WO2023206145A1 - Procédé de communication sans fil et dispositif de communication - Google Patents

Procédé de communication sans fil et dispositif de communication Download PDF

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Publication number
WO2023206145A1
WO2023206145A1 PCT/CN2022/089576 CN2022089576W WO2023206145A1 WO 2023206145 A1 WO2023206145 A1 WO 2023206145A1 CN 2022089576 W CN2022089576 W CN 2022089576W WO 2023206145 A1 WO2023206145 A1 WO 2023206145A1
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channel
channel access
communication device
sidelink
information
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PCT/CN2022/089576
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English (en)
Chinese (zh)
Inventor
赵振山
张世昌
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Oppo广东移动通信有限公司
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Priority to PCT/CN2022/089576 priority Critical patent/WO2023206145A1/fr
Publication of WO2023206145A1 publication Critical patent/WO2023206145A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the present application relates to the field of communication technology, and more specifically, to a wireless communication method and communication device.
  • 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.
  • 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.
  • a communication device 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 ;
  • 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.
  • a communication device 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.
  • a chip 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.
  • 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.
  • 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.
  • 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.
  • the wireless communication system 100 may include one or more network devices 110 and/or one or more terminal devices 120 .
  • 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 .
  • 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.
  • 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.
  • network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the present application.
  • 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.
  • 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.
  • V2X vehicle-to-everything
  • D2D device-to-device communication
  • 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.
  • 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.
  • 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.
  • NodeB Node B
  • eNB evolved base station
  • next generation NodeB next generation NodeB, gNB
  • relay station Access point
  • 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.
  • 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.
  • a helicopter or drone may be configured to serve as a device that communicates with another base station.
  • 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 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.
  • sideline communication supports direct transmission of communication data between terminal devices.
  • direct transmission of communication data between terminal devices can have higher spectrum efficiency and lower transmission delay.
  • the Internet of Vehicles system uses side-travel communication technology.
  • 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.
  • FIG 2 is an example diagram of a side communication scenario within network coverage.
  • 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.
  • FIG 3 is an example diagram of a sidelink communication scenario with partial network coverage.
  • 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.
  • 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.
  • PSBCH physical sidelink broadcast channel
  • FIG 4 is an example diagram of a sidelink communication scenario outside network coverage.
  • both terminal devices 120b are located outside the network coverage.
  • both terminal devices 120b can determine the side row configuration according to the preconfiguration information.
  • sidelink communication can be performed on the sidelink link.
  • Figure 5 is an example diagram of a scenario for side communication based on a central control node.
  • 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.
  • Some standards or protocols (such as the 3rd Generation Partnership Project (3GPP)) define two modes of sideline communication: first mode and second mode.
  • the resources of the terminal device 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Some sideline communication systems support broadcast-based data transmission (hereinafter referred to as broadcast transmission).
  • the receiving terminal can be any terminal device around the sending terminal.
  • terminal device 1 is a sending terminal
  • 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.
  • 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).
  • unicast transmission hereinafter referred to as unicast transmission
  • multicast transmission hereinafter referred to as multicast transmission.
  • NR-V2X new radio vehicle to everything
  • autonomous driving places higher requirements on data interaction between vehicles.
  • 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.
  • 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
  • terminal device 2 may be a receiving terminal
  • terminal device 1 may be a receiving terminal
  • terminal device 2 may be a sending terminal.
  • 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.
  • 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.
  • 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.
  • 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.
  • PSFCH physical sidelink feedback channel
  • 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 ⁇ .
  • 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.
  • 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.
  • AGC automatic gain control
  • 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.
  • 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.
  • 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.
  • the sidelink feedback channel is introduced.
  • terminal device 1 the terminal device as the sending end
  • terminal device 2 the terminal device as the receiving end
  • the terminal device 2 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.
  • 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.
  • SCI sidelink control information
  • 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.
  • 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.
  • this sideline feedback method is usually related to the communication distance between terminal devices.
  • 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.
  • 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.
  • 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.
  • the ACK/NACK sidelink feedback method is adopted, each receiving terminal in the communication group can use different sidelink feedback resources.
  • the receiving terminal in the communication group can perform sideline feedback through frequency division multiplexing (FDM) or code division multiplexing (CDM).
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • a sidelink feedback resource (or PSFCH transmission resource) used to carry the PSFCH can be configured in one of every N time slots.
  • 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.
  • 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.
  • 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.
  • the terminal device 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.
  • synchronization transmission resources and sideline data transmission resources can be time-division multiplexed. (time-division multiplexing, TDM) method for transmission.
  • TDM time-division multiplexing
  • sideline systems usually do not support sideline synchronization signals and sideline data transmission in FDM.
  • 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.
  • the synchronization period of sideline synchronization resources is usually 160ms. Supports configuring 2 or 3 sets of synchronization resources in each synchronization cycle.
  • 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.
  • S-SSB sidelink synchronization signal block
  • 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.
  • DFN direct frame number
  • SFN system frame number
  • 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.
  • 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 ⁇ .
  • 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 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.
  • LBT listen before talk
  • COT channel occupancy time
  • MCOT maximum channel occupancy time
  • COT of network equipment such as base stations
  • COT of terminal equipment such as base stations
  • 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.
  • 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.
  • 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.
  • 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.
  • Some communication systems introduce channel access methods through LBT.
  • the communication system may also support channel access through short control signaling transmission (SCSt).
  • SCSt short control signaling transmission
  • LBT 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.
  • 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).
  • 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.
  • 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
  • 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.
  • 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).
  • the communication equipment can use single time slot detection of the 25us channel.
  • 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.
  • the communication equipment can use a single time slot of 16us for channel detection.
  • 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.
  • the communication device can directly transmit data through the channel without performing channel detection.
  • 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.
  • SCSt is a transmission in which the communication device does not sense the presence of other signals on the channel.
  • SCSt is a transmission used by communication devices to send management and control frames without sensing the presence of other signals on the channel.
  • SCSt is a transmission used by communication devices to send management and control frames without sensing the presence of other signals on the channel.
  • the communication device does not need to listen to the channel to access the channel for transmission.
  • certain conditions need to be met to adopt SCSt.
  • 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.
  • 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.
  • 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.
  • the first communication device may be any type of terminal device mentioned above.
  • 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.
  • the shared spectrum may be nationally and/or regionally allocated spectrum that may be used for communications by communication devices.
  • shared spectrum can refer to spectrum that does not require exclusive spectrum authorization from the government.
  • 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.
  • 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.
  • 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.
  • the first channel access method may refer to a non-LBT channel access method, or channel transmission that exempts the LBT process.
  • 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.
  • the first channel access method may refer to a type 2C channel access method (type 2C LBT method).
  • type 2C LBT method type 2C LBT 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.
  • 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).
  • 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.
  • the first sidelink channel may be a sidelink channel currently being transmitted or currently being prepared for transmission.
  • the sidelink channel may include S-SSB.
  • 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 .
  • the sidelink channel may include PSFCH.
  • the first information can be defined in many ways.
  • 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.
  • 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
  • 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.
  • 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.
  • 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).
  • 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 ⁇ .
  • the first communication device usually only sends S-SSB in one set of transmission resources and receives S-SSB in other S-SSB resources.
  • 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.
  • 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.
  • 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.
  • the first sidelink feedback method may refer to a sidelink feedback method that only feeds back NACK (ie, a NACK-only sidelink feedback method).
  • 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.
  • the PSFCH of the first communication device may be transmitted through the first channel access mode.
  • 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.
  • the PSFCH of the first communication device may be transmitted through the first channel access mode.
  • the receiving end 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.
  • the sending end 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.
  • 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.
  • case 1 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).
  • 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.
  • the second communication device may be a communication device transmitting PSSCH (PSSCH associated with PSFCH).
  • the first type of channel may include a sidelink channel whose sidelink priority meets a certain condition.
  • the first type of channel may include a PSFCH whose sidelink priority value is less than or equal to the threshold a.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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).
  • the PSFCH may be specified by the protocol to have the highest or lowest channel access priority.
  • the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH.
  • the above threshold a may also be determined based on preconfiguration information or configuration information of the network device.
  • the first type of channel may include a PSFCH with a sidelink priority value less than or equal to the threshold a.
  • 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.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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 above threshold b may also be determined based on preconfiguration information or configuration information of the network device.
  • the first type of channel may include a PSFCH whose periodicity of sidelink feedback resources meets certain conditions.
  • the first type of channel may be a PSFCH in which the period of the sidelink feedback resource is greater than 2 time slots.
  • the first type of channel may be a PSFCH with a sidelink feedback resource period of 4 time slots.
  • 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.
  • the first channel access method includes a Type 2C channel access method or a SCSt transmission method.
  • 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.
  • 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.
  • the first sidelink channel is S-SSB
  • 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.
  • M, M1 and M2 mentioned above are all positive integers.
  • 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
  • the first side channel mentioned above may refer to part or all of the channels to be transmitted.
  • step S1410 of Figure 14 can be replaced with one or more steps of step S1610 and step S1620.
  • 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.
  • the channel access result of the second channel access method includes one or more of the following: LBT success, and LBT failure.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Embodiment 2.1 The first condition is associated with the sidelink priority of the first sidelink channel
  • 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.
  • a certain threshold hereinafter referred to as threshold c
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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 threshold c may be determined based on preconfiguration information or configuration information of the network device.
  • 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.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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 threshold d may be determined based on preconfiguration information or configuration information of the network device.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • the first time range may be determined based on preconfiguration information or configuration information of the network device.
  • the first time range may be 50 milliseconds (ms).
  • the first time range may include multiple time slots.
  • n may represent the time slot corresponding to the first sidelink channel.
  • T 1 can represent the duration corresponding to the first time range.
  • ⁇ can represent a parameter determined based on the size of the sidelink subcarrier spacing. ⁇ can take values based on the mapping relationship shown in Table 2 below.
  • 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.
  • ⁇ ⁇ f 2 ⁇ ⁇ 15[kHz] 0 15 1 30 2 60 3 120
  • 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.
  • the transmission of the multiple first side channels can be regarded as one transmission or multiple transmissions.
  • 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.
  • the first communication device determines to transmit on the shared spectrum through the first channel access method. First side channel.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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.
  • 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.
  • the first channel access mode is the SCSt mode as an example, and several more specific examples are given.
  • the first sidelink channel is the sidelink synchronization signal (S-SSB) shown in FIG. 13 .
  • S-SSB sidelink synchronization signal
  • its synchronization period is 160ms.
  • 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.
  • the first communication device can use the SCSt mode to perform channel access when sending S-SSB.
  • 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).
  • this time slot will be referred to as a PSFCH time slot for short.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • the first communication device when it 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.
  • the first communication device 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
  • 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.
  • 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.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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.
  • 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 ( ⁇ s).
  • Embodiment 2.2 and Embodiment 2.3 may be independent of each other or may be combined with each other.
  • 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.
  • 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.
  • 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.
  • the first channel access mode is the SCSt mode as an example, and several more specific examples are given.
  • the first sidelink channel is the sidelink synchronization signal (S-SSB) in Figure 13.
  • S-SSB sidelink synchronization signal
  • its synchronization period is 160ms.
  • 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.
  • the threshold f is 2500 ⁇ s, 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.
  • 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.
  • S-SSB will not occupy more than 2500 ⁇ s.
  • 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 2500 ⁇ s.
  • the SCS is 60kHz
  • 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 2500 ⁇ s. Therefore, S-SSB transmission can meet the conditions of SCSt mode.
  • 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).
  • 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.
  • PSFCH occupies 2 time domain symbols in each time slot. Therefore, for a 30kHz SCS sidelink system, one PSFCH occupies 71.36us.
  • the communication equipment even in each PSFCH time slot
  • 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).
  • 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.
  • PSFCH occupies 2 time domain symbols in each time slot.
  • one PSFCH occupies 71.36us.
  • the threshold f is 2500 ⁇ s
  • the first information further 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 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.
  • 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.
  • the first sidelink channel corresponds to M time domain transmission opportunities.
  • the first communication device transmits the first side channel on the shared spectrum through the first channel access method.
  • the first communication device transmits the first sidelink channel at most once in the M time domain transmission opportunities.
  • the first channel access method includes a Type 2C channel access method or a SCSt transmission method.
  • 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.
  • the first sidelink channel is S-SSB
  • 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.
  • 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.
  • M, M1 and M2 can all be positive integers greater than 1.
  • the first information includes indication information of the channel access mode
  • 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.
  • the indication information may be included in preconfiguration information or configuration information of the network device.
  • 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.
  • 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
  • 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.
  • the first channel access method that is, a channel access method that does not require listening, such as SCSt
  • SCSt channel access method that does not require listening
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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.
  • the PSFCH may be specified by the protocol to have the highest or lowest channel access priority.
  • the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH.
  • the above threshold g may also be determined based on preconfiguration information or configuration information of the network device.
  • 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
  • the first communication device transmits the first sidelink channel on the shared spectrum through the first channel access mode.
  • the first communication device 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.
  • the first sidelink channel includes S-SSB or PSFCH.
  • the first sidelink channel corresponds to the PSFCH in a sidelink feedback mode that only feeds back NACK.
  • 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.
  • 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.
  • 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.
  • the first sidelink channel is S-SSB
  • 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.
  • M, M1 and M2 mentioned above are all positive integers.
  • M, M1 and M2 can all be positive integers greater than 1.
  • 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.
  • 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.
  • the first channel access mode can be used to transmit the PSFCH, that is, LBT is not required and the PSFCH is directly transmitted.
  • LBT is not required and the PSFCH is directly transmitted.
  • 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.
  • the first information includes the priority corresponding to the first side channel
  • the first communication device determines to transmit the first sidelink channel on the shared spectrum through the first channel access method.
  • 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.
  • the first channel access method that is, a channel access method that does not require listening, such as SCSt
  • SCSt a channel access method that does not require listening
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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 PSFCH may be specified by the protocol to have the highest or lowest channel access priority.
  • the configuration information of the network device may include indication information for configuring the channel access priority of the PSFCH.
  • 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.
  • 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
  • the channel access priority is, for example, the channel access priority corresponding to the first sidelink channel.
  • the first sidelink channel is PSFCH
  • the sidelink priority is the sidelink priority corresponding to PSFCH
  • 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 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.
  • the first communication device performs transmission for a first duration before the first OFDM symbol corresponding to the first sidelink channel.
  • the first communication device performs the transmission of the first duration after the last OFDM symbol corresponding to the first sidelink channel.
  • the difference between the duration corresponding to one OFDM symbol and the first duration is less than or equal to the threshold j.
  • the above threshold j may satisfy one or more of the following: greater than or equal to 25 ⁇ s; equal to 16 ⁇ s; less than or equal to 16 ⁇ s.
  • 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.
  • 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.
  • CPE cyclic prefix extension
  • 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.
  • 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.
  • 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.
  • the second information is resource pool configuration information or sidelink bandwidth part (BWP) configuration information.
  • BWP sidelink bandwidth part
  • the second information is obtained according to preconfiguration information or network configuration information.
  • 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.
  • 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.
  • 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.
  • the first communication device may first make a determination based on the second information, and perform the judgment based on the second information.
  • 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.
  • 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.
  • 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.
  • 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 first information includes a type of a first side channel
  • 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.
  • the first type of channel includes S-SSB and/or PSFCH.
  • 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.
  • 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.
  • the priority value corresponding to the PSFCH is less than or equal to the first threshold (corresponding to the threshold a mentioned above).
  • 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.
  • 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.
  • the second threshold meets one or more of the following: greater than or equal to 25 ⁇ s; equal to 16 ⁇ s; less than or equal to 16 ⁇ s.
  • 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.
  • 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.
  • the first information includes the channel access result of the second channel access method
  • 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.
  • the first information includes the channel access result of the second channel access method
  • 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.
  • 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.
  • the first condition is associated with the priority corresponding to the first sidelink channel
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the duration corresponding to a time range, ⁇ represents a parameter determined based on the size of the sidelink subcarrier spacing.
  • 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.
  • the first information includes the priority corresponding to the first sidelink channel
  • 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.
  • 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.
  • 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 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.
  • the processor may be a central processing unit (CPU).
  • 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.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA off-the-shelf programmable gate array
  • 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.
  • 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.
  • 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.
  • 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.
  • the "instruction" mentioned may be a direct instruction, an indirect instruction, or an association relationship.
  • 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.
  • correlate 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.
  • 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).
  • devices for example, including terminal devices and network devices.
  • predefined can refer to what is defined in the protocol.
  • 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.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • 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.
  • 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.
  • the computer program product includes one or more computer instructions.
  • 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.
  • magnetic media e.g., floppy disks, hard disks, magnetic tapes
  • optical media e.g., digital video discs (DVD)
  • semiconductor media e.g., solid state disks (SSD)

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication sans fil et un dispositif de communication. Le procédé comprend l'étape suivante : un premier dispositif de communication détermine, en fonction de premières informations, s'il faut transmettre un premier canal de liaison latérale sur un spectre partagé dans un premier mode d'accès au canal (S1410), les premières informations comprenant un ou plusieurs des éléments suivants : le type du premier canal de liaison latérale ; le résultat d'accès au canal du second mode d'accès au canal ; la priorité correspondant au premier canal de liaison latérale ; des informations d'indication du mode d'accès au canal ; et si l'opportunité de transmission actuelle est ou non la dernière opportunité de transmission du premier canal de liaison latérale. Le premier mode d'accès au canal est un mode d'accès au canal dans lequel le spectre partagé n'est pas surveillé avant que le premier canal de liaison latérale soit transmis sur le spectre partagé. Selon les modes de réalisation de la présente invention, les premières informations sont introduites pour clarifier les facteurs qui doivent être pris en compte lorsque le premier canal de liaison latérale est transmis sur le spectre partagé dans le premier mode d'accès au canal, ce qui facilite l'application d'un système de liaison latérale au spectre partagé.
PCT/CN2022/089576 2022-04-27 2022-04-27 Procédé de communication sans fil et dispositif de communication WO2023206145A1 (fr)

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CN113518385A (zh) * 2020-04-09 2021-10-19 上海诺基亚贝尔股份有限公司 与lbt过程有关的操作
WO2021237607A1 (fr) * 2020-05-28 2021-12-02 Oppo广东移动通信有限公司 Procédé de transmission de bloc de signal de synchronisation (ssb) et dispositif terminal
WO2022028545A1 (fr) * 2020-08-06 2022-02-10 维沃移动通信有限公司 Procédé d'accès à un canal pour spectre sans licence, et terminal et dispositif côté réseau
CN114073160A (zh) * 2020-06-05 2022-02-18 北京小米移动软件有限公司 信道接入方法、信道接入装置及存储介质
WO2022061754A1 (fr) * 2020-09-25 2022-03-31 Nokia Shanghai Bell Co., Ltd. Temps d'occupation de canal pour des communications de liaison latérale dans une bande sans licence
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