WO2023088223A1 - Sidelink communication method and apparatus, and terminal - Google Patents

Abstract

The present application relates to the technical field of wireless communications. Disclosed are a sidelink communication method and apparatus, and a terminal. The sidelink communication method in embodiments of the present application comprises: a first terminal performs sidelink communication over a first resource; when a target exceptional case occurs, the first terminal switches to a second resource for performing sidelink communication, wherein the first resource is a dedicated sidelink resource under a licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource under an unlicensed frequency band or the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by the network side device for the first terminal; or the first resource is a sidelink resource under an unlicensed frequency band, and the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by the network side device for the first terminal.

Description

Sidelink communication method, device and terminal

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202111357030.4 filed on November 16, 2021, the entire content of which is hereby incorporated by reference.

technical field

The present application belongs to the technical field of wireless communication, and in particular relates to a sidelink communication method, device and terminal.

Background technique

In sidelink (Sidelink) communication, the terminal has two resource selection modes, one is that the base station schedules resources, that is, mode 1, and the other is that the terminal independently selects resources, that is, mode 2.

However, special cases (Exceptional Cases) may occur during the sidelink communication of the terminal. For example, the terminal in the connected state performs radio resource control (Radio Resource Control, RRC) connection during the sidelink communication on the resources scheduled by the base station. In this case, how to ensure the continuity of sidelink communication has not yet been given an effective solution.

Contents of the invention

Embodiments of the present application provide a sidelink communication method, device, and terminal, which can solve the problem that the continuity of sidelink communication cannot be guaranteed when a special situation occurs during sidelink communication.

In a first aspect, a sidelink communication method is provided, including: a first terminal performs sidelink communication on a first resource, wherein the first terminal supports sidelink communication on an unlicensed frequency band; In the case of a special target situation, the first terminal switches to the second resource for sidelink communication; wherein the first resource is a dedicated sidelink under the authorized frequency band scheduled by the network side device for the first terminal resource, the second resource is a sidelink resource of an unlicensed frequency band or the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by a network side device for the first terminal; or, the The first resource is a sidelink resource in an unlicensed frequency band, and the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by a network side device for the first terminal.

In a second aspect, a sidelink communication device is provided, which is applied to a first terminal, and the device includes: a first communication module, configured to perform sidelink communication on a first resource, wherein the first terminal supports Perform side-link communication on an unlicensed frequency band; the second communication module is used to switch to a second resource for side-link communication in the event of a special target situation; wherein, the first resource is a network-side device The dedicated sidelink resource under the licensed frequency band scheduled by the first terminal, the second resource is the sidelink resource of the unlicensed frequency band or the second resource is the authorization configured by the network side device for the first terminal A resource in a sidelink resource pool under a frequency band; or, the first resource is a sidelink resource of an unlicensed frequency band, and the second resource is a sidelink resource under a licensed frequency band configured by a network side device for the first terminal Resources in the sidelink resource pool.

In a third aspect, a terminal is provided. The terminal includes a processor, a memory, and a program or instruction stored in the memory and operable on the processor. When the program or instruction is executed by the processor The steps of the method described in the first aspect are realized.

A fourth aspect provides a terminal, including a processor and a communication interface, wherein the processor is configured to implement the steps of the method described in the first aspect, and the communication interface is configured to communicate with a network side device.

According to a fifth aspect, a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method according to the first aspect are implemented.

A sixth aspect provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, the processor is used to run programs or instructions, and implement the method as described in the first aspect A step of.

In a seventh aspect, a computer program/program product is provided, the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to implement the steps of the method described above.

In the embodiment of this application, sidelink communication on the unlicensed frequency band is supported. When sidelink communication is performed on the first resource, in the case of a target characteristic state, switch to the second resource to perform sidelink communication, wherein , the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side device for the first terminal, the second resource is a sidelink resource of an unlicensed frequency band or the second resource is a network The side device is a resource in the side link resource pool under the licensed frequency band configured by the first terminal; or, the first resource is a side link resource of an unlicensed frequency band, and the second resource is the network side device. resources in the sidelink resource pool under the authorized frequency band configured by the first terminal. Therefore, when a special situation occurs during the sidelink communication on the first resource, the sidelink communication can be switched to the second resource to ensure the continuity of the sidelink communication.

Description of drawings

FIG. 1 shows a schematic diagram of a wireless communication system to which an embodiment of the present application is applicable;

FIG. 2 shows a schematic flow diagram of a sidelink communication method provided by an embodiment of the present application;

FIG. 3 shows a schematic structural diagram of a sidelink communication device provided by an embodiment of the present application;

FIG. 4 shows a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 5 shows a schematic diagram of a hardware structure of a terminal provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and "second" distinguish objects. Generally, it is one class, and the number of objects is not limited, for example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

It is worth pointing out that the technology described in the embodiment of this application is not limited to the Long Term Evolution (Long Term Evolution, LTE)/LTE-Advanced (LTE-Advanced, LTE-A) system, and can also be used in other wireless communication systems, such as code Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency-Division Multiple Access (Single-carrier Frequency-Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technologies can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. The following description describes the New Radio (NR) system for illustrative purposes, and uses NR terminology in most of the following descriptions, but these techniques can also be applied to applications other than NR system applications, such as the 6th generation (6 ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which this embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network side device 12 . Wherein, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital Assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), mobile internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle-mounted device (VUE), Pedestrian Terminal (PUE) and other terminal-side devices, wearable devices include: smart watches, bracelets, earphones, glasses, etc. It should be noted that, the embodiment of the present application does not limit the specific type of the terminal 11 . The network side device 12 may be a base station or a core network, where a base station may be called a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service Basic Service Set (BSS), Extended Service Set (ESS), Node B, Evolved Node B (eNB), Home Node B, Home Evolved Node B, WLAN access point, WiFi node, transmission Receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only The base station in the NR system is taken as an example, but the specific type of the base station is not limited.

In this embodiment of the present application, the sidelink communication performed by the first terminal in the unlicensed frequency band means that the first terminal works in the new air interface (New Radio in Unlicensed Spectrum, NR-U) of the unlicensed spectrum to perform sidelink communication.

In the unlicensed frequency band, the radio resource control (Radio Resource Control, RRC) configures a persistent listen before talk (Listen Before Talk, LBT) failure recovery procedure (consistent LBT failure recovery procedure), if LBT detection is performed before transmission and the channel is detected to be busy, the lower layer sends an LBT failure indication (LBT failure indication) to the MAC entity.

The persistent LBT failure is based on each BWP (for per UL BWP), which is generated by the continuous LBT failure count of all uplink (Uplink, UL) transmissions from the lower layer to the MAC entity. The parameter used by the UE for LBT failure counting is LBT_COUNTER (based on each serving cell (for per Serving Cell)). RRC configures two parameters for persistent LBT failure detection (consistent LBT failure detection) in lbt-Failure Recovery Config, namely lbt-Failure Instance Max Count and lbt-Failure Detection Timer. Whenever the MAC entity receives a low-level LBT failure indication, the LBT_COUNTER count is incremented by one. When LBT_COUNTER>=lbt-Failure Instance Max Count, trigger consistent LBT failure on the active uplink bandwidth part (active UL BWP) of the serving cell, and then switch from the active UL BWP to another configuration on the same carrier of the serving cell The physical random access channel (Physical Random Access Channel, PRACH) occasion, and has not yet triggered the UL BWP of consistent LBT failure, continue to perform LBT on the UL BWP. If all UL BWPs of the serving cell trigger consistent LBT failure, then indicate consistent LBT failure to the upper layer.

In the communication protocol, the eNB/gNB can access the downlink (DL) channel of the nodeB itself, or the UE can initiate channel occupancy sharing (channel occupancy sharing) based on the UL channel access. The eNB/gNB/UE can determine a maximum COT through Channel Access Priority Class (CAPC) (as shown in Table 1). For channel access priorities p=3 and p=4, if it can be ensured that no other radio access technology (Radio Access Technology, RAT) can share this channel in the long run (as restricted by relevant protocols), T _{mcot, p} = 10ms ; Otherwise, T _{m cot, p} = 8 ms.

Table 1 Channel access priority

p	m p	cw min, p	cw max, p	T mcot, p	allowed cw p sizes
1	1	3	7	2ms	{3,7}
2	1	7	15	3ms	{7,15}
3	3	15	63	8 or 10ms	{15,31,63}
4	7	15	1023	8 or 10ms	{15,31,63,17,255,511,1023}

Some concepts and/or terms involved in the sidelink communication solution provided by the embodiment of the present application are explained below.

The sidelink communication solution provided by the embodiment of the present application will be described in detail below through some embodiments and application scenarios with reference to the accompanying drawings.

FIG. 2 shows a schematic flowchart of a sidelink communication method in an embodiment of the present application, and the method 200 may be executed by a first terminal. In other words, the method can be implemented by software or hardware installed on the first terminal. As shown in Fig. 2, the method may include the following steps.

S210, the first terminal performs sidelink communication on the first resource.

In this embodiment of the present application, the first terminal may support sidelink communication on an unlicensed frequency band.

S212. In the case of a target special situation, the first terminal switches to the second resource to perform sidelink communication.

In an embodiment of the present application, the first resource may be a dedicated sidelink resource under the licensed frequency band scheduled by the network side device for the first terminal, and the second resource may be a sidelink resource of an unlicensed frequency band Or the second resource is a resource in a sidelink resource pool under the authorized frequency band configured by the network side device for the first terminal.

That is to say, the first terminal performs sidelink communication on the dedicated sidelink resource of the licensed frequency band scheduled by the network side equipment. In the case of a target special state, the first terminal can switch to the sidelink of the unlicensed frequency band. Alternatively, the first terminal may switch to resources in the sidelink resource pool under the authorized frequency band configured by the network side device for the first terminal to perform sidelink communication.

In the above embodiments, the target conditions include but are not limited to one of the following:

(1) Radio Resource Control (Radio Resource Control, RRC) reconstruction;

(2) RRC reconfiguration;

(3) Cell switching.

In the above embodiment, when the target situation occurs, the first terminal can determine whether to switch to the sidelink resource of the unlicensed frequency band according to whether the network side device configures the sidelink resource for the first terminal. The sidelink communication is still switched to resources in the sidelink resource pool configured by the network side device for the first terminal to perform the sidelink communication.

In a possible implementation, the first resource is a dedicated sidelink resource under the authorized frequency band scheduled by the network side device, and the network side device does not configure the sidelink resource pool for the first terminal. In this case, the first terminal switches to sidelink resources in an unlicensed frequency band to perform sidelink communication. Through this possible implementation, in the case that the first terminal supports sidelink communication on the unlicensed frequency band, it can be switched to the unlicensed frequency band for sidelink communication in the case of a special situation in the licensed frequency band. link communication to ensure the continuity of side link communication.

In one or more possible implementations, after the target special situation occurs, the first terminal may wait for the recovery of the target special situation, and after waiting for a period of time, if the target special situation does not recover, the first terminal switches to Sidelink communications on unlicensed frequency bands. Therefore, when the target special situation occurs, the first terminal starts a first timer; when the first timer expires, the first terminal switches to sidelink resources of an unlicensed frequency band for Sidelink communication.

Wherein, the above-mentioned first timer may be configured by the network side device, for example, the network side device configures the first timer through signaling in advance, for example, the network side device configures the first timer through a system information block (System Information Block, SIB) broadcast , or the network side device is configured through RRC dedicated signaling. Or, it may also be stipulated by the protocol. For example, the protocol may pre-determine one or more durations of the first timer, and the first terminal may select an optional value as the timing duration of the first timer. Wherein, in the case that the agreement pre-determines multiple durations, the first terminal may autonomously select one of them as the timing duration of the first timer. For example, the first terminal may also determine whether to select a longer or shorter optional value from multiple durations according to the priority of data transmission of the current sidelink communication, which is not specifically limited in this embodiment of the present application.

In one or more possible implementations, if the network side device is not configured with the first timer and the protocol does not specify the first timer, the first terminal may , directly switch to unlicensed frequency band side-link communication.

In the above possible implementation manner, the recovery of the target special situation may refer to completion of RRC re-establishment, completion of RRC reconfiguration, completion of cell handover, and the like.

In one or more possible implementation manners, the switching of the first terminal to the sidelink resources of the unlicensed frequency band to perform sidelink communication may include: switching the first terminal to the unlicensed frequency band, and the Perform a Listen Before Talk (LBT) operation on the sidelink resources of the unlicensed frequency band, and use the obtained available resources to perform sidelink communication in the case of obtaining available resources from the unlicensed frequency band . In this possible implementation, the first terminal may use LBT to try to obtain available resources for sidelink communication, and use the obtained available resources to perform sidelink communication in the case of obtaining available resources from the unlicensed frequency band communication.

In one or more possible implementation manners, the switching of the first terminal to the sidelink resources of the unlicensed frequency band to perform sidelink communication may also include: the first terminal switches to the unlicensed frequency band to perform LBT, When obtaining available resources on the unlicensed frequency band, use the obtained available resources to perform side-link communication until the target special situation recovers, and then switch to the first resource to perform side-link communication. That is to say, in this possible implementation, after the target special situation occurs (directly or after waiting for the first timer to expire), the first terminal switches to an unlicensed frequency band to perform LBT, and tries to obtain available resources for side-link communication , in the case of obtaining available resources from the unlicensed frequency band, use the obtained available resources to perform sidelink communication, and simultaneously detect whether the target special situation under the licensed frequency band is restored, and if the target special situation is restored, Then switch to the licensed frequency band.

In one or more possible implementation manners, in order to avoid frequency switching, switching the first terminal to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes: the first terminal starts a second timer, During the operation of the second timer, execute LBT on the unlicensed frequency band, and use the obtained available resources to perform side-link communication in the case of obtaining available resources from the unlicensed frequency band; When the second timer expires and the special state of the target recovers, the first terminal switches to the first resource to perform sidelink communication. That is to say, in this possible implementation, the first terminal starts the second timer after the target special situation occurs (directly or after waiting for the first timer to expire), and switches to an unlicensed frequency band to perform LBT, trying to Obtaining available resources for side-link communication, in the case of obtaining available resources from the unlicensed frequency band, using the obtained available resources to perform side-link communication, and simultaneously detecting whether the target special situation under the authorized frequency band is restored , if the target special situation recovers and the second timer times out, switch to the authorized frequency band.

Optionally, the above-mentioned second timer may be configured by the network side device, for example, the network side device configures the second timer through signaling in advance, for example, the network side device configures the second timer through a system information block (System Information Block, SIB) Broadcast configuration, or network-side device configuration through RRC dedicated signaling. Alternatively, it may also be specified by the protocol. For example, the protocol may pre-determine one or more durations of the second timer, and the first terminal may select an optional value as the duration of the second timer. Wherein, in the case that the protocol pre-determines multiple durations, the first terminal may autonomously select one of them as the timing duration of the second timer. For example, the first terminal predicts the possible recovery time of the currently occurring target special situation according to the target special situation that has occurred, and selects an optional value close to the recovery time from multiple durations according to the recovery time. Application examples are not limited.

In one or more possible implementations, if the network side device is not configured with the second timer and the protocol does not specify the second timer, the first terminal may switch to the unlicensed frequency band and Perform LBT operations on the sidelink resources in the authorized frequency band, try to obtain available resources for sidelink communication, until the special situation of the target recovers, and then switch to sidelink communication on the resources in the authorized frequency band.

In one or more possible implementations, the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side device, and the network side device configures the sidelink resource for the first terminal In the case of a pool, the first terminal may switch to the second resource for sidelink communication according to a preset priority rule, where the second resource is the first candidate resource and the second candidate resource Among the resources with higher priority, the first candidate resource is a sidelink resource in the unlicensed frequency band, and the second candidate resource is a resource in the sidelink resource pool. That is to say, when the first terminal supports sidelink communication on an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, the first terminal can choose to switch to the sidelink resource pool. The sidelink resource in the unlicensed frequency band and the resource with the highest priority among the resources in the sidelink resource pool.

In this embodiment of the application, the preset priority rules may include one of the following:

(1) The priority of the first candidate resource is higher than the priority of the second candidate resource; for example, when the network side device only configures at least one sidelink resource of an unlicensed frequency band for the terminal , the terminal selects to switch sidelink resources of the unlicensed frequency band. Alternatively, when the network side device configures at least one unlicensed frequency band side link resource and at least one licensed frequency band resource (that is, the side link resource pool) for the terminal at the same time, the terminal preferentially selects the side link resource pool of the unlicensed frequency band. Link resources, that is, the terminal is not allowed to jump to the authorized frequency band for side-link communication.

(2) The priority of the second candidate resource is higher than that of the first candidate resource; for example, the network side device only configures at least one licensed frequency band resource (that is, the In the case of a resource pool), the terminal preferentially uses the resources of the authorized frequency band (that is, the resources in the sidelink resource pool). Or, when the network side device configures at least one sidelink resource of an unlicensed frequency band and at least one resource of a licensed frequency band for the first terminal at the same time, the terminal preferentially uses the resources of the licensed frequency band, that is, the terminal is not allowed to jump to Sidelink communications on licensed frequency bands.

Optionally, the priority of the first candidate resource being higher than the priority of the second candidate resource may include: target air interface resources in the unlicensed frequency band and sidelink resources in the unlicensed frequency band In the case of sharing, the priority of the first candidate resource is higher than the priority of the second candidate resource, wherein the target air interface is an air interface for communication between the network side device and the terminal. That is to say, when the network-side device communicates with the terminal through the New Radio in Unlicensed Spectrum (NR-U) frequency band of the unlicensed spectrum, and the network-side device configures at least one unlicensed frequency band sidechain for the first terminal at the same time In the case of channel resources and at least one licensed frequency band resource, if the target air interface resource of the unlicensed frequency band is shared with the sidelink resource of the unlicensed frequency band, for example, the network side device preempts the unlicensed frequency band resource for the terminal, then The terminal preferentially uses sidelink resources in unlicensed frequency bands for sidelink communication. Of course, it is not limited to this. In practical applications, it can also be set that the priority of the first candidate resource is higher than the priority of the second candidate resource in any case. Specifically, in this embodiment of the application Not limited.

Optionally, the priority of the second candidate resource being higher than the priority of the first candidate resource includes: a side link between the target air interface resource in the unlicensed frequency band and the unlicensed frequency band When resources are not shared, the priority of the second candidate resource is higher than the priority of the first candidate resource. That is to say, when the network-side device communicates with the terminal through the NR-U frequency band of the unlicensed spectrum, and the network-side device configures at least one sidelink resource of the unlicensed frequency band and at least one resource of the licensed frequency band for the first terminal at the same time. In this case, if the target air interface resources of the unlicensed frequency band are not shared with the sidelink resources of the unlicensed frequency band, for example, the network side device does not preempt the unlicensed frequency band resources for the terminal, the terminal will preferentially use the sidelink resources of the licensed frequency band resources in the channel resource pool for sidelink communication. Of course, it is not limited thereto. In practical applications, it can also be set that the priority of the second candidate resource is higher than the priority of the first candidate resource in any case. Specifically, in this embodiment of the application Not limited.

In another embodiment of the present application, the first resource may be a sidelink resource in an unlicensed frequency band, and the second resource is a sidelink resource in a licensed frequency band configured by a network side device for the first terminal. Resources in the resource pool. That is to say, during the process of the first terminal performing sidelink communication in the unlicensed frequency band, in the case of a special situation of the target, the first terminal can switch to the sidelink link in the authorized frequency band configured by the network side device for the first terminal. Sidelink communication is performed on resources in the link resource pool. Through this possible implementation, in the case that the first terminal supports sidelink communication on the unlicensed frequency band, it can be switched to the licensed frequency band for side link communication in the case of a special situation in the unlicensed frequency band. link communication to ensure the continuity of side link communication.

In a possible embodiment, when the first resource is a sidelink resource of an unlicensed frequency band, the target special condition includes one of the following:

(1) Consistent LBT failure (consistent LBT failure);

(2) Channel occupancy time (COT) sharing failure (COT-sharing failure); that is, the first terminal is the opposite end of the sidelink communication, that is, the second terminal fails to seize unlicensed frequency band resources.

(3) Consistent COT-sharing failure. That is, the first terminal is the opposite end of the sidelink communication, that is, the second terminal continues to fail to seize unlicensed frequency band resources, that is, the number of consecutive failures exceeds a certain value.

In a possible implementation manner, when the first resource is a sidelink resource of an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, the first The terminal switches to resources in the sidelink resource pool to perform sidelink communication.

In a possible implementation manner, when the target special condition includes persistent LBT failure, switching the first terminal to resources in the sidelink resource pool to perform sidelink communication may include: the first The terminal switches to resources in the side link resource pool to perform side link communication, and switches to a third resource to perform LBT, where the third resource has the same resource granularity as the first resource; in the When the third resource executes LBT to obtain an available LBT result, stop using the resources in the side link resource pool.

It should be noted that on the unlicensed spectrum, the terminal can perform resource selection based on different resource selection granularities, for example, perform resource selection based on carrier (carrier), or perform resource selection based on bandwidth part (Bandwidth Part, BWP), or Resource selection based on resource pool. According to its own terminal capabilities, the terminal can support sidelink (Sidelink, SL) transmission on one or more carriers on the unlicensed spectrum. Further, one carrier may include one or more bandwidth parts, and one bandwidth part may include one or more resource pools.

In the above possible implementation, when the first terminal performs sidelink communication on the first resource, if persistent LBT failure occurs, the first terminal can switch to the sidelink resource pool configured by the network side device for the first terminal Perform sidelink communication on the resources of the first resource, and at the same time, switch to another unlicensed frequency band resource with the same granularity as the first resource (that is, the third resource above) to perform LBT operations. If an available LBT result is obtained, the LBT result can be If the LBT succeeds or the LBT fails, then stop using the resources in the side link resource pool. That is to say, in the case that the network side device configures the sidelink resource pool for the first terminal, the first terminal may temporarily use the resources in the sidelink resource pool.

In another possible implementation, in order to save power consumption of the first terminal and avoid frequent execution of LBT operations, when the target special situation includes continuous LBT failure, the first terminal switches to the side link The resources in the resource pool performing the side link communication may include: the first terminal switching to the resources in the side link resource pool to perform the side link communication, and starting a third timer; during the third timer In case of timeout, the first terminal stops using resources in the sidelink resource pool, and performs LBT operation on the unlicensed frequency band.

Optionally, the above-mentioned third timer may be configured by the network side device, for example, the network side device configures the third timer through signaling in advance, for example, the network side device configures the third timer through a system information block (System Information Block, SIB) Broadcast configuration, or network-side device configuration through RRC dedicated signaling. Or, it may also be stipulated by the protocol. For example, the protocol may pre-determine one or more durations of the third timer, and the first terminal may select an optional value as the duration of the third timer. Wherein, in the case that the protocol pre-determines multiple durations, the first terminal may autonomously select one of them as the timing duration of the third timer. For example, the first terminal can select an optional value from a plurality of durations according to the current power, and if the current power is sufficient (for example, the current power is greater than a preset threshold, such as 80%), it can select one of the multiple durations For a smaller optional value, if the current power is insufficient, a larger optional value can be selected from multiple durations, which is not specifically limited in this embodiment of the application.

In one or more possible implementations, if the network side device does not configure the third timer and the protocol does not specify the third timer, the first terminal may switch to the network side device to configure the third timer for the first terminal. Sidelink communication is performed on the resources of the sidelink resource pool, and at the same time, switch to another unlicensed frequency band resource with the same granularity as the first resource (that is, the above-mentioned third resource) to perform LBT operations. If an available LBT is obtained As a result, the LBT result may be LBT success or LBT failure, then stop using the resources in the side link resource pool.

In a possible implementation, when the first resource is a sidelink resource in an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, if the target The special situation includes COT sharing failure or continuous COT sharing failure, then switching the first terminal to resources in the sidelink resource pool for sidelink communication may include: switching the first terminal to the sidelink resources in the resource pool perform sidelink communication, and preempt sidelink resources for the second terminal on the unlicensed frequency band; preempt sidelink resources for the second terminal on the unlicensed frequency band by the first terminal If the resources are successful, stop using the resources in the sidelink resource pool.

Or, in another possible implementation manner, in order to save the power of the first terminal, when the target special situation includes COT sharing failure or continuous COT sharing failure, the first terminal switches to the side link The resources in the resource pool performing the side link communication may include: the first terminal switching to the resources in the side link resource pool to perform the side link communication, and starting a fourth timer; during the fourth timer In the case of timeout, the first terminal stops using the resources in the sidelink resource pool, and performs LBT operation on the unlicensed frequency band to preempt sidelink resources for the second terminal. That is to say, in the case that the first terminal fails to perform COT sharing or continues to fail to share COT, the first terminal may switch to resources in the sidelink resource pool to perform sidelink communication (for example, in the sidelink Notify the second terminal that it failed to preempt resources on the unlicensed frequency band on resources in the channel resource pool), and start the fourth timer at the same time, and stop using the side link resources when the fourth timer times out resources in the pool, and perform LBT operations on the unlicensed frequency band to preempt sidelink resources for the second terminal.

Optionally, the above-mentioned fourth timer may be configured by the network side device, for example, the network side device configures the fourth timer through signaling in advance, for example, the network side device configures the fourth timer through a system information block (System Information Block, SIB) Broadcast configuration, or network-side device configuration through RRC dedicated signaling. Or, it may also be stipulated by the protocol. For example, the protocol may pre-determine one or more durations of the fourth timer, and the first terminal may select an optional value as the duration of the fourth timer. Wherein, in the case that the agreement pre-determines multiple durations, the first terminal may autonomously select one of them as the timing duration of the fourth timer. For example, the first terminal can select an optional value from a plurality of durations according to the current power, and if the current power is sufficient (for example, the current power is greater than a preset threshold, such as 80%), it can select one of the multiple durations For a smaller optional value, if the current power is insufficient, a larger optional value can be selected from multiple durations, which is not specifically limited in this embodiment of the application.

In one or more possible implementations, if the network side device is not configured with the fourth timer and the protocol does not specify the fourth timer, switch to resources in the side link resource pool for bypass link communication, and preempt sidelink resources for the second terminal on the unlicensed frequency band, and then when the first terminal succeeds in preempting sidelink resources for the second terminal on the unlicensed frequency band, Stop using resources in the sidelink resource pool.

In an optional implementation manner of the embodiment of this application, the first resource is a sidelink resource in an unlicensed frequency band, and the network side device does not configure the sidelink resource pool for the first terminal. In this case, the first terminal reports the abnormal state of the target to the network side device. For example, in the case of continuous COT sharing failure, the first terminal may report consistent COT-sharing failure to the base station, and the base station instructs UE1 to switch to mode1 or mode2 of the SL frequency band for sidelink communication.

In this embodiment of the present application, the side link resource pool may include a common resource pool and a special resource pool, wherein the resources in the common resource pool refer to the resources in the RRC idle state, inactive state, or connected state of the terminal. The resources that are allowed to be used for sidelink transmission at the main frequency point, and the special resource pool includes the resources that the terminal is allowed to use when the target special situation occurs in the sidelink, that is, the special resource The pool is a resource pool specially configured by the network side device for the special target situation, and the resources in it are reserved by the network side device. When the target special situation occurs, the terminal can use the resources in the special resource pool for side chaining road communication.

In the above embodiment, if the sidelink resource pool is an ordinary resource pool under the licensed frequency band, when the first terminal uses resources in the sidelink resource pool to perform sidelink communication, the first terminal can Apply to the network-side device first, and use the applied resources for communication after obtaining the consent of the network-side device. And if the sidelink resource pool is a special resource pool under the licensed frequency band, the first terminal can randomly use one of the resources for sidelink communication, because the resources in the special resource pool may be configured at the same time It is a special resource pool of other terminals. In order to avoid conflicts as much as possible, the first terminal can only use the resources in the special resource pool for a short time.

The technical solutions provided by the embodiments of the present application will be described below by taking the sidelink resource pool as a special resource pool of authorized frequency bands as an example.

In the following description, for the convenience of distinction, the target special situation that occurs when the terminal works in the licensed frequency band is called the traditional special situation, and the target special situation that occurs when the terminal works in the unlicensed frequency band is called the new special situation. Wherein, the traditional special situation includes RRC reestablishment, RRC reconfiguration, cell switching and so on. The new special conditions include special conditions in SL-U scenarios, such as consistent LBT failure, (consistent) COT-sharing failure, etc. If no prefix is specified, special conditions include traditional special conditions and new special conditions.

For ease of distinction in the following embodiments, the SL frequency band refers to the licensed frequency band used for SL communication, and the SL-U frequency band refers to the unlicensed frequency band used for SL communication. The SL (frequency band) resources refer to the resources/candidate resources allocated by the network to the UE in the licensed frequency band, and the SL-U (frequency band) resources refer to the resources/candidate resources allocated by the network to the UE in the unlicensed frequency band. In addition, the SL frequency band special resource pool is also a kind of SL resource.

In the following embodiments, the recovery of the special situation can refer to the completion of RRC reconstruction, completion of RRC reconfiguration, completion of cell switching, etc. for the traditional special situation, and can refer to the completion of the new special situation from consistent LBT failure, (consistent ) Recovery from COT-sharing failure, that is, LBT success and COT-sharing success.

In a possible embodiment, when a special situation occurs to the UE working in the SL frequency band mode1 resource allocation mode, the UE may perform any one of the following (1) to (3) processing.

(1) If the network only configures a special resource pool for the SL frequency band for the UE, the UE can use the special resource pool for a short time before the traditional special situation recovers.

(2) If the network only configures SL-U frequency band resources for the UE, the UE can perform any one of the following 1 to 3 processes.

1. If the network configures the timer timer-1 for the UE, the UE waits for the special situation to recover before the timer-1 times out; if the timer-1 times out, the UE switches to the SL-U frequency band to work, and the SL-U Execute LBT operations on U resources and try to obtain available resources for SL-U communication. Wherein, the timer-1 may be configured by SIB broadcast, or configured through RRC dedicated signaling.

2. If the UE is configured with a local timer timer-2, start the local timer time-2, wherein the value range or value range of timer-2 is fixed, and the value range or value range may be agreed upon in the protocol. Before timer-2 times out, the UE waits for the special situation to recover. If timer-2 times out, the UE switches to the SL-U frequency band to work, performs LBT operations on the SL-U resources configured by the network, and tries to obtain available resources for SL-U. U Communication.

3. If the network does not configure the timer timer-1 for the UE, and the UE does not configure the local timer timer-2, the UE will directly switch to the SL-U frequency band and perform LBT operations on the SL-U resources configured by the network , trying to get available resources for SL-U communication.

(3) If the network configures the SL frequency band special resource pool and SL-U frequency band resources for the UE at the same time, the UE uses the SL resources or SL-U resources preferentially according to the preset SL resource and SL-U resource priority rules.

Wherein, the preset SL resources and SL-U resource priority rules may include at least one of the following:

Rule 1: When the network only allocates at least one SL-U resource, or allocates at least one SL and at least one SL-U resource at the same time, the SL-U resource is always used first, that is, the UE is not allowed to jump to the SL frequency band go to work;

Rule 2: When the network only allocates at least one SL resource, or at least one SL and at least one SL-U resource for the UE, the SL resource is always used first, that is, the UE is not allowed to jump to the SL-U frequency band to work ;

Rule 3: When the network communicates with the UE through the NR-U frequency band, and both SL and SL-U resources are allocated to the UE, if the NR-U frequency band resources are shared with the SL-U resources, the UE will preferentially use the SL-U resources for SL communication, otherwise SL resources are used preferentially for SL communication.

In another possible embodiment, if a special situation occurs to the UE working in the SL frequency band mode1 resource allocation mode, if SL-U resources are configured, the UE will first switch to the SL-U frequency band to work, and then restore the SL frequency band based on some conditions mode1 mode works. Specifically, the UE may perform the following processing:

(1) If the network only configures a special resource pool for the SL frequency band for the UE, the UE can use the special resource pool for a short time before the traditional special situation recovers.

(2) If the network only configures SL-U frequency band resources for the UE, the UE can perform any one of the following 1 to 3 processing.

1. The UE directly switches to work in the SL-U frequency band, performs LBT operations on the SL-U resources configured by the network, and tries to obtain available resources for SL-U communication until the UE recovers from the special situation.

2. The UE switches to work in the SL-U frequency band, and starts the local timer timer-3. When timer-3 times out, the UE recovers from the special situation.

3. If the network configures the timer timer-4 for the UE, when the timer-4 times out, and the UE recovers from the special situation.

(3) If the network configures the SL frequency band special resource pool and SL-U frequency band resources for the UE at the same time, the UE can use the SL resources or SL-U resources preferentially according to the above SL resource and SL-U resource priority rules.

Wherein, the value of timer-2 may be a fixed value, or may be an optional value selected from a set of fixed value lists. The timer-3 may be configured by SIB broadcast, or configured through RRC dedicated signaling.

In yet another possible embodiment, if a special situation occurs when the UE works in the SL-U frequency band, corresponding processing may be performed according to different special situations.

(1) When UE has consistent LBT failure

In this case, if the network configures a special resource pool for the SL frequency band for the UE, the UE can temporarily use the special resource pool for the SL frequency band. Specifically, the UE can perform any of the following operations:

(1) If the UE obtains an available LBT result after switching LBT resources at the same LBT resource granularity, the UE stops using the SL frequency band special resource pool.

(2) If the network configures timer-5, when timer-5 times out, the UE stops using the special resource pool of the SL frequency band and resumes the LBT operation on the SL-U frequency band.

If the network does not configure a special resource pool for the SL frequency band for the UE, the UE reports a consistent LBT failure to the base station, and the base station instructs the UE to work in mode1 or mode2 of the SL frequency band.

(2) When a (consistent) COT-sharing failure occurs when UE1 preempts SL-U resources for UE2, UE1 can perform corresponding operations according to the following two situations in 1 or 2.

1. If the network configures a special resource pool for the SL frequency band for UE1, the following operations can be performed:

(1) UE1 can temporarily use the special resource pool of the SL frequency band. If UE1 recovers from (consistent) COT-sharing failure, UE1 stops using the SL frequency band special resource pool.

(2) If timer-6 is configured on the network, when timer-6 times out, UE1 stops using the special resource pool of the SL frequency band and resumes LBT operation on the SL-U frequency band to preempt SL-U resources for UE2.

2. If the network does not configure a special resource pool for the SL frequency band for UE1, UE1 reports consistent COT-sharing failure to the base station, and the base station instructs UE1 to work in mode1 or mode2 of the SL frequency band.

Wherein, the timer-4 and timer-5 may be configured by SIB broadcast, or configured through RRC dedicated signaling.

It should be noted that, the sidelink communication method provided in the embodiment of the present application may be executed by a sidelink communication device, or a control module in the sidelink communication device for executing the sidelink communication method. In the embodiment of the present application, the sidelink communication device provided in the embodiment of the present application is described by taking the sidelink communication device executing the sidelink communication method as an example.

Fig. 3 shows a schematic structural diagram of a side-link communication device provided by an embodiment of the present application. The device 300 can be applied to a first terminal. As shown in Fig. 3 , the device 300 mainly includes a first communication module 301 and a second communication module 302 .

In the embodiment of the present application, the first communication module 301 is configured to perform side-link communication on the first resource, wherein the first terminal supports side-link communication on an unlicensed frequency band; the second communication module 302, It is used to switch to the second resource for sidelink communication in the event of a special situation of the target; wherein, the first resource is a dedicated sidelink resource under the authorized frequency band scheduled by the network side device for the first terminal The second resource is a sidelink resource of an unlicensed frequency band or the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by a network side device for the first terminal; or, the The first resource is a sidelink resource in an unlicensed frequency band, and the second resource is a resource in a sidelink resource pool under a licensed frequency band configured by a network side device for the first terminal.

In a possible implementation manner, the second communication module 302 switches to the second resource to perform sidelink communication, including:

Switching to an unlicensed frequency band when the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side device, and the network side device has not configured the sidelink resource pool for the first terminal sidelink resources for sidelink communication.

In a possible implementation, the second communication module 302 switches to sidelink resources in an unlicensed frequency band to perform sidelink communication, including:

When the target special situation occurs, start a first timer;

When the first timer expires, switch to sidelink resources in the unlicensed frequency band to perform sidelink communication.

In a possible implementation manner, the first timer is configured by the network side device or the first timer is agreed by a protocol.

In a possible implementation manner, the second communication module 302 switching to sidelink resources in an unlicensed frequency band to perform sidelink communication includes:

performing listen-before-talk LBT on the unlicensed frequency band, and in the case of acquiring available resources from the unlicensed frequency band, using the acquired available resources to perform side-link communication until the target special situation recovers, Then switch to the first resource to perform sidelink communication.

In a possible implementation manner, the second communication module 302 switching to sidelink resources in an unlicensed frequency band to perform sidelink communication includes:

Start a second timer, during which the second timer is running, perform listen-before-talk LBT on the unlicensed frequency band, and use the acquired available resources for sidelink communication;

When the second timer expires and the special state of the target recovers, switch to the first resource to perform sidelink communication.

In a possible implementation manner, the second timer is configured by the network side device or the second timer is agreed by a protocol.

In a possible implementation manner, the second communication module 302 switches to the second resource to perform sidelink communication, including:

When the first resource is a dedicated sidelink resource under the authorized frequency band scheduled by the network side device, and the network side device configures the sidelink resource pool for the first terminal, according to the preset priority The rule is to switch to the second resource to perform sidelink communication, wherein the second resource is a resource with higher priority among the first candidate resource and the second candidate resource, and the first candidate resource is The sidelink resource in the unlicensed frequency band, the second candidate resource is a resource in the sidelink resource pool.

In a possible implementation manner, the preset priority rule includes one of the following:

The priority of the first candidate resource is higher than the priority of the second candidate resource;

The priority of the second candidate resource is higher than the priority of the first candidate resource.

In a possible implementation manner, the priority of the first candidate resource is higher than the priority of the second candidate resource, including: the target air interface resource in the unlicensed frequency band and the target air interface resource in the unlicensed frequency band In the case of sidelink resource sharing, the priority of the first candidate resource is higher than the priority of the second candidate resource, wherein the target air interface is an air interface for communication between the network side device and the terminal;

The priority of the second candidate resource is higher than the priority of the first candidate resource, including: the target air interface resource in the unlicensed frequency band is not shared with the sidelink resource in the unlicensed frequency band In the case of , the priority of the second candidate resource is higher than the priority of the first candidate resource.

In a possible implementation manner, the target abnormality includes one of the following:

RRC reconstruction;

RRC reconfiguration;

Cell switching.

In a possible implementation manner, when the first resource is a sidelink resource of an unlicensed frequency band, the target special condition includes one of the following:

Sustained LBT failure;

Channel occupancy time COT sharing failed;

Persistent COT sharing failed.

In a possible implementation manner, the second communication module 302 switches to the second resource to perform sidelink communication, including:

When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, switching to resources in the sidelink resource pool for sidelink communication.

In a possible implementation manner, the second communication module 302 switches to resources in the sidelink resource pool to perform sidelink communication, including:

In the case that the target special condition includes persistent LBT failure, switch to resources in the sidelink resource pool to perform sidelink communication, and switch to a third resource to perform LBT, wherein the third resource is the same as the The resource granularity of the above-mentioned first resource is the same;

When the third resource executes LBT to obtain an available LBT result, stop using resources in the sidelink resource pool.

In a possible implementation manner, the second communication module 302 switches to resources in the sidelink resource pool to perform sidelink communication, including:

In the case that the target special situation includes continuous LBT failure, switching to resources in the sidelink resource pool for sidelink communication, and starting a third timer;

When the third timer expires, stop using resources in the sidelink resource pool, and perform LBT operation on the unlicensed frequency band.

In a possible implementation manner, the third timer is configured by the network side device or the third timer is agreed by a protocol.

In a possible implementation manner, the second communication module 302 switches to resources in the sidelink resource pool to perform sidelink communication, including:

When the target special situation includes COT sharing failure or continuous COT sharing failure, switching to resources in the sidelink resource pool for sidelink communication, and preempting for the second terminal on the unlicensed frequency band sidelink resources;

In a case where the sidelink resources are successfully preempted for the second terminal on the unlicensed frequency band, stop using the resources in the sidelink resource pool.

In a possible implementation manner, the second communication module 302 switches to resources in the sidelink resource pool to perform sidelink communication, including:

In the case that the target special situation includes COT sharing failure or continuous COT sharing failure, switching to resources in the sidelink resource pool for sidelink communication, and starting a fourth timer;

When the fourth timer expires, stop using resources in the sidelink resource pool, and perform LBT operation on the unlicensed frequency band, to preempt sidelink resources for the second terminal.

In a possible implementation manner, the fourth timer is configured by the network side device or the fourth timer is agreed by a protocol.

In a possible implementation manner, the second communication module 302 is also configured to:

When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device does not configure the sidelink resource pool for the first terminal, report the target abnormality to the network side device situation.

The sidelink communication device in the embodiment of the present application may be a device, or may be a component, an integrated circuit, or a chip in a terminal. The device may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include but not limited to the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television ( television, TV), teller machines or self-service machines, etc., are not specifically limited in this embodiment of the present application.

The sidelink communication device in this embodiment of the present application may be a device with an operating system. The operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, which are not specifically limited in this embodiment of the present application.

The sidelink communication device provided in the embodiment of the present application can implement various processes implemented in the method embodiment in FIG. 2 and achieve the same technical effect. To avoid repetition, details are not repeated here.

Optionally, as shown in FIG. 4 , this embodiment of the present application further provides a communication device 400, including a processor 401, a memory 402, and programs or instructions stored in the memory 402 and operable on the processor 401, For example, when the communication device 400 is a terminal, when the program or instruction is executed by the processor 401, each process of the above embodiment of the sidelink communication method can be realized, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the processor is used to implement each process of the above embodiment of the sidelink communication method, and the communication interface is used to communicate with an external communication device. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 5 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.

The terminal 500 includes but not limited to: a radio frequency unit 501, a network module 502, an audio output unit 503, an input unit 504, a sensor 505, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, and a processor 510, etc. .

Those skilled in the art can understand that the terminal 500 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 510 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 5 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange different components, which will not be repeated here.

It should be understood that, in the embodiment of the present application, the input unit 504 may include a graphics processing unit (Graphics Processing Unit, GPU) 5041 and a microphone 5042, and the graphics processing unit 5041 is used in a video capture mode or an image capture mode by an image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing. The display unit 506 may include a display panel 5061, and the display panel 5061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 507 includes a touch panel 5071 and other input devices 5072 . The touch panel 5071 is also called a touch screen. The touch panel 5071 may include two parts, a touch detection device and a touch controller. Other input devices 5072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

In the embodiment of the present application, the radio frequency unit 501 receives the downlink data from the network side device, and processes it to the processor 510; in addition, sends the uplink data to the network side device. Generally, the radio frequency unit 501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 509 can be used to store software programs or instructions as well as various data. The memory 509 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playback function, an image playback function, etc.) and the like. In addition, the memory 509 may include a high-speed random access memory, and may also include a non-transitory memory, wherein the non-transitory memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. For example at least one disk storage device, flash memory device, or other non-transitory solid state storage device.

The processor 510 may include one or more processing units; optionally, the processor 510 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, application programs or instructions, etc., Modem processors mainly handle wireless communications, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 510 .

Wherein, the radio frequency unit 501 is configured to perform side-link communication on the first resource, wherein the terminal supports side-link communication on an unlicensed frequency band; switching to the second resource for sidelink communication;

Wherein, the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side equipment for the first terminal, and the second resource is a sidelink resource of an unlicensed frequency band or the second resource is The network-side device configures resources in the sidelink resource pool under the authorized frequency band for the first terminal; or, the first resource is a sidelink resource of an unlicensed frequency band, and the second resource is a sidelink resource of the network-side device resources in the sidelink resource pool under the authorized frequency band configured for the first terminal.

In the embodiment of this application, the first terminal that supports sidelink communication on the unlicensed frequency band switches to the second resource for sidelink communication when the target characteristic state occurs when the first resource is performing sidelink communication. link communication, wherein the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side equipment for the first terminal, and the second resource is a sidelink resource of an unlicensed frequency band or the The second resource is a resource in the sidelink resource pool under the authorized frequency band configured by the network side device for the first terminal; or, the first resource is a sidelink resource in an unlicensed frequency band, and the second resource resources in the sidelink resource pool under the authorized frequency band configured by the network side device for the first terminal. Therefore, a processing scheme for a terminal that supports sidelink communication on an unlicensed frequency band when a special state occurs is given.

The embodiment of the present application also provides a readable storage medium, the readable storage medium stores a program or an instruction, and when the program or instruction is executed by the processor, each process of the above-mentioned side link communication method embodiment is implemented, and can To achieve the same technical effect, in order to avoid repetition, no more details are given here.

Wherein, the processor is the processor in the terminal described in the foregoing embodiments. The readable storage medium includes computer readable storage medium, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the implementation of the above-mentioned side link communication method Each process of the example, and can achieve the same technical effect, in order to avoid repetition, will not repeat them here.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

The embodiment of the present application also provides a computer program/program product, the computer program/program product is stored in a non-transitory storage medium, and the program/program product is executed by at least one processor to realize the above-mentioned side chain Each process of the embodiment of the road communication method can achieve the same technical effect, so in order to avoid repetition, details are not repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims (32)

1. A sidelink communication method, comprising:

   The first terminal performs sidelink communication on the first resource;

   In the case of a target special situation, the first terminal switches to the second resource for sidelink communication;

   Wherein, the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side equipment for the first terminal, and the second resource is a sidelink resource of an unlicensed frequency band or the second resource is The network-side device configures resources in the sidelink resource pool under the authorized frequency band for the first terminal; or, the first resource is a sidelink resource of an unlicensed frequency band, and the second resource is a sidelink resource of the network-side device resources in the sidelink resource pool under the authorized frequency band configured for the first terminal.
2. The method according to claim 1, wherein switching the first terminal to the second resource for sidelink communication comprises:

   If the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network-side device, and the network-side device has not configured the sidelink resource pool for the first terminal, the first terminal Switch to sidelink resources in unlicensed frequency bands for sidelink communication.
3. The method according to claim 2, wherein switching the first terminal to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes:

   The first terminal starts a first timer when the target special situation occurs;

   When the first timer expires, the first terminal switches to a sidelink resource of an unlicensed frequency band to perform sidelink communication.
4. The method according to claim 3, wherein the first timer is configured by the network side device or the first timer is agreed upon in a protocol.
5. The method according to any one of claims 2 to 4, wherein switching the first terminal to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes:

   The first terminal performs listen-before-talk LBT on the unlicensed frequency band, and in the case of obtaining available resources from the unlicensed frequency band, uses the obtained available resources to perform side-link communication until the The target special situation recovers, and then switches to the first resource to perform side-link communication.
6. The method according to any one of claims 2 to 4, wherein switching the first terminal to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes:

   The first terminal starts a second timer, and during the running of the second timer, performs listen-before-talk LBT on the unlicensed frequency band, and obtains available resources from the unlicensed frequency band, performing sidelink communications using said available resources obtained;

   When the second timer expires and the special state of the target recovers, the first terminal switches to the first resource to perform sidelink communication.
7. The method according to claim 1, wherein switching the first terminal to the second resource for sidelink communication comprises:

   If the first resource is a dedicated sidelink resource under the authorized frequency band scheduled by the network side device, and the network side device configures the sidelink resource pool for the first terminal, the first terminal according to A preset priority rule, switching to the second resource to perform side-link communication, wherein the second resource is a resource with a higher priority among the first candidate resource and the second candidate resource, and the second resource A candidate resource is a sidelink resource in the unlicensed frequency band, and the second candidate resource is a resource in the sidelink resource pool.
8. The method according to claim 7, wherein the preset priority rules include one of the following:

   The priority of the first candidate resource is higher than the priority of the second candidate resource;

   The priority of the second candidate resource is higher than the priority of the first candidate resource.
9. The method of claim 8, wherein,

   The priority of the first candidate resource is higher than the priority of the second candidate resource, including: when the target air interface resource of the unlicensed frequency band is shared with the sidelink resource of the unlicensed frequency band , the priority of the first candidate resource is higher than the priority of the second candidate resource, wherein the target air interface is an air interface for communication between the network side device and the terminal;

   The priority of the second candidate resource is higher than the priority of the first candidate resource, including: the target air interface resource in the unlicensed frequency band is not shared with the sidelink resource in the unlicensed frequency band In the case of , the priority of the second candidate resource is higher than the priority of the first candidate resource.
10. The method according to any one of claims 2 to 9, wherein the target special condition comprises one of the following:

    Radio resource control RRC reconstruction;

    RRC reconfiguration;

    Cell switching.
11. The method according to claim 1, wherein, when the first resource is a sidelink resource of an unlicensed frequency band, the target special condition includes one of the following:

    Sustained LBT failure;

    Channel occupancy time COT sharing failed;

    Persistent COT sharing failed.
12. The method according to claim 11, wherein switching the first terminal to the second resource for sidelink communication comprises:

    When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, the first terminal switches to the sidelink The resources in the resource pool perform sidelink communication.
13. The method according to claim 12, wherein switching the first terminal to resources in the sidelink resource pool to perform sidelink communication comprises:

    In the case that the target special situation includes continuous LBT failure, the first terminal switches to resources in the sidelink resource pool to perform sidelink communication, and switches to a third resource to perform LBT, wherein the The resource granularity of the third resource is the same as that of the first resource;

    When the third resource executes LBT to obtain an available LBT result, stop using resources in the sidelink resource pool.
14. The method according to claim 12, wherein switching the first terminal to resources in the sidelink resource pool to perform sidelink communication comprises:

    In the case that the target special condition includes persistent LBT failure, the first terminal switches to resources in the sidelink resource pool to perform sidelink communication, and starts a third timer;

    When the third timer expires, the first terminal stops using resources in the sidelink resource pool, and performs LBT on the unlicensed frequency band.
15. The method according to claim 12, wherein switching the first terminal to resources in the sidelink resource pool to perform sidelink communication comprises:

    When the target special situation includes COT sharing failure or continuous COT sharing failure, the first terminal switches to resources in the sidelink resource pool to perform sidelink communication, and performs sidelink communication on the unlicensed frequency band Seize sidelink resources for the second terminal;

    When the first terminal succeeds in preempting sidelink resources for the second terminal on the unlicensed frequency band, stop using the resources in the sidelink resource pool.
16. The method according to claim 12, wherein switching the first terminal to resources in the sidelink resource pool to perform sidelink communication comprises:

    When the target special situation includes COT sharing failure or continuous COT sharing failure, the first terminal switches to resources in the sidelink resource pool to perform sidelink communication, and starts a fourth timer;

    When the fourth timer expires, the first terminal stops using resources in the sidelink resource pool, and performs LBT operations on the unlicensed frequency band to preempt the sidelink for the second terminal resource.
17. The method according to claim 11, wherein the method further comprises:

    When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device has not configured the sidelink resource pool for the first terminal, the first terminal sends the network side link resource to the network side device Report the special condition of the target.
18. The method according to any one of claims 1 to 17, wherein the side link resource pool includes: a normal resource pool and a special resource pool, wherein the normal resource pool includes the terminal being idle in the radio resource control RRC state, inactive state, or connected state, which are different from the resources allowed for sidelink transmission at the main frequency point, and the sidelink special resource pool includes the terminal that is allowed under the special target situation of the sidelink resources used.
19. A sidelink communication device, applied to a first terminal, the device comprising:

    A first communication module, configured to perform sidelink communication on the first resource;

    The second communication module is configured to switch to the second resource to perform side-link communication in the event of a special situation of the target;

    Wherein, the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side equipment for the first terminal, and the second resource is a sidelink resource of an unlicensed frequency band or the second resource is The network-side device configures resources in the sidelink resource pool under the authorized frequency band for the first terminal; or, the first resource is a sidelink resource of an unlicensed frequency band, and the second resource is a sidelink resource of the network-side device resources in the sidelink resource pool under the authorized frequency band configured for the first terminal.
20. The device according to claim 19, wherein the second communication module switches to the second resource to perform side-link communication, comprising:

    Switching to an unlicensed frequency band when the first resource is a dedicated sidelink resource under the licensed frequency band scheduled by the network side device, and the network side device has not configured the sidelink resource pool for the first terminal sidelink resources for sidelink communication.
21. The device according to claim 20, wherein the second communication module switches to sidelink resources in an unlicensed frequency band to perform sidelink communication, comprising:

    When the target special situation occurs, start a first timer;

    When the first timer expires, switch to sidelink resources in the unlicensed frequency band to perform sidelink communication.
22. The device according to any one of claims 19 to 21, wherein switching the second communication module to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes:

    performing listen-before-talk LBT on the unlicensed frequency band, and in the case of acquiring available resources from the unlicensed frequency band, using the acquired available resources to perform side-link communication until the target special situation recovers, Then switch to the first resource to perform sidelink communication.
23. The device according to any one of claims 19 to 21, wherein switching the second communication module to a sidelink resource in an unlicensed frequency band to perform sidelink communication includes:

    Start a second timer, during which the second timer is running, perform listen-before-talk LBT on the unlicensed frequency band, and use the acquired Available resources for sidelink communication;

    When the second timer expires and the special state of the target recovers, switch to the first resource to perform sidelink communication.
24. The device according to claim 19, wherein the second communication module switches to the second resource to perform side-link communication, comprising:

    When the first resource is a dedicated sidelink resource under the authorized frequency band scheduled by the network side device, and the network side device configures the sidelink resource pool for the first terminal, according to the preset priority The rule is to switch to the second resource to perform sidelink communication, wherein the second resource is a resource with higher priority among the first candidate resource and the second candidate resource, and the first candidate resource is The sidelink resource in the unlicensed frequency band, the second candidate resource is a resource in the sidelink resource pool.
25. The device according to claim 19, wherein the second communication module switches to the second resource to perform side-link communication, comprising:

    When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device configures the sidelink resource pool for the first terminal, switching to resources in the sidelink resource pool for sidelink communication.
26. The device according to claim 25, wherein the second communication module switches to resources in the sidelink resource pool to perform sidelink communication, comprising:

    In the case that the target special condition includes persistent LBT failure, switch to resources in the sidelink resource pool to perform sidelink communication, and switch to a third resource to perform LBT, wherein the third resource is the same as the The resource granularity of the above-mentioned first resource is the same;

    When the third resource executes LBT to obtain an available LBT result, stop using resources in the sidelink resource pool.
27. The device according to claim 25, wherein the second communication module switches to resources in the sidelink resource pool to perform sidelink communication, comprising:

    In the case that the target special situation includes continuous LBT failure, switching to resources in the sidelink resource pool for sidelink communication, and starting a third timer;

    When the third timer expires, stop using resources in the sidelink resource pool, and perform LBT on the unlicensed frequency band.
28. The device according to claim 25, wherein the second communication module switches to resources in the sidelink resource pool to perform sidelink communication, comprising:

    When the target special situation includes COT sharing failure or continuous COT sharing failure, switching to resources in the sidelink resource pool for sidelink communication, and preempting for the second terminal on the unlicensed frequency band sidelink resources;

    In a case where the sidelink resources are successfully preempted for the second terminal on the unlicensed frequency band, stop using the resources in the sidelink resource pool.
29. The device according to claim 25, wherein the second communication module switches to resources in the sidelink resource pool to perform sidelink communication, comprising:

    In the case that the target special situation includes COT sharing failure or continuous COT sharing failure, switching to resources in the sidelink resource pool for sidelink communication, and starting a fourth timer;

    When the fourth timer expires, stop using resources in the sidelink resource pool, and perform LBT operation on the unlicensed frequency band, to preempt sidelink resources for the second terminal.
30. The device according to claim 25, wherein the second communication module is further used for:

    When the first resource is a sidelink resource of an unlicensed frequency band, and the network side device does not configure the sidelink resource pool for the first terminal, report the target abnormality to the network side device situation.
31. A terminal, comprising a processor, a memory, and a program or instruction stored on the memory and operable on the processor, when the program or instruction is executed by the processor, any of claims 1 to 18 can be realized. A step of the sidelink communication method described herein.
32. A readable storage medium, storing programs or instructions on the readable storage medium, and implementing the steps of the side-link communication method according to any one of claims 1 to 18 when the programs or instructions are executed by a processor.

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