an SL PRS time domain resource. As shown in Figure 13, within an SL PRS time domain resource, the transmission power of a UE remains constant. In this embodiment, different UEs can occupy different REs within the same OFDM symbol to send SL PRS, that is, use different RE offsets, and the RE offsets allowed within the SL PRS time domain resources can be configured by the network, or pre-configured or specified by the standard. For example, assuming that the comb size of SL PRS is 2, UE#0 uses RE offset 0 and sends SL PRS in RE#0, #2, #4,..., while UE#1 uses RE offset 1 and sends SL PRS in RE#1, #3, #5,...

[0166] In this embodiment, within one SL PRS time domain resource, the PSCCHs sent by different UEs to indicate the SL PRS transmission mode occupy the same time-frequency resources, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS. For example:

[0167] Mode 1-1: The time-frequency position of the DMRS of the PSCCH sent by different UEs is the same, that is, for each RB occupied by the PSCCH, the RE position occupied by the DMRS is the same, but for the DMRS REs in the same RB, the OCC used is determined by the RE offset of the indicated SL PRS. Example:

[0168] For each RB occupied by the PSCCH, the DMRS of the PSCCH can occupy three REs in the RB, namely the 1st, 5th and 9th REs, as shown in Figure 14. In the SL PRS time domain resource, three different RE offsets are allowed, corresponding to RE offsets #0, #1 and #2, respectively. The DMRS of the PSCCH used to indicate the SL PRS using RE offset #0 adopts the mask {1,1,1}, that is, the OCC index #0 in Table 1; the DMRS of the PSCCH used to indicate the SL PRS using RE offset #1 adopts the mask {1,e j2 / 3π ,e -j2 / 3π}, that is, OCC index #1 in Table 1; the DMRS for indicating the PSCCH using the SL PRS with RE offset #2 uses the mask {1,e -j2 / 3π ,e j2 / 3π}, which is OCC index #2 in Table 1.

[0169] For each RB occupied by PSCCH, the DMRS of PSCCH can occupy 4 REs within the RB, and 4 different RE offsets are allowed in the SL PRS time domain resource. The DMRS of PSCCH used to indicate the SL PRS using the first RE offset uses the mask {1,1,1,1}, and the DMRS of PSCCH used to indicate the SL PRS using the second RE offset uses the mask {1,e j1 / π ,e jπ ,e -j1 / 2π}, used to indicate that the DMRS of the PSCCH of the SL PRS using the third RE offset uses the mask {1,e jπ ,1,e jπ}, used to indicate that the DMRS of the PSCCH of the SL PRS using the fourth RE offset adopts the mask {1,e -j1 / 2π ,e jπ ,e j1 / 2π}.

[0170] For each RB occupied by the PSCCH, the PSCCH DMRS can occupy X REs within the RB. The number of masks available for the PSCCH DMRS is also X, corresponding to indices #0, 1, ..., X-1, where X is a positive integer. Y RE offsets are allowed within the SL PRS time domain resource, corresponding to indices #0, 1, ..., Y-1, where Y is a positive integer. The PSCCH DMRS used to indicate the SL PRS using RE offset #i uses mask Y mod X, where mod represents the modulo operation and i is an integer less than or equal to Y.

[0171] Mode 1-2: The time-frequency position of the RE occupied by the PSCCH DMRS is determined by the RE offset of the SL PRS indicated by the PSCCH. In this mode, in order to ensure the accuracy of channel estimation, the UE cannot send PSCCH modulation symbols on REs that may be used to send PSCCH DMRS. The following is an example of determining the PSCCH DMRS based on the RE offset of the SL PRS in this mode:

[0172] For each RB occupied by the PSCCH, the PSCCH DMRS can occupy 3 REs within the RB, and Y different RE offsets are allowed within the SL PRS time domain resource, corresponding to RE offsets #0, #1, ...Y-1, where Y is a positive integer. Then:

[0173] - The DMRS of the PSCCH for indicating the SL PRS using RE offset #i occupies the 1st+i mod 12th, 4th+1+i mod 12th, and 8th+1+i mod 12th REs in the RB, where i is an integer less than or equal to Y. Or,

[0174] -The DMRS of the PSCCH used to indicate the SL PRS using RE offset #i occupies the i mod 12, 4th+i mod 12, and 8th+i mod 12 REs in the RB, where i is an integer less than or equal to Y.

[0175] For each RB occupied by the PSCCH, the PSCCH DMRS can occupy 4 REs within the RB, and Y different RE offsets are allowed within the SL PRS time domain resource, corresponding to RE offsets #0, #1, ...Y-1, where Y is a positive integer. Then:

[0176] -The DMRS of the PSCCH used to indicate the SL PRS using RE offset #i occupies the i mod 12th, 3rd + i mod 12th, 6th + i mod 12th, and 9th + i mod 12th REs in the RB, where i is an integer less than or equal to Y.

[0177] For each RB occupied by the PSCCH, the PSCCH DMRS can occupy X REs within the RB, while Y different RE offsets are allowed within the SL PRS time domain resources, corresponding to RE offsets #0, #1, ...Y-1, where Y is a positive integer. Then:

[0178] - The DMRS of the PSCCH for indicating the SL PRS with RE offset #i occupies s_0+i mod 12, s_1+i mod 12, ..., s_2+i mod 12, ..., s_3+i mod 12, ..., s_4+i mod 12, ..., s_5+i mod 12, ..., s_6+i mod 12, ..., s_7+i mod 12, ... X-1 +i mod 12 REs, where s_0,s_1,…,s X-1 is the initial DMRS RE index, which is configured by the network, or pre-configured, or specified by the standard, and i is an integer less than or equal to Y.

[0179] Mode 1-3: The time-frequency position of the RE occupied by the PSCCH DMRS is determined by the RE offset of the SL PRS indicated by the PSCCH. In this mode, to ensure the accuracy of channel estimation, the transmit power of the PSCCH DMRS on each RE can be higher than the transmit power of the PSCCH modulation symbol. For example, the power of the PSCCH DMRS on each RE is increased by 2dB relative to the transmit power of the PSCCH modulation symbol on each RE.

[0180] In an exemplary embodiment of the present application, within the dedicated resource pool of SL PRS, the bandwidth occupied by SL PRS is indicated by PSCCH, the PSCCH used to indicate that SL PRS is sent and the indicated SL PRS are sent on adjacent OFDM symbols in the same time slot, and the DMRS of PSCCH is related to the RE offset of the indicated SL PRS.

[0181] In this embodiment, the bandwidth occupied by the SL PRS is less than or equal to the bandwidth of the resource pool where the SL PRS is located. The bandwidth occupied by the SL PRS is indicated by the PSCCH. The bandwidth occupied by the SL PRS includes one or more subchannels, and each subchannel includes one or more PRBs or IRBs. The number of PRBs or IRBs included is configured by the network, or pre-configured, or specified by the standard. The PSCCH sent by the SL PRS and the indicated SL PRS are sent in adjacent OFDM symbols in the same time slot, wherein the bandwidth of the PSCCH is equal to or less than one subchannel. For example, the frequency domain resources occupied by the PSCCH are the first subchannel occupied by the SL PRS. The multiple OFDM symbols occupied by the above-mentioned PSCCH and the SL PRS indicated by it are called an SL PRS time domain resource. As shown in Figure 15, within an SL PRS time domain resource, the transmission power of a UE remains constant. In this embodiment, the UE can occupy different REs within the same OFDM symbol to send the SL PRS, that is, use different RE offsets. The RE offsets allowed in the SL PRS time domain resources can be configured by the network, or pre-configured, or specified by the standard. For example, assuming that the comb size of SL PRS is 2, UE#0 uses RE offset 0 and sends SL PRS in RE#0, #2, #4,..., while UE#1 uses RE offset 1 and sends SL PRS in RE#1, #3, #5,...

[0182] In this embodiment, within one SL PRS time domain resource, the PSCCH indicating the SL PRS occupies the same time-frequency resource, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS. For specific examples, see methods 1-1 to 1-3 described above.

[0183] In an exemplary embodiment of the present application, within the dedicated resource pool of SL PRS, the bandwidth occupied by SL PRS is network configured, pre-configured, or specified by the standard. The PSCCH used to indicate that SL PRS is sent and the indicated SL PRS are located on adjacent OFDM symbols in the same time slot. The frequency domain position of the PSCCH is related to the RE offset of the indicated SL PRS.

[0184] In this embodiment, the bandwidth occupied by SL PRS is configured by the network, or pre-configured, or specified by the standard. For example, the bandwidth of SL PRS is configured by the network, or pre-configured, or specified by the standard as the bandwidth of the SL PRS resource pool. The PSCCH indicating the transmission of SL PRS and the indicated SL PRS are transmitted in adjacent OFDM symbols in the same time slot, and the multiple OFDM symbols used for SL PRS and PSCCH transmission are called an SL PRS time domain resource. Among them, the bandwidth of PSCCH can be equal to or less than the bandwidth of the indicated SL PRS. For example, the bandwidth of PSCCH is equal to floor(B / Y), where B is the number of RBs occupied by SL PRS, which is configured by the network, or pre-configured, or specified by the standard, and Y is the number of RE offsets allowed in the SL PRS time domain resource, corresponding to indexes #0, #1, ..., #Y-1, respectively, and floor() means rounding down. In the OFDM symbol used for PSCCH transmission, starting from the starting point of the bandwidth occupied by SL PRS, each B / Y RB is called a PSCCH resource. There are Y PSCCHs in the SL PRS time domain resource, corresponding to indexes #0, #1,…, #Y-1 respectively. The PSCCH sent on the PSCCH resource with index #i is used to indicate the SL PRS sent using RE index #i.

[0185] An example is shown in Figure 16, where there are 3 PSCCH resources within the SL PRS time domain resources. According to the network configuration, or pre-configuration, or standard definition, 3 RE offsets are allowed within the SL PRS resources. The RE offset indexes used by the SL PRS indicated by the PSCCH sent on PSCCH resources #0, #1 or #2 are #0, #1 and #2 respectively.

[0186] In an exemplary embodiment of the present application, in the dedicated resource pool of SL PRS, the PSCCH used to indicate SL PRS transmission and the indicated SL PRS are located in the same time slot, and the frequency domain position of the PSCCH and the time domain position of the indicated SL PRS are related to the RE offset.

[0187] In this embodiment, there are one or more specific OFDM symbols in the time slot for sending PSCCH, and there are multiple PSCCH resources on the one or more specific OFDM symbols, each PSCCH resource occupies a specific RB or IRB. In addition, there are one or more SL PRS time domain resources in the time slot, and the SL PRS time domain resources are only used to send SL PRS. According to network configuration, or pre-configuration, or standard regulations, the SL PRS sent in each SL PRS time domain resource can use one or more different RE offsets.

[0188] The PSCCH indicating the transmission of SL PRS and the indicated SL PRS are transmitted in the same time slot. The bandwidth of the PSCCH may be equal to or less than the bandwidth of the indicated SL PRS, for example, the bandwidth of the PSCCH is equal to floor(B / Y), where B is the number of RBs or IRBs occupied by SL PRS, or the number of RBs or IRBs contained in the resource pool where SL PRS is located, which is configured by the network, or pre-configured, or specified by the standard, and Y is the number of RE offsets allowed in the SL PRS time domain resource, corresponding to indexes #0, #1, ..., #Y-1, respectively, and floor() represents rounding down. In the OFDM symbol used for PSCCH transmission, starting from the starting point of the bandwidth occupied by SL PRS, each B / Y RB or IRB is called a PSCCH resource, and there are Y PSCCHs in the SL PRS time domain resource, corresponding to indexes #0, #1, ..., #Y-1, respectively. The PSCCH transmitted on the PSCCH resource with index #i is used to indicate the SL PRS transmitted using RE index #i.

[0189] An example is shown in Figure 17, where six PSCCH resources are configured in a time slot, each of which occupies a different RB or IRB, corresponding to indexes #0, #1, ..., #5. Three SL PRS time domain resources are configured in the same time slot, and two different RE offsets are allowed in each SL PRS time domain resource, so there are a total of six SL PRS resources in the time slot. The six SL PRS resources in the time slot can be sorted in one of the following two ways based on network configuration, pre-configuration, or standard requirements:

[0190] Method 1: The 6 SL PRS resources are sorted in the order of RE offset first and then time domain resource index, that is, the SL PRS resource with the first RE offset within SL PRS time domain resource #0 is index #0, the SL PRS resource with the second RE offset within SL PRS time domain resource #0 is index #1, the SL PRS resource with the first RE offset within SL PRS time domain resource #1 is index #2, and so on.

[0191] Method 2: The 6 SL PRS resources are sorted in the order of time domain resource index first and then RE offset, that is, the SL PRS resource with the first RE offset within SL PRS time domain resource #0 is index #0, the SL PRS resource with the first RE offset within SL PRS time domain resource #1 is index #1, the SL PRS resource with the first RE offset within SL PRS time domain resource #2 is index #2, the SL PRS resource with the second RE offset within SL PRS time domain resource #0 is index #3, and so on.

[0192] The PSCCH transmitted on PSCCH resource #i indicates SL PRS transmission on SL PRS resource #i.

[0193] In an exemplary embodiment of the present application, in a shared resource pool for SL PRS and SL communications, the bandwidth occupied by SL PRS is configured by the network, or pre-configured, or specified by the standard, and the PSCCH used to indicate that the SL PRS sends and the indicated SL PRS are located in adjacent OFDM symbols in the same time slot, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS.

[0194] In this embodiment, the bandwidth occupied by the SL PRS and the OFDM symbols occupied in a time slot are configured by the network, or pre-configured, or specified by the standard. For example, the bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard as the bandwidth of the resource pool where the SL PRS is located, and the OFDM symbols occupied by the SL PRS in a time slot are configured by the network, or pre-configured, or specified by the standard as the OFDM symbols that can be used for SL transmission on the SL BWP where the SL PRS is located. The bandwidth and OFDM symbols constitute an SL PRS resource. Within the SL PRS resource, the PSCCH used to indicate that the SL PRS is sending occupies part of the OFDM symbols in the first subchannel within an SL PRS resource. Each subchannel contains one or more PRBs or IRBs. The number of PRBs or IRBs contained is configured by the network, or pre-configured, or specified by the standard. The part of the OFDM symbols is configured by the network, or pre-configured, or specified by the standard. As shown in Figure 18.

[0195] In this embodiment, within one SL PRS time domain resource, the PSCCH indicating the SL PRS occupies the same time-frequency resource, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS. For example:

[0196] For each RB occupied by PSCCH, the RE position occupied by DMRS is the same, but for DMRS REs within the same RB, the OCC used is determined by the RE offset of the indicated SL PRS.

[0197] For each RB occupied by the PSCCH, the DMRS of the PSCCH can occupy three REs in the RB, namely the 1st, 5th and 9th REs, as shown in Figure 14. In the SL PRS time domain resource, three different RE offsets are allowed, corresponding to RE offsets #0, #1, ..., respectively. The DMRS of the PSCCH used to indicate the SL PRS using RE offset #0 adopts the mask {1,1,1}, that is, the OCC index #0 in Table 1; the DMRS of the PSCCH used to indicate the SL PRS using RE offset #1 adopts the mask {1,ej2 / 3π ,e -j2 / 3π}, that is, OCC index #1 in Table 1; the DMRS for indicating the PSCCH using the SL PRS with RE offset #2 uses the mask {1,e -j2 / 3π ,e j2 / 3π}, which is OCC index #2 in Table 1.

[0198] For each RB occupied by the PSCCH, the PSCCH DMRS can occupy X REs within the RB. The number of masks available for the PSCCH DMRS is also X, corresponding to indices #0, 1, ..., X-1, where X is a positive integer. Y RE offsets are allowed within the SL PRS time domain resource, corresponding to indices #0, 1, ..., Y-1, where Y is a positive integer indicating that the PSCCH DMRS for the SL PRS using RE offset #i uses mask Y mod X, where mod represents the modulo operation and i is an integer less than or equal to Y.

[0199] Optionally, the number of SL PRS RE offsets allowed within one SL PRS resource should be less than or equal to 3.

[0200] In an exemplary embodiment of the present application, in the shared resource pool of SL PRS and SL communication, the bandwidth occupied by SL PRS is indicated by PSCCH, the PSCCH used to indicate that SL PRS is sent and the indicated SL PRS are located in adjacent OFDM symbols in the same time slot, and the DMRS of PSCCH is related to the RE offset of the indicated SL PRS.

[0201] In this embodiment, the minimum bandwidth occupied by the SL PRS and the OFDM symbols occupied in a time slot are configured by the network, or pre-configured, or specified by the standard. For example, the minimum bandwidth occupied by the SL PRS is configured by the network, or pre-configured or specified by the standard as one or more sub-channels, and the OFDM symbols occupied by the SL PRS in a time slot are configured by the network, or pre-configured, or specified by the standard as OFDM symbols that can be used for SL transmission on the SL BWP where the SL PRS is located. The minimum bandwidth and OFDM symbols constitute an SL PRS resource. Within the SL PRS resource, the PSCCH used to indicate that the SL PRS is sending occupies part of the OFDM symbols in the first sub-channel within an SL PRS resource. Each sub-channel contains one or more PRBs or IRBs. The number of PRBs or IRBs contained is configured by the network, or pre-configured, or specified by the standard. The part of the OFDM symbols is configured by the network, or pre-configured, or specified by the standard.

[0202] According to the first implementation of this embodiment, within one SL PRS time domain resource, the PSCCH indicating the SL PRS occupies the same time-frequency resource, and the DMRS of the PSCCH is related to the RE offset of the indicated SL PRS. For example:

[0203] For each RB occupied by PSCCH, the RE position occupied by DMRS is the same, but for DMRS REs within the same RB, the adopted OCC is determined by the indicated RE offset of SL PRS.

[0204] According to the second implementation of this embodiment, within one SL PRS time domain resource, the PSCCH indicating the SL PRS occupies different frequency domain resources. For example:

[0205] For PSCCH indicating SL PRS with different RE offsets, different sub-channels within the SL PRS resources are occupied. For example:

[0206] An SL PRS resource contains X subchannels, corresponding to indices #0, 1, ..., X-1. The SL PRS time domain resource allows Y RE offsets, corresponding to indices #0, 1, ..., Y-1. The PSCCH used to indicate the SL PRS using RE offset #i uses subchannel Y mod X, where mod represents a modulo operation. An example is shown in Figure 19, where an SL PRS resource contains two subchannels and allows two RE offsets. For an SL PRS using RE offset #0, the PSCCH used for indication is sent on subchannel #0, and for an SL PRS using RE offset #1, the PSCCH used for indication is sent on subchannel #1.

[0207] The UE's transmit power in different OFDM symbols within one SL PRS resource should remain constant.

[0208] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0209] Please refer to Figure 20, which shows a block diagram of a sideline communication device provided by one embodiment of the present application. This device has the functionality to implement the above-described sideline communication method. This functionality can be implemented via hardware or by hardware executing corresponding software. This device can be the terminal device described above, or it can be provided within a terminal device. As shown in Figure 20, the device 2000 may include: a transmission module 2010.

[0210] The transmission module 2010 is used to send or receive PSCCH, where the PSCCH is used to indicate the transmission method of the SL PRS, and the transmission resources and / or transmission method of the PSCCH are related to the transmission resources of the SL PRS.

[0211] In some embodiments, the transmission resource and / or transmission mode of the PSCCH includes: the OCC of the demodulation reference signal DMRS of the PSCCH.

[0212] In some embodiments, the OCC of the DMRS of the PSCCH is related to the transmission resources of the SL PRS.

[0213] In some embodiments, the transmission resources and / or transmission mode of the PSCCH include: the time-frequency position of the DMRS of the PSCCH.

[0214] In some embodiments, the time-frequency position of the DMRS of the PSCCH is related to the transmission resource of the SL PRS.

[0215] In some embodiments, the modulation symbol of the PSCCH cannot be sent at the time-frequency position of the DMRS that can be used to send the PSCCH; and / or the transmission power of the DMRS of the PSCCH is greater than the transmission power of the modulation symbol of the PSCCH.

[0216] In some embodiments, the transmission resources and / or transmission mode of the PSCCH include: the frequency domain position of the PSCCH.

[0217] In some embodiments, the frequency domain position of the PSCCH is related to the transmission resource of the SL PRS.

[0218] In some embodiments, the transmission resource of the SL PRS includes: the time domain position and / or frequency domain position of the SL PRS.

[0219] In some embodiments, the frequency domain position of the SL PRS is related to the RE offset of the SL PRS.

[0220] In some embodiments, the PSCCH and the SL PRS are located in adjacent OFDM symbols of the same time slot.

[0221] In some embodiments, the bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard, or indicated by the PSCCH.

[0222] In some embodiments, the bandwidth of the PSCCH is less than or equal to the bandwidth of the SL PRS.

[0223] In some embodiments, the bandwidth of the SL PRS includes at least one subchannel, each subchannel includes at least one PRB or IRB, and the bandwidth of the PSCCH is less than or equal to one subchannel.

[0224] In some embodiments, the bandwidth of the PSCCH is equal to floor(B / Y), where B is the number of PRBs or IRBs occupied by the SL PRS, or B is the number of PRBs or IRBs contained in the SL PRS resource pool, and Y is the number of RE offsets allowed in the time domain resources of the SL PRS, and floor() means rounding down.

[0225] In some embodiments, within one SL PRS time domain resource, the transmission power remains constant; wherein, the one SL PRS time domain resource includes: the time domain resource occupied by the PSCCH and the time domain resource occupied by the SL PRS.

[0226] In some embodiments, the one SL PRS time domain resource also includes: a time domain resource occupied by an automatic gain control AGC.

[0227] In some embodiments, the transmission resources of the SL PRS are determined from a dedicated resource pool of the SL PRS.

[0228] In some embodiments, the transmission resources of the SL PRS are determined from a shared resource pool for communication between the SL PRS and the SL.

[0229] In some embodiments, the SL PRS is sent in at least one of the following ways:

[0230] One or more time slots where the SL PRS is located;

[0231] One or more OFDM symbols occupied by the SL PRS in the time slot;

[0232] The PRB or IRB occupied by the SL PRS on one or more OFDM symbols;

[0233] REs occupied by the SL PRS in one or more OFDM symbols;

[0234] the repetition period of the SL PRS;

[0235] The receiving terminal ID information of the SL PRS;

[0236] The sending terminal ID information of the SL PRS;

[0237] Sequence information of the SL PRS.

[0238] It should be noted that, when the device provided in the above embodiment realizes its function, it only uses the division of the above-mentioned functional modules as an example. In actual application, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0239] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here. For details not described in detail in the embodiment of the device, reference can be made to the above method embodiment.

[0240] Please refer to FIG21 , which shows a schematic diagram of the structure of a terminal device provided by an embodiment of the present application. The terminal device 2100 may include: a processor 2101 , a transceiver 2102 , and a memory 2103 .

[0241] The processor 2101 includes one or more processing cores. The processor 2101 executes various functional applications and information processing by running software programs and modules.

[0242] The transceiver 2102 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0243] The memory 2103 may be connected to the processor 2101 and the transceiver 2102 .

[0244] The memory 2103 may be used to store a computer program executed by the processor, and the processor 2101 is used to execute the computer program to implement each step in the above method embodiment.

[0245] In an exemplary embodiment, the processor 2101 is used to control the transceiver 2102 to send or receive PSCCH, where the PSCCH is used to indicate the transmission method of the SL PRS, and the transmission resources and / or transmission method of the PSCCH are related to the transmission resources of the SL PRS.

[0246] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0247] In addition, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0248] An embodiment of the present application also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is used to be executed by a processor to implement the above-mentioned side communication method. Optionally, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives) or an optical disk, etc. Among them, the random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0249] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions, and when the chip is running, is used to implement the above-mentioned side communication method.

[0250] An embodiment of the present application also provides a computer program product, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned side communication method.

[0251] It should 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. For example, "A indicates B" 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 between A and B.

[0252] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0253] In some embodiments of the present application, "predefined" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0254] In some embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, a NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0255] In this document, "plurality" refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0256] The term “greater than or equal to” mentioned herein may mean greater than or equal to, or greater than, and the term “less than or equal to” may mean less than or equal to, or less than.

[0257] In addition, the step numbers described in this document only illustrate a possible execution order between the steps. In some other embodiments, the above steps may not be executed in the order of the numbers, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in the opposite order of the diagram. The embodiments of the present application are not limited to this.

[0258] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0259] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A side communication method, characterized in that: The method is performed by a terminal device, and the method includes: A physical sidelink control channel PSCCH is sent or received, wherein the PSCCH is used to indicate a sending method of a sidelink positioning reference signal SL PRS, and a transmission resource and / or transmission method of the PSCCH is related to a transmission resource of the SL PRS.

2. The method according to claim 1, characterized in that The transmission resource and / or transmission mode of the PSCCH includes: an orthogonal mask code OCC of a demodulation reference signal DMRS of the PSCCH.

3. The method according to claim 2, characterized in that The OCC of the DMRS of the PSCCH is related to the transmission resources of the SL PRS.

4. The method according to claim 1, characterized in that: The transmission resource and / or transmission mode of the PSCCH includes: the time-frequency position of the DMRS of the PSCCH.

5. The method according to claim 4, characterized in that The time-frequency position of the DMRS of the PSCCH is related to the transmission resource of the SL PRS.

6. The method according to any one of claims 2 to 5, characterized in that: At the time-frequency position of the DMRS that can be used to send the PSCCH, the terminal device cannot send the modulation symbol of the PSCCH; and / or, The transmission power of the DMRS of the PSCCH is greater than the transmission power of the modulation symbol of the PSCCH.

7. The method according to claim 1, characterized in that The transmission resource and / or transmission mode of the PSCCH includes: the frequency domain position of the PSCCH.

8. The method according to claim 7, characterized in that The frequency domain position of the PSCCH is related to the transmission resource of the SL PRS.

9. The method according to any one of claims 1 to 8, characterized in that: The transmission resource of the SL PRS includes: the time domain position and / or frequency domain position of the SL PRS.

10. The method according to claim 9, characterized in that The frequency domain position of the SL PRS is related to the resource element RE offset of the SL PRS.

11. The method according to any one of claims 1 to 10, characterized in that: The PSCCH and the SL PRS are located in adjacent orthogonal frequency division multiplexing OFDM symbols in the same time slot.

12. The method according to any one of claims 1 to 11, characterized in that: The bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard, or indicated by the PSCCH.

13. The method according to any one of claims 1 to 12, characterized in that: The bandwidth of the PSCCH is less than or equal to the bandwidth of the SL PRS.

14. The method according to claim 13, characterized in that The bandwidth of the SL PRS includes at least one subchannel, each subchannel includes at least one physical resource block PRB or interleaved resource block IRB, and the bandwidth of the PSCCH is less than or equal to one subchannel.

15. The method according to claim 13, characterized in that The bandwidth of the PSCCH is equal to floor(B / Y), where B is the number of PRBs or IRBs occupied by the SL PRS, or B is the number of PRBs or IRBs contained in the SL PRS resource pool, Y is the number of RE offsets allowed in the time domain resources of the SL PRS, and floor() means rounding down.

16. The method according to any one of claims 1 to 15, characterized in that Within one SL PRS time domain resource, the transmission power of the terminal device remains constant; wherein, the one SL PRS time domain resource includes: the time domain resources occupied by the PSCCH and the time domain resources occupied by the SL PRS.

17. The method according to claim 16, characterized in that The one SL PRS time domain resource also includes: a time domain resource occupied by an automatic gain control AGC.

18. The method according to any one of claims 1 to 17, characterized in that The transmission resources of the SL PRS are determined from a dedicated resource pool of the SL PRS.

19. The method according to any one of claims 1 to 17, characterized in that The transmission resources of the SL PRS are determined from a shared resource pool for communication between the SL PRS and the SL.

20. The method according to any one of claims 1 to 19, characterized in that The SL PRS is sent in at least one of the following ways: One or more time slots where the SL PRS is located; One or more OFDM symbols occupied by the SL PRS in the time slot; The PRB or IRB occupied by the SL PRS in one or more OFDM symbols; REs occupied by the SL PRS in one or more OFDM symbols; a repetition period of the SL PRS; The receiving terminal ID information of the SL PRS; The sending terminal ID information of the SL PRS; Sequence information of the SL PRS.

21. A side communication device, characterized in that: The device comprises: The transmission module is used to send or receive a physical side control channel PSCCH, where the PSCCH is used to indicate a transmission method of a side positioning reference signal SL PRS, and the transmission resources and / or transmission method of the PSCCH are related to the transmission resources of the SL PRS.

22. The device according to claim 21, characterized in that The transmission resource and / or transmission mode of the PSCCH includes: an orthogonal mask code OCC of a demodulation reference signal DMRS of the PSCCH.

23. The device according to claim 22, characterized in that The OCC of the DMRS of the PSCCH is related to the transmission resources of the SL PRS.

24. The device according to claim 21, characterized in that The transmission resource and / or transmission mode of the PSCCH includes: the time-frequency position of the DMRS of the PSCCH.

25. The device according to claim 24, characterized in that The time-frequency position of the DMRS of the PSCCH is related to the transmission resource of the SL PRS.

26. The device according to any one of claims 22 to 25, characterized in that At the time-frequency position of the DMRS that can be used to send the PSCCH, the modulation symbol of the PSCCH cannot be sent; and / or, The transmission power of the DMRS of the PSCCH is greater than the transmission power of the modulation symbol of the PSCCH.

27. The device according to claim 21, characterized in that The transmission resource and / or transmission mode of the PSCCH includes: the frequency domain position of the PSCCH.

28. The device according to claim 27, characterized in that The frequency domain position of the PSCCH is related to the transmission resource of the SL PRS.

29. The device according to any one of claims 21 to 28, characterized in that The transmission resource of the SL PRS includes: the time domain position and / or frequency domain position of the SL PRS.

30. The device according to claim 29, characterized in that The frequency domain position of the SL PRS is related to the resource element RE offset of the SL PRS.

31. The device according to any one of claims 21 to 30, characterized in that The PSCCH and the SL PRS are located in adjacent orthogonal frequency division multiplexing OFDM symbols in the same time slot.

32. The device according to any one of claims 21 to 31, characterized in that The bandwidth occupied by the SL PRS is configured by the network, or pre-configured, or specified by the standard, or indicated by the PSCCH.

33. The device according to any one of claims 21 to 32, characterized in that The bandwidth of the PSCCH is less than or equal to the bandwidth of the SL PRS.

34. The device according to claim 33, characterized in that The bandwidth of the SL PRS includes at least one subchannel, each subchannel includes at least one physical resource block PRB or interleaved resource block IRB, and the bandwidth of the PSCCH is less than or equal to one subchannel.

35. The device according to claim 33, characterized in that The bandwidth of the PSCCH is equal to floor(B / Y), where B is the number of PRBs or IRBs occupied by the SL PRS, or B is the number of PRBs or IRBs contained in the SL PRS resource pool, Y is the number of RE offsets allowed in the time domain resources of the SL PRS, and floor() means rounding down.

36. The device according to any one of claims 21 to 35, characterized in that Within one SL PRS time domain resource, the transmission power remains constant; wherein the one SL PRS time domain resource includes: the time domain resources occupied by the PSCCH and the time domain resources occupied by the SL PRS.

37. The device according to claim 36, characterized in that The one SL PRS time domain resource also includes: a time domain resource occupied by an automatic gain control AGC.

38. The device according to any one of claims 21 to 37, characterized in that The transmission resources of the SL PRS are determined from a dedicated resource pool of the SL PRS.

39. The device according to any one of claims 21 to 37, characterized in that The transmission resources of the SL PRS are determined from a shared resource pool for communication between the SL PRS and the SL.

40. The device according to any one of claims 21 to 39, characterized in that The SL PRS is sent in at least one of the following ways: One or more time slots where the SL PRS is located; One or more OFDM symbols occupied by the SL PRS in the time slot; The PRB or IRB occupied by the SL PRS in one or more OFDM symbols; REs occupied by the SL PRS in one or more OFDM symbols; a repetition period of the SL PRS; The receiving terminal ID information of the SL PRS; The sending terminal ID information of the SL PRS; Sequence information of the SL PRS.

41. A terminal device, characterized in that: The terminal device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 20.

42. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 20.

43. A chip, characterized in that: The chip comprises a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the method according to any one of claims 1 to 20.

44. A computer program product, characterized in that The computer program product comprises computer instructions, which are stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the method according to any one of claims 1 to 20.

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