CN115604825A

CN115604825A - Sideline communication method and device

Info

Publication number: CN115604825A
Application number: CN202110721403.5A
Authority: CN
Inventors: 焦春旭; 张佳胤; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2023-01-13
Also published as: WO2023273743A1

Abstract

The application provides a sidestream communication method and device, which are used for improving the resource utilization efficiency of sidestream transmission communication in an unlicensed spectrum. The method comprises the following steps: receiving indication information, wherein the indication information indicates that: the parameter of the second terminal device during Listen Before Talk (LBT) and the parameter of the frequency domain resource actually used by the second terminal device in a first Channel Occupancy Time (COT), wherein the first COT is used for the communication between the second terminal device and a third terminal device; and occupying a second COT based on the parameters when the second terminal device performs LBT, wherein the frequency domain resources used by the first terminal device in the second COT are the frequency domain resources which are not used by the second terminal device in the first COT, and the second COT is used for the communication between the first terminal device and a fourth terminal device. Through the above manner, the first terminal device can communicate with the fourth terminal device by using the resource occupied by the second terminal device but not used, so that the resource utilization rate can be improved.

Description

Sideline communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a sideline communication method and apparatus.

Background

Sidelink (SL) communications enabling unlicensed spectrum in local space is an important direction of evolution. Similar to a normal user (Uu) interface, a terminal device communicating over SL in an unlicensed spectrum also needs to coexist with a nearby wireless fidelity (Wi-Fi) device based on a listen-before-talk (LBT) mechanism.

In SL-U communication, a terminal device needs to listen to whether a channel is idle (idle) before accessing the channel and starting to send data, and may occupy the channel if the channel has been idle for a certain time, or may occupy the channel after waiting for the channel to recover to idle if the channel is not idle. However, if the resource occupation of the unlicensed spectrum is performed only according to the LBT mechanism, the number of terminal devices communicating using the unlicensed spectrum at the same time is severely limited, and the system throughput is low.

Disclosure of Invention

The application provides a sideline communication method and a device, which are used for improving the resource utilization efficiency of SL-U communication.

In a first aspect, the present application provides a sideline communication method, where an execution subject of the method may be a terminal device, or may be a chip or a circuit. The method comprises the following steps: receiving indication information from the second terminal equipment, wherein the indication information indicates that: the parameter of the second terminal device during LBT and the parameter of the first frequency domain resource used by the second terminal device belong to the frequency domain resource corresponding to the first COT, and the first COT is used for the communication between the second terminal device and the third terminal device; and occupying a second COT based on the parameter when the second terminal device performs LBT, wherein a second frequency domain resource used by the first terminal device in the second COT belongs to the frequency domain resource corresponding to the first COT, the second frequency domain resource is not overlapped with the first frequency domain resource, and the second COT is used for the communication between the first terminal device and a fourth terminal device.

When the second terminal device has successfully initiated the first COT based on the LBT mechanism, the channel will be in a non-idle state in the first COT, and if the first terminal device performs LBT after the second terminal device initiates the first COT, it will probably sense that the channel is in the non-idle state, resulting in that it cannot perform SL transmission. In the embodiment of the application, the indication information indicates the parameter of the second terminal device during LBT, so that the first terminal device and the second terminal device can jointly access the channel at the same time point, and thus, the problem that one terminal device fails to compete due to the fact that another terminal device fails to perform LBT in advance can be avoided. And, by the frequency domain information indicated by the indication information, the frequency domain resource used by the first terminal device during occupying the channel and the frequency domain resource used by the second terminal device during occupying the channel may not overlap, thereby avoiding resource conflict. By the method, frequency division multiplexing among different terminal devices can be realized, so that the resource use efficiency of the SL-U system can be improved, and the communication time delay can be reduced.

In one possible design, the indication information may further indicate: a parameter associated with the first COT. Thus, the method may further comprise: and determining the relevant parameters of the second COT according to the relevant parameters of the first COT. Through the design, resource conflict can be better avoided.

In one possible design, the related parameter of the first COT includes a bandwidth corresponding to the first COT. The relevant parameter of the second COT includes a bandwidth corresponding to the second COT, where the bandwidth corresponding to the second COT is within the bandwidth corresponding to the first COT. Through the design, resource conflict between the first terminal device and other terminal devices can be avoided.

In one possible design, the relevant parameter of the first COT includes a slot allocation structure of the first COT; the relevant parameters of the second COT include time domain resources corresponding to the second COT, where the time domain resources corresponding to the second COT are in a first class of time domain resources corresponding to the first COT, and the first class of time domain resources are used for the second terminal device to transmit the sideline data. Through the design, the conflict of the sending resources of the first terminal equipment and the second terminal equipment can be avoided.

In one possible design, the relevant parameter of the first COT includes a slot allocation structure of the first COT; the related parameters of the second COT include a timeslot configuration structure of the second COT, where the timeslot configuration structure of the second COT may be the same as the timeslot configuration structure of the first COT. Through the design, the conflict of the sending resources of the first terminal equipment and the second terminal equipment can be avoided.

In a possible design, in the second COT, frequency domain resources used by the first terminal device to transmit data to the fourth terminal device may be the same as frequency domain resources used by the first terminal device to receive data transmitted by the fourth terminal device. With the above design, when the timeslot configuration structure of the second COT includes a timeslot for the first terminal device to transmit to the fourth terminal device and a timeslot for the fourth terminal device to transmit to the first terminal device, it may be ensured that frequency domain resources used by the fourth terminal device in the second COT are orthogonal (non-overlapping) to frequency domain resources used by the second terminal device in the first COT.

In one possible design, the parameter for the second terminal device to perform LBT includes at least one of the following: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the counter value of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT. Through the design, the first terminal device and the second terminal device can align LBT more accurately, and the accuracy of FDM is improved.

In one possible design, prior to receiving the indication information from the second terminal device, the method further includes: sending a request message to a second terminal device, wherein the request message is used for requesting to share the frequency domain resource corresponding to the first COT; and receiving a response message from the second terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT.

The design can break the limitation that the terminal devices which only belong to the same communication pair can coordinate with each other at present, through the process, access network devices or terminal devices with a centralized scheduling function do not need to exist in a network, only simple signaling interaction is needed among the terminal devices, and the unlicensed spectrum can be shared after the signaling interaction is completed. Compared with direct scheduling of resources, the method can reduce the interactive overhead of the scheduling signaling and further improve the resource utilization efficiency of the unlicensed spectrum.

In one possible design, the request message carries at least one of: a first parameter and a second parameter. The first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal equipment. Through the design, the second terminal device can determine whether to allow the first terminal device and the second terminal device to share the resources of the unlicensed spectrum according to the first parameter and the second parameter.

In one possible design, the response message carries at least one of: a third parameter and a fourth parameter. Wherein the third parameter is used for indicating the position of the second frequency domain resource, and the fourth parameter is used for indicating the position of the bandwidth of the first terminal equipment. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In one possible design, the third parameter indicates a number of a first interleaved resource block in the second frequency domain resources among remaining interleaved resource blocks, the remaining interleaved resource blocks including interleaved resource blocks in the frequency domain resources corresponding to the first COT except for the first frequency domain resources. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In one possible design, the fourth parameter indicates an offset value of a bandwidth of the first terminal device relative to a bandwidth of the second terminal device. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In a second aspect, the present application provides a sideline communication method, where an execution subject of the method may be a terminal device, or may be a chip or a circuit. The method comprises the following steps: determining indication information and sending the indication information to a first terminal device, wherein the indication information is used for indicating the first terminal device and a second terminal device to share a frequency domain resource corresponding to a first COT, the first COT is used for communication between the second terminal device and a third terminal device, and the indication information indicates that: the parameter of the second terminal device when performing listen before talk LBT, and the parameter of the first frequency domain resource used by the second terminal device, where the first frequency domain resource belongs to the frequency domain resource corresponding to the first COT.

When the second terminal device has successfully initiated the first COT based on the LBT mechanism, the channel will be in a non-idle state in the first COT, and if the first terminal device performs LBT after the second terminal device initiates the first COT, it will probably sense that the channel is in the non-idle state, resulting in that it cannot perform SL transmission. In the embodiment of the application, the indication information indicates the parameter of the second terminal device during LBT, so that the first terminal device and the second terminal device can access the channel together at the same time point, and thus, the problem that one terminal device fails to compete due to the fact that another terminal device fails to perform LBT in advance can be avoided. And, by the frequency domain information indicated by the indication information, the frequency domain resources used by the first terminal device during occupying the channel and the frequency domain resources used by the second terminal device during occupying the channel may not overlap, thereby avoiding resource conflict. By the method, frequency division multiplexing among different terminal devices can be realized, so that the resource use efficiency of the SL-U system can be improved, and the communication time delay can be reduced.

In one possible design, the indication information may further indicate: a parameter associated with the first COT. Through the design, the first terminal device can determine the relevant parameters of the second COT according to the relevant parameters of the first COT, so that resource conflict can be better avoided.

In one possible design, the relevant parameter of the first COT includes a bandwidth corresponding to the first COT. Through the design, the first terminal device can configure the bandwidth corresponding to the second COT, so that the first terminal device can be prevented from colliding with other terminal devices.

In one possible design, the relevant parameter of the first COT includes a slot allocation structure of the first COT. Through the design, the first terminal device may configure the time domain resource corresponding to the second COT or the timeslot matching structure of the second COT, so that a resource collision between the first terminal device and the second terminal device may be avoided.

In one possible design, within the first COT, frequency domain resources used by the second terminal device to transmit data to the third terminal device may be the same as frequency domain resources used by the second terminal device to receive data transmitted by the third terminal device. With the above design, when the timeslot configuration structure of the first COT includes a timeslot for the second terminal device to transmit to the third terminal device and a timeslot for the third terminal device to transmit to the second terminal device, it can be ensured that frequency domain resources used by the third terminal device in the first COT are orthogonal (non-overlapping) to frequency domain resources used by the first terminal device in the second COT.

In one possible design, the parameter for the second terminal device to perform LBT includes at least one of the following: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the value of a counter of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT. Through the design, the first terminal device and the second terminal device can align LBT more accurately, and the accuracy of FDM is improved.

In one possible design, before sending the indication information to the first terminal device, the method further includes: receiving a request message from a first terminal device, wherein the request message is used for requesting to share a frequency domain resource corresponding to a first COT; determining that the first terminal device is allowed to share frequency domain resources corresponding to the first COT; and sending a response message to the first terminal device, wherein the response message is used for indicating that the first terminal device is allowed to share the frequency domain resources corresponding to the first COT.

In one possible design, the request message carries at least one of: a first parameter and a second parameter. The first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal equipment. When determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT, determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT according to the first parameter and the number of interleaved resource blocks included in the first frequency domain resource; and/or determining to allow the first terminal device to share the frequency domain resource corresponding to the first COT according to the second parameter and the size of the bandwidth of the second terminal device. Through the design, the second terminal device can determine whether to allow the first terminal device and the second terminal device to share the resources of the unlicensed spectrum according to the first parameter and the second parameter.

In one possible design, the response message carries at least one of: a third parameter and a fourth parameter. The third parameter is used for indicating the position of the second frequency domain resource, and the fourth parameter is used for indicating the position of the bandwidth of the first terminal device. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In a third aspect, the present application provides a sideline communication method, where an execution subject of the method may be a terminal device, or may be a chip or a circuit. The method comprises the following steps: sending a request message to a second terminal device, wherein the request message is used for requesting to share a frequency domain resource corresponding to a first COT, and the first COT is used for the communication between the second terminal device and a third terminal device; and receiving a response message from the second terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resources corresponding to the first COT.

In one possible design, the request message carries at least one of: a first parameter and a second parameter. The first parameter is used to indicate the number of interleaved resource blocks included in a second frequency domain resource used by the first terminal device within a second COT, the second parameter is used to indicate the size of the bandwidth of the first terminal device, and the second COT is used for the first terminal device and a fourth terminal device to communicate with each other. Through the design, the second terminal device can determine whether to allow the first terminal device and the second terminal device to share the resources of the unlicensed spectrum according to the first parameter and the second parameter.

In one possible design, the response message carries at least one of: a third parameter and a fourth parameter. The third parameter is used for indicating a position of a second frequency domain resource, the fourth parameter is used for indicating a position of a bandwidth of the first terminal device, the position of the second frequency domain resource is in a frequency domain resource corresponding to the first COT, the second frequency domain resource is not overlapped with a first frequency domain resource used by the second terminal device, and the first frequency domain resource belongs to a frequency domain resource corresponding to the first COT. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In a fourth aspect, the present application provides a sideline communication method, where an execution subject of the method may be a terminal device, or may be a chip or a circuit. The method comprises the following steps: receiving a request message from a first terminal device, wherein the request message is used for requesting to share a frequency domain resource corresponding to a first COT, and the first COT is used for communication between a second terminal device and a third terminal device; determining that the first terminal device is allowed to share frequency domain resources corresponding to the first COT; and sending a response message to the first terminal device, wherein the response message is used for indicating that the first terminal device is allowed to share the frequency domain resources corresponding to the first COT.

The design can break the limitation that the terminal devices which only belong to the same communication pair can coordinate with each other at present, through the process, access network devices or terminal devices with a centralized scheduling function do not need to exist in a network, only simple signaling interaction is needed among the terminal devices, and the unlicensed spectrum can be shared after the signaling interaction is completed. Compared with direct scheduling of resources, the method can reduce the interaction overhead of scheduling signaling and further improve the resource utilization efficiency of the unlicensed spectrum.

In one possible design, the request message carries at least one of: a first parameter and a second parameter. The first parameter is used to indicate the number of interleaved resource blocks included in a second frequency domain resource used by the first terminal device in a second COT, the second parameter is used to indicate the size of the bandwidth of the first terminal device, and the second COT is used for the first terminal device and a fourth terminal device to communicate with each other. When determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT, determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT according to the first parameter and the number of staggered resource blocks included in the first frequency domain resource used by the second terminal device; and/or determining to allow the first terminal device to share the frequency domain resource corresponding to the first COT according to the second parameter and the size of the bandwidth of the second terminal device, where the first frequency domain resource belongs to the frequency domain resource corresponding to the first COT.

Through the design, the second terminal device can determine whether to allow the first terminal device and the second terminal device to share the resource of the unlicensed spectrum according to the first parameter and the second parameter.

In one possible design, the response message carries at least one of: a third parameter and a fourth parameter. The third parameter is used to indicate a position of the second frequency domain resource, the fourth parameter is used to indicate a position of the bandwidth of the first terminal device, the position of the second frequency domain resource is within the frequency domain resource corresponding to the first COT, and the second frequency domain resource is not overlapped with the first frequency domain resource used by the second terminal device. Through the design, the first terminal device can determine the position of the frequency domain resource used by the first terminal device.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, which may implement the method implemented by the first terminal device in the first aspect or any possible design thereof, or the third aspect or any possible design thereof. The apparatus comprises corresponding units or means for performing the above-described method. The means comprising may be implemented by software and/or hardware means. The apparatus may be, for example, the first terminal device, or a component or a baseband chip, a chip system, or a processor that may support the method implemented in the first terminal device.

Illustratively, the communication device may comprise a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), which may perform the corresponding functions of the first terminal device in the first aspect or any possible design thereof, or in the third aspect or any possible design thereof. When the communication apparatus is a first terminal device, the transceiving unit may be a transmitter and a receiver, or a transceiver obtained by integrating a transmitter and a receiver. The transceiver unit may include an antenna, a radio frequency circuit, and the like, and the processing unit may be a processor, such as a baseband chip and the like. When the communication device is a component having the above-mentioned function of the first terminal equipment, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiving unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: a Central Processing Unit (CPU).

The transceiving unit may be adapted to perform the actions of receiving and/or transmitting performed by the first terminal device in the first aspect or any possible design thereof, or in the third aspect or any possible design thereof. The processing unit may be configured to perform actions other than the receiving and sending performed by the first terminal device in the first aspect or any possible design thereof, or in the third aspect or any possible design thereof, such as occupying the second COT based on parameters when the second terminal device performs LBT, and so on.

In a sixth aspect, an embodiment of the present application provides a communication apparatus, which may implement the method implemented by the second terminal device in the second aspect or any possible design thereof, or the fourth aspect or any possible design thereof. The device comprises corresponding units or means for performing the above-described method. The means comprising may be implemented by software and/or hardware means. The apparatus may be, for example, the second terminal device, or a component or a baseband chip, a system-on-chip, or a processor that may support the implementation of the method in the second terminal device.

Illustratively, the communication device may comprise a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), etc., which may perform the corresponding functions of the second terminal device in the above second aspect or any possible design thereof, or in the fourth aspect or any possible design thereof. When the communication apparatus is a second terminal device, the transceiving unit may be a transmitter and a receiver, or a transceiver obtained by integrating the transmitter and the receiver. The transceiver unit may include an antenna, a radio frequency circuit, and the like, and the processing unit may be a processor, such as a baseband chip and the like. When the communication device is a component having the functions of the second terminal equipment, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor. When the communication device is a chip system, the transceiving unit may be an input/output interface of the chip system, and the processing unit may be a processor of the chip system, for example: a Central Processing Unit (CPU).

The transceiving unit may be adapted to perform the actions of receiving and/or transmitting performed by the second terminal device in the second aspect or any possible design thereof, or the fourth aspect or any possible design thereof. The processing unit may be configured to perform actions other than the receiving and sending performed by the second terminal device in the second aspect or any possible design thereof, or in the fourth aspect or any possible design thereof, such as determining the indication information, determining to allow the first terminal device to share the frequency domain resources corresponding to the first COT, and so on.

In a seventh aspect, a communication system is provided, which includes the communication apparatus shown in the fifth aspect and the sixth aspect.

In an eighth aspect, there is provided a computer readable storage medium for storing computer instructions which, when executed on a computer, cause the computer to perform the method as set forth in any one of the first to fourth aspects or any one of its possible implementations.

In a ninth aspect, there is provided a computer program product comprising instructions for storing computer instructions which, when run on a computer, cause the computer to perform the method as shown in any one of the first to fourth aspects above or any one of its possible implementations.

In a tenth aspect, there is provided a circuit, coupled to a memory, for performing the method of any one of the first to fourth aspects or any one of its possible implementations. The circuit may comprise a chip circuit.

Drawings

Fig. 1 is a schematic view of a V2X communication scenario provided in an embodiment of the present application;

fig. 2 is a schematic view of a SL-U communication scenario provided in an embodiment of the present application;

fig. 3 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a timeslot matching structure of a first COT according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram illustrating an LBT time indication according to an embodiment of the present application;

FIG. 6 is a schematic diagram of another example of indicating LBT time according to the present application;

fig. 7 is a schematic diagram of a coordination process provided in an embodiment of the present application;

fig. 8 is a schematic diagram of FDM provided in an embodiment of the present application;

fig. 9 is a schematic diagram of request sharing according to an embodiment of the present application;

FIG. 10 is a schematic diagram of response sharing provided by an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including equipment providing voice and/or data connectivity to a user, in particular, including equipment providing voice to a user, or including equipment providing data connectivity to a user, or including equipment providing voice and data connectivity to a user. For example, may include a handheld device having wireless connection capability, or a processing device connected to a wireless modem. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchange voice or data with the RAN, or interact with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a device-to-device communication (D2D) terminal device, a vehicle-to-all (V2X) terminal device, a machine-to-machine/machine-type communication (M2M/MTC) terminal device, an internet of things (IoT) terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point, AP), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), or a user equipment (user), etc. For example, mobile telephones (otherwise known as "cellular" telephones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included mobile devices, and the like may be included. Such as Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, personal Digital Assistants (PDAs), and the like. Also included are constrained devices such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, radio Frequency Identification (RFID), sensors, global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device has full functions and large size, and can realize complete or partial functions without depending on a smart phone, for example: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in a vehicle, may be considered as vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs), for example.

In this embodiment, the terminal device may further include a relay (relay). Or, it is understood that any device capable of data communication with a base station may be considered a terminal device.

In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system, and the apparatus may be installed in the terminal device. In the embodiment of the present application, the chip system may be formed by a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is taken as an example of a terminal device, and the technical solution provided in the embodiment of the present application is described.

2) A network device, for example, including AN Access Network (AN) device, such as a base station (e.g., AN access point), may refer to a device in AN access network that communicates with a wireless terminal device over one or more cells over AN air interface, or a network device in a V2X technology is a Road Side Unit (RSU), for example. The base station may be configured to interconvert the received air frame with an Internet Protocol (IP) packet, and serve as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU may be a fixed infrastructure entity supporting V2X applications, and may exchange messages with other entities supporting V2X applications. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved 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 also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5 g) NR system (also referred to as NR system) or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a Cloud access network (Cloud RAN) system, which is not limited in the embodiments of the present application.

The network device may also include a core network device including, for example, an access and mobility management function (AMF), etc. Since the embodiments of the present application mainly relate to an access network, unless otherwise specified, all the network devices refer to access network devices.

In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.

3) V2X is the interconnection and intercommunication between the vehicle and the outside, which is the basic and key technology of future intelligent vehicles, automatic driving and intelligent transportation systems. As shown in fig. 1, the V2X specifically includes several application requirements, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication interaction. V2V refers to inter-vehicle communication; V2P refers to vehicle-to-person communication (including pedestrians, cyclists, drivers, or passengers); V2I refers to vehicle to network device communication, such as RSU, and another V2N may be included in V2I, V2N refers to vehicle to base station/network communication.

4) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a alone, A and B together, and B alone, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the size, content, sequence, timing, priority, degree of importance, etc., of the plurality of objects. For example, the first parameter and the second parameter are only used for distinguishing different parameters, and do not indicate the difference of the contents, priorities, importance levels, and the like of the two parameters.

The foregoing describes some of the noun concepts related to embodiments of the present application, and the following describes some features related to embodiments of the present application.

In the 4G LTE system, cellular mobile communication standardizes an unlicensed spectrum, so that the LTE system can coexist with Wi-Fi equipment based on an LBT mechanism, and LTE Uu interface communication on the unlicensed spectrum is enabled. In the new generation of 5G NR system, the NR Uu interface communication in the unlicensed spectrum is further enhanced, and related protocol technologies are collectively called NR-U. In addition, there is a PC5 interface in addition to the Uu interface described above, which is a communication interface between the UE and the UE. The transmission link in the PC5 interface is defined as SL. SL communication enabling unlicensed spectrum in local space is an important direction of evolution, and the corresponding protocol technologies may be collectively referred to as SL-U. Similar to the Uu interface, a UE operating over SL-U also needs to co-exist with nearby Wi-Fi devices based on LBT mechanisms.

The nature of the LBT mechanism is a channel access rule. The UE needs to sense whether the channel is idle (idle) before accessing the channel and starting to send data, and may occupy the channel if the channel has been idle for a certain time, or may occupy the channel after waiting for the channel to recover to idle again if the channel is not idle. However, if the resource occupation of the unlicensed spectrum is performed only according to the LBT mechanism, a certain network device or UE may not access the channel because the channel is not in the idle state after its neighboring devices have preemptively accessed the channel. This results in a severely limited number of devices communicating using the unlicensed spectrum at the same time and a low system throughput. Therefore, how to improve the resource utilization efficiency of the wireless communication system in the unlicensed spectrum on the basis of the LBT mechanism becomes a very important technical problem.

Frequency Division Multiplexing (FDM) is one of the important paths for improving the resource utilization efficiency. The devices in the system suppress mutual interference by using orthogonal frequency domain resources, so that more devices in the system can access a channel simultaneously, and the resource utilization efficiency of the unlicensed spectrum is improved. However, the SL-U system is a distributed system, and there may be a plurality of communication pairs formed by a plurality of transmitting UEs and a plurality of receiving UEs. At this time, if multiple sending-end UEs attempt to access the unlicensed spectrum based on respective LBT mechanisms, it may be that one of the sending-end UEs has already started signal transmission, so that other sending-end UEs cannot access the channel due to LBT failure. Therefore, it is difficult to implement FDM between multiple sending UEs in the SL-U system based on the existing method, which creates a technical demand for a new method for enabling FDM.

Based on this, the embodiment of the application provides a sideline communication method and device. In the embodiment of the application, the UE belonging to different communication pairs can be coordinated, so that the UE can reasonably allocate frequency domain resources which are occupied when the UE is accessed to channels, thereby avoiding mutual interference and improving the resource utilization efficiency of the unlicensed spectrum. And, the UE may align the LBT procedure according to the indication information of another UE, so that the channel may be accessed in the same time domain resource. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The embodiment of the application can be applied to SL-U scenes. Fig. 2 shows a schematic view of a scenario applied in an embodiment of the present application. The scene comprises a sending end UE1, a sending end UE3, a receiving end UE2 and a receiving end UE4. The sending end UE1 and the receiving end UE2 are a communication pair, and the sending end UE1 transmits data to the receiving end UE2 through SL-U; the sending end UE3 and the receiving end UE4 are another communication pair, and the sending end UE3 transmits data to the receiving end UE4 through SL-U. It should be noted that the receiving end UE2 and the receiving end UE4 may also transmit data to the transmitting end UE1 and the transmitting end UE3 through SL-U, respectively.

In this scenario, a communication pair formed by the sending end UE3 and the receiving end UE4 is a main communication pair in the SL-U system, and the sending end UE3 and the receiving end UE4 may be respectively described as a second terminal device and a third terminal device, optionally, the priority of the communication service between the UE3 and the UE4 is higher, or the priority of the UE3 itself is higher, and the like, so the communication pair formed by the UE3 and the UE4 may be the main communication pair in the SL-U system. In a scenario, a communication pair formed by the sending end UE1 and the receiving end UE2 is a communication pair in the SL-U system that wants to share the unlicensed spectrum resource with the main communication pair in the FDM manner, and the sending end UE1 and the receiving end UE2 may be described as a first terminal device and a fourth terminal device, respectively. In fig. 1, a mobile phone is taken as an example of the sending end UE3, a Head Mounted Display (HMD) is taken as an example of the receiving end UE4, a smart watch is taken as an example of the sending end UE1, and a tablet computer is taken as an example of the receiving end UE 2. It should be noted that, in an actual application scenario, a plurality of communication pairs may be included, such as 3 communication pairs and 7 communication peers, one terminal device may form different communication pairs with a plurality of terminal devices, and each sending-end UE and each receiving-end UE may be terminal devices in any form in the actual application scenario.

It can be understood that the transmitting end and the receiving end may be replaced with each other, that is, one UE may serve as both the transmitting end and the receiving end, for example, taking a communication pair consisting of UE3 and UE4 as an example, when UE3 transmits data, signaling, and the like to UE4, UE3 serves as the transmitting end, UE4 serves as the receiving end, UE4 transmits data, signaling, and the like to UE3, UE4 serves as the transmitting end, and UE3 serves as the receiving end. Taking a communication pair composed of UE1 and UE2 as an example, when UE1 transmits data, signaling, and the like to UE2, UE1 serves as a transmitting side and UE2 serves as a receiving side, when UE2 transmits data, signaling, and the like to UE1, UE2 serves as a transmitting side and UE1 serves as a receiving side. Fig. 1 only illustrates UE3 as a transmitting end, UE4 as a receiving end, UE1 as a transmitting end, and UE2 as a receiving end, and the transmission direction is not limited.

The following describes a technical solution provided by an embodiment of the present application with reference to a scenario shown in fig. 1. Referring to fig. 3, a schematic flow chart of a sideline communication method provided by the present application is shown. The method comprises the following steps:

s301, the UE3 determines the indication information.

The indication information is used to indicate that the UE3 and the UE1 share a frequency domain resource corresponding to a first COT, and the first COT is used for the UE3 and the UE4 to communicate. Specifically, the indication information may indicate a parameter for UE3 to initiate (initial)/initiate the first COT, for example, the indication information may indicate: parameters when the UE3 performs LBT, so that the UE1 can perform LBT according to the parameters, so that the UE1 and the UE3 can access the channel together at the same time point/time period. In addition, the indication information may also indicate the frequency domain resources actually used by the UE3 in the first COT, for example, the indication information may indicate: the parameter of the first frequency domain resource used by the UE3 belongs to the frequency domain resource corresponding to the first COT, so that the UE1 may determine, according to the indication information, the resource that is not used by the UE3 in the frequency domain resource corresponding to the first COT.

It should be noted that the indication information is used to indicate that the UE3 and the UE1 share the frequency domain resource corresponding to the first COT, and indicate that the UE3 and the UE1 can make the UE1 have an opportunity to share the frequency domain resource corresponding to the first COT to be initiated/initiated by the UE3 by sending and receiving the indication information, so that the UE3 and the UE1 share the unlicensed spectrum in the FDM manner.

It should be further noted that step S301 may be an optional step.

It should be understood that the process of initiating/initiating the COT may refer to a process in which the UE accesses the unlicensed spectrum channel according to the LBT mechanism and occupies the channel for a period of time according to a specific parameter, where the COT may be understood as a period of time-frequency resources occupied by the terminal device through the LBT mechanism, a frequency-domain resource corresponding to the COT is the unlicensed spectrum channel, and a time-domain resource corresponding to the COT is time for the terminal device to occupy the unlicensed spectrum channel through the LBT mechanism. The specific parameter may include a parameter related to the COT, such as a duration of the COT, a slot allocation structure of the COT, and the like. The timeslot configuration structure may be used to characterize a timeslot used for terminal device transmission and a specific configuration of a timeslot used for terminal device reception in the COT. For example, taking the first COT as an example, as shown in FIG. 4, the first COT includes 10 slots with the numbers {0,1,2, \8230;, 9}. Wherein the time slots numbered 0,1,2,3 and the time slots numbered 8,9 are used for transmission by the UE3, and are characterized by "T" in the figure; the time slot numbered 4,5,6,7 is used for reception by UE3, and is characterized by an "R" in the figure. It should be understood that the time slot for transmission by UE3 will be used for reception by UE 4; correspondingly, the time slot for reception of UE3 will be used for transmission of UE4.

It should also be understood that the frequency domain resource corresponding to the first COT is all or part of a Resource Block (RB) of the bandwidth of the UE 3. The bandwidth of the UE3 refers to the width of a channel of the unlicensed spectrum occupied by the UE3, such as 20MHz, 40MHz, 80MHz, and the like. The first frequency domain resource used by the UE3 may be a part of RBs in the frequency domain resource corresponding to the first COT, and since the frequency domain resource corresponding to the first COT is all or part of RBs in the bandwidth of the UE3, it can be understood that the first frequency domain resource used by the UE3 is also a part of RBs in the bandwidth of the UE 3.

Hereinafter, the frequency domain resource corresponding to the second COT is all or a part of RBs of the bandwidth of the UE 1. The bandwidth of UE1 refers to the width of the channel of the unlicensed spectrum occupied by UE1, such as 20MHz, 40MHz, 80MHz, and so on. The second frequency domain resource used by UE1 may be a partial RB in the frequency domain resource corresponding to the second COT, and since the frequency domain resource corresponding to the second COT is all or a partial RB of the bandwidth of UE1, it can be understood that the second frequency domain resource used by UE1 is a partial RB in the bandwidth of UE 1.

The bandwidth may also be referred to as a Nominal Channel Bandwidth (NCB).

S302, UE3 sends indication information to UE 1. Accordingly, the UE1 receives the indication information sent by the UE 3.

In one implementation, the indication information may be carried by sidelink (sidelink) control information (SCI) and/or Radio Resource Control (RRC) signaling, but the indication information may also be carried by other signaling, which is not limited herein.

It should be understood that, SL data transmission is performed between UE3 and UE4, and SL data transmission is not performed between UE3 and UE1, however, since the unlicensed spectrum is a shared spectrum, the indication information sent by UE3 may be received by UE1, and then UE1 may perform operations such as LBT channel access according to the indication information.

S303, UE1 occupies the second COT based on the parameter of UE3 during LBT.

The second frequency domain resource used by UE1 in the second COT belongs to the frequency domain resource corresponding to the first COT, and the second frequency domain resource is not overlapped with the first frequency domain resource, and the second COT is used for UE1 and UE2 to communicate, so that UE3 and UE1 can share the frequency domain resource corresponding to the first COT in an FDM manner. That is, the second frequency domain resource belongs to a part of the resource occupied by the UE3, which is not actually used by the UE3, in the resource of the first COT, so that the UE1 and the UE3 can share the resource corresponding to the first COT, and thus the UE1 can use the resource corresponding to the UE3, and further the resource utilization rate can be effectively improved.

Through step S303, UE1 may determine a parameter for initiating/initiating the second COT according to the indication information sent by UE3, specifically, UE1 may perform LBT according to the parameter when UE3 performs LBT to access the unlicensed spectrum channel and occupy the channel for a period of time (i.e., the second COT), where frequency domain resources used by UE1 during occupying the second COT (i.e., the second frequency domain resources) are not overlapped with frequency domain resources used by UE3 during occupying the first COT (i.e., the first frequency domain resources).

When the UE3 has successfully initiated/initiated the first COT based on the LBT mechanism, the channel will be in a non-idle state within the first COT, and if the UE1 performs the LBT after the UE3 initiates/initiates the first COT, it will probably sense that the channel is in the non-idle state, resulting in that it cannot perform SL transmission. In the embodiment of the application, the indication information indicates the parameters of the UE3 during LBT, so that the UE1 and the UE3 can jointly access the channel at the same time point/time period, thereby avoiding contention failure of one terminal device due to early LBT of another terminal device. And, by the frequency domain information indicated by the indication information, the frequency domain resources used by the UE1 during occupying the channel and the frequency domain resources used by the UE3 during occupying the channel may not overlap, thereby avoiding resource collision. By the method, FDM among different terminal devices can be realized, so that the resource use efficiency of the SL-U system can be improved, and the communication time delay can be reduced.

The following describes a procedure for aligning LBT between UE1 and UE3 with reference to an exemplary description of the indication information.

First, a parameter when the UE3 indicated by the indication information performs LBT will be described as an example. Illustratively, the parameters when the UE3 performs LBT may include at least one of: the starting time of LBT performed by UE3, the size of a contention window for LBT performed by UE3, the counter value for random backoff performed by UE3, and the priority of LBT performed by UE 3.

If the parameters of the UE3 during LBT include the starting time T of the UE3 during LBT _LBT Specifically, the UE1 configures the starting time point of the second COT to be the same as the starting time point of the first COT, so that the UE1 and the UE3 may access the unlicensed spectrum channel at the same time point.

In one example, the indication information may indicate the time parameter t _offset ，t _offset End time point T of previous COT for UE3 ₀ And T _LBT The time intervals therebetween as shown in fig. 5. So that the UE1 can indicate t according to the indication information _offset Determining a starting time T for UE3 to LBT _LBT Is T ₀ +t _offset Thus, the starting time of self LBT is determined to be T ₀ +t _offset 。

The above manner may be applied to a scenario where the time point of the UE3 initiating/initiating the first COT is dynamic, and in this scenario, the UE3 may change t _offset The value of (2) can accurately indicate the starting time of LBT of the UE3 in the above way. Optionally, in the foregoing manner, the indication information may be carried by the SCI.

In another example, the indication information may indicate the time parameter t _period ，t _period Starting time point T of previous COT for UE3 ₁ And T _LBT The time intervals therebetween as shown in fig. 6. So that the UE1 can indicate t according to the indication information _period Determining a starting time T for UE3 to LBT _LBT Is T ₁ +t _period Thus, the starting time of self LBT is determined to be T ₁ +t _period 。

The above manner may be used for a scenario (such as having periodicity) where the UE3 has a quasi-static characteristic at the time point of initiating/initiating the first COT, and by the above manner, the UE3 may quasi-statically indicate the time parameter t once _period Therefore, the time interval between the starting time point of LBT and the previous COT of the UE3 is t when the first COT is initialized/initiated every time when the first COT is initialized/initiated for a plurality of subsequent times _period . By the above manner, the UE3 can reduce the signaling overhead caused by the indication information. Optionally, in the foregoing manner, the indication information may be carried by RRC signaling.

In the above example, UE1 determines the end time point T of the previous COT for UE3 ₀ (or the starting time point T of the previous COT of UE3 ₁ ) Methods may include, but are not limited to: determining T by its own signal detection capability or from other indication information from a third terminal device ₀ (or T) ₁ )。

If the parameter when the UE3 performs the LBT includes the size of the contention window for the UE3 to perform the LBT, the UE1 may determine the size of the contention window for the UE1 to perform the LBT according to the size of the contention window for the UE3 to perform the LBT.

If the parameter when the UE3 performs LBT includes the counter value of the UE3 performing random backoff, the UE1 may determine the counter value of the UE1 performing random backoff according to the counter value of the UE3 performing random backoff.

If the parameter when the UE3 performs the LBT includes the priority of the UE3 performing the LBT, the UE1 may determine the priority of the UE1 performing the LBT according to the priority of the UE3 performing the LBT.

In the above manner, UE1 may align the random backoff (random backoff) procedure in LBT for the second COT with the random backoff procedure in LBT for the first COT by UE3, so that UE1 and UE3 complete LBT and access to the channel at the same time point.

The indication information may indicate other information besides the parameters when the UE3 performs LBT, for example, the related parameters of the first COT. So that UE1 may determine the relevant parameters of the second COT from the relevant parameters of the first COT.

Illustratively, the related parameters of the first COT include at least one of: the bandwidth corresponding to the first COT and the time slot matching structure of the first COT.

If the relevant parameter of the first COT includes a bandwidth corresponding to the first COT, the UE1 may determine, according to the bandwidth corresponding to the first COT, a bandwidth corresponding to a second COT, where the bandwidth corresponding to the second COT does not exceed the bandwidth corresponding to the first COT, that is, the bandwidth corresponding to the second COT is within the bandwidth corresponding to the first COT, or the bandwidth corresponding to the second COT is the same as the bandwidth corresponding to the first COT.

If the relevant parameter of the first COT includes the timeslot configuration structure of the first COT, the UE1 may determine the time domain configuration corresponding to the second COT according to the timeslot configuration structure of the first COT.

For example, UE1 may determine time domain resources of a second COT according to a slot matching structure of a first COT, where the time domain resources of the second COT are within the time domain resources configured for UE3 transmission in the first COT. Through the above design, UE1 may transmit in the transmission resource in the first COT, where the transmission resource is a time domain resource configured for UE3 to transmit in the first COT, so as to achieve a technical effect of resource multiplexing. Optionally, in the second COT, the frequency domain resource used by UE2 to send data to UE1 may be the same as the frequency domain resource used by UE1 to send data to UE 2. With the above design, when the slot configuration structure of the second COT includes a slot for UE1 to transmit to UE2 and a slot for UE2 to transmit to UE1, it can be guaranteed that the frequency domain resources used by UE2 in the second COT are orthogonal (i.e., non-overlapping) to the frequency domain resources used by UE3 in the first COT.

For another example, UE1 may determine a timeslot proportion structure of a second COT according to the timeslot proportion structure of the first COT, where the timeslot proportion structure of the second COT is the same as the timeslot proportion structure of the first COT. Optionally, in the first COT, a frequency domain resource used by the UE4 to send data to the UE3 is the same as a frequency domain resource used by the UE3 to send data to the UE 4; in the second COT, the frequency domain resource used by UE2 to transmit data to UE1 is the same as the frequency domain resource used by UE1 to transmit data to UE 2.

The foregoing describes a process in which UE1 and UE3 share frequency domain resources corresponding to the first COT. Based on the above procedure, in one possible embodiment, before UE1 and UE3 share the frequency domain resource corresponding to the first COT, UE1 and UE3 may negotiate to determine that UE1 and UE3 are allowed to share the frequency domain resource corresponding to the first COT. It should be noted that, the process of UE1 and UE3 negotiating to determine that UE1 and UE3 are allowed to share the frequency domain resource corresponding to the first COT may also be implemented independently without depending on the process of UE1 and UE3 sharing the frequency domain resource corresponding to the first COT.

In a specific implementation manner, as shown in fig. 7, the negotiation procedure of UE3 and UE1 may be as follows:

step 1, UE1 sends a request message to UE3, and the request message is used for requesting to share the frequency domain resource corresponding to the first COT.

Optionally, the request message may carry at least one of the following: a first parameter and a second parameter. Wherein the first parameter is used to indicate the size of the frequency domain resource (i.e. the second frequency domain resource) used by UE1, for example, the first parameter may indicate the number of interleaved resource blocks (interleaved RBs) used by UE 1. The second parameter is used to indicate the size of the bandwidth of UE1, for example, the size of the bandwidth used by UE1 may be 20MHz, or 40MHz, or 60MHz, or 80MHz. UE1 sends to UE3 a second parameter that may be used to request that the bandwidth of the unlicensed spectrum of 20MHz, or 40MHz, or 60MHz, or 80MHz be used in shared with UE 3. Optionally, the first parameter and/or the second parameter may be an RRC signaling parameter.

Through the design, when the UE1 sends the request message to the UE3, the request message also carries the information about the unlicensed spectrum resource that the UE1 requests to occupy, which is helpful for the UE3 to determine whether to accept sharing of the unlicensed spectrum with the UE1, so that the UE1 and the UE3 can perform more effective coordination, and system reliability reduction caused by using non-orthogonal (i.e., overlapping) frequency domain resources is avoided. For example, the size of the frequency domain resource used by UE1 is N staggered resource blocks, where N is a positive integer. The size of the frequency domain resource used when UE3 sends SL data to UE4 is M interleaved resource blocks, where M is a positive integer. If M + N is less than or equal to the total number of staggered resource blocks within the bandwidth of the unlicensed spectrum, then UE1 and UE3 may potentially share the unlicensed spectrum by using orthogonal (i.e., non-overlapping) frequency domain resources.

For example, when the subcarrier spacing is 30kHz, the total number of staggered resource blocks within the bandwidth of the unlicensed spectrum may be 5, and when the subcarrier spacing is 15kHz, the total number of staggered resource blocks within the bandwidth of the unlicensed spectrum may be 10. Taking the total number of staggered resource blocks in the bandwidth of the unlicensed spectrum as 5 as an example, the value range of N is {1,2,3,4}. Taking the total number of interlaced resource blocks within the bandwidth of the unlicensed spectrum as an example of 10, the value range of N is {1,2,3,4,5,6,7,8,9}.

And 2, the UE3 sends a response message to the UE1 when determining that the UE1 is allowed to share the frequency domain resources corresponding to the first COT, wherein the response message is used for indicating that the UE1 is allowed to share the frequency domain resources corresponding to the first COT.

In a possible implementation manner, the UE3 may also send a response message to the UE1 when determining that the UE1 is not allowed to share the frequency domain resource corresponding to the first COT, where the response message is used to indicate that the UE1 is not allowed to share the frequency domain resource corresponding to the first COT. For example, UE3 may send an Acknowledgement (ACK) to UE1 when determining that UE1 is allowed to share the frequency domain resource corresponding to the first COT, or may send a Negative Acknowledgement (NACK) to UE1 when determining that UE1 is not allowed to share the frequency domain resource corresponding to the first COT. Through the design, the UE3 determines whether to accept sharing of the unlicensed spectrum with the UE1 and then sends the response message to the UE1, which is helpful for the UE1 to determine whether to share the unlicensed spectrum with the UE3 in an FDM manner, so that system reliability reduction caused by using non-orthogonal frequency domain resources can be avoided.

Optionally, when the response message is an ACK, the response message may carry at least one of the following: a third parameter and a fourth parameter. Wherein the third parameter is used for indicating the position of the second frequency domain resource, and the fourth parameter is used for indicating the position of the bandwidth of the UE 3. Optionally, the third parameter and/or the fourth parameter may be an RRC signaling parameter. The third parameter may indicate a number of a first interleaved resource block in the second frequency domain resource in remaining interleaved resource blocks, where the remaining interleaved resource blocks include interleaved resource blocks in the frequency domain resource corresponding to the first COT except for the first frequency domain resource. The fourth parameter may indicate an offset value of the bandwidth of UE1 relative to the bandwidth of UE 3.

By utilizing the above design, when the UE3 accepts sharing of the unlicensed spectrum with the UE1, the UE3 may indicate the position of the bandwidth of the unlicensed spectrum that the UE1 can use by sending the fourth parameter to the UE1, and/or the UE3 may indicate the position of the frequency domain resource that the UE1 can use by sending the third parameter to the UE1, so that the UE3 may limit the unlicensed spectrum that the UE1 can share for use, which is beneficial to improving the coordination effect among terminal devices, and is also beneficial to reasonably configuring the unlicensed spectrum that each terminal device can use for each terminal device under the condition that a plurality of first terminal devices exist in the network, thereby avoiding mutual interference among the plurality of terminal devices.

For example, the frequency domain resource used by UE1 in the first COT is numbered n in the remaining interleaved resource blocks, where n is an integer greater than or equal to 0. When the size of the frequency domain resource used by UE1 is N staggered resource blocks, and the size of the frequency domain resource used by UE3 when sending data to UE4 is M staggered resource blocks, UE3 may indicate the location of the N staggered resource blocks it can use by sending a third parameter to UE 1.

Step 3, UE1 determines that the frequency domain resources corresponding to the first COT can be shared with UE3 in FDM manner.

In one possible implementation, the UE1 receives first indication information from the UE3, where the first indication information is used to indicate a size and a location of a frequency domain resource to be used by the UE3 within the first COT. When the response message received by the UE1 from the UE3 includes ACK, the UE1 determines the location of the frequency domain resource used by itself in the first COT according to the first indication information. Optionally, the first indication information may be indication information in SCI. In connection with the method shown in fig. 3, the first information may be indication information involved in the method shown in fig. 3.

Specifically, the UE1 may determine, according to the first indication information and the third parameter, a location of a frequency domain resource (i.e., the second frequency domain resource) used by itself in the first COT. The UE1 may determine, according to the first indication information, the size and the location of the frequency domain resource occupied by the UE3 in the first COT (i.e., the first frequency domain resource), thereby obtaining the size and the location of the remaining available frequency domain resource in the bandwidth of the unlicensed spectrum. Further, the UE1 may determine the location of the frequency domain resource to be used by itself in the above remaining available frequency domain resources according to the third parameter.

For example, as shown in fig. 8, assuming that the total number of interleaved resource blocks within the bandwidth of the unlicensed spectrum is 5, the size of the frequency domain resource requested to be used by UE1 is N =1 interleaved resource blocks, the third parameter from UE3 indicates that the frequency domain resource that UE1 can use within the frequency domain resource corresponding to the first COT is numbered 1 in the remaining interleaved resource blocks (i.e., N =1, where the number of the first interleaved resource block in the remaining interleaved resource blocks is 0, i.e., N = 0). When the first indication information indicates that the frequency domain resource to be used by UE3 within the first COT is M =3 interleaved resource blocks corresponding to M =0, M =1 and M =2, UE1 determines to use itself N =1 interleaved resource blocks corresponding to M =4 according to N = 1. When the first indication information indicates that the frequency domain resources to be used by UE3 within the first COT are M =4 interleaved resource blocks corresponding to M =1, M =2, M =3, and M =4, UE1 determines that it may not share the unlicensed spectrum with UE3 according to n = 1. Since only 5-M =1 interleaved resource blocks remain in the bandwidth of the unlicensed spectrum except for M =4 interleaved resource blocks, the offset value N =1 is valid only when the number of remaining interleaved resource blocks 5-M ≧ N + N. That is, when M + N is greater than the total number of interleaved resource blocks within the bandwidth of the unlicensed spectrum, UE1 determines that it cannot use any frequency-domain resource within the frequency-domain resources corresponding to the first COT.

Optionally, after receiving the response message indicating that the UE1 is not allowed to share the frequency domain resource corresponding to the first COT, the UE1 may determine not to share the frequency domain resource corresponding to the first COT with the UE3 in the FDM manner.

By the method shown in fig. 7, UE1 may coordinate with UE3 before UE3 initiates/initiates the first COT, requesting to share frequency domain resources on part or all of the time domain resources within the first COT with UE3 in FDM manner.

The above negotiation process may also be referred to as a request process or may also be described as an association (association) process. Through the above process, after UE1 associates with UE3, UE1 may serve as a slave (secondary) terminal device, and UE3 may serve as a primary (primary) terminal device.

The coordination process is suitable for resource coordination of terminal equipment at a sending end which belongs to different communication pairs, the limitation that the terminal equipment which only belongs to the same communication pair can be coordinated with each other at present is broken through, access network equipment or terminal equipment with a centralized scheduling function does not need to exist in a network through the coordination process, simple signaling interaction is only needed among the terminal equipment, and unauthorized frequency spectrum can be continuously shared in subsequent COTs after the signaling interaction is completed. Compared with direct scheduling of resources, the method can reduce the interactive overhead of the scheduling signaling and further improve the resource utilization efficiency of the unlicensed spectrum.

The following describes a negotiation procedure between terminal devices with reference to a specific example. Assume that a total number of interleaved resource blocks within the bandwidth of the unlicensed spectrum is 5,ue3 will use M =3 interleaved resource blocks for SL transmissions with UE4 in the first COT. The process may include steps S1 to S3.

S1, as shown in fig. 9, 3 terminal devices send request messages to UE3, where the 3 terminal devices are numbered 1,2, and 3, respectively.

The method comprises the steps that a terminal device with the number of 1 and a terminal device with the number of 2 respectively send request messages to UE3, the request messages and the UE3 share an unlicensed spectrum, and the size of used frequency domain resources is N =1 staggered resource blocks; the terminal device numbered 3 also sends a request message to UE3 requesting sharing of the unlicensed spectrum with UE3, and the size of the used frequency domain resource is N =3 interleaved resource blocks.

S1, in fig. 10, UE3 sends a response message to the 3 terminal devices.

Since the size of the frequency domain resource requested to be used by the terminal equipment with the number of 3 is N =3 interlaced resource blocks, and N + M =3+4=7 > 5, the frequency domain resource that needs to be shared is too large, so UE3 sends a response message including NACK to the terminal equipment with the number of 3; since the size of the frequency domain resource requested to be used by terminal device No. 1 and terminal device No. 2 is N =1 interleaved resource blocks, and M +1 ≦ 5 is satisfied, UE3 sends a response message including ACK to terminal device No. 1, where the response message further includes an offset value of N =0 for indicating that N =1 interleaved resource block that may be used by terminal device No. 1 is the 1 st interleaved resource block in the remaining 2 interleaved resource blocks except M =3 interleaved resource blocks within the bandwidth of the unlicensed spectrum. Similarly, UE3 sends a response message including an ACK to terminal device number 2, which further includes an offset value of N =1 for indicating that N =1 staggered resource blocks that terminal device number 2 can use are the 2 nd staggered resource block of the remaining 2 staggered resource blocks within the bandwidth of the unlicensed spectrum except for M =3 staggered resource blocks.

And S3, the terminal equipment numbered 1 and the terminal equipment numbered 2 determine that the frequency domain resources corresponding to the first COT can be shared with the UE3 in an FDM mode.

When the frequency domain resource to be used by UE3 in the first COT is M =3 interlaced resource blocks corresponding to M =0, M =1, and M =2, the terminal device numbered 1 determines to use the interlaced resource block numbered 0 of the two interlaced resource blocks M =3 and M =4, i.e., the interlaced resource block numbered M =3, according to n =0, and the terminal device numbered 2 determines to use the interlaced resource block numbered 1 of the two interlaced resource blocks M =3 and M =4, i.e., the interlaced resource block numbered M =4, according to n = 1.

In the embodiment of the application, the indication information indicates the parameter of the second terminal device during LBT, so that the first terminal device and the second terminal device can access the channel together at the same time point, and thus, the problem that one terminal device fails to compete due to the fact that another terminal device fails to perform LBT in advance can be avoided. And, by the frequency domain information indicated by the indication information, the frequency domain resources used by the first terminal device during occupying the channel and the frequency domain resources used by the second terminal device during occupying the channel may not overlap, thereby avoiding resource conflict. By the method, frequency division multiplexing among different terminal devices can be realized, so that the resource use efficiency of the SL-U system can be improved, and the communication time delay can be reduced.

In addition, through the coordination process, access network equipment or terminal equipment with a centralized scheduling function does not need to exist in the network, and only simple signaling interaction is needed among the terminal equipment, so that the unlicensed spectrum can be continuously shared in the subsequent COT after the signaling interaction is completed. Compared with direct scheduling of resources, the method can reduce the interactive overhead of the scheduling signaling and further improve the resource utilization efficiency of the unlicensed spectrum.

Based on the same inventive concept as the method embodiment, the embodiment of the present application provides a communication device, which may have a structure as shown in fig. 11 and includes a communication module 1101 and a processing module 1102. The processing module 1102 is used for processing algorithms, software, programs, storage, etc. involved in the communication process. The communication module 1101 is configured to send and receive signals, and optionally, the communication module 1101 may include a sending module and a receiving module, where the sending module is configured to send wireless signals, and the receiving module is configured to receive wireless signals.

In a specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the first terminal device in the embodiments described in fig. 3 to fig. 10, and the apparatus may be the first terminal device itself, or may be a chip or a chip set in the first terminal device, or a part of the chip for performing the function of the related method. The communication module 1101 receives indication information from the second terminal device, where the indication information indicates: the parameter of the second terminal device during listen before talk LBT and the parameter of the first frequency domain resource used by the second terminal device, wherein the first frequency domain resource belongs to the frequency domain resource corresponding to the first COT, and the first COT is used for the communication between the second terminal device and the third terminal device; the processing module 1102 is configured to occupy a second COT based on a parameter of the second terminal device during LBT, where a second frequency domain resource used by the first terminal device in the second COT belongs to a frequency domain resource corresponding to the first COT, the second frequency domain resource is not overlapped with the first frequency domain resource, and the second COT is used for the first terminal device and a fourth terminal device to communicate.

Optionally, the indication information further indicates: a parameter associated with the first COT; a processing module 1102, further configured to: and determining the relevant parameters of the second COT according to the relevant parameters of the first COT.

Illustratively, the related parameters of the first COT include at least one of: the bandwidth corresponding to the first COT and the time slot matching structure of the first COT are obtained. Accordingly, the related parameters of the second COT include at least one of: bandwidth corresponding to the second COT, and time domain resources corresponding to the second COT. The bandwidth corresponding to the second COT is within the bandwidth corresponding to the first COT, the time domain resource corresponding to the second COT is within the first class of time domain resource corresponding to the first COT, and the first class of time domain resource is used for the second terminal device to send the sideline data.

For example, the parameter when the second terminal device performs LBT includes at least one of the following: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the counter value of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT.

Optionally, before receiving the indication information from the second terminal device, the communication module 1101 is further configured to: sending a request message to a second terminal device, wherein the request message is used for requesting to share the frequency domain resource corresponding to the first COT; and receiving a response message from the second terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT.

Illustratively, the request message carries at least one of: a first parameter and a second parameter. The first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal device.

Illustratively, the response message carries at least one of: a third parameter and a fourth parameter. The third parameter is used for indicating the position of the second frequency domain resource, and the fourth parameter is used for indicating the position of the bandwidth of the first terminal device.

For example, the third parameter indicates a number of a first interleaved resource block in the second frequency domain resource in remaining interleaved resource blocks, where the remaining interleaved resource blocks include interleaved resource blocks in the frequency domain resource corresponding to the first COT except for the first frequency domain resource.

The fourth parameter indicates an offset value of the bandwidth of the first terminal device relative to the bandwidth of the second terminal device.

In another specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the second terminal device in the embodiments described in fig. 3 to fig. 10, and the apparatus may be the second terminal device itself, or may be a chip or a chip set in the second terminal device, or a part of a chip in the chip for performing the function of the related method. The processing module 1102 determines indication information, where the indication information is used to indicate that a first terminal device and a second terminal device share a frequency domain resource corresponding to a first COT, the first COT is used for communication between the second terminal device and a third terminal device, and the indication information indicates: the parameter of the second terminal device during listen before talk LBT and the parameter of the first frequency domain resource used by the second terminal device, where the first frequency domain resource belongs to the frequency domain resource corresponding to the first COT; a communication module 1101, configured to send the indication information to the first terminal device.

Illustratively, the indication information further indicates: a parameter associated with the first COT.

For example, the relevant parameters of the first COT include at least one of: the bandwidth corresponding to the first COT and the time slot matching structure of the first COT.

Illustratively, the parameter of the second terminal device during LBT includes at least one of: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the value of a counter of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT.

Optionally, before sending the indication information to the first terminal device, the communication module 1101 is further configured to: receiving a request message from the first terminal device, where the request message is used to request to share the frequency domain resource corresponding to the first COT. Correspondingly, the processing module 1102 is further configured to determine that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT. Further, the communication module 1101 is further configured to: and sending a response message to the first terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resources corresponding to the first COT.

Illustratively, the request message carries at least one of: a first parameter and a second parameter. Wherein the first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal device. Correspondingly, when determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT, the processing module 1102 may specifically be configured to: determining, according to the first parameter and the number of interleaved resource blocks included in the first frequency domain resource, to allow the first terminal device to share the frequency domain resource corresponding to the first COT; and/or determining, according to the second parameter and the size of the bandwidth of the second terminal device, that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT.

Illustratively, the response message carries at least one of: a third parameter and a fourth parameter. Wherein the third parameter is used to indicate a location of the second frequency domain resource, and the fourth parameter is used to indicate a location of a bandwidth of the first terminal device.

For example, the third parameter indicates a number of a first interleaved resource block in the second frequency domain resource among remaining interleaved resource blocks, the remaining interleaved resource blocks including interleaved resource blocks in the frequency domain resource corresponding to the first COT except for the first frequency domain resource.

The division of the modules in the embodiments of the present application is schematic, and is only a logical function division, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, or may exist alone physically, or two or more modules are integrated in one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It is understood that the functions or implementations of the respective modules in the embodiments of the present application may further refer to the related description of the method embodiments.

In a possible manner, the communication apparatus may be as shown in fig. 12, and the apparatus may be a communication device or a chip in the communication device, where the communication device may be the first terminal device in the foregoing embodiment or the second terminal device in the foregoing embodiment. The apparatus includes a processor 1201 and a communication interface 1202, and may also include a memory 1203. The processing module 1102 may be the processor 1201. The communication module 1101 may be a communication interface 1202.

The processor 1201 may be a CPU, a digital processing unit, or the like. The communication interface 1202 may be a transceiver, an interface circuit such as a transceiver circuit, etc., a transceiver chip, etc. The device also includes: a memory 1203 for storing programs executed by the processor 1201. The memory 1203 may be a non-volatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), such as a random-access memory (RAM). The memory 1203 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.

The processor 1201 is configured to execute the program code stored in the memory 1203, and is specifically configured to execute the actions of the processing module 1102, which is not described herein again. The communication interface 1202 is specifically configured to perform the operations of the communication module 1101, which is not described herein again.

The embodiment of the present application does not limit the specific connection medium among the communication interface 1202, the processor 1201 and the memory 1203. In the embodiment of the present application, the memory 1203, the processor 1201 and the communication interface 1202 are connected by the bus 1204 in fig. 12, the bus is represented by a thick line in fig. 12, and the connection manner between the other components is only schematically illustrated and is not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 12, but that does not indicate only one bus or one type of bus.

The embodiment of the present invention further provides a computer-readable storage medium, which is used for storing computer software instructions required to be executed for executing the processor, and which contains a program required to be executed for executing the processor.

An embodiment of the present application further provides a communication system, which includes a communication device for implementing the function of a first terminal device in the embodiment described in fig. 3 to fig. 10, and a communication device for implementing the function of a second terminal device in the embodiment described in fig. 3 to fig. 10.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A sidelink communication method, adapted for a first terminal device, the method comprising:

receiving indication information from a second terminal device, wherein the indication information indicates that: the parameter of the second terminal device during listen before talk LBT and the parameter of the first frequency domain resource used by the second terminal device, where the first frequency domain resource belongs to a frequency domain resource corresponding to a first channel occupation time COT, and the first COT is used for the communication between the second terminal device and a third terminal device;

and occupying a second COT based on the parameter when the second terminal device performs LBT, wherein a second frequency domain resource used by the first terminal device in the second COT belongs to a frequency domain resource corresponding to the first COT, the second frequency domain resource is not overlapped with the first frequency domain resource, and the second COT is used for the first terminal device and a fourth terminal device to communicate.

2. The method of claim 1, wherein the indication information further indicates: a parameter associated with the first COT;

the method further comprises the following steps:

and determining the related parameters of the second COT according to the related parameters of the first COT.

3. The method of claim 2, wherein the related parameters of the first COT comprise at least one of: bandwidth corresponding to the first COT and a time slot matching structure of the first COT;

the related parameters of the second COT include at least one of: bandwidth corresponding to the second COT and time domain resources corresponding to the second COT, where the bandwidth corresponding to the second COT is within the bandwidth corresponding to the first COT, the time domain resources corresponding to the second COT are within a first class of time domain resources corresponding to the first COT, and the first class of time domain resources is used for the second terminal device to send sideline data.

4. The method according to any of claims 1-3, wherein the parameters when the second terminal device performs LBT comprise at least one of: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the value of a counter of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT.

5. The method according to any of claims 1-4, wherein prior to receiving indication information from the second terminal device, the method further comprises:

sending a request message to the second terminal device, where the request message is used to request to share the frequency domain resource corresponding to the first COT;

receiving a response message from the second terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT.

6. The method of claim 5, wherein the request message carries at least one of: the first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal device.

7. The method of claim 6, wherein the response message carries at least one of: a third parameter and a fourth parameter, wherein the third parameter is used for indicating a location of the second frequency domain resource, and the fourth parameter is used for indicating a location of a bandwidth of the first terminal device.

8. The method of claim 7, wherein the third parameter indicates a number of a first one of the second frequency-domain resources among remaining interleaved resource blocks, the remaining interleaved resource blocks including interleaved resource blocks of the frequency-domain resources corresponding to the first COT other than the first frequency-domain resource.

9. The method of claim 7 or 8, wherein a fourth parameter indicates an offset value of the bandwidth of the first terminal device relative to the bandwidth of the second terminal device.

10. A sidelink communication method, adapted for a second terminal device, the method comprising:

determining indication information, where the indication information is used to indicate that a first terminal device and a second terminal device share a frequency domain resource corresponding to a first channel occupancy time COT, the first COT is used for communication between the second terminal device and a third terminal device, and the indication information indicates: the parameter of the second terminal device during listen before talk LBT and the parameter of the first frequency domain resource used by the second terminal device, where the first frequency domain resource belongs to the frequency domain resource corresponding to the first COT;

and sending the indication information to the first terminal equipment.

11. The method of claim 10, wherein the indication information further indicates: a parameter associated with the first COT.

12. The method of claim 11, wherein the related parameters of the first COT comprise at least one of: and the bandwidth corresponding to the first COT and the time slot matching structure of the first COT.

13. The method according to any of claims 10-12, wherein the parameters when the second terminal device performs LBT comprise at least one of: the starting time of the second terminal device for performing LBT, the size of a contention window of the second terminal device for performing LBT, the value of a counter of the second terminal device for performing random backoff, and the priority of the second terminal device for performing LBT.

14. The method of any of claims 10-13, wherein prior to sending the indication information to the first terminal device, the method further comprises:

receiving a request message from the first terminal device, where the request message is used to request to share a frequency domain resource corresponding to the first COT;

determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT;

and sending a response message to the first terminal device, where the response message is used to indicate that the first terminal device is allowed to share the frequency domain resources corresponding to the first COT.

15. The method of claim 14, wherein the request message carries at least one of: a first parameter and a second parameter, wherein the first parameter is used for indicating the number of staggered resource blocks included in the second frequency domain resource, and the second parameter is used for indicating the size of the bandwidth of the first terminal device;

the determining that the first terminal device is allowed to share the frequency domain resource corresponding to the first COT includes:

determining, according to the first parameter and the number of interleaved resource blocks included in the first frequency domain resource, to allow the first terminal device to share the frequency domain resource corresponding to the first COT; and/or

And determining, according to the second parameter and the size of the bandwidth of the second terminal device, to allow the first terminal device to share the frequency domain resource corresponding to the first COT.

16. The method of claim 15, wherein the response message carries at least one of: a third parameter and a fourth parameter, wherein the third parameter is used for indicating a location of the second frequency domain resource, and the fourth parameter is used for indicating a location of a bandwidth of the first terminal device.

17. The method of claim 16, wherein the third parameter indicates a number of a first one of the second frequency-domain resources among remaining interleaved resource blocks, the remaining interleaved resource blocks comprising interleaved resource blocks of the frequency-domain resources corresponding to the first COT other than the first frequency-domain resource.

18. The method of claim 16 or 17, wherein a fourth parameter indicates an offset value of the bandwidth of the first terminal device relative to the bandwidth of the second terminal device.

19. A communications apparatus, characterized in that the apparatus comprises means for implementing the method according to any one of claims 1-9; alternatively, the apparatus comprises means for implementing the method of any one of claims 10-18.

20. A communications apparatus, comprising:

a memory to store instructions;

a processor configured to retrieve and execute the instructions from the memory, so that the communication device performs the method according to any one of claims 1-9 or performs the method according to any one of claims 10-18.

21. A communication system comprising a first terminal device and a second terminal device, wherein the first terminal device is configured to implement the means of the method according to any one of claims 10-18, and the second terminal device is configured to implement the means of the method according to any one of claims 1-9.

22. A computer-readable storage medium having stored therein instructions that, when invoked on a computer, cause the computer to perform the method of any of claims 1-9 or to perform the method of any of claims 10-18.

23. A computer program product, which, when run on a computer, causes the computer to perform the method of any one of claims 1-9 or to perform the method of any one of claims 10-18.