WO2024012129A1 - Indication information sending method, apparatus, and system - Google Patents

Abstract

An indication information sending method, apparatus, and system. The method comprises: a first terminal apparatus receives first indication information from a second terminal apparatus, the first indication information comprising first time frequency resource information and first priority information, the first time frequency resource information being used for indicating a first time frequency resource reserved by the second terminal apparatus, the first time frequency resource being used for sending first sidelink information, and the first priority information being used for indicating the priority of the first sidelink information; the first terminal apparatus performs channel access on a first channel; and when the priority of information to be sent of the first terminal apparatus is lower than the priority of the first sidelink information, the first terminal apparatus sends second indication information to the second terminal apparatus on the first channel, the second indication information being used for indicating that a second time frequency resource in a first channel occupancy time is a time frequency resource shared to the second terminal apparatus, and the time domain position of the second time frequency source being the same as the time domain position of the first time frequency resource. On the basis of the solution, the transmission of high-priority information at an expected sending time can be ensured as much as possible, thereby improving the transmission reliability of the high-priority information.

Description

Instruction information sending method, device and system

This application claims priority to the Chinese patent application filed with the China Patent Office on July 15, 2022, with application number 202210837741. in this application.

Technical field

Embodiments of the present application relate to the field of communications, and in particular to methods, devices and systems for sending side-travel indication information.

Background technique

In wireless communication systems, the frequency bands used by communication equipment can be divided into licensed frequency bands and unlicensed frequency bands. In the authorized frequency band, communication equipment uses spectrum resources based on the scheduling of the central node. In unlicensed frequency bands, communication devices compete for channels through the listen before talk (LBT) mechanism.

The LBT mechanism is a channel access rule based on random backoff. A communication device needs to sense whether the channel is idle before accessing the channel and starting to send data. If the channel remains idle for a period of time, it can occupy the channel and send data in the channel. Among them, the length of time the channel is occupied is called channel occupancy time (COT).

In the new radio (NR) (NR-U) system under unlicensed spectrum, the LBT mechanism supports COT sharing, that is, after the communication device obtains the COT through LBT, it can share the unlicensed spectrum in the COT with other communication devices. resource. In the COT sharing mechanism of NR-U, the unlicensed spectrum resources shared within the COT can be scheduled by the base station.

However, in the sidelink (SL) (SL-U) scenario under unlicensed spectrum, the base station may not participate in resource allocation and scheduling. At this time, the sidelink resources between the terminal equipment and the terminal equipment Sharing may result in reduced business service quality.

Contents of the invention

This application provides a method, device and system for sending sideline information, which can improve the reliability of sideline information transmission through sideline resource sharing.

In a first aspect, a method for sending instruction information is provided, which method can be executed by a first terminal device or by a component of the first terminal device, such as a processor, a chip, or a chip system of the first terminal device, It can also be implemented by a logic module or software that can realize all or part of the functions of the first terminal device. The method includes: the first terminal device receives first indication information from the second terminal device, the first indication information includes first time-frequency resource information and first priority information, and the first time-frequency resource information is used for Indicate the first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information; The first terminal device performs channel access on the first channel and obtains the channel occupancy time of the first channel; the priority of the information to be sent at the first terminal device is lower than the first sideline information In the case of priority, the first terminal device sends second indication information to the second terminal device on the first channel, and the second indication information is used to indicate channel occupancy of the first channel. The second time-frequency resource in time is a time-frequency resource shared with the second terminal device, and the second time-frequency resource has the same time domain position as the first time-frequency resource.

Based on this solution, the second terminal device reserves the first time-frequency resource with the first terminal device, and the first terminal device shares the first channel with the second terminal device when the sidelink information priority of the second terminal device is higher. The second time-frequency resource in the channel occupancy time is used by the second terminal device to send the first sidelink information. Through this solution, the transmission of high-priority information can be ensured as much as possible and the transmission reliability of high-priority information in sidelink transmission can be improved. .

In a possible design, the method further includes: the first terminal device determines the frequency domain location of the second time-frequency resource in the first channel according to the first time-frequency resource information.

Based on this possible design, the first terminal device determines the frequency domain position of the second time-frequency resource in the first channel according to the relative position of the first time-frequency resource in the channel. In this way, it can be ensured that the signal is provided to the second terminal device. The relative frequency domain position of the shared second time-frequency resource is the same as the relative frequency domain position of its reserved resource in the channel, which can further improve the reliability of the first sidelink information transmission.

In a possible design, the first terminal device performing channel access on the first channel includes: the first terminal device performs channel listening on at least two channels, determines that the first channel is idle, and Perform channel access on the first channel; or the first terminal device selects the first channel among at least two channels to perform channel listening, determines that the first channel is idle, and performs channel access on the first channel. access.

In a possible design, the first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or the first time-frequency resource is located on the second channel, and the second time-frequency resource is located in the first channel.

In a possible design, the first terminal device receives the first sidelink information from the second terminal device on the second time-frequency resource.

Based on this possible design, the first terminal device receives the side information of the second terminal device on its shared resources, that is, the two terminal devices are a communication pair. In this case, the communication pair is effectively improved. performance of information transmission.

In a possible design, the sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

Based on this possible design, the sending time of the second indication information is at least several symbols or several time slots earlier than the starting time of the first time-frequency resource time domain, leaving enough time for the second terminal device to prepare data.

In a possible design, the first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.

In a possible design, the first indication information further includes a destination terminal device identifier of the first time-frequency resource, and the destination terminal device identifier may be an identifier of the first terminal device.

In a possible design, the first time-frequency resource information is used to indicate the time domain resource of the first time-frequency resource, and/or the frequency domain resource of the first time-frequency resource; A time-frequency resource information is also used to indicate the first period. The second terminal device periodically transmits sideline information according to the received first period, and the transmitted sideline information includes the first sideline information.

In a possible design, the second time-frequency resource can be used by the first terminal device to send information to the third terminal device.

In a second aspect, a method for sending sideline information is provided. The method can be executed by a second terminal device or by a component of the second terminal device, such as a processor, a chip, or a chip system of the second terminal device. , can also be implemented by a logic module or software that can realize all or part of the functions of the second terminal device. The method includes: the second terminal device sends first indication information to the first terminal device, the first indication information includes first time-frequency resource information and first priority information, and the first time-frequency resource information is used to indicate The first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information. ; The second terminal device receives second indication information from the first terminal device, the second indication information is used to indicate that the second time-frequency resource in the channel occupancy time of the first channel is shared with the third Time-frequency resources of two terminal devices, the second time-frequency resource and the first time-frequency resource have the same time domain position; the second terminal device sends the first side on the second time-frequency resource. row information.

In a possible design, the second terminal device sending the first sidelink information on the second time-frequency resource includes: the second terminal device transmitting the first sidelink information on the second time-frequency resource to the second terminal device on the second time-frequency resource. The first terminal device sends the first sidelink information; or the second terminal device sends the first sidelink information to the third terminal device on the second time-frequency resource.

In a possible design, the first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or the first time-frequency resource is located on the second channel, and the second time-frequency resource is located in the first channel.

In a possible design, the reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

In a possible design, the first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.

In a third aspect, a communication method is provided. The method can be executed by the first terminal device, or can be executed by components of the first terminal device, such as the processor, chip, or chip system of the first terminal device. It can also be It is implemented by a logic module or software that can realize all or part of the functions of the first terminal device. The method includes: the first terminal device receives first indication information from the second terminal device, the first indication information includes first time-frequency resource information and first priority information, and the first time-frequency resource information is used for Indicates the first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to Indicate the priority of the first sideline information; when the priority of the second sideline information to be sent by the first terminal device is lower than the priority of the first sideline information, the first The terminal device selects the first channel among at least two channels to perform channel access.

Based on this solution, when the priority of the information to be sent is lower than the priority of the data to be sent by the second terminal device, the first terminal device selects the first channel where the resources reserved by the second terminal device are located among multiple channels for channel access. , which helps to improve the preemption success rate of the channel where the first time-frequency resource is located. If the preemption is successful, the first terminal device shares the channel with the second terminal device, which improves the success rate of sending high-priority sidelink information. For example, when the second terminal device cannot seize the channel, the first terminal device seizes the channel and shares it with the second terminal device, thereby improving the overall transmission performance of sidelink transmission.

In a possible design, during the channel access process, the first terminal device determines that the first channel is idle; the first terminal device sends a second indication to the second terminal device information, the second indication information is used to indicate that the first time-frequency resource is The time-frequency resources are shared with the second terminal device, and the first time-frequency resources are located within the channel occupancy time of the first channel.

In a possible design, the method further includes: the first terminal device receiving the first sidelink information from the second terminal device on the first time-frequency resource.

In a possible design, the first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.

In a possible design, before the first terminal device selects the first channel among at least two channels for channel access, the method further includes: the first terminal device receives a message from a third terminal device. The third indication information includes second time-frequency resource information and second priority information, and the second time-frequency resource information is used to instruct the third terminal device to send the third sideline information. A third time-frequency resource, the third time-frequency resource is located in a second channel, the second priority information is used to indicate the priority of the third sideline information, and the at least two channels also include the third For the second channel, the priority of the third sideline information is lower than the priority of the first sideline information.

In a possible design, the sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

In the fourth aspect, a communication method is provided. The method can be executed by a second terminal device, or can be executed by a component of the second terminal device, such as a processor, a chip, or a chip system of the second terminal device. It can also be executed by a second terminal device. It is implemented by a logic module or software that can realize all or part of the functions of the second terminal device. The method includes: the second terminal device sends first indication information to the first terminal device, the first indication information includes first time-frequency resource information and first priority information, and the first time-frequency resource information is used to indicate The first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to indicate The priority of the first sidelink information; the second terminal device receives second indication information from the first terminal device, and the second indication information is used to share the first time-frequency resource with all The time-frequency resource of the second terminal device; the second terminal device sends the first sidelink information on the first time-frequency resource.

In a possible design, the second terminal device sending the first sidelink information on the first time-frequency resource includes: the second terminal device sending the first sidelink information on the first time-frequency resource to the first time-frequency resource. The first terminal device sends the first sidelink information; or the second terminal device sends the first sidelink information to the third terminal device on the first time-frequency resource.

In a possible design, the reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

In a possible design, the first time-frequency resource is located within a channel occupancy time of the first channel, and the channel occupancy time of the first channel is obtained by the first terminal device.

In a possible design, the first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.

In a fifth aspect, a communication device is provided for implementing various methods. The communication device may be the first terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the first terminal device, such as a chip. The communication device includes modules, units, or means (means) corresponding to the implementation method. The modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to functions.

In some possible designs, the communication device may include a processing module and a transceiver module. This processing module can be used to implement the processing functions in any of the above aspects and any possible implementation manner thereof. The transceiver module may include a receiving module and a sending module, respectively used to implement the receiving function and the sending function in any of the above aspects and any possible implementation manner thereof.

In some possible designs, the transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.

In a sixth aspect, a communication device is provided, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device performs the method described in any aspect. The communication device may be the first terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the first terminal device, such as a chip.

A seventh aspect provides a communication device, including: a processor and a communication interface; the communication interface is used to communicate with modules outside the communication device; the processor is used to execute computer programs or instructions to enable the communication device Perform the methods described in either aspect. The communication device may be the first terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the first terminal device, such as a chip.

In an eighth aspect, a communication device is provided, including: at least one processor; the processor is configured to execute a computer program or instructions stored in a memory, so that the communication device executes the method described in any aspect. The memory may be coupled to the processor, or may be independent of the processor. The communication device may be the first terminal device in the first aspect, the second aspect, or the third aspect, or a device included in the first terminal device, such as a chip.

In a ninth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer programs or instructions, which when run on a communication device, enable the communication device to perform the method described in any aspect.

A tenth aspect provides a computer program product containing instructions that, when run on a communication device, enable the communication device to perform the method described in any aspect.

An eleventh aspect provides a communication device (for example, the communication device may be a chip or a chip system). The communication device includes a processor for implementing the functions involved in any aspect.

In some possible designs, the communication device includes a memory for storing necessary program instructions and data.

In some possible designs, when the device is a system-on-a-chip, it may be composed of a chip or may include chips and other discrete components.

It can be understood that when the communication device provided in any one of the fourth to tenth aspects is a chip, the sending action/function can be understood as outputting information, and the receiving action/function can be understood as inputting information.

Among them, the technical effects brought by any one of the design methods in the fifth to tenth aspects can be referred to the technical effects brought by different design methods in the first aspect or the second aspect, and will not be described again here.

Description of drawings

Figure 1 is a schematic structural diagram of a communication system provided by this application;

Figure 2 is a schematic diagram of a scenario provided by this application for determining whether a terminal device is in a network coverage area;

Figure 3 is a schematic diagram of a listen-before-talk mechanism provided by this application;

Figure 4 is a schematic flow chart of an information sending method provided by this application;

Figure 5 is a schematic diagram of side information sharing provided by this application;

Figure 6 is a schematic flow chart of another information sending method provided by this application;

Figure 7 is another schematic diagram of side information sharing provided by this application;

Figure 8 is another schematic diagram of side information sharing provided by this application;

Figure 9 is another schematic diagram of side information sharing provided by this application;

Figure 10 is another schematic diagram of side information sharing provided by this application;

Figure 11 is a schematic structural diagram of a resource pool provided by this application;

Figure 12 is a schematic structural diagram of a staggered PRB provided by this application;

Figure 13 is a schematic diagram of the positions of PSCCH and PSSCH provided by this application;

Figure 14 is a schematic structural diagram of a terminal device provided by this application.

Figure 15 is a schematic structural diagram of a terminal device provided by this application.

Detailed ways

The technical solutions in this application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as 5G (5th generation, 5G) or new radio (NR) systems, long term evolution (long term evolution, LTE) systems, LTE Frequency division duplex (FDD) system, LTE time division duplex (TDD) system, etc. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system. The technical solution provided by this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type Communication (machine type communication, MTC), and Internet of things (Internet of things, IoT) communication system or other communication system).

In addition, the technical solutions provided by the embodiments of this application can be applied to links between network devices and terminal devices, and can also be applied to links between devices, such as device-to-device (D2D) links. D2D links can also be called side links, where side links can also be called side links or secondary links. In the embodiments of this application, D2D links, side links or secondary links all refer to links established between devices of the same type, and have the same meaning. The so-called devices of the same type can be links from terminal devices to terminal devices, links from network devices to network devices, links from relay nodes to relay nodes, etc. The embodiments of the present application do not limit this. For the link between the terminal device and the terminal device, there is a D2D link defined by the 3rd generation partnership project (3GPP) version (release, Rel)-12/13, and there is also a 3GPP definition for the Internet of Vehicles. The vehicle-to-everything link. It should be understood that V2X specifically includes vehicle-to-vehicle (V2V), vehicle and roadside infrastructure Direct communication (vehicle-to-infrastructure, V2I), vehicle-to-pedestrian (V2P), and vehicle-to-network (V2N) or vehicle-to-any entity V2X links, including Rel-14/15. V2X also includes Rel-16 and subsequent versions of V2X links based on NR systems currently being studied by 3GPP. V2V refers to communication between vehicles; V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers); V2I refers to communication between vehicles and infrastructure, such as roadside units (road side unit, RSU) or network equipment. There is also a V2N that can be included in V2I. V2N refers to the communication between vehicles and network equipment. Among them, RSU includes two types: terminal type RSU. Since it is deployed on the roadside, this terminal type RSU is in a non-mobile state and does not need to consider mobility; base station type RSU can provide timing synchronization for vehicles communicating with it. and resource scheduling.

Schematic diagram of the architecture of a mobile communication system applied in embodiments of this application. As shown in Figure 1, Figure 1 is a schematic architectural diagram of a communication system 1000 applied in an embodiment of the present application. As shown in Figure 1, the communication system includes a wireless access network 100. Optionally, the communication system 1000 may also include a core network 200 and the Internet 300. The radio access network 100 may include at least one radio access network device (110a and 110b in Figure 1), and may also include at least one terminal (120a-120j in Figure 1). The terminal is connected to the wireless access network equipment through wireless means, and the wireless access network equipment is connected to the core network through wireless or wired means. The core network equipment and the radio access network equipment can be independent and different physical devices, or the functions of the core network equipment and the logical functions of the radio access network equipment can be integrated on the same physical device, or they can be one physical device. It integrates the functions of some core network equipment and some functions of wireless access network equipment. Terminals and terminals and wireless access network equipment and wireless access network equipment can be connected to each other in a wired or wireless manner. Figure 1 is only a schematic diagram. The communication system may also include other network equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Figure 1 .

For example, taking a communication system including two terminal devices, as shown in (a) of Figure 2 , the two terminal devices may both be in a network coverage area. Or, as shown in (b) of FIG. 2 , one of the two terminal devices is in a network coverage area and the other is in a non-network coverage area. Or, as shown in (c) of Figure 2, the two terminal devices may be in different network coverage areas. Or, as shown in (d) of Figure 2, the two terminal devices may both be in areas without network coverage.

It should be understood that the information sending end in the communication system of the present application can be a network device or a terminal device, and the information receiving end can be a network device or a terminal device. This application does not limit this.

In the embodiment of this application, UE may be called terminal equipment, terminal device, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication equipment, user Agent or user device.

The terminal device may be a device that provides voice/data to users, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. Terminal equipment may include user equipment, sometimes also referred to as terminals, access stations, UE stations, remote stations, wireless communication equipment, or user devices, among others. The terminal equipment is used to connect people, things, machines, etc., and can be widely used in various scenarios, including but not limited to the following scenarios: cellular communication, D2D, V2X, machine-to-machine communication (machine-to-machine communication), etc. /machine-type communications, M2M/MTC), Internet of things (IoT), virtual reality (VR), augmented reality (AR), industrial control (industrial control), driverless ( Terminal equipment for scenarios such as self-driving), remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, drones, robots, etc. For example, the terminal device may be a mobile phone, a tablet, a computer with wireless transceiver functions, a VR terminal, an AR terminal, a wireless terminal in industrial control, a complete vehicle, or a wireless communication module in the vehicle , vehicle T-box (Telematics BOX), roadside unit RSU, wireless terminal in driverless driving, smart speakers in IoT network, wireless terminal equipment in telemedicine, wireless terminal equipment in smart grid, wireless in transportation safety Terminal equipment, wireless terminal equipment in smart cities, or wireless terminal equipment in smart homes, etc. are not limited in the embodiments of this application.

As an example and not a limitation, in this embodiment of the present application, 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. Broadly defined 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. Used, such as various types of smart bracelets, smart jewelry, etc. for measuring physical signs. In addition, in the embodiment of this application, the terminal device may also be a terminal device in the IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing human-machine Interconnection, an intelligent network that interconnects things.

The various terminal equipment introduced above can be considered as vehicle-mounted terminal equipment if they are located on the vehicle (for example, placed or installed in the vehicle). The vehicle-mounted terminal equipment is also called an on-board unit (OBU), for example. . The terminal device of this application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit built into the vehicle as one or more components or units. The vehicle can implement the method of the present application through the built-in vehicle module, vehicle module, vehicle component, vehicle chip or vehicle unit.

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

In the embodiments of the present application, the functions of the base station may also be performed by modules (such as chips) in the base station, or may be performed by a control subsystem that includes the base station functions. The control subsystem containing base station functions here can be the control center in the above application scenarios such as smart grid, industrial control, smart transportation, smart city, etc. The functions of the terminal can also be performed by modules in the terminal (such as chips or modems), or by a device containing the terminal functions.

In order to facilitate understanding of this application, the random access process and related concepts are briefly described.

1. Interface: The communication interface (Uu interface) between the terminal device and the network device can be called the Uu interface, the communication interface (PC5interface) between the terminal device and the terminal device can be called the PC5 interface, and the transmission link in the PC5 interface Is defined as a sidelink (SL). The terminal device in this application can be understood as the above-mentioned terminal equipment, or some modules/chips in the terminal equipment.

2. Unlicensed spectrum: In wireless communication systems, according to the different frequency bands used, it can be divided into licensed frequency bands and unlicensed frequency bands. In the licensed frequency band, users use spectrum resources based on the scheduling of the central node. In the unlicensed frequency band, transmitting nodes need to use spectrum resources in a competitive manner. Specifically, they compete for channels through a listen-before-talk (LBT) method. The essence of the LBT mechanism is a channel access rule based on random back-off. The UE needs to sense whether the channel is idle before accessing the channel and starting to send data. If the channel has remained idle for a certain period of time, it can occupy the channel. If the channel is not idle, it needs to wait for the channel to become idle again before it can occupy it. channel. In the 5G NR system, the NR protocol technology in the unlicensed frequency band is collectively called NR-U. It is expected that NR-U will further improve the corresponding Uu interface communication performance. Enabling SL communication in unlicensed frequency bands in local space is an important evolution direction, and the corresponding protocol technology can be collectively referred to as SL-U. Similar to the Uu interface, UEs working through SL-U also need to coexist with nearby Wi-Fi devices based on the LBT mechanism. The reason why the LBT mechanism has become a mandatory feature of unlicensed frequency bands is because various regions in the world have regulatory requirements for the use of unlicensed frequency bands. Various forms of UEs working on different communication protocols can use unlicensed frequency bands only if they meet regulations, thereby using spectrum resources relatively fairly and efficiently.

3. Sidelink resource allocation mode: NR SL supports two resource allocation modes, namely Mode 1 and Mode 2.

Mode 1 (SL mode 1): The network equipment allocates resources used for side link transmission. Mode 1 is usually used for side link communication within the coverage of the network equipment. Taking the dynamic scheduling of transmission resources by network equipment in Mode 1 as an example, the network equipment allocates resources based on the UE's buffer status report (buffer status report, BSR). Specifically, the network device indicates time-frequency resources to UE1 through downlink control information (DCI), and UE1 is the UE serving as the sender among the communicating parties. After receiving the DCI, UE1 sends sidelink control information (SCI) and data to UE2 on the time-frequency resource indicated by the DCI. UE2 is the UE serving as the receiving end among the communicating parties. In Mode 1, the sidelink transmission resources of each UE are scheduled uniformly by the network equipment, which can avoid collisions.

Mode 2 (SL mode 2): The UE independently selects the resources used for sidelink transmission.

4.LBT: LBT is a channel access rule. The UE needs to listen to whether the channel is idle before accessing the channel and starting to send data. If the channel has remained idle for a certain period of time, the UE can occupy the channel; if the channel is not idle, the UE needs to wait for the channel to become idle again. Can occupy the channel.

Generally, energy-based detection and signal type detection can be used to determine the channel status. For example, NR-U uses energy detection. Energy-based detection requires setting an energy detection threshold. When the detected energy exceeds the detection threshold, it is determined that the channel is busy and access to the channel is not allowed. When the detected energy is lower than the detection threshold, if it continues for a period of time, access to the signal is allowed. road. According to national and regional regulatory requirements for the use of unlicensed frequency bands, taking the 5GHz frequency band as an example, one channel can refer to a 20MHz bandwidth. To access a 20MHz channel, you need to meet at least the minimum occupied channel bandwidth (OCB) requirement before you can occupy the channel. Generally, the minimum OCB must be at least 80% of the normal bandwidth. Taking the normal bandwidth as 20MHz as an example, the UE At least 16MHz of bandwidth is required to seize the 20MHz channel. It should be understood that the bandwidth of a channel can also be other values, and 20 MHz is only used as an example and not a limitation.

There are many types of LBT, the following two main types are introduced:

Type 1 LBT: Communication equipment needs to perform random backoff before it can access the channel and send data. For example, the terminal device may sense that the channel is idle for the first time in a period of continuous detection (defer sensing) time (denoted as T _d ), and after decrementing the counter N to zero during the sensing slot duration, initiate data transmission. Immediately following T _d are m _p consecutive listening slot periods (denoted as T _sl ). Specifically, the terminal device can access the channel according to the following steps:

Step 1. Set N=N _init , where N _init is a random number uniformly distributed between 0 and CW _p . Perform step 2, where CWp can be the contention window for a given priority class when the priority is p. );

Step 2. If N>0, the network device or terminal device selects a down counter, and takes N=N-1;

Step 3. If the channel during the listening time slot is idle, go to step 4;

Otherwise, go to step 5;

Step 4. If N=0, stop;

Otherwise, go to step 2.

Step 5. Listen to the channel until the channel is busy in another T _d or all listening time slots in another T _d are detected as channel idle;

Step 6. If the listening time slots in another T _d are all detected as channel idle, then perform step 4;

Otherwise, proceed to step 5.

Among them, CW _min,p ≤CW _p ≤CW _max,p , CW _min,p is the minimum value of the competition window when the priority is p, CW _max,p is the maximum value of the competition window when the priority is p .

CW _min,p and CW _max,p are selected before step 1 above, m _p , CW _min,p and CW _max,p are determined based on the channel access priority value p associated with the network device or terminal device transmission, As shown in Table 1 or Table 2:

Table 1 The relationship between channel access priority value and CW _p Table 1

Table 2 The relationship between channel access priority value and CWp Table 2

In Table 1 and Table 2, T _{mcot, p} is the maximum channel occupancy time for a given priority class (maximum channel occupancy time for a given priority class), and the channel occupancy time of network equipment or terminal equipment transmitting on the channel (channel occupancy time) , COT) does not exceed T _mcot,p . In other words, COT refers to the time that the communication device is allowed to occupy the channel after successfully accessing the channel. In other words, the communication device can seize the right to use the channel for a period of time after completing the LBT process. . The channel access process is based on transmission related to network equipment or terminal equipment It is performed based on the associated channel access priority value p. The smaller the priority value in Table 1, the higher the priority. For example, priority 1 is the highest priority.

The network device or terminal device maintains the competition window value CW _p , and adjusts the value of CW _p according to the following steps before step 1:

For each priority in the table, set the CW _p =CW _min,p corresponding to the priority.

Among the feedback HARQ-ACK values corresponding to the data sent by the network device or terminal device in the reference subframe k, if at least 80% of the data is fed back negative acknowledgment (NACK), then the corresponding HARQ-ACK value of each priority level will be Increase the CW _p value to the next higher allowed value, used in step 2; otherwise, proceed to step 1. The reference subframe k is the starting subframe of the latest data transmission by the network device or terminal device on the channel.

An example of the above-mentioned first type of LBT is shown in Figure 3. Taking N as 6 as an example, the terminal device determines through listening that the channel has been idle within the duration of the first T _d . In the first T _sl Decrement N from 6 to 5 and in the second T _sl decrement N from 5 to 4. Thereafter, the terminal device detects that the channel status is busy, waits for the channel status to be idle for T _d , and then decrements N to 3 in the third T _sl . After that, the terminal device detects that the channel is busy again, waits for the channel status to be idle again for T _d , then decrements N to 2 in the fourth T _sl , and decrements N to 1 in the fifth T _sl . Decrement N to 0 in the sixth T _sl . Afterwards, the listening channel status is idle for a duration of T _d , and the terminal device accesses the channel and transmits data within the COT.

The second type of LBT is LBT without random backoff, which is divided into two situations:

Scenario A: After the communication device detects that the channel is idle for a period of time, it can send data without performing random backoff.

Case B: Send immediately after a short switching gap. For example, the communication device sends immediately after the switching interval from receiving state to sending state in COT. The switching interval can be no longer than 16us. The specific conversion time may be preset or configured by the base station, or may be related to the hardware capabilities of the communication device.

5. Resource pool: a collection of sidelink transmission resources.

A resource pool includes several continuous sub-channels in the frequency domain, and the unit in the time domain is an SL slot. Each sub-channel contains an equal number of physical resource blocks (PRB), and the specific value is configured on the resource pool by the higher layer. An SL slot is located in a slot in the time domain and occupies multiple consecutive symbols. The starting symbol position of the SL slot (start symbol) and the number of occupied continuous symbols (SLsymbolsLength) are configured by the higher layer. . All SL slots in a resource pool have the same starting position in the time domain and the same number of continuous symbols in the time domain. The SL physical channels that can be transmitted on SL time slots include Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Broadcast Channel (PSBCH), and Physical Sidelink Control Channel (Physical Sidelink Control Channel). ,PSCCH) and sidelink physical feedback channel (Physical Sidelink Feedback Channel,PSFCH).

PSCCH is used to carry control information, which can be called the first-level sidelink control information. The first-level sidelink control information carries physical layer resource information including sidelink data channel, DMRS configuration information, DMRS port number, coded modulation signal (modulation). and code signal, MCS), and resource reservation information. The resource reservation information is used to indicate the interval between the resource time domain position used by the future user to send PSSCH/PSCCH and the current time slot where PSSCH/PSCCH is located. There are two forms of expression, and they exist in the first control information at the same time. Including periodic resource reservation, used for initial transmission of other TBs, and retransmission resource information of the current PSSCH/PSCCH. Other users can determine the usage in the resource selection window based on the resource reservation information in the correctly received first control information in the resource listening window, such as whether a candidate resource in the resource selection window has been reserved by other users. The allocation method based on resource reservation can improve the reliability of resource use in distributed systems and reduce collisions.

PSSCH is used to carry data information and second-level sidelink control information. The data information is business information from terminal equipment to terminal equipment. The second-level sidelink control information is mainly used to carry other control information besides PSSCH DMRS. Specifically, it can include channel state information (channel state information, CSI) reporting trigger information, PSSCH destination user ID, PSSCH HARQ process number, new Transmit data indicator (new data indicator), HARQ transmission version number and other information. Depending on the type of service information, the format of the second-level sidelink control information is different. When the PSSCH is transmitted, it needs to be transmitted together with its corresponding PSCCH.

In a resource pool, the number of resources occupied by PSCCH is fixed, and the number of control information bits carried by the first-level sidelink control information is fixed, so there is no need to perform blind detection of the PSCCH format. PSCCH is restricted to be transmitted in a sub-channel, its time domain occupies 2 to 3 symbols, and the frequency domain bandwidth is less than or equal to one sub-channel bandwidth. The number of PRBs in the specific PSCCH frequency domain bandwidth is configured by the resource pool, and its frequency domain starting position is the same as the sub-channel bandwidth. The minimum PRB index position of the channel is aligned. Since the minimum frequency domain granularity of frequency domain resources occupied by PSSCH transmission is one sub-channel, it is possible to send an independent PSSCH on each sub-channel, that is, there may be a PSCCH on each sub-channel, and the terminal device needs to The upper blind detects the presence or absence of PSCCH. For example, a resource pool is configured with 4 sub-channels, and the configured PSCCH bandwidth is the same as the sub-channel bandwidth. Since PSSCH/PSCCH may be sent on each sub-channel, the terminal device needs to detect whether there is a PSCCH on each sub-channel. In the figure below, UE-A occupies subchannels 0 and 1 to send PSSCH/PSCCH, UE-B occupies subchannel 2 to send PSSCH/PSCCH, subchannel 3 is idle, and no information is sent. Then in fact, only PSCCH is sent on sub-channel 0 and sub-channel 2, and there is no PSCCH information on other sub-channels. The terminal device is After the PSCCH is detected on sub-channel 0 and sub-channel 2, the PSSCH is decoded based on the first-level side-link control information carried on it to obtain the content of the second-level side-link control information, and the data carried on the PSSCH is further processed. decoding.

In order to facilitate understanding of the information sending method provided in the following embodiments of the present application, the relevant concepts involved in the following embodiments are first introduced:

Sharing a COT by a terminal device can be understood as: the terminal device shares part of the time-frequency resources in the COT with other terminal devices.

The time-frequency resources within a COT may include resources whose time domain location is within the COT and frequency domain location is within the channel corresponding to the COT. The channel corresponding to the COT is a channel that the terminal device preempts (or accesses) through LBT, and the COT is the occupancy time (or usage time) of the channel that the terminal device preempts (or accesses).

Preemption resources: For a certain terminal device, preemption resources refer to the time-frequency resources in the COT corresponding to the channel that the terminal device seizes.

Shared resources: For a certain terminal device, shared resources refer to the time-frequency resources within the COT of other terminal devices that other terminal devices share with the terminal device.

Priority information: Priority information is used to indicate priority. Priority information can be expressed in various forms, for example, it can be a priority value, sequence, or other forms of expression.

In order to solve the communication reliability problem in the sidelink resource sharing scenario on the unlicensed frequency band, this application proposes a communication method. In this method, the terminal equipment shares the sidelink transmission resources according to the resource reservation information, ensuring high priority. Data transmission reliability. As shown in Figure 4, the method may include the following steps:

Step 401: The first terminal device receives the first instruction information from the second terminal device.

Correspondingly, the second terminal device sends the first indication information to the first terminal device.

The first indication information includes first time-frequency resource information, where the first time-frequency resource information is used to indicate the first time-frequency resource reserved by the second terminal device, and the first time-frequency resource is used by the second terminal device to send the first side row information.

It can be understood that the first time-frequency resource is a time-frequency resource that the second terminal device expects to use or wants to use before actually sending the first sideline information. The second terminal device may use when actually sending the first sideline information. The first time-frequency resource may also be other time-frequency resources.

The first indication information can also be transmitted in multiple ways. The first indication information is physical layer side link control information, or media access control layer side link control information, or radio resource control layer side link control information. control information. Optionally, the first indication information may also be sent by broadcast, and the first indication information may be carried on the physical sidelink feedback channel. When the first indication information is physical layer sidelink control information, the first indication information may be first-level physical layer sidelink control information or second-level physical layer link control information.

The first side row information includes first side row data information, or the first side row information includes first side row data information and first side row control information.

The first time-frequency resource information includes time domain resource indication information and/or frequency domain resource indication information. The first time-frequency resource can be understood as the time-frequency resource reserved by the second terminal device. That is, when the second terminal device has the first sideline information to be sent, it hopes that other terminal devices can share the first time-frequency resource, and thereby sends the first indication information to other terminal devices on the first time-frequency resource. The first time-frequency resource information may also include indication information of the first period. The first period is a period in which the second terminal device sends sideline data. The second terminal device may transmit the sidelink information with the first cycle as a cycle.

The first indication information also includes first priority information, which is used to indicate the priority of the first sideline information. The priority of the first side row information here can be understood as the priority of the first side row data included in the first side row information. The first priority information is the corresponding priority value of the first side row information or the first side row data. It can be understood that priority and priority value are two concepts. If the priority is high, the priority value will be low, or priority and priority value may also have a positive correlation. For example, the business priority value of data A = 1, and the business priority value of data B = 2. The priority of data A is higher than that of data B, and the importance of data A is higher than that of data B.

Optionally, the first indication information is received in the first resource pool. The first resource pool is (pre)configured for sideline data transmission and reception. Optionally, the first resource pool includes a sending resource pool and a receiving resource pool. A terminal device can only transmit data in one sending resource pool, but can receive data in multiple receiving resource pools. One resource pool includes at least one channel, The same channel is not located in multiple different resource pools. The resource usage granularity of the resource pool can be configured or preconfigured. The resource usage granularity can refer to an entire 20M channel, or one interlace RB or multiple interlace RBs in the resource pool.

Among them, preconfiguration refers to obtaining parameters without being connected to the Internet. As a possible implementation, the preconfigured parameters can be defined by protocols or regulations. At this time, the parameter can be pre-configured to the first terminal device in the form of software when the first terminal device leaves the factory. If the agreement or regulations change later, the preconfigured parameters in the first terminal device can be updated through offline software updates. . Correspondingly, the configuration may be parameters configured by the access network, or may be determined by the core network device. When the first terminal device is in the network coverage area, the access network device may configure corresponding parameters to the first terminal device through radio resource control (RRC) signaling.

Specifically, the first indication information may be received on channel A in the first resource pool, and channel A is a channel that the second terminal device has previously preempted, or channel A is a channel that other terminal devices have preempted, and the second terminal device borrows channel A. The resource sends the first indication information to the first terminal device.

The first indication information may further include a destination terminal device identifier of the first time-frequency resource, and the destination terminal device identifier may be an identifier of the first terminal device. The first terminal device confirms that the receiving end of the first sidelink information is itself according to the destination identifier, and shares the resource with the second terminal device. Optionally, the destination terminal device identifier may also be an identifier of another terminal device other than the first terminal device.

Optionally, the first terminal device and the second terminal device have a transceiver relationship and the shared resources can only be used to send information to each other, or the first terminal device and the second terminal device are within a certain distance from each other and share The resources may not be limited to transmitting and receiving with each other, that is, the second terminal device needs to send sidelink information to other terminal devices and make resource reservations to the first terminal device within the communication range.

Optionally, the first indication information includes channel access priority information, such as the channel access priority value in Table 1 or Table 2. The channel access priority value may be p=1, p=2, p=3, p=4; there may be a corresponding relationship between the priority value of the first sideline information and the channel access priority value, for example, one-to-one Relationship, a channel access priority value of 1 corresponds to a priority value of the first sideline information of 1, and a channel access priority value of 1 corresponds to a priority value of the first sideline information of 2. It can also be a one-to-many relationship. A channel access priority value of 1 corresponds to a priority value of the first sideline information of 1 or 2, and a channel access priority value of 2 corresponds to the priority of the first sideline information. The level value is 3 or 4. A channel access priority value of 3 corresponds to a priority value of the first sideline information of 5 or 6. A channel access priority value of 4 corresponds to the priority value of the first sideline information. is 7 or 8. The lower the channel access priority value, the higher the priority of channel access. Or, it can also be the other way around. The lower the channel access priority value, the lower the channel access priority. This solution is also applicable to only single-channel access. It can be understood that when the first indication information includes channel access priority information, the first priority information may no longer be included.

Step 402: The first terminal device performs channel access on the first channel.

The first terminal device obtains the channel occupancy time (COT) of the first channel. The first terminal device obtains the sending opportunity on the first channel through LBT, and the time length corresponding to the sending opportunity that can continuously send information may be called the channel occupancy time COT.

There are many ways for the first terminal device to perform channel access on the first channel, such as the following ways A and B:

Method A: The first terminal device performs channel access on the first channel including:

The first terminal device performs channel listening on at least two channels, determines that the first channel is idle, and completes channel access on the first channel.

The above-mentioned at least two channels belong to the first resource pool, that is, the first terminal device performs channel sensing in the channels included in the first resource pool, and determines that the first channel is currently idle based on the result of the channel sensing. Therefore, on the first channel Complete the channel access process and obtain the first COT of the first channel. For example, the first resource pool includes channel A and channel B. The first terminal device performs LBT on channel A and channel B. On channel A, the counter first rolls back to 0, so the first terminal device accesses channel A. It can be understood that the first resource pool may include more than two channels.

Method B: The first terminal device performs channel access on the first channel including:

The first terminal device selects a first channel among at least two channels to perform channel listening, determines that the first channel is idle, and completes channel access on the first channel.

The above-mentioned at least two channels belong to the first resource pool. The first terminal device selects the first channel among the at least two channels in the first resource pool, monitors the first channel, determines that the first channel is idle, and completes the process on the first channel. In the channel access process, the first COT of the first channel is obtained. Wherein, selecting the first channel among the at least two channels may be a random selection. For example, the first resource pool includes channel A, channel B, and channel C. The first terminal device randomly selects channel A among the three channels to perform channel listening, determines that the first channel is idle, and obtains the first COT.

It can be understood that step 401 may occur before step 402, that is, the first terminal device first receives the resource reservation information, that is, the first indication information, and then performs channel access. Alternatively, step 401 and step 402 may occur simultaneously. Or step 401 may occur after step 402, but the receiving time of the first indication information is earlier than the earliest time when the first terminal device sends sidelink information in the channel occupancy time of the first channel.

Step 403: The first terminal device sends the second instruction information to the second terminal device.

Correspondingly, the second terminal device receives the second indication information from the first terminal device.

The second indication information can enable the second terminal device to learn that the second time-frequency resource is available. The second indication information can have multiple contents and presentation methods. For example, the second indication information is used to indicate that the second time-frequency resource is shared with The time-frequency resources of the second terminal device, or the second indication The information is used to instruct the second terminal device to share the second time-frequency resource, or the second indication information is used to instruct the second terminal device to send the first sideline information in the second time-frequency resource, or the second indication information can be directly Indicates the second time-frequency resource.

The second indication information can also be transmitted in multiple ways. For example, the second indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information. Link control information. Optionally, the second indication information is first-level sidelink control information, or the second indication information is second-level sidelink control information.

The second time-frequency resource is located within the channel occupation time of the first channel. It can be understood that the second time domain resource is located within the time domain resource of the channel occupation time of the first channel.

The first terminal device may determine the second time-frequency resource according to the first time-frequency resource information. Alternatively, the first terminal device determines the second time-frequency resource according to the first time-frequency resource.

The time domain position of the second time-frequency resource is the same as the time domain position of the first time-frequency resource. Optionally, the number of frequency domain resources of the second time-frequency resource is the same as the number of frequency domain resources of the first time-frequency resource, that is, the frequency domain length of the second time-frequency resource is the same as the frequency domain length of the first time-frequency resource. Optionally, the relative position of the frequency domain resource of the second time-frequency resource in the first channel is the same as the relative position of the frequency domain resource of the first time-frequency resource in the channel. In this way, it can be ensured that the relative frequency domain position of the second time-frequency resource shared to the second terminal device is the same as the relative frequency domain position of its reserved resource in the channel, which can further improve the reliability of the first sidelink information transmission. .

For example, the frequency domain position of the first time domain resource in the channel is the 20th-30th RB away from the lowest RB of the channel, that is, the length of the frequency domain resource occupied by the first time domain resource is 10 RBs, relative to the channel The minimum starting RB distance is 20 RBs. Then the length of the frequency domain resource of the second time-frequency resource is also 10 RBs. Optionally, the offset of the starting RB of the second time-frequency resource relative to the lowest RB of the first channel is 20 RBs, that is, the position of the frequency domain resource of the second time-frequency resource relative to the first channel is the same as the position of the first time-frequency resource. Domain resources have the same position as frequency domain resources relative to the channel where they are located.

Specifically, the frequency domain resource indication information in the first time-frequency resource information indicates the frequency domain starting position and the number of RBs of the first time-frequency resource in the channel. The time domain resource indication information in the first time-frequency resource information indicates the time domain resource where the first time-frequency resource is located.

The first terminal device determines a segment of frequency domain resources with the same starting position and the same number of RBs in the first channel as the frequency domain resource of the second time-frequency resource according to the frequency domain resource indication information, or the first terminal device randomly selects A segment of frequency domain resources with the same number of RBs is used as the frequency domain resource of the second time-frequency resource.

The time domain resources that are the same as the time domain resources occupied by the first time and frequency resources are used as the time domain resources of the second time and frequency resources, thereby determining the second time and frequency resources.

The second time-frequency resource is the same as the time-domain resource of the first time-frequency resource. On this basis, the length of the frequency domain resources is the same, and the position of the frequency domain resources relative to the channel can be the same. The second time domain resource is a resource shared by the first terminal device to the second terminal device. In this way, the second terminal device can send sidelink information on the same resource in the time domain as the resource reserved by it, ensuring that the second terminal device The timeliness in sending side information of the terminal device avoids the delay in sending side information of the second terminal device.

The second time-frequency resource is located on the first channel occupied by the first terminal device.

Optionally, the channel where the first time-frequency resource is located is the first channel. In this case, the second time-frequency resource is the same as the first time-frequency resource. That is, the time-frequency resources shared by the first terminal device to the second terminal device are time-frequency resources reserved by the second terminal device. For example, as shown in FIG. 7 , the first time-frequency resource indicated by the first indication information is located on the first channel, and the channel occupied by the first terminal device is the first channel. At this time, the first time-frequency resource is equal to the second time-frequency resource, that is, the first terminal device shares the time-frequency resource reserved by the second terminal device with it.

Optionally, the first time-frequency resource is located on the second channel, the second time-frequency resource is located on the first channel, and the second time-frequency resource and the first time-frequency resource have the same time domain position. The second channel is different from the first channel, and both the second channel and the first channel are located in the first resource pool. Optionally, the position of the frequency domain resource of the second time-frequency resource relative to the first channel is the same as the position of the frequency domain resource of the first time-frequency resource relative to the second channel.

The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource. For example, the sending time of the second indication information is several symbols/time slots earlier than the time domain start time of the first time-frequency resource, and these several symbols/time slots are reserved processing delays. It is used for the second terminal device to have a period of time for data processing before sending the first sideline information after receiving the second indication information.

Optionally, in step 403, sending the second indication information by the first terminal device to the second terminal device includes:

When the priority of the information to be sent by the first terminal device is lower than the priority of the first sideline information, the first terminal device sends the second indication information to the second terminal device. That is, when the priority of the sidelink information that the first terminal device needs to send is lower than the priority of the sidelink information of the second terminal device, the first terminal device shares the second time-frequency resource with the second terminal device and sends the sidelink information to the second terminal device. The second terminal device sends second instruction information.

It can be understood that when the priority of the information to be sent by the first terminal device is higher than the priority of the first side-link information, the first terminal device sends its own side-link information first, that is, ensuring the transmission of high-priority information.

The method may further include step 404: the first terminal device receives the first sideline signal from the second terminal device on the second time-frequency resource. information.

That is, when the first time-frequency resource reserved by the second terminal device is used to send sidelink information to the first terminal device, the first terminal device shares the second time-frequency resource with the second terminal device, and transmits the second time-frequency resource to the second terminal device. Receive first sidelink information from the first terminal device on the resource. At this time, the two terminal devices form a communication pair. In this case, the performance of information transmission between the communication pairs is effectively improved.

Optionally, the second terminal device sends sideline information to the first terminal device at intervals of the first period, where the sideline information includes the first sideline information.

Optionally, a necessary condition for the first terminal device to share designated resources with the second terminal device is that the channel access priority (CAPC) of the first terminal device is higher than or equal to the channel access priority of the second terminal device. Priority (CAPC), the higher the channel access priority value, the lower the corresponding channel access priority.

In SL-U, the UE will select the resources for data transmission. Since the time-frequency resources of the unlicensed frequency band are used, the LBT needs to be performed before using the reserved resources. Since the successful access of the LBT to the channel has a certain degree of randomness, it may There may be a problem that reserved resources are preempted by other UEs, or due to constraints on transmission and reception, UEs that have preempted reserved resources may not be able to share the resources. This solution proposes to compare the priorities of reserved resources to confirm whether they can be shared, and to select the corresponding channel according to the reservation situation to perform LBT and share resources. This can effectively increase the probability of resource sharing on the channel and achieve transmission guarantee for high-priority services. , to enhance the competitiveness of SL-U for high-speed service transmission.

This application also provides a communication method. In this method, terminal devices share side transmission resources according to resource reservation information, ensuring the transmission reliability of high-priority data. As shown in Figure 6, the method may include the following steps:

Step S601: The first terminal device receives the first instruction information from the second terminal.

The first indication information includes first time-frequency resource information, where the first time-frequency resource information is used to indicate the first time-frequency resource reserved by the second terminal device, and the first time-frequency resource is used to send the first sideline information.

The first time-frequency resource is located on the first channel, that is, the second terminal device wishes to reserve the first time-frequency resource in the first channel for sidelink information transmission. The first indication information is also used to indicate that the first time-frequency resource is located on the first channel. For example, the first time-frequency resource information in the first indication information indicates that the first time-frequency resource is located on the first channel.

The first channel is located in the first resource pool. The first resource pool includes at least two channels, and the at least two channels include the first channel. The first resource pool is (pre)configured for sideline data transmission and reception. Optionally, the first resource pool includes a sending resource pool and a receiving resource pool. A terminal device can only transmit data in one sending resource pool, but can receive data in multiple receiving resource pools. The same channel is not located in multiple different resource pools. The resource usage granularity of the resource pool can be configured or preconfigured. Optionally, the first resource pool includes at least two channels.

Optionally, the first indication information is received in the first resource pool. Optionally, the second terminal device sends the first indication information to the first terminal device on a certain channel in the first resource pool.

Optionally, the first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.

The first side row information includes first side row data information, or the first side row information includes first side row data information and first side row control information.

The first time-frequency resource information includes time domain resource indication information and/or frequency domain resource indication information. The first time-frequency resource can be understood as the time-frequency resource reserved by the second terminal device. That is, when the second terminal device has the first sidelink information to be sent, it hopes that other terminal devices can share the first time-frequency resource and sends the first indication information to other terminal devices.

Optionally, the first indication information also includes first priority information, and the first priority information is used to indicate the priority of the first sideline information. The priority of the first side row information here can be understood as the priority of the first side row data included in the first side row information. The first priority information is the corresponding priority value of the first side row information or the first side row data. It can be understood that priority and priority value are two concepts. If the priority is high, the priority value will be low, or priority and priority value may also have a positive correlation. For example, the service priority value of data A = 1, and the service priority value of data B = 2. The priority of data A is higher than that of data B, and the importance of data A is higher than that of data B.

Optionally, the first time-frequency resource information also includes indication information of the first period. The first period is a period in which the second terminal device sends sideline data. The second terminal device may transmit the sidelink information with the first cycle as a cycle.

Optionally, the first indication information also includes a destination terminal device identifier of the first time-frequency resource, and the destination terminal device identifier may be an identifier of the first terminal device. The first terminal device confirms that the receiving end of the first sidelink information is itself according to the destination identifier, and shares the resource with the second terminal device. Optionally, the destination terminal device identifier may also be an identifier of another terminal device other than the first terminal device.

Optionally, the first terminal device and the second terminal device have a transceiver relationship and the shared resources can only be used to send information to each other, or the first terminal device and the second terminal device are within a certain distance from each other and share The resources may not be limited to sending and receiving to each other, i.e. the second The terminal device needs to send sidelink information to other terminal devices and reserve resources to the first terminal device within the communication range.

Step S602: The first terminal device selects a first channel among at least two channels for channel access.

The at least two channels belong to the first resource pool. The first terminal device selects the first channel where the first time-frequency resource is located among at least two channels in the first resource pool to perform channel access. After receiving the first instruction information from the second terminal device, the first terminal device preferentially selects the channel where its reserved time-frequency resources are located for channel access.

During the channel access process, the first terminal device determines that the first channel is idle, obtains the channel occupancy time of the first channel, and the first time-frequency resource is located within the channel occupancy time of the first channel.

The channel occupancy time of the first channel includes the time domain resources of the first time-frequency resource in the time domain. That is, the time occupied by the first terminal device on the first channel completely includes the time domain range of the time-frequency resources reserved by the second terminal device. It can ensure that the first terminal device shares all the time domain resources it needs with the second terminal device, ensuring the reliability of sideline transmission of the second terminal device.

Optionally, the first terminal device selects the first channel among at least two channels for channel access including:

The priority of the second sideline information to be sent by the first terminal device is lower than the priority of the first sideline information, and the first terminal device selects the first channel among at least two channels for channel access.

The priority of the information to be sent by the first terminal device is lower than the priority of the first sidelink information, and the first terminal device selects the first channel to perform the access process. That is, when the priority of the sidelink information that the first terminal device needs to send is lower than the priority of the sidelink information of the second terminal device, the first terminal device shares the first time-frequency resource with the second terminal device.

It can be understood that when the priority of the information to be sent by the first terminal device is higher than the priority of the first side-link information, the first terminal device sends its own side-link information first, that is, ensuring the transmission of high-priority information.

Step S603: The first terminal device sends the second instruction information to the second terminal device.

Correspondingly, the second terminal device receives the second indication information from the first terminal device.

The second indication information is used to indicate that the first time-frequency resource is a time-frequency resource shared with the second terminal device, or the second indication information is used to instruct the second terminal device to send the first sideline information in the first time-frequency resource, Or the second indication information is used to instruct the second terminal device to use its reserved time-frequency resources.

The second indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information. Optionally, the second indication information is first-level sidelink control information, or the second indication information is second-level sidelink control information.

Optionally, the second indication information is COT sharing indication information, used to indicate to the second terminal device that the first terminal device shares the first time-frequency resource. The first time-frequency resource is the sideline transmission information reserved by the second terminal device.

The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource. For example, the sending time of the second indication information is several symbols/time slots earlier than the time domain start time of the first time-frequency resource, and these several symbols/time slots are reserved processing delays. It is used for the second terminal device to have a period of time for data processing before sending the first sideline information after receiving the second indication information.

As shown in Figure 5 or Figure 7, the sending time of the second indication information is n3, and the time corresponding to the first time-frequency resource is n4. For example, the starting time of the first time-frequency resource is n4, and n3 is several times earlier than n4. Time slots, or several symbols earlier than n4, these time slots or symbols are used for the second terminal device to prepare data.

After receiving the second indication information, the second terminal device determines that the first terminal device has shared the first time-frequency resource with it, and sends the first sidelink information on the first time-frequency resource.

Optionally, the recipient of the first sideline information may be the first terminal device. Alternatively, the recipient of the first sideline information may be another terminal device, such as a third terminal device. In this case, the second terminal device reserves sidelink resources to the first terminal device for sending sidelink information to the third terminal device.

Optionally, this method also includes:

Step S604: The first terminal device receives the first sidelink information from the second terminal device on the first time-frequency resource. In this case, the first terminal device and the second terminal device form a communication pair. The second terminal device requests sidelink resources from the first terminal device, which is the recipient of the sidelink information, and the first terminal device shares the requested sidelink resources with it. resource. It can effectively improve the reliability of sideline information transmission.

Optionally, before the first terminal device selects the first channel for channel access in step S602, the method further includes:

The first terminal device receives third indication information from the third terminal device in the first resource pool, and the priority of the information to be sent indicated by the third indication information is lower than the priority of the first sideline information.

The first terminal device determines to select the first channel according to the third indication information and the first indication information.

Specifically, the first terminal device determines that the priority information included in the first indication information indicates a higher priority based on the third indication information and the priority information in the first indication information, and then determines the side indicated in the first indication information. Channel access is performed on the first channel where the row resource is located.

The third indication information includes third time-frequency resource information and second priority information, the third time-frequency resource information indicates the third time-frequency resource for the third terminal device to send sidelink information, and the third time-frequency resource is located in the second channel, The second priority information indicates the priority of the information to be sent by the third terminal device. The first resource pool includes at least two channels, and the at least two channels include a first channel and a second channel.

The priority of the information to be sent by the third terminal device is lower than the priority of the first sideline information, and the first terminal device selects the first channel for channel access.

That is, the first terminal device receives the first indication information from the second terminal device and the third indication information from the third terminal device, both of which are used to reserve sidelink time-frequency resources. The resources indicated by the first indication information are located on the first channel, and the resources indicated by the third indication information are located on the second channel. The priority of the sidelink information indicated by the first priority information is higher than the priority of the sidelink information indicated by the second priority information, and the priority of the sidelink information to be sent by the second terminal device is higher, then the first terminal device selects The first channel performs channel access.

As shown in Figure 8, the third indication information indicates that the reserved resources are located on the second channel, which may also be called channel 2. The first indication information indicates that the reserved resources are located on the first channel, which may also be called channel 1. The third indication information indicates that the reserved resources are located on the first channel, which may also be called channel 1. The priority corresponding to the priority information carried in the first indication is lower than the priority corresponding to the priority information carried in the first indication, then the first terminal device selects the first channel among the first channel and the second channel for access, and priority is guaranteed Transmission of high-priority sideline data.

In this way, the first terminal device performs channel access selection according to the priority of the sidelink data to be sent. The channel where the sidelink information with high priority is located is preferentially selected for channel access. It can prioritize the transmission reliability of high-priority sidelink data and improve the transmission performance of sidelink information.

Optionally, in step S602, the first terminal device selects a first channel among at least two channels for channel access. It may be replaced by: the first terminal device selects multiple channels from at least two channels for channel access, and the multiple channels include the first channel. That is, the first terminal device selects multiple channels in the first resource pool for channel access, and the first channel is finally successfully accessed.

Optionally, in step S602, if the first terminal device needs to randomly select N channels for channel access, the first terminal device receives resource reservation indication information of L terminal devices, and there are M indications among the L indication information. If the priority indicated in the information is higher than the priority of the information to be sent by the first terminal device, the first terminal device first selects M channels with resource reservations in the first resource pool, and the remaining N-M channels are in the first resource pool. M channels are excluded and the remaining channels are randomly selected. In this way, the first terminal device can preferentially seize reserved resources corresponding to high-priority side-link data, effectively improving the transmission efficiency and performance of the system.

This application also provides a communication method 700. In this method, terminal devices share side-link transmission resources based on resource reservation information of multiple terminal devices, thereby saving signaling overhead for side-link communication. The method may include the following steps:

Step 701: At least two terminal devices send sidelink indication information to the first terminal device, used to indicate sidelink time-frequency resources respectively reserved by the at least two terminal devices.

For example, before time slot n0, UE-2, UE-3 and UE-4 respectively grab channel 1 and send sidelink indication information to UE-1 in sequence. The sidelink indication information includes control information PSCCH and data information PSSCH. , and the first-level SCI in the PSCCH contains the time-frequency resource information reserved by UE-2, UE-3 and UE-4 on channel 1. The video resource information can indicate the reserved time domain resources and the reserved frequency domain. The resource and reservation period, as well as the service priority information of the sideline information to be sent on the reserved time-frequency resource, indicate the priority of the data service;

Step 702: The first terminal device performs channel access on the first channel.

For example, if UE-1 has a service demand arriving in time slot n0, the first terminal device is triggered to perform channel preemption; after UE-1 completes LBT and CW=0 in time slot n1, it finds that channel 1, that is, Channel 1, is idle and successfully preempts the channel. To the COT of Channel1.

The first terminal device determines that the time domain resources reserved by UE-2, UE-3 and UE-4 are in are staggered in the time domain, as shown in Figure 9, that is, the frequency resources are orthogonal, and are The priority information carried in the row indication information determines that the priority of the side row information to be sent by UE-2, UE-3 and UE-4 is higher than the service priority of UE-1 itself. For example, the priority value of the sidelink information to be sent by UE-1 is priority=2. The priority values of the sidelink information to be sent by UE-2, UE-3, and UE-4 are all priority=1. The priority value The lower the value, the higher the priority. That is, UE-1 determines based on the sidelink information sent by UE-2, UE-3 and UE-4 that the priority of the information to be sent by these three UEs is higher than the priority of its own service. UE-1 determines to share its reserved resources with UE-2, UE-3, and UE-4. Or, as shown in Figure 10, similar to the time domain, it is determined that the reserved resources in the frequency domain are staggered according to the sensing results. UE-1 can also determine that the reserved time-frequency resources of other UEs are orthogonal, and then can determine according to The priority situation confirms sharing of sidelink transmission resources with other UEs.

Step 703: The first terminal device sends sharing indication information to at least two terminal devices. For example, UE-1 sends the sharing indication information to UE-2, UE-3 and UE-4.

The sharing indication information is used to instruct UE-2, UE-3 and UE-4 to use their reserved sidelink time-frequency resources. Optionally, the sharing indication information includes the ID of UE-1, that is, the source ID. Further, the sharing indication information does not include the IDs of UE-2, UE-3 and UE-4, that is, it does not include the destination ID. In this way, the sharing indication can complete the sidelink resource sharing indication to UE-2, UE-3 and UE-4 by including only the ID of the first terminal device. Moreover, the sharing indication information does not need to carry a resource indication, and each UE can send information on its respective reserved sidelink resources according to the sharing indication information.

After receiving the sharing indication information, UE-2, UE-3 and UE-4 determine that the reserved sidelink resources can be used based on the ID information of UE-1 carried therein.

The sending time of the sharing indication information is earlier than the start time of the earliest time-frequency resource among the time-frequency resources reserved by UE-2, UE-3 and UE-4. For example, as shown in Figure 9, the time-frequency resources reserved by UE4 are earlier than the time-frequency resources reserved by UE-2 and UE-3. Then the sending time of the sharing indication information is earlier than the start time of the sidelink time-frequency resources reserved by UE-4, for example, several symbols/slots earlier than the start time of the time domain of the sidelink time-frequency resources reserved by UE-4, Used for UE-4 to prepare for data transmission. Optionally, the sharing indication information is sent in time slot n2, that is, the first time slot of the COT or any time slot earlier than the first time slot that requires shared resources to be sent and later than time slot n1, UE-1 Send a message to UE-2, UE-3 and UE-4. The message includes a PSCCH carrying control information and a PSSCH carrying data information. The PSCCH carries SCI information including sharing indication information, but the indication information only contains UE-1 The source identifier source ID does not include the destination identifier destination ID, instructing UE-2, UE-3 and UE-4 to use the reserved resource block to send information at the designated resource reservation location.

In time slot n2, UE-2, UE-3 and UE-4 receive the sharing indication message and analyze and determine that the Cot indication information does not contain their own ID information. Then UE-2, UE-3 and UE-4 determine their own reservation information. Obtain sharing confirmation from Ue-1;

After time slot n2, UE-2, UE-3 and UE-4 use the reserved time-frequency resources to send information at a specific time according to the reservation information.

Under the resource reservation mechanism, multiple UEs may be reserved to the same channel in the same time slot with different frequency domain granularity. When resource sharing exists, if separate ID indications are given to all reserved resource UEs, it will cause Large resource overhead, this solution also proposes a solution that does not carry a destination ID for resource sharing, which effectively reduces the overhead of resource sharing indication information.

In addition to the above data transmission methods, this application also provides a relevant introduction to the SL resource pool (hereinafter referred to as the resource pool) in the unlicensed frequency band. This is explained below.

Optionally, the resource pool includes at least one channel. For example, as shown in Figure 11, resource pool #1 may include 4 channels.

For example, the bandwidth of each channel in the resource pool may be 20 megahertz (MHz). Of course, the bandwidth of the channel can also be other values, which is not specifically limited in this application.

Optionally, a channel cannot be in different resource pools at the same time. For example, channel #1 cannot be in both resource pool #1 and resource pool #2.

Optionally, the channel can be divided into multiple sub-channels. The size of the sub-channel may be, for example: 10, 12, 15, 20, 25, 50, 75 or 100 physical resource blocks (PRBs). Wherein, the PRBs included in the sub-channel may be continuous or interlaced.

For example, when the PRBs included in the sub-channel are interleaved PRBs, the sub-channel m, m∈{0,1,…M-1} can be defined, and the index of the PRB included in the sub-channel m can be {m, M+m,2M+m,3M+m,…}. Among them, M is a constant, and its value can be determined by the subcarrier spacing.

Illustratively, as shown in Figure 12, (a) in Figure 12 shows an example in which interleaved PRBs are included in the sub-channel. (b) in Figure 12 An example in which consecutive PRBs are included in a sub-channel is shown.

Optionally, for a certain channel, the channel may include a guard PRB, which is not used for data/signaling transmission. PRBs other than protection PRBs may constitute a common PRB set. Sub-channels can be divided based on common PRB sets. In this application, unless otherwise specified, RB refers to PRB. Therefore, the descriptions of RB and PRB can be interchanged.

For a resource pool that includes multiple channels, subchannels included in different channels can be numbered consecutively. For example, channel #1 includes sub-channels numbered from 1 to 10, channel #2 may have sub-channel numbers 11 to 20, channel #3 may have sub-channel numbers 21 to 30, and so on.

In addition, if the terminal device uses multiple sub-channels in the channel for simultaneous transmission, the multiple sub-channels may be continuous sub-channels or non-continuous sub-channels, which is not specifically limited in this application.

Optionally, when the resource pool is (pre)configured to disable interlace PRBs, the PRBs in the subchannel can be contiguous. When the resource pool is (pre)configured to allow the use of interlace PRBs, the PRBs in the subchannel can be interleaved.

Optionally, before sending data, the terminal device can perform LBT on at least one channel of the resource pool. After seizing the channel to obtain the COT, transmission can be performed at the sub-channel granularity. For example, after a terminal device seizes a channel, it can transmit on at least one sub-channel of the channel. Optionally, when the resource pool is (pre)configured to disable interlace PRB, if the terminal device uses multiple sub-channels within the channel for transmission, the PSCCH can be located on the sub-channel with the smallest index among the multiple sub-channels, or it can be located on the sub-channel. On the subchannel with the lowest frequency among multiple subchannels. Furthermore, in each transmission within the COT, the PSCCH is located within the same subchannel.

When the resource pool is (pre)configured to allow the use of interlace PRB, if the terminal device uses multiple sub-channels within the channel for transmission, the PSCCH can be located on the sub-channel with the smallest index among the multiple sub-channels, or it can be located on the multiple sub-channels on the lowest frequency sub-channel. In addition, the time domain starting position of the PSCCH is the same as the time domain starting position of the resource pool, or is aligned with the time domain starting position of the resource pool. In each transmission within the COT, the PSCCH is located within the same subchannel.

For example, taking the terminal equipment using two sub-channels for transmission, as shown in (a) in Figure 13, it means that the terminal equipment selects consecutive sub-channels (sub-channel #1 and sub-channel #2) for transmission, where the PSCCH is located Subchannel #1. As shown in (b) of Figure 13, it means that the terminal equipment selects discontinuous sub-channels (sub-channel #1 and sub-channel #11) for transmission, where the PSCCH is located in sub-channel #1.

Based on the above design of PSCCH and PSSCH, PSCCH can be configured in a sub-channel, and the terminal equipment only needs to blindly decode the PSCCH in this specific sub-channel, which can reduce the power consumption of the terminal equipment.

Optionally, the above resource pool is not used to transmit periodic sidelink synchronization signals and physical broadcast channel (physical broadcast channel, PBCH) blocks (sidelink synchronization signal and PBCH block, S-SSB), that is, periodic S-SSB. SSB is configured outside the above resource pool. If S-SSB is transmitted on resources in the resource pool, it may happen that the terminal device needs to receive PSCCH/PSSCH at the same time when sending S-SSB. At this time, because the terminal device is a half-duplex device, S-SSB may Failed to send. In addition, the time slot structure of S-SSB is different from that of PSCCH/PSSCH. If S-SSB is transmitted on resources in the resource pool, it will increase the implementation complexity of the terminal equipment, and the resources in the resource pool are dynamic. Preemption (or allocation) is not suitable for periodic S-SSB transmission. In other words, configuring periodic S-SSB outside the resource pool can ensure the transmission of S-SSB and reduce the implementation complexity of the terminal device.

Optionally, you can configure a bitmap to indicate the time domain resources (or time domain location) of the resource pool. For example, the bitmap may include N bits, each of the N bits may correspond to at least one time unit, and all time units corresponding to the N bits are continuous. When the value of a certain bit is equal to 1 (or 0), it means that the time unit corresponding to the bit can be used for SL transmission, or it means that the time domain resources of the resource pool include the time unit corresponding to the bit; the value of a certain bit is equal to When 0 (or 1), it means that the time unit corresponding to the bit is not used for SL transmission, or it means that the time domain resources of the resource pool do not include the time unit corresponding to the bit.

For example, the above time unit may be a time slot, an orthogonal frequency division multiplexing (OFDM) symbol, a subframe, a frame, etc., which is not specifically limited in this application.

For SL-U, each bit in the above bitmap can be configured as 1 (or 0), indicating that the time unit corresponding to each bit can be used for SL transmission. If there is a bit in the bitmap with a value of 0 (or 1), it means that the time unit corresponding to the bit is not used for SL transmission. Then the time domain resources in the resource pool are discontinuous, which may cause the terminal device to be unable to operate without authorization. COT is maintained on channels in the band. Therefore, setting each bit in the bitmap to 1 (or 0) enables the terminal device to maintain COT on the channel in the unlicensed frequency band and implement data transmission.

Optionally, there may be reserved time slots in the SL resource pool of the licensed frequency band. The reserved time slots are used to ensure that the remaining time slot resources are bits after using the mode2 resource awareness mechanism to exclude unavailable time slot resources. An integer multiple of the graph length, while determining the time slot. In the SL resource pool of the unlicensed frequency band, if each bit in the bitmap is configured as 1 (or 0), the reservation time unit is not included (or does not exist) in the resource pool.

Optionally, the transmission in the methods shown in Figures 4 to 10 can be performed at sub-channel granularity.

Figure 14 shows a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication device 1400 may be the terminal device in Figure 2, or the first terminal device or the second terminal device in Figures 4 and 6, used to implement the method for the terminal device in the above method embodiment. For specific functions, please refer to the description in the above method embodiment.

Communication device 1400 includes one or more processors 1401. The processor 1401 can also be called a processing unit and can implement certain control functions. The processor 1401 may be a general-purpose processor or a special-purpose processor. For example, include: baseband processor, central processing unit, application processor, modem processor, graphics processor, image signal processor, digital signal processor, video codec processor, controller, memory, and/or Neural network processor, etc. The baseband processor may be used to process communication protocols and communication data. The central processing unit may be used to control the communication device 1400, execute software programs and/or process data. Different processors may be independent devices, or may be integrated in one or more processors, for example, integrated on one or more application specific integrated circuits.

Optionally, the communication device 1400 includes one or more memories 1402 to store instructions 1404, which can be executed on the processor, so that the communication device 1400 executes the method described in the above method embodiment. Optionally, the memory 1402 may also store data. The processor and memory can be provided separately or integrated together.

Optionally, the communication device 1400 may include instructions 1403 (sometimes also referred to as codes or programs), and the instructions 1403 may be executed on the processor, causing the communication device 1400 to perform the methods described in the above embodiments. . Data may be stored in processor 1401.

Optionally, the communication device 1400 may also include a transceiver 1405 and an antenna 1406. The transceiver 1405 may be called a transceiver unit, a transceiver, a transceiver circuit, a transceiver, an input/output interface, etc., and is used to implement the transceiver function of the communication device 1400 through the antenna 1406.

Optionally, the communication device 1400 may also include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, and an antenna. Speakers, microphones, input and output modules, sensor modules, motors, cameras, or displays, etc. It can be understood that in some embodiments, the UE 1400 may include more or fewer components, or some components may be integrated, or some components may be split. These components may be implemented in hardware, software, or a combination of software and hardware.

The processor 1401 and transceiver 1405 described in this application can be implemented in integrated circuits (ICs), analog ICs, radio frequency identification (RFID), mixed signal ICs, application specific integrated circuits (application specific integrated circuits) , ASIC), printed circuit board (PCB), or electronic equipment, etc. The communication device that implements the communication described in this article can be an independent device (for example, an independent integrated circuit, a mobile phone, etc.), or it can be a part of a larger device (for example, a module that can be embedded in other devices). For details, please refer to the above-mentioned information. The description of terminal equipment and network equipment will not be repeated here.

The embodiment of the present application provides a terminal device, which terminal device (referred to as UE for convenience of description) can be used in each of the foregoing embodiments. The terminal equipment includes corresponding means, units and/or circuits for implementing the UE functions described in the embodiments shown in FIG. 1, FIG. 2, FIG. 4, and/or FIG. 6. For example, the terminal device includes a transceiver module to support the terminal device to implement the transceiver function, and a processing module to support the terminal device to process signals.

Figure 15 shows a schematic structural diagram of a terminal device provided by an embodiment of the present application.

The terminal device 1500 can be applied to the system shown in Figure 1 and Figure 2 . For ease of explanation, FIG. 13 only shows the main components of the terminal device 1500. As shown in FIG. 13, the terminal device 1500 includes a processor, a memory, a control circuit, an antenna, and an input and output device. The processor is mainly used to process communication protocols and communication data, control the entire terminal device 1500, execute software programs, and process data of the software programs. Memory is mainly used to store software programs and data. The control circuit is mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals. Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, microphones, keyboards, etc., are mainly used to receive data input by users and output data to users.

Taking the terminal device 1500 as a mobile phone as an example, when the terminal device 1500 is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the control circuit. The control circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal out in the form of electromagnetic waves through the antenna. When data is sent to the terminal device 1500, the control circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. .

Those skilled in the art can understand that, for convenience of explanation, FIG. 15 only shows one memory and processor. In some embodiments, terminal device 1500 may include multiple processors and memories. The memory may also be called a storage medium or a storage device, which is not limited in the embodiments of the present application.

As an optional implementation method, the processor may include a baseband processor and a central processor. The baseband processor is mainly used to process communication protocols and communication data. The central processor is mainly used to control the entire terminal device 1500. Execute software programs and process data from software programs. The processor in Figure 13 integrates the functions of a baseband processor and a central processing unit. Those skilled in the art can understand that the baseband processor The belt processor and the central processing unit can also be independent processors, interconnected through technologies such as buses. The terminal device 1500 may include multiple baseband processors to adapt to different network standards, the terminal device 1500 may include multiple central processors to enhance its processing capabilities, and various components of the terminal device 1500 may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing communication protocols and communication data can be built into the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

In one example, the antenna and the control circuit with the transceiver function can be regarded as the transceiver unit 1510 of the terminal device 1500 , and the processor with the processing function can be regarded as the processing unit 1520 of the terminal device 1500 . As shown in Figure 13, the terminal device 1500 includes a transceiver unit 1510 and a processing unit 1520. The transceiver unit may also be called a transceiver, a transceiver, a transceiver device, etc. Optionally, the devices used to implement the receiving function in the transceiving unit 1510 can be regarded as receiving units, and the devices used in the transceiving unit 1510 used to implement the transmitting function can be regarded as sending units. That is, the transceiving unit 1510 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, a transmitting circuit, etc.

The transceiver unit may be used to perform the transceiver actions performed by the terminal device in the embodiments corresponding to FIG. 4 and FIG. 6 . For example, the first terminal device includes a transceiver unit and a processing unit. The transceiver unit is used to receive the first instruction information from the second terminal device. The processing unit is used for the first terminal device to perform channel access on the first channel. The transceiver unit is also used to perform channel access on the first channel. Used by the first terminal device to send the second instruction information to the second terminal device. Optionally, the transceiver unit is also configured to receive the first sideline information from the second terminal device on the second time-frequency resource. Correspondingly, the second terminal device also includes a transceiver unit and a processing unit, used to perform various actions in FIG. 4, FIG. 6 and communication method 700.

Those of ordinary skill in the art will appreciate that the units and steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical functional division. The units described as separate components may or may not be physically separated. As units The components shown may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present application or the part that contributes or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions to A computer device (which may be a personal computer, a server, or a network device, etc.) is caused to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned computer-readable storage medium can be any available medium that can be accessed by a computer. Taking this as an example but not limited to: computer-readable media can include random access memory (random access memory, RAM), read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), Erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD- ROM), universal serial bus flash disk, portable hard disk, or other optical disk storage, magnetic disk storage media, or other magnetic storage devices, or can be used to carry or store desired data in the form of instructions or data structures. program code and any other medium that can be accessed by a computer. In addition, by way of example and not limitation, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous RAM), etc. 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 link dynamic random access memory (synchlink DRAM) , SLDRAM) or direct memory bus random access memory (direct rambus RAM, DR RAM).

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

Claims (49)

1. A method for sending instruction information, characterized by including:

   The first terminal device receives first indication information from the second terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate the second terminal device. The first time-frequency resource reserved by the device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information;

   The first terminal device performs channel access on the first channel;

   When the priority of the information to be sent by the first terminal device is lower than the priority of the first sideline information, the first terminal device sends a message to the second terminal device on the first channel. Send second indication information, the second indication information is used to indicate that the second time-frequency resource in the channel occupancy time of the first channel is a time-frequency resource shared with the second terminal device, and the second time-frequency resource The time domain position is the same as the first time-frequency resource.
2. The method of claim 1, further comprising:

   The first terminal device determines the frequency domain location of the second time-frequency resource in the first channel according to the first time-frequency resource information.
3. The method according to claim 1 or 2, characterized in that,

   The first terminal device performing channel access on the first channel includes:

   The first terminal device performs channel listening on at least two channels, determines that the first channel is idle, and performs channel access on the first channel; or

   The first terminal device selects the first channel among at least two channels to perform channel listening, determines that the first channel is idle, and performs channel access on the first channel.
4. The method according to any one of claims 1-3, characterized in that,

   The first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or

   The first time-frequency resource is located on the second channel, and the second time-frequency resource is located on the first channel.
5. The method according to any one of claims 1-4, characterized in that the method further includes:

   The first terminal device receives the first sidelink information from the second terminal device on the second time-frequency resource.
6. The method according to any one of claims 1-5, characterized in that,

   The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
7. The method according to any one of claims 1-6, characterized in that,

   The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
8. A method for sending sideline information, which is characterized by including:

   The second terminal device sends first indication information to the first terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate the second time-frequency resource information. The first time-frequency resource reserved by the terminal device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information;

   The second terminal device receives second indication information from the first terminal device, and the second indication information is used to indicate that the second time-frequency resource in the channel occupancy time of the first channel is shared with the second terminal device. The time-frequency resources of the terminal device, the time domain positions of the second time-frequency resource and the first time-frequency resource are the same;

   The second terminal device sends the first sidelink information on the second time-frequency resource.
9. The method according to claim 8, wherein the second terminal device sending the first sidelink information on the second time-frequency resource includes:

   The second terminal device sends the first sidelink information to the first terminal device on the second time-frequency resource; or

   The second terminal device sends the first sidelink information to the third terminal device on the second time-frequency resource.
10. The method according to claim 8 or 9, characterized in that,

    The first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or

    The first time-frequency resource is located on the second channel, and the second time-frequency resource is located on the first channel.
11. The method according to any one of claims 8-10, characterized in that,

    The reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
12. The method according to any one of claims 8-11, characterized in that,

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
13. A communication method, characterized by including:

    The first terminal device receives first indication information from the second terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate the second terminal device. The first time-frequency resource reserved by the device, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to indicate the first The priority of row information on one side;

    When the priority of the second sidelink information to be sent by the first terminal device is lower than the priority of the first sidelink information, the first terminal device selects the first sidelink information among at least two channels. One channel performs channel access.
14. The method of claim 13, further comprising:

    During the process of channel access, the first terminal device determines that the first channel is idle;

    The first terminal device sends second indication information to the second terminal device, and the second indication information is used to indicate that the first time-frequency resource is a time-frequency resource shared with the second terminal device, so The first time-frequency resource is located within the channel occupation time of the first channel.
15. The method according to claim 13 or 14, characterized in that the method further includes:

    The first terminal device receives the first sidelink information from the second terminal device on the first time-frequency resource.
16. The method according to any one of claims 13-15, characterized in that,

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
17. The method according to any one of claims 13-16, characterized in that, before the first terminal device selects the first channel among at least two channels for channel access, the method further includes:

    The first terminal device receives third indication information from the third terminal device, the third indication information includes second time-frequency resource information and second priority information, and the second time-frequency resource information is used to indicate the The third time-frequency resource reserved by the third terminal device, the third time-frequency resource is used to send third sideline information, the third time-frequency resource is located in the second channel, and the second priority information is used to send Indicates the priority of the third sideline information, the at least two channels also include the second channel, and the priority of the third sideline information is lower than the priority of the first sideline information.
18. The method according to any one of claims 13-17, characterized in that,

    The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
19. A communication method, characterized by including:

    The second terminal device sends first indication information to the first terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate to the second terminal device The reserved first time-frequency resource, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to indicate the first Priority of lateral information;

    The second terminal device receives second indication information from the first terminal device, the second indication information is used for the first time-frequency The resources are time-frequency resources shared with the second terminal device;

    The second terminal device sends the first sidelink information on the first time-frequency resource.
20. The method of claim 19, wherein the second terminal device sending the first sidelink information on the first time-frequency resource includes:

    The second terminal device sends the first sidelink information to the first terminal device on the first time-frequency resource; or

    The second terminal device sends the first sidelink information to the third terminal device on the first time-frequency resource.
21. The method according to claim 19 or 20, characterized in that,

    The first time-frequency resource is located within the channel occupancy time of the first channel, and the channel occupancy time of the first channel is obtained by the first terminal device.
22. The method according to any one of claims 19-21, characterized in that,

    The reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
23. The method according to any one of claims 19-22, characterized in that,

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
24. A communication device including a transceiver unit and a processing unit, wherein,

    The transceiver unit is configured to receive first indication information from a second terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate The first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information;

    The processing unit is used to perform channel access on the first channel;

    The transceiver unit is also configured to: when the priority of the information to be sent by the first terminal device is lower than the priority of the first sideline information, the first terminal device transmits the information on the first channel. Send second indication information to the second terminal device, where the second indication information is used to indicate that the second time-frequency resource in the channel occupancy time of the first channel is a time-frequency resource shared with the second terminal device. , the second time-frequency resource has the same time domain position as the first time-frequency resource.
25. The communication device according to claim 24, characterized in that:

    The processing unit is further configured for the first terminal device to determine the frequency domain position of the second time-frequency resource in the first channel according to the first time-frequency resource information.
26. The communication device according to claim 24 or 25, characterized in that:

    The processing unit is specifically configured to perform channel listening on at least two channels, determine that the first channel is idle, and perform channel access on the first channel; or

    The processing unit is specifically configured to select the first channel among at least two channels for channel listening, determine that the first channel is idle, and perform channel access on the first channel.
27. The communication device according to any one of claims 24-26, characterized in that:

    The first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or

    The first time-frequency resource is located on the second channel, and the second time-frequency resource is located on the first channel.
28. The communication device according to any one of claims 24-27, characterized in that:

    The transceiver unit is further configured to receive the first sideline information from the second terminal device on the second time-frequency resource.
29. The communication device according to any one of claims 1-28, characterized in that,

    The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
30. The communication device according to any one of claims 1-29, characterized in that,

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
31. A communication device including a transceiver unit and a processing unit, wherein,

    The transceiver unit is configured to send first indication information to the first terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate the first time-frequency resource information. The first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sideline information, and the first priority information is used to indicate the priority of the first sideline information;

    The transceiver unit is also configured to receive second indication information from the first terminal device. The second indication information is used to indicate that the second time-frequency resource in the channel occupancy time of the first channel is shared with the first terminal device. The time-frequency resource of the second terminal device, the time-domain position of the second time-frequency resource and the first time-frequency resource are the same;

    The transceiver unit is also configured to send the first sideline information on the second time-frequency resource.
32. The communication device according to claim 31, characterized in that:

    The transceiver unit is specifically configured to send the first sideline information to the first terminal device on the second time-frequency resource; or

    The transceiver unit is specifically configured to send the first sidelink information to the third terminal device on the second time-frequency resource.
33. The communication device according to claim 31 or 32, characterized in that:

    The first time-frequency resource is located on the first channel, and the second time-frequency resource is the same as the first time-frequency resource; or

    The first time-frequency resource is located on the second channel, and the second time-frequency resource is located on the first channel.
34. The communication device according to any one of claims 31-33, characterized in that:

    The reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
35. The communication device according to any one of claims 31-34, characterized in that:

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
36. A communication device including a transceiver unit and a processing unit, wherein,

    The transceiver unit is configured to receive first indication information from a second terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate The first time-frequency resource reserved by the second terminal device, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to indicate The priority of the first sideline information;

    The processing unit is configured to select the second sideline information from at least two channels when the priority of the second sideline information to be sent by the first terminal device is lower than the priority of the first sideline information. The first channel performs channel access.
37. The communication device according to claim 36, characterized in that:

    The processing unit is further configured to determine that the first channel is idle during the channel access process;

    The transceiver unit is further configured to send second indication information to the second terminal device, where the second indication information is used to indicate that the first time-frequency resource is a time-frequency resource shared with the second terminal device. , the first time-frequency resource is located within the channel occupation time of the first channel.
38. The communication device according to claim 36 or 37, characterized in that:

    The transceiver unit is further configured to receive the first sideline information from the second terminal device on the first time-frequency resource.
39. The communication device according to any one of claims 36-38, characterized in that:

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
40. The communication device according to any one of claims 36 to 39, characterized in that, before selecting the first channel among at least two channels for channel access,

    The transceiver unit is also configured to receive third indication information from a third terminal device. The third indication information includes second time-frequency resource information and second priority information. The second time-frequency resource information is used to Indicates the third time-frequency resource reserved by the third terminal device, the third time-frequency resource is used to send third sideline information, the third time-frequency resource is located in the second channel, and the second priority information Used to indicate the priority of the third sideline information, the at least two channels also include the second channel, the priority of the third sideline information is lower than the priority of the first sideline information .
41. The communication device according to any one of claims 36-40, characterized in that,

    The sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
42. A communication device including a transceiver unit and a processing unit, wherein,

    The transceiver unit is configured to send first indication information to the first terminal device. The first indication information includes first time-frequency resource information and first priority information. The first time-frequency resource information is used to indicate the first time-frequency resource information. The first time-frequency resource reserved by the two terminal devices, the first time-frequency resource is used to send the first sidelink information, the first time-frequency resource is located on the first channel, and the first priority information is used to indicate the Describe the priority of the first sideline information;

    The transceiver unit is also configured to receive second indication information from the first terminal device, where the first time-frequency resource is a time-frequency resource shared with the second terminal device. ;

    The transceiver unit is further configured to send the first sideline information on the first time-frequency resource.
43. The communication device according to claim 42, characterized in that:

    The transceiver unit is specifically configured to send the first sideline information to the first terminal device on the first time-frequency resource; or

    The transceiver unit is specifically configured to send the first sideline information to the third terminal device on the first time-frequency resource.
44. The communication device according to claim 42 or 43, characterized in that:

    The first time-frequency resource is located within the channel occupancy time of the first channel, and the channel occupancy time of the first channel is obtained by the first terminal device.
45. The communication device according to any one of claims 42-44, characterized in that:

    The reception time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.
46. The communication device according to any one of claims 42-45, characterized in that:

    The first indication information is physical layer sidelink control information, or media access control layer sidelink control information, or radio resource control layer sidelink control information.
47. A communication device, characterized in that the communication device includes a processor; the processor is used to run a computer program or instructions, so that the communication device performs the method according to any one of claims 1-7 , or to cause the communication device to perform the method as described in any one of claims 8-12, or to make the communication device perform the method as described in any one of claims 13-18, or to The communication device is caused to perform the method according to any one of claims 19-23.
48. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions or programs. When the computer instructions or programs are run on the computer, the method according to any one of claims 1-7 is performed. Executed, or so that the communication device executes the method as described in any one of claims 8-12, or so that the communication device executes the method as described in any one of claims 13-18 as Execution, or to cause the communication device to execute the method according to any one of claims 19 to 23 is executed.
49. A computer program product, characterized in that the computer program product includes computer instructions; when part or all of the computer instructions are run on a computer, the method according to any one of claims 1-7 is executed, Or, so that the communication device performs the method as described in any one of claims 8-12, or, so that the communication device performs the method as described in any one of claims 13-18, Or, the method is performed to cause the communication device to perform the method described in any one of claims 19-23.