Lateral communication method and terminal equipment

Abstract

The invention provides a method for sidewalk communication and terminal equipment. The method comprises: a first terminal device sends or receives a first sideline reference signal in a first time slot, the first sideline reference signal being used for sideline positioning, and compared with a traditional scheme in which a transmission mode of the first sideline reference signal is not specified, the method is helpful for realizing sideline positioning based on the first sideline reference signal.

Description

Method and terminal equipment for sideline communication Technical Field

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

[0002] Some communication systems, such as new radio (NR) systems, hope to introduce sidelink-based positioning to enhance positioning technology. In other words, a reference signal for sidelink positioning (also known as a "sidelink positioning reference signal (SL PRS)") can be transmitted in the sidelink. However, how a terminal device receives and / or sends the SL PRS is not yet clear.

[0003] Summary of the Invention

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

[0005] In a first aspect, a method for sideline communication is provided, comprising: a first terminal device sending or receiving a first sideline reference signal in a first time slot, wherein the first sideline reference signal is used for sideline positioning.

[0006] According to a second aspect, a terminal device is provided, comprising: a communication unit configured to send or receive a first sideline reference signal in a first time slot, wherein the first sideline reference signal is used for sideline positioning.

[0007] In a third aspect, a terminal device is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, and the annotation processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal executes the method as described in any one of the first aspects.

[0008] In a fourth aspect, a device is provided, comprising a processor, configured to call a program from a memory so that the device executes the method as described in any one of the first aspects.

[0009] In a fifth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes a method as described in any one of the first aspects.

[0010] In a sixth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in any one of the first aspects.

[0011] In a seventh aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in any one of the first aspects.

[0012] In an eighth aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in any one of the first aspects.

[0013] In the present application, the first terminal device can send or receive a first sideways reference signal for sideways positioning in a first time slot, which helps to achieve sideways positioning based on the first sideways reference signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0015] FIG2 is a diagram showing an example of a sideline communication scenario within network coverage.

[0016] FIG3 is an example diagram of a side communication scenario with partial network coverage.

[0017] FIG4 is a diagram showing an example of a side communication scenario outside network coverage.

[0018] FIG5 is a diagram showing an example of a side communication scenario based on a central control node.

[0019] FIG6 is a diagram illustrating an example of a broadcast-based sideline communication method.

[0020] FIG. 7 is an exemplary diagram of a sideline communication method based on unicast.

[0021] FIG8 is an example diagram of a sideline communication method based on multicast.

[0022] FIG9 is a diagram showing an example of a time slot structure of a sideline communication system.

[0023] FIG10 is a diagram showing an example of the structure of the second-order SCI in a time slot.

[0024] FIG11 is an example diagram of the time domain positions of PSCCH DMRS symbols within a time slot.

[0025] FIG12 is an example diagram of single-symbol DMRS frequency domain type 1. FIG.

[0026] FIG13 is a diagram showing an example of resource mapping of PT-RS when PSCCH and second-order SCI exist in a time slot.

[0027] FIG. 14 is a diagram illustrating an example of resources for transmitting a DL PRS.

[0028] FIG15 is a schematic diagram of the structure of an interleaved resource block.

[0029] FIG16 is a diagram showing an example of a frame structure of the SL-U system.

[0030] FIG17 is a diagram showing an example of an RB set.

[0031] FIG18 is a schematic flowchart of a method for sideline communication provided in an embodiment of the present application.

[0032] FIG19 is a schematic diagram of PRS transmission in an embodiment of the present application.

[0033] FIG20 is another schematic diagram of PRS transmission in an embodiment of the present application.

[0034] Figure 21 is a structural diagram of the terminal device provided in an embodiment of the present application.

[0035] Figure 22 is a structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solution in this application will be described below with reference to the accompanying drawings.

[0037] Communication system architecture

[0038] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 within the coverage area.

[0039] FIG1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For a network device 110, the one or more terminal devices 120 may all be located within the network coverage of the network device 110, or all be located outside the network coverage of the network device 110, or some may be located within the coverage of the network device 110 and others outside the network coverage of the network device 110. This is not limited in the embodiments of the present application.

[0040] 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.

[0041] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the fifth generation (5G) system or 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.

[0042] The terminal device 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, 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 sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0043] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and 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 refer to a radio access network (RAN) node (or device) that connects a 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.

[0044] 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.

[0045] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0046] 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.

[0047] 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).

[0048] Sideline communication under different network coverage conditions

[0049] Sidelink communication refers to a communication technology based on a sidelink. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In traditional cellular systems, communication data is received or sent between terminal devices and network devices, while sidelink communication supports direct communication and data transmission between terminal devices. Compared with traditional cellular communication, direct communication data transmission between terminal devices can have higher spectrum efficiency and lower transmission latency. For example, the vehicle networking system adopts sidelink communication technology.

[0050] In side communication, according to the network coverage of the terminal device, the side communication can be divided into side communication within the network coverage, side communication with partial network coverage, and side communication outside the network coverage.

[0051] Figure 2 illustrates an example scenario for sidelink communication within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage of network device 110. Therefore, both terminal devices 120a can receive configuration signaling from network device 110 (configuration signaling in this application can also be replaced by configuration information) and determine the sidelink configuration based on the configuration signaling from network device 110. After both terminal devices 120a have configured their sidelinks, sidelink communication can proceed on the sidelink.

[0052] Figure 3 is an example diagram of a sidelink communication scenario with partial network coverage. In the scenario shown in Figure 3, terminal device 120a performs sidelink communication with terminal device 120b. Terminal device 120a is located within the coverage range of network device 110, so terminal device 120a can receive the configuration signaling of network device 110 and determine the sidelink configuration based on the configuration signaling of network device 110. Terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of network device 110. In this case, terminal device 120b can determine the sidelink configuration based on pre-configuration information and / or information carried in the physical sidelink broadcast channel (PSBCH) sent by terminal device 120a within the network coverage. After both terminal device 120a and terminal device 120b perform sidelink configuration, sidelink communication can be performed on the sidelink.

[0053] Figure 4 illustrates an example scenario for sidelink communication outside of network coverage. In the scenario shown in Figure 4, both terminal devices 120b are outside of network coverage. In this scenario, both terminal devices 120b can determine the sidelink configuration based on pre-configured information. After both terminal devices 120b have configured their sidelinks, sidelink communication can proceed over the sidelink.

[0054] Sideline communication based on central control node

[0055] Figure 5 is an example diagram of a sideline communication scenario based on a central control node. In this sideline communication scenario, multiple terminal devices can form a communication group, and the communication group has a central control node. The central control node can be a terminal device in the communication group (such as terminal device 1 in Figure 5), and the terminal device can also be called a cluster head (CH) terminal device. The central control node can be responsible for completing one or more of the following functions: establishing a communication group, joining and leaving group members of the communication group, coordinating resources within the communication group, allocating sideline transmission resources to other terminal devices, receiving sideline feedback information from other terminal devices, and coordinating resources with other communication groups.

[0056] Data transmission method of side communication

[0057] Some sidewalk communication systems (such as long-term evolution vehicle to everything (LTE-V2X)) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). For broadcast transmission, the receiving terminal can be any terminal device around the transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device around terminal device 1, for example, terminal device 2 to terminal device 6 in Figure 6.

[0058] In addition to broadcast transmission, some communication systems also support unicast-based data transmission (hereinafter referred to as unicast transmission) and / or multicast-based data transmission (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) hopes to support autonomous driving. Autonomous driving places higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc. Therefore, in order to improve the performance of data interaction between vehicles, NR-V2X introduces unicast transmission and multicast transmission.

[0059] For unicast transmission, there is typically only one receiving terminal. For example, in Figure 7, unicast transmission occurs between terminal devices 1 and 2. Terminal device 1 can be the sending terminal, and terminal device 2 can be the receiving terminal, or vice versa.

[0060] For multicast transmission, the receiving terminal can be a terminal device within a communication group, or a terminal device within a certain transmission distance. For example, in Figure 8, terminal devices 1, 2, 3, and 4 form a communication group. If terminal device 1 sends data, all other terminal devices in the group (terminal devices 2 through 4) can be receiving terminals.

[0061] NR-V2X time slot structure

[0062] The NR-V2X system has lower latency than the LTE-V2X system. Therefore, the multiplexing method of the physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) of the NR-V2X system has been redesigned compared to the LTE-V2X system. The time domain resource allocation of NR-V2X is based on time slots. Within a time slot, the first orthogonal frequency division multiplexing (OFDM) symbol is fixed for automatic gain control (AGC). On the AGC symbol, the UE can copy the information sent on the second symbol. At the end of the time slot, a symbol is reserved for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state.

[0063] In the NR-V2X system, PSSCH and its associated PSCCH are transmitted in the same time slot. Except for the AGC symbol, PSCCH can occupy 2 or 3 OFDM symbols, and the PSCCH time domain position can start from the second time domain symbol among the time domain symbols available for sideline transmission in the time slot (the first time domain symbol is the AGC symbol).

[0064] The number of physical resource blocks (PRBs) occupied by the PSCCH in the frequency domain is configurable. For example, the PSCCH can occupy {10, 12, 15, 20, 25} PRBs in the frequency domain. In the frequency domain, the number of PRBs occupied by the PSCCH is within the range of a PSSCH subband. If the number of PRBs occupied by the PSCCH is less than the size of a PSSCH subchannel, or the PSSCH frequency domain resources include multiple subchannels, the PSCCH can be frequency-division multiplexed with the PSSCH in the OFDM symbol where the PSCCH is located.

[0065] In the NR-V2X system, the parameters sl-startSLsymbols and sl-lengthSLsymbols can be used to configure the start and length of the time domain symbols (abbreviated as symbols) used for sidelink transmission in a time slot. The last symbol of the symbols used for sidelink transmission in a time slot configured by the parameters sl-startSLsymbols and sl-lengthSLsymbols is used as the guard period (GP). PSSCH and PSCCH can only use the remaining time domain symbols.

[0066] In some embodiments, in addition to PSCCH and PSSCH, a physical sidelink feedback channel (PSFCH) may also exist in a sidelink timeslot in NR-V2X. If PSFCH transmission resources are configured in a timeslot, PSSCH and PSCCH cannot occupy the symbol used for PSFCH transmission, as well as the AGC and GP symbols preceding that symbol.

[0067] Figure 9 shows an example diagram of the time slot structure of some sideline communication systems (such as NR-V2X systems). As shown in Figure 9, the network configuration parameters sl-StartSymbol=3, sl-LengthSymbols=11, that is, the 11 symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in this time slot. The PSFCH occupies symbols 11 and 12, where symbol 11 is used as the AGC symbol of the PSFCH, and symbols 10 and 13 are used as GPs respectively. Therefore, the symbols that can be used for PSSCH transmission are symbols 3 to 9, where the PSCCH occupies 3 time domain symbols, that is, the PSCCH occupies symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0068] PSSCH can be used to carry second-order sidelink control information (SCI) and sidelink shared channel (SL-SCH). The second-order SCI may include different SCI formats. For example, two second-order SCI formats are defined in 3GPP R16, namely SCI format 2-A and SCI format 2-B. SCI format 2-B is applicable to multicast communication modes that perform sidelink hybrid automatic repeat request (HARQ) feedback based on distance information; SCI format 2-A is applicable to other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication modes that require sidelink HARQ feedback, and multicast communication modes that require feedback of positive acknowledgment (ACK) or negative acknowledgment (NACK). In 3GPP R17, an additional second-order SCI format, namely SCI format 2-C, is introduced to indicate reference resource sets and trigger signaling in specific circumstances.

[0069] Figure 10 shows an example of the second-order SCI structure in a time slot. As shown in Figure 10, the modulation symbols of the second-order SCI are mapped starting from the symbol containing the first PSSCH modulation and demodulation reference signal, first in the frequency domain and then in the time domain. This symbol is then interleaved and multiplexed with the resource elements (REs) of the demodulation reference signal (DMRS). Furthermore, the modulation symbols of the second-order SCI cannot be mapped to the REs containing the phase tracking reference signal (PT-RS).

[0070] In the sidewalk communication system, the UE's autonomous resource selection or the determination of transmission resources based on the network's sidewalk resource scheduling may cause different UEs to send PSCCH on the same time-frequency resources. In order to ensure that the receiver can detect at least one PSCCH in the event of a PSCCH resource conflict, LTE-V2X adopts a PSCCH DMRS randomization design scheme. Specifically, when sending PSCCH, the UE can randomly select a value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple UEs use different cyclic shifts to send PSCCH DMRS on the same time-frequency resources, the receiving UE can still detect at least one PSCCH through the orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCC) for the transmitting UE to randomly select, as shown in Table 1, where the i-th bit of the OCC mask is applied to the i-th DMRS RE in the resource block (RB), thereby achieving the effect of distinguishing different UEs.

[0071] Table 1

[0072] The DMRS of PSSCH in some sideline communication systems (such as NR-V2X systems) draws on the design of the NR Uu interface and adopts multiple time-domain PSSCH DMRS patterns. In a resource pool, the number of DMRS patterns that can be used is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and the number of PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol in the pattern are shown in Table 2. Figure 11 shows a schematic diagram of the time domain position of 4 DMRS symbols in a time slot when the PSSCH has 13 symbols.

[0073] Table 2

[0074] In some embodiments, if multiple time-domain DMRS patterns are configured within a resource pool, the specific time-domain DMRS pattern to be used can be selected by the transmitting UE and indicated in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring channel estimation accuracy; while for low-speed UEs, a low-density DMRS pattern can be used, thereby improving spectrum efficiency.

[0075] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, p i The i-th cyclic redundancy check (CRC) bit of the PSCCH that schedules the PSSCH is L, which is the number of bits of the PSCCH CRC, for example, L=24.

[0076] 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 12 is an example diagram of a single-symbol DMRS frequency domain type 1.

[0077] PT-RS in NR-V2X

[0078] NR-V2X supports PT-RS in FR2. The PT-RS in the NR-V2X system largely borrows the OFDM-based PT-RS design used in the Uu uplink, including the PT-RS sequence and time-frequency density. In the NR-V2X system, the antenna port used by the PT-RS is the same as the DMRS of the PSSCH transmitted with it. If the PSSCH uses two transmit ports, each PT-RS port is uniquely associated with a PSSCH DMRS port.

[0079] The PT-RS sequence uses the DMRS sequence associated with the first PSSCH DMRS symbol in the time slot. During the PT-RS physical resource mapping process, the time domain interval can be 1, 2, or 4 OFDM symbols. The transmitter and receiver will determine the PT-RS time domain interval based on the modulation and coding scheme (MCS) threshold configured in the resource pool and the MCS used by the transmitted / received PSSCH. This is shown in Table 3, where ptrs-MCS1 to ptrs-MCS4 are the MCS thresholds configured by the radio resource control (RRC) layer in the current resource pool. The PT-RS frequency domain interval can be 2 or 4 PRBs, determined by the bandwidth threshold configured by the RRC layer and the PSSCH transmission bandwidth, as shown in Table 4, where NRB0 and NRB1 are the bandwidth thresholds configured by the RRC layer in the current resource pool.

[0080] Table 3

[0081] Table 4

[0082] In order to reduce the probability of different terminals sending PT-RS on the same resources, within a given PT-RS frequency domain interval, the CRC of the PSCCH that schedules the PSSCH will be used to determine on which PRB to send the PT-RS. The RE position of the PT-RS on this PRB is determined by the RRC-configured RE offset parameter and the DMRS port associated with the PT-RS, as shown in Table 5.

[0083] Table 5

[0084] In addition, if the PT-RS transmission RE determined according to the above rules overlaps with the RE occupied by the PSCCH or PSSCH DMRS, the PT-RS on the overlapping RE will be punctured. If the transmitting terminal also transmits the channel state information reference signal (CSI-RS), it also needs to avoid overlapping with the PT-RS when determining the CSI-RS transmission RE. Figure 13 shows an example, in which the PSSCH DMRS port associated with the PT-RS is 1000, the RE offset is 00, and the time domain interval of the PT-RS is 1 OFDM symbol.

[0085] CSI-RS in NR-V2X

[0086] To better support unicast communication, NR-V2X supports CSI-RS. CSI-RS will only be sent when the following three conditions are met: the UE sends the corresponding PSSCH, that is, the UE cannot send only CSI-RS; high-layer signaling activates sidelink channel state information (CSI) reporting; when high-layer signaling activates sidelink CSI reporting, the corresponding bit in the second-order SCI sent by the UE triggers sidelink CSI reporting.

[0087] Because the PSSCH on the NR sidelink only supports dual-stream transmission, the maximum number of CSI-RS ports is 2. The NR sidelink only supports CSI-RS transmission with a density of 1, that is, for any port, there is only one CSI-RS on a PRB. In one transmission, the number of CSI-RS ports and the time-frequency domain location of the RE used to transmit the CSI-RS are determined by the transmitting terminal and notified to the receiving UE through PC5-RRC.

[0088] The time-frequency resource location information of the CSI-RS indicated by PC5-RRC includes the RE frequency domain position and time domain starting symbol of the CSI-RS. The time slot where the CSI-RS is located is the same as the time slot where the SCI that triggers the CSI report is located. The CSI-RS type is assumed to be non-zero-power (NZP) CSI-RS. In order to avoid affecting the resource mapping of PSCCH and second-order SCI, the CSI-RS cannot conflict with the time-frequency resources where the PSCCH is located, nor can it be sent in the same OFDM symbol as the second-order SCI. Since the channel estimation accuracy of the OFDM symbol where the PSSCH DMRS is located is higher, and the CSI-RS of the two ports will occupy two consecutive REs in the frequency domain, the CSI-RS cannot be sent in the same OFDM symbol as the DMRS of the PSSCH. In addition, the CSI-RS cannot conflict with the PT-RS.

[0089] Downlink-based positioning

[0090] In downlink positioning, the downlink positioning reference signal (DL PRS) parameter configuration can include four layers: the positioning frequency layer (FL), the TRP layer, the PRS resource set, and the PRS resource. The following details the DL PRS parameter configuration.

[0091] The network device can provide the terminal device with DL PRS configurations for four positioning frequency layers. The parameter structure of each positioning frequency layer provides the following DL PRS configuration parameters: DL PRS subcarrier spacing; DL PRS cyclic prefix (CP) length; DL PRS frequency domain resource bandwidth; DL PRS frequency domain starting frequency position; DL PRS frequency domain reference point "Point A"; and DL PRS comb size "Comb-N".

[0092] The value of the frequency domain resource bandwidth of the DL PRS may be the number of PRBs allocated to the DL PRS. In some cases, the minimum value of the frequency domain resource bandwidth of the DL PRS may be 24 PRBs, and the granularity may be 4 PRBs. The maximum value of the frequency domain resource bandwidth of the DL PRS may be 272 PRBs.

[0093] The frequency domain starting frequency position of the DL PRS resource is used to indicate the index of the starting PRB of the DL PRS in the frequency domain resource allocation. The PRB index is defined relative to the frequency domain reference point "Point A" of the DL PRS.

[0094] The above DL PRS configuration parameters corresponding to each positioning frequency layer can be applied to all DL PRS resources contained in the positioning frequency layer. That is to say, in a positioning frequency layer, all DL PRS from multiple different TRPs can use the same subcarrier spacing and CP length, the same comb size, be sent on the same frequency subband, and occupy the same bandwidth. Such a design can support terminal devices to simultaneously receive and measure DL PRS from multiple different TRPs on the same frequency point.

[0095] In some scenarios, the parameters of the TRP layer may include an ID parameter for uniquely identifying and locating the TRP, such as the physical cell ID of the TRP, the NR cell global identifier (NCGI) of the TRP, the absolute radio frequency channel number (ARFCN) of the TRP, etc. Typically, up to two DL PRS resource sets can be configured in each TRP layer.

[0096] For each DL PRS resource set, the configuration parameters of the DL PRS resource set can be applied to all DL PRS resources contained in this DL PRS resource set. The configuration parameters of a DL PRS resource set include one or more of the following parameters: DL PRS resource set identification ID (expressed by "nr-DL-PRS-ResourceSetID"); DL PRS transmission period and time slot offset (expressed by "dl-PRS-Periodicity-and-ResourceSetSlotOffset"); DL PRS resource repetition factor (expressed by "dl-PRS-ResourceRepetitionFactor"); DL PRS resource repeated transmission time interval (expressed by "dl-PRS-ResourceTimeGap"); DL PRS muting configuration; and the number of OFDM symbols occupied by DL PRS resources (expressed by "dl-PRS-NumSymbols").

[0097] The transmission period and time slot offset of the above-mentioned DL PRS are used to indicate the time domain transmission behavior of all DL PRS resources in the DL PRS resource set. In some implementations, the minimum value of the configurable DL PRS transmission period is 4 milliseconds, and the maximum value of the configurable DL PRS transmission period is 10240 milliseconds. Currently, the configuration of DL PRS supports flexible subcarrier spacing including 15KHz, 30KHz, 60KHz and 120KHz. In the case of different subcarrier spacing, the configurable DL PRS transmission period value range can be the same. Figure 14 shows a schematic diagram of resources for transmitting DL PRS when the comb size is 2 and the RE offset is 0 and 1 respectively.

[0098] The repetition factor of the above-mentioned DL PRS resource is used to indicate the number of repeated transmissions of the DL PRS resource in each DL PRS transmission cycle. At present, the repeated transmission of the same DL PRS resource can be used by the terminal device to aggregate the DL PRS energy of multiple transmissions, which helps to increase the coverage distance of the DL PRS and improve the positioning accuracy. In the FR2 system, the repeated transmission of the DL PRS resource can also be used by the terminal device to perform receiving beam scanning operations. The terminal device can use different receiving beams to receive the repeated transmission of the same DL PRS resource, so as to find the best TRP transmission beam and terminal device receiving beam matching. On the other hand, the repeated transmission of DL PRS resources will increase the transmission overhead of DL PRS. At present, in order to control the transmission overhead, in the 3GPP NR R16 specification, the repetition factor of DL PRS resources is 1, 2, 4, 6, 8, 16 and 32.

[0099] The time interval for repeated transmission of the DL PRS resource is used to indicate the number of time slots between two consecutive repeated transmissions of the same DL PRS resource.

[0100] The above-mentioned DL PRS silence configuration is used to instruct DL PRS not to send DL PRS on certain allocated time-frequency resources. The silence configuration can be understood as DL PRS not being sent on all allocated time-frequency resources, but intentionally not being sent on certain designated time-frequency resources. On the one hand, the silence configuration can avoid conflicts between DL PRS and other signals (such as SSB). On the other hand, the silence configuration can avoid interference between signals sent by different TRPs. For example, the silence configuration can instruct the TRP that is closer to the terminal device not to send DL PRS, and configure the TRP that is farther away from the terminal device to send DL PRS. In this way, the terminal device can receive the DL PRS from the farther TRP without being interfered with by the TRP that instructs silence.

[0101] The number of OFDM symbols occupied by the DL PRS resource is used to indicate the number of OFDM symbols allocated to one DL PRS resource within one time slot.

[0102] Typically, the DL PRS configuration parameters included in the parameters of the above-mentioned TRP layer can be applied to all DL PRS resources in the DL PRS resource set corresponding to the TRP layer. Therefore, the DL PRS resources belonging to the same DL PRS resource set will send DL PRS with the same transmission period and the same number of repeated transmissions, and the DL PRS will occupy the same number of OFDM symbols.

[0103] In some implementations, for each DL PRS resource, the DL PRS configuration parameters may also include: DL PRS resource identification ID (expressed by "nr-DL-PRS-ResourceID"); DL PRS sequence ID (expressed by "dl-PRS-SequenceID"); DL PRS starting frequency domain resource unit offset (expressed by "dl-PRS-CombSizeN-AndReOffset"); DL PRS resource slot offset (expressed by "dl-PRS-ResourceSlotOffset"); DL PRS OFDM symbol offset (expressed by "dl-PRS-ResourceSymbolOffset"); DL PRS quasi co-location (QCL) information (expressed by "dl-PRS-QCL-Info").

[0104] The starting frequency domain resource unit offset of the DL PRS is used to indicate the frequency domain resource unit offset value used for resource mapping on the first allocated OFDM symbol of the DL PRS resource in a time slot. Generally, based on this parameter and the relative offset value defined in TS38.211, the terminal device can determine the frequency domain resource unit offset value used for resource mapping on each OFDM symbol.

[0105] The resource time slot offset of the DL PRS is used to indicate the time slot offset relative to the DL PRS resource set. This parameter can determine the time slot position of each DL PRS resource.

[0106] The OFDM symbol offset of the DL PRS is used to indicate the time-frequency resource allocation position of the DL PRS resource in a time slot. This parameter can be used to indicate the index number of the starting OFDM symbol in the time slot.

[0107] The QCL information of the DL PRS is used to indicate the QCL information of the DL PRS.

[0108] Sidelink over unlicensed spectrum (SL-U)

[0109] When performing sidelink transmission on unlicensed spectrum, sidelink transmission needs to meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB requirements, when the UE uses the channel for data transmission, the occupied channel bandwidth must be no less than 80% of the channel bandwidth; for maximum power spectral density requirements, the power transmitted by the UE per 1MHz cannot exceed 10dBm. To meet OCB and PSD regulatory requirements, sidelink transmission on unlicensed spectrum needs to adopt an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, and a total of M IRBs are included in the frequency band. The RBs included in the mth IRB are {m, M+m, 2M+m, 3M+m, ...}.

[0110] Figure 15 shows a schematic diagram of the interleaved resource block structure. As shown in Figure 15, the system bandwidth includes 20 RBs, including 5 IRBs (i.e., M = 5), each IRB includes 4 RBs (i.e., N = 4), and the frequency domain interval between two adjacent RBs in the same IRB is the same, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB index.

[0111] In the SL-U system, if IRB-based resource allocation granularity is adopted, channels such as the PSCCH and PSSCH in the SL-U system should all be based on the IRB structure. Figure 16 shows an example of the frame structure of the SL-U system. The example frame structure in Figure 16 is an example of a frame structure in which only the PSCCH and PSSCH are included in the time slot, without the PSFCH. As shown in Figure 16, the bandwidth includes 20 RBs, and 5 IRB resources are configured, i.e., M = 5. Each IRB resource includes 4 RBs, and the numbers in the boxes represent the IRB index. In Figure 16, the system configures the PSCCH to occupy one IRB resource and two OFDM symbols in the time domain. The PSSCH uses IRB granularity, with the first symbol in the time slot being an AGC symbol and the last symbol being a GP symbol. In Figure 16, PSSCH 1 occupies IRB #0 and IRB #1, and its corresponding PSCCH 1 occupies IRB #0. PSSCH 2 occupies IRB #2, and its corresponding PSCCH 2 also occupies IRB #2. It should be noted that, for simplicity, FIG16 does not illustrate the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0112] In unlicensed spectrum, UEs can access channels using listen-before-talk (LBT). LBT uses a 20MHz granularity in the frequency domain, with each 20MHz interval being called an RB Set. A carrier can contain multiple RB Sets, separated by guard intervals, as shown in Figure 17.

[0113] In unlicensed spectrum, UEs must first perform LBT before they can access the channel. However, the time it takes for the UE to complete LBT is uncertain. In some implementations, if a UE is restricted to transmitting only from the start of a timeslot, it may miss a transmission opportunity due to failure to complete LBT before that time. Therefore, SL-U considers adding a transmission starting point within a timeslot, i.e., multi-starting point transmission. For example, the additional starting point can be the third or fourth OFDM symbol in the timeslot.

[0114] Sidelink-based positioning

[0115] In 3GPP R-17, 3GPP RAN conducted studies on sidelink-based positioning, for example, on "NR positioning enhancement" and "scenarios and requirements for NR positioning use cases in coverage, partial coverage and out of coverage". Among them, the study on "scenarios and requirements for NR positioning use cases in coverage, partial coverage and out of coverage" focused on V2X and public safety use cases. In addition, some organizations (such as the 3GPP SA1 working group) have also developed requirements for "ranging-based services" and positioning accuracy requirements for IoT use cases in out-of-coverage scenarios. 3GPP needs to study and develop sidelink-based positioning solutions to support the use cases, scenarios and requirements identified in these activities.

[0116] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies of positioning technology based on sidestream positioning reference signals in the early stages of Release 18. Next, 3GPP will standardize solutions for sidestream positioning (including ranging and direction finding) in NR systems. This sidestream positioning solution primarily includes the following standardization work.

[0117] Standardization Work 1: Standardization of the Side Positioning Reference Signal (SL PRS). The SL PRS can use a frequency-domain structure based on a comb pattern (including full RE mapping mode) and a pseudo-random sequence format. The SL PRS can be designed based on the existing DL-PRS sequence and support a maximum SL PRS bandwidth of 100 MHz in FR1.

[0118] Standardization work 2: Standardization of measurements used for sideways positioning. For example, standardization supports measurements of SL round trip time (RTT), SL angle of arrival (AOA), and SL time difference of arrival (TDOA) positioning methods.

[0119] Standardization work three: Standardize the resource allocation scheme of SL PRS. For example, the resource allocation scheme of SL PRS includes resource allocation scheme 1 and scheme 2, where scheme 1 corresponds to the network allocating SL PRS resources, and scheme 2 corresponds to the UE autonomously selecting SL PRS resources. In some implementations, the system supports SL PRS and Rel-16 / 17 / 18 sideline communication shared resource pool and SL PRS dedicated resource pool. In some implementations, for scheme 2, it is necessary to study and standardize one or more of the following: resource selection based on channel sensing, random resource selection, congestion control, and resource selection based on UE coordination.

[0120] Standardization work 4: Standardize the open-loop power control mechanism for SL PRS transmission.

[0121] Currently, some communication systems (such as NR systems) hope to introduce sidelink-based positioning to enhance positioning technology. In other words, a reference signal for sidelink positioning (also known as a "sidelink positioning reference signal SL PRS") can be transmitted in the sidelink. However, how a terminal device receives and / or sends the SL PRS is not yet clear.

[0122] In response to the above problems, the present application provides a method for sideline communication. In this method, the first terminal device can send or receive a first sideline reference signal for sideline positioning in a first time slot, that is, the first terminal device can be a transmitter of the first sideline reference signal, or the first terminal device can be a receiver of the first sideline reference signal. In the embodiment of the present application, there is no specific limitation on the first terminal device. The first terminal device can be any terminal device related to sideline positioning. In some embodiments, the first terminal device can be a terminal device that sends a first sideline reference signal or receives a first sideline reference signal, or the first device can be a transmitting terminal of the first sideline reference signal or a receiving terminal of the first sideline reference signal. In some embodiments, the first terminal device can be other entities related to sideline positioning, such as a service terminal device (server UE).

[0123] In some implementations, the service terminal device can be used to determine the location information of the first terminal device. In other words, the function of the service terminal device is the same as that of the positioning server, and the service terminal device can implement some or all of the functions of the positioning server.

[0124] For ease of understanding, the method for sideline communication according to an embodiment of the present application is described below in conjunction with Figure 18. Figure 18 is a flow chart of the method for sideline communication according to an embodiment of the present application. The method shown in Figure 18 may include step S1810.

[0125] In step S1810, the first terminal device sends or receives a first sideways reference signal for sideways positioning in a first time slot.

[0126] For example, the first terminal device sends a first sideways reference signal for sideways positioning to other terminal devices in the first time slot. In another example, the first terminal device receives a first sideways reference signal for sideways positioning sent by other terminal devices in the first time slot.

[0127] In some implementations, the first sidelink reference signal is used for sidelink positioning. For example, the first sidelink reference signal can be used to locate a first terminal device. For another example, the first sidelink reference signal can be used to locate other terminal devices. In some scenarios, the first sidelink reference signal can be the SL PRS described above. Of course, the first reference signal can also be other reference signals that can be used for sidelink positioning, which is not limited in the embodiments of the present application.

[0128] In some implementations, the first sidelink reference signal may be transmitted based on resources in a shared resource pool. The shared resource pool may be understood as a shared resource pool used for both transmission of the first sidelink reference signal and sidelink communication. The shared resource pool used for sidelink communication may, for example, include resources for transmitting and receiving sidelink data and / or sidelink control information.

[0129] In other scenarios, the first sidelink reference signal may be transmitted based on resources in a dedicated resource pool. The dedicated resource pool may be understood as a resource pool dedicated to transmitting reference signals for sidelink positioning, or in other words, a resource pool dedicated to transmitting the first sidelink reference signal.

[0130] Whether in a dedicated resource pool or a shared resource pool, the time domain resources (e.g., OFDM symbols) occupied by the first sidelink reference signal may collide with the time domain resources used to transmit other sidelink signals (e.g., the second sidelink reference signal). At this time, how to transmit the first sidelink reference signal and the second sidelink reference signal is an urgent problem to be solved.

[0131] Therefore, in response to the above-mentioned problems, a transmission scheme for a sidelink reference signal is proposed in an embodiment of the present application, that is, the OFDM symbol occupied by the first sidelink reference signal can be used or not used to transmit the second sidelink reference signal, which helps to unify the understanding between the transmitter and receiver of the first reference signal, so as to improve the success rate of the transmission of the first reference signal.

[0132] In some implementations, the OFDM symbols occupied by the first sidelink reference signal can be used to transmit the second sidelink reference signal, that is, the OFDM symbols occupied by the first sidelink reference signal can partially or completely overlap with the OFDM symbols occupied by the second sidelink reference signal. For example, the OFDM symbols occupied by the first sidelink reference signal can be used entirely to transmit the second sidelink reference signal, or, in another example, the OFDM symbols occupied by the first sidelink reference signal can be partially used to transmit the second sidelink reference signal. In other words, the resources used to transmit the second sidelink reference signal can be mapped to the OFDM symbols occupied by the first sidelink reference signal.

[0133] If the OFDM symbol occupied by the first sidelink reference signal can be used to transmit a second sidelink reference signal, then the frequency domain resources occupied by the second sidelink reference signal in the OFDM symbol may be different from the frequency domain resources occupied by the first sidelink reference signal, which helps to avoid collision between the resources occupied by the first sidelink reference signal and the resources occupied by the second sidelink reference signal. For example, the RE occupied by the second sidelink reference signal in the OFDM symbol may be different from the RE occupied by the first sidelink reference signal. In other words, the RE occupied by the second sidelink reference signal and the RE occupied by the first sidelink reference signal may be located at different frequencies within the same OFDM symbol.

[0134] In some implementations, the OFDM symbol occupied by the first sidelink reference signal may not be used for transmitting the second sidelink reference signal. That is, the OFDM symbol occupied by the first sidelink reference signal and the OFDM symbol occupied by the second sidelink reference signal may not overlap, coincide, or be the same. For example, all REs within the OFDM symbol may not be used for transmitting the second sidelink reference signal. In other words, the resources used for transmitting the second sidelink reference signal may be skipped or not mapped to the OFDM symbol occupied by the first sidelink reference signal.

[0135] It should be noted that the embodiments of the present application are described using OFDM symbols as an example. Of course, the OFDM symbols in the embodiments of the present application can be replaced by other time domain units, such as time slots, frames, subframes, etc. Of course, it can also be some time domain unit introduced in future communication systems.

[0136] In addition, in an embodiment of the present application, the above-mentioned OFDM symbol for transmitting the first sidelink reference signal may be preconfigured, for example, the first terminal device may be preconfigured with the OFDM symbol for transmitting the first sidelink reference signal when leaving the factory. The above-mentioned OFDM symbol for transmitting the first sidelink reference signal may be predefined, for example, the OFDM symbol for transmitting the first sidelink reference signal may be predefined through a communication protocol. Alternatively, the above-mentioned OFDM symbol for transmitting the first sidelink reference signal may be preconfigured by a network device, for example, the network device may configure the OFDM symbol for transmitting the first sidelink reference signal for the first terminal device. This embodiment of the present application is not limited to this. Alternatively, the above-mentioned OFDM symbol for transmitting the first sidelink reference signal may be indicated by other terminals, for example, other terminals may send indication information to the first terminal device to indicate the OFDM symbol for transmitting the first sidelink reference signal. This embodiment of the present application is not limited to the indication information. In some implementations, the indication information may include high-layer signaling, for example, the high-layer signaling may include (service layer protocol profile, SLPP) layer signaling and / or RRC layer signaling.

[0137] It should be noted that in the embodiment of the present application, when the OFDM symbol used to transmit the first sidelink reference signal is preconfigured or configured, the OFDM symbol used to transmit the first sidelink reference signal can be determined based on the configuration information. The embodiment of the present application does not specifically limit the configuration information. For example, the configuration information may include the starting position of the OFDM symbol used to transmit the first sidelink reference signal and / or the number of OFDM symbols used to transmit the first sidelink reference signal.

[0138] In some implementations, the RE position of the first sidelink reference signal on the OFDM symbol it occupies may be determined based on preconfigured or configured information. For example, the first terminal device may determine the comb tooth size and / or RE offset of the first sidelink reference signal on the OFDM symbol it occupies in the first time slot based on the preconfigured or configured information, thereby further determining the RE position of the first sidelink reference signal on the OFDM symbol it occupies.

[0139] In the embodiments of the present application, the second sidelink reference signal is not specifically limited. For example, the second sidelink reference signal may include a CSI-RS and / or a PT-RS. For ease of understanding, the following describes the solutions of the embodiments of the present application in conjunction with Embodiments 1 and 2, taking the second sidelink reference signal as a CSI-RS or a PT-RS as an example.

[0140] Embodiment 1: The second sidelink reference signal is a CSI-RS. For ease of understanding, the following describes the transmission method between the first sidelink reference signal and the second sidelink reference signal in the embodiment of the present application in combination with Cases 1-1 to 1-3.

[0141] Case 1-1: The CSI-RS and the first sidelink reference signal are not transmitted in the same OFDM symbol.

[0142] In some implementations, the OFDM symbols occupied by the first sidelink reference signal are not used to transmit the CSI-RS. That is, the CSI-RS is not transmitted in the OFDM symbols occupied by the first sidelink reference signal, or in other words, the CSI-RS cannot be transmitted in the OFDM symbols occupied by the first sidelink reference signal. In this way, the OFDM symbols used to transmit the CSI-RS are different from the OFDM symbols occupied by the first sidelink reference signal, which helps avoid resource conflicts between the CSI-RS and the first sidelink reference signal.

[0143] For example, the OFDM symbols occupied by the resources used to transmit the SL PRS in time slot 1 are preconfigured or configured. At this time, terminal 1 sends PC5 RRC signaling to terminal 2 to indicate that the time-frequency resource used to transmit the CSI-RS (also known as "SL CSI-RS") is PRB1. Then, the OFDM symbols used for CSI-RS transmission in PRB1 cannot include the OFDM symbols occupied by the resources used to transmit the SL PRS in time slot 1.

[0144] In some implementations, the OFDM symbols occupied by the first sidelink reference signal include the first OFDM symbol. If the OFDM symbols occupied by the first CSI-RS include the first OFDM symbol, the first CSI-RS is not transmitted in the first time slot. The first OFDM symbol can be understood as an OFDM symbol in which a resource collision (or resource conflict) occurs between the first CSI-RS and the first sidelink reference signal, referred to as a "colliding OFDM symbol."

[0145] In the embodiment of the present application, the transmission method of the first CSI-RS is not limited. For example, if the OFDM symbol 1 where the first sidelink reference signal collides with the first CSI-RS is located in time slot 1, then the first sidelink reference signal occupies OFDM symbol 1 in time slot 1 for transmission, and the OFDM symbol occupied by the first CSI-RS may be located in time slot 2, where time slot 1 and time slot 2 are different time slots. For another example, if the OFDM symbol 1 where the first sidelink reference signal collides with the first CSI-RS is located in time slot 1, then the first sidelink reference signal occupies OFDM symbol 1 in time slot 1 for transmission, and the first CSI-RS may not be transmitted.

[0146] In the embodiment of the present application, the first OFDM symbol is not limited. For example, the first OFDM symbol may be multiple OFDM symbols among the OFDM symbols occupied by the first sidelink reference signal. For another example, the first OFDM symbol may be one or any OFDM symbol among the OFDM symbols occupied by the first sidelink reference signal.

[0147] In some implementations, not transmitting the first CSI-RS in the first time slot or abandoning the transmission of the first CSI-RS can be achieved by setting indication information related to the first CSI-RS. In some implementations, the indication information related to the first CSI-RS can be carried in the parameter CSI request (CSI request) field in the second-order SCI. For example, the value of the CSI request field can be set to 0 to indicate not transmitting or abandoning the transmission of the first CSI-RS.

[0148] For example, the OFDM symbols occupied by the resources used to transmit the SL PRS in time slot 2 are preconfigured or configured. In this case, Terminal 1 sends PC5 RRC signaling to Terminal 2 to indicate that the time-frequency resources used to transmit the CSI-RS are PRB2. If the SL PRS and CSI-RS are transmitted in the same OFDM symbol in PRB2, Terminal 1 can set the value of the CSI request field in the second-order SCI to 0 to indicate that the CSI-RS is not transmitted in time slot 2.

[0149] In some implementations, the receiving device of the first sidelink reference signal does not expect to receive the CSI-RS in the OFDM symbols occupied by the first sidelink reference signal. Accordingly, in some scenarios, the transmitting terminal of the first sidelink reference signal can indicate the resources of the first sidelink reference signal to the receiving device based on the needs of the receiving device, which helps avoid conflicts between the first sidelink reference signal and the CSI-RS.

[0150] For example, the OFDM symbol occupied by the first sidelink reference signal is OFDM symbol 1, the transmitting end device of the first sidelink reference signal is terminal 1, and the receiving end device of the first sidelink reference signal is terminal 2. Then, terminal 2 does not expect to receive CSI-RS in OFDM symbol 1 occupied by the first sidelink reference signal. Accordingly, terminal 1 will not instruct terminal 2 to transmit CSI-RS in OFDM symbol 1.

[0151] Case 1-2: The CSI-RS and the first sidelink reference signal are transmitted in the same OFDM symbol.

[0152] In some implementations, the OFDM symbol occupied by the first sidelink reference signal can be used to transmit the CSI-RS. That is, the CSI-RS can be transmitted in the OFDM symbol occupied by the first sidelink reference signal, or in other words, the CSI-RS can be transmitted in the OFDM symbol occupied by the first sidelink reference signal. In other words, within the first time slot, the OFDM symbol occupied by the CSI-RS and the OFDM symbol occupied by the first sidelink reference signal can overlap, which helps achieve frequency division multiplexing of the CSI-RS and the first sidelink reference signal within the same OFDM symbol, thereby increasing the resource multiplexing flexibility of the two reference signals.

[0153] For example, the OFDM symbols occupied by the resources used to transmit the SL PRS in time slot 3 are preconfigured or configured. At this time, terminal 1 sends PC5 RRC signaling to terminal 2 to indicate that the time-frequency resource used to transmit the CSI-RS is PRB3, and the OFDM symbols used for CSI-RS transmission in PRB3 can include the OFDM symbols occupied by the resources used to transmit the SL PRS in time slot 3.

[0154] In some implementations, the first sidelink reference signal and the first CSI-RS both occupy the second OFDM symbol, and in the second OFDM symbol, the first sidelink reference signal and the first CSI-RS occupy different REs. That is, within the first time slot, the first sidelink reference signal and the CSI-RS can occupy the same OFDM symbol, but cannot occupy the same RE in the same OFDM symbol, or in other words, the REs occupied by the two in the same OFDM symbol cannot overlap in the frequency domain. This helps increase resource reuse flexibility and also avoids resource conflicts between the first sidelink reference signal and the CSI-RS.

[0155] For example, the OFDM symbols occupied by the resources used to transmit SL PRS in time slot 4 are preconfigured or configured. And terminal 1 can determine the RE position of SL PRS on the OFDM symbol it occupies based on the preconfigured or configured information. At this time, terminal 1 sends PC5 RRC signaling to terminal 2 to indicate that the time-frequency resources used to transmit CSI-RS are PRB4. Then the OFDM symbol used for CSI-RS transmission in PRB4 can include the OFDM symbol occupied by the resources used to transmit SL PRS in time slot 4, but the RE used to transmit SL PRS and the RE used to transmit CSI-RS on this OFDM symbol are different.

[0156] It should be noted that the second OFDM symbol can be any one or some one of the same OFDM symbols occupied by the first sidelink reference signal and the first CSI-RS in the first time slot, that is, the OFDM symbols occupied by the first sidelink reference signal and the first CSI-RS both include the second OFDM symbol.

[0157] In some implementations, the transmitting device may select the comb tooth size and / or RE offset of the first sidelink reference signal in the first time slot to make the REs of the first sidelink reference signal and CSI-RS on the same OFDM symbol in the first time slot different, thereby avoiding overlapping transmission resources of the first sidelink reference signal and CSI-RS.

[0158] The following uses the SL PRS as the first sidelink reference signal as an example, as illustrated in conjunction with Figure 19. As shown in Figure 19, in the first time slot, the CSI-RS and SL PRS occupy the same OFDM symbol, OFDM symbol #8. In OFDM symbol #8, the CSI-RS occupies REs #4 and #5, and the SL PRS has a comb size of 4. By offsetting the REs of the SL PRS, overlap between the SL PRS and the CSI-RS can be avoided.

[0159] In some implementations, the transmit power corresponding to the second OFDM symbol is the same as the transmit power corresponding to the third OFDM symbol. The third OFDM symbol carries a reference signal for side positioning, and the third OFDM symbol does not carry a CSI-RS. That is, in the first time slot, the transmit power of the OFDM symbol that carries both the CSI-RS and the reference signal for side positioning is the same as the transmit power of the OFDM symbol that carries the reference signal for side positioning but does not carry the CSI-RS. For example, the transmitting end device may send the CSI-RS and the first side reference signal in OFDM symbol 1, and only send the first side reference signal on OFDM symbol 2, then the transmit power of the signal in OFDM symbol 1 is the same as the transmit power of the signal in OFDM symbol 2. The following describes the calculation method of the transmit power of the CSI-RS and the reference signal for side positioning in the second OFDM symbol in combination with Formula 1 and / or Formula 2.

[0160] In some implementations, for OFDM symbols where CSI-RS exists, the transmit power of SL PRS is determined by Formula 1: Among them, P SL-PRS,SL (i) represents the SL PRS transmit power in time slot i determined according to the SL PRS power control mechanism, assuming that the SL PRS and CSI-RS do not overlap in the time domain; Indicates the number of REs occupied by SL PRS in an RB in time slot i; Indicates the number of REs occupied by CSI-RS in one RB in time slot i; is the total number of REs occupied by SL PRS and CSI-RS in one RB in time slot i.

[0161] It should be noted that the above P SL-PRS,SL The value of (i) can be determined based on the SL PRS power control mechanism, wherein the SL PRS power control mechanism can be defined by the communication standard. Of course, in the embodiment of the present application, the above P SL-PRS,SL The value of (i) may be pre-configured or configured by the network device.

[0162] In some implementations, for an OFDM symbol in which a CSI-RS exists, the transmit power of the CSI-RS is determined by Formula 2: The relevant parameters in Formula 2 can be found in the relevant introduction of Formula 1, and are not repeated here for the sake of brevity.

[0163] As an example, the first sidelink reference signal may be an SL PRS, and the first time slot may be structured as shown in Figure 19. As shown in Figure 19, OFDM symbol #8 carries both the CSI-RS and the SL PRS, and OFDM symbol #9 carries the SL PRS but not the CSI-RS. The transmit power corresponding to OFDM symbol #8 is the same as the transmit power corresponding to OFDM symbol #9. The transmit power of the CSI-RS and SL PRS in OFDM symbol #8 may be determined based on Formulas 1 and 2 above.

[0164] In some implementations, if the CSI-RS is transmitted through multiple antenna ports, the CSI-RS transmit power is evenly distributed across the multiple antenna ports, where the CSI-RS transmit power can be determined based on the above formula 2, for example. For example, if the CSI-RS is transmitted through three antenna ports, the CSI-RS transmit power determined by the above formula is divided into three equal parts, and the three parts are used as the CSI-RS transmit power for each antenna port. Of course, in the embodiment of the present application, the CSI-RS transmit power is randomly distributed across the multiple antenna ports, and this embodiment of the present application is not limited to this.

[0165] In some implementations, the receiving device of the first sidelink reference signal does not expect the first sidelink reference signal to overlap with resources occupied by the CSI-RS. In some implementations, the resources may include frequency domain resources, such as REs. Accordingly, in some scenarios, the transmitting terminal of the first sidelink reference signal may indicate the resources of the first sidelink reference signal to the receiving device based on the needs of the receiving device, thereby helping to avoid conflicts between the first sidelink reference signal and the CSI-RS.

[0166] For example, the OFDM symbol occupied by the first sidelink reference signal is RE1 in OFDM symbol 1, the transmitting end device of the first sidelink reference signal is terminal 1, the receiving end device of the first sidelink reference signal is terminal 2, and terminal 2 does not expect to receive CSI-RS on RE1 in OFDM symbol 1. Accordingly, terminal 1 will not instruct terminal 2 to transmit CSI-RS on RE1 in OFDM symbol 1.

[0167] Case 1-3: The OFDM symbol where the CSI-RS exists is not used to transmit the first sidelink reference signal.

[0168] In some implementations, the OFDM symbols occupied by the first sidelink reference signal are indicated by the transmitting device of the first sidelink reference signal through a first signaling, and the OFDM symbols occupied by the CSI-RS in the first time slot are indicated by the transmitting device of the first sidelink reference signal through a second signaling, and the OFDM symbols indicated by the first signaling do not overlap with the OFDM symbols indicated by the second signaling.

[0169] That is to say, the OFDM symbols occupied by the CSI-RS and the OFDM symbols occupied by the first sidelink reference signal are both indicated by the transmitting device. Accordingly, the transmitting device can autonomously control the OFDM symbols occupied by the CSI-RS and the OFDM symbols occupied by the first sidelink reference signal to avoid overlapping, which helps to avoid resource collision between the CSI-RS and the SL PRS.

[0170] In some implementations, the first signaling may be higher-layer signaling, such as SLPP layer signaling or RRC layer signaling. The signaling may include information related to the OFDM symbols occupied by the first sidelink reference signal in the first time slot, such as parameters related to the OFDM symbols occupied by the first sidelink reference signal in the first time slot. For example, a parameter indicating the starting point of the OFDM symbol occupied by the first sidelink reference signal in the first time slot, and / or a parameter indicating the number of OFDM symbols occupied by the first sidelink reference signal in the first time slot.

[0171] In some implementations, the second signaling may be PC5 RRC signaling. The second signaling may include information related to the OFDM symbols occupied by the CSI-RS in the first time slot, such as parameters related to the OFDM symbols occupied by the CSI-RS in the first time slot. For example, a parameter indicating the starting point of the OFDM symbol occupied by the CSI-RS in the first time slot and / or a parameter indicating the number of OFDM symbols occupied by the CSI-RS in the first time slot.

[0172] For example, assuming that terminal 1 is a transmitting device of CSI-RS and SL PRS, the transmitting device can indicate, through signaling 1, that SL PRS occupies OFDM symbol 1. The transmitting device can indicate, through signaling 2, that CSI-RS occupies OFDM symbol 2. OFDM symbol 1 and OFDM symbol 2 do not overlap in the time domain.

[0173] Embodiment 2: the second sidelink reference signal is PT-RS.

[0174] In some implementations, the PT-RS may be associated with an antenna port of a PSSCH DMRS. For ease of understanding, the following describes the transmission method between the first sidelink reference signal and the second sidelink reference signal in the embodiment of the present application in conjunction with Case 2-1 and Case 2-2.

[0175] Case 2-1: The PT-RS is not transmitted in the OFDM symbol occupied by the first sidelink reference signal.

[0176] In other words, the orthogonal frequency division multiplexing (OFDM) symbols occupied by the first sidelink reference signal cannot be used to transmit the PT-RS, or in other words, the PT-RS is not transmitted in the OFDM symbols occupied by the first sidelink reference signal. In this way, resource conflict between the PT-RS and the first sidelink reference signal can be avoided by staggering the OFDM symbols occupied by the PT-RS and the first sidelink reference signal within a time slot.

[0177] In some implementations, both SL PRS and PT-RS can be transmitted within the allocated PSSCH resources, where SL PRS can occupy one or more OFDM symbols within the PSSCH resources, multiple OFDM symbols can be continuous in the time domain, or multiple OFDM symbols can be discrete in the time domain.

[0178] For example, terminal 1 may transmit SL PRS on OFDM symbol 1 within the PSSCH resource. Meanwhile, terminal 1 may transmit PT-RS (also known as "SL PT-RS") on OFDM symbol 2 within the PSSCH resource, where OFDM symbol 1 and OFDM symbol 2 are different OFDM symbols.

[0179] In some implementations, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first time slot. That is, if, in the first time slot, the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first time slot. In other words, transmission of the first PT-RS is abandoned in the first time slot, thereby avoiding the impact of resource conflicts on the transmission process of the first sidelink reference signal.

[0180] In the embodiment of the present application, there is no limitation on the transmission mode of the first PT-RS. For example, the first PT-RS can be transmitted in other time slots after the first time slot. Of course, in the embodiment of the present application, the first PT-RS can also be not transmitted.

[0181] In some implementations, the first sidelink reference signal and the PSSCH DMRS share the same antenna port, and the first sidelink reference signal is also used for phase tracking. Specifically, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first timeslot. In this case, phase tracking can be performed based on the first sidelink reference signal, which helps improve phase tracking accuracy and avoids the degradation of phase tracking accuracy caused by not transmitting the first PR-RS.

[0182] For example, assuming that the antenna ports of SL PRS and PSSCH DMRS are the same, when SL PRS and PT-RS are transmitted simultaneously within the allocated PSSCH resources, the OFMD symbols occupied by SL PRS and PT-RS within the allocated PSSCH resources overlap. At this time, terminal 1 sends SL PRS to terminal 2 within the allocated PSSCH resources, but abandons sending PT-RS within the allocated PSSCH resources. At this time, the transmitted SL PRS can be used for phase tracking.

[0183] In some implementations, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is transmitted in the fourth OFDM symbol in the first time slot. The fourth OFDM symbol is an OFDM symbol other than the OFDM symbol occupied by the first sidelink reference signal, which helps to reduce the impact on the phase tracking of the receiving device of the first sidelink reference signal. For example, assuming that PT-RS1 and SL PRS1 simultaneously occupy OFDM symbol #9 in time slot 5, Terminal 1 can transmit PT-RS1 on OFDM symbol #8 or OFDM symbol #11.

[0184] In some implementations, the fourth OFDM symbol is the first OFDM symbol following the OFDM symbol occupied by the first sidelink reference signal. In other words, in the time domain, the fourth OFDM symbol is the OFDM symbol following the OFDM symbol occupied by the first sidelink reference signal. This helps ensure the time-domain transmission density of the PT-RS, thereby avoiding impact on PSSCH reception and avoiding resource conflict between the PT-RS and the first sidelink reference signal.

[0185] For example, referring to FIG. 20 , assuming that PT-RS and SL PRS occupy OFDM symbol #8 at the same time, terminal 1 may transmit SL PRS on OFDM symbol #8 and send PT-RS on the first OFDM symbol after OFDM symbol #8, that is, send PT-RS on OFDM symbol #9.

[0186] In some implementations, the time domain position of the fourth OFDM symbol (or, the transmission opportunity of the PT-RS) may be based on the index l of the reference OFDM symbol. ref For example, the time domain position of the fourth OFDM symbol can be adjusted based on the index l of the reference OFDM symbol. ref For example, the index l of the reference OFDM symbol can be incremented in the order from early to late in the time domain. ref , to postpone the sending opportunity of the first PT-RS.

[0187] In some scenarios, if the adjusted fourth OFDM symbol may not belong to the PSSCH resource, the first PT-RS may not be transmitted on the fourth OFDM symbol. Conversely, if the adjusted fourth OFDM symbol belongs to the PSSCH resource, the first PT-RS may be transmitted on the fourth OFDM symbol. Of course, in the embodiment of the present application, if the fourth OFDM symbol does not belong to the PSSCH resource, the first PT-RS may also be transmitted on the fourth OFDM symbol.

[0188] In other scenarios, the adjusted fourth OFDM symbol may be used to transmit the PSSCH DMRS. In this case, to avoid collision between the first PT-RS and the PSSCH DMRS, the fourth OFDM symbol may not be used to transmit the first PT-RS. In the embodiments of the present application, there is no limitation on the transmission method of the first PT-RS. For example, the first PT-RS may be transmitted on other OFDM symbols after the fourth OFDM symbol.

[0189] As an example, taking the first sidelink reference signal being SL PRS as an example, the method of adjusting the index of the reference OFDM symbol in the embodiment of the present application is described. ref A scheme for adjusting the transmission opportunity of the first PT-RS.

[0190] If the SL PRS transmitter determines that an OFDM symbol used for PT-RS belongs to the SL PRS resource used in the current time slot, that is, the OFDM symbol is occupied by SL PRS, then the SL PRS is sent on the OFDM symbol, but the PT-RS is abandoned. The SL PRS transmitter can increase the reference OFDM symbol index l by ref The transmission opportunity of PT-RS is postponed to the first OFDM symbol #n after the SL PRS resource in sequence. If the OFDM symbol still belongs to the allocated PSSCH resource and the transmitting end device of SL PRS does not transmit PSSCH DMRS on the OFDM symbol, the transmitting end device of SL PRS uses OFDM symbol #n as a PT-RS transmission opportunity and transmits the PT-RS at the increased l ref Continue to determine the next SL PR-RS sending opportunity. The specific postponement method includes steps S2010-S2070.

[0191] In step S2010, set i=0, set l ref =0.

[0192] In step S2020, if max(l ref +(i-1)L PT-RS +1,l ref ),…,l ref +iLPT-RS If any OFDM symbol in the range is a SL PRS transmitting end device used to send the OFDM symbol of PSSCH DMRS, then set i = 1 and set l ref is the index of the OFDM symbol where the PSSCH DMRS is located. ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S2020.

[0193] In step S2030, if OFDM symbol 1 ref +iL PT-RS The transmitting end device of SL PRS is used to send OFDM symbols of SL PRS, then l ref Increase by 1. If OFDM symbol l ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S2030.

[0194] In step S2040, if OFDM symbol 1 ref +iL PT-RS If the transmitting device of SL PRS is used to send the OFDM symbol of PSSCH DMRS, then set i=1 and set l ref l ref +iL PT-RS If OFDM symbol l ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S2020; otherwise, execute step S2050.

[0195] In step S2050, l ref +iL PT-RS Join collection l.

[0196] In step S2060, i is increased by 1.

[0197] In step S2070, as long as OFDM symbol 1 ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S2020.

[0198] Among them, L PT-RS ∈{1,2,4}, represents the transmission interval of SL PRS in the time domain (in OFDM symbols), and the specific value is configured or pre-configured by the network.

[0199] In some implementations, the index l of the reference OFDM symbol will be ref After being set as the index of the fourth OFDM symbol, the index l of the reference OFDM symbol is refContinue to determine the subsequent PT-RS transmission opportunities.

[0200] As an example, taking the first sidelink reference signal as SL PRS as an example, it is explained how to increase the index of the reference OFDM symbol by non-sequentially increasing the index of the OFDM symbol. ref To postpone the sending opportunity of the first PT-RS.

[0201] If the SL PRS transmitter device determines that an OFDM symbol used for PT-RS belongs to the SL PRS resource used in the current time slot, that is, the OFDM symbol is occupied by the SL PRS, and the first OFDM symbol #n after the SL PRS resource still belongs to the allocated PSSCH resource, the SL PRS transmitter device will l ref Set to #n, and continue to determine the PT-RS transmission opportunities of OFDM symbol #n and thereafter. The specific postponement method includes steps S3010-S3060.

[0202] In step S3010, set i=0, set l ref =0.

[0203] In step S3020, if max(l ref +(i-1)L PT-RS +1,l ref ),…,l ref +iL PT-RS If any OFDM symbol in the range is a SL PRS transmitting end device used to send the OFDM symbol of PSSCH DMRS, then set i = 1 and set l ref is the index of the OFDM symbol where the PSSCH DMRS is located. ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S3020.

[0204] In step S3030, if OFDM symbol 1 ref +iL PT-RS If the SL PRS resource used by the current time slot of the SL PRS transmitter is set to i=0, set l ref =n, where n is the index of the first OFDM symbol after the SL PRS resource. If OFDM symbol n belongs to the allocated PSSCH resource, execute step S3020.

[0205] In step S3040, ref +iL PT-RS Join collection l.

[0206] In step S3050, i is increased by 1.

[0207] In step S3060, as long as OFDM symbol 1 ref +iL PT-RS If it is an allocated PSSCH resource, repeat step S3020.

[0208] Among them, L PT-RS ∈{1,2,4}, represents the transmission interval of SL PRS in the time domain (in OFDM symbols), and the specific value is configured or pre-configured by the network.

[0209] As an example, the first side reference signal is SL PRS, PT-RS L PT-RS = 4 as an example, as illustrated in Figure 20. As shown in Figure 20, according to the PT-RS transmission interval, starting from OFDM symbol #0, PT-RS can be transmitted on OFDM symbol #4, OFDM symbol #7, and OFDM symbol #11. However, due to the presence of the SL PRS on OFDM symbol #7, the PT-RS transmission opportunity is postponed according to the above-mentioned postponement method to OFDM symbol #9, which is the first OFDM symbol after the SL PRS resource.

[0210] The above describes a solution in which the PT-RS is not transmitted within the OFDM symbol occupied by the first sidelink reference signal in an embodiment of the present application. In some scenarios, the PT-RS may also be transmitted within the OFDM symbol occupied by the first sidelink reference signal. In other words, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the PT-RS associated with the antenna port of the first sidelink reference signal is transmitted.

[0211] Case 2-2: The PT-RS associated with the antenna port of the PSSCH DMRS (also referred to as the "second PT-RS") can be transmitted in the OFDM symbol occupied by the first sidelink reference signal.

[0212] In some implementations, if the RE occupied by the second PT-RS overlaps with the target RE occupied by the first sidelink reference signal, the second PT-RS is transmitted on the target RE. That is, if the overlapping OFDM symbols occupied by the second PT-RS and the first sidelink reference signal also overlap or are identical to the RE occupied by the second PT-RS and the first sidelink reference signal, the PT-RS is transmitted on the overlapping RE, and the first sidelink reference signal is not transmitted or is not transmitted on the overlapping RE. In other words, if the RE occupied by the second PT-RS overlaps with the target RE occupied by the first sidelink reference signal, the second PT-RS can puncture the first sidelink reference signal, thereby reducing the impact on the PT-RS resource determination method associated with the antenna port of the PSSCH DMRS.

[0213] For example, when terminal 1 sends SL PRS and the second PT-RS on the same OFDM symbol, if the SL PRS and the second PT-RS occupy the same RE, terminal 1 can only send the second PT-RS on the RE without sending SL PRS, that is, puncture the SL PRS.

[0214] It should be noted that the resources occupied by the second PT-RS and / or the resources occupied by the first sidelink reference signal may belong to the allocated PSSCH resources. For example, the first sidelink reference signal may occupy one or more OFDM symbols on the PSSCH resources. The multiple OFDM symbols may be multiple OFDM symbols that are continuous in the time domain. Of course, the multiple OFDM symbols may be multiple OFDM symbols that are discrete in the time domain.

[0215] The above solutions described in conjunction with embodiments 1 and 2 are applicable to the shared resource pool. The following describes a transmission solution for the first sidelink reference signal in a dedicated resource pool in conjunction with embodiment 3. The dedicated resource pool can be found in the above description and will not be described here for brevity.

[0216] Embodiment 3: Transmission scheme of the first sidelink reference signal and the third PT-RS.

[0217] In some implementations, the dedicated resource pool may also be used to transmit a third PT-RS, that is, the third PT-RS may also be transmitted in the dedicated resource pool of the first sidelink reference signal.

[0218] In the embodiments of the present application, the third PT-RS is not specifically limited. In some implementations, the third PT-RS may be a PT-RS associated with the antenna port of the first sidelink reference signal, or in other words, the spatial parameters for transmitting the third PT-RS are the same as the spatial parameters for transmitting the first sidelink reference signal.

[0219] In addition, in the embodiment of the present application, the resource configuration method of the third PT-RS is not limited. For example, the resources occupied by the third PT-RS (for example, the position of REs occupied in a PRB) can be configured or pre-configured.

[0220] In some implementations, the resource location occupied by the third PT-RS is associated with the comb tooth size of the first sidelink reference signal, or in other words, the resource location for transmitting the third PT-RS can be configured or pre-configured for different comb tooth sizes. In some implementations, different comb tooth sizes are associated with different resource locations for transmitting the third PT-RS. For example, the comb tooth size of the SL PRS may include 2 and 3, and the resource locations associated with the two comb tooth sizes for transmitting the third PT-RS are different. In other implementations, the resource locations associated with different comb tooth sizes for transmitting the third PT-RS are partially the same. Alternatively, the resource locations associated with different comb tooth sizes for transmitting the third PT-RS are the same. This embodiment of the present application is not limited to this.

[0221] In some implementations, the RE occupied by the third PT-RS is in the same RE position as at least one RE occupied by the first sidelink reference signal, that is, there is at least one overlap between the RE occupied by the third PT-RS and the RE occupied by the first sidelink reference signal.

[0222] In some implementations, the time domain interval of the third PT-RS is determined based on configuration information or pre-configuration information of the network device. In the embodiments of the present application, the time domain interval is not specifically limited. The time domain interval may, for example, refer to the number of OFDM symbols spaced in the time domain. Of course, in the embodiments of the present application, the time domain interval may, for example, refer to the duration of the interval.

[0223] In the embodiment of the present application, the above time domain interval can be preconfigured, predefined or configured by the network device. Of course, in order to simplify the configuration method of the time domain interval, the time domain interval can be defaulted to a first value, wherein the first value can be 1 OFDM symbol.

[0224] In addition, in an embodiment of the present application, to ensure that multiple third PT-RSs can have corresponding resources for transmission in the dedicated resource pool, the PRB spacing between the multiple third PT-RSs can be determined based on the number of transmission resources in the dedicated resource pool. Taking the transmission resources as PRBs as an example, the above time domain spacing can be determined based on the number of PRBs in the dedicated resource pool.

[0225] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 20. The device embodiment of the present application is described in detail below in conjunction with Figures 21 and 22. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0226] FIG21 is a schematic diagram of the structure of a terminal device according to an embodiment of the present application. The terminal device 2100 shown in FIG21 may be the first terminal device mentioned above, and the terminal device 2100 may include a communication unit 2110 .

[0227] The communication unit 2110 may be configured to send or receive a first sideways reference signal in a first time slot, where the first sideways reference signal is used for sideways positioning.

[0228] In some implementations, the orthogonal frequency division multiplexing (OFDM) symbol occupied by the first sidelink reference signal may be used or not used to transmit the second sidelink reference signal.

[0229] In some implementations, the second sidelink reference signal is a CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal is not used to transmit the CSI-RS.

[0230] In some implementations, the OFDM symbol occupied by the first sidelink reference signal includes the first OFDM symbol. If the OFDM symbol occupied by the first CSI-RS includes the first OFDM symbol, the first CSI-RS is not transmitted in the first time slot.

[0231] In some implementations, the receiving device of the first sidelink reference signal does not expect to receive a CSI-RS in the OFDM symbol occupied by the first sidelink reference signal.

[0232] In some implementations, the second sidelink reference signal is a CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal can be used to transmit the CSI-RS.

[0233] In some implementations, the first sidelink reference signal and the first CSI-RS both occupy the second OFDM symbol, and the first sidelink reference signal and the first CSI-RS occupy different REs.

[0234] In some implementations, the transmit power corresponding to the second OFDM symbol is the same as the transmit power corresponding to the third OFDM symbol, the third OFDM symbol carries a reference signal for sidetrack positioning, and the third OFDM symbol does not carry a CSI-RS.

[0235] In some implementations, the receiving device of the first sidelink reference signal does not expect the first sidelink reference signal to overlap with resources occupied by the CSI-RS.

[0236] In some implementations, the OFDM symbol occupied by the first sidelink reference signal is determined based on pre-configuration information or configuration information of the network device.

[0237] In some implementations, the OFDM symbols occupied by the first sidelink reference signal are indicated by the transmitting device of the first sidelink reference signal through a first signaling, and the OFDM symbols occupied by the CSI-RS in the first time slot are indicated by the transmitting device of the first sidelink reference signal through a second signaling, and the OFDM symbols indicated by the first signaling do not overlap with the OFDM symbols indicated by the second signaling.

[0238] In some implementations, the second sidelink reference signal is a PT-RS associated with an antenna port of a PSSCH DMRS, and the orthogonal frequency division multiplexing OFDM symbol occupied by the first sidelink reference signal is not used to transmit the PT-RS.

[0239] In some implementations, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first time slot.

[0240] In some implementations, the first sidelink reference signal and the PSSCH DMRS have the same antenna port, and the first sidelink reference signal is also used for phase tracking.

[0241] In some implementations, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is sent in the fourth OFDM symbol in the first time slot, and the fourth OFDM symbol is an OFDM symbol other than the OFDM symbol occupied by the first sidelink reference signal.

[0242] In some implementations, the fourth OFDM symbol is the first OFDM symbol following the OFDM symbol occupied by the first sidelink reference signal.

[0243] In some implementations, if the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the PT-RS associated with the antenna port of the first sidelink reference signal is transmitted.

[0244] In some implementations, the second sidelink reference signal is a second PT-RS associated with the antenna port of the PSSCH DMRS. If the RE occupied by the second PT-RS overlaps with the target RE occupied by the first sidelink reference signal, the second PT-RS is transmitted on the target RE.

[0245] In some implementations, the first sidelink reference signal is transmitted based on the first sidelink reference signal and a resource in a shared resource pool for sidelink communication.

[0246] In some implementations, the first sidelink reference signal is transmitted based on resources in a dedicated resource pool for first sidelink reference signals.

[0247] In some implementations, the dedicated resource pool is also used to transmit a third PT-RS.

[0248] In some implementations, the third PT-RS is associated with an antenna port of the first sidelink reference signal.

[0249] In some implementations, the RE position occupied by the third PT-RS within a PRB is determined based on configuration information or pre-configuration information of the network device.

[0250] In some implementations, the RE position occupied by the third PT-RS is associated with the comb tooth size of the first sidelink reference signal.

[0251] In some implementations, the REs occupied by the third PT-RS are in the same RE position as the at least one RE occupied by the first sidelink reference signal.

[0252] In some implementations, the time domain interval of the third PT-RS is determined based on configuration information or pre-configuration information of the network device.

[0253] In some implementations, the PRB interval of the third PT-RS is determined based on the number of PRBs included in the dedicated resource pool.

[0254] Figure 22 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 22 indicate that the unit or module is optional. Device 2200 may be used to implement the method described in the above method embodiment. Device 2200 may be a chip, a terminal device, or a network device.

[0255] The device 2200 may include one or more processors 2210. The processor 2210 may support the device 2200 to implement the method described in the above method embodiment. The processor 2210 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.

[0256] The apparatus 2200 may further include one or more memories 2220. The memories 2220 store programs that can be executed by the processor 2210, causing the processor 2210 to perform the methods described in the above method embodiments. The memories 2220 may be independent of the processor 2210 or integrated into the processor 2210.

[0257] The apparatus 2200 may further include a transceiver 2230. The processor 2210 may communicate with other devices or chips via the transceiver 2230. For example, the processor 2210 may transmit and receive data with other devices or chips via the transceiver 2230.

[0258] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal device according to the present invention, and the program enables a computer to execute the method executed by the terminal device according to the various embodiments of the present invention.

[0259] 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 device according to the present application, and the program causes a computer to execute the method performed by the terminal device according to each embodiment of the present application.

[0260] The embodiments of the present application also provide a computer program that can be applied to the terminal device of the embodiments of the present application, and the computer program enables a computer to execute the method executed by the terminal device in each embodiment of the present application.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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)).

[0274] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for sideline communication, characterized in that: include: The first terminal device sends or receives a first sideways reference signal in a first time slot, where the first sideways reference signal is used for sideways positioning.

2. The method according to claim 1, characterized in that The orthogonal frequency division multiplexing OFDM symbol occupied by the first sidelink reference signal may be used or not used to transmit the second sidelink reference signal.

3. The method according to claim 2, characterized in that The second sidelink reference signal is a channel state information reference signal CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal is not used for transmitting the CSI-RS.

4. The method according to claim 3, characterized in that The OFDM symbol occupied by the first sidelink reference signal includes a first OFDM symbol. If the OFDM symbol occupied by the first CSI-RS includes the first OFDM symbol, the first CSI-RS is not transmitted in the first time slot.

5. The method according to claim 3 or 4, characterized in that: The receiving end device of the first sidelink reference signal does not expect to receive the CSI-RS in the OFDM symbol occupied by the first sidelink reference signal.

6. The method according to claim 2, characterized in that The second sidelink reference signal is a CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal can be used to transmit the CSI-RS.

7. The method according to claim 6, characterized in that The first sidelink reference signal and the first CSI-RS both occupy the second OFDM symbol, and the first sidelink reference signal and the first CSI-RS occupy different resource elements RE.

8. The method according to claim 7, characterized in that The transmission power corresponding to the second OFDM symbol is the same as the transmission power corresponding to the third OFDM symbol, the third OFDM symbol carries a reference signal for sideline positioning, and the third OFDM symbol does not carry a CSI-RS.

9. The method according to any one of claims 6 to 8, characterized in that The receiving end device of the first sidelink reference signal does not expect the first sidelink reference signal to overlap with resources occupied by CSI-RS.

10. The method according to any one of claims 3 to 9, characterized in that The OFDM symbol occupied by the first sidelink reference signal is determined based on pre-configuration information or configuration information of a network device.

11. The method according to any one of claims 3 to 9, characterized in that The OFDM symbols occupied by the first sidelink reference signal are indicated by a transmitting device of the first sidelink reference signal through a first signaling, and the OFDM symbols occupied by the CSI-RS in the first time slot are indicated by a transmitting device of the first sidelink reference signal through a second signaling, and the OFDM symbols indicated by the first signaling do not overlap with the OFDM symbols indicated by the second signaling.

12. The method according to claim 2, characterized in that: The second sidelink reference signal is a phase tracking reference signal PT-RS associated with an antenna port of a physical sidelink shared channel demodulation reference signal PSSCH DMRS, and the OFDM symbol occupied by the first sidelink reference signal is not used to transmit the PT-RS.

13. The method according to claim 12, characterized in that If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first time slot.

14. The method according to claim 13, characterized in that The first sidelink reference signal and the PSSCH DMRS have the same antenna port, and the first sidelink reference signal is also used for phase tracking.

15. The method according to claim 12, characterized in that If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is sent in the fourth OFDM symbol in the first time slot, and the fourth OFDM symbol is an OFDM symbol other than the OFDM symbol occupied by the first sidelink reference signal.

16. The method according to claim 15, characterized in that The fourth OFDM symbol is the first OFDM symbol after the OFDM symbol occupied by the first sidelink reference signal.

17. The method according to claim 12, characterized in that If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the PT-RS associated with the antenna port of the first sidelink reference signal is transmitted.

18. The method according to claim 2, characterized in that The second sidelink reference signal is a second PT-RS associated with an antenna port of a PSSCH DMRS. If an RE occupied by the second PT-RS overlaps with a target RE occupied by the first sidelink reference signal, the second PT-RS is transmitted on the target RE.

19. The method according to any one of claims 1 to 18, characterized in that The first sidewalk reference signal is transmitted based on the first sidewalk reference signal and resources in a shared resource pool of sidewalk communication.

20. The method according to claim 1, characterized in that The first sidelink reference signal is transmitted based on resources in a dedicated resource pool for the first sidelink reference signal.

21. The method according to claim 20, characterized in that The dedicated resource pool is also used to transmit a third PT-RS.

22. The method according to claim 21, characterized in that The third PT-RS is associated with an antenna port of the first sidelink reference signal.

23. The method according to claim 21 or 22, characterized in that The RE position occupied by the third PT-RS in one PRB is determined based on configuration information or pre-configuration information of the network device.

24. The method according to any one of claims 21 to 23, characterized in that The RE position occupied by the third PT-RS is associated with the comb tooth size of the first sideline reference signal.

25. The method according to any one of claims 21 to 24, characterized in that The RE occupied by the third PT-RS is in the same RE position as at least one RE occupied by the first sidelink reference signal.

26. The method according to any one of claims 21 to 25, characterized in that The time domain interval of the third PT-RS is determined based on configuration information or pre-configuration information of the network device.

27. The method according to any one of claims 21 to 26, characterized in that The physical resource block (PRB) interval of the third PT-RS is determined based on the number of PRBs included in the dedicated resource pool.

28. A terminal device, characterized in that: include: The communication unit is used to send or receive a first sideways reference signal in a first time slot, where the first sideways reference signal is used for sideways positioning.

29. The terminal device according to claim 28, characterized in that: The orthogonal frequency division multiplexing OFDM symbol occupied by the first sidelink reference signal may be used or not used to transmit the second sidelink reference signal.

30. The terminal device according to claim 29, characterized in that: The second sidelink reference signal is a CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal is not used to transmit the CSI-RS.

31. The terminal device according to claim 30, characterized in that: The OFDM symbol occupied by the first sidelink reference signal includes a first OFDM symbol. If the OFDM symbol occupied by the first CSI-RS includes the first OFDM symbol, the first CSI-RS is not transmitted in the first time slot.

32. The terminal device according to claim 30 or 31, characterized in that: The receiving end device of the first sidelink reference signal does not expect to receive the CSI-RS in the OFDM symbol occupied by the first sidelink reference signal.

33. The terminal device according to claim 29, characterized in that: The second sidelink reference signal is a CSI-RS, and the OFDM symbol occupied by the first sidelink reference signal can be used to transmit the CSI-RS.

34. The terminal device according to claim 33, characterized in that: The first sideline reference signal and the first CSI-RS both occupy the second OFDM symbol, and the first sideline reference signal and the first CSI-RS occupy different REs.

35. The terminal device according to claim 34, characterized in that: The transmission power corresponding to the second OFDM symbol is the same as the transmission power corresponding to the third OFDM symbol, the third OFDM symbol carries a reference signal for sideline positioning, and the third OFDM symbol does not carry a CSI-RS.

36. The terminal device according to any one of claims 33 to 35, characterized in that: The receiving end device of the first sidelink reference signal does not expect the first sidelink reference signal to overlap with resources occupied by CSI-RS.

37. The terminal device according to any one of claims 30 to 36, characterized in that: The OFDM symbol occupied by the first sidelink reference signal is determined based on pre-configuration information or configuration information of a network device.

38. The terminal device according to any one of claims 30 to 36, characterized in that: The OFDM symbols occupied by the first sidelink reference signal are indicated by a transmitting device of the first sidelink reference signal through a first signaling, and the OFDM symbols occupied by the CSI-RS in the first time slot are indicated by a transmitting device of the first sidelink reference signal through a second signaling, and the OFDM symbols indicated by the first signaling do not overlap with the OFDM symbols indicated by the second signaling.

39. The terminal device according to claim 29, characterized in that: The second sidelink reference signal is a PT-RS associated with an antenna port of a PSSCH DMRS, and the OFDM symbol occupied by the first sidelink reference signal is not used to transmit the PT-RS.

40. The terminal device according to claim 39, characterized in that: If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is not transmitted in the first time slot.

41. The terminal device according to claim 40, characterized in that: The first sidelink reference signal and the PSSCH DMRS have the same antenna port, and the first sidelink reference signal is also used for phase tracking.

42. The terminal device according to claim 39, characterized in that: If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the first PT-RS is sent in the fourth OFDM symbol in the first time slot, and the fourth OFDM symbol is an OFDM symbol other than the OFDM symbol occupied by the first sidelink reference signal.

43. The terminal device according to claim 42, characterized in that: The fourth OFDM symbol is the first OFDM symbol after the OFDM symbol occupied by the first sidelink reference signal.

44. The terminal device according to claim 39, characterized in that: If the OFDM symbol occupied by the first PT-RS overlaps with the OFDM symbol occupied by the first sidelink reference signal, the PT-RS associated with the antenna port of the first sidelink reference signal is transmitted.

45. The terminal device according to claim 29, characterized in that: The second sidelink reference signal is a second PT-RS associated with an antenna port of a PSSCH DMRS. If an RE occupied by the second PT-RS overlaps with a target RE occupied by the first sidelink reference signal, the second PT-RS is transmitted on the target RE.

46. ​​The terminal device according to any one of claims 28 to 45, characterized in that: The first sidewalk reference signal is transmitted based on the first sidewalk reference signal and resources in a shared resource pool of sidewalk communication.

47. The terminal device according to claim 28, characterized in that: The first sidelink reference signal is transmitted based on resources in a dedicated resource pool for the first sidelink reference signal.

48. The terminal device according to claim 47, characterized in that: The dedicated resource pool is also used to transmit a third PT-RS.

49. The terminal device according to claim 48, characterized in that: The third PT-RS is associated with an antenna port of the first sidelink reference signal.

50. The terminal device according to claim 48 or 49, characterized in that: The RE position occupied by the third PT-RS in one PRB is determined based on configuration information or pre-configuration information of the network device.

51. The terminal device according to any one of claims 48 to 50, characterized in that: The RE position occupied by the third PT-RS is associated with the comb tooth size of the first sideline reference signal.

52. The terminal device according to any one of claims 48 to 51, characterized in that: The RE occupied by the third PT-RS is in the same RE position as at least one RE occupied by the first sidelink reference signal.

53. The terminal device according to any one of claims 48 to 52, characterized in that: The time domain interval of the third PT-RS is determined based on configuration information or pre-configuration information of the network device.

54. The terminal device according to any one of claims 48 to 53, characterized in that: The PRB interval of the third PT-RS is determined based on the number of PRBs included in the dedicated resource pool.

55. A terminal device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the annotation processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the terminal executes the method as described in any one of claims 1-27.

56. 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 27.

57. 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 27.

58. 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 27.

59. 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 27.

60. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 27.

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