WO2023178675A1

WO2023178675A1 - Communication method and communication apparatus

Info

Publication number: WO2023178675A1
Application number: PCT/CN2022/083144
Authority: WO
Inventors: 赵振山
Original assignee: Oppo广东移动通信有限公司
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2023-09-28

Abstract

Provided are a communication method and a communication apparatus. The method comprises: a terminal device adjusts, according to a target channel access result, the size of a contention window for channel access; the terminal device performs channel access in an unlicensed frequency band on the basis of the adjusted contention window. The method provided by the embodiments of the present application can improve the communication efficiency of the system.

Description

Communication method and communication device

Technical field

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

Background technique

With the development of communication technology, some communication systems support the use of unlicensed frequency bands for transmission to improve the spectrum utilization of the system. However, it is currently unclear how the sidelink (SL) transmits data in unlicensed frequency bands.

Contents of the invention

This application provides a communication method and communication device, which can improve the communication efficiency of the system.

In a first aspect, a communication method is provided, which method includes: a terminal device adjusts the size of a contention window for channel access according to a target channel access result; the terminal device performs channel access in an unlicensed frequency band based on the adjusted contention window. enter.

In a second aspect, a communication device is provided. The device includes: an adjustment unit, configured to adjust the size of the contention window for channel access according to the target channel access result; and an access unit, configured to adjust the size of the contention window based on the adjusted contention window. Authorized frequency band for channel access.

A third aspect provides a communication device, including a memory and a processor, the memory is used to store programs, and the processor is used to call the program in the memory to execute the method as described in the first aspect.

A fourth aspect provides a communication device, including a processor for calling a program from a memory to execute the method described in the first aspect.

In a fifth aspect, a chip is provided, including a processor for calling a program from a memory, so that a device installed with the chip executes the method described in the first aspect.

A sixth aspect provides a computer-readable storage medium on which a program is stored, and the program causes a computer to execute the method described in the first aspect.

A seventh aspect provides a computer program product, including a program that causes a computer to execute the method described in the first aspect.

An eighth aspect provides a computer program, which causes a computer to execute the method described in the first aspect.

In the embodiment of this application, the terminal device adjusts the size of the contention window for channel access according to the target channel access result, which can avoid the situation where side-link transmission does not support side-link feedback or the contention window cannot be adjusted when side-link feedback is deactivated. At the same time, dynamically adjusting the competition window before channel access can also improve the communication efficiency of the system.

Description of the drawings

Figure 1 is an example diagram of a wireless communication system applied to an embodiment of the present application.

Figure 2 is an example diagram of a wireless communication system applied to another embodiment of the present application.

Figure 3 is an example diagram of a wireless communication system applied to yet another embodiment of the present application.

Figure 4 is an example diagram of a wireless communication system applied to yet another embodiment of the present application.

Figure 5 is an example diagram of unicast transmission in the embodiment of the present application.

Figure 6 is an example diagram of multicast transmission in the embodiment of the present application.

Figure 7 is an example diagram of broadcast transmission in the embodiment of the present application.

Figure 8 is an example diagram of the time slot structure in V2X in the embodiment of the present application.

Figure 9 is an example diagram of a sidelink feedback channel in an embodiment of the present application.

Figure 10 is an example diagram of COT sharing in the embodiment of the present application.

Figure 11 is a schematic flow chart of a communication method provided by an embodiment of the present application.

Figure 12 is an example diagram of channel access results within the first time interval in an embodiment of the present application.

Figure 13 is an example diagram of the latest N channel access results in an embodiment of the present application.

Figure 14 is an example diagram of the latest N channel access results in another embodiment of the present application.

Figure 15 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

Figure 16 is a schematic structural diagram of a device provided by an embodiment of the present application.

Detailed ways

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

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: fifth generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency Frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication systems, and so on.

The user equipment (user equipment, UE) in the embodiment of this application may also be called terminal equipment, access terminal, user unit, user station, mobile station, mobile station (mobile station, MS), mobile terminal (mobile Terminal, MT). ), remote station, remote terminal, mobile device, user terminal, terminal, wireless communications equipment, user agent or user device. The UE in the embodiment of this application may refer to a device that provides voice and/or data connectivity to users, and may be used to connect people, things, and machines, such as handheld devices, vehicle-mounted devices, etc. with wireless connection functions. The UE in the embodiment of this application may be a mobile phone (mobile phone), tablet computer (Pad), notebook computer, handheld computer, mobile Internet device (mobile internet device, MID), wearable device, virtual reality (VR) ) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, smart grids Wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, etc. Optionally, the UE may be used to act as a base station. For example, a UE may act as a scheduling entity that provides sidelink signals between UEs in vehicle to everything (V2X) or device to device (D2D), etc. For example, cell phones and cars use sidelink signals to communicate with each other. Cell phones and smart home devices communicate between each other without having to relay communication signals through base stations.

The network device in the embodiment of the present application may be a device used to communicate with the UE. The network device may also be called an access network device or a wireless access network device. For example, the network device may be a base station. The network device in the embodiment of this application may refer to a radio access network (radio access network, RAN) node (or device) that connects the UE to the wireless network. The base station can broadly cover various names as follows, or be replaced with the following names, such as: Node B (NodeB), evolved base station (evolved NodeB, eNB), next generation base station (next generation NodeB, gNB), relay station, Access point, transmission point (transmitting and receiving point, TRP), transmitting point (TP), main station MeNB, secondary station SeNB, multi-standard wireless (MSR) node, home base station, network controller, access node , wireless node, access point (AP), transmission node, transceiver node, base band unit (BBU), radio remote unit (Remote Radio Unit, RRU), active antenna unit (active antenna unit) , AAU), radio head (remote radio head, RRH), central unit (central unit, CU), distributed unit (distributed unit, DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof.

It should be understood that all or part of the functions of the network device and UE in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform).

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 that describes related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations. In addition, the character "/" in this article generally indicates that the related 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 description, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific sequence. . Furthermore, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

It should be understood that the "instruction" mentioned in the embodiments of this application may be a direct instruction, an indirect instruction, or 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 mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B. relation.

In the description of the embodiments of this application, the term "correspondence" can mean that there is a direct correspondence or indirect correspondence between the two, it can also mean that there is an associated relationship between the two, or it can mean indicating and being instructed, configuration and being. Configuration and other relationships.

In this application, "predefinition" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in equipment (for example, including terminal equipment and network equipment). This application does not have any specific implementation methods. Make limitations. For example, predefined can refer to what is defined in the protocol.

In this application, the "protocol" may refer to a standard protocol in the communication field, which may include, for example, LTE protocol, NR protocol, and related protocols applied in future communication systems. This application does not limit this.

The technical solutions in the embodiments of this application can be applied to side-line communication. The side-line communication will be introduced in detail below.

In side-link communication, according to the different network coverage conditions of the communicating terminal equipment, it can be divided into side-link communication with network coverage, side-link communication with partial network coverage, and side-link communication with network coverage. The details can be shown in Figure 1. Figure 2, Figure 3 and Figure 4.

In side-link communication within network coverage, all terminal devices performing side-link communication are within the coverage of the same base station. As shown in Figure 1,

terminal devices

120 and 130 are both within the network coverage of network device 110, and can receive the sidelink configuration sent by network device 110, and perform sidelink communication based on the sidelink configuration.

In the case where part of the network covers side-link communication, some terminal devices performing side-link communication are located within the coverage of the network equipment. As shown in Figure 2, the terminal device 220 can receive the side-link configuration of the network device 210 and perform side-link communication based on the side-link configuration. However, the terminal device 230 located outside the network coverage cannot receive the side-link configuration of the network device 210. , in this case, the terminal device 230 outside the network coverage can determine the side link based on the pre-configuration information and the information carried in the physical sidelink broadcast channel (PSBCH) sent by the terminal device 220 row configuration, and perform side-link communication based on the side-link configuration.

For side-line communications outside network coverage, all terminal devices performing side-line communications are located outside the network coverage. As shown in Figure 3, both

terminal devices

310 and 320 are located outside the network coverage. At this time, the

terminal devices

310 and 320 can respectively determine the side-link configuration according to the pre-configuration information, and perform side-link communication based on the side-link configuration.

In sideline communication, multiple terminal devices can also form a communication group. The communication group has a central control node, which can also become the group head terminal (cluster header, CH). The central control node has one of the following functions: Responsible for Establishment of a communication group; control the joining and leaving of group members; coordinates resources, allocates side transmission resources to other terminal devices in the communication group, receives side transmission information from other terminal devices; coordinates resources with other communication groups, etc. . As shown in Figure 4,

terminal devices

410, 420 and 430 form a communication group. Terminal device 410 is the central control node of the communication group.

Terminal devices

420 and 430 are group members. Terminal device 410 can allocate sides to

terminal devices

420 and 430. Line transmission resources.

Device-to-device communication is a sidelink (SL) transmission technology based on D2D. Different from the way communication data is received or sent through network devices in traditional cellular systems, device-to-device communication has higher spectrum efficiency. and lower transmission latency. For example, the Internet of Vehicles system can communicate using end-to-end communication. Currently, two transmission modes are defined for device-to-device communication in the 3rd generation partnership project (3GPP): first mode and second mode.

First mode: The transmission resources of the terminal device are allocated by the network device, and the terminal device sends data on the sidelink according to the resources allocated by the network device; the network device can allocate resources for a single transmission to the terminal device, or it can Allocate resources for semi-static transmission to terminal devices. For example, as shown in Figure 1, the terminal device is located within the coverage of the network, and the network device allocates transmission resources for sidelink transmission to the terminal device.

Second mode: The terminal device selects a resource in the resource pool for data transmission. For example, as shown in Figure 3, the terminal device is located outside the network coverage. At this time, the terminal device can independently select transmission resources from the preconfigured resource pool for side transmission; or, as shown in Figure 1, the terminal device can also be Transmission resources are independently selected from the resource pool configured in the network for side transmission.

New radio vehicle to everything (NR-V2X) is a side link transmission technology used in vehicle wireless communications. In NR-V2X, unicast, multicast and broadcast transmission methods are supported. For unicast transmission, there is only one receiving terminal. As shown in Figure 5, unicast transmission is performed between terminal equipment 510 and terminal equipment 520; for multicast transmission, the receiving end is all terminal equipment in a communication group. , or all terminal devices within a certain transmission distance. As shown in Figure 6,

terminal devices

610, 620, 630 and 640 form a communication group. Among them, terminal device 610 sends data, and other terminal devices in the communication group all is the receiving terminal device; for the broadcast transmission method, the receiving end is any terminal around the sending terminal device. As shown in Figure 7, the terminal device 710 is the sending terminal device, and the terminal devices 720-760 are all terminal devices 710 Among the surrounding receiving terminal devices, the terminal device 710 can send data to the terminal devices 720-760.

The time slot structure in NR-V2X can be shown in Figure 8. Among them, part (a) in Figure 8 shows the time slot structure that does not include the physical sidelink feedback channel (PSFCH) in the time slot; part (b) in Figure 8 shows the time slot structure that includes the PSFCH.

As shown in Figure 8, the physical sidelink control channel (PSCCH) in NR-V2X starts from the second sidelink symbol of the time slot in the time domain and occupies 2 or 3 orthogonal frequency divisions. Multiplexing (orthogonal frequency division multiplexing, OFDM) symbols can occupy {10,12 15,20,25} physical resource blocks (PRB) in the frequency domain. In order to reduce the complexity of the UE's blind detection of PSCCH, only one number of PSCCH symbols and one number of PRBs can be configured in a resource pool. In addition, because the sub-channel is the minimum granularity of physical sidelink shared channel (PSSCH) resource allocation in NR-V2X, the number of PRBs occupied by PSCCH can be less than or equal to the number of PRBs contained in a sub-channel in the resource pool. , so as not to cause additional restrictions on PSSCH resource selection or allocation. PSSCH also starts from the second sidelink symbol of the time slot in the time domain. The last time domain symbol in the time slot is the guard period (GP) symbol, and the remaining symbols are mapped to the PSSCH. The first siderow symbol in this time slot is a repetition of the second siderow symbol. Usually the receiving terminal equipment uses the first siderow symbol as an automatic gain control (automatic gain control, AGC) symbol. On this symbol The data are usually not used for data demodulation. PSSCH can occupy K sub-channels in the frequency domain, and each sub-channel can include M consecutive PRBs, where K and M are integers.

As shown in part (b) of Figure 8, when the time slot contains the PSFCH channel, the second to last and third to last symbols in the time slot are used for PSFCH channel transmission, and a time domain symbol before the PSFCH channel is used as GP symbol.

In order to improve reliability, a sidelink feedback channel is introduced in NR-V2X. For example, as shown in Figure 9, for unicast transmission, the terminal device 910 may send sideline data (for example, may include PSCCH and PSSCH) to the terminal device 920. Correspondingly, the terminal device 920 may send hybrid automatic repeat to the terminal device 910. Send request (hybrid automatic repeat request, HARQ) sideline feedback information (for example, may include ACK or NACK), and the terminal device 910 can determine whether retransmission is required based on the sideline feedback information sent by the terminal device 920. The HARQ sidelink feedback information can be carried in a sidelink feedback channel, such as PSFCH.

Of course, sideline feedback can also be activated or deactivated through preconfiguration information or network configuration information, or sideline feedback can be activated or deactivated through the sending end terminal device. If sidelink feedback is activated, the receiving end terminal device can receive the sideline data sent by the sending end terminal device, and feedback ACK or NACK to the sending end terminal device according to the detection result. The sending end terminal device decides to resend based on the feedback information from the receiving end. Transmit data or new data; if side row feedback is deactivated, the receiving terminal device does not need to send feedback information, and the sending terminal device can send data using blind retransmission. For example, the sending terminal repeats each side row data Send S times (S is an integer), instead of deciding whether to send retransmission data based on feedback information from the receiving terminal. In sideline communication, unicast and multicast transmission methods support sideline feedback, while broadcast transmission methods do not support sideline feedback.

The technical solutions in the embodiments of this application can be applied to unlicensed spectrum.

The unlicensed frequency band (also known as shared spectrum or unlicensed spectrum) is a frequency band allocated by countries and regions that can be used for radio equipment communication. This frequency band is usually considered a shared frequency band, that is, communication equipment in different communication systems only needs to meet the national or regional requirements. This frequency band can be used according to the regulatory requirements set by the region on this frequency band, and there is no need to apply for a dedicated frequency band authorization from the government. For example, wireless fidelity (Wi-Fi) systems are deployed in unlicensed frequency bands, and LTE systems and NR systems respectively operate in unlicensed frequency bands through long term evolution (long term evolution in unlicensed spectrum, LTE-U) technology. And new radio in unlicensed spectrum (NR-U) technology that works in unlicensed frequency bands can also work in unlicensed frequency bands.

In unlicensed frequency bands, multiple communication technologies may exist simultaneously. For example, Wi-Fi, NR-U, sidelink in unlicensed spectrum (SL-U), etc., multiple communication technologies can coexist in unlicensed frequency bands. Therefore, terminal equipment is using Before communicating in the unlicensed frequency band, channel access is required to determine whether the channel is idle. The channel access process can also be called the "listen before talk, LBT" process. If it is idle, the terminal device can access the channel and perform data transmission, otherwise it cannot access the channel until the channel is idle. The following describes the channel access process on the unlicensed frequency band in conjunction with NR-U.

Signal transmission on unlicensed spectrum (or shared spectrum) includes the following basic concepts:

1. Maximum channel occupancy time (MCOT): refers to the maximum length of time allowed to use unlicensed frequency band channels for signal transmission after LBT is successful. There are different MCOTs under different channel access priorities. For example, the current maximum value of MCOT can be 10ms. It should be understood that the MCOT is the time occupied by signal transmission.

It should be noted that the channel access result may be information on whether to access the channel, for example, information on whether to access the channel is determined based on the channel monitoring result. Channel access in the unlicensed frequency band can usually be achieved through LBT. Therefore, in one embodiment of this application, channel access can be considered to have similar meanings to LBT. Correspondingly, the channel access result can also be an LBT result.

2. Channel occupancy time (COT): refers to the length of time that the unlicensed spectrum channel is used for signal transmission after LBT is successful. During this length of time, the signal occupancy of the channel may be discontinuous. For example, a COT cannot exceed 20ms at most, and the signal transmission within the COT does not take longer than MCOT.

3. Channel occupancy time of network equipment (i.e. base station) (gNB-initiated COT): also called COT initiated by network equipment, it refers to the channel occupancy time obtained after successful LBT of network equipment. In addition to being used for downlink transmission, the channel occupation time of the network device can also be used for the UE to perform uplink transmission under certain conditions.

4. UE's channel occupancy time (UE-initiated COT): also called UE-initiated COT, refers to the channel occupancy time obtained after the UE LBT is successful.

5. Downlink transmission opportunity (DL burst): A group of downlink transmissions (that is, including one or more downlink transmissions) performed by network equipment. The group of downlink transmissions is continuous transmission (that is, there is no gap between multiple downlink transmissions), or the group of downlink transmissions is continuous. There is a gap in the group's downstream transmission but the gap is less than or equal to 16μs. If the gap between two downlink transmissions performed by the network device is greater than 16 μs, then the two downlink transmissions are considered to belong to two downlink transmission opportunities.

6. Uplink transmission opportunity (UL burst): a group of uplink transmissions (that is, including one or more uplink transmissions) performed by a UE. The group of uplink transmissions are continuous transmissions (that is, there are no gaps between multiple uplink transmissions), or the group of uplink transmissions is continuous. There is a gap in the group's uplink transmission but the gap is less than or equal to 16μs. If the gap between two uplink transmissions performed by the UE is greater than 16 μs, then the two uplink transmissions are considered to belong to two uplink transmission opportunities.

In NR-U, channel access can be performed through the following channel access types (or, it can also be called LBT type). The details are as follows:

1. Type 1 channel access

Type 1 channel access is multi-slot channel detection based on random backoff with contention window size adjustment. According to the channel access priority p, channel occupation with a length of T _mcot can be initiated. For example, the network device can use the type 1 LBT type. In addition to sending its own data, it can also share the COT with the terminal device; the terminal device can use the type 1 LBT type. In addition to sending its own data, it can also share the COT with the network device. Table 1 below shows the channel access priority and its corresponding parameters when the terminal device performs type 1LBT.

Table 1 Channel access parameters corresponding to different channel priorities

Among them, in the above Table 1, m _p represents the number of backoff time slots corresponding to the channel access priority, CW _p represents the size of the contention window corresponding to the channel access priority, and CW _{min, p} represents the channel access priority. The minimum value of the CW _p value corresponding to the level, CW _max,p represents the maximum value of the CW _p value corresponding to the channel access priority, and T _mcot,p represents the maximum occupation time length of the channel corresponding to the channel access priority.

2. Type 2 channel access

Type 2 channel access is based on channel detection of fixed-length channel listening time slots. Type 2 channel access can include the following:

Type 2A channel access: The channel detection method of the terminal equipment is 25μs single time slot channel detection. Specifically, under type 2A channel access, the terminal device can monitor the channel for 25 μs before the transmission starts, and transmit data after the channel monitoring is successful.

Type 2B channel access: The channel detection method of the terminal equipment is 16μs single time slot channel detection. Specifically, under type 2B channel access, the terminal device can monitor the channel for 16 μs before the transmission starts, and transmit after the channel monitoring is successful. Among them, the gap size between the starting position of this transmission and the end position of the previous transmission is 16 μs.

Type 2C channel access: The terminal device transmits without performing channel detection after the gap ends. Specifically, under type2C channel access, the terminal device can directly transmit, where the gap size between the starting position of the transmission and the end position of the previous transmission is less than or equal to 16 μs. Among them, the length of the transmission does not exceed 584μs.

The channel access schemes applied in different COT sharing scenarios are different. Figure 10 shows an example of COT sharing on the network device side. As shown in the upper part of Figure 10, for an uplink transmission opportunity that occurs within the COT of a network device, if the gap between the starting position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is less than or equal to 16 μs, the terminal device Type2C channel access can be performed before the uplink transmission; as shown in the middle part of Figure 10, if the gap between the starting position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is equal to 16 μs, the terminal device can Type 2B channel access is performed before the uplink transmission; as shown in the lower part of Figure 10, if the gap between the starting position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is equal to 25μs or greater than 25μs, the terminal equipment Type 2A channel access can be performed before the uplink transmission. In addition, the COT obtained by the network device may include multiple uplink and downlink conversion points. When the network device shares the COT it obtains with the terminal device for uplink transmission, within the COT, the network device can also use type 2 channel access method such as type 2A channel access method to conduct channel monitoring, and after the channel monitoring is successful, Restart downstream transmission.

In NR-U, before the terminal device starts accessing the type1 channel, the size of the contention window CW _p needs to be adjusted. Generally, if the number of devices using unlicensed frequency bands is small and the probability of conflict between devices is low, a lower value can be selected for the contention window to increase the speed of device access to the channel and the probability of success; if using unlicensed frequency bands If the number of devices in the frequency band is large, a higher value can be selected for the competition window. In this way, by dynamically adjusting the size of the contention window, the efficiency of data transmission can be improved, thereby improving the communication efficiency of the system. For example, in the initial situation, the size of the contention window CW _p can be set to the minimum value CW _min,p in Table 1; during the transmission process, the size of the contention window CW _p can be set according to the received acknowledgment (ACK) or negative acknowledgment (NACK) information, adjusted within the allowed value range of CW _p ; if the contention window CW _p has increased to the maximum value CW _max,p , when the maximum contention window CW _max,p is maintained for a certain number of times , the size of the competition window CW _p can be reset to the minimum value CW _min,p .

The terminal device can adjust CW _p according to the reception condition of the sent physical uplink shared channel (PUSCH). For example, when the terminal device receives ACK or NACK, if the number or proportion of ACKs corresponding to PUSCH received by the terminal device reaches the preset threshold, CW _p can be set to CW _min,p ; otherwise, CW _p can be increased to the lower An available value; when the terminal device does not receive an ACK or NACK, an implicit indication (such as downlink control information (DCI) scheduling retransmission or new data transmission) can be considered equivalent to an ACK. If the terminal device receives If the implicit indication is reached, CW _p can be kept unchanged; otherwise, CW _p can be increased to the next available value.

In SL-U, the terminal device needs to adjust the size of the contention window based on HARQ feedback information before accessing the channel. When performing channel access on an unlicensed frequency band, the terminal device also needs to adjust the size of the contention window. However, the broadcast transmission mode in side-link communication does not support side-link feedback. When the terminal device works in broadcast transmission mode, or the terminal device deactivates side-link feedback (such as working in unicast or multicast transmission mode but deactivating side-link feedback) ), the terminal device cannot obtain the HARQ feedback information, and thus cannot adjust the size of the contention window based on the HARQ feedback information.

In order to solve one or more of the above technical problems, this application proposes a communication method and a communication device. The embodiments of the present application will be described in detail below with reference to FIGS. 11 to 14 .

The target channel access result in the embodiment of this application will be described in detail below.

In this embodiment of the present application, the target channel access result may include the channel access result within the first time interval. The channel access result within the first time interval here may refer to the channel access result performed by the terminal device within the first time interval.

The first time interval may be determined according to one of the following: a time when the terminal device needs to perform sidelink transmission, a time when the terminal device starts channel access, and a time when the terminal device determines the size of the contention window. Optionally, the first time interval may be a time interval between (n-T1) and (n-T2). For example, the first time interval may refer to [n-T1,n-T2], (n-T1,n-T2] or [n-T1,n-T2).

In some possible implementations, n can be one of the following: the time when the terminal device needs to perform sidelink transmission, the time when the terminal device starts channel access, and the time when the terminal device determines the size of the contention window, T1 and T2 can be predefined by the protocol, determined based on preconfiguration information, determined based on network configuration information, or determined based on the processing time of the terminal device for channel access. n, T1 and T2 are integers, and T1 and T2 can be expressed as Seconds, milliseconds (ms) or microseconds (us), etc., or expressed as the number of time slots. It should be noted that when the terminal device performs channel access, the channel needs to be measured or monitored. The processing time for the terminal device to perform channel access here may include the terminal device obtaining the channel measurement result or the channel monitoring result and determining whether the channel is connected. time for success.

Optionally, the network device information (such as resource pool configuration information) may include configuration parameters indicating T1. For example, the configuration parameters in the resource pool configuration information may indicate T1=100ms; T2 may be determined according to the protocol predefined information. The value of

If the side subcarrier spacing corresponds to μ _SL =2, the T2 = 2 time slot can be determined according to the side subcarrier spacing parameter. Optionally, T1 may also be determined based on the sidelink subcarrier spacing parameter.

Table 2 Correspondence between T2 and sidelink subcarrier spacing parameters

侧行子载波间隔参数(μ _SL) Side row subcarrier spacing parameter (μ _SL )	T2(时隙)T2 (time slot)
00	11
11	11
22	22
33	44

Parameters for determining the number of times the terminal device needs to perform channel access within the first time interval may be included in the preconfiguration information or the network configuration information.

Optionally, the preconfiguration information or network configuration information may include the minimum number of slots included in the first time interval, or the minimum number of times the terminal device performs channel access in the first time interval, or the minimum number of times the terminal device performs channel access in the first time interval. The minimum number of slots to perform channel access within the interval.

Optionally, the preconfiguration information or network configuration information may also include a first value. The first value may represent the number of time slots in which the terminal device performs channel access within the first time interval and the number of time slots included in the first time interval. The threshold value of the ratio of numbers. For example, the threshold value may correspond to the minimum value or the lower limit of the ratio. In this case, based on the number of time slots included in the first time interval and the ratio, it can be determined that the terminal equipment needs to perform channel access within the first time interval. The number of times of entry or the number of time slots to perform channel access.

For example, assuming that the first time interval includes N _{total time} slots, and the number of times the terminal device needs to perform channel access in the first time interval is N _CA , then the terminal device can perform channel access in each time interval.

Channel access is performed once in each time slot. For example, channel access can be performed for a time slot whose time slot index meets the following conditions: mod(Index _slot ,X)=k, where k=0 or k=X-1, and Index _slot represents the time slot index. Optionally, the time slot index can represent the index of the time slot in the resource pool, 0≤Index _slot <T _max , T _max represents the resource pool in a system frame number (SFN) cycle (such as the SFN cycle Can correspond to the total number of time slots included in 10240ms).

In some possible implementations, T1 and T2 are determined based on first information, and the first information may include at least one of the following: channel access priority class (CAPC), sidelink priority, and channel Busy rate (channel busy ratio, CBR), T1 and T2 are integers.

Among them, as shown in Table 1, the lower the value of the channel access priority, the higher the priority; the sidelink priority can refer to the priority carried in the sidelink control information (SCI) Information, the lower the sidelink priority value, the higher the priority level; the channel busy rate can refer to the channel busy rate of the resource pool where the terminal device performs sidelink transmission, or the channel busy rate can be based on the unlicensed frequency band including Determined by the highest or lowest value of CBR in all resource pools.

Optionally, the preconfiguration information or network configuration information may include a corresponding relationship between T1 and the first information, and/or a corresponding relationship between T2 and the first information. Correspondingly, the terminal device can determine the values of T1 and/or T2 according to the corresponding relationship.

The channel access results within the first time interval mentioned in the foregoing embodiments may refer to all channel access results within the first time interval (such as channel access results corresponding to all time slots within the first time interval), or It may refer to partial channel access results within the first time interval (such as channel access results corresponding to all time slots within the first time interval). As mentioned before, the channel access result may refer to the LBT result.

Optionally, the channel access results within the first time interval may include at least one of the following: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.

For example, the channel access results in the first time interval may include: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results, but not type 2C type channel access results. ; For another example, the channel access results in the first time interval may only include type 1 channel access results, but not type 2A type channel access results, type 2B type channel access results, and type 2C type channel access results. Results; for another example, the channel access results in the first time interval may only include type 1 type channel access results and type 2A type channel access results, but not type 2B type channel access results and type 2C type channel access results. Enter the results; for another example, the channel access results in the first time interval may only include type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results, but not type 2C type channels. Access results.

Alternatively, the target channel access result may include the latest N channel access results, where N is a positive integer.

In some possible implementations, N may be predefined by the protocol, determined based on preconfiguration information, or determined based on network configuration information. For example, the resource pool configuration information may include parameters for determining N.

Alternatively, N may also be determined based on the first information. As mentioned above, the first information may include at least one of the following: channel access priority, sidelink priority, and channel busy rate.

For example, the higher the channel access priority, the lower the value of N; the lower the channel access priority, the higher the value of N. For another example, the higher the side row priority, the lower the value of N can be; the lower the side row priority, the higher the value of N can be. For another example, the lower the CBR, the lower the value of N can be; the higher the CBR, the higher the value of N can be.

Optionally, when N=1, that is, the terminal device determines the value of CW _p based on the result of the last channel access. For example, if the last channel access is successful, the value of CW _p can be reduced to the next available CW _p value, or the value of CW _p can be set to CW _min,p ; if the last channel access is If it fails, the value of CW _p can be increased to the next available value of CW _p , or the value of CW _p can be set to CW _max,p .

The latest N channel access results may refer to the latest N channel access results of any type (that is, the channel access type is not limited), or may refer to the latest N channel access results of a specific type.

Optionally, the latest N channel access results may include at least one of the following: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.

For example, the latest N channel access results may include: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results, but not type 2C type channel access results; for another example , the latest N channel access results may only include type 1 type channel access results, but not type 2A type channel access results, type 2B type channel access results, and type 2C type channel access results; for another example, The recent N channel access results may only include type 1 type channel access results and type 2A type channel access results, but not type 2B type channel access results and type 2C type channel access results; for another example, the recent N The secondary channel access results may only include type 1 type channel access results, type 2A type channel access results and type 2B type channel access results, but not type 2C type channel access results.

For example, as shown in Figure 13, the terminal device can perform type 2A channel access for odd-numbered time slots, such as time slots 1, 3, 5, 7, and 9 in Figure 13, and type 1 type channel for even-numbered time slots. Access, such as time slots 0, 2, 4, 6 and 8 in Figure 13. The terminal device can determine N=3 based on the network configuration information. Type 1 channel access is required in time slot 8. Therefore, the terminal device needs to determine the value of CW _p . At this time, the terminal device can determine the value of CW p based on the latest three type 1 The value of CW _p is determined by the type channel access result, that is, the value of CW _p can be determined based on the type 1 type channel access result of time slots 2, 4, and 6.

For another example, as shown in Figure 13, the terminal device can perform type 2A channel access for odd-numbered time slots, such as time slots 1, 3, 5, 7, and 9 in Figure 13, and type 1 type for even-numbered time slots. Channel access, such as time slots 0, 2, 4, 6 and 8 in Figure 13. The terminal device can determine N=3 based on the network configuration information. Type 1 channel access is required in time slot 8. Therefore, the terminal device needs to determine the value of CW _p . At this time, the terminal device can determine the value of CW p based on the latest three type 1 channel accesses. The access result determines the value of CW _p , that is, the value of CW _p is determined based on the channel access results of time slots 2, 4, and 6.

The above embodiment introduces the target channel access result in the embodiment of the present application in detail. The method in the embodiment of the present application will be described in detail below with reference to Figure 11.

Figure 11 is a schematic flow chart of the communication method according to the embodiment of the present application. The method 1100 shown in Figure 11 may include steps S1110 and S1120, specifically as follows:

S1110: The terminal device adjusts the size of the contention window for channel access according to the target channel access result.

In some possible implementations, the terminal device may adjust the size of the contention window according to the number of successful channel accesses within the first time interval.

Optionally, if the ratio between the number of times the terminal device successfully accesses the channel in the first time interval and the total number of times the terminal device performs channel access in the first time interval is greater than the second value, the contention window can be reduced. ; If the ratio between the number of times the terminal device successfully accesses the channel in the first time interval and the total number of times the terminal device performs channel access in the first time interval is less than the second value, the contention window can be increased. Optionally, the second value may be a threshold value.

For example, if the ratio between the number of times the terminal device successfully accesses the channel in the first time interval and the total number of times the terminal device performs channel access in the first time interval is greater than the second value, the value of CW _p can be reduced. to the value of the next available CW _p corresponding to the channel access priority, or set the value of CW _p to CW _min,p ; if the number of successful channel accesses of the terminal device in the first time interval is equal to If the ratio between the total number of times the terminal device performs channel access within the first time interval is less than the second value, the value of CW _p can be increased to the value of the next available CW _p corresponding to the channel access priority. value, or set the value of CW _p to CW _max,p .

For example, as shown in Figure 12. The terminal equipment needs to perform sidelink transmission in time slot 8, so it needs to perform type 1 channel access for time slot n. The channel access priority is 3. The current value of CW _p is 63. The terminal determines T1=8, T2=1, at this time, the first time interval is [n-8,n-1], that is, time slot 0 to time slot 7 shown in Figure 12, including a total of 8 time slots, configured in the resource pool configuration information The first value of is the ratio of the number of time slots for performing channel access to the number of time slots included in the first time interval. Assume that the value of the first value is 0.5, and the terminal device performs the execution for odd time slots in the first time interval. LBT, among which, the LBT on time slots 1, 5 and 7 is successful, and the LBT on time slot 3 fails. The second value of the resource pool configuration is 0.6. Since the number of time slots for successful LBT execution is different from the total number of channel access executions, If the ratio of the number of time slots (i.e. 0.75) is greater than the second value, the value of CW _p can be reduced to the next available CW _p value, which is 31; or, the value of CW _p can also be directly set to CW _min,p (ie the minimum value), which is 15.

For another example, in the above embodiment, if the terminal device performs LBT for time slots 1, 3, 5, and 7, the result is that LBT fails on time slots 1 and 7, and LBT succeeds on time slots 3 and 5. Due to the execution of LBT If the ratio of the number of successful time slots to the total number of time slots performed for channel access (ie, 0.5) is less than the second value, the value of CW _p can be increased to the next available value of CW _p , which is 127; or, You can also directly set the value of CW _p to CW _max,p (ie, the maximum value), which is 1023.

The second value may be determined based on preconfiguration information or network configuration information. For example, the resource pool configuration information or the sidelink bandwidth part (BWP) configuration information may include parameters for determining the second value.

Alternatively, the second numerical value may also be determined based on the first information. As mentioned above, the first information may include at least one of the following: channel access priority, sidelink priority, and channel busy rate. Optionally, the preconfiguration information or network configuration information may include a correspondence between the second value and the first information. Correspondingly, the terminal device can determine the second value according to the corresponding relationship.

For example, the second value can be determined according to the channel access priority, and the resource pool configuration information can include the corresponding relationship between the channel access priority and the second value, that is, the second value can be configured separately for different channel access priorities; When the terminal device performs type 1 type channel access at time n (n is an integer), the second value may be determined based on the channel access priority. Further, the second value may be determined based on the number of successful channel access attempts within the first time interval. Adjust the value of CW _p according to the ratio between the total number of times entered and the second value.

For another example, the second value may be determined based on the sidelink priority. The resource pool configuration information may include the corresponding relationship between the sidelink priority and the second value. When the terminal device performs type 1 type channel access at time n, it may be determined based on the sidelink priority. The priority determines the second value. Further, the value of CW _p can be adjusted according to the ratio between the number of successful channel accesses in the first time interval and the total number of times of performing channel access and the second value.

For another example, the second value can be determined based on the sidelink priority and CBR. The resource pool configuration information can include the corresponding relationship between the sidelink priority, CBR and the second value. When the terminal device performs type 1 type channel access at time n, The second value may be determined based on the sidelink priority corresponding to the sidelink data to be transmitted and the measured CBR. Further, the second value may be determined based on the number of successful channel accesses within the first time interval and the total number of times the channel access is performed. The relationship between the ratio and the second value, adjust the value of CW _p .

Optionally, the terminal device may adjust the size of the contention window according to the number of successful channel accesses within the first time interval and the second information. The third value has a corresponding relationship with multiple candidate values of the contention window (as shown in Table 1, the allowed CW _p values corresponding to each channel access priority), and the second information may include the third value and multiple candidate values. Correspondence between candidate values. For example, there may be a one-to-one correspondence between the third value and multiple candidate values of the competition window, that is, the third value includes multiple values, and there is a one-to-one correspondence between the multiple values and the multiple candidate values. Further, the second information may include a third value, a plurality of candidate values, and a correspondence between the first information.

The terminal device may compare the third value with the third value according to the ratio between the number of successful channel accesses and the total number of times channel access is performed within the first time interval, and then determine the value of CW _p in combination with the second information. Optionally, the second information may be determined based on preconfiguration information or network configuration information.

For example, taking type 1 channel access with channel access priority 3 as an example, the corresponding relationship between the value of CW _p and the third value (i.e., the second information) can be as shown in Table 3 and Table 4 below. :

Table 3: When CAPC=3, the correspondence between the value of CW _p and the third value

第三数值RThe third value R	0.80.8	0.60.6	0.50.5	0.40.4	0.20.2	0.10.1	00
CW _p取值 CW _p value	1515	3131	6363	127127	255255	511511	10231023

Table 4: When CAPC=3, the correspondence between the value of CW _p and the third value

For the above Table 3, the terminal device can compare the ratio K between the number of successful channel access times and the total number of times channel access is performed in the first time interval and the third value R, and select the condition K>R (or The minimum value of all CW _p values for K≥R), K and R are real numbers. For example, if K=0.7, all third values R that satisfy K>R include 0.6, 0.5, 0.4, 0.2, 0.1 and 0; the minimum value of CW _p corresponding to these values is 31; therefore, you can Determine the value of CW _p to be 31. For example, if K=0.3, all third values R that satisfy K>R include 0.2, 0.1 and 0; the minimum value of CW _p corresponding to these values is 255; therefore, the value of CW _p can be determined The value is 255

For the above Table 4, the terminal device can compare the ratio K between the number of successful channel access times and the total number of channel access executions in the first time interval with the third value R, and select a value that satisfies the value range of R. Corresponds to the value of CW _p . For example, if K=0.7, it is within 0.8≥R>0.6. Therefore, it can be determined that the value of CW _p is 31. For example, if K=0.3, it is located at 0.4≥R>0.2. Therefore, it can be determined that the value of CW _p is 255.

Optionally, the second information may include a third value, a plurality of candidate values, and a correspondence between the first information.

In some possible implementations, the terminal device can adjust the size of the contention window according to the number of successful channel accesses in the latest N channel access results.

Optionally, if the ratio between the number of channel access successes of the terminal device and N in the last N channel access results is greater than or equal to the fourth value, the contention window can be reduced; If the ratio between the number of successful channel access times and N in the access result is less than the fourth value, the contention window can be increased.

Optionally, the fourth numerical value may represent a threshold value of the ratio, and the ratio may represent a proportion of successful channel access.

The fourth value may be predefined by the protocol, determined based on preconfiguration information, or determined based on network configuration information.

Optionally, the terminal device may determine N and the fourth value V4 according to the preconfiguration information or network configuration information, and determine the number of channel access successes A. For example, A=N·V4 (or

or

). Further, the terminal device can determine the number B of successful channel accesses in the N channel access processes based on the access results of the N times of channel access, and determine the value of CW _p based on the relationship between A and B.

For example, if B is greater than or equal to A, the value of CW _p can be reduced to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to CW _min,p ; If B is less than A, the value of CW _p can be increased to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to CW _max,p .

Optionally, the terminal device may determine N and the fourth value according to the preconfiguration information or network configuration information, and the terminal device may determine, according to the access results of the N times of channel access, whether the channel access is successful during the N times of channel access. Degree B, determine the value of CW _p based on N, B and the fourth numerical value.

For example, if B/N is greater than or equal to the fourth value, the value of CW _p can be reduced to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to CW _min,p ; if B/N is less than the fourth value, the value of CW _p can be increased to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to is CW _max,p .

The fourth value may be determined based on the first information.

For example, the higher the channel access priority, the lower the fourth numerical value; the lower the channel access priority, the higher the fourth numerical value. For another example, the higher the priority of the side row, the lower the value of the fourth numerical value; the lower the priority of the side row, the higher the value of the fourth numerical value. For another example, the lower the CBR, the lower the fourth numerical value can be; the higher the CBR, the higher the fourth numerical value can be.

For example, as shown in Figure 14, the terminal equipment needs to perform sidelink transmission in time slot 8 and needs to perform type 1 channel access. Assume that the channel access priority is 3, the current CW _p value is 63, and the terminal equipment The fourth value is determined to be 0.5, and the value of parameter N is determined to be 6. Therefore, the terminal device can determine the value of CW _p based on the channel access results of the six time slots before time slot 8. These six time slots are shown in Figure 14 Slots 2 to 7 are shown in . As shown in Figure 14, the terminal device fails to access the channel in time slot 2 and time slot 3, but succeeds in channel access in time slot 4 to time slot 7. Therefore, the channel access success rate is 0.67. Since the proportion of successful execution of LBT (ie, 0.67) is greater than the fourth value, the terminal device can reduce the value of CW _p to the next available value of CW _p , that is, 31, or the value of CW _p can be set to CW _min,p , which is 15. For another example, in Figure 14, if the terminal device fails to perform LBT on time slots 2 to 5, and the LBT succeeds on time slots 6 and 7, the proportion of successful LBT execution (i.e., 0.33) is smaller than the fourth value, the terminal device can increase the value of CW _p to the next available value of CW _p , that is, 127, or it can set the value of CW _p to CW _max,p , that is, 1023.

Optionally, if the number of channel access successes of the terminal device in the latest N channel access results is greater than or equal to the fifth value, the contention window is reduced;

If the number of channel access successes of the terminal device in the latest N channel access results is less than the fifth value, the contention window is increased.

Optionally, the fifth value may represent a threshold value of the number of successful channel access times.

The fifth value may be predefined by the protocol, determined based on preconfiguration information, or determined based on network configuration information. Optionally, the terminal device can determine the number of successful channel accesses B in the N channel access processes based on the access results of the N times of channel access, and determine the selection of CW _p based on the relationship between the fifth value and B. value.

For example, if B is greater than or equal to the fifth value, the value of CW _p can be reduced to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to CW _{min ,p} ; if B is less than the fifth value, the value of CW _p can be increased to the next available CW _p value corresponding to the channel access priority, or the value of CW _p can be set to CW _{max, p} .

The fifth value may be determined based on the first information.

For example, the higher the channel access priority, the lower the value of the fifth numerical value; the lower the channel access priority, the higher the value of the fifth numerical value. For another example, the higher the side row priority, the lower the fifth numerical value can be; the lower the side row priority, the higher the fifth numerical value can be. For another example, the lower the CBR, the lower the fifth numerical value can be; the higher the CBR, the higher the fifth numerical value can be.

The competition window can include multiple candidate values. For example, the contention window corresponding to each channel access priority may include the allowed CW _p values corresponding to each channel access priority as shown in Table 1.

Optionally, if the contention window CW _p has been increased to the maximum value CW _max,p , when it is determined that the value of CW _p needs to be increased to the next available value of CW _p , CW _max,p can be maintained unchanged; if The contention window CW _p has been reduced to the minimum value CW _min,p . When it is determined that the value of CW _p needs to be reduced to the next available value of CW _p , CW _min,p can be maintained unchanged.

Optionally, if the value of the competition window is the maximum value among the plurality of candidate values when the competition window is adjusted for Q consecutive times, the value of the competition window can be set to the maximum value of the plurality of candidate values. The minimum value among the candidate values, Q is an integer. For example, if the contention window CW _p has been increased to the maximum value CW _max,p , after the maximum contention window CW _max,p is maintained Q times, the size of the contention window CW _p can be reset to the minimum value CW _min,p .

Optionally, Q may be predefined by the protocol, determined based on preconfiguration information, or determined based on network configuration information. Alternatively, Q may be determined based on the first information.

When the terminal adjusts the size of the contention window, it can adjust the priority levels of all channel accesses. Optionally, the competition window may include multiple competition windows corresponding to multiple channel access priorities. When the terminal device adjusts the competition window, it may be adjusted according to the target channel access result (corresponding to multiple channel access priorities) The size of multiple contention windows.

For example, as shown in Table 1, the channel access priority p={1,2,3,4}. For a certain channel access priority, when the terminal device determines that it needs to adjust the contention window size according to the above method, it can The contention windows corresponding to all four channel access priorities are adjusted. For example, as shown in Table 1, assuming CW ₁ =3, CW ₂ =15, CW ₃ =63, CW ₄ =127, when the terminal equipment determines that it needs to increase the value of CW _p to the next available value of CW _p _When _{_} _{_} _{_} The device determines that it needs to lower the value of CW _p to the next available value of CW _p , and adjusts the competition windows corresponding to the above four channel access priorities. The adjusted competition windows are: CW ₁ = 3, CW ₂ =7, CW ₃ =31, CW ₄ =63.

S1120: The terminal device performs channel access in the unlicensed frequency band based on the adjusted competition window.

In this embodiment of the present application, sideline transmission of the terminal device may not support sideline feedback, or sideline feedback may be deactivated. In other words, the terminal device cannot adjust the size of the contention window based on the sidelink feedback information on the sidelink. Optionally, before S1110, sidelink transmission in the second time interval may not support sidelink feedback, or sidelink feedback may be deactivated. Wherein, the second time interval may include the first time interval.

Optionally, if the side link transmission of the terminal device in the first time interval or the second time interval supports side link feedback, the terminal device can adjust the size of the contention window based on the side link feedback. For example, if the sideline feedback includes ACK, the terminal device can reduce the value of CW _p to the next available CW _p value, or set CW _p to the minimum value CW _min,p ; if the sideline feedback does not include ACK , the terminal device can increase the value of CW _p to the next available value of CW _p , or set CW _p to the maximum value CW _max,p . Optionally, the terminal device may adjust the value of CW _p according to the ratio between the number of ACKs received within the first time interval and the total number of sideline feedback.

The method embodiments of the present application are described in detail above with reference to FIGS. 1 to 14 , and the device embodiments of the present application are described in detail below with reference to FIGS. 15 and 16 . It should be understood that the description of the method embodiments corresponds to the description of the device embodiments. Therefore, the parts not described in detail can be referred to the previous method embodiments.

Figure 15 is a schematic structural diagram of a communication device provided by an embodiment of the present application. As shown in Figure 15, the device 1500 includes, specifically as follows:

Adjustment unit 1510, configured to adjust the size of the contention window for channel access according to the target channel access result;

The access unit 1520 is configured to perform channel access in the unlicensed frequency band based on the adjusted competition window.

Optionally, the target channel access result includes a channel access result within the first time interval.

Optionally, the channel access results within the first time interval include at least one of the following: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.

Optionally, the first time interval is determined according to one of the following: the time when the device needs to perform sidelink transmission, the time when the device starts channel access, and the device determines that the contention The size of the window at the moment.

Optionally, the first time interval is the time interval between (n-T1) and (n-T2), where n is one of the following: the time when the device needs to perform sideline transmission, the The time when the device starts channel access, and the time when the device determines the size of the contention window, T1 and T2 are predefined by the protocol, determined based on preconfiguration information, determined based on network configuration information, or based on The processing time of channel access by the above device is determined, and n, T1 and T2 are integers.

Optionally, the preconfiguration information or the network configuration information includes the minimum number of slots included in the first time interval, or the minimum number of times the device performs channel access in the first time interval. .

Optionally, the preconfiguration information or the network configuration information includes a first value, and the first value represents the number of time slots in which the device performs channel access within the first time interval and the number of timeslots in the first time interval. The threshold value of the ratio of the number of time slots included in a time interval.

Optionally, the first time interval is the time interval between (n-T1) and (n-T2), where n is one of the following: the time when the device needs to perform sideline transmission, the The time when the device starts channel access and the time when the device determines the size of the contention window, T1 and T2 are determined based on first information, and the first information includes at least one of the following: channel access priority level, sidelink priority, and channel busy rate, n, T1, and T2 are integers.

Optionally, the preconfiguration information or network configuration information includes a corresponding relationship between T1 and the first information, and/or a corresponding relationship between T2 and the first information.

Optionally, the adjustment unit 1510 is specifically configured to adjust the size of the contention window according to the number of successful channel accesses within the first time interval.

Optionally, the adjustment unit 1510 is specifically configured to: if there is a difference between the number of times the device successfully accesses the channel in the first time interval and the total number of times the device performs channel access in the first time interval. The ratio of is greater than the second value, then reduce the contention window; if the number of successful channel accesses by the device within the first time interval is equal to the total number of times that the device performs channel access within the first time interval If the ratio between them is less than the second value, the competition window is increased.

Optionally, the second value is determined based on preconfiguration information or network configuration information.

Optionally, the second value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate.

Optionally, the preconfiguration information or network configuration information includes a correspondence between the second numerical value and the first information.

Optionally, the adjustment unit 1510 is specifically configured to: adjust the size of the contention window according to the number of channel access successes in the first time interval and the second information, and the third value and the contention window. Multiple candidate values have a corresponding relationship, and the second information includes a corresponding relationship between the third numerical value and the multiple candidate values.

Optionally, the second information includes a correspondence between the third value, the plurality of candidate values, and first information, where the first information includes at least one of the following: channel access priority. , sidelink priority, and channel busy rate.

Optionally, the second information is determined based on preconfiguration information or network configuration information.

Optionally, the target channel access result includes the latest N channel access results, where N is a positive integer.

Optionally, the latest N channel access results include at least one of the following: type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.

Optionally, the N is determined based on preconfiguration information or network configuration information.

Optionally, the N is determined based on first information, which includes at least one of the following: channel access priority, sidelink priority, and channel busy rate.

Optionally, the adjustment unit 1510 is specifically configured to adjust the size of the contention window according to the number of successful channel accesses in the latest N channel access results.

Optionally, the adjustment unit 1510 is specifically configured to: if the ratio between the number of channel access successes of the device in the recent N channel access results and the N is greater than or equal to a fourth value, decrease The contention window; if the ratio between the number of channel access successes of the device in the recent N channel access results and the N is less than the fourth value, increase the contention window.

Optionally, the fourth value is determined based on preconfiguration information or network configuration information.

Optionally, the fourth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate.

Optionally, the adjustment unit 1510 is specifically configured to: if the number of channel access successes of the device in the recent N channel access results is greater than or equal to the fifth value, reduce the contention window; if the device If the number of successful channel accesses in the latest N channel access results is less than the fifth value, the device increases the contention window.

Optionally, the fifth value is determined based on preconfiguration information or network configuration information.

Optionally, the fifth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate.

Optionally, the competition window includes multiple candidate values, and the adjustment unit 1510 is further configured to: if the competition window is adjusted for Q consecutive times, the values of the competition window are all the candidate values. , the value of the competition window is set to the minimum value among the multiple candidate values, and Q is an integer.

Optionally, the Q is predefined by the protocol, determined according to preconfiguration information, or determined according to network configuration information.

Optionally, the Q is determined based on first information, which includes at least one of the following: channel access priority, sidelink priority, and channel busy rate.

Optionally, the contention window includes multiple contention windows corresponding to multiple channel access priorities; wherein the adjustment unit 1510 is specifically configured to: adjust the size of the multiple contention windows according to the target channel access result. .

Optionally, before adjusting the size of the contention window for channel access according to the target channel access result, sidelink transmission in the second time interval does not support sidelink feedback, or sidelink feedback is deactivated.

Figure 16 is a schematic structural diagram of a device provided by an embodiment of the present application. The dashed line in Figure 16 indicates that the unit or module is optional. The device 1600 can be used to implement the method described in the above method embodiment. Device 1600 may be a chip or a communication device.

Apparatus 1600 may include one or more processors 1610. The processor 1610 can support the device 1600 to implement the method described in the foregoing method embodiments. The processor 1610 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor can also be another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an off-the-shelf programmable gate array (FPGA) Or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

Apparatus 1600 may also include one or more memories 1620. The memory 1620 stores a program, which can be executed by the processor 1610, so that the processor 1610 executes the method described in the foregoing method embodiment. The memory 1620 may be independent of the processor 1610 or integrated in the processor 1610.

Apparatus 1600 may also include a transceiver 1630. Processor 1610 may communicate with other devices or chips through transceiver 1630. For example, the processor 1610 can transmit and receive data with other devices or chips through the transceiver 1630.

An embodiment of the present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the communication device provided by the embodiments of the present application, and the program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

An embodiment of the present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided by the embodiments of the present application, and the program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

An embodiment of the present application also provides a computer program. The computer program can be applied to the communication device provided by the embodiments of the present application, and the computer program causes the computer to execute the methods performed by the communication device in various embodiments of the present application.

It should be understood that in the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B only based on A. B can also be determined based on A and/or other information.

It should be understood that the term "and/or" in this article is only an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and B exist simultaneously. , there are three situations of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

It should be understood that in the various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the 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 they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, e.g., the computer instructions may be transferred from a website, computer, server, or data center Transmission to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center integrated with one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVD)) or semiconductor media (e.g., solid state disks (SSD) )wait.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized by including:

The terminal device adjusts the size of the competition window for channel access according to the target channel access result;

The terminal device performs channel access in the unlicensed frequency band based on the adjusted competition window.
The method according to claim 1, wherein the target channel access result includes a channel access result within a first time interval.
The method according to claim 2, characterized in that the channel access result within the first time interval includes at least one of the following:

type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.
The method of claim 3, wherein the first time interval is determined according to one of the following:

The time when the terminal equipment needs to perform sidelink transmission, the time when the terminal equipment starts channel access, and the time when the terminal equipment determines the size of the contention window.
The method according to any one of claims 2 to 4, characterized in that the first time interval is the time interval between (n-T1) and (n-T2), where n is the following: One item: the time when the terminal equipment needs to perform sidelink transmission, the time when the terminal equipment starts channel access, and the time when the terminal equipment determines the size of the contention window, T1 and T2 are predefined by the protocol , determined based on preconfiguration information, determined based on network configuration information, or determined based on the processing time of the terminal device for channel access, n, T1 and T2 are integers.
The method according to claim 5, characterized in that the preconfiguration information or the network configuration information includes the minimum number of slots included in the first time interval, or the terminal device is in the first time interval. The minimum number of times to perform channel access within the time interval.
The method according to claim 5 or 6, characterized in that the preconfiguration information or the network configuration information includes a first value, and the first value indicates that the terminal device performs execution within the first time interval. The threshold value of the ratio of the number of time slots for channel access to the number of time slots included in the first time interval.
The method according to any one of claims 2 to 4, characterized in that the first time interval is the time interval between (n-T1) and (n-T2), where n is the following: One item: the time when the terminal equipment needs to perform sidelink transmission, the time when the terminal equipment starts channel access, and the time when the terminal equipment determines the size of the contention window, T1 and T2 are based on the first information It is determined that the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate, and n, T1, and T2 are integers.
The method according to claim 8, wherein the preconfiguration information or network configuration information includes a corresponding relationship between T1 and the first information, and/or a corresponding relationship between T2 and the first information.
The method according to any one of claims 2 to 9, characterized in that the terminal device adjusts the size of the contention window for channel access according to the target channel access result, including:

The terminal device adjusts the size of the contention window according to the number of successful channel accesses within the first time interval.
The method according to claim 10, characterized in that the terminal device adjusts the size of the contention window according to the number of successful channel accesses in the first time interval, including:

If the ratio between the number of times the terminal device successfully accesses the channel in the first time interval and the total number of times the terminal device performs channel access in the first time interval is greater than the second value, then reduce the Described competition window;

If the ratio between the number of times the terminal device successfully accesses the channel in the first time interval and the total number of times the terminal device performs channel access in the first time interval is less than the second value, then increase Big said competition window.
The method of claim 11, wherein the second value is determined based on preconfiguration information or network configuration information.
The method according to claim 11, characterized in that the second value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The method according to claim 13, characterized in that the preconfiguration information or network configuration information includes a correspondence between the second numerical value and the first information.
The method according to claim 10, characterized in that the terminal device adjusts the size of the contention window according to the number of successful channel accesses in the first time interval, including:

The terminal device adjusts the size of the contention window according to the number of successful channel accesses in the first time interval and the second information, and the third value has a corresponding relationship with multiple candidate values of the contention window, The second information includes a correspondence between the third numerical value and the plurality of candidate values.
The method of claim 15, wherein the second information includes correspondences between the third value, the plurality of candidate values, and first information, and the first information includes the following At least one: channel access priority, sidelink priority, and channel busy rate.
The method according to claim 15 or 16, characterized in that the second information is determined based on preconfiguration information or network configuration information.
The method according to claim 1, characterized in that the target channel access result includes the latest N channel access results, and N is a positive integer.
The method according to claim 18, characterized in that the latest N channel access results include at least one of the following:

type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.
The method according to claim 18 or 19, characterized in that the N is determined based on preconfiguration information or network configuration information.
The method according to claim 18 or 19, characterized in that the N is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The method according to any one of claims 18 to 21, characterized in that the terminal device adjusts the size of the contention window for channel access according to the target channel access result, including:

The terminal device adjusts the size of the contention window according to the number of successful channel accesses in the latest N channel access results.
The method according to claim 22, characterized in that the terminal device adjusts the size of the contention window according to the number of successful channel accesses in the recent N channel access results, including:

If the ratio between the number of channel access successes of the terminal device in the recent N channel access results and the N is greater than or equal to the fourth value, then reduce the contention window;

If the ratio between the number of channel access successes of the terminal device in the latest N channel access results and the N is less than the fourth value, the contention window is increased.
The method of claim 23, wherein the fourth value is determined based on preconfiguration information or network configuration information.
The method of claim 23, wherein the fourth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The method according to claim 22, characterized in that the terminal device adjusts the size of the contention window according to the number of successful channel accesses in the recent N channel access results, including:

If the number of channel access successes of the terminal device in the latest N channel access results is greater than or equal to the fifth value, the contention window is reduced;

If the number of channel access successes of the terminal device in the latest N channel access results is less than the fifth value, the contention window is increased.
The method of claim 26, wherein the fifth value is determined based on preconfiguration information or network configuration information.
The method of claim 26, wherein the fifth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The method according to any one of claims 1 to 28, wherein the competition window includes multiple candidate values, and the method further includes:

If the value of the competition window is the maximum value among the plurality of candidate values when the competition window is adjusted for Q consecutive times, then the value of the competition window is set to the maximum value among the plurality of candidate values. The minimum value of Q is an integer.
The method according to claim 29, characterized in that the Q is predefined by a protocol, determined according to preconfiguration information, or determined according to network configuration information.
The method according to claim 29, characterized in that the Q is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate .
The method according to any one of claims 1 to 31, wherein the contention window includes multiple contention windows corresponding to multiple channel access priorities;

Wherein, the terminal device adjusts the size of the contention window for channel access according to the target channel access result, including:

The terminal device adjusts the sizes of the multiple contention windows according to the target channel access result.
The method according to any one of claims 1 to 32, characterized in that, before the terminal device adjusts the size of the contention window for channel access according to the target channel access result, the sidelink transmission in the second time interval Lateral feedback is not supported, or lateral feedback is deactivated.
A communication device, characterized by including:

An adjustment unit, configured to adjust the size of the competition window for channel access according to the target channel access result;

The access unit is used for channel access in the unlicensed frequency band based on the adjusted competition window.
The apparatus according to claim 34, wherein the target channel access result includes a channel access result within a first time interval.
The device according to claim 35, wherein the channel access result within the first time interval includes at least one of the following:

type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.
The device of claim 36, wherein the first time interval is determined according to one of the following:

The time when the device needs to perform sidelink transmission, the time when the device starts channel access, and the time when the device determines the size of the contention window.
The device according to any one of claims 35 to 37, characterized in that the first time interval is the time interval between (n-T1) and (n-T2), where n is the following: One item: the time when the device needs to perform sidelink transmission, the time when the device starts channel access, and the time when the device determines the size of the contention window. T1 and T2 are predefined by the protocol and are based on the predetermined Determined by the configuration information, determined according to the network configuration information, or determined according to the processing time of the device for channel access, n, T1 and T2 are integers.
The device according to claim 38, wherein the preconfiguration information or the network configuration information includes the minimum number of slots included in the first time interval, or the device is in the first time interval. Minimum number of times to perform channel access within the interval.
The device according to claim 38 or 39, characterized in that the preconfiguration information or the network configuration information includes a first value, the first value indicates that the device performs a channel operation within the first time interval. The threshold value of the ratio of the number of accessed time slots to the number of time slots included in the first time interval.
The device according to any one of claims 35 to 37, characterized in that the first time interval is the time interval between (n-T1) and (n-T2), where n is the following: One item: the time when the device needs to perform sidelink transmission, the time when the device starts channel access, and the time when the device determines the size of the contention window, T1 and T2 are determined based on the first information, The first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate, where n, T1, and T2 are integers.
The device according to claim 41, wherein the preconfiguration information or network configuration information includes a corresponding relationship between T1 and the first information, and/or a corresponding relationship between T2 and the first information.
The device according to any one of claims 35 to 42, wherein the adjustment unit is specifically configured to: adjust the size of the contention window according to the number of successful channel accesses within the first time interval. .
The device according to claim 43, characterized in that the adjustment unit is specifically used for:

If the ratio between the number of times the device successfully accesses the channel in the first time interval and the total number of times the device performs channel access in the first time interval is greater than the second value, the contention is reduced. window;

If the ratio between the number of times the device successfully accesses the channel in the first time interval and the total number of times the device performs channel access in the first time interval is less than the second value, then increase the Describe the competition window.
The device according to claim 44, wherein the second value is determined based on preconfiguration information or network configuration information.
The device according to claim 44, characterized in that the second value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The device according to claim 46, wherein the preconfiguration information or network configuration information includes a correspondence between the second numerical value and the first information.
The device according to claim 43, characterized in that the adjustment unit is specifically used for:

The size of the contention window is adjusted according to the number of successful channel accesses in the first time interval and the second information. The third value has a corresponding relationship with multiple candidate values of the contention window. The second The information includes a correspondence between the third numerical value and the plurality of candidate values.
The device according to claim 48, wherein the second information includes a correspondence between the third value, the plurality of candidate values, and first information, and the first information includes the following At least one: channel access priority, sidelink priority, and channel busy rate.
The device according to claim 48 or 49, characterized in that the second information is determined based on preconfiguration information or network configuration information.
The device according to claim 34, wherein the target channel access result includes the latest N channel access results, and N is a positive integer.
The device according to claim 51, characterized in that the latest N channel access results include at least one of the following:

type 1 type channel access results, type 2A type channel access results, and type 2B type channel access results.
The device according to claim 51 or 52, characterized in that the N is determined based on preconfiguration information or network configuration information.
The device according to claim 51 or 52, characterized in that the N is determined according to first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The device according to any one of claims 51 to 54, characterized in that the adjustment unit is specifically configured to: adjust the contention window according to the number of successful channel accesses in the latest N channel access results. the size of.
The device according to claim 55, characterized in that the adjustment unit is specifically used for:

If the ratio between the number of channel access successes of the device in the recent N channel access results and the N is greater than or equal to the fourth value, then reduce the contention window;

If the ratio between the number of channel access successes and N in the latest N channel access results of the device is less than the fourth value, the contention window is increased.
The device according to claim 56, wherein the fourth value is determined based on preconfiguration information or network configuration information.
The device of claim 56, wherein the fourth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The device according to claim 55, characterized in that the adjustment unit is specifically used for:

If the number of channel access successes of the device in the recent N channel access results is greater than or equal to the fifth value, then reduce the contention window;

If the number of channel access successes of the device in the latest N channel access results is less than the fifth value, the contention window is increased.
The device according to claim 59, wherein the fifth value is determined based on preconfiguration information or network configuration information.
The device according to claim 59, characterized in that the fifth value is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel Busy rate.
The device according to any one of claims 34 to 61, wherein the competition window includes multiple candidate values, and the adjustment unit is also used to:

If the value of the competition window is the maximum value among the plurality of candidate values when the competition window is adjusted for Q consecutive times, then the value of the competition window is set to the maximum value among the plurality of candidate values. The minimum value of Q is an integer.
The device according to claim 62, characterized in that the Q is predefined by a protocol, determined according to preconfiguration information, or determined according to network configuration information.
The device according to claim 62, characterized in that the Q is determined based on first information, and the first information includes at least one of the following: channel access priority, sidelink priority, and channel busy rate .
The device according to any one of claims 34 to 64, wherein the contention window includes multiple contention windows corresponding to multiple channel access priorities;

Wherein, the adjustment unit is specifically configured to adjust the sizes of the plurality of contention windows according to the target channel access result.
The device according to any one of claims 34 to 65, characterized in that, before adjusting the size of the contention window for channel access according to the target channel access result, sidelink transmission in the second time interval is not supported. Lateral feedback, or deactivating lateral feedback.
A communication device, characterized in that it includes a memory and a processor, the memory is used to store programs, and the processor is used to call the program in the memory to execute as described in any one of claims 1 to 33 Methods.
A communication device, characterized by comprising a processor for calling a program from a memory to execute the method according to any one of claims 1 to 33.
A chip, characterized in that it includes a processor for calling a program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 33.
A computer-readable storage medium, characterized in that a program is stored thereon, and the program causes the computer to execute the method according to any one of claims 1 to 33.
A computer program product, characterized by comprising a program that causes a computer to execute the method according to any one of claims 1 to 33.
A computer program, characterized in that the computer program causes a computer to perform the method according to any one of claims 1 to 33.