WO2023193237A1 - Procédé d'accès à un canal, dispositif terminal et dispositif réseau - Google Patents

Procédé d'accès à un canal, dispositif terminal et dispositif réseau Download PDF

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Publication number
WO2023193237A1
WO2023193237A1 PCT/CN2022/085817 CN2022085817W WO2023193237A1 WO 2023193237 A1 WO2023193237 A1 WO 2023193237A1 CN 2022085817 W CN2022085817 W CN 2022085817W WO 2023193237 A1 WO2023193237 A1 WO 2023193237A1
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WIPO (PCT)
Prior art keywords
channel
duration
channel access
terminal device
configuration information
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PCT/CN2022/085817
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English (en)
Chinese (zh)
Inventor
赵振山
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Oppo广东移动通信有限公司
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Priority to PCT/CN2022/085817 priority Critical patent/WO2023193237A1/fr
Priority to CN202280082306.9A priority patent/CN118402297A/zh
Publication of WO2023193237A1 publication Critical patent/WO2023193237A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present application relates to the field of communications, and more specifically, to a channel access method, terminal equipment, and network equipment.
  • Spectrum resources are divided into licensed spectrum and unlicensed spectrum.
  • the licensed spectrum can only be used by certain authorized institutions or operators, while the unlicensed spectrum is a shared spectrum that can be used by different institutions or operators.
  • terminal equipment and network equipment In order to fairly use unlicensed spectrum, terminal equipment and network equipment need to perform a listen-before-talk (LBT) channel access process before sending data. If the LBT channel access process is not completed, terminal equipment and network equipment cannot use the unlicensed spectrum for data transmission. After the LBT channel access process is completed, terminal equipment and network equipment can use the unlicensed spectrum for data transmission. For scenarios where data transmission is side-link transmission, how to perform side-link transmission on unlicensed spectrum (or shared spectrum) is a technical problem to be solved.
  • LBT listen-before-talk
  • Embodiments of the present application provide a channel access method, terminal equipment, and network equipment, which can implement sidelink transmission.
  • This embodiment of the present application provides a channel access method, including:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device performs channel monitoring of a specified length according to the configuration information;
  • the terminal device determines whether to perform sidelink transmission according to the channel monitoring result.
  • This embodiment of the present application provides a channel access method, including:
  • the network device sends configuration information to the terminal device
  • the configuration information is used to instruct the terminal device to monitor the channel for a specified length.
  • An embodiment of the present application provides a terminal device, including:
  • the first processing unit is used to perform channel monitoring of a specified length according to the configuration information when the counter is reduced to 0 when performing first channel access;
  • the second processing unit is used to determine whether to perform sidelink transmission based on the channel monitoring results.
  • This embodiment of the present application provides a network device, including:
  • the fifth processing unit is used to send configuration information to the terminal device
  • the configuration information is used to instruct the terminal device to monitor the channel for a specified length.
  • An embodiment of the present application provides a terminal device, including a processor and a memory.
  • the memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory, so that the terminal device executes the method described in the above embodiments of the present application.
  • An embodiment of the present application provides a network device, including a processor and a memory.
  • the memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory, so that the terminal device executes the method described in the above embodiments of the present application.
  • the embodiment of the present application provides a chip for implementing the method described in the above embodiment of the present application.
  • the chip includes: a processor, configured to call and run a computer program from a memory, so that the device installed with the chip executes the method described in the above embodiments of the present application.
  • Embodiments of the present application provide a computer-readable storage medium for storing a computer program.
  • the computer program When the computer program is run by a device, the device performs the method described in the above embodiments of the present application.
  • Embodiments of the present application provide a computer program product, which includes computer program instructions.
  • the computer program instructions cause a computer to execute the method described in the above embodiments of the present application.
  • An embodiment of the present application provides a computer program, which when run on a computer causes the computer to execute the above method described in the embodiment of the present application.
  • the terminal device when the terminal device performs the first channel access and the counter is reduced to 0, the terminal device can monitor the channel of a specified length according to the configuration information. Using this application, after accessing the channel, the terminal device can monitor the channel according to the configuration information. The result determines whether sidelink transmission is performed.
  • Figure 1 is a schematic diagram of an application scenario according to an embodiment of the present application.
  • Figure 2 is a schematic diagram of an intranet communication scenario according to an embodiment of the present application.
  • Figure 3 is a schematic diagram of a partial network coverage sidelink communication scenario according to an embodiment of the present application.
  • Figure 4 is a schematic diagram of a communication scenario outside network coverage according to an embodiment of the present application.
  • Figure 5 is a schematic diagram of a side communication scenario with a central control node according to an embodiment of the present application.
  • Figure 6 is a schematic diagram of a unicast scenario according to an embodiment of the present application.
  • Figure 7 is a schematic diagram of a multicast scenario according to an embodiment of the present application.
  • Figure 8 is a schematic diagram of a broadcast scene according to an embodiment of the present application.
  • Figure 9(a) is a schematic diagram of a time slot structure in which the PSFCH channel is not included in the time slot according to an embodiment of the present application.
  • Figure 9(b) is a schematic diagram of the time slot structure including the PSFCH channel in the time slot according to an embodiment of the present application.
  • Figure 10 is a schematic diagram of a unicast scenario of sidelink transmission according to an embodiment of the present application.
  • Figure 11 is a schematic diagram of channel occupancy time sharing on the base station side according to an embodiment of the present application.
  • Figure 12 is a schematic diagram of another application scenario according to an embodiment of the present application.
  • Figure 13 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 14 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 15 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 16 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 17 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 18 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 19 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 20 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 21 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 22 is a schematic flow chart of a channel access method according to an embodiment of the present application.
  • Figure 23 is a schematic flow chart of an example of a channel access method according to an embodiment of the present application.
  • Figure 24 is a schematic flow chart of an example of a channel access method according to an embodiment of the present application.
  • Figure 25 is a schematic flow chart of an example of a channel access method according to an embodiment of the present application.
  • Figure 26 is a schematic flow chart of an example of a channel access method according to an embodiment of the present application.
  • Figure 27 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Figure 28 is a schematic block diagram of a network device according to an embodiment of the present application.
  • Figure 29 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • Figure 30 is a schematic block diagram of a chip according to an embodiment of the present application.
  • Figure 31 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA broadband code division multiple access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced long term evolution
  • NR New Radio
  • NTN Non-Terrestrial Networks
  • UMTS Universal Mobile Telecommunication System
  • WLAN Wireless Local Area Networks
  • WiFi wireless fidelity
  • 5G fifth-generation communication
  • the communication system in the embodiment of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a standalone (Standalone, SA) deployment scenario.
  • CA Carrier Aggregation
  • DC Dual Connectivity
  • SA standalone deployment scenario.
  • the communication system in the embodiment of the present application can be applied to the unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or the communication system in the embodiment of the present application can also be applied to the licensed spectrum, where, Licensed spectrum can also be considered as unshared spectrum.
  • the embodiments of this application describe various embodiments in combination with network equipment and terminal equipment.
  • the terminal equipment may also be called user equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.
  • User Equipment User Equipment
  • the terminal device can be a station (ST) in the WLAN, a cellular phone, a cordless phone, a session initiation system (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, or a personal digital processing unit.
  • ST station
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites). superior).
  • the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, or an augmented reality (Augmented Reality, AR) terminal.
  • Equipment wireless terminal equipment in industrial control, wireless terminal equipment in self-driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home, etc.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized devices that can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones.
  • the network device may be a device used to communicate with mobile devices.
  • the network device may be an access point (Access Point, AP) in WLAN, or a base station (Base Transceiver Station, BTS) in GSM or CDMA.
  • BTS Base Transceiver Station
  • it can be a base station (NodeB, NB) in WCDMA, or an evolutionary base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network network equipment (gNB) or network equipment in the future evolved PLMN network or network equipment in the NTN network, etc.
  • AP Access Point
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • Evolutional Node B, eNB or eNodeB evolution base station
  • gNB NR network network equipment
  • the network device may have mobile characteristics, for example, the network device may be a mobile device.
  • the network device can be a satellite or balloon station.
  • the satellite can be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geosynchronous orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite ) satellite, etc.
  • the network device may also be a base station installed on land, water, etc.
  • network equipment can provide services for a cell, and terminal equipment communicates with the network equipment through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.
  • the cell can be a network equipment ( For example, the cell corresponding to the base station), the cell can belong to the macro base station, or it can belong to the base station corresponding to the small cell (Small cell).
  • the small cell here can include: urban cell (Metro cell), micro cell (Micro cell), pico cell ( Pico cell), femto cell (Femto cell), etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-rate data transmission services.
  • FIG. 1 illustrates a communication system 100.
  • the communication system 100 includes a network device 110 and two terminal devices 120.
  • the communication system 100 may include multiple network devices 110, and the coverage of each network device 110 may include other numbers of terminal devices 120, which is not limited in this embodiment of the present application.
  • the communication system 100 may also include other network entities such as a Mobility Management Entity (MME), an Access and Mobility Management Function (AMF), etc.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • network equipment may include access network equipment and core network equipment. That is, the wireless communication system also includes multiple core networks used to communicate with access network equipment.
  • the access network equipment can be a long-term evolution (long-term evolution, LTE) system, a next-generation (mobile communication system) (next radio, NR) system or authorized auxiliary access long-term evolution (LAA- Evolutionary base station (evolutional node B, abbreviated as eNB or e-NodeB) macro base station, micro base station (also known as "small base station"), pico base station, access point (access point, AP), Transmission point (TP) or new generation base station (new generation Node B, gNodeB), etc.
  • LTE long-term evolution
  • NR next-generation
  • LAA- Evolutionary base station evolutional node B, abbreviated as eNB or e-NodeB
  • eNB next-generation
  • NR next-generation
  • LAA- Evolutionary base station evolutional node B, abbre
  • the communication equipment may include network equipment and terminal equipment with communication functions.
  • the network equipment and terminal equipment may be specific equipment in the embodiments of the present application, which will not be described again here; the communication equipment also It may include other devices in the communication system, such as network controllers, mobility management entities and other network entities, which are not limited in the embodiments of this application.
  • the "instruction” mentioned in the embodiments of this application 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, it can also mean that there is an associated relationship between the two, or it can mean indicating and being instructed, configuration and being. Configuration and other relationships.
  • side-link communication according to the network coverage of the communicating terminal equipment, it is divided into network-covered inner-line communication, partial network-covered side-line communication, and network-covered outer-line communication, as shown in Figure 2, Figure 3, and Figure respectively. 4 and 5, side-link communication in different network coverage environments is achieved.
  • Figure 2 is a schematic diagram of a side-link communication scenario within the network coverage according to an embodiment of the present application.
  • all terminal devices performing side-link communication are within the coverage of the same base station.
  • the above-mentioned terminal devices can all perform side-link communication based on the same side-link configuration by receiving configuration signaling from the base station.
  • Figure 3 is a schematic diagram of a side-link communication scenario with partial network coverage according to an embodiment of the present application.
  • some terminal devices performing side-link communication are located within the coverage of the base station.
  • this part of the terminal equipment can receive the configuration signaling of the base station, and perform sideline communication according to the configuration of the base station.
  • the terminal equipment located outside the network coverage cannot receive the configuration signaling of the base station.
  • the terminal equipment outside the network coverage will use the pre-configuration information and the terminal equipment located within the network coverage.
  • the information carried in the sent Physical Sidelink Broadcast Channel (PSBCH) determines the sidelink configuration and performs sidelink communication.
  • PSBCH Physical Sidelink Broadcast Channel
  • Figure 4 is a schematic diagram of a side-line communication scenario outside network coverage according to an embodiment of the present application. As shown in Figure 4, for side-line communication outside network coverage, all terminal devices performing side-line communication are located outside the network coverage. The side-link configuration is determined based on the pre-configuration information for side-link communication.
  • FIG. 5 is a schematic diagram of a side communication scenario with a central control node according to an embodiment of the present application.
  • a central control node for side communication with a central control node, multiple terminal devices form a communication group.
  • a central control node which can also be called a cluster head terminal device (Cluster Header, CH).
  • the central control node has one of the following functions: responsible for the establishment of a communication group; joining and leaving group members; coordinating resources and providing services for other terminals
  • the device allocates sideline transmission resources, receives sideline feedback information from other terminal devices, and coordinates resources with other communication groups.
  • D2D Device to Device communication
  • V2X Vehicle to everything
  • SL sidelink
  • D2D/V2X is usually used in the Internet of Vehicles system.
  • D2D/V2X is used to enable direct communication from terminal device to terminal device.
  • 3GPP defines the following two transmission modes: first mode and second mode.
  • the transmission resources of the terminal equipment are allocated by the network equipment (such as the base station), and the terminal equipment transmits data on the sidelink according to the resources allocated by the base station; the base station can allocate a single transmission to the terminal equipment. resources, and semi-static transmission resources can also be allocated to terminal devices. As shown in Figure 2, the terminal device is located within the network coverage, and the network allocates transmission resources for sidelink transmission to the terminal device.
  • the terminal device selects a resource in the resource pool for data transmission.
  • the terminal device is located outside the cell coverage, and the terminal device independently selects transmission resources from the preconfigured resource pool for side transmission; or as shown in Figure 2, the terminal device independently selects from the network configured resource pool. Transmission resources for sideline transmission.
  • V2X has also proposed more advanced application scenarios for V2X.
  • the application in the Internet of Vehicles also needs to support autonomous driving, so it has proposed more advanced data interaction between vehicles.
  • High requirements such as higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc.
  • Figure 6 is a schematic diagram of a unicast scenario according to an embodiment of the present application. As shown in Figure 6, for unicast transmission, there is only one terminal device at the receiving end, and unicast transmission is performed between UE1 and UE2.
  • Figure 7 is a schematic diagram of a multicast scenario according to an embodiment of the present application.
  • the receiving end is all terminal devices in a communication group, or all terminal devices within a certain transmission distance.
  • UE1, UE2, UE3 and UE4 form a communication group, where UE1 is the sending device and is used to send data, and other terminal devices in the group are receiving devices.
  • FIG 8 is a schematic diagram of a broadcast scene according to an embodiment of the present application.
  • the receiving end is any terminal device around the sending end terminal device.
  • UE1 is the sending end device, and other surrounding devices
  • Terminal devices such as UE2-UE6 are all receiving end devices.
  • Figure 9(a)- Figure 9(b) The system frame structure of NR-V2X is shown in Figure 9(a)- Figure 9(b).
  • Figure 9(a) is a schematic diagram of the time slot structure of the time slot that does not include the Physical Sidelink Feedback Channel (PSFCH) channel according to an embodiment of the present application
  • Figure 9(b) is a schematic diagram of the time slot according to an embodiment of the present application.
  • the time slot of the embodiment includes a schematic diagram of the time slot structure of the PSFCH channel.
  • the Physical Sidelink Control Channel starts from the second sidelink symbol of the time slot in the time domain and occupies 2 or 3 Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division) Multiplexing (OFDM) symbols can occupy ⁇ 10, 1215, 20, 25 ⁇ physical resource blocks (Physical Resource Block, PRB) in the frequency domain.
  • OFDM Orthogonal Frequency Division Multiplexing
  • PRB Physical Resource Block
  • PSSCH also starts from the second sidelink symbol of the time slot in the time domain.
  • the last time domain symbol in the time slot is the guard period (Guard period, GP) symbol, and the remaining symbols are mapped to the PSSCH.
  • the first siderow symbol in this time slot is a repetition of the second siderow symbol.
  • the receiving end device uses the first siderow symbol as an automatic gain control (Automatic Gain Control, AGC) symbol.
  • AGC Automatic Gain Control
  • the data is generally not used for data demodulation.
  • PSSCH occupies M1 sub-channels in the frequency domain, and each sub-channel includes M2 consecutive PRBs, as shown in Figure 9(a).
  • the second to last and third to last symbols in the time slot are used for PSFCH channel transmission, and a time domain symbol before the PSFCH channel is used as the GP symbol, as shown in Figure 9(b) .
  • FIG 10 is a schematic diagram of a unicast scenario of sidelink transmission according to an embodiment of the present application.
  • the sending end terminal sends sideline data (including PSCCH and PSSCH) to the receiving end terminal.
  • the terminal sends HARQ feedback information (including ACK or NACK) to the sending terminal, and the sending terminal determines whether retransmission is needed based on the feedback information from the receiving terminal.
  • the HARQ feedback information is carried in a sidelink feedback channel (such as PSFCH).
  • the sideline feedback can be activated or deactivated through preconfiguration information or network configuration information, or the sideline feedback can be activated or deactivated through the sending terminal. If the sidelink feedback is activated, the receiving terminal receives the sideline data sent by the sending terminal and feeds back ACK or NACK to the sending end according to the detection result. The sending terminal decides to send retransmitted data or new data based on the feedback information from the receiving end. ; If the side row feedback is deactivated, the receiving terminal does not need to send feedback information, and the sending terminal usually uses blind retransmission to send data. For example, the sending terminal repeatedly sends K (K is a positive integer) for each side row data. ) times, instead of deciding whether to send retransmitted data based on feedback information from the receiving terminal.
  • K is a positive integer
  • this spectrum can be considered a shared spectrum, that is: communication equipment (terminal equipment or network equipment) in different communication systems if they meet the requirements of the country or According to the requirements set by the region on the spectrum, the spectrum can be used without applying for an exclusive spectrum authorization from the government.
  • WIFI Wireless Fidelity
  • LTE systems and NR systems have evolved through Long Term Evolution in Unlicensed Spectrum (LTE-U) and unlicensed spectrum respectively.
  • New Radio in Unlicensed Spectrum (NR-U) technology can also work in this unlicensed spectrum.
  • signal transmission on the unlicensed spectrum includes the following:
  • Maximum channel occupancy time refers to the maximum length of time allowed to use unlicensed spectrum channels for signal transmission after LBT is successful. There are different MCOTs under different channel access priorities. The current maximum value of MCOT is 10ms. It should be understood that the MCOT is the time occupied by signal transmission.
  • Channel Occupancy Time refers to the length of time that the unlicensed spectrum channel is used for signal transmission after LBT is successful.
  • the channel occupied by the signal within this length of time may be discontinuous. Among them, the longest one COT cannot exceed 20ms, and the length of time occupied by signal transmission within the COT does not exceed MCOT.
  • Channel occupancy time (gNB-initiated COT) of network equipment (such as base stations): also called COT initiated by network equipment, it refers 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 by UE under certain conditions.
  • UE's channel occupancy time also called UE-initiated COT, refers to the channel occupancy time obtained after the UE LBT is successful.
  • Downlink transmission opportunity A group of downlink transmissions (that is, including one or more downlink transmissions) performed by network equipment.
  • the group of downlink transmissions is continuous transmission (that is, there is no gap between multiple downlink transmissions), or the group of downlink transmissions is continuous. There is a gap in the group's downstream transmission but the gap is less than or equal to 16 ⁇ s. If the gap between two downlink transmissions performed by the network device is greater than 16 ⁇ s, then the two downlink transmissions are considered to belong to two downlink transmission opportunities.
  • Uplink transmission opportunity a group of uplink transmissions (that is, including one or more uplink transmissions) performed by a terminal device.
  • the group of uplink transmissions are continuous transmissions (that is, there are no gaps between multiple uplink transmissions), or There is a gap in the uplink transmission of this group but the gap is less than or equal to 16 ⁇ s. If the gap between two uplink transmissions performed by the terminal equipment is greater than 16 ⁇ s, then the two uplink transmissions are considered to belong to two uplink transmission opportunities.
  • the LBT methods in the NR-U system mainly include: Type 1 (Type1) channel access method and Type 2 (Type2) channel access method.
  • Type1 channel access method is: multi-slot channel detection with random backoff based on contention window size adjustment.
  • the corresponding channel access priority (Channel Access Priority Class, CAPC) can be selected according to the priority of the service to be transmitted, and the channel access priority can be recorded as p.
  • Type1 channel access method is mainly used for communication equipment (terminal equipment or network equipment) to initiate channel occupation;
  • Type2 channel access method is: channel access method based on fixed-length listening time slots.
  • Type2 channel access methods include Type2A channel access, Type2B channel access and Type2C channel access.
  • Type2 channel access mode is mainly used for communication equipment (terminal equipment or network equipment) to occupy shared channels.
  • Type1 channel access and Type2 channel access in NR-U.
  • the network device is a base station, and the channel access parameters corresponding to different channel access priorities p on the base station side are as shown in Table 1 below.
  • Table 1 m p refers to the number of backoff time slots corresponding to channel access priority p
  • CW p refers to the contention window (Contention Window, CW) size corresponding to 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 channel access priority The maximum channel occupation time corresponding to level p.
  • the base station can select the corresponding channel access priority p according to the priority of the service to be transmitted, and according to the channel access parameters corresponding to the channel access priority p in Table 1, obtain the unlicensed spectrum carrier in the Type1 channel access mode channel occupancy time. Within the acquired channel occupancy time, the base station can transmit continuously or discontinuously.
  • the base station uses Type1 channel access mode to perform LBT to initiate channel occupation, which may include the following steps:
  • N init N init , where N init is a uniformly distributed random number between 0 and CW p , and perform step 4).
  • T sl represents the LBT listening time slot, the length is 9 ⁇ s on the channel. If the listening time slot is idle, perform step 4); otherwise, perform step 5).
  • T d 16+ mp *9 ⁇ s
  • step 4 If the channel monitoring result is that all monitoring time slots within T d are idle, perform step 4); otherwise, perform step 5).
  • the base station can use the channel to transmit the service to be transmitted.
  • the maximum length of time that the base station can use the channel for transmission cannot exceed T mcot,p .
  • the communication device terminal device or network device
  • the communication device successfully performs the LBT of Type1 channel access mentioned above, if it does not immediately access the channel for data transmission, after that, if the communication device needs to transmit, it does not need to To perform the above-mentioned LBT of Type 1 channel access again, only a shorter LBT is required, such as channel monitoring of duration (T sl + T d ). If the channel is idle during the channel monitoring period, the channel can be accessed for transmission; otherwise, the communication device needs to perform Type1 channel access again to initiate channel occupation.
  • the terminal device performs the above Type1 channel access, it also needs to perform the above steps 1) to 6).
  • the channel access parameters corresponding to different channel access priorities p on the terminal device side As shown in Table 2 below.
  • the base station LBT When the base station LBT successfully initiates channel occupation, in addition to using the resources within the channel occupation time for downlink transmission, it can also share the resources within the channel occupation time with the terminal device for uplink transmission.
  • the channel access methods that the terminal device can use are Type2A channel access, Type2B channel access, or Type2C channel access.
  • Type2A channel access, Type2B channel access and Type2C channel access are all channel access methods based on fixed-length listening time slots.
  • the channel detection method of the terminal equipment is a single time slot channel detection of 25 microseconds ( ⁇ s). Specifically, under Type2A channel access, the terminal device can monitor the channel for 25 ⁇ s before the transmission starts, and transmit after the channel monitoring is successful.
  • the channel detection method of the terminal equipment is 16 ⁇ s single time slot channel detection. Specifically, under Type2B channel access, the terminal device can monitor the channel for 16 ⁇ s before the transmission starts, and transmit after the channel monitoring is successful. Among them, the gap size between the starting position of this transmission and the end position of the previous transmission is 16 ⁇ s.
  • the terminal equipment transmits without performing channel detection after the gap ends. Specifically, under Type2C channel access, the terminal device can directly transmit.
  • the gap size between the starting position of the transmission and the end position of the previous transmission is less than or equal to 16 ⁇ s and the length of the transmission does not exceed 584 ⁇ s.
  • FIG 11 is a schematic diagram of channel occupancy time sharing on the base station side according to an embodiment of the present application.
  • an uplink transmission opportunity occurs during the channel occupancy time on the base station side. If the starting position of the uplink transmission opportunity and the downlink transmission opportunity If the gap between the end position is less than or equal to 16 ⁇ s, the terminal device can perform Type2C channel access before the uplink transmission; if the gap between the start position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is equal to 16 ⁇ s, Then the terminal device can perform Type2B channel access before the uplink transmission; if the gap between the starting position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is equal to 25 ⁇ s or greater than 25 ⁇ s, the terminal device can perform Type2B channel access before the uplink transmission.
  • the channel occupancy time obtained by the base station may include multiple uplink and downlink conversion points (the uplink and downlink conversion points refer to the moment when downlink transmission is switched to uplink transmission, or uplink transmission is switched to downlink transmission during the channel occupancy time of the base station). At the moment of transmission, no matter what the situation, there can be multiple uplink and downlink conversion points).
  • the base station shares the channel occupancy time it obtains with the terminal device for uplink transmission, the base station can also use the Type2 channel access method (such as Type2A channel access method) to monitor the channel during the channel occupancy time, and monitor the channel during the channel occupancy time. After success, the downlink transmission is restarted.
  • Type2 channel access method such as Type2A channel access method
  • channel access can also be called LBT, and channel access and LBT are not distinguished in the embodiments of this application.
  • Type1 channel access is also called Type1 LBT
  • Type2 channel access is also called Type2 LBT
  • Type2A channel access is also called Type2A LBT
  • Type2B channel access is also called Type2B LBT
  • Type2C channel access is also called Type2C. LBT.
  • the uplink transmission opportunity may refer to: a group of uplink transmissions (that is, including one or more uplink transmissions) performed by the terminal equipment, and the group of uplink transmissions are continuous transmissions (that is, there are no gaps between the multiple uplink transmissions), Or there is a gap in the group of uplink transmissions and the gap is less than or equal to 16 ⁇ s. If the gap between two uplink transmissions performed by the terminal device is greater than 16 ⁇ s, the two uplink transmissions are considered to belong to two uplink transmission opportunities.
  • the downlink transmission opportunity refers to: a group of downlink transmissions by the base station (that is, including one or more downlink transmissions), the group of downlink transmissions are continuous transmissions (that is, there are no gaps between multiple downlink transmissions), or the group of downlink transmissions. There is a gap in the group's downstream transmission and the gap is less than or equal to 16 ⁇ s. If the gap between two downlink transmissions performed by the base station is greater than 16 ⁇ s, the two downlink transmissions are considered to belong to two downlink transmission opportunities.
  • the NR-U system when the NR-U system operates on unlicensed spectrum (or shared spectrum), it needs to determine whether the channel can be used for data transmission based on the channel access result. It can be accessed through the first channel such as the Type1 channel. mode, or a second channel such as Type2 channel access mode for data transmission.
  • the first channel such as the Type1 channel. mode
  • a second channel such as Type2 channel access mode for data transmission.
  • the terminal device For sidelink transmission scenarios, when the sidelink system operates on unlicensed spectrum (or shared spectrum), the terminal device also needs to determine whether the channel can be used for sidelink transmission based on the channel access result. If there is another terminal device performing sidelink transmission in the time slot before the time slot, the terminal device may only detect that the channel is idle in the GP symbol of the previous time slot; the length of the OFDM symbol is related to the sub-carrier spacing (Sub-Carrier Spacing). , SCS), when the subcarrier intervals are 15kHz, 30kHz, and 60kHz respectively, the corresponding OFDM symbol lengths are approximately 71 ⁇ s, 36 ⁇ s, and 18 ⁇ s respectively.
  • SCS sub-carrier Spacing
  • the GP symbols of the sidelink system are not only used for channel monitoring (such as performing the above-mentioned short "LBT” process), they are also used for terminal equipment to perform transceiver conversion or transceiver conversion.
  • the corresponding duration of transceiver conversion or transceiver conversion is approximately A few ⁇ s or a dozen ⁇ s, for example, in the first frequency range (Frequency range 1, FR1) covering the 410MHz and 7125MHz frequency bands, the duration of the transceiver conversion is 13 ⁇ s.
  • Figure 12 is a schematic diagram of another application scenario according to an embodiment of the present application, exemplarily showing the information interaction process of the channel access method 1200 of the embodiment of the present application.
  • the base station 1211 communicates with the mobile phone 1231, the mobile phone 1241 and the mobile phone 1251.
  • the information interaction process includes some or all of the following steps:
  • the base station 1211 sends configuration information to the mobile phone 1251.
  • the configuration information is used to instruct the mobile phone 1251 to monitor the channel of a specified length.
  • the mobile phone 1251 performs the first channel access and the counter decreases to 0, the mobile phone 1251 performs channel monitoring of a specified length according to the configuration information.
  • the first channel access may be Type1 channel access.
  • the mobile phone 1251 can also obtain the type of second channel access based on the configuration information, and perform channel monitoring based on the second duration corresponding to the type of second channel access.
  • the second channel access may be Type2 channel access. In some examples, if the second duration is equal to 0, the terminal device does not perform channel monitoring and directly performs sidelink transmission.
  • S1230 and the mobile phone 1251 determine whether to perform sidelink transmission based on the channel monitoring results.
  • steps S1210-S1230 There is no necessary sequence relationship between steps S1210-S1230. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed in sequence.
  • Figure 13 is a schematic flow chart of a channel access method 1300 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device performs channel monitoring of a specified length according to the configuration information.
  • channel monitoring of a specified length may be performed according to the configuration information before sidelink transmission.
  • the terminal device directly performs sidelink transmission without the need for channel monitoring.
  • the terminal device may also be called User Equipment (UE), including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection capabilities.
  • Equipment including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection capabilities.
  • Equipment tablets, laptops, handheld computers, mobile Internet devices (MID); wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted equipment in vehicle networks, devices with V2V communication capabilities Vehicles etc.
  • UE User Equipment
  • UE User Equipment
  • devices that provide voice and/or data connectivity to users such as smartphones and other handheld devices with wireless connection capabilities.
  • MID mobile Internet devices
  • wearable devices such as smart watches, smart bracelets, smart glasses
  • vehicle-mounted equipment in vehicle networks devices with V2V communication capabilities Vehicles etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs side transmission; otherwise, the channel monitoring result is that the channel is busy and side transmission cannot be performed, and the terminal device re-accesses the first channel (such as Type 1 channel access). ), that is, Type1 channel access needs to be performed again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the first duration.
  • steps S1310-S1320 There is no necessary sequence relationship between steps S1310-S1320. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device when the terminal device performs the first channel access (such as Type1 channel access) and the counter decreases to 0, the terminal device can monitor the channel of a specified length according to the configuration information. Therefore, the terminal device can monitor the channel according to the configuration information. The channel monitoring results determine whether to perform sidelink transmission.
  • the first channel access such as Type1 channel access
  • the counter decreases to 0
  • the terminal device when the terminal device performs the first channel access (such as Type1 channel access) and the counter decreases to 0, the terminal device can monitor the channel of a specified length according to the configuration information. Therefore, the terminal device can monitor the channel according to the configuration information.
  • the channel monitoring results determine whether to perform sidelink transmission.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • Figure 14 is a schematic flow chart of a channel access method 1400 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the first duration according to the configuration information.
  • the first duration of channel monitoring may be performed according to the configuration information before sidelink transmission.
  • the first duration is obtained based on the configuration information, or the first duration is determined based on protocol predefined information.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the first duration that satisfies at least one of the following conditions can be obtained based on the configuration information:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring slot
  • the starting position of T f includes the idle T sl
  • the end position of T f includes the idle T sl
  • the value of T f can be 16 ⁇ s
  • the value of T sl can be 9 ⁇ s.
  • any one parameter among A, B, C and D is obtained based on the configuration information, or any one parameter among A, B, C and D is determined according to the predefined information of the protocol, that is: A, The value of any parameter among B, C and D.
  • A, B, C and D are all integers greater than or equal to 0.
  • the value of A can be 0 or 1, and the default value is 1;
  • the value of B can be 0 or 1, and the default value is 1;
  • the value of C can be 0 or 1, the default value is 1;
  • the default value of D can be a value related to the channel access priority.
  • the terminal device monitors the channel according to the first duration.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs side transmission; otherwise, the channel monitoring result is that the channel is busy and side transmission cannot be performed, and the terminal device re-accesses the first channel (such as Type 1 channel access). ), that is, Type1 channel access needs to be performed again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the first duration.
  • steps S1410-S1430 There is no necessary sequential relationship between steps S1410-S1430. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the specified length can be the first duration, and the terminal device can perform the first duration according to the configuration information.
  • Channel monitoring so that the terminal device can determine whether to perform sidelink transmission based on the channel monitoring results.
  • parameter m when parameter X is configured in the configuration information, parameter m can be determined based on m p and/or parameter X, and m p can be determined based on the channel access priority; parameter X can be determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol. Parameter X is an integer greater than or equal to 0.
  • parameter X when parameter X is not configured in the configuration information, the value of parameter The value is determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol.
  • Parameter X is an integer greater than or equal to 0.
  • At least one parameter of the above-mentioned T, the above-mentioned A, the above-mentioned B, the above-mentioned C, the above-mentioned D and the above-mentioned X is determined based on the first parameter.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and channel busy ratio (Channel Busy Ratio, CBR).
  • the sidelink transmission priority is determined based on the priority information in the sidelink control information (Sidelink Control Information, SCI); the channel access priority is based on the quality of service (QoS) of the sidelink data or the sidelink
  • SCI Sidelink Control Information
  • QoS quality of service
  • the channel type is determined; the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located, or is determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the method further includes: obtaining a first correspondence relationship according to the above configuration information, the first correspondence relationship being used to represent at least the above T, the above A, the above B, the above C, the above D and the above X.
  • the correspondence between a parameter and the above-mentioned first parameter is determined based on the first parameter, further including: at least one parameter of T, A, B, C, D and The relationship is determined with the first parameter.
  • the terminal device performs channel monitoring based on the above-mentioned first duration, including: channel monitoring based on at least one of the above-mentioned T sl , the above-mentioned T f , and the above-mentioned T d used to describe the first duration T Monitor the results to determine whether the channel is idle.
  • judging whether the channel is idle is determined based on the channel monitoring results of at least one of the above-mentioned T sl , the above-mentioned T f , and the above-mentioned T d used to describe the first time period T, including at least one of the following methods:
  • Method 1 The terminal equipment monitors that the detection power of at least E ⁇ s is lower than the energy detection threshold X Thresh within the T sl duration, and determines that the channel is idle within the T sl duration; wherein, the energy detection threshold X Thresh is obtained based on the configuration information , E is an integer greater than or equal to 0; optionally, the value of E can be 4;
  • Method 2 The start position or the end position within the T f duration includes T sl .
  • the terminal device monitors that T sl is idle and determines that the channel is idle within the T f duration; in other words, the start position or the end position within the T f duration Including idle T sl , it is judged that the channel is idle within the duration T f ;
  • Method 3 When the terminal device detects that the T f duration and T sl duration included in the T d duration are both idle within the T d duration, it determines that the channel is idle within the T d duration; it should be understood that if the T d duration is idle, It only includes the T f duration. When the T f duration included in the T d duration is idle, the terminal device determines that the channel is idle within the T d duration. If the T d duration only includes the T sl duration, the terminal device determines that the channel is idle during the T d duration. When the T sl duration is idle, it is determined that the channel is idle within the T d duration.
  • Method 4 The terminal device monitors the T d duration and the T sl duration included in the T duration when both are idle, or the terminal device monitors the T f duration and T sl included in the T duration within the T duration. When all durations are idle, the channel is judged to be idle.
  • the terminal device determines that the channel is idle within the T duration when the T d duration included in the T duration is idle; if the T duration only includes the T f duration, the terminal device determines that the channel is idle within the T duration; If the T f duration included in the T duration is idle, the channel is judged to be idle within the T duration; if the T duration only includes the T sl duration, the terminal device determines that the channel is idle when the T sl duration included in the T duration is idle. Idle for T period of time.
  • Figure 15 is a schematic flow chart of a channel access method 1500 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the first duration according to the configuration information.
  • the first duration of channel monitoring may be performed according to the configuration information before sidelink transmission.
  • the first duration is obtained based on the configuration information, or the first duration is determined based on protocol predefined information.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the first duration that satisfies at least one of the following conditions can be obtained based on the configuration information:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring slot
  • the starting position of T f includes the idle T sl
  • the end position of T f includes the idle T sl
  • the value of T f can be 16 ⁇ s
  • the value of T sl can be 9 ⁇ s.
  • any one parameter among A, B, C and D is obtained based on the configuration information, or any one parameter among A, B, C and D is determined according to the predefined information of the protocol, that is: A, The value of any parameter among B, C and D.
  • A, B, C and D are all integers greater than or equal to 0.
  • the value of A can be 0 or 1, and the default value is 1;
  • the value of B can be 0 or 1, and the default value is 1;
  • the value of C can be 0 or 1, the default value is 1;
  • the default value of D can be a value related to the channel access priority.
  • the terminal device When the time interval between the time when the counter of the first channel access decreases to 0 and the start time of the sidelink transmission is greater than or equal to the first time period, the terminal device performs channel monitoring according to the first time period.
  • the terminal device will The channel monitoring is performed for the first duration; otherwise, the channel monitoring for the first duration is not performed, or monitoring is not performed, or sidelink transmission is performed directly.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs side transmission; otherwise, the channel monitoring result is that the channel is busy and side transmission cannot be performed, and the terminal device re-accesses the first channel (such as Type 1 channel access). ), that is, Type1 channel access needs to be performed again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the first duration.
  • steps S1510-S1530 There is no necessary sequence relationship between steps S1510-S1530. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed in sequence.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the specified length can be the first duration, and the terminal device can perform the first duration according to the configuration information.
  • Channel monitoring where the time interval between the time when the counter of the first channel access decreases to 0 and the start time of the sidelink transmission is greater than or equal to the first duration, the terminal device can monitor the channel according to the first time period. Channel monitoring is performed for a period of time, so that the terminal device can determine whether to perform sidelink transmission based on the channel monitoring results.
  • Figure 16 is a schematic flow chart of a channel access method 1600 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the first duration according to the configuration information.
  • the first duration of channel monitoring may be performed according to the configuration information before sidelink transmission.
  • the first duration is obtained based on the configuration information, or the first duration is determined based on protocol predefined information.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the first duration that satisfies at least one of the following conditions can be obtained based on the configuration information:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring slot
  • the starting position of T f includes the idle T sl
  • the end position of T f includes the idle T sl
  • the value of T f can be 16 ⁇ s
  • the value of T sl can be 9 ⁇ s.
  • any one parameter among A, B, C and D is obtained based on the configuration information, or any one parameter among A, B, C and D is determined according to the predefined information of the protocol, that is: A, The value of any parameter among B, C and D.
  • A, B, C and D are all integers greater than or equal to 0.
  • the value of A can be 0 or 1, and the default value is 1;
  • the value of B can be 0 or 1, and the default value is 1;
  • the value of C can be 0 or 1, the default value is 1;
  • the default value of D can be a value related to the channel access priority.
  • the terminal device performs channel monitoring according to the first time period.
  • the terminal device performs channel monitoring according to the first duration. ; Otherwise, the first duration of channel monitoring is not performed, or monitoring is not performed, or sidelink transmission is performed directly.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs side transmission; otherwise, the channel monitoring result is that the channel is busy and side transmission cannot be performed, and the terminal device re-accesses the first channel (such as Type 1 channel access). ), that is, Type1 channel access needs to be performed again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the first duration.
  • steps S1610-S1630 There is no necessary sequence relationship between steps S1610-S1630. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the specified length can be the first duration, and the terminal device can perform the first duration according to the configuration information.
  • Channel monitoring wherein the time interval between the time when the first channel access is completed and the starting time of the sidelink transmission is greater than or equal to the first duration, the terminal device performs channel monitoring according to the first duration, Therefore, the terminal device can determine whether to perform sidelink transmission based on the channel monitoring results.
  • parameter m when parameter X is configured in the configuration information, parameter m can be determined based on m p and/or parameter X, and m p can be determined based on the channel access priority; parameter X can be determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol. Parameter X is an integer greater than or equal to 0.
  • parameter X when parameter X is not configured in the configuration information, the value of parameter The value is determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol.
  • Parameter X is an integer greater than or equal to 0.
  • At least one parameter of the above-mentioned T, the above-mentioned A, the above-mentioned B, the above-mentioned C, the above-mentioned D and the above-mentioned X is determined according to the first parameter .
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI, and the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type; the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the first correspondence relationship is used to represent the above T, the above A , the corresponding relationship between at least one parameter among the above-mentioned B, the above-mentioned C, the above-mentioned D and the above-mentioned X and the above-mentioned first parameter.
  • at least one parameter of T, A, B, C, D and X is determined based on the first parameter, further including: at least one parameter of T, A, B, C, D and The relationship is determined with the first parameter.
  • the terminal device performs channel monitoring according to the above-mentioned first duration, including: according to the above-mentioned T sl used to describe the first duration T , the channel monitoring results of at least one duration among the above T f and the above T d are used to determine whether the channel is idle.
  • judging whether the channel is idle is determined based on the channel monitoring results of at least one of the above-mentioned T sl , the above-mentioned T f , and the above-mentioned T d used to describe the first time period T, including at least one of the following methods:
  • Method 1 The terminal equipment monitors that the detection power of at least E ⁇ s is lower than the energy detection threshold X Thresh within the T sl duration, and determines that the channel is idle within the T sl duration; wherein, the energy detection threshold X Thresh is obtained based on the configuration information , E is an integer greater than or equal to 0; optionally, the value of E can be 4;
  • Method 2 The start position or the end position within the T f duration includes T sl .
  • the terminal device monitors that T sl is idle and determines that the channel is idle within the T f duration; in other words, the start position or the end position within the T f duration Including idle T sl , it is judged that the channel is idle within the duration T f ;
  • Method 3 When the terminal device detects that the T f duration and m T sl durations included in the T d duration are all idle within the T d duration, the terminal device determines that the channel is idle within the T d duration; it should be understood that if T d The duration only includes the T f duration. When the T f duration included in the T d duration is idle, the terminal device determines that the channel is idle within the T d duration; if the T d duration only includes the T sl duration, the terminal device determines that the channel is idle within the T d duration . When the T sl duration included in the duration is idle, the channel is judged to be idle within the T d duration.
  • Method 4 The terminal device monitors the T d duration and the T sl duration included in the T duration when both are idle, or the terminal device monitors the T f duration and T sl included in the T duration within the T duration. When all durations are idle, the channel is judged to be idle.
  • the terminal device determines that the channel is idle within the T duration when the T d duration included in the T duration is idle; if the T duration only includes the T f duration, the terminal device determines that the channel is idle within the T duration; If the T f duration included in the T duration is idle, the channel is judged to be idle within the T duration; if the T duration only includes the T sl duration, the terminal device determines that the channel is idle when the T sl duration included in the T duration is idle. Idle for T period of time.
  • the configuration information includes protocol predefined information, preconfiguration information or network configuration information.
  • the configuration information includes resource pool configuration information or sidelink bandwidth part (BandwidthPart, BWP) configuration information.
  • Figure 17 is a schematic flow chart of a channel access method 1700 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the second duration according to the configuration information.
  • channel monitoring of a specified length may be performed according to the configuration information before sidelink transmission.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • S1720 The terminal device monitors the channel according to the second duration.
  • the terminal device can obtain the type of second channel access according to the configuration information, so that it can perform channel monitoring according to the second duration corresponding to the type of second channel access.
  • the second channel access may be Type 2 channel access.
  • the Type2 channel access type includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs channel access successfully according to the second channel access type and performs side-link transmission; otherwise, the channel monitoring result is that the channel is busy and side-link transmission cannot be performed, and the terminal device Re-access the first channel (such as Type1 channel), that is, it is necessary to perform Type1 channel access again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the above-mentioned second duration.
  • steps S1710-S1730 There is no necessary sequence relationship between steps S1710-S1730. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the terminal device when the terminal device performs the first channel access (such as Type1 channel access) and the counter is reduced to 0, the terminal device can also perform channel monitoring for a second period of time according to the configuration information. Therefore, the terminal device Whether to perform sidelink transmission can be determined based on the channel monitoring results.
  • the first channel access such as Type1 channel access
  • the counter is reduced to 0
  • the terminal device can also perform channel monitoring for a second period of time according to the configuration information. Therefore, the terminal device Whether to perform sidelink transmission can be determined based on the channel monitoring results.
  • the terminal device obtains the type of second channel access according to the above configuration information, including: obtaining the type of second channel access according to the indication information included in the configuration information; wherein, the indication information Used to indicate the type of second channel access.
  • obtaining the type of the second channel access according to the configuration information includes: obtaining the type of the second channel access according to the second correspondence relationship included in the configuration information.
  • the second correspondence relationship is used to characterize the correspondence relationship between the first parameter and the type of second channel access.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • Figure 18 is a schematic flow chart of a channel access method 1800 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the second duration according to the configuration information.
  • channel monitoring of a specified length may be performed according to the configuration information before sidelink transmission.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the terminal device When the time interval between the time when the counter of the first channel access decreases to 0 and the start time of the sidelink transmission is greater than or equal to the second duration, the terminal device performs channel monitoring according to the second duration, using The second channel access type performs channel access.
  • the terminal device will Channel monitoring is performed, and the second channel access type is used for channel access; otherwise, channel monitoring for the second duration is not performed, or monitoring is not performed, or sidelink transmission is performed directly.
  • the terminal device can obtain the type of second channel access according to the configuration information, so that it can perform channel monitoring according to the second duration corresponding to the type of second channel access.
  • the second channel access may be Type 2 channel access.
  • the type of Type2 channel access includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs channel access successfully according to the second channel access type and performs side-link transmission; otherwise, the channel monitoring result is that the channel is busy and side-link transmission cannot be performed, and the terminal device Re-perform the first channel access (such as Type1 channel access), that is, you need to perform Type1 channel access again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the above-mentioned second duration.
  • steps S1810-S1830 There is no necessary sequence relationship between steps S1810-S1830. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the terminal device when the terminal device performs the first channel access (such as Type 1 channel access) and the counter decreases to 0, the terminal device can also perform channel monitoring for a second duration according to the configuration information, wherein in the first If the time interval between the time when the counter of a channel access decreases to 0 and the start time of sidelink transmission is greater than or equal to the second duration, the terminal device performs channel monitoring based on the second duration and uses the second channel (such as Type2 channel) access type performs channel access, so that the terminal device can determine whether to perform sidelink transmission based on the channel monitoring results.
  • the first channel access such as Type 1 channel access
  • the terminal device can also perform channel monitoring for a second duration according to the configuration information, wherein in the first If the time interval between the time when the counter of a channel access decreases to 0 and the start time of sidelink transmission is greater than or equal to the second duration, the terminal device performs channel monitoring based on the second duration and uses the second channel (such as Type2 channel) access type performs channel access, so that the
  • Figure 19 is a schematic flow chart of a channel access method 1900 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the terminal device When the terminal device performs first channel access and the counter decreases to 0, the terminal device obtains the second duration according to the configuration information.
  • channel monitoring of a specified length may be performed according to the configuration information before sidelink transmission.
  • terminal devices may also be called UEs, including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • UEs including but not limited to devices that provide voice and/or data connectivity to users, such as smartphones and other handheld devices with wireless connection functions; tablets, laptops , handheld computers, MID; wearable devices (such as smart watches, smart bracelets, smart glasses); vehicle-mounted devices in vehicle networks, vehicles with V2V communication capabilities, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the terminal device performs channel monitoring according to the second duration and adopts the second channel access. input type for channel access.
  • the terminal device performs channel monitoring according to the second duration,
  • the second channel access type is used for channel access; otherwise, channel monitoring for the second duration is not performed, or monitoring is not performed, or sidelink transmission is directly performed.
  • the terminal device can obtain the type of second channel access according to the configuration information, so that it can perform channel monitoring according to the second duration corresponding to the type of second channel access.
  • the second channel access may be Type 2 channel access.
  • the type of Type2 channel access includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the terminal device determines whether to perform sidelink transmission based on the channel monitoring result.
  • the terminal device if the channel monitoring result is that the channel is idle, the terminal device performs channel access successfully according to the second channel access type and performs sidelink transmission; otherwise, the channel monitoring result is that the channel is busy, and the terminal device performs the first channel access again. (such as Type1 channel access), that is, Type1 channel access needs to be performed again to initiate channel occupation.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the above-mentioned second duration.
  • steps S1910-S1930 There is no necessary sequential relationship between steps S1910-S1930. Some of the steps can be selected and executed as needed, and the above steps do not need to be executed sequentially.
  • the terminal device does not need to monitor the channel and can directly perform sidelink transmission.
  • the terminal device when the terminal device performs the first channel access (such as Type1 channel access) and the counter decreases to 0, the terminal device can also perform channel monitoring for a second duration according to the configuration information, wherein after the execution If the time interval between the time of first channel access and the start time of sidelink transmission is greater than or equal to the second duration, the terminal device performs channel monitoring based on the second duration and uses the second channel (such as Type 2 channel)
  • the access type performs channel access, so that the terminal device can determine whether to perform sidelink transmission based on the channel monitoring results.
  • the terminal device obtains the type of second channel access according to the above configuration information, including: according to the indication information included in the configuration information , to obtain the type of second channel access; wherein the indication information is used to indicate the type of second channel access.
  • obtaining the type of second channel access according to the configuration information includes: according to the second correspondence included in the configuration information, Get the type of second channel access.
  • the second correspondence relationship is used to characterize the correspondence relationship between the first parameter and the type of second channel access.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the configuration information includes protocol predefined information, preconfiguration information or network configuration information.
  • the configuration information includes resource pool configuration information or sideline BWP configuration information.
  • Figure 20 is a schematic flow chart of a channel access method 2000 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the network device sends configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to perform channel monitoring of a specified length when performing first channel access and the counter decreases to 0.
  • the network device can be a base station and other network-side devices, such as an access point (AP), relay station, transmission and reception point (Transmission and Reception Point) of a wireless local area network (Wireless Local Area Network, WLAN). TRP), Road Side Unit (RSU) in the Internet of Vehicles, etc.
  • AP access point
  • relay station relay station
  • transmission and reception point Transmission and Reception Point
  • WLAN Wireless Local Area Network
  • TRP Transmission and Reception Point
  • RSU Road Side Unit
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the terminal device when the terminal device receives the configuration information, performs first channel access (such as Type 1 channel access) and the counter decreases to 0, the specified length may be the first duration, so that the terminal device can perform the first channel access according to the configuration.
  • the information is monitored on the channel for the first period of time. If the channel monitoring result is that the channel is idle, sidelink transmission is performed.
  • the network device can send configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to monitor the channel of a specified length.
  • the terminal device After the terminal device performs the first channel access (such as Type1 channel access) and the counter is decremented, When it reaches 0, the terminal device can monitor the channel for a specified length according to the configuration information. Therefore, the terminal device can determine whether to perform sidelink transmission based on the channel monitoring result.
  • the configuration information is used to instruct the terminal device to perform first channel monitoring according to the first duration.
  • the configuration information includes: any one of parameters A, B, C, and D used to determine the first duration, where A, B, C, and D are all integers greater than or equal to 0.
  • any one parameter among A, B, C and D can also be determined based on the predefined information of the protocol, that is, the value of any one parameter among A, B, C and D is specified in the protocol.
  • the value of A can be 0 or 1, and the default value is 1; optional, the value of B can be 0 or 1, and the default value is 1; optional, the value of C can be 0 or 1, the default value is 1; optionally, the default value of D can be a value related to the channel access priority.
  • the first duration meets at least one of the following conditions:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring time slot
  • the starting position of T f includes the idle T sl
  • the end position of T f includes the idle T sl
  • the value of T f can be 16 ⁇ s
  • the value of T sl can be 9 ⁇ s.
  • the configuration information includes: when the parameter X is used to determine the delay duration, X is an integer greater than or equal to 0.
  • T d T f +m ⁇ T sl ;
  • parameter m when parameter X is configured in the configuration information, parameter m can be determined based on m p and/or parameter X, and m p can be determined based on the channel access priority; parameter X can be determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol. Parameter X is an integer greater than or equal to 0.
  • parameter X when parameter X is not configured in the configuration information, the value of parameter The value is determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol.
  • Parameter X is an integer greater than or equal to 0.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI;
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type;
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the configuration information includes: a first correspondence relationship; the first correspondence relationship is used to characterize the correspondence relationship between at least one parameter among T, A, B, C, D, and X and the first parameter.
  • Figure 21 is a schematic flow chart of a channel access method 2100 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the network device sends configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to perform channel monitoring for a first duration when performing first channel access and the counter decreases to 0.
  • the network device may be a base station and other network-side devices, such as APs of wireless LANs, relay stations, TRPs, RSUs in the Internet of Vehicles, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the network device can send configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to perform channel monitoring for a first period of time.
  • the terminal device After the terminal device performs the first channel access (such as Type1 channel access), the counter When the value is reduced to 0, the terminal device can monitor the channel for the first duration according to the configuration information. Therefore, the terminal device can determine whether to perform sidelink transmission based on the channel monitoring result.
  • the first channel access such as Type1 channel access
  • the configuration information is used to instruct the terminal device to perform first channel monitoring according to the first duration.
  • the configuration information includes: any one of parameters A, B, C, and D used to determine the first duration, where A, B, C, and D are all integers greater than or equal to 0.
  • any one parameter among A, B, C and D can also be determined based on the predefined information of the protocol, that is, the value of any one parameter among A, B, C and D is specified in the protocol.
  • the value of A can be 0 or 1, and the default value is 1; optional, the value of B can be 0 or 1, and the default value is 1; optional, the value of C can be 0 or 1, the default value is 1; optionally, the default value of D can be a value related to the channel access priority.
  • the first duration meets at least one of the following conditions:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring time slot
  • the starting position of T f includes the idle T sl
  • the end position of T f includes the idle T sl
  • the value of T f can be 16 ⁇ s
  • the value of T sl can be 9 ⁇ s.
  • the configuration information includes: when the parameter X is used to determine the delay duration, X is an integer greater than or equal to 0.
  • T d T f +m ⁇ T sl ;
  • parameter m when parameter X is configured in the configuration information, parameter m can be determined based on m p and/or parameter X, and m p can be determined based on the channel access priority; parameter X can be determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol. Parameter X is an integer greater than or equal to 0.
  • parameter X when parameter X is not configured in the configuration information, the value of parameter The value is determined based on the predefined information of the protocol, that is, the value of parameter X is specified in the protocol.
  • Parameter X is an integer greater than or equal to 0.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI;
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type;
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the configuration information includes: a first correspondence relationship; the first correspondence relationship is used to characterize the correspondence relationship between at least one parameter among T, A, B, C, D, and X and the first parameter.
  • Figure 22 is a schematic flow chart of a channel access method 2200 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following:
  • the network device sends configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to perform channel monitoring for a second period of time when the first channel access is performed and the counter is reduced to 0.
  • the network device may be a base station and other network-side devices, such as APs of wireless LANs, relay stations, TRPs, RSUs in the Internet of Vehicles, etc.
  • the configuration information may include one or more configuration information, which is not limited in the embodiments of this application.
  • the network device can send configuration information to the terminal device.
  • the configuration information is used to instruct the terminal device to perform channel monitoring for a second period of time.
  • the terminal device After the terminal device performs first channel access (such as Type1 channel access), the counter When the value is reduced to 0, the terminal device can monitor the channel for a second period of time according to the configuration information. Therefore, the terminal device can determine whether to perform sidelink transmission based on the channel monitoring result.
  • first channel access such as Type1 channel access
  • the configuration information is used to indicate the type of second channel access, and channel monitoring is performed according to the second duration corresponding to the type of second channel access.
  • the second channel access is Type2 channel access; optionally, the type of Type2 channel access includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the configuration information includes indication information; the indication information is used to indicate the type of the second channel access.
  • the configuration information includes a second correspondence relationship; the second correspondence relationship is used to characterize the correspondence relationship between the first parameter and the type of second channel access.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the configuration information includes protocol pre-defined information, pre-configuration information or network configuration information.
  • the configuration information includes resource pool configuration information or sideline BWP configuration information.
  • the communication device when the communication device (terminal device or network device) performs Type1 channel access, if the counter decreases to 0 or the first channel access is completed (ends the channel access process), the communication device does not perform data processing. transmission, the communication device needs to perform a short-duration LBT (referred to as "short LBT" in the embodiment of this application) channel monitoring before data transmission, that is, perform channel monitoring of duration (T sl + T d ). If the channel is idle within this time period, data transmission can be carried out; otherwise, Type1 channel access needs to be performed again to initiate channel occupation.
  • short LBT referred to as "short LBT” in the embodiment of this application
  • the sidelink system performs "short LBT" within the duration of the GP symbol, in addition to channel monitoring, it is also used for terminal equipment to perform transceiver conversion or For transmit-receive conversion, the above duration is adjusted so that within the duration of the GP symbol, the terminal device can perform "short LBT” monitoring and transceiver conversion (or transmit-receive conversion), and can also implement "short LBT” monitoring. Therefore, , it can be determined whether sidelink transmission can be performed.
  • the first duration that satisfies the following formula (1) can be obtained according to the configuration information sent by the network device:
  • A, B, and X are all integers greater than or equal to 0.
  • T d is called the delay duration (defer duration);
  • T sl is called the listening slot duration (sensing slot duration);
  • the starting position (or end position) of T f includes an idle T sl.
  • the first duration that satisfies the following formula (2) can also be obtained based on the configuration information sent by the network device:
  • any parameter in C and D is obtained based on the configuration information, or any parameter in C and D is determined based on the predefined information of the protocol, that is: C is specified in the protocol
  • the value of any parameter in and D, C and D are integers greater than or equal to 0;
  • the default value of A is 1, the default value of B is 1; the default value of C is 1, and the default value of D is related to the channel access priority; for example, for different channel access priorities For levels 1, 2, 3 and 4, the default values of D are 3, 3, 4 and 8 respectively; that is, according to the above Table 2, the default value of D is the value of m p in the table plus 1.
  • channel monitoring is performed according to the above-mentioned first duration T, and whether the channel is idle can be determined according to the channel monitoring result to determine whether to perform sidelink transmission, including at least one of the following methods:
  • T d T f +m ⁇ T sl
  • T f duration and T sl duration included in T d are both idle, the channel is judged to be idle within the T d duration; it should be understood that if T The d duration only includes the T f duration.
  • the terminal device determines that the channel is idle within the T d duration; if the T d duration only includes the T sl duration, the terminal device determines that the channel is idle within the T d duration .
  • the T sl duration included in the d duration is idle, it is determined that the channel is idle within the T d duration.
  • the terminal device For T, the terminal device monitors the T d duration and the T sl duration included in the T duration are both idle, or the terminal device monitors the T f duration and the T f duration included in the T duration. When both T sl durations are idle, the channel is judged to be idle.
  • the terminal device determines that the channel is idle within the T duration when the T d duration included in the T duration is idle; if the T duration only includes the T f duration, the terminal device determines that the channel is idle within the T duration; If the T f duration included in the T duration is idle, the channel is judged to be idle within the T duration; if the T duration only includes the T sl duration, the terminal device determines that the channel is idle when the T sl duration included in the T duration is idle. Idle for T period of time.
  • the terminal device can determine X Thresh based on the parameter maximum energy detection threshold X Thresh_max , for example, X Thresh is less than or equal to X Thresh_max ; where, the parameter X Thresh_max is determined based on preconfiguration information or network configuration information, including the following:
  • X Thresh_max is configured in the preconfiguration information or network configuration information (for example, the resource pool configuration information or sideline BWP configuration information includes the parameter maxEnergyDetectionThreshold), then set X Thresh_max to the value corresponding to this parameter;
  • X Thresh_max is determined based on X′ Thresh_max ;
  • X′ Thresh_max is determined according to the following formula (3);
  • T A 10dB
  • P H 23dBm
  • P TX is determined according to the maximum transmit power of the terminal equipment
  • T max (dBm) 10 ⁇ log 10 (3.16228 ⁇ 10 -8 (mW/MHz) ⁇ BWMHz (MHz)) ;
  • BWMHz represents the bandwidth occupied by the channel to be transmitted, in MHz.
  • the value of any one of the parameters T, A, B, X, C, D, X Thresh or X Thresh_max is determined based on the first parameter, which includes at least one of the following parameters:
  • Channel access priority Such as the channel access priority in the above Table 1 or the above Table 2;
  • CBR Channel Busy Ratio
  • the configuration information includes protocol predefined information, preconfiguration information or network configuration information.
  • preconfiguration information network configuration information or protocol predefined information is used to configure any one of the above parameters T, A, B, X, C, D, X Thresh or X Thresh_max , configure any one parameter and the A first correspondence relationship of a parameter, so that the terminal device can determine any of the above parameters according to the first parameter and the first correspondence relationship.
  • the first duration T can be determined based on the above formula 1;
  • the first duration T can be determined based on the above formula 2 by configuring parameters C and/or D through preconfiguration information, network configuration information, or protocol predefined information.
  • the terminal equipment will perform sidelink transmission in time slot n+1 and perform Type1 channel access before this time slot.
  • the terminal equipment No sidelink transmission will be performed.
  • Type1 channel access if the counter decreases to 0 or the first channel access is performed (ends the channel access process) and the terminal device does not send data, the terminal device performs Type2 channel access before data is sent. Access, if the channel access is successful, data will be sent, otherwise data cannot be sent.
  • Type2 channel access types include Type2A, Type2B, and Type2C channel access.
  • the resource pool configuration information or the sidelink BWP configuration information includes indication information, and the indication information is used to indicate the Type 2 channel access type.
  • the first parameter includes at least one of the following parameters:
  • Channel access priority Such as the channel access priority in the above Table 1 or the above Table 2;
  • CBR corresponds to the CBR of the resource pool where the sidelink transmission is located; or is determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the first parameter including the sidelink subcarrier spacing size includes the following content:
  • T d T f +m p ⁇ T sl
  • T f 16 ⁇ s
  • T sl 9 ⁇ s
  • m p is determined according to the channel access priority
  • the starting position (or ending position) of T f includes T sl .
  • the resource pool configuration information or sideline BWP configuration information includes a second correspondence relationship.
  • the second correspondence relationship includes a correspondence relationship between the first parameter and the channel access type.
  • the terminal device determines the corresponding relationship based on the first parameter and the channel access type.
  • the second correspondence determines the type of Type 2 channel access.
  • the starting position of T f includes a 9 ⁇ s T sl .
  • the end of T f includes a 9 ⁇ s T sl .
  • the terminal device is in the T If the channel is idle for at least 5 ⁇ s within the f time period, it can be determined that the channel access is successful, where the channel idle of at least 5 ⁇ s includes the channel idle of at least 4 ⁇ s in T sl .
  • Channel access and when the counter decreases to 0, the terminal device does not perform sidelink transmission, then the terminal device performs Type2C channel access before performing sidelink transmission, that is, it does not need to perform channel monitoring and directly performs sidelink transmission.
  • the terminal device can be configured to perform the first duration of short LBT, or as in the above Examples 4 to 7, the terminal device can also be configured to perform Type 2 channel access, regardless of By determining the first duration or determining the second duration corresponding to the Type2 channel access type for channel monitoring, the terminal device can complete the short LBT within one GP symbol, so that it can determine whether sidelink transmission can be performed based on the channel monitoring results. This avoids the problem that the terminal device cannot complete the short LBT within the GP symbol due to the short length of the GP symbol.
  • Figure 27 is a schematic block diagram of a terminal device 2700 according to an embodiment of the present application.
  • the terminal device 2700 may include: a first processing unit 2710, configured to perform first channel access and when the counter decreases to 0, the terminal device performs channel monitoring of a specified length according to the configuration information; a second processing unit 2720, configured to Determine whether to perform sidelink transmission based on the channel monitoring results.
  • the second processing unit is used to perform the sidelink transmission when the channel monitoring result is that the channel is idle; or, when the channel monitoring result is that the channel is busy , perform first channel access or resource reselection again.
  • the terminal device if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers the resource reselection.
  • the specified length may be the first duration.
  • the first processing unit is configured to obtain a first duration according to the configuration information; and perform channel monitoring according to the first duration.
  • the first processing unit is configured to obtain a first duration that satisfies at least one of the following conditions according to the configuration information:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring time slot
  • the starting position of T f includes the idle T sl ;
  • A, B, C and D are all integers greater than or equal to 0.
  • min() means taking the minimum value
  • max() means taking the maximum value.
  • the terminal device further includes a third processing unit, configured to determine the value of X according to all channel access priorities when the X is not configured in the configuration information. The value corresponding to the maximum value or the minimum value in m p is determined; or, the value of X is determined based on predefined information.
  • At least one parameter of the T, the A, the B, the C, the D and the X is determined according to a first parameter; the first parameter includes: side At least one of row subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • a fourth processing unit is further included, configured to obtain a first correspondence relationship according to the configuration information, where the first correspondence relationship is used to characterize the T, the A, the B, The corresponding relationship between at least one parameter among the C, the D and the X and the first parameter;
  • At least one parameter among the T, the A, the B, the C, the D and the X is determined according to the first parameter, including:
  • At least one parameter among the T, the A, the B, the C, the D and the X is determined according to the first correspondence relationship and the first parameter.
  • the value of T f is 16 ⁇ s
  • the value of T sl is 9 ⁇ s.
  • the value of C is 0 or 1, and the default value is 1; the default value of D is a value related to the channel access priority.
  • the first processing unit is configured to use a channel based on at least one of the T sl , the T f , and the T d used to describe the first duration T. Monitor the results to determine whether the channel is idle.
  • the first processing unit is configured to monitor channels according to at least one of the T sl , the T f , and the T d used to describe the first time length. The result determines whether the channel is idle, including at least one of the following methods:
  • Method 1 The terminal equipment monitors that the detection power of at least E ⁇ s is lower than the energy detection threshold X Thresh within the T sl duration, and determines that the channel is idle within the T sl duration; wherein the energy detection threshold X Thresh is based on the The configuration information is obtained, and E is an integer greater than or equal to 0;
  • Method 2 The starting position or the end position within the T f duration includes T sl , the terminal device monitors that the T sl is idle, and determines that the channel is idle within the T f duration;
  • Method 3 When the terminal device detects that the T f duration and T sl duration included in the T d duration are both idle within the T d duration, it determines that the channel is idle within the T d duration; it should be understood that if The T d duration only includes the T f duration. When the T f duration included in the T d duration is idle, the terminal device determines that the channel is idle within the T d duration; if the T d duration only includes the T sl duration , the terminal device determines that the channel is idle during the T d duration. When the T sl duration included in the T d duration is idle, it is determined that the channel is idle within the T d duration.
  • Method 4 The terminal device monitors that the T d duration and the T sl duration included in the T duration are both idle, or the terminal device monitors the T sl duration within the T duration. When the T f duration and T sl duration included in the T duration are both idle, the channel is determined to be idle.
  • the terminal device determines that the channel is idle within the T duration when the T d duration included in the T duration is idle; if the T duration only includes the T f duration, the terminal device determines that the channel is idle within the T duration; If the T f duration included in the T duration is idle, the channel is judged to be idle within the T duration; if the T duration only includes the T sl duration, the terminal device determines that the channel is idle when the T sl duration included in the T duration is idle. Idle for T period of time.
  • the first processing unit is configured to perform channel monitoring using at least one of the following:
  • the first channel access is Type 1 channel access.
  • the first processing unit is configured to obtain a type of second channel access according to the configuration information; and perform channel processing according to a second duration corresponding to the type of second channel access. monitor.
  • the first processing unit is configured to obtain the type of the second channel access according to the indication information included in the configuration information; the indication information is used to indicate the third channel access type. Type of two-channel access.
  • the first processing unit is configured to obtain the type of the second channel access according to the second correspondence included in the configuration information; wherein the second correspondence Used to represent the correspondence between the first parameter and the type of the second channel access.
  • the first parameter includes: sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, CBR of at least one.
  • the first processing unit is configured to perform channel monitoring using at least one of the following:
  • the second processing unit is used to perform the channel access successfully according to the second channel access type and perform the sidelink transmission when the channel monitoring result is that the channel is idle; If the channel monitoring result is that the channel is busy, first channel access or resource reselection is performed again. In some examples, if the channel monitoring result is that the channel is busy, or the channel monitoring of the specified length is unsuccessful, or the terminal device fails to perform the first channel access, the terminal device triggers resource reselection.
  • the specified length may be the above-mentioned second duration.
  • the second channel access is Type2 channel access.
  • the type of Type2 channel access includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the configuration information includes protocol predefined information, preconfiguration information or network configuration information.
  • the configuration information includes resource pool configuration information or sidelink bandwidth part BWP configuration information.
  • the terminal device 2700 in the embodiment of the present application can implement the corresponding functions of the terminal device in the foregoing method embodiment.
  • each module (sub-module, unit or component, etc.) in the terminal device 2700 please refer to the corresponding description in the above method embodiment, and will not be described again here.
  • the functions described for each module (sub-module, unit or component, etc.) in the terminal device 2700 in the embodiment of the application may be implemented by different modules (sub-module, unit or component, etc.), or may be implemented by the same Module (submodule, unit or component, etc.) implementation.
  • Figure 28 is a schematic block diagram of a network device 2800 according to an embodiment of the present application.
  • the network device 2800 may include: a fifth processing unit 2810, configured to send configuration information to the terminal device; the configuration information is used to instruct the terminal device to perform a specified length when performing first channel access and the counter is reduced to 0. Channel monitoring.
  • the configuration information is used to instruct the terminal device to perform first channel monitoring according to the first duration.
  • the configuration information includes: any one of parameters A, B, C, and D used to determine the first duration, and A, B, C, and D are all greater than or equal to 0. integer;
  • the first duration meets at least one of the following conditions:
  • T is the first duration
  • T d is the delay duration
  • T sl is the duration of the monitoring time slot
  • the starting position of T f includes the idle T sl .
  • the configuration information includes: when the parameter X is used to determine the delay duration, X is an integer greater than or equal to 0;
  • T d T f +m ⁇ T sl ;
  • the parameter m is determined based on m p and/or the X, and m p is determined based on the channel access priority.
  • min() means taking the minimum value
  • max() means taking the maximum value.
  • the network device further includes a sixth processing unit, configured to determine the value of X according to all channel access priorities when the configuration information does not include the X.
  • the value corresponding to the maximum value or the minimum value in m p is determined; or, the value of X is determined based on predefined information.
  • At least one parameter of the T, the A, the B, the C, the D and the X is determined according to a first parameter;
  • the configuration information includes: a first Correspondence; the first correspondence is used to characterize the correspondence between at least one parameter among the T, the A, the B, the C, the D and the X and the first parameter.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the first channel access is Type 1 channel access.
  • the configuration information is used to indicate a type of second channel access, and channel monitoring is performed according to a second duration corresponding to the type of second channel access, and the specified length corresponds to The second duration.
  • the configuration information includes: indication information; the indication information is used to indicate the type of the second channel access.
  • the configuration information includes: a second correspondence
  • the second correspondence relationship is used to characterize the correspondence relationship between the first parameter and the type of the second channel access.
  • the second channel access is Type2 channel access.
  • the type of Type2 channel access includes: at least one of Type2A channel access, Type2B channel access, and Type2C channel access.
  • the first parameter includes: at least one of sidelink subcarrier spacing size, sidelink transmission priority, channel access priority, and CBR.
  • the sidelink transmission priority is determined based on the priority information in the SCI
  • the channel access priority is determined based on the QoS of the sidelink data or the sidelink channel type
  • the CBR corresponds to the CBR of the resource pool where the sidelink transmission is located. , or determined based on the CBR of the resource pool where the sidelink transmission is located.
  • the configuration information includes protocol predefined information, preconfiguration information or network configuration information
  • the configuration information includes resource pool configuration information or sidelink bandwidth part BWP configuration information.
  • the network device 2800 in the embodiment of the present application can implement the corresponding functions of the network device in the foregoing method embodiment.
  • each module (sub-module, unit or component, etc.) in the network device 2800 please refer to the corresponding description in the above method embodiment, and will not be described again here.
  • the functions described for each module (sub-module, unit or component, etc.) in the network device 2800 in the embodiment of the application may be implemented by different modules (sub-module, unit or component, etc.), or may be implemented by the same Module (submodule, unit or component, etc.) implementation.
  • Figure 29 is a schematic structural diagram of a communication device 2900 according to an embodiment of the present application.
  • the communication device 2900 includes a processor 2910, and the processor 2910 can call and run a computer program from the memory, so that the communication device 2900 implements the method in the embodiment of the present application.
  • communication device 2900 may also include memory 2920.
  • the processor 2910 can call and run the computer program from the memory 2920, so that the communication device 2900 implements the method in the embodiment of the present application.
  • the memory 2920 may be a separate device independent of the processor 2910, or may be integrated into the processor 2910.
  • the communication device 2900 may also include a transceiver 2930, and the processor 2910 may control the transceiver 2930 to communicate with other devices.
  • the communication device 2900 may send information or data to other devices, or receive information or data sent by other devices. .
  • the transceiver 2930 may include a transmitter and a receiver.
  • the transceiver 2930 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 2900 may be a terminal device in the embodiment of the present application, and the communication device 2900 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, details will not be described here.
  • the communication device 2900 may be a network device in the embodiment of the present application, and the communication device 2900 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, details will not be described again.
  • Figure 30 is a schematic structural diagram of a chip 3000 according to an embodiment of the present application.
  • the chip 3000 includes a processor 3010, and the processor 3010 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 3000 may also include a memory 3020.
  • the processor 3010 can call and run the computer program from the memory 3020 to implement the method executed by the terminal device or the terminal device in the embodiment of the present application.
  • the memory 3020 may be a separate device independent of the processor 3010, or may be integrated into the processor 3010.
  • the chip 3000 may also include an input interface 3030.
  • the processor 3010 can control the input interface 3030 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.
  • the chip 3000 may also include an output interface 3040.
  • the processor 3010 can control the output interface 3040 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.
  • the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the network device in the various methods of the embodiment of the present application.
  • the details will not be described again.
  • the chips applied to the terminal equipment and the terminal equipment may be the same chip or different chips.
  • chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.
  • the processor mentioned above can be a general-purpose processor, a digital signal processor (DSP), an off-the-shelf programmable gate array (FPGA), an application specific integrated circuit (ASIC), or Other programmable logic devices, transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processor
  • FPGA off-the-shelf programmable gate array
  • ASIC application specific integrated circuit
  • the above-mentioned general processor may be a microprocessor or any conventional processor.
  • non-volatile memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM).
  • the memory in the embodiment of the present application can also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchrono ⁇ s DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Ramb ⁇ s RAM, DR RAM) and so on. That is, memories in embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.
  • FIG 31 is a schematic block diagram of a communication system 3100 according to an embodiment of the present application.
  • the communication system 3100 includes a terminal device 3110 and a network device 3120.
  • the terminal device 3110 may include: a first processing unit configured to perform first channel access and when the counter decreases to 0, the terminal device performs operations according to the configuration information. Channel monitoring of a specified length; a second processing unit used to determine whether to perform sidelink transmission based on the channel monitoring results.
  • the network device 3120 may include: a fifth processing unit, configured to send configuration information to the terminal device; the configuration information is used to instruct the terminal device to perform channel monitoring of a specified length.
  • 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 computer-readable storage medium, for example, the computer instructions may be transmitted over a wired connection from a website, computer, server, or data center (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed 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 (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), etc.
  • 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.

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

Abstract

La présente demande concerne un procédé d'accès à un canal, un dispositif terminal et un dispositif de réseau. Le procédé comprend les étapes suivantes : lorsqu'un dispositif terminal exécute un premier accès à un canal et qu'un compteur compte jusqu'à 0, le dispositif terminal effectue une surveillance de canal d'une longueur spécifiée selon des informations de configuration ; et le dispositif terminal détermine, en fonction du résultat de surveillance de canal, s'il faut effectuer une transmission de liaison latérale. Au moyen de la présente demande, après l'accès à un canal, il est déterminé, en fonction d'un résultat de surveillance de canal, s'il faut effectuer une transmission de liaison latérale.
PCT/CN2022/085817 2022-04-08 2022-04-08 Procédé d'accès à un canal, dispositif terminal et dispositif réseau WO2023193237A1 (fr)

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PCT/CN2022/085817 WO2023193237A1 (fr) 2022-04-08 2022-04-08 Procédé d'accès à un canal, dispositif terminal et dispositif réseau
CN202280082306.9A CN118402297A (zh) 2022-04-08 2022-04-08 信道接入方法、终端设备、网络设备

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