Lateral communication method and terminal

Abstract

The invention relates to a sidewalk communication method and a terminal. The method comprises the following steps: a first terminal sends first control information, wherein the first control information comprises SLPRS (Side Location Reference Signal) sending information and / or COT (Channel Occupation Time) sharing information; in the embodiment of the invention, the first control information sent by the terminal comprises the SLPRS information and the COT sharing information, so that the complexity of sending and / or receiving the side row control information by the terminal can be reduced.

Description

Sideline communication method and terminal Technical Field

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

[0002] To improve positioning accuracy, the 3rd Generation Partnership Project (3GPP) is studying the feasibility and performance of positioning technology based on the Sidelink Positioning Reference Signal (SL PRS). Furthermore, the COT (Channel Occupancy Time) sharing mechanism is supported in the Sidelink Over Unlicensed Spectrum (SL-U) system based on unlicensed spectrum. After initiating COT through Listen Before Talk (LBT), a terminal can share COT with other terminals. Other terminals use one of the access channels in the Type 2 LBT method, which improves resource utilization while also facilitating channel competition for SL-U terminals.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a sideline communication method and terminal, which can reduce the complexity of sending and receiving sideline control information.

[0005] The present invention provides a sideline communication method, including:

[0006] The first terminal sends first control information, where the first control information includes sidelink positioning reference signal SL PRS sending information and / or channel occupancy time COT sharing information.

[0007] The present invention provides a sideline communication method, including:

[0008] The second terminal receives the first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0009] An embodiment of the present application provides a first terminal, including:

[0010] The sending unit is configured to send first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0011] An embodiment of the present application provides a second terminal, including:

[0012] The receiving unit is configured to receive first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0013] An embodiment of the present application provides a terminal device, comprising: a transceiver, a processor, and a memory. The memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and execute the computer program stored in the memory, so that the terminal device performs the above-mentioned sideline communication method.

[0014] The embodiment of the present application provides a chip for implementing the above-mentioned sideline communication method. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the above-mentioned sideline communication method.

[0015] An embodiment of the present application provides a computer-readable storage medium for storing a computer program. When the computer program is executed by a device, the device executes the above-mentioned sideline communication method.

[0016] An embodiment of the present application provides a computer program product, including computer program instructions, which enable a computer to execute the above-mentioned sideline communication method.

[0017] An embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the above-mentioned sideline communication method.

[0018] In an embodiment of the present application, the first control information sent by the terminal includes SL PRS information and COT sharing information, which can reduce the complexity of the terminal sending and / or receiving sideline control information. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of time slot symbols used for SL transmission according to the present application.

[0020] FIG2 is a schematic diagram of the PSCCH and PSSCH time slot structure according to the present application.

[0021] FIG3 is a schematic diagram of the time domain position of PSSCH DMRS symbols according to the present application.

[0022] FIG4 is a schematic diagram of the frequency domain position of PSSCH DMRS symbols according to the present application.

[0023] FIG5 is a schematic diagram of a PSSCH PSCCH resource pool according to the present application.

[0024] FIG6 is a schematic diagram of the time slot structure of the NR system according to the present application.

[0025] FIG7 is a schematic diagram of interleaving resource blocks according to the present application.

[0026] FIG8 is a schematic diagram of an RB set according to the present application.

[0027] FIG9 is a schematic flowchart of a sideline communication method according to an embodiment of the present application.

[0028] FIG10 is a schematic flowchart of a sideline communication method according to an embodiment of the present application.

[0029] FIG11 is a schematic block diagram of a first terminal according to an embodiment of the present application.

[0030] FIG12 is a schematic block diagram of a second terminal according to an embodiment of the present application.

[0031] FIG13 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0032] FIG14 is a schematic block diagram of a chip according to an embodiment of the present application.

[0033] FIG15 is a schematic block diagram of a communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0035] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-based access to unlicensed spectrum, NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Fifth Generation (5G) system or other communication systems.

[0036] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0037] In one embodiment, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0038] In one embodiment, the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, wherein the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, wherein the authorized spectrum can also be considered as an unshared spectrum.

[0039] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0040] The terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0041] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0042] In an embodiment of the present application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0043] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0044] In an embodiment of the present application, the network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in a WLAN, an evolved base station (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or a network device in an NTN network, etc.

[0045] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Alternatively, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water.

[0046] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0047] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" is simply a description of an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates that the related objects are in an "or" relationship.

[0048] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0049] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0050] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0051] 1. Timeslot Structure in New Radio Sidelink (NR SL)

[0052] In NR-V2X, the Physical Sidelink Shared Channel (PSSCH) and its associated Physical Sidelink Control Channel (PSCCH) are transmitted in the same time slot, with the PSCCH occupying two or three time domain symbols. NR-V2X time domain resource allocation uses time slots as the allocation granularity. The parameters start symbol position (sl-startSLsymbols) and number of symbols (sl-lengthSLsymbols) are used to configure the start and length of the time domain symbols used for sidelink transmission in a time slot. The last symbol in this part of symbols is used as the guard period (GP), and PSSCH and PSCCH can only use the remaining time domain symbols. However, if the Physical Sidelink Feedback Channel (PSFCH) transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the automatic gain control (AGC) and GP symbols before this symbol.

[0053] As shown in Figure 1, the network configuration sl-StartSymbol = 3, sl-LengthSymbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time domain symbols that can be used for PSSCH transmission are symbols 3 to 9. PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0054] In NR-V2X, in addition to PSCCH and PSSCH, PSFCH may also exist in a sidelink time slot. In a time slot, the first Orthogonal Frequency Division Multiplexing (OFDM) symbol is fixed for automatic gain control (AGC). On the AGC symbol, the UE copies the information sent on the second symbol. At the end of the time slot, one symbol is reserved for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sidelink symbol. In the frequency domain, the number of physical resource blocks (PRBs) occupied by PSCCH is within the subband range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a subchannel of PSSCH, or the frequency domain resources of PSSCH include multiple subchannels, PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol where PSCCH is located.

[0055] PSSCH is used to carry second-order sidelink control information (Sidelink Control Information, SCI) and sidelink shared channel (Sidelink-Shared Channel, SL-SCH). The Third Generation Partnership Project (3GPP) defines two second-order SCI formats, namely SCI format 2-A and SCI format 2-B. SCI format 2-B is suitable for multicast communication methods that perform sidelink hybrid automatic repeat reQuest (HARQ) feedback based on distance information. SCI format 2-A is suitable for other scenarios, such as unicast, multicast, and broadcast that do not require sidelink HARQ feedback, unicast communication methods that require sidelink HARQ feedback, and multicast communication methods that require feedback of positive acknowledgment (ACK) or negative acknowledgment (NACK). 3GPP has also introduced an additional second-order SCI format, namely SCI format 2-C, which is used to indicate reference resource sets and trigger signaling in specific circumstances. The modulation symbols of the second-order SCI are mapped starting from the symbol where the first PSSCH modulation and demodulation reference signal is located, using a frequency domain first and then a time domain method. They are then interleaved and multiplexed with the resource elements (REs) of the demodulation reference symbols (DMRS). Furthermore, the modulation symbols of the second-order SCI cannot be mapped to the REs where the phase-tracking reference signals (PT-RS) are located, as shown in Figure 2.

[0056] In the sidewalk communication system, the UE's autonomous resource selection or the determination of transmission resources based on the network's sidewalk resource scheduling may cause different UEs to send PSCCH on the same time-frequency resources. In order to ensure that the receiver can detect at least one PSCCH in the event of a PSCCH resource conflict, LTE-V2X adopts a PSCCH DMRS randomization design scheme. Specifically, when sending PSCCH, the UE can randomly select a value from {0, 3, 6, 9} as the cyclic shift of the DMRS. If multiple UEs use different cyclic shifts for the PSCCH DMRS sent on the same time-frequency resources, the receiving UE can still detect at least one PSCCH through the orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCC, Orthogonal Covering Code) for random selection by the transmitting UE, as shown in Table 1, where the i-th bit of the OCC mask is applied to the i-th DMRS RE in the resource block (RB), thereby achieving the effect of distinguishing different UEs.

[0057] Table 1 PSCCH DMRS OCC mask

[0058] The DMRS for the PSSCH in NR-V2X draws on the design of the NR Uu interface and uses multiple time-domain PSSCH DMRS patterns. Within a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 2. Figure 3 shows a schematic diagram of the time-domain positions of four DMRS symbols when the PSSCH has 13 symbols.

[0059] Table 2 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0060] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation. For slow-moving UEs, a low-density DMRS pattern can be used, thereby improving spectral efficiency.

[0061] The generation method of the PSSCH DMRS sequence is almost the same as that of the PSCCH DMRS sequence. The difference lies in the initialization formula c(m) of the pseudo-random sequence. initThe CRC of the PSCCH that schedules the PSSCH is generated.

[0062] The NR physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. Moreover, for each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, and single-symbol DMRS frequency domain type 2 can support 6 DMRS ports. In the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support two DMRS ports at most, only single-symbol DMRS frequency domain type 1 is supported, as shown in Figure 4.

[0063] 2. Frequency Domain Resource Determination in NR SL

[0064] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the frequency domain resource allocation granularity is also subchannel. A subchannel contains a number of PRBs {10, 12, 15, 20, 50, 75, 100}, with the smallest subchannel size being 10 PRBs, significantly larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is primarily because the frequency domain resources of the PSCCH in NR-V2X are located within the first subchannel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a single PSSCH subchannel, while the time domain resources of the PSCCH occupy two or three OFDM symbols. If the subchannel size is configured too small, the available PSCCH resources are limited, increasing the code rate and degrading PSCCH detection performance. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resources must be less than or equal to the PSSCH subchannel size. The following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools. An example is shown below:

[0065] (1) Subchannel size (sl-Subchannel Size): indicates the number of consecutive PRBs in a subchannel in the resource pool. The value range is {10, 12, 15, 20, 50, 75, 100} PRBs;

[0066] (2) Number of subchannels (sl-Num Subchannel): indicates the number of subchannels included in the resource pool;

[0067] (3) Subchannel start RB index (sl-Start RB-Subchannel): indicates the start PRB index of the first subchannel in the resource pool;

[0068] (4) PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0069] (5) PSCCH frequency domain resource indication (sl-FreqResource PSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0070] When the UE determines the resource pool for PSSCH transmission or reception, the frequency domain resources included in the resource pool are sl-Num Subchannel consecutive subchannels starting with the PRB indicated by sl-Start RB-Subchannel . If the number of PRBs contained in the final sl-Num Subchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0071] In NR-V2X, the frequency domain starting position of the first subchannel of the PSCCH and its associated PSSCH is aligned. Therefore, the starting position of each PSSCH subchannel is the possible frequency domain starting position of the PSCCH. According to the above parameters, the frequency domain range of the resource pool of PSCCH and PSSCH can be determined, as shown in Figure 5:

[0072] In NR-V2X, PSCCH is used to carry side control information related to resource sensing, as shown in the following example:

[0073] (1) The priority of the scheduled transmission;

[0074] (2) Frequency domain resource allocation, indicating the number of frequency domain resources of the PSSCH in the current time slot scheduled by the PSCCH, as well as the number and starting position of the frequency domain resources of up to two retransmission resources reserved;

[0075] (3) Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0076] (4) PSSCH reference signal pattern;

[0077] (5) Second-order SCI format;

[0078] (6) Second-order SCI rate offset;

[0079] (7) Number of PSSCH DMRS ports;

[0080] (8) Modulation and Coding Scheme (MCS);

[0081] (9)MCS form instructions;

[0082] (10) Number of PSFCH symbols;

[0083] (11) Resource reservation period, which reserves resources for another transport block (TB) to be sent in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0084] (12) Reserved bits: 2 to 4 bits. The specific number of bits is configured or pre-configured by the network.

[0085] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0086] 3. Determination of time domain resources (time slots) in NR SL

[0087] In NR-V2X, the transmission of PSCCH / PSSCH is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot, and the transmission of multiple PSCCH / PSSCH in one time slot through time division multiplexing (TDM) is not supported. PSCCH / PSSCH between different users can be multiplexed in one time slot through frequency division multiplexing (FDM). The time domain resources of PSSCH in NR-V2X are based on the time slot granularity, but unlike the PSSCH in LTE-V2X that occupies all the time domain symbols in a subframe, the PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmission is also based on the subframe granularity, so the side transmission is also based on the subframe granularity (special subframes in the time division duplex (TDD) system are not used for side transmission). The NR system uses a flexible time slot structure, that is, a time slot includes both uplink and downlink symbols, which can achieve more flexible scheduling and reduce latency. A subframe of an NR system is shown in Figure 6. The time slot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. The downlink symbol is located at the beginning of the time slot, and the uplink symbol is located at the end of the time slot. The flexible symbols are between the downlink and uplink symbols. The number of various symbols in each time slot is configurable.

[0088] The sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact both uplink and downlink data transmission in the NR system and degrade system performance. Therefore, NR-V2X supports using a portion of the time-domain symbols in a timeslot for sidelink transmission, meaning that a portion of the uplink symbols in a timeslot are used for sidelink transmission. Furthermore, considering that sidelink transmission includes AGC and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing these symbols will leave even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0089] In the NR-V2X system, the time domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within a system frame number (SFN) period is the same as in LTE-V2X, but with the following differences:

[0090] The total number of time slots included in one SFN cycle is 10240×2 μ , where the parameter μ is related to the subcarrier spacing;

[0091] If at least one of the time-domain symbols Y, Y+1, Y+2, ..., Y+X-1 included in a time slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0092] The specific steps include:

[0093] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0094] Where: N S_SSB Indicates the number of synchronization time slots in an SFN cycle; the synchronization time slot is determined according to the synchronization-related configuration parameters, and is related to the period of transmitting the Synchronization Signal Block (SSB) and the number of transmission resources of the SSB configured in the period.

[0095] N nonSL Indicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: If at least one of the time domain symbols Y, Y+1, Y+2, ..., Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0096] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0097] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. Specifically, if a time slot lr (0 ≤ r < 10240 × 2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot,

[0098] Where: N reserved =(10240×2 μ -N S_SSB -N nonSL )mod L bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0099] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0100] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0101] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set (0≤k<(10240×2 μ -N S_SSB -N nonSL -N reserved )), when b is satisfied k′ =1, the time slot belongs to the resource pool, where

[0102] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order i∈{0, 1, ..., T′ max -1}, where T′ max Indicates the number of time slots included in the resource pool.

[0103] 4. First-order SCI and Second-order SCI in NR SL

[0104] In NR SL, a second-order SCI design is supported. The first-order SCI used to schedule the transmission of PSSCH and / or Sidelink Positioning Reference Signal (SL PRS) is called SCI format 1-A. The information included is as follows:

[0105] 1. Priority of scheduled data: 3 bits, 000 represents priority value 1, 001 represents priority value 2, and so on.

[0106] 2. Frequency resource assignment: includes a frequency resource indicator value (FRIV).

[0107] If an SCI can indicate the current transmission resource and a reserved resource for retransmission of the current transport block (TB), FRIV is bits, used to indicate the initial sub-channel index of the reserved resource and the number of sub-channels included in the current transmission resource and the one reserved resource.

[0108] If one SCI can indicate the current transmission resource and two reserved resources for the current TB retransmission, the FRIV is bits, used to indicate the initial sub-channel index of the two reserved resources and the number of sub-channels included in the current transmission resource and the two reserved resources. The number of sub-channels in the current resource pool.

[0109] 3. Time resource assignment: includes a time resource indicator value (TRIV).

[0110] If a PSCCH can indicate the current transmission resource and a reserved resource for retransmission of the current TB, TRIV is 5 bits, which is used to indicate the time slot interval of the reserved resource relative to the current transmission resource.

[0111] If one PSCCH can indicate the current transmission resource and two other reserved resources for retransmission of the current TB, TRIV is 9 bits, used to indicate the time slot interval of the two reserved resources relative to the current transmission resource, and the time slot interval is expressed as the number of time slots belonging to the current resource pool.

[0112] 4. PSSCH reference signal pattern, bits, where N patternThe number of DMRS patterns allowed in the current resource pool.

[0113] 5. Second-level SCI format, 2 bits. 00 represents SCI format 2-A, 01 represents SCI format 2-B, 10 represents SCI format 2-C, and 11 is reserved for future versions.

[0114] 6. Second-order SCI rate offset: 2 bits, 00, 01, 10, and 11 represent the first, second, third, and fourth rate offset values ​​configured by the RRC layer, respectively.

[0115] 7.PSSCH DMRS port number: 1 bit, 0 indicates one port (port 1000), 1 indicates two ports (ports 1000 and 1001)

[0116] 8. Modulation and Coding Scheme (MCS): 5 bits.

[0117] 9. MCS table indication: 0 to 2 bits, depending on the number of MCS tables allowed to be used configured in the resource pool.

[0118] 10. PSFCH symbol number: 1 bit if the PSFCH period is 2 or 4 time slots, otherwise 0 bit.

[0119] 11. Resource Reservation Period: 4 bits; reserves resources for transmission by another TB in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0120] 12. Reserved bits: 2 to 4 bits. The specific number of bits is configured by the network or pre-configured. If the resource pool is configured to indicate whether a terminal supports receiving resource conflict indication using the least significant bit (LSB) of the reserved bits, the first reserved bit is set to "1" if the terminal supports this function; otherwise, it is set to "0". All other reserved bits are set to "0".

[0121] NR SL defines four second-order SCI formats, namely SCI Format 2-A, SCI Format 2-B, SCI Format 2-C and SCI Format 2-D.

[0122] For example, SCI format 2-A has 35 bits and contains the following information:

[0123] HARQ process - 4 bits;

[0124] New Data Indicator (NDI) - 1 bit;

[0125] Redundancy Version (RV) - 2 bits;

[0126] Source ID - 8 bits;

[0127] Target ID - 16 bits;

[0128] HARQ feedback activation / deactivation - 1 bit;

[0129] Unicast / multicast / broadcast indication - 2 bits; 00 indicates broadcast, 01 indicates multicast communication mode requiring feedback of ACK or NACK, 10 indicates unicast, and 11 indicates multicast communication mode requiring feedback of only NACK;

[0130] CSI feedback request - 1 bit.

[0131] For example, SCI format 2-B has a total of 48 bits and is only used to indicate the transmission of multicast services. Therefore, compared with SCI format 2-A, SCI format 2-B does not include the unicast / multicast / broadcast indication field and the CSI feedback request field, but additionally includes the following two information fields:

[0132] Zone ID - 12 bits;

[0133] Communication distance requirement - 4 bits.

[0134] For example, SCI format 2-C is used to carry an inter-UE coordination request or inter-UE coordination information, and the information included in the indication is divided into two parts. The first part is the other bit fields in SCI format 2-A except the "unicast / multicast / broadcast indication" field.

[0135] If the SCI format 2-C carries an inter-UE coordination request, the second part contains the following additional information:

[0136] 1. Trigger signaling or reference resource set indication - 1 bit;

[0137] 2. Priority - 3 bits;

[0138] 3. Number of sub-channels - bits, of which is the number of sub-channels in the current resource pool;

[0139] 4. Resource reservation period: If periodic resource reservation is allowed in the current resource pool, then bits, where N rsv_period The total number of resource reservation cycles configured in the current resource pool;

[0140] If periodic resource reservation is not allowed in the current resource pool, the bit is 0;

[0141] 5. Resource selection window- Bits used to indicate the direct frame number (DFN) and time slot index corresponding to the start and end points of the resource selection window. μ = 0, 1, 2, 3 are subcarrier spacing indices.

[0142] 6. Resource type: If the current resource pool is configured so that the resource type is determined by UE-B, this bit is 1; otherwise, this bit is 0.

[0143] If SCI format 2-C carries inter-UE coordination information, the second part contains the following additional information:

[0144] 1. Trigger signaling or reference resource set indication - 1 bit;

[0145] 2. 2 combinations of {TRIV, FRIV, reserved period} - 2(N TRIV +N FRIV +Y) bits: N TRIV =9:

[0146] If periodic resource reservation is allowed in the current resource pool, then bit, otherwise it is 0 bit;

[0147] 3. First resource time domain position - 8 bits, used to indicate the interval of the first resource in the second TRIV relative to the reference time slot, in time slots, with a value range of 0 to 255;

[0148] 4. Reference time slot -10+ Bit, used to indicate the DFN and time slot index of the reference time slot, μ = 0, 1, 2, 3 is the subcarrier spacing index;

[0149] 5. The first resource frequency domain position - Bit used to indicate the frequency domain starting position of the first resource in the first TRIV and the second TRIV.

[0150] For example, SCI format 2-D is used to indicate SL PRS transmission and specifically includes the following information:

[0151] SL PRS Resource ID- bits, where N SL-PRS Indicates the number of SL PRS resources configured / pre-configured in a time slot in the shared resource pool for SL PRS and SL communication.

[0152] SL PRS request - 1 bit, used to trigger the receiving UE to send SL PRS.

[0153] Embedded SCI format - 2 bits, indicating the format of the embedded SCI, as shown in Table 3.

[0154] Embedded SCI Payload - Information contained in the second-level SCI indicated by the "Embedded SCI Format" field.

[0155] Table 3 Correspondence between the value of the embedded SCI format field and the embedded SCI payload

[0156] 5. Sidelink transmission in unlicensed spectrum (SL-U)

[0157] When performing sidelink transmission (SL-U) on unlicensed spectrum, the sidelink transmission needs to meet specific regulatory requirements, including the minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD) requirements. For the OCB requirement, when the UE uses the channel for data transmission, the occupied channel bandwidth shall not be less than 80% of the channel bandwidth. For the maximum power spectral density requirement, the power transmitted by the UE per 1MHz shall not exceed 10dBm. In order to meet the OCB and PSD regulatory requirements, the sidelink transmission on the unlicensed spectrum needs to adopt an interlaced resource block (IRB) structure. An IRB includes N discrete RBs in the frequency domain, and a total of M IRBs are included in the frequency band. The RBs included in the mth IRB are {m, M+m, 2M+m, 3M+m,...}.

[0158] As shown in Figure 7, the system bandwidth consists of 20 RBs, including 5 IRBs (i.e., M = 5). Each IRB consists of 4 RBs (i.e., N = 4). Adjacent RBs in the same IRB have the same frequency domain spacing, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB index. In the SL-U system, if IRB-based resource allocation granularity is adopted, the PSCCH, PSSCH, and PSFCH in the SL-U system also adopt the IRB structure.

[0159] In the unlicensed spectrum, the UE accesses the channel through LBT. LBT uses a granularity of 20 MHz in the frequency domain. Every 20 MHz is called an RB set. A carrier can include multiple RB sets, and there is a guard interval between RB sets, as shown in Figure 8.

[0160] The SL-U system supports a channel occupancy time (COT) sharing mechanism similar to that of NR-U. After a terminal initiates COT through LBT, it can share COT with other terminals. Other terminals use an access channel in the Type 2 LBT method, which improves resource utilization and facilitates SL-U terminals to compete for channels. To share COT with other terminals through indication signaling, the following information field (hereinafter referred to as COT sharing information) needs to be provided in the indication signaling:

[0161] Channel Access Priority Class (CAPC) - 2 bits. This field indicates the channel access priority of the terminal initiating the COT.

[0162] Unicast / multicast / broadcast indication - 2 bits;

[0163] COT shared ID information - 24 bits;

[0164] Remaining COT time length - bits, this field is used to indicate the remaining COT length that can be attempted after receiving the signaling.

[0165] In unlicensed spectrum, UEs must first perform LBT before they can access the channel. However, the time it takes for the UE to complete LBT is uncertain. If a UE is restricted to transmitting from the start of a time slot, it may miss a transmission opportunity if it fails to complete LBT before that time. Therefore, SL-U considers adding a transmission starting point within a time slot, i.e., multi-start transmission. For example, the additional starting point can be the third or fourth OFDM symbol in the time slot.

[0166] 6. Positioning based on sidelink

[0167] Within 3GPP, the 3GPP Radio Access Network (RAN) is conducting research on "NR Positioning Enhancements" and "Scenarios and Requirements for NR Positioning Use Cases in Coverage, Partial Coverage, and Out-of-Coverage." The "Scenarios and Requirements for NR Positioning Use Cases in Coverage, Partial Coverage, and Out-of-Coverage" study focuses on V2X and public safety use cases. Additionally, the 3GPP SA1 working group is developing requirements for "Ranging-Based Services" and positioning accuracy requirements for IIoT use cases in out-of-coverage scenarios. 3GPP needs to research and develop sidelink positioning solutions to support the use cases, scenarios, and requirements identified in these activities.

[0168] To improve positioning accuracy, especially for UEs outside cellular network coverage, 3GPP completed feasibility and performance studies on positioning technology based on side-track positioning reference signals in the early stages of Rel-18. Next, 3GPP will standardize solutions for side-track positioning (including ranging and direction finding) in NR systems, including:

[0169] 1. Standardized Sidelink Positioning Reference Signal (SL PRS): SL PRS uses a frequency domain structure based on a comb (not excluding the full RE mapping mode), adopts a sequence format based on a pseudo-random sequence, takes the DL-PRS sequence as the design starting point, and supports a maximum SL PRS bandwidth of 100 MHz in FR1.

[0170] 2. Standardize the measurement quantities used to support SL RTT, SL-AOA and SL-TDOA positioning methods.

[0171] 3. Standardize SL PRS resource allocation schemes, including Scheme 1 and Scheme 2. Scheme 1 involves network-allocated SL PRS resources, while Scheme 2 involves UE-independent SL PRS resource selection. Support is provided for both a shared resource pool for SL PRS and Rel-16 / 17 / 18 sidelink communications, as well as a dedicated SL PRS resource pool. For Scheme 2, research and standardization are required for at least one of the following: channel sensing-based resource selection, random resource selection, congestion control, and UE-coordinated resource selection.

[0172] 4. Standardize the open-loop power control mechanism for SL PRS transmission, etc.

[0173] From the above introduction, it can be seen that NR SL has currently defined four different second-order SCI formats. In an embodiment of the present application, when SL PRS and SL communications coexist in a resource pool of unlicensed spectrum (also known as shared spectrum), the second-order SCI can be used to indicate SL PRS information and COT sharing information.

[0174] FIG9 is a schematic flow chart of a sideline communication method 900 according to an embodiment of the present application. The method includes at least part of the following contents.

[0175] S910. The first terminal sends first control information, where the first control information includes sidelink positioning reference signal (SL PRS) sending information and / or channel occupancy time (COT) sharing information.

[0176] In an embodiment of the present application, if SL PRS and SL communications coexist in a resource pool of unlicensed spectrum (also known as shared spectrum), SL PRS transmission information and COT sharing information can be carried by first control information. SL PRS transmission information can be referred to as SL PRS information. The first control information can be a sideline control information sent by the first terminal to the second terminal.

[0177] In one embodiment, the SL PRS sending information includes at least one of the following:

[0178] SL PRS resource identifier;

[0179] SL PRS Request.

[0180] In one embodiment, the COT shared information includes at least one of the following:

[0181] Channel access priority;

[0182] Unicast, multicast or broadcast indication;

[0183] COT shared identification information;

[0184] The remaining COT time length.

[0185] For example, the channel access priority class (CAPC) may be 2 bits, used to indicate the channel access priority of the terminal initiating the COT;

[0186] The unicast / multicast / broadcast indication may be 2 bits, used to indicate whether the transmission mode is unicast, multicast, or broadcast;

[0187] The COT shared ID information may be 24 bits, and is used to indicate identification information of the COT shared information;

[0188] The remaining COT time length can be bits, used to indicate the remaining COT length that can be attempted after receiving the signaling; where μ is the subcarrier spacing index.

[0189] In one implementation, the first control information is the second-order SCI, and whether the second-order SCI includes the SL PRS sending information and / or the COT sharing information is indicated by the first-order SCI.

[0190] In an embodiment of the present application, SL PRS sending information and COT sharing information can be carried in the second-order SCI. The first SCI sent by the first terminal in a resource pool can indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information. The first-order SCI can be SCI format 1-A. The first-order SCI and the second-order SCI can be sent through the same information or through different information. For example, the first terminal sends the first-order SCI and first control information to the second terminal, the first control information includes the second-order SCI, and the second-order SCI includes SL PRS sending information and / or COT sharing information.

[0191] In one embodiment, the first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

[0192] In an embodiment of the present application, a first SCI sent by a first terminal within a resource pool may include a first information field, which may include a newly added bit in the first SCI or a reserved bit in the first SCI. The first information field may indicate, in an unlicensed spectrum scenario, whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

[0193] In one embodiment, the first information field is a COT shared information indication field. The first information field may also be named other than the first information field, as long as it can indicate whether the second-order SCI includes COT shared information. The specific name is not limited. The first information field may include one or more bits.

[0194] In one embodiment, the COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

[0195] In one embodiment, the second-level SCI format includes at least one of the following information:

[0196] Embedded in SCI format;

[0197] Embed SCI payload.

[0198] In an embodiment of the present application, different values ​​of the second-order SCI format field indicate different second-order SCI formats, and the value of the COT shared information indication field indicates whether a certain second-order SCI format includes COT shared information. For example, the second-order SCI format includes SCI format 2-A, SCI format 2-B, SCI format 2-C, and SCI format 2-D. The value of the second-order SCI format field is 11, indicating that the second-order SCI format is SCI format 2-D. In this case, the value of the COT shared information indication field is 1, indicating that SCI format 2-D includes COT shared information; the value of the COT shared information indication field is 0, indicating that SCI format 2-D does not include COT shared information. Alternatively, the value of the COT shared information indication field is 0, indicating that SCI format 2-D includes COT shared information; the value of the COT shared information indication field is 1, indicating that SCI format 2-D does not include COT shared information.

[0199] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes the COT shared information field. For example, the value of the second-order SCI format field may indicate whether the first format is SCI format 2-A, SCI format 2-B, SCI format 2-C, or SCI format 2-D. The value of the COT shared information indication field may indicate whether the SCI format 2-A, SCI format 2-B, SCI format 2-C, or SCI format 2-D includes the COT shared information field.

[0200] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

[0201] In one embodiment, the first format comprises SCI format 2-D.

[0202] In one embodiment, the second format includes SCI format 2-A, and the second format includes SCI format 2-B.

[0203] For example, the value of the second-order SCI format field may indicate that the first format is SCI format 2-D. The value of the COT shared information indication field may indicate whether SCI format 2-A or SCI format 2-B embedded in the SCI format field in SCI format 2-D includes a COT shared information field.

[0204] In one embodiment, the first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario, and the fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

[0205] In an embodiment of the present application, the second information field may reuse the second SCI format field to indicate the second-order SCI format and whether the second-order SCI format includes COT sharing information. The same value of the second SCI format field may indicate different second-order SCI formats in the authorized spectrum scenario and the unauthorized spectrum scenario. For example, the value of the second SCI format field is 11, which indicates the first format such as SCI format 2-D in the authorized spectrum scenario and the newly added fourth format such as SCI format 2-E in the unauthorized spectrum scenario. In one example, SCI format 2-E may include SL PRS sending information and COT sharing information, and SCI format 2-E may also include information in SCI format 2-A or SCI format 2-B. Among them, COT sharing information may be in SCI format 2-A or SCI format 2-B in SCI format 2-E.

[0206] In one embodiment, the second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

[0207] In one embodiment, the unlicensed spectrum scenario includes a first SCI of SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SL BWP is configured with parameters indicating PSCCH and PSSCH structures.

[0208] In one embodiment, the first-level SCI format includes SCI format 1-A.

[0209] In one embodiment, the first format includes SCI format 2-D, and the fourth format includes SCI format 2-E.

[0210] In one example, for the first SCI of SCI format 1-A sent within a resource pool, if the current operation is accompanied by shared spectrum channel access, or the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structures, then the SCI format 1-A may include a specific bit field, such as a first information field, used to indicate whether the second-order SCI scheduled by the SCI format 1-A includes COT sharing information.

[0211] In another example, for the first SCI of SCI format 1-A sent within a resource pool, if the current operation is accompanied by shared spectrum channel access, or parameters indicating the PSCCH and PSSCH structures are configured on the current SL BWP, the second-order SCI format field in the SCI format 1-A indicates that the scheduled second-order SCI format includes SCI format 2-E; otherwise, the second-order SCI format field in the SCI format 1-A indicates that the scheduled second-order SCI format includes SCI format 2-D.

[0212] In one embodiment, the first-order SCI includes a third information field, and the third information field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information. The third information field may include one or more bits. For example, the value of the third indication field is the first value, and the value of the second-order SCI format field is the second value, which can jointly indicate that the second-order SCI format is a newly added fourth format such as SCI format 2-E. For specific examples of the information in SCI format 2-E, please refer to the relevant description of the above embodiments. For example, the first value can be 1 or 0, and the second value can be 00, 01, 10, 11, etc. For another example, the first value can be 11 or 00, and the second value can be 000, 001, 010, 011, etc.

[0213] In one embodiment, the third information field is an additional format field. In an embodiment of the present application, the additional format field may also be referred to as an additional indication field, an additional format indication field, etc., and can be used to indicate more second SCI formats. For example, when the additional format field is 0, the value of the second-order SCI format field indicates the original second SCI format. When the additional format field is 1, the value of the second-order SCI format field indicates the newly added second SCI format. Alternatively, when the additional format field is 1, the value of the second-order SCI format field indicates the original second SCI format. When the additional format field is 0, the value of the second-order SCI format field indicates the newly added second SCI format. For example, when the additional format field is 0 and the value of the second-order SCI format field is 00, SCI format 2-A is indicated. When the additional format field is 1 and the value of the second-order SCI format field is 00, SCI format 2-E is indicated. The third information field may also be other names, as long as it can indicate more second SCI formats, and the specific name is not limited.

[0214] In one embodiment, the first-order SCI includes a fourth information field, and the fourth information field and the second-order SCI format field jointly indicate that the second-order SCI format includes a fourth format and a fifth format. In an embodiment of the present application, two newly added second-order SCI formats are jointly indicated by the fourth information field and the second-order SCI format field. The fourth information field may include one or more bits. For example, the value of the fourth indication field is the third value, and the value of the second-order SCI format field is the fourth value, which can jointly indicate that the second-order SCI format is a newly added fourth format such as SCI format 2-E, and a fifth format such as SCI format 2-F. For example, the third value can be 1 or 0, and the fourth value can be 00, 01, 10, 11, etc. For another example, the third value can be 11 or 00, and the fourth value can be 000, 001, 010, 011, etc.

[0215] In one embodiment, the fourth information field is an additional format field. For example, if the additional format field is 0 and the value of the second-order SCI format field is 00, it indicates SCI format 2-A. If the additional format field is 1 and the value of the second-order SCI format field is 00, it indicates SCI format 2-E. If the additional format field is 0 and the value of the second-order SCI format field is 01, it indicates SCI format 2-B. If the additional format field is 1 and the value of the second-order SCI format field is 01, it indicates SCI format 2-F. The fourth information field can also be named other names, as long as it can indicate more second SCI formats, and the specific name is not limited.

[0216] In one embodiment, the fourth format includes the SL PRS sending information, the COT sharing information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT sharing information, and the information in the third format.

[0217] In one embodiment, the fourth format includes SCI format 2-E, and the fifth format includes SCI format 2-F.

[0218] In an embodiment of the present application, in the two newly added SCI formats jointly indicated by the fourth information field and the second-order SCI format field, each newly added SCI format may include SL PRS sending information and COT sharing information, and may also include information of an existing second-order SCI format. For example, the second format is SCI format 2-A, the third format is SCI format 2-B, the fourth format is SCI format 2-E, and the fifth format is SCI format 2-F. Among them, SCI format 2-E includes the information in SCI format 2-A, SL PRS sending information and COT sharing information. SCI format 2-F includes the information in SCI format 2-B, SL PRS sending information and COT sharing information.

[0219] In one embodiment, the first-order SCI includes a fifth information field, and the fifth information field, in conjunction with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI formats include a fourth format, a fifth format, and a sixth format.

[0220] In one embodiment, the fourth format includes SCI format 2-E, the fifth format includes SCI format 2-F, and the sixth format includes SCI format 2-G.

[0221] In an embodiment of the present application, three newly added second-order SCI formats are indicated by the fifth information field and the second-order SCI format field. The fifth information field may include one or more bits. For example, the value of the fifth indication field is the fifth value, and the value of the second-order SCI format field is the sixth value, which may jointly indicate that the second-order SCI format is a newly added fourth format such as SCI format 2-E, a fifth format such as SCI format 2-F, and a sixth format such as SCI format 2-G. For example, the fifth value may be 1 or 0, and the sixth value may be 00, 01, 10, 11, etc. For another example, the fifth value may be 11 or 00, and the sixth value may be 000, 001, 010, 011, etc.

[0222] In one embodiment, the fifth information field is an additional format field. For example, if the additional format field is 0 and the value of the second-order SCI format field is 00, it indicates SCI format 2-A. If the additional format field is 1 and the value of the second-order SCI format field is 00, it indicates SCI format 2-E. If the additional format field is 0 and the value of the second-order SCI format field is 01, it indicates SCI format 2-B. If the additional format field is 1 and the value of the second-order SCI format field is 01, it indicates SCI format 2-F. If the additional format field is 0 and the value of the second-order SCI format field is 10, it indicates SCI format 2-C. If the additional format field is 1 and the value of the second-order SCI format field is 10, it indicates SCI format 2-G. The fifth information field can also be other names, as long as it can indicate more second SCI formats, and the specific name is not limited.

[0223] In one embodiment, the embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format. In an embodiment of the present application, among the three newly added SCI formats jointly indicated by the fourth information field and the second-order SCI format field, each newly added SCI format may include COT shared information and may also include information of an existing second-order SCI format. For example, the second format is SCI format 2-A, the third format is SCI format 2-B, the fourth format is SCI format 2-E, and the fifth format is SCI format 2-F. Among them, SCI format 2-E includes information in SCI format 2-A and COT shared information. SCI format 2-F includes information in SCI format 2-B and COT shared information.

[0224] In one embodiment, the sixth format also includes the SL PRS transmission information. In this embodiment of the present application, the fourth and fifth formats may not include the SL PRS transmission information, but the SL PRS transmission information may be included in the sixth format, such as SCI format 2-G.

[0225] FIG10 is a schematic flow chart of a sideline communication method 1000 according to an embodiment of the present application. The method includes at least part of the following contents.

[0226] S1010. The second terminal receives first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0227] In one implementation, the first control information is the second-order SCI, and whether the second-order SCI includes the SL PRS sending information and / or the COT sharing information is indicated by the first-order SCI.

[0228] In one embodiment, the first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

[0229] In one implementation, the first information field is a COT shared information indication field.

[0230] In one embodiment, the COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

[0231] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes the COT shared information field.

[0232] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

[0233] In one embodiment, the first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario, and the fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

[0234] In one embodiment, the second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

[0235] In one embodiment, the unlicensed spectrum scenario includes a first SCI of SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SL BWP is configured with parameters indicating PSCCH and PSSCH structures.

[0236] In one embodiment, the first-order SCI includes a third information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information.

[0237] In one embodiment, the third information field is an additional format field.

[0238] In one embodiment, the first-level SCI includes a fourth information field, and the fourth information field, in conjunction with the second-level SCI format field, indicates that the second-level SCI format includes a fourth format and a fifth format.

[0239] In one embodiment, the fourth information field is an additional format field.

[0240] In one embodiment, the fourth format includes the SL PRS sending information, the COT sharing information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT sharing information, and the information in the third format.

[0241] In one embodiment, the first-order SCI includes a fifth information field, and the fifth information field, in conjunction with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI formats include a fourth format, a fifth format, and a sixth format.

[0242] In one embodiment, the fifth information field is an additional format field.

[0243] In one embodiment, the embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format.

[0244] In one implementation, the sixth format also includes the SL PRS sending information.

[0245] In one embodiment, the first format comprises SCI format 2-D.

[0246] In one embodiment, the second format includes SCI format 2-A, and the second format includes SCI format 2-B.

[0247] In one embodiment, the fourth format comprises SCI format 2-E.

[0248] In one embodiment, the fifth format comprises SCI format 2-F.

[0249] In one embodiment, the sixth format comprises SCI format 2-G.

[0250] In one embodiment, the first-level SCI format includes SCI format 1-A.

[0251] In one embodiment, the second-level SCI format includes at least one of the following information:

[0252] Embedded in SCI format;

[0253] Embed SCI payload.

[0254] In one embodiment, the SL PRS sending information includes at least one of the following:

[0255] SL PRS resource identifier;

[0256] SL PRS Request.

[0257] In one embodiment, the COT shared information includes at least one of the following:

[0258] Channel access priority;

[0259] Unicast, multicast or broadcast indication;

[0260] COT shared identification information;

[0261] The remaining COT time length.

[0262] For a specific example of the second terminal executing the method 1000 of this embodiment, reference may be made to the relevant description about the second terminal in the above method 900 , which will not be repeated here for the sake of brevity.

[0263] The sidewalk communication method of the embodiment of the present application may include a method for sending control information in sidewalk positioning based on unlicensed spectrum, which may mainly include the following methods:

[0264] Method 1: SL PRS transmission information and COT sharing information are indicated through SCI format 2-D. In unlicensed spectrum, SCI format 1-A contains a bit field to indicate whether COT sharing information is included in the scheduled SCI format 2-D. This bit field can be an additional bit field or one of the reserved bit fields.

[0265] Method 2: SL PRS transmission information and COT shared information are indicated through a new second-order SCI. For example, SCI format 2-E can include one of SCI formats 2-A and 2-B, and can also include COT shared information and SL PRS transmission information.

[0266] Method 3: COT shared information and SL PRS transmission information are transmitted via at least two new second-order SCI formats. For example, SCI format 2-E can include SCI format 2-A, COT shared information, and SL PRS transmission information, and SCI format 2-F can include SCI format 2-B, COT shared information, and SL PRS transmission information.

[0267] Method 4: COT shared information is transmitted via at least two new second-order SCI formats. For example, SCI format 2-E can include SCI format 2-A and COT shared information, and SCI format 2-F can include SCI format 2-B and COT shared information. Furthermore, SCI format 2-D or 2-G can be used to indicate that the SL PRS is transmitting information. For example, 2-G can include 2-E or 2-F.

[0268] In the embodiment of the present application, the second-order SCI indication SL PRS transmission information and COT sharing information can be sent on the unlicensed spectrum. The following are several specific examples.

[0269] Example 1: SL PRS transmission information is indicated through SCI format 2-D, and SCI format 2-D can include COT sharing information.

[0270] In this example, for an SCI format 1-A sent within a resource pool, if the current operation is accompanied by shared spectrum channel access (Shared spectrum channel access), or the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structure (sl-Transmission Structure For PSCCH and PSSCH), then the SCI format 1-A contains a specific bit field for indicating whether the second-order SCI scheduled by the SCI format 1-A contains COT shared information. This bit field is hereinafter referred to as the COT shared information indication field. The COT shared information indication field can be an additional bit field added to the existing bit field of the existing SCI format 1-A, or a specific bit in the reserved bit field (Reserved) of the SCI format 1-A.

[0271] When SL PRS resources are configured / pre-configured in the resource pool, that is, the current resource pool is a SL PRS and SL communication shared resource pool, the sending of SL PRS and COT shared information can be indicated through the "COT shared information indication" field and the "second-order SCI format" field. An example is shown in Table 4.

[0272] Table 4: Correspondence between the values ​​of the "COT shared information indication" field and the "second-order SCI format" field and the second-order SCI format

[0273] For another example, the "COT shared information indication" field and the "second-level SCI format" field may be used to indicate whether the SCI format 2-D includes COT shared information. An example is shown in Table 5.

[0274] Table 5: Correspondence between the values ​​of the "COT shared information indication" field and the "second-order SCI format" field and the second-order SCI format

[0275] This example can reuse the second-order SCI format, avoiding the introduction of additional second-order SCI formats, which helps reduce the complexity of terminal implementation.

[0276] Example 2: Send a new second-order SCI format to carry SL PRS sending information and COT sharing information.

[0277] In this example, a new second-order SCI format, such as SCI format 2-E, can be defined. This SCI format 2-E includes a COT shared information field, an embedded SCI format indication field, an embedded SCI payload, and an SL PRS transmission information indication field. The UE indicates the COT shared information and the information indicating data reception in SCI format 2-A or SCI format 2-B by sending SCI format 2-E. Information in SCI format 2-C is not sent through SCI format 2-E.

[0278] According to the first implementation method of this example, for the SCI format 1-A sent within a resource pool, if the current operation is accompanied by shared spectrum channel access (Shared spectrum channel access), or the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structure (sl-Transmission Structure For PSCCH and PSSCH), the "Second-order SCI format" field in the SCI format 1-A indicates the format of the scheduled second-order SCI, including SCI format 2-E, as shown in Table 6.

[0279] Table 6: The value of the "Second-order SCI format" field indicates SCI format 2-E in unlicensed spectrum.

[0280] According to the second implementation method of this example, for the SCI format 1-A sent in a resource pool, if the current operation is accompanied by shared spectrum channel access (Shared spectrum channel access), or the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structure (sl-TransmissionStructureForPSCCHandPSSCH), then the SCI format 1-A contains a specific bit field, hereinafter referred to as the "additional format indication" field. The "additional format indication" field and the "second-order SCI format" field jointly indicate the format of the scheduled second-order SCI, including SCI format 2-E, as shown in Table 7.

[0281] Table 7: The values ​​of the "Additional format indication" field and the "Second-level SCI format" field and the corresponding relationship between the second-level SCI format

[0282] For example, the following information can be sent using SCI Format 2-E:

[0283] 1. Channel Access Priority Class (CAPC) - 2 bits. This field is used to indicate the channel access priority of the terminal initiating COT.

[0284] 2. Unicast / multicast / broadcast indication - 2 bits.

[0285] 3. COT shared ID information - 24 bits.

[0286] 4. Remaining COT time length - bits, this field is used to indicate the remaining COT length that can be attempted after receiving the signaling.

[0287] 5. Embedded SCI format - 2 bits, indicating the format of the embedded SCI, as shown in Table 8.

[0288] 6. Embedded SCI Payload - Information contained in the second-level SCI indicated by the "Embedded SCI Format" field.

[0289] 7. SL PRS transmission information or reserved bits, if it is SL PRS transmission information including:

[0290] (1) SL PRS Resource ID - bits, where N SL-PRS Indicates the number of SL PRS resources configured / pre-configured in a time slot in the shared resource pool for SL PRS and SL communication.

[0291] (2) SL PRS request - 1 bit, used to trigger the receiving UE to send SL PRS.

[0292] Table 8 Correspondence between the value of the embedded SCI format field and the embedded SCI payload and "SL PRS transmission information"

[0293] In this example, the UE can indicate SL PRS and COT sharing information at the same time by sending a new second-order SCI format, which is beneficial to reducing the number of second-order SCIs that the UE needs to support. At the same time, through the first implementation method of this example, it can also avoid increasing the number of bits of SCI format 1-A.

[0294] Example 3: Define at least two second-order SCI formats that can carry SL PRS transmission information and COT shared information, and the UE sends one of them to indicate SL PRS and COT shared information.

[0295] In this example, at least two new second-order SCI formats can be defined, such as SCI format 2-E and SCI format 2-F. SCI format 2-E includes the SL PRS transmission information field, the COT shared information field, and the information in SCI format 2-A; SCI format 2-F includes the SL PRS transmission information field, the COT shared information field, and the information in SCI format 2-B. The UE indicates the SL PRS, COT shared information, and the information indicating data reception in SCI format 2-A or 2-B by sending SCI format 2-E or SCI format 2-F.

[0296] Specifically, the following information is sent via SCI format 2-E or 2-F. It should be noted that this application does not limit the order of the following information fields:

[0297] 1. Channel Access Priority Class (CAPC) - 2 bits. This field is used to indicate the channel access priority of the terminal initiating COT.

[0298] 2. Unicast / multicast / broadcast indication - 2 bits.

[0299] 3. COT shared ID information - 24 bits.

[0300] 4. Remaining COT time length - bits, this field is used to indicate the remaining COT length that can be attempted after receiving the signaling.

[0301] 5. Information in SCI Format 2-A (SCI Format 2-E), or information in SCI Format 2-B (SCI Format 2-F).

[0302] 6. SL PRS sending information may include the following exemplary implementations:

[0303] In the first implementation, an example of the information field included in the bit field is as follows:

[0304] (1) SL PRS Resource ID - bits, where N SL-PRS Indicates the number of SL PRS resources configured / pre-configured in a time slot in the shared resource pool for SL PRS and SL communication. A value of this field, for example, N SL-PRS , it indicates that no SL PRS is sent in the current time slot.

[0305] (2) SL PRS request - 1 bit, used to trigger the receiving UE to send SL PRS.

[0306] In the second implementation, an example of the information field included in the bit field is as follows:

[0307] (1) SL PRS activation / deactivation - 1 bit, used to indicate whether SL PRS is sent in this time slot.

[0308] (2) SL PRS Resource ID - bits, where N SL-PRS Indicates the number of SL PRS resources configured / pre-configured in a time slot in the shared resource pool for SL PRS and SL communication.

[0309] (3) SL PRS request - 1 bit, used to trigger the receiving UE to send SL PRS.

[0310] In this example, for SCI format 1-A transmitted within a resource pool, if the current operation is accompanied by shared spectrum channel access (Shared spectrum channel access), or if the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structure (sl-Transmission Structure For PSCCH and PSSCH), the SCI format 1-A includes a specific bit field, hereinafter referred to as the "Additional Format Indication" field. The "Additional Format Indication" field and the "Second-Order SCI Format" field jointly indicate the format of the scheduled second-order SCI, including SCI formats 2-E and 2-F.

[0311] An example of the second-order SCI format scheduled by jointly indicating the "Additional format indication" field and the "Second-order SCI format" field is shown in Table 9:

[0312] Table 9: Correspondence between the values ​​of the "Additional format indication" field and the "Second-level SCI format" field and the second-level SCI format

[0313] Since SCI format 2-B has more bits than SCI format 2-A, in Example 2, when COT shared information and SCI format 2-A are sent together, padding bits need to be sent. This example can avoid this problem and reduce the amount of data in the control information sent.

[0314] Example 4: Define two second-order SCI formats that can carry COT shared information, and a second-order SCI format that includes one of the above and SL PRS transmission.

[0315] In this example, two new second-order SCI formats may be defined, such as SCI format 2-E and SCI format 2-F. The information contained in SCI formats 2-E and 2-F may be substantially the same as that in Example 3, but excluding SL PRS transmission information.

[0316] For example, the UE indicates that the SL PRS and COT shared information are sent by sending SCI format 2-G. The SCI format 2-G includes the following exemplary information fields:

[0317] 1.SL PRS Resource ID- bits, where N SL-PRS Indicates the number of SL PRS resources configured / pre-configured in a time slot in the shared resource pool for SL PRS and SL communication.

[0318] 2. SL PRS request - 1 bit, used to trigger the receiving UE to send SL PRS.

[0319] 3. Embedded SCI format - 1 bit or 2 bits, indicating the format of the embedded SCI, as shown in Table 10.

[0320] 4. Embedded SCI Payload - Information contained in the second-level SCI indicated by the "Embedded SCI Format" field.

[0321] Table 10 Correspondence between the value of the embedded SCI format field and the embedded SCI payload

[0322] The sideline communication method of the embodiment of the present application is a method for instructing SL PRS and COT to share information. Through the method of the embodiment of the present application, the complexity of UE sending and receiving sideline control information can be reduced.

[0323] The above examples only include several implementation schemes. Other extended schemes may also be used to instruct SL PRS and COT to share information. Examples are as follows.

[0324] First extended solution: COT shared information is sent via SCI format 2-C. The resource pool configuration ensures that SCI format 2-C can carry COT shared information and SCI format 2-B. The following situations can be included when indicating SL PRS transmission:

[0325] 1. Only SL PRS is sent via SCI format 2-D, and SL PRS is not sent in the same time slot as COT shared information; or

[0326] 2. When only SL PRS is sent, SCI format 2-D is used. When SL PRS and COT are sent simultaneously in a shared time slot, SCI format 2-E is used, where SCI format 2-E includes SL PRS indication information and SCI format 2-C.

[0327] Second extension solution: Based on Example 3, a new second-order SCI format can be defined, such as SCI format 2-G. SCI format 2-G includes the SL PRS transmission information field, the COT shared information field, and the information in SCI format 2-C.

[0328] Figure 11 is a schematic block diagram of a first terminal 1100 according to an embodiment of the present application. The first terminal 1100 may include: a sending unit 1101, configured to send first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0329] In one implementation, the first control information is the second-order SCI, and whether the second-order SCI includes the SL PRS sending information and / or the COT sharing information is indicated by the first-order SCI.

[0330] In one embodiment, the first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

[0331] In one implementation, the first information field is a COT shared information indication field.

[0332] In one embodiment, the COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

[0333] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes the COT shared information field.

[0334] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

[0335] In one embodiment, the first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario, and the fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

[0336] In one embodiment, the second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

[0337] In one embodiment, the unlicensed spectrum scenario includes a first SCI of SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SL BWP is configured with parameters indicating PSCCH and PSSCH structures.

[0338] In one embodiment, the first-order SCI includes a third information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information.

[0339] In one embodiment, the third information field is an additional format field.

[0340] In one embodiment, the first-level SCI includes a fourth information field, and the fourth information field, in conjunction with the second-level SCI format field, indicates that the second-level SCI format includes a fourth format and a fifth format.

[0341] In one embodiment, the fourth information field is an additional format field.

[0342] In one embodiment, the fourth format includes the SL PRS sending information, the COT sharing information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT sharing information, and the information in the third format.

[0343] In one embodiment, the first-order SCI includes a fifth information field, and the fifth information field, in conjunction with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI formats include a fourth format, a fifth format, and a sixth format.

[0344] In one embodiment, the fifth information field is an additional format field.

[0345] In one embodiment, the embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format.

[0346] In one implementation, the sixth format also includes the SL PRS sending information.

[0347] In one embodiment, the first format comprises SCI format 2-D.

[0348] In one embodiment, the second format includes SCI format 2-A, and the second format includes SCI format 2-B.

[0349] In one embodiment, the fourth format comprises SCI format 2-E.

[0350] In one embodiment, the fifth format comprises SCI format 2-F.

[0351] In one embodiment, the sixth format comprises SCI format 2-G.

[0352] In one embodiment, the first-level SCI format includes SCI format 1-A.

[0353] In one embodiment, the second-level SCI format includes at least one of the following information:

[0354] Embedded in SCI format;

[0355] Embed SCI payload.

[0356] In one embodiment, the SL PRS sending information includes at least one of the following:

[0357] SL PRS resource identifier;

[0358] SL PRS Request.

[0359] In one embodiment, the COT shared information includes at least one of the following:

[0360] Channel access priority;

[0361] Unicast, multicast or broadcast indication;

[0362] COT shared identification information;

[0363] The remaining COT time length.

[0364] The first terminal 1100 of the embodiment of the present application can implement the corresponding functions of the first terminal in the aforementioned method embodiment. The processes, functions, implementation methods and beneficial effects corresponding to the various modules (sub-modules, units or components, etc.) in the first terminal 1100 can be found in the corresponding descriptions in the above-mentioned method embodiments and will not be repeated here. It should be noted that the functions described in the various modules (sub-modules, units or components, etc.) in the first terminal 1100 of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.) or by the same module (sub-module, unit or component, etc.).

[0365] FIG12 is a schematic block diagram of a second terminal 1200 according to an embodiment of the present application. The first terminal 1200 may include:

[0366] The receiving unit 1201 is configured to receive first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0367] In one implementation, the first control information is the second-order SCI, and whether the second-order SCI includes the SL PRS sending information and / or the COT sharing information is indicated by the first-order SCI.

[0368] In one embodiment, the first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

[0369] In one implementation, the first information field is a COT shared information indication field.

[0370] In one embodiment, the COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

[0371] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes the COT shared information field.

[0372] In one embodiment, the COT shared information indication field and the second-order SCI format field jointly indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

[0373] In one embodiment, the first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario, and the fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

[0374] In one embodiment, the second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

[0375] In one embodiment, the unlicensed spectrum scenario includes a first SCI of SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SL BWP is configured with parameters indicating PSCCH and PSSCH structures.

[0376] In one embodiment, the first-order SCI includes a third information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information.

[0377] In one embodiment, the third information field is an additional format field.

[0378] In one embodiment, the first-level SCI includes a fourth information field, and the fourth information field, in conjunction with the second-level SCI format field, indicates that the second-level SCI format includes a fourth format and a fifth format.

[0379] In one embodiment, the fourth information field is an additional format field.

[0380] In one embodiment, the fourth format includes the SL PRS sending information, the COT sharing information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT sharing information, and the information in the third format.

[0381] In one embodiment, the first-order SCI includes a fifth information field, and the fifth information field, in conjunction with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI formats include a fourth format, a fifth format, and a sixth format.

[0382] In one embodiment, the fifth information field is an additional format field.

[0383] In one embodiment, the embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format.

[0384] In one implementation, the sixth format also includes the SL PRS sending information.

[0385] In one embodiment, the first format comprises SCI format 2-D.

[0386] In one embodiment, the second format includes SCI format 2-A, and the second format includes SCI format 2-B.

[0387] In one embodiment, the fourth format comprises SCI format 2-E.

[0388] In one embodiment, the fifth format comprises SCI format 2-F.

[0389] In one embodiment, the sixth format comprises SCI format 2-G.

[0390] In one embodiment, the first-level SCI format includes SCI format 1-A.

[0391] In one embodiment, the second-level SCI format includes at least one of the following information:

[0392] Embedded in SCI format;

[0393] Embed SCI payload.

[0394] In one embodiment, the SL PRS sending information includes at least one of the following:

[0395] SL PRS resource identifier;

[0396] SL PRS Request.

[0397] In one embodiment, the COT shared information includes at least one of the following:

[0398] Channel access priority;

[0399] Unicast, multicast or broadcast indication;

[0400] COT shared identification information;

[0401] The remaining COT time length.

[0402] The second terminal 1200 of the embodiment of the present application can implement the corresponding functions of the second terminal in the aforementioned method embodiment. The processes, functions, implementation methods and beneficial effects corresponding to each module (sub-module, unit or component, etc.) in the second terminal 1200 can be found in the corresponding description in the above method embodiment, and will not be repeated here. It should be noted that the functions described in each module (sub-module, unit or component, etc.) in the second terminal 1200 of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.) or by the same module (sub-module, unit or component, etc.).

[0403] Figure 13 is a schematic structural diagram of a communication device 1300 according to an embodiment of the present application. The communication device 1300 includes a processor 1310, which can call and execute a computer program from a memory to enable the communication device 1300 to implement the method in the embodiment of the present application.

[0404] In one embodiment, the communication device 1300 may further include a memory 1320. The processor 1310 may call and execute a computer program from the memory 1320 to enable the communication device 1300 to implement the method in the embodiment of the present application.

[0405] The memory 1320 may be a separate device independent of the processor 1310 , or may be integrated into the processor 1310 .

[0406] In one embodiment, the communication device 1300 may further include a transceiver 1330 , and the processor 1310 may control the transceiver 1330 to communicate with other devices. Specifically, the transceiver 1330 may send information or data to other devices, or receive information or data sent by other devices.

[0407] The transceiver 1330 may include a transmitter and a receiver. The transceiver 1330 may further include an antenna, and the number of antennas may be one or more.

[0408] In one embodiment, the communication device 1300 may be the first terminal of the embodiment of the present application, and the communication device 1300 may implement the corresponding processes implemented by the first terminal in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0409] In one embodiment, the communication device 1300 may be the second terminal of the embodiment of the present application, and the communication device 1300 may implement the corresponding processes implemented by the second terminal in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0410] 14 is a schematic structural diagram of a chip 1400 according to an embodiment of the present application. The chip 1400 includes a processor 1410, which can call and execute a computer program from a memory to implement the method according to the embodiment of the present application.

[0411] In one embodiment, the chip 1400 may further include a memory 1420. The processor 1410 may call and execute a computer program from the memory 1420 to implement the method executed by the first terminal or the second terminal in the embodiment of the present application.

[0412] The memory 1420 may be a separate device independent of the processor 1410 , or may be integrated into the processor 1410 .

[0413] In one embodiment, the chip 1400 may further include an input interface 1430. The processor 1410 may control the input interface 1430 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0414] In one embodiment, the chip 1400 may further include an output interface 1440. The processor 1410 may control the output interface 1440 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0415] In one embodiment, the chip can be applied to the first terminal in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the first terminal in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0416] In one embodiment, the chip can be applied to the second terminal in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the second terminal in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0417] The chip used in the first terminal and the second terminal may be the same chip or different chips.

[0418] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0419] The processor mentioned above may be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. The general-purpose processor mentioned above may be a microprocessor or any conventional processor, etc.

[0420] The memory mentioned above may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM).

[0421] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0422] FIG15 is a schematic block diagram of a communication system 1500 according to an embodiment of the present application. The communication system 1500 includes a first terminal 1510 and a second terminal 1520 .

[0423] The first terminal 1510 is configured to send first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0424] The second terminal 1520 is configured to receive first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

[0425] The first terminal 1510 can be used to implement the corresponding functions implemented by the first terminal in the above method, and the second terminal 1520 can be used to implement the corresponding functions implemented by the second terminal in the above method. For the sake of brevity, they are not described here in detail.

[0426] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function in accordance with the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0427] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0428] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0429] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A sideline communication method, comprising: The first terminal sends first control information, where the first control information includes sideline positioning reference signal SL PRS sending information and / or channel occupancy time COT sharing information.

2. The method according to claim 1, wherein: The first control information is the second-order SCI, and whether the second-order SCI includes SL PRS sending information and / or COT sharing information is indicated by the first-order SCI.

3. The method according to claim 2, wherein: The first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

4. The method according to claim 3, wherein: The first information field is a COT shared information indication field.

5. The method according to claim 3, wherein: The COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

6. The method according to claim 5, wherein: The COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes a COT shared information field.

7. The method according to claim 5, wherein: The COT shared information indication field is combined with the second-order SCI format field to indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

8. The method according to claim 2, wherein: The first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario. The fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

9. The method according to claim 8, wherein: The second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

10. The method according to claim 8 or 9, wherein: The unlicensed spectrum scenario includes a first SCI in SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SL bandwidth part BWP is configured with parameters indicating the physical side control channel PSCCH and the physical side shared channel PSSCH structure.

11. The method according to claim 2, wherein: The first-order SCI includes a third information field, and the third information field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information.

12. The method according to claim 11, wherein: The third information field is an additional format field.

13. The method according to claim 2, wherein: The first-level SCI includes a fourth information field, and the fourth information field and the second-level SCI format field jointly indicate that the second-level SCI format includes a fourth format and a fifth format.

14. The method according to claim 13, wherein: The fourth information field is an additional format field.

15. The method according to claim 13 or 14, wherein: The fourth format includes the SL PRS sending information, the COT shared information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT shared information, and the information in the third format.

16. The method according to claim 2, wherein: The first-level SCI includes a fifth information field, and the fifth information field, in conjunction with the second-level SCI format field in the first-level SCI, indicates that the second-level SCI format includes a fourth format, a fifth format, and a sixth format.

17. The method according to claim 16, wherein: The fifth information field is an additional format field.

18. The method according to claim 17, wherein: The embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format.

19. The method according to claim 18, wherein: The sixth format also includes the SL PRS sending information.

20. The method of claim 5, 6, 7 or 9, wherein: The first format comprises SCI format 2-D.

21. The method of claim 7, 8, 15 or 19, wherein: The second format includes SCI format 2-A, and the second format includes SCI format 2-B.

22. The method according to any one of claims 8 to 19, wherein: The fourth format includes SCI format 2-E.

23. The method according to any one of claims 13 to 19, wherein: The fifth format includes SCI format 2-F.

24. The method according to any one of claims 16 to 19, wherein: The sixth format includes SCI format 2-G.

25. The method according to any one of claims 1 to 24, wherein: The first-order SCI formats include SCI format 1-A.

26. The method according to any one of claims 5 to 25, wherein: The second-level SCI format includes at least one of the following information: Embedded in SCI format; Embed SCI payload.

27. The method according to any one of claims 1 to 26, wherein: The SL PRS sending information includes at least one of the following: SL PRS resource identifier; SL PRS Request.

28. The method according to any one of claims 1 to 27, wherein: The COT shared information includes at least one of the following: Channel access priority; Unicast, multicast or broadcast indication; COT shared identification information; The remaining COT time length.

29. A sideline communication method, comprising: The second terminal receives first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

30. The method of claim 29, wherein: The first control information is the second-order SCI, and whether the second-order SCI includes SL PRS sending information and / or COT sharing information is indicated by the first-order SCI.

31. The method according to claim 30, wherein: The first-order SCI includes a first information field, and the first information field is used to indicate whether the second-order SCI scheduled by the first-order SCI includes COT sharing information.

32. The method according to claim 31, wherein: The first information field is a COT shared information indication field.

33. The method according to claim 31, wherein: The COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a first format including SL PRS sending information and whether the first format includes COT shared information.

34. The method of claim 33, wherein: The COT shared information indication field and the second-order SCI format field jointly indicate whether the first format includes a COT shared information field.

35. The method of claim 33, wherein: The COT shared information indication field is combined with the second-order SCI format field to indicate whether the second format or the third format embedded in the SCI format field of the first format includes COT shared information.

36. The method of claim 30, wherein: The first-order SCI includes a second information field, and the second information field is used to indicate that the second-order SCI format is a fourth format in an unlicensed spectrum scenario. The fourth format includes the SL PRS sending information and the COT sharing information, and the fourth format also includes information in the second format or the third format.

37. The method of claim 36, wherein: The second information field is used to indicate that the second-order SCI format scheduled by the first-order SCI in the authorized spectrum scenario is a first format, and the first format includes the SL PRS sending information.

38. The method according to claim 36 or 37, wherein: The unlicensed spectrum scenario includes a first SCI of SCI format 1-A sent within a resource pool, the current operation is accompanied by shared spectrum channel access, or the current SLBWP is configured with parameters indicating PSCCH and PSSCH structures.

39. The method of claim 30, wherein: The first-order SCI includes a third information field, and the third information field and the second-order SCI format field in the first-order SCI jointly indicate that the second-order SCI format is a fourth format, and the fourth format includes the SL PRS sending information and the COT sharing information.

40. The method of claim 39, wherein: The third information field is an additional format field.

41. The method of claim 30, wherein: The first-level SCI includes a fourth information field, and the fourth information field and the second-level SCI format field jointly indicate that the second-level SCI format includes a fourth format and a fifth format.

42. The method according to claim 41, wherein: The fourth information field is an additional format field.

43. The method according to claim 41 or 42, wherein: The fourth format includes the SL PRS sending information, the COT shared information, and the information in the second format, and the fifth format includes the SL PRS sending information, the COT shared information, and the information in the third format.

44. The method of claim 30, wherein: The first-level SCI includes a fifth information field, and the fifth information field, in conjunction with the second-level SCI format field in the first-level SCI, indicates that the second-level SCI format includes a fourth format, a fifth format, and a sixth format.

45. The method of claim 44, wherein: The fifth information field is an additional format field.

46. ​​The method of claim 45, wherein: The embedded SCI format field in the sixth format is used to indicate the fourth format or the fifth format, the fourth format includes COT shared information and information in the second format, and the fifth format includes COT shared information and information in the third format.

47. The method of claim 46, wherein: The sixth format also includes the SL PRS sending information.

48. The method of claim 33, 34, 35 or 37, wherein: The first format comprises SCI format 2-D.

49. The method of claim 35, 36, 43 or 47, wherein: The second format includes SCI format 2-A, and the second format includes SCI format 2-B.

50. The method according to any one of claims 36 to 47, wherein: The fourth format includes SCI format 2-E.

51. The method according to any one of claims 41 to 47, wherein: The fifth format includes SCI format 2-F.

52. The method according to any one of claims 44 to 47, wherein: The sixth format includes SCI format 2-G.

53. A method according to any one of claims 29 to 52, wherein: The first-order SCI formats include SCI format 1-A.

54. A method according to any one of claims 33 to 53, wherein: The second-level SCI format includes at least one of the following information: Embedded in SCI format; Embed SCI payload.

55. A method according to any one of claims 29 to 54, wherein: The SL PRS sending information includes at least one of the following: SL PRS resource identifier; SL PRS Request.

56. A method according to any one of claims 29 to 55, wherein: The COT shared information includes at least one of the following: Channel access priority; Unicast, multicast or broadcast indication; COT shared identification information; The remaining COT time length.

57. A first terminal, comprising: The sending unit is used to send first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

58. A second terminal, comprising: The receiving unit is used to receive first control information, where the first control information includes SL PRS sending information and / or COT sharing information.

59. A terminal device, comprising: A transceiver, a processor and a memory, wherein the memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and run the computer program stored in the memory so that the terminal device executes the method as described in any one of claims 1 to 56.

60. A chip, comprising: A processor, configured to call and run a computer program from a memory so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 56.

61. A computer-readable storage medium for storing a computer program, which, when executed by a device, causes the device to perform the method according to any one of claims 1 to 56.

62. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 56.

63. A computer program causing a computer to execute the method of any one of claims 1 to 56.

64. A communication system comprising: A first terminal, configured to execute the method according to any one of claims 1 to 28; The second terminal is used to execute the method as claimed in any one of claims 29 to 56.

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