A communication method and related device

Abstract

The present application discloses a communication method and related devices, which are applied to V2X, Internet of Vehicles, intelligent driving, assisted driving and other fields. The method includes: a first terminal device obtains a channel occupancy time COT, and after obtaining the COT, receives a sidelink control information SCI on a first resource, the SCI including indication information, the indication information is used to instruct the first terminal device to send a first signal, the first resource belongs to the COT, the SCI is used to schedule the sidelink data, and the sidelink data is carried on the second resource. The first terminal device determines the physical sidelink feedback channel PSFCH time slot based on the second resource, and sends a first signal on the PSFCH time slot. In the present application, the first terminal device sends a first signal on the corresponding PSFCH time slot based on the indication information, so as to ensure that the accessed channel is not in an idle state within the COT as much as possible, thereby ensuring that the COT is not lost, and improving the competitiveness and system performance of the sidelink communication system in the unlicensed frequency band.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and related devices. Background Art

[0002] In wireless communication systems, frequency bands can be divided into licensed bands and unlicensed bands according to their use. In licensed bands, users can use spectrum resources based on the scheduling of central nodes. In unlicensed bands, transmitting nodes need to use spectrum resources in a competitive manner. Specifically, they compete for channels through the listen-before-talk (LBT) mechanism. LBT is a channel access rule based on random back-off. Taking the transmitting node as the user equipment (UE) as an example, the UE can first sense whether the channel is idle. If the channel has been 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 recover to idle before it can occupy the channel. After the UE occupies the channel through LBT, it can send information on the channel for a period of time, which is called the channel occupancy time (COT).

[0003] After the UE executes the channel access process to obtain the COT (the UE is called the COT initiator), it can share the resources in the COT with other UEs, including the time domain position and the frequency domain position. After other UEs receive the information of the shared resources, they can send information to the COT initiator at the specified time using the specified frequency domain.

[0004] Direct communication between UE and UE is called sidelink communication. In the sidelink communication system, the time-frequency resources of the periodic physical sidelink feedback channel (PSFCH) are configured on the resource pool. The UE can feedback the data reception status through the PSFCH time-frequency resources. However, for some PSFCH time slots, the COT initiator is not clear whether the UE sharing the COT resources will send data in the time slot, and the UE sharing the COT resources is also unclear whether the COT initiator will send data in the time slot. As a result, it is easy to cause the channel to be idle in the COT. When the channel idle time exceeds the interval time specified by the LBT, the channel is allowed to be preempted, and there is a risk of COT loss. Summary of the invention

[0005] The present application provides a communication method and related devices, in which a transmitting device instructs a receiving device to send a signal in a corresponding PSFCH time slot through indication information, thereby alleviating COT loss caused by channel idleness and improving the competitiveness and system performance of the sideline communication system in an unlicensed frequency band.

[0006] The first aspect of the present application provides a communication method, which is applied to a first terminal device. The first terminal device may be a terminal device, or the first terminal device may be a partial component in the terminal device (such as a processor, a chip or a chip system, etc.), or the first terminal device may also be a logic module or software that can realize all or part of the functions of the terminal device. The method includes: obtaining the channel occupancy time COT; receiving sidelink control information (SCI) on a first resource, the SCI including indication information, the indication information is used to indicate the sending of a first signal, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource; determining the physical sidelink feedback channel PSFCH time slot based on the second resource; sending a first signal on the PSFCH time slot.

[0007] The first terminal device may be a COT initiator, accessing the channel and acquiring the COT by executing a channel access process, for example, accessing the channel through a type 1 LBT mechanism. After acquiring the COT, the first terminal device may share resource information in the COT with the second terminal device.

[0008] The first terminal device may also be a device that shares COT resources. After the second terminal device executes the type 1LBT mechanism to access the channel and obtains the COT, it shares the resource information in the COT with the first terminal device, and the resource information includes the time domain position and the frequency domain position. After receiving the shared resource information, the first terminal device also accesses the channel through the channel access process to obtain the COT.

[0009] The first resource belongs to the resources in the acquired COT. Specifically, the time domain resources in the first resource belong to the COT, and the frequency domain resources in the first resource belong to the frequency domain resources corresponding to the COT, that is, the frequency domain resources of the accessed channel. The first resource includes a physical sidelink control channel (PSCCH) resource and a physical sidelink shared channel (PSSCH) resource.

[0010] SCI includes first-order SCI and second-order SCI, where the first-order SCI is carried on PSCCH and the second-order SCI is carried on PSSCH. The first terminal device can decode the second-order SCI and PSSCH only after correctly decoding the first-order SCI. The first-order SCI is used to schedule the second-order SCI and the sideline data sent by the second terminal device to the first terminal device. The sideline data is carried in the second resource, which is the PSSCH resource in the first resource, specifically including the time domain resources and frequency domain resources of PSSCH.

[0011] The indication information may be carried in the first-order SCI or the second-order SCI. The indication information is used to instruct the first terminal device to send the first signal in the corresponding feedback time slot, thereby ensuring that the channel is not in an idle state.

[0012] In the first aspect of the present application, the first terminal device sends a first signal on the corresponding PSFCH time slot based on the indication information, so as to ensure that the accessed channel is not idle within the COT as much as possible, thereby ensuring that the COT is not lost, thereby improving the competitiveness of the side communication system in the unlicensed frequency band.

[0013] In a possible implementation manner of the first aspect, the first signal is used to occupy the COT.

[0014] In this possible implementation, the first signal is not a true feedback signal, but is only used to occupy the COT. The first signal may have no practical meaning and is not used to carry feedback information such as confirmation characters (acknowledgement, ACK), negative characters (negative acknowledgement, NACK) or conflict indication information. After the first terminal device sends the first signal, the opposite device may not receive the first signal. Exemplarily, the first signal is a PSFCH-like signal. In this possible implementation, the form of the first signal is limited, which improves the feasibility of the solution.

[0015] In a possible implementation manner of the first aspect, the method further includes: determining not to receive feedback information on the PSFCH time slot.

[0016] When a transmission / reception conflict occurs in the first terminal device on the PSFCH time slot, the first terminal device determines not to receive feedback information on the PSFCH time slot, that is, the first terminal device gives priority to sending the first signal. At this time, the first terminal device does not perform priority judgment, and will send the first signal on the corresponding PSFCH time slot after receiving the indication information, thereby avoiding the channel being in an idle state and ensuring that the COT is not lost.

[0017] In a possible implementation manner of the first aspect, the above-mentioned step of: sending the first signal on the PSFCH time slot includes: when there is no feedback information on the PSFCH time slot, sending the first signal on the PSFCH time slot.

[0018] When the first terminal device does not need to receive feedback information in the PSFCH time slot, the first terminal device chooses to send the first signal. In other words, when there is no transmission / reception conflict, the first terminal device sends the first signal. When there is a transmission / reception conflict, the first terminal device needs to make a subsequent judgment. In this possible implementation method, the specific scenario in which the first terminal device sends the first signal is limited, which improves the feasibility of the solution.

[0019] In a possible implementation manner of the first aspect, the method further includes: when there is feedback information on the PSFCH time slot, determining not to send the first signal on the PSFCH time slot.

[0020] When there is feedback information on the PSFCH time slot, the first terminal device preferentially chooses to receive the feedback information instead of sending the first signal, thereby ensuring the normal development of the service.

[0021] In a possible implementation of the first aspect, the method also includes: determining the priority of the first signal and the priority of feedback information, the feedback information is carried in the PSFCH time slot; the above-mentioned step: sending the first signal on the PSFCH time slot, including: when the priority of the first signal is higher than the priority of the feedback information, sending the first signal on the PSFCH time slot.

[0022] The communication system may define the priority of the first signal and the feedback information, and the first terminal device determines to send the first signal or receive the feedback information based on the priority information. When the priority of the first signal is higher than the feedback information, the first terminal device determines to send the first signal. Otherwise, the first terminal device chooses to receive the feedback information. Exemplarily, the priority information of the first signal may be carried in the first-order SCI, and the first-order SCI has a fixed field for indicating the priority. The first terminal device may obtain the priority information of the first signal after decoding the first-order SCI.

[0023] In this possible implementation, the first terminal device can determine whether to send the first signal based on the priority information, which expands the application scenario of the solution. In addition, different priorities can be set for the first signal in different service scenarios, thereby achieving more refined management.

[0024] In a possible implementation manner of the first aspect, the priority of the first signal is the same as the priority of the sidelink data.

[0025] The priority of the first signal is the same as the priority of the sidelink data carried in the second resource, and the priority of feedback information sent by other terminal devices to the first terminal device is the same as the priority of the sidelink data sent by the first terminal device to the terminal device.

[0026] In this possible implementation, the priority of the first signal corresponds to the priority of the sideline data, so there is no need to define the priority of the first signal separately, thus saving workload.

[0027] In a possible implementation manner of the first aspect, the priority of the first signal is network configured, preconfigured, or predefined.

[0028] The priority of the first signal is configured, preconfigured or predefined by the communication network. For example, for the priority of the first signal and the feedback information, a value can be (pre)set or predefined, for example, the priority of the first signal is set to 1, the priority of the feedback information is set to 2, and the smaller the priority value, the higher the priority, then the priority of the first signal is higher than the priority of the feedback information.

[0029] In a possible implementation manner of the first aspect, the number of PSFCH time slots is N, and the above-mentioned step: sending a first signal on the PSFCH time slot includes: sending N first signals on the PSFCH time slot, and the N first signals are respectively carried on the N PSFCH time slots.

[0030] In order to improve the probability of successful PSFCH feedback and further ensure that COT is not lost, N PSFCH feedback opportunities can be configured for the second resource, where N is a positive integer greater than 1. In this case, the number of PSFCH time slots determined by the first terminal device based on the second resource is also N. After receiving the indication information, the first terminal device sends N first signals, which are respectively carried in the N PSFCH time slots.

[0031] In this possible implementation, the first signal is sent in multiple PSFCH time slots, which can further reduce the risk of COT loss.

[0032] In a possible implementation of the first aspect, the number of PSFCH time slots is N, the COT includes M PSFCH time slots out of the N PSFCH time slots, and the above-mentioned step: sending a first signal on the PSFCH time slot includes: sending M first signals on the PSFCH time slot, and the M first signals are respectively carried on the M PSFCH time slots.

[0033] In some cases, although N PSFCH feedback opportunities are configured, the acquired COT only includes M PSFCH time slots out of the N PSFCH time slots. Since the purpose of sending the first signal is to ensure that the COT is not lost, the first terminal device does not need to send the first signal in all PSFCH time slots, but only needs to send the first signal in the PSFCH time slots within the COT.

[0034] In this possible implementation, the first signal is sent only on the PSFCH time slot within the COT, thereby saving signaling overhead.

[0035] In a possible implementation of the first aspect, the indication information may be represented by only one bit. Exemplarily, in a specified domain, a first value indicates that the first terminal device needs to send a first signal in a corresponding time slot, such as the first value is "1", and a second value indicates that no transmission is required, such as the second value is "0".

[0036] In a possible implementation manner of the first aspect, the first signal is carried on a common interlace.

[0037] Occupied channel bandwidth (OCB) regulations in some regions require that signal transmission occupy 80% of the nominal bandwidth (20MHz). For PSFCH transmission, OCB requirements must also be met. In this case, a common interlace structure can be constructed to make PSFCH transmission meet OCB regulatory requirements. In this case, the first signal is carried on the common interlace.

[0038] The second aspect of the present application provides a communication method, which is applied to a second terminal device. The second terminal device may be a terminal device, or the second terminal device may be a partial component in the terminal device (such as a processor, a chip or a chip system, etc.), or the second terminal device may also be a logic module or software capable of implementing all or part of the functions of the terminal device. The method includes: obtaining a channel occupancy time COT; sending sidelink control information SCI on a first resource, the SCI including indication information, the indication information being used to indicate sending a first signal, the first resource belonging to the COT, the SCI being used to schedule sidelink data, and the sidelink data being carried on a second resource.

[0039] The second terminal device may be a COT initiator, accessing the channel and acquiring the COT by executing a channel access process, for example, accessing the channel through a type 1 LBT mechanism. After acquiring the COT, the second terminal device may share resource information in the COT with the first terminal device.

[0040] The second terminal device can also be a device that shares COT resources. After the first terminal device executes the type 1LBT mechanism to access the channel and obtain the COT, it shares the resource information in the COT with the second terminal device. The resource information includes the time domain position and the frequency domain position. After receiving the shared resource information, the second terminal device also accesses the channel through the channel access process to obtain the COT.

[0041] The first resource belongs to the resources in the acquired COT. Specifically, the time domain resources in the first resource belong to the COT, and the frequency domain resources in the first resource belong to the frequency domain resources corresponding to the COT, that is, the frequency domain resources of the accessed channel. The first resource includes PSCCH resources and PSSCH resources.

[0042] SCI includes first-order SCI and second-order SCI, where the first-order SCI is carried on PSCCH and the second-order SCI is carried on PSSCH. The first terminal device can decode the second-order SCI and PSSCH only after correctly decoding the first-order SCI. The first-order SCI is used to schedule the second-order SCI and the sideline data sent by the second terminal device to the first terminal device. The sideline data is carried in the second resource, which is the PSSCH resource in the first resource, specifically including the time domain resources and frequency domain resources of PSSCH.

[0043] The indication information may be carried in the first-order SCI or the second-order SCI. The indication information is used to instruct the first terminal device to send the first signal in the corresponding feedback time slot, thereby ensuring that the channel is not in an idle state.

[0044] In the second aspect of the present application, the indication information sent by the second terminal device is used to indicate the sending of the first signal, so as to ensure as much as possible that the accessed channel is not in an idle state within the COT, thereby ensuring that the COT is not lost, thereby improving the competitiveness and system performance of the side communication system in the unlicensed frequency band.

[0045] In a possible implementation manner of the second aspect, the first signal is used to occupy the COT.

[0046] In this possible implementation, the first signal is not a real feedback signal, but is only used to occupy the COT. The first signal may have no practical meaning and is not used to carry feedback information such as ACK / NACK or conflict indication information. The second terminal device may not receive the first signal. Exemplarily, the first signal is a PSFCH-like signal. In this possible implementation, the form of the first signal is limited, which improves the feasibility of the solution.

[0047] In a possible implementation manner of the second aspect, the second resource corresponds to N PSFCH time slots, and the indication information is used to indicate sending N first signals, and the N first signals are respectively carried in the N PSFCH time slots.

[0048] In order to improve the probability of successful PSFCH feedback and further ensure that COT is not lost, N PSFCH feedback opportunities can be configured for the second resource, that is, the second resource corresponds to N PSFCH time slots. The indication information indicates that N first signals are sent, and the N first signals are respectively carried in N PSFCH time slots.

[0049] In this possible implementation, the first signal is sent in multiple PSFCH time slots, which can further reduce the risk of COT loss.

[0050] In a possible implementation of the second aspect, the second resource corresponds to N PSFCH time slots, the COT includes M PSFCH time slots among the N PSFCH time slots, and the indication information is used to indicate the sending of M first signals, and the M first signals are respectively carried in the M PSFCH time slots.

[0051] In some cases, although N PSFCH feedback opportunities are configured, the acquired COT only includes M PSFCH time slots out of the N PSFCH time slots. Since the function of the first signal is to ensure that the COT is not lost, it is not necessary to send the first signal in all PSFCH time slots, but only in the PSFCH time slots within the COT.

[0052] In this possible implementation, the first signal is sent only on the PSFCH time slot within the COT, thereby saving signaling overhead.

[0053] In a possible implementation of the second aspect, the indication information may be represented by only one bit. Exemplarily, in a specified domain, a first value indicates that the first signal needs to be sent in a corresponding time slot, such as the first value is "1", and a second value indicates that it does not need to be sent, such as the second value is "0".

[0054] In a possible implementation manner of the second aspect, the first signal is carried on a common interlace.

[0055] OCB regulations in some regions require that signal transmission occupy 80% of the nominal bandwidth (20MHz). For PSFCH transmission, OCB requirements must also be met. In this case, a common interlace structure can be constructed to make PSFCH transmission meet OCB regulatory requirements. In this case, the first signal is carried on the common interlace.

[0056] The third aspect of the present application provides a terminal device, including a transceiver unit and a processing unit. The processing unit is used to obtain a channel occupancy time COT; the transceiver unit is used to receive sidelink control information SCI on a first resource, the SCI includes indication information, the indication information is used to indicate the sending of a first signal, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource; the processing unit is also used to determine a physical sidelink feedback channel PSFCH time slot based on the second resource; the transceiver unit is also used to send a first signal on the PSFCH time slot.

[0057] In a possible implementation manner of the third aspect, the first signal is used to occupy the COT.

[0058] In a possible implementation manner of the third aspect, the processing unit is further configured to determine not to receive feedback information on a PSFCH timeslot.

[0059] In a possible implementation manner of the third aspect, the transceiver unit is specifically configured to send the first signal on the PSFCH time slot when there is no feedback information on the PSFCH time slot.

[0060] In a possible implementation manner of the third aspect, the processing unit is further configured to determine not to send the first signal on the PSFCH time slot when feedback information exists on the PSFCH time slot.

[0061] In a possible implementation of the third aspect, the processing unit is also used to determine the priority of the first signal and the priority of feedback information, and the feedback information is carried in the PSFCH time slot; the transceiver unit is specifically used to: when the priority of the first signal is higher than the priority of the feedback information, send the first signal on the PSFCH time slot.

[0062] In a possible implementation manner of the third aspect, the priority of the first signal is the same as the priority of the sidelink data.

[0063] In a possible implementation manner of the third aspect, the priority of the first signal is network configured, preconfigured, or predefined.

[0064] In a possible implementation manner of the third aspect, the number of PSFCH time slots is N, and the transceiver unit is specifically configured to send N first signals on the PSFCH time slot, and the N first signals are respectively carried on the N PSFCH time slots.

[0065] In a possible implementation of the third aspect, the number of PSFCH time slots is N, the COT includes M PSFCH time slots out of the N PSFCH time slots, and the transceiver unit is specifically used to send M first signals on the PSFCH time slot, and the M first signals are respectively carried on the M PSFCH time slots.

[0066] The terminal device provided in the third aspect of the present application is used to execute the method described in the first aspect or any possible implementation manner of the first aspect.

[0067] In a fourth aspect, the present application provides a terminal device, including a transceiver unit and a processing unit. The processing unit is used to obtain a channel occupancy time COT; the transceiver unit is used to send sidelink control information SCI on a first resource, the SCI includes indication information, the indication information is used to indicate that a first signal is sent, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource.

[0068] In a possible implementation manner of the fourth aspect, the first signal is used to occupy the COT.

[0069] In a possible implementation manner of the fourth aspect, the second resource corresponds to N PSFCH time slots, and the indication information is used to indicate the sending of N first signals, and the N first signals are respectively carried in the N PSFCH time slots.

[0070] In a possible implementation of the fourth aspect, the second resource corresponds to N PSFCH time slots, the COT includes M PSFCH time slots among the N PSFCH time slots, and the indication information is used to indicate the sending of M first signals, and the M first signals are respectively carried in the M PSFCH time slots.

[0071] The terminal device provided in the fourth aspect of the present application is used to execute the method described in the first aspect or any possible implementation manner of the first aspect.

[0072] In a fifth aspect, the present application provides a terminal device, comprising at least one processor, which is coupled to a memory; the memory is used to store programs or instructions; the at least one processor is used to execute the program or instructions so that the terminal device implements the method described in the first aspect or any possible implementation of the first aspect, or implements the method described in the second aspect or any possible implementation of the second aspect.

[0073] The sixth aspect of an embodiment of the present application provides a terminal device, comprising at least one logic circuit and an input / output interface; the logic circuit is used to execute the method described in the first aspect or any possible implementation of the first aspect, or the logic circuit is used to execute the method described in the second aspect or any possible implementation of the second aspect.

[0074] A seventh aspect of an embodiment of the present application provides a computer-readable storage medium storing one or more computer-executable instructions. When the computer-executable instructions are executed by a processor, the processor executes the method described in the first aspect or any possible implementation of the first aspect, or the processor executes the method described in the second aspect or any possible implementation of the second aspect.

[0075] An eighth aspect of an embodiment of the present application provides a computer program product (or computer program) storing one or more computers. When the computer program product is executed by the processor, the processor executes the method described in the first aspect or any possible implementation of the first aspect, or the processor executes the method described in the second aspect or any possible implementation of the second aspect.

[0076] A ninth aspect of an embodiment of the present application provides a chip system, which includes at least one processor for supporting a terminal device to implement the functions involved in the above-mentioned first aspect or any possible implementation of the first aspect, or for supporting a terminal device to implement the functions involved in the above-mentioned second aspect or any possible implementation of the second aspect.

[0077] In a possible design, the chip system may also include a memory for storing program instructions and data necessary for the terminal device. The chip system may be composed of a chip, or may include a chip and other discrete devices. Optionally, the chip system also includes an interface circuit for providing program instructions and / or data to the at least one processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1a A schematic diagram of an application scenario of the communication method provided in an embodiment of the present application;

[0079] Figure 1b A schematic diagram of another application scenario of the communication method provided in an embodiment of the present application;

[0080] Figure 1c A schematic diagram of another application scenario of the communication method provided in an embodiment of the present application;

[0081] Figure 1d A schematic diagram of another application scenario of the communication method provided in an embodiment of the present application;

[0082] Figure 2 A schematic diagram of an embodiment of a communication method provided in an embodiment of the present application;

[0083] Figure 3 A schematic diagram of a sending process of indication information in an embodiment of the present application;

[0084] Figure 4 A schematic diagram of PSFCH resource configuration in an embodiment of the present application;

[0085] Figure 5 A schematic diagram of a PSFCH resource bit map in an embodiment of the present application;

[0086] Figure 6 A schematic diagram of PSSCH corresponding to PSFCH time domain resources in an embodiment of the present application;

[0087] Figure 7 A schematic diagram of PSFCH frequency domain resource allocation in an embodiment of the present application;

[0088] Figure 8 A schematic diagram of configuring multiple PSFCH feedback opportunities in an embodiment of the present application;

[0089] Fig. 9 A schematic diagram of an interlace resource block in an embodiment of the present application;

[0090] Fig.10 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0091] Fig.11 Another schematic diagram of the structure of the terminal device provided in the embodiment of the present application;

[0092] Fig.12 Another schematic diagram of the structure of the terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0093] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0094] To facilitate understanding, the relevant terms and concepts mainly involved in the embodiments of the present application are first introduced below.

[0095] 1. The terminal device involved in the present application includes a device that provides voice to a user, a device that provides data connectivity to a user, and a device that provides voice and data connectivity to a user. For example, it may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The terminal device can communicate with a core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal device may include a terminal device (or user equipment (UE)), a wireless terminal, a mobile terminal, a device-to-device (D2D) communication terminal, a vehicle to everything (V2X) terminal, a road side unit (RSU), a machine-to-machine / machine-type communications (M2M / MTC) terminal, an Internet of Things (IoT) terminal, a subscriber unit, a subscriber station, a mobile station, a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, or a user device, etc. It may include a mobile phone (or a "cellular" phone), a computer with a mobile terminal, a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. It may include personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA) and other devices. The terminal device may also be a chip, a chip system or a processor. The terminal device also includes a restricted device, a device with low power consumption, or a device with limited storage capacity, or a device with limited computing power, etc.The terminal device may include information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning systems (GPS), laser scanners, etc.

[0096] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for the application of wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0097] The various terminal devices introduced above, if located on a vehicle, such as placed in a vehicle or installed in a vehicle, can be considered as a vehicle-mounted terminal, which is also called an on-board unit (OBU). In addition, the terminal device can also be the entire vehicle, or a telematics box (T-box) in the vehicle.

[0098] In the embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device, or a circuit capable of supporting the terminal device to realize the function, or a circuit that can be applied to a chip system, which may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for realizing the function of the terminal as an example, which is a terminal.

[0099] 2. The network equipment involved in this application may include radio access network (RAN) equipment, such as base stations (e.g., access points). It may refer to equipment in an access network that communicates with a terminal device through an air interface, or a network device in a vehicle-to-everything (V2X) technology is a roadside unit (RSU). The base station can be used to convert received air frames to and from IP packets, acting as a router between the terminal and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications and exchanges messages with other entities that support V2X applications. The network equipment may also coordinate the attribute management of the air interface. For example, the network device may include an evolutionary Node B (NodeB or eNB or e-NodeB) in a long term evolution (LTE) system or an advanced long term evolution (LTE-A), or may include an evolved packet core network (EPC), a fifth generation communication technology (5G), a new radio (NR) system (also referred to as an NR system) in a next generation node B (gNB) or a centralized unit (CU) and a distributed unit (DU) in a cloud access network (Cloud RAN) system, and the embodiments of the present application are not limited. The network device may also include a core network device, and the core network device may include, for example, an access and mobility management function (AMF), etc. For RSU, it should be noted that it can be a network type RSU or a terminal device type RSU. When acting as a network-type RSU, it performs the functions of a network-type device; when acting as a terminal-type RSU, it performs the functions of a terminal device.

[0100] Among them, the network device can send configuration information to the terminal device (for example, carried in a scheduling message and / or an indication message), and the terminal device further performs network configuration according to the configuration information, so that the network configuration between the network device and the terminal device is aligned; or, through the network configuration preset in the network device and the network configuration preset in the terminal device, the network configuration between the network device and the terminal device is aligned. Specifically, "alignment" means that when there is an interactive message between the network device and the terminal device, the two have a consistent understanding of the carrier frequency for sending and receiving the interactive message, the determination of the interactive message type, the meaning of the field information carried in the interactive message, or other configurations of the interactive message.

[0101] In addition, in other possible cases, the network device may be other devices that provide wireless communication functions for the terminal device. The embodiments of the present application do not limit the specific technology and specific device form used by the network device. For the convenience of description, the embodiments of the present application do not limit.

[0102] The network equipment may also include core network equipment, which may include, for example, AMF, user plane function (UPF) or session management function (SMF).

[0103] In the embodiment of the present application, the device for realizing the function of the network device may be a network device, or may be a device capable of supporting the network device to realize the function, such as a chip system, which may be installed in the network device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for realizing the function of the network device as an example that the network device is used as the device.

[0104] 3. Device-to-device (D2D) technology

[0105] D2D technology refers to the technology of direct communication between two or more terminal devices. Typical D2D devices include Bluetooth, WiFi-Direct devices, etc. In the wireless communication network defined by the 3rd Generation Partnership Project (3GPP), the air interface used by D2D technology is PC5, so D2D communication is also called PC5 communication. From the perspective of the link, the link used by D2D technology is the sidelink (SL), so D2D communication can also be called Sidelink communication, which corresponds to the uplink and downlink in the current communication system.

[0106] 4. Sidelink

[0107] The terminal devices can communicate sideways, that is, they can communicate directly with each other without forwarding by network devices. In this case, the link between the terminal devices directly connected to each other is called a sidelink.

[0108] Usually, in Sidelink technology, terminal devices can directly connect information through the PC5 interface between each other. In this application, the sidelink can be expressed in English as Sidelink or side link. The two have the same meaning and are both expressions of the English sidelink in this application. This technology can not only provide information interaction within the coverage service range of network equipment, but also in places without network equipment coverage. Terminal devices authorized for special communications can adopt Sidelink communication. Sidelink communication includes a variety of usage scenarios, typical applications are vehicle-to-everything (V2X) communication and communication between smart terminals.

[0109] 5. Internet of Vehicles

[0110] Vehicle-to-everything (V2X) is the communication between cars and other vehicles or terminal devices that may affect cars, including vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), vehicle-to-infrastructure (V2I), and vehicle-to-network (V2N). Typical examples of communication between smart terminals include communication between mobile phones and wearable devices, communication between AR / VR helmets or glasses and smart screens, and communication between sensors.

[0111] 6. Resource pool

[0112] In V2X, network equipment can configure resource pools for SL communication of V2X terminal devices. A resource pool is a collection of time-frequency resources. Two resource allocation modes are defined in V2X:

[0113] Mode 1: The network device schedules or configures Sidelink resources to the terminal device for Sidelink transmission;

[0114] Mode 2: The terminal device autonomously selects resources.

[0115] Optionally, mode 2 is implemented in such a way that the terminal device senses which resources are not used by other terminal devices in the (pre)configured resource pool and selects an appropriate number of such resources for its own transmission. V2X supports resource sensing and selection or reselection processes in mode 2. The sensing process can also be based on demodulating the SCI of other terminal devices or other Sidelink measurement results. The demodulated SCI reflects the resource usage on the Sidelink. The resource selection or reselection process can determine the resources used for Sidelink transmission based on the results of the above sensing process.

[0116] 7. Configuration and pre-configuration

[0117] In this application, configuration and pre-configuration will be used at the same time. Configuration refers to the network equipment or server or terminal device sending some parameter configuration information or parameter values ​​to the terminal through messages or signaling, so that the terminal device can determine the communication parameters or resources during transmission based on these values ​​or information. For example, within the network coverage, the terminal device can obtain SL resource pool configuration information by receiving the system information block (SIB) of the network device, the cell-level (cell-specific) radio resource control (RRC) signaling, or the terminal device user-level (UE-specific) RRC signaling. Pre-configuration is similar to configuration. It can be a way to define the corresponding parameters or parameter values, or to write the relevant parameters or values ​​to the terminal device in advance. This application does not limit this. Furthermore, these values ​​and parameters can be changed or updated.

[0118] See below Figure 1a to Figure 1d , which is a schematic diagram of an application scenario of the communication method provided in an embodiment of the present application.

[0119] The communication method provided in the embodiment of the present application is applicable to side link communication scenarios, specifically including scenarios with network coverage and scenarios without network coverage.

[0120] As shown in the figure, the application scenario includes a terminal device 101, a terminal device 102, a network device 103 and a network device 104. In which, the signal coverage range of the network device is an elliptical area as an example, Figure 1a , Figure 1b as well as Figure 1c For scenarios with network coverage. Figure 1a The terminal device 101 and the terminal device 102 are both within the coverage of the network device 103. Figure 1b The terminal device 101 is within the coverage of the network device 103. Figure 1cIn the example, the terminal device 101 is within the coverage of the network device 103, and the terminal device 102 is within the coverage of the network device 104. The terminal device 101 can communicate with the terminal device 102 using the sidelink resources in a manner scheduled by the network device 103. The resources can be called authorized resources or authorized frequency bands. Alternatively, the terminal device 101 can select resources by itself, that is, select resources for sidelink communication from a resource pool to communicate with the terminal device 102. The resources can be called unlicensed resources or unlicensed frequency bands.

[0121] Figure 1d This is a scenario without network coverage, where both the terminal device 101 and the terminal device 102 are outside the coverage of the network equipment. In this scenario, the terminal device 101 can only communicate with the terminal device 102 by establishing a side link in a resource self-selection manner.

[0122] Exemplarily, in the NR-V2X system, the sidelink communication scenario can be unicast, multicast or broadcast. Among them, there are two scenarios for multicast, namely multicast 1 and multicast 2. In unicast and multicast scenarios, the receiving device is supported to perform physical layer feedback, such as hybrid automatic repeat request (HARQ) feedback, while no feedback is performed in the broadcast scenario. The following are exemplary explanations.

[0123] In the unicast scenario, a transmitting device and a receiving device form a unicast connection pair. After correctly receiving a control message from the transmitting device, the receiving device sends a PSFCH sequence carrying ACK information to the transmitting device based on the HARQ enable indication information of the control message. If the HARQ enable indication information is correctly decoded on the PSSCH, the receiving device sends a PSFCH sequence carrying ACK information to the transmitting device. Otherwise, the receiving device sends a PSFCH sequence carrying NACK information.

[0124] Multicast 1 scenario, that is, a negative acknowledgement (NACK-only) scenario. In multicast 1 scenario, if the receiving device can correctly decode the PSCCH corresponding to the PSSCH, but the PSSCH decoding fails, a PSFCH sequence carrying NACK information is fed back, otherwise no information is fed back.

[0125] In the multicast 2 scenario, that is, the confirmation character / negative character (NACK / ACK) scenario, in the multicast 2 scenario, if the receiving device can correctly decode the PSCCH corresponding to the PSSCH, but the PSSCH decoding fails, then the PSFCH sequence carrying the NACK information is fed back, otherwise the PSFCH sequence carrying the ACK information is fed back.

[0126] The above HARQ-ACK feedback is carried on the PSFCH resources. In addition, the terminal device may also send conflict indication information on the PSFCH resources to indicate that there is a conflict between the two reserved resources.

[0127] The broadcast scenario is similar to the network device broadcasting system information, that is, the sending device sends the broadcast service data to the outside without encryption. Any other terminal device within the effective receiving range can receive the data of the broadcast service if it is interested in the broadcast service, and no feedback is provided after receiving it.

[0128] In addition, when the HARQ feedback in the SCI is disabled (ie, the HARQ disabled scenario), the receiver of the PSSCH data does not need to perform HARQ-ACK feedback.

[0129] It should be understood that the resources described in the embodiments of the present application are time-frequency resources, and the spectrum resources used by the side link may be unlicensed frequency bands, licensed frequency bands and / or dedicated frequency bands.

[0130] Before using unlicensed frequency bands for transmission, it is necessary to meet regional regulatory requirements before channel access can be performed, such as through the LBT mechanism. LBT is essentially a channel access rule based on random backoff, that is, before the terminal device accesses the channel and starts sending data, it needs to sense whether the channel is idle. If the channel has been 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 occupying the channel.

[0131] After the terminal device accesses the channel through the LBT mechanism, it obtains the channel occupancy time (COT). For example, the terminal device that accesses the channel through the type 1LBT mechanism and executes the type 1LBT mechanism to occupy the channel can be called the COT initiator. Unlicensed spectrum resources can be shared between different terminal devices, that is, as long as the network equipment complies with certain regulations, the spectrum can be used to receive and send information. In other words, the COT initiator can share the spectrum with other terminal devices and send the shared resources in the COT, including the time domain position and the frequency domain position, to other terminal devices. After receiving the shared information, other terminal devices access the channel by executing the LBT mechanism. The LBT mechanism is the remaining LBT mechanism except the type 1LBT mechanism, such as the type 2A LBT mechanism. After accessing the channel, the terminal device that shares the COT resources can use the specified frequency domain resources in the specified time domain to send information. It can be understood that COT includes the duration occupied by the COT initiator to send data and the duration occupied by other devices that share the COT resources to send data.

[0132] Currently, for devices that transmit data in COT, it is not clear about the data transmission status of the opposite device. Exemplarily, terminal device 101 sends data to terminal device 102, and the communication scenario is a HARQ disabled scenario. When terminal device 102 fails to decode PSSCH, no feedback will be provided. However, terminal device 101 is not sure whether terminal device 102 will provide feedback, so it will not send a signal, and terminal device 102 is not clear about the transmission status of terminal device 101, so it will not send another signal. This causes the channel to be idle. When the channel idle time exceeds the interval time specified by LBT, the channel is allowed to be preempted, resulting in the loss of COT. For example, in a normal cyclic prefix (Normal CP) system, the PSFCH resource occupies two orthogonal frequency-division multiplexing (orthogonal frequency-division multiplexing, OFDM) symbols, and there is a gap (GAP) symbol before the PSFCH resource, that is, the waiting time for PSFCH feedback by terminal device 101 is 3 OFDM symbols. When the subcarrier spacing is 15KHz, the duration of one OFDM symbol is 66.67 microseconds. Under the Type 2A LBT mechanism, the allowed interval time does not exceed 25 microseconds. Therefore, the channel idle time exceeds the interval time specified by LBT, and the channel is allowed to be preempted by other terminal devices, and there is a risk of COT loss.

[0133] In view of this, an embodiment of the present application provides a communication method, in which a transmitting device instructs a receiving device to send a signal in a corresponding PSFCH time slot through indication information, thereby alleviating the COT loss caused by channel idleness and improving the competitiveness and system performance of the side communication system in the unlicensed frequency band.

[0134] It is understandable that the communication method provided in the embodiments of the present application can be applied to various types of communication systems. In addition to the NR-V2X system in the above business scenarios, it can also be applied to various Internet of Vehicles systems or D2D systems, as well as LTE cellular networks or NR cellular networks, which are not specifically limited here.

[0135] In addition, in addition to being applicable to multicast 1 scenarios and broadcast scenarios where PSFCH feedback is not performed, the communication method can also be applied to various service scenarios, such as unicast scenarios. The service scenarios are not specifically limited in the embodiments of the present application.

[0136] See below Figure 2 , is a schematic diagram of an embodiment of the communication method provided in the embodiment of the present application. Figure 2 As shown, this embodiment includes steps 201 to 204.

[0137] It should be noted that Figure 2 In the example, the first terminal device and the second terminal device are used as the execution subjects of the interaction indication to illustrate the method, but the present application does not limit the execution subjects of the interaction indication. Figure 2 In the corresponding implementation, the execution subject may be a first terminal device, or a chip, a chip system, or a processor that supports the first terminal device to implement the method, or a logic module or software that can implement all or part of the functions of the first terminal device. Similarly, when the execution subject is a second terminal device, the second terminal device may also be replaced by a chip, a chip system, or a processor that supports the second terminal device to implement the method, or a logic module or software that can implement all or part of the functions of the second terminal device.

[0138] 201. A first terminal device and a second terminal device obtain a channel occupancy time COT.

[0139] After the first terminal device and the second terminal device access the channel, they obtain the COT, and data transmission can be performed within the COT.

[0140] In one possible solution, the first terminal device is a COT initiator, and accesses the channel and obtains the COT by executing the channel access process, for example, accessing the channel through the type 1 LBT mechanism. After the first terminal device obtains the COT, the resource information in the COT can be shared with the second terminal device, and the resource information includes the time domain position and the frequency domain position. After receiving the shared resource information, the second terminal device also accesses the channel through the channel access process, for example, accesses the channel through the Type 2A LBT mechanism, thereby obtaining the COT, and can send information in the specified time domain using the specified frequency domain resources.

[0141] In another possible solution, the second terminal device is the device that first seizes the channel, and the first terminal device is the device that shares the COT resources. Specifically, the second terminal device accesses the channel and obtains the COT by executing the channel access process, such as accessing the channel through the type 1LBT mechanism. At this time, the second terminal device is the COT initiator. After the second terminal device obtains the COT, it shares the resource information in the COT with the first terminal device. The resource information includes the time domain position and the frequency domain position. After receiving the shared resource information, the first terminal device also accesses the channel through the channel access process, such as accessing the channel through the Type 2A LBT mechanism, thereby obtaining the COT, and can send information in the specified time domain using the specified frequency domain resources.

[0142] 202. The second terminal device sends sidelink control information SCI on the first resource. The SCI includes indication information, and the indication information is used to instruct the first terminal device to send a first signal. The first resource belongs to COT. The SCI is used to schedule sidelink data, and the sidelink data is carried on the second resource.

[0143] After both the first terminal device and the second terminal device obtain the COT, the second terminal device sends an SCI to the first terminal device on the first resource. The SCI includes indication information. The second terminal device instructs the first terminal device to send a first signal through the indication information.

[0144] The first resource belongs to the resources in the acquired COT. Specifically, the time domain resources in the first resource belong to the COT, and the frequency domain resources in the first resource belong to the frequency domain resources corresponding to the COT, that is, the frequency domain resources of the accessed channel. The first resource includes PSCCH resources and PSSCH resources.

[0145] SCI includes first-order SCI and second-order SCI, where the first-order SCI is carried on PSCCH and the second-order SCI is carried on PSSCH. The terminal device can decode the second-order SCI and PSSCH only after correctly decoding the first-order SCI. The first-order SCI is used to schedule the second-order SCI and the sideline data sent by the second terminal device to the first terminal device. The sideline data is carried in the second resource, which is the PSSCH resource in the first resource, specifically including the time domain resources and frequency domain resources of PSSCH.

[0146] The indication information may be carried in a first-order SCI or a second-order SCI. The indication information is used to instruct the first terminal device to send a first signal in the corresponding feedback time slot, thereby ensuring that the channel is not in an idle state. In one possible scheme, the indication information may be represented by only 1 bit. Exemplarily, in a specified domain, a first value indicates that the first terminal device needs to send a first signal in the corresponding time slot, such as the first value is "1", and a second value indicates that no transmission is required, such as the second value is "0". Of course, the indication information may also directly instruct the first terminal device to send the first signal. When the indication information is not received, there is no need to send the first signal. It is understandable that when the second terminal device also sends side data to multiple terminal devices, the second terminal device can in addition to instructing the first terminal device to send the first signal, it can also simultaneously instruct multiple other devices to send the first signal.

[0147] In a possible solution, the first signal is not a real feedback signal, but is only used to occupy the COT. The first signal may have no practical meaning and is not used to carry ACK / NACK or conflict indication information. After the first terminal device sends the first signal, the second terminal device may not receive the first signal. Exemplarily, the first signal is a PSFCH-like signal.

[0148] Exemplarily, the sending process of the indication information can be combined with Figure 3 To understand. Figure 3 The second terminal device is the COT initiator, accesses the channel through LBT, and obtains COT including time slots 0 to 6. The second terminal device sends side data to the first terminal device and the third terminal device respectively in time slot 0. The first terminal device and the third terminal device as responding devices are not clear about the transmission status of the first terminal device, that is, whether the first terminal device will continue to send data. However, the second terminal device sends indication information to the first terminal device in time slot 0, so the first terminal device will send the first signal in the corresponding PSFCH time slot (that is, time slot 3), and the situation where both devices do not send signals will not occur, that is, the channel will not be in an idle state, thereby avoiding the risk of COT loss.

[0149] Figure 3 In the example, the second terminal device instructs the first terminal device to send the first signal. In addition, the second terminal device may also instruct the third terminal device to send the first signal, or instruct the first terminal device and the third terminal device to send the first signal at the same time, so that both devices will send the first signal, thereby further reducing the risk of COT loss. When instructing the first terminal device and the third terminal device at the same time, the second terminal device needs to send indication information to the first terminal device and the third terminal device respectively, and the indication information is respectively carried in the SCI corresponding to the first terminal device and the SCI corresponding to the third terminal device.

[0150] Figure 3 The resources (including time domain resources and frequency domain resources) of time slot 2 are the resources shared by the second terminal device with the first terminal device. The first terminal device can use the designated frequency domain resources to transmit data to the second terminal device in time slot 2. At this time, the first terminal device is the data transmitter, and the first terminal device can send indication information to the second terminal device in time slot 2. After receiving the indication information, the second terminal device will send the first signal in the corresponding PSFCH time slot (i.e., time slot 5).

[0151] 203. The first terminal device determines a physical sidelink feedback channel PSFCH time slot based on the second resource.

[0152] The sidelink data is carried in the second resource, and the first terminal device can determine the PSFCH time slot corresponding to the second resource based on the second resource and pre-configured information, wherein the pre-configured information includes the period information of the PSFCH.

[0153] Combine the following Figures 4 to 7 The process of determining PSFCH resources is exemplified.

[0154] In the sidelink, the use of PSFCH to transmit HARQ-ACK and conflict indication information is supported. The following mainly uses PSFCH feedback information as HARQ-ACK feedback as an example for explanation. For a PSSCH transmission, if the second terminal device carries HARQ-ACK feedback enable information in the control information, the first terminal device needs to feedback the ACK / NACK information of the response based on the PSSCH decoding result, where the ACK / NACK information is transmitted through the PSFCH channel. The PSFCH channel resource is a periodic resource configured in the resource pool, and its periodic configuration parameters are Can be 0, 1, 2, 4. It indicates that there is no PSFCH resource configuration in the resource pool and PSFCH transmission is not enabled in the resource, that is, physical layer HARQ feedback is not supported. It means that every There will be a PSFCH feedback slot for each time slot, for example It means that there will be a PSFCH feedback time slot every 2 time slots. Figure 4 shown. Figure 4 A symbol format for time slots in the Normal CP system. PSSCH occupies the first 10 symbols, and PSFCH occupies the last two symbols before the GAP.

[0155] Depend on Figure 4 It can be seen that if PSFCH feedback resources are configured in the resource pool, PSFCH feedback resources are configured once every N time slots. The specific process of determining the PSFCH resources corresponding to each sub-channel is as follows.

[0156] The resource pool is configured with a bitmap of PSFCH frequency domain resources to indicate whether a specific physical resource block (PRB) on the frequency domain resources of the resource pool can be used as a PSFCH resource, that is, the length of the bit information contained in the bitmap is equal to the number of PRBs in the resource pool. 1 in the bitmap indicates that the corresponding PRB can be used for PSFCH transmission, and bit 0 indicates that the corresponding PRB resource cannot be used for PSFCH transmission. In particular, PSFCH resources can be used for HARQ-ACK transmission, and its resources are represented by the "sl-PSFCH-RB-Set" bitmap. The bit value of 1 in the bitmap indicates that the PRB resource corresponding to it can be used for HAQR-ACK feedback. PSFCH resources can also be used for Scheme 2 conflict indication. Its resources are represented by the "sl-RB-SetPSFCH" bitmap. The bitmap value of 1 indicates that the corresponding PRB resource can be used as a scheme 2 conflict indication. It should be noted that the positions where the bit value is 1 in "sl-PSFCH-RB-Set" and "sl-RB-SetPSFCH" do not overlap. Figure 5 As shown in the figure, in a time slot with PSFCH transmission resources, assuming that a subchannel contains 10 PRBs and there are 3 subchannels in the resource pool, the bit map indicating the PSFCH frequency domain resources in the resource pool contains a total of 3*10=30 bits, indicating whether each PRB can be used for PSFCH transmission. Figure 5 As shown in , the first 4 PRBs of each subchannel can be used as PSFCH feedback. The bitmap can be used to indicate the above-mentioned HARQ-ACK resources, and can also be used to indicate scheme 2 conflict resources.

[0157] Since each of the N PSSCH time slots corresponds to a PSFCH feedback time slot, for the N subch For a resource pool of sub-channels, the number of PSFCH feedback resources corresponding to each sub-channel is in Indicates the number of PRBs of the PSFCH frequency domain resources, that is, the total number of bits with a value of 1 in the bit map indicating the PSFCH frequency domain resources.

[0158] Considering the decoding capability limitation of the first terminal device, the first terminal device may not be able to provide feedback immediately after receiving the PSSCH. Therefore, the standard defines a PSSCH feedback time interval K, that is, PSSCH transmits PSFCH in the first available time slot containing PSFCH resources, which is at least K time slots away from the time slot where PSSCH is located. The value of K is configured by the resource pool, that is, the PSSCH transmission in time slot n corresponds to a PSFCH time slot no earlier than time slot n+K. Figure 6 As shown in the figure, 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 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, these four PSSCH time slots can be called PSSCH time slots associated with the same PSFCH time slot, or called PSSCH bundling window length.

[0159] The PSFCH available resources in a PSFCH feedback time slot are allocated to each subchannel in the feedback cycle in the order of time domain first and frequency domain second. Figure 7 As shown, when When K=2, the PSFCH resources corresponding to each subchannel in the four bound PSSCH time slots are numbered as shown in the figure, that is, a PSFCH feedback resource of one PRB is allocated to each subchannel in each time slot. The formula is: for the i-th time slot in the N bound PSSCH time slots, if the frequency domain subchannel number in its resource pool is j, then the corresponding PSFCH resource is If two sub-channels are used to transmit data, such as Figure 7 The frequency domain 5 and 9 in time slot 1 correspond to PSFCH resources 5 and 9 respectively, which are not continuous in the frequency domain.

[0160] It should be understood that the above Figures 4 to 7 The process of determining PSFCH resources is explained by taking a PSFCH transmission occupying one PRB as an example. In fact, the embodiment of the present application does not specifically limit the PSFCH frequency domain resources corresponding to the PSSCH transmission. For example, in an unlicensed frequency band, a PSFCH transmission may include multiple PRB resources (i.e., PRB subsets) and a common interlace. Alternatively, a PSFCH transmission includes an interlace. When a PSFCH transmission includes multiple PRBs and a common interlace, or a PSFCH transmission includes an interlace, the specific process of determining the PSFCH resources must also be changed accordingly (i.e., the same as above). Figures 4 to 7 The process is different from that described in ), and the details will not be repeated here.

[0161] So through Figures 4 to 7 According to the steps described in , the first terminal device can associate the second resource with the PSFCH, thereby determining the PSFCH time slot corresponding to the second resource.

[0162] 204. The first terminal device sends a first signal in a PSFCH time slot.

[0163] After the first terminal device determines the PSFCH time slot in step 203 , in step 204 , the first terminal device sends a first signal on the determined PSFCH time slot.

[0164] In a possible solution, the indication information indicates that the first terminal device sends a first signal in a PSFCH time slot, but other terminal devices send feedback information to the first terminal device in the same time slot, and the first terminal device has a transmission / reception conflict. In view of this situation, the behavior of the first terminal device when the transmission / reception conflict occurs is defined.

[0165] Optionally, the first terminal device determines not to receive feedback information on the PSFCH time slot where the first signal needs to be sent, that is, the first terminal device does not expect to receive feedback information on the time slot. At this time, the first terminal device does not perform priority judgment, and sends the first signal on the corresponding PSFCH time slot after receiving the indication information, thereby ensuring that the channel is not in an idle state and ensuring that the COT is not lost.

[0166] Optionally, when there is no feedback information on the PSFCH time slot, the first terminal device chooses to send the first signal. When there is feedback information on the PSFCH time slot, the first terminal device preferentially chooses to receive the feedback information and does not send the first signal, thereby ensuring normal feedback of the service.

[0167] The communication system may also define the priority of the first signal and the feedback information, and the first terminal device determines to send the first signal or receive the feedback information based on the priority information. When the priority of the first signal is higher than the feedback information, the first terminal device determines to send the first signal. Otherwise, the first terminal device chooses to receive the feedback information.

[0168] Optionally, the priority of the first signal is the same as the priority of the sidelink data carried in the second resource, and the priority of the feedback information sent by other terminal devices is the same as the priority of the sidelink data sent by the first terminal device to the terminal device.

[0169] Optionally, the priority of the first signal is network configured, preconfigured or predefined. For the priority of the first signal and the feedback information, a value can be (pre) set or predefined, for example, the priority of the first signal is set to 1, the priority of the feedback information is set to 2, and the smaller the priority value, the higher the priority, then the priority of the first signal is higher than the priority of the feedback information.

[0170] The priority of the first signal may be carried in the first-order SCI, and there is a fixed field in the first-order SCI for indicating the priority. The first terminal device can determine the priority of the first signal after decoding the first-order SCI.

[0171] In a possible solution, in order to improve the probability of successful PSFCH feedback and further ensure that COT is not lost, N PSFCH feedback opportunities can be configured for the second resource, where N is a positive integer greater than 1. In this case, the number of PSFCH time slots determined by the first terminal device based on the second resource is also N. After receiving the indication information, the first terminal device sends a first signal on the N PSFCH time slots.

[0172] Specific can be combined Figure 8 Understand. Figure 8 As shown, one PSSCH transmission configured on the resource pool corresponds to four PSFCH candidate feedback opportunities (i.e., N is equal to 4). Assume that the period of PSFCH is 2 and the time interval K is also 2. The second terminal device transmits sideline data in time slot 0 and time slot 1, then the sideline data on time slot 0 and time slot 1 corresponds to four PSFCH feedback opportunities, which are located in time slot 3, time slot 5, time slot 7 and time slot 9 respectively. In the figure, the frequency domain resources in each PSFCH time slot are divided into four resource sets, namely PSFCH resource set 1 to PSFCH resource set 4, and one PSFCH resource set corresponds to one PSFCH candidate feedback opportunity. Taking a PSSCH transmission on time slot 0 as an example, the corresponding first feedback resource is located in time slot 3, the second feedback resource is located in time slot 5, the third feedback resource is located in time slot 7, and the fourth feedback resource is located in time slot 9. In other words, one PSSCH transmission has corresponding feedback resources in multiple time slots.

[0173] Optionally, for a scenario where N feedback opportunities are configured (ie, N PSFCH time slots), the first terminal device sends the first signal in each of the N PSFCH time slots. Figure 8 , the first terminal device sends the first signal in time slot 3, time slot 5, time slot 7 and time slot 9.

[0174] Optionally, for a scenario where N feedback opportunities are configured (i.e., N PSFCH time slots), but the acquired COT only occupies M PSFCH time slots (M≤N) among the N PSFCH time slots, the first terminal device only sends the first signal on the M PSFCH time slots. Figure 8 , the PSSCH transmissions on time slot 0 and time slot 1 correspond to four PSFCH candidate time slots, namely time slot 3, time slot 5, time slot 7 and time slot 9. However, if the COT is time slot 0 to time slot 7, the first terminal device only sends the first signal on time slot 3, time slot 5 and time slot 7, and no longer sends it on time slot 9.

[0175] It can be understood that when multiple PSFCH feedback opportunities are configured, the rules for transmission and reception conflicts described above are applicable to each feedback opportunity.

[0176] In one possible solution, occupied channel bandwidth (OCB) regulations in some regions require that signal transmissions occupy 80% of the nominal bandwidth (20 MHz). For PSFCH transmissions, the OCB requirement also needs to be met.

[0177] Optionally, for PSFCH format 0, a design that meets the OCB requirements is to introduce a common PSFCH resource, which can be a common interlace or other common PRBs. Define interlace m∈{0,1,…,M-1} to include multiple {m,M+m,2M+m,3M+m,…} resource blocks (RBs). When the subcarrier spacing is 15KHz, M=10, and when the subcarrier spacing is 30KHz, M=5. Fig. 9 As shown, for a subcarrier spacing of 15 kHz, there are 10 interlaces, each using the 10th PRB, namely RB#1, RB#11...RB#91. A subchannel may include K interlaces, where K is (pre)configured, for example, when K=1, a subchannel includes 1 interlace.

[0178] A common interlace structure is defined through the resource pool, and then the first terminal device in the resource pool transmits the corresponding HARQ feedback information on other non-Common PSFCH resources according to the PSSCH-PSFCH mapping rules of R16 / R17. Therefore, in this solution, the first signal sent on the PSFCH time slot is carried on the common interlace.

[0179] Optionally, for PSFCH format 0, another design that meets the OCB requirements is that one PSFCH transmission occupies one interlace. In this scheme, the first signal can be carried on the (pre) configured interlace, or the first signal uses the (pre) configured PSFCH sequence and is carried on the interlace corresponding to the PSSCH transmission.

[0180] It can be understood that the embodiments of the present application do not limit the PSFCH sequence used by the first signal and / or the frequency domain resources of the first signal.

[0181] In this embodiment, the second terminal device sends an indication message to the first terminal device, instructing the first terminal device to send the first signal in the corresponding PSFCH time slot, thereby avoiding the channel being idle for too long, ensuring that the COT will not be lost as much as possible, and improving the competitiveness and system performance of the side communication system in the unlicensed frequency band. In addition, the behavior of the first terminal device when there is a conflict between sending and receiving is defined, and the first terminal device can give priority to sending the first signal to ensure that the COT is not lost. Alternatively, the first terminal device can also give priority to receiving feedback information to ensure normal feedback of the service, so that the first signal will not interfere with the normal development of the service. In addition, in the case of multiple PSFCH time slots, the indication information can instruct the first terminal device to send multiple first signals, thereby further reducing the risk of COT loss.

[0182] The above describes the embodiments of the present application from the perspective of the method. The following describes the relevant devices in the embodiments of the present application from the perspective of specific device implementation.

[0183] See also Fig.10 , is a schematic diagram of a terminal device 1000 provided in an embodiment of the present application, and the terminal device 1000 includes a processing unit 1001 and a transceiver unit 1002. The terminal device 1000 can implement the functions of any terminal device (such as the first terminal device or the second terminal device) in the above method embodiment, and thus can also achieve the beneficial effects of the above method embodiment.

[0184] In a possible implementation, when the terminal device 1000 is used to execute the method executed by the first terminal device in the aforementioned embodiment, the processing unit 1001 and the transceiver unit 1002 included in the terminal device 1000 are used to implement the following process.

[0185] The processing unit 1001 is used to obtain the COT.

[0186] The transceiver unit 1002 is used to receive SCI on the first resource, the SCI includes indication information, the indication information is used to indicate sending a first signal, the first resource belongs to COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on the second resource.

[0187] The processing unit 1001 is further configured to determine a PSFCH time slot based on the second resource.

[0188] The transceiver unit 1002 is further configured to send a first signal in the PSFCH timeslot.

[0189] Optionally, the first signal is used to occupy the COT.

[0190] Optionally, the processing unit 1001 is further configured to determine not to receive feedback information on the PSFCH timeslot.

[0191] Optionally, the transceiver unit 1002 is specifically configured to send a first signal on a PSFCH time slot when there is no feedback information on the PSFCH time slot.

[0192] Optionally, the processing unit 1001 is further configured to determine not to send the first signal on the PSFCH time slot when there is feedback information on the PSFCH time slot.

[0193] Optionally, the processing unit 1001 is also used to determine the priority of the first signal and the priority of feedback information, and the feedback information is carried in the PSFCH time slot; the transceiver unit 1002 is specifically used to send the first signal on the PSFCH time slot when the priority of the first signal is higher than the priority of the feedback information.

[0194] Optionally, the priority of the first signal is the same as the priority of the sidelink data.

[0195] Optionally, the priority of the first signal is network configured, preconfigured or predefined.

[0196] Optionally, the number of PSFCH time slots is N, and the transceiver unit 1002 is specifically used to send N first signals on the PSFCH time slot, and the N first signals are respectively carried on the N PSFCH time slots.

[0197] Optionally, the number of PSFCH time slots is N, COT includes M PSFCH time slots among the N PSFCH time slots, and the transceiver unit 1002 is specifically used to send M first signals on the PSFCH time slot, and the M first signals are respectively carried on the M PSFCH time slots.

[0198] In a possible implementation, when the terminal device 1000 is used to execute the method executed by the second terminal device in the aforementioned embodiment, the processing unit 1001 and the transceiver unit 1002 included in the terminal device 1000 are used to implement the following process.

[0199] The processing unit 1001 is used to obtain the COT.

[0200] The transceiver unit 1002 is used to send SCI on the first resource, the SCI includes indication information, the indication information is used to indicate the sending of the first signal, the first resource belongs to COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on the second resource.

[0201] Optionally, the first signal is used to occupy the COT.

[0202] Optionally, the second resource corresponds to N PSFCH time slots, and the indication information is used to indicate the sending of N first signals, and the N first signals are respectively carried in the N PSFCH time slots.

[0203] Optionally, the second resource corresponds to N PSFCH time slots, the COT includes M PSFCH time slots among the N PSFCH time slots, and the indication information is used to indicate the sending of M first signals, and the M first signals are respectively carried in the M PSFCH time slots.

[0204] See also Fig.11 , is another schematic diagram of a terminal device 1100 provided in an embodiment of the present application, wherein the terminal device 1100 at least includes an input / output interface 1102. The terminal device 1100 may be a chip or an integrated circuit.

[0205] Optionally, the terminal device 1100 further includes a logic circuit 1101 .

[0206] in, Fig.10 The transceiver unit 1002 shown may be a communication interface, which may be Fig.11 The input / output interface 1102 in the communication interface may include an input interface and an output interface. Alternatively, the communication interface may also be a transceiver circuit, which may include an input interface circuit and an output interface circuit.

[0207] The logic circuit 1101 and the input / output interface 1102 can execute other steps executed by the terminal device in any of the aforementioned embodiments and achieve corresponding beneficial effects, which will not be described in detail here.

[0208] In one possible implementation, Fig.10 The processing unit 1001 shown can be Fig.11 The logic circuit 1101 in.

[0209] Optionally, the logic circuit 1101 may be a processing device, and the functions of the processing device may be partially or completely implemented by software. The functions of the processing device may be partially or completely implemented by software.

[0210] Optionally, the processing device may include a memory and a processor, wherein the memory is used to store a computer program, and the processor reads and executes the computer program stored in the memory to perform corresponding processing and / or steps in any one of the method embodiments.

[0211] Optionally, the processing device may include only a processor. A memory for storing a computer program is located outside the processing device, and the processor is connected to the memory via a circuit / wire to read and execute the computer program stored in the memory. The memory and the processor may be integrated together, or may be physically independent of each other.

[0212] Optionally, the processing device may be one or more chips, or one or more integrated circuits. For example, the processing device may be one or more field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chip (SoC), central processor unit (CPU), network processor (NP), digital signal processor (DSP), microcontroller unit (MCU), programmable logic device (PLD) or other integrated chips, or any combination of the above chips or processors.

[0213] In a possible implementation, the terminal device 1100 can be used to perform the functions involved in the first terminal device in the aforementioned embodiment. The logic circuit 1101 is used to obtain the COT; the input-output interface 1102 is used to receive the SCI on the first resource, the SCI includes indication information, the indication information is used to indicate the sending of the first signal, the first resource belongs to the COT, the SCI is used to schedule the side data, and the side data is carried on the second resource; the logic circuit 1101 is also used to determine the PSFCH time slot based on the second resource; the input-output interface 1102 is also used to send the first signal on the PSFCH time slot

[0214] In a possible implementation, the terminal device 1100 can be used to perform the functions involved in the second terminal device in the aforementioned embodiment. The logic circuit 1101 is used to obtain the COT; the input-output interface 1102 is used to send the SCI on the first resource, the SCI includes indication information, the indication information is used to indicate that the first signal is sent, the first resource belongs to the COT, the SCI is used to schedule the sideline data, and the sideline data is carried on the second resource.

[0215] It should be noted that the information execution process and other contents of the units of the above-mentioned terminal device 1100 can be specifically referred to the description in the method embodiment shown in the above-mentioned application, and will not be repeated here.

[0216] See below Fig.12 , is a possible structural diagram of a terminal device 1200 provided in an embodiment of the present application. The terminal device 1200 may include but is not limited to at least one processor 1201 and a communication port 1202.

[0217] Further optionally, the device may also include at least one of a memory 1203 and a bus 1204 . In an embodiment of the present application, the at least one processor 1201 is used to control and process the actions of the terminal device 1200 .

[0218] In addition, the processor 1201 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0219] It should be noted that Fig.12 The terminal device 1200 shown can be specifically used to implement the steps implemented by the terminal device (such as the first terminal device or the second terminal device) in the aforementioned method embodiment, and achieve the corresponding technical effects of the terminal device. Fig.12 The specific implementation methods of the terminal device shown can all refer to the description in the aforementioned method embodiment, and will not be repeated here.

[0220] An embodiment of the present application further provides a computer-readable storage medium storing one or more computer-executable instructions. When the computer-executable instructions are executed by a processor, the processor executes the method described in the possible implementation manner of the terminal device (e.g., the first terminal device or the second terminal device) in the aforementioned embodiment.

[0221] An embodiment of the present application also provides a computer program product (or computer program) storing one or more computers. When the computer program product is executed by the processor, the processor executes the method of the possible implementation method of the above-mentioned terminal device (such as the first terminal device or the second terminal device).

[0222] The embodiment of the present application also provides a chip system, which includes at least one processor for supporting a terminal device to implement the functions involved in the possible implementation methods of the above-mentioned terminal device. Optionally, the chip system also includes an interface circuit, which provides program instructions and / or data for the at least one processor. In one possible design, the chip system may also include a memory, which is used to store the necessary program instructions and data for the terminal device. The chip system may be composed of a chip, or may include a chip and other discrete devices, wherein the terminal device may specifically be the first terminal device or the second terminal device in the aforementioned method embodiment.

[0223] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0224] In the several embodiments provided in the present 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 schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0225] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0226] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0227] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk and other media that can store program code.

Claims

1. A communication method, characterized in that: include: Get the channel occupation time COT; receiving sidelink control information SCI on a first resource, the SCI including indication information, the indication information being used to indicate sending a first signal, the first resource belonging to the COT, the SCI being used to schedule sidelink data, and the sidelink data being carried on a second resource; Determine a physical sidelink feedback channel PSFCH time slot based on the second resource; The first signal is sent on the PSFCH time slot.

2. The method according to claim 1, characterized in that: The first signal is used to occupy the COT.

3. The method according to claim 1 or 2, characterized in that: The method further comprises: It is determined not to receive feedback information on the PSFCH time slot.

4. The method according to claim 1 or 2, characterized in that: The sending the first signal on the PSFCH time slot includes: When there is no feedback information on the PSFCH time slot, the first signal is sent on the PSFCH time slot.

5. The method according to claim 4, characterized in that The method further comprises: When there is feedback information on the PSFCH time slot, it is determined not to send the first signal on the PSFCH time slot.

6. The method according to claim 1 or 2, characterized in that: The method further comprises: Determine a priority of the first signal and a priority of feedback information, the feedback information being carried in the PSFCH timeslot; The sending the first signal on the PSFCH time slot includes: When the priority of the first signal is higher than the priority of the feedback information, the first signal is sent on the PSFCH time slot.

7. The method according to claim 6, characterized in that The priority of the first signal is the same as the priority of the sideline data.

8. The method according to claim 6, characterized in that The priority of the first signal is network configured, preconfigured or predefined.

9. The method according to any one of claims 1 to 8, characterized in that: The number of the PSFCH time slots is N, and sending the first signal on the PSFCH time slot includes: N first signals are sent on the PSFCH time slot, and the N first signals are respectively carried on the N PSFCH time slots.

10. The method according to any one of claims 1 to 8, characterized in that: The number of the PSFCH time slots is N, the COT includes M PSFCH time slots among the N PSFCH time slots, and sending the first signal on the PSFCH time slot includes: M first signals are sent on the PSFCH time slot, and the M first signals are respectively carried on the M PSFCH time slots.

11. A communication method, characterized in that: include: Get the channel occupation time COT; Sidelink control information SCI is sent on a first resource, the SCI includes indication information, the indication information is used to indicate sending a first signal, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource.

12. The method according to claim 11, characterized in that The first signal is used to occupy the COT.

13. The method according to claim 11 or 12, characterized in that: The second resource corresponds to N PSFCH time slots, and the indication information is used to indicate sending N first signals, and the N first signals are respectively carried in the N PSFCH time slots.

14. The method according to claim 11 or 12, characterized in that: The second resource corresponds to N PSFCH time slots, the COT includes M PSFCH time slots among the N PSFCH time slots, and the indication information is used to indicate the sending of M first signals, and the M first signals are respectively carried in the M PSFCH time slots.

15. A terminal device, characterized in that: including a transceiver unit and a processing unit; The processing unit is used to obtain the channel occupation time COT; The transceiver unit is used to receive sidelink control information SCI on a first resource, the SCI includes indication information, the indication information is used to indicate sending a first signal, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource; The processing unit is further configured to determine a physical sidelink feedback channel PSFCH time slot based on the second resource; The transceiver unit is further configured to send the first signal on the PSFCH timeslot.

16. The device according to claim 15, characterized in that The first signal is used to occupy the COT.

17. The device according to claim 15 or 16, characterized in that The processing unit is further configured to determine not to receive feedback information on the PSFCH time slot.

18. The device according to claim 15 or 16, characterized in that The transceiver unit is specifically used for: When there is no feedback information on the PSFCH time slot, sending the first signal on the PSFCH time slot.

19. The device according to claim 18, characterized in that The processing unit is also used for: When there is feedback information on the PSFCH time slot, it is determined not to send the first signal on the PSFCH time slot.

20. The device according to claim 15 or 16, characterized in that The processing unit is further used to determine the priority of the first signal and the priority of feedback information, and the feedback information is carried in the PSFCH time slot; The transceiver unit is specifically configured to: send the first signal on the PSFCH timeslot when the priority of the first signal is higher than the priority of the feedback information.

21. The device according to claim 20, characterized in that The priority of the first signal is the same as the priority of the sideline data.

22. The device according to claim 20, characterized in that The priority of the first signal is network configured, preconfigured or predefined.

23. The device according to any one of claims 15 to 22, characterized in that The number of the PSFCH time slots is N, and the transceiver unit is specifically used for: N first signals are sent on the PSFCH time slot, and the N first signals are respectively carried on the N PSFCH time slots.

24. The device according to any one of claims 15 to 22, characterized in that The number of the PSFCH time slots is N, the COT includes M PSFCH time slots among the N PSFCH time slots, and the transceiver unit is specifically used for: M first signals are sent on the PSFCH time slot, and the M first signals are respectively carried on the M PSFCH time slots.

25. A terminal device, characterized in that: including a transceiver unit and a processing unit; The processing unit is used to obtain the channel occupation time COT; The transceiver unit is used to send sidelink control information SCI on a first resource, the SCI includes indication information, the indication information is used to indicate sending a first signal, the first resource belongs to the COT, the SCI is used to schedule sidelink data, and the sidelink data is carried on a second resource.

26. The device according to claim 25, characterized in that The first signal is used to occupy the COT.

27. A terminal device, characterized in that: comprising at least one processor coupled to a memory; The memory is used to store programs or instructions; The at least one processor is configured to execute the program or instruction so that the terminal device implements the method according to any one of claims 1 to 10, or so that the terminal device implements the method according to any one of claims 11 to 14.

28. A computer-readable storage medium, characterized in that: The medium stores instructions, and when the instructions are executed by a computer, the method according to any one of claims 1 to 14 is implemented.

29. A computer program product, characterized in that The method comprises instructions which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 14.

30. A chip, characterized in that: The chip includes a processor and a communication interface; The communication interface is coupled to the processor, and the processor is used to run a computer program or instruction to implement the method as claimed in any one of claims 1 to 14.

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