CN117460079A

CN117460079A - Indication information sending method, device and system

Info

Publication number: CN117460079A
Application number: CN202210837741.XA
Authority: CN
Inventors: 齐鸿; 杨子豪; 苏宏家; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2024-01-26
Also published as: WO2024012129A1

Abstract

An indication information sending method, device and system. The method comprises the following steps: the first terminal device receives first indication information from the second terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resource is used for sending first side-line information, and the first priority information is used for indicating the priority of the first side-line information; the first terminal device performs channel access on a first channel; and under the condition that the priority of the information to be transmitted of the first terminal device is lower than that of the first side information, the first terminal device transmits second indication information to the second terminal device on the first channel, wherein the second indication information is used for indicating that second time-frequency resources in the occupation time of the first channel are time-frequency resources shared to the second terminal device, and the time-domain positions of the second time-frequency resources are the same as that of the first time-frequency resources. Based on the scheme, the transmission of the high-priority information at the time when the high-priority information is expected to be transmitted can be ensured as much as possible, and the transmission reliability of the high-priority information is improved.

Description

Indication information sending method, device and system

Technical Field

The embodiment of the application relates to the field of communication, in particular to a method, a device and a system for transmitting sidestream indication information.

Background

In a wireless communication system, frequency bands used by communication devices can be classified into Licensed (Licensed) frequency bands and Unlicensed (Unlicensed) frequency bands. In the licensed band, the communication device uses spectrum resources based on the scheduling of the central node. In the unlicensed band, the communication devices contend for the channel through a listen before talk (listen before talk, LBT) mechanism.

The LBT mechanism is a channel access rule based on random back-off. A communication device needs to perceive (sense) whether a channel is idle before accessing the channel and beginning to transmit data, and if the channel remains idle for a period of time, it can occupy the channel and transmit data in the channel. The length of time that the channel is occupied is called the channel occupancy time (channel occupancy time, COT).

In a New Radio (NR) system under unlicensed spectrum, an LBT mechanism supports COT sharing, that is, after a communication device obtains the COT through LBT, unlicensed spectrum resources in the COT may be shared with other communication devices. In the COT sharing mechanism of NR-U, unlicensed spectrum resources shared within the COT may be scheduled by the base station.

However, in a Sidelink (SL) scenario under unlicensed spectrum, the base station may not participate in resource allocation and scheduling, and at this time, the sidelink resource sharing between the terminal devices may cause a decrease in service quality.

Disclosure of Invention

The application provides a sidestream information sending method, device and system, which can improve sidestream information transmission reliability through sidestream resource sharing.

In a first aspect, an indication information sending method is provided, where the method may be performed by the first terminal device, or may be performed by a component of the first terminal device, for example, a processor, a chip, or a chip system of the first terminal device, or may be implemented by a logic module or software that can implement all or part of the functions of the first terminal device. The method comprises the following steps: the method comprises the steps that a first terminal device receives first indication information from a second terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, and the first priority information is used for indicating priority of the first side-line information; the first terminal device performs channel access on a first channel to obtain the channel occupation time of the first channel; and under the condition that the priority of the information to be sent of the first terminal device is lower than the priority of the first side information, the first terminal device sends second indication information to the second terminal device on the first channel, wherein the second indication information is used for indicating that second time-frequency resources in the channel occupation time of the first channel are time-frequency resources shared to the second terminal device, and the time-frequency resources are the same as the time-domain position of the first time-frequency resources.

Based on the scheme, the second terminal device reserves the first time-frequency resource to the first terminal device, and the first terminal device shares the second time-frequency resource in the channel occupation time of the first channel to the second terminal device when the priority of the side information of the second terminal device is higher, so that the second terminal device sends the first side information.

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

Based on the possible design, the first terminal device determines the frequency domain position of the second time-frequency resource in the first channel according to the relative position of the first time-frequency resource in the channel, in this way, the relative frequency domain position of the second time-frequency resource shared with the second terminal device can be ensured to be the same as the relative frequency domain position of the reserved resource in the channel, and the reliability of the first side information transmission can be further improved.

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

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

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

Based on the possible design, the first terminal device receives the sidestream information of the second terminal device on the shared resource, namely, the two terminal devices are one communication pair, and in this case, the performance of information transmission between the communication pairs is effectively improved.

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

Based on this possible design, the transmission time of the second indication information is at least a few symbols or a few slots earlier than the time-domain start time of the first time-frequency resource, leaving enough time for the data preparation of the second terminal device.

In one possible design, the first indication information is physical layer side uplink control information, or medium access control layer side uplink control information, or radio resource control layer side uplink control information.

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

In one possible design, the first time-frequency resource information is used to indicate a time-domain resource of the first time-frequency resource, and/or a frequency-domain resource of the first time-frequency resource; the first time-frequency resource information is also used for indicating a first period. And the second terminal device periodically transmits side line information according to the received first period, wherein the transmitted side line information comprises the first side line information.

In one possible design, the second time-frequency resource may be used for the first terminal device to transmit information to the third terminal device.

In a second aspect, a sidestream information sending method is provided, where the method may be performed by the second terminal device, or may be performed by a component of the second terminal device, for example, a processor, a chip, or a chip system of the second terminal device, or may be implemented by a logic module or software capable of implementing all or part of the functions of the second terminal device. The method comprises the following steps: the method comprises the steps that a second terminal device sends first indication information to a first terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, and the first priority information is used for indicating priority of the first side-line information; the second terminal device receives second indication information from the first terminal device, wherein the second indication information is used for indicating that second time-frequency resources in channel occupation time of a first channel are time-frequency resources shared to the second terminal device, and the time-domain positions of the second time-frequency resources and the first time-frequency resources are the same; and the second terminal device sends the first side information on the second time-frequency resource.

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

In one possible design, the second indication information is received at a time earlier than a time domain start time of the first time-frequency resource.

In a third aspect, a communication method is provided, which may be performed by the first terminal device, or a component of the first terminal device, for example, a processor, a chip, or a chip system of the first terminal device, or a logic module or software capable of implementing all or part of the functions of the first terminal device. The method comprises the following steps: the method comprises the steps that a first terminal device receives first indication information from a second terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, the first time-frequency resources are located in a first channel, and the first priority information is used for indicating priority of the first side-line information; and under the condition that the priority of the second side line information to be sent by the first terminal device is lower than that of the first side line information, the first terminal device selects the first channel from at least two channels to carry out channel access.

Based on the scheme, when the priority of the information to be sent is lower than that of the data to be sent of the second terminal device, the first terminal device selects a first channel where the reserved resource of the second terminal device is located from a plurality of channels to carry out channel access, so that the first channel preemption success rate of the channel where the first time-frequency resource is located is improved, if preemption is successful, the first terminal device shares the channel to the second terminal device, and the sending success rate of the high-priority side-line information is improved. For example, when the second terminal device cannot preempt the channel, the first terminal device performs channel preemption and shares the channel preemption with the second terminal device, so that the overall transmission performance of the sidestream transmission is improved.

In one possible design, the first terminal device determines that the first channel is idle during the channel access; the first terminal device sends second indication information to the second terminal device, wherein the second indication information is used for indicating that the first time-frequency resource is a time-frequency resource shared to the second terminal device, and the first time-frequency resource is located in the channel occupation time of the first channel.

In one possible design, the method further comprises: the first terminal device receives the first side information from the second terminal device on the first time-frequency resource.

In one possible design, the first terminal device further includes, before selecting the first channel from at least two channels for channel access: the first terminal device receives third indication information from a third terminal device, the third indication information comprises second time-frequency resource information and second priority information, the second time-frequency resource information is used for indicating the third terminal device to send third time-frequency resources of third side line information, the third time-frequency resources are located in a second channel, the second priority information is used for indicating the priority of the third side line information, the at least two channels further comprise the second channel, and the priority of the third side line information is lower than that of the first side line information.

In a fourth aspect, a communication method is provided, which may be performed by the second terminal device, or may be performed by a component of the second terminal device, for example, a processor, a chip, or a chip system of the second terminal device, or may be implemented by a logic module or software capable of implementing all or part of the functions of the second terminal device. The method comprises the following steps: the second terminal device sends first indication information to the first terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, the first time-frequency resources are located in a first channel, and the first priority information is used for indicating priority of the first side-line information; the second terminal device receives second indication information from the first terminal device, wherein the second indication information is used for enabling the first time-frequency resource to be a time-frequency resource shared to the second terminal device; and the second terminal device sends the first side-line information on the first time-frequency resource.

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

In one possible design, the first time-frequency resource is located within a channel occupation time of a first channel, where the channel occupation time of the first channel is acquired by the first terminal device.

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

In some possible designs, the communication device may include a processing module and a transceiver module. The processing module may be configured to implement the processing functions of any of the aspects described above and any possible implementation thereof. The transceiver module may comprise a receiving module and a transmitting module for implementing the receiving function and the transmitting function, respectively, in any of the above aspects and any possible implementation thereof.

In some possible designs, the transceiver module may be formed by a transceiver circuit, transceiver, or communication interface.

In a sixth aspect, there is provided a communication apparatus comprising: a processor and a memory; the memory is for storing computer instructions which, when executed by the processor, cause the communications device to perform the method of any of the aspects. The communication means may be the first terminal device of the first aspect or the second aspect or the third aspect, or a device comprised in the first terminal device, such as a chip.

In a seventh aspect, there is provided a communication apparatus comprising: a processor and a communication interface; the communication interface is used for communicating with a module outside the communication device; the processor is configured to execute a computer program or instructions to cause the communication device to perform the method of any of the aspects. The communication means may be the first terminal device of the first aspect or the second aspect or the third aspect, or a device comprised in the first terminal device, such as a chip.

An eighth aspect provides a communication apparatus comprising: at least one processor; the processor is configured to execute a computer program or instructions stored in the memory to cause the communication device to perform the method of any of the aspects. The memory may be coupled to the processor or may be separate from the processor. The communication means may be the first terminal device of the first aspect or the second aspect or the third aspect, or a device comprised in the first terminal device, such as a chip.

In a ninth aspect, there is provided a computer readable storage medium having stored therein a computer program or instructions which, when run on a communication device, enable the communication device to perform the method of any of the aspects.

In a tenth aspect, there is provided a computer program product comprising instructions which, when run on a communications device, cause the communications device to perform the method of any of the aspects.

In an eleventh aspect, there is provided a communications device (e.g. which may be a chip or a system of chips) comprising a processor for carrying out the functions referred to in any of the aspects.

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

In some possible designs, the device may be a system-on-chip, may be formed from a chip, or may include a chip and other discrete devices.

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

The technical effects of any one of the fifth to tenth aspects may be referred to as technical effects of different designs in the first or second aspects, and are not described herein.

Drawings

Fig. 1 is a schematic structural diagram of a communication system provided in the present application;

fig. 2 is a schematic diagram of a scenario in which a terminal device provided in the present application is in a network coverage area;

FIG. 3 is a schematic diagram of a listen-before-talk mechanism provided herein;

fig. 4 is a schematic flow chart of an information sending method provided in the present application;

fig. 5 is a schematic diagram of information sharing of an information side line provided in the present application;

Fig. 6 is a flow chart of another information sending method provided in the present application;

FIG. 7 is a schematic diagram of another information sharing of information side lines provided in the present application;

FIG. 8 is a schematic diagram of another information sharing of the information side line provided in the present application;

FIG. 9 is a schematic diagram of another information sharing of information side lines provided in the present application;

FIG. 10 is a schematic diagram of another information sharing of the information side line provided in the present application;

FIG. 11 is a schematic diagram of a resource pool according to the present disclosure;

fig. 12 is a schematic structural diagram of an interleaved PRB provided in the present application;

fig. 13 is a schematic diagram of the locations of a PSCCH and a PSSCH provided in the present application;

fig. 14 is a schematic structural diagram of a terminal device provided in the present application.

Fig. 15 is a schematic structural diagram of a terminal device provided in the present application.

Detailed Description

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

The technical solutions provided in the embodiments of the present application may be applied to various communication systems, such as a 5G (fifth generation (5th generation,5G) or New Radio (NR) system, a long term evolution (long term evolution, LTE) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD) system, etc., the technical solutions provided in the present application may also be applied to future communication systems, such as a sixth generation mobile communication system.

In addition, the technical solution provided in the embodiments of the present application may be applied to a link between a network device and a terminal device, and may also be applied to a link between devices, for example, a device to device (D2D) link. The D2D link may also be referred to as a sidelink, which may also be referred to as a side link, a sidelink, etc. In the embodiment of the present application, the D2D link, or the side link, refers to a link established between devices of the same type, and the meanings of the links are the same. The same type of device may be a link between terminal devices, a link between network devices, a link between relay nodes, or the like, which is not limited in the embodiment of the present application. For the link between the terminal equipment and the terminal equipment, there is a D2D link defined by release (Rel) -12/13 of the third generation partnership project (3rd generation partnership project,3GPP), and also a internet of vehicles link defined by 3GPP for the internet of vehicles. It should be appreciated that V2X specifically includes vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) or V2X links of a vehicle to any entity, including Rel-14/15. V2X also includes Rel-16, which is currently under study by 3GPP, and subsequent releases of V2X links based on NR systems, and the like. V2V refers to communication between vehicles; V2P refers to vehicle-to-person (including pedestrians, cyclists, drivers, or passengers) communication; V2I refers to the communication of the vehicle with an infrastructure, such as a Road Side Unit (RSU) or a network device, and a further V2N may be included in the V2I, V2N refers to the communication of the vehicle with the network device. Among them, RSUs include two types: the terminal type RSU is in a non-moving state because the terminal type RSU is distributed at the roadside, and mobility does not need to be considered; the base station type RSU may provide timing synchronization and resource scheduling for vehicles with which it communicates.

Architecture diagrams of mobile communication systems applied in embodiments of the present application. As shown in fig. 1, fig. 1 is a schematic architecture diagram of a communication system 1000 to which an embodiment of the present application applies. As shown in fig. 1, the communication system comprises a radio access network 100, and optionally, the communication system 1000 may further comprise a core network 200 and the internet 300. The radio access network 100 may include at least one radio access network device (e.g., 110a and 110b in fig. 1) and may also include at least one terminal (e.g., 120a-120j in fig. 1). The terminal is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or may integrate the functions of the core network device and the logic functions of the radio access network device on the same physical device, or may integrate the functions of part of the core network device and part of the radio access network device on one physical device. The terminals and the radio access network device may be connected to each other by wired or wireless means. Fig. 1 is only a schematic diagram, and other network devices may be further included in the communication system, for example, a wireless relay device and a wireless backhaul device may also be included, which are not shown in fig. 1.

Illustratively, taking a communication system comprising two terminal devices as shown in fig. 2 (a), both terminal devices may be in a network coverage area. Alternatively, as shown in fig. 2 (b), one of the two terminal devices is in a network coverage area and the other is in an area without network coverage. Alternatively, as shown in fig. 2 (c), the two terminal devices may be in different network coverage areas. Alternatively, as shown in fig. 2 (d), the two terminal devices may both be in areas without network coverage.

It should be understood that, in the communication system of the present application, the information transmitting end may be a network device, or may be a terminal device, and the information receiving end may be a network device, or may be a terminal device, which is not limited in this application.

In the embodiments of the present application, the UE may be referred to as a terminal device, a terminal apparatus, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication apparatus, a user agent, or a user apparatus.

The terminal device may be a device that provides voice/data to a user, e.g., a handheld device with wireless connection, an in-vehicle device, etc. The terminal devices may include user equipment, sometimes referred to as terminals, access stations, UE stations, remote stations, wireless communication devices, or user equipment, among others. The terminal device is used for connecting people, objects, machines and the like, and can be widely used in various scenes, including but not limited to the following scenes: cellular communication, D2D, V X, machine-to-machine/machine-type communications, M2M/MTC), internet of things (internet of things, ioT), virtual Reality (VR), augmented reality (augmented reality, AR), industrial control (industrial control), unmanned driving (self driving), remote medical (remote media), smart grid (smart grid), smart furniture, smart office, smart wear, smart transportation, smart city (smart city), unmanned aerial vehicle, robotic, and other end devices. For example, the terminal device may be a mobile phone (mobile phone), a tablet pc (Pad), a computer with a wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal in industrial control, an entire car, a wireless communication module in the entire car, an on-board T-box (Telematics BOX), a road side unit RSU, a wireless terminal in unmanned driving, a smart speaker in IoT network, a wireless terminal device in telemedicine, a wireless terminal device in smart grid, a wireless terminal device in transportation security, a wireless terminal device in smart city, a wireless terminal device in smart home, or the like, which is not limited in the embodiment of the present application.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The 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 can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in cooperation with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign measurement. In addition, in the embodiment of the application, the terminal device may also be a terminal device in an IoT system, where IoT is an important component of future information technology development, and the main technical feature is to connect the article with a network through a communication technology, so as to implement man-machine interconnection and an intelligent network for interconnecting the articles.

The various terminal devices described above, if located on a vehicle (e.g., placed in a vehicle or installed in a vehicle), may be considered as in-vehicle terminal devices, also referred to as in-vehicle units (OBUs), for example. The terminal device of the present application may also be an in-vehicle module, an in-vehicle component, an in-vehicle chip, or an in-vehicle unit that is built in a vehicle as one or more components or units, and the vehicle may implement the method of the present application through the in-vehicle module, the in-vehicle component, the in-vehicle chip, or the in-vehicle unit.

It should be appreciated that the network device in the wireless communication system may be a device capable of communicating with the terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master eNodeB (MeNB), a secondary eNodeB (SeNB), a multi-mode radio (multi standard radio, MSR) node, a home base station, a network controller, an access node, a radio node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a radio remote unit (remote radio unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip for placement within the aforementioned device or apparatus. The base station may be a mobile switching center, a device that performs a base station function in D2D, V2X, M M communication, a network side device in a 6G network, a device that performs a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

In the embodiments of the present application, the functions of the base station may be performed by a module (such as a chip) in the base station, or may be performed by a control subsystem including the functions of the base station. The control subsystem comprising the base station function can be a control center in the application scenarios of smart power grids, industrial control, intelligent transportation, smart cities and the like. The functions of the terminal may be performed by a module (e.g., a chip or a modem) in the terminal, or by a device including the functions of the terminal.

For ease of understanding the present application, a simple description of the random access procedure and related concepts is provided.

1. An interface: the communication interface (Uu interface) between the terminal apparatus and the network appliance may be referred to as a Uu interface, the communication interface (PC 5 interface) between the terminal apparatus and the terminal apparatus may be referred to as a PC5 interface, and a transmission link in the PC5 interface is defined as a Sidelink (SL). The terminal device in the present application may be understood as the above-mentioned terminal device, or a part of the modules/chips in the terminal device.

2. Unlicensed band (unlicensed spectrum): in a wireless communication system, the frequency bands may be classified into an authorized frequency band and an unauthorized frequency band according to the frequency bands used. In the licensed band, users use spectrum resources based on the scheduling of the central node. In unlicensed bands, the transmitting node needs to use spectrum resources in a contention manner, specifically, contend for the channel by listen-before-talk (LBT) manner. The LBT mechanism is essentially a random back-off (random back-off) based channel access rule. The UE needs to perceive (sense) whether the channel is idle or not before accessing the channel and starting to transmit data, and can occupy the channel if the channel has remained idle for a certain time, and can occupy the channel if the channel is not idle, and needs to wait for the channel to resume to idle again. In a 5G NR system, NR protocol technologies in an unlicensed band are collectively referred to as NR-U, and further enhancement of communications performance of a corresponding Uu interface by using the NR-U is expected. SL communication that enables unlicensed bands in local space is an important evolution direction, and corresponding protocol technologies may be collectively referred to as SL-U. Similar to the Uu interface, a UE operating through SL-U also needs to coexist with nearby Wi-Fi devices based on LBT mechanisms. The LBT mechanism is an essential feature of unlicensed bands because of regulatory requirements for use of unlicensed bands in various regions of the world. UEs operating in various forms of different communication protocols can use unlicensed frequency bands only if the regulations are satisfied, and thus use spectrum resources relatively fairly and efficiently.

3. Side uplink resource allocation mode: NR SL supports two resource allocation schemes, namely mode 1 and mode 2.

Mode 1 (SL mode 1) the resources used by the network device for the sidelink transmission are allocated, mode one is typically used for sidelink communications within the coverage of the network device. Taking the dynamic scheduling of transmission resources by the network device in the mode 1 as an example, the network device performs resource allocation according to the reporting (buffer status report, BSR) condition of the buffer status of the UE. Specifically, the network device indicates time-frequency resources to UE1 through downlink control information (downlink control information, DCI), and UE1 is a UE that is a transmitting end in both communication parties. After receiving the DCI, UE1 transmits side control information (sidelink control information, SCI) and data to UE2 on the time-frequency resource indicated by the DCI, and UE2 is a UE that is a receiving end in both communication parties. In mode 1, the sidestream transmission resources of each UE are scheduled by the network device in a unified manner, so that collision can be avoided.

Mode 2 (SL mode 2) the resources used by the UE to autonomously select the side uplink transmission.

Lbt: LBT is a channel access rule. The UE needs to monitor whether the channel is idle or not before accessing the channel and starting to send data, and if the channel is idle for a certain time, the UE can occupy the channel; if the channel is not idle, the UE needs to wait for the channel to resume to idle before occupying the channel.

Energy-based detection and signal type detection may be used to determine the state of the channel, such as where the NR-U uses energy detection. A detection threshold (energy detection threshold) needs to be set based on the detection of energy, and when the detected energy exceeds the detection threshold, it is determined that the channel is busy, and access to the channel is not allowed. When the detected energy is below the detection threshold, access to the channel is allowed if after a period of time. Depending on the national and regional regulatory requirements for the use of unlicensed bands, for example, the 5GHz band, a channel may refer to a 20MHz bandwidth. The channel can be occupied by accessing a channel of 20MHz, and the requirement of at least minimum occupied channel bandwidth (occupied channel bandwidth, OCB) needs to be met, and the minimum OCB is generally at least 80% of the normal bandwidth, and the normal bandwidth is 20MHz for example, that is, the UE needs to occupy at least 16MHz bandwidth to occupy the 20MHz channel. It should be understood that the bandwidth of one channel may be other values, 20MHz being just an example and not a limitation.

LBT is of various types, two main types are described below:

first type LBT: the communication device needs to perform random backoff (random backoff) before accessing the channel and transmitting data. For example, the terminal device may perform a continuous detection (refer to as T) _d ) The first time the channel is detected to be emptyThe data transmission is initiated after the counter N is decremented to zero on the detection slot period (sensing slot duration). Immediately following T _d After which is m _p Each successive listening slot period (denoted as T _sl ). Specifically, the terminal device may access the channel according to the following steps:

step 1. Set n=n _init Wherein N is _init To be uniformly distributed between 0 and CW _p Random numbers in between, step 2 is performed, wherein CWp may be a contention window when the priority is p (contention window for a given priority class);

step 2, if N >0, the network device or the terminal device selects a down counter, and N=N-1 is taken;

step 3, if the channel during the interception time slot is idle, the step 4 is shifted to;

otherwise, go to step 5;

step 4, stopping if n=0;

otherwise, step 2 is performed.

Step 5. Listening to the channel until at another T _d In detecting that the channel is busy or detecting another T _d All listening slots in the network are detected as idle channels;

step 6. If at another T _d Detecting that the interception time slots in the channel are idle, and executing the step 4;

otherwise, step 5 is performed.

Wherein CW is _min,p ≤CW _p ≤CW _max,p ，CW _min,p To minimum value of contention window when priority is p, CW _max,p The maximum value of the contention window when the priority is p.

Selecting CW before the above step 1 _min,p And CW _max,p ，m _p 、CW _min,p And CW _max,p Is determined based on a channel access priority value p associated with the network device or terminal device transmission, as shown in table 1 or table 2:

TABLE 1 channel Access priority values and CW _p Table 1 of the relation of (2)

Table 2 relation of channel access priority values to CWp table 2

T in Table 1 and Table 2 _{m cot,p} For a maximum duration (maximum channel occupancy time for a given priority class) of channel occupancy when the priority is p, the channel occupancy time (channel occupancy time, COT) of a network device or terminal device for transmission on the channel does not exceed T _{m cot,p} In other words, COT refers to the time that a communication device is allowed to occupy a channel after successfully accessing the channel, and in other words, the communication device can preempt the usage of the channel for a period of time after completing the LBT procedure. The channel access procedure is performed based on a channel access priority value p associated with the network device or terminal device transmission, the smaller the priority value in table 1, the higher the priority, e.g. priority 1 is the highest priority.

Network device or terminal device maintains contention window value CW _p And before step 1, the CW is adjusted according to the following steps _p Is a value of (1):

for each priority in the table, CW corresponding to the priority is set _p ＝CW _min,p 。

In the feedback HARQ-ACK value corresponding to the data transmitted in the reference subframe k, if at least 80% of the data is negatively acknowledged (negative acknowledgment, NACK), the network device or terminal device will have CW corresponding to each priority _p The value is increased to the next higher allowable value, which is used in step 2; otherwise, step 1 is performed. Wherein the reference subframe k is the initial subframe of the last data transmission of the network device or the terminal device on the channel.

An example of the above-mentioned first type LBT is shown in fig. 3, where N is 6 as an example, the terminal device determines the channel at the first T by listening _d Is always in an idle state within a duration range of (a),at the first T _sl Decrementing N from 6 to 5 in the second T _sl N is decremented from 5 to 4. After that, the terminal device detects that the channel state is busy, waits for the channel state to be idle and continues for T _d After the duration of (3), at the third T _sl N is decremented to 3. After that, the terminal device again detects that the channel is busy, and waits again for the channel state to be idle for T _d After the duration of (4), at the fourth T _sl N is decremented to 2, the fifth T _sl N is decremented to 1 at a sixth T _sl Decrementing N to 0. Then, the listening channel state is idle and continues for T _d The terminal device accesses the channel and transmits data in the COT.

The second type of LBT is LBT without random back-off, and is divided into two cases:

case a: after the communication device detects that the channel is in an idle state and lasts for a period of time, the communication device can transmit data without carrying out random back-off.

Case B: the transmission is immediately after a short switching gap (switching gap), for example, the communication device transmits immediately after a switching gap from a receiving state to a transmitting state in the COT, and the time of the switching gap may be not more than 16us. The specific transition time may be preset or configured by the base station or may be related to the hardware capabilities of the communication device.

5. And (3) a resource pool: and transmitting the resource set by the side line.

A resource pool comprises a plurality of continuous sub-channels in the frequency domain, and the unit of the time domain is SL time slot. Each sub-channel contains an equal number of resource blocks (PRBs, physical resource block), and the specific value is configured on the resource pool by a higher layer. One SL slot is located within one slot (slot) in the time domain, occupies a consecutive plurality of symbols (symbols), and the start symbol position (start symbol) of the SL slot and the number of occupied continuous symbols (slsymbol length) are configured by a higher layer. The time domain starting position and the number of time duration symbols of all the SL time slots in one resource pool are the same. SL physical channels that may be transmitted over SL time slots include a side physical shared channel (Physical Sidelink Shared Channel, PSSCH), a side physical broadcast channel (Physical Sidelink Broadcast Channel, PSBCH), a side physical broadcast channel (Physical Sidelink Control Channel, PSCCH), and a side physical feedback channel (Physical Sidelink Feedback Channel, PSFCH).

The PSCCH is used to carry control information, which may be referred to as first-level sidelink control information, including physical layer resource information of the sidelink data channels, DMRS configuration information, DMRS port numbers, coded modulation signals (modulation and code signal, MCS), and resource reservation information. The resource reservation information is used for indicating the time domain position of the resource used for transmitting the PSSCH/PSCCH by the user in the future and the interval of the time slot where the current PSSCH/PSCCH is located, and the two manifestations exist in the first control information at the same time, including periodic resource reservation, primary transmission used for other TB and retransmission resource information of the current PSSCH/PSCCH. Other users can judge the use condition in the resource selection window according to the resource reservation information in the correctly received first control information in the resource listening window, such as whether a certain candidate resource in the resource selection window is reserved by other users. The allocation mode based on resource reservation can improve the reliability of resource use in the distributed system and reduce collision.

The PSSCH is used for carrying data information and second-stage sidestream control information. Wherein the data information is service information from terminal device to terminal device. The second-stage sidestream control information is mainly used for bearing other control information except PSSCH DMRS, and specifically may include information such as channel state information (channel state information, CSI) reporting trigger information, an ID of a destination user of the PSSCH, a PSSCH HARQ process number, a newly transmitted data indication (new data indicator), and a HARQ transmission version number. The format of the second-level sidestream control information is different according to different service information types. The PSSCH transmission needs to be transmitted along with its corresponding one of the PSCCHs.

In one resource pool, the number of resources occupied by the PSCCH is fixed, and the number of control information bits carried by the first-stage sidelink control information is fixed, so blind detection on the PSCCH format is not required. The PSCCH is limited to be transmitted in one sub-channel, the time domain occupies 2 to 3 symbols, the frequency domain bandwidth is smaller than or equal to one sub-channel bandwidth, the PRB number of the specific PSCCH frequency domain bandwidth is configured by a resource pool, and the frequency domain starting position is aligned with the minimum PRB index position of the sub-channel. Since the minimum frequency domain granularity of the frequency domain resource occupied by the PSSCH transmission is one sub-channel, it is possible to transmit an independent PSSCH on each sub-channel, that is, there may be a PSCCH on each sub-channel, and the terminal device needs to blindly detect the presence or absence of the PSCCH on each sub-channel. For example, one resource pool is configured with 4 sub-channels, and the PSCCH bandwidth is configured to be the same as the sub-channel bandwidth. Since the PSSCH/PSCCH may be transmitted on each subchannel, the terminal device needs to detect whether a PSCCH is present on each subchannel. In the following figure, UE-A occupies sub-channels 0 and 1 to send PSSCH/PSCCH, UE-B occupies sub-channel 2 to send PSSCH/PSCCH, sub-channel 3 is idle, and no information is sent. Then only PSCCH information on subchannel 0 and subchannel 2 is actually transmitted, no PSCCH information is present on the other subchannels, and after PSCCH is detected on subchannel 0 and subchannel 2, the terminal device decodes the PSSCH according to the first-stage side control information carried thereon to obtain the content of the second-stage side control information, and further decodes the data carried on the PSSCH.

In order to facilitate understanding of the information transmission method provided in the following embodiments of the present application, first, related concepts related to the following embodiments will be described:

the terminal device shares the COT, which can be understood as: the terminal device shares part of the time-frequency resources within the COT to other terminal devices.

The time-frequency resources within the COT may include: the time domain position is located in the COT, and the frequency domain position is located in the resource in the channel corresponding to the COT. The channel corresponding to the COT is a channel preempted (or accessed) by the terminal equipment through the LBT, and the COT is the occupied time (or using time) of the channel preempted (or accessed) by the terminal equipment.

Preempting resources: for a certain terminal device, the preempting resource refers to a time-frequency resource in the COT corresponding to the channel preempted by the terminal device.

Shared resources: for a certain terminal device, the shared resource refers to a time-frequency resource in the COT of the other terminal device shared by the other terminal device to the terminal device.

Priority information: the priority information is used to indicate priority. The priority information may have various expressions, for example, may be a priority value, or other expressions such as a sequence.

In order to solve the problem of communication reliability in a sidestream resource sharing scene on an unlicensed frequency band, the application provides a communication method, in which terminal equipment shares sidestream transmission resources according to resource reservation information, and ensures the transmission reliability of high-priority data. As shown in fig. 4, the method may include the steps of:

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

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

The first indication information includes first time-frequency resource information, wherein the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, and the first time-frequency resources are used for the second terminal device to send the first side-line information.

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

The transmission mode of the first indication information may be various, and the first indication information is physical layer side uplink control information, or media intervention control layer side uplink control information, or radio resource control layer side uplink control information. Optionally, the first indication information may be broadcast, and the first indication information may be carried on a physical sidelink feedback channel. When the first indication information is physical layer side uplink control information, the first indication information may be first order physical layer side uplink control information or second order physical layer link control information.

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

The first time-frequency resource information includes time-domain resource indication information and/or frequency-domain resource indication information. The first time-frequency resource may be understood as a time-frequency resource reserved by the second terminal apparatus. That is, when the second terminal apparatus has the first side information to be transmitted, it is desirable that the other terminal apparatuses share the first time-frequency resource, and the first instruction information is transmitted to the other terminal apparatuses on the first time-frequency resource. The first time-frequency resource information may further include indication information of the first period. The first period is a period in which the second terminal apparatus transmits side line data. The second terminal apparatus may transmit the sidestream information with the first period as a period.

The first indication information further includes first priority information for indicating a priority of the first side line information. The priority of the first side line information herein may be understood as the priority of the first side line data included in the first side line information. The first priority information is first side line information or a corresponding priority value of the first side line data. It can be understood that the priority and the priority value are two concepts, and if the priority is high, the priority value is low, or the priority and the priority value may be a forward correlation. For example, the service priority value of data a=1, the service priority value of data b=2, the priority of data a is higher than that of data B, and the importance of data a is higher than that of data B.

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

Where pre-configuration refers to obtaining parameters without networking, as one possible implementation, the pre-configured parameters may be protocol defined, or may be regulatory defined. At this time, the parameter may be preconfigured to the first terminal device at the time of shipment of the first terminal device in the form of software. And if the protocol or the regulation changes, updating the pre-configured parameters in the first terminal equipment in the form of off-line software updating. . Correspondingly, the configuration may be parameters of the access network configuration, or may be determined by the core network device. The access network device may configure the corresponding parameters to the first terminal device via radio resource control (radio resource control, RRC) signaling while the first terminal device is in the network coverage area.

The first indication information may be specifically received on a channel a in the first resource pool, where the channel a is a channel preempted by the second terminal device before the second terminal device, or where the channel a is a channel preempted by another terminal device, and the second terminal device sends the first indication information to the first terminal device by using the resource of the channel a.

The first indication information may further include a destination terminal device identifier of the first time-frequency resource, where the destination terminal device identifier may be an identifier of the first terminal device. The first terminal device confirms that the receiving end of the first side information is self according to the destination identification, and shares resources to the second terminal device. Alternatively, the destination terminal device identifier may be an identifier of another terminal device other than the first terminal device.

Alternatively, the first terminal device and the second terminal device have a transceiving relationship and the shared resource can only be used to transmit information to each other, or the first terminal device and the second terminal device are within a certain distance from each other, the shared resource may not be limited to use for transceiving each other, that is, the second terminal device needs to transmit side information to other terminal devices, and resource reservation is performed to the first terminal device within a communication range.

Optionally, the first indication information includes channel access priority information, e.g. a channel access priority value in table 1 or table 2. The channel access priority values may be p=1, p=2, p=3, p=4; the priority value of the first side information and the channel access priority value may have a correspondence, for example, a one-to-one relationship, where a channel access priority value of 1 corresponds to a priority value of 1 for the first side information and a channel access priority value of 1 corresponds to a priority value of 2 for the first side information. The relation may be one-to-many, where the priority value of channel access is 1 and corresponds to the priority value of the first side information being 1 or 2, the priority value of channel access is 2 and corresponds to the priority value of the first side information being 3 or 4, the priority value of channel access is 3 and corresponds to the priority value of the first side information being 5 or 6, and the priority value of channel access is 4 and corresponds to the priority value of the first side information being 7 or 8. The lower the channel access priority value, the higher the priority of channel access. Alternatively, the lower the channel access priority value, the lower the priority of the channel access. This scheme is also applicable for single channel only access. It is understood that when the first indication information includes channel access priority information, the first priority information may not be included any more.

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

The first terminal device acquires a channel occupation time (channel occupancy time, COT) of the first channel. The first terminal device acquires the transmission opportunity on the first channel through the LBT, and the time length for which the information can be continuously transmitted corresponding to the transmission opportunity may be referred to as the channel occupation time COT.

There are various ways for the first terminal device to perform channel access on the first channel, for example, the following ways a and B:

mode a, the first terminal device performing channel access on a first channel, includes:

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

The at least two channels belong to a first resource pool, that is, the first terminal device performs channel interception in the channels included in the first resource pool, and determines that the first channel is currently idle according to the result of the channel interception, so that the access process of the channel is completed on the first channel, and a first COT of the first channel is acquired. For example, the first resource pool includes channel a and channel B, the first terminal device performs LBT on channel a and channel B, and the counter is first backed off to 0 on channel a, so the first terminal device accesses channel a. It is to be appreciated that the first resource pool can include more than two channels.

Mode B: the first terminal device performing channel access on a first channel includes:

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

The at least two channels belong to a first resource pool, a first terminal device selects a first channel from the at least two channels in the first resource pool, monitors the first channel, determines that the first channel is idle, completes a channel access process on the first channel, and acquires a first COT of the first channel. Wherein the selection of the first channel among the at least two channels may be a random selection. For example, the first resource pool includes a channel a, a channel B, and a channel C, and the first terminal device randomly selects the channel a from three channels to perform channel interception, determines that the first channel is idle, and acquires a first COT.

It will be appreciated that step 401 may occur before step 402, i.e. the first terminal device receives the resource reservation information, i.e. the first indication information, and then performs channel access. Alternatively, step 401 and step 402 may occur simultaneously. Or step 401 may occur after step 402, but the reception instant of the first indication information is earlier than the earliest instant at which the first terminal device transmits sidestream information on the channel occupancy time of the first channel.

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

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

The second indication information may enable the second terminal device to learn that the second time-frequency resource is available, and the content and the representation manner of the second indication information may be various, for example: the second indication information is used for indicating that the second time-frequency resource is a time-frequency resource shared to the second terminal device, or the second indication information is used for indicating that the second time-frequency resource is shared to the second terminal device, or the second indication information is used for indicating that the second terminal device sends the first side-line information on the second time-frequency resource, or the second indication information can directly indicate the second time-frequency resource.

The second indication information may be transmitted in various manners, for example: the second indication information is physical layer side uplink control information, or medium intervention control layer side uplink control information, or radio resource control layer side uplink control information. Optionally, the second instruction information is first-stage side line control information, or the second instruction information is second-stage side line control information.

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

The first terminal device may determine the second time-frequency resource based on the first time-frequency resource information. Alternatively, the first terminal device determines the second time-frequency resource from the first time-frequency resource.

The time domain position of the second time-frequency resource is the same as the time domain position of the first time-frequency resource. Optionally, the number of frequency domain resources of the second time-frequency resource is the same as the number of frequency domain resources of the first time-frequency resource, i.e. the frequency domain length of the second time-frequency resource is the same as the frequency domain length of the first time-frequency resource. Optionally, the relative position of the frequency domain resource of the second time-frequency resource in the first channel is the same as the relative position of the frequency domain resource of the first time-frequency resource in the channel. In this way, the relative frequency domain position of the second time-frequency resource shared by the second terminal device is ensured to be the same as the relative frequency domain position of the reserved resource in the channel, and the reliability of the first side information transmission can be further improved.

For example, the frequency domain position of the first time domain resource in the channel is 20-30 RBs from the lowest RB of the channel, that is, the length of the frequency domain resource occupied by the first time domain resource is 10 RBs, and the distance from the lowest starting RB of the channel is 20 RBs. The length of the frequency domain resource of the second time-frequency resource is also 10 RBs. Optionally, the offset of the initial RB of the second time-frequency resource with respect to the lowest RB of the first channel is 20 RBs, i.e. the position of the frequency domain resource of the second time-frequency resource with respect to the first channel is the same as the position of the first time-domain resource in the frequency domain resource with respect to the channel in which it is located.

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

The first terminal device determines a section of frequency domain resources with the same initial position and the same RB number in the first channel as the frequency domain resources of the second time-frequency resources according to the frequency domain resource indication information, or randomly selects a section of frequency domain resources with the same RB number as the frequency domain resources of the second time-frequency resources.

And taking the time domain resource which is the same as the time domain resource occupied by the first time frequency resource as the time domain resource of the second time frequency resource, thereby determining the second time frequency resource.

The second time-frequency resource is identical to the time-domain resource of the first time-frequency resource. On this basis, the length of the frequency domain resources is the same, and the positions of the frequency domain resources with respect to the channels may be the same. The second time domain resource is a resource shared by the first terminal device to the second terminal device, so that the second terminal device can send the side line information on the same resource as the reserved resource in the time domain, the timeliness of the side line information sending of the second terminal device is ensured, and the delay of the side line information sending of the second terminal device is avoided.

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

Optionally, the channel where the first time-frequency resource is located is a first channel, where the second time-frequency resource is the same as the first time-frequency resource. That is, the first terminal apparatus shares the time-frequency resource reserved for the second terminal apparatus with the time-frequency resource reserved for the second terminal apparatus. For example, as shown in fig. 7, the first time-frequency resource indicated by the first indication information is located in a first channel, and the channel occupied by the first terminal device is the first channel. At this time, the first time-frequency resource is equal to the second time-frequency resource, i.e., the first terminal device shares the time-frequency resource reserved by the second terminal device to it.

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

The second indication information is transmitted at a time earlier than the time domain start time of the first time-frequency resource. For example, the transmission time of the second indication information is earlier than the time domain start time of the first time-frequency resource by a few symbols/slots, which are reserved processing delays. The second terminal device receives the second indication information and then uses the first side information for data processing before transmitting the first side information.

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

in the case where the priority of the information to be transmitted of the first terminal apparatus is lower than the priority of the first side information, the first terminal apparatus transmits the second instruction information to the second terminal apparatus. That is, when the priority of the sidestream information to be transmitted by the first terminal device is lower than the priority of the sidestream information of the second terminal device, the first terminal device shares the second time-frequency resource with the second terminal device and transmits the second instruction information to the second terminal device.

It will be understood that when the priority of the information to be transmitted by the first terminal device is higher than the priority of the first side information, the first terminal device preferentially transmits the side information of itself, that is, ensures transmission of the information of high priority.

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

That is, when the first time-frequency resource reserved by the second terminal apparatus is for transmitting side-line information to the first terminal apparatus, the first terminal apparatus shares the second time-frequency resource with the second terminal apparatus and receives the first side-line information from the first terminal apparatus on the second time-frequency resource. At this time, the two terminal apparatuses are one communication pair, and in this case, the performance of information transmission between the communication pair is effectively improved.

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

Alternatively, one requirement that the first terminal device may share the specified resource to the second terminal device is that the channel access priority (caps) of the first terminal device is higher than or equal to the channel access priority (caps) of the second terminal device, and the higher the channel access priority value, the lower the corresponding channel access priority.

In SL-U, the UE may select the data transmission used by the resource, and because of using the time-frequency resource of the unlicensed band, LBT needs to be executed before using the reserved resource, and because the LBT successfully accesses the channel with a certain randomness, the problem that the reserved resource is preempted by other UEs may occur, or the UE that preempts the reserved resource may not share the resource due to the transceiving constraint relationship. The scheme is used for confirming whether the service can be shared or not according to the priority comparison of reserved resources, selecting the corresponding channel to execute LBT according to the reserved condition and carrying out resource sharing, so that the probability of resource sharing on the channel can be effectively improved, the transmission guarantee of high-priority service is realized, and the competitiveness of SL-U for carrying out high-speed service transmission is improved.

The application also provides a communication method, in which the terminal equipment shares the side transmission resources according to the resource reservation information, so that the transmission reliability of the high-priority data is ensured. As shown in fig. 6, the method may include the steps of:

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

The first indication information comprises first time-frequency resource information, wherein the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, and the first time-frequency resources are used for transmitting first side-line information

The first time-frequency resource is located in a first channel, that is, the second terminal device wishes to reserve the first time-frequency resource in the first channel for sidestream information transmission. The first indication information is further used for indicating that the first time-frequency resource is located in the first channel, for example, the first time-frequency resource information in the first indication information indicates that the first time-frequency resource is located in the first channel.

The first channel is located in a first resource pool. The first resource pool includes at least two channels, the at least two channels including the first channel. The first resource pool is (pre) configured for sidestream data transmission and reception. Optionally, the first resource pool includes a transmission resource pool and a reception resource pool, and one terminal apparatus can only transmit data in one transmission resource pool, but can receive data in a plurality of reception resource pools. The same channel is not located in multiple different resource pools, and the resource usage granularity of the resource pools may be configured, or pre-configured. Optionally, the first resource pool comprises at least two channels.

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

Optionally, the first indication information is physical layer side uplink control information, or media intervention control layer side uplink control information, or radio resource control layer side uplink control information.

The first time-frequency resource information includes time-domain resource indication information and/or frequency-domain resource indication information. The first time-frequency resource may be understood as a time-frequency resource reserved by the second terminal apparatus. That is, when the second terminal apparatus has the first side information to be transmitted, it is desirable that the other terminal apparatuses share the first time-frequency resource and transmit the first instruction information to the other terminal apparatuses.

Optionally, the first indication information further includes first priority information, where the first priority information is used to indicate a priority of the first side line information. The priority of the first side line information herein may be understood as the priority of the first side line data included in the first side line information. The first priority information is first side line information or a corresponding priority value of the first side line data. It can be understood that the priority and the priority value are two concepts, and if the priority is high, the priority value is low, or the priority and the priority value may be a forward correlation. For example, the service priority value of data a=1, the service priority value of data b=2, the priority of data a is higher than that of data B, and the importance of data a is higher than that of data B.

Optionally, the first time-frequency resource information further includes indication information of the first period. The first period is a period in which the second terminal apparatus transmits side line data. The second terminal apparatus may transmit the sidestream information with the first period as a period.

Optionally, the first indication information further includes a destination terminal device identifier of the first time-frequency resource, where the destination terminal device identifier may be an identifier of the first terminal device. The first terminal device confirms that the receiving end of the first side information is self according to the destination identification, and shares resources to the second terminal device. Alternatively, the destination terminal device identifier may be an identifier of another terminal device other than the first terminal device.

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

The at least two channels belong to a first resource pool. The first terminal device selects a first channel where a first time-frequency resource is located from at least two channels in a first resource pool to carry out channel access. And after receiving the first indication information of the second terminal device, the first terminal device preferentially selects the channel where the reserved time-frequency resource is located for channel access.

In the process of accessing the channel, the first terminal device determines that the first channel is idle, acquires the channel occupation time of the first channel, and the first time-frequency resource is positioned in the channel occupation time of the first channel.

The channel occupation time of the first channel includes time domain resources of the first time-frequency resources in the time domain. I.e. the time occupied by the first terminal device on the first channel completely comprises the time domain range of the time-frequency resources reserved by the second terminal device. The first terminal device can be ensured to share all time domain resources required by the second terminal device, and the sidestream transmission reliability of the second terminal device is ensured.

Optionally, the selecting, by the first terminal device, the first channel from the at least two channels for channel access includes:

the priority of the second side information to be sent by the first terminal device is lower than that of the first side information, and the first terminal device selects a first channel from at least two channels to perform channel access.

The priority of the information to be transmitted of the first terminal device is lower than that of the first side information, and the first terminal device selects a first channel for an access process. That is, when the priority of the sidestream information to be transmitted by the first terminal device is lower than the priority of the sidestream information of the second terminal device, the first terminal device shares the first time-frequency resource with the second terminal device.

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

The second indication information is used for indicating that the first time-frequency resource is a time-frequency resource shared to the second terminal device, or the second indication information is used for indicating that the second terminal device sends the first side-line information on the first time-frequency resource, or the second indication information is used for indicating that the second terminal device uses the reserved time-frequency resource.

The second indication information is physical layer side uplink control information, or medium intervention control layer side uplink control information, or radio resource control layer side uplink control information. Optionally, the second instruction information is first-stage side line control information, or the second instruction information is second-stage side line control information.

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

As shown in fig. 5 or fig. 7, the second indication information is sent at a time n3, the first time-frequency resource corresponds to a time n4, for example, the first time-frequency resource starts at a time n4, n3 is earlier than n4 by a number of slots, or is earlier than n4 by a number of symbols, and the number of slots or symbols are used for data preparation by the second terminal device.

The second terminal device receives the second indication information, determines that the first terminal device shares the first time-frequency resource with the second terminal device, and sends the first side information on the first time-frequency resource.

Optionally, the receiver of the first side information may be the first terminal device. Alternatively, the recipient of the first side information may be another terminal device, such as a third terminal device. In this case, the second terminal apparatus reserves the side line resource for the first terminal apparatus to transmit the side line information to the third terminal apparatus.

Optionally, the method further comprises:

step S604: the first terminal device receives first side information from the second terminal device on a first time-frequency resource. In this case, the first terminal apparatus and the second terminal apparatus are one communication pair, the second terminal apparatus requests the first terminal apparatus, which is the receiving side information, for the side resources, and the first terminal apparatus shares the requested resources with the first terminal apparatus. The reliability of sidestream information transmission can be effectively improved.

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

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

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

Specifically, the first terminal device determines, according to the third indication information and the priority information in the first indication information, that the priority indicated by the priority information included in the first indication information is higher, and determines that the first channel where the sideline resource indicated in the first indication information is located carries out channel access.

The third indication information includes third time-frequency resource information and second priority information, the third time-frequency resource information indicates a third time-frequency resource of the third terminal device transmitting side line information, the third time-frequency resource is located in the second channel, and the second priority information indicates a priority of information to be transmitted of the third terminal device. The first resource pool includes at least two channels, including a first channel and a second channel.

The priority of the information to be transmitted of the third terminal device is lower than that of the first side information, and the first terminal device selects a first channel for channel access.

That is, the first terminal device receives the first instruction information of the second terminal device and the third instruction information of the third terminal device, which are both used for reserving side time-frequency resources. The first indication information indicates that the indicated resource is located in the first channel, and the third indication information indicates that the indicated resource is located in the second channel. The priority of the side line information indicated by the first priority information is higher than that of the side line information indicated by the second priority information, and the priority of the side line information to be sent by the second terminal device is higher, the first terminal device selects a first channel for channel access.

As shown in fig. 8, when the third indication information indicates that the reserved resource is located on the second channel, which may be referred to as channel 2, and the first indication information indicates that the reserved resource is located on the first channel, which may be referred to as channel 1, and the priority corresponding to the priority information carried in the third indication information is lower than the priority corresponding to the priority information carried in the first indication, the first terminal device selects the first channel from the first channel and the second channel to access, so as to preferentially ensure the transmission of the high priority side line data.

In this way, the first terminal apparatus performs channel access selection according to the priority condition of the sidestream data to be transmitted. And preferentially selecting a channel in which the side line information with high priority is positioned for channel access. The transmission reliability of the high-priority sidestream data can be guaranteed preferentially, and the transmission performance of sidestream information is improved.

Optionally, in step S602, the first terminal device selects a first channel from the at least two channels for channel access. Can be replaced by: the first terminal device selects a plurality of channels from the at least two channels for channel access, the plurality of channels including the first channel. That is, the first terminal device selects a plurality of channels in the first resource pool to perform channel access, and the first channel is finally successfully accessed.

Optionally, in step S602, if the first terminal device needs to randomly select N channels to perform channel access, the first terminal device receives resource reservation indication information of L terminal devices, where the priority indicated in the M indication information is higher than the priority of information to be sent by the first terminal device, and the first terminal device selects M channels with resource reservation in the first resource pool, and the remaining N-M channels are randomly selected in the first resource pool by excluding M channels from remaining channels in the first resource pool. By the mode, the first terminal device can preempt reserved resources corresponding to the high-priority sidestream data preferentially, and the transmission efficiency and performance of the system are improved effectively.

The application also provides a communication method 700, in which the terminal device shares the sidestream transmission resource according to the resource reservation information of the plurality of terminal devices, so that the signaling overhead of sidestream communication is saved. The method may comprise the steps of:

step 701: the at least two terminal devices send sidestream indication information to the first terminal device, wherein the sidestream indication information is used for indicating sidestream time-frequency resources reserved by the at least two terminal devices respectively.

For example, before the time slot n0, the UE-2, the UE-3 and the UE-4 respectively rob to the channel 1 and sequentially send side line indication information to the UE-1, where the side line indication information includes control information PSCCH and data information pscsch, and a first stage SCI in the PSCCH includes time-frequency resource information reserved by the UE-2, the UE-3 and the UE-4 on the channel 1, where the video resource information may indicate reserved time-domain resources, reserved frequency-domain resources and reserved periods, and service priority information of side line information to be sent on reserved time-frequency resources, and indicates priority level of sending data service;

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

For example, if the UE-1 has a service requirement arriving in the time slot n0, triggering the first terminal device to perform channel preemption; after the LBT is done in the time slot n1 by the UE-1, the UE-1 finds that the Channel1, i.e. the Channel1 Channel, is idle and successfully robs the UE to the COT of Channel 1.

The first terminal device determines that the time domain resources reserved by the UE-2, the UE-3 and the UE-4 are staggered in the time domain according to the interception result in the interception window, namely according to the time-frequency resource reservation message analyzed by the received sidestream indication information, as shown in fig. 9, the time-frequency resources are orthogonal, and determines that the priority of the sidestream information to be sent by the UE-2, the UE-3 and the UE-4 is higher than the service priority of the UE-1 according to the priority information carried in the sidestream indication information. For example, the priority values of the side line information to be sent of UE-1 are all priority=2, UE-2, UE-3, and UE-4, the lower the priority value is, the higher the priority is, i.e. UE-1 determines that the priority of the information to be sent by the three UEs is higher than the priority of its own service according to the side line information sent by UE-2, UE-3, and UE-4, and UE-1 determines to share reserved resources for UE-2, UE-3, and UE-4. Alternatively, as shown in fig. 10, similarly in the time domain, the reserved resources in the frequency domain are determined to be staggered according to the sensing result, and the UE-1 can also determine that the reserved time-frequency resources of other UEs are orthogonal, so that the shared side transmission resources to other UEs can be confirmed according to the priority condition.

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

The sharing indication information is used to indicate the side row time-frequency resources reserved by UE-2, UE-3 and UE-4. Optionally, the sharing indication information includes an ID of UE-1, i.e., includes a source ID. Further, the sharing indication information does not include the IDs of UE-2, UE-3 and UE-4, i.e., does not include the destination ID. In this way, the sharing indication can be completed by including only the ID of the first terminal apparatus to sideways resource sharing indication to UE-2, UE-3 and UE-4. And the shared indication information does not need to carry resource indication, and each UE can send information on the reserved side row resources according to the shared indication information.

After receiving the sharing indication information, the UE-2, the UE-3 and the UE-4 determine that reserved side resources can be used according to the ID information of the UE-1 carried in the sharing indication information.

The transmission time of the sharing indication information is earlier than the starting time of the earliest time-frequency resource in the time-frequency resources reserved by the UE-2, the UE-3 and the UE-4. For example, as shown in FIG. 9, UE4 reserves time-frequency resources earlier than UE-2 and UE-3. The transmission time of the shared indication information is earlier than the start time of the side line time-frequency resource reserved by the UE-4, for example, a few symbols/slots earlier than the time-domain start time of the side line time-frequency resource reserved by the UE-4, for the UE-4 to prepare for data transmission. Optionally, the sharing indication information is sent in a time slot n2, that is, the first time slot of the COT or a time slot earlier than the first time slot needing to send shared resources, and after any time slot of the time slot n1, the UE-1 sends a message to the UE-2, the UE-3 and the UE-4, where the message includes a PSCCH carrying control information and a PSCCH carrying data information, where the PSCCH carries SCI information and includes sharing indication information, but the indication information includes only a source identifier ID of the UE-1 and does not include a destination identifier ID, and indicates that the UE-2, the UE-3 and the UE-4 make the reserved resource blocks send information at a designated resource reserved position.

In the time slot n2, the UE-3 and the UE-4 receive the sharing indication information, and the Cot indication information is analyzed and determined to not contain the self ID information, so that the UE-2, the UE-3 and the UE-4 determine the self reservation information to obtain the sharing confirmation of the Ue-1;

after time slot n2, UE-3 and UE-4 transmit information using reserved time-frequency resources at a specific time according to the reservation information.

Under the resource reservation mechanism, a plurality of UEs can reserve on the same channel on the same time slot with different frequency domain granularities, when resources are shared, if all reserved resources are indicated by independent IDs, larger resource expenditure is caused.

In addition to the above data transmission method, the present application also provides a related description of a SL resource pool (hereinafter referred to simply as a resource pool) in an unlicensed band. This will be described below.

Optionally, the resource pool comprises at least one channel. Illustratively, as shown in fig. 11, the resource pool #1 may include 4 channels.

The bandwidth of each channel in the resource pool may be, for example, 20 megahertz (MHz). Of course, the bandwidth of the channel may also be other values, which are not particularly limited in this application.

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

Alternatively, the channel may be divided into a plurality of sub-channels. The size of the sub-channels may be, for example: 10. 12, 15, 20, 25, 50, 75 or 100 physical resource blocks (physical resource block, PRB). Wherein PRBs included in a subchannel may be contiguous or may be interleaved (interleaved).

For example, when PRBs included in a subchannel are interleaved PRBs, a subchannel M, M e {0,1, … M-1} may be defined, and the index of PRBs included in the subchannel M may be { M, m+m,2m+m, 3m+m. Where M is a constant, and its value may be determined by the subcarrier spacing.

Illustratively, as shown in fig. 12, fig. 12 (a) shows an example in which staggered PRBs are included in a subchannel. Fig. 12 (b) shows an example in which consecutive PRBs are included in a sub-channel.

Alternatively, for a certain channel, a guard (guard) PRB may be included in the channel, where the guard PRB is not used for data/signaling transmission. PRBs other than the guard PRBs may constitute a common (common) PRB set. The subchannels may be partitioned based on common PRB sets. In this application, unless specifically stated otherwise, RBs refer to PRBs, and thus, descriptions of RBs and PRBs may be interchanged.

For a resource pool comprising a plurality of channels, the sub-channels comprised by different channels may be numbered consecutively. For example, channel #1 includes sub-channels numbered 1 through 10, channel #2 may have sub-channel numbers 11 through 20, channel #3 may have sub-channel numbers 21 through 30, and so on.

In addition, if the terminal device uses multiple sub-channels in the channel to transmit simultaneously, the multiple sub-channels may be continuous sub-channels or discontinuous sub-channels, which is not specifically limited in this application.

Alternatively, the PRBs in a subchannel may be contiguous when the resource pool is (pre) configured to disable the inter PRBs. When the resource pool is (pre) configured to allow the use of interleaved PRBs, the PRBs in the sub-channels may be interleaved.

Alternatively, the terminal device may perform LBT on at least one channel of the resource pool before transmitting data. After the preempting channel acquires the COT, transmission can be performed with the sub-channel as granularity. For example, after the terminal device preempts a channel, it may transmit on at least one subchannel of that channel. Alternatively, when the resource pool is (pre) configured to disable the inter PRB, if the terminal device uses multiple subchannels in the channel for transmission, the PSCCH may be located on a subchannel with the smallest index of the multiple subchannels, or may be located on a subchannel with the lowest frequency of the multiple subchannels. Furthermore, the PSCCH is located within the same sub-channel in each transmission within the COT.

The resource pool is (pre) configured to allow use of the interleaved PRBs, if the terminal device uses multiple sub-channels within the channel for transmission, the PSCCH may be located on the lowest indexed sub-channel of the multiple sub-channels or may be located on the lowest frequency sub-channel of the multiple sub-channels. In addition, the time domain start position of the PSCCH is the same as or aligned with the time domain start position of the resource pool. In each transmission within the COT, the PSCCH is located within the same subchannel.

Illustratively, taking the example of the terminal device transmitting using two sub-channels, as shown in fig. 13 (a), the terminal device selects consecutive sub-channels (sub-channel #1 and sub-channel # 2) for transmission, where the PSCCH is located in sub-channel #1. As shown in fig. 13 (b), it is indicated that the terminal device selects discontinuous sub-channels (sub-channel #1 and sub-channel # 11) for transmission, wherein the PSCCH is located in sub-channel #1.

Based on the design of the PSCCH and the PSSCH, the PSCCH can be configured in one sub-channel, and the terminal equipment only needs to perform blind decoding on the PSCCH in the specific sub-channel, so that the power consumption of the terminal equipment can be reduced.

Optionally, the resource pool is not used for transmitting periodic side-uplink synchronization signals and physical broadcast channel (physical broadcast channel, PBCH) blocks (sidelink synchronization signal and PBCH block, S-SSB), i.e. periodic S-SSB is arranged outside the resource pool. If the S-SSB is transmitted on the resources in the resource pool, there may be a case that the terminal device needs to simultaneously receive the PSCCH/PSSCH when transmitting the S-SSB, and at this time, the S-SSB may fail to transmit because the terminal device is a half duplex device. In addition, the slot structure of the S-SSB is different from that of the PSCCH/PSSCH, which increases the implementation complexity of the terminal device if the S-SSB is transmitted on resources in the resource pool, and the resources in the resource pool are dynamically preempted (or allocated) and are not suitable for periodic S-SSB transmission. That is, the periodic S-SSB is configured outside the resource pool, so that the transmission of the S-SSB is ensured, and the implementation complexity of the terminal equipment is reduced.

Alternatively, the time domain resources (or time domain locations) of the resource pool may be indicated by a configuration bit map (bitmap). For example, the bit map may include N bits, each of the N bits may correspond to at least one time unit, and all time units corresponding to the N bits are consecutive. When the value of a certain bit is equal to 1 (or 0), the time unit corresponding to the bit can be used for SL transmission, or the time domain resource of the resource pool comprises the time unit corresponding to the bit; when the value of a certain bit is equal to 0 (or 1), the time unit corresponding to the bit is indicated not to be used for SL transmission, or the time domain resource of the resource pool does not include the time unit corresponding to the bit.

Illustratively, the time units may be slots, orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols, subframes, frames, etc., which are not specifically limited in this application.

For SL-U, each bit in the bit map may be configured to be 1 (or 0), which indicates that the time unit corresponding to each bit may be used for SL transmission. If a bit has a value of 0 (or 1) in the bit map, which indicates that the time unit corresponding to the bit is not used for SL transmission, the time domain resources in the resource pool are discontinuous, which may cause the terminal device to fail to maintain the COT on the channel in the unlicensed band. Therefore, each bit in the bit map is set to 1 (or 0), so that the terminal equipment can maintain COT on a channel in an unlicensed frequency band, and data transmission is realized.

Optionally, there may be reserved (reserved) slots in the SL resource pool of the licensed band, where the reserved slots are slots determined to ensure that the remaining slot resources are integer multiples of the bitmap length after the mode2 resource awareness mechanism is used to exclude the unavailable slot resources. In the SL resource pool of the unlicensed band, if each bit in the bit map is configured to be 1 (or 0), the reservation time unit is not included (or not present) in the resource pool.

Alternatively, the transmission in the methods shown in fig. 4 to 10 may be performed with sub-channel granularity.

Fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device 1400 may be a terminal device in fig. 2, or a first terminal device and a second terminal device in fig. 4 and fig. 6, for implementing the method for a terminal device in the above method embodiment. Specific functions can be seen from the description of the method embodiments described above.

The communication device 1400 includes one or more processors 1401. The processor 1401 may also be referred to as a processing unit and may implement certain control functions. The processor 1401 may be a general purpose processor or a special purpose processor, etc. For example, it includes: a baseband processor, a central processing unit, an application processor, a modem processor, a graphics processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, and/or a neural network processor, etc. The baseband processor may be used to process communication protocols as well as communication data. The central processor may be used to control the communication device 1400, execute software programs, and/or process data. The different processors may be separate devices or may be integrated in one or more processors, e.g., integrated on one or more application specific integrated circuits.

Optionally, the communication device 1400 includes one or more memories 1402 for storing instructions 1404 that can be executed on the processor to cause the communication device 1400 to perform the methods described in the method embodiments above. Optionally, the memory 1402 may also store data therein. The processor and the memory may be provided separately or may be integrated.

Alternatively, the communication device 1400 may include instructions 1403 (sometimes also referred to as code or program), which instructions 1403 may be executed on the processor, causing the communication device 1400 to perform the methods described in the above embodiments. The processor 1401 may store data therein.

Optionally, the communication device 1400 may also include a transceiver 1405 and an antenna 1406. The transceiver 1405 may be referred to as a transceiver unit, a transceiver circuit, a transceiver, an input-output interface, etc. for implementing the transceiver function of the communication device 1400 through the antenna 1406.

Optionally, the communication device 1400 may also include one or more of the following: wireless communication modules, audio modules, external memory interfaces, internal memory, universal serial bus (universal serial bus, USB) interfaces, power management modules, antennas, speakers, microphones, input/output modules, sensor modules, motors, cameras, or displays, among others. It is to be appreciated that in some embodiments, the UE 1400 may include more or fewer components, or some components may be integrated, or some components may be split. These components may be hardware, software, or a combination of software and hardware implementations.

The processor 1401 and transceiver 1405 described in this application may be implemented on an integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit (radio frequency identification, RFID), mixed signal IC, application specific integrated circuit (application specific integrated circuit, ASIC), printed circuit board (printed circuit board, PCB), or electronic device, among others. The communication apparatus described herein may be implemented as a stand-alone device (e.g., a stand-alone integrated circuit, a mobile phone, etc.), or may be part of a larger device (e.g., a module that may be embedded in another device), and reference may be made specifically to the foregoing description of the terminal device and the network device, which is not repeated herein.

The embodiment of the present application provides a terminal device (referred to as UE for convenience of description) that may be used in the foregoing embodiments. The terminal device comprises corresponding means, units and/or circuits to implement the UE functionality described in the embodiments shown in fig. 1, fig. 2, fig. 4 and/or fig. 6. For example, the terminal device includes a transceiver module for supporting the terminal device to implement the transceiver function, and a processing module for supporting the terminal device to process the signal.

Fig. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

The terminal device 1500 may be adapted for use in the system shown in fig. 1 and 2. For convenience of explanation, fig. 13 shows only main components of the terminal apparatus 1500. As shown in fig. 13, the terminal apparatus 1500 includes a processor, a memory, a control circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the whole terminal device 1500, executing software programs, and processing data of the software programs. The memory is mainly used for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices such as touch screens, display screens, microphones, keyboards, etc. are mainly used for receiving data input by a user and outputting data to the user.

Taking the terminal device 1500 as a mobile phone for example, after the terminal device 1500 is turned on, the processor may read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data is required to be transmitted wirelessly, the processor carries out baseband processing on the data to be transmitted and then outputs a baseband signal to the control circuit, and the control circuit carries out radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device 1500, the control circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that for ease of illustration, only one memory and processor is shown in fig. 15. In some embodiments, terminal device 1500 can include multiple processors and memory. The memory may also be referred to as a storage medium or storage device, etc., and embodiments of the present application are not limited in this regard.

As an alternative implementation, the processor may include a baseband processor, which is mainly used to process the communication protocol and the communication data, and a central processor, which is mainly used to control the entire terminal device 1500, execute a software program, and process the data of the software program. The processor in fig. 13 integrates the functions of a baseband processor and a central processing unit, and those skilled in the art will appreciate that the baseband processor and the central processing unit may be separate processors, interconnected by bus technology, etc. Terminal device 1500 may include multiple baseband processors to accommodate different network formats, terminal device 1500 may include multiple central processors to enhance its processing capabilities, and the various components of terminal device 1500 may be connected via various buses. The baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, which is executed by the processor to realize the baseband processing function.

In one example, the antenna and the control circuit having a transmitting and receiving function may be regarded as the transmitting and receiving unit 1510 of the terminal device 1500, and the processor having a processing function may be regarded as the processing unit 1520 of the terminal device 1500. As shown in fig. 13, the terminal apparatus 1500 includes a transceiving unit 1510 and a processing unit 1520. The transceiver unit may also be referred to as a transceiver, transceiver device, etc. Alternatively, a device for implementing a receiving function in the transceiver 1510 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver 1510 may be regarded as a transmitting unit, i.e., the transceiver 1510 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitting circuit, etc.

The transceiving unit may be configured to perform transceiving actions performed by the terminal device in the embodiment corresponding to fig. 4 and 6. For example, the first terminal device includes a transceiver unit configured to receive the first instruction information from the second terminal device, and a processing unit configured to perform channel access on the first channel by the first terminal device, and the transceiver unit is further configured to transmit the second instruction information to the second terminal device by the first terminal device. Optionally, the transceiver unit is further configured to receive the first side information from the second terminal device on the second time-frequency resource. Correspondingly, the second terminal device also comprises a transceiver unit and a processing unit for performing the respective actions of fig. 4, 6 and the communication method 700.

Those of ordinary skill in the art will appreciate that the elements and steps of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or contributing part or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The foregoing computer-readable storage media can be any available media that can be accessed by a computer. Taking this as an example but not limited to: the computer readable medium may include random access memory (random access memory, RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (electrically erasable programmable read only memory, EEPROM), compact disc read-only memory (compact disc read-only memory, CD-ROM), universal serial bus flash disk (universal serial bus flash disk), a removable hard disk, or other optical disk storage, magnetic disk storage media, or other magnetic storage device, or 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. In addition, by way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), or direct memory bus RAM (DR RAM).

The foregoing is merely specific embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art may easily think about changes or substitutions within the technical scope of the embodiments of the present application, and the changes or substitutions are intended to be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. An indication information transmitting method, comprising:

the method comprises the steps that a first terminal device receives first indication information from a second terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, and the first priority information is used for indicating priority of the first side-line information;

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

and under the condition that the priority of the information to be sent of the first terminal device is lower than the priority of the first side information, the first terminal device sends second indication information to the second terminal device on the first channel, wherein the second indication information is used for indicating that second time-frequency resources in the channel occupation time of the first channel are time-frequency resources shared to the second terminal device, and the time-frequency resources are the same as the time-domain position of the first time-frequency resources.

2. The method according to claim 1, wherein the method further comprises:

the first terminal device determines the frequency domain position of the second time-frequency resource in the first channel according to the first time-frequency resource information.

3. A method according to claim 1 or 2, characterized in that,

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

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

And the first terminal device selects the first channel of at least two channels to perform channel interception, determines that the first channel is idle, and performs channel access on the first channel.

4. A method according to any one of claims 1 to 3, wherein,

the first time-frequency resource is located in the first channel, and the second time-frequency resource is identical to the first time-frequency resource; or alternatively

The first time-frequency resource is located in a second channel, and the second time-frequency resource is located in the first channel.

5. The method according to any one of claims 1-4, further comprising:

The first terminal device receives the first side information from the second terminal device on the second time-frequency resource.

6. The method according to any one of claims 1 to 5, wherein,

and the sending time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

7. The method according to any one of claims 1 to 6, wherein,

the first indication information is physical layer side uplink control information, or media intervention control layer side uplink control information, or radio resource control layer side uplink control information.

8. The method for transmitting the sidestream information is characterized by comprising the following steps:

the method comprises the steps that a second terminal device sends first indication information to a first terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, and the first priority information is used for indicating priority of the first side-line information;

the second terminal device receives second indication information from the first terminal device, wherein the second indication information is used for indicating that second time-frequency resources in channel occupation time of a first channel are time-frequency resources shared to the second terminal device, and the time-domain positions of the second time-frequency resources and the first time-frequency resources are the same;

And the second terminal device sends the first side information on the second time-frequency resource.

9. The method of claim 8, wherein the second terminal device transmitting the first side-line information on the second time-frequency resource comprises:

the second terminal device sends the first side information to the first terminal device on the second time-frequency resource; or alternatively

And the second terminal device sends the first side information to a third terminal device on the second time-frequency resource.

10. The method according to claim 8 or 9, wherein,

The first time-frequency resource is located in a second channel, and the second time-frequency resource is located in a first channel.

11. The method according to any one of claims 8-10, wherein,

the receiving time of the second indication information is earlier than the time domain starting time of the first time-frequency resource.

12. The method according to any one of claims 8-11, wherein,

13. A method of communication, comprising:

the method comprises the steps that a first terminal device receives first indication information from a second terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, the first time-frequency resources are located in a first channel, and the first priority information is used for indicating priority of the first side-line information;

and under the condition that the priority of the second side line information to be sent by the first terminal device is lower than that of the first side line information, the first terminal device selects the first channel from at least two channels to carry out channel access.

14. The method of claim 13, wherein the method further comprises:

in the process of accessing the channel, the first terminal device determines that the first channel is idle;

the first terminal device sends second indication information to the second terminal device, wherein the second indication information is used for indicating that the first time-frequency resource is a time-frequency resource shared to the second terminal device, and the first time-frequency resource is located in the channel occupation time of the first channel.

15. The method according to claim 13 or 14, characterized in that the method further comprises:

the first terminal device receives the first side information from the second terminal device on the first time-frequency resource.

16. The method according to any one of claims 13-15, wherein,

17. The method according to any of claims 13-16, wherein the first terminal device, prior to selecting the first channel of at least two channels for channel access, further comprises:

the first terminal device receives third indication information from a third terminal device, the third indication information comprises second time-frequency resource information and second priority information, the second time-frequency resource information is used for indicating third time-frequency resources reserved by the third terminal device, the third time-frequency resources are used for sending third side-line information, the third time-frequency resources are located in a second channel, the second priority information is used for indicating the priority of the third side-line information, the at least two channels further comprise the second channel, and the priority of the third side-line information is lower than that of the first side-line information.

18. The method according to any one of claims 13-17, wherein,

19. A method of communication, comprising:

the second terminal device sends first indication information to the first terminal device, wherein the first indication information comprises first time-frequency resource information and first priority information, the first time-frequency resource information is used for indicating first time-frequency resources reserved by the second terminal device, the first time-frequency resources are used for sending first side-line information, the first time-frequency resources are located in a first channel, and the first priority information is used for indicating priority of the first side-line information;

the second terminal device receives second indication information from the first terminal device, wherein the second indication information is used for enabling the first time-frequency resource to be a time-frequency resource shared to the second terminal device;

and the second terminal device sends the first side-line information on the first time-frequency resource.

20. The method of claim 19, wherein the second terminal device transmitting the first side-line information on the first time-frequency resource comprises:

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

The second terminal device sends the first side information to a third terminal device on the first time-frequency resource.

21. The method according to claim 19 or 20, wherein,

the first time-frequency resource is located in the channel occupation time of the first channel, and the channel occupation time of the first channel is acquired by the first terminal device.

22. The method according to any one of claims 19-21, wherein,

23. The method according to any one of claims 19-22, wherein,

24. A communication device, the communication device comprising a processor; the processor being configured to execute a computer program or instructions to cause the communication device to perform the method of any one of claims 1-7, or to cause the communication device to perform the method of any one of claims 8-12, or to cause the communication device to perform the method of any one of claims 13-18, or to cause the communication device to perform the method of any one of claims 19-23.

25. A computer readable storage medium storing computer instructions or a program which, when run on a computer, cause the method of any one of claims 1-7 to be performed, or cause the communication device to perform the method of any one of claims 8-12, or cause the communication device to perform the method of any one of claims 13-18, or cause the communication device to perform the method of any one of claims 19-23.

26. A computer program product, the computer program product comprising computer instructions; when part or all of the computer instructions are executed on a computer, the method of any of claims 1-7 is caused to be performed, or the method of any of claims 8-12 is caused to be performed, or the method of any of claims 13-18 is caused to be performed, or the method of any of claims 19-23 is caused to be performed, by the communication device.