Sidelink communication method, and terminal

Abstract

The present application relates to a sidelink communication method and a terminal. The method comprises: a first terminal sending first control information, wherein the first control information comprises sidelink positioning reference signal (SLPRS) sending information and / or channel occupancy time (COT) sharing information. In the embodiments of the present application, the first control information sent by the terminal comprises the SLPRS information and the COT sharing information, such that the complexity of the terminal sending and / or receiving sidelink control information can be reduced.

Description

Side-link communication methods and terminals Technical Field

[0001] This application relates to the field of communications, and more specifically, to a side-by-side communication method and terminal. Background Technology

[0002] To improve positioning accuracy, the 3rd Generation Partnership Project (3GPP) is researching the feasibility and performance of positioning technology based on SideLink Positioning Reference Signal (SL PRS). Furthermore, it supports a Channel Occupancy Time (COT) sharing mechanism in Sidelink Over Unlicensed Spectrum (SL-U) systems. After a terminal initiates a COT via Listen Before Talk (LBT), it can share the COT with other terminals. Other terminals utilize one of the access channels in the Type 2 LBT method, improving resource utilization while also facilitating channel contention among SL-U terminals.

[0003] Summary of the Invention

[0004] This application provides a side-link communication method and terminal, which can reduce the complexity of sending and receiving side-link control information.

[0005] This application provides a side-link communication method, including:

[0006] The first terminal sends first control information, which includes lateral positioning reference signal (SL PRS) transmission information and / or channel occupancy time (COT) sharing information.

[0007] This application provides a side-link communication method, including:

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

[0009] This application provides a first terminal, including:

[0010] The transmitting unit is used to transmit first control information, which includes SL PRS transmission information and / or COT sharing information.

[0011] This application provides a second terminal, including:

[0012] The receiving unit is used to receive first control information, which includes SL PRS transmission information and / or COT sharing information.

[0013] This application provides a terminal device, including a transceiver, a processor, and a memory. The memory stores a computer program, the transceiver communicates with other devices, and the processor calls and runs the computer program stored in the memory to enable the terminal device to perform the aforementioned side-by-side communication method.

[0014] This application provides a chip for implementing the above-described side-to-side communication method. Specifically, the chip includes a processor for retrieving and running a computer program from a memory, causing a device equipped with the chip to execute the above-described side-to-side communication method.

[0015] This application provides a computer-readable storage medium for storing a computer program that, when run by a device, causes the device to perform the aforementioned side-by-side communication method.

[0016] This application provides a computer program product, including computer program instructions that cause a computer to execute the above-described side-by-side communication method.

[0017] This application provides a computer program that, when run on a computer, causes the computer to perform the above-described side-by-side communication method.

[0018] In this embodiment, 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 side-by-side control information. Attached Figure Description

[0019] Figure 1 is a schematic diagram of time slot symbols used for SL transmission according to this application.

[0020] Figure 2 is a schematic diagram of the PSCCH and PSSCH time slot structures according to this application.

[0021] Figure 3 is a schematic diagram of the time-domain location of the PSSCH DMRS symbol according to this application.

[0022] Figure 4 is a schematic diagram of the frequency domain location of the PSSCH DMRS symbol according to this application.

[0023] Figure 5 is a schematic diagram of the PSSCH resource pool according to this application.

[0024] Figure 6 is a schematic diagram of the time slot structure of the NR system according to this application.

[0025] Figure 7 is a schematic diagram of interleaved resource blocks according to this application.

[0026] Figure 8 is a schematic diagram of the RB set according to this application.

[0027] Figure 9 is a schematic flowchart of a side-to-side communication method according to an embodiment of this application.

[0028] Figure 10 is a schematic flowchart of a side-to-side communication method according to an embodiment of this application.

[0029] Figure 11 is a schematic block diagram of a first terminal according to an embodiment of the present application.

[0030] Figure 12 is a schematic block diagram of a second terminal according to an embodiment of the present application.

[0031] Figure 13 is a schematic block diagram of a communication device according to an embodiment of this application.

[0032] Figure 14 is a schematic block diagram of a chip according to an embodiment of this application.

[0033] Figure 15 is a schematic block diagram of a communication system according to an embodiment of this application. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

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

[0036] Traditional communication systems typically 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 communication but also, 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. The embodiments of this application can also be applied to these communication systems.

[0037] In one implementation, the communication system in this application embodiment can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) network deployment scenario.

[0038] In one embodiment, the communication system in this application can be applied to unlicensed spectrum, wherein the unlicensed spectrum can also be considered as shared spectrum; or, the communication system in this application can also be applied to licensed spectrum, wherein the licensed spectrum can also be considered as non-shared spectrum.

[0039] This application describes various embodiments in conjunction with network devices and terminal devices. 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] Terminal devices can be stations (STAION, ST) in WLANs, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in next-generation communication systems such as NR networks, or terminal devices in future evolved Public Land Mobile Network (PLMN) networks, etc.

[0041] In the embodiments of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships); and it can also be deployed in the air (such as airplanes, balloons and satellites).

[0042] In the embodiments of this application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver capabilities, 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 care, 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] By way of example and not limitation, in this embodiment, the terminal device can also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are feature-rich, large in size, and can achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those that focus on a specific type of application function and require the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0044] In the embodiments of this application, the network device can be a device for communicating with mobile devices, such as an access point (AP) in a WLAN, an evolved Node B (eNB or eNodeB) in LTE, a relay station or access point, or a vehicle-mounted device, a wearable device, a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or an NTN network, etc.

[0045] By way of example and not limitation, in this embodiment, the network device may have mobility characteristics; for example, the network device may be a mobile device. Optionally, 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 located on land, water, or other similar locations.

[0046] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area 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 in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0049] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

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

[0051] I. Time Slot 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 2 or 3 time-domain symbols. NR-V2X time-domain resource allocation is granular, with time slots as the allocation unit. The start and length of the time-domain symbols used for sidelink transmission in a time slot are configured using the parameters start symbol position (sl-startSLsymbols) and number of symbols (sl-lengthSLsymbols). The last symbol in this set is used as the guard period (GP), and the PSSCH and PSCCH can only use the remaining time-domain symbols. However, if a time slot is configured with Physical Sidelink Feedback Channel (PSFCH) transmission resources, the PSSCH and PSCCH cannot occupy the time-domain symbols used for PSFCH transmission, as well as the Automatic Gain Control (AGC) and GP symbols preceding that symbol.

[0053] As shown in Figure 1, the network configuration is sl-StartSymbol=3, sl-Len gthSymbols=11, meaning that 11 time-domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. This time slot contains PSFCH transmission resources, which occupy symbols 11 and 12. Symbol 11 is used as the AGC symbol for 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. Symbol 3 is usually used as the AGC symbol.

[0054] In NR-V2X, a sideline time slot may contain PSCCH, PSSCH, and possibly PSFCH. Within a time slot, the first Orthogonal Frequency Division Multiplexing (OFDM) symbol is fixed for Automatic Gain Control (AGC). On the AGC symbol, the UE replicates the information transmitted on the second symbol. The last symbol of the time slot is reserved for transmit / receive switching, allowing the UE to transition from transmit (or receive) to receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sideline symbol. In the frequency domain, the number of Physical Resource Blocks (PRBs) occupied by PSCCH is within a subband of one PSSCH. If the number of PRBs occupied by PSCCH is less than the size of one subchannel of PSSCH, or if the frequency domain resources of PSSCH include multiple subchannels, then PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol containing PSCCH.

[0055] The PSSCH is used to carry second-order sidelink control information (SCI) and sidelink-shared channel (SL-SCH). The 3GPP (3rd Generation Partnership Project) defines two second-order SCI formats: SCI format 2-A and SCI format 2-B. SCI format 2-B is suitable for multicast communication methods that use distance-based Hybrid Automatic Repeat reQuest (HARQ) feedback. SCI format 2-A is suitable for other scenarios, such as unicast, multicast, and broadcast communication methods that do not require sidelink HARQ feedback, unicast communication methods that require sidelink HARQ feedback, and multicast communication methods that require ACK (acknowledgment) or NACK (negative ACK) feedback. 3GPP has also introduced an additional second-order SCI format, SCI format 2-C, used to indicate reference resource sets and trigger signaling in specific situations. The modulation symbols of the second-order SCI begin mapping from the symbol containing the first PSSCH modulation / demodulation reference signal, using a frequency-domain-first, time-domain-later approach. On this symbol, they are multiplexed with the resource elements (REs) of the demodulation reference symbol (DMRS) through interleaving. Furthermore, the modulation symbols of the second-order SCI cannot be mapped to the REs containing the phase-tracking reference signals (PT-RS), as shown in Figure 2.

[0056] In side-channel communication systems, whether the UE autonomously selects resources or determines transmission resources based on network-based side-channel resource scheduling, different UEs may transmit PSCCH on the same time-frequency resources. To ensure that the receiver can detect at least one PSCCH in the event of PSCCH resource conflicts, LTE-V2X employs a PSCCH DMRS randomization design. Specifically, when transmitting a PSCCH, the UE can randomly select a value from {0, 3, 6, 9} as the cyclic shift for the DMRS. If multiple UEs transmit PSCCH DMRS on the same time-frequency resources using different cyclic shifts, the receiving UE can still detect at least one PSCCH through orthogonal DMRS. For the same purpose, NR-V2X introduces three PSCCH DMRS frequency domain orthogonal covering codes (OCCs) for the transmitting UE to randomly select, as shown in Table 1. The i-th bit of the OCC mask is applied to the i-th DMRS RE within the Resource Block (RB), thereby achieving the effect of distinguishing different UEs.

[0057] Table 1 OCC Mask for PSCCH DMRS

[0058] The DMRS of PSSCH in NR-V2X borrows from the design of the NR Uu interface, employing 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. Table 2 shows the available DMRS patterns and the position of each DMRS symbol within a pattern for a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols. Figure 3 shows a schematic diagram of the time-domain positions of the four DMRS symbols when the PSSCH has 13 symbols.

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

[0060] If multiple time-domain DMRS patterns are configured within the resource pool, the specific time-domain DMRS pattern used is selected by the transmitting UE and indicated in the first-order SCI. This design allows high-speed moving UEs to select high-density DMRS patterns, thereby ensuring the accuracy of channel estimation. For low-speed moving UEs, low-density DMRS patterns can be used, thereby improving spectral efficiency.

[0061] The generation method of PSSCH DMRS sequences is almost identical to that of PSCCH DMRS sequences, the difference being the initialization formula of the pseudo-random sequence c(m). 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: DMRS frequency domain type 1 and DMRS frequency domain type 2. Furthermore, each frequency domain type has two different variations: single-symbol DMRS and dual-symbol DMRS. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, while single-symbol DMRS frequency domain type 2 supports 6 DMRS ports. In the dual-symbol case, the number of supported ports doubles. However, in NR-V2X, since the PSSCH only needs to support a maximum of two DMRS ports, only single-symbol DMRS frequency domain type 1 is supported, as shown in Figure 4.

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

[0064] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are also contiguous, and the allocation granularity of frequency domain resources is also sub-channel. A sub-channel includes {10, 12, 15, 20, 50, 75, 100} PRBs, with the smallest sub-channel size being 10 PRBs, significantly larger than the smallest sub-channel size of 4 PRBs in LTE-V2X. This is primarily because in NR-V2X, the frequency domain resources of the PSCCH are located within the first sub-channel of its associated PSSCH, and the frequency domain resources of the PSCCH are less than or equal to the size of a PSSCH sub-channel, while the time domain resources of the PSCCH occupy 2 or 3 OFDM symbols. If the sub-channel size is configured too small, it will result in very few available PSCCH resources, increased code rate, and reduced PSCCH detection performance. In NR-V2X, the size of the PSSCH sub-channel is configured independently of the PSCCH frequency domain resource size, but it must be ensured that the PSCCH frequency domain resource is less than or equal to the PSSCH sub-channel 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, as shown in the example below:

[0065] (1) Subchannel Size (sl-Subchannel Size): Indicates the number of consecutive PRBs included in a subchannel in the resource pool, with a value range of {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 starting 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 Indicator (sl-FreqResource PSCCH): Indicates the frequency domain resource size of PSCCH, with a value range of {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 from the PRB indicated by sl-Start RB-Subchannel. If the final number of PRBs included in the 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 start positions of the PSCCH and the first sub-channel of its associated PSSCH are aligned. Therefore, the start position of each PSSCH sub-channel is also the possible frequency domain start position of the PSCCH. Based on the parameters above, the frequency domain range of the PSCCH and PSSCH resource pool can be determined, as shown in Figure 5.

[0072] In NR-V2X, the PSCCH is used to carry side-channel control information related to resource snooping, 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 PSSCH in the current time slot of PSCCH scheduling, as well as the number of frequency domain resources and starting position of the maximum two retransmission resources reserved;

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

[0076] (4) Reference signal pattern for PSSCH;

[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 indication;

[0082] (10) Number of PSFCH symbols;

[0083] (11) Resource reservation period: Reserved resources for transmission of another Transport Block (TB) in the next period. This information bit field does not exist if inter-TB resource reservation is not activated in the resource pool configuration.

[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 sub-channel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the starting position of the time-frequency domain of the scheduled PSSCH.

[0086] III. Determination of Time-Domain Resources (Time Slots) in NR SL

[0087] In NR-V2X, PSCCH / PSSCH transmission is based on the time slot level, meaning only one PSCCH / PSSCH can be transmitted per time slot. Transmitting multiple PSCCH / PSSCH within a single time slot via Time Division Multiplexing (TDM) is not supported. PSCCH / PSSCH between different users can be multiplexed within a time slot via Frequency Division Multiplexing (FDM). While PSSCH time-domain resources in NR-V2X are granular at the time slot level, unlike LTE-V2X where the PSSCH occupies all time-domain symbols in a subframe, in NR-V2X, the PSSCH can occupy only a portion of the symbols in a time slot. This is primarily because in LTE systems, uplink and downlink transmissions are also granular at the subframe level, and therefore side-link transmissions are also granular at the subframe level (except for special subframes in Time Division Duplex (TDD) systems, which are not used for side-link transmission). In NR systems, a flexible time-slot structure is employed, where a single time slot includes both uplink and downlink symbols. This allows for more flexible scheduling and reduces latency. A subframe of an NR system is shown in Figure 6. A time slot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols are located at the beginning of the time slot, uplink symbols at the end, and flexible symbols lie between them. The number of each type of symbol in each time slot is configurable.

[0088] Sidelink transmission systems can share carriers with cellular systems, in which case sidelink transmission can only utilize the uplink transmission resources of the cellular system. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a time slot, the network needs to configure a time slot with all uplink symbols for sidelink transmission. This would significantly impact the uplink and downlink data transmission of the NR system, reducing system performance. Therefore, NR-V2X supports using a portion of the time-domain symbols in a time slot for sidelink transmission; that is, a portion of the uplink symbols in a time slot 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 the AGC and GP symbols leaves even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, the minimum number of time-domain symbols occupied by sidelink transmission in NR-V2X is 7 (including the GP symbol). 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 time slot can be configured for sidelink transmission.

[0089] In NR-V2X systems, the time-domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in NR systems, the length of the bitmap has been extended, supporting a bitmap length range of [10:160]. The method for determining the time slot location belonging to the resource pool within a System Frame Number (SFN) period using the bitmap is the same as in LTE-V2X, but there are 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 timeslot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then that timeslot cannot be used for sideline transmission. Here, Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0092] Specifically, the following steps are included:

[0093] Step 1: Within the SFN period, remove time slots that do not belong to the resource pool, 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 these remaining time slots are renumbered.

[0094] Where: N S_SSB This indicates the number of synchronization slots within an SFN period. The synchronization slots are determined based on synchronization-related configuration parameters, and are related to the period of the Synchronization Signal Block (SSB) and the number of SSB transmission resources configured within the period.

[0095] N nonSL This indicates the number of time slots that do not conform to the uplink symbol start and number configuration within an SFN period: 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 sideline transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

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

[0097] If the number of time slots in the remaining time slot set is not divisible by the bitmap length, it is necessary to determine the number of reserved time slots and their corresponding time domain locations. Specifically, if a time slot lr (0 ≤ r < 10240 × 2) μ -N S_SSB -N nonSL If the following conditions are met, then the time slot is a reserved time slot.

[0098] Where: N reserved =(10240×2) μ -N S_SSB -N nonSL )mod L bitmap , indicating the number of reserved time slots, L bitmap This represents 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 the logical time slot set. All time slots in this set are available for use in the resource pool. Renumber the time slots in the logical time slot set. Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0100] Step 4: Determine the time slots belonging to the resource pool in the logical time slot set based on the bit map.

[0101] The bitmap in the resource pool configuration information is as follows For time slots in the logical time slot set (0≤k<(10240×2 μ -N S_SSB -N nonSL -N reserved When b is satisfied k′ When = 1, this time slot belongs to the resource pool.

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

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

[0104] In NR SL, 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, and the information it contains is shown in the following example:

[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 transport resource and a reserved resource for retransmission of the current transport block (TB), then the FRIV is... Bits are used to indicate the initial subchannel index of the reserved resource, the current transmission resource, and the number of subchannels contained in the reserved resource.

[0108] If an SCI can indicate the current transport resources and two reserved resources for the current TB retransmission, then the FRIV is: Bits are used to indicate the initial subchannel index of the two reserved resources, the current transmission resources, and the number of subchannels contained in the two reserved resources. This represents 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 transport resource and a reserved resource for the current TB retransmission, then TRIV is 5 bits, used to indicate the slot interval of the reserved resource relative to the current transport resource.

[0111] If a PSCCH can indicate the current transport resource and two other reserved resources for the current TB retransmission, then TRIV is 9 bits, used to indicate the slot interval between the two reserved resources relative to the current transport resource, which is represented by the number of slots belonging to the current resource pool.

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

[0113] 5. Second-order 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 in the RRC layer, respectively.

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

[0116] 8. Modulation and coding mechanism (MCS): 5 bits.

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

[0118] 10. Number of PSFCH symbols: 1 bit if the PSFCH period is 2 or 4 slots, otherwise 0 bits.

[0119] 11. Resource Reservation Period: 4 bits; Reserved for resources to be sent by another TB in the next period. This information bit field does not exist if inter-TB resource reservation is not activated in the resource pool configuration.

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

[0121] NR SL defines four second-order SCI formats: 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 Indicator - 2 bits; 00 indicates broadcast, 01 indicates multicast communication requiring ACK or NACK feedback, 10 indicates unicast, and 11 indicates multicast communication requiring only NACK feedback.

[0130] CSI Feedback Request - 1 bit.

[0131] For example, SCI format 2-B is 48 bits long and is used only to indicate multicast service transmission. Therefore, compared with SCI format 2-A, SCI format 2-B does not contain the unicast / multicast / broadcast indication field and the CSI feedback request field, but it additionally contains 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 inter-UE coordination requests or inter-UE coordination information, indicating that the information contained is divided into two parts. The first part consists of the bit fields in SCI format 2-A other than the "unicast / multicast / broadcast indication" field.

[0135] If the SCI format 2-C carries an inter-UE coordination request, then 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 This represents the number of sub-channels currently in the resource pool.

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

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

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

[0142] 6. Resource type: If the current resource pool is configured to have the resource type determined by UE-B, then it is 1 bit; otherwise, it is 0 bits.

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

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

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

[0146] If periodic resource reservation is allowed in the current resource pool, then it is A bit, or vice versa, is 0 bits;

[0147] 3. The 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+ Bits used to indicate the DFN and slot index of the reference slot, μ = 0, 1, 2, 3 are the subcarrier spacing index;

[0149] 5. First resource frequency domain location - Bits are used to indicate the frequency domain start position of the first resource in the first TRIV and the second TRIV.

[0150] For example, SCI format 2-D is used to instruct SL PRS to send data, specifically including the following information:

[0151] SL PRS Resource ID- bits, where N SL-PRS This indicates the number of SL PRS resources configured / pre-configured in a time slot within 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-order SCI indicated by the "Embedded SCI Format" field.

[0155] Table 3. Correspondence between the values ​​of the embedded SCI format field and the embedded SCI payload.

[0156] V. Side-line transmission (SL-U) on unlicensed spectrum

[0157] When performing sideline transmission (SL-U) on unlicensed spectrum, sideline transmission must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD) requirements. Regarding the OCB requirement, when the UE uses the channel for data transmission, the occupied channel bandwidth must be no less than 80% of the channel bandwidth. Regarding the maximum power spectral density requirement, the power transmitted by the UE per 1 MHz cannot exceed 10 dBm. To meet the OCB and PSD regulatory requirements, sideline transmission on unlicensed spectrum requires an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, with a total of M IRBs within the frequency band. The m-th IRB includes RBs {m, M+m, 2M+m, 3M+m, ...}.

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

[0159] On unlicensed spectrum, UEs access the channel through LBT. LBT is granular in the frequency domain in 20MHz increments, and each 20MHz increment 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 NR-U. After a terminal initiates a COT via LBT, it can share the COT with other terminals. Other terminals utilize one of the Type 2 LBT access channels, improving resource utilization and facilitating channel contention among SL-U terminals. To share the COT with other terminals via 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 is used to indicate the channel access priority of the terminal initiating COT.

[0162] Unicast / Multicast / Broadcast Indicator - 2 bits;

[0163] COT Shared ID Information - 24 bits;

[0164] Remaining COT time length - This bit indicates the remaining COT length that can be used after the signaling is received.

[0165] On unlicensed spectrum, the UE needs to perform a Level Bypass (LBT) before it can access the channel. However, the time it takes for the UE to complete the LBT is uncertain. If the UE is restricted to starting transmission from the beginning of a time slot, it may miss its transmission opportunity because it fails to complete the LBT before then. Therefore, in SL-U, we consider adding a transmission starting point within a time slot, i.e., multi-start transmission. For example, the additional starting point could be the 3rd or 4th OFDM symbol within the time slot.

[0166] VI. Localization based on lateral links

[0167] Within 3GPP, the 3GPP Radio Access Network (RAN) has studied "NR Positioning Enhancement" and "Scenarios and Requirements for NR Positioning Use Cases in, Partially Covered, and Out-of-Coverage Areas," with the latter focusing on V2X and public safety use cases. Furthermore, the 3GPP SA1 working group has also developed requirements for "ranging-based services" and established positioning accuracy requirements for IIoT use cases outside of coverage. 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 located outside cellular network coverage, 3GPP completed a feasibility and performance study of positioning technology based on lateral positioning reference signals in the early stages of Rel-18. The next step will be to standardize lateral positioning (including ranging / direction finding) solutions in NR systems, including:

[0169] 1. Standardized SideLink Positioning Reference Signal (SL PRS): SL PRS uses a comb-based frequency domain structure (excluding full RE mapping mode), adopts a sequence format based on pseudo-random sequences, takes the DL-PRS sequence as the design starting point, and supports a maximum SL PRS bandwidth of 100MHz in FR1.

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

[0171] 3. Standardize the SL PRS resource allocation scheme, including Scheme 1 and Scheme 2. Scheme 1 corresponds to network-allocated SL PRS resources, and Scheme 2 corresponds to UE-selected SL PRS resources. Support SL PRS sharing a resource pool with Rel-16 / 17 / 18 sideline communication and a dedicated SL PRS resource pool. For Scheme 2, at least one of the following needs to be studied and standardized: channel-sensing-based resource selection, random resource selection, congestion control, and UE-coordinated resource selection.

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

[0173] As can be seen from the above introduction, NR SL has defined four different second-order SCI formats. In the embodiments of this application, when SL PRS and SL communication 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] Figure 9 is a schematic flowchart of a side-by-side communication method 900 according to an embodiment of this application. The method includes at least a portion of the following.

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

[0176] In this embodiment, if SL PRS and SL communication coexist in a resource pool of unlicensed spectrum (also known as shared spectrum), SL PRS transmission information and COT sharing information can be carried through the first control information. SL PRS transmission information can be abbreviated 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 implementation, the SL PRS transmits information including at least one of the following:

[0178] SL PRS resource identifier;

[0179] SL PRS request.

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

[0181] Channel access priority;

[0182] Unicast, multicast, or broadcast instructions;

[0183] COT shared identification information;

[0184] Remaining COT time length.

[0185] For example, the Channel Access Priority Class (CAPC) can be 2 bits, used to indicate the channel access priority of the terminal initiating COT;

[0186] The unicast / multicast / broadcast indicator can be 2 bits, used to indicate whether the transmission method is unicast, multicast, or broadcast;

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

[0188] The remaining COT time length can be The bit indicates the remaining COT length that can be used after the signaling is received; where μ is the subcarrier spacing index.

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

[0190] In this embodiment, the second-level SCI can carry SL PRS transmission information and COT sharing information. The first SCI sent by the first terminal within a resource pool can indicate whether the second-level SCI scheduled by the first-level SCI includes COT sharing information. The first-level SCI can be SCI format 1-A. The first-level SCI and the second-level SCI can be sent using the same information or different information. For example, the first terminal sends a first-level SCI and first control information to the second terminal, where the first control information includes the second-level SCI, and the second-level SCI includes SL PRS transmission information and / or COT sharing information.

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

[0192] In this embodiment, the first SCI sent by the first terminal within a resource pool may include a first information field. The first information field may include newly added bits in the first SCI, or it may include reserved bits in the first SCI. This first information field can indicate, in unlicensed spectrum scenarios, whether the second-order SCI scheduled by the first-order SCI includes COT shared information.

[0193] In one implementation, the first information field is a COT shared information indication field. The first information field can also have other names, 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 implementation, the COT shared information indication field and the second-order SCI format field in the first-order SCI jointly indicate whether the second-order SCI format is a first format containing SL PRS transmission information and whether the first format includes COT shared information.

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

[0196] Embedded SCI format;

[0197] Embedded SCI payload.

[0198] In this embodiment, 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 formats include SCI format 2-A, SCI format 2-B, SCI format 2-C, and SCI format 2-D. A value of 11 in the second-order SCI format field indicates that the second-order SCI format is SCI format 2-D. In this case, a value of 1 in the COT shared information indication field indicates that SCI format 2-D includes COT shared information; a value of 0 in the COT shared information indication field indicates that SCI format 2-D does not include COT shared information. Alternatively, a value of 0 in the COT shared information indication field indicates that SCI format 2-D includes COT shared information; a value of 1 in the COT shared information indication field indicates that SCI format 2-D does not include COT shared information.

[0199] In one implementation, 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. For example, the value of the second-order SCI format field can 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 can indicate whether SCI format 2-A, SCI format 2-B, SCI format 2-C, or SCI format 2-D includes a COT shared information field.

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

[0201] In one implementation, the first format includes SCI format 2-D.

[0202] In one implementation, 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 can indicate that the first format is SCI format 2-D. The value of the COT shared information indication field can indicate whether SCI format 2-A or SCI format 2-B embedded in the SCI format field of SCI format 2-D includes the COT shared information field.

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

[0205] In this embodiment, the second information field can 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 can indicate different second-order SCI formats in licensed and unlicensed spectrum scenarios. For example, a value of 11 in the second SCI format field indicates a first format, such as SCI format 2-D, in a licensed spectrum scenario, and a newly added fourth format, such as SCI format 2-E, in an unlicensed spectrum scenario. In one example, SCI format 2-E may include SL PRS transmission information and COT sharing information, and SCI format 2-E may also include information from SCI format 2-A or SCI format 2-B. The COT sharing information can be in SCI format 2-A or SCI format 2-B within SCI format 2-E.

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

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

[0208] In one implementation, the first-order SCI format includes SCI format 1-A.

[0209] In one implementation, 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 if the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structures, then the SCI format 1-A may contain a specific bit field, such as a first information field, to indicate whether the second-order SCI scheduled by the SCI format 1-A contains COT shared information.

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

[0212] In one implementation, the first-order SCI includes a third information field. This third information field, 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 transmission 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 a first value, and the value of the second-order SCI format field is a second value, which can jointly indicate that the second-order SCI format is a newly added fourth format, such as SCI format 2-E. Specific examples of the information in SCI format 2-E can be found in the relevant descriptions 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. As another example, the first value can be 11 or 00, and the second value can be 000, 001, 010, 011, etc.

[0213] In one implementation, the third information field is an additional format field. In this embodiment, the additional format field can also be called an additional indication field, 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 a 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 a newly added second SCI format. 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. The third information field can also have other names, as long as it can indicate more second SCI formats; the specific name is not limited.

[0214] In one implementation, the first-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order SCI format includes a fourth format and a fifth format. In this embodiment, the fourth information field and the second-order SCI format field jointly indicate two newly added second-order SCI formats. The fourth information field may include one or more bits. For example, if the fourth indication field has a third value and the second-order SCI format field has a fourth value, they 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. Furthermore, the third value can be 11 or 00, and the fourth value can be 000, 001, 010, 011, etc.

[0215] In one implementation, the fourth information field is an additional format field. For example, an additional format field of 0 and a second-order SCI format field of 00 indicate SCI format 2-A. An additional format field of 1 and a second-order SCI format field of 00 indicate SCI format 2-E. An additional format field of 0 and a second-order SCI format field of 01 indicate SCI format 2-B. An additional format field of 1 and a second-order SCI format field of 01 indicate SCI format 2-F. The fourth information field can also have other names, as long as it can indicate more second SCI formats; the specific name is not limited.

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

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

[0218] In this embodiment, among 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 transmission information and COT sharing information, and may also include information from 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. SCI format 2-E includes the information from SCI format 2-A, SL PRS transmission information, and COT sharing information. SCI format 2-F includes the information from SCI format 2-B, SL PRS transmission information, and COT sharing information.

[0219] In one implementation, the first-order SCI includes a fifth information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format includes a fourth format, a fifth format, and a sixth format.

[0220] In one implementation, 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 this embodiment, three newly added second-order SCI formats are indicated by jointly using a fifth information field and a second-order SCI format field. The fifth information field may include one or more bits. For example, if the fifth indication field has a fifth value and the second-order SCI format field has a sixth value, they can jointly indicate a newly added fourth format (e.g., SCI format 2-E), a fifth format (e.g., SCI format 2-F), and a sixth format (e.g., SCI format 2-G). For example, the fifth value can be 1 or 0, and the sixth value can be 00, 01, 10, 11, etc. Alternatively, the fifth value can be 11 or 00, and the sixth value can be 000, 001, 010, 011, etc.

[0222] In one implementation, the fifth information field is an additional format field. For example, an additional format field of 0 and a second-order SCI format field of 00 indicate SCI format 2-A. An additional format field of 1 and a second-order SCI format field of 00 indicate SCI format 2-E. An additional format field of 0 and a second-order SCI format field of 01 indicate SCI format 2-B. An additional format field of 1 and a second-order SCI format field of 01 indicate SCI format 2-F. An additional format field of 0 and a second-order SCI format field of 10 indicate SCI format 2-C. An additional format field of 1 and a second-order SCI format field of 10 indicate SCI format 2-G. The fifth information field can also have other names, as long as they can indicate more second-order SCI formats; the specific name is not limited.

[0223] In one implementation, the embedded SCI format field in the sixth format is used to indicate the fourth or fifth format. The fourth format includes COT sharing information and information from the second format, and the fifth format includes both COT sharing information and information from the third format. In this embodiment, 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 sharing information and information from 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. SCI format 2-E includes information from SCI format 2-A and COT sharing information. SCI format 2-F includes information from SCI format 2-B and COT sharing information.

[0224] In one implementation, the sixth format further includes the SL PRS transmission information. In embodiments of this application, the fourth and fifth formats may not include the SL PRS transmission information; instead, the SL PRS transmission information may be included in the sixth format, such as SCI format 2-G.

[0225] Figure 10 is a schematic flowchart of a side-by-side communication method 1000 according to an embodiment of this application. The method includes at least a portion of the following.

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

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

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

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

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

[0231] In one implementation, 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.

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

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

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

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

[0236] In one implementation, 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 transmission information and the COT sharing information.

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

[0238] In one implementation, the first-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order SCI format includes a fourth format and a fifth format.

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

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

[0241] In one implementation, the first-order SCI includes a fifth information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format includes a fourth format, a fifth format, and a sixth format.

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

[0243] In one implementation, the embedded SCI format field in the sixth format is used to indicate the fourth or fifth format, wherein 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 transmission information.

[0245] In one implementation, the first format includes SCI format 2-D.

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

[0247] In one implementation, the fourth format includes SCI format 2-E.

[0248] In one implementation, the fifth format includes SCI format 2-F.

[0249] In one implementation, the sixth format includes SCI format 2-G.

[0250] In one implementation, the first-order SCI format includes SCI format 1-A.

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

[0252] Embedded SCI format;

[0253] Embedded SCI payload.

[0254] In one implementation, the SL PRS transmits information including at least one of the following:

[0255] SL PRS resource identifier;

[0256] SL PRS request.

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

[0258] Channel access priority;

[0259] Unicast, multicast, or broadcast instructions;

[0260] COT shared identification information;

[0261] Remaining COT time length.

[0262] For a specific example of the second terminal execution method 1000 in this embodiment, please refer to the relevant description of the second terminal in the above method 900. For the sake of brevity, it will not be repeated here.

[0263] The side-link communication method in this application embodiment may include a method for transmitting control information in side-link positioning based on unlicensed spectrum, which mainly includes the following methods:

[0264] Method 1: SL PRS transmission information and COT sharing information are indicated via SCI format 2-D. On unlicensed spectrum, SCI format 1-A contains a bit field indicating whether COT sharing information exists 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 sharing information are communicated through a new second-order SCI instruction. For example, SCI format 2-E can include one of SCI formats 2-A and 2-B, and can also include COT sharing information and SL PRS transmission information.

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

[0267] Method 4: COT shared information is sent via at least two new second-order SCI formats. For example, SCI format 2-E may contain SCI format 2-A and COT shared information, and SCI format 2-F may contain SCI format 2-B and COT shared information. Furthermore, SL PRS is instructed to send information via SCI format 2-D or 2-G. For example, 2-G may include 2-E or 2-F.

[0268] This application embodiment can transmit second-order SCI indication SL PRS transmission information and COT sharing information on unlicensed spectrum. Several specific examples are given below.

[0269] Example 1: SL PRS sends information via SCI format 2-D instructions, which may include COT shared information.

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

[0271] When SL PRS resources are configured / pre-configured in the resource pool, that is, when the current resource pool is a shared resource pool for SL PRS and SL communication, the transmission of SL PRS and COT shared information can be indicated through the "COT Shared Information Indication" field and the "Second-order SCI Format" field, as shown in Table 4.

[0272] Table 4 shows the values ​​of the "COT Shared Information Indicator" field and the correspondence between the values ​​and the second-order SCI format.

[0273] For example, the "COT Shared Information Indication" field and the "Second-order SCI Format" field can be used to indicate whether COT shared information is included in SCI Format 2-D, as shown in Table 5.

[0274] Table 5 shows the values ​​of the "COT Shared Information Indicator" field and the correspondence between the values ​​and the second-order SCI format.

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

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

[0277] In this example, a new second-order SCI format can be defined, such as SCI format 2-E. SCI format 2-E includes a COT sharing information field, an embedded SCI format indication field, an embedded SCI payload, and an SL PRS transmission information indication field. The UE transmits COT sharing information and data reception information in SCI format 2-A or SCI format 2-B via SCI format 2-E. Information in SCI format 2-C is not transmitted via SCI format 2-E.

[0278] According to the first implementation of this example, for an SCI format 1-A transmitted within a resource pool, if the current operation is accompanied by 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), then 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. Values ​​in the "Second-Order SCI Format" field indicate SCI format 2-E under unlicensed spectrum.

[0280] According to the second implementation of this example, for an SCI format 1-A transmitted within a resource pool, if the current operation is accompanied by shared spectrum channel access, or if the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structures (sl-TransmissionStructureForPSCCHandPSSCH), then the SCI format 1-A contains a specific bit field, hereinafter referred to as the "Additional Format Indicator" field. The "Additional Format Indicator" 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: Correspondence between the values ​​of the "Additional Format Instructions" field and the "Second-Order SCI Format" field and the second-order 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 Indicator - 2 bits.

[0285] 3. COT Shared ID Information - 24 bits.

[0286] 4. Remaining COT time length - This bit indicates the remaining COT length that can be used after the signaling is received.

[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-order SCI indicated by the "Embedded SCI Format" field.

[0289] 7. SL PRS transmits information or reserves bits. If it is SL PRS, the transmitted information includes:

[0290] (1)SL PRS Resource ID- bits, where N SL-PRS This indicates the number of SL PRS resources configured / pre-configured in a time slot within 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 shows the correspondence between the values ​​of the embedded SCI format field and the embedded SCI payload and "SL PRS transmission information".

[0293] In this example, the UE can simultaneously indicate SL PRS and COT sharing information by sending a new second-order SCI format, which helps reduce the number of second-order SCIs that the UE needs to support. At the same time, the first implementation method in this example 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 sharing information, and the UE sends one of them to indicate SL PRS and COT sharing 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 contains the SL PRS transmission information field, the COT sharing information field, and information from SCI format 2-A; SCI format 2-F contains the SL PRS transmission information field, the COT sharing information field, and information from SCI format 2-B. The UE indicates the SL PRS, COT sharing information, and information indicating data reception from SCI format 2-A or 2-B by transmitting SCI format 2-E or SCI format 2-F.

[0296] Specifically, the following information is sent in 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 Indicator - 2 bits.

[0299] 3. COT Shared ID Information - 24 bits.

[0300] 4. Remaining COT time length - This bit indicates the remaining COT length that can be used after the signaling is received.

[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 information transmission may include the following exemplary implementations:

[0303] The first implementation, where the bit field includes an example of the information field, is as follows:

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

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

[0306] The second implementation, where the bit field includes an example of the information 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 This indicates the number of SL PRS resources configured / pre-configured in a time slot within 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 an SCI format 1-A transmitted within a resource pool, if the current operation is accompanied by shared spectrum channel access, or if the current SL BWP is configured with parameters indicating the PSCCH and PSSCH structures (SL-Transmission Structure For PSCCH and PSSCH), then the SCI format 1-A contains a specific bit field, hereinafter referred to as the "Additional Format Indicator" field. The "Additional Format Indicator" 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] Table 9 shows an example of a second-order SCI format that is jointly indicated by the "Additional Format Indication" field and the "Second-order SCI Format" field:

[0312] Table 9 shows the values ​​of the "Additional Format Instructions" field and the "Second-Order SCI Format" field, and their correspondence with the second-order SCI format.

[0313] Since SCI format 2-B has more bits than SCI format 2-A, in Example 2, when COT sharing 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 one second-order SCI format that includes one of the above and SL PRS transmission.

[0315] In this example, two new second-order SCI formats can be defined, such as SCI format 2-E and SCI format 2-F. The information contained in SCI formats 2-E and 2-F can be basically the same as in Example 3, but SL PRS transmission information is not included.

[0316] For example, the UE sends SL PRS and COT sharing information by sending SCI format 2-G, which includes the following exemplary information fields:

[0317] 1.SL PRS Resource ID- bits, where N SL-PRS This indicates the number of SL PRS resources configured / pre-configured in a time slot within 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-order SCI indicated by the "Embedded SCI Format" field.

[0321] Table 10. Correspondence between the values ​​of the embedded SCI format field and the embedded SCI payload.

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

[0323] The above examples only include a few implementation schemes. Other extended schemes can also be used to instruct SL PRS and COT to share information, as shown in the following examples.

[0324] First extended scheme: COT shared information is sent via SCI format 2-C, and the resource pool configuration ensures that SCI format 2-C can carry both COT shared information and SCI format 2-B. Instructions for SL PRS to send may include the following:

[0325] 1. SL PRS is sent only via SCI format 2-D instructions; SL PRS does not share information with COT and is sent in the same time slot; or,

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

[0327] The second extension scheme: Based on Example 3, a new second-order SCI format can be defined, such as SCI format 2-G. SCI format 2-G contains the SL PRS transmission information field, the COT sharing 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 this application. The first terminal 1100 may include: a transmitting unit 1101, configured to transmit first control information, the first control information including SL PRS transmission information and / or COT sharing information.

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

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

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

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

[0333] In one implementation, 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.

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

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

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

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

[0338] In one implementation, 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 transmission information and the COT sharing information.

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

[0340] In one implementation, the first-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order SCI format includes a fourth format and a fifth format.

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

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

[0343] In one implementation, the first-order SCI includes a fifth information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format includes a fourth format, a fifth format, and a sixth format.

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

[0345] In one implementation, the embedded SCI format field in the sixth format is used to indicate the fourth or fifth format, wherein 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 transmission information.

[0347] In one implementation, the first format includes SCI format 2-D.

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

[0349] In one implementation, the fourth format includes SCI format 2-E.

[0350] In one implementation, the fifth format includes SCI format 2-F.

[0351] In one implementation, the sixth format includes SCI format 2-G.

[0352] In one implementation, the first-order SCI format includes SCI format 1-A.

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

[0354] Embedded SCI format;

[0355] Embedded SCI payload.

[0356] In one implementation, the SL PRS transmits information including at least one of the following:

[0357] SL PRS resource identifier;

[0358] SL PRS request.

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

[0360] Channel access priority;

[0361] Unicast, multicast, or broadcast instructions;

[0362] COT shared identification information;

[0363] Remaining COT time length.

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

[0365] Figure 12 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 used to receive first control information, which includes SL PRS transmission information and / or COT sharing information.

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

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

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

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

[0371] In one implementation, 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.

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

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

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

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

[0376] In one implementation, 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 transmission information and the COT sharing information.

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

[0378] In one implementation, the first-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order SCI format includes a fourth format and a fifth format.

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

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

[0381] In one implementation, the first-order SCI includes a fifth information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order SCI format includes a fourth format, a fifth format, and a sixth format.

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

[0383] In one implementation, the embedded SCI format field in the sixth format is used to indicate the fourth or fifth format, wherein 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 transmission information.

[0385] In one implementation, the first format includes SCI format 2-D.

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

[0387] In one implementation, the fourth format includes SCI format 2-E.

[0388] In one implementation, the fifth format includes SCI format 2-F.

[0389] In one implementation, the sixth format includes SCI format 2-G.

[0390] In one implementation, the first-order SCI format includes SCI format 1-A.

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

[0392] Embedded SCI format;

[0393] Embedded SCI payload.

[0394] In one implementation, the SL PRS transmits information including at least one of the following:

[0395] SL PRS resource identifier;

[0396] SL PRS request.

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

[0398] Channel access priority;

[0399] Unicast, multicast, or broadcast instructions;

[0400] COT shared identification information;

[0401] Remaining COT time length.

[0402] The second terminal 1200 in this embodiment can implement the corresponding functions of the second terminal in the aforementioned method embodiments. The processes, functions, implementation methods, and beneficial effects of each module (sub-module, unit, or component, etc.) in the second terminal 1200 can be found in the corresponding descriptions in the above method embodiments, and will not be repeated here. It should be noted that the functions described for each module (sub-module, unit, or component, etc.) in the second terminal 1200 of this embodiment 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 this application. The communication device 1300 includes a processor 1310, which can call and run computer programs from memory to enable the communication device 1300 to implement the methods in the embodiments of this application.

[0404] In one embodiment, the communication device 1300 may further include a memory 1320. The processor 1310 can retrieve and run computer programs from the memory 1320 to enable the communication device 1300 to implement the methods described in the embodiments of this application.

[0405] The memory 1320 can be a separate device independent of the processor 1310, or it can 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, it 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 present application embodiment, and the communication device 1300 may implement the corresponding processes implemented by the first terminal in the various methods of the present application embodiment. For the sake of brevity, it will not be described in detail here.

[0409] In one embodiment, the communication device 1300 may be the second terminal of the present application embodiment, and the communication device 1300 may implement the corresponding processes implemented by the second terminal in the various methods of the present application embodiment. For the sake of brevity, it will not be described in detail here.

[0410] Figure 14 is a schematic structural diagram of a chip 1400 according to an embodiment of this application. The chip 1400 includes a processor 1410, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0411] In one embodiment, chip 1400 may further include memory 1420. Processor 1410 can retrieve and run computer programs from memory 1420 to implement the methods executed by the first terminal or the second terminal in this embodiment.

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

[0413] In one embodiment, the chip 1400 may further include an input interface 1430. The processor 1410 can control the input interface 1430 to communicate with other devices or chips; specifically, it can acquire 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 can control the output interface 1440 to communicate with other devices or chips; specifically, it can output information or data to other devices or chips.

[0415] In one implementation, the chip can be applied to the first terminal in the embodiments of this application, and the chip can implement the corresponding processes implemented by the first terminal in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0416] In one implementation, the chip can be applied to the second terminal in the embodiments of this application, and the chip can implement the corresponding processes implemented by the second terminal in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

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

[0418] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0419] The processors mentioned above can be general-purpose processors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processors mentioned above can be microprocessors or any conventional processor.

[0420] The aforementioned memory can be volatile memory or non-volatile memory, or a combination of both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM).

[0421] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this 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 memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0422] Figure 15 is a schematic block diagram of a communication system 1500 according to an embodiment of this application. The communication system 1500 includes a first terminal 1510 and a second terminal 1520.

[0423] The first terminal 1510 is used to send first control information, which includes SL PRS transmission information and / or COT sharing information.

[0424] The second terminal 1520 is used to receive first control information, which includes SL PRS transmission 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, further details are omitted here.

[0426] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

[0427] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

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

[0429] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A side-channel communication method, comprising: The first terminal sends first control information, which includes lateral positioning reference signal (SL PRS) transmission information and / or channel occupancy time (COT) sharing information.

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

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

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

5. The method according to claim 3, wherein, The COT shared information indication field, together with the second-order SCI format field in the first-order SCI, indicates whether the second-order SCI format is a first format containing SL PRS transmission information and whether the first format includes COT shared information.

6. The method according to claim 5, wherein, The COT shared information indication field, together with the second-order SCI format field, indicates whether the first format includes the COT shared information field.

7. The method according to claim 5, wherein, The COT shared information indication field, together with the second-order SCI format field, indicates whether the second or 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, which is used to indicate that the second-order SCI format is a fourth format in the unlicensed spectrum scenario. The fourth format includes the SL PRS transmission information and the COT sharing information, and the fourth format also includes information from the second or 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 licensed spectrum scenario is a first format, and the first format includes the SL PRS transmission information.

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

11. The method according to claim 2, wherein, 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 transmission 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-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order 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 transmission information, the COT sharing information, and the information in the second format; the fifth format includes the SL PRS transmission information, the COT sharing information, and the information in the third format.

16. The method according to claim 2, wherein, The first-order SCI includes a fifth information field, which, together with the second-order SCI format field in the first-order SCI, indicates that the second-order 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 transmission information.

20. The method according to claim 5, 6, 7 or 9, wherein, The first format includes SCI format 2-D.

21. The method according to 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 format includes SCI format 1-A.

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

27. The method according to any one of claims 1 to 26, wherein, The SL PRS transmission 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 instructions; COT shared identification information; Remaining COT time length.

29. A side-channel communication method, comprising: The second terminal receives the first control information, which includes SL PRS transmission information and / or COT sharing information.

30. The method according to claim 29, wherein, The first control information is a second-level SCI, and whether the second-level SCI includes SL PRS transmission information and / or COT sharing information is indicated by the first-level SCI.

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

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

33. The method according to claim 31, wherein, The COT shared information indication field, together with the second-order SCI format field in the first-order SCI, indicates whether the second-order SCI format is a first format containing SL PRS transmission information and whether the first format includes COT shared information.

34. The method according to claim 33, wherein, The COT shared information indication field, together with the second-order SCI format field, indicates whether the first format includes the COT shared information field.

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

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

37. The method according to 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 licensed spectrum scenario is a first format, and the first format includes the SL PRS transmission information.

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

39. The method according to claim 30, wherein, 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 transmission information and the COT sharing information.

40. The method according to claim 39, wherein, The third information field is an additional format field.

41. The method according to claim 30, wherein, The first-order SCI includes a fourth information field, which, together with the second-order SCI format field, indicates that the second-order 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 transmission information, the COT sharing information, and the information in the second format; the fifth format includes the SL PRS transmission information, the COT sharing information, and the information in the third format.

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

45. The method according to claim 44, wherein, The fifth information field is an additional format field.

46. ​​The method according to 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 according to claim 46, wherein, The sixth format also includes the SL PRS transmission information.

48. The method according to claim 33, 34, 35 or 37, wherein, The first format includes SCI format 2-D.

49. The method according to 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. The method according to any one of claims 29 to 52, wherein, The first-order SCI format includes SCI format 1-A.

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

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

56. The 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 instructions; COT shared identification information; Remaining COT time length.

57. A first terminal, comprising: The transmitting unit is used to transmit first control information, which includes SL PRS transmission information and / or COT sharing information.

58. A second terminal, comprising: The receiving unit is configured to receive first control information, which includes SL PRS transmission 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 invoke and run the computer program stored in the memory to cause the terminal device to perform the method as described in any one of claims 1 to 56.

60. A chip, comprising: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1 to 56.

61. A computer-readable storage medium for storing a computer program that, when run by a device, causes the device to perform the method as described in any one of claims 1 to 56.

62. A computer program product comprising computer program instructions that cause a computer to perform the method as described in any one of claims 1 to 56.

63. A computer program that causes a computer to perform the method as claimed in any one of claims 1 to 56.

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

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