CN116156577A

CN116156577A - Side link communication method, side link communication device and terminal

Info

Publication number: CN116156577A
Application number: CN202111357030.4A
Authority: CN
Inventors: 黎建辉; 鲍炜; 郑倩
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2023-05-23
Also published as: WO2023088223A1

Abstract

The application discloses a side link communication method, a side link communication device and a side link communication terminal, which belong to the technical field of wireless communication, and the side link communication method in the embodiment of the application comprises the following steps: the first terminal performs side link communication on a first resource; under the condition of the occurrence of a target special condition, the first terminal is switched to a second resource to carry out side link communication; the first resource is a dedicated side link resource under an authorized frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource under an unauthorized frequency band or a side link resource pool under an authorized frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal.

Description

Side link communication method, side link communication device and terminal

Technical Field

The application belongs to the technical field of wireless communication, and particularly relates to a side link communication method, a side link communication device and a side link communication terminal.

Background

In side link (sidlink) communication, there are two resource selection manners for a terminal, one is that a base station schedules resources, i.e., mode (mode) 1, and the other is that the terminal autonomously selects resources, i.e., mode 2.

However, special conditions (Exceptional Cases) may occur during the sidelink communication by the terminal, for example, the procedure of the sidelink communication by the terminal in a connected state on the resources scheduled by the base station performs a radio resource control (Radio Resource Control, RRC) connection reestablishment procedure, in which case, how to guarantee the succession of the sidelink communication has not yet been given an effective solution.

Disclosure of Invention

The embodiment of the application provides a side link communication method, a side link communication device and a side link communication terminal, which can solve the problem that the continuity of side link communication cannot be ensured when special conditions occur in the side link communication process.

In a first aspect, a method of sidelink communication is provided, comprising: the method comprises the steps that a first terminal performs side link communication on a first resource, wherein the first terminal supports side link communication on an unlicensed frequency band; under the condition of the occurrence of a target special condition, the first terminal is switched to a second resource to carry out side link communication; the first resource is a dedicated side link resource under an authorized frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource under an unauthorized frequency band or a side link resource pool under an authorized frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal.

In a second aspect, there is provided a sidelink communication apparatus for use with a first terminal, the apparatus comprising: the first communication module is used for carrying out side link communication on a first resource, wherein the first terminal supports side link communication on an unlicensed frequency band; the second communication module is used for switching to a second resource to carry out side link communication under the condition of occurrence of a target special condition; the first resource is a dedicated side link resource under an authorized frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource under an unauthorized frequency band or a side link resource pool under an authorized frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal.

In a third aspect, there is provided a terminal comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, the program or instruction when executed by the processor implementing the steps of the method according to the first aspect.

In a fourth aspect, a terminal is provided, which includes a processor and a communication interface, where the processor is configured to implement the steps of the method as described in the first aspect, and the communication interface is configured to communicate with a network-side device.

In a fifth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor realizes the steps of the method according to the first aspect.

In a sixth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor for running a program or instructions implementing the steps of the method according to the first aspect.

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

In the embodiment of the application, when the side link communication is carried out on the first resource and the side link communication is carried out on the unlicensed frequency band, under the condition that the target characteristic state occurs, the side link communication is carried out on the second resource, wherein the first resource is a dedicated side link resource under the licensed frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource of the unlicensed frequency band or a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal. Therefore, when special conditions occur in the process of conducting the side link communication on the first resource, the side link communication can be switched to the second resource to conduct the side link communication, so that the continuity of the side link communication is ensured.

Drawings

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable;

fig. 2 is a schematic flow chart of a sidelink communication method according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a sidelink communication device according to an embodiment of the present application;

fig. 4 shows a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 5 shows a schematic hardware structure of a terminal according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. 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 otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (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 embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a new air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may also be called a terminal Device or a User Equipment (UE), and the terminal 11 may be a terminal-side Device such as a mobile phone, a tablet Computer (Tablet Personal Computer), a Laptop (Laptop Computer) or a notebook (Personal Digital Assistant, PDA), a palm Computer, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet Device (Mobile Internet Device, MID), a Wearable Device (or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and the Wearable Device includes: smart watches, bracelets, headphones, eyeglasses, etc. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may be a base station or a core network, wherein the 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 set (Basic Service Set, BSS), an extended service set (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 transmission and reception point (TransmittingReceivingPoint, TRP), or some other suitable terminology in the field, and the base station is not limited to a specific technical vocabulary so long as the same technical effect is achieved, and it should be noted that, in the embodiment of the present 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 the embodiment of the application, the first terminal performs the sidelink communication in the unlicensed frequency band, that is, the first terminal operates in a new air interface (New Radio in Unlicensed Spectrum, NR-U) of the unlicensed frequency spectrum to perform the sidelink communication.

In the unlicensed 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) for the medium access control (Media Access Control, MAC) entity, and if LBT detection is performed prior to transmission and a busy channel is detected, the lower layer sends an LBT failure indication (LBT failure indication) to the MAC entity.

Persistent LBT failures are generated on a per BWP (for per UL BWP) basis by persistent LBT failure counts for all Uplink (UL) transmissions from the lower layer to the MAC entity. The parameter for the UE for LBT failure count is lbt_counter (per serving cell (forper Serving Cell)). The RRC configures two parameters for persistent LBT failure detection (consistent LBT failure detection) at LBT-FailureRecoveryConfig, namely LBT-FailureInstanceMaxCount and LBT-FailureDetectionTimer. The lbt_counter count is incremented by one each time the MAC entity receives a lower layer LBT failure indication. When lbt_counter > = LBT-failureimstancemaxcount, an active uplink bandwidth portion (active UL BWP) of the serving cell is triggered consistent LBT failure, and then a switch is made from this active UL BWP to another UL BWP configured with a physical random access channel (Physical Random Access Channel, PRACH) on the same carrier of the serving cell, and no UL BWP of consistent LBT failure is yet triggered, where LBT continues to be performed. If all UL BWPs of the serving cell trigger consistent LBT failure, consistent LBT failure is indicated to the higher layer.

In the communication protocol, the eNB/gNB may initiate channel occupancy sharing according to nodeB own Downlink (DL) channel access, or the UE may initiate channel occupancy sharing according to UL channel access (channel occupancy sharing). The eNB/gNB/UE may determine a maximum COT through the channel access priority (Channel Access Priority Class, cap) (as shown in table 1). For channel access priorities p=3 and p=4, T is the case if it is guaranteed in the long term that no other radio access technologies (Radio Access Technology, RAT) share the channel (e.g. related protocol restrictions) _{m cot，p} =10 ms; otherwise, T _{m cot，p} ＝8ms。

Table 1 channel access priority

p	m _p	cw _min，p	cw _max，p	T _{m cot，p}	allowedcw _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 scheme provided in the embodiments of the present application are explained below.

The following describes in detail the sidelink communication scheme provided in the embodiments of the present application through some embodiments and application scenarios thereof with reference to the accompanying drawings.

Fig. 2 shows a schematic flow chart of a method of sidelink communication in an embodiment of the present application, and the method 200 may be performed by a first terminal. In other words, the method may be performed 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 side link communication on the first resource.

In the embodiment of the application, the first terminal can support the side link communication on the unlicensed frequency band.

S212, when the target special condition occurs, the first terminal is switched to the second resource to carry out side link communication.

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

That is, in the process that the first terminal performs the sidelink communication on the dedicated sidelink resource of the authorized frequency band scheduled by the network side device, the first terminal may switch to the sidelink resource of the unlicensed frequency band to perform the sidelink communication in the case that the target special state occurs, or the first terminal may switch to the resource in the sidelink resource pool in the authorized frequency band configured by the network side device for the first terminal to perform the sidelink communication.

In the above embodiment, the target condition includes, but is not limited to, one of:

(1) Radio resource control (Radio Resource Control, RRC) reestablishment;

(2) RRC reconfiguration;

(3) Cell switching.

In the above embodiment, in the case of occurrence of the target condition, the first terminal may determine whether to switch to the sidelink communication on the sidelink resource of the unlicensed band or to switch to the sidelink communication on the resource in the sidelink resource pool configured by the network side device for the first terminal according to whether the sidelink resource is configured by the network side device for the first terminal.

In one possible implementation manner, in a case that the first resource is a dedicated sidelink resource in an 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, the first terminal switches to a sidelink resource in an unlicensed frequency band to perform sidelink communication. By the possible implementation manner, when the first terminal supports the side link communication on the unlicensed frequency band, the first terminal can switch to the unlicensed frequency band to perform the side link communication under the condition that special conditions occur in the case that the side link communication is performed on the licensed frequency band, so that the continuity of the side link communication is ensured.

In one or more possible implementations, the first terminal may wait for the target special condition to recover after the target special condition occurs, and after waiting for a period of time, if the target special condition does not recover, switch to the unlicensed frequency band for the sidelink communication. Thus, the first terminal starts a first timer when the target special condition occurs; and under the condition that the first timer is overtime, the first terminal is switched to the side link resource of the unlicensed frequency band to perform side link communication.

The first timer may be configured by the network side device, for example, the network side device configures the first timer in advance through signaling, for example, the network side device broadcasts the configuration through a system information block (System Information Block, SIB), or the network side device configures the first timer through RRC dedicated signaling. Alternatively, it may be defined by a protocol, for example, the protocol may agree in advance on one or more lengths of the first timer, from which the first terminal may select a selectable value as the length of the first timer. Under the condition that the protocol pre-agrees with a plurality of time durations, the first terminal can autonomously select one of the time durations as the timing time duration of the first timer. For example, the first terminal may also determine, according to the priority of the data transmission of the current sidelink communication, whether to select a longer or shorter alternative value from a plurality of durations, which is not limited in the embodiments of the present application.

In one or more possible implementations, if the network side device does not configure the first timer and the protocol does not specify the first timer, the first terminal may directly switch to unlicensed band sidelink communication in the case that the target special condition occurs.

In the above possible implementation manners, the target special condition recovery may refer to RRC reestablishment completion, RRC reconfiguration completion, cell handover completion, and the like.

In one or more possible implementations, the switching of the first terminal to the sidelink resource of the unlicensed band for sidelink communication may include: the first terminal is switched to an unlicensed frequency band, a listen before talk (Listen Before Talk, LBT) operation is performed on a side link resource of the unlicensed frequency band configured by the network side device, and when an available resource is acquired from the unlicensed frequency band, the acquired available resource is used for side link communication. In this possible implementation manner, the first terminal may attempt to acquire available resources through LBT to perform sidelink communication, and in case of acquiring available resources from the unlicensed frequency band, perform sidelink communication using the acquired available resources.

In one or more possible implementations, the switching of the first terminal to the sidelink resource of the unlicensed band for sidelink communication may also include: and the first terminal is switched to an unlicensed frequency band to execute LBT, and under the condition that available resources are acquired from the unlicensed frequency band, the acquired available resources are used for carrying out side-link communication until the target special condition is recovered, and then the first terminal is switched to the first resources to carry out side-link communication. That is, in this possible implementation manner, the first terminal performs LBT by switching to an unlicensed band after the occurrence of the target special condition (directly or after waiting for the first timer to timeout), tries to acquire available resource by-link communication, performs by-link communication using the acquired available resource in the case of acquiring the available resource from the unlicensed band, and simultaneously detects whether the target special condition in an licensed band is restored, and if the target special condition is restored, switches to an licensed band.

In one or more possible implementations, to avoid switching frequencies, the switching, by the first terminal, to a sidelink resource of an unlicensed frequency band for sidelink communication includes: the first terminal starts a second timer, LBT is executed on the unlicensed frequency band during the operation of the second timer, and the obtained available resources are used for side-link communication under the condition that the available resources are obtained from the unlicensed frequency band; and under the condition that the second timer is overtime and the target special condition is recovered, the first terminal is switched to the first resource for side link communication. That is, in this possible implementation, the first terminal starts the second timer after the occurrence of the target special condition (directly or after waiting for the first timer to timeout), and switches to the unlicensed band to perform LBT, tries to acquire the available resource by-link communication, and in the case of acquiring the available resource from the unlicensed band, performs by-link communication using the acquired available resource, and simultaneously detects whether the target special condition in the licensed band is restored, and if the target special condition is restored and the second timer is timeout, switches to the licensed band.

Alternatively, the above second timer may be configured by the network side device, for example, the network side device configures the second timer in advance through signaling, for example, the network side device configures through a system information block (System Information Block, SIB) broadcast, or the network side device configures through RRC dedicated signaling. Alternatively, it may be defined by a protocol, for example, the protocol may pre-agree on one or more durations of the second timer, from which the first terminal may select a selectable value as the timing duration of the second timer. Under the condition that the protocol pre-agrees with a plurality of time durations, the first terminal can autonomously select one of the time durations as the timing time duration of the second timer. For example, the first terminal predicts the recovery time of the current target special condition according to the occurred target special condition, and selects an optional value similar to the recovery time from a plurality of durations according to the recovery time.

In one or more possible implementations, if the network side device does not configure the second timer and the protocol does not specify the second timer, the first terminal may perform an LBT operation on a sidelink resource of the unlicensed band after switching to the unlicensed band, attempt to acquire an available resource for sidelink communication until the target special condition is recovered, and then switch to a resource uplink communication of the licensed band.

In one or more possible implementation manners, in a case where the first resource is a dedicated sidelink resource in an 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 may switch to the second resource to perform sidelink communication according to a preset priority rule, where the second resource is a resource with a higher priority among a first alternative resource and a second alternative resource, the first alternative resource is a sidelink resource in the unlicensed frequency band, and the second alternative resource is a resource of the sidelink resource pool. That is, in the case where the first terminal supports the sidelink communication on the unlicensed band and the network side device configures the sidelink resource pool for the first terminal, the first terminal may select to switch to a resource with a higher priority among the sidelink resources in the unlicensed band and the resources in the sidelink resource pool.

In an embodiment of the present application, the preset priority rule may include one of the following:

(1) The priority of the first alternative resource is higher than the priority of the second alternative resource; for example, in the case that the network side device configures only the side link resources of at least one unlicensed band for the terminal, the terminal selects to switch the side link resources of the unlicensed band. Or, in the case that the network side equipment configures at least one unlicensed band side link resource and at least one licensed band side link resource (i.e. the side link resource pool) for the terminal at the same time, the terminal preferentially selects the unlicensed band side link resource, i.e. does not allow the terminal to jump to licensed band uplink side link communication.

(2) The second alternative resource has a higher priority than the first alternative resource; for example, in the case that the network side device configures only the resources of at least one licensed band (i.e., the sidelink resource pool) for the terminal, the terminal preferentially uses the resources of the licensed band (i.e., the resources in the sidelink resource pool). Or under the condition that the network side equipment configures at least one unlicensed side link resource and at least one licensed side link resource for the first terminal, the terminal preferentially uses the licensed side link resource, i.e. does not allow the terminal to jump to licensed side link communication.

Optionally, the priority of the first alternative resource is higher than the priority of the second alternative resource may include: and under the condition that 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 an air interface for communication between network side equipment and a terminal. That is, when the network side device communicates with the terminal through a new air interface (New Radio in Unlicensed Spectrum, NR-U) band of the unlicensed spectrum and the network side device configures at least one side link resource of the unlicensed band and at least one resource of the licensed band for the first terminal at the same time, if the target air interface resource of the unlicensed band is shared with the side link resource of the unlicensed band, for example, the network side device preemptively uses the side link resource of the unlicensed band for the terminal to perform side link communication. Of course, the method is not limited thereto, and in practical application, the priority of the first alternative resource may be higher than the priority of the second alternative resource in any case, which is not limited in the embodiment of the present application.

Optionally, the priority of the second alternative resource is higher than the priority of the first alternative resource includes: and under the condition that the target air interface resource of the unlicensed frequency band is not shared with the side link resource of the unlicensed frequency band, the priority of the second alternative resource is higher than that of the first alternative resource. That is, when the network side device and the terminal communicate in the NR-U frequency band of the unlicensed spectrum and the network side device configures at least one side link resource of the unlicensed frequency band and at least one resource of the licensed frequency band for the first terminal at the same time, if the target air interface resource of the unlicensed frequency band is not shared with the side link resource of the unlicensed frequency band, for example, the network side device does not preempt the resource of the unlicensed frequency band for the terminal, the terminal preferentially uses the resource in the side link resource pool of the licensed frequency band for side link communication. Of course, the method is not limited thereto, and in practical application, the priority of the second alternative resource may be higher than the priority of the first alternative resource in any case, which is not limited in the embodiment of the present application.

In another embodiment of the present application, the first resource may be a sidelink resource of an unlicensed frequency band, and the second resource is a resource in a sidelink resource pool in the licensed frequency band configured by the network side device for the first terminal. That is, in the process that the first terminal performs the sidelink communication under the unlicensed frequency band, under the condition that the target special condition occurs, the first terminal may switch to the network side device to perform the sidelink communication on the resources in the sidelink resource pool under the licensed frequency band configured for the first terminal. By the possible implementation manner, when the first terminal supports the side link communication on the unlicensed frequency band, the first terminal can switch to the licensed frequency band to perform the side link communication under the condition that the special condition occurs in the side link communication on the unlicensed frequency band, so that the continuity of the side link communication is ensured.

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

(1) Persistent LBT failure (consistent LBT failure);

(2) Channel Occupation Time (COT) sharing failure; the first terminal is the opposite terminal of the side link communication, and the second terminal fails to occupy the unlicensed frequency band resource.

(3) Persistent COT sharing failure. The first terminal is the opposite terminal of the side link communication, namely the second terminal is continuously failed to occupy the unlicensed frequency band resource, namely the number of continuous failures exceeds a certain value.

In one possible implementation manner, in a case that 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 resource in the sidelink resource pool for sidelink communication.

In one possible implementation, in the case where the target special condition includes a persistent LBT failure, the switching of the first terminal to a resource in the sidelink resource pool for sidelink communication may include: the first terminal is switched to the resources in the side link resource pool to carry out side link communication, and is switched to a third resource to execute LBT, wherein the third resource has the same granularity as the first resource; and stopping using the resources in the side link resource pool under the condition that the third resource performs LBT to obtain an available LBT result.

It should be noted that, in the unlicensed spectrum, the terminal may perform resource selection based on different granularity of resource selection, for example, perform resource selection based on carrier (carrier), perform resource selection based on Bandwidth Part (BWP), or perform resource selection based on resource pool (resource pool). The terminal may support its Sidelink (SL) transmission on one or more carriers on the unlicensed spectrum, depending on its own terminal capabilities. Further, one carrier may contain one or more bandwidth parts, and one bandwidth part may contain one or more resource pools.

In the possible implementation manner, when the first terminal performs the sidelink communication on the first resource, if the persistent LBT failure occurs, the first terminal may switch to the sidelink communication on the resource of the sidelink resource pool configured by the network side device for the first terminal, and at the same time switch to another unlicensed frequency band resource (i.e., the third resource) with the same granularity as the first resource to perform the LBT operation, and if the available LBT result is obtained, the LBT result may be that the LBT is successful or the LBT fails, and use of the resource in the sidelink resource pool is stopped. That is, in the case where the network-side device configures the first terminal with the sidelink resource pool, the first terminal may briefly use the resources in the sidelink resource pool.

In another possible implementation manner, to save power consumption of the first terminal and avoid frequently performing LBT operations, in a case where the target special condition includes persistent LBT failure, switching to the resource in the sidelink resource pool for sidelink communication by the first terminal may include: the first terminal switches to the resources in the side link resource pool to carry out side link communication, and starts a third timer; and under the condition that the third timer is overtime, the first terminal stops using the resources in the side link resource pool and performs LBT operation on the unlicensed frequency band.

Alternatively, the third timer may be configured by the network side device, for example, the network side device configures the third timer in advance through signaling, for example, the network side device broadcasts the configuration through a system information block (System Information Block, SIB), or the network side device configures through RRC dedicated signaling. Alternatively, it may be prescribed by a protocol, for example, the protocol may agree in advance on one or more lengths of the third timer, from which the first terminal may select an optional value as the timing length of the third timer. Under the condition that the protocol pre-agrees with a plurality of time durations, the first terminal can autonomously select one of the time durations as the timing time duration of the third timer. For example, the first terminal may select an optional value from a plurality of time periods according to the current electric quantity, if the current electric quantity is sufficient (for example, the current electric quantity is greater than a preset threshold value, such as 80%), a smaller optional value from a plurality of time periods may be selected, and if the current electric quantity is insufficient, a larger optional value from a plurality of time periods may be selected.

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 perform the sidelink communication on the resources of the sidelink resource pool configured for the first terminal, and at the same time switch to perform the LBT operation on another unlicensed frequency band resource (i.e., the third resource) with the same granularity as the first resource, and if an available LBT result is obtained, the LBT result may be that the LBT is successful or the LBT fails, the use of the resources in the sidelink resource pool is stopped.

In one possible implementation manner, 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, if the target special condition includes a failure of COT sharing or a failure of persistent COT sharing, switching, by the first terminal, to the resource in the sidelink resource pool to perform sidelink communication may include: the first terminal switches to the resources in the side link resource pool to carry out side link communication, and the side link resources are preempted for the second terminal on the unlicensed frequency band; and stopping using the resources in the side link resource pool under the condition that the first terminal successfully preempts the side link resources for the second terminal on the unlicensed frequency band.

Alternatively, in another possible implementation manner, in order to save the power of the first terminal, in a case where the target special condition includes a failure of COT sharing or a persistent failure of COT sharing, switching to the resource in the sidelink resource pool by the first terminal for sidelink communication may include: the first terminal switches to the resources in the side link resource pool to carry out side link communication, and starts a fourth timer; and under the condition that the fourth timer is overtime, the first terminal stops using the resources in the side link resource pool, and performs LBT operation on the unlicensed frequency band to preempt the side link resources for the second terminal. That is, in the case where the first terminal fails to perform the COT sharing or the persistent COT sharing, the first terminal may switch to the resources in the sidelink resource pool to perform sidelink communication (e.g., notify the second terminal of the failure to preempt the resources on the unlicensed band on the resources in the sidelink resource pool), while starting the fourth timer, and in the case where the fourth timer expires, stop using the resources in the sidelink resource pool and perform the LBT operation on the unlicensed band to preempt the sidelink resources for the second terminal.

Alternatively, the fourth timer may be configured by the network side device, for example, the network side device configures the fourth timer in advance through signaling, for example, the network side device configures through a system information block (System Information Block, SIB) broadcast, or the network side device configures through RRC dedicated signaling. Alternatively, it may be defined by a protocol, for example, the protocol may agree in advance on one or more durations of the fourth timer, from which the first terminal may select a selectable value as the timing duration of the fourth timer. Under the condition that the protocol pre-agrees with a plurality of time durations, the first terminal can autonomously select one of the time durations as the timing time duration of the fourth timer. For example, the first terminal may select an optional value from a plurality of time periods according to the current electric quantity, if the current electric quantity is sufficient (for example, the current electric quantity is greater than a preset threshold value, such as 80%), a smaller optional value from a plurality of time periods may be selected, and if the current electric quantity is insufficient, a larger optional value from a plurality of time periods may be selected.

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, switching to the resources in the sidelink resource pool for sidelink communication, and preempting the sidelink resources for the second terminal on the unlicensed frequency band, and then stopping using the resources in the sidelink resource pool if the first terminal is successful in preempting the sidelink resources for the second terminal on the unlicensed frequency band.

In an optional implementation manner of this embodiment of the present application, 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, the first terminal reports the target abnormal condition to the network side device. For example, in the case of a persistent COT sharing failure, the first terminal may report a configuration COT-sharing failure to the base station, where the base station instructs the UE1 to shift to mode1 or mode2 mode sidelink communication of the SL band.

In this embodiment of the present application, the sidelink resource pool may include a normal resource pool and a special resource pool, where a resource in the normal resource pool refers to a resource allowed to be used for sidelink transmission, which is different from a primary frequency point in an RRC idle state, an inactive state, or a connection state, and the special resource pool includes a resource allowed to be used by a terminal in the sidelink occurrence target special condition, that is, the special resource pool is a resource pool configured by a network side device specifically for the target special condition, where a resource is reserved by the network side device, and the terminal may use the resource in the special resource pool to perform sidelink communication in the target special condition.

In the foregoing embodiment, if the sidelink resource pool is a common resource pool under an authorized frequency band, the first terminal may first apply for the network side device when performing sidelink communication by using the resources in the sidelink resource pool, and after obtaining the consent of the network side device, perform communication by using the applied resources. If the side link resource pool is a special resource pool under the authorized frequency band, the first terminal can randomly use one of the resources to perform side link communication, and the first terminal can only temporarily use the resources in the special resource pool in order to avoid collision as far as possible because the resources in the special resource pool can be configured as the special resource pools of other terminals at the same time.

The technical solution provided in the embodiments of the present application is described below by taking the side link resource pool as a special resource pool of an authorized frequency band as an example.

In the following description, for convenience of distinction, a target special condition in which a terminal operates in an authorized frequency band is referred to as a conventional special condition, and a target special condition in which a terminal operates in an unauthorized frequency band is referred to as a novel special condition. The conventional special conditions include RRC reestablishment, RRC reconfiguration, cell handover, and the like. The new special conditions include special conditions under SL-U scenarios, such as consistent LBT failure, (existence) COT-sharing failure, etc. Without prefix, the special case includes both a traditional special case and a new special case.

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

In the embodiments described below, the recovery of the special condition may refer to RRC reestablishment completion, RRC reconfiguration completion, cell handover completion, etc. for the conventional special condition, and recovery from consistent LBT failure, (existence) COT-sharing failure, i.e., LBT success, COT-sharing success, etc. for the new special condition.

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

If the network only configures the SL special resource pool for the UE, the UE can briefly use the special resource pool before the traditional special condition is recovered.

(II) if the network configures SL-U band resources only for the UE, the UE may perform any one of the following processes 1 to 3.

1. If the network configures a timer-1 for the UE, the UE waits for the recovery of the special condition before the timer-1 times out; if the timer-1 is overtime, the UE switches to the SL-U frequency band to work, and performs LBT operation on the SL-U resources configured by the network, and attempts to acquire available resources for SL-U communication. The timer-1 may be configured by SIB broadcast or configured by RRC dedicated signaling.

2. If the UE is configured with the local timer-2, the local timer-2 is started, wherein the value range or the value range of the timer-2 is fixed, and the value range or the value range can be agreed by a protocol. Before the timeout of the timer-2, the UE waits for the recovery of a special condition, if the timeout of the timer-2 is caused, the UE is switched to SL-U frequency band work, LBT operation is executed on SL-U resources configured by a network, and available resources are tried to be acquired for SL-U communication;

3. if the network does not configure a timer-1 for the UE and the UE does not configure a local timer-2, the UE directly switches to SL-U frequency band operation, LBT operation is executed on SL-U resources configured by the network, and available resources are tried to be acquired for SL-U communication;

and thirdly, if the network configures a SL frequency band special resource pool and SL-U frequency band resources for the UE at the same time, the UE preferentially uses the SL resources or the SL-U resources according to a preset SL resource and SL-U resource priority rule.

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

rule 1: when the network allocates at least one SL-U resource for the UE or allocates at least one SL and at least one SL-U resource simultaneously, the SL-U resource is always preferentially used, namely the UE is not allowed to jump to the SL frequency band to work;

rule 2: when the network allocates at least one SL resource only or allocates at least one SL and at least one SL-U resource simultaneously for the UE, the SL resource is always preferentially used, namely the UE is not allowed to jump to the SL-U frequency band to work;

rule 3: when the network and the UE communicate through the NR-U frequency band, SL and SL-U resources are allocated for the UE at the same time, if the NR-U frequency band resources are shared with the SL-U resources, the UE preferentially uses the SL-U resources to carry out SL communication, otherwise, the SL resources are preferentially used to carry out SL communication.

In another possible embodiment, a special situation occurs for a UE operating in the SL band mode1 resource allocation mode, and if SL-U resources are configured, the UE preferentially switches to SL-U band operation and resumes SL band mode1 operation based on some conditions. Specifically, the UE may perform the following processing:

(II) if the network configures SL-U band resources only for the UE, the UE may perform the following processing of any one of 1 to 3.

1. The UE directly switches to SL-U frequency band to work, and LBT operation is executed on SL-U resources configured by the network, and the available resources are tried to be acquired to carry out SL-U communication until the UE is recovered from special conditions.

2. The UE switches to SL-U frequency band operation, and starts a local timer, timer-3, when timer-3 times out, and the UE recovers from the special condition.

3. If the network configures timer-4 for the UE, when timer-4 expires, the UE resumes from the special condition.

And thirdly, if the network configures the SL frequency band special resource pool and the SL-U frequency band resources for the UE at the same time, the UE can use the SL resources or the SL-U resources preferentially according to the SL resources and the SL-U resource priority rule.

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

In yet another possible embodiment, when a special condition occurs in the UE operating in the SL-U band, corresponding processing may be performed according to different special conditions.

(one) in case of UE occurrence consistent LBT failure

In this case, if the network configures the SL band special resource pool for the UE, the UE may briefly use the SL band special resource pool, and specifically, the UE may perform any one of the following operations:

(1) If the UE obtains the available LBT result after the LBT resource granularity is switched to the LBT resource, the UE stops using the SL frequency band special resource pool.

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

If the network does not configure the SL band special resource pool for the non-UE, the UE reports consistent LBT failure to the base station, which instructs the UE to switch to mode1 or mode2 of the SL band for operation.

(II) when the UE1 preempts SL-U resource for the UE2, COT-sharing failure occurs, the UE1 can execute corresponding operations according to two cases of 1 or 2 below.

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

(1) UE1 may briefly use the SL frequency band special resource pool. If UE1 recovers from the (existence) COT-sharing failure, UE1 stops using the SL band special resource pool.

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

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

The timer-4 and the timer-5 can be configured by SIB broadcasting or by RRC dedicated signaling.

It should be noted that, in the sidelink communication method provided in the embodiments of the present application, the execution body may be 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, a method for a sidelink communication device to perform sidelink communication is taken as an example, and the sidelink communication device provided in the embodiments of the present application is described.

Fig. 3 shows a schematic structural diagram of a sidelink communication device provided in an embodiment of the present application, where the device 300 may be applied to a first terminal, and as shown in fig. 3, the device 300 mainly includes a first communication module 301 and a second communication module 302.

In this embodiment of the present application, the first communication module 301 is configured to perform sidelink communication on a first resource, where the first terminal supports sidelink communication on an unlicensed frequency band; a second communication module 302, configured to switch to a second resource for side-link communication in the case of occurrence of a target special condition; the first resource is a dedicated side link resource under an authorized frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource under an unauthorized frequency band or a side link resource pool under an authorized frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal.

In one possible implementation, the switching of the second communication module 302 to the second resource for the sidelink communication includes:

and under the condition that the first resource is a special side link resource in an authorized frequency band scheduled by the network side equipment and the network side equipment does not configure the side link resource pool for the first terminal, switching to the side link resource in an unauthorized frequency band to perform side link communication.

In one possible implementation, the switching of the second communication module 302 to the sidelink resource of the unlicensed band for sidelink communication includes:

starting a first timer when the target special condition occurs;

and under the condition that the first timer is overtime, switching to the side link resource of the unlicensed frequency band to perform side link communication.

In one possible implementation, the first timer is configured for the network-side device or the first timer is protocol-agreed.

and executing Listen Before Talk (LBT) on the unlicensed frequency band, and under the condition that available resources are acquired from the unlicensed frequency band, performing side link communication by using the acquired available resources until the target special condition is recovered, and switching to the first resources to perform side link communication.

starting a second timer, during the operation of the second timer, performing Listen Before Talk (LBT) on the unlicensed frequency band, and in the case of acquiring available resources from the unlicensed frequency band, performing side link communication by using the acquired available resources;

and switching to the first resource for side link communication under the condition that the second timer is overtime and the target special condition is recovered.

In one possible implementation, the second timer is configured for the network side device or the second timer is protocol-agreed.

and under the condition that the first resource is a special side link resource in an authorized frequency band scheduled by the network side equipment and the network side equipment configures the side link resource pool for the first terminal, switching to the second resource to perform side link communication according to a preset priority rule, wherein the second resource is a resource with higher priority in a first alternative resource and a second alternative resource, the first alternative resource is the side link resource in the unauthorized frequency band, and the second alternative resource is the resource of the side link resource pool.

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

the priority of the first alternative resource is higher than the priority of the second alternative resource;

the second alternative resource has a higher priority than the first alternative resource.

In one possible implementation, the priority of the first alternative resource is higher than the priority of the second alternative resource, including: under the condition that 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 an air interface for communication between network side equipment and a terminal;

the second alternative resource having a higher priority than the first alternative resource, comprising: and under the condition that the target air interface resource of the unlicensed frequency band is not shared with the side link resource of the unlicensed frequency band, the priority of the second alternative resource is higher than that of the first alternative resource.

In one possible implementation, the target abnormal condition includes one of:

RRC reestablishment;

RRC reconfiguration;

cell switching.

In one possible implementation, where the first resource is a sidelink resource of an unlicensed frequency band, the target special condition comprises one of:

continuous LBT failure;

channel occupation time COT sharing fails;

persistent COT sharing fails.

and under the condition that the first resource is a side link resource of an unlicensed frequency band and the network side equipment configures the side link resource pool for the first terminal, switching to the resource in the side link resource pool to perform side link communication.

In one possible implementation, the switching of the second communication module 302 to the resources in the sidelink resource pool for sidelink communication includes:

switching to resources in the side link resource pool for side link communication and switching to a third resource for LBT under the condition that the target special condition comprises continuous LBT failure, wherein the third resource has the same granularity as the first resource;

and stopping using the resources in the side link resource pool under the condition that the third resource performs LBT to obtain an available LBT result.

switching to resources in the sidelink resource pool for sidelink communication and starting a third timer in case the target special condition comprises a persistent LBT failure;

and stopping using the resources in the side link resource pool and performing LBT operation on the unlicensed frequency band under the condition that the third timer is overtime.

In one possible implementation, the third timer is configured for the network-side device or the third timer is protocol-agreed.

switching to resources in the side link resource pool for side link communication and preempting side link resources for a second terminal on the unlicensed frequency band under the condition that the target special condition comprises COT sharing failure or continuous COT sharing failure;

and stopping using the resources in the side link resource pool under the condition that the second terminal is successfully preempted by the side link resources on the unlicensed frequency band.

switching to resources in the side link resource pool for side link communication and starting a fourth timer in the case that the target special condition includes a COT sharing failure or a persistent COT sharing failure;

and under the condition that the fourth timer is overtime, stopping using the resources in the side link resource pool, and performing LBT operation on the unlicensed frequency band to preempt the side link resources for the second terminal.

In one possible implementation, the fourth timer is configured for the network-side device or the fourth timer is protocol-agreed.

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

and reporting the target abnormal condition to the network side equipment under the condition that the first resource is a side link resource of an unlicensed frequency band and the network side equipment does not configure the side link resource pool for the first terminal.

The sidelink communication device in the embodiment of the 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. By way of example, mobile terminals may include, but are not limited to, the types of terminals 11 listed above, and non-mobile terminals may be servers, network attached storage (Network Attached Storage, NAS), personal computers (personal computer, PCs), televisions (TVs), teller machines, self-service machines, etc., and embodiments of the present application are not limited in detail.

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

The sidelink communication device provided in the embodiment of the present application can implement each process implemented by the method embodiment of fig. 2, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted herein.

Optionally, as shown in fig. 4, the embodiment of the present application further provides a communication device 400, including a processor 401, a memory 402, and a program or an instruction stored in the memory 402 and capable of running on the processor 401, where, for example, the communication device 400 is a terminal, the program or the instruction is executed by the processor 401 to implement each process of the above-mentioned embodiment of the sidelink communication method, and achieve the same technical effects. In order to avoid repetition, a description thereof is omitted.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for realizing the processes of the embodiment of the side link communication method, and the communication interface is used for communicating with external communication equipment. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment are applicable to the terminal embodiment and can achieve the same technical effects. Specifically, fig. 5 is a schematic hardware structure of a terminal for implementing an embodiment of the present application.

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

Those skilled in the art will appreciate that the terminal 500 may further include a power source (e.g., a battery) for powering the various components, and the power source may be logically coupled to the processor 510 via a power management system so as to perform functions such as managing charging, discharging, and power consumption via the power management system. The terminal structure shown in fig. 5 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 504 may include a graphics processor (Graphics Processing Unit, GPU) 5041 and a microphone 5042, with the graphics processor 5041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. 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. Touch panel 5071, also referred to as a touch screen. 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, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from a network side device, the radio frequency unit 501 processes the downlink data with the processor 510; in addition, the uplink data is sent to the network side equipment. Typically, 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 may be used to store software programs or instructions as well as various data. The memory 509 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 509 may include a high-speed random access memory, and may further include a non-transitory memory, wherein the non-transitory memory may be a Read-only memory (ROM), a programmable Read-only memory (ProgrammableROM, PROM), an erasable programmable Read-only memory (ErasablePROM, EPROM), an electrically erasable programmable Read-only memory (ElectricallyEPROM, EEPROM), or a flash memory. Such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device.

Processor 510 may include one or more processing units; alternatively, the processor 510 may integrate an application processor that primarily processes operating systems, user interfaces, and applications or instructions, etc., with a modem processor that primarily processes wireless communications, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 510.

The radio frequency unit 501 is configured to perform sidelink communication on a first resource, where the terminal supports sidelink communication on an unlicensed frequency band; and in case of occurrence of a target special condition, the first terminal switches to a second resource for side link communication;

the first resource is a dedicated side link resource under an authorized frequency band scheduled by the network side equipment for the first terminal, and the second resource is a side link resource under an unauthorized frequency band or a side link resource pool under an authorized frequency band configured by the network side equipment for the first terminal; or the first resource is a side link resource of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal.

In the embodiment of the application, a first terminal supporting sidelink communication on an unlicensed frequency band switches to a second resource to perform sidelink communication under the condition of generating a target characteristic state when the first resource performs sidelink communication, wherein the first resource is a dedicated sidelink resource under an licensed frequency band scheduled by a network side device for the first terminal, and the second resource is a sidelink resource of the unlicensed frequency band or a resource in a sidelink 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 of an unlicensed frequency band, and the second resource is a resource in a side link resource pool under the licensed frequency band configured by the network side equipment for the first terminal. Thus, a processing scheme of a terminal supporting side link communication on an unlicensed frequency band in the case of occurrence of a special state is provided.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the processes of the above-mentioned embodiments of the sidelink communication method are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The embodiment of the application further provides a chip, the chip 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 an instruction, implement each process of the above-mentioned sidelink communication method embodiment, and achieve the same technical effect, so as to avoid repetition, and not be repeated here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product, where 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 each process of the above-mentioned embodiments of the sidelink communication method, and the same technical effects are achieved, so that repetition is avoided, and details are not repeated herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., 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.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A method of sidelink communication, comprising:

the first terminal performs side link communication on a first resource;

under the condition of the occurrence of a target special condition, the first terminal is switched to a second resource to carry out side link communication;

2. The method of claim 1, wherein the first terminal switching to the second resource for sidelink communication comprises:

and under the condition that the first resource is a special side link resource in an authorized frequency band scheduled by the network side equipment and the network side equipment does not configure the side link resource pool for the first terminal, the first terminal switches to the side link resource in an unauthorized frequency band to perform side link communication.

3. The method of claim 2, wherein the first terminal switching to the unlicensed band of sidelink resources for sidelink communications comprises:

the first terminal starts a first timer when the target special condition occurs;

and under the condition that the first timer is overtime, the first terminal is switched to the side link resource of the unlicensed frequency band to perform side link communication.

4. A method according to claim 3, wherein the first timer is configured for the network side device or the first timer is protocol-agreed.

5. The method according to any one of claims 2 to 4, wherein the switching of the first terminal to the unlicensed band of sidelink resources for sidelink communication comprises:

And the first terminal executes Listen Before Talk (LBT) on the unlicensed frequency band, and under the condition that available resources are acquired from the unlicensed frequency band, the acquired available resources are used for carrying out side link communication until the target special condition is recovered, and then the first terminal is switched to the first resources for carrying out side link communication.

6. The method according to any one of claims 2 to 4, wherein the switching of the first terminal to the unlicensed band of sidelink resources for sidelink communication comprises:

the first terminal starts a second timer, during the operation of the second timer, listen Before Talk (LBT) is performed on the unlicensed frequency band, and in the case that available resources are acquired from the unlicensed frequency band, the acquired available resources are used for side-link communication;

and under the condition that the second timer is overtime and the target special condition is recovered, the first terminal is switched to the first resource for side link communication.

7. The method of claim 1, wherein the first terminal switching to the second resource for sidelink communication comprises:

under the condition that the first resource is a dedicated side link resource in an authorized frequency band scheduled by the network side equipment and the network side equipment configures the side link resource pool for the first terminal, the first terminal switches to the second resource to perform side link communication according to a preset priority rule, wherein the second resource is a resource with higher priority in a first alternative resource and a 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 of the side link resource pool.

8. The method of claim 7, wherein the preset priority rule comprises one of:

9. The method of claim 8, wherein the step of determining the position of the first electrode is performed,

the priority of the first alternative resource is higher than the priority of the second alternative resource, comprising: under the condition that 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 an air interface for communication between network side equipment and a terminal;

10. The method according to any one of claims 2 to 9, wherein the target specific condition comprises one of:

Radio resource control, RRC, reestablishment;

RRC reconfiguration;

cell switching.

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

continuous LBT failure;

channel occupation time COT sharing fails;

persistent COT sharing fails.

12. The method of claim 11, wherein the first terminal switching to the second resource for sidelink communication comprises:

and under the condition that the first resource is a side link resource of an unlicensed frequency band and the network side equipment configures the side link resource pool for the first terminal, the first terminal is switched to the resource in the side link resource pool to perform side link communication.

13. The method of claim 12, wherein the first terminal switching to resources in the sidelink resource pool for sidelink communication comprises:

in the case that the target special condition includes continuous LBT failure, the first terminal switches to a resource in the side link resource pool to perform side link communication, and switches to a third resource to perform LBT, wherein the third resource has the same resource granularity as the first resource;

14. The method of claim 12, wherein the first terminal switching to resources in the sidelink resource pool for sidelink communication comprises:

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

and under the condition that the third timer is overtime, the first terminal stops using the resources in the side link resource pool and performs LBT on the unlicensed frequency band.

15. The method of claim 12, wherein the first terminal switching to resources in the sidelink resource pool for sidelink communication comprises:

under the condition that the target special condition comprises COT sharing failure or continuous COT sharing failure, the first terminal switches to resources in the side link resource pool to carry out side link communication, and preempts side link resources for a second terminal on the unlicensed frequency band;

and stopping using the resources in the side link resource pool under the condition that the first terminal successfully preempts the side link resources for the second terminal on the unlicensed frequency band.

16. The method of claim 12, wherein the first terminal switching to resources in the sidelink resource pool for sidelink communication comprises:

in the case that the target special condition includes a COT sharing failure or a continuous COT sharing failure, the first terminal switches to a resource in the side link resource pool to perform side link communication, and starts a fourth timer;

and under the condition that the fourth timer is overtime, the first terminal stops using the resources in the side link resource pool, and performs LBT operation on the unlicensed frequency band to preempt the side link resources for the second terminal.

17. The method of claim 11, wherein the method further comprises:

and under the condition that the first resource is a side link resource of an unlicensed frequency band and the network side equipment does not configure the side link resource pool for the first terminal, the first terminal reports the target special condition to the network side equipment.

18. The method according to any one of claims 1 to 17, wherein the side link resource pool comprises: the method comprises a common resource pool and a special resource pool, wherein the common resource pool comprises resources which are allowed to be used for side link transmission and are different from a main frequency point by a terminal in a Radio Resource Control (RRC) idle state, an inactive state or a connection state, and the side link special resource pool comprises resources which are allowed to be used by the terminal under the condition that a side link generates the target special condition.

19. A sidelink communication apparatus for use with a first terminal, said apparatus comprising:

a first communication module for performing side link communication at a first resource;

the second communication module is used for switching to a second resource to carry out side link communication under the condition of occurrence of a target special condition;

20. The apparatus of claim 19, wherein the second communication module switching to the second resource for sidelink communication comprises:

21. The apparatus of claim 20, wherein the second communication module switching to the unlicensed band of sidelink resources for sidelink communication comprises:

starting a first timer when the target special condition occurs;

22. The apparatus according to any one of claims 19 to 21, wherein switching the second communication module to the unlicensed band of sidelink resources for sidelink communication comprises:

23. The apparatus according to any one of claims 19 to 21, wherein switching the second communication module to the unlicensed band of sidelink resources for sidelink communication comprises:

24. The apparatus of claim 19, wherein the second communication module switching to the second resource for sidelink communication comprises:

25. The apparatus of claim 19, wherein the second communication module switching to the second resource for sidelink communication comprises:

26. The apparatus of claim 25, wherein the second communication module switching to resources in the side link resource pool for side link communication comprises:

27. The apparatus of claim 25, wherein the second communication module switching to resources in the side link resource pool for side link communication comprises:

and stopping using the resources in the side link resource pool and executing LBT on the unlicensed frequency band under the condition that the third timer is overtime.

28. The apparatus of claim 25, wherein the second communication module switching to resources in the side link resource pool for side link communication comprises:

29. The apparatus of claim 25, wherein the second communication module switching to resources in the side link resource pool for side link communication comprises:

30. The apparatus of claim 25, wherein the second communication module is further configured to:

31. A terminal comprising a processor, a memory and a program or instruction stored on the memory and executable on the processor, which when executed by the processor implements the steps of the sidelink communication method of any of claims 1 to 18.

32. A readable storage medium, characterized in that it stores thereon a program or instructions, which when executed by a processor, implements the steps of the sidelink communication method of any of claims 1 to 18.