WO2023065364A1

WO2023065364A1 - Wireless communication method and terminal device

Info

Publication number: WO2023065364A1
Application number: PCT/CN2021/125913
Authority: WO
Inventors: 王昊; 丁伊
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2023-04-27
Also published as: CN117751645A

Abstract

Provided in the embodiments of the present application are a wireless communication method and a terminal device, which can achieve resource selection or resource reselection on an unlicensed spectrum. The method comprises: insofar as a first condition is met, a terminal device performing resource selection or resource reselection, wherein the first condition is related to at least one of the following: information of the number of times the terminal device fails in executing listen before talk (LBT); the number of cycles in which the terminal device does not perform semi-persistent transmission; the remaining delay budget of a service to be transmitted of the terminal device; the number of unused resources among selected resources of the terminal device; a channel busy ratio (CBR), which is obtained by the terminal device by means of measurement; and the priority of said service of the terminal device.

Description

Method and terminal device for wireless communication

technical field

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

Background technique

In the Internet of Vehicles system, the terminal device may randomly select transmission resources from the resource pool, or the terminal device may select transmission resources from the resource pool according to the interception result.

On the unlicensed spectrum, all communication devices need to perform Listen Before Talk (LBT) before sending signals. That is, before a communication device transmits a signal on an unlicensed spectrum channel, it needs to perform channel monitoring first, and only when the channel monitoring result shows that the channel is idle, the communication device can perform signal transmission.

When the sidewalk system is deployed on the unlicensed spectrum, the terminal device needs to perform LBT monitoring channel status before using the selected resources to send data. Only when the monitoring result shows that the channel is idle, the terminal device can send signals on the unlicensed frequency band. However, there may be multiple technologies coexisting in the unlicensed frequency band, and there may be multiple interferences. Therefore, how to select or reselect resources on the unlicensed frequency band is an urgent problem to be solved.

Contents of the invention

Embodiments of the present application provide a wireless communication method and a terminal device, which can implement resource selection or resource reselection on unlicensed spectrum.

In a first aspect, a wireless communication method is provided, including: when a first condition is met, a terminal device performs resource selection or resource reselection, where the first condition is related to at least one of the following: Information on the number of times the terminal device fails to perform LBT; the number of periods in which the terminal device does not perform semi-persistent transmission; the remaining delay budget of the service to be transmitted by the terminal device; the selected resources of the terminal device The quantity of unused resources; the channel congestion rate CBR measured by the terminal device; the priority of the service to be transmitted by the terminal device.

A second aspect provides a terminal device configured to execute the method in the foregoing first aspect or any possible implementation manner of the first aspect. Specifically, the terminal device includes a unit configured to execute the method in the foregoing first aspect or any possible implementation manner of the first aspect.

In a third aspect, a terminal device is provided, and the terminal device includes: a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above first aspect or its various implementations.

In a fourth aspect, a chip is provided for implementing the method in the above first aspect or various implementation manners thereof.

Specifically, the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the method in the above first aspect or its various implementations.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program, and the computer program causes a computer to execute the method in the above-mentioned first aspect or each implementation manner thereof.

In a sixth aspect, a computer program product is provided, including computer program instructions, where the computer program instructions cause a computer to execute the method in the above first aspect or various implementation manners thereof.

In a seventh aspect, a computer program is provided, which, when running on a computer, causes the computer to execute the method in the above first aspect or various implementations thereof.

Based on the above technical solution, a terminal device operating in an unlicensed frequency band can perform resource selection or resource reselection when the first condition is met, wherein the first condition is related to at least one of the following: the terminal Information about the number of times the device fails to perform LBT; the number of periods in which the terminal device does not perform semi-persistent transmission; the remaining delay budget of the service to be transmitted by the terminal device; the selected resources of the terminal device are not used The number of resources; the channel congestion rate CBR measured by the terminal device; the priority of the service to be transmitted by the terminal device, so as to realize resource selection or reselection on the unlicensed spectrum.

Description of drawings

FIG. 1 is a schematic diagram of a communication system architecture applied in an embodiment of the present application.

Fig. 2 is a schematic diagram of uplink communication within a network coverage provided by the present application.

Fig. 3 is a schematic diagram of partial network coverage side communication provided by the present application.

Fig. 4 is a schematic diagram of outbound communication provided by the network coverage provided by the present application.

FIG. 5 is a schematic diagram of a physical layer structure in an NR V2X system provided by the present application.

Fig. 6 is a schematic diagram of a resource reservation manner provided by the present application.

Fig. 7 is a schematic diagram of resource selection provided by the present application.

Fig. 8 is a schematic diagram of another resource selection provided by the present application.

Fig. 9 is a schematic diagram of data transmission on an unlicensed spectrum provided by the present application.

Fig. 10 is a schematic flowchart of a wireless communication method provided according to an embodiment of the present application.

Fig. 11 is a schematic diagram of a resource selection method according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a resource selection method according to another embodiment of the present application.

Fig. 13 is a schematic block diagram of a terminal device provided according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of a communication device provided according to an embodiment of the present application.

Fig. 15 is a schematic block diagram of a chip provided according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. With regard to the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The technical solution of the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) on unlicensed spectrum unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, the number of connections supported by traditional communication systems is limited and easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application may also be applied to these communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, may also be applied to a dual connectivity (Dual Connectivity, DC) scenario, and may also be applied to an independent (Standalone, SA) deployment Web scene.

Optionally, the communication system in the embodiment of the present application may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; or, the communication system in the embodiment of the present application may also be applied to a licensed spectrum, where, Licensed spectrum can also be considered as non-shared spectrum.

The embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, wherein the terminal equipment may also be referred to as user equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

The terminal device can be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, next-generation communication systems such as terminal devices in NR networks, or future Terminal equipment in the evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In the embodiment of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites) superior).

In this embodiment of the application, the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal Equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home.

As an example but not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.

In the embodiment of the present application, the network device may be a device for communicating with the mobile device, and the network device may be an access point (Access Point, AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA , or a base station (NodeB, NB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network A network device or a base station (gNB) in a network device or a network device in a future evolved PLMN network or a network device in an NTN network.

As an example but not a limitation, in this embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network equipment may be a satellite or a balloon station. For example, the satellite can be a low earth orbit (low earth orbit, LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous earth orbit (geosynchronous earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite. ) Satellite etc. Optionally, the network device may also be a base station installed on land, water, and other locations.

In this embodiment of the present application, the network device may provide services for a cell, and the terminal device communicates with the network device through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device ( For example, a cell corresponding to a base station), the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (Small cell), and the small cell here may include: a metro cell (Metro cell), a micro cell (Micro cell), a pico cell ( Pico cell), Femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third" and "fourth" in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

It should be understood that the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.

In this embodiment of the application, "predefined" or "preconfigured" can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). The application does not limit its specific implementation. For example, pre-defined may refer to defined in the protocol.

In the embodiment of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems, which is not limited in the present application.

Fig. 1 is a schematic diagram of a communication system to which the embodiment of the present application is applicable. The vehicle-mounted terminals (vehicle-mounted terminal 131 and vehicle-mounted terminal 132 ) autonomously select transmission resources on sidelink resources for data transmission. Optionally, the vehicle-mounted terminal may select transmission resources randomly, or select transmission resources by listening.

In some embodiments, in side communication, according to the network coverage of the communicating terminal, it can be divided into network coverage inner communication, as shown in FIG. 2; partial network coverage side communication, as shown in FIG. and network coverage outside the line communication, as shown in Figure 4.

Figure 2: In network coverage inner line communication, all terminals performing side line communication are within the coverage of the same base station. Therefore, the above terminals can perform side line based on the same side line configuration by receiving configuration signaling from the base station communication.

Figure 3: In the case of partial network coverage for sidelink communication, some terminals performing sidelink communication are located within the coverage of the base station. These terminals can receive configuration signaling from the base station and perform sidelink communication according to the configuration of the base station. However, terminals located outside the network coverage cannot receive the configuration signaling from the base station. In this case, the terminals outside the network coverage will use the pre-configuration information and the physical The information carried in the Physical Sidelink Broadcast Channel (PSBCH) determines the sidelink configuration for sidelink communication.

Figure 4: For outbound communication under network coverage, all terminals performing side communication are located outside the network coverage, and all terminals determine side communication according to pre-configuration information to perform side communication.

Device-to-device communication is a sidelink (Sidelink, SL) transmission technology based on Device to Device (D2D), which is different from the way communication data is received or sent by the base station in traditional cellular systems, so it has Higher spectral efficiency and lower transmission delay. The Internet of Vehicles system adopts the method of terminal-to-terminal direct communication, and two transmission modes are defined in 3GPP, which are respectively recorded as: mode A and mode B. This embodiment of the present application can be applied to mode B.

Mode A: The transmission resources of the terminal are allocated by the base station, and the terminal sends data on the sidelink according to the resources allocated by the base station; the base station can allocate resources for a single transmission to the terminal, and can also allocate resources for semi-static transmission to the terminal resource. As shown in FIG. 2 above, the terminal is located within the coverage of the network, and the network allocates transmission resources for sidelink transmission to the terminal.

Mode B: the terminal selects a resource from the resource pool for data transmission. As shown in Figure 4 above, the terminal is located outside the coverage of the cell, and the terminal independently selects transmission resources from the pre-configured resource pool for sidelink transmission; or, as shown in Figure 2 above, the terminal independently selects transmission resources from the resource pool configured by the network. The transmission resource is used for sideline transmission.

The NR V2X system can adopt the physical layer structure shown in Figure 5.

Among them, the Physical Sidelink Control Channel (PSCCH) is used to carry the first sidelink control information, and the Physical Sidelink Shared Channel (PSSCH) is used to carry the transmission data and the second sidelink control information. PSCCH and PSSCH are multiplexed and sent in the same slot. The first sideline control information is carried in the PSCCH, and mainly includes domains related to resource sensing, which are used for resource exclusion and resource selection by other terminals after decoding. In addition to the data, the PSSCH also carries the second sideline control information. The second sideline control information mainly includes fields related to data demodulation, and is used for the receiving terminal to demodulate the data carried in the PSSCH associated with the PSCCH.

To facilitate a better understanding of the embodiments of the present application, the resource reservation related to the present application will be described.

In the NR V2X system, in the above mode B, the terminal device selects resources to send data by itself. The resource reservation is a prerequisite for the terminal device to perform resource selection.

Resource reservation means that the terminal reserves selected time-frequency resources in the first sidelink control information carried by the PSCCH. In NR V2X, both resource reservation within a Transport Block (TB) and inter-TB resource reservation are supported.

As shown in Figure 6. The terminal device sends the first sideline control information, using the time domain resource assignment (Time resource assignment) field and the frequency domain resource assignment (Frequency resource assignment) field to indicate the N time-frequency resources used for the current TB transmission (including the The time-frequency resource of the second transmission). Wherein, N≤Nmax, optionally, Nmax is equal to 2 or 3. At the same time, the above N indicated time-frequency resources are distributed in W time slots. Optionally, W is equal to 32.

For example, for TB1 in Figure 6, the terminal device sends the first sidelink control information in the PSCCH while sending the initial transmission data on the PSSCH, and uses the above two fields to indicate the time-frequency resources used for the initial transmission and retransmission 1 of TB1 The location (that is, N=2 at this time), that is, the time-frequency resource for retransmission 1 is reserved. Moreover, the time-frequency resources used for the initial transmission and the retransmission 1 are distributed in 32 time slots in the time domain. Similarly, in Figure 6, for TB 1, the terminal device uses the first sideline control information sent in the PSCCH of retransmission 1 to indicate the time-frequency resources used for retransmission 1 and retransmission 2, for retransmission 1 and retransmission 2 The time-frequency resources for retransmission 2 are distributed in 32 time slots in the time domain.

In some scenarios, the terminal device may also use a resource reservation period (Resource reservation period) field to perform inter-TB resource reservation when sending the first sideline control information. For example, in Figure 6, when the terminal device sends the first sideline control information of the initial transmission of TB 1, it uses the "Time resource assignment" field and the "Frequency resource assignment" field to indicate the time-frequency resources of the initial transmission and retransmission 1 of TB 1 Position, denoted as {(t1,f1),(t2,f2)}. Among them, t1 and t2 represent the time domain positions of the resources used for the initial transmission and retransmission 1 of TB 1, and f1 and f2 represent the corresponding frequency domain positions. If the value of the "Resource reservation period" field in the first sideline control information is 100 milliseconds, then the first sideline control information also indicates the time-frequency resource {(t1+100,f1),(t2+100 ,f2)}, these two resources are used for the initial transmission of TB 2 and the transmission of retransmission 1. Similarly, the first lateral control information sent in retransmission 1 of TB 1 can also use the "Resource reservation period" field to reserve time-frequency resources for retransmission 1 and retransmission 2 of TB 2.

In the NR V2X system, the possible values of the "Resource reservation period" field are 0, 1-99, 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000 milliseconds. Compared with the LTE V2X system, it is more to be flexible. However, in each resource pool, only e values are configured, and the terminal device determines possible values according to the used resource pool. Note that the value of e in the resource pool configuration is the resource reservation period set M, for example, e is less than or equal to 16.

Optionally, the resource reservation between TBs may be configured to be activated or deactivated in units of resource pools through network configuration or pre-configuration. For example, when the inter-TB resource reservation is deactivated, the "Resource reservation period" field is not included in the first side line control information. In general, before resource reselection is triggered, the value of the "Resource reservation period" field used by the terminal device, that is, the resource reservation period will not change, and the terminal device will use it every time it sends the first side line control information. The "Resource reservation period" field in the "Resource reservation period" field reserves the resources of the next period for the transmission of another TB, so as to achieve periodic semi-persistent transmission.

When the terminal device works in mode B, the terminal device can obtain the first sidelink control information sent by other terminals by listening to the PSCCH sent by other terminals, so as to know the resources reserved by other terminals. When the terminal device selects resources, it can exclude the resources reserved by other terminals, so as to avoid resource collision.

To facilitate a better understanding of the embodiments of the present application, the method of resource selection related to the present application will be described.

In the NR V2X system, in the above mode B, the terminal device selects resources to send data by itself.

As shown in FIG. 7 , the terminal device triggers resource selection or reselection at time slot n. Wherein, time slot n is a time slot for the high layer of the terminal device to trigger the physical layer of the terminal device to report the candidate resource set. The resource selection window starts from n+T1 and ends at n+T2. Wherein, 0<=T1<=T _proc,1 , when the subcarrier spacing is 15, 30, 60, 120 kHz, T _proc,1 is 3, 5, 9, 17 time slots respectively. T2 _min <=T2<=remaining delay budget of the service, the value set of T2 _min is {1,5,10,20}*2 ^μ time slots, where μ=0, 1, 2, 3 correspond to When the subcarrier spacing is 15, 30, 60, or 120 kHz, the terminal device determines T2 _min from the value set according to the priority of the data to be sent. For example, when the subcarrier spacing is 15 kHz, the terminal device determines T2 _min from the set {1, 5, 10, 20} according to the priority of the data to be sent. When T2 _min is greater than or equal to the remaining delay budget of the service, it is determined that T2 is equal to the remaining delay budget of the service. The remaining delay budget of the service is the difference between the corresponding time required by the data delay and the current time. For example, for a data packet arriving at time slot n, the delay requirement is 50 milliseconds, assuming that a time slot is 1 millisecond, if the current time is time slot n, then the remaining delay budget of the data packet is 50 milliseconds, if the current time is time slot n+20, then the remaining delay budget of the data packet is 30 milliseconds.

The terminal device performs resource monitoring from n-T0 to nT _proc,0 , and the value of T0 is, for example, 100 or 1100 milliseconds. When the subcarrier spacing is 15, 30, 60, 120 kHz, T _proc,0 is 1, 1, 2, 4 time slots. In practical applications, the terminal device will listen to the first sidelink control information sent by other terminals in each time slot (except its own transmission time slot). When the terminal device triggers resource selection or reselection in time slot n, the terminal The device listens to the result using n-T0 to nT _proc,0 resources.

Resource selection in mode B can be performed in the following two steps:

Step 1: The terminal takes all candidate available resources belonging to the resource pool used by the terminal in the resource selection window as a resource set A, and any candidate resource in the resource set A is recorded as R(x, y), and x and y respectively indicate the frequency of the resource. domain location and time domain location. Note that the initial quantity of resources in resource set A is M _total . The terminal device excludes the resources in the resource set A according to the unlistened time slots in the resource listening window (step 1-1) and/or the resource listening results in the resource listening window (step 1-2). The terminal device judges whether the resource R(x, y) or a series of periodic resources corresponding to the resource R(x, y) is the same as the time slot determined according to the unlistened time slot in step 1-1 or according to the time slot in step 1-2 The resources determined by the intercepted first side line control information overlap, and if they overlap, the resource R(x,y) is excluded from the resource set A.

Step 1-1:

If the terminal device sends data in the time slot m in the listening window and does not listen, the terminal device will use the resource reservation period according to the time slot m and each allowed resource reservation period in the resource pool used by the terminal. For the interval, determine the corresponding one or more time slots. If resource R(x,y) or a series of resources corresponding to resource R(x,y) overlap with the time slot determined according to the allowed resource reservation period, resource R(x,y) is excluded from resource set A ).

For example, as shown in Figure 7, the terminal device does not listen in time slot m, and performs resource exclusion according to each resource reservation period in the resource reservation period set M in the resource pool configuration used by the terminal device. For example, for resource reservation In period 1, one or more time slots determined are two time slots marked with horizontal lines at intervals of resource reservation period 1 mapped from time slot m in FIG. 7 . For the resource reservation period 2, the determined one or more time slots are the time slots marked with dotted fills at intervals of the resource reservation period 2 mapped from the time slot m in FIG. 7 . If the resource R(x,y) or a series of periodic resources corresponding to the resource R(x,y) overlap with the time slot determined according to any one of the

resource reservation periods

1 and 2, then from the resource set A resource R(x,y) is excluded from A.

Optionally, when the resource pool used by the terminal device deactivates the inter-TB reservation, the terminal device may not perform the above step 1-1.

Optionally, after step 1-1 is performed, the remaining resources in resource set A are less than Mtotal*X, then resource set A is initialized to all available resources in the resource selection window belonging to the resource pool used by the terminal, and then step 1- 2.

Step 1-2: If the terminal device detects the first sidelink control information transmitted in the PSCCH within the time slot m in the listening window, measure the channel quality of the PSCCH (Sidelink Reference Signal Received Power (Sidelink Reference Signal Received Power) Receiving Power, SL-RSRP) or, the SL-RSRP of the PSSCH scheduled by the PSCCH (that is, the SL-RSRP of the associated PSSCH sent in the same time slot as the PSCCH).

If the measured SL-RSRP is greater than the SL-RSRP threshold, and the resource pool used by the terminal device activates resource reservation between TBs, the terminal device will reserve resources according to time slot m and the detected first sideline control information. The resource reservation period is used as an interval to determine one or more corresponding time slots. The terminal device assumes that the first sidelink control information with the same content is also received in the one or more time slots. The terminal device shall determine the first sidelink control information received in time slot m and the resources indicated by the "Time resource assignment" field and the "Frequency resource assignment" field of one or more first sidelink control information of these presumed received first sidelink control information Whether the resource R(x,y) or a series of periodic resources corresponding to the resource R(x,y) overlap, and if so, exclude the corresponding resource R(x,y) from the resource set A.

For example, as shown in Figure 8, when the resource pool used by the terminal device activates the reservation between TBs, if the terminal device detects the first side row control information in the PSCCH on the time slot m resource E(v,m), the first side row The resource reservation period in the control information is Prx, and the time slot determined according to the resource reservation period and time slot m is time slot m+Prx. Side row control information. The terminal device will determine the

resources

1, 2, and 3 indicated by the "Time resource assignment" field and the "Frequency resource assignment" field of the first sideline control information received at time slot m and assumed to be received at time slot m+Prx , 4, 5, 6 overlap with resource R(x, y) or a series of periodic resources corresponding to resource R(x, y), if they overlap and meet the RSRP condition, then exclude resource R from resource set A ( x, y).

If the SL-RSRP measured by the terminal device is greater than the SL-RSRP threshold, and the resource pool used by the terminal device deactivates resource reservation between TBs, the terminal device only judges the "Time Whether the resources indicated by the "resource assignment" field and the "Frequency resource assignment" field overlap with the resource R(x,y) or a series of resources corresponding to the resource R(x,y); if they overlap, exclude the resource from the resource set A R(x,y).

For example, in Figure 8, when the resource pool used by the terminal device deactivates the reservation between TBs, if the terminal device detects the first sideline control information in the PSCCH on the time slot m resource E(v, m), the terminal device Judging the

resources

1, 2, and 3 indicated by the "Time resource assignment" field and the "Frequency resource assignment" field in the first side line control information correspond to the resource R(x,y) or the resource R(x,y) Whether the series of periodic resources overlap. If they overlap and meet the RSRP condition, then exclude the resource R(x,y) from the resource set A.

If the remaining resources in resource set A are less than Mtotal*X after the above resource exclusion, raise the SL-RSRP threshold by 3dB, and perform step 1 again. Further, the physical layer of the terminal device reports the resource set A after resource exclusion as a candidate resource set to a high layer of the terminal device.

Step 2: The upper layer of the terminal device randomly selects a resource from the reported candidate resource set to send data. That is, the terminal device randomly selects a resource from the candidate resource set to send data.

Optionally, the above SL-RSRP threshold is determined by the priority P1 carried in the PSCCH sensed by the terminal device and the priority P2 of the data to be sent by the terminal device.

Optionally, whether the terminal device uses the measured RSRP of the PSCCH or the RSRP of the PSSCH scheduled by the PSCCH to compare with the SL-RSRP threshold may be determined according to the resource pool configuration of the resource pool used by the terminal device. Wherein, the resource pool configuration may be network configuration or pre-configuration.

Optionally, the above possible values of X may include but not limited to {20%, 35%, 50%}. The resource pool configuration of the resource pool used by the terminal device may include a corresponding relationship between priorities and values of X, and the terminal device determines the value of X according to the priorities of the data to be sent and the corresponding relationship. Wherein, the resource pool configuration may be configured or pre-configured by the network.

The unlicensed spectrum is the spectrum allocated by the country and region that can be used for radio device communication. This spectrum is usually considered a shared spectrum, that is, communication devices in different communication systems can be used as long as they meet the regulatory requirements set by the country or region on the spectrum. To use this spectrum, there is no need to apply to the government for exclusive spectrum authorization. For example, the WIFI system is deployed on the unlicensed spectrum, and the LTE system and the NR system can also work on the unlicensed spectrum through the LTE-U and NR-U technologies respectively.

As shown in Figure 9, the terminal device works in the unlicensed frequency band. Before the terminal device uses the selected resource to transmit data, it needs to perform LBT to monitor the channel. Only when the LBT is successful, that is, the channel is idle, the terminal device can access the unlicensed frequency band. transfer data. If the result of performing LBT is that the channel is not idle, the terminal device cannot access the unlicensed frequency band to use the selected resource.

FIG. 10 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG. 10 , the wireless communication method 200 may include at least part of the following:

S210. When the first condition is met, the terminal device performs resource selection or resource reselection, where the first condition is related to at least one of the following:

Information about the number of times the terminal device failed to execute the LBT of listening first and then speaking;

The number of periods in which the terminal device did not perform semi-persistent transmission;

The remaining delay budget of the service to be transmitted of the terminal equipment;

the number of unused resources among the selected resources of the terminal device;

Channel Busy Ratio (CBR) measured by terminal equipment;

The priority of the service to be transmitted by the terminal device.

In some embodiments of the present application, the terminal device works in an unlicensed frequency band.

That is to say, in this embodiment of the application, a terminal device working in an unlicensed frequency band can select resources that are not in the selected resources according to the number of failed LBT execution cycles, the number of cycles without semi-persistent transmission, and the remaining delay budget of the service to be transmitted. The amount of used resources, at least one of the CBR and the priority of the service to be transmitted, determine whether to trigger resource selection or reselection.

In some embodiments of the present application, the number of LBT failures counted by the terminal device may be continuous LBT failures, or may be discontinuous LBT failures, which is not limited in the present application.

In some embodiments of the present application, the fact that the terminal device does not perform semi-persistent transmission may refer to that within a semi-persistent transmission period, the terminal device does not use any time-frequency resource in the period to transmit data.

Optionally, the semi-persistent transmission period may refer to the aforementioned resource reservation period.

It should be understood that the embodiment of the present application does not limit the reason why the terminal device does not perform semi-persistent transmission, for example, it may include but not limited to: there is no data to be transmitted in the semi-persistent transmission period and/or LBT failure.

For example, the number of periods in which an end device is not conducting semi-persistent transmissions may include:

the number of cycles without semi-persistent transfers due to no data to be transferred; and/or

Number of cycles without semi-persistent transmission due to LBT failure.

In some embodiments of the present application, the number of cycles that the terminal device does not perform semi-persistent transmission may be continuous, or may also be discontinuous, which is not limited in the present application.

In some embodiments of the present application, the selected resource of the terminal device may be the resource selected through step 1 and step 2 in the foregoing embodiments. Before the terminal device uses the selected resource to transmit data, it needs to execute the LBT monitoring channel first. When the channel is idle, the selected resources are used to transmit data.

In some embodiments of the present application, the unused resources among the selected resources of the terminal device may refer to unused resources caused by any reason. For example, it may include, but not limited to, resources that have not been attempted to be accessed (that is, LBT has not been performed to access the resource), and/or unused resources due to LBT failure. In the following embodiments, the unused resources among the selected resources of the terminal device are resources not attempted to be accessed as an example for illustration, but the present application is not limited thereto.

It should be understood that the information on the number of LBT failures can reflect the usage of the current channel. When the terminal device determines whether to trigger resource selection or resource reselection, referring to the information on the number of LBT failures is beneficial to ensure that the terminal device performs resource selection or resource reselection in a timely manner. , to avoid transmission failure.

For example, multiple LBT failures may be caused by conflicts among selected resources of multiple terminal devices. In this case, triggering resource selection or resource reselection helps to avoid the problem of data transmission failure.

The number of cycles that the terminal device does not perform semi-persistent transmission may be related to LBT failure. When the terminal device determines whether to trigger resource selection or resource reselection, referring to the number of cycles that does not perform semi-persistent transmission is also conducive to avoiding data transmission failures. question.

When the terminal device determines whether to trigger resource selection or resource reselection, referring to the remaining delay budget of the service to be transmitted will help ensure that there is enough time for resource selection or reselection before sending data to avoid transmission failure.

CBR can reflect the current load level of the system, or the collective use of channels by users in the system. Therefore, when the terminal device determines whether to trigger resource selection or resource reselection, referring to CBR is helpful to avoid the problem of data transmission failure.

When the terminal device determines whether to trigger resource selection or resource reselection, referring to the priority of the data to be transmitted is beneficial to ensure that the terminal device guarantees timely transmission of high-priority services.

In some embodiments of the present application, the first condition includes at least one of the following:

The number of times the terminal device fails to perform LBT is greater than or equal to a first threshold;

The number of periods in which the terminal device does not perform semi-persistent transmission is greater than or equal to a second threshold;

The remaining delay budget of the service to be transmitted of the terminal device is greater than or equal to a third threshold;

The number of unused resources among the selected resources of the terminal device is less than or equal to a fourth threshold;

The channel congestion rate CBR measured by the terminal device is less than or equal to the fifth threshold;

The priority of the service to be transmitted of the terminal device is higher than or equal to the sixth threshold.

In some embodiments, the terminal device may count the number of failed LBT executions based on the first counter.

As an implementation manner, the initial value of the first counter is set to zero, and when the terminal device fails to execute the LBT, the count value of the first counter is increased by one.

Optionally, when the count value of the first counter reaches the first threshold, the terminal device triggers resource selection or resource reselection.

As another implementation manner, the initial value of the first counter is set as the first threshold, and when the terminal device fails to execute the LBT, the count value of the first counter is decreased by one.

Optionally, when the count value of the first counter is equal to 0, the terminal device triggers resource selection or resource reselection.

It should be understood that the number of failed LBT executions of the terminal device counted by the first counter may be continuous or discontinuous. For example, only the number of consecutive LBT failures can be counted, and if the LBT is successful, the first counter is reset. For another example, no matter whether it is continuous or not, as long as the execution of LBT fails, it will be counted.

In some embodiments, the first counter is reset when at least one of the following conditions is met:

The number of times the terminal device fails to perform LBT reaches a first threshold;

The terminal device performs resource selection or resource reselection.

Here, resource selection or resource reselection by the terminal device may be triggered when the number of LBT failures reaches the first threshold, or may be triggered by other conditions, which is not limited in this application.

In some embodiments, the first threshold is configured by the network device, or is predefined, or is pre-configured, or the first threshold may be determined by the terminal device, for example, according to the priority of the service to be transmitted.

For example, the first threshold may be configured by the network device through any downlink signaling or downlink information, for example, it may include but not limited to: Radio Resource Control (Radio Resource Control, RRC) signaling, media access control control element (Media Access Control Control Element, MAC CE) signaling, downlink control information (Downlink Control Information, DCI).

In some embodiments, the terminal device may count the number of periods in which the terminal device does not perform semi-persistent transmission based on the second counter.

As an implementation manner, the initial value of the second counter is set to zero, and if the terminal device does not perform semi-persistent transmission within one semi-persistent transmission period, the count value of the second counter is increased by one.

Optionally, when the count value of the second counter reaches the second threshold, the terminal device triggers resource selection or resource reselection.

As another implementation manner, the initial value of the second counter is set as the second threshold, and if the terminal device does not perform semi-persistent transmission within one semi-persistent transmission period, the count value of the second counter is decremented by one.

Optionally, when the count value of the second counter is equal to 0, resource selection or resource reselection is triggered.

It should be understood that the number of periods in which the terminal device does not perform semi-persistent transmission counted by the second counter may be continuous, or may also be discontinuous. For example, only the periods in which the semi-persistent transmission is not performed continuously can be counted, and if the terminal device performs the semi-persistent transmission within one semi-persistent transmission period, the second counter is reset. For another example, regardless of whether it is continuous or not, as long as it is a period in which the terminal device does not perform semi-persistent transmission, it will be counted.

In some embodiments, the second counter is reset when at least one of the following conditions is met:

The number of periods in which the terminal device does not perform semi-persistent transmission reaches a second threshold;

The terminal device performs resource selection or resource reselection.

Here, resource selection or resource reselection by the terminal device may be triggered when the number of cycles without semi-persistent transmission reaches the second threshold, or may be triggered by other conditions, which is not limited in this application.

In some embodiments, the second threshold is configured by the network device, or pre-configured, or predefined, or the second threshold is determined by the terminal device, for example, according to the priority of the service to be transmitted.

For example, the second threshold may be configured by the network device through any downlink signaling or downlink information, which may include but not limited to: RRC signaling, MAC CE signaling, and DCI. In some embodiments, the remaining delay budget of the service to be transmitted by the terminal device is greater than or equal to the third threshold, which can be understood as: the remaining delay budget is sufficient, indicating that the service to be transmitted can still wait for a period of time, leaving enough time for the terminal device Perform resource selection or reselection, and then send data.

In some embodiments, the third threshold is configured by the network device, or is preconfigured, or is predefined, or the third threshold is determined by the terminal device, for example, according to the priority of the service to be transmitted.

For example, the third threshold may be configured by the network device through any downlink signaling or downlink information, such as may include but not limited to: RRC signaling, MAC CE signaling, and DCI.

In some embodiments, if the number of unused resources among the selected resources of the terminal device is less than or equal to the fourth threshold, it may be understood that the unused resources are not enough to transmit the service to be transmitted. In this case, resource selection or resource reselection is triggered. , which is beneficial to ensure the reliable transmission of the service to be transmitted.

In some embodiments, the fourth threshold is configured by the network device, or pre-configured, or predefined, or the fourth threshold is determined by the terminal device, for example, according to the priority of the service to be transmitted.

For example, the fourth threshold may be configured by the network device through any downlink signaling or downlink information, for example, it may include but not limited to: RRC signaling, MAC CE signaling, and DCI.

In some embodiments, if the CBR measured by the terminal device is less than or equal to the fifth threshold, it can be understood that the current load level of the system is low. In this case, resource selection or resource reselection is triggered, and further based on the selected or reselected resources. transmission, which is beneficial to avoid transmission failure. When the CBR exceeds the threshold, it indicates that the system load level is high, and resource reselection and transmission may cause more congestion in the system and affect system performance.

In some embodiments, the fifth threshold is configured by the network device, or is pre-configured, or predefined, or the fifth threshold is determined according to the priority of the service to be transmitted.

For example, the fifth threshold may be configured by the network device through any downlink signaling or downlink information, such as may include but not limited to: RRC signaling, MAC CE signaling, and DCI.

In some embodiments, when the priority of the service to be transmitted by the terminal device is higher than or equal to the sixth threshold, it may be understood that the priority of the service to be transmitted is higher. In this case, resource selection or resource reselection is triggered, and further based on selection or Reselected resources are used for transmission, which helps ensure reliable transmission of high-priority services.

In some embodiments, the sixth threshold is configured by the network device, or pre-configured, or predefined, or the sixth threshold is determined by the terminal device, for example, according to the priority of the service to be transmitted.

For example, the sixth threshold may be configured by the network device through any downlink signaling or downlink information, for example, it may include but not limited to: RRC signaling, MAC CE signaling, and DCI.

It should be understood that the first condition may include one of the above conditions, or a combination of at least two conditions.

Example 1: The terminal device triggers resource selection or resource reselection when the following conditions are met:

The number of times the terminal device fails to perform LBT is greater than or equal to the first threshold.

Example 2: The terminal device triggers resource selection or resource reselection when the following conditions are met:

The number of periods in which the terminal device does not perform semi-persistent transmission is greater than or equal to the second threshold.

Example 3: The terminal device triggers resource selection or resource reselection when the following conditions are met:

The number of times the terminal device fails to perform LBT is greater than or equal to the first threshold:

The remaining delay budget of the service to be transmitted of the terminal device is greater than or equal to the third threshold.

Example 4: The terminal device triggers resource selection or resource reselection when the following conditions are met:

Example 5: The terminal device triggers resource selection or resource reselection when the following conditions are met:

The number of times the terminal device fails to perform LBT is greater than or equal to the first threshold;

The number of unused resources among the selected resources of the terminal device is less than or equal to the fourth threshold;

In some embodiments of the present application, the terminal device performs resource selection or resource reselection, including:

The terminal device determines a candidate resource set within the resource selection window;

In the candidate resource set, resource selection or resource reselection is performed.

In some embodiments, when resource selection or resource reselection is triggered, the terminal device can determine the resource selection window in the manner in the foregoing embodiments, and further determine the candidate resource set based on step 1 in the foregoing embodiments. For a specific implementation process, refer to For the sake of brevity, the relevant descriptions of the foregoing embodiments are not repeated here.

It should be understood that in the embodiment of the present application, the terminal device may directly determine the target resource for the service to be transmitted in the candidate resource set regardless of the unused resources among the selected resources, or may also target the unused resources Perform resource reselection, for example, partial reselection or full reselection, etc. This application does not limit the specific resource selection method.

The specific implementation of resource selection or resource reselection according to the embodiments of the present application will be described below in combination with specific embodiments.

Embodiment 1: Resource selection is performed in the candidate resource set for the resource for which the terminal device LBT fails to access.

In some embodiments, for resources for which the terminal device fails to access LBT, X resources are selected from the candidate resource set, where X is less than or equal to K, and K is the threshold of times the terminal device fails to perform LBT.

Optionally, when the number of times the terminal device fails to perform LBT reaches the number threshold, resource selection or resource reselection is triggered. That is, K may be the aforementioned first threshold.

As an implementation manner, the terminal device may randomly select X resources from the candidate resource set.

Further, the terminal device may transmit services to be transmitted on the X resources.

Embodiment 2: For the unused resources among the selected resources of the terminal device, resource reselection is performed in the candidate resource set.

Embodiment 2-1: when performing resource reselection for unused resources among the selected resources of the terminal device, it may be partial reselection, or may be full reselection.

Embodiment 2-2: When performing resource reselection for unused resources among the selected resources of the terminal device, resource reselection may also be performed according to whether the unused resources are included in the candidate resource set.

As an example, resource reselection is performed in the candidate resource set for unused resources that are not included in the candidate resource set.

In this case, the target resources obtained through resource reselection may include: unused resources included in the candidate resource set, and reselected resources in the candidate resource set.

As another example, resource reselection is performed among candidate resource sets for all unused resources.

In this case, the target resources obtained through resource reselection may include: reselected resources in the candidate resource set.

Embodiment 2-3: When resource reselection is performed on unused resources among the selected resources of the terminal device, resource reselection may also be performed according to whether the unused resources have been indicated by side traffic control information. The side row control information here may correspond to the above first side row control information.

For example, according to whether the unused resources have been indicated by the side traffic control information, the unused resources can be divided into: the first type of unused resources and the second type of unused resources, wherein the first type of unused resources are not Indicated by the lateral control information, the second type of unused resource has been indicated by the lateral control information.

Implementation: 2-3-1: For the first type of unused resources among the selected resources of the terminal device, perform resource reselection in the candidate resource set.

It should be understood that when performing resource reselection for the first type of unused resources among the selected resources of the terminal device, it may be a partial reselection, or it may be a full reselection, or it may also be based on the first type of unused resources. Whether the resource is included in the candidate resource set, resource reselection is performed, and the present application is not limited thereto.

As an example, resource reselection is performed on resources not included in the candidate resource set in the first type of unused resources.

In this case, the target resources obtained through resource reselection may include: the second type of unused resources, the first type of unused resources included in the candidate resource set, and the reselected resources in the candidate resource set .

As another example, for all unused resources of the first type, resource reselection is performed in the candidate resource set.

In this case, the target resources obtained through resource reselection include: unused resources of the second type and reselected resources in the candidate resource set.

Embodiment 2-3-2: For the second type of unused resources among the selected resources of the terminal device, resource reselection is performed in the candidate resource set.

It should be understood that when reselecting resources of the second type of unused resources among the selected resources of the terminal device, it may be partial reselection, or may be full reselection, or may also be based on the second type of unused resources. Whether the resource is included in the candidate resource set, resource reselection is performed, and the present application is not limited thereto.

As an example, resource reselection is performed on resources not included in the candidate resource set in the second type of unused resources.

In this case, the target resources obtained through resource reselection may include: the first type of unused resources, the second type of unused resources included in the candidate resource set, and the reselected resources in the candidate resource set .

As another example, for all unused resources of the second type, resource reselection is performed in the candidate resource set.

In this case, the target resources obtained through resource reselection may include: unused resources of the first type and reselected resources in the candidate resource set.

Optionally, this embodiment 2 may be applicable to resource selection or resource reselection triggered by one or more of the following conditions: the number of times the terminal device fails to perform LBT is greater than or equal to the first threshold;

The remaining delay budget of the service to be transmitted of the terminal device is greater than or equal to the third threshold;

In some embodiments, for the resource selection or resource reselection triggered by the terminal device not performing semi-persistent transmission period greater than or equal to the second threshold, the terminal device may perform resource selection based on step 1 and step 2 in the foregoing embodiments, The specific implementation process will not be repeated here.

In the following, resource selection or resource reselection methods according to the embodiments of the present application will be described with reference to the specific examples shown in FIG. 11 and FIG. 12 .

In FIG. 11 , the trigger condition of resource selection or resource reselection is the foregoing example 1, and the first threshold is 3 as an example for illustration.

As shown in Figure 11, the terminal device performs resource selection or resource reselection on time slot n, and the resources w, x, y, z, v, and u are the time-frequency resources selected by the terminal device in time slot n, that is, resource w , x, y, z, v, and u are selected resources, where resource y is located in time slot m. Since the terminal device works in an unlicensed frequency band, before using the above-mentioned selected resources to transmit data, the terminal device needs to perform LBT to monitor the channel status. When the monitored channel is idle, the terminal device can use the resource to send data.

As shown in Figure 11, the terminal device fails to execute LBT before using resources w, x, and y, and fails to use resources w, x, and y to transmit data. Optionally, the failure of the terminal device to execute LBT can be continuous or non- Continuous (for example, one LBT succeeds in the middle of two LBT failures), at this time, the number k of failures of the terminal device to perform LBT is equal to 3, that is, equal to the first threshold.

At time unit p, the terminal device determines that the first condition is satisfied, then the terminal device triggers resource selection or resource reselection, and performs the steps of determining the resource listening window and resource selection window in the foregoing embodiments, and step 1, that is, the terminal device All candidate resources in the resource selection window are excluded to obtain a candidate resource set. Further, the terminal device performs resource selection or resource reselection in the candidate resource set.

Optionally, the time unit may be a time slot, or may also be another time unit, which is not limited in this application.

Optionally, the time unit p may be a time slot m, or may also be other time slots.

Way 1: The terminal device may determine q time-frequency resources in the candidate resource set.

Exemplarily, q is smaller than the first threshold, that is, q≤3, for example, the value of q may be 0, 1, 2, or 3.

Optionally, the q time-frequency resources may be randomly selected by the terminal device from the candidate resource set.

Optionally, the q time-frequency resources are reselected resources for one or more resources selected for LBT access failure.

Mode 2: Resource reselection is performed for resources that have not been attempted to be accessed among the selected resources of the terminal device.

Wherein, the resources not attempted to be accessed are located after the time unit p, for example including resources z, v, u.

Mode 2-1: For resources that are not attempted to be accessed, perform resource reselection on one or more resources.

For example, resource reselection is performed in the candidate resource set for all resources that are not attempted to be accessed.

For another example, resource reselection is performed on resources not included in the set of candidate resources among the resources that are not attempted to be accessed.

Way 2-2: For the first type of unattended access resources (that is, resources not indicated by the sidelink control information among the unattended access resources), perform resource reselection on one or more of the resources.

For example, resource reselection is performed in the candidate resource set for all resources of the first type that are not attempted to be accessed.

For another example, resource reselection is performed on resources not included in the candidate resource set in the first type of unattended access resources.

Way 2-3: For the second type of unattended access resources (that is, among the unattended access resources indicated by the sidelink control information), resource reselection is performed on one or more of the resources.

For example, resource reselection is performed in the candidate resource set for all resources of the second type that are not attempted to be accessed.

For another example, resource reselection is performed on resources not included in the candidate resource set in the second type of unattended access resources.

In FIG. 12 , the trigger condition of resource selection or resource reselection is the aforementioned example 2, and the second threshold is 3 as an example for illustration. In sidelink communication, before resource reselection, the terminal device can reserve the transmission resources of the next TB for each TB sent in a fixed period, and use the reserved resources for transmission, so as to realize periodic semi-persistent transmission. As shown in Figure 12, the terminal device reserves resources for TB2 transmission when it plans to perform TB1 transmission, and reserves resources for TB3 transmission when it performs TB2 transmission, where TB 1, TB 2, and TB 3 are half of the terminal equipment's resources. Continuous transmission.

In the cycle of TB1, the cycle of TB2, and the cycle of TB3, the terminal device does not transmit. In the time unit p, the number of cycles that the terminal device does not perform semi-persistent transmission reaches the second threshold, that is, 3, and the terminal device triggers Resource selection or reselection. For example, the terminal device can perform resource selection based on step 1 and step 2 in the foregoing embodiments, and the specific implementation will not be repeated here.

Optionally, the time unit p may be a time slot p, or is related to the processing delay of the terminal device, or is determined by a high layer of the terminal device.

In summary, a terminal device working in an unlicensed frequency band can perform LBT failure times, the number of cycles without semi-persistent transmission, the remaining delay budget of the service to be transmitted, the number of unused resources in the selected resources, CBR and At least one item in the priority of the service to be transmitted determines whether to trigger resource selection or reselection. Further, at least one of the number of LBT failures, the number of periods of non-semi-persistent transmission, the remaining delay budget of the service to be transmitted, the number of unused resources among the selected resources, and the priority of the CBR and the service to be transmitted When a preset condition is met, resource selection or resource reselection is performed, so that resource selection or resource reselection on unlicensed spectrum can be realized.

The method embodiment of the present application is described in detail above with reference to FIG. 10 to FIG. 12 , and the device embodiment of the present application is described in detail below in conjunction with FIG. 13 to FIG. 15 . It should be understood that the device embodiment and the method embodiment correspond to each other, similar to The description can refer to the method embodiment.

Fig. 13 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. As shown in Figure 13, the terminal device 400 includes:

A processing unit 410, configured to perform resource selection or resource reselection when a first condition is met, where the first condition is related to at least one of the following:

Information about the number of times that the terminal device fails to execute the LBT of listening first;

The number of periods during which the terminal device does not perform semi-persistent transmission;

The remaining delay budget of the service to be transmitted of the terminal device;

The channel congestion rate CBR measured by the terminal device;

The priority of the service to be transmitted of the terminal device.

In some embodiments of the present application, the processing unit 410 is further configured to:

According to the first counter, determine the number of times that the terminal device fails to perform LBT.

When at least one of the following conditions is met, the first counter is reset:

The number of times the terminal device fails to perform LBT reaches the first threshold;

The terminal device performs resource selection or resource reselection.

According to the second counter, determine the number of periods in which the terminal device does not perform semi-persistent transmission.

When at least one of the following conditions is met, the second counter is reset:

The number of periods in which the terminal device does not perform semi-persistent transmission reaches the second threshold;

The terminal device performs resource selection or resource reselection.

determining a set of candidate resources within a resource selection window;

In the set of candidate resources, resource selection or resource reselection is performed.

For the resources for which the terminal device LBT fails to access, resource selection is performed in the candidate resource set.

In some embodiments of the present application, the processing unit is also used for:

For resources for which the terminal device fails to access LBT, select X resources from the candidate resource set, where X is less than or equal to K, and K is a threshold of times the terminal device fails to perform LBT.

In some embodiments of the present application, the X resources are randomly selected from the candidate resource set.

In some embodiments of the present application, the processing unit 410 is further configured to: perform resource reselection in the candidate resource set for unused resources among the selected resources of the terminal device.

performing resource reselection in the set of candidate resources for resources not included in the set of candidate resources among the unused resources; or

For all unused resources, resource reselection is performed in the set of candidate resources.

For the first type of unused resources among the selected resources of the terminal device, perform resource reselection in the candidate resource set, where the first type of unused resources are unused resources among the unused resources The resources indicated by the side traffic control information.

performing resource reselection for resources not included in the set of candidate resources in the first type of unused resources; or

For all unused resources of the first type, resource reselection is performed in the set of candidate resources.

For the second type of unused resources among the selected resources of the terminal device, perform resource reselection in the set of candidate resources, where the second type of unused resources are among the unused resources resources that have been indicated by sideline control information.

performing resource reselection for resources not included in the set of candidate resources in the second type of unused resources; or

For all unused resources of the second type, resource reselection is performed in the set of candidate resources.

In some embodiments, the above-mentioned communication unit may be a communication interface or a transceiver, or an input-output interface of a communication chip or a system-on-chip. The aforementioned processing unit may be one or more processors.

It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the terminal device 400 are for realizing the method shown in FIG. 10 For the sake of brevity, the corresponding process of the terminal device in 200 will not be repeated here.

FIG. 14 is a schematic structural diagram of a communication device 500 provided in an embodiment of the present application. The communication device 500 shown in FIG. 14 includes a processor 510, and the processor 510 can invoke and run a computer program from a memory, so as to implement the method in the embodiment of the present application.

In some embodiments, as shown in FIG. 15 , the communication device 500 may further include a memory 520 . Wherein, the processor 510 can invoke and run a computer program from the memory 520, so as to implement the method in the embodiment of the present application.

Wherein, the memory 520 may be an independent device independent of the processor 510 , or may be integrated in the processor 510 .

In some embodiments, as shown in FIG. 15 , the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices, specifically, to send information or data to other devices, or Receive messages or data from other devices.

Wherein, the transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include antennas, and the number of antennas may be one or more.

In some embodiments, the communication device 500 may specifically be the terminal device in the embodiment of the present application, and the communication device 500 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, the Let me repeat.

Fig. 15 is a schematic structural diagram of a device according to an embodiment of the present application. The chip 600 shown in FIG. 15 includes a processor 610, and the processor 610 can call and run a computer program from a memory, so as to implement the method in the embodiment of the present application.

In some embodiments, as shown in FIG. 16 , the chip 600 may further include a memory 620 . Wherein, the processor 610 can invoke and run a computer program from the memory 620, so as to implement the method in the embodiment of the present application.

Wherein, the memory 620 may be an independent device independent of the processor 610 , or may be integrated in the processor 610 .

In some embodiments, the chip 600 may further include an input interface 630 . Wherein, the processor 610 can control the input interface 630 to communicate with other devices or chips, specifically, can obtain information or data sent by other devices or chips.

In some embodiments, the chip 600 may further include an output interface 640 . Wherein, the processor 610 can control the output interface 640 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.

In some embodiments, the device can be applied to the terminal device in the embodiment of the present application, and the device can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, details are not repeated here.

In some embodiments, the device mentioned in the embodiment of the present application may also be a chip. For example, it may be a system-on-a-chip, a system-on-a-chip, a system-on-a-chip, or a system-on-a-chip.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other available Program logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash. The volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (Static RAM, SRAM), Dynamic Random Access Memory (Dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM ) and Direct Memory Bus Random Access Memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

It should be understood that the above-mentioned memory is illustrative but not restrictive. For example, the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is, the memory in the embodiments of the present application is intended to include, but not be limited to, these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

In some embodiments, the computer-readable storage medium can be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, I won't repeat them here.

The embodiment of the present application also provides a computer program product, including computer program instructions.

In some embodiments, the computer program product can be applied to the terminal device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the first terminal device in the methods of the embodiments of the present application. For the sake of brevity , which will not be repeated here.

The embodiment of the present application also provides a computer program.

In some embodiments, the computer program can be applied to the terminal device in the embodiment of the present application. When the computer program is run on the computer, the computer executes the corresponding process implemented by the terminal device in each method of the embodiment of the present application, For the sake of brevity, details are not repeated here.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

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

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. For such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A method for wireless communication, comprising:

When the first condition is met, the terminal device performs resource selection or resource reselection, where the first condition is related to at least one of the following:

Information about the number of times that the terminal device fails to execute the LBT of listening first;

The number of periods during which the terminal device does not perform semi-persistent transmission;

The remaining delay budget of the service to be transmitted of the terminal device;

the number of unused resources among the selected resources of the terminal device;

The channel congestion rate CBR measured by the terminal device;

The priority of the service to be transmitted of the terminal device.
The method according to claim 1, wherein the first condition comprises at least one of the following:

The number of times the terminal device fails to perform LBT is greater than or equal to a first threshold;

The number of periods in which the terminal device does not perform semi-persistent transmission is greater than or equal to a second threshold;

The remaining delay budget of the service to be transmitted of the terminal device is greater than or equal to a third threshold;

The number of unused resources among the selected resources of the terminal device is less than or equal to a fourth threshold;

The channel congestion rate CBR measured by the terminal device is less than or equal to the fifth threshold;

The priority of the service to be transmitted of the terminal device is higher than or equal to the sixth threshold.
The method according to claim 2, further comprising:

The terminal device determines the number of times the terminal device fails to perform LBT according to the first counter.
The method according to claim 3, further comprising:

When at least one of the following conditions is met, the first counter is reset:

The number of times the terminal device fails to perform LBT reaches the first threshold;

The terminal device performs resource selection or resource reselection.
The method according to any one of claims 2-4, wherein the method further comprises:

The terminal device determines the number of periods during which the terminal device does not perform semi-persistent transmission according to the second counter.
The method according to claim 5, wherein the method further comprises:

When at least one of the following conditions is met, the second counter is reset:

The number of periods in which the terminal device does not perform semi-persistent transmission reaches the second threshold;

The terminal device performs resource selection or resource reselection.
The method according to any one of claims 1-6, wherein the terminal device performs resource selection or resource reselection, comprising:

The terminal device determines a candidate resource set within a resource selection window;

In the set of candidate resources, resource selection or resource reselection is performed.
The method according to claim 7, wherein the performing resource selection or resource reselection in the candidate resource set includes:

For the resources for which the terminal device LBT fails to access, resource selection is performed in the candidate resource set.
The method according to claim 8, wherein the resource selection in the candidate resource set for the resources for which the terminal equipment LBT fails to access includes:

For resources for which the terminal device fails to access LBT, select X resources from the candidate resource set, where X is less than or equal to K, and K is a threshold of times the terminal device fails to perform LBT.
The method according to claim 9, wherein the X resources are randomly selected from the set of candidate resources.
The method according to claim 7, wherein the performing resource selection or resource reselection in the candidate resource set includes:

For unused resources among the selected resources of the terminal device, resource reselection is performed in the set of candidate resources.
The method according to claim 11, wherein, for the unused resources among the selected resources of the terminal device, performing resource reselection in the candidate resource set includes:

performing resource reselection in the set of candidate resources for resources not included in the set of candidate resources among the unused resources; or

For all unused resources, resource reselection is performed in the set of candidate resources.
The method according to claim 7, wherein the performing resource selection or resource reselection in the candidate resource set includes:

For the first type of unused resources among the selected resources of the terminal device, perform resource reselection in the candidate resource set, where the first type of unused resources are unused resources among the unused resources The resources indicated by the side traffic control information.
The method according to claim 13, wherein, performing resource reselection in the set of candidate resources for the first type of unused resources among the selected resources of the terminal device includes:

performing resource reselection for resources not included in the set of candidate resources in the first type of unused resources; or

For all unused resources of the first type, resource reselection is performed in the set of candidate resources.
The method according to claim 7, wherein the performing resource selection or resource reselection in the candidate resource set includes:

For the second type of unused resources among the selected resources of the terminal device, perform resource reselection in the candidate resource set, wherein the second type of unused resources are among the unused resources resources that have been indicated by sideline control information.
The method according to claim 15, wherein, performing resource reselection in the set of candidate resources for the second type of unused resources among the selected resources of the terminal device includes:

performing resource reselection for resources not included in the set of candidate resources in the second type of unused resources; or

For all unused resources of the second type, resource reselection is performed in the set of candidate resources.
A terminal device, characterized in that it includes:

A processing unit, configured to perform resource selection or resource reselection when a first condition is met, wherein the first condition is related to at least one of the following:

Information about the number of times that the terminal device fails to execute the LBT of listening first;

The number of periods during which the terminal device does not perform semi-persistent transmission;

The remaining delay budget of the service to be transmitted of the terminal device;

the number of unused resources among the selected resources of the terminal device;

The channel congestion rate CBR measured by the terminal device;

The priority of the service to be transmitted of the terminal device.
The terminal device according to claim 17, wherein the first condition includes at least one of the following:

The number of times the terminal device fails to perform LBT is greater than or equal to a first threshold;

The number of periods in which the terminal device does not perform semi-persistent transmission is greater than or equal to a second threshold;

The remaining delay budget of the service to be transmitted of the terminal device is greater than or equal to a third threshold;

The number of unused resources among the selected resources of the terminal device is less than or equal to a fourth threshold;

The channel congestion rate CBR measured by the terminal device is less than or equal to the fifth threshold;

The priority of the service to be transmitted of the terminal device is higher than or equal to the sixth threshold.
The terminal device according to claim 18, wherein the processing unit is further used for:

According to the first counter, determine the number of times that the terminal device fails to perform LBT.
The terminal device according to claim 19, wherein the processing unit is further used for:

When at least one of the following conditions is met, the first counter is reset:

The number of times the terminal device fails to perform LBT reaches the first threshold;

The terminal device performs resource selection or resource reselection.
The terminal device according to any one of claims 18-20, wherein the processing unit is further configured to:

According to the second counter, determine the number of periods in which the terminal device does not perform semi-persistent transmission.
The terminal device according to claim 21, wherein the processing unit is further used for:

When at least one of the following conditions is met, the second counter is reset:

The number of periods in which the terminal device does not perform semi-persistent transmission reaches the second threshold;

The terminal device performs resource selection or resource reselection.
The terminal device according to any one of claims 17-22, wherein the processing unit is further configured to:

determining a candidate resource set within a resource selection window;

In the set of candidate resources, resource selection or resource reselection is performed.
The terminal device according to claim 23, wherein the processing unit is further used for:

For the resources for which the terminal device LBT fails to access, resource selection is performed in the candidate resource set.
The terminal device according to claim 24, wherein the processing unit is further used for:

For resources for which the terminal device fails to access LBT, select X resources from the candidate resource set, where X is less than or equal to K, and K is a threshold of times the terminal device fails to perform LBT.
The terminal device according to claim 25, wherein the X resources are randomly selected from the candidate resource set.
The terminal device according to claim 23, wherein the processing unit is further used for:

For unused resources among the selected resources of the terminal device, resource reselection is performed in the set of candidate resources.
The terminal device according to claim 27, wherein the processing unit is further used for:

performing resource reselection in the set of candidate resources for resources not included in the set of candidate resources among the unused resources; or

For all unused resources, perform resource reselection in the set of candidate resources.
The terminal device according to claim 23, wherein the processing unit is further used for:

For the first type of unused resources among the selected resources of the terminal device, perform resource reselection in the candidate resource set, where the first type of unused resources are unused resources among the unused resources The resources indicated by the side traffic control information.
The terminal device according to claim 29, wherein the processing unit is further used for:

performing resource reselection for resources not included in the set of candidate resources in the first type of unused resources; or

For all unused resources of the first type, resource reselection is performed in the set of candidate resources.
The terminal device according to claim 23, wherein the processing unit is further used for:

For the second type of unused resources among the selected resources of the terminal device, perform resource reselection in the set of candidate resources, where the second type of unused resources are among the unused resources resources that have been indicated by sideline control information.
The terminal device according to claim 31, wherein the processing unit is further used for:

performing resource reselection for resources not included in the set of candidate resources in the second type of unused resources; or

For all unused resources of the second type, resource reselection is performed in the set of candidate resources.
A terminal device, characterized by comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any of claims 1 to 16 one of the methods described.
A chip, characterized by comprising: a processor, configured to invoke and run a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 16.
A computer-readable storage medium, characterized by being used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 29.
A computer program product, characterized by comprising computer program instructions, the computer program instructions cause a computer to execute the method according to any one of claims 1 to 29.
A computer program, characterized in that the computer program causes a computer to execute the method according to any one of claims 1-29.