Wireless communication method and terminal device

Abstract

A wireless communication method and a terminal device are provided. The method includes the terminal device transmitting or receiving a first PSSCH in a first slot, the first slot further used for transmitting a first reference signal, the first reference signal being used for sidelink positioning. In embodiments of the present disclosure, the terminal device may transmit a reference signal for sidelink positioning (i.e., a first reference signal) in a slot for transmitting and receiving other sidelink information. That is, the first reference signal resource and the other sidelink information resource share a resource pool, thereby enabling sidelink positioning.

Description

[Technical Field]

[0001] This disclosure relates to the telecommunications technology field, and more specifically to methods and terminal devices for wireless communication. [Background technology]

[0002] Certain communication systems, such as New Radio (NR) systems, are introducing sidelink-based positioning to enhance positioning technology. A challenge to address is how to determine the resources for reference signals used in sidelink positioning, such as the sidelink positioning reference signal (SL PRS). [Overview of the project]

[0003] This disclosure provides methods and terminal devices for wireless communication. Various aspects of this disclosure are described below.

[0004] In a first embodiment, a wireless communication method is provided, which includes a terminal device transmitting or receiving a first physical sidelink shared channel (PSSCH) in a first slot, the first slot further used for transmitting a first reference signal, the first reference signal used for sidelink positioning.

[0005] In a second embodiment, a terminal device is provided. The terminal device includes a transceiver module for transmitting or receiving a first PSSCH in a first slot, the first slot further used for transmitting a first reference signal, the first reference signal used for sidelink positioning.

[0006] In a third embodiment, a terminal device is provided, which includes a processor, memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor calls the computer programs in the memory to cause the communication device to perform some or all of the steps of the method in the first embodiment.

[0007] In a fourth embodiment, an embodiment of the present disclosure provides a communication system, which includes the terminal device described above. In another possible design, the system may further include other devices that interact with the terminal device in the manner provided in the embodiment of the present disclosure.

[0008] In a fifth embodiment, an embodiment of the present disclosure provides a computer-readable storage medium in which a computer program is stored. The computer program causes a terminal device to perform some or all of the steps of the methods in each of the above embodiments.

[0009] In a sixth embodiment, embodiments of the present disclosure provide a computer program product, which includes a non-temporary computer-readable storage medium containing the computer program, which is operable to cause a terminal device to perform some or all of the steps of the methods in each of the above embodiments. In some embodiments, the computer program product may be a software installation package.

[0010] In a seventh embodiment, an embodiment of the present disclosure provides a computer program which can be operated to cause a communication device to perform some or all of the steps of the methods in each of the above embodiments.

[0011] In the eighth embodiment, an embodiment of the present disclosure provides a chip comprising memory and a processor, the processor being able to implement some or all of the steps of the methods in each of the above embodiments by calling and executing a computer program from the memory.

[0012] In embodiments of this disclosure, the terminal device can transmit a reference signal for sidelink positioning (i.e., a first reference signal) in a slot for transmitting and receiving other sidelink information. That is, the first reference signal resource and the resources for other sidelink information share a resource pool, thereby enabling sidelink positioning. [Brief explanation of the drawing]

[0013] [Figure 1] This is an illustrative diagram of the system architecture of a wireless communication system to which the embodiments of this disclosure can be applied. [Figure 2] This is an illustrative diagram of a sidelink communication scenario within network coverage. [Figure 3] This is an illustrative diagram of a sidelink communication scenario with partial network coverage. [Figure 4] This is an illustrative diagram of a sidelink communication scenario outside of network coverage. [Figure 5] This is an illustrative diagram of a side-link communication scenario based on a central control node. [Figure 6] This is an illustrative diagram of a broadcast-based sidelink communication scheme. [Figure 7] This is an illustrative diagram of a unicast-based sidelink communication scheme. [Figure 8] This is an illustrative diagram of a multicast-based sidelink communication scheme. [Figure 9] This is an illustrative diagram of the slot structure of a sidelink communication system. [Figure 10] This is an illustrative diagram of the structure of the second stage SCI within the slot. [Figure 11] This is an illustrative diagram of the time-domain location of the Physical Sidelink Control Channel Demodulation Reference Signal (PSCCH DMRS) symbol within a slot. [Figure 12] This is an illustrative diagram of a single-symbol DMRS frequency domain type 1. [Figure 13]An exemplary diagram of resources for transmitting a downlink positioning reference signal (DL PRS). [Figure 14] A schematic structural diagram of an interleaved resource block (IRB). [Figure 15] An exemplary diagram of the frame structure of a SL-U system. [Figure 16] An exemplary diagram of a set of resource blocks (RBs). [Figure 17] A schematic flowchart of a wireless communication method according to an embodiment of the present disclosure. [Figure 18] A schematic structural diagram of a terminal device according to an embodiment of the present disclosure. [Figure 19] A schematic structural diagram of a communication device according to an embodiment of the present disclosure.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, in combination with the accompanying drawings, the technical solutions of the present disclosure will be described.

[0015] Communication system architecture FIG. 1 is an exemplary diagram of the system architecture of a wireless communication system 100 to which an embodiment of the present disclosure is applicable. The wireless communication system 100 can include a network device 110 and a terminal device 120. The network device 110 can be a device that communicates with the terminal device 120. The network device 110 provides communication coverage for a specific geographical area and can communicate with the terminal device 120 located within the coverage area.

[0016] Figure 1 illustrates one network device and one terminal device, but optionally the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For one network device 110, one or more terminal devices 120 may all be located within the network coverage area of ​​the network device 110, all be located outside the network coverage area of ​​the network device 110, or some may be located within the coverage area of ​​the network device 110 and others outside the network coverage area of ​​the network device 110, and the embodiments of this disclosure are not limited thereto.

[0017] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, and the embodiments of this disclosure are not limited thereto.

[0018] It should be understood that the technical solutions of the embodiments of this disclosure are applicable to a variety of communication systems, including 5th generation (5G) systems, new radio (NR) systems, long-term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, and LTE time division duplex (TDD) systems. The technical solutions provided in this disclosure are also applicable to future communication systems such as 6th generation mobile communication systems and satellite communication systems.

[0019] In embodiments of this disclosure, terminal devices may also be referred to as user equipment (UE), access terminals, user units, user stations, mobile stations (MS), mobile terminals (MT), remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication devices, user agents, or user equipment. In embodiments of this disclosure, terminal devices may refer to devices that provide voice and / or data connectivity to a user and can be used to connect people, things, or machines, such as handheld devices with wireless connectivity or in-vehicle devices. The terminal devices in the embodiments of this disclosure may include mobile phones, tablet PCs (Pads), notebook PCs, handheld computers, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. Optionally, the UE can function as a base station. For example, the UE can function as a scheduling entity that provides sidelink signals between UEs in V2X or D2D. For example, a mobile phone communicates with a car using sidelink signals. A mobile phone communicates with a smart home device without relaying communication signals via a base station.

[0020] In embodiments of this disclosure, a network device is a device used to communicate with terminal devices, and is also called an access network device or a radio access network device. For example, a network device may be a base station. In embodiments of this disclosure, a network device may refer to a radio access network (RAN) node (or device) that connects terminal devices to a radio network. A base station may generally encompass or be replaced by a variety of names. Examples include NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), secondary station (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, radio node, access point (AP), transmission node, transmit / receive node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), and positioning node. A base station can be a macro base station, micro base station, relay node, donor node, or something similar, or a combination thereof. A base station can also refer to a communication module, modem, or chip located within the aforementioned equipment or device.Base stations can also be mobile switching centers, devices that perform base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations can support networks with the same or different access technologies. The embodiments of this disclosure do not limit the specific technologies or device configurations employed by network devices.

[0021] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to function as a mobile base station, with one or more cells moving depending on the location of the mobile base station. In another example, a helicopter or drone can be configured to be used as a device for communicating with another base station.

[0022] In some deployments, the network device in the embodiments of this disclosure may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0023] Network devices and terminal devices can be deployed indoors or outdoors, on land (including portable or vehicle-mounted configurations), or on water. They can also be deployed in the air, such as on aircraft, balloons, or satellites. The deployment scenarios for network devices and terminal devices are not limited to those described in the embodiments of this disclosure.

[0024] It should be understood that all or part of the functions of the communication device in this disclosure may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0025] Sidelink communication under different network coverage conditions Sidelink communication refers to communication technology based on sidelinks. Sidelink communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. In conventional cellular systems, communication data is received or transmitted between terminal devices and network devices, but sidelink communication supports the direct transfer of communication data between terminal devices. Compared to conventional cellular communication, direct transfer of communication data between terminal devices can potentially achieve higher spectral efficiency and lower transmission latency. For example, in-vehicle internet systems employ sidelink communication technology.

[0026] In sidelink communication, depending on the network coverage situation in which the terminal device is located, sidelink communication can be classified into sidelink communication within network coverage, sidelink communication with partial network coverage, and sidelink communication outside of network coverage.

[0027] Figure 2 is an illustrative diagram of a sidelink communication scenario 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 disclosure may be replaced with configuration information) and determine the sidelink configuration based on the configuration signaling from network device 110. After the two terminal devices 120a have configured the sidelink, they can perform sidelink communication over the sidelink.

[0028] Figure 3 is an illustrative diagram of a sidelink communication scenario with partial network coverage. In the scenario shown in Figure 3, terminal device 120a communicates with terminal device 120b via sidelink. Since terminal device 120a is located within the coverage of network device 110, it can receive the configuration signaling of network device 110 and determine the sidelink configuration based on the network device 110's configuration signaling. Terminal device 120b is located outside the network coverage range 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 contained in the physical sidelink broadcast channel (PSBCH) transmitted by terminal device 120a, which is located within the network coverage range. After both terminal devices 120a and 120b have configured the sidelink, they can communicate via sidelink over the sidelink.

[0029] Figure 4 is an illustrative diagram of a sidelink communication scenario outside of network coverage. In the scenario shown in Figure 4, both terminal devices 120b are located outside the network coverage range. In this case, both terminal devices 120b can determine the sidelink configuration based on pre-configuration information. After the two terminal devices 120b have configured the sidelink, they can communicate over the sidelink.

[0030] Sidelink communication based on a central control node Figure 5 is an illustrative diagram of a sidelink communication scenario based on a central control node. In this sidelink communication scenario, multiple terminal devices form a single communication group, and a central control node exists within the communication group. This central control node may be one of the terminal devices within the communication group (e.g., terminal device 1 in Figure 5), and this terminal device is also called a cluster header (CH) terminal device. This central control node can be responsible for one or more of the following functions: establishing the communication group, allowing members to join and leave the communication group, coordinating resources within the communication group, allocating sidelink transmission resources to other terminal devices, receiving sidelink feedback information from other terminal devices, and coordinating resources with other communication groups.

[0031] Sidelink communication data transmission method Certain side-link communication systems (for example, long-term evolution vehicle to everything: LTE-V2X) support broadcast-based data transmission (hereinafter referred to as broadcast transmission). In broadcast transmission, the receiving terminal can be any terminal device in the vicinity of 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 can be any terminal device in the vicinity of terminal device 1, for example, any of terminal devices 2 through 6 in Figure 6.

[0032] In addition to broadcast transmission, some communication systems support unicast-based data transmission methods (hereinafter referred to as unicast transmission) and / or multicast-based data transmission methods (hereinafter referred to as multicast transmission). For example, the new radio vehicle to everything (NR-V2X) network aims to support autonomous driving. Autonomous driving places higher demands on data exchange between vehicles. For example, data exchange between vehicles requires higher throughput, lower latency, higher reliability, wider coverage, and more flexible resource allocation methods. Therefore, to improve data exchange performance between vehicles, NR-V2X introduces unicast and multicast transmission.

[0033] In unicast transmission, the receiving terminal typically has only one terminal device. Taking Figure 7 as an example, unicast transmission takes place between terminal device 1 and terminal device 2. Terminal device 1 can be the transmitting terminal and terminal device 2 can be the receiving terminal, or terminal device 1 can be the receiving terminal and terminal device 2 can be the transmitting terminal.

[0034] In multicast transmission, a receiving terminal can be any terminal device within a single communication group, or any terminal device within a certain transmission distance. Taking Figure 8 as an example, terminal devices 1, 2, 3, and 4 constitute a single communication group. When terminal device 1 transmits data, all other terminal devices within that group (from terminal device 2 to terminal device 4) can be receiving terminals.

[0035] Slot structure of NR-V2X Because the NR-V2X system has lower latency than the LTE-V2X system, the multiplexing scheme for the physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) in the NR-V2X system has been redesigned compared to the LTE-V2X system. Time-domain resource allocation in NR-V2X is done in slots (granularity). Within a single slot, the first orthogonal frequency division multiplexing (OFDM) symbol is fixedly used for automatic gain control (AGC). On the AGC symbol, the UE can duplicate the information transmitted by the second symbol. Finally, at the end of the slot, one symbol remains for transmit / receive switching, allowing the UE to switch from a transmit (or receive) state to a receive (or transmit) state.

[0036] In the NR-V2X system, the PSSCH and its associated PSCCH are transmitted within the same slot, and a PSCCH can occupy two or three OFDM symbols, excluding the AGC symbol. The time-domain position of the PSCCH starts from the second time-domain symbol available for sidelink transmission within that slot (the first time-domain symbol is the AGC symbol).

[0037] The number of PRBs occupied by a PSCCH in the frequency domain is configurable. For example, a PSCCH can occupy {10, 12, 15, 20, 25} physical resource blocks (PRBs) in the frequency domain. In the frequency domain, the number of PRBs occupied by a PSCCH is within the subband range of a single PSSCH. If the number of PRBs occupied by a PSCCH is smaller than the size of one subchannel of a PSSCH, or if the frequency domain resources of a PSSCH include multiple subchannels, then a PSCCH can be frequency-division multiplexed with another PSSCH on the OFDM symbol where it resides.

[0038] In the NR-V2X system, the parameters sl-startSLsymbols and sl-lengthSLsymbols can be used to set the start point and length of time-domain symbols (abbreviated as symbols) used for sidelink transmission within a single slot. The last symbol used for sidelink transmission within a single slot, as set by the parameters sl-startSLsymbols and sl-lengthSLsymbols, is used as a guard period (GP), and PSSCH and PSCCH can use only the remaining time-domain symbols.

[0039] In some embodiments, the NR-V2X may have a physical sidelink feedback channel (PSFCH) in addition to the PSCCH and PSSCH within a single sidelink slot. When a PSFCH transmission resource is configured in a single slot, the PSSCH and PSCCH cannot occupy the symbols used for PSFCH transmission, nor the AGC (Automatic Gain Control) and GP (Guard Period) symbols preceding those symbols.

[0040] Figure 9 shows an illustrative diagram of the slot structure of a specific sidelink communication system (e.g., an NR-V2X system). As shown in Figure 9, the network is configured with parameters sl-StartSymbol = 3 and sl-LengthSymbols = 11, meaning that 11 symbols starting with the symbol at index 3 in one slot are available for sidelink transmission. A PSFCH transmission resource resides in this slot, and the PSFCH occupies symbols 11 and 12. Symbol 11 functions as the AGC symbol for the PSFCH, and symbols 10 and 13 function as GPs, respectively. Therefore, the symbols available for PSCCH transmission are symbols 3 through 9. The PSCCH occupies three time-domain symbols; that is, the PSCCH occupies symbols 3, 4, and 5, with symbol 3 being typically used as the AGC symbol.

[0041] PSSCH can be used to carry second-stage sidelink control information (SCI) and sidelink shared channel (SL-SCH). Second-stage SCI can include different SCI formats. For example, 3GPP R16 defines two second-stage SCI formats, namely SCI format 2-A and SCI format 2-B. SCI format 2-B is suitable for multicast communication schemes with distance-based sidelink hybrid automatic repeat request (HARQ) feedback. SCI format 2-A is suitable for other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication schemes that require sidelink HARQ feedback, and multicast communication schemes that require acknowledgment (ACK) or negative acknowledgment (NACK) feedback. 3GPP R17 introduces an additional second-stage SCI format, namely SCI format 2-C, to specify reference resource sets and trigger signaling in specific situations.

[0042] Figure 10 shows an exemplary diagram of the structure of the second-stage SCI within a slot. As shown in Figure 10, the modulation symbols of the second-stage SCI begin mapping in frequency domain order, starting with the symbol where the first PSSCH demodulation reference signal is located, followed by the time domain order. These symbols are multiplexed by interleaving with resource elements (REs, or resource units) of the demodulation reference signal (DMRS). Furthermore, the modulation symbols of the second-stage SCI cannot be mapped to the RE where the phase tracking reference signal (PT-RS) is located.

[0043] In sidelink communication systems, different UEs may transmit PSCCHs on the same time-frequency resource, whether the UE autonomously selects resources or determines transmission resources based on network-based sidelink frequency scheduling. To ensure that the receiver can detect at least one PSCCH even in the event of a PSCCH resource collision, LTE-V2X employs a PSCCH DMRS randomization design. Specifically, when a UE transmits a PSCCH, it can randomly select one value from {0, 3, 6, 9} as the circulating shift of its DMRS. Even if multiple UEs transmit PSCCH DMRS on the same time-frequency resource and employ different circulating shifts, the receiving UE can detect at least one PSCCH through the orthogonal DMRS. For a similar purpose, NR-V2X introduces three PSCCH DMRS frequency-domain orthogonal covering codes (OCCs) that the transmitting UE can randomly select. As shown in Table 1, the i-th bit of the OCC mask is applied to the i-th DMRS RE within the resource block (RB), achieving the effect of identifying a different UE.

[0044] [Table 1]

[0045] The DMRS of the PSSCH in certain sidelink communication systems (e.g., NR-V2X systems) employs multiple time-domain PSSCH DMRS patterns, referencing the design of the NR Uu interface. Within a single resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. Table 2 shows the available DMRS patterns and the positions of each DMRS symbol within a given number of PSSCH symbols (including the first AGC symbol). Figure 11 shows a schematic diagram of the time-domain positions of four DMRS symbols within a single slot when the number of PSSCH symbols is 13.

[0046] [Table 2]

[0047] In some embodiments, when multiple time-domain DMRS patterns are configured within a resource pool, the specific time-domain DMRS pattern to be adopted can be selected by the transmitting UE and indicated in the first-stage SCI. This design allows fast-moving UEs to select high-density DMRS patterns to ensure accuracy in channel estimation, while slow-moving UEs can adopt low-density DMRS patterns to improve spectral efficiency.

[0048] The PSSCH DMRS sequence generation method is almost identical to the PSCCH DMRS sequence generation method, the only difference being the initialization formula c of the pseudorandom number sequence c(m). init In,

number

[0049] In NR communication systems, the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) support two frequency-domain DMRS patterns: DMRS frequency-domain type 1 and DMRS frequency-domain type 2. For each frequency-domain type, there are two different types: single-symbol DMRS symbol and dual-symbol DMRS symbol. Single-symbol DMRS frequency-domain type 1 supports four DMRS ports, while single-symbol DMRS frequency-domain type 2 can support six DMRS ports. In the case of dual-symbol DMRS symbols, the number of supported ports is doubled. However, in side-link communication systems (e.g., NR-V2X), the PSSCH only needs to support a maximum of two DMRS ports, and therefore can only support single-symbol DMRS frequency-domain type 1. Figure 12 is an illustrative diagram of single-symbol DMRS frequency-domain type 1.

[0050] Sidelink transmission block size (TBS) PSSCH follows the TBS determination mechanism of PDSCH and PUSCH in NR. That is, by determining the TBS based on a reference value of the number of REs available to PSSCH within the slot in which PSSCH is located, it is possible to bring the actual coding rate as close as possible to the target coding rate. The purpose of using a reference value of the number of REs rather than the actual number of REs is to ensure that the number of REs used to determine the TBS remains constant during the PSSCH retransmission process, and that the determined TBS is the same. To achieve this objective, the reference value N of the number of REs occupied by PSSCH in the TBS determination process is used. RE This is determined according to the following equation (0-1).

[0051]

number

number

number

number

[0052]

number

number

number

number

number

number

[0053] [Table 3]

[0054] Phase 2 SCI NR-V2X supports a second-stage SCI design. The first-stage SCI is used to carry information related to resource sensing, including time-domain and frequency-domain resources of the scheduled PSSCH, and simultaneously directs information such as the coding rate and format of the second-stage SCI. The second-stage SCI provides other information necessary for decoding the PSSCH.

[0055] The second-stage SCI has a 24-bit cyclic redundancy check (CRC) length, employs Polar coding, uses fixed QPSK modulation, and uses the same transmission port as the PSSCH data portion, allowing it to be demodulated using the PSSCH demodulation reference signal. However, unlike the PSSCH data portion transmission method, if the PSSCH employs a dual-stream transmission method, the modulation symbols of the second-stage SCI transmitted in the two streams are completely identical. This design ensures the reception performance of the second-stage SCI on highly correlated channels. The coding rate of the second-stage SCI can be dynamically adjusted within a certain range, and the specific coding rate adopted is determined by the coding rate corresponding to the indicated value in the "Second-stage SCI coding rate offset" field of the first-stage SCI and the MCS index indicated in the "MCS" field. Therefore, even after the coding rate is changed, the receiver does not need to perform blind detection on the second-stage SCI. However, after determining the coding rate of the second-stage SCI through the first-stage SCI, the receiving side needs to determine the number of REs occupied by the second-stage SCI in order to decode the second-stage SCI. Number of REs occupied by the second-stage SCI

number

number

[0056] Here, O SCI2 This represents the number of information bits in the second stage SCI and is determined by the format of the second stage SCI.

[0057] L SCI2 This represents the length of the CRC of the second stage SCI, and is 24 bits.

[0058]

number

number

number

[0059]

number

[0060] R is the coding rate corresponding to the MCS index indicated in the "MCS" field of SCI format 1-A, i.e., the coding rate adopted by the PSSCH data portion.

[0061]

number

number

number

[0062]

number

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[0063]

number

[0064]

number

[0065] The value of γ ranges from 0 to 11 and represents the number of remaining REs in the PRB where the last second-stage SCI modulation symbol is located. This parameter is used to ensure that the resources occupied by the second-stage SCI are an integer number of PRBs.

[0066] α is the maximum spectral efficiency of the second-stage SCI configured / pre-configured by the RRC parameter sl-Scaling.

[0067] In NR-V2X, a single PSSCH can be transmitted up to 32 times. Therefore, if a PSFCH resource exists in the resource pool and the configuration period of the PSFCH resource is 2 or 4, the number of OFDM symbols available in a slot where different transmissions of a single PSSCH are located may vary. Based on the actual number of OFDM symbols in a single slot,

number

number

number

number

number

[0068] As mentioned above, the modulation symbols of the second-stage SCI are mapped in frequency domain order, starting from the symbol where the first PSSCH demodulation reference signal is located, as shown in Figure 10, and then in time domain order. These symbols are then multiplexed with the DMRS RE by interleaving. Furthermore, the modulation symbols of the second-stage SCI cannot be mapped to the RE where the PT-RS is located.

[0069] Downlink-based positioning In downlink-based positioning, the parameter configuration of the downlink positioning reference signal (DL PRS) can include a four-layer configuration, from top to bottom: the positioning frequency layer, the TRP layer, the PRS resource set, and the PRS resource. The parameter configuration of the DL PRS is described in detail below. The network device can provide terminal devices with DL PRS configurations in four positioning frequency layers. The parameter structure for each positioning frequency layer provides DL PRS configuration parameters, including the DL PRS subcarrier spacing, the DL PRS cyclic prefix (CP) length, the DL PRS frequency domain resource bandwidth, the DL PRS frequency domain start frequency position of the DL PRS resource, the DL PRS frequency domain reference point "Point A", and the DL PRS comb size "Comb-N".

[0070] The frequency-domain resource bandwidth value of a DL PRS can be the number of PRBs allocated to the DL PRS. In some situations, the minimum frequency-domain resource bandwidth of a DL PRS can be 24 PRBs, with a granularity of 4 PRBs. The maximum frequency-domain resource bandwidth of a DL PRS can be 272 PRBs.

[0071] The frequency domain start frequency position of a DL PRS resource is used to indicate the index number of the starting PRB for DL ​​PRS frequency domain resource allocation. The PRB index number is defined relative to the DL PRS frequency domain reference point "Point A".

[0072] The above DL PRS configuration parameters corresponding to each positioning frequency layer apply to all DL PRS resources contained within that positioning frequency layer. This means that within a single positioning frequency layer, all DL PRS from multiple different TRPs use the same subcarrier spacing, the same CP length, the same comb size, are transmitted on the same frequency subband, and occupy the same bandwidth. This design allows terminal equipment to simultaneously receive and measure DL PRS from multiple different TRPs at the same frequency point.

[0073] In some scenarios, the parameters of the TRP layer may include ID parameters to uniquely identify the positioning TRP, such as the physical cell ID of the TRP, the NR cell global identifier (NCGI) of the TRP, or the absolute radio frequency channel number (ARFCN) of the TRP. Typically, up to two DL PRS resource sets can be configured within each TRP layer.

[0074] For each DL PRS resource set, the configuration parameters of the DL PRS resource set may apply to all DL PRS resources contained within that DL PRS resource set. The configuration parameters of a single DL PRS resource set include one or more of the following parameters: DL PRS resource set identifier (ID) (denoted as "nr-DL-PRS-ResourceSetID"), DL PRS transmission period and resource set slot offset (denoted as "dl-PRS-Periodicity-and-ResourceSetSlotOffset"), DL PRS resource repetition factor (denoted as "dl-PRS-ResourceRepetitionFactor"), DL PRS resource repetition time interval (denoted as "dl-PRS-ResourceTimeGap"), DL PRS muting configuration, and the number of OFDM symbols occupied by the DL PRS resource (denoted as "dl-PRS-NumSymbols").

[0075] The DL PRS transmission period and slot offset described above are used to instruct the transmission operation in the time domain of all DL PRS resources within the DL PRS resource set. In some embodiments, the minimum configurable DL PRS transmission period is 4 milliseconds, and the maximum configurable DL PRS transmission period is 10240 milliseconds. Currently, DL PRS configurations support flexible subcarrier intervals, including 15 kHz, 30 kHz, 60 kHz, and 120 kHz. For different subcarrier intervals, the range of values ​​for the configurable DL PRS transmission period may be the same. Figure 13 shows a schematic diagram of resources transmitting DL PRS with a comb size of 2 and RE offsets of 0 and 1, respectively.

[0076] The repetition coefficient of the DL PRS resource described above is used to indicate the number of times the DL PRS resource is repeatedly transmitted within each DL PRS transmission cycle. Currently, repeated transmission of the same DL PRS resource can be used by terminal equipment to aggregate the DL PRS energy from multiple transmissions. This helps increase the DL PRS coverage distance and improve positioning accuracy. In FR2 systems, repeated transmission of DL PRS resources can also be used by terminal equipment to perform a receive beam sweep operation. The terminal equipment can receive repeated transmissions of the same DL PRS resource using different receive beams to find the optimal matching between the TRP transmit beam and the terminal equipment receive beam. On the other hand, repeated transmission of DL PRS resources increases the DL PRS transmission overhead. Currently, to control transmission overhead, the 3GPP NR R16 specification specifies DL PRS resource repetition coefficient values ​​of 1, 2, 4, 6, 8, 16, and 32.

[0077] The above DL PRS resource repeat transmission time interval is used to indicate the number of slots between two consecutive repeat transmissions of the same DL PRS resource.

[0078] The above DL PRS mute configuration is used to instruct a transmitter not to transmit DL PRS on a specific allocated time-frequency resource. The mute configuration can be understood as meaning that DL PRS is not transmitted on all allocated time-frequency resources, but is intentionally not transmitted on certain designated time-frequency resources. On the one hand, the mute configuration can avoid collisions between DL PRS and other signals (e.g., SSB). On the other hand, the mute configuration can avoid interference between signals transmitted from different TRPs. For example, a mute configuration instructs a TRP close to a terminal device not to transmit DL PRS, while a TRP relatively farther away from the terminal device transmits DL PRS. This allows the terminal device to receive DL PRS from the more distant TRP without interference from the muted TRP.

[0079] The number of OFDM symbols occupied by the DL PRS resource mentioned above is used to indicate the number of OFDM symbols allocated to one DL PRS resource within a single slot.

[0080] Typically, the DL PRS configuration parameters included in the TRP layer parameters described above can be applied to all DL PRS resources within the DL PRS resource set corresponding to the TRP layer. Therefore, DL PRS resources belonging to the same DL PRS resource set will transmit DL PRS with the same transmission period and the same number of transmission repetitions, and the DL PRS will occupy the same number of OFDM symbols.

[0081] In some embodiments, for each DL PRS resource, the DL PRS configuration parameters may further include a DL PRS resource identifier (ID) (denoted as "nr-DL-PRS-ResourceID"), a DL PRS sequence ID (denoted as "dl-PRS-SequenceID"), a DL PRS start frequency domain resource element offset (denoted as "dl-PRS-CombSizeN-AndReOffset"), a DL PRS resource slot offset (denoted as "dl-PRS-ResourceSlotOffset"), a DL PRS OFDM symbol offset (denoted as "dl-PRS-ResourceSymbolOffset"), and DL PRS quasi-co-location (QCL) information (denoted as "dl-PRS-QCL-Info").

[0082] The above DL PRS starting frequency-domain resource element offset is used to indicate the frequency-domain resource element offset value used for resource mapping on the first assigned OFDM symbol of the DL PRS resource within a single slot. Typically, based on this parameter and the relative offset value defined in TS38.211, the terminal device can determine the frequency-domain resource element offset value used for resource mapping on each OFDM symbol.

[0083] The DL PRS resource slot offset described above is used to specify the slot offset for a DL PRS resource set. This parameter can determine the slot in which each DL PRS resource is located.

[0084] The OFDM symbol offset for DL ​​PRS described above is used to indicate the time-frequency resource allocation position of the DL PRS resource within a single slot. This parameter can be used to indicate the index number of the starting OFDM symbol within the slot.

[0085] The above DL PRS QCL information is used to indicate the DL PRS QCL information.

[0086] Sidelink transmission over unlicensed spectrum (SL-U) When performing sidelink transmission over an unlicensed spectrum, the sidelink transmission must meet certain regulatory requirements. These include requirements for minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For the OCB requirement, when a UE uses the channel to transmit data, the occupied channel bandwidth must not be less than 80% of the single channel bandwidth. For the maximum power spectral density requirement, the power transmitted by the UE per 1 MHz must not exceed 10 dBm. To meet the OCB and PSD regulatory requirements, sidelink transmission over an unlicensed spectrum must employ an interleaved resource block (IRB) structure. One IRB contains N discrete RBs in the frequency domain, with a total of M IRBs within the frequency band range, and the RBs in the m-th IRB are {m, M+m, 2M+m, 3M+m,...}.

[0087] Figure 14 shows a schematic diagram of an interleaved resource block (IRB). As shown in Figure 14, the system bandwidth contains 20 RBs, including 5 IRBs (i.e., M=5), and each IRB contains 4 RBs (i.e., N=4). The frequency domain spacing between two adjacent RBs belonging to the same IRB is the same, i.e., they are separated by 5 RBs. The numbers in the boxes in the figure represent the IRB index.

[0088] In an SL-U system, when adopting IRB-based resource allocation granularity, channels such as PSCCH and PSSCH in the SL-U system should be based on the IRB structure. Figure 15 shows an exemplary frame structure of an SL-U system. Here, the exemplary frame structure in Figure 15 is an exemplary frame structure that includes only PSCCH and PSSCH in the slot and does not include PSFCH. As shown in Figure 15, the bandwidth includes 20 RBs and consists of 5 IRB resources, i.e., M=5, each IRB resource contains 4 RBs, and the numbers in the boxes represent IRB indices. In Figure 15, the system is configured such that PSCCH occupies one IRB resource and occupies two OFDM symbols in the time domain. PSSCH has IRB granularity, the first symbol in the slot is the AGC symbol, and the last symbol is the GP symbol. In Figure 15, PSSCH 1 occupies IRB#0 and IRB#1, and the corresponding PSCCH 1 occupies IRB#0. PSSCH 2 occupies IRB#2, and its corresponding PSCCH 2 also occupies IRB#2. Note that, for simplification, Figure 15 does not show the resources occupied by the second-stage SCI, nor the resources occupied by PSCCH DMRS and PSSCH DMRS.

[0089] On the unlicensed spectrum, UEs can access channels via listen before talk (LBT). LBTs have a granularity of 20 MHz in the frequency domain, and each 20 MHz can be called an RB set. As shown in Figure 16, a single carrier can contain multiple RB sets, with guard periods (guard bands) between RB sets.

[0090] On unlicensed spectra, a UE must first perform a Limit Break Test (LBT), and can only access the channel after the LBT has passed, but the time it takes for the UE to complete the LBT is uncertain. In some embodiments, if the UE is restricted to transmitting from only one slot start point, the UE may miss a transmission opportunity because it has not yet completed the LBT. Therefore, in SL-U, adding transmission start points within a single slot, i.e., multi-start point transmission, is being considered. For example, an additional start point could be a third or fourth OFDM symbol within the slot.

[0091] Sidelink-based positioning In 3GPP R-17, the 3GPP RAN is researching sidelink-based positioning. Examples include "NR positioning enhancement" and "scenarios and requirements for in-coverage, partial-coverage, and out-of-coverage NR positioning use cases." The research on "scenarios and requirements for in-coverage, partial-coverage, and out-of-coverage NR positioning use cases" focuses on V2X and public safety use cases. Furthermore, some organizations (e.g., the 3GPP SA1 working group) are formulating requirements for "distance-based services," defining positioning accuracy requirements for IoT usage in out-of-coverage scenarios. 3GPP needs to research and develop sidelink-based positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0092] To improve positioning accuracy, particularly to enable positioning of UEs located outside the coverage of cellular networks, 3GPP completed feasibility and performance studies of sidelink positioning reference signal-based positioning technology in the initial stages of R18. Next, solutions based on sidelink positioning (including ranging / direction) in NR systems will be standardized. These sidelink positioning solutions will primarily involve standardization work on several aspects, including the following:

[0093] Standardization Task 1: Standardization of the sidelink positioning reference signal (SL PRS). The SL PRS uses a comb-based (full RE mapping mode is not excluded) frequency domain structure and can employ a sequence format based on pseudo-random number sequences. The SL PRS can use existing DL-PRS sequences as a design starting point and supports an SL PRS bandwidth of up to 100 MHz in FR1.

[0094] Standardization Task 2: Standardization of measurement quantities used for side-link positioning. For example, measurement quantities used to support SL RTT, SL-AOA, and SL-TDOA positioning schemes will be standardized.

[0095] Standardization Task 3: Standardization of SL PRS resource allocation methods. For example, SL PRS resource allocation methods include resource allocation method 1 and resource allocation method 2. Method 1 corresponds to the network allocating SL PRS resources, while method 2 corresponds to the UE autonomously selecting SL PRS resources. In some embodiments, the system supports a shared resource pool for SL PRS and Rel-16 / 17 / 18 sidelink communication, and a dedicated resource pool for SL PRS. In some embodiments, for method 2, one or more of the following should be considered and standardized: resource selection based on channel sensing, random resource selection, congestion control, and resource selection based on UE cooperation.

[0096] Standardization work 4: Standardization of open-loop power control mechanisms for SL PRS transmission.

[0097] In certain communication systems (e.g., NR systems), sidelink-based positioning is being introduced to enhance positioning technology. Determining the resources of the reference signal used for sidelink positioning, such as SL PRS, is a challenge that needs to be addressed.

[0098] To solve the above problems, embodiments of the present disclosure provide a method for wireless communication. In embodiments of the present disclosure, a terminal device can achieve sidelink positioning by transmitting a reference signal for sidelink positioning (i.e., a first reference signal) in a slot for sending and receiving other sidelink information.

[0099] This disclosure does not limit the application scenarios of the technical solutions. In some embodiments, the technical solutions of this disclosure may be applied to licensed spectrum scenarios. In some embodiments, the technical solutions of this disclosure may be applied to unlicensed spectrum scenarios.

[0100] The wireless communication method according to an embodiment of this disclosure will be described below in conjunction with Figure 17. Figure 17 is a schematic flowchart of the wireless communication method according to an embodiment of this disclosure. The method shown in Figure 17 can be performed by a terminal device. The embodiments of this disclosure do not specifically limit the terminal device. The terminal device may be any device related to sidelink positioning.

[0101] The method shown in Figure 17 may include step S1710.

[0102] In step S1710, the terminal device transmits or receives a first PSSCH in the first slot. The first slot is further used for transmitting a first reference signal, which is used for sidelink positioning.

[0103] In some embodiments, the first slot described above may contain resources within a shared resource pool between sidelink communications. The shared resource pool between sidelink communications may be understood to include resources for PSSCH and resources for transmitting other sidelink information (such as signals used for sidelink positioning). For example, the resource pool may include SL PRS resources and PSSCH resources, etc.

[0104] In some embodiments, the first PSSCH described above may be any of the physical sidelink sharing channels described above. For example, the first PSSCH may carry sidelink data and / or second-stage SCI.

[0105] In some embodiments, the first reference signal described above may be, for example, the SL PRS mentioned above. In another embodiment, the first reference signal described above may also be other sidelink positioning signals to be used in the communication system in the future.

[0106] In embodiments of this disclosure, the terminal device can transmit a reference signal for sidelink positioning (i.e., a first reference signal) in a slot for transmitting and receiving a first PSSCH. That is, the first reference signal shares a resource pool with the first PSSCH in order to realize sidelink positioning.

[0107] If the first reference signal shares a resource pool with sidelink communication, the first reference signal may be transmitted using different OFDM symbols within the same slot (i.e., the first slot) as the first PSSCH. The number of OFDM symbols available for transmitting the first PSSCH in the first slot is reduced compared to the case where the first reference signal is not transmitted in the first slot, or where there are no resources in the first slot to transmit the first reference signal.

[0108] To solve the problem of how to determine the TBS in the first slot in the above case, the TBS of the first PSSCH can be determined based on a first parameter, which is associated with a first reference signal. In some embodiments, the first parameter is associated with the number of OFDM symbols occupied by the first reference signal. In other embodiments, the first parameter is associated with a reference value for the number of OFDM symbols, which is associated with the first reference signal.

[0109] The following describes the two methods (i.e., Example 1 and Example 2) described above for determining the TBS of the first PSSCH based on the first parameter.

[0110] Example 1 As mentioned above, the first parameter can be associated with the number of OFDM symbols occupied by the first reference signal. For example, the first parameter may be the number of OFDM symbols occupied by the first reference signal. Alternatively, the first parameter can be determined based on the number of OFDM symbols occupied by the first reference signal.

[0111] In some embodiments, the first parameter can be indicated based on first information; that is, the first information can indicate the first parameter. The first information can be carried in a second-stage SCI associated with a first PSSCH. In some communication systems, SCI format 2-D is introduced to support side-link positioning, so the format of the second-stage SCI referred to herein may be, for example, SCI format 2-D.

[0112] The first piece of information can directly or indirectly indicate the first parameter. For example, the first piece of information may contain the first parameter. As another example, the first piece of information may indicate the first parameter by a configuration index or identifier.

[0113] To ensure flexibility in TB transmission, the N transmissions of the same TB are not necessarily always transmitted within the same slot as the first reference signal. For example, only M transmissions transmit the TB and the first reference signal within the same slot, while in the other NM transmissions, the TB is transmitted alone (i.e., not with the first reference signal). In this case, M ≤ N.

[0114] In other words, in the process of multiple transmissions of the same TB (including the initial transmission and retransmission), in some slots the TB is not transmitted with the first reference signal, while in other slots the TB is transmitted with the first reference signal. In such cases, if the size of the PSSCH's TBS is determined based on the number of OFDM symbols actually occupied by the first reference signal, the size of the TB determined in different transmission processes may differ.

[0115] Therefore, in order to aggregate energy for TB over multiple transmissions, the TBS of the second PSSCH may be the same as the TBS of the first PSSCH. The TB transmitted in the second PSSCH is identical to the TB transmitted in the first PSSCH. The second PSSCH referred to here does not transmit a reference signal for sidelink positioning. In other words, the second PSSCH may be the PSSCH mentioned above, in which the TB is transmitted independently and not together with the first reference signal.

[0116] In some embodiments, the SCI format of the second-stage SCI associated with the second PSSCH may be SCI format 2-D. For example, the information carried by the second-stage SCI associated with the second PSSCH (e.g., third information) can indicate the number of OFDM symbols occupied by the first reference signal in the second PSSCH, and the third information indicates that the number of OFDM symbols occupied by the first reference signal in the second PSSCH is 0.

[0117] However, in such a case, if the second stage SCI indicates that the number of OFDM symbols occupied by the first reference signal is 0, the PSSCH associated with that second stage SCI may be the second PSSCH mentioned above, or it may be another PSSCH other than the second PSSCH mentioned above.

[0118] Therefore, in some embodiments, a second-stage SCI associated with a PSSCH may include second information that can be used to indicate whether the PSSCH is the second PSSCH described above. In other words, the TBS of the PSSCH can be determined based on the second information. For example, if the second value is the first value, the PSSCH is the second PSSCH described above. That is, the TBS of the PSSCH is the same as the TBS of the first PSSCH. Alternatively, if the second information is the second value, the PSSCH is not the second PSSCH described above, and the TBS of the PSSCH may be determined based on a reference value of the number of REs occupied by the PSSCH. That is, the TBS of the PSSCH may be determined based on the aforementioned formula (0-1).

[0119] Alternatively, the second stage SCI associated with the second PSSCH may contain second information that can be used to determine the TBS of the second PSSCH. For example, if the second information is a first value, the second information indicates that the TBS of the second PSSCH is identical to the TBS of the first PSSCH. And / or, if the second information is a second value, the second information indicates that the TBS of the second PSSCH is determined based on a reference value of the number of REs occupied by the second PSSCH. In other words, the TBS of the second PSSCH may be determined based on the above equation (0-1).

[0120] As an example, the second piece of information may be a specific bit field of the second stage SCI, for example, one bit. If the value of the bit field is a specific value (i.e., a first value, for example, 1), it indicates that the PSSCH associated with the second stage SCI is the second PSSCH, and that the TBS of the PSSCH is the same as that of the first PSSCH. If the bit field is a non-specific value (i.e., a second value), then the PSSCH associated with the second stage SCI is not the second PSSCH, and the PSSCH is determined based on a reference value of the number of REs occupied by the PSSCH. That is, it is determined based on the formula (0-1) described above. The size of the bit field and the specific value mentioned herein are illustrative only, and the disclosure is not limited thereto, for example, the specific value mentioned herein may be 0.

[0121] In another embodiment, the SCI format of a second-stage SCI associated with a PSSCH that does not transmit a reference signal for side-link positioning may be SCI format 2-A, SCI format 2-B, and SCI format 2-C. Similarly, the PSSCH associated with the second-stage SCI may be the second PSSCH described above, or it may be another PSSCH other than the second PSSCH described above.

[0122] Therefore, in some embodiments, if another terminal device receives PSSCHs associated with multiple second-stage SCIs to transmit the same TB, and at least one of the multiple second-stage SCIs has a format of SCI format 2-D, then the TBSs of the PSSCHs associated with the multiple second-stage SCIs are identical. For example, if another terminal device receives a second-stage SCI associated with a first PSSCH and a second-stage SCI associated with a second PSSCH, and at least one of the two second-stage SCIs has a format of SCI format 2-D, then the TBS of the first PSSCH is identical to the TBS of the second PSSCH. The other terminal device referred to herein is a terminal device that performs side-link communication with the terminal device in the embodiments of this disclosure.

[0123] There are several ways to determine whether multiple PSSCHs are used to transmit the same TB. That is, PSSCHs transmitting the same TB can satisfy one or more conditions. For example, the first and second PSSCHs mentioned above can satisfy one or more of the following conditions: the source identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the source identifier indicated by the second-stage SCI associated with the first PSSCH; the destination identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the destination identifier indicated by the second-stage SCI associated with the first PSSCH; the HARQ process number indicated by the second-stage SCI associated with the second PSSCH is the same as the HARQ process number indicated by the second-stage SCI associated with the first PSSCH; and the value of the new data indicator (NDI) indicated by the second-stage SCI associated with the second PSSCH is the same as the value of the NDI indicated by the second-stage SCI associated with the first PSSCH.

[0124] In some embodiments, the first PSSCH may be a PSSCH related to the initial transmission process of one of the aforementioned TBs. In other embodiments, the first PSSCH may be the previous PSSCH received by another terminal device compared to the second PSSCH, or the first PSSCH may be the most recently received PSSCH by another terminal device compared to the second PSSCH. Thus, even if the PSSCH related to the initial transmission process is lost or cannot be obtained, the TBS of the second PSSCH can be determined based on the most recently received PSSCH.

[0125] In the embodiments of this disclosure, the TBS of the first PSSCH is determined based on a first parameter related to the number of OFDM symbols actually occupied by the first reference signal. This is useful for precisely adjusting the TBS according to the available resources, thereby contributing to improved spectral efficiency.

[0126] Example 2 As mentioned above, the first parameter can be associated with a reference value for the number of OFDM symbols. The reference value for the number of OFDM symbols referred to here is associated with the first reference signal. For example, the first parameter may be a reference value for the number of OFDM symbols used for the first reference signal. Alternatively, the first parameter may be determined based on one or more resources used to transmit the first reference signal within the slot. For example, the first parameter may be determined based on the number of OFDM symbols occupied by one or more resources used to transmit the first reference signal within the slot. Here, the number of OFDM symbols used for the first reference signal may be the number of OFDM symbols occupied by one or more resources used to transmit the first reference signal within the slot.

[0127] In some embodiments, the second stage SCI associated with the first PSSCH may include a first indicator field used to indicate the first parameter described above.

[0128] In some embodiments, the number of bits occupied by the first indicator field is associated with the number of OFDM symbols used for the first reference signal. For example, the number of bits occupied by the first indicator field may be determined based on the number of possible values ​​for the number of OFDM symbols used for the first reference signal.

[0129] For example, the number of OFDM symbols used in the first reference signal has A possible values ​​(i.e., the number of possible values ​​is A). The number of bits occupied by the first indicator field is

number

[0130] The correspondence between the A+1 values ​​in the first instruction field and the multiple values ​​of the first parameter may be determined according to the usage requirements. The correspondence between the A+1 values ​​in the first instruction field and the multiple values ​​of the first parameter may be pre-configured or dynamically specified, and is not limited to this disclosure.

[0131] In some embodiments, the first indicator field may occupy one bit, which may be used to indicate that the first parameter is 0 or X, where X is a positive integer greater than or equal to 1, and X is associated with the number of OFDM symbols used for the first reference signal.

[0132] For example, X could be the maximum of several values ​​for the number of OFDM symbols used for the first reference signal, which helps avoid resource collisions between the TB and the first reference signal.

[0133] Furthermore, X may be determined based on the average of multiple values ​​for the number of OFDM symbols used in the first reference signal. If the average of multiple values ​​for the number of OFDM symbols used in the first reference signal is an integer, X can be the average of multiple values ​​for the number of OFDM symbols used in the first reference signal. Otherwise, X can be the value closest to the average among the multiple values ​​for the number of OFDM symbols used in the first reference signal, or the integer part of that average, or the average rounded to the nearest integer. For example, if the values ​​for the number of OFDM symbols used in the first reference signal include 1, 3, and 5, i.e., the average of multiple values ​​for the number of OFDM symbols used in the first reference signal is 3, then X could be 3. If the number of OFDM symbols used for the first reference signal includes 1, 2, and 5, i.e., the average number of the number of OFDM symbols used for the first reference signal is 2.67, then X can be 2 (i.e., the integer part of 2.67, or the value of 1, 2, and 5 that is closest to 2.67), or X can be 3 (i.e., the rounded value of 2.67).

[0134] To simplify the method for determining X, as an alternative example, X can be the median of multiple values ​​for the number of OFDM symbols used in the first reference signal. For example, if multiple values ​​for the number of OFDM symbols used in the first reference signal include 1, 2, and 4, i.e., if the median of multiple values ​​for the number of OFDM symbols used in the first reference signal is 2, then X could be 2.

[0135] A method for determining the first parameter based on the average or median of multiple values ​​for the number of OFDM symbols used in the first reference signal helps both to avoid resource collisions between the TB and the first reference signal and to improve spectral efficiency.

[0136] As another example, X could be the most frequently used value among several values ​​for the number of OFDM symbols used in the first reference signal. The most frequently used value mentioned here can be associated with, for example, a side-link positioning usage scenario. For example, in the first scenario, if the most frequently used value among several values ​​for the number of OFDM symbols used in the first reference signal is Y, then the value of X in that scenario could be Y. In this way, it helps to reduce the probability of resource collisions.

[0137] Table 4 shows the correspondence between X and several values ​​for the number of OFDM symbols used in the first reference signal.

[0138] [Table 4]

[0139] In some embodiments, the rules for determining X described above may be pre-configured or dynamically specified. In another embodiment, the correspondence between X and multiple values ​​of the number of OFDM symbols used for the first reference signal may also be pre-configured or dynamically specified. For example, the contents of Table 4 may be dynamically specified.

[0140] In some embodiments, the first parameter can be communicated from the transmitter of the first PSSCH to the receiver of the first PSSCH via upper-layer signaling. This helps to conserve the processing resources of the receiver. The upper-layer signaling referred to here may include, for example, sidelink positioning protocol (SLPP) signaling or RRC signaling.

[0141] To simplify the determination of the first parameter, in some embodiments, the first parameter may be determined based on the value of the number of OFDM symbols used in the first reference signal. For example, if there is only one value for the number of OFDM symbols used in the first reference signal, the first parameter may be the value of the number of OFDM symbols used in the first reference signal. Alternatively, if there are multiple values ​​for the number of OFDM symbols used in the first reference signal, the first parameter may be determined based on the multiple values ​​of the number of OFDM symbols used in the first reference signal.

[0142] The method for determining the first parameter based on multiple values ​​of the number of OFDM symbols used in the first reference signal may be one or more of the multiple methods for determining X based on multiple values ​​of the number of OFDM symbols used in the first reference signal described above, and will not be described here for the sake of brevity. Table 5 shows the correspondence between multiple values ​​of the number of OFDM symbols used in the first reference signal and the first parameter.

[0143] [Table 5]

[0144] In some embodiments, the method for determining the first parameter based on multiple values ​​of the number of OFDM symbols used in the first reference signal may differ from the aforementioned method for determining X based on multiple values ​​of the number of OFDM symbols used in the first reference signal.

[0145] In some embodiments, the TBS of the first PSSCH is determined based on a second parameter, which may be determined based on the first parameter. The second parameter represents a reference value for the number of REs available for the PSSCH within a single PRB.

[0146] In some embodiments, the second parameter is further determined based on one or more of the following: a third parameter representing the number of subcarriers in one PRB; a fourth parameter representing the number of OFDM symbols available for sidelink transmission in one slot; a fifth parameter representing a reference value for the number of OFDM symbols occupied by the PSFCH; a sixth parameter representing a reference value for the number of REs occupied by the PT-RS and / or CSI-RS; and a seventh parameter representing the average number of DMRS REs in one slot.

[0147] For example, the second parameter can satisfy the following equation:

[0148]

number

number

number

number

number

number

number

number

[0149] It should be noted that one or more resources used to transmit the first reference signal within a slot may be configured / pre-configured within a resource pool, or may be determined by the transmitter and receiver through higher-layer signaling (e.g., SLPP layer signaling or RRC layer signaling).

[0150] In the embodiments of this disclosure, determining the TBS of the first PSSCH based on a reference value for the number of OFDM symbols eliminates the need for the transmitter of the first PSSCH to dynamically indicate the OFDM symbols occupied by the first reference signal, thereby helping to simplify the signaling design.

[0151] As mentioned above, in order to decode the second-stage SCI, it is necessary to obtain the number of REs occupied by the second-stage SCI. Also, as mentioned above, the first reference signal may be transmitted with a different OFDM symbol within the same slot as the first PSSCH (i.e., the first slot). The number of OFDM symbols available for the first PSSCH transmission in the first slot is reduced compared to when the first reference signal is not transmitted in the first slot, or when there are no resources in the first slot to transmit the first reference signal.

[0152] Under these circumstances, in order to solve the problem of how to determine the number of REs occupied by the second-stage SCI associated with the first PSSCH, the methods provided by the embodiments of this disclosure will be described below in combination with Examples 3 to 5.

[0153] Example 3 In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH may be determined based on the number of OFDM symbols occupied by the first reference signal. Here, the SCI format of the second-stage SCI associated with the first PSSCH may be, for example, SCI format 2-D. For example, the number of REs occupied by the second-stage SCI associated with the first PSSCH may be determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot.

[0154] If the number of OFDM symbols contained in one or more resources used for the first reference signal within a slot has only one value, the number of REs occupied by the second-stage SCI associated with the first PSSCH can be determined based on that value. If the number of OFDM symbols contained in one or more resources used for the first reference signal within a slot has multiple different values, the number of REs occupied by the second-stage SCI associated with the first PSSCH can be determined based on the multiple different values ​​mentioned above. For example, the number of REs occupied by the second-stage SCI associated with the first PSSCH can be determined based on the largest number of OFDM symbols contained in the resource used for the first reference signal within the slot (i.e., the maximum value among the multiple different values ​​mentioned above), which helps to avoid resource collisions. As another example, the number of REs occupied by the second-stage SCI associated with the first PSSCH can be determined based on the average or median of the multiple values ​​of the number of OFDM symbols contained in the resource used for the first reference signal within the slot. As an example, the determination method based on the average or median of the above multiple values ​​may be one or more of the aforementioned methods for determining the first parameter based on multiple values ​​of the number of OFDM symbols occupied by one or more resources used to transmit the first reference signal. Furthermore, if the number of OFDM symbols contained in the resources used for the first reference signal within a slot includes multiple values, the number of REs occupied by the second-stage SCI associated with the first PSSCH may be determined based on one of the above multiple values, pre-set, pre-defined, or indicated. For example, it may be determined based on the value of the first parameter in Table 5.

[0155] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on an eighth parameter, which is determined based on one or more of the following: a value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within a slot; a ninth parameter representing the number of OFDM symbols available for sidelink transmission within a single slot; and a tenth parameter representing the number of OFDM symbols occupied by the PSFCH.

[0156] For example, the eighth parameter satisfies the following equation.

[0157]

number

number

number

number

number

[0158] Note that the resources used for the first reference signal within a slot may be configured / pre-configured within the resource pool.

[0159] In embodiments of the present disclosure, resource contention between OFDM symbols occupied by the second-stage SCI and OFDM symbols occupied by the first reference signal is avoided by determining the number of REs occupied by the second-stage SCI associated with the first PSSCH based on the resources used to transmit the first reference signal configured / pre-configured in the resource pool.

[0160] Example 4 In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH may not be determined based on the first scaling factor, which is a parameter set by upper-layer signaling, such as a parameter set or pre-set by the RRC parameter sl-Scaling to determine the number of REs occupied by the second-stage SCI. For example, the first scaling factor may be the maximum spectral efficiency α in equation (0-3).

[0161] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on one or more of the following: the 11th parameter representing the number of bits included in the second-stage SCI, the 12th parameter representing the length of the CRC of the second-stage SCI, the 13th parameter representing the coding rate offset of the second-stage SCI, the 14th parameter representing the modulation stage of the second-stage SCI, the 15th parameter representing the coding rate corresponding to the PSSCH, and the 16th parameter representing the number of remaining REs in the first PRB, where the first PRB is the PRB where the last modulation symbol of the second-stage SCI is located. As an example, the number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the following equation:

[0162]

number

number

number

number

[0163] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies a first condition, which is associated with a first scaling factor. For example, the first condition is:

number

number

[0164] Here,

number

[0165]

number

number

number

number

number

[0166] In embodiments of this disclosure, by not determining the number of REs occupied by the second-stage SCI based on a first scaling factor, it is possible to avoid an impact on the number of REs occupied by the second-stage SCI when the first PSSCH and the first reference signal are transmitted in the same slot. For example, if the first condition is met, the determination of the number of REs occupied by the second-stage SCI associated with the first PSSCH becomes independent of whether the first PSSCH is transmitted in the same slot as the first reference signal, thereby avoiding an impact on the number of REs occupied by the second-stage SCI when the first PSSCH and the first reference signal are transmitted in the same slot.

[0167] Furthermore, the embodiments of this disclosure do not determine the number of REs occupied by the second-stage SCI based on a first scaling factor. That is, the receiving device can determine the number of REs occupied by the second-stage SCI to be received without having to determine the format of the second-stage SCI to be received. Therefore, in some cases, it is not necessary to add information to the first-stage SCI indicating the second-stage SCI format 2-D, which helps to save resources.

[0168] Example 5 In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH can be determined based on a second scaling factor, which is associated with SCI format 2-D.

[0169] Since the second stage SCI 2-D (i.e., the second stage SCI, which is the format of SCI format 2-D) is usually transmitted with the first reference signal, the transmission of the first reference signal affects the number of REs occupied by the second stage SCI 2-D. Based on this, the second scaling factor can be a scaling factor used to determine the number of REs occupied by the second stage SCI 2-D, or it can be a scaling factor not used to determine the number of REs occupied by the second stage SCI of other formats. For example, the second scaling factor differs from the first scaling factor, which is used to determine the number of REs occupied by the second stage SCI, and the first scaling factor is associated with SCI format 2-A, SCI format 2-B, or SCI format 2-C. In other words, the first scaling factor is a scaling factor used to determine the number of REs occupied by the second stage SCI 2-A, 2-B, or 2-C.

[0170] The transmission of the second-stage SCI 2-D with the first reference signal has an effect on the number of REs occupied by the second-stage SCI 2-D, which may include a reduction in the number of OFDM symbols available to the second-stage SCI 2-D, or a decrease in the number of REs that the second-stage SCI 2-D can occupy. Therefore, in some embodiments, the second scaling factor can be smaller than the first scaling factor, thereby helping to reduce the number of REs occupied by the second-stage SCI 2-D.

[0171] In some embodiments, the second scaling factor may be set or preset, for example, by an RRC parameter.

[0172] In an embodiment of the present disclosure, the method for determining the number of REs occupied by the second-stage SCI according to the second scaling factor is easy to implement.

[0173] It should be noted that the values and / or meanings of the third parameter, the fourth parameter, the fifth parameter, the sixth parameter, the seventh parameter, the ninth parameter, the tenth parameter, the eleventh parameter, the twelfth parameter, the thirteenth parameter, the fourteenth parameter, the fifteenth parameter, and the sixteenth parameter may be the same as the values and / or meanings of the corresponding parameters described in the foregoing formulas (0-1), (0-2), and (0-3).

[0174] It should be noted that each embodiment mentioned in the present disclosure can be used alone or in combination, and the embodiments of the present disclosure are not limited thereto. For example, the above method for determining the TBS of the first PSSCH may be used alone or in combination with the method for determining the number of REs occupied by the second-stage SCI.

[0175] As described above, the embodiments of the method of the present disclosure have been described in detail with reference to FIGS. 1 to 17. Next, the embodiments of the apparatus of the present disclosure will be described in detail with reference to FIGS. 18 and 19. Since the description of the method embodiments and the description of the apparatus embodiments correspond to each other, it should be understood that for parts not described in detail, reference can be made to the foregoing method embodiments.

[0176] FIG. 18 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure. The terminal device 1800 shown in FIG. 18 may include a transceiver module 1810.

[0177] The transceiver module 1810 is used to transmit or receive the first PSSCH in the first slot, and the first slot is further used for transmitting the first reference signal, and the first reference signal is used for sidelink positioning.

[0178] In some embodiments, the TBS of the first PSSCH is determined based on a first parameter, and the first parameter is associated with a first reference signal.

[0179] In some embodiments, the first parameter being associated with the first reference signal includes that the first parameter is the number of OFDM symbols occupied by the first reference signal, or the first parameter is determined based on the number of OFDM symbols occupied by the first reference signal.

[0180] In some embodiments, the first parameter is indicated based on first information, and the first information is carried in a second-stage SCI associated with the first PSSCH.

[0181] In some embodiments, the format of the second-stage SCI is SCI format 2-D.

[0182] In some embodiments, the TBS of the second PSSCH is the same as the TBS of the first PSSCH, and the second PSSCH and the first PSSCH transmit the same TB.

[0183] In some embodiments, the second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-D.

[0184] In some embodiments, the second-stage SCI associated with the second PSSCH includes second information, and the second information is used to determine the TBS of the second PSSCH.

[0185] In some embodiments, when the second information is a first value, the second information indicates that the TBS of the second PSSCH is the same as the TBS of the first PSSCH, and / or when the second information is a second value, the second information indicates that the TBS of the second PSSCH is determined based on a reference value of the number of REs occupied by the second PSSCH.

[0186] In some embodiments, the second stage SCI associated with the second PSSCH includes third information, which is used to indicate the number of OFDM symbols occupied by the reference signal for sidelink positioning, and the number of OFDM symbols indicated by the third information is 0.

[0187] In some embodiments, the second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-A, SCI format 2-B, or SCI format 2-C.

[0188] In some embodiments, the second PSSCH and the first PSSCH satisfy one or more of the following: namely, the source identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the source identifier indicated by the second-stage SCI associated with the first PSSCH; the destination identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the destination identifier indicated by the second-stage SCI associated with the first PSSCH; the HARQ process number indicated by the second-stage SCI associated with the second PSSCH is the same as the HARQ process number indicated by the second-stage SCI associated with the first PSSCH; and the NDI value indicated by the second-stage SCI associated with the second PSSCH is the same as the NDI value indicated by the second-stage SCI associated with the first PSSCH.

[0189] In some embodiments, the association of the first parameter with a first reference signal includes the first parameter being a reference value for the number of OFDM symbols used in the first reference signal, or the first parameter being determined based on one or more resources used to transmit the first reference signal within a slot.

[0190] In some embodiments, the second stage SCI associated with the first PSSCH includes a first indicator field, which is used to indicate a first parameter.

[0191] In some embodiments, the number of bits occupied by the first indicator field is associated with the number of OFDM symbols used for the first reference signal.

[0192] In some embodiments, the number of OFDM symbols used for the first reference signal can take on A values, and the number of bits occupied by the first indicator field is

number

[0193] In some embodiments, the first indicator field occupies one bit, which is used to indicate that the first parameter is 0 or X, where X is a positive integer greater than or equal to 1, and X is associated with the number of OFDM symbols used for the first reference signal.

[0194] In some embodiments, the first parameter is instructed by upper-layer signaling from the transmitter of the first PSSCH to the receiver of the first PSSCH.

[0195] In some embodiments, the upper layer signaling includes SLPP signaling or RRC signaling.

[0196] In some embodiments, the TBS of the first PSSCH is determined based on a second parameter, the second parameter is determined based on the first parameter, and the second parameter represents a reference value for the number of REs available for the PSSCH within a single PRB.

[0197] In some embodiments, the second parameter is further a third parameter representing the number of subcarriers within one PRB, a fourth parameter representing the number of OFDM symbols available for sidelink transmission within one slot, a fifth parameter representing a reference value of the number of OFDM symbols occupied by a physical sidelink feedback channel (PSFCH), a sixth parameter representing a reference value of the number of REs occupied by a phase tracking reference signal (PT-RS) and / or a channel state information reference signal (CSI-RS), and a seventh parameter representing the average number of demodulation reference signal resource elements (DMRS REs) within one slot, and is determined based on one or more of them.

[0198] In some embodiments, the second parameter satisfies the following equation.

[0199] [Number] Here, [Number] represents the first parameter, [Number] represents the second parameter, [Number] represents the third parameter, [Number] represents the fourth parameter, [Number] represents the fifth parameter, [Number] represents the sixth parameter,

number

[0200] In some embodiments, the number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot.

[0201] In some embodiments, the number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the maximum number of OFDM symbols contained in the resource used for the first reference signal within the slot.

[0202] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on an eighth parameter, which is determined based on one or more of the following: a value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within a slot; a ninth parameter representing the number of OFDM symbols available for sidelink transmission within a single slot; and a tenth parameter representing the number of OFDM symbols occupied by the PSFCH.

[0203] In some embodiments, the eighth parameter satisfies the following equation.

[0204]

number

number

number

number

[0205] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is not determined based on the first scaling factor, and the first scaling factor is a parameter set by upper-layer signaling to determine the number of REs occupied by the second-stage SCI.

[0206] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is the 11th parameter representing the number of bits included in the second-stage SCI, the 12th parameter representing the length of the cyclic redundancy check (CRC) of the second-stage SCI, the 13th parameter representing the coding rate offset of the second-stage SCI, the 14th parameter representing the modulation stage of the second-stage SCI, the 15th parameter representing the coding rate corresponding to the PSSCH, and the 16th parameter representing the number of remaining REs of the first PRB, where the first PRB is the PRB where the last modulation symbol of the second-stage SCI is located, and is determined based on one or more of them.

[0207] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the following formula.

[0208] [Number] Here, [Number] represents the number of REs occupied by the second-stage SCI associated with the first PSSCH, O SCI2represents the 11th parameter, L SCI2 This represents the 12th parameter,

number

number

[0209] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the first condition, and the first condition is associated with the first scaling factor.

[0210] In some embodiments, the first condition is:

number

number

number

number

number

number

number

number

[0211] In some embodiments, the number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on a second scaling factor, which is associated with SCI format 2-D.

[0212] In some embodiments, the second scaling factor differs from the first scaling factor, the first scaling factor is used to determine the number of REs occupied by the second-stage SCI, and the first scaling factor is associated with SCI format 2-A, SCI format 2-B, or SCI format 2-C.

[0213] In some embodiments, the second scaling factor is smaller than the first scaling factor.

[0214] In some embodiments, the SCI format of the second-stage SCI associated with the first PSSCH is SCI format 2-D.

[0215] In some embodiments, the transceiver module 1810 may be a processor 1910. The terminal device 1800 may further include a transceiver 1930 and a memory 1920, as specifically shown in Figure 19.

[0216] Figure 19 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. The dashed lines in Figure 19 indicate that the unit or module is optional. Device 1900 may be used to implement an embodiment of the method described above. Device 1900 may be a chip or a terminal device.

[0217] The apparatus 1900 may include one or more processors 1910. The processors 1910 can support the apparatus 1900 in implementing the methods described in the embodiments of the above-mentioned methods. The processors 1910 can be general-purpose processors. The processors 1910 can be general-purpose processors or dedicated processors. 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, an discrete gate or transistor logic device, a discrete hardware component, etc. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0218] The device 1900 may also include one or more memories 1920. A program is stored in the memory 1920, which is executed by the processor 1910, causing the processor 1910 to perform the method described in the embodiment of the above method. The memory 1920 may be provided independently of the processor 1910, or it may be integrated into the processor 1910.

[0219] The device 1900 may also include a transceiver 1930. The processor 1910 can communicate with other devices or chips via the transceiver 1930. For example, the processor 1910 can send and receive data with other devices or chips via the transceiver 1930.

[0220] Embodiments of the present disclosure further provide a computer-readable storage medium for storing a program. The computer-readable storage medium is applied to a terminal device according to an embodiment of the present disclosure, and the program causes a computer to perform the same actions as those performed by the terminal device in each embodiment of the present disclosure.

[0221] The embodiments of this disclosure further provide a computer program product, which includes a program, which is applied to a terminal device according to the embodiments of this disclosure, and which causes a computer to perform the methods performed by the terminal device in each embodiment of this disclosure.

[0222] Embodiments of the present disclosure further provide a computer program, which is applied to a terminal device according to an embodiment of the present disclosure, and which causes a computer to perform the methods performed by the terminal device in each embodiment of the present disclosure.

[0223] It should be understood that the terms “system” and “network” may be used interchangeably in this disclosure. Furthermore, any terms used in this disclosure are used solely to describe specific embodiments of this disclosure and are not intended to limit this disclosure. Terms such as “first,” “second,” “third,” and “fourth” in the specification, claims, and accompanying drawings of this disclosure are used to distinguish different objects and are not used to describe a particular order. In addition, the terms “includes” and “have,” and their variations, are intended to cover non-exclusive inclusion.

[0224] The “indications” referred to in the embodiments of this disclosure may be direct, indirect, or indicate a relationship. For example, when A indicates B, it may mean that A directly indicates B, for example, when B is obtained by A. It may also indicate that A indirectly indicates B, for example, when A indicates C and B is obtained through C. Furthermore, it may indicate that a correlation exists between A and B.

[0225] In embodiments of this disclosure, “B corresponding to A” means that B is associated with A and that 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 that B can also be determined based on A and / or other information.

[0226] In the embodiments of this disclosure, the term "corresponding" can indicate a direct or indirect correspondence between two things, a related relationship between two things, or a referent-and-directed relationship, a configuration-and-configured relationship, and so on.

[0227] As used in the embodiments of this disclosure, “includes” may mean either directly or indirectly include. Optionally, as used in the embodiments of this disclosure, “includes” may be replaced with “directs” or “used to determine.” For example, “A includes B” may be replaced with “A directs B” or “used to determine B.”

[0228] In embodiments of this disclosure, “pre-defined” or “pre-configured / pre-set” can be achieved by pre-storing a device (e.g., including terminal devices and network devices) a corresponding code, table, or other method that can be used to instruct the device on how to do so, and this disclosure does not limit the specific methods of such implementation. For example, pre-defined can refer to being defined in a protocol.

[0229] In embodiments of this disclosure, “protocol” may refer to a standard protocol in the field of communications, and may include, for example, the LTE protocol, the NR protocol, and related protocols applicable to future communications systems, but this disclosure is not limited thereto.

[0230] In the embodiments of this disclosure, the terms "and / or" describe the relationship between related objects and indicate that three relationships exist. For example, A and / or B can refer to three situations: A existing alone, A and B existing together, or B existing alone. In this specification, the letter " / " usually indicates that the preceding and following related objects are in an "or" relationship.

[0231] In the various embodiments of this disclosure, the numbering of each process described above does not indicate the order of execution, and the execution order of each process should be determined by its function and inherent logic, and does not constitute any limitation to the implementation processes of the embodiments of this disclosure.

[0232] In some embodiments provided in this disclosure, it should be understood that the disclosed systems, apparatus, and methods can be implemented in other ways. For example, the embodiments of the apparatus described above are merely schematic, and the division of units is merely a logical division of functions. In actual implementation, there may be other methods of division, such as combining multiple units or components, integrating them into another system, or ignoring or not performing some functions. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interface, apparatus, or unit, which may be electrical, mechanical, or otherwise.

[0233] Units described as isolated components may or may not be physically isolated, and components displayed as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of these units can be selected as needed to achieve the objectives of the solution in this embodiment.

[0234] Furthermore, each functional unit in each embodiment of the present disclosure may be integrated into a single processing unit, each unit may exist physically independently, or two or more units may be integrated into a single unit.

[0235] In the embodiments described above, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. Such computer program product includes one or more computer instructions. When computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. Such computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable device. Computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, computer instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center by wired (e.g., coaxial cable, fiber optic cable, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.). Such computer-readable storage medium may be any available medium that a computer can read, or a data storage device such as a server or data center that integrates one or more available media. Available media may include magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0236] The above are merely specific embodiments of the Disclosure, but the scope of protection of the Disclosure is not limited thereto. Any modifications or substitutions that a person skilled in the art could easily conceive within the scope of the art disclosed herein should be included within the scope of protection of the Disclosure. Accordingly, the scope of protection of the Disclosure shall be determined by the claims.

Claims

1. A wireless communication method, A wireless communication method comprising a terminal device transmitting or receiving a first physical sidelink shared channel (PSSCH) in a first slot, the first slot further being used for transmitting a first reference signal, the first reference signal being used for sidelink positioning.

2. The transmission block size (TBS) of the first PSSCH is determined based on a first parameter, the first parameter being associated with the first reference signal. The method according to claim 1.

3. The association of the first parameter with the first reference signal means that The first parameter is the number of orthogonal frequency division multiplexing (OFDM) symbols occupied by the first reference signal, or The first parameter is determined based on the number of OFDM symbols occupied by the first reference signal, The method according to claim 2.

4. The first parameter is instructed based on first information, and the first information is carried by second-stage sidelink control information (SCI) associated with the first PSSCH. The method according to claim 3.

5. The format of the aforementioned second-stage SCI is SCI format 2-D. The method according to claim 4.

6. The TBS of the second PSSCH is the same as the TBS of the first PSSCH, and the second PSSCH and the first PSSCH transmit the same transmission block (TB). The method according to any one of claims 3 to 5.

7. The second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-D. The method according to claim 6.

8. The second stage SCI associated with the second PSSCH includes second information, which is used to determine the TBS of the second PSSCH. The method according to claim 7.

9. If the second information is the first value, the second information indicates that the TBS of the second PSSCH is the same as the TBS of the first PSSCH, and / or If the second information is a second value, the second information indicates that the TBS of the second PSSCH is determined based on a reference value for the number of resource elements (REs) occupied by the second PSSCH. The method according to claim 8.

10. The second stage SCI associated with the second PSSCH includes third information, which is used to indicate the number of OFDM symbols occupied by the reference signal for sidelink positioning, and the number of OFDM symbols indicated by the third information is 0. The method according to any one of claims 7 to 9.

11. The second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-A, SCI format 2-B, or SCI format 2-C. The method according to claim 6.

12. The second PSSCH and the first PSSCH are, The source identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the source identifier indicated by the second-stage SCI associated with the first PSSCH. The destination identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the destination identifier indicated by the second-stage SCI associated with the first PSSCH. The HARQ process number indicated by the second-stage SCI associated with the second PSSCH is the same as the HARQ process number indicated by the second-stage SCI associated with the first PSSCH, and The value of the new data indicator (NDI) indicated by the second-stage SCI associated with the second PSSCH is the same as the value of the NDI indicated by the second-stage SCI associated with the first PSSCH, and one or more of these conditions are met. The method according to any one of claims 6 to 11.

13. The association of the first parameter with the first reference signal means that The first parameter is a reference value for the number of OFDM symbols used in the first reference signal, or The first parameter is determined based on one or more resources used to transmit the first reference signal within the slot, The method according to claim 2.

14. The second stage SCI associated with the first PSSCH includes a first indicator field, the first indicator field is used to indicate the first parameter, The method according to claim 13.

15. The number of bits occupied by the first indicator field is associated with the number of OFDM symbols used in the first reference signal. The method according to claim 14.

16. The number of OFDM symbols used in the first reference signal can take on A values, and the number of bits occupied by the first indicator field is [Math 1] Here, A is a positive integer greater than or equal to 1. The method according to claim 15.

17. The first indicator field occupies one bit, which is used to indicate that the first parameter is 0 or X, where X is a positive integer greater than or equal to 1, and X is associated with the number of OFDM symbols used for the first reference signal. The method according to claim 14.

18. The first parameter is instructed by upper-layer signaling from the first PSSCH transmitter to the first PSSCH receiver. The method according to claim 13.

19. The aforementioned upper-layer signaling includes side-link positioning protocol (SLPP) signaling or radio resource control (RRC) signaling. The method according to claim 18.

20. The TBS of the first PSSCH is determined based on a second parameter, the second parameter is determined based on the first parameter, and the second parameter represents a reference value for the number of REs available for the PSSCH within a single physical resource block (PRB). The method according to any one of claims 13 to 19.

21. The second parameter mentioned above is further, The third parameter, which represents the number of subcarriers within a single PRB, The fourth parameter, which represents the number of OFDM symbols available for sidelink transmission within a single slot, The fifth parameter represents a reference value for the number of OFDM symbols occupied by the physical side-link feedback channel (PSFCH). A sixth parameter, which represents a reference value for the number of REs occupied by the phase-tracking reference signal (PT-RS) and / or the channel state information reference signal (CSI-RS), The seventh parameter, which represents the average number of demodulation reference signal resource elements (DMRS REs) within a single slot, is determined based on one or more of the following: The method according to claim 20.

22. The second parameter satisfies the following equation: [Math 2] Here, [Math 3] represents the first parameter, [Math 4] This represents the second parameter, [Math 5] This represents the third parameter, [Math 6] This represents the fourth parameter, [Number 7] This represents the fifth parameter, [Number 8] This represents the sixth parameter, [Number 9] This represents the seventh parameter mentioned above. The method according to claim 21.

23. The number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot. The method according to claim 1.

24. The number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the maximum number of OFDM symbols included in the resource used for the first reference signal within the slot. The method according to claim 23.

25. The number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on the eighth parameter, which is: A value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot, The ninth parameter represents the number of OFDM symbols available for sidelink transmission within a single slot, and, Determined based on one or more of the tenth parameter, which represents the number of OFDM symbols occupied by PSFCH, The method according to claim 23 or 24.

26. The eighth parameter satisfies the following equation: [Number 10] Here, [Math 11] This represents the eighth parameter mentioned above, [Math 12] This represents the ninth parameter, [Number 13] This represents the tenth parameter, [Number 14] This represents a value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot. The method according to claim 25.

27. The number of REs occupied by the second-stage SCI associated with the first PSSCH is not determined based on a first scaling factor, the first scaling factor being a parameter set by upper-layer signaling to determine the number of REs occupied by the second-stage SCI. The method according to claim 1.

28. The number of REs occupied by the second-stage SCI associated with the first PSSCH is: The eleventh parameter, which represents the number of bits included in the second stage SCI, The twelfth parameter, which represents the length of the cyclic redundancy check (CRC) of the second stage SCI, The 13th parameter, which represents the coding rate offset of the second stage SCI, The 14th parameter, which represents the modulation stage of the second-stage SCI, The 15th parameter, which represents the coding rate corresponding to PSSCH, and, The sixteenth parameter, which represents the number of remaining REs in the first PRB, wherein the first PRB is the PRB in which the last modulation symbol of the second stage SCI is located, is determined based on one or more of these parameters. The method according to claim 27.

29. The number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the following equation: [Number 15] Here, [Number 16] This represents the number of REs occupied by the second stage SCI associated with the first PSSCH, O SCI2 represents the 11th parameter, L SCI2 This represents the 12th parameter, [Number 17] This represents the 13th parameter, [Number 18] represents the 14th parameter, R represents the 15th parameter, and γ represents the 16th parameter. The method according to any one of claims 28.

30. The number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the first condition, and the first condition is associated with the first scaling factor. The method according to any one of claims 27 to 29.

31. The first condition is, [Number 19] but, [Number 20] Including the following, Here, [Math 21] γ represents the number of REs occupied by the second stage SCI associated with the first PSSCH, γ represents the number of remaining REs in the first PRB, the first PRB is the PRB where the last modulation symbol of the second stage SCI is located, and α represents the first scaling coefficient. [Number 22] And, [Number 23] This represents the number of OFDM symbols available for sidelink transmission within a single slot. [Number 24] This represents the number of OFDM symbols occupied by PSFCH, [Number 25] l represents the number of REs available to map the second-stage SCI on the l-th OFDM symbol, and the value of l ranges from 0 to [Number 26] That is, The method according to claim 30.

32. The number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on a second scaling factor, the second scaling factor being associated with SCI format 2-D. The method according to claim 1.

33. The second scaling factor differs from the first scaling factor, the first scaling factor is used to determine the number of REs occupied by the second-stage SCI, and the first scaling factor is associated with SCI format 2-A, SCI format 2-B, or SCI format 2-C. The method according to claim 32.

34. The second scaling factor is smaller than the first scaling factor. The method according to claim 33.

35. The SCI format of the second-stage SCI associated with the first PSSCH described above is SCI format 2-D. The method according to any one of claims 23 to 34.

36. A terminal device, A terminal device comprising a transceiver module configured to transmit or receive a first PSSCH in a first slot, the first slot further used for transmitting a first reference signal, the first reference signal used for sidelink positioning.

37. The transmission block size (TBS) of the first PSSCH is determined based on a first parameter, the first parameter being associated with the first reference signal. The apparatus according to claim 36.

38. The association of the first parameter with the first reference signal is: The first parameter is the number of orthogonal frequency division multiplexing (OFDM) symbols occupied by the first reference signal, or The first parameter is determined based on the number of OFDM symbols occupied by the first reference signal, The apparatus according to claim 37.

39. The first parameter is instructed based on first information, and the first information is carried by second-stage sidelink control information (SCI) associated with the first PSSCH. The apparatus according to claim 38.

40. The format of the aforementioned second-stage SCI is SCI format 2-D. The apparatus according to claim 39.

41. The TBS of the second PSSCH is the same as the TBS of the first PSSCH, and the second PSSCH and the first PSSCH transmit the same transmission block (TB). The apparatus according to any one of claims 38 to 40.

42. The second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-D. The apparatus according to claim 41.

43. The second stage SCI associated with the second PSSCH includes second information, which is used to determine the TBS of the second PSSCH. The apparatus according to claim 42.

44. If the second information is the first value, the second information indicates that the TBS of the second PSSCH is the same as the TBS of the first PSSCH, and / or If the second information is a second value, the second information indicates that the TBS of the second PSSCH is determined based on a reference value of the number of resource elements (REs) occupied by the second PSSCH. The apparatus according to claim 43.

45. The second stage SCI associated with the second PSSCH includes third information, which is used to indicate the number of OFDM symbols occupied by the reference signal for sidelink positioning, and the number of OFDM symbols indicated by the third information is 0. The apparatus according to any one of claims 42 to 44.

46. The second PSSCH does not transmit a reference signal for sidelink positioning, and the SCI format of the second-stage SCI associated with the second PSSCH is SCI format 2-A, SCI format 2-B, or SCI format 2-C. The apparatus according to claim 41.

47. The second PSSCH and the first PSSCH are, The source identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the source identifier indicated by the second-stage SCI associated with the first PSSCH. The destination identifier indicated by the second-stage SCI associated with the second PSSCH is the same as the destination identifier indicated by the second-stage SCI associated with the first PSSCH. The HARQ process number indicated by the second-stage SCI associated with the second PSSCH is the same as the HARQ process number indicated by the second-stage SCI associated with the first PSSCH, and The value of NDI indicated by the second-stage SCI associated with the second PSSCH is the same as the value of NDI indicated by the second-stage SCI associated with the first PSSCH, and one or more of these conditions are met. The apparatus according to any one of claims 41 to 46.

48. The association of the first parameter with the first reference signal means that The first parameter is a reference value for the number of OFDM symbols used in the first reference signal, or The first parameter is determined based on one or more resources used to transmit the first reference signal within the slot. The apparatus according to claim 37.

49. The second stage SCI associated with the first PSSCH includes a first indicator field, the first indicator field is used to indicate the first parameter, The apparatus according to claim 48.

50. The number of bits occupied by the first indicator field is associated with the number of OFDM symbols used in the first reference signal. The apparatus according to claim 49.

51. The number of OFDM symbols used in the first reference signal can take on A values, and the number of bits occupied by the first indicator field is [Number 27] Here, A is a positive integer greater than or equal to 1. The apparatus according to claim 50.

52. The first indicator field occupies one bit, which is used to indicate that the first parameter is 0 or X, where X is a positive integer greater than or equal to 1, and X is associated with the number of OFDM symbols used for the first reference signal. The apparatus according to claim 49.

53. The first parameter is instructed by upper-layer signaling from the first PSSCH transmitter to the first PSSCH receiver. The apparatus according to claim 48.

54. The aforementioned upper-layer signaling includes side-link positioning protocol (SLPP) signaling or radio resource control (RRC) signaling. The apparatus according to claim 53.

55. The TBS of the first PSSCH is determined based on a second parameter, the second parameter is determined based on the first parameter, and the second parameter represents a reference value for the number of REs available for the PSSCH within a single physical resource block (PRB). The apparatus according to any one of claims 48 to 54.

56. The second parameter mentioned above is further, The third parameter, which represents the number of subcarriers within a single PRB, The fourth parameter, which represents the number of OFDM symbols available for sidelink transmission within a single slot, The fifth parameter represents a reference value for the number of OFDM symbols occupied by the physical side-link feedback channel (PSFCH). A sixth parameter, which represents a reference value for the number of REs occupied by the phase-tracking reference signal (PT-RS) and / or the channel state information reference signal (CSI-RS), The seventh parameter, which represents the average number of demodulation reference signal resource elements (DMRS REs) within a single slot, is determined based on one or more of the following: The apparatus according to claim 55.

57. The second parameter satisfies the following equation: [Number 28] Here, [Number 29] represents the first parameter, [Number 30] This represents the second parameter, [Number 31] This represents the third parameter, [Number 32] This represents the fourth parameter, [Number 33] This represents the fifth parameter, [Number 34] This represents the sixth parameter, [Number 35] This represents the seventh parameter mentioned above. The apparatus according to claim 56.

58. The number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot. The apparatus according to claim 36.

59. The number of REs occupied by the second stage SCI associated with the first PSSCH is determined based on the maximum number of OFDM symbols included in the resource used for the first reference signal within the slot. The apparatus according to claim 58.

60. The number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on the eighth parameter, which is: A value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot, The ninth parameter represents the number of OFDM symbols available for sidelink transmission within a single slot, and, Determined based on one or more of the tenth parameter, which represents the number of OFDM symbols occupied by PSFCH, The apparatus according to claim 58 or 59.

61. The eighth parameter satisfies the following equation: [Number 36] Here, [Number 37] This represents the eighth parameter mentioned above, [Number 38] This represents the ninth parameter, [Number 39] This represents the tenth parameter, [Number 40] This represents a value determined based on the number of OFDM symbols contained in one or more resources used for the first reference signal within the slot. The apparatus according to claim 60.

62. The number of REs occupied by the second-stage SCI associated with the first PSSCH is not determined based on a first scaling factor, the first scaling factor being a parameter set by upper-layer signaling to determine the number of REs occupied by the second-stage SCI. The apparatus according to claim 36.

63. The number of REs occupied by the second-stage SCI associated with the first PSSCH is: The eleventh parameter, which represents the number of bits included in the second stage SCI, The twelfth parameter, which represents the length of the cyclic redundancy check (CRC) of the second stage SCI, The 13th parameter, which represents the coding rate offset of the second stage SCI, The 14th parameter, which represents the modulation stage of the second-stage SCI, The 15th parameter, which represents the coding rate corresponding to PSSCH, and, The sixteenth parameter, which represents the number of remaining REs in the first PRB, wherein the first PRB is the PRB in which the last modulation symbol of the second stage SCI is located, is determined based on one or more of these parameters. The apparatus according to claim 62.

64. The number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the following equation: [Number 41] Here, [Number 42] This represents the number of REs occupied by the second stage SCI associated with the first PSSCH, O SCI2 represents the 11th parameter, L SCI2 This represents the 12th parameter, [Number 43] This represents the 13th parameter, [Number 44] represents the 14th parameter, R represents the 15th parameter, and γ represents the 16th parameter. The apparatus according to any one of claims 63.

65. The number of REs occupied by the second-stage SCI associated with the first PSSCH satisfies the first condition, and the first condition is associated with the first scaling factor. The apparatus according to any one of claims 62 to 64.

66. The first condition is, [Number 45] but, [Number 46] Including the following, Here, [Number 47] γ represents the number of REs occupied by the second stage SCI associated with the first PSSCH, γ represents the number of remaining REs in the first PRB, the first PRB is the PRB where the last modulation symbol of the second stage SCI is located, and α represents the first scaling coefficient. [Number 48] And, [Number 49] This represents the number of OFDM symbols available for sidelink transmission within a single slot. [Number 50] This represents the number of OFDM symbols occupied by PSFCH, [Number 51] l represents the number of REs available to map the second-stage SCI on the l-th OFDM symbol, and the value of l ranges from 0 to [Number 52] That is, The apparatus according to claim 65.

67. The number of REs occupied by the second-stage SCI associated with the first PSSCH is determined based on a second scaling factor, the second scaling factor being associated with SCI format 2-D. The apparatus according to claim 36.

68. The second scaling factor differs from the first scaling factor, the first scaling factor is used to determine the number of REs occupied by the second-stage SCI, and the first scaling factor is associated with SCI format 2-A, SCI format 2-B, or SCI format 2-C. The apparatus according to claim 67.

69. The second scaling factor is smaller than the first scaling factor. The apparatus according to claim 68.

70. The SCI format of the second-stage SCI associated with the first PSSCH described above is SCI format 2-D. The apparatus according to any one of claims 58 to 69.

71. A terminal device comprising memory and a processor, wherein the memory is used to store a program, and the processor calls the program in the memory to cause the terminal device to execute the method according to any one of claims 1 to 35.

72. A device comprising a processor, wherein the processor calls a program from memory and causes the device to execute the method according to any one of claims 1 to 35.

73. A chip comprising a processor, wherein the processor calls a program from memory and causes a device on which the chip is mounted to execute the method according to any one of claims 1 to 35.

74. A computer-readable storage medium in which a program is stored, wherein the program causes a computer to execute the method described in any one of claims 1 to 35.

75. A computer program product comprising a program, wherein the program causes a computer to perform the method described in any one of claims 1 to 35.

76. A computer program that causes a computer to perform the method described in any one of claims 1 to 35.

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