Sidelink communication method, apparatus, and terminal

Abstract

The application discloses a kind of sidelink communication method, device and terminal, belong to wireless communication technical field, the sidelink communication method of the embodiment of the application, including: first terminal carries out sidelink communication in first resource;In the case where target special situation occurs, the first terminal switches to second resource and carries out sidelink communication;Wherein, the first resource is that network side equipment is scheduled in the dedicated sidelink resource under the licensed frequency band for the first terminal, and the second resource is the sidelink resource of unlicensed frequency band or the second resource is the resource in the sidelink resource pool under the licensed frequency band configured by network side equipment for the first terminal;Or, the first resource is the sidelink resource of unlicensed frequency band, and the second resource is the resource in the sidelink resource pool under the licensed frequency band configured by network side equipment for the first terminal.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wireless communication, and particularly relates to a sidelink communication method, device and terminal. BACKGROUND

[0002] In sidelink communication, there are two resource selection modes for a terminal, one is base station scheduling resources, i.e., mode 1, and the other is terminal autonomous resource selection, i.e., mode 2.

[0003] However, exceptional cases may occur in the sidelink communication process of the terminal, for example, a connected terminal performs a radio resource control (RRC) connection reestablishment process in the sidelink communication process on the base station scheduled resources, and in this case, how to ensure the continuity of sidelink communication has not yet been given an effective solution. SUMMARY

[0004] 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 ensured when exceptional cases occur in the sidelink communication process.

[0005] In a first aspect, a sidelink communication method is provided, comprising: a first terminal performing sidelink communication on a first resource, wherein the first terminal supports sidelink communication on an unlicensed frequency band; in the case of occurrence of a target exceptional case, the first terminal switches to a second resource to perform sidelink communication; wherein the first resource is a dedicated sidelink resource in a licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource in an unlicensed frequency band or the second resource is a resource in a sidelink resource pool in a licensed 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 is a resource in a sidelink resource pool in a licensed frequency band configured by the network side device for the first terminal.

[0006] In a second aspect, a sidelink communication device is provided, which is applied to a first terminal, and the device comprises: a first communication module, configured to perform sidelink communication on a first resource, wherein the first terminal supports sidelink communication on an unlicensed frequency band; and a second communication module, configured to switch to a second resource to perform sidelink communication when a target special situation occurs; wherein the first resource is a dedicated sidelink resource on a licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource on an unlicensed frequency band or the second resource is a resource in a sidelink resource pool on a licensed frequency band configured by the network side device for the first terminal; or the first resource is a sidelink resource on an unlicensed frequency band, and the second resource is a resource in a sidelink resource pool on a licensed frequency band configured by the network side device for the first terminal.

[0007] In a third aspect, a terminal is provided, which comprises a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions are executed by the processor to implement the steps of the method according to the first aspect.

[0008] In a fourth aspect, a terminal is provided, which comprises a processor and a communication interface, wherein the processor is configured to implement the steps of the method according to the first aspect, and the communication interface is configured to communicate with a network side device.

[0009] In a fifth aspect, a readable storage medium is provided, which stores a program or instructions, and the program or instructions are executed by a processor to implement the steps of the method according to the first aspect.

[0010] In a sixth aspect, a chip is provided, which comprises a processor and a communication interface, the communication interface and the processor are coupled, the processor is configured to run a program or instructions to implement the steps of the method according to the first aspect.

[0011] In a seventh aspect, a computer program / program product is provided, which 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 according to the first aspect.

[0012] In the embodiments of the present application, the sidelink communication on the unlicensed frequency band is supported. When the target feature state occurs during the sidelink communication on the first resource, the sidelink communication is switched to the second resource, wherein the first resource is the dedicated sidelink resource on the licensed frequency band scheduled by the network side device for the first terminal, and the second resource is the sidelink resource on the unlicensed frequency band or the resource in the sidelink resource pool on the licensed frequency band configured by the network side device for the first terminal; or the first resource is the sidelink resource on the unlicensed frequency band, and the second resource is the resource in the sidelink resource pool on the licensed frequency band configured by the network side device for the first terminal. Thus, when a special situation occurs during the sidelink communication on the first resource, the sidelink communication can be switched to the second resource, so as to ensure the continuity of the sidelink communication. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A schematic diagram of a wireless communication system to which the embodiments of the present application can be applied is shown.

[0014] Figure 2 A flowchart of a sidelink communication method provided by the embodiments of the present application is shown.

[0015] Figure 3 A structural schematic diagram of a sidelink communication device provided by the embodiments of the present application is shown.

[0016] Figure 4 A structural schematic diagram of a communication device provided by the embodiments of the present application is shown.

[0017] Figure 5 A hardware structural schematic diagram of a terminal provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0019] The terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects discussed in the specification and claims and do not necessarily indicate a specific order or sequence. It should be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the present application might operate in other sequences or orders than those described or otherwise illustrated herein. Furthermore, the terms "comprise", "include", "contain", and / or "have" should be understood to be open terms, i.e., to mean including but not limited to. The terms "and / or" and / or "and / or" in the description and in the claims of the present application are to be interpreted as open terms, i.e., indicating that the listed items are either to be used individually or in any combination. The terms "and / or" and / or "and / or" in the description and in the claims of the present application are to be interpreted as open terms, i.e., indicating that the listed items are either to be used individually or in any combination.

[0020] It is worth noting that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as 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 (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably in the embodiments of the present application, and the described techniques can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes a New Radio (NR) system for the purpose of example, and NR terminology is used in most of the following description, but these techniques can also be applied outside the NR system application, such as 6th Generation (6G) communication systems. th

[0021] Figure 1 ​A schematic diagram of a wireless communication system to which embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 can also be referred to as a terminal device or a user terminal (User Equipment, UE). The terminal 11 can be a terminal side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a Personal Digital Assistant (PDA), a palm computer, a netbook, an ultra-mobile personal computer (UMPC), a Mobile Internet Device (MID), a wearable device, or a vehicle-mounted device (VUE), a pedestrian terminal (PUE), etc. The wearable device includes a smart watch, a bracelet, a headset, glasses, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network side device 12 can be a base station or a core network. The base station can be referred to as a Node B, an evolved Node B, an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a Node B, an evolved Node B (eNB), a home Node B, a home evolved Node B, a WLAN access point, a WiFi node, a transmitting receiving point (TRP), or some other appropriate terminology in the art, as long as the same technical effects are achieved. The base station is not limited to a specific technical term, and it should be noted that only a base station in an NR system is taken as an example in the embodiments of the present application, but the specific type of the base station is not limited.

[0022] In the embodiments of the present application, the sidelink communication of the first terminal in the unlicensed frequency band refers to the sidelink communication of the first terminal in the New Radio in Unlicensed Spectrum (NR-U) working in the unlicensed spectrum.

[0023] In unlicensed band, Radio Resource Control (RRC) configures a consistent Listen Before Talk (LBT) failure recovery procedure for the Media Access Control (MAC) entity. If LBT detection is performed before transmission, and the channel is detected as busy, the lower layer sends an LBT failure indication to the MAC entity.

[0024] The consistent LBT failure is per UL BWP, and is generated based on the consistent LBT failure count of all uplink (UL) transmissions from the lower layer to the MAC entity. The parameter used by the UE for LBT failure count is LBT_COUNTER (per serving cell). RRC configures two parameters, i.e., lbt-FailureInstanceMaxCount and lbt-FailureDetectionTimer, for consistent LBT failure detection in lbt-FailureRecoveryConfig. LBT_COUNTER is incremented by one each time the MAC entity receives an LBT failure indication from the lower layer. When LBT_COUNTER >= lbt-FailureInstanceMaxCount, the consistent LBT failure is triggered for the active UL BWP of the serving cell, and then, the active UL BWP of the serving cell is switched to another UL BWP configured with a Physical Random Access Channel (PRACH) occasion on the same carrier of the serving cell, and the LBT is performed in the UL BWP which has not triggered the consistent LBT failure. If all UL BWPs of the serving cell have triggered the consistent LBT failure, the consistent LBT failure is indicated to the higher layer.

[0025] In a communication protocol, an eNB / gNB can initiate channel occupancy sharing according to nodeB's own downlink (DL) channel access or a UE according to UL channel access. An eNB / gNB / UE can determine a maximum COT through channel access priority class (CAPC) (as shown in Table 1). For channel access priority p = 3 and p = 4, if it can be ensured that no other radio access technology (RAT) shares this channel in the long term (as limited by the relevant protocol), T m cot，p = 10 ms; otherwise, T m cot，p = 8 ms.

[0026] Table 1 Channel access priority

[0027] p m p ]]> cw min，p ]]> cw max，p ]]> [CAT m cot，p ]]> allowedcw p sizes]]> 1 1 3 7 2 ms {3,7} 2 1 7 15 3 ms {7,15} 3 3 15 63 8 or 10 ms {15,31,63} 4 7 15 1023 8 or 10 ms {15,31,63,17,255,511,1023}

[0028] Some concepts and / or terms involved in the sidelink communication scheme provided by the embodiments of the present application are explained below.

[0029] The sidelink communication scheme provided by the embodiments of the present application is described in detail below in combination with the accompanying drawings, some embodiments and application scenarios.

[0030] Figure 2 A flowchart of a sidelink communication method in the embodiments of the present application is shown. The method 200 can be performed by a first terminal. In other words, the method can be performed by software or hardware installed on the first terminal. As shown in the figure, the method can include the following steps. Figure 2

[0031] S210, the first terminal performs sidelink communication on a first resource.

[0032] In the embodiments of the present application, the first terminal can support sidelink communication on an unlicensed frequency band.

[0033] S212, in the case of occurrence of a target special situation, the first terminal switches to a second resource to perform sidelink communication.

[0034] In an embodiment of the present application, the first resource can be a dedicated sidelink resource in a licensed frequency band scheduled by a network side device for the first terminal, and the second resource can be a sidelink resource in an unlicensed frequency band or the second resource can be a resource in a sidelink resource pool in a licensed frequency band configured by a network side device for the first terminal.

[0035] ​That is, in the process of the first terminal performing sidelink communication on the dedicated sidelink resource of the licensed frequency band scheduled by the network side device, in the case where the target special state occurs, the first terminal can switch to the sidelink resource of the unlicensed frequency band to perform sidelink communication, or the first terminal can also switch to the resource in the sidelink resource pool of the licensed frequency band configured by the network side device for the first terminal to perform sidelink communication.

[0036] In the above embodiments, the target state includes but is not limited to one of the following:

[0037] (1) Radio Resource Control (RRC) reestablishment;

[0038] (2) RRC reconfiguration;

[0039] (3) Cell switching.

[0040] In the above embodiments, in the case where the target state occurs, the first terminal can determine whether to switch to the sidelink resource of the unlicensed frequency band to perform sidelink communication or to switch to the resource in the sidelink resource pool configured by the network side device for the first terminal to perform sidelink communication according to whether the network side device configures the sidelink resource for the first terminal.

[0041] In one possible implementation, in the case where the first resource is the dedicated sidelink resource of the licensed frequency band scheduled by the network side device, and the network side device does not configure the sidelink resource pool for the first terminal, the first terminal switches to the sidelink resource of the unlicensed frequency band to perform sidelink communication. Through this possible implementation, in the case where the first terminal supports sidelink communication on the unlicensed frequency band, in the case where sidelink communication on the licensed frequency band occurs a special state, the first terminal can switch to the unlicensed frequency band to perform sidelink communication, so as to ensure the continuity of sidelink communication.

[0042] In one or more possible implementations, after the target special state occurs, the first terminal can wait for the recovery of the target special state, and after waiting for a period of time, if the target special state does not recover, the first terminal switches to the unlicensed frequency band to perform sidelink communication. Therefore, the first terminal starts a first timer when the target special state occurs; in the case where the first timer expires, the first terminal switches to the sidelink resource of the unlicensed frequency band to perform sidelink communication.

[0043] The first timer can be configured by the network side device, for example, the network side device pre-configures the first timer through signaling, for example, the network side device configures through system information block (SIB) broadcast, or the network side device configures through RRC dedicated signaling. Alternatively, the first timer can be defined by a protocol, for example, the protocol can pre-define one or more time lengths of the first timer, and the first terminal can select an optional value as the timing length of the first timer. In the case where the protocol pre-defines multiple time lengths, the first terminal can autonomously select one of them as the timing length of the first timer. For example, the first terminal can also determine whether to select a longer or shorter optional value from the multiple time lengths according to the priority of the current sidelink communication data transmission, which is not limited in the embodiments of the present application.

[0044] In one or more possible implementation manners, if the network side device does not configure the first timer and the protocol does not define the first timer, the first terminal can directly switch to the unlicensed frequency band sidelink communication when the target special situation occurs.

[0045] In the above possible implementation manner, the target special situation recovery can refer to RRC reestablishment completion, RRC reconfiguration completion, cell handover completion, etc.

[0046] In one or more possible implementation manners, the first terminal switching to the sidelink resource of the unlicensed frequency band for sidelink communication can include: the first terminal switching to the unlicensed frequency band, performing a listen before talk (LBT) operation on the sidelink resource of the unlicensed frequency band configured by the network side device, and using the acquired available resource for sidelink communication when available resources are acquired from the unlicensed frequency band. In this possible implementation manner, the first terminal can attempt to acquire available resources for sidelink communication through LBT, and use the acquired available resources for sidelink communication when available resources are acquired from the unlicensed frequency band.

[0047] In one or more possible implementations, the first terminal switching to the sidelink resource of the unlicensed frequency band for sidelink communication can also include: the first terminal performing LBT on the unlicensed frequency band, using the acquired available resource for sidelink communication in the case of acquiring available resource from the unlicensed frequency band, and switching to the first resource for sidelink communication again until the target special situation recovers. That is, in this possible implementation, the first terminal switches to the unlicensed frequency band to perform LBT after the target special situation occurs (directly or after waiting for the first timer to time out), attempts to acquire available resource for sidelink communication, uses the acquired available resource for sidelink communication in the case of acquiring available resource from the unlicensed frequency band, and detects whether the target special situation under the licensed frequency band recovers at the same time, and switches to the licensed frequency band if the target special situation recovers.

[0048] In one or more possible implementations, in order to avoid switching frequency, the first terminal switching to the sidelink resource of the unlicensed frequency band for sidelink communication includes: the first terminal starting a second timer, performing LBT on the unlicensed frequency band during the running of the second timer, using the acquired available resource for sidelink communication in the case of acquiring available resource from the unlicensed frequency band, and switching to the first resource for sidelink communication in the case of the second timer timing out and the target special situation recovering. That is, in this possible implementation, the first terminal starts a second timer after the target special situation occurs (directly or after waiting for the first timer to time out), switches to the unlicensed frequency band to perform LBT, attempts to acquire available resource for sidelink communication, uses the acquired available resource for sidelink communication in the case of acquiring available resource from the unlicensed frequency band, and detects whether the target special situation under the licensed frequency band recovers at the same time, and switches to the licensed frequency band if the target special situation recovers and the second timer times out.

[0049] Optionally, the second timer can be configured by the network side device, for example, the network side device pre-configures the second timer through signaling, for example, the network side device configures through system information block (SIB) broadcast, or the network side device configures through RRC dedicated signaling. Alternatively, it can also be specified by the protocol, for example, the protocol can pre-agree one or more time lengths of the second timer, and the first terminal can select an optional value as the timing length of the second timer. In the case where the protocol pre-agrees multiple time lengths, the first terminal can autonomously select one of them as the timing length of the second timer. For example, the first terminal predicts the 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 the multiple time lengths according to the recovery time, which is not limited in the embodiments of the present application.

[0050] In one or more possible implementation manners, if the network side device does not configure the second timer and the protocol does not specify the second timer, the first terminal can perform LBT operation on the sidelink resource of the unlicensed frequency band after switching to the unlicensed frequency band, try to obtain available resources for sidelink communication, and then switch to the resource of the licensed frequency band for sidelink communication after the target special situation is recovered.

[0051] In one or more possible implementation manners, in the case where the first resource is a dedicated sidelink resource of the licensed 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 can switch to the second resource for sidelink communication according to a preset priority rule, wherein the second resource is the resource with higher priority in the first candidate resource and the second candidate resource, the first candidate resource is the sidelink resource in the unlicensed frequency band, and the second candidate resource is the resource of the sidelink resource pool. That is, in the case where the first terminal supports sidelink communication on the unlicensed frequency band and the network side device configures the sidelink resource pool for the first terminal, the first terminal can select to switch to the resource with higher priority in the sidelink resource in the unlicensed frequency band and the resource of the sidelink resource pool.

[0052] In the embodiments of the present application, the preset priority rule can include one of the following:

[0053] (1) the priority of the first candidate resource is higher than the priority of the second candidate resource; for example, in the case where the network-side device only configures the terminal with at least one sidelink resource of an unlicensed frequency band, the terminal selects to switch the sidelink resource of the unlicensed frequency band. Or, in the case where the network-side device simultaneously configures the terminal with at least one sidelink resource of an unlicensed frequency band and at least one resource of a licensed frequency band (i.e., the sidelink resource pool), the terminal preferentially selects the sidelink resource of the unlicensed frequency band, i.e., the terminal is not allowed to jump to sidelink communication on the licensed frequency band.

[0054] (2) the priority of the second candidate resource is higher than the priority of the first candidate resource; for example, in the case where the network-side device only configures the terminal with at least one resource of a licensed frequency band (i.e., the sidelink resource pool), the terminal preferentially uses the resource of the licensed frequency band (i.e., the resource in the sidelink resource pool). Or, in the case where the network-side device simultaneously configures the first terminal with at least one sidelink resource of an unlicensed frequency band and at least one resource of a licensed frequency band, the terminal preferentially uses the resource of the licensed frequency band, i.e., the terminal is not allowed to jump to sidelink communication on the licensed frequency band.

[0055] Optionally, the priority of the first candidate resource being higher than the priority of the second candidate resource can include: in the case where the target air interface of the unlicensed frequency band and the sidelink resource of the unlicensed frequency band are shared, 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, when the network-side device and the terminal communicate through a New Radio in Unlicensed Spectrum (NR-U) frequency band of an unlicensed frequency spectrum, and the network-side device simultaneously configures the first terminal with at least one sidelink resource of an unlicensed frequency band and at least one resource of a licensed frequency band, if the target air interface of the unlicensed frequency band and the sidelink resource of the unlicensed frequency band are shared, for example, the network-side device preempts the unlicensed frequency band resource for the terminal, the terminal preferentially uses the sidelink resource of the unlicensed frequency band for sidelink communication. Of course, it is not limited to this, and in actual application, 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, which is not limited in the embodiments of the present application.

[0056] Optionally, the priority of the second candidate resource is higher than the priority of the first candidate resource comprises: in a case where the target air interface resource of the unlicensed frequency band and a sidelink resource of the unlicensed frequency band 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 frequency spectrum, and the network side device simultaneously 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, if the target air interface resource of the unlicensed frequency band and the sidelink resource of the unlicensed frequency band are not shared, for example, the network side device does not preempt the unlicensed frequency band resource for the terminal, the terminal preferentially uses the resource in the sidelink resource pool of the licensed frequency band for sidelink communication. Of course, this is not limited, and in actual application, the priority of the second candidate resource can be set to be higher than the priority of the first candidate resource in any case, which is not limited in the embodiments of the present application.

[0057] In another embodiment of the present application, the first resource can be a sidelink resource of an unlicensed frequency band, and the second resource can be a resource in a sidelink resource pool of a licensed frequency band configured by the network side device for the first terminal. That is to say, in the process of sidelink communication of the first terminal in the unlicensed frequency band, in the case of a target special situation, the first terminal can switch to the resource in the sidelink resource pool of the licensed frequency band configured by the network side device for the first terminal to perform sidelink communication. Through this possible implementation manner, in the case that the first terminal supports sidelink communication in the unlicensed frequency band, in the case that the sidelink communication in the unlicensed frequency band occurs a special situation, the sidelink communication in the licensed frequency band can be switched to ensure the continuity of the sidelink communication.

[0058] In one possible embodiment, in the case that the first resource is a sidelink resource of an unlicensed frequency band, the target special situation comprises one of the following:

[0059] (1) consistent LBT failure;

[0060] (2) COT-sharing failure; that is, the first terminal is a counterpart of sidelink communication, and the second terminal fails to preempt the unlicensed frequency band resource.

[0061] (3) consistent COT-sharing failure. That is, the first terminal is a counterpart of sidelink communication, and the second terminal continuously fails to preempt the unlicensed frequency band resource, that is, the number of consecutive failures exceeds a certain value.

[0062] In a possible implementation, in a case where the first resource is a sidelink resource of an unlicensed frequency band and the network-side device configures the first terminal with the sidelink resource pool, the first terminal switches to a resource in the sidelink resource pool for sidelink communication.

[0063] In a possible implementation, in a case where the target special situation includes continuous LBT failure, the first terminal switching to a resource in the sidelink resource pool for sidelink communication can include: the first terminal switching to a resource in the sidelink resource pool for sidelink communication and switching to a third resource for performing LBT, where the third resource has the same resource granularity as the first resource; and in a case where the third resource performs LBT and obtains a usable LBT result, stopping using the resource in the sidelink resource pool.

[0064] It should be noted that on an unlicensed frequency spectrum, a terminal can perform resource selection based on different resource selection granularities, for example, carrier-based resource selection, bandwidth part (BWP)-based resource selection, or resource pool-based resource selection. According to the terminal capability, the terminal can support SL transmission on one or more carriers on the unlicensed frequency spectrum. Further, one carrier can include one or more BWPs, and one BWP can include one or more resource pools.

[0065] In the above possible implementation, when the first terminal performs sidelink communication on the first resource, if continuous LBT failure occurs, the first terminal can switch to a resource in a sidelink resource pool configured by the network-side device for the first terminal for sidelink communication, and simultaneously switch to another unlicensed frequency band resource (i.e., the third resource) of the same granularity as the first resource for performing LBT operation. If a usable LBT result is obtained, the LBT result can be LBT success or LBT failure, and the use of the resource in the sidelink resource pool is stopped. That is, in a case where the network-side device configures the first terminal with the sidelink resource pool, the first terminal can temporarily use the resource in the sidelink resource pool.

[0066] In another possible implementation, to save the power consumption of the first terminal and avoid frequent execution of LBT operations, in a case where the target special condition includes continuous LBT failure, the switching of the first terminal to the resource in the sidelink resource pool for sidelink communication can include: the first terminal switches to the resource in the sidelink resource pool for sidelink communication, and starts a third timer; in a case where the third timer expires, the first terminal stops using the resource in the sidelink resource pool, and performs an LBT operation on the unlicensed frequency band.

[0067] Optionally, the third timer can be configured by the network side device, for example, the network side device pre-configures the third timer through signaling, for example, the network side device configures through system information block (SIB) broadcast, or the network side device configures through RRC dedicated signaling. Alternatively, it can also be specified by the protocol, for example, the protocol can pre-agree one or more time lengths of the third timer, and the first terminal can select an optional value from the time lengths as the timing length of the third timer. In a case where the protocol pre-agrees multiple time lengths, the first terminal can autonomously select one of them as the timing length of the third timer. For example, the first terminal can select an optional value from the multiple time lengths according to the current power, if the current power is sufficient (for example, the current power is greater than a preset threshold, such as 80%), a smaller optional value can be selected from the multiple time lengths, and if the current power is insufficient, a larger optional value can be selected from the multiple time lengths, which is not limited in the embodiments of the present application.

[0068] In one or more possible implementation, if the network side device does not configure the third timer and the protocol does not specify the third timer, the first terminal can switch to the resource of the sidelink resource pool configured by the network side device for the first terminal for sidelink communication, and at the same time, switch to another unlicensed frequency band resource (i.e., the third resource) of the same granularity as the first resource to perform an LBT operation. If an available LBT result is obtained, the LBT result can be LBT success or LBT failure, the use of the resource in the sidelink resource pool is stopped.

[0069] In a possible implementation, in a case where the first resource is a sidelink resource in an unlicensed frequency band and the network-side device configures the first terminal with the sidelink resource pool, if the target special situation includes COT sharing failure or persistent COT sharing failure, the first terminal switching to a resource in the sidelink resource pool for sidelink communication can include: the first terminal switching to a resource in the sidelink resource pool for sidelink communication, and pre-empting a sidelink resource for a second terminal on the unlicensed frequency band; in a case where the first terminal successfully pre-empts a sidelink resource for a second terminal on the unlicensed frequency band, stopping using the resource in the sidelink resource pool.

[0070] Alternatively, in another possible implementation, in order to save the power of the first terminal, in a case where the target special situation includes COT sharing failure or persistent COT sharing failure, the first terminal switching to a resource in the sidelink resource pool for sidelink communication can include: the first terminal switching to a resource in the sidelink resource pool for sidelink communication, and starting a fourth timer; in a case where the fourth timer expires, the first terminal stops using the resource in the sidelink resource pool, and performs LBT on the unlicensed frequency band to pre-empt a sidelink resource for a second terminal. That is, in a case where the first terminal performs COT sharing failure or persistent COT sharing failure, the first terminal can switch to a resource in the sidelink resource pool for sidelink communication (for example, notify a second terminal that it fails to pre-empt a resource on the unlicensed frequency band for it on the resource in the sidelink resource pool), while starting a fourth timer, in a case where the fourth timer expires, stop using the resource in the sidelink resource pool, and perform LBT on the unlicensed frequency band to pre-empt a sidelink resource for a second terminal.

[0071] Optionally, the fourth timer described above can be configured by the network side device, for example, the network side device pre-configures the fourth timer through signaling, for example, the network side device configures through system information block (System Information Block, SIB) broadcast, or the network side device configures through RRC dedicated signaling. Or, it can also be specified by the protocol, for example, the protocol can pre-agree one or more time lengths of the fourth timer, and the first terminal can select an optional value from them as the timing length of the fourth timer. Wherein, in the case that the protocol pre-agrees multiple time lengths, the first terminal can autonomously select one of them as the timing length of the fourth timer. For example, the first terminal can select an optional value from multiple time lengths according to the current power, if the current power is sufficient (for example, the current power is greater than a preset threshold, such as 80%), it can select a smaller optional value from multiple time lengths, if the current power is insufficient, it can select a larger optional value from multiple time lengths, which is not limited in the embodiments of the present application.

[0072] In one or more possible implementations, if the network side device does not configure the fourth timer and the protocol does not specify the fourth timer, the first terminal switches to the resources in the sidelink resource pool for sidelink communication, and preoccupies the sidelink resources for the second terminal on the unlicensed frequency band, and then stops using the resources in the sidelink resource pool in the case that the first terminal successfully preoccupies the sidelink resources for the second terminal on the unlicensed frequency band.

[0073] In an optional implementation of the embodiments of the present application, in the case that 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, the first terminal reports the target abnormal condition to the network side device. For example, in the case of continuous COT sharing failure, the first terminal can report consistent COT-sharing failure to the base station, and the base station instructs UE1 to enter the mode1 or mode2 mode of the SL frequency band for sidelink communication.

[0074] In the embodiments of the present application, the sidelink resource pool can include a normal resource pool and a special resource pool, wherein the resources in the normal resource pool are resources allowed to be used for sidelink transmission by the terminal in RRC idle state, inactive state, or connected state, and the special resource pool includes resources allowed to be used by the terminal in the target special condition of sidelink, that is, the special resource pool is a resource pool specially configured by the network side device for the target special condition, and the resources in the special resource pool are reserved by the network side device, and the terminal can use the resources in the special resource pool for sidelink communication in the target special condition.

[0075] In the above embodiments, if the sidelink resource pool is a normal resource pool in a licensed frequency band, when the first terminal uses the resources in the sidelink resource pool for sidelink communication, the first terminal can first apply to the network side device, and after obtaining the consent of the network side device, use the applied resources for communication. If the sidelink resource pool is a special resource pool in a licensed frequency band, the first terminal can randomly use a resource in the special resource pool for sidelink communication. Since the resources in the special resource pool can be simultaneously configured as special resource pools 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.

[0076] In the following, taking the sidelink resource pool as a special resource pool in a licensed frequency band as an example, the technical solutions provided in the embodiments of the present application are described.

[0077] In the following description, in order to distinguish, the target special situation occurring when the terminal works in a licensed frequency band is referred to as a traditional special situation, and the target special situation occurring when the terminal works in an unlicensed frequency band is referred to as a new type of special situation. The traditional special situation includes RRC reestablishment, RRC reconfiguration, cell handover, etc. The new type of special situation includes special situations in the SL-U scenario, such as consistent LBT failure, (consistent) COT-sharing failure, etc. If no prefix is specified, the special situation includes both the traditional special situation and the new type of special situation.

[0078] In the following embodiments, in order to distinguish, the SL frequency band refers to a licensed frequency band used for SL communication, and the SL-U frequency band refers to an unlicensed frequency band used for SL communication. The SL (frequency band) resource refers to a resource / candidate resource allocated by the network to the UE in a licensed frequency band, and the SL-U (frequency band) resource refers to a resource / candidate resource allocated by the network to the UE in an unlicensed frequency band. In addition, the special resource pool in the SL frequency band is also a kind of SL resource.

[0079] In the following embodiments, the special situation recovery can refer to RRC reestablishment completion, RRC reconfiguration completion, cell handover completion, etc. for the traditional special situation, and can refer to recovery from consistent LBT failure, (consistent) COT-sharing failure, i.e. LBT success, COT-sharing success, for the new type of special situation.

[0080] In one possible embodiment, when a UE working in a SL frequency band mode 1 resource allocation mode occurs a special situation, the UE can perform any one of the following (I) to (III).

[0081] (I) If the network only configures the UE with SL band special resource pool, the UE can use the special resource pool temporarily before the traditional special situation is recovered.

[0082] (II) If the network only configures the UE with SL-U band resource, the UE can perform any one of the following 1 to 3.

[0083] 1. If the network configures the UE with timer timer-1, the UE waits for the special situation to be recovered before the timer-1 expires; if the timer-1 expires, the UE switches to the SL-U band operation and performs LBT operation on the SL-U resource configured by the network to try to obtain available resources for SL-U communication. The timer-1 can be configured by SIB broadcast or by RRC dedicated signaling.

[0084] 2. If the UE is configured with a local timer timer-2, start the local timer timer-2, wherein the value range or value domain of the timer-2 is fixed, and the value range or value domain can be agreed by the protocol. Before the timer-2 expires, the UE waits for the special situation to be recovered, and if the timer-2 expires, the UE switches to the SL-U band operation and performs LBT operation on the SL-U resource configured by the network to try to obtain available resources for SL-U communication.

[0085] 3. If the network does not configure the UE with timer timer-1, and the UE is not configured with local timer timer-2, the UE directly switches to the SL-U band operation and performs LBT operation on the SL-U resource configured by the network to try to obtain available resources for SL-U communication.

[0086] (III) If the network configures the UE with both SL band special resource pool and SL-U band resource, the UE uses SL resource or SL-U resource according to the pre-set SL resource and SL-U resource priority rule.

[0087] The pre-set SL resource and SL-U resource priority rule can include at least one of the following:

[0088] Rule 1: When the network only allocates at least one SL-U resource to the UE, or allocates at least one SL and at least one SL-U resource to the UE, always use SL-U resource first, i.e. do not allow the UE to jump to SL band operation;

[0089] Rule 2: When the network only allocates at least one SL resource to the UE, or allocates at least one SL and at least one SL-U resource to the UE, always use SL resource first, i.e. do not allow the UE to jump to SL-U band operation.

[0090] Rule 3: When the network communicates with the UE through the NR-U frequency band, and the UE is simultaneously allocated SL and SL-U resources, if the NR-U frequency band resource and the SL-U resource are shared, the UE preferentially uses the SL-U resource for SL communication, otherwise, preferentially uses the SL resource for SL communication.

[0091] In another possible embodiment, the UE working in the SL frequency band mode 1 resource allocation mode occurs a special situation, if the SL-U resource is configured, the UE preferentially switches to the SL-U frequency band to work, and then recovers the SL frequency band mode 1 mode work based on some conditions. Specifically, the UE can perform the following processing:

[0092] (I) If the network only configures the UE with a special resource pool in the SL frequency band, the UE can use the special resource pool temporarily before the traditional special situation is recovered.

[0093] (II) If the network only configures the UE with SL-U frequency band resources, the UE can perform any one of the following 1 to 3 processing.

[0094] 1. The UE directly switches to the SL-U frequency band to work, performs LBT operation on the SL-U resource configured by the network, and tries to obtain available resources for SL-U communication until the UE recovers from the special situation.

[0095] 2. The UE switches to the SL-U frequency band to work, and starts a local timer timer-3. When the timer-3 expires, and the UE recovers from the special situation.

[0096] 3. If the network configures the UE with a timer timer-4, when the timer-4 expires, and the UE recovers from the special situation.

[0097] (III) If the network simultaneously configures the UE with a special resource pool in the SL frequency band and SL-U frequency band resources, the UE can preferentially use the SL resource or the SL-U resource according to the SL resource and SL-U resource priority rules described above.

[0098] The value of the timer-2 can be a fixed value, or a selected value in a list of fixed values. The timer-3 can be configured by SIB broadcast or by RRC dedicated signaling.

[0099] In yet another possible embodiment, the UE in the SL-U frequency band working occurs a special situation, which can be processed according to different special situations.

[0100] (I) When the UE occurs consistent LBT failure

[0101] In this case, if the network configures the UE with SL band special resource pool, the UE can use the SL band special resource pool temporarily, specifically, the UE can perform any of the following operations:

[0102] (1) If the UE obtains available LBT result after switching LBT resource at the same LBT resource granularity, the UE stops using the SL band special resource pool.

[0103] (2) If the network configures timer-5, when timer-5 expires, the UE stops using the SL band special resource pool and resumes the LBT operation on the SL-U band.

[0104] If the network does not configure the UE with SL band special resource pool, the UE reports consistent LBT failure to the base station, and the base station instructs the UE to enter the mode1 or mode2 mode of the SL band.

[0105] (2) When (consistent) COT-sharing failure occurs when UE1 preempts SL-U resources for UE2, the UE1 can perform the corresponding operation according to the following 1 or 2.

[0106] 1, If the network configures the UE1 with SL band special resource pool, the following operations can be performed:

[0107] (1) UE1 can use the SL band special resource pool temporarily. If UE1 recovers from (consistent) COT-sharing failure, UE1 stops using the SL band special resource pool.

[0108] (2) If the network configures timer-6, when timer-6 expires, UE1 stops using the SL band special resource pool and resumes the LBT operation on the SL-U band for UE2 to preempt SL-U resources.

[0109] 2, If the network does not configure the UE1 with SL band special resource pool, the UE1 reports consistent COT-sharing failure to the base station, and the base station instructs the UE1 to enter the mode1 or mode2 mode of the SL band.

[0110] Among them, the timer-4, timer-5 can be SIB broadcast configuration, also can be through RRC special signaling configuration.

[0111] It should be noted that the sidelink communication method provided in the embodiments of the present application can be executed by a sidelink communication device, or a control module in the sidelink communication device for executing the sidelink communication method. In the embodiments of the present application, the sidelink communication device is taken as an example to illustrate the sidelink communication device provided in the embodiments of the present application.

[0112] Figure 3 A structure schematic diagram of the sidelink communication device provided in the embodiments of the present application is shown, the device 300 can be applied to a first terminal, as shown, the device 300 mainly includes a first communication module 301 and a second communication module 302. Figure 3

[0113] In the embodiments of the present application, the first communication module 301 is configured to perform sidelink communication on a first resource, wherein the first terminal supports sidelink communication on an unlicensed frequency band; the second communication module 302 is configured to switch to a second resource to perform sidelink communication in the case that a target special situation occurs; wherein the first resource is a dedicated sidelink resource in a licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource in an unlicensed frequency band or the second resource is a resource in a sidelink resource pool in a licensed 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 is a resource in a sidelink resource pool in a licensed frequency band configured by the network side device for the first terminal.

[0114] In one possible implementation, the second communication module 302 switches to the second resource to perform sidelink communication, including:

[0115] In the case that the first resource is a dedicated sidelink resource in a licensed frequency band scheduled by a network side device, and the network side device does not configure the sidelink resource pool for the first terminal, the second communication module 302 switches to a sidelink resource in an unlicensed frequency band to perform sidelink communication.

[0116] In one possible implementation, the second communication module 302 switches to a sidelink resource in an unlicensed frequency band to perform sidelink communication, including:

[0117] When the target special situation occurs, a first timer is started.

[0118] In the case that the first timer is timed out, the second communication module 302 switches to a sidelink resource in an unlicensed frequency band to perform sidelink communication.

[0119] In one possible implementation, the first timer is configured by the network side device or the first timer is agreed by a protocol.

[0120] ​In a possible implementation, the second communication module 302 switching to the sidelink resource of the unlicensed frequency band to perform sidelink communication includes:

[0121] performing listen before talk (LBT) on the unlicensed frequency band, in a case where available resources are acquired from the unlicensed frequency band, performing sidelink communication using the acquired available resources, and switching to the first resource to perform sidelink communication again in a case where the target special situation is recovered.

[0122] In a possible implementation, the second communication module 302 switching to the sidelink resource of the unlicensed frequency band to perform sidelink communication includes:

[0123] starting a second timer, performing listen before talk (LBT) on the unlicensed frequency band during running of the second timer, in a case where available resources are acquired from the unlicensed frequency band, performing sidelink communication using the acquired available resources, and switching to the first resource to perform sidelink communication again in a case where the target special situation is recovered.

[0124]

[0125] In a possible implementation, the second timer is configured by the network side device or is agreed by a protocol.

[0126] In a possible implementation, the second communication module 302 switching to the second resource to perform sidelink communication includes:

[0127] in a case where the first resource is a dedicated sidelink resource in a licensed frequency band scheduled by the network side device and the network side device configures the first terminal with the sidelink resource pool, switching to the second resource to perform sidelink communication according to a preset priority rule, wherein the second resource is a resource with higher priority from among a first candidate resource and a second candidate resource, 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.

[0128] In a possible implementation, the preset priority rule includes one of the following:

[0129] the priority of the first candidate resource is higher than the priority of the second candidate resource;

[0130] the priority of the second candidate resource is higher than the priority of the first candidate resource.

[0131] ​In a possible implementation, the priority of the first candidate resource is higher than the priority of the second candidate resource, including: in a case where the target air interface resource of the unlicensed frequency band shares a sidelink resource of the unlicensed frequency band, the priority of the first candidate resource is higher than the priority of the second candidate resource, where the target air interface is an air interface for communication between the network side device and the terminal.

[0132] The priority of the second candidate resource is higher than the priority of the first candidate resource, including: in a case where the target air interface resource of the unlicensed frequency band does not share a sidelink resource of the unlicensed frequency band, the priority of the second candidate resource is higher than the priority of the first candidate resource.

[0133] In a possible implementation, the target abnormal situation includes one of the following:

[0134] RRC reestablishment;

[0135] RRC reconfiguration;

[0136] Cell switching.

[0137] In a possible implementation, in a case where the first resource is a sidelink resource of an unlicensed frequency band, the target special situation includes one of the following:

[0138] Continuous LBT failure;

[0139] COT sharing failure;

[0140] Continuous COT sharing failure.

[0141] In a possible implementation, the second communication module 302 switches to a second resource for sidelink communication, including:

[0142] In a case where 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 second communication module 302 switches to a resource in the sidelink resource pool for sidelink communication.

[0143] In a possible implementation, the second communication module 302 switches to a resource in the sidelink resource pool for sidelink communication, including:

[0144] In a case where the target special situation includes continuous LBT failure, the second communication module 302 switches to a resource in the sidelink resource pool for sidelink communication, and switches to a third resource for LBT, where the third resource has the same resource granularity as the first resource.

[0145] In a case where an LBT result available is obtained by performing LBT on the third resource, the use of the resources in the sidelink resource pool is stopped.

[0146] In one possible implementation, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, including:

[0147] In a case where the target special situation includes persistent LBT failure, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, and starts a third timer.

[0148] In a case where the third timer expires, the use of the resources in the sidelink resource pool is stopped, and LBT operation is performed on the unlicensed frequency band.

[0149] In one possible implementation, the third timer is configured by the network side device or is agreed by a protocol.

[0150] In one possible implementation, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, including:

[0151] In a case where the target special situation includes COT sharing failure or persistent COT sharing failure, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, and pre-empt sidelink resources for a second terminal on the unlicensed frequency band.

[0152] In a case where pre-empting sidelink resources for the second terminal on the unlicensed frequency band is successful, the use of the resources in the sidelink resource pool is stopped.

[0153] In one possible implementation, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, including:

[0154] In a case where the target special situation includes COT sharing failure or persistent COT sharing failure, the second communication module 302 switches to the resources in the sidelink resource pool for sidelink communication, and starts a fourth timer.

[0155] In a case where the fourth timer expires, the use of the resources in the sidelink resource pool is stopped, and LBT operation is performed on the unlicensed frequency band to pre-empt sidelink resources for a second terminal.

[0156] In one possible implementation, the fourth timer is configured by the network side device or is agreed by a protocol.

[0157] In one possible implementation, the second communication module 302 is further configured to:

[0158] In a case where 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, the target abnormal condition is reported to the network-side device.

[0159] The sidelink communication device in the embodiments of the present application can be a device, or a component, an integrated circuit, or a chip in a terminal. The device can be a mobile terminal, or a non-mobile terminal. Exemplarily, the mobile terminal can include, but is not limited to, the types of the terminal 11 listed above, and the non-mobile terminal can be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc., which are not limited in the embodiments of the present application.

[0160] The sidelink communication device in the embodiments of the present application can be a device with an operating system. The operating system can be an Android operating system, an ios operating system, or other possible operating systems, which are not limited in the embodiments of the present application.

[0161] The sidelink communication device provided by the embodiments of the present application can implement the method embodiments Figure 2 The method embodiments achieve the same technical effects, and thus details are not repeated here.

[0162] Optionally, as shown in Figure 4 The embodiments of the present application further provide a communication device 400, which includes a processor 401, a memory 402, and a program or instruction stored in the memory 402 and executable on the processor 401. For example, when the communication device 400 is a terminal, the program or instruction is executed by the processor 401 to implement the various processes of the sidelink communication method embodiments described above, and achieve the same technical effects. Details are not repeated here.

[0163] The embodiments of the present application further provide a terminal, which includes a processor and a communication interface. The processor is configured to implement the various processes of the sidelink communication method embodiments described above, and the communication interface is configured to communicate with an external communication device. The terminal embodiment corresponds to the terminal-side method embodiment described above. The various implementation processes and implementation manners of the method embodiments described above can be applied to the terminal embodiment, and achieve the same technical effects. Specifically, Figure 5 A hardware structure diagram of a terminal for implementing the embodiments of the present application.

[0164] The terminal 500 includes, but is 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.

[0165] Those skilled in the art can understand that the terminal 500 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 510 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. Figure 5 The terminal structure shown in the figure is not a limitation on the terminal, and the terminal can include more or fewer components than the figure, or combine certain components, or different component arrangements, which are not described here.

[0166] It should be understood that in the embodiments of the present application, the input unit 504 can include a graphics processor (GPU) 5041 and a microphone 5042. The graphics processor 5041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 506 can include a display panel 5061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. 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 can include two parts of a touch detection device and a touch controller. The other input devices 5072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, etc., which are not described here.

[0167] In the embodiments of the present application, the radio frequency unit 501 receives downlink data from a network side device and processes the data by the processor 510; in addition, the radio frequency unit 501 sends 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, etc.

[0168] The memory 509 can be used to store software programs or instructions and various data. The memory 509 can mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area can store an operating system, an application program or instruction required by at least one function (such as a sound playing function, an image playing function, etc.), etc. In addition, the memory 509 can include a high-speed random access memory, and can also include a non-transitory memory, which can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. For example, at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device.

[0169] The processor 510 can include one or more processing units; optionally, the processor 510 can integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and an application program or instruction, etc., and the modem processor mainly processes wireless communication, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 510.

[0170] The radio frequency unit 501 is configured to perform sidelink communication on a first resource, wherein the terminal supports performing sidelink communication on an unlicensed frequency band; and in the case that a target special situation occurs, the first terminal switches to a second resource to perform sidelink communication.

[0171] The first resource is a dedicated sidelink resource in a licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource in an unlicensed frequency band or the second resource is a resource in a sidelink resource pool in a licensed 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 is a resource in a sidelink resource pool in a licensed frequency band configured by the network side device for the first terminal.

[0172] In the embodiments of the present application, the first terminal supporting sidelink communication in the unlicensed frequency band switches to the second resource for sidelink communication when the target feature state occurs during sidelink communication in the first resource, wherein the first resource is a dedicated sidelink resource in the licensed frequency band scheduled by the network side device for the first terminal, and the second resource is a sidelink resource in the unlicensed frequency band or the second resource is a resource in the sidelink resource pool in the licensed frequency band configured by the network side device for the first terminal; or the first resource is a sidelink resource in the unlicensed frequency band, and the second resource is a resource in the sidelink resource pool in the licensed frequency band configured by the network side device for the first terminal. Thus, a processing scheme for a terminal supporting sidelink communication in the unlicensed frequency band in the case of a special state is given.

[0173] The embodiments of the present application also provide a readable storage medium, which stores a program or instructions, and the program or instructions are executed by a processor to implement various processes of the sidelink communication method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0174] The processor is the processor in the terminal in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, etc.

[0175] The embodiments of the present application further provide a chip, which includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to run a program or instructions to implement various processes of the sidelink communication method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0176] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0177] The embodiments of the present application also provide a computer program / program product stored in a non-transitory storage medium, which is executed by at least one processor to implement various processes of the sidelink communication method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0178] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by more than one process, method, article, or apparatus either simultaneously, concurrently, or with intervening action that are carried out at the same time, in any order, or in an overlapping manner. For example, the described method can be performed in a different order or simultaneously, and the various steps can be combined or omitted, or additional steps can be added, without departing from the scope of the described method. Also, features described with respect to certain examples can be combined in other examples.

[0179] From the above description of the embodiments, it is apparent that the method of the above-described embodiments can be realized by means of software and general-purpose hardware platforms. Of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such an understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a number of instructions to make a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in various embodiments of the present application.

[0180] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-described specific embodiments, which are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

Claims

1. A side-link communication method, characterized in that, include: The first terminal performs side-link communication in the first resource; In the event of a special situation at the target, the first terminal switches to the second resource for side-link communication; Wherein, the first resource is a dedicated side link resource under the licensed frequency band scheduled by the network-side device for the first terminal, and the second resource is a side link resource under the unlicensed frequency band or a resource in the side link resource pool under the licensed frequency band configured by the network-side device for the first terminal; or, the first resource is a side link resource under the unlicensed frequency band, and the second resource is a resource in the side link resource pool under the licensed frequency band configured by the network-side device for the first terminal. Wherein, the first terminal switches to the second resource for side-link communication, including: If the first resource is a dedicated sidelink resource in a 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 switches to a sidelink resource in an unlicensed frequency band for sidelink communication; or... When the first resource is a dedicated side link resource in a licensed frequency band scheduled by the network-side device, and the network-side device configures the side link resource pool for the first terminal, the first terminal switches to the second resource for side link communication according to a preset priority rule. The second resource is the resource with higher priority between the first alternative resource and the second alternative resource. The first alternative resource is the side link resource in the unlicensed frequency band, and the second alternative resource is the resource in the side link resource pool.

2. The method according to claim 1, characterized in that, The first terminal switches to the sidelink resources of the unlicensed frequency band for sidelink communication, including: When the target special condition occurs, the first terminal starts the first timer; If the first timer times out, the first terminal switches to a sidelink resource in an unlicensed frequency band for sidelink communication.

3. The method according to claim 2, characterized in that, The first timer is configured by the network-side device or is agreed upon by the protocol.

4. The method according to any one of claims 1 to 3, characterized in that, The first terminal switches to unlicensed frequency band sidelink resources for sidelink communication, including: The first terminal performs Listen-Before-Speak (LBT) on the unlicensed frequency band. If available resources are obtained from the unlicensed frequency band, the terminal uses the obtained available resources for sidelink communication until the target special condition is restored, and then switches to the first resource for sidelink communication.

5. The method according to any one of claims 1 to 3, characterized in that, The first terminal switches to unlicensed frequency band sidelink resources for sidelink communication, including: The first terminal starts a second timer. During the operation of the second timer, it performs Listen-Before-Speak (LBT) on the unlicensed frequency band. If available resources are obtained from the unlicensed frequency band, the obtained available resources are used for side link communication. If the second timer times out and the target special condition is restored, the first terminal switches to the first resource for side link communication.

6. The method according to claim 1, characterized in that, The preset priority rule includes one of the following: The first alternative resource has a higher priority than the second alternative resource. The priority of the second alternative resource is higher than that of the first alternative resource.

7. The method according to claim 6, characterized in that, The priority of the first alternative resource is higher than that of the second alternative resource, including: when the target air interface resource of the unlicensed frequency band is shared with the side link resource of the unlicensed frequency band, the priority of the first alternative resource is higher than that of the second alternative resource, wherein the target air interface is the air interface for communication between the network-side device and the terminal. The priority of the second alternative resource is higher than that of the first alternative resource, including: when the target air interface resource in the unlicensed frequency band is not shared with the side link resource in the unlicensed frequency band, the priority of the second alternative resource is higher than that of the first alternative resource.

8. The method according to any one of claims 1 to 7, characterized in that, The target special condition includes one of the following: Radio Resource Control (RRC) Reconstruction; RRC reconfiguration; Cell handover.

9. The method according to claim 1, characterized in that, When the first resource is a sidelink resource in an unlicensed frequency band, the target special condition includes one of the following: Continuous LBT failure; Channel occupancy time COT sharing failed; Continuous COT sharing failed.

10. The method according to claim 9, characterized in that, The first terminal switches to the second resource for sidelink communication, including: If the first resource is a side link resource in an unlicensed frequency band, and the network-side device configures the side link resource pool for the first terminal, the first terminal switches to the resources in the side link resource pool for side link communication.

11. The method according to claim 10, characterized in that, The first terminal switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a persistent LBT failure, the first terminal switches to a resource in the sidelink resource pool for sidelink communication and switches to a third resource to perform LBT, wherein the third resource has the same resource granularity as the first resource. If the LBT performed by the third resource yields a usable LBT result, the resources in the sidelink resource pool are no longer used.

12. The method according to claim 10, characterized in that, The first terminal switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a persistent LBT failure, the first terminal switches to resources in the sidelink resource pool for sidelink communication and starts a third timer. If the third timer times out, the first terminal stops using the resources in the sidelink resource pool and performs LBT on the unlicensed frequency band.

13. The method according to claim 10, characterized in that, The first terminal switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a special situation including COT sharing failure or continuous COT sharing failure, the first terminal switches to the resources in the side link resource pool for side link communication and preempts side link resources for the second terminal on the unlicensed frequency band. If the first terminal successfully preempts the sidelink resources for the second terminal on the unlicensed frequency band, the use of resources in the sidelink resource pool shall cease.

14. The method according to claim 10, characterized in that, The first terminal switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a special condition including COT sharing failure or persistent COT sharing failure, the first terminal switches to resources in the sidelink resource pool for sidelink communication and starts a fourth timer. If the fourth timer expires, the first terminal stops using the resources in the sidelink resource pool and performs LBT operation on the unlicensed frequency band to allow the second terminal to preempt the sidelink resources.

15. The method according to claim 9, characterized in that, The method further includes: If the first resource is a side link resource in an unlicensed frequency band, and the network-side device has not configured the side link resource pool for the first terminal, the first terminal reports the target special condition to the network-side device.

16. The method according to any one of claims 1 to 15, characterized in that, The sidelink resource pool includes a general resource pool and a special resource pool. The general resource pool includes resources that the terminal is allowed to use for sidelink transmission in the Radio Resource Control (RRC) idle state, inactive state, or connected state, which are different from the main frequency. The sidelink special resource pool includes resources that the terminal is allowed to use when the target special condition occurs in the sidelink.

17. A side-link communication device, applied to a first terminal, characterized in that, The device includes: The first communication module is used for side-link communication in the first resource; The second communication module is used to switch to the second resource for side-link communication in the event of a special situation of the target. Wherein, the first resource is a dedicated side link resource under the licensed frequency band scheduled by the network-side device for the first terminal, and the second resource is a side link resource under the unlicensed frequency band or a resource in the side link resource pool under the licensed frequency band configured by the network-side device for the first terminal; or, the first resource is a side link resource under the unlicensed frequency band, and the second resource is a resource in the side link resource pool under the licensed frequency band configured by the network-side device for the first terminal. The second communication module switches to the second resource for side-link communication, including: If the first resource is a dedicated sidelink resource in a 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, then switch to a sidelink resource in an unlicensed frequency band for sidelink communication; or... When the first resource is a dedicated side link resource in the licensed frequency band scheduled by the network-side device, and the network-side device configures the side link resource pool for the first terminal, the system switches to the second resource for side link communication according to a preset priority rule. The second resource is the resource with higher priority among the first and second alternative resources. The first alternative resource is the side link resource in the unlicensed frequency band, and the second alternative resource is the resource in the side link resource pool.

18. The apparatus according to claim 17, characterized in that, The second communication module switches to unlicensed frequency band sidelink resources for sidelink communication, including: When the aforementioned special condition occurs, the first timer is activated; If the first timer times out, switch to the sidelink resources of the unlicensed frequency band for sidelink communication.

19. The apparatus according to claim 17 or 18, characterized in that, The second communication module switches to unlicensed frequency band sidelink resources for sidelink communication, including: The Listen-Before-Speak (LBT) is performed on the unlicensed frequency band. If available resources are obtained from the unlicensed frequency band, the obtained available resources are used for sidelink communication until the target special condition is restored, and then the communication is switched to the first resource for sidelink communication.

20. The apparatus according to claim 17 or 18, characterized in that, The second communication module switches to unlicensed frequency band sidelink resources for sidelink communication, including: A second timer is started, and during the operation of the second timer, a listen-before-speak (LBT) is performed on the unlicensed frequency band. If available resources are obtained from the unlicensed frequency band, the obtained available resources are used for sidelink communication. If the second timer times out and the target special condition is restored, switch to the first resource for side link communication.

21. The apparatus according to claim 17, characterized in that, The second communication module switches to the second resource for sidelink communication, including: If the first resource is a side link resource in an unlicensed frequency band, and the network-side device configures the side link resource pool for the first terminal, then switch to the resources in the side link resource pool for side link communication.

22. The apparatus according to claim 21, characterized in that, The second communication module switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a persistent LBT failure, the system switches to a resource in the sidelink resource pool for sidelink communication and switches to a third resource to perform LBT, wherein the third resource has the same resource granularity as the first resource. If the LBT performed by the third resource yields a usable LBT result, the resources in the sidelink resource pool are no longer used.

23. The apparatus according to claim 21, characterized in that, The second communication module switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a persistent LBT failure, the system switches to resources in the sidelink resource pool for sidelink communication and starts a third timer. If the third timer times out, the resources in the sidelink resource pool are stopped from being used, and LBT is performed on the unlicensed frequency band.

24. The apparatus according to claim 21, characterized in that, The second communication module switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a special situation including COT sharing failure or persistent COT sharing failure, the system switches to the resources in the side link resource pool for side link communication and preempts side link resources for the second terminal on the unlicensed frequency band. If the second terminal successfully preempts the sidelink resources on the unlicensed frequency band, the use of resources in the sidelink resource pool shall be stopped.

25. The apparatus according to claim 21, characterized in that, The second communication module switches to resources in the sidelink resource pool for sidelink communication, including: In the event of a special condition including COT sharing failure or persistent COT sharing failure, the system switches to resources in the sidelink resource pool for sidelink communication and starts a fourth timer. If the fourth timer times out, the use of resources in the sidelink resource pool is stopped, and LBT operation is performed on the unlicensed frequency band to allow the second terminal to preempt sidelink resources.

26. The apparatus according to claim 21, characterized in that, The second communication module is also used for: If the first resource is a side link resource in an unlicensed frequency band, and the network-side device has not configured the side link resource pool for the first terminal, the target abnormal condition is reported to the network-side device.

27. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the sidelink communication method as described in any one of claims 1 to 16.

28. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the side-link communication method as described in any one of claims 1 to 16.

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