Communication method, terminal equipment and network equipment

Abstract

The invention provides a communication method, terminal equipment and network equipment. The method comprises the following steps: a first terminal device receives first information sent by a network device; wherein the first information is used for indicating resources used for SL PRS transmission. The first terminal device may be a terminal device that transmits the SL PRS. By receiving the first information, the first terminal device can obtain the resource for sending the SL PRS, thereby accurately sending the SL PRS.

Description

Communication method, terminal device, and network device Technical Field

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

[0002] In order to improve positioning accuracy, relevant technologies have studied the sidelink positioning reference signal (SL PRS). It is difficult for terminal devices to determine the resources used for sending SL PRS, making it difficult to achieve accurate transmission of SL PRS. For example, when a network device allocates resources for sending SL PRS, the sending terminal device of SL PRS cannot determine the resources allocated by the network device, resulting in the sending terminal device being unable to send SL PRS. For the receiving terminal device of SL PRS, since it is impossible to determine the resources used for sending SL PRS, it is impossible to accurately receive SL PRS.

[0003] Summary of the Invention

[0004] The present application provides a communication method, a terminal device, and a network device. The following introduces various aspects of the present application.

[0005] In a first aspect, a communication method is provided, comprising: a first terminal device receiving first information sent by a network device, wherein the first information is used to indicate resources used for SL PRS transmission.

[0006] In a second aspect, a communication method is provided, comprising: a first terminal device sending second information to a second terminal device, wherein the second information is used to indicate resources used for SL PRS transmission.

[0007] According to a third aspect, a communication method is provided, comprising: a network device sending first information to a first terminal device, wherein the first information is used to indicate resources used for SL PRS transmission.

[0008] In a fourth aspect, a communication method is provided, wherein the method includes: a second communication device receives second information sent by a first communication device, where the second information is used to indicate resources used for SL PRS transmission.

[0009] In a fifth aspect, a terminal device is provided, which is a first terminal device, and the terminal device includes: a first receiving unit, used to receive first information sent by a network device; wherein the first information is used to indicate resources used for SL PRS sending.

[0010] In a sixth aspect, a terminal device is provided, which is a first terminal device, and the terminal device includes: a first sending unit, used to send second information to a second terminal device; wherein the second information is used to indicate resources used for SL PRS sending.

[0011] In the seventh aspect, a network device is provided, including: a second sending unit, used to send first information to a first terminal device; wherein the first information is used to indicate resources used for sending a side positioning reference signal SL PRS.

[0012] In the eighth aspect, a terminal device is provided, which is a second terminal device, and the terminal device includes: a second receiving unit, used to receive second information sent by the first terminal device; wherein the second information is used to indicate resources used for sending a side positioning reference signal SL PRS.

[0013] In the ninth aspect, a terminal device is provided, comprising a processor and a memory, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of one or more aspects of the first aspect, the second aspect, and the fourth aspect.

[0014] In the tenth aspect, a network device is provided, comprising a processor, a memory, and a transceiver, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the network device executes part or all of the steps in the method of the third aspect.

[0015] In an eleventh aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0016] In the twelfth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables the terminal device and / or network device to execute part or all of the steps in the methods of the above aspects.

[0017] In a thirteenth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a terminal device and / or a network device to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0018] In the fourteenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0019] The first terminal device may be a terminal device that sends an SL PRS. By receiving the first information, the first terminal device can obtain resources used for sending the SL PRS, thereby accurately sending the SL PRS. The second terminal device may be a terminal device that receives the SL PRS. By receiving the second information, the second terminal device can obtain resources used for sending the SL PRS, thereby accurately receiving the SL PRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of a wireless communication system used in an embodiment of the present application.

[0021] FIG2 is an example diagram of a time slot for sideline communication used in an embodiment of the present application.

[0022] FIG3 is an example diagram of another time slot for sideline communication used in an embodiment of the present application.

[0023] FIG4 is an example diagram of another time slot for sideline communication used in an embodiment of the present application.

[0024] FIG5 is an example diagram of a single-symbol DMRS frequency domain type 1. FIG.

[0025] FIG6 is an example diagram of a PSCCH and PSSCH resource pool in NR-V2X.

[0026] FIG7 is a diagram showing an example of a subframe of an NR system.

[0027] FIG8 is an example diagram of a process for determining sideways time domain resources.

[0028] FIG9 is a schematic flowchart of a communication method provided in an embodiment of the present application.

[0029] FIG10 is a schematic flowchart of another communication method provided in an embodiment of the present application.

[0030] FIG11 is an example diagram of an SL PRS resource division method provided in an embodiment of the present application.

[0031] FIG12 is an example diagram of another SL PRS resource division method provided in an embodiment of the present application.

[0032] FIG13 is a schematic diagram of resources occupied by a PSCCH and SL PRS provided in an embodiment of the present application.

[0033] FIG14 is a schematic diagram of resources occupied by a PSCCH and SL PRS provided in an embodiment of the present application.

[0034] FIG15 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

[0035] FIG16 is a schematic structural diagram of another terminal device provided in an embodiment of the present application.

[0036] FIG17 is a schematic structural diagram of a network device provided in an embodiment of the present application.

[0037] Figure 18 is a schematic structural diagram of another terminal device provided in an embodiment of the present application.

[0038] FIG19 is a schematic structural diagram of a device for communication provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solution of this application will be described below with reference to the accompanying drawings. For ease of understanding, the following first introduces the terms and communication processes involved in this application with reference to Figures 1 to 7.

[0040] Communication System

[0041] Figure 1 shows a wireless communication system 100 applicable to an embodiment of the present application. The wireless communication system 100 may include a network device 110 and terminals 121 to 129. The network device 110 may provide communication coverage for a specific geographical area and may communicate with terminals within the coverage area.

[0042] In some implementations, terminals may communicate with each other via a sidelink (SL). Sidelink communication may also be referred to as proximity services (ProSe) communication, unilateral communication, sidelink communication, device-to-device (D2D) communication, or direct link communication.

[0043] In other words, sidelink data is transmitted between terminals via a sidelink. The sidelink data may include data and / or control signaling. In some implementations, the sidelink data may be, for example, a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), a PSCCH demodulation reference signal (DMRS), a PSSCH DMRS, a physical sidelink feedback channel (PSFCH), a sidelink synchronization signal block (S-SSB), a channel state information reference signal (CSI-RS), a phase tracking reference signal (PT-RS), etc., wherein the S-SSB includes a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH).

[0044] The following describes several common sidelink communication scenarios using Figure 1. Sidelink communication can be categorized into three scenarios, depending on whether the terminal in the sidelink is within the coverage of the network device. Scenario 1: The terminal conducts sidelink communication within the coverage of the network device. Scenario 2: Some terminals conduct sidelink communication within the coverage of the network device. Scenario 3: The terminal conducts sidelink communication outside the coverage of the network device.

[0045] As shown in Figure 1, in scenario 1, terminals 121-122 can communicate via a sidelink, and terminals 121-122 are all within the coverage of network device 110, or in other words, terminals 121-122 are all within the coverage of the same network device 110. In this scenario, network device 110 can send configuration signaling to terminals 121-122, and accordingly, terminals 121-122 communicate via the sidelink based on the configuration signaling.

[0046] As shown in Figure 1, in scenario 2, terminals 123 and 124 can communicate via a sidelink, and terminal 123 is within the coverage of network device 110, while terminal 124 is outside the coverage of network device 110. In this scenario, terminal 123 receives configuration information from network device 110 and communicates via a sidelink based on the configuration of the configuration signaling. However, for terminal 124, since terminal 124 is outside the coverage of network device 110, it cannot receive the configuration information of network device 110. In this case, terminal 124 can obtain the configuration of the sidelink communication based on the configuration information according to pre-configuration and / or the configuration information sent by terminal 123 within the coverage area, so as to communicate with terminal 123 via the sidelink based on the obtained configuration.

[0047] In some cases, terminal 123 may send the above configuration information to terminal 124 via a physical sidelink broadcast channel (PSBCH) to configure terminal 124 to communicate via the sidelink.

[0048] As shown in Figure 1, in scenario 3, terminals 125-129 are all outside the coverage of network device 110 and cannot communicate with network device 110. In this case, the terminals can configure sidelink communication based on pre-configuration information.

[0049] In some cases, terminals 127-129 located outside the coverage area of ​​the network device can form a communication group, and the terminals 127-129 in the communication group can communicate with each other. In addition, terminal 127 in the communication group can serve as a central control node, also known as a cluster header (CH), and correspondingly, the terminals in other communication groups can be called "group members."

[0050] Terminal 127 as a CH may have one or more of the following functions: responsible for establishing a communication group; joining and leaving group members; coordinating resources, allocating side transmission resources to group members, receiving side transmission feedback information from group members; coordinating resources with other communication groups, etc.

[0051] It should be noted that Figure 1 exemplarily shows a network device and multiple terminal devices. Optionally, the wireless communication system 100 may include multiple network devices and the coverage range of each network device may include other numbers of terminal devices. This embodiment of the present application does not limit this.

[0052] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0053] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0054] The terminal in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal device, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides side traffic data between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using side traffic data. The cellular phone and smart home devices communicate with each other without relaying the communication signal through a base station.

[0055] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and the network device may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may indicate a radio access network (RAN) node (or device) that connects the terminal device to a wireless network. A base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. A base station can also refer to a communication module, a modem or a chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0056] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0057] In some deployments, the network device in the embodiments of the present application may indicate a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0058] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0059] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0060] Time slot structure for sidelink communication

[0061] The following describes the time slot structure of the sidelink communication applicable to the embodiment of the present application in conjunction with Figures 2 to 3.

[0062] In some sidelink communication systems (such as NR-V2X), PSSCH can be transmitted in the same time slot as its associated PSCCH. Among them, PSCCH can occupy 2 or 3 time domain symbols. The time domain resource allocation of these sidelink communication systems can be based on the allocation granularity of time slots. The starting point and length of the time domain symbol used for sidelink transmission in a time slot can be configured by the parameters starting symbol position (sl-startSLsymbol) and number of symbols (sl-lengthSLsymbols). The last symbol in the symbols used for sidelink transmission is the guard period (GP) symbol. PSSCH and PSCCH can only use time domain symbols other than GP 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 automatic gain control (AGC) and GP symbols before the symbol.

[0063] As shown in Figure 2, the network configuration sl-StartSymbol = 3 and sl-LengthSymbols = 11. This means that the 11 time-domain symbols starting from symbol index 3 in a time slot can be used for sidelink transmission. The time slot shown in Figure 2 contains PSFCH transmission resources. This PSFCH occupies symbols 11 and 12, with symbol 11 being used as the AGC symbol for the PSFCH. Symbols 10 and 13 are used as GPs, respectively. The time-domain symbols available for PSSCH transmission are symbols 3 to 9. The PSCCH occupies three time-domain symbols: symbols 3, 4, and 5. Symbol 3 is typically the AGC symbol.

[0064] In addition to PSCCH and PSSCH, a sideline time slot may also contain PSFCH. Figure 3 is an example of a time slot structure including PSFCH. As shown in Figure 3, in a time slot, the first OFDM symbol is fixedly used for AGC. On the AGC symbol, the terminal device can copy the information sent on the second symbol. At the end of the time slot, there is a symbol reserved for transceiver conversion, which is used for the terminal device to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sideline symbol. In the frequency domain, the number of PRBs occupied by PSCCH is within the subband range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a PSSCH subchannel, or the frequency domain resources of PSSCH include multiple subchannels, then PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol where PSCCH is located.

[0065] Some sideline communication systems (such as NR-V2X systems) use multiple time-domain PSSCH DMRS patterns, which draws on the design of the NR system Uu interface. Within a resource pool, the number of available DMRS patterns can be 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 1. Figure 4 shows a schematic diagram of the time-domain position of four DMRS symbols when the PSSCH has 14 symbols.

[0066] Table 1

[0067] If multiple time-domain DMRS patterns are configured in the resource pool, the specific time-domain DMRS pattern to be used is selected by the transmitting terminal device and indicated in the first-order sidelink control information (SCI). This design allows high-speed terminal devices to select a high-density DMRS pattern to ensure channel estimation accuracy, while low-speed terminal devices can use a low-density DMRS pattern to improve spectrum efficiency.

[0068] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, Among them, p i The ith CRC bit of the PSCCH that schedules the PSSCH. L may be the number of bits of the PSCCH CRC, for example, L=24.

[0069] In the NR communication system, two frequency domain DMRS patterns are supported in PDSCH and PUSCH, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, 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 sideline communication systems (such as NR-V2X), since PSSCH only needs to support two DMRS ports at most, only single-symbol DMRS frequency domain type 1 can be supported. Figure 5 is an example diagram of a single-symbol DMRS frequency domain type 1.

[0070] Determination of frequency domain resources for sideline communication

[0071] The frequency domain resources of the resource pool of some sideline communication systems (such as NR-V2X) are continuous, and the allocation granularity of the frequency domain resources is sub-channel. The number of physical resource blocks (PRBs) included in a sub-channel is {10, 12, 15, 20, 50, 75, 100}. Among them, the minimum sub-channel size can be 10PRB, which is much larger than the minimum sub-channel size of 4PRB in LTE-V2X. This is mainly because the frequency domain resources of the PSCCH in these sideline communication systems are located in the first sub-channel of the PSSCH associated with it. The frequency domain resources of the PSCCH are less than or equal to the size of a sub-channel of the PSSCH, and the time domain resources of the PSCCH occupy 2 or 3 OFDM symbols. If the sub-channel size is configured to be relatively small, the available resources of the PSCCH will be very small, the code rate will increase, and the detection performance of the PSCCH will be reduced. In these sideline communication systems, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resource must be less than or equal to the PSSCH subchannel size. The following configuration parameters in the resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools: subchannel size (sl-SubchannelSize), number of subchannels (sl-NumSubchannel), subchannel starting RB index (sl-StartRB-Subchannel), number of PRBs (sl-RB-Number), and PSCCH frequency domain resource indicator (sl-FreqResourcePSCCH).

[0072] The parameter sl-SubchannelSize is used to indicate the number of consecutive PRBs included in a subchannel in the resource pool, and its value range is {10, 12, 15, 20, 50, 75, 100} PRBs.

[0073] The parameter sl-NumSubchannel may be used to indicate the number of subchannels included in the resource pool.

[0074] The parameter sl-StartRB-Subchannel can be used to indicate the starting PRB index of the first subchannel in the resource pool.

[0075] The parameter sl-RB-Number may be used to indicate the number of consecutive PRBs included in the resource pool.

[0076] The parameter sl-FreqResourcePSCCH can be used to indicate the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0077] When the terminal device 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 with the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs included in the final sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0078] In some sideline communication systems (such as NR-V2X), the frequency domain starting position of the PSCCH and the first subchannel of its associated PSSCH are aligned. Therefore, the starting position of each PSSCH subchannel is the frequency domain starting position of a possible PSCCH. Based on the above parameters, the frequency domain range of the PSCCH and PSSCH resource pool can be determined, as shown in Figure 6. Figure 6 is an example diagram of the PSCCH and PSSCH resource pool in NR-V2X.

[0079] In some sideline communication systems (such as NR-V2X), PSCCH is used to carry sideline control information related to resource sensing. The sideline control information may include: priority of scheduled transmission, frequency domain resource allocation, time domain resource allocation, reference signal pattern of PSSCH, second-order SCI format, second-order SCI code rate offset, number of PSSCH DMRS ports, modulation and coding scheme (MCS), MCS table indication, number of PSFCH symbols, resource reservation period, and reserved bits. It should be noted that the frequency domain resource allocation is used to indicate the number of frequency domain resources of PSSCH in the current time slot scheduled by PSCCH, as well as the number and starting position of frequency domain resources of up to two retransmission resources reserved. The time domain resource allocation is used to indicate the time domain positions of up to two retransmission resources. The resource reservation period is used to reserve resources for transmission of another transport block (TB) in the next period. In addition, if inter-TB resource reservation is not activated in the resource pool configuration, the resource reservation period information bit field does not exist. The number of reserved bits is 2 to 4 bits, and the specific number of bits can be configured or pre-configured by the network device.

[0080] 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.

[0081] Determination of time domain resources (time slots) for sideline communication

[0082] In some sideline communication systems (such as NR-V2X), PSCCH / PSSCH transmission is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot. Transmission of multiple PSCCH / PSSCHs in one time slot through time division multiplexing (TDM) is not supported. PSCCH / PSSCHs between different users can be multiplexed in one time slot through frequency division multiplexing (FDM).

[0083] The time domain resources for the PSSCH in NR-V2X are based on time slots. However, unlike LTE-V2X, where the PSSCH occupies all time domain symbols within a subframe, the PSSCH in NR-V2X can occupy partial symbols within a time slot. This is primarily because in LTE, uplink and downlink transmissions are also based on subframe granularity, and therefore sidelink transmissions are also based on subframe granularity (special subframes in TDD systems are not used for sidelink transmissions). NR, on the other hand, uses a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols. This allows for more flexible scheduling and reduces latency. Figure 7 shows a typical NR system subframe. As 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, and uplink symbols are located at the end of the time slot. Flexible symbols are located between downlink and uplink symbols. The number of each type of symbol in each time slot is configurable.

[0084] 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 uplink and downlink data transmission in the NR system and degrade 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. Furthermore, if the number of uplink symbols available for sidelink transmission is small, removing AGC 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.

[0085] In the NR-V2X system, the time domain resources of the resource pool can be indicated by a bitmap. Taking into account the flexible time slot structure in the NR system, the NR-V2X system also extends the length of the bitmap, and the supported bitmap length range is [10:160]. The way NR-V2X uses the bitmap to determine the time slot position belonging to the resource pool within a system frame number (SFN) cycle is the same as in LTE-V2X, but there are two differences. The first difference is that the total number of time slots included in an SFN cycle is 10240×2 μ, where the parameter μ is related to the subcarrier spacing. The second difference is that 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. Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0086] The process of determining the time domain resources of the resource pool may include the following steps 1 to 5.

[0087] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0088] N S_SSB Indicates the number of synchronization time slots in an SFN cycle. The synchronization time slot is determined according to the synchronization-related configuration parameters, and is related to the SSB transmission cycle and the number of SSB transmission resources configured in the cycle. nonSL Indicates the number of timeslots within an SFN cycle that do not conform to the uplink symbol start and number configurations. If at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a timeslot is not semi-statically configured as an uplink symbol, the timeslot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0089] Step 2: Determine the number of reserved time slots and their corresponding time domain positions. If the number of time slots in the remaining time slot set cannot be divided evenly by the bitmap length, the number of reserved time slots and their corresponding time domain positions need to be determined. Specifically, if a time slot l r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot, Among them, 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.

[0090] 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 .

[0091] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0092] 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 .

[0093] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order Among them, T′ max Indicates the number of time slots included in the resource pool.

[0094] As shown in Figure 8, an SFN cycle (or direct frame number (DFN) cycle) consists of 10240 subframes. The synchronization signal period is 160ms, and a synchronization cycle includes two synchronization subframes. Therefore, there are a total of 128 synchronization subframes in an SFN cycle, and the length of the bitmap used to indicate the time domain resources in the resource pool is 10 bits. Therefore, two reserved subframes are required, and the number of remaining subframes is (10240 - 128 - 2 = 10110), which is evenly divisible by the bitmap length of 10. The remaining subframes are renumbered as 0, 1, 2, ..., 10109. The first three bits of the bitmap are 1, and the remaining seven bits are 0. That is, in the remaining subframes, the first three subframes out of every ten subframes belong to the resource pool, and the remaining subframes do not belong to the resource pool. Since the bitmap needs to be repeated 1011 times in the remaining subframes to indicate whether all subframes belong to the resource pool, and each bitmap period includes 3 subframes, a total of 3033 subframes belong to the resource pool in one SFN period.

[0095] Resource allocation method for sidelink communication

[0096] Currently, in some communication systems (e.g., NR), two sidelink resource configuration modes are defined, namely, a first mode (mode 1) and a second mode (mode 2).

[0097] In the first mode, the network device schedules sidelink resources for the terminal device.

[0098] For example, referring to FIG. 1 , terminal devices 121 - 123 are located within the coverage of network device 110 , and network device 110 may allocate sidelink resources to terminal devices 121 - 123 .

[0099] In the second mode, the terminal device autonomously selects sidelink resources from the resource pool.

[0100] In this mode, the terminal device performs processes including resource detection and / or resource selection. During the resource detection process, the terminal device can identify the occupancy of the sidelink resources by demodulating the SCI. The terminal device can also identify the occupancy of the sidelink resources by measuring the received power of the sidelink.

[0101] For example, referring to FIG1 , terminal devices 124 - 129 are located outside the coverage of network device 110 , and terminal devices 124 - 129 may autonomously select sidelink resources in the manner of the second mode described above.

[0102] Mode 1 resource selection in NR V2X

[0103] The first mode of resource allocation includes dynamic resource allocation and sideline configuration authorization.

[0104] Configuration authorization includes type 1 (type-1) sideline configuration authorization and type 2 (type-2) sideline configuration authorization. In type 1 sideline configuration authorization, the network device configures the sideline configuration authorization transmission resources and transmission parameters for the terminal device through radio resource control (RRC) signaling. In type 2 sideline configuration authorization, the network device configures some transmission parameters for the terminal device through RRC signaling and activates the sideline configuration authorization through downlink control information (DCI) signaling. The DCI can also be used to configure sideline transmission resources.

[0105] The dynamic resource allocation method is a resource allocation method in which the network device dynamically allocates sideline transmission resources to the terminal device through DCI. In the dynamic resource allocation method, a maximum of three sideline transmission resources are indicated in one DCI scheduling, and the three sideline transmission resources are used to transmit the same TB. In addition, as shown above, some communication systems (such as NR-V2X systems) introduce PSFCH to improve the reliability of sidelink transmission. In the dynamic scheduling resource allocation, the network device allocates sideline transmission resources to the transmitting terminal device, and the transmitting terminal device sends PSCCH / PSSCH to the receiving terminal device on the sideline transmission resources allocated by the network. The receiving terminal device sends PSFCH to the transmitting end based on the detection result. PSFCH is used to indicate whether the PSSCH is received correctly.

[0106] To support dynamic resource allocation, a new DCI format, DCI format 3_0, has been introduced in some communication systems (such as NR-V2X systems). When used for dynamic resource allocation, the DCI format is scrambled with the sidelink-radio network temporary identifier (SL-RNTI). In addition, the DCI format can also be used for activation or deactivation of sidelink configuration authorization, in which case the DCI is scrambled with the sidelink-configured scheduling-radio network temporary identifier (SL-CS-RNTI).

[0107] DCI format 3_0 primarily includes the following information: resource pool index, sidelink transmission resource indication information, PUCCH transmission resource indication information, HARQ process number (HARQ process number), new data indicator (NDI), configuration index (configuration index), and counter sidelink assignment index. Each of these information items is described below.

[0108] 1. Resource pool index

[0109] In some communication systems (e.g., NR-V2X systems), network devices are supported to configure multiple first-mode resource pools. When scheduling sideline transmission resources via DCI, resource pool index information needs to be indicated in the DCI. The terminal device can determine which resource pool the sideline transmission resources scheduled by the DCI belong to based on the resource pool index information.

[0110] 2. Side transmission resource indication information

[0111] The network device can allocate N sideline transmission resources to the terminal device for transmitting PSCCH and PSSCH. max . N max Can be 2 or 3. N max It can be a pre-configured or network-configured parameter. The network device indicates the time domain and frequency domain information of the N sideline transmission resources in the DCI. Specifically, the time and frequency resource information of the N sideline transmission resources is indicated in the DCI through the following information fields: time gap, time resource assignment, lowest index of the subchannel allocation to the initial transmission, and frequency resource assignment. The above information fields are introduced below.

[0112] The time interval is used to indicate the time slot interval between the first side transmission resource and the time slot where the DCI is located. The time domain position of the first side transmission resource can be determined based on this information and the time domain position where the terminal device receives the DCI. The network configures a table of time intervals through high-level signaling sl-DCI-ToSL-Trans. The elements in the table represent the number of side time slots. The parameter carried in the DCI is an index value. According to the index value and the time interval table, the specific time interval size can be determined. The time slot where the first side transmission resource is located is located in the resource pool and is no earlier than The first time slot at time T DL It is the time corresponding to the starting position of the downlink time slot where the DCI is located, T TA is the current timing advance of the scheduled UE, K SL It is the number of time slots corresponding to the time interval determined by the Time gap information field in the DCI. slot Indicates the duration of the time slot.

[0113] The time resource allocation information field indicates time resources in the same manner as SCI format 1-A. This parameter is represented by a time resource indication value (TRIV). This parameter is used to determine the time slot intervals of the remaining N-1 sideline transmission resources, excluding the first sideline transmission resource, relative to the first sideline transmission resource. Based on the time domain position of the first transmission resource determined above, this information is combined to determine the time domain positions of the remaining N-1 transmission resources.

[0114] The frequency domain starting subchannel indicator information field of the initial transmission is used to indicate the lowest index of the subchannel occupied by the first sidelink transmission resource. Since the frequency domain starting positions of the PSCCH and PSSCH are aligned, the frequency domain starting positions of the PSCCH and PSSCH can be determined based on this information.

[0115] The frequency domain resource allocation information field indicates frequency domain resources in the same way as SCI format 1-A. This parameter is represented by the frequency resource indication value (FRIV), which is used to determine the frequency domain resource size (i.e., the number of subchannels) of the sideline transmission resource, as well as the frequency domain starting position of the other N-1 sideline transmission resources except the first sideline transmission resource.

[0116] 3. PUCCH transmission resource indication information

[0117] The PUCCH transmission resource indication information is used to indicate the PUCCH transmission resource for the terminal to report sidelink HARQ feedback information to the network. In DCI format 3-0, the PUCCH transmission resource is indicated through two information fields.

[0118] 4. HARQ process number information

[0119] The HARQ process number information is used to indicate the HARQ process number corresponding to the sidelink transmission resource allocated by the network to the terminal.

[0120] 5. New data indication

[0121] When the sidelink transmission resources scheduled by DCI format 3-0 are used for new data transmission, the NDI is flipped, otherwise it is not flipped.

[0122] 6. Configure index

[0123] When the terminal device is configured with SL-CS-RNTI, DCI format 3_0 can be used to activate or deactivate Type-2 sideline configuration grant. The network device can configure multiple parallel Type-2 sideline configuration grants, and the configuration index is used to indicate the sideline configuration grant activated or deactivated by the DCI. When the terminal device is not configured with SL-CS-RNTI, this information field is 0 bits.

[0124] 7. Cumulative side-trip authorization index

[0125] The cumulative sidelink grant index is used to indicate the cumulative number of DCIs sent by the network device for scheduling sidelink transmission resources. When the terminal device reports sidelink HARQ feedback information to the network device, the terminal device can determine the number of information bits contained in the generated HARQ-ACK codebook based on the information.

[0126] Sidelink-based positioning

[0127] In the 3rd Generation Partnership Project (3GPP) R-17, 3GPP RAN conducted research on "NR positioning enhancements" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage." The "scenarios and requirements for NR positioning use cases in coverage, partial coverage, and out of coverage" study focused on V2X and public safety use cases. In addition, the 3GPP SA1 working group also developed requirements for "ranging-based services" and positioning accuracy requirements for industrial Internet of Things (IIoT) use cases in out-of-coverage scenarios. 3GPP needs to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0128] To improve positioning accuracy, especially for devices 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. The next step is to standardize solutions for sidetrack positioning (including ranging and direction finding) in NR systems.

[0129] The following is an introduction to the content of standardization. On the one hand, the sidelink positioning reference signal (SL PRS) is standardized. SL PRS uses a frequency domain structure based on a comb (not excluding the full resource element (RE) mapping mode), adopts a sequence format based on a pseudo-random sequence, takes the existing DL-PRS sequence as the design starting point, and supports a SL PRS bandwidth of up to 100MHz in frequency range 1 (frequency range, FR1). On the other hand, standardization is used to support the measurement quantities of the sidelink round trip time (SL RTT), sidelink signal arrival angle (SL-AOA) and sidelink arrival time difference (SL-TDOA) positioning methods. On the other hand, the resource allocation scheme of SL PRS is standardized, including resource allocation scheme 1 and scheme 2. Scheme 1 corresponds to the resources allocated by the network device for SL PRS transmission. That is, scheme 1 corresponds to the first mode of resource allocation described above. Scheme 2 corresponds to the terminal device autonomously selecting resources for SL PRS transmission. That is, the scheme corresponds to the second mode of resource allocation described above. Support for shared resource pools for SL PRS and Rel-16 / 17 / 18 sidelink communications, as well as dedicated resource pools for SL PRS. For Option 2, research and standardization are needed for resource selection based on channel sensing and / or random resource selection, congestion control, and / or resource selection based on terminal coordination. Additionally, standardization of open-loop power control mechanisms for SL PRS transmissions is required.

[0130] In the case where the network device allocates resources for sending SL PRS, the sending terminal device cannot determine the resources allocated by the network device, resulting in the sending terminal device being unable to send SL PRS. In addition, if the receiving terminal device cannot determine the resources used for sending SL PRS, it cannot accurately receive SL PRS. In other words, the terminal devices in the side communication (including the sending terminal device and / or the receiving terminal device) cannot obtain the resources for sending SL PRS, making it difficult to achieve accurate transmission of SL PRS.

[0131] In response to the above problems, the present application proposes to indicate the resources used for SL PRS transmission through the first information or the second information. The resources used for SL PRS transmission may refer to the time slot and OFDM symbol occupied by an SL PRS in the time domain. In addition, the resources used for SL PRS transmission indicated by the first information or the second information may be the resources currently used for SL PRS transmission, or may be the resources used for SL PRS transmission in the future. In some embodiments, the resources used for SL PRS transmission may also be referred to as SL PRS transmission resources.

[0132] FIG9 is a schematic flowchart of a communication method provided in an embodiment of the present application. The method shown in FIG9 can be performed by a network device and a first terminal device. The method shown in FIG9 may include step S910. In step S910, the network device sends first information. Correspondingly, the first terminal device receives the first information.

[0133] The resources for SL PRS transmission indicated by the first information may be resources allocated or determined by the network device. In other words, the resources for SL PRS transmission may be determined by the first mode or scheme 1. For example, the network device may allocate resources for SL PRS transmission to the first terminal device by dynamic resource allocation or by providing configuration authorization to the first terminal device.

[0134] As an implementation method, the network device can transmit the first information through DCI and / or RRC layer signaling, that is, the first information can be included in the DCI and / or RRC layer signaling. For example, the first information can be transmitted through DCI, that is, the network device can dynamically allocate resources for SL PRS transmission to the first terminal device through DCI. Alternatively, the first information can be transmitted through DCI and RRC layer signaling, that is, the network device can provide configuration authorization to the first terminal device through RRC layer signaling, and when the network device allocates resources to the first terminal device, it can indicate the specific resources for SL PRS transmission through DCI.

[0135] The first terminal device may be a sending terminal device of the SL PRS. Based on the first information, the first terminal device may obtain resource scheduling information of the network device for the SL PRS, and thus may accurately send the SL PRS based on the resource scheduling information.

[0136] FIG10 is a schematic flow chart of another communication method provided by an embodiment of the present application. FIG10 can be performed by a first terminal device and a second terminal device. The method shown in FIG10 may include step S1010. In step S1010, the first terminal device sends second information. Correspondingly, the second terminal device receives the second information.

[0137] The resources used for SL PRS transmission in the second information may be resources allocated or determined by the network device, or the resources used for SL PRS transmission may be determined by the first terminal device. In other words, the resources used for SL PRS transmission may be determined by the first mode or scheme 1, or may be determined by the second mode or scheme 2. In the case where the resources used for SL PRS transmission are determined by the first mode, the first terminal device may receive the first information used by the network device to indicate the resources used for SL PRS transmission, and indicate the resources used for SL PRS transmission to the second terminal device through the second information. In the case where the resources used for SL PRS transmission are determined by the second mode, the first terminal device may determine the resources used for SL PRS transmission by itself, and indicate the resources used for SL PRS transmission to the second terminal device through the second information.

[0138] As an implementation manner, the first terminal device may send the second information via high-layer signaling or SCI, that is, the second information may be included in the high-layer signaling and / or SCI. The high-layer signaling may be PC5 high-layer signaling. The high-layer signaling may be medium access control (MAC) layer signaling and / or RRC layer signaling.

[0139] In some embodiments, the first terminal device may be a transmitting terminal device of the SL PRS, and the second terminal device may be a receiving terminal device of the SL PRS. The first terminal device may inform the second terminal device at the receiving end of the resources used for transmitting the SL PRS through the second information, so that the second terminal device can receive the SL PRS on the corresponding resources, thereby accurately receiving the SL PRS.

[0140] In some embodiments, the first terminal device may be a transmitting terminal device of an SL PRS, and the second terminal device may be any terminal device in the sideline communication system. The second terminal device may parse the first information to determine the resources that the first terminal device has selected for transmitting the SL PRS of the first terminal device, thereby selecting other resources for transmitting the SL PRS of the second terminal device. This can reduce interference between terminal devices caused by resource overlap.

[0141] In some embodiments, the first information may include the interval indication field and / or the time domain resource allocation indication field described above. The second information may include the interval indication field and / or the time domain resource allocation indication field described above. The time interval indication field and / or the time domain resource allocation indication field are used to indicate one or more time slots used for SL PRS transmission. For example, in the case where the resources used for SL PRS transmission are determined by the first mode, the first information may include the interval indication field and the time domain resource allocation indication field described above. Alternatively, in the case where the resources used for SL PRS transmission are determined by the second mode, the second information may include the time domain resource allocation indication field described above.

[0142] The one or more time slots used for SL PRS transmission may include a first time slot. The first information may be used to indicate resources used for SL PRS transmission in the first time slot. The second information may be used to indicate resources used for SL PRS transmission in the first time slot.

[0143] The resources used for SL PRS transmission in the first time slot can be indicated by SL PRS resources or OFDM symbols. That is, the resources used for SL PRS transmission can be indicated based on the granularity of SL PRS resources and / or the granularity of OFDM symbols. In some embodiments, the first information can be used to indicate the SL PRS resources used for SL PRS transmission in the first time slot. In some embodiments, the first information can be used to indicate the OFDM symbols used for SL PRS transmission in the first time slot. In some embodiments, the second information can be used to indicate the SL PRS resources used for SL PRS transmission in the first time slot. In some embodiments, the second information can be used to indicate the OFDM symbols used for SL PRS transmission in the first time slot. These two methods are explained below respectively.

[0144] The first time slot may include one or more SL PRS resources (or simply referred to as PRS resources). For example, the OFDM symbols in the first time slot may be configured or preconfigured as one or more SL PRS resources by the network device. The one or more SL PRS resources may include a first SL PRS resource. The first SL PRS resource may uniquely correspond to one or more specific OFDM symbols in the first time slot. The first SL PRS resource may uniquely correspond to an index.

[0145] The following uses FIG11 and FIG12 as examples to illustrate the method for dividing SL PRS resources in the first time slot.

[0146] In some embodiments, multiple SL PRS resources in the first time slot may not overlap. In other words, each symbol in the first time slot may uniquely correspond to one SL PRS resource, or each SL PRS resource may occupy a different OFDM symbol. As shown in FIG11 , the first time slot is configured or preconfigured by the network as four SL PRS resources, each of which occupies a different OFDM symbol. The four SL PRS resources may correspond to indexes 0, 1, 2, and 3, respectively.

[0147] In some embodiments, multiple SL PRS resources in the first time slot may overlap. In other words, one or some symbols in the first time slot may correspond to one SL PRS resource, or may correspond to multiple SL PRS resources. Alternatively, at least two SL PRS resources may occupy the same symbol. As shown in Figure 12, the first time slot is configured or preconfigured as 5 SL PRS resources by the network device. The 5 SL PRSs may correspond to indexes 0, 1, 2, 3 and 4, respectively. Among them, OFDM symbol #4 to OFDM symbol #6 can be configured as SL PRS resource #1, OFDM symbol #7 to OFDM symbol #9 can be configured as SL PRS resource #2, and OFDM symbol #4 to OFDM symbol #7 can also be configured as SL PRS resource #4. It can be seen that SL PRS resource #4 overlaps with other SL PRS resources.

[0148] The first information may be used to indicate M SL PRS resources used for SL PRS transmission in the first time slot. The second information may be used to indicate M SL PRS resources used for SL PRS transmission in the first time slot, where M is an integer greater than or equal to 1.

[0149] As an implementation method, when multiple SL PRS resources in the first time slot do not overlap, the first information can indicate one SL PRS resource. Similarly, when multiple SL PRS resources in the first time slot do not overlap, the second information can indicate one SL PRS resource. For example, when a network device allocates SL PRS resources, the network device can only allocate one of them to one terminal device, and indicate the SL PRS resource through the first information. Alternatively, when the terminal device autonomously selects the SL PRS sending resource, the terminal device can only select one SL PRS resource in the first time slot, and indicate the SL PRS resource through the second information.

[0150] It is understandable that the first information indicating only one SL PRS resource is conducive to simplifying the design of the resource indication signaling including the first information. Similarly, the second information indicating only one SL PRS resource is conducive to simplifying the design of the resource indication signaling including the first information. For example, the bit length occupied by the first information can be fixed to indicate one SL PRS resource, thereby avoiding complex signaling design caused by changes in bit length. Moreover, in the case of indicating only one SL PRS resource, the bit length occupied by the first information or the second information can be shorter.

[0151] As an implementation method, when multiple SL PRS resources in the first time slot do not overlap, the first information may indicate one or more SL PRS resources. Similarly, when multiple SL PRS resources in the first time slot do not overlap, the second information may indicate one or more SL PRS resources. For example, when a network device allocates SL PRS resources, the network device may allocate one or more SL PRS resources to a terminal device, and indicate the allocated SL PRS resources through the first information. Alternatively, when the terminal device autonomously selects SL PRS sending resources, the terminal device may select one or more SL PRS resources within the first time slot, and indicate the selected SL PRS resources through the second information.

[0152] It should be noted that, when the first information or the second information indicates multiple SL PRS resources, the multiple SL PRS resources may be continuous or discontinuous.

[0153] It is understandable that, when multiple SL PRS resources in the first time slot do not overlap, the first information or the second information can indicate not only one SL PRS resource but also multiple SL PRS resources, which can make the indication of SL PRS resources more flexible.

[0154] As an implementation method, when multiple SL PRS resources overlap in the first time slot, the first information may indicate only one SL PRS resource. Similarly, when multiple SL PRS resources overlap in the first time slot, the second information may indicate only one SL PRS resource. For example, when a network device allocates SL PRS resources, the network device can only allocate one of them to one terminal device, and indicate the SL PRS resource through the first information. Alternatively, when the terminal device autonomously selects the SL PRS sending resource, the terminal device can only select one SL PRS resource in the first time slot, and indicate the SL PRS resource through the second information.

[0155] When multiple SL PRS resources in the first time slot overlap, the first information or the second information may indicate only one SL PRS resource. This not only allows for flexible indication of SL PRS resources, but also simplifies the design of resource indication signaling including the first information or the second information. For example, for the SL PRS resource partitioning method shown in FIG12 , if there are only SL PRS resources #1 and SL PRS resources #2, this can be achieved by indicating only one SL PRS resource #4, thereby achieving both flexibility and simplicity.

[0156] In some embodiments, the first information may indicate the M SL PRS resources by indicating the index of the SL PRS resource. Similarly, the second information may indicate the M SL PRS resources by indicating the index of the SL PRS resource. For example, the first information may include the index of the first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for SL PRS transmission. Alternatively, the second information may include the index of the first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for SL PRS transmission.

[0157] As an implementation method, if the first information can indicate to the first terminal device at most S time slots of resources for SL PRS transmission at one time, then there may be R×S bits in the first information for indicating the SL PRS resource index allocated to the first terminal device in the S time slots. N is the maximum number of SL PRS resources configured in a time slot. The R×S bits may correspond to S time slots in sequence, i.e., the 0th to the The bit can correspond to the first time slot, the No. The bit corresponds to the second time slot, etc. If the number of time slots actually indicated by the first information is less than S, the first terminal device may not interpret the corresponding bit.

[0158] As an implementation method, if the second information can indicate to the second terminal device at most S time slots of resources for SL PRS transmission, then there may be R×S bits in the second information for indicating the SL PRS resource index used by the first terminal device in the S time slots. N is the maximum number of SL PRS resources configured in a time slot. The R×S bits correspond to S time slots in sequence, i.e., the 0th to the The bit corresponds to the first time slot, the No. The bit corresponds to the second time slot, and so on. If the time slot number actually indicated by the second information is less than S, the second terminal device may not interpret the corresponding bit.

[0159] It is understandable that based on the above technical solution, the first time slot is divided into one or more time domain SL PRS resources. When allocating resources, resources can be allocated to the terminal device by indicating the time domain SL PRS resource index, which is conducive to reducing the number of bits of indication signaling.

[0160] In some embodiments, the first information may be used to indicate one or more OFDM symbols used for SL PRS transmission in the first time slot. Similarly, the second information may be used to indicate one or more OFDM symbols used for SL PRS transmission in the first time slot. For example, when the network device allocates resources for SL PRS transmission, the one or more OFDM symbols in the first time slot may be directly allocated to the first terminal device through the first information.

[0161] The present application does not limit the method of indicating one or more OFDM symbols for SL PRS transmission in the first time slot. For example, the first information can be used to indicate the starting symbol (i.e., starting point) of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols. Alternatively, the second information can be used to indicate the starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

[0162] It should be noted that the symbol number can be used to indicate the number of consecutive OFDM symbols used for SL PRS transmission in the first time slot. In some embodiments, the symbol number can be less than or equal to the maximum symbol number. The maximum symbol number can be a positive integer. The maximum symbol number can be, for example, 14, that is, the symbol number can be an integer less than or equal to 14. In some embodiments, the symbol number can be greater than or equal to the minimum symbol number. The minimum symbol number can be a positive integer. The minimum symbol number can be, for example, 3. The maximum symbol number or the minimum symbol number can be defined by network device configuration, pre-configuration, or a standard.

[0163] In some implementations, if the first information can indicate a maximum of S time slots of resources for SL PRS transmission for the first terminal device, the first information may include R×S bits. The R×S bits can be used to indicate the OFDM symbols allocated to the first terminal device in the S time slots. Bits 0 to R-1 of the R×S bits can be used to indicate the starting symbol and / or the number of symbols of the OFDM symbol allocated to the first terminal device in the first time slot. Bits R to 2R-1 can be used to indicate the starting symbol and / or the number of symbols of the OFDM symbol allocated to the first terminal device in the second time slot, and so on.

[0164] As an implementation, the first information may directly indicate the specific numerical value of the starting symbol and / or the number of symbols. Similarly, the second information may directly indicate the specific numerical value of the starting symbol and / or the number of symbols. Taking the first time slot as the first time slot of S time slots as an example, the numerical value of bits 0 to R-1 in the first information may be equal to the starting symbol and / or the number of symbols used for SL PRS transmission in the first time slot.

[0165] It can be understood that the first information directly indicates the starting symbol and / or the number of symbols, which can make the indication of the first information more flexible.

[0166] It should be noted that, in some embodiments, the first information or the second information may include a first indication, which may be used to indicate that one of the multiple candidate symbol numbers is the symbol number. The multiple candidate symbol numbers may be configured, pre-configured, or defined by a standard on the network device. Furthermore, the multiple candidate symbol numbers may be discontinuous. For example, the network device may be configured or pre-configured with four candidate symbol numbers. The four candidate symbol numbers may, for example, be {3, 5, 8, 10}. The first indication may indicate that the symbol number is the second candidate symbol number among the four candidate symbol numbers, i.e., 5.

[0167] As an implementation method, the first information may include one or more resource indexes. Similarly, the second information may include one or more resource indexes. The resource index may uniquely correspond to the starting symbol and / or the number of symbols. For example, in the first time slot, the network device may configure or pre-configure N groups of optional {OFDM symbol starting point (i.e., starting symbol), number of consecutive OFDM symbols (i.e., number of symbols)} resource combinations. Each resource combination in the N groups of resource combinations may correspond to a unique resource index. The OFDM symbol starting point and the number of occupied OFDM symbols of the resources used for SL PRS transmission in the first time slot may only be one of the above combinations. Wherein, N may be a positive integer.

[0168] It can be understood that by indicating the symbol used for SL PRS transmission through the resource index, the number of bits of the first information or the second information can be reduced, and the indication signaling of the resources used for SL PRS transmission can be simplified.

[0169] The first information or the second information can also be used to indicate the time slot interval of the resource for SL PRS transmission. The time slot interval can be used to indicate the time interval between the time slots used for SL PRS transmission. The time slot interval can also be used to indicate the time interval between the time slot where the first information or the second information is located and the time slot used for SL PRS transmission. For example, the first information can indicate multiple time slot intervals. The first time slot interval can be based on the time slot where the first information is located (for example, the time slot of the DCI containing the first information), that is, the time interval between the first time slot for SL PRS transmission indicated by the first information and the time slot where the first information is located can be the first time slot interval. Time slot intervals other than the first time slot interval can be based on the previous time slot used for SL PRS transmission. Taking the second time slot interval as an example, the time interval between the second time slot for SL PRS transmission indicated by the first information and the first time slot can be the second time slot interval.

[0170] The resource index can uniquely correspond to the time slot interval. The following is an example of the unique correspondence between the resource index and the time slot interval, the starting symbol and the number of symbols. In the first time slot, the network device can configure or pre-configure L groups of optional {time slot interval, OFDM symbol starting point (ie starting symbol), number of consecutive OFDM symbols (ie number of symbols)} resource combinations. Each resource combination in the L groups of resource combinations can correspond to a unique resource index. The time slot interval of the resource used for SL PRS transmission, the starting point of the OFDM symbol in the first time slot and the number of OFDM symbols occupied in the first time slot can only be one of the above combinations. Among them, L can be a positive integer.

[0171] It should be noted that the first information may include one or more resource indexes to indicate the transmission resources of one or more SL PRSs. Similarly, the second information may include one or more resource indexes to indicate the transmission resources of one or more SL PRSs. For example, multiple resource indexes may correspond one-to-one to the transmission resources of multiple SL PRSs.

[0172] By indicating the time slot interval, the starting symbol and the number of symbols through the resource index, the information fields indicating the time slot interval, the starting symbol and the number of symbols can be reduced, thereby simplifying the indication signaling.

[0173] It should be noted that indicating the resources used for SL PRS transmission based on the granularity of SL PRS resources may be applicable to the first mode of resource allocation or the second mode of resource allocation. Indicating the resources used for SL PRS transmission based on the granularity of symbols may only be applicable to the first mode of resource allocation.

[0174] It can be understood that whether the resources used for SL PRS transmission are indicated based on the granularity of SL PRS resources or the granularity of OFDM symbols, a smaller resource allocation granularity can be achieved relative to the time slot granularity, thereby increasing the capacity of the side-track positioning system, reducing interference between users in the system, and thereby improving positioning accuracy.

[0175] It should be noted that the first terminal device can transmit the second information through PC5 high-layer signaling and / or SCI. For example, the first terminal device can send the SL PRS and / or the second information through the following two methods. Method 1: The first terminal device can indicate the sending of the SL PRS through SCI. Method 2: The first terminal device can indicate the sending of the SL PRS through PC5 high-layer signaling.

[0176] The method adopted by the first terminal device to indicate the sending of the SL PRS may be defined by a standard, configured by a network device, or pre-configured. For example, the first terminal device may only adopt method 1 to indicate the sending of the SL PRS. Alternatively, the first terminal device may adopt method 1 to indicate the sending of the SL PRS in the following cases: the network device dynamically allocates resources, the terminal device autonomously selects resources; and adopt method 2 to indicate the sending of the SL PRS in the following cases: the network device allocates resources through configuration authorization.

[0177] The following is a detailed description of the first and second methods proposed in this application.

[0178] Method 1

[0179] In mode 1, the SCI used to indicate the transmission of SL PRS may be a first-order SCI and / or a second-order SCI. The SCI and the indicated SL PRS may be transmitted in the same time slot or in different time slots. When the SCI and SL PRS are transmitted in the same time slot, the physical channel used to carry the SCI and the SL PRS indicated by the SCI may be transmitted in the same OFDM symbol and / or different OFDM symbols. The physical channel used to carry the SCI may include PSCCH and / or PSSCH.

[0180] In some embodiments, there may be a unique correspondence between the resources of the physical channel used to carry the SCI and the resources indicated by the SCI for sending the SL PRS, and this correspondence may be referred to as a first relationship. In other words, the first terminal device may uniquely determine the resources of the physical channel where the SCI indicating the SL PRS is located based on the resources used for sending the SL PRS. The first relationship may be defined by network configuration, pre-configuration, or standard.

[0181] As an implementation method, the PSCCH and SL PRS used to carry the SCI can occupy adjacent OFDM symbols in the first time slot. As shown in Figure 13, the PSCCH occupies one OFDM symbol and the SL PRS occupies .

[0182] As an implementation method, the PSCCH and SL PRS used to carry the SCI can be frequency-division or time-division multiplexed within the first time slot. The PSCCH can occupy only one or more OFDM symbols. The number of OFDM symbols and the bandwidth occupied by the PSCCH can be configured, pre-configured or defined by the standard by the network equipment. As shown in Figure 14, the bandwidth of the SL PRS indicated by the PSCCH may not be less than the bandwidth of the PSCCH. If the SL PRS bandwidth is greater than the PSCCH bandwidth, the SL PRS can be sent on the OFDM symbol where the PSCCH is located.

[0183] It should be noted that the correspondence between the above two types of PSCCH and the indicated SL PRS is independent of the resource allocation method adopted by the first terminal device, that is, it is applicable in both resource allocation mode 1 and resource allocation mode 2.

[0184] Taking into account the first relationship described above, based on the resources indicated by the second information for SL PRS transmission, the resources of the physical channel where the corresponding SCI is located can be determined. As an implementation method, the resources indicated by the second information for SL PRS transmission can also be used to send the resources of the physical channel where the SCI is located. For example, when the second information is included in the SCI, the SCI is carried on the PSCCH, and the resources used for SL PRS transmission can also be used to send the PSCCH. It can be seen that in some embodiments, there is no need to additionally indicate the resources of the physical channel where the SCI for indicating the SL PRS is located.

[0185] Method 2

[0186] In the second method, the first terminal device can indicate the second information through high-layer signaling. In other words, the second terminal device (SL PRS receiving terminal device) can receive the SL PRS by receiving the above-mentioned high-layer signaling. The second information can be included in the SL PRS sending information. In other words, the SL PRS sending information is used to indicate the resources used for SL PRS sending and the SL PRS sending method. The SL PRS sending method may include the sequence ID of the SL PRS, the RE occupied by the SL PRS, and other information necessary for the second terminal device to receive the SL PRS. The high-layer signaling can be PC5 high-layer signaling. PC5 high-layer signaling may include, for example, MAC layer or RRC layer signaling. For example, if the first terminal device (SL PRS sending terminal device) has a configuration authorization provided by the network, the first terminal device can send the configuration authorization and the SL PRS sending method to the SL PRS receiving terminal through high-layer signaling. The second terminal device can receive the SL PRS based on the above information.

[0187] In mode 2, the second information may only indicate resources for sending SL PRS. For example, when the network device allocates resources to the first terminal device, it may only allocate resources for sending SL PRS to the first terminal device without allocating resources for indicating the physical channel for sending SL PRS.

[0188] In some embodiments, when the SL PRS is periodically transmitted, the second information may be included in the PC5 high-layer signaling. In other words, when the SL PRS is periodically transmitted, the second information may be transmitted via mode 2. Alternatively, for periodic SL PRS, the first terminal device may not transmit an SCI to indicate SL PRS transmission, but may instead instruct SL PRS transmission via PC5 high-layer signaling.

[0189] It should be noted that, if the resources used for SL PRS transmission are allocated by the network device, the transmission bandwidth of the SL PRS may be indicated by the DCI, or the transmission bandwidth of the SL PRS may be configured or pre-configured by the network device.

[0190] It should be noted that when the network device allocates resources for SL PRS transmission to the first terminal device through DCI, the CRC carrying the DCI can be scrambled by the RNTI configured separately by the network device. The first terminal device can use the RNTI to descramble the received PDCCH to obtain the DCI.

[0191] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 14 . The device embodiment of the present application is described in detail below in conjunction with Figures 15 to 19 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0192] FIG15 is a schematic structural diagram of a terminal device 1500 provided in an embodiment of the present application. The terminal device 1500 is a first terminal device and may include a first receiving unit 1510 .

[0193] The first receiving unit 1510 is used to receive first information sent by a network device; wherein the first information is used to indicate resources used for SL PRS sending.

[0194] In some embodiments, the first information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, where M is an integer greater than or equal to 1.

[0195] In some embodiments, the first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

[0196] In some embodiments, when a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate one SL PRS resource used for the SL PRS transmission in the first time slot.

[0197] In some embodiments, the first information is used to indicate one or more OFDM symbols used for the SL PRS transmission in a first time slot.

[0198] In some embodiments, the first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

[0199] In some embodiments, the first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

[0200] In some embodiments, the first information includes a first indication, and the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

[0201] In some embodiments, the first information is further used to indicate a time slot interval of resources used for sending the SL PRS.

[0202] In some embodiments, the first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

[0203] In some embodiments, the first information is included in one or more of the following: DCI, RRC layer signaling.

[0204] In some embodiments, the first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for SL PRS transmission.

[0205] FIG16 is a schematic structural diagram of a terminal device 1600 provided in an embodiment of the present application. The terminal device 1600 is a first terminal device and may include a first sending unit 1610 .

[0206] The first sending unit 1610 is used to send second information to the second terminal device; wherein the second information is used to indicate resources used for SL PRS sending.

[0207] In some embodiments, the second information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more OFDM symbols, where M is an integer greater than or equal to 1.

[0208] In some embodiments, the second information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

[0209] In some embodiments, when a plurality of SL PRS resources included in the first time slot overlap, the second information is used to indicate one SL PRS resource used for the SL PRS transmission in the first time slot.

[0210] In some embodiments, the second information is used to indicate one or more OFDM symbols used for the SL PRS transmission in the first time slot.

[0211] In some embodiments, the second information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

[0212] In some embodiments, the second information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

[0213] In some embodiments, the second information includes a first indication, and the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

[0214] In some embodiments, the second information is further used to indicate a time slot interval of resources used for sending the SL PRS.

[0215] In some embodiments, the second information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

[0216] In some embodiments, the second information includes one or more of the following: PC5 high layer signaling, side control information SCI.

[0217] In some embodiments, when the SL PRS is sent periodically, the second information is included in the PC5 high layer signaling.

[0218] In some embodiments, when the second information is included in the SCI, the SCI is carried on the PSCCH, and the resources used for sending the SL PRS are also used to send the PSCCH.

[0219] In some embodiments, the second information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for SL PRS transmission.

[0220] In some embodiments, the resources used for SL PRS transmission are selected by the first terminal device through autonomous resource selection, or are obtained by receiving DCI and / or RRC layer signaling sent by a network device.

[0221] FIG17 is a schematic structural diagram of a network device 1700 provided in an embodiment of the present application. The network device 1700 includes a second sending unit 1710 .

[0222] The second sending unit 1710 is used to send first information to the first terminal device; wherein the first information is used to indicate resources used for sending the sideline positioning reference signal SL PRS.

[0223] In some embodiments, the first information is used to indicate the sending of M SL PRS resources for the SL PRS in a first time slot, the first time slot including one or more SL PRS resources, the SL PRS resources including one or more orthogonal frequency division multiplexing OFDM symbols, where M is an integer greater than or equal to 1.

[0224] In some embodiments, the first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

[0225] In some embodiments, when a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate one SL PRS resource used for the SL PRS transmission in the first time slot.

[0226] In some embodiments, the first information is used to indicate one or more OFDM symbols used for the SL PRS transmission in a first time slot.

[0227] In some embodiments, the first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

[0228] In some embodiments, the first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

[0229] In some embodiments, the first information includes a first indication, and the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

[0230] In some embodiments, the first information is further used to indicate a time slot interval of resources used for sending the SL PRS.

[0231] In some embodiments, the first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

[0232] In some embodiments, the first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for SL PRS transmission.

[0233] In some embodiments, the first information includes one or more of the following: downlink control information DCI, and radio resource control RRC layer signaling.

[0234] FIG18 is a schematic structural diagram of a terminal device 1800 provided in an embodiment of the present application. The terminal device 1800 may be a second terminal device and includes a second receiving unit 1810 .

[0235] The second receiving unit 1810 is configured to receive second information sent by the first terminal device, wherein the second information is used to indicate resources used for sending the SL PRS.

[0236] In some embodiments, the second information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more OFDM symbols, where M is an integer greater than or equal to 1.

[0237] In some embodiments, the second information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

[0238] In some embodiments, when a plurality of SL PRS resources included in the first time slot overlap, the second information is used to indicate one SL PRS resource used for the SL PRS transmission in the first time slot.

[0239] In some embodiments, the second information is used to indicate one or more OFDM symbols used for the SL PRS transmission in the first time slot.

[0240] In some embodiments, the second information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

[0241] In some embodiments, the second information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

[0242] In some embodiments, the second information includes a first indication, and the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

[0243] In some embodiments, the second information is further used to indicate a time slot interval of resources used for sending the SL PRS.

[0244] In some embodiments, the second information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

[0245] In some embodiments, the second information includes one or more of the following: PC5 high layer signaling, side control information SCI.

[0246] In some embodiments, when the SL PRS is sent periodically, the second information is included in the PC5 high layer signaling.

[0247] In some embodiments, when the second information is included in the SCI, the SCI is carried on the PSCCH, and the resources used for sending the SL PRS are also used to send the PSCCH.

[0248] In some embodiments, the second information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for SL PRS transmission.

[0249] In some embodiments, the resources used for SL PRS transmission are selected by the first terminal device through autonomous resource selection, or are obtained by receiving DCI and / or RRC layer signaling sent by a network device.

[0250] In an optional embodiment, the receiving unit 1510, the first sending unit 1610, and the second sending unit 1710 may all be transceivers 1830. The terminal device 1500, the terminal device 1600, and the network device 1700 may also include a memory 1820 and / or a processor 1810, as specifically shown in FIG18 .

[0251] Figure 19 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 19 indicate that the unit or module is optional. Device 1900 may be used to implement the method described in the above method embodiment. Device 1900 may be a chip, a terminal device, or a network device.

[0252] The device 1900 may include one or more processors 1910. The processor 1910 may support the device 1900 to implement the method described in the above method embodiment. The processor 1910 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0253] The apparatus 1900 may further include one or more memories 1920. The memories 1920 store programs that can be executed by the processor 1910, causing the processor 1910 to perform the methods described in the above method embodiments. The memories 1920 may be independent of the processor 1910 or integrated into the processor 1910.

[0254] The apparatus 1900 may further include a transceiver 1930. The processor 1910 may communicate with other devices or chips via the transceiver 1930. For example, the processor 1910 may transmit and receive data with other devices or chips via the transceiver 1930.

[0255] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0256] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0257] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0258] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0259] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0260] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0261] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0262] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0263] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0264] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0265] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0266] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0267] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0268] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0269] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0270] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: The first terminal device receives the first information sent by the network device; The first information is used to indicate resources used for sending a side positioning reference signal SL PRS.

2. The method according to claim 1, characterized in that The first information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, wherein M is an integer greater than or equal to 1.

3. The method according to claim 2, characterized in that The first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS sending.

4. The method according to claim 2 or 3, characterized in that: In a case where a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

5. The method according to claim 1, characterized in that The first information is used to indicate one or more OFDM symbols used for sending the SL PRS in a first time slot.

6. The method according to claim 5, characterized in that The first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

7. The method according to claim 6, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

8. The method according to claim 6, characterized in that The first information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

9. The method according to any one of claims 6 to 8, characterized in that: The first information is also used to indicate a time slot interval of resources used for sending the SL PRS.

10. The method according to claim 9, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

11. The method according to any one of claims 1 to 10, characterized in that The first information includes one or more of the following: downlink control information DCI, and radio resource control RRC layer signaling.

12. The method according to any one of claims 1 to 11, characterized in that The first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

13. A communication method, characterized in that: include: The first terminal device sends second information to the second terminal device; The second information is used to indicate resources used for sending a sideline positioning reference signal SL PRS.

14. The method according to claim 13, characterized in that The second information is used to indicate M SL PRS resources used for the SL PRS transmission in the first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, where M is an integer greater than or equal to 1.

15. The method according to claim 14, characterized in that The second information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

16. The method according to claim 14 or 15, characterized in that In a case where a plurality of SL PRS resources included in the first time slot overlap, the second information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

17. The method according to claim 13, characterized in that The second information is used to indicate one or more OFDM symbols used for sending the SL PRS in the first time slot.

18. The method according to claim 17, characterized in that The second information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

19. The method according to claim 18, characterized in that The second information includes a resource index, and the resource index uniquely corresponds to the start symbol and / or the number of symbols.

20. The method according to claim 18, characterized in that The second information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

21. The method according to any one of claims 18 to 20, characterized in that The second information is further used to indicate a time slot interval of resources used for the SLPRS transmission.

22. The method according to claim 21, characterized in that The second information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

23. The method according to any one of claims 13 to 22, characterized in that The second information includes one or more of the following: PC5 high-layer signaling and side control information SCI.

24. The method according to claim 23, characterized in that In the case where the SL PRS is sent periodically, the second information is included in the PC5 high layer signaling.

25. The method according to claim 23, characterized in that In the case where the second information is included in the SCI, the SCI is carried on a physical sidelink control channel PSCCH, and the resources used for sending the SL PRS are also used to send the PSCCH.

26. The method according to any one of claims 13 to 25, characterized in that The second information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

27. The method according to any one of claims 13 to 26, characterized in that The resources used for sending SL PRS are selected by the first terminal device through autonomous resources, or obtained by receiving DCI and / or RRC layer signaling sent by a network device.

28. A communication method, characterized in that: include: The network device sends first information to the first terminal device; The first information is used to indicate resources used for sending a side positioning reference signal SL PRS.

29. The method according to claim 28, characterized in that The first information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, wherein M is an integer greater than or equal to 1.

30. The method according to claim 29, characterized in that The first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of PRS resources used for the SL PRS transmission.

31. The method according to claim 29 or 30, characterized in that In a case where a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

32. The method according to claim 28, characterized in that The first information is used to indicate one or more OFDM symbols used for sending the SL PRS in a first time slot.

33. The method according to claim 32, characterized in that The first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

34. The method according to claim 33, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

35. The method according to claim 33, characterized in that The first information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

36. The method according to any one of claims 33 to 35, characterized in that The first information is also used to indicate a time slot interval of resources used for sending the SL PRS.

37. The method according to claim 36, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

38. The method according to any one of claims 28 to 37, characterized in that The first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

39. The method according to any one of claims 28 to 38, characterized in that The first information includes one or more of the following: downlink control information DCI, and radio resource control RRC layer signaling.

40. A communication method, characterized in that: include: The second terminal device receives the second information sent by the first terminal device; The second information is used to indicate resources used for sending a sideline positioning reference signal SL PRS.

41. A terminal device, characterized in that: The terminal device is a first terminal device, and the terminal device includes: A receiving unit, configured to receive first information sent by a network device; The first information is used to indicate resources used for sending a side positioning reference signal SL PRS.

42. The terminal device according to claim 41, characterized in that: The first information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, wherein M is an integer greater than or equal to 1.

43. The terminal device according to claim 42, characterized in that: The first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS sending.

44. The terminal device according to claim 42 or 43, characterized in that: In a case where a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

45. The terminal device according to claim 41, characterized in that: The first information is used to indicate one or more OFDM symbols used for sending the SL PRS in a first time slot.

46. ​​The terminal device according to claim 45, characterized in that: The first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

47. The terminal device according to claim 46, characterized in that: The first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

48. The terminal device according to claim 46, characterized in that: The first information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

49. The terminal device according to any one of claims 46 to 48, characterized in that: The first information is also used to indicate a time slot interval of resources used for sending the SL PRS.

50. The terminal device according to claim 49, characterized in that: The first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

51. The terminal device according to any one of claims 41 to 50, characterized in that: The first information includes one or more of the following: downlink control information DCI, and radio resource control RRC layer signaling.

52. The terminal device according to any one of claims 41 to 51, characterized in that: The first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

53. A terminal device, characterized in that: The terminal device is a first terminal device, and the terminal device includes: A first sending unit, configured to send second information to a second terminal device; The second information is used to indicate resources used for sending a sideline positioning reference signal SL PRS.

54. The terminal device according to claim 53, characterized in that: The second information is used to indicate the sending of M SL PRS resources for the SL PRS in a first time slot, wherein the first time slot includes one or more SL PRS resources, and the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, wherein M is an integer greater than or equal to 1.

55. The terminal device according to claim 54, characterized in that: The second information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS transmission.

56. The terminal device according to claim 54 or 55, characterized in that: In a case where a plurality of SL PRS resources included in the first time slot overlap, the second information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

57. The terminal device according to claim 53, characterized in that: The second information is used to indicate one or more OFDM symbols used for sending the SL PRS in the first time slot.

58. The terminal device according to claim 57, characterized in that: The second information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

59. The terminal device according to claim 58, characterized in that: The second information includes a resource index, and the resource index uniquely corresponds to the start symbol and / or the number of symbols.

60. The terminal device according to claim 58, characterized in that: The second information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

61. The terminal device according to any one of claims 58 to 60, characterized in that: The second information is further used to indicate a time slot interval of resources used for sending the SL PRS.

62. The terminal device according to claim 61, characterized in that: The second information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

63. The terminal device according to any one of claims 53 to 62, characterized in that: The second information includes one or more of the following: PC5 high-layer signaling and side control information SCI.

64. The terminal device according to claim 63, characterized in that: In the case where the SL PRS is sent periodically, the second information is included in the PC5 high layer signaling.

65. The terminal device according to claim 63, characterized in that: In the case where the second information is included in the SCI, the SCI is carried on a physical sidelink control channel PSCCH, and the resources used for sending the SL PRS are also used to send the PSCCH.

66. The terminal device according to any one of claims 53 to 65, characterized in that: The second information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

67. The terminal device according to any one of claims 53 to 66, characterized in that: The resources used for sending SL PRS are selected by the first terminal device through autonomous resources, or obtained by receiving DCI and / or RRC layer signaling sent by a network device.

68. A network device, characterized in that: include: A second sending unit, configured to send first information to a first terminal device; The first information is used to indicate resources used for sending a side positioning reference signal SL PRS.

69. The network device according to claim 68, characterized in that The first information is used to indicate M SL PRS resources used for the SL PRS transmission in a first time slot, the first time slot includes one or more SL PRS resources, the SL PRS resources include one or more orthogonal frequency division multiplexing OFDM symbols, wherein M is an integer greater than or equal to 1.

70. The network device according to claim 69, characterized in that The first information includes an index of a first SL PRS resource of the M SL PRS resources and the number of SL PRS resources used for the SL PRS sending.

71. The network device according to claim 69 or 70, characterized in that: In a case where a plurality of SL PRS resources included in the first time slot overlap, the first information is used to indicate a SL PRS resource used for the SL PRS transmission in the first time slot.

72. The network device according to claim 68, characterized in that The first information is used to indicate one or more OFDM symbols used for sending the SL PRS in a first time slot.

73. The network device according to claim 72, characterized in that The first information is used to indicate a starting symbol of the one or more OFDM symbols and / or the number of symbols of the one or more OFDM symbols.

74. The network device according to claim 73, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the starting symbol and / or the number of symbols.

75. The network device according to claim 73, characterized in that The first information includes a first indication, where the first indication is used to indicate that one of a plurality of candidate symbol numbers is the symbol number.

76. The network device according to any one of claims 73-75, characterized in that: The first information is also used to indicate a time slot interval of resources used for sending the SL PRS.

77. The network device according to claim 76, characterized in that The first information includes a resource index, and the resource index uniquely corresponds to the time slot interval.

78. The network device according to any one of claims 68 to 77, characterized in that: The first information includes a time interval indication field and / or a time domain resource allocation indication field, and the time interval indication field and / or the time domain resource allocation indication field are used to indicate a time slot for sending the SL PRS.

79. The network device according to any one of claims 68 to 78, characterized in that: The first information includes one or more of the following: downlink control information DCI, and radio resource control RRC layer signaling.

80. A terminal device, characterized in that: The terminal device is a second terminal device, and the terminal device includes: A second receiving unit, configured to receive second information sent by the first terminal device; The second information is used to indicate resources used for sending a sideline positioning reference signal SL PRS.

81. A terminal device, characterized in that: It comprises a memory and a processor, the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method as described in any one of claims 1-27 and 40.

82. A network device, characterized in that: It comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the network device executes the method as described in any one of claims 28-39.

83. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 40.

84. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 40.

85. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 40.

86. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 40.

87. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 40.

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