WO2023206145A1

WO2023206145A1 - Wireless communication method and communication device

Info

Publication number: WO2023206145A1
Application number: PCT/CN2022/089576
Authority: WO
Inventors: 赵振山; 张世昌
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2023-11-02

Abstract

Provided are a wireless communication method and a communication device. The method comprises: a first communication device determines, according to first information, whether to transmit a first sidelink channel on a shared spectrum in a first channel access mode (S1410), the first information comprising one or more of the following: the type of the first sidelink channel; the channel access result of the second channel access mode; the priority corresponding to the first sidelink channel; indication information of the channel access mode; and whether the current transmission opportunity is the last transmission opportunity of the first sidelink channel. The first channel access mode is a channel access mode wherein the shared spectrum is not monitored before the first sidelink channel is transmitted on the shared spectrum. According to the embodiments of the present invention, the first information is introduced to clarify the factors that need to be considered when the first sidelink channel is transmitted on the shared spectrum in the first channel access mode, thereby facilitating the application of a sidelink system to the shared spectrum.

Description

Wireless communication method and communication device

Technical field

The present application relates to the field of communication technology, and more specifically, to a wireless communication method and communication device.

Background technique

Shared spectrum (or unlicensed spectrum) can support multiple channel access methods. If you want to apply the sidelink system to the shared spectrum, there are currently no clear regulations on how to perform channel access.

Contents of the invention

This application provides a wireless communication method and communication equipment. Each aspect involved in this application is introduced below.

A first aspect provides a wireless communication method, including: a first communication device determining whether to transmit a first sidelink channel on a shared spectrum through a first channel access method according to first information; wherein the first information includes One or more of the following: the type of the first sidelink channel; the channel access result of the second channel access method; the priority corresponding to the first sidelink channel; and an indication of the channel access method Information; wherein the first channel access method is a channel access method that does not listen to the shared spectrum before transmitting the first side channel on the shared spectrum; the second channel access method is A channel access method of listening to the shared spectrum before transmitting the first sidelink channel on the shared spectrum.

In a second aspect, a communication device is provided, including: a determining module configured to determine whether to transmit a first sidelink channel on a shared spectrum through a first channel access mode according to first information; wherein the first information includes the following One or more of: the type of the first side channel; the channel access result of the second channel access method; the priority corresponding to the first side channel; and the indication information of the channel access method ; Wherein, the first channel access method is a channel access method that does not listen to the shared spectrum before transmitting the first side channel on the shared spectrum; the second channel access method is A channel access method of listening to the shared spectrum before transmitting the first sidelink channel on the shared spectrum.

In a third aspect, a communication device is provided, including a memory and a processor, the memory is used to store a program, and the processor is used to call the program in the memory, so that the communication device executes as described in the first aspect Methods.

A fourth aspect provides a device, including a processor, for calling a program from a memory, so that the device executes the method described in the first aspect.

In a fifth aspect, a chip is provided, including a processor for calling a program from a memory, so that a device installed with the chip executes the method described in the first aspect.

A sixth aspect provides a computer-readable storage medium, characterized in that a program is stored thereon, and the program causes a computer to execute the method described in the first aspect.

A seventh aspect provides a computer program product, including a program that causes a computer to execute the method as described in the first aspect.

An eighth aspect provides a computer program, which causes a computer to perform the method described in the first aspect.

By introducing the first information, this application clarifies the factors that need to be considered when transmitting the first sidelink channel through the first channel access method on the shared spectrum, which is helpful for applying the sidelink system to the shared spectrum.

Description of the drawings

FIG. 1 is an example system architecture diagram of a wireless communication system to which embodiments of the present application can be applied.

Figure 2 is an example diagram of a side communication scenario within network coverage.

Figure 3 is an example diagram of a sidelink communication scenario with partial network coverage.

Figure 4 is an example diagram of a sidelink communication scenario outside network coverage.

Figure 5 is an example diagram of a scenario for side communication based on a central control node.

Figure 6 is an example diagram of a broadcast-based sidelink communication method.

Figure 7 is an example diagram of a unicast-based sidelink communication method.

Figure 8 is an example diagram of a multicast-based sidelink communication method.

Figure 9A is an example diagram of a time slot structure used in a sidelink communication system.

FIG. 9B is another example diagram of a time slot structure used in a sidelink communication system.

Figure 10 is an example diagram of the lateral feedback process.

Figure 11 is an example diagram of the sidelink feedback process during multicast transmission.

Figure 12 is an example diagram of a feedback method for performing PSFCH feedback on a periodic basis.

Figure 13 is an example diagram of a configuration method of side row synchronization resources.

Figure 14 is a schematic flowchart of a wireless communication method provided by an embodiment of the present application.

Figure 15 is a schematic diagram of a possible implementation of step S1410 in Figure 14.

FIG. 16 is a schematic diagram of another possible implementation of step S1410 in FIG. 14 .

Figure 17 is an example diagram of a possible implementation of Embodiment 5 of the present application.

Figure 18 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

Figure 19 is a schematic structural diagram of a device provided by an embodiment of the present application.

Detailed ways

Communication system architecture

FIG. 1 is an example system architecture diagram of a wireless communication system 100 to which embodiments of the present application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120 . The network device 110 may provide communication coverage for a specific geographical area and may communicate with terminal devices 120 located within the coverage area.

FIG. 1 exemplarily shows a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and/or one or more terminal devices 120 . For a network device 110 , the one or more terminal devices 120 may all be located within the network coverage of the network device 110 , or they may all be located outside the network coverage of the network device 110 , or part of them may be located within the network coverage of the network device 110 . Within the coverage range, the other part is located outside the network coverage range of the network device 110, which is not limited in the embodiment of the present application.

Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the present application.

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

The terminal equipment in the embodiment of this application may also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT) ), remote station, remote terminal equipment, mobile device, user terminal, wireless communication equipment, user agent or user device. The terminal device in the embodiment of the present application may be a device that provides voice and/or data connectivity to users, and may be used to connect people, things, and machines, such as handheld devices and vehicle-mounted devices with wireless connection functions. The terminal device in the embodiment of the present application can be a mobile phone (mobile phone), a tablet computer (Pad), a notebook computer, a handheld computer, a mobile internet device (mobile internet device, MID), a wearable device, a vehicle, an industrial control (industrial) Wireless terminals in control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, and transportation safety Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc. For example, the terminal device may act as a scheduling entity that provides sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device communication (D2D), etc. . For example, cell phones and cars use sidelink signals to communicate with each other. Cell phones and smart home devices communicate between each other without having to relay communication signals through base stations. Optionally, the terminal device can be used to act as a base station.

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

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

In some deployments, the network device in the embodiment of this application may refer to a CU or a DU, or the network device includes a CU and a DU. gNB can also include AAU.

Network equipment and terminal equipment can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the sky. In the embodiments of this application, the scenarios in which network devices and terminal devices are located are not limited.

Sidelink communication under different network coverage conditions

Sidelink communication refers to communication technology based on sidelinks. Sideline communication can be, for example, device-to-device (D2D) or vehicle-to-everything (V2X) communication. Communication data in traditional cellular systems is received or sent between terminal devices and network devices, while sideline communication supports direct transmission of communication data between terminal devices. Compared with traditional cellular communications, direct transmission of communication data between terminal devices can have higher spectrum efficiency and lower transmission delay. For example, the Internet of Vehicles system uses side-travel communication technology.

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

Figure 2 is an example diagram of a side communication scenario within network coverage. In the scenario shown in Figure 2, both terminal devices 120a are within the coverage of the network device 110. Therefore, both terminal devices 120a can receive the configuration signaling of the network device 110 (the configuration signaling in this application can also be replaced with configuration information), and determine the side row configuration according to the configuration signaling of the network device 110. After both terminal devices 120a are configured for sidelink, sidelink communication can be performed on the sidelink link.

Figure 3 is an example diagram of a sidelink communication scenario with partial network coverage. In the scenario shown in Figure 3, the terminal device 120a and the terminal device 120b perform side-line communication. The terminal device 120a is located within the coverage of the network device 110, so the terminal device 120a can receive the configuration signaling of the network device 110 and determine the sidelink configuration according to the configuration signaling of the network device 110. The terminal device 120b is located outside the network coverage and cannot receive the configuration signaling of the network device 110. In this case, the terminal device 120b may be configured according to the pre-configuration information and/or the information carried in the physical sidelink broadcast channel (PSBCH) sent by the terminal device 120a located within the network coverage. Determine side row configuration. After both the terminal device 120a and the terminal device 120b perform side-link configuration, side-link communication can be performed on the side-link.

Figure 4 is an example diagram of a sidelink communication scenario outside network coverage. In the scenario shown in Figure 4, both terminal devices 120b are located outside the network coverage. In this case, both terminal devices 120b can determine the side row configuration according to the preconfiguration information. After both terminal devices 120b are configured for sidelink, sidelink communication can be performed on the sidelink link.

Side communication based on central control node

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

side communication mode

Some standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two modes of sideline communication: first mode and second mode.

In the first mode, the resources of the terminal device (the resources mentioned in this application may also be called transmission resources, such as time-frequency resources) are allocated by the network device. The terminal device can send data on the sidelink according to the resources allocated by the network device. The network device can allocate single-transmission resources to the terminal device or allocate semi-static transmission resources to the terminal device. This first mode can be applied to scenarios covered by network devices, such as the scenario shown in Figure 2 above. In the scenario shown in Figure 2, the terminal device 120a is located within the network coverage of the network device 110, so the network device 110 can allocate resources used in the sidelink transmission process to the terminal device 120a.

In the second mode, the terminal device can autonomously select one or more resources from the resource pool (RP). Then, the terminal device can perform sidelink transmission according to the selected resources. For example, in the scenario shown in Figure 4, the terminal device 120b is located outside the cell coverage. Therefore, the terminal device 120b can autonomously select resources from the preconfigured resource pool for sidelink transmission. Alternatively, in the scenario shown in FIG. 2 , the terminal device 120a can also independently select one or more resources from the resource pool configured by the network device 110 for side transmission.

Data transmission method for side-line communication

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

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

For unicast transmission, the receiving terminal generally has only one terminal device. Taking Figure 7 as an example, unicast transmission is performed between terminal device 1 and terminal device 2. Terminal device 1 may be a sending terminal, and terminal device 2 may be a receiving terminal, or terminal device 1 may be a receiving terminal, and terminal device 2 may be a sending terminal.

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

Time slot structure for sidelink communication

The communication system can define the frame, subframe or time slot structure of the sidelink communication. Some sideline communication systems define multiple time slot structures. For example, NR-V2X defines two slot structures. One of the two time slot structures does not include the physical sidelink feedback channel (PSFCH), see Figure 9A; the other of the two time slot structures includes the PSFCH, See Figure 9B.

The physical sidelink control channel (PSCCH) in NR-V2X can use the second sidelink symbol of the time slot as the starting position in the time domain, and the PSCCH can occupy 2 or 3 in the time domain. symbols (the symbols mentioned here can all refer to orthogonal frequency division multiplexing (OFDM) symbols). PSCCH can occupy multiple physical resource blocks (PRBs) in the frequency domain. For example, the number of PRBs occupied by PSCCH can be selected from the following values: {10,12 15,20,25}.

In order to reduce the complexity of blind detection of PSCCH by terminal equipment, usually, only one number of symbols and the number of PRBs are configured for PSCCH in a resource pool. In addition, since NR-V2X uses sub-channels as the minimum granularity of physical sidelink shared channel (PSSCH) resource allocation, the number of PRBs occupied by PSCCH must be less than or equal to the PRBs contained in a sub-channel in the resource pool. number.

Referring to Figure 9A, for a time slot structure that does not include PSFCH, the PSSCH in NR-V2X may use the second siderow symbol of the time slot as the starting position in the time domain. The last sidelink symbol in this time slot is used as a guard period (GP), and the remaining symbols can be mapped to PSSCH. The first siderow symbol in the slot may be a repetition of the second siderow symbol. Generally speaking, the terminal equipment as the receiving end will use the first sideline symbol as the symbol for automatic gain control (AGC). Therefore, the data on the first side row symbol is usually not used for data demodulation. PSSCH can occupy K sub-channels in the frequency domain, and each sub-channel can include M consecutive PRBs (the values of K and M can be predefined by the protocol, or pre-configured, or configured by the network equipment, or depend on the terminal equipment implementation) .

Figure 9B shows a time slot structure including PSFCH. Figure 9B schematically shows the positions of symbols occupied by PSFCH, PSCCH, and PSSCH in one time slot. The main difference between this slot structure and Figure 9A is that the penultimate symbol and the penultimate symbol in the slot are used to transmit PSFCH. In addition, a symbol before the symbol used to transmit PSFCH is also used as GP. It can be seen from the time slot structure shown in Figure 9B that in a time slot, the last symbol is used as GP, the second to last symbol is used for PSFCH transmission, the data on the third to last symbol and the data on the penultimate symbol are used for PSFCH transmission. The data of the second to last symbol is the same, that is, the third to last symbol serves as the symbol for AGC, and the fourth to last symbol has the same function as the last symbol and is also used as GP. In addition, the first symbol in the slot is used as AGC, the data on this symbol is the same as the data on the second symbol in the slot, PSCCH occupies 3 symbols, and the remaining symbols can be used for PSSCH transmission.

Sidelink feedback channel

In some communication systems (such as NR-V2X), in order to improve the reliability of sidelink communication, the sidelink feedback channel is introduced. For example, as shown in Figure 10, for unicast transmission, terminal device 1 (the terminal device as the sending end) sends sideline data (including PSCCH and/or PSSCH) to terminal device 2 (the terminal device as the receiving end). After receiving the sideline data, the terminal device 2 sends sideline feedback information to the terminal device 1 . The sidelink feedback information may be HARQ feedback information, for example. The HARQ feedback information may include, for example, an acknowledgment (ACK) and a negative acknowledgment (NACK). Terminal device 1 can determine whether retransmission is required based on the sideline feedback information of terminal device 2. The sidelink feedback information may be carried in a sidelink feedback channel. The sidelink feedback channel may be, for example, PSFCH.

In some scenarios of sideline communication (such as the multicast transmission scenario mentioned above), two types of sideline feedback methods are introduced. The first type of side feedback method is a side feedback method that only feeds back NACK. This type of lateral feedback method can also be called NACK-only lateral feedback method. The second type of side feedback method is the side feedback method that feeds back ACK/NACK. If the sending terminal hopes that the receiving terminal adopts one of the above two types of sidelink feedback methods, the sending terminal can, for example, indicate the sidelink feedback of the receiving terminal in the sidelink control information (SCI). Way.

If the receiving terminal adopts a sidelink feedback method that only feeds back NACK, then when the receiving terminal fails to successfully detect the PSSCH, it can send NACK to the sending terminal; when the receiving terminal successfully detects the PSSCH, it does not need to send sidelink feedback. information. In the sideline feedback mode that only feeds back NACK, the terminal device that needs to send NACK can use the same feedback resource to transmit NACK. This sidelink feedback method can be applied to connection-less multicast transmission. That is to say, in multicast transmission, if a communication group is not established between terminal devices, a sidelink feedback method in which only NACK is fed back can be used for sidelink feedback. In addition, this sideline feedback method is usually related to the communication distance between terminal devices. For example, in multicast transmission, if the communication distance between a receiving terminal and the sending terminal is within a certain distance, the receiving terminal can send sideline feedback information to the sending terminal; if a receiving terminal If the communication distance between the terminal and the sending terminal is outside a certain distance range, the receiving terminal may not send sideline feedback information.

If the receiving terminal adopts the ACK/NACK side-line feedback method, when the terminal device successfully detects the PSSCH, it can feed back ACK to the sending terminal, otherwise it can feed back NACK to the sending terminal. This sidelink feedback method can be applied to connection-based multicast transmission. In connection-based multicast transmission, a group of terminal devices forms a communication group, and the terminal devices in each group correspond to an intra-group identifier. For example, as shown in Figure 11, if a communication group includes 4 terminal devices, then the number of group members in the group is 4. In this communication group, the group identifiers of the four terminal devices correspond to ID#0, ID#1, ID#2, and ID#3 respectively. The terminal device in the communication group can learn the number of group members and the group identification of the terminal device in the communication group. When a terminal device sends PSCCH/PSSCH, other terminal devices in the group are receiving terminals, and each receiving terminal decides to feed back ACK or NACK to the sending terminal according to the detected status of PSSCH. When the ACK/NACK sidelink feedback method is adopted, each receiving terminal in the communication group can use different sidelink feedback resources. For example, the receiving terminal in the communication group can perform sideline feedback through frequency division multiplexing (FDM) or code division multiplexing (CDM).

Sidelink feedback channel resources

In order to reduce the overhead of the PSFCH, a sidelink feedback resource (or PSFCH transmission resource) used to carry the PSFCH can be configured in one of every N time slots. In other words, the period of the sidelink feedback resource can be set to N (unit is time slot). The value of N can be 1, 2 or 4, for example. The value of N can be determined through preconfiguration, or the value of N can also be configured by the network device.

The following is an example of the feedback mechanism of PSFCH with reference to Figure 12, taking N=4 as an example. Referring to Figure 12, timeslot 3 and timeslot 7 are configured with sidelink feedback resources for carrying PSFCH (the interval between timeslot 3 and timeslot 7 is N, that is, 4 timeslots) to facilitate the sidelink communication process. Feedback the decoding results of the PSSCH transmitted in the Assuming that the minimum time interval between the PSSCH and its associated PSFCH is 2 time slots, the sidelink feedback information of the PSSCH transmitted in time slots 2, 3, 4, and 5 is all transmitted in time slot 7. Therefore, time slots {2, 3, 4, 5} can be regarded as a time slot set, and the PSFCH corresponding to the PSSCH transmitted in the time slot set is located in the same time slot, that is, they are all located in time slot 7.

Sidelink synchronization channel resources

After the terminal device obtains the synchronization information from the synchronization source, it can send the sidelink synchronization signal and the sidelink broadcast channel on the sidelink link to assist other terminal equipment in obtaining the synchronization information. Resources used to transmit sideline synchronization signals and sideline broadcast channels may be called synchronization resources.

Due to the limitations of half-duplex, a terminal device cannot receive signals on a carrier while transmitting a signal on that carrier. In order to prevent terminal equipment from being unable to receive sideline data sent by other terminal equipment when sending sideline synchronization signals, resulting in sideline data loss, in sidelink link transmission, synchronization transmission resources and sideline data transmission resources can be time-division multiplexed. (time-division multiplexing, TDM) method for transmission. For terminal equipment subject to half-duplex restrictions, sideline systems usually do not support sideline synchronization signals and sideline data transmission in FDM. In addition, due to the limitation of half-duplex, terminal equipment needs to send and receive sideline synchronization signals in different time domain resources. Therefore, in some communication systems (such as NR-V2X), 2 or 3 sets of synchronization resources are usually configured in each synchronization cycle for the transmission and reception of sideline synchronization signals respectively.

Taking the NR SL system as an example, the synchronization period of sideline synchronization resources is usually 160ms. Supports configuring 2 or 3 sets of synchronization resources in each synchronization cycle. In addition, one or more synchronization transmission resources can be configured within each set of synchronization resources. As shown in Figure 13, 2 sets of synchronization resources are configured within the synchronization period (160ms), and each set of synchronization resources is configured with 4 synchronization time slots. One of the two sets of synchronization resources can be used to receive sidelink synchronization signal block (S-SSB), and the other set of synchronization resources can be used to send S-SSB. If the terminal equipment detects a sideline synchronization signal on a certain synchronization time slot, the terminal equipment can use the direct frame number (DFN) carried in the PSBCH (referring to the PSBCH transmitted simultaneously with the sideline synchronization signal). Or the system frame number (SFN) and the time slot number determine whether the synchronization time slot belongs to the first set of synchronization resources or the second set of synchronization resources within a synchronization cycle. After determining that the synchronization time slot belongs to a certain set of synchronization resources, the terminal device can send sideline synchronization signals on 4 time slots of another set of synchronization resources.

The number of synchronization time slots supported in each set of synchronization resources is related to factors such as the frequency band where the synchronization resources are located and the subcarrier spacing. For example, in frequency range 1 (FR1), different subcarrier spacing (SCS) and the number of synchronization time slots supported in each set of synchronization resources can be configured as follows: For 15kHz SCS, each The number of synchronization time slots supported in a set of synchronization resources can adopt the following values {1}; for 30kHz SCS, the number of synchronization time slots supported in each set of synchronization resources can adopt one of the following values {1,2 }; For 60kHz SCS, the number of synchronization time slots supported in each set of synchronization resources can adopt one of the following values {1, 2, 4}. For another example, in frequency range 2 (FR2), the number of synchronization time slots supported by different SCS and each set of synchronization resources can be configured as follows: For 60kHz SCS, the number of synchronization slots supported by each set of synchronization resources The number of time slots can be one of the following values {1, 2, 4, 8, 16, 32}; for 120kHz SCS, the number of synchronization time slots supported in each set of synchronization resources can be the following values One of {1,2,4,8,16,32,64}.

unlicensed spectrum

Unlicensed spectrum is a spectrum allocated by countries and regions that can be used for radio device communications. This spectrum is usually considered a shared spectrum. That is to say, communication equipment in the same or different communication systems can use the spectrum as long as it meets the regulatory requirements set by the country or region on the spectrum, and there is no need to apply for an exclusive spectrum authorization from the government.

In order to allow various communication devices (or communication systems) that use unlicensed spectrum for wireless communication to coexist friendly on this spectrum, some countries or regions have stipulated regulatory requirements that need to be met when using unlicensed spectrum. For example, communication equipment follows the "listen before talk (LBT)" principle. The so-called LBT refers to the need for communication equipment to perform channel sensing (sensing) before transmitting signals on unlicensed spectrum channels. If the channel listening result is that the channel is idle, the communication device can use the channel of the unlicensed spectrum to send signals; if the channel listening result is that the channel is busy, the communication device is usually not allowed to use the channel of the unlicensed spectrum to send signals.

Signal transmission on unlicensed spectrum involves concepts related to channel occupancy. For example, channel occupancy time (COT), maximum channel occupancy time (MCOT), COT of network equipment (such as base stations), and COT of terminal equipment.

MCOT can refer to the maximum length of time that communication devices are allowed to use channels in unlicensed spectrum for signal transmission if LBT is successful. It should be understood that MCOT refers to the time occupied by signal transmission. If the channel access priority of the communication device is different, the MCOT corresponding to the communication device may be different. The maximum value of MCOT can be set to 10ms, for example.

COT can refer to the length of time for signal transmission using channels of unlicensed spectrum after successful LBT. Within the length of time corresponding to the COT, the channel occupied by the signal may be discontinuous in the time domain. Generally speaking, a COT cannot exceed 20ms at most. In addition, the length of time occupied by signal transmission within this COT should not exceed the MCOT.

The COT of a network device is also called a COT initiated by the network device. Taking the network device as gNB as an example, the COT of the network device can be called gNB-initiated COT. The COT of network equipment can refer to the channel occupancy time obtained after successful LBT of network equipment. In addition to being used for downlink transmission, the channel occupancy time of network equipment can also be used for uplink transmission of terminal equipment under certain conditions.

The COT of the terminal device is also called the COT initiated by the terminal device. Taking the terminal device as a UE as an example, the COT of the terminal device can be called a UE-initiated COT. The COT of the terminal device may refer to a channel occupancy time obtained by the terminal device after LBT is successful.

Channel access methods of unlicensed spectrum or shared spectrum

Some communication systems (such as NR-U systems) introduce channel access methods through LBT. In addition, the communication system may also support channel access through short control signaling transmission (SCSt). The above two channel access methods are introduced below respectively.

The basic concept of LBT has been introduced above. Here we focus on introducing several different types of LBT methods (ie, several different types of channel access methods based on LBT).

The Type 1 LBT method (Type 1 LBT method) can also be called multi-slot channel detection based on random backoff based on contention window size adjustment. In the type 1 LBT method, the communication device can initiate channel occupation with a length of T _mcot according to the channel access priority p. If the network device uses the type 1 LBT method, the network device can not only send its own data during the channel occupation period, but also share the COT with the terminal device. Sharing the COT with the terminal device refers to allowing the terminal device to send data within the time period corresponding to the COT (that is, the COT obtained by the network device through channel access). Correspondingly, if the terminal device uses the LBT method of type 1, the terminal device can not only send its own data during the channel occupation period, but also share the COT with the network device. The following table shows the channel access priority and corresponding parameters when the terminal device performs Type 1 LBT mode.

Table 1 Channel access parameters corresponding to different channel priorities

In the above Table 1, m _p refers to the number of backoff time slots corresponding to the channel access priority p, CW _p refers to the contention window size corresponding to the channel access priority p, and CW _min,p refers to The minimum value of CW _p corresponding to channel access priority p, CW _max,p refers to the maximum value of CW _p corresponding to channel access priority p, T _mcot,p refers to the channel access priority The maximum occupied time length of the channel corresponding to level p. Among the four channel access priorities shown in Table 1, p=1 is the highest priority.

The Type 2 LBT method (Type 2 LBT method) can also be called a channel access method based on a fixed-length channel monitoring time slot. Type 2 LBT methods include Type 2A LBT methods (Type 2A LBT methods), Type 2B LBT methods (Type 2B LBT methods), and Type 2C LBT methods (Type 2C LBT methods).

In the type 2A LBT method, the communication equipment can use single time slot detection of the 25us channel. In other words, the communication device can start channel detection 25us before data starts to be sent. The 25us channel detection can include a 16us channel detection and a 9us channel detection. If both detection results indicate that the channel is idle, the channel can be considered to be idle and channel access can be performed.

In the type 2B LBT method, the communication equipment can use a single time slot of 16us for channel detection. During the channel detection process, if the communication device detects that the channel is idle for more than 4us in the last 9us, it can be considered that the channel is idle.

In the type 2C LBT method, the communication device can directly transmit data through the channel without performing channel detection. In the type 2C LBT method, the time difference between this transmission and the previous transmission is less than or equal to 16us. That is to say, if the time difference between two transmissions is less than or equal to 16us, it can be considered as the same transmission and no channel detection is required. It should be noted that in the type 2C LBT method, the transmission time of the communication device is limited and usually cannot exceed 584us.

The channel access method based on LBT is introduced above, and SCSt is introduced below. In the unlicensed spectrum, in order to improve the success rate of communication equipment accessing the channel when transmitting control signaling, SCSt was introduced. SCSt is a transmission in which the communication device does not sense the presence of other signals on the channel. For example, SCSt is a transmission used by communication devices to send management and control frames without sensing the presence of other signals on the channel. In other words, when a communication device uses SCSt, the communication device does not need to listen to the channel to access the channel for transmission. However, certain conditions need to be met to adopt SCSt. For example, if a communication device wishes to use SCSt for channel access, the communication device needs to meet one or more of the following conditions: within the 50ms observation period, the number of times SCSt is used is less than or equal to 50; and within the 50ms observation period During this period, SCSt occupies no more than 2.5ms.

In summary, it can be seen that there are multiple channel access methods for shared spectrum. If you want to apply sidelink systems to shared spectrum, there are currently no clear regulations on how to perform channel access and sidelink channel transmission.

It should be noted that LBT is usually also called channel access. Type 1 LBT method can be called type 1 channel access method. Type 2A LBT method can be called type 2A channel access method. Type 2B LBT The method can be called a type 2B channel access method, and the type 2C LBT method can be called a type 2C channel access method. In the embodiment of this application, LBT and channel access can be replaced with each other.

The embodiment of the present application will be described in detail below with reference to FIG. 14 . The method of Figure 14 may be performed by the first communication device. The first communication device may refer to any type of communication device that supports sideline communication. For example, the first communication device may be any type of terminal device mentioned above.

Referring to Figure 14, in step S1410, the first communication device may determine whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first information.

In some embodiments, the shared spectrum may be nationally and/or regionally allocated spectrum that may be used for communications by communication devices. In other words, shared spectrum can refer to spectrum that does not require exclusive spectrum authorization from the government. For example, communication equipment can use the shared spectrum as long as it meets the regulatory requirements set by the country or region on the shared spectrum without applying for an exclusive spectrum authorization from the government. Communication devices using the shared spectrum may be communication devices from the same communication system or communication devices from different communication systems. In some embodiments, the shared spectrum may be replaced with unlicensed spectrum.

The first channel access method may refer to a channel access method that does not sense (sensing) the shared spectrum before transmitting the first sidelink channel on the shared spectrum. In some embodiments, the first channel access method may refer to a channel access method that does not listen to whether there is a signal in the shared spectrum before transmitting the first sidelink channel on the shared spectrum. As an example, the first channel access method may refer to a non-LBT channel access method, or channel transmission that exempts the LBT process. For example, the first channel access mode may refer to the SCSt mode. The SCSt method refers to a transmission method that can perform channel transmission on a shared spectrum without performing channel listening. As another example, the first channel access method may refer to a type 2C channel access method (type 2C LBT method). For relevant concepts of the short control signaling transmission method and the Type 2C channel access method, please refer to the previous description.

In addition to the first channel access method, the shared spectrum can also support a second channel access method. The second channel access method may refer to a channel access method of listening to the shared spectrum before transmitting the first side channel on the shared spectrum. In some embodiments, the second channel access method may refer to a channel access method that listens to whether there is a signal in the shared spectrum before transmitting the first side channel on the shared spectrum (such as a channel access method based on LBT results). As an example, the second channel access method may include one or more of the following: type 1 channel access (type 1 LBT method), type 2A channel access (type 2A LBT method) and type 2B channel access (Type 2B LBT method).

The first sidelink channel may be any type of sidelink channel (such as a physical sidelink channel) or sidelink signal that is desired to be transmitted on the shared spectrum. Alternatively, the first sidelink channel may be a sidelink channel currently being transmitted or currently being prepared for transmission. In some embodiments, the sidelink channel may include S-SSB. For example, the sidelink channel may include one or more of the following: sidelink primary synchronization signal (S-PSS), sidelink secondary synchronization signal (sidelink secondary synchronization signal, S-SSS) and PSBCH . In some embodiments, the sidelink channel may include PSFCH.

The first information can be defined in many ways. For example, the first information includes one or more of the following: the type of the first sidelink channel; the channel access result of the second channel access method; the sidelink priority of the first sidelink channel; and channel access mode instructions. The first communication device may determine whether to transmit the first side channel on the shared spectrum through the first channel access mode only based on the first information. Alternatively, based on the first information, the first communication device may also determine whether to transmit the first side channel on the shared spectrum through the first channel access method in combination with other information or conditions.

The implementation of step S1410 will be described in more detail below through multiple embodiments. The difference between different embodiments mainly lies in the content of the first information.

Embodiment 1: The first information includes the type of the first side channel

Referring to Figure 15, in Embodiment 1, step S1410 in Figure 14 can be replaced by step S1510, that is, if the first sidelink channel is a first type of channel, the first communication device determines the access mode through the first channel Transmit the first side channel.

The first type of channel may refer to a side channel that can be transmitted through the first channel access mode. The first type of channel can be set according to actual needs. For example, it can be set according to one or more factors such as the transmission period of the sidelink channel, the feedback type, the sidelink priority of the sidelink channel, and other factors.

In some embodiments, the first type of channel may include S-SSB. The S-SSB may include one or more of the following: S-PSS, S-SSS, and PSBCH.

As mentioned previously (see the resource section of the sidelink synchronization channel in the previous article), the period of S-SSB can be 160ms. Two or three sets of transmission resources (such as synchronization time slots) can be configured in each S-SSB cycle, and each set of transmission resources can include one or more transmission resources (such as synchronization time slots). For example, in the first frequency range (Frequency Range, FR1), the number of synchronization time slots supported in different SCS and each set of synchronization resources can be configured as follows: For 15kHz SCS, the number of synchronization time slots supported in each set of synchronization resources The number of slots can take the following values {1}; for 30kHz SCS, the number of synchronization time slots supported in each set of synchronization resources can take one of the following values {1, 2}; for 60kHz SCS, each set The number of synchronization time slots supported in the synchronization resource can adopt one of the following values {1, 2, 4}. Even if multiple sets of transmission resources are configured, the first communication device usually only sends S-SSB in one set of transmission resources and receives S-SSB in other S-SSB resources. For example, for 15kHz SCS, a set of synchronization resources only includes one synchronization time slot. That is to say, if the period of S-SSB is 160 ms, the first communication device will send S-SSB once within 160 ms, and the duration of S-SSB is one time slot. It can be seen that S-SSB has the characteristics of long transmission period and short transmission duration, and meets the SCSt condition requirements for channel transmission mentioned above. Therefore, for S-SSB, channel transmission may be performed through the first channel access method, such as channel transmission through the SCSt method.

In some embodiments, the first type of channel may include PSFCH. The PSFCH mentioned here can be any PSFCH, or it can be a PSFCH that meets certain requirements or conditions.

In some embodiments, the first type of channel may include a PSFCH corresponding to a first sidelink feedback mode. The first sideline feedback method may refer to a sideline feedback method that feeds back ACK/NACK. Alternatively, the first sidelink feedback method may refer to a sidelink feedback method that only feeds back NACK (ie, a NACK-only sidelink feedback method). For example, if the first communication device uses SCI format 2-A in sideline transmission, and the value of the "cast type indicator" information field in SCI format 2-A is "11", it means that the first communication device uses It is a side feedback method that only feeds back NACK. In this case, the PSFCH of the first communication device may be transmitted through the first channel access mode. For another example, if the first communication device uses SCI format 2-B in sidelink transmission, it means that the first communication device uses a sidelink feedback method that only feeds back NACK. In this case, the PSFCH of the first communication device may be transmitted through the first channel access mode.

For the PSFCH corresponding to the sidelink feedback mode that only feeds back NACK, using the first channel access mode for sidelink channel transmission can improve the reliability of transmission. The reasons are analyzed below.

If the sidelink feedback method of only feeding back NACK is adopted, when the receiving end does not receive the PSSCH correctly, the receiving end will feed back the PSFCH (that is, NACK), otherwise the receiving end will not send the PSFCH. Correspondingly, if the sending end does not detect the PSFCH, it will think that the receiving end did not send the PSFCH, that is to say, the sending end will think that the receiving end has correctly received the PSSCH. However, in the shared spectrum, communication equipment may use a listening-based method for channel access to determine whether PSFCH can be transmitted. If the listening result indicates that the receiving end cannot perform channel access, the receiving end will not send the PSFCH. This will cause the sending end to mistakenly believe that the receiving end has correctly received the PSSCH, and will not retransmit the PSSCH. In other words, when the sidelink system is applied to the shared spectrum, if the PSSCH transmitter does not detect the PSFCH, it cannot determine whether the receiver correctly receives the PSSCH and does not need to feed back the PSFCH (hereinafter referred to as case 1), or whether the receiver Channel access failure failed to feed back PSFCH (hereinafter referred to as case 2). Therefore, for the PSFCH corresponding to the sidelink feedback mode that only feeds back NACK, the first channel access mode (that is, the channel access mode that does not require listening) is used to transmit the PSFCH, which can prevent the sending end of the PSSCH from being unable to distinguish the above situation. 1 and case 2, which can improve the reliability of communication.

"Transmitting the PSFCH in the first side-link feedback mode through the first channel access mode" can be determined based on one of the following information: protocol pre-definition information, pre-configuration information (the pre-configuration information mentioned in various embodiments of this application, All may refer to the preconfiguration information of the first communication device), the configuration information of the network device, or the instruction information of the second communication device. The second communication device may be, for example, a communication device that initiates COT sharing. Alternatively, the second communication device may be a communication device transmitting PSSCH (PSSCH associated with PSFCH).

In some embodiments, the first type of channel may include a sidelink channel whose sidelink priority meets a certain condition. For example, the first type of channel may include a PSFCH whose sidelink priority value is less than or equal to the threshold a. It should be noted that the “sidelink priority of the sidelink channel” mentioned in various embodiments of this application may refer to the “priority corresponding to the sidelink channel”. The following embodiments are mainly described in terms of sidelink priority. Taking the sidelink channel as the PSFCH as an example, the sidelink priority of the PSFCH can be determined based on the priority of the PSSCH corresponding to the PSFCH. If the sidelink channel to be transmitted includes multiple PSFCHs, the sidelink priority of the PSFCH may be determined based on the sidelink priorities of one or more PSFCHs (for example, it may be determined based on the sidelink priority of the PSFCH with the highest sidelink priority, Of course, it can also be determined based on the sidelink priority of the PSFCH with the lowest sidelink priority). Taking the sidelink channel as S-SSB as an example, the sidelink priority of S-SSB can be determined based on preconfiguration information or network configuration information.

A PSFCH with a sidelink priority value less than or equal to the threshold a can be considered as a PSFCH with a higher sidelink priority. In order to ensure the transmission success rate of this type of PSFCH, this type of PSFCH can be transmitted using the first channel access method (that is, a channel access method that does not require listening, such as SCSt) to reduce the failure caused by listening failure. This type of PSFCH is sent to ensure the success rate of sending PSFCH with higher sidelink priority.

In some embodiments, the above threshold a may be determined based on one or more of the following: sidelink priority, channel busy ratio (channel busy ratio, CBR), and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on the sidelink quality of service indicator (PC5 quality of service indicator, PQI). As an example, the PSFCH may be specified by the protocol to have the highest or lowest channel access priority. As another example, the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH.

In some embodiments, the above threshold a may also be determined based on preconfiguration information or configuration information of the network device.

As mentioned above, in some embodiments, the first type of channel may include a PSFCH with a sidelink priority value less than or equal to the threshold a. In other embodiments, the first type of channel may include a PSFCH with a priority value greater than or equal to the threshold b. A PSFCH with a sidelink priority value greater than or equal to the threshold b can be considered as a PSFCH with a lower sidelink priority. PSFCHs with lower sidelink priority usually have lower transmission reliability requirements, so such PSFCHs can be sent directly without listening to the busyness of the channel to reduce the complexity of the communication process.

In some embodiments, the above threshold b may be determined based on one or more of the following: sidelink priority, CBR, and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. Alternatively, in some embodiments, the above threshold b may also be determined based on preconfiguration information or configuration information of the network device.

In some embodiments, the first type of channel may include a PSFCH whose periodicity of sidelink feedback resources meets certain conditions. For example, the first type of channel may be a PSFCH in which the period of the sidelink feedback resource is greater than 2 time slots. For example, the first type of channel may be a PSFCH with a sidelink feedback resource period of 4 time slots.

In some embodiments, the first information also includes whether the current transmission opportunity is the last transmission opportunity of the first side channel. If the current transmission opportunity is the last transmission opportunity of the first side channel, the first communication device passes the first The channel access method transmits the first sidelink channel on the shared spectrum; if the current transmission opportunity is not the last transmission opportunity of the first sidelink channel, the first communication device does not transmit the first sidelink channel on the shared spectrum through the first channel access method. Side channel. For example, the first sidelink channel corresponds to M time domain transmission opportunities. If the current transmission opportunity is the last transmission opportunity among the M time domain transmission opportunities, the first communication device transmits on the shared spectrum through the first channel access method. First side channel. In some embodiments, the first communication device transmits the first side channel at most once in the M time domain transmission opportunities. In some embodiments, the first channel access method includes a Type 2C channel access method or a SCSt transmission method. For example, the first sidelink channel is the PSFCH, or the first sidelink channel corresponds to the PSFCH in the sidelink feedback mode that only feeds back NACK. The PSFCH includes M1 time domain transmission opportunities, that is, for the PSSCH, its associated PSFCH includes M1 Time domain transmission opportunities, the sending end of PSFCH can transmit PSFCH in these M1 time domain transmission opportunities. If the current transmission opportunity corresponds to the last transmission opportunity among the M1 time domain transmission opportunities, the first communication device accesses the channel to transmit the PSFCH through the type 2C method, or uses the SCSt transmission method to transmit the PSFCH, so that the PSFCH Able to be transmitted at the last transmission opportunity. For another example, the first sidelink channel is S-SSB, and the S-SSB includes M2 time domain transmission opportunities, that is, a set of synchronization resources within one S-SSB cycle includes M2 time domain transmission opportunities. If the current transmission opportunity corresponds to the last transmission opportunity among the M2 time domain transmission opportunities, then the first communication device accesses the channel to transmit the S-SSB in the type 2C manner, or transmits the S-SSB in the SCSt transmission manner, Thus, the S-SSB can be transmitted in the last transmission opportunity. M, M1 and M2 mentioned above are all positive integers. For example, M, M1 and M2 can all be positive integers greater than 1.

Embodiment 2: The first information includes the channel access result of the second channel access method

In Embodiment 2, the first side channel mentioned above may refer to part or all of the channels to be transmitted. Referring to Figure 16, in Embodiment 2, step S1410 of Figure 14 can be replaced with one or more steps of step S1610 and step S1620.

In some embodiments, the channel access result of the second channel access method may indicate one or more of the following: channel access success, channel idle, channel access failure, and channel busy.

In some embodiments, the channel access result of the second channel access method includes one or more of the following: LBT success, and LBT failure.

In step S1610, if the channel access result of the second channel access method indicates that the channel access is successful or the channel is idle, the first communication device transmits the first side on the shared spectrum according to the channel access result of the second channel access method. Walk the faith.

In step S1620, if the channel access result of the second channel access mode indicates channel access failure or the channel is busy, the first communication device determines whether to transmit the first side channel on the shared spectrum through the first channel access mode. If it is determined that the first side channel can be transmitted on the shared spectrum through the first channel access method, the first communication device can transmit the first side channel on the shared spectrum through the first channel access method; if it is determined that the first side channel cannot be transmitted on the shared spectrum through the first channel access method; If the first channel access method transmits the first side channel on the shared spectrum, the first communication device may not transmit the first side channel on the shared spectrum through the first channel access method (for example, the first communication device may give up transmission on the first side channel). Of course, in some embodiments, if the channel access result of the second channel access method indicates that the channel access fails or the channel is busy, the first communication device can also directly transmit the third channel access method on the shared spectrum through the first channel access method. sidelink channel without first determining whether the first sidelink channel can be transmitted on the shared spectrum based on the first channel access method.

Taking the first channel access method as SCSt (that is, the channel access method that does not require channel monitoring) and the second channel access method as LBT (that is, the channel access method that requires channel monitoring) as an example, The first communication device may first try to perform the LBT operation. If the LBT result corresponding to the LBT operation indicates that the channel access is successful or the channel is idle, the first communication device may transmit the first sidelink channel according to the LBT result. Since the LBT result indicates that the channel access is successful, the first communication device may The entry is successful or the channel is idle, so the first communication device can directly transmit the first side channel. Since this sidelink transmission is not transmitted in SCSt mode, it will not be counted as the number of times SCSt is sent and the duration occupied by SCSt. If the LBT result corresponding to the LBT operation indicates that the channel access fails or the channel is busy, the first communication device may determine whether the first sidelink channel can be transmitted by SCSt. If the first sidelink channel can be transmitted by SCSt, the first communication device can transmit the first sidelink channel by SCSt; if the first sidelink channel cannot be transmitted by SCSt, the first communication device can Abandon the transmission of the first side channel.

As mentioned in step S1620, the first communication device may determine whether to transmit the first side channel on the shared spectrum through the first channel access mode. For example, the first communication device may determine whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first condition. The first condition may be determined based on protocol predefined information, preconfiguration information, configuration information of the network device, or instructions from other communication devices.

In some embodiments, the first condition may be associated with one or more of the following information: a sidelink priority of the first sidelink channel; the first communication device transmits the first sidelink channel within a first time range the total number of times; and the total duration occupied by the first side channel transmitted by the first communication device within the first time range.

Several possible ways to implement the first condition are given below with reference to specific embodiments.

Embodiment 2.1: The first condition is associated with the sidelink priority of the first sidelink channel

In some embodiments, if the value of the sidelink priority of the first sidelink channel is less than or equal to a certain threshold (hereinafter referred to as threshold c), the first communication device determines that the first sidelink channel access mode is on the shared spectrum. Transmit the first side channel. If the value of the sidelink priority of the first sidelink channel is less than or equal to the threshold c, it may indicate that the first sidelink channel is a channel with a higher sidelink priority. That is to say, for a sidelink channel with a higher sidelink priority, if the attempt to use the second channel access method for channel access fails, the first channel access method can be directly used to transmit the first sidelink channel to ensure that the sidelink Transmission reliability of sidelink channels with higher row priority. The above threshold c may be determined based on one or more of the following: sidelink priority, CBR and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. In some embodiments, the threshold c may be determined based on preconfiguration information or configuration information of the network device.

For another example, if the value of the sidelink priority of the first sidelink channel is less than or equal to the threshold c, the first communication device determines not to transmit the first sidelink channel on the shared spectrum through the first channel access mode (such as the first sidelink channel). A communications device abandons transmission of the first side channel). That is to say, for a sidelink channel with a higher sidelink priority, if the attempt to use the second channel access method for channel access fails, the first channel access method may not be used to transmit the first sidelink channel. In other words, for a sidelink channel with a higher sidelink priority, only the second channel access mode can be used to transmit the sidelink channel.

For another example, if the value of the sidelink priority of the first sidelink channel is greater than or equal to the threshold d, the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access mode. A value of the sidelink priority of the first sidelink channel that is greater than or equal to the threshold d may indicate that the first sidelink channel is a channel with a lower sidelink priority. That is to say, for a sidelink channel with a lower sidelink priority, if the attempt to use the second channel access method for channel access fails, the first channel access method can be directly used to transmit the first sidelink channel. The above threshold d may be determined based on one or more of the following: sidelink priority, CBR and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. In some embodiments, the threshold d may be determined based on preconfiguration information or configuration information of the network device.

For another example, if the value of the sidelink priority of the first sidelink channel is greater than or equal to the threshold d, the first communication device determines not to transmit the first sidelink channel on the shared spectrum through the first channel access mode (such as the first sidelink channel). A communications device abandons transmission of the first side channel). That is to say, for a sidelink channel with a lower sidelink priority, if the attempt to use the second channel access method for channel access fails, the first channel access method may not be used to transmit the first sidelink channel. In other words, for a sidelink channel with a lower sidelink priority, only the second channel access mode can be used to transmit the sidelink channel.

Embodiment 2.2: The first condition is associated with the total number of times the first communication device transmits the first side channel within the first time range

In some embodiments, the total number of times the first communication device transmits the first side channel within the first time range may refer to: the first communication device transmits the first side channel through the first channel access method within the first time range. The total number of channels.

Taking the first sidelink channel as PSFCH as an example, the total number of times the first communication device transmits the first sidelink channel within the first time range may refer to the total number of times the first communication device transmits PSFCH within the first time range.

Taking the first sidelink channel as S-SSB as an example, the total number of times the first communication device transmits the first sidelink channel within the first time range may refer to the number of times the first communication device transmits S-SSB within the first time range. Total times.

Taking the first sidelink channel including PSFCH and S-SSB as an example, the total number of times the first communication device transmits the first sidelink channel within the first time range may include the PSFCH transmitted by the first communication device within the first time range. times, and the number of S-SSB transmissions by the first communication device within the first time range.

In some embodiments, the first time range may be determined based on preconfiguration information or configuration information of the network device.

In some embodiments, the first time range may be 50 milliseconds (ms).

The first time range may include multiple time slots. For example, the first time range includes the time slot [nT _start , nT _end ], where T _end =1; T _start =T ₁ ·2 ^μ . n may represent the time slot corresponding to the first sidelink channel. T ₁ can represent the duration corresponding to the first time range. μ can represent a parameter determined based on the size of the sidelink subcarrier spacing. μ can take values based on the mapping relationship shown in Table 2 below. In this embodiment, the first time range does not include time slot n, that is, it does not include the time slot corresponding to the first sidelink channel.

Table 2

μμ	Δf＝2 ^μ·15[kHz] Δf＝ ^2μ ·15[kHz]
00	1515
11	3030
22	6060
33	120120

For another example, the first time range includes the time slot [nT _start , nT _end ], where T _end =0; T _start =T ₁ ·2 ^μ -1. For explanations of n, T ₁ and μ, please refer to the previous embodiment. In this embodiment, the first time range includes time slot n. That is to say, if the first communication device is ready to transmit the first sidelink channel using the first channel access method in time slot n, it can determine the total number of times to send the first sidelink channel within the first time range, and the total number of times Includes the first sidelink channel to be transmitted in time slot n.

In some embodiments, if there are multiple first sidelink channels to be transmitted in one time slot. Then the transmission of the multiple first side channels can be regarded as one transmission or multiple transmissions. For example, sidelink systems generally support the simultaneous transmission of N PSFCHs in one time slot (where N is an integer greater than or equal to 1). Since N PSFCHs are located in one time slot, the communication device will only access the channel once and transmit the N PSFCHs at the same time. Therefore, even if N is greater than 1, the transmission of the N PSFCHs can be regarded as one transmission.

In some embodiments, if the total number of times the first communication device transmits the first side channel within the first time range is less than or equal to the threshold e, the first communication device determines to transmit on the shared spectrum through the first channel access method. First side channel. Alternatively, in some embodiments, if the total number of times the first communication device transmits the first side channel within the first time range is greater than the threshold e, the first communication device determines not to use the first channel access method on the shared spectrum. Transmitting the first side channel (eg, the first communication device gives up transmitting the first side channel).

The above threshold e may be determined based on one or more of the following: sidelink priority, CBR and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. For example, for sidelink channels with different sidelink priorities, corresponding thresholds e can be configured. The threshold e corresponding to sidelink channels with different sidelink priorities may be the same or different. The threshold e may be determined based on preconfiguration information or configuration information of the network device. As an example, the threshold e may be equal to 50.

For ease of understanding, below, the first channel access mode is the SCSt mode as an example, and several more specific examples are given.

For example, the first sidelink channel is the sidelink synchronization signal (S-SSB) shown in FIG. 13 . For this S-SSB, its synchronization period is 160ms. In the example of Figure 13, 2 sets of synchronization resources are configured in each synchronization cycle, and each set of synchronization resources includes 4 synchronization time slots (ie, 4 SSB transmission opportunities). Since the first communication device only uses one of the two sets of synchronization resources to send S-SSB, in the synchronization period of 160 ms, the first communication device sends S-SSB four times in total. If the first time range is 50ms and the threshold e is equal to 50, then even if 4 SSB transmissions are all within the first time range of 50ms, the total number of S-SSB transmissions in the first time range does not exceed the threshold e. It can be seen that if the first sidelink channel is S-SSB, the first communication device can use the SCSt mode to perform channel access when sending S-SSB.

For another example, the first sidelink channel may be a PSFCH with a cycle of 4 time slots, that is, one time slot in every 4 time slots contains a PSFCH transmission resource (hereinafter, this time slot will be referred to as a PSFCH time slot for short). If the first time range is 50 ms, for a sidelink system with 30 kHz subcarrier spacing, the first time range may include 100 time slots, so the number of PSFCH time slots included in the first time range is 25. If the threshold e is equal to 50, then even if the first communication device sends PSFCH in every PSFCH time slot, within the range of any 100 time slots, the total number of times the first communication device sends PSFCH does not exceed 100, so it can The SCSt method is used for channel access.

For another example, the first sidelink channel may be a PSFCH with a period of one time slot, that is, each time slot includes PSFCH transmission resources (or, in other words, each time slot is a PSFCH time slot). If the first time range is 50ms, for a sidelink system with 30kHz subcarrier spacing, the above-mentioned first time range may include 100 PSFCH time slots. If the threshold e is equal to 50, the number of PSFCHs sent by the first communication device within the first time range may exceed the threshold e. Therefore, when the first communication device needs to send PSFCH in time slot n, it can first determine whether the total number of PSFCHs that have been sent using the SCSt method in time slot [n-100, n-1] has exceeded 50 times. If it exceeds 50 times, the first communication device determines not to transmit the PSFCH of time slot n in SCSt mode; if it does not exceed 50 times, the first communication device determines to transmit the PSFCH of time slot n in SCSt mode. Or, when the first communication device needs to send PSFCH in time slot n, it can first determine whether the total number of PSFCHs that have been sent using the SCSt method in time slot [n-99, n] (including the PSFCH to be sent in time slot n) has been More than 50 times. If it exceeds 50 times, the first communication device determines not to transmit the PSFCH of time slot n in SCSt mode; if it does not exceed 50 times, the first communication device determines to transmit the PSFCH of time slot n in SCSt mode.

Embodiment 2.3: The first condition is associated with the total duration occupied by the first side channel transmitted by the first communication device within the first time range

In some embodiments, the total duration occupied by the first side channel transmitted by the first communication device within the first time range may refer to: the first communication device transmits the first side channel through the first channel access method within the first time range. The total duration of one side of the channel.

For the definition and determination method of the first time range, please refer to the description in Embodiment 2.2, and will not be described again here.

In some embodiments, if the total duration occupied by the first side channel transmitted by the first communication device within the first time range is less than or equal to the threshold f, the first communication device determines that the first side channel is shared through the first channel access method. The first side channel is transmitted on the spectrum. Alternatively, if the total time occupied by the first side channel transmitted by the first communication device within the first time range is greater than the threshold f, the first communication device determines not to transmit the first side channel on the shared spectrum through the first channel access method. Sidelink channel (e.g., the first communication device abandons transmission of the first sidelink channel).

The above threshold f may be determined based on one or more of the following: sidelink priority, CBR and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. For example, for sidelink channels with different sidelink priorities, corresponding thresholds f can be configured for different sidelink channels. The threshold f corresponding to sidelink channels with different sidelink priorities may be the same or different. The threshold f may be determined based on preconfiguration information or configuration information of the network device. As an example, the threshold f may be equal to 2500 microseconds (μs).

Embodiment 2.2 and Embodiment 2.3 may be independent of each other or may be combined with each other. For example, the total number of times the first communication device transmits the first side channel within the first time range may be required to be less than or equal to the threshold e, and the first communication device may be required to transmit the first side channel occupied by the first side channel within the first time range. The total duration is less than or equal to the threshold f. Alternatively, it may only be required that the total number of times the first communication device transmits the first side channel within the first time range is less than or equal to the threshold e. Alternatively, it may only be required that the total time occupied by the first side channel transmitted by the first communication device within the first time range is less than or equal to the threshold f.

For example, the first sidelink channel is the sidelink synchronization signal (S-SSB) in Figure 13. For this S-SSB, its synchronization period is 160ms. In the example of Figure 13, 2 sets of synchronization resources are configured in each synchronization cycle, and each set of synchronization resources includes 4 synchronization time slots (ie, 4 SSB transmission opportunities). Since the first communication device only uses one of the two sets of synchronization resources to send S-SSB, in the synchronization period of 160 ms, the first communication device sends S-SSB four times in total. If the SCS size of the sidelink system is 15kHz (the duration of a time slot is 1ms), the S-SSB occupies all time domain symbols except the last time domain symbol in a time slot. When the SCS is 15kHz, the duration corresponding to the last time domain symbol is 71.36μs. Therefore, the duration of an S-SSB is: 1000-71.36=928.64μs. If the first time range is 50ms, the threshold f is 2500μs, and if the 50ms range includes no more than 2 S-SSB time slots, the SCSt method can be used for channel access, otherwise the SCSt method cannot be used for channel access. . When the SCS is 15kHz, a set of synchronization resources only includes one synchronization time slot, that is, the communication device will only have one time slot for sending S-SSB within a 160ms period. Therefore, within a 160ms period, S-SSB will not occupy more than 2500μs. Similarly, when the SCS is 30kHz, although a set of synchronization resources can include up to two synchronization slots, the duration of each synchronization slot is half that of the 15kHz subcarrier spacing, so the duration occupied by S-SSB will not more than 2500μs. When the SCS is 60kHz, although a set of synchronization resources can include up to 4 synchronization slots, the duration of each synchronization slot is one-quarter of the 15kHz subcarrier spacing, so the duration occupied by S-SSB will not more than 2500μs. Therefore, S-SSB transmission can meet the conditions of SCSt mode.

For another example, the first sidelink channel may be a PSFCH with a cycle of 4 time slots, that is, one time slot in every 4 time slots contains a PSFCH transmission resource (hereinafter, this time slot will be referred to as a PSFCH time slot for short). When the SCS is 30 kHz, the above-mentioned first time range includes 100 time slots, and the number of PSFCH time slots included in the first time range is 25. As can be seen from Figure 9B, PSFCH occupies 2 time domain symbols in each time slot. Therefore, for a 30kHz SCS sidelink system, one PSFCH occupies 71.36us. If the threshold f is 2500μs, the communication equipment even in each PSFCH time slot The total time occupied by sending PSFCH is 25*71.36μs=1784μs, and it does not exceed the threshold f, so the SCSt method can be used for channel access.

For another example, the first sidelink channel may be a PSFCH with a cycle of 2 time slots, that is, one time slot in every two time slots includes a PSFCH transmission resource (or, in other words, each time slot is a PSFCH time slot). When the SCS is 30 kHz, the above-mentioned first time range includes 100 time slots, and the number of PSFCH time slots included in the first time range is 50. As can be seen from Figure 9B, PSFCH occupies 2 time domain symbols in each time slot. For a 30kHz SCS sidelink system, one PSFCH occupies 71.36us. If the threshold f is 2500μs, if the communication device sends PSFCH in each PSFCH time slot , the total time occupied is 50*71.36μs=3568μs, which will exceed the threshold f. Therefore, before each transmission of PSFCH, the communication device needs to determine whether the total duration of PSFCH sent in 100 time slots including the current time slot exceeds the threshold f. If not, the SCSt method can be used for channel access. Otherwise, The current transmission cannot use SCSt mode for channel access.

In some embodiments, the first information further includes whether the current transmission opportunity is the last transmission opportunity of the first side channel. In step S1620, the first communication device determines whether to transmit the first sidelink channel on the shared spectrum through the first channel access mode, including: if the current transmission opportunity is the last transmission opportunity of the first sidelink channel, the first communication device The device transmits the first sidelink channel on the shared spectrum through the first channel access method; if the current transmission opportunity is not the last transmission opportunity for the first sidelink channel, the first communication device determines whether the first sidelink channel is shared through the first channel access method. The first side channel is transmitted on the spectrum.

For example, the first communication device determines whether to transmit the first sidelink channel on the shared spectrum through the first channel access method based on whether the current transmission opportunity is the last transmission opportunity of the first sidelink channel. If the current transmission opportunity is the last transmission opportunity of the first sidelink channel, the first communication device transmits the first sidelink channel on the shared spectrum through the first channel access method; if the current transmission opportunity is not the last transmission opportunity of the first sidelink channel For a transmission opportunity, the first communication device may determine whether to transmit the first sidelink channel on the shared spectrum through the first channel access mode according to the first condition described above.

In some embodiments, the first sidelink channel corresponds to M time domain transmission opportunities. In step S1620, if the channel access result of the second channel access method indicates channel access failure or the channel is busy, if the current transmission opportunity is For the last transmission opportunity among the M time domain transmission opportunities, the first communication device transmits the first side channel on the shared spectrum through the first channel access method. In some embodiments, the first communication device transmits the first sidelink channel at most once in the M time domain transmission opportunities. In some embodiments, the first channel access method includes a Type 2C channel access method or a SCSt transmission method. For example, the first sidelink channel is the PSFCH, or the first sidelink channel corresponds to the PSFCH in the sidelink feedback mode that only feeds back NACK. The PSFCH includes M1 time domain transmission opportunities, that is, for the PSSCH, its associated PSFCH includes M1 Time domain transmission opportunities, the sending end of PSFCH can transmit PSFCH in these M1 time domain transmission opportunities. If the current transmission opportunity corresponds to the last transmission opportunity among the M1 time domain transmission opportunities, the first communication device accesses the channel to transmit the PSFCH through the type 2C method, or uses the SCSt transmission method to transmit the PSFCH, so that the PSFCH Able to be transmitted at the last transmission opportunity. For another example, the first sidelink channel is S-SSB, and the S-SSB includes M2 time domain transmission opportunities, that is, a set of synchronization resources within one S-SSB cycle includes M2 time domain transmission opportunities. In step S1620, if the channel access result of the second channel access method indicates channel access failure or the channel is busy, and if the current transmission opportunity corresponds to the last transmission opportunity among the M2 time domain transmission opportunities, the first communication The device accesses the channel in Type 2C to transmit the S-SSB, or uses the SCSt transmission method to transmit the S-SSB, so that the S-SSB can be transmitted in the last transmission opportunity. M, M1 and M2 mentioned above are all positive integers. For example, M, M1 and M2 can all be positive integers greater than 1.

Embodiment 3: The first information includes indication information of the channel access mode

In some embodiments, if the first information includes indication information of the channel access mode, it may be determined based on the first information whether to transmit the first side channel through the first channel access mode.

In some embodiments, the indication information may be included in preconfiguration information or configuration information of the network device.

In some embodiments, the indication information is determined based on the indication information sent by the second communication device. The second communication device may be a communication device that initiates COT sharing, or the second communication device is a communication device that sends PSSCH, which is a PSSCH associated with PSFCH.

In some embodiments, the indication information may instruct the first communication device to use one of methods A to D to perform channel access. Method A instructs the first communication device to first determine whether channel access can be performed through the first channel access method. If channel access cannot be performed through the first channel access method, then determine whether channel access can be performed through the second channel access method. access. Method B instructs the first communication device to first determine whether channel access can be performed through the second channel access method. If channel access cannot be performed through the second channel access method, then determine whether channel access can be performed through the first channel access method. access. Method C instructs the first communication device to perform channel access through the first channel access method (or the first communication device only performs channel access through the first channel access method). Method D instructs the first communication device to perform channel access through the second channel access method (or the first communication device only performs channel access through the second channel access method).

Embodiment 4: The first information includes the sidelink priority of the first sidelink channel

In some embodiments, if the sidelink priority value of the first sidelink channel is less than or equal to the threshold g, the first communication device transmits the first sidelink channel through the first sidelink transmission mode. If the sidelink priority value of the first sidelink channel is less than or equal to the threshold g, it can be considered that the sidelink priority of the first sidelink channel is higher. In order to ensure the transmission success rate of this type of first sidelink channel, the first channel access method (that is, a channel access method that does not require listening, such as SCSt) can be used for transmission to reduce the cost of transmission. This type of first sidelink channel cannot be transmitted due to failure in listening, thereby ensuring the transmission success rate of the first sidelink channel with a higher sidelink priority.

In some embodiments, the above threshold g may be determined based on one or more of the following: sidelink priority, CBR, and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. The channel access priority of the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or configuration information of the network device. As an example, the PSFCH may be specified by the protocol to have the highest or lowest channel access priority. As another example, the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH. In some embodiments, the above threshold g may also be determined based on preconfiguration information or configuration information of the network device.

In some embodiments, if the sidelink priority value of the first sidelink channel is greater than or equal to the threshold g, the first communication device transmits the first sidelink channel through the first sidelink transmission mode. If the sidelink priority value of the first sidelink channel is greater than or equal to the threshold g, it can be considered that the sidelink priority of the first sidelink channel is low. The PSFCH with lower sidelink priority usually has lower requirements for transmission reliability, so the first sidelink channel can be sent directly without listening to the busyness of the channel to reduce the complexity of the communication process.

Embodiment 5: The first information includes whether the current transmission opportunity is the last transmission opportunity of the first side channel

In some embodiments, if the current transmission opportunity is the last transmission opportunity of the first sidelink channel, the first communication device transmits the first sidelink channel on the shared spectrum through the first channel access mode.

In some embodiments, if the current transmission opportunity is not the last transmission opportunity of the first sidelink channel, the first communication device does not transmit the first sidelink channel on the shared spectrum through the first channel access mode. Alternatively, if the current transmission opportunity is not the last transmission opportunity of the first side channel, the first communication device may transmit the first side channel on the shared spectrum through any one of the implementation methods in Embodiment 1 to Embodiment 4.

In some embodiments, the first sidelink channel includes S-SSB or PSFCH.

In some embodiments, the first sidelink channel corresponds to the PSFCH in a sidelink feedback mode that only feeds back NACK.

In some embodiments, the first sidelink channel corresponds to M time domain transmission opportunities. If the current transmission opportunity is the last transmission opportunity among the M time domain transmission opportunities, the first communication device uses the first channel access method to The first sidelink channel is transmitted on the shared spectrum. In some embodiments, the first communication device transmits the first sidelink channel at most once in the M time domain transmission opportunities. In some embodiments, the first channel access method includes a Type 2C channel access method or a SCSt transmission method. For example, the first sidelink channel is a PSFCH, or the first sidelink channel corresponds to a PSFCH in a sidelink feedback mode that only feeds back NACK. The PSFCH may include M1 time domain transmission opportunities. That is to say, for PSSCH, its associated PSFCH includes M1 time domain transmission opportunities, and the sending end of the PSFCH can transmit PSFCH in the M1 time domain transmission opportunities. If the current transmission opportunity corresponds to the last transmission opportunity among the M1 time domain transmission opportunities, the first communication device accesses the channel to transmit the PSFCH through the type 2C method, or uses the SCSt transmission method to transmit the PSFCH, so that the PSFCH Able to be transmitted at the last transmission opportunity. For another example, the first sidelink channel is S-SSB, and the S-SSB includes M2 time domain transmission opportunities, that is, a set of synchronization resources within one S-SSB cycle includes M2 time domain transmission opportunities. If the current transmission opportunity corresponds to the last transmission opportunity among the M2 time domain transmission opportunities, then the first communication device accesses the channel to transmit the S-SSB in the type 2C manner, or transmits the S-SSB in the SCSt transmission manner, Thus, the S-SSB can be transmitted in the last transmission opportunity. M, M1 and M2 mentioned above are all positive integers. For example, M, M1 and M2 can all be positive integers greater than 1.

Referring to Figure 17, the first sidelink channel is PSFCH. One PSSCH is associated with three PSFCH transmission opportunities. The three PSFCH transmission opportunities corresponding to the PSSCH in time slot a are located in time slot b, time slot c and time slot d respectively. Since time slot b and time slot c are not the last transmission opportunities of PSFCH, the first channel access method cannot be used to transmit PSFCH. In the figure, LBT needs to be performed before the PSFCH transmission of time slot b and time slot c. If LBT fails , then PSFCH cannot be transmitted. The PSFCH in time slot d corresponds to the last transmission opportunity of PSFCH. Therefore, the first channel access mode can be used to transmit the PSFCH, that is, LBT is not required and the PSFCH is directly transmitted. As shown in the figure, in time slot d There is no LBT before the PSFCH of slot d; alternatively, LBT is also done before the PSFCH transmission in slot d, but the PSFCH is transmitted even if the LBT fails or the channel is detected to be busy.

Embodiment 6: The first information includes the priority corresponding to the first side channel

In some embodiments, if the value of the priority corresponding to the first sidelink channel is less than or equal to the threshold h, the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access method.

In some embodiments, if the value of the priority corresponding to the first sidelink channel is greater than the threshold h, the first communication device determines not to transmit the first sidelink channel through the first channel access mode.

The first sidelink channel whose corresponding priority value is less than or equal to the threshold h may be considered as the corresponding sidelink channel with a higher priority. In order to ensure the transmission success rate of this type of sidelink channel, the first channel access method (that is, a channel access method that does not require listening, such as SCSt) can be used for transmission to reduce the risk of listening failure. This results in the inability to send such sidelink channels, thereby ensuring the success rate of sending sidelink channels with higher sidelink priority.

In some embodiments, the above threshold h may be determined based on one or more of the following: sidelink priority, CBR, and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. As an example, the PSFCH may be specified by the protocol to have the highest or lowest channel access priority. As another example, the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH.

In some embodiments, if the priority value corresponding to the first sidelink channel is greater than or equal to the threshold i, the first communication device transmits the first sidelink channel on the shared spectrum through the first channel access method. The first sidelink channel whose corresponding priority value is greater than or equal to the threshold i can be considered as the corresponding sidelink channel with a lower priority. Sidelink channels with lower priority usually have lower transmission reliability requirements. Therefore, such sidelink channels can be sent directly without listening to the busyness of the channel to reduce the complexity of the communication process.

In some embodiments, the above threshold i may be determined based on one or more of the following: sidelink priority, CBR, and channel access priority. The sidelink priority is, for example, the sidelink priority corresponding to the first sidelink channel, and the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel. When the first sidelink channel is PSFCH, the sidelink priority is the sidelink priority corresponding to PSFCH, and the channel access priority is the channel access priority corresponding to PSFCH. The channel access priority corresponding to the PSFCH may be determined, for example, based on protocol predefined information, preconfiguration information, or network device configuration information, or based on the channel access priority of the PSSCH associated with the PSFCH. The channel access priority of PSSCH can be determined based on PQI. Alternatively, in some embodiments, the above threshold i may also be determined based on preconfiguration information or configuration information of the network device.

The first sidelink channel may correspond to one or more OFDM symbols.

In some embodiments, the first communication device performs transmission for a first duration before the first OFDM symbol corresponding to the first sidelink channel.

In some embodiments, the first communication device performs the transmission of the first duration after the last OFDM symbol corresponding to the first sidelink channel.

In some embodiments, the difference between the duration corresponding to one OFDM symbol and the first duration is less than or equal to the threshold j.

In some embodiments, the above threshold j may satisfy one or more of the following: greater than or equal to 25 μs; equal to 16 μs; less than or equal to 16 μs.

In some embodiments, the above threshold j is determined based on one of the following information: protocol predefined information, preconfiguration information, configuration information of the network device, or instruction information sent by the second communication device, where the second communication device It is the communication device that initiates COT sharing, or the second communication device is the communication device that sends PSSCH, which is the PSSCH associated with PSFCH.

In some embodiments, the above-mentioned first duration is used to transmit data including data determined based on one or more of the following: cyclic prefix extension (CPE), any orthogonal frequency corresponding to the first sidelink channel Data, redundant bits and stuffing bits on OFDM symbols are multiplexed.

In some embodiments, if the first communication device performs a transmission of a first duration before the first OFDM symbol corresponding to the first sidelink channel, or if the first communication device performs a transmission before the last OFDM symbol corresponding to the first sidelink channel, The symbol is followed by transmission of the first duration, and the duration occupied by the first sidelink channel includes the sum of the total duration of the OFDM symbols corresponding to the first sidelink channel and the first duration. For example, in the above-mentioned Embodiment 2.3, if the first communication device performs a transmission of a first duration before the first OFDM symbol corresponding to the first sidelink channel, then it is determined that the first communication device transmits within the first time range. When referring to the total duration occupied by the first sidelink channel, the duration occupied by each first sidelink channel includes the total duration of the OFDM symbol corresponding to the first sidelink channel and the sum of the first duration.

In some embodiments, the second information is used to indicate whether transmission of the first sidelink channel through the first channel access method is supported, or the second information is used to indicate whether the first channel access method is supported. In some embodiments, the second information is resource pool configuration information or sidelink bandwidth part (BWP) configuration information. In some embodiments, the second information is obtained according to preconfiguration information or network configuration information. In some embodiments, the value of the second information is the first value (for example, the first value is 1, "TRUE", "enable"), or the second information is configured, indicating that the transmission of the second information through the first channel access method is supported. One side channel, or support the first channel access method. In some embodiments, the value of the second information is a second value (for example, the second value is 0, "FALSE", "disable"), or the second information is not configured, indicating that transmission through the first channel access method is not supported. The first sidelink channel, or the first channel access method is not supported. For example, if the resource pool configuration information includes the second information, and the second information has a value of 0, it means that the first channel access method is not supported, and the first communication device cannot transmit the first side through the first channel access method. line transmission channel.

In some embodiments, before determining whether to transmit the first side channel on the shared spectrum through the first channel access method based on the first information, the first communication device may first make a determination based on the second information, and perform the judgment based on the second information. When the first communication device is instructed to support the first channel access mode, or the second information indicates that the first communication device supports transmission of the first side channel through the first channel access mode, it is then determined based on the first information whether to transmit the first side channel through the first channel access mode. The channel access method transmits the first side channel on the shared spectrum.

In some embodiments, if the first communication device determines to transmit the first side channel on the shared spectrum through the first channel access method according to the first information, but the second information indicates that the first communication device does not support the first channel access method, or the second information indicates that the first communication device does not support transmitting the first sidelink channel through the first channel access method, then the first communication device does not transmit the first sidelink channel on the shared spectrum through the first channel access method. .

In some embodiments, the structure of the PSFCH mentioned in the previous embodiments may have the following characteristics: the PSFCH occupies two OFDM symbols in the time domain, where the two OFDM symbols may be the penultimate ones in a time slot. and the third to last OFDM symbol available for sideline transmission. Further, the sidelink feedback information carried by the PSFCH is carried through the first sequence. The first sequence has a length of L and is mapped to 1 PRB; or is mapped to 1 IRB when the first sequence is mapped to the IRB. , the same sequence can be mapped on different PRBs included in the IRB, that is, the first sequence can be mapped, or the second sequence can be mapped, where the second sequence is generated based on the first sequence or determined based on the first sequence, Furthermore, different second sequences can be mapped on different PRBs corresponding to the IRB. For example, the second sequence is determined based on the first sequence and phase offset, and the second sequences on different PRBs may correspond to different phase offsets. Wherein, L is a positive integer, for example, L=12, or L is determined according to the number of PRBs or subcarriers included in the IRB.

It should be noted that "less than or equal to" in various embodiments of this application may include only less than, only equal to, or both less than and equal to. Similarly, "greater than or equal to" in various embodiments of this application may include only greater than, only equal to, or both greater than and equal to.

The method embodiments of the present application are described in detail above with reference to FIGS. 1 to 16 , and the device embodiments of the present application are described in detail below with reference to FIGS. 17 to 18 . It should be understood that the description of the method embodiments corresponds to the description of the device embodiments. Therefore, the parts not described in detail can be referred to the previous method embodiments.

Figure 17 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication device 1700 of Figure 17 may correspond to the first communication device mentioned above. The communication device 1700 may include a determination module 1710. The determination module 1710 may be used to determine whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first information; wherein the first information includes one or more of the following: the first The type of sidelink channel; the channel access result of the second channel access method; the priority corresponding to the first sidelink channel; and the indication information of the channel access method; wherein, the first channel access method The channel access method is to not listen to the shared spectrum before transmitting the first side channel on the shared spectrum; the second channel access method is to transmit the first side channel on the shared spectrum. The channel access method of listening to the shared spectrum before operating the channel.

Optionally, in some embodiments, the first information includes a type of a first side channel, and the determining module 1710 is configured to determine if the first side channel is a channel of the first type. The first channel access method transmits the first side channel.

Optionally, in some embodiments, the first type of channel includes S-SSB and/or PSFCH.

Optionally, in some embodiments, the first type of channel includes a PSFCH corresponding to a first sidelink feedback mode, wherein the first sidelink feedback mode is to feedback only NACK.

Optionally, in some embodiments, transmitting the PSFCH corresponding to the first sidelink feedback mode through the first channel access mode is determined based on one of the following information: protocol predefined information, preconfiguration information, Configuration information of the network device or indication information of the second communication device, wherein the second communication device is a communication device that initiates COT sharing, or the second communication device is a communication device that sends PSSCH, and the PSSCH is the communication device associated with The PSSCH associated with the PSFCH.

Optionally, in some embodiments, the priority value corresponding to the PSFCH is less than or equal to the first threshold (corresponding to the threshold a mentioned above).

Optionally, in some embodiments, the first threshold is determined based on one or more of the following: sidelink priority, CBR, and channel access priority; or, the first threshold is based on preset Configuration information or network device configuration information is determined.

Optionally, in some embodiments, the communication device performs a first duration transmission before the first OFDM symbol corresponding to the first sidelink channel, wherein the duration corresponding to one OFDM symbol is the same as the first OFDM symbol. The difference between the durations is less than or equal to the second threshold.

Optionally, in some embodiments, the second threshold meets one or more of the following: greater than or equal to 25 μs; equal to 16 μs; less than or equal to 16 μs.

Optionally, in some embodiments, the second threshold (corresponding to the threshold h in the preceding paragraph) is determined based on one of the following information: protocol predefined information, preconfiguration information, network device configuration information, or Instruction information sent by a second communication device, wherein the second communication device is a communication device that initiates COT sharing, or the second communication device is a communication device that sends PSSCH, and the PSSCH is associated with the PSFCH PSSCH.

Optionally, in some embodiments, the first duration is used to transmit data including data determined based on one or more of the following: CP extension, any OFDM symbol corresponding to the first sidelink channel data, redundant bits, and padding bits.

Optionally, in some embodiments, the first information includes the channel access result of the second channel access method, and the determining module 1710 is configured to determine if the channel access result of the second channel access method is If the result indicates that the channel access is successful or the channel is idle, the first sidelink channel is transmitted on the shared spectrum according to the channel access result of the second channel access method.

Optionally, in some embodiments, the first information includes the channel access result of the second channel access method, and the determining module 1710 is configured to determine if the channel access result of the second channel access method is If the result indicates that channel access fails or the channel is busy, it is determined whether to transmit the first sidelink channel on the shared spectrum through the first channel access method.

Optionally, in some embodiments, the determining module 1710 is configured to, if the channel access result of the second channel access method indicates channel access failure or the channel is busy, determine whether to pass the first condition according to the first condition. The first channel access method transmits the first sidelink channel on the shared spectrum; wherein the first condition is associated with one or more of the following information: the priority corresponding to the first sidelink channel level; the total number of times the communication device transmits the first side channel through the first channel access method within the first time range; and the communication device transmits the first side channel through the first time range The total duration occupied by the first sidelink channel transmitted in the access mode.

Optionally, in some embodiments, the first condition is associated with the priority corresponding to the first sidelink channel, and the determining module 1710 is configured to determine if the priority corresponding to the first sidelink channel is selected. If the value is less than or equal to the third threshold (corresponding to the threshold c mentioned above), it is determined that the first side channel is transmitted on the shared spectrum through the first channel access method.

Optionally, in some embodiments, the third threshold is determined based on one or more of the following: sidelink priority, CBR, and channel access priority; or, the third threshold is based on predetermined Configuration information or network device configuration information is determined.

Optionally, in some embodiments, the first condition is associated with the total number of times the communication device transmits the first sidelink channel through the first channel access method within the first time range, The determination module 1710 is configured to determine that the first channel is transmitted on the shared spectrum through the first channel access mode if the total number of times is less than or equal to a fourth threshold (corresponding to the threshold e in the previous paragraph). Sidelink channel; if the total number of times is greater than the fourth threshold, it is determined not to transmit the first sidelink channel on the shared spectrum through the first channel access mode.

Optionally, in some embodiments, the fourth threshold is determined based on one or more of the following: sidelink priority, CBR, and channel access priority; or, the fourth threshold is based on preconfiguration information Or the configuration information of the network device is determined.

Optionally, in some embodiments, the first condition is related to the total amount of time occupied by the first sidelink channel transmitted by the communication device through the first channel access method within the first time range. Duration correlation, the determination module 1710 is configured to determine that if the total duration is less than or equal to the fifth threshold (corresponding to the threshold f in the previous paragraph), the information transmitted on the shared spectrum is transmitted through the first channel access method. The first sidelink channel; if the total duration is greater than the fifth threshold, it is determined not to transmit the first sidelink channel on the shared spectrum through the first channel access method.

Optionally, in some embodiments, the fifth threshold is determined based on one or more of the following: sidelink priority, CBR, and channel access priority; or, the fifth threshold is based on preconfiguration information Or the configuration information of the network device is determined.

Optionally, in some embodiments, the first time range includes a time slot [nT _start , nT _end ], where T _end =1; T _start =T ₁ ·2 ^μ ; or, the first time range Including time slots [nT _start , nT _end ], where T _end =0; T _start =T ₁ ·2 ^μ -1; where n represents the time slot corresponding to the first sidelink channel, and T ₁ represents the first sidelink channel The duration corresponding to a time range, μ represents a parameter determined based on the size of the sidelink subcarrier spacing.

Optionally, in some embodiments, the first information includes indication information of the channel access method, and the indication information instructs the communication device to use one of the following methods to perform channel access: first determine whether Channel access can be performed through the first channel access method. If channel access cannot be performed through the first channel access method, it is determined whether channel access can be performed through the second channel access method; first Determine whether channel access can be performed through the second channel access method; if channel access cannot be performed through the second channel access method, determine whether channel access can be performed through the first channel access method ; Perform channel access through the first channel access method; and perform channel access through the second channel access method.

Optionally, in some embodiments, the first information includes the priority corresponding to the first sidelink channel, and the determining module 1710 is used to determine if the value of the priority corresponding to the first sidelink channel is is less than or equal to the sixth threshold (corresponding to the threshold h above), then the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access mode; and if If the priority value corresponding to the first sidelink channel is greater than the sixth threshold, the first communication device determines not to transmit the first sidelink channel through the first channel access mode.

Optionally, in some embodiments, the first information includes whether the current transmission opportunity is the last transmission opportunity of the first sidelink channel, and the determining module 1710 is configured to if the current transmission opportunity is The last transmission opportunity of the first sidelink channel is to transmit the first sidelink channel on the shared spectrum through the first channel access mode.

Optionally, in some embodiments, the second channel access method includes one or more of the following: type 1 channel access, type 2A channel access, and type 2B channel access.

Optionally, in some embodiments, the first channel access method includes a short control signaling transmission method or a Type 2C channel access method.

Figure 18 is a schematic structural diagram of the device according to the embodiment of the present application. The dashed line in Figure 18 indicates that the unit or module is optional. The device 1800 can be used to implement the method described in the above method embodiment. The device 1800 may be a chip or a communication device (such as a terminal device).

Apparatus 1800 may include one or more processors 1810. The processor 1810 can support the device 1800 to implement the method described in the foregoing method embodiments. The processor 1810 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor can also be another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an off-the-shelf programmable gate array (FPGA) Or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

Apparatus 1800 may also include one or more memories 1820. The memory 1820 stores a program, which can be executed by the processor 1810, so that the processor 1810 executes the method described in the foregoing method embodiment. The memory 1820 may be independent of the processor 1810 or integrated in the processor 1810.

Apparatus 1800 may also include a transceiver 1830. Processor 1810 may communicate with other devices or chips through transceiver 1830. For example, the processor 1810 can transmit and receive data with other devices or chips through the transceiver 1830.

An embodiment of the present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied in the communication device provided by the embodiments of the present application, and the program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

An embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied in the communication device provided by the embodiments of the present application, and the program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

An embodiment of the present application also provides a computer program. The computer program can be applied to the communication device provided by the embodiments of the present application, and the computer program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

It should be understood that in the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. But it should also be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and/or other information.

It should be understood that the term "and/or" in this article is only an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and B exist simultaneously. , there are three situations of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

It should be understood that in the various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

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

It should be understood that in the embodiments of this application, the term "correspondence" can mean that there is a direct correspondence or indirect correspondence between the two, or it can also mean that there is an associated relationship between the two, or it can also mean indicating and being instructed, configuration and Be configured and so on.

It should be understood that in the embodiments of this application, "predefinition" or "preconfiguration" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). Implementation, this application does not limit its specific implementation method. For example, predefined can refer to what is defined in the protocol.

It should be understood that in the embodiments of this application, the "protocol" may refer to a standard protocol in the communication field, which may include, for example, LTE protocol, NR protocol, and related protocols applied in future communication systems. This application does not limit this.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

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

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center integrated with one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVD)) or semiconductor media (e.g., solid state disks (SSD) )wait.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method of wireless communication, characterized by including:

The first communication device determines whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first information;

Wherein, the first information includes one or more of the following:

The type of the first side channel;

Channel access results of the second channel access method;

The priority corresponding to the first sidelink channel;

Instructions for channel access methods; and

Whether the current transmission opportunity is the last transmission opportunity of the first side channel;

Wherein, the first channel access method is a channel access method of not listening to the shared spectrum before transmitting the first side channel on the shared spectrum; the second channel access method is a channel access method of not listening to the shared spectrum before transmitting the first side channel on the shared spectrum. A channel access method of listening to the shared spectrum before transmitting the first sidelink channel on the shared spectrum.
The method according to claim 1, characterized in that the first information includes the type of the first side channel, and the first communication device determines whether to use the first channel access mode on the shared spectrum based on the first information. Transmit the first side channel, including:

If the first side channel is a first type of channel, the first communication device determines to transmit the first side channel through the first channel access mode.
The method according to claim 2, characterized in that the first type of channel includes a sidelink synchronization signal block S-SSB and/or a physical sidelink feedback channel PSFCH.
The method according to claim 2, characterized in that the first type of channel includes a PSFCH corresponding to a first sidelink feedback mode, wherein the first sidelink feedback mode is to feedback only negative acknowledgment NACK.
The method according to claim 4, characterized in that, transmitting the PSFCH corresponding to the first sidelink feedback mode through the first channel access mode is determined based on one of the following information: protocol predefined information, preset Configuration information, configuration information of a network device, or instruction information of a second communication device, wherein the second communication device is a communication device that initiates channel occupancy time COT sharing, or the second communication device sends physical sideline sharing A communication device that channels PSSCH, which is the PSSCH associated with the PSFCH.
The method according to any one of claims 3-5, characterized in that the priority value corresponding to the PSFCH is less than or equal to the first threshold.
The method according to claim 6, characterized in that:

The first threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The first threshold is determined based on preconfiguration information or configuration information of the network device.
The method according to any one of claims 3-7, characterized in that the first communication device performs the first orthogonal frequency division multiplexing OFDM symbol corresponding to the first sidelink channel. Duration transmission, wherein the difference between the duration corresponding to one OFDM symbol and the first duration is less than or equal to the second threshold.
The method of claim 8, wherein the second threshold meets one or more of the following:

Greater than or equal to 25μs;

equal to 16μs;

Less than or equal to 16μs.
The method according to claim 8 or 9, characterized in that the second threshold is determined based on one of the following information: protocol predefined information, preconfiguration information, configuration information of a network device or a second communication device The instruction information sent, wherein the second communication device is a communication device that initiates COT sharing, or the second communication device is a communication device that sends PSSCH, and the PSSCH is the PSSCH associated with the PSFCH.
The method according to any one of claims 8-10, characterized in that the first duration is used for transmitting data determined based on one or more of the following: cyclic prefix CP extension, the first Data, redundant bits and stuffing bits on any OFDM symbol corresponding to the side channel.
The method according to claim 1, characterized in that the first information includes a channel access result of the second channel access mode, and the first communication device determines whether to access through the first channel based on the first information. The first sidelink channel is transmitted on the shared spectrum in the input mode, including:

If the channel access result of the second channel access method indicates that the channel access is successful or the channel is idle, the first communication device determines whether the channel access result of the second channel access method is on the shared spectrum according to the channel access result of the second channel access method. Transmitting the first side channel.
The method according to claim 1 or 12, characterized in that the first information includes a channel access result of the second channel access mode, and the first communication device determines whether to pass the first channel access method according to the first information. The channel access method transmits the first side channel on the shared spectrum, including:

If the channel access result of the second channel access method indicates that the channel access fails or the channel is busy, the first communication device determines whether to transmit the shared spectrum through the first channel access method. First side channel.
The method according to claim 13, characterized in that if the channel access result of the second channel access mode indicates that the channel access fails or the channel is busy, the first communication device determines whether to pass the The first channel access method transmits the first side channel on the shared spectrum, including:

If the channel access result of the second channel access method indicates that the channel access fails or the channel is busy, the first communication device determines whether to use the first channel access method to access the shared spectrum according to the first condition. Transmitting the first sidelink channel;

Wherein, the first condition is associated with one or more of the following information:

The priority corresponding to the first sidelink channel;

The total number of times the first communication device transmits the first side channel through the first channel access method within a first time range; and

The total time occupied by the first sidelink channel transmitted by the first communication device through the first channel access method within the first time range.
The method of claim 14, wherein the first condition is associated with a priority corresponding to the first side channel, and the first communication device determines whether to pass the first channel according to the first condition. The access method transmits the first side channel on the shared spectrum, including:

If the priority value corresponding to the first sidelink channel is less than or equal to a third threshold, the first communication device determines to transmit the first signal on the shared spectrum through the first channel access mode. Side channel.
The method according to claim 15, characterized in that:

The third threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The third threshold is determined based on preconfiguration information or configuration information of the network device.
The method according to claim 14, characterized in that the first condition is related to the first communication device transmitting the first side channel through the first channel access mode within the first time range. The total number of associations,

The first communication device determines whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first condition, including:

If the total number of times is less than or equal to a fourth threshold, the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access mode;

If the total number of times is greater than the fourth threshold, the first communication device determines not to transmit the first side channel on the shared spectrum through the first channel access mode.
The method according to claim 17, characterized in that:

The fourth threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The fourth threshold is determined based on preconfiguration information or configuration information of the network device.
The method according to claim 14, characterized in that the first condition is related to the first sideline transmitted by the first communication device through the first channel access mode within the first time range. The total duration occupied by the channel is associated,

The first communication device determines to transmit the first side channel on the shared spectrum through the first channel access method according to the first condition, including:

If the total duration is less than or equal to the fifth threshold, the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access mode;

If the total duration is greater than the fifth threshold, the first communication device determines not to transmit the first side channel on the shared spectrum through the first channel access mode.
The method according to claim 19, characterized in that:

The fifth threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The fifth threshold is determined based on preconfiguration information or configuration information of the network device.
The method according to any one of claims 14-20, characterized in that:

The first time range includes time slots [nT start , nT end ], where T end =1; T start =T 1 ·2 μ ; or,

The first time range includes time slots [nT start , nT end ], where T end =0; T start =T 1 ·2 μ -1;

Wherein, n represents the time slot corresponding to the first sidelink channel, T 1 represents the duration corresponding to the first time range, and μ represents a parameter determined based on the size of the sidelink subcarrier spacing.
The method according to claim 1, characterized in that the first information includes indication information of the channel access mode, and the indication information instructs the first communication device to use one of the following methods to perform channel access: enter:

First determine whether channel access can be performed through the first channel access method. If channel access cannot be performed through the first channel access method, then determine whether channel access can be performed through the second channel access method. enter;

First determine whether channel access can be performed through the second channel access method. If channel access cannot be performed through the second channel access method, then determine whether channel access can be performed through the first channel access method. enter;

Perform channel access through the first channel access method; and

Channel access is performed through the second channel access method.
The method according to claim 1, wherein the first information includes the priority corresponding to the first side channel,

The first communication device determines whether to transmit the first sidelink channel on the shared spectrum through the first channel access method according to the first information, including:

If the value of the priority corresponding to the first sidelink channel is less than or equal to the sixth threshold, the first communication device determines to transmit the first channel on the shared spectrum through the first channel access mode. side channels; and

If the value of the priority corresponding to the first sidelink channel is greater than the sixth threshold, the first communication device determines not to transmit the first sidelink channel through the first channel access mode.
The method according to any one of claims 1-23, wherein the first information includes whether the current transmission opportunity is the last transmission opportunity of the first side channel,

The first communication device determines whether to transmit the first sidelink channel on the shared spectrum through the first channel access method according to the first information, including:

If the current transmission opportunity is the last transmission opportunity of the first side channel, the first communication device transmits the first side channel on the shared spectrum through the first channel access mode. .
The method according to any one of claims 1-24, characterized in that the second channel access method includes one or more of the following: type 1 channel access, type 2A channel access and Type 2B channel access.
The method according to any one of claims 1 to 25, characterized in that the first channel access method includes a short control signaling transmission method or a type 2C channel access method.
A communication device, characterized by including:

Determining module, configured to determine whether to transmit the first side channel on the shared spectrum through the first channel access method according to the first information;

Wherein, the first information includes one or more of the following:

The type of the first side channel;

Channel access results of the second channel access method;

The priority corresponding to the first side channel; and

Instruction information of channel access mode;

Wherein, the first channel access method is a channel access method of not listening to the shared spectrum before transmitting the first side channel on the shared spectrum; the second channel access method is a channel access method of not listening to the shared spectrum before transmitting the first side channel on the shared spectrum. A channel access method of listening to the shared spectrum before transmitting the first sidelink channel on the shared spectrum.
The communication device according to claim 27, wherein the first information includes a type of a first side channel, and the determining module is configured to determine if the first side channel is a first type of channel. It is determined that the first sidelink channel is transmitted through the first channel access mode.
The communication device according to claim 28, wherein the first type of channel includes a sidelink synchronization signal block S-SSB and/or a physical sidelink feedback channel PSFCH.
The communication device according to claim 28, wherein the first type of channel includes a PSFCH corresponding to a first sidelink feedback mode, wherein the first sidelink feedback mode is to feed back only negative acknowledgment NACK.
The communication device according to claim 30, characterized in that, transmitting the PSFCH corresponding to the first sidelink feedback mode through the first channel access mode is determined based on one of the following information: protocol predefined information, Preconfiguration information, configuration information of a network device, or instruction information of a second communication device, wherein the second communication device is a communication device that initiates channel occupancy time COT sharing, or the second communication device sends a physical sideline Communication equipment sharing the channel PSSCH, which is the PSSCH associated with the PSFCH.
The communication device according to any one of claims 29 to 31, characterized in that the priority value corresponding to the PSFCH is less than or equal to the first threshold.
The communication device according to claim 32, characterized in that:

The first threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The first threshold is determined based on preconfiguration information or configuration information of the network device.
The communication device according to any one of claims 29 to 33, characterized in that the communication device performs a first duration operation before the first orthogonal frequency division multiplexing OFDM symbol corresponding to the first sidelink channel. transmission, wherein the difference between the duration corresponding to one OFDM symbol and the first duration is less than or equal to the second threshold.
The communication device according to claim 34, wherein the second threshold satisfies one or more of the following:

Greater than or equal to 25μs;

equal to 16μs;

Less than or equal to 16μs.
The communication device according to claim 34 or 35, characterized in that the second threshold is determined based on one of the following information: protocol predefined information, preconfiguration information, network device configuration information or second communication Instruction information sent by a device, wherein the second communication device is a communication device that initiates COT sharing, or the second communication device is a communication device that sends PSSCH, and the PSSCH is the PSSCH associated with the PSFCH.
The communication device according to any one of claims 34 to 36, characterized in that the first duration is used to transmit data including data determined based on one or more of the following: cyclic prefix CP extension, the third Data, redundant bits and stuffing bits on any OFDM symbol corresponding to a side row channel.
The communication device according to claim 27, characterized in that the first information includes a channel access result of the second channel access mode, and the determining module is used to determine if the second channel access mode If the channel access result indicates that the channel access is successful or the channel is idle, the first side channel is transmitted on the shared spectrum according to the channel access result of the second channel access method.
The communication device according to claim 27 or 38, characterized in that the first information includes a channel access result of the second channel access mode, and the determining module is used to determine if the second channel access If the channel access result of the mode indicates that the channel access fails or the channel is busy, it is determined whether to transmit the first sidelink channel on the shared spectrum through the first channel access mode.
The communication device according to claim 39, wherein the determining module is configured to determine whether the channel access result of the second channel access mode indicates a channel access failure or a busy channel according to the first condition. Transmitting the first side channel on the shared spectrum through the first channel access method;

Wherein, the first condition is associated with one or more of the following information:

The priority corresponding to the first sidelink channel;

The total number of times the communication device transmits the first side channel through the first channel access method within the first time range; and

The total time occupied by the first sidelink channel transmitted by the communication device through the first channel access method within the first time range.
The communication device according to claim 40, characterized in that the first condition is associated with a priority corresponding to the first side channel, and the determining module is configured to if the priority corresponding to the first side channel If the value of the level is less than or equal to the third threshold, it is determined that the first side channel is transmitted on the shared spectrum through the first channel access mode.
The communication device according to claim 41, characterized in that:

The third threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The third threshold is determined based on preconfiguration information or configuration information of the network device.
The communication device according to claim 40, characterized in that the first condition is related to the communication device transmitting the first side channel through the first channel access mode within the first time range. The total number of times is associated, and the determining module is configured to determine that the first sidelink channel is transmitted on the shared spectrum through the first channel access mode if the total number of times is less than or equal to a fourth threshold; if the If the total number of times is greater than the fourth threshold, it is determined not to transmit the first sidelink channel on the shared spectrum through the first channel access method.
The communication device according to claim 43, characterized in that:

The fourth threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The fourth threshold is determined based on preconfiguration information or configuration information of the network device.
The communication device according to claim 40, wherein the first condition is related to the first side channel transmitted by the communication device through the first channel access mode within the first time range. Associated with the total occupied time, the determining module is configured to determine to transmit the first side channel on the shared spectrum through the first channel access method if the total time is less than or equal to a fifth threshold. ; If the total duration is greater than the fifth threshold, it is determined not to transmit the first sidelink channel on the shared spectrum through the first channel access method.
The communication device according to claim 45, characterized in that:

The fifth threshold is determined based on one or more of the following: sidelink priority, channel busy rate and channel access priority; or,

The fifth threshold is determined based on preconfiguration information or configuration information of the network device.
The communication device according to any one of claims 40-46, characterized in that:

The first time range includes time slots [nT start , nT end ], where T end =1; T start =T 1 ·2 μ ; or,

The first time range includes time slots [nT start , nT end ], where T end =0; T start =T 1 ·2 μ -1;

Wherein, n represents the time slot corresponding to the first sidelink channel, T 1 represents the duration corresponding to the first time range, and μ represents a parameter determined based on the size of the sidelink subcarrier spacing.
The communication device according to claim 27, characterized in that the first information includes indication information of the channel access mode, and the indication information instructs the communication device to use one of the following methods to perform channel access. :

First determine whether channel access can be performed through the first channel access method. If channel access cannot be performed through the first channel access method, then determine whether channel access can be performed through the second channel access method. enter;

First determine whether channel access can be performed through the second channel access method. If channel access cannot be performed through the second channel access method, then determine whether channel access can be performed through the first channel access method. enter;

Perform channel access through the first channel access method; and

Channel access is performed through the second channel access method.
The communication device according to claim 27, wherein the first information includes a priority corresponding to the first side channel, and the determining module is configured to determine if the priority corresponding to the first side channel is less than or equal to the sixth threshold, then the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access mode; and if the first sidelink If the value of the priority corresponding to the channel is greater than the sixth threshold, the first communication device determines not to transmit the first side channel through the first channel access method.
The communication device according to any one of claims 27-49, wherein the first information includes whether the current transmission opportunity is the last transmission opportunity of the first side channel, and the determining module It is used to transmit the first side channel on the shared spectrum through the first channel access mode if the current transmission opportunity is the last transmission opportunity of the first side channel.
The communication device according to any one of claims 27-50, characterized in that the second channel access method includes one or more of the following: type 1 channel access, type 2A channel access and Type 2B channel access.
The communication device according to any one of claims 27 to 51, characterized in that the first channel access method includes a short control signaling transmission method or a type 2C channel access method.
A communication device, characterized in that it includes a memory and a processor, the memory is used to store a program, and the processor is used to call the program in the memory, so that the communication device executes the instructions in claims 1-26 any of the methods described.
A device, characterized by comprising a processor for calling a program from a memory, so that the device executes the method according to any one of claims 1-26.
A chip, characterized in that it includes a processor for calling a program from a memory, so that a device installed with the chip executes the method according to any one of claims 1-26.
A computer-readable storage medium, characterized in that a program is stored thereon, and the program causes the computer to execute the method according to any one of claims 1-26.
A computer program product, characterized by comprising a program that causes a computer to execute the method according to any one of claims 1-26.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1-26.