WO2024032324A1

WO2024032324A1 - Communication method and communication apparatus

Info

Publication number: WO2024032324A1
Application number: PCT/CN2023/107872
Authority: WO
Inventors: 易凤; 苏宏家; 卢磊
Original assignee: 华为技术有限公司
Priority date: 2022-08-12
Filing date: 2023-07-18
Publication date: 2024-02-15
Also published as: CN117650875A

Abstract

A communication method and a communication apparatus. The method may comprise: a first terminal apparatus determines a first channel occupancy time (COT) by means of a channel access; the first terminal apparatus acquires first configuration information, the first configuration information being used for indicating PSFCH period configuration of a sidelink resource pool; the first terminal apparatus determines a first PSFCH time unit set in the first COT according to the first configuration information; and the first terminal apparatus sends first sidelink instruction information, the first sidelink instruction information instructing a second terminal apparatus to send in a second PSFCH time unit set sidelink feedback information, and the second PSFCH time unit set belonging to the first PSFCH time unit set. On the basis of PSFCH periodic configuration, the method indicates a PSFCH time unit activated within a COT, which is used to feed back the reception situation of sidelink transmission, thus helping to improve reliability of sidelink transmission.

Description

Communication method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 12, 2022, with application number 202210968012.8 and the application title "Communication Method and Communication Device", the entire content of which is incorporated into this application by reference. .

Technical field

The embodiments of the present application relate to the field of communication, and more specifically, to a communication method and a communication device.

Background technique

In wireless communication systems, spectrum resources can be divided into licensed spectrum and unlicensed spectrum. In unlicensed spectrum, terminals can use spectrum resources in a competitive manner. One possible way is that the terminal competes for the channel through listen-before-talk (LBT), and then uses the channel resources. If the terminal LBT succeeds, the terminal can use the channel resources to send data; if the terminal LBT fails, the terminal cannot use the channel resources and thus cannot send data. Currently, enabling unlicensed spectrum is an important evolution direction in sidelink (SL) communications.

In data transmission, one terminal sends data to another terminal, and the other terminal can send feedback information of the data to the one terminal according to the reception situation of the data. In SL unlicensed spectrum communication, how to perform sidelink feedback is an issue worth considering.

Contents of the invention

The present application provides a communication method and a communication device to provide a sidelink feedback solution in SL communication and to increase the probability that the terminal device successfully feeds back the sidelink feedback information as much as possible.

The first aspect provides a communication method, which can be executed by a terminal device, or can also be executed by a component (such as a chip or circuit) of the terminal device, which is not limited in this application. For convenience of description, the following description takes execution by the first terminal device as an example.

The method may include: the first terminal device determines the first channel occupancy time COT through channel access; the first terminal device obtains first configuration information, the first configuration information is used to indicate the PSFCH cycle configuration of the sidelink resource pool ; The first terminal device determines the first PSFCH time unit set in the first COT according to the first configuration information; the first terminal device sends first sideline indication information, and the first sideline indication information indicates the second terminal device The sidelink feedback information is sent in the second PSFCH time unit set; the second PSFCH time unit set belongs to the first PSFCH time unit set.

Based on the above technical solution, through this method, the first terminal device determines the periodic configuration of the PSFCH time unit in the resource pool according to the first configuration information. Based on the periodic configuration of the PSFCH, the activated PSFCH time unit in the first COT is indicated, using Feedback on the reception status of sideline transmission is beneficial to improving the reliability of sideline transmission.

In conjunction with the first aspect, in some implementations of the first aspect, PSFCH time units in the first PSFCH time unit set except the second PSFCH time unit set may be used for PSSCH transmission. That is, when the PSFCH time unit is unavailable or inactive, it is used for sidelink information transmission, which is beneficial to improving resource utilization.

In conjunction with the first aspect, in some implementations of the first aspect, the time units included in the second PSFCH time unit set are time units in an activated state in the first PSFCH time unit set.

With reference to the first aspect, in some implementations of the first aspect, the first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the M PSFCH time units. Activated state, M is a positive integer.

Based on the above technical solution, through this method, the first sideline indication information indicates the activation status of each time unit in the first PSFCH time unit set, where the PSFCH time units in the activated state constitute the second PSFCH time unit set.

With reference to the first aspect, in some implementations of the first aspect, the first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship : L=(M _COT *2 ^u )/N _PSFCH , where u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is the first COT. A configuration information configured.

With reference to the first aspect, in some implementations of the first aspect, the first PSFCH time unit set includes M PSFCH time units. element, the first sideline indication information includes Q bits, each P bit is used to indicate the activation status of the PSFCH time unit of k consecutive time slots, and the P and Q satisfy the following relationship: Among them, u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is configured by the first configuration information.

The second aspect provides a communication method, which can be executed by a terminal device, or can also be executed by a component (such as a chip or circuit) of the terminal device, which is not limited in this application. For convenience of description, the following description takes execution by the second terminal device as an example.

The method may include: the second terminal device obtains the first configuration information; the second terminal device determines the first PSFCH time unit set in the first COT according to the first configuration information; the second terminal device receives the data from the first terminal. First sidelink indication information of the device, the first sidelink indication information indicates sending sidelink feedback information in a second PSFCH time unit set, and the second PSFCH time unit set belongs to the first PSFCH time unit set.

In conjunction with the second aspect, in some implementations of the second aspect, the time units included in the second PSFCH time unit set are time units in an activated state in the first PSFCH time unit set.

Combined with the second aspect, in some implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the M PSFCH time units. Activated state, M is a positive integer.

Combined with the second aspect, in some implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship : L=(M _COT *2 ^u )/N _PSFCH , where u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is the first COT. A configuration information configured.

Combined with the second aspect, in some implementations of the second aspect, the first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information includes Q bits, and each P bit is used to Indicates the activation status of the PSFCH time unit of k consecutive time slots. The P and Q satisfy the following relationship: Among them, u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is configured by the first configuration information.

In the third aspect, a communication method is provided, which can be executed by a terminal device, or can also be executed by a component (such as a chip or circuit) of the terminal device, which is not limited in this application. For convenience of description, the following description takes execution by the first terminal device as an example.

The method may include: the first terminal device determines a first sidelink feedback resource corresponding to the first sidelink resource; and when the first condition is met, the first terminal device sends a message on the first sidelink feedback resource. Second information, the second information is used to occupy the first sidelink feedback resource.

With reference to the third aspect, in some implementations of the third aspect, the first condition includes one of the following: the first sidelink resource is used by the first terminal device to send the first Side-link information; the time interval between the first side-link resource and the first side-link feedback resource is less than a first threshold; the first side-link resource is used for the first terminal device to transmit broadcast services; the The first sidelink resource and the first sidelink feedback resource are located on the first channel, and the energy detected by the first terminal device within a first time period before the time domain position of the first sidelink resource is lower than a third Two thresholds; or the first terminal device does not detect the sidelink control information SCI within the first time period before the time domain position of the first sidelink resource.

With reference to the third aspect, in some implementations of the third aspect, the first sidelink resource is located in the first COT of the first channel; the first COT is determined by the first terminal device or the The first COT is shared by the second terminal device to the first terminal device.

In conjunction with the third aspect, in some implementations of the third aspect, the first sidelink feedback resource includes a common sidelink feedback resource.

Combined with the third aspect, in some implementations of the third aspect, the first side row feedback resource includes a second side row feedback resource and a third side row feedback resource, and the second side row feedback resource is the same as the said side row feedback resource. The first sidelink resource is located on the same channel, the third sidelink feedback resource is located on a different channel from the first sidelink resource, and the first terminal device sends a second sidelink feedback resource on the first sidelink feedback resource. Information includes: the first terminal device sends second information on the second sideline feedback resource.

The method may include: the second terminal device determines a first sidelink feedback resource corresponding to the first sidelink resource, and the first sidelink feedback information is used by the second terminal device to receive the first sidelink information; when the first sidelink information is satisfied; Under one condition, the first terminal device sends third information on the first sideline feedback resource, and the third information is used to occupy the first sideline feedback resource.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first condition includes one of the following: the first sideline information is sent through blind retransmission; the first sideline The information belongs to the broadcasting business.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first sidelink resource is located in the first COT of the first channel, and the first sidelink resource is shared by other terminal devices to the second terminal device.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the first sidelink feedback resource includes a common sidelink feedback resource.

In a fifth aspect, a communication device is provided. The device includes a processing unit and a transceiver unit.

The processing unit is used to determine the first channel occupancy time COT through channel access; the transceiver unit is used to obtain the first configuration information, the first configuration information is used to indicate the PSFCH cycle configuration of the sidelink resource pool; the processing unit is also The transceiver unit is configured to determine the first PSFCH time unit set in the first COT according to the first configuration information; the transceiver unit is also configured to send the first sideline indication information, and the first sideline indication information indicates that the second terminal device is in the second Sidelink feedback information is sent in a PSFCH time unit set; the second PSFCH time unit set belongs to the first PSFCH time unit set.

A sixth aspect provides a communication device. The device includes a processing unit and a transceiver unit. The transceiver unit is used to obtain the first configuration information; the processing unit is used to determine the first PSFCH time unit set in the first COT according to the first configuration information; the transceiver unit is also used to receive the first side from the first terminal device. Row indication information, the first side-link indication information indicates sending side-link feedback information in a second PSFCH time unit set, and the second PSFCH time unit set belongs to the first PSFCH time unit set.

Combined with the fifth and sixth aspects, in some implementations, PSFCH time units in the first PSFCH time unit set except the second PSFCH time unit set may be used for PSSCH transmission. That is, when the PSFCH time unit is unavailable or inactive, it is used for sidelink information transmission, which is beneficial to improving resource utilization.

Combined with the fifth and sixth aspects, in some implementations, the time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set.

Combined with the fifth and sixth aspects, in some implementations, the first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate activation of the M PSFCH time units. state, M is a positive integer.

Combined with the fifth and sixth aspects, in some implementations, the first PSFCH time unit set includes M PSFCH time units, the first side row indication information includes L bits, and the L satisfies the following relationship: L=(M _COT *2 ^u )/N _PSFCH , where u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is the first Configuration information configured.

Combined with the fifth and sixth aspects, in some implementations, the first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information includes Q bits, and each P bit is used to indicate The activation status of the PSFCH time unit of k consecutive time slots, the P and Q satisfy the following relationship: Among them, u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is configured by the first configuration information.

In a seventh aspect, a communication device is provided. The device includes a processing unit and a transceiver unit. a processing unit, configured to determine the first side-link feedback resource corresponding to the first side-link resource; a transceiver unit, configured to, when the first condition is met, the first terminal device on the first side-link feedback resource Send second information, where the second information is used to occupy the first sideline feedback resource.

With reference to the seventh aspect, in some implementations, the first condition includes one of the following: the first sidelink resource is used by the first terminal device to send the first sidelink information through blind retransmission. ; The time interval between the first sidelink resource and the first sidelink feedback resource is less than a first threshold; the first sidelink resource is used for the first terminal device to transmit broadcast services; the first sidelink resources with the first side row The feedback resource is located on the first channel, and the energy detected by the first terminal device within the first time period before the time domain position of the first sidelink resource is lower than the second threshold; or the first terminal device is located at the first sidelink resource. The sidelink control information SCI is not detected within the first time period before the time domain position of the first sidelink resource.

Combined with the seventh aspect, in some implementations, the first sidelink resource is located in the first COT of the first channel. The first COT is determined by the first terminal device, or the first COT is shared by the second terminal device to the first terminal device.

In conjunction with the seventh aspect, in some implementations, the first sidelink feedback resource includes a public sidelink feedback resource.

In an eighth aspect, a communication device is provided. The device includes a processing unit and a transceiver unit. a processing unit, configured to determine a first sidelink feedback resource corresponding to a first sidelink resource, and the first sidelink feedback information is used by the second terminal device to receive the first sidelink information; a transceiver unit, configured to satisfy In the case of the first condition, third information is sent on the first sidelink feedback resource, and the third information is used to occupy the first sidelink feedback resource.

Combined with the eighth aspect, in some implementations, the first condition includes one of the following: the first sideline information is sent through blind retransmission; the first sideline information belongs to a broadcast service .

A ninth aspect provides a communication method, which can be executed by a terminal device, or can also be executed by a component (such as a chip or circuit) of the terminal device, which is not limited in this application. For convenience of description, the following description takes execution by the first terminal device as an example.

For the tenth aspect, reference can be made to the relevant designs in the first aspect. For the beneficial effects of the ninth aspect, reference can be made to the relevant descriptions of the first aspect, which will not be described again here.

In an eleventh aspect, a communication device is provided, which is used to perform the method in any of the possible implementation manners of the first to fourth aspects. Specifically, the device may include units and/or modules for performing the method in any possible implementation of the first to fourth aspects, such as a processing unit and/or a communication unit.

In one implementation, the device is a terminal device. When the device is a terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the device is a chip, a chip system or a circuit for a terminal device. When the device is a chip, chip system or circuit for terminal equipment, the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit, etc. ; The processing unit may be at least one processor, processing circuit or logic circuit, etc.

A twelfth aspect, a communication device is provided, which device includes: at least one processor for executing computer programs or instructions stored in a memory to perform the method in any of the possible implementations of the first to fifth aspects. . Optionally, the device further includes a memory for storing computer programs or instructions. Optionally, the device further includes a communication interface, through which the processor reads the computer program or instructions stored in the memory.

In one implementation, the device is a terminal device.

In another implementation, the device is a chip, a chip system or a circuit for a terminal device.

In a thirteenth aspect, the present application provides a processor for executing the methods provided in the above first to fifth aspects.

For operations such as sending and getting/receiving involved in the processor, if there is no special explanation, or if it does not conflict with its actual role or internal logic in the relevant description, it can be understood as processor output, reception, input and other operations. , can also be understood as the transmitting and receiving operations performed by the radio frequency circuit and the antenna, which is not limited in this application.

In a fourteenth aspect, a computer-readable storage medium is provided. The computer-readable medium stores a program code for device execution. The program code includes a program code for executing any of the possible implementations of the above-mentioned first to fifth aspects. Methods.

In a fifteenth aspect, a computer program product containing instructions is provided. When the computer program product is run on a computer, it causes the computer to execute the method in any of the possible implementation modes of the first to fifth aspects.

In a sixteenth aspect, a communication system is provided, including at least one of the aforementioned first terminal device and second terminal device.

Description of drawings

Figure 1 shows a schematic diagram of a wireless communication system suitable for an embodiment of the present application.

Figure 2 shows a schematic diagram of a wireless communication system suitable for another embodiment of the present application.

Figure 3 is a schematic diagram of PSFCH configuration provided by an embodiment of the present application.

Figure 4 is a schematic diagram of a communication method provided by an embodiment of the present application.

Figure 5 is a schematic diagram of a PSFCH time unit indication provided by an embodiment of the present application.

Figure 6 is a schematic diagram of another PSFCH time unit indication provided by an embodiment of the present application.

Figure 7 is another schematic diagram of PSFCH time unit indication provided by the embodiment of the present application.

Figure 8 is another schematic diagram of PSFCH time unit indication provided by the embodiment of the present application.

Figure 9 is a schematic diagram of correspondence between PSSCH and PSFCH provided by an embodiment of the present application.

Figure 10 shows a schematic diagram in which one PSSCH corresponds to multiple PSFCH time units.

Figure 11 shows a schematic diagram of a public PSFCH resource.

Figure 12 shows a schematic diagram of public PSFCH resources.

Figure 13 shows a schematic diagram of a public PSFCH resource.

Figure 14 shows a schematic diagram of a communication device 1400.

Figure 15 shows a schematic diagram of a communication device 1500.

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 the D2D link defined by the 3rd generation partnership project (3GPP) version (release, Rel)-12/13, and there is also the D2D link defined by 3GPP for the Internet of Vehicles. The vehicle-to-everything link. It should be understood that V2X specifically includes vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-pedestrian (V2P) direct communication. communications, 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 into the same physical device. It can also be a physical device that integrates the functions of part of the core network equipment and part of the functions of the 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 .

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, user equipment (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 can 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 uses the built-in vehicle-mounted module, vehicle-mounted module, Vehicle-mounted components, vehicle-mounted chips or vehicle-mounted units can implement the method of the present application.

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 smart grid, industrial control, intelligent transportation, intelligent The control center in the above application scenarios such as smart cities. 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 based on random back-off. Before accessing the channel and starting to send data, the UE first senses whether the channel is idle. If the channel has been idle for a certain period of time, you can occupy the channel. If the channel is not idle, you need to wait until the channel returns to idle before you can occupy the channel. One possible implementation method uses energy-based detection and signal type detection to determine whether the channel is idle. Taking energy detection as an example, when the detected energy exceeds the detection threshold, it is determined that the channel is busy, that is, access to the channel is not allowed. When the detected energy is lower than the detection threshold and continues for more than a period of time, the channel is determined to be idle, that is, access to the channel is allowed.

As an example, the UE performs LBT on every 20 MHz channel. In order to avoid interference from different channels, the UE does not send data on the entire 20MHz bandwidth, but leaves a part of the frequency band resources as a guard band, and sends data on the remaining frequency domain resources. The available resources for sending data can be It is called a resource block set (RB set). When the UE performs LBT operations on multiple consecutive 20MHz channels and successfully accesses the channel, the protection bandwidth between RB sets can be used to transmit data and improve resource utilization. In the embodiment of this application, LBT channel, channel, and RB set are sometimes used interchangeably.

Unlicensed spectrum resources can be shared between UEs. For example, if a UE obtains the channel usage right through LBT, the UE can occupy the channel for a period of time, which can be called channel occupancy time (COT); the UE can use the channel in the COT The usage rights are shared with other devices, that is, the UE can share the resources shared within the COT, including time domain resources and frequency domain resources, with other devices; other devices can send data through the resources shared by the UE.

As an example, LBT mechanisms are generally divided into the following four categories.

Category 1 LBT (category 1 LBT, Cat 1 LBT): sent immediately after a short switching gap (switching gap), used for communication equipment to send immediately after the switching interval from receiving state to sending state in COT. Among them, the conversion interval time generally cannot be greater than 16us.

Category 2 LBT (Category 2 LBT, Cat 2 LBT): LBT without random backoff, which is used by communication equipment to transmit without random backoff after detecting that the channel is idle for a certain period of time.

Category 3 LBT (Category 3 LBT, Cat 3 LBT): LBT with random backoff of a fixed-size contention window. It is used by the communication device to generate a random number N based on the fixed-size contention window, and when the communication device detects that the channel is in Idle state and lasts for a period of time It can be sent after a time determined by the random number N. Among them, the size of the competition window is related to the minimum and maximum values of N.

Category 4 LBT (Category 4 LBT, Cat 4 LBT): LBT with random backoff of variable-size contention window, used by communication equipment to generate a random number N based on the variable-size contention window, and detect that the channel is in an idle state And it can be sent after a period of time determined by the random number N. The size of the contention window is related to the minimum value and the maximum value of N, and the communication device can change the size of the contention window.

NR-U equipment follows the 3GPP protocol and uses the LBT mechanism as the channel access method. Specifically, NR-U equipment uses the following types of LBTs.

Type 1 LBT: Cat 4 LBT. The NR-U device needs to perform random backoff before it can access the channel and send data. Specifically, the network device or the terminal device can listen to the channel for the first time after the channel is idle for a period of extended duration (defer sensing) (record this time as T _d ), and in the following steps After the counter N in 4 reaches zero, the transmission is initiated. Specifically, the counter N is adjusted by listening to the channel to obtain additional listening slot periods according to the following steps.

Step 1: Set N=N _init and then perform step 4. Among them, N _init is a random number ranging from 0 to CW _p , and CW _p is the contention window.

Step 2: If N>0, the network device or terminal device chooses to decrease the counter value, such as setting N=N-1.

Step 3: Listen to the channel to obtain additional listening time slot periods. If the channel for the additional listening time slot period is idle, perform step 4; otherwise, perform step 5.

Step 4: If N=0, stop; otherwise, perform step 2.

Step 5: Listen to the channel until the channel is heard to be busy within another T _d or until all listening slots within 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, proceed to step 4; otherwise, proceed to step 5.

The above T _d includes T _f =16us and subsequent m _p consecutive listening slot periods (denoted as T _sl ). See Table 1 for the value of m _p . Among them, CW _min,p is the minimum value of the competition window, CW _max,p is the maximum value of the competition window, W _min,p ≤CW _p ≤CW _max,p . T _mcot,p is the maximum length of COT, that is, the COT transmitted by network equipment or terminal equipment on the channel does not exceed T _mcot,p .

Table 1

Type 2A LBT: Cat 2 LBT with 25us interval. The NR-U device can access the channel and send data after sensing that the channel is idle for 25us.

Type 2B LBT: Cat 2 LBT with 16us interval. The NR-U device can access the channel and send data after sensing that the channel is idle for 16us.

Type 2C LBT: Cat 1 LBT with up to 16us spacing. The NR-U device does not need to listen to the channel. It can directly access the channel and send data after a conversion interval of up to 16us in the COT.

5. Interleaving: The protocol defines interlaces of resource blocks, hereinafter referred to as interlaces. Interleaved m can be composed of common resource blocks (CRB) {m, M+m, 2M+m, 3M+m,…}. Where M is the staggered number, and there are m∈{0,1,…,M-1}. Optionally, the value of M is related to the sub-carrier space (SCS). For example, when μ=0 (that is, the subcarrier spacing is 15 kHz), the value of M is 10. For another example, when μ=1 (that is, the subcarrier spacing is 30 kHz), the value of M is 5.

6. SL communication resource pool: SL communication can be performed based on the resource pool. The so-called resource pool refers to a block dedicated to SL Time-frequency resources for communication; or the resource pool can also be understood as a collection of resources that can be used for SL communication, that is, a collection of time domain resources and frequency domain resources for SL communication.

The resource pool used for SL communication may be simply called a resource pool, or may also be called an SL resource pool. The following is concise and uses resource pools to describe it. The resource pool can also be called a channel, an operating channel, a nominal channel bandwidth, and a bandwidth. That is, the resource pool, channel, and bandwidth are all used to represent the set of resources that can be used for SL communication. There are no restrictions on the naming of resource pools.

For time domain resources in the resource pool, as an example, the network device can adopt a bitmap and periodically repeat the bitmap to indicate the set of subframes used for SL communication among all subframes of the system.

(a) of FIG. 3 shows a schematic diagram in which available subframes for SL communication are indicated through a bitmap. As shown in (a) of Figure 3, the length of the bitmap is 8 bits. Among them, the number of symbols occupied by SL communication in each subframe is M symbols, and M is an integer greater than or equal to 1. M can be considered as an SL time domain transmission duration or time domain transmission unit.

For frequency domain resources in the resource pool, as an example, the network device can divide the frequency band used for SL communication into several sub-channels, and each sub-channel contains a certain number of resource blocks.

(b) of FIG. 3 shows a schematic diagram of frequency domain resources in the resource pool. As shown in (b) of Figure 3, the network device may indicate the following parameters: the sequence number of the first resource block of the frequency resource used for SL communication, the total number N of sub-channels included in the resource pool, and the number of sub-channels included in each sub-channel. The number of resource blocks n _CH . One SL transmission can occupy one or more sub-channels. When scheduling SL communication resources, scheduling can be performed at sub-channel granularity in the frequency domain.

7. Physical side link feedback channel (PSFCH) resources: PSFCH resources represent resources used to transmit PSFCH. As an example, one PSFCH occupies 2 consecutive OFDM symbols in the time domain and 1 PRB in the frequency domain.

As a possible scenario, PSFCH can be used to transmit feedback information. For example, for a physical side link share channel (PSSCH) transmission, if the sender carries hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback enable in the control information information, the receiving end can feed back corresponding affirmative (ACK) or negative (negative acknowledgment, NACK) information based on the decoding result of this PSSCH. The ACK or NACK information is transmitted through PSFCH.

It can be understood that the above is an exemplary description and is not limiting. For example, PSFCH can also be used for inter-UE coordination scheme 2 (Scheme2) conflict indication. That is to say, if PSFCH resources are configured in the resource pool, all of the PSFCH resources can be used to transmit a certain type of information, such as feedback information, such as ACK/NACK, and conflict indication; or part of the PSFCH resources can be used to transmit one type of information, and part of Transmitting another type of information, such as partly used for feedback information and partly used for Scheme2 conflict indication, is not restricted.

PSFCH resources may be periodic resources configured in a resource pool. For example, assume that the period parameter is As an example, The value of can be 0, 1, 2, 4. like It means that there are no PSFCH resources in the resource pool, that is, the resources in the resource pool cannot be used to transmit PSFCH. like It means that in this resource pool, every time within a time window There will be one PSFCH resource for each SL time slot.

(c) of Figure 3 shows a schematic diagram of PSFCH resource configuration in the resource pool. As shown in (c) of Figure 3, if the PSFCH period is 1, that is Then there will be one PSFCH resource for each SL time slot in a time window. If the PSFCH period is 2, that is Then there will be one PSFCH resource for every 2 SL time slots in a time window. If the PSFCH period is 4, that is Then there will be one PSFCH resource for every 4 SL time slots in a time window.

It can be seen from (c) of Figure 3 that if PSFCH resources are configured on the resource pool, each PSFCH resources are configured once per time slot. The following is a brief introduction to the steps for determining the PSFCH resources corresponding to each sub-channel. The steps described below are exemplary descriptions and are not limited by this application.

Step 1: The resource pool configures the bitmap of the PSFCH frequency domain resource. The bitmap is used to indicate whether the PRB on the frequency domain resource where the resource pool is located can be used as a PSFCH resource.

Among them, the length of the bit information contained in the bitmap is equal to the number of PRBs in the resource pool. The PRB corresponding to the bit value "1" in the bitmap can be used to transmit PSFCH, and the PRB corresponding to the bit value "0" in the bitmap cannot be used to transmit PSFCH. Further, if the PSFCH resource is used to transmit HARQ-ACK, the PSFCH resource can be represented by the "sl-PSFCH-RB-Set" bitmap, that is, the PRB corresponding to the bit value "1" in the bitmap can be used to transmit HARQ-ACK , the PRB corresponding to the bit value "0" in the bitmap cannot be used to transmit HARQ-ACK. If the PSFCH resource is used for Scheme2 conflict indication, the PSFCH resource can be represented by the "sl-RB-SetPSFCH" bitmap, that is, the PRB corresponding to the bit value "1" in the bitmap can be used for Scheme2 conflict indication, and the bit value in the bitmap is The PRB corresponding to "0" cannot be used for Scheme2 conflict indication. As an example, the positions with a bit value of 1 in "sl-PSFCH-RB-Set" and "sl-RB-SetPSFCH" do not overlap. This can avoid the same position being used to transmit HARQ-ACK and Scheme2 conflicts. instruct.

(d) of Figure 3 shows another schematic diagram of PSFCH resource configuration in the resource pool. As shown in (d) of Figure 3, assuming that a sub-channel contains 10 PRBs and there are 3 sub-channels in the SL resource pool, the bitmap indicating the PSFCH frequency domain resources in the SL resource pool contains a total of 3*10=30 bits , to indicate whether each PRB can be used to transmit PSFCH. This bitmap can be used to indicate HARQ-ACK resources or scheme2 conflict indication resources. Taking the example shown in (d) of Figure 3 as an example, the bitmap indicates that the first 4 PRBs of some sub-channels can be used to transmit PSFCH, the first 2 PRBs of some sub-channels can be used to transmit PSFCH, and the middle 2 PRBs of some sub-channels can be used to transmit PSFCH. A PRB can be used to transmit PSFCH.

Step 2: Determine the number of PSFCH resources corresponding to each sub-channel. For example, since each A PSSCH time slot corresponds to a PSFCH time slot. For a resource pool containing N _sub- channels, the number of PSFCH resources corresponding to each sub-channel is in, Indicates the number of PRBs of PSFCH frequency domain resources, that is, the total number of bits with a value of 1 in the bitmap indicating PSFCH frequency domain resources.

Step 3: Determine the time domain position of PSFCH. Considering the decoding capability of the receiving end, the receiving end cannot provide feedback immediately after receiving the PSSCH. Therefore, the standard defines a PSSCH feedback time interval K, that is, the PSSCH transmits the PSFCH in the first available time slot containing the PSFCH resource. The gap between the time slot and the time slot where the PSSCH is located is at least K time slots.

(e) of Figure 3 shows a schematic diagram of the time domain resources of the PSSCH corresponding to the PSFCH. As shown in (e) of Figure 3, when K=2, the PSSCH carried on time slots 0 and 1 can be fed back on the PSFCH resource on time slot 3, and the PSSCH carried on time slots 2, 3, 4, and 5 can be fed back on the PSFCH resource on time slot 3. Feedback on the PSFCH resource where time slot 7 is located. Since time slots 2, 3, 4, and 5 are fed back on the PSFCH resource of one time slot, time slots 2, 3, 4, and 5 can also be called a PSSCH binding window length.

Step 4: The available PSFCH resources in a PSFCH feedback time slot are sequentially allocated to each sub-channel within the feedback period in a time domain first and then frequency domain manner.

(f) of Figure 3 shows a schematic diagram of PSFCH frequency domain resource allocation. As shown in (f) of Figure 3, after receiving the PSSCH, the terminal can feed back the PSFCH. The time interval between the PSSCH and the PSFCH is K. when When , the PSFCH resources corresponding to each sub-channel in the four bundled PSSCH time slots are as numbered in the figure, that is, a PRB PSFCH resource is allocated to each sub-channel of each time slot. Expressed by the formula: for For the i-th time slot among the bundled PSSCH time slots, if the frequency domain subchannel number in its resource pool is j, then its corresponding PSFCH resource is: If the terminal occupies two sub-channels for transmission, such as the PSSCH shown by the black square in (f) of Figure 3, the corresponding PSFCH resources are also 5 and 9 respectively, which are discontinuous in the frequency domain.

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:

Terminal equipment sharing COT can be understood as: the terminal equipment shares part of the time-frequency resources in the COT with other terminal equipment.

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.

In the following embodiments, the PSFCH time unit can also be understood as a PSFCH resource. Specifically, it is the time domain resource used to send sidelink feedback information.

This application provides a PSFCH resource configuration method in an SL-U scenario, which is used to configure sidelink feedback resources. In this way, PSFCH resources are configured for COT to improve the accuracy of sidelink information transmission in SL-U scenarios.

401. The first terminal device determines the first COT through channel access.

The first terminal device determines the first COT through LBT. The channel corresponding to the first COT may be called the first channel. The first COT can be understood as a period of sending opportunity, and the length of time during which information can be continuously sent corresponding to the sending opportunity can be called the channel occupancy time COT.

For the specific LBT process, please refer to the above content.

402. The first terminal device obtains the first configuration information.

The first configuration information is used to indicate the PSFCH cycle configuration in the sidelink resource pool.

The first configuration information is received information from the base station, or the first configuration information is predefined information. For example, the first terminal device can obtain the PSFCH configuration through RRC signaling, that is, the first configuration information is carried in the RRC signaling. For example, the first configuration information may include "sl-PSFCH-Period" signaling, and the PSFCH period configuration in the resource pool may be determined according to "sl-PSFCH-Period", for example, determined through the first configuration information

Optionally, the first COT is located in the side resource pool.

403. The first terminal device can determine the first PSFCH time unit set located in the first COT according to the first configuration information. Or, the first terminal device determines a first PSFCH time unit set according to the first configuration information, and the time units in the first PSFCH time unit set are a set of PSFCH time units located in the first COT.

The PSFCH time unit can be understood as a time unit that can be used to feed back sideline feedback information. The specific time length can be a time slot, mini-slot, several symbols, etc. For example, one PSFCH time unit is one slot, or one PSFCH time unit is one mini-slot, or 2 symbols.

404. The first terminal device sends first sidelink indication information, and the first sidelink indication information instructs the second terminal device to send sidelink feedback information in the second PSFCH time unit set.

The first sideline indication information has the following implementation forms: the first sideline indication information indicates the second PSFCH time unit set. Alternatively, the first indication information indicates an available or activated time unit in the first PSFCH time unit set. Alternatively, the first sideline indication information indicates the activation status of each time unit in the first PSFCH time unit set, where the PSFCH time units in the activation status constitute the second PSFCH time unit set.

The time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set. That is, the second PSFCH time unit set is a set of activated PSFCH time units in the first COT. The activated PSFCH time unit can also be understood as an available time unit, that is, a time unit that can be used by the second terminal device to send sideline feedback information.

The second PSFCH time unit set belongs to the first PSFCH time unit set. The PSFCH time units in the second PSFCH time unit set are those time units in the first PSFCH time unit set that are located within the first COT and are available/activated. It can be understood that the first PSFCH time unit set is the candidate time unit in the resource pool configured in the first COT, and it is uncertain whether the sidelink feedback information is actually sent on the PSFCH time unit.

The first side row indication information is used to indicate the activation status of each time unit in the first PSFCH time unit set. Alternatively, the first sideline indication information indicates whether the PSFCH time is available in the time unit set.

Sidelink feedback information is carried on the PSFCH, and sending sidelink feedback information may also be called sending PSFCH.

The second PSFCH time unit set includes activated PSFCH time units in the first COT and is used to feed back the transmission status of line information inside the first COT. The transmission situation includes one of the following: correct sideline information transmission/decoding, sideline information transmission/decoding error.

Correspondingly, the second terminal device determines according to the first sidelink indication information that the sidelink feedback information can be sent on the second PSFCH time unit set.

Wherein, the second PSFCH time unit set is the activation state of the PSFCH time unit in the first PSFCH time unit in the first COT. The second PSFCH time unit set belongs to the first PSFCH time unit set, and the first PSFCH time unit set is a PSFCH time unit set in the sidelink resource pool.

Optionally, the second terminal device determines the first set of PSFCH time units in the sidelink resource pool according to the first configuration information. Specifically, the second terminal device receives the first configuration information from the base station side or the first configuration information is predefined.

The second terminal device is the receiving end of the sidelink information sent by the first terminal device. That is, the second terminal device receives the sidelink information from the first terminal device on the PSSCH time unit in the first COT. The transmission status of the sidelink information is fed back to the first terminal device on the PSFCH time unit in the first COT. Or the second terminal device is not the receiving end of the first terminal device, and the second terminal device is at the first COT Receive sidelink information on the sidelink resources within.

Optionally, the sending time of the first sideline indication information is located in the first several time slots in the first COT, for example, the first sideline indication information is sent in the first time slot in the first COT. In this case, other terminal devices can determine the position of the PSFCH time unit as early as possible to avoid affecting the transmission of sidelink information or the transmission of sidelink feedback information.

The first side row indication information is carried in SCI or MAC CE. When the first side row indication information is carried in the SCI, the SCI may be a first-level SCI or the SCI may be a second-level SCI.

Other terminal devices surrounding the first terminal device can receive the first sideline indication information to clarify the availability or activation status of the PSFCH time unit in the PSFCH time unit set in the first COT. For example, the first terminal device is UE1, the first COT is COT1, and the second terminal device is UE2. UE1 seizes COT1 and sends the first sideline information through SCI in the first time slot in COT1 to indicate the first The activation status of the PSFCH time unit within the COT. Optionally, the second terminal device determines the first PSFCH time unit set in the first COT according to the first configuration information. Then the activation status of the time unit in the first PSFCH time unit set is determined according to the first sideline indication information from the first terminal device.

Optionally, the method may also include: 405. The first terminal device receives sideline feedback information from the second terminal device on a first PSFCH time unit, where the first PSFCH time unit is a PSFCH in the first PSFCH time unit set. time unit, and the first PSFCH time unit is a time unit in the second PSFCH time unit set indicated by the first sideline indication information, or is an available PSFCH time unit. The first PSFCH time unit corresponds to a resource for the second terminal device to receive sidelink information. For example, the second terminal device receives the first sidelink information from the first terminal device on the first sidelink resource, and the first sidelink resource corresponds to the first PSFCH time unit.

The second terminal device determines the second PSFCH time unit set according to the first sidelink indication information, and the first PSFCH time unit corresponding to the first sidelink transmission resource belongs to the second PSFCH time unit set. That is, the first PSFCH time unit is an available/activated time unit, and the second terminal device feeds back sideline feedback information on the first PSFCH time unit. The corresponding relationship between the first PSFCH time unit and the first sidelink transmission resource may be predefined or determined by other configuration information.

The above step 405 is when the second terminal device and the first terminal device form a communication pair, that is, the second terminal device receives the sidelink information from the first terminal device on the sidelink resource in the first COT. When the second terminal device is in other situations, step 405 may have the following other situations.

The second terminal device sends sidelink information to the first terminal device on the first COT. In this case, the first terminal device shares the sidelink resources in the first COT with the second terminal device. In this case, , in step 404, the first terminal device does not receive the sidelink feedback information on the PSFCH time unit, but the first terminal device sends the sidelink feedback information to the second terminal device on the PSFCH time unit that is activated or available in the first COT. .

The second terminal device receives the sidelink information from the third terminal device on the sidelink resource within the first COT. In this case, step 405 is: the third terminal device receives sideline feedback information from the second terminal device on the activated/available PSFCH time unit within the first COT.

The first side row indication information indicates the activated time units in the first PSFCH time unit set. The remaining time units are unavailable or inactive time units. The unavailable/inactivated time units can only be UE1's own PSSCH resources. The corresponding PSFCH time unit, that is, the deactivated PSFCH time unit, is the PSFCH time unit corresponding to the resource for UE1 to receive sideline data. Or the deactivated PSFCH time unit is a PSFCH time unit that UE1 determines does not require feedback from other users. That is, when deactivating the PSFCH time unit on a certain time slot, the first terminal device can only cancel the PSFCH time unit corresponding to its own PSSCH or determine that other users do not have PSFCH transmission resources, and for the time-frequency resources shared with other users , when the COT initiator cannot determine whether there is a need for PSFCH transmission resources, it cannot deactivate the PSFCH transmission resources.

For the PSFCH time unit deactivated in the COT, if the COT has only one UE initialization, or although it is initialized by multiple UEs (for example, in the case of interlace multiplexing), but the PSFCH time unit has been coordinated in advance, the UE can The deactivated PSFCH time unit is used for PSSCH transmission, which can not only improve resource utilization, but also avoid the risk of COT loss.

For example, in the first PSFCH time unit set, the PSFCH time units in the active state indicated by the first sideline indication information constitute the second PSFCH time unit set. It can be understood that, in addition to the second PSFCH time unit set in the first PSFCH time unit set, a set composed of the remaining unavailable/inactivated PSFCH time units may be called a third PSFCH time unit set. UE1 can determine part of the time units in the third PSFCH time unit set as the time unit used for PSSCH transmission. For example, the PSFCH time unit corresponding to the sidelink transmission resource of UE1 can be used for PSSCH transmission, or UE1 determines a certain PSFCH time unit. If there is no sidelink feedback information transmission, the resource can be used as a PSSCH resource. For example, UE1 may send fourth sideline indication information to indicate that part of the PSFCH time units in the third PSFCH time unit set is used for PSSCH transmission.

In the unlicensed frequency band, one of the target scenarios for sidelinks is high-rate or large-bandwidth services, which may require a large amount of time-frequency resources, such as occupying multiple consecutive symbols. PSFCH format 0 has 1 bit feedback information and occupies 1PRB Due to the characteristics of the resource, this feedback method is not efficient for resource utilization, and for the configurable PSFCH time unit, a PSFCH transmission needs to be paired with an automatic gain control symbol (automatic gain control, AGC) and a gap symbol. Feedback The overhead is larger. One possible way to improve the performance is to use codebook-based HARQ feedback, which allows the receiving UE to feed back HARQ-ACKs of multiple transport blocks (TB) to the sending UE at one time.

In NR, there are 5 physical uplink control channel (PUCCH) formats. As shown in Table 3, PUCCH format 2 occupies 1ˉ2 orthogonal frequency division multiplexing (orthogonal frequency division multiplexing) in the time domain. OFDM) symbols, and can transmit multi-bit information, can be used as one of the reference formats for HARQ-ACK feedback in the form of codebook-based sidelink in the unlicensed frequency band.

Table 3: Physical uplink control channel format

If the sidelink defines a HARQ-ACK feedback codebook based on the codebook form in the unlicensed frequency band, recorded as PSFCH format 1, then the PSFCH format 1 can be configured through the network or pre-configured. For the configurable PSFCH time unit in the resource pool or the PSFCH time unit indicated by COT, the PSFCH time unit can be fed back using the existing PSFCH format 0, or the newly defined PSFCH format 1 can be used for feedback.

When multiple PSFCH feedback modes are supported, the first terminal device can also send second sideline indication information to the second terminal device to indicate the specific PSFCH format, that is, instruct the second terminal device to use the format to send feedback information, for example Is PSFCH format 0 or a new PSFCH format. The second sideline indication can be carried by SCI or MAC CE or RRC signaling. When carried by SCI, it can be level 1 SCI or level 2 SCI. The second side row indication information and the first side row indication information may be located in the same SCI, for example, in the same first-level SCI or the same second-level SCI. Alternatively, the second side row indication information and the first side row indication information are located in different SCIs.

When the new PSFCH format is configured or instructed to be used, it means that the corresponding PSFCH transmission resource will be fed back in accordance with the newly defined PSFCH format. In particular, when the new PSFCH format means HARQ-ACK feedback based on the codebook, Then it means that the receiving UE performs HARQ-ACK feedback in the form of the codebook on the corresponding PSFCH time unit.

The following provides several exemplary descriptions of the indication situation of the first side row indication information.

Way 1.

The first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the activation status of the M PSFCH time units, where M is a positive integer. Wherein, the time units in the activated/available state in the first PSFCH time unit set constitute the second PSFCH time unit set.

At this time, the first sideline indication information can be understood as activation signaling or deactivation signaling. A first set of PSFCH time units configured for activation/deactivation of the first configuration information.

For example, the first sideline indication information includes 1 bit, and the 1 bit is used to activate the first PSFCH time unit set configured in the first configuration information, or the 1 bit is used to deactivate the first PSFCH time unit set configured in the first configuration information.

The system-level PSFCH periodic configuration information is obtained through the first configuration information, but for whether the PSFCH time unit in the COT is effective and used, this configuration needs to be activated through activation signaling (first sideline indication information). As shown in the example of (a) of Figure 5, the configuration of PSFCH cycle = 2 is periodically configured in the system, that is, the first configuration information configures the PSFCH cycle in the first COT to be 2. For the PSFCH time unit in the COT, the first terminal device Enable PSFCH feedback to take effect by sending the first sidelink indication information to enable the PSFCH feedback. If UE1 successfully seizes COT#1, it can activate the (pre)configuration with a PSFCH cycle of 2 through signaling at the beginning of COT. However, when COT#2 is initialized, no activation signaling is sent, which means that the configuration in the COT The PSFCH time unit is not effective and can be used to transmit other data or information, such as PSSCH. For signaling whether the existing PSFCH configuration resources are valid, only 1 bit of indication information is needed.

Or, for the PSFCH periodic configuration information indicated by the first configuration information, by default the configuration takes effect on all COTs in the resource pool. If the PSFCH time unit needs to be deactivated, deactivation signaling needs to be sent to cancel the configuration. As shown in (b) of Figure 5, the PSFCH cycle configured in the resource pool is 2. In COT#1, since the COT initial timeslot does not send deactivation signaling, the PSFCH feedback cycle in the COT is still configured as 2. In COT#2, since deactivation signaling is sent in the initial time slot of the COT, the PSFCH time units in the COT are invalid. These invalid PSFCH time units can be used to transmit other data or information, such as PSSCH.

In particular, one way is that the bit activation indication in the first sidelink indication information only takes effect in the time slot in which the first subsequent PSFCH time unit is located. As shown in (a) of Figure 6, within the system The configuration of PSFCH cycle=2 is periodically configured. For the (pre)configured PSFCH time unit, it is necessary to enable the corresponding PSFCH time unit to take effect through the activation command. Since both PSFCH #1 and PSFCH #3 are received before the time slot, When the activation command arrives, the PSFCH time units at both positions are effective. For this activation method, the time slot difference between the PSFCH time unit and the activation command should be considered to ensure that users who want to give feedback here can successfully decode. This activation command.

In particular, there is a way that the bit activation indication of the first sidelink indication information is only effective in the time slot in which the first subsequent PSFCH time unit is located. As shown in (b) of Figure 6, the intra-system period The configuration of PSFCH cycle = 2 is configured permanently. For the (pre)configured PSFCH time unit, a deactivation command is required. Since the deactivation command is received before the time slot where PSFCH#1 and PSFCH#3 are located, these two The PSFCH time units at all positions are invalid. For this activation method, the time slot difference between the PSFCH time unit and the activation command should be considered to ensure that users who originally want to give feedback here can successfully decode the activation command.

At this time, the sending time of the first sidelink indication information is not limited to the first few time slots in the first COT. For example, in (a) of Figure 6, the first sideline indication information sent in the fifth time slot indicates that the sixth time slot is an activated PSFCH time unit, or that certain symbols in the sixth time slot are activated. PSFCH time unit.

Way 2.

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship:

L＝(M _COT *2 ^u )/N _PSFCH

Among them, u is related to the subcarrier spacing configuration, N _PSFCH represents the PSFCH time unit period, M _COT represents the longest occupancy time of the first COT, and N _PSFCH is configured by the first configuration information.

For the PSFCH periodic configuration information obtained by RRC signaling sl-PSFCH-Period in the system, by default the configuration is unified for all COTs in the resource pool, that is, system-level configuration at the per resource pool level, and (de)activation signaling needs to be sent. Turn on (cancel) part of the PSFCH time unit. There are two methods below. Suppose the PSFCH cycle in the resource pool is The subcarrier configuration in the resource pool is represented by u. For example, u=0 means SCS=15KHz. Please refer to Table 2 for details. The maximum COT length that a terminal can occupy in the unlicensed frequency band is expressed as _MCOT . Taking NRU downlink as an example, when the channel access priority level CAPC=1, the maximum COT length T _{mcot at this time, p} is 2ms, that is, CAPC is 1 The COT time occupied by the terminal cannot exceed 2ms. For details, see Table 1.

Table 2

Bitmap indication: The specific bit value in the bitmap is used to indicate whether the system-level PSFCH time unit in the COT is effective. For example, "1" indicates that the PSFCH time unit configured in the time slot is effective, and "0" indicates that the time slot configuration is effective. The PSFCH time unit fails, then the bitmap length is equal to L. The following shows the maximum number of bits required for the bitmap indication information. When the indication information is indicated by SCI, in order to ensure the uniformity of the SCI length in the resource pool, it is assumed that the length of the indication information should also be L. Right now

The meaning of this formula is: for SCS configuration u, the unit of M _COT is ms, and each ms contains M _COT *2 ^u time slots. Since the PSFCH time unit period configured in the system is Therefore, the number of time slots with PSFCH time units in this Mcot time slot is L.

Assume that a terminal occupies a COT for T _COT , T _COT <= M _COT , and the number of PSFCH time units configured in the COT is M, then the first M bits among the L bits are used to indicate the PSFCH time in the COT. Unit activation status, the remaining LM bits do not need to specifically indicate the activation status.

An example is given below, as shown in (c) of Figure 6: a certain resource pool PSFCH cycle N=2, SCS=30KHz, the maximum M _COT duration supported in the resource pool is 10ms, then L=(10*2) /2=10bits. If the PSFCH time unit in the COT occupied by a terminal in the resource pool M=4, then the first 4 bits are used to indicate the activation status of the PSFCH time unit in the resource pool. UE1 preempts 4.5ms through LBT, and the PSFCH time in the COT is The number of units is 4, that is, M=4. At this time, only the first 4 of the 10 bits are needed to indicate the activation status corresponding to the PSFCH time unit in the COT. 0 indicates that the PSFCH time unit is deactivated, and 1 indicates that the PSFCH time The unit is active. This bitmap indication can be sent in the first slot of the COT.

Way 3.

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes Q bits, and each P bit is used to indicate the activation status of the PSFCH time units of k consecutive time slots. P and Q satisfy the following relationship:
P＝ceil(log2(k))

Among them, u indicates the subcarrier spacing parameter, N _PSFCH indicates the PSFCH time unit period, M _COT indicates the longest occupancy time of the first COT, and N _PSFCH is configured by the first configuration information.

G bits among the Q bits are used to indicate the activation status of M PSFCH time units, and Where M' represents the actual duration of the first COT.

By grouping the time slots in which the PSFCH time units are located, the activation status of the PSFCH time units is indicated in groups, and k PSFCH time units are divided into one group.

Optionally, p can be 1, that is, 1 bit indicates the activation status of K PSFCH time units in the group. Since k PSFCH time units are in a group of time slots, there are a total of packets, so the required number of bits is Q=G. When the PSFCH cycle of a certain resource pool is N=2, SCS=30KHz, u=1, regulations stipulate that the maximum M _COT duration supported in the resource pool is 10ms, k=2, then G=5bits, as shown in Figure 7, UE1 passes LBT Preemption 4.5ms, the number of PSFCH time units in the COT is 4, that is, M=4, k=2, then the number of groups is 2. At this time, only the first 2 of the 5 bits are needed to indicate the PSFCH time unit in the COT. Corresponding activation status, 0 indicates that the PSFCH time unit in group 1 is deactivated, and 1 indicates that the PSFCH time unit in group 2 is in an activated state. This bitmap indication can be sent in the first slot of the COT.

Optional, P bit indicates the activation status of K consecutive PSFCH time units in the group: then each group requires P = ceil (log2 (k)) bits, then there are at most packets, then the length of the indication information is Among them, ceil() means rounding up. Or in a possible way, for the last group, the required number of bits P1 <= P, that is, the number of remaining PSFCH time units in the last group is Then the number of bits required in the last group is P1=ceil(log2(M1)). At this time, G=P*(G-1)+P1. The following example: when the PSFCH cycle of a certain resource pool is N=2, SCS=30KHz, u=1, regulations stipulate that the maximum M _COT duration supported in the resource pool is 10ms, k=2, then G=5bits, UE1 preempts 4.5ms through LBT , the number of PSFCH time units in the COT is 4, that is, M=4, k=2. At this time, only the first 2 of the 5 bits are needed to indicate the activation status corresponding to the PSFCH time unit in the COT. If the indication indicates an activation indication, refer to (a) of Figure 8. Since the first two bits are 1, then It indicates that the PSFCH time unit at the second position of the packet is in the activated state, that is, PSFCH#2 and PSFCH#4 are available PSFCH time units; if this indication indicates a deactivation indication, refer to (b) of Figure 8. Since the first two bit is 0, it means that the PSFCH time unit at the second position of the group is in the deactivated state, that is, PSFCH#2 and PSFCH#4 are unavailable PSFCH time units, while other PSFCH time units in the group are available. , that is, PSFCH#1 and PSFCH#3 can be used for PSFCH feedback transmission.

This application also provides a method 800 for sending sidelink feedback information in an SL-U scenario. In this way, the loss of the COT that may be caused by the lack of feedback of the PSFCH configured in the COT is avoided, and the reliability of sidelink communication is improved.

801. The first terminal device determines the first sidelink feedback resource corresponding to the first sidelink resource.

The first sidelink resource is located in the first COT of the first channel. The first COT is determined by the first terminal device, or the first COT is determined by the second terminal device, and the first sidelink resource is shared by the second terminal device with the first terminal device.

The first sidelink resource is located in the first COT of the first channel, and the first sidelink resource is used to send sidelink information. The first sidelink resource may also be called PSSCH resource. The first side row resource and the first side row feedback resource have a corresponding relationship, and the corresponding relationship may be predefined or configured. The first sidelink feedback resource is used to feed back the reception status of the sidelink information transmitted on the first sidelink resource. For example, if the sidelink information is received correctly, ACK is fed back; if the sidelink information is received incorrectly, NACK is fed back.

The first terminal device is the initiator of the first COT, that is, the first COT is determined by the first terminal device through LBT. In this case, the first sidelink resource is located in the COT preempted by the first terminal device. The initiator of the first COT can also be another terminal device. For example, the second terminal device seizes the first channel and obtains the first COT, and the second terminal device shares the first sidelink resources in the first COT with the first terminal device. , the first terminal device sends the sidelink information on the first sidelink resource, or receives the sidelink information. That is, the first terminal device is a COT initial UE or a TX UE or RX UE of sidelink resources.

Before step 801, the first terminal device may first receive first configuration information. The first configuration information is used to configure the PSFCH time unit, including the period of the PSFCH and the position relationship of the PSFCH time unit in the resource pool, represented by sl-PSFCH-RB. -Set" and/or "sl-RB-SetPSFCH, indicating the bitmap indicates when the cycle configuration parameters When not equal to 0, the PSFCH time unit in the resource pool appears periodically. The first configuration information may be carried in RRC higher layer signaling.

The first terminal device determines the first sidelink feedback resource corresponding to the first sidelink resource according to the first configuration information.

Step 802. If the first condition is met, the first terminal device sends the second information on the first sideline feedback resource.

The second information sent by the first terminal device is used to occupy the first sideline feedback resource. The second information may be HARQ-ACK feedback information, or the second information may be padding bits, or the second information may be sideline data. It can be understood that the first terminal device can avoid the loss of the first COT by sending the second information on the first sideline feedback resource.

Case 1. The first condition is that the first sidelink resource is used by the first terminal device to send the first sidelink information through blind retransmission.

When the sidelink information transmitted on the first sidelink resource is sent through blind retransmission, no feedback information will be sent on the sidelink feedback resource corresponding to the sidelink resource, that is, the first sidelink resource.

The first terminal device sends the first sideline information, or the first terminal device receives the first sideline information. The first sideline information includes the HARQ feedback enabled/disabled indicator in SCI format 2-A/B/C. The indicator is set to the disabled state, which means that the first sideline information is sent through blind retransmission. . The SCI is broadcast information, and all UEs within a certain geographical range can receive the SCI. As shown in Figure 9, the PSFCH cycle configured at the system level in the resource pool is 2, that is, a PSFCH reflection occurs every 2 time slots. At the same time, the processing delay is configured as 2 time slots, so the feedback information of the PSSCH in slot 0 and slot 1 is sent in slot 3. When slot0 and slot1 are blind retransmissions, and the PSFCH cycle in the resource pool is 2, there is no terminal feedback in the PSFCH time units of slot1 and slot3. At this time, if the gap>25us, there will be a risk of COT loss.

Case 2. The first condition is that the time interval between the first sidelink resource and the first sidelink feedback resource is less than the first threshold.

In this case, the first terminal device occupies the first sideline feedback resource by sending the second information. PSSCH-PSFCH processing delay is insufficient. The first threshold is standard predefined or configured. Optionally, the first terminal device is the first COT.

Considering the limitation of the receiving user's decoding capability, the receiving user cannot provide feedback immediately after receiving the PSSCH. Therefore, the standard defines a PSSCH feedback time interval K, that is, the PSSCH is transmitted on the first available time slot containing the PSFCH time unit. PSFCH, this time slot is at least K time slots away from the time slot where PSSCH is located, and the value of K is configured by the resource pool. As shown in (e) of Figure 3, when K=2, the PSSCH carried on slots 0 and 1 can be fed back on the PSFCH time unit on slot 3. As shown in Figure 9, when the minimum processing delay set in the resource pool is 2 time slots, the PSSCH resources corresponding to Slot0 and slot1 can only be fed back in slot3, so there is no terminal feedback for the PSFCH time unit in slot1. At this time Gap>25us brings the risk of COT loss.

Case 3. The first condition is that the first sidelink resource is used by the first terminal device to transmit the broadcast service.

The first sidelink resource is used by the first terminal device to send or receive broadcast services. That is, the first terminal device is the sender or receiver of the broadcast service.

For broadcast services, HARQ feedback is not required, so there may be no user feedback in the corresponding PSFCH time unit. Therefore, when the sender/receiver of sidelink information determines that the sidelink information is a broadcast service, it can determine to occupy the corresponding PSFCH time unit to avoid the risk of possible loss of COT due to no feedback on this resource.

Case 4. The first condition is that the first sidelink resource is used to transmit multicast type 1 services. When the user does not successfully decode the SCI or the user decodes the ACK, no terminal needs to provide feedback at the PSFCH time unit and there is a COT. Risk of loss.

The first terminal device is the sending end or receiving end of the multicast type 1 service.

Case 5. The first condition is that the first sidelink resource and the first sidelink feedback resource are located on the first channel, and the energy detected by the first terminal device within the first time period before the time domain position of the first sidelink resource is lower than The second threshold value or the side control information SCI is not detected. The length of the first duration is Assume that the first PSFCH time unit in the COT appears in the numbered time slot N in the resource pool. If the COT initiator detects The time slot energy is lower than the threshold, or SCI is not detected, where K is the PSSCH feedback time interval defined by the standard. If the detected energy is lower than the second threshold, it means that no terminal has occupied the channel before, that is, no user needs to feedback according to the PSFCH time unit pool where the mapping relationship is located; if the energy is higher than the threshold but no SCI is detected, it means that there may be an abnormality. System terminal occupation needs to be fed back according to the PSFCH time unit pool where the mapping relationship is located.

In step 802, the first terminal device sends the second information on the first sidelink feedback resource, and the first sidelink feedback resource may include one sidelink feedback resource or multiple sidelink feedback resources.

That is, the first side-link resource corresponds to one side-link feedback resource or to multiple side-link feedback resources.

If there is only one candidate resource corresponding to the first sidelink resource, then the first terminal device only needs to send the second information on the first sidelink resource. For example, LBT can be performed at the PSFCH where the candidate resource is located, and after the LBT passes, the second information can be sent.

If there is more than one first side row feedback resource corresponding to the first side row resource. The first sidelink feedback resource includes the second sidelink feedback resource and the third sidelink feedback resource. The second sidelink feedback resource and the first sidelink resource are located on the same channel. The third sidelink feedback resource is the same as the first sidelink resource. On different channels, the first terminal device sends the second information on the first sideline feedback resource, including: the first terminal device sends the second information on the second sideline feedback resource. That is, the first terminal device preferentially selects and occupies the PSFCH resource in the first COT, that is, the first terminal device preferentially occupies the sidelink feedback resource located in the same RB set as the sidelink feedback resource or the sidelink transmission resource.

When 1 PSSCH resource corresponds to a certain time slot, there are candidate resources on Q (Q>=1) RB sets, as shown in Figure 10, for example. In a certain time slot, if the occupied terminal passes the LBT on Q' (Q'<=Q) time slots, the terminal is in the preempted COT and/or the shared COT, and the PSFCH in one or more RB sets Resources are sent. The PSFCH resource can be common PSFCH and/or the 1PRB resource corresponding to PSFCH format 0, or it can be the interlace/RB resource and/or the 1PRB resource corresponding to PSFCH format 0. The common PSFCH resource is not related to the PSSCH-PSFCH mapping of a certain UE. . Priority is given to feeding back the PSFCH on the COT preempted by the occupying terminal or on the RB set where the COT where the PSSCH is located is located, or one can be randomly selected for transmission. As shown in Figure 10, if the COT resource (pink) that 1 seizes on Channel #1 and the COT (channel #2) where UE1 sends PSSCH are not on the same channel, if UE1 passes the LBT on both, it can The corresponding positions on the channel (PSFCH resources numbered 0 and 1) are fed back, or feedback can be fed back on one of them.

The first sidelink feedback resource is a common sidelink feedback resource, and the first terminal device can send the second information on the Common PSFCH resource. In this case, the common sidelink feedback resource has no binding corresponding relationship with the first sidelink resource, and the common sidelink feedback resource can be used by multiple UEs to send feedback information. This common side row feedback resource is used to meet communication requirements.

Optionally, the second terminal device determines the first sidelink feedback resource corresponding to the first sidelink resource, and the first sidelink feedback information is used by the second terminal device to receive the first sidelink information; when the first sidelink information is satisfied; If conditions exist, the first terminal device sends third information on the first sideline feedback resource, where the third information is used to occupy the first sideline feedback resource. At this time, the second terminal device receives the sidelink information on the first sidelink resource in the first COT. In order to prevent the COT from being lost, the second terminal device sends a signal on the first sidelink feedback resource to occupy the resource to avoid COT is lost due to no signal for a certain period of time.

As shown in Figure 11, in the unlicensed frequency band, two terminals have successively seized their respective COTs. COT#1 can be preempted by other SL users or users of different systems. At the same time, periodic PSFCH resources are configured in the resource pool, with a cycle of 2 and a processing delay of 2 time slots, that is, the PSFCH resources are decoupled from the COT. When irrelevant UEs outside COT#2 (i.e., UEs in COT#1) are allowed to feedback within this COT, since the users in COT#2 are not sure about the user feedback behavior of COT#1, that is, they are not sure about the PSFCH corresponding to PSSCH#0. Whether there are users of the resource who will provide feedback here, in order not to interfere with the normal feedback of other users and at the same time ensure that this COT is not lost, so the occupying terminal can send data in the common PSFCH resource. For regions with OCB regulatory requirements, one possible way is that the UE still uses 1PRB resources for HARQ-ACK feedback in the manner defined in R16, and at the same time needs to transmit PSFCH resources on the common interlace, and there is no corresponding PSSCH- PSFCH mapping relationship, the common interlace resource can be a whole in the entire resource pool, or it can be a set of RBs in a certain RB set of the resource pool. For scenarios that support multi-user reuse, multiple users access the same time slot at the same time, but use different interlace resources. As shown in Figure 12, frequency domain resources adopt an interlace structure. For the case where the subcarrier spacing is 15KHz (30KHz), every 10 (5) PRBs in the resource pool can form a group of independent interlace resources, or every 10 (5) PRBs in the resource pool can form a set of independent interlace resources. Every 10 (5) PRBs in the RB set form a set of independent Interlace resources. UE1, 2, and 3 respectively occupy 2 and 1/3 interlaces to transmit PSSCH data. At the corresponding PSFCH resource feedback point, UE1/2/3 except The PRB resources occupied by the 1PRB resource feedback mapping relationship of R16 are used for signal transmission, and signals need to be sent in the common interlace.

However, for scenarios where the PSSCH-PSFCH processing delay is insufficient, if common PSFCH resources are not introduced, the COT initiator can cancel the PSFCH transmission resources at the corresponding location and use them to transmit other data or information, such as PSSCH. Or the occupying terminal can send an occupation signal on the corresponding PSFCH resource according to the corresponding mapping relationship. As shown in Figure 13, for the first PSFCH resource in the COT, due to the processing delay, no user provides feedback on this resource at this time. To ensure that it is not lost, the occupying terminal can map the frequency domain location of the PSFCH corresponding to the PSSCH. Send data or signals on. As shown in Figure 13, the arrow indicates the green box. According to the mapping relationship of PSFCH format 0, the PSSCH resource on each subchannel has a corresponding PSFCH position. It only needs to be sent according to the established mapping relationship, that is, the first two of the original COT This time slot should be fed back in the second PSFCH, but due to the processing delay, there is no information feedback. Then the data/signal can be sent forward by moving the mapping feedback according to the position of subsequent resource feedback.

In addition to the above data transmission methods, this application also provides a relevant introduction to the sidelink 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. By way of example, 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, This application does not specifically limit this.

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.

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 and determining 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.

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 above method 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 Figure 4, 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. 4, and/or FIG. 8. 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. 15 shows only the main components of the terminal device 1500. As shown in FIG. 15 , 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 and transmits the radio frequency signal to the terminal device 1500. The signal is converted into a baseband signal and the baseband signal is output 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 15 integrates the functions of a baseband processor and a central processor. Those skilled in the art can understand that the baseband processor and the central processor can also be independent processors and are 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 15, 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.

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

A communication method, characterized by including:

The first terminal device determines the first channel occupancy time COT through channel access;

The first terminal device obtains first configuration information, where the first configuration information is used to indicate the PSFCH cycle configuration of the sidelink resource pool;

The first terminal device determines the first PSFCH time unit set in the first COT according to the first configuration information;

The first terminal device sends first sidelink indication information, and the first sidelink indication information instructs the second terminal device to send sideline feedback information in a second PSFCH time unit set; the second PSFCH time unit set belongs to The first PSFCH time unit set.
The method according to claim 1, characterized in that:

The time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set.
The method according to claim 1 or 2, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the activation status of the M PSFCH time units, where M is a positive integer.
The method according to claim 1 or 2, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship:
L＝(M COT *2 u )/N PSFCH

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
The method according to claim 1 or 2, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes Q bits, and each P bit is used to indicate the activation status of the PSFCH time units of k consecutive time slots. P and Q satisfy the following relationship:
P＝ceil(log2(k))

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
A communication method, characterized by including:

The second terminal device obtains the first configuration information;

The second terminal device determines the first PSFCH time unit set in the first COT according to the first configuration information;

The second terminal device receives first sideline indication information from the first terminal device, the first sideline indication information indicates sending sideline feedback information in a second PSFCH time unit set, and the second PSFCH time unit The set belongs to the first PSFCH time unit set.
The method according to claim 6, characterized in that:

The time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set.
The method according to claim 6 or 7, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the activation status of the M PSFCH time units, where M is a positive integer.
The method according to claim 6 or 7, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship:
L＝(M COT *2 u )/N PSFCH

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
The method according to claim 6 or 7, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes Q bits, and each P bit is used to indicate the activation status of the PSFCH time units of k consecutive time slots. P and Q satisfy the following relationship:
P＝ceil(log2(k))

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
A communication method, characterized by including:

The first terminal device determines the first sidelink feedback resource corresponding to the first sidelink resource;

When the first condition is met, the first terminal device sends second information on the first sidelink feedback resource, and the second information is used to occupy the first sidelink feedback resource.
The method according to claim 11, characterized in that:

The first condition includes one of the following:

The first sidelink resource is used by the first terminal device to send the first sidelink information through blind retransmission;

The time interval between the first sidelink resource and the first sidelink feedback resource is less than a first threshold;

The first sidelink resource is used for the first terminal device to transmit broadcast services;

The first sidelink resource and the first sidelink feedback resource are located on the first channel, and the energy detected by the first terminal device within a first time period before the time domain position of the first sidelink resource is low. below the second threshold; or

The first terminal device does not detect the sidelink control information SCI within the first time period before the time domain position of the first sidelink resource.
The method according to claim 11 or 12, characterized in that,

The first sidelink resource is located in the first COT of the first channel;

The first COT is determined by the first terminal device, or

The first COT is shared by the second terminal device to the first terminal device.
The method according to any one of claims 11-13, characterized in that,

The first side-link feedback resources include public side-link feedback resources.
The method according to any one of claims 11-14, characterized in that,

The first side-link feedback resource includes a second side-link feedback resource and a third side-link feedback resource. The second side-link feedback resource is located on the same channel as the first side-link resource. The third side-link feedback resource is located on the same channel. The feedback resources and the first sidelink resources are located on different channels,

The first terminal device sends second information on the first sideline feedback resource, including:

The first terminal device sends second information on the second sideline feedback resource.
A communication method, characterized by including:

The second terminal device determines the first sidelink feedback resource corresponding to the first sidelink resource, and the first sidelink feedback information is used by the second terminal device to receive the first sidelink information;

When the first condition is met, the first terminal device sends third information on the first sideline feedback resource, where the third information is used to occupy the first sideline feedback resource.
The method according to claim 16, characterized in that:

The first condition includes one of the following:

The first sideline information is sent through blind retransmission;

The first sidelink information belongs to the broadcast service.
The method according to claim 16 or 17, characterized in that,

The first sidelink resource is located in the first COT of the first channel, and the first sidelink resource is shared by other terminal devices to the second terminal device.
The method according to any one of claims 16-18, characterized in that,

The first side-link feedback resources include public side-link feedback resources.
A communication device, characterized by including a processing unit and a transceiver unit, wherein,

The processing unit is used to determine the first channel occupancy time COT through channel access;

The transceiver unit is configured to obtain first configuration information, where the first configuration information is used to indicate the PSFCH cycle configuration of the sidelink resource pool;

The processing unit is also configured to determine the first PSFCH time unit set in the first COT according to the first configuration information;

The transceiver unit is also configured to send first sideline indication information, the first sideline indication information instructs the second terminal device to send sideline feedback information in the second PSFCH time unit set; the second PSFCH time unit The set belongs to the first PSFCH time unit set.
The device according to claim 20, characterized in that:

The time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set.
The device according to claim 20, characterized in that:

PSFCH time units in the first PSFCH time unit set except the second PSFCH time unit set are used for PSSCH transmission.
The device according to claim 20 or 21, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the activation status of the M PSFCH time units, where M is a positive integer.
The device according to claim 20 or 21, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship:
L＝(M COT *2 u )/N PSFCH

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
The device according to claim 20 or 21, characterized in that,

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes Q bits, and each P bit is used to indicate the activation status of the PSFCH time units of k consecutive time slots. P and Q satisfy the following relationship:
P＝ceil(log2(k))

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
A communication device, characterized by comprising a processing unit and a transceiver unit, wherein,

The transceiver unit is used to obtain the first configuration information;

The processing unit is configured to determine the first PSFCH time unit set in the first COT according to the first configuration information;

The transceiver unit is also configured to receive first sideline indication information from the first terminal device. The first sideline indication information indicates that sideline feedback information is sent in the second PSFCH time unit set. The second PSFCH The time unit set belongs to the first PSFCH time unit set.
The device according to claim 26, characterized in that:

The time units included in the second PSFCH time unit set are time units in the activated state in the first PSFCH time unit set.
The device according to claim 26 or 27, characterized in that:

The first PSFCH time unit set includes M PSFCH time units, and the first sideline indication information is used to indicate the activation status of the M PSFCH time units, where M is a positive integer.
The device according to claim 26 or 27, characterized in that:

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes L bits, and L satisfies the following relationship:
L＝(M COT *2 u )/N PSFCH

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
The device according to claim 26 or 27, characterized in that:

The first PSFCH time unit set includes M PSFCH time units, the first sideline indication information includes Q bits, and each P bit is used to indicate the activation status of the PSFCH time units of k consecutive time slots. P and Q satisfy the following relationship:
P＝ceil(log2(k))

Among them, u indicates the subcarrier spacing parameter, N PSFCH indicates the PSFCH time unit period, M COT indicates the longest occupancy time of the first COT, and N PSFCH is configured by the first configuration information.
A communication device including a processing unit and a transceiver unit, wherein,

The processing unit is used to determine the first side row feedback resource corresponding to the first side row resource;

When the first condition is met, the transceiver unit is configured to send second information on the first sidelink feedback resource, and the second information is used to occupy the first sidelink feedback resource.
The device according to claim 31, characterized in that:

The first condition includes one of the following:

The first sidelink resource is used by the first terminal device to send the first sidelink information through blind retransmission;

The time interval between the first sidelink resource and the first sidelink feedback resource is less than a first threshold;

The first sidelink resource is used for the first terminal device to transmit broadcast services;

The first sidelink resource and the first sidelink feedback resource are located on the first channel, and the energy detected by the first terminal device within a first time period before the time domain position of the first sidelink resource is low. below the second threshold; or

The first terminal device does not detect the sidelink control information SCI within the first time period before the time domain position of the first sidelink resource.
The device according to claim 31 or 32, characterized in that:

The first sidelink resource is located in the first COT of the first channel;

The first COT is determined by the first terminal device, or

The first COT is shared by the second terminal device to the first terminal device.
The device according to any one of claims 31-33, characterized in that:

The first side-link feedback resources include public side-link feedback resources.
The device according to any one of claims 31-34, characterized in that:

The first side-link feedback resource includes a second side-link feedback resource and a third side-link feedback resource. The second side-link feedback resource and the first side-link resource are located on the same channel. The third side-link feedback resource is located on the same channel. The feedback resources and the first sidelink resources are located on different channels,

The first terminal device sends second information on the first sideline feedback resource, including:

The first terminal device sends second information on the second sideline feedback resource.
A communication device including a processing unit and a transceiver unit, wherein,

The processing unit is configured to determine the first sidelink feedback resource corresponding to the first sidelink resource, and the first sidelink feedback information is used by the second terminal device to receive the first sidelink information;

When the first condition is met, the transceiver unit is configured to send third information on the first sideline feedback resource, and the third information is used to occupy the first sideline feedback resource.
The device according to claim 36, characterized in that:

The first condition includes one of the following:

The first sideline information is sent through blind retransmission;

The first sidelink information belongs to the broadcast service.
The device according to claim 36 or 37, characterized in that,

The first sidelink resource is located in the first COT of the first channel, and the first sidelink resource is shared by other terminal devices to the second terminal device.
The device according to any one of claims 36-38, characterized in that,

The first side-link feedback resources include public side-link feedback resources.
A communication device, characterized by including:

A processor, configured to execute a computer program stored in a memory, so that the device performs the method of any one of claims 1 to 5, or to cause the device to perform the method of any one of claims 6 to 9. The method described in the item, or to cause the device to perform the method as described in any one of claims 10 to 13, or to cause the device to perform the method as described in any one of claims 14 to 15.
The device of claim 40, further comprising the memory and/or communication interface, the communication interface being coupled to the processor,

The communication interface is used to input and/or output information.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium. When the computer program is run on a computer, it causes the computer to execute any one of claims 1 to 5. The method described in the item, or to cause the computer to perform the method as described in any one of claims 6 to 9, or to cause the computer to perform the method as described in any one of claims 10 to 13, Or to cause the computer to perform the method according to any one of claims 14 to 15.
A computer program product, characterized in that the computer program product includes a computer program for executing any one of claims 1 to 5. instructions for the method of any one of claims 6 to 9, or the computer program product includes instructions for performing the method of any one of claims 6 to 9, or the computer program product includes instructions for performing the method of any one of claims 6 to 9. Instructions for the method of any one of claims 10 to 13, or the computer program product includes instructions for performing the method of any one of claims 14 to 15.