CN117641600A

CN117641600A - Channel access processing method and device applied to through link and user equipment

Info

Publication number: CN117641600A
Application number: CN202210961351.3A
Authority: CN
Inventors: 王亚坤; 赵锐; 温小然; 郑石磊; 赵丽
Original assignee: CICTCI Technology Co Ltd
Current assignee: CICTCI Technology Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2024-03-01

Abstract

The invention provides a channel access processing method, a device and user equipment applied to a direct link, and relates to the technical field of communication. The channel access processing method applied to the through link, which is executed by the first terminal, comprises the following steps: determining single-channel and/or multi-channel access parameters of a first terminal; and determining that the first terminal executes a single-channel and/or multi-channel access process according to the channel access parameters. The technical scheme of the invention defines a processing mechanism that the terminal can carry out single channel and/or multi-channel in the direct link, and reduces the interference to other systems working in an unlicensed frequency band.

Description

Channel access processing method and device applied to through link and user equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a user equipment for processing channel access applied to a through link.

Background

3GPP (third Generation partnership project) has introduced SL-U (Sidelink Operation on Unlicensed Spectrum, straight-through link operating in unlicensed bands) in the prior art. Compared with the communication mechanism of the authorized frequency band, the device working on the unauthorized frequency band can use the frequency band without authorization, so in order to avoid mutual interference among different systems, an LBT (Listen Before Talk ) mechanism is introduced, or the LBT judges whether the channel is idle or not, and the transmission can be carried out only when the channel is idle.

In the prior art, a using method of the received COT (Channel Occupied Time, channel occupation time) in a distributed resource allocation mechanism is not considered, and an NR-U (New radio operation on unlicensed spectrum, a new air interface working in an unlicensed frequency band) considers that COT information is shared in a scheduling-based mode; the prior art lacks a multi-subband (or alternatively, as a multi-channel) LBT mechanism suitable for a through link.

Disclosure of Invention

The invention aims to provide a channel access processing method, a device and user equipment applied to a through link, and a multi-channel LBT mechanism applicable to the through link is defined.

To achieve the above object, an embodiment of the present invention provides a channel access processing method applied to a through link, which is executed by a first terminal, the method including:

determining single-channel and/or multi-channel access parameters of a first terminal;

and determining that the first terminal executes a single-channel and/or multi-channel access process according to the channel access parameters.

To achieve the above object, an embodiment of the present invention further provides a channel access processing method applied to a through link, which is performed by a second terminal, the method including:

Determining COT sharing information sent by a first terminal;

and determining that the second terminal executes a second type channel access process according to the COT sharing information.

To achieve the above object, an embodiment of the present invention further provides a channel access processing apparatus applied to a through link, performed by a first terminal, the apparatus including:

a first determining module, configured to determine a channel access parameter of a single channel and/or multiple channels of a first terminal;

and the second determining module is used for determining that the first terminal executes a single-channel and/or multi-channel access process according to the channel access parameters.

To achieve the above object, an embodiment of the present invention further provides a channel access processing apparatus applied to a through link, performed by a second terminal, the apparatus including:

a third determining module, configured to determine COT sharing information sent by the first terminal;

and the fourth determining module is used for determining that the second terminal executes the second type channel access process according to the COT sharing information.

To achieve the above object, an embodiment of the present invention further provides a user equipment, including: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the processor, when executing the program or instructions, implements a channel access processing method applied to a through link as set forth in any one of the above.

To achieve the above object, an embodiment of the present invention further provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement a channel access processing method applied to a through link as set forth in any one of the above.

The technical scheme of the invention has the following beneficial effects:

in the embodiment of the invention, the first terminal determines the channel access parameters of a single channel and/or multiple channels of the first terminal; and determining that the first terminal executes a single-channel and/or multi-channel access process according to the channel access parameters. The invention perfects the direct link channel access processing flow, defines the channel access process of the terminal capable of multiple channels, and reduces the interference to other systems working in unauthorized frequency bands.

Drawings

Fig. 1 is a flowchart of a processing method applied to a first terminal according to an embodiment of the present invention;

FIG. 2 is a block diagram of a first embodiment provided in accordance with an embodiment of the present invention;

FIG. 3 is a block diagram of a second embodiment provided in accordance with an embodiment of the present invention;

FIG. 4 is a block diagram of a third embodiment provided in accordance with an embodiment of the present invention;

fig. 5 is a flowchart of a processing method applied to a second terminal according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a processing apparatus according to an embodiment of the present invention;

FIG. 7 is a second block diagram of a processing apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram of a user equipment according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

In addition, the terms "system" and "network" are often used interchangeably herein.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the "first" and "second" distinguished objects generally are of the type and do not limit the number of objects, e.g., 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.

In describing embodiments of the present invention, some concepts used in the following description are first explained.

1. Unlicensed frequency bands: unlicensed spectrum is free to try out without application, and is available to any party or individual, for example: the technologies of WiFI (wireless network communication technology), bluetooth and the like all use unlicensed frequency bands. In order to avoid interference between different systems, when using unlicensed frequency bands, interference to other systems needs to be avoided as much as possible, so that LBT technology is introduced, channels need to be monitored before the channels are accessed, and the channels can be accessed when the monitored systems are idle.

Terminal devices operating in unlicensed bands require a limit of 80% of the occupied bandwidth (OccupiedChannel Bandwidth, OCB for short), further supplementing the limit of 80% with respect to OCB: the 80% constraint of OCB is based on LBT subband (20 MHz in size). For example: the current total bandwidth is 20MHz, i.e. one LBT subband, the terminal transmission needs to meet 80% of the OCB requirements. If the current total bandwidth is 40MHz, i.e. includes two LBT subbands, if the transmission of the terminal is located in the upper or lower LBT subband, the occupied bandwidth needs to be greater than or equal to 80% of the corresponding LBT subband (i.e. 80% of 20 MHz); if the terminal transmission needs to span two LBT subbands, the occupation of each corresponding LBT subband needs to satisfy 80%.

It should be noted that the LBT subband may be referred to as a single RB set (resource block set) or a single channel, and the multiple LBT subband may be referred to as multiple RB sets or multiple channels.

2. LBT (Listen Before Talk ) mechanism.

The terminal working in the unlicensed frequency band needs to detect the channel before the channel is accessed, and can access the channel only when the channel is detected to be idle, so as to transmit the service to be transmitted. The channel detection mode comprises the following steps:

(1) Type 1 channel access mode:

the terminal first determines the priority of channel access, and then determines the relevant parameters of channel access, as shown in the following table. The flow is as follows:

step 1: a counter n=nint is set, where Nint is a random number uniformly distributed between 0 and CWp, and Step 4 is then performed.

Step 2: if N >0, the terminal decrements the counter by 1, i.e., n=n-1.

Step 3: detecting a channel as a monitoring time slot with the length of Tsl (Tsl represents an LBT monitoring time slot with the length of 9 mu s), and executing Step 4 if the monitoring time slot is idle; otherwise, step 5 is performed.

Step 4: if n=0, ending the channel pickup process; otherwise, step 2 is performed.

Step 5: the channel is subjected to a detection of a time interval of time length Td (where td=16+mp×9 μs), the result of which is either that at least one listening slot is occupied or that all listening slots are idle.

Step 6: if the channel monitoring result is that all monitoring time slots are idle in the Td time, executing Step 4; otherwise, step 5 is performed.

If the channel access process is finished, the terminal determines the corresponding maximum channel occupation time T _mcot,p And then using the channel to transmit the service to be transmitted. The COT (Channel Occupied Time, channel occupancy time) of the terminal cannot exceed the maximum channel occupancy time T corresponding to its channel access priority _mcot,p . Meanwhile, after the terminal acquires the COT, the COT can be shared with other terminals, which is called COT sharing (COT sharing), so that different users of the same system can continuously occupy the system, and other systems are prevented from being accessed in the middle to preempt channels. The channel access priority class is shown in the following table:

wherein CW is _min，p May be referred to as a minimum contention window size, CW _max，p May be referred to as a maximum contention window size, T _mcot，p May be referred to as the maximum channelTime of occupation, and CW _p May be referred to as a set of allowed contention window sizes.

(2) Type2 channel access mode:

after acquiring the COT shared by other terminals, the terminal can evaluate the channel in a Type2 mode before transmission, wherein the Type2 channel access mode is a channel access mode based on the fixed channel monitoring length, and the three modes are as follows:

1) Type 2A channel access:

the terminal performs channel monitoring of at least 25 mu s before transmission starts, and performs transmission after the channel monitoring is successful.

2) Type 2B channel access:

the terminal performs channel monitoring of 16 mu s before transmission starts, and performs transmission after the channel monitoring is successful.

3) Type 2C channel access:

the terminal does not need to monitor the channel and directly transmit. Wherein the gap between the start position of the transfer and the end position of the last transfer is less than or equal to 16 mus and the length of the transfer does not exceed 584 mus.

It should be noted that, the "first Type channel access" referred to below is denoted as a Type1 channel access procedure, or denoted as Type1 LBT; the "second Type channel access" is denoted as a Type2 channel access procedure, or as a Type2 LBT.

As shown in fig. 1, a channel access processing method applied to a through link according to an embodiment of the present invention is performed by a first terminal (first UE), and the method includes:

step 100, determining the channel access parameters of a single channel and/or multiple channels of a first terminal;

step 200, determining that the first terminal executes a single-channel and/or multi-channel access process according to the channel access parameters.

It will be appreciated that the terminal may determine whether to perform a single channel access or a multi-channel access based on the resources, e.g., the transmission occupies multiple channels, and then the multi-channel access procedure needs to be performed. The present invention can correspond the channel access parameters to the service priorities, and after the different channel access parameters are obtained, the service priorities of the corresponding channel accesses are determined, and after the service priorities are passed, the corresponding channel access process is determined to be executed by the first terminal. Of course, the present invention is not limited to the above-described service priority channel access procedure.

In the embodiment of the invention, the first terminal performs a single-channel and/or multi-channel access process before channel access, or the first terminal performs a single-channel or multi-channel access process before channel access, and then performs COT sharing.

Optionally, after the first terminal performs the channel access procedure, the method further includes:

step 300, the first terminal determines and shares the COT sharing information; the COT sharing information at least includes at least one of:

The COT start time, the COT time interval, the COT end time, the remaining COT time, the priority, the channel access priority, the time occupied by the first terminal's own transmission, the second terminal's identification ID, and the indication information of the plurality of sets of COT subsets. The indication information of the plurality of sets of the COT subsets may include at least one of a start time, an interval, an end time of the COT subsets, a channel access priority, and a target user identifier corresponding to the COT subsets. In addition, the sum of the durations corresponding to the plurality of sets of COT subsets may be less than or equal to the total duration of COT.

In this embodiment, after the channel access procedure is executed by the first UE, particularly after the channel access procedure is successful, the COT sharing UE (UE that determines and sends the COT sharing information, that is, the first UE) directly sends configured COT sharing information to other UEs, where the COT sharing information includes one or more sets of COT subset indication information. The COT configuration information at least includes: at least one of start time, interval, end time, channel access priority, and target user identification representation corresponding to the COT subset; the COT sharing information includes: the COT start time, the COT time interval, the COT end time, the remaining COT time, the priority, the channel access priority, the time occupied by the first terminal's own transmission, the second terminal's identification ID, and the indication information of the plurality of sets of COT subsets.

It should be noted that, the identification ID of the second terminal may be a target user ID of unicast or a Destination ID (target ID) of multicast or broadcast.

Further, the first terminal decodes the COT configuration information, and determines whether the transmission of the first terminal is within the configured COT, if so, the transmission corresponding to the first terminal can execute a Type 2 channel access procedure before transmission. Here, the calculation of the COT is mainly determined by the information provided by the transmitting terminal, i.e., the COT information provided by the first terminal.

It should be further noted that, after the first terminal performs the channel access procedure, particularly after the channel access procedure is successful, the COT sharing UE shares COT sharing information, where the COT sharing information at least includes at least one of the following: the indication information of the plurality of sets of COT subsets, such as COT start time, COT time interval, COT end time, priority, channel access priority, time occupied by self transmission of the first terminal, and the like. The indication information of the plurality of sets of COT subsets can comprise at least one of start time, interval, end time, channel access priority and target user identification corresponding to the COT subsets; the first terminal does not determine which terminal shares the COT sharing information, so the calculation of the COT is mainly determined by the receiving terminal, that is, the second terminal determines the COT according to the COT sharing information, and determines whether the second terminal can access the Type 2 channel within the COT time period.

According to the invention, whether the self transmission of the first UE is within the COT shared by other received UE is determined through step 300, and if the self transmission is within the COT, the UE executes a Type2 channel access process, so that the channel access time length is reduced; meanwhile, the scheme that the COT shared information only comprises the COT related information is more suitable for distributed resource scheduling, and because whether other UE uses the COT shared information cannot be determined, in order to avoid interference among different systems, the COT shared information is assumed to be utilized to the greatest extent, and therefore the determined residual COT time is definitely effective.

In the prior art, it is assumed that a UE has multiple transmissions (multiple transmissions may be located in the same LBT sub-band or different LBT sub-bands), where the starting time of a channel access procedure for a certain transmission is before the end of a certain or multiple previous transmissions, and the UE cannot receive during transmission due to the effect of half duplex, and the channel access procedure itself is a receiving procedure (determining whether the energy of a channel listening slot or a channel listening time interval is greater than or equal to a threshold value), so that the channel access procedure at the transmitting time is calculated, and the prior art does not give an explicit calculation or determination.

In the aspect that the prior art does not provide a clear problem of calculating the sending time of the channel access process, the method of the invention also provides the following determination modes of the Type 1 channel access process and the Type 2 channel access process:

specifically, when the channel access process is a first type channel access process, the method further includes:

step 410, determining a channel occupancy state of a first transmission period, including at least one of:

the channel occupation state of the first sending time period is an occupied state;

the channel occupation state of the first sending time period is an idle state;

the first transmission time period is a time period when the first terminal transmits in the process of executing the first type channel access.

The transmission is not limited to the uplink transmission and/or the uplink transmission, and includes uplink transmission by the UE, transmission of a synchronization signal, transmission of a positioning signal, and the like.

In this embodiment, the channel occupancy state may be determined in the first transmission period, and the channel occupancy level for a period of time is estimated based on the channel occupancy state in the first transmission period for the channel occupancy level for the period of time. The first terminal may collect occupancy information regarding the unlicensed spectrum to form a view of whether the channel is shared with many active devices, and such occupancy level determined by the first terminal may be used by the network (e.g., base station), the second terminal, etc., to decide whether the unlicensed band may be used to transmit data.

Specifically, in step 410, when the channel occupancy state of the first transmission period is the occupied state, the first type channel access procedure is continuously executed after the first transmission period, and it is determined that the value of the counter maintains the value before the first transmission period.

In this embodiment, the first UE performs a Type 1 channel access procedure: the channel is considered to be occupied in the first transmission period, the channel access process is continuously performed after the transmission is finished, namely, the Type 1 channel access process is continuously performed after the first transmission period, and the value of the counter N before the transmission is still kept is determined.

Specifically, in step 410, when the channel occupancy state of the first transmission period is the idle state, the counter is iteratively counted down according to the channel listening time unit in the first transmission period. The channel listening time unit may be a channel listening slot or a channel listening interval.

In this embodiment, the first UE performs a Type 1 channel access procedure: the channel is considered idle during the first transmission period in which the value of the counter N is decremented by 1 every one channel listening slot or channel listening interval has elapsed during the first transmission period.

Specifically, when the channel access procedure is a second type channel access procedure, the method further includes:

step 510, the first terminal determines the channel occupancy state of the second transmission time period;

step 520, judging whether the second type channel access process is successful or not according to the channel occupation state of the second transmission time period;

wherein the channel occupancy state of the second transmission period includes at least one of:

the channel occupation state of the second sending time period is an occupied state;

the channel occupation state of the second sending time period is an idle state;

the second transmission time period is a time period when the first terminal transmits in the process of executing the second type channel access.

The transmission is not limited to the uplink transmission and/or the uplink transmission, but includes uplink transmission by the UE, transmission of a synchronization signal, transmission of a positioning signal, and the like; or a period of time due to the inability of transmission to receive due to half duplex limitations.

In this embodiment, the first UE performs a Type2 channel access procedure: and considering the channel to be occupied in the second sending time period, and judging whether the Type2 channel access process is successful or not by judging whether the idle time of the channel in the channel access time period meets the requirement of the Type2 channel access success or not. Further, the channel is considered to be idle in the second sending time period, and whether the Type2 channel access process is successful is judged by whether the idle time of the channel in the channel access time period meets the requirement of the Type2 channel access success or not.

In the invention, in a preferred case, the channel occupation state of the first transmission time period or the second transmission time period is more prone to be the occupied state, and the two modes can not evaluate the current channel condition by mistake due to the half duplex problem, so that the interference among different systems can be effectively reduced, and the influence and the solution of the half duplex problem on the channel access process are clarified.

It should be noted that, the case that the channel occupancy state of the first transmission period or the second transmission period is the idle state is assumed to be the optimal case, so that the first UE may access the channel faster, and there may be a lower accuracy of channel estimation.

As shown in fig. 2, in the first embodiment. In the process of "transmission resource" in fig. 2, it should be noted that a dashed box indicates a channel listening time unit, for example, the first channel listening time unit is on the right side, the initial value of the first channel listening time unit determined by the UE is 10, and the results of the first 5 channel listening time units are all idle, so the counter N is reduced to 5 before transmission. The UE then needs to perform traffic transmission and cannot continue channel listening due to half duplex limitations. Channel listening is continued after transmission and the channel is considered to be in an occupied state for the transmission period, so the counter N is still 5 when channel listening is continued after transmission. The channel listening process then continues. The invention clarifies the influence of the UE itself transmission on the channel access.

Optionally, in the channel access procedure in step 200, since the duration of the Type1 channel access procedure is not determined, there may be a preset time difference Tgap between the time of successful channel access and the actual transmission. It should be noted that, the actual transmission may refer to a transmission corresponding to the first type channel access procedure, or a transmission subsequent to the transmission corresponding to the first type channel access procedure. In addition, a limiting condition may be added, and the subsequent transmission and the transmission corresponding to the first type channel access procedure are located in the same channel/RB set/LBT sub-band.

Further, if there is a preset time difference between the time when the first type channel access procedure is executed and the actual transmission, the method further includes:

step 610, if the time difference is less than or equal to the configured or preconfigured preset time threshold value, switching to execute the channel access process of the specific time length before transmission; the specific time length here includes at least one channel detection slot or interval. The channel access procedure for a certain length of time here may also be a second type of channel access procedure.

Step 620, if the time difference is greater than the configured or preconfigured preset time threshold value, the first terminal re-executes the first type channel access procedure before transmission.

It will be appreciated that, since the duration of the Type1 channel access is not determined, there may be a certain time difference Tgap between the time of successful channel access and the actual transmission.

In this embodiment, the UE needs to additionally perform the Type2 channel access procedure before transmitting, where the time difference Tgap needs to be defined: in step 610, if the time difference Tgap is less than or equal to the preset time threshold, the first UE is supported to perform the Type2 channel access procedure before sending, and if the channel is idle, the transmission can be performed. Alternatively stated, in step 620, if the time difference Tgap is greater than the preset time threshold, the first UE needs to re-perform the Type1 channel access procedure before transmitting.

The invention limits the condition that the time difference of the Type2 channel access mechanism can be met before the service transmission after the Type1 channel access mechanism is executed; compared with the method for directly executing Type2 channel access without the limitation of the preset time threshold value, the method is more suitable for changeable channel environments after the preset time threshold value is increased, can more accurately evaluate the current channel environment, and reduces the interference between systems.

Optionally, before the channel access procedure in step 200, the method further includes:

Step 700, determining a first start time for performing a first type of channel access procedure, the first start time being a service packet arrival time or a first start time, the first start time being before the service packet arrival time.

In this embodiment, the duration of LBT after resource selection can be shortened by defining that the start time of Type 1 channel access is LBT for a period of time before the resource selection time, i.e., before the resource selection time, in step 700.

Optionally, in step 700, in the case that the first start time is the first start time, the method further includes:

the first starting time is determined according to at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

It should be noted that the first starting time may also be determined according to a preset time interval, that is, the first starting time is a difference between the arrival time of the service packet and the time interval. The time interval may be a configured or preconfigured value, or determined from at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

In this embodiment, when the first UE executes the periodic service and the resource selection time of the first UE is the service packet arrival time, the first start time of Type1 channel access may be before the service packet arrival time (the service packet arrival time is the R16 NR-V2X resource selection time), that is, the first start time is the first start time; further, the duration of LBT after resource selection can be shortened by determining the first starting time through at least one of the channel access priority, the minimum channel access duration, the priority, and the channel access procedure initialization value N.

Specifically, the channel access priority may be a configured or preconfigured value, or may be obtained according to a service transmitted in history.

The time interval between the first start time of the Type1 channel access and the arrival time of the service packet may be (pre) configured or determined according to the minimum duration of the Type1 channel access. In addition, the channel access priority of the Type1 channel access procedure in this case may be (pre) configured or acquired from historically transmitted traffic.

Optionally, in step 700, when the first start time is a service packet arrival time, the method further includes:

Determining the resource selection time as the sum of the arrival time of the service packet and a first time interval;

the first time interval is a configured or preconfigured value, or is determined according to at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

In this embodiment, when the first UE executes the periodic service and the resource selection time of the first UE is the sum of the service packet arrival time and the preset time interval, the first start time of Type1 channel access is the service packet arrival time. The above-mentioned preset time interval is a (pre) configuration or is determined according to at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

It should be further noted that, when the first UE performs the aperiodic service, the second mode can only be adopted because the service packet time reaches the uncertainty.

In a second embodiment, as shown in fig. 3, the arrival time of a service packet of a periodic service is N times, and at this time, the first UE may determine the priority of the service packet, further determine the channel access priority and the counter N value of the channel access process, where the time for the first UE to perform resource selection is n+type1 channel access minimum time, where Type1 channel access minimum time is n×tsl (Tsl represents an LBT monitoring slot). The invention clarifies the relation between the resource selection time and the channel access starting time.

Optionally, the first terminal in step 200 performs a multi-channel access procedure, including:

step 810, determining a first channel access procedure initialization value for each channel to perform a first type of channel access procedure;

it may be understood that the first terminal performs a multi-channel access procedure, and when a single transmission of the first UE occupies a plurality of LBT subbands (channels) or a plurality of transmissions corresponding to the same transport block TB of the first UE are located in a plurality of LBT subbands (channels), the initialization value of the first channel access procedure determined in step 810 is the value of the counter N.

Specifically, the step 810 includes:

step 811, obtaining the second channel access priority of the first terminal, and determining the contention window value CW of the first terminal _p From the set of allowed contention window sizes [0, cw ] for each channel separately _p ]And randomly selecting a numerical value as a first channel access process initialization value corresponding to each channel.

In this embodiment, the first UE determines the CW based on the channel access priority (the channel access priorities of the plurality of subbands are the same) _p (CW _p May be referred to as an allowed contention window sizeFrom a set of [0 ], CW) for each subband _p ]As a first channel access procedure initialization value N for the corresponding LBT subband (channel).

Alternatively, step 812, from the set of allowed contention window sizes [0, CW _p ]A numerical value is randomly selected and used as a first channel access process initialization value corresponding to each channel;

in this embodiment, the first UE determines the CW based on the channel access priority (the channel access priorities of the plurality of subbands are the same) _p Then from [0, CW _p ]As a first channel access procedure initialization value N for a plurality of LBT subbands (channels).

Alternatively, step 813, the transmission from the set of allowed contention window sizes [0, cw, respectively, for each channel _p ]And taking the maximum value or the minimum value as a first channel access process initialization value corresponding to each channel.

In this embodiment, the first UE determines the CW based on the channel access priority (the channel access priorities of the plurality of subbands are the same) _p Then for each sub-band, from [0, CW _p ]And taking the maximum value or the minimum value of the random number as a first channel access process initialization value N of a plurality of LBT sub-bands (channels).

It should be noted that [0, cwp ] in steps 811 to 813 may also be set as follows: the three conditions of (0, CWp), (0, CWp) and (0, CWp) can be set according to the specific scene as required, and are not limited herein.

Step 820 determines a second start time for each channel to perform the first type of channel access procedure.

Here, the start time of the LBT for a plurality of transmissions is determined.

Specifically, step 820 includes:

in step 821, the first UE performs LBT after selecting the resource, and if multiple transmissions or single transmissions are located in different LBT subbands (channels), the start time of the multiple transmissions or single transmissions of the LBT is the same. For example, the time when the resource selection is completed is the starting time when LBT is performed for all subbands.

Alternatively, in step 822, the first UE performs LBT after selecting the resources, and if multiple transmissions or a single transmission are located in different LBT subbands (channels), the start times of LBTs of the multiple subbands may be different. For example, different start times are determined based on the locations of the different transmissions.

And step 830, executing a first type channel access process corresponding to each channel according to the second start time and the first channel access process initialization value.

In the invention, the LBT mechanism of the multi-sub-band of the through link is defined by the steps 810 to 830, so that the interference to other systems working in the unlicensed frequency band is reduced.

Specifically, step 830 includes:

step 831, the first type channel access process is an independent access process, and when the detection result of the channel detection time slot or interval of any channel is idle at the same time, the initialization value of the first channel access process corresponding to the channel is iterated and counted down with the down-count step size;

In this embodiment, if each LBT sub-band (channel) independently executes the Type1 channel access procedure, when the detection result of the channel detection time slot/interval of any sub-band is idle, the initialization value N of the Type1 channel access corresponding to the channel is iteratively counted down by the count-down step size, that is, it is determined that N of the corresponding sub-band can be decremented by 1.

Or, in step 832, the first type of channel access procedure is a joint access procedure, and when the detection results of the channel detection time slots or intervals of all the channels are idle, the initialization values of the first channel access procedure corresponding to all the channels are iteratively counted down with the count-down step size.

In this embodiment, if the Type1 channel access process of the multiple LBT subbands (channels) is a joint access process, if only the detection results of the channel detection time slots/intervals of all the subbands are idle, the initialization values N of the Type1 channel access processes corresponding to all the channels are iteratively counted down with a count-down step size, that is, it is determined that N of all the subbands is decremented by 1.

Optionally, in step 830, a first type channel access procedure corresponding to each channel is performed, and further includes:

the first terminal performs channel detection on a plurality of channels according to channel detection time slots or intervals, and when the channel detection result of at least one channel is idle, the first channel access process initialization values corresponding to all channels are iteratively counted down by a count-down step size;

And when the initialization value is reduced to zero, the first channel access process is successfully accessed.

Optionally, the method further comprises:

after the first terminal is successfully accessed in the first channel access process, the second type channel access process or the channel access process with specific length is required to be executed before the corresponding resource of the first channel access process is sent.

It should be noted that, the specific time length herein includes at least one channel detection time slot or interval. The channel access procedure for a certain length of time here may also be a second type of channel access procedure.

It should also be noted that the present invention defines two types of Type2 channel access process execution cases, one is: the first terminal performs channel detection on a plurality of channels according to channel detection time slots or intervals, and after any channel is successful, the initialization value of the access process is iteratively counted down by the size of the counting down step, namely the execution condition of the Type2 channel access process can be additionally executed before data transmission begins; another case is: and when the Type1 channel access process is successful, executing the Type2 channel access process again to be successful.

In the prior art, if LBT is performed for a certain transmission and the transmission occupies a plurality of LBT subbands (channels), but the end times of the plurality of LBT subbands (channels) are not necessarily identical, it is not defined in the prior art when to transmit COT sharing information in this case.

The invention also defines a COT sharing mechanism of multiple LBT sub-bands (channels) for the case that the transmission occupies multiple LBT sub-bands (channels).

Specifically, in the present invention, the first terminal executes a multi-channel access process, and the method further includes:

step 910, the first COT shared information of each channel is sent separately; the first COT sharing information includes COT sharing information corresponding to one channel.

In this embodiment, each LBT sub-band (channel) performs independent COT sharing, that is, any sub-band transmits information related to COT sharing of the corresponding sub-band after LBT is successful, and the COT sharing information only includes COT information of a single LBT sub-band (channel).

Or, step 920, jointly transmitting second COT shared information of the plurality of channels; the second COT sharing information includes COT sharing information corresponding to a plurality of channels.

In this embodiment, the plurality of sub-bands perform joint COT sharing, that is, COT sharing information is sent after all sub-bands have been LBT successful, and the COT sharing information includes COT information of the plurality of sub-bands.

As shown in fig. 4, fig. 4 shows a channel access mechanism of a multi-LBT sub-band (channel). In a third embodiment, the transmission resource of the first UE occupies a plurality of LBT subbands (channels), and before channel access, two independent N values, the initialization N of "channel 1" is equal to 5 and the initialization value n=7 of "channel 2", are determined for two LBT subbands according to the channel access priority, respectively. As shown in fig. 4, the start times of LBT performed by two LBT subbands are the same, then energy detection is performed respectively, and it is determined whether the two LBT subbands are idle, and if idle, the N value of the corresponding LBT subband is reduced by one until N equals to 0, which indicates that channel access is successful, but because the channel occupation conditions are different, the end times of channel access of the two LBT subbands are different.

It should be understood that the "channel 1" may carry the COT sharing information by means of a MAC CE (link access control layer control unit) after the channel access is successful, that is, immediately after the LBT of the "channel 1" is successful, the COT sharing information of the corresponding sub-band is shared to other UEs. In addition, the first UE may wait until both LBT subbands are successfully accessed and simultaneously use the MAC CE to carry the COT shared information, and when there is Data transmission, multiplex the COT shared information and the Data information together to transmit to other UEs.

It should be further noted that, in another embodiment, the present invention also specifies the end time of Type1 channel access.

Specifically, after the first terminal fails to perform the first type channel access process, the method further includes:

step 1110, continuing to perform a first type channel access procedure; or,

step 1120, terminating execution of the first type channel access procedure.

In the invention, the first UE is accessed to the Type1 channel executed for a certain transmission, but before the transmission, the Type1 channel access is unsuccessful, and the first UE can continue to execute the Type1 channel access or terminate the Type1 channel access process.

In the unlicensed spectrum, the terminal device needs to contend for the channel through the channel access procedure. If the first terminal fails to perform the first type channel access procedure, the first terminal may continue to perform the first type channel access procedure until the channel access procedure is completed, so as to reduce the influence on the service transmission of the terminal device; of course, if the channel condition of the first terminal is poor, the channel access procedure may not be completed all the time, and at this time, the execution of the first type channel access procedure is terminated through step 1120, which reduces the disadvantage that the terminal consumes a large amount of resources.

Specifically, step 1110 is performed when the following conditions are satisfied: subsequent retransmission of the same transport block TB and transmission resources corresponding to the execution of the first type channel access procedure are located in the same channel;

specifically, step 1120 is performed when the following conditions are satisfied: the subsequent retransmission of the same TB and the transmission corresponding to the first type channel access process are located in different channels, or the transmission corresponding to the first type channel access process is the last transmission of the current TB, or the HARQ feedback is successful, including acknowledgement ACK request or negative acknowledgement NACK request.

In summary, the present invention defines a multi-subband channel access mechanism (or called multi-channel access mechanism) and a COT sharing processing mechanism; the influence and the solution of the half duplex problem on the channel access process are clarified; the condition that the time difference of the Type2 channel access mechanism can be met before the service transmission after the Type1 channel access mechanism is executed is limited; the relation between the resource selection time and the channel access starting time is defined; the invention perfects the direct link channel access processing flow, ensures that the direct link is kept occupied continuously when the channel is accessed, and reduces the interference to other systems working in unauthorized frequency bands.

As shown in fig. 5, the embodiment of the present invention further provides a channel access processing method applied to a through link, which is executed by a second terminal, where the method includes:

step 1200, determining COT sharing information sent by a first terminal;

step 1300, determining, according to the COT sharing information, that the second terminal performs a second type channel access procedure.

In this embodiment, the method is suitable for distributed resource scheduling, and the second UE, that is, the UE at the receiving end, determines whether the second UE can execute the Type 2 channel access process through the COT sharing information, so as to avoid interference between different systems.

Optionally, step 1300 includes:

step 1310, determining a COT duration according to the COT sharing information;

step 1320, when the transmission duration of the second terminal is less than or equal to the COT duration, determining that the second terminal performs the second type channel access procedure.

In this embodiment, if the transmission mode of the COT shared information is unicast, it is required to determine whether the sum of the transmission durations of the second UE is less than or equal to the COT duration, where the transmission duration includes: and determining that the second UE can execute a Type 2 channel access process for the transmission within the COT duration.

Optionally, step 1300 further includes:

step 1330, determining a COT termination time according to the COT sharing information;

step 1340, determining that the second terminal performs the second type channel access procedure when the transmission time of the second terminal is at or before the COT termination time.

In this embodiment, if the transmission mode of the COT shared information is multicast or broadcast, when the sending time of the second terminal is at or before the COT termination time, that is, includes the COT termination time, that is, before the COT termination time or the termination time, it is determined that the second UE may execute the Type 2 channel access procedure.

In addition, the invention can also increase the limiting conditions: when the second UE uses the COT shared information to perform transmission, it needs to be ensured that the second UE sends the corresponding target receiving user to include the first UE, where the first UE refers to the UE that sends the COT information.

The present invention further illustrates step 1300 described above with respect to a fourth embodiment.

For example, assume that a first UE is a UE transmitting COT sharing information, and a second UE is a UE receiving and using the COT sharing information. After the first UE completes the Type1 channel access procedure, the determined COT duration is 6 slots, and then the COT sharing information is shared to the second UE, where the COT sharing information includes: the start time of COT is 100 and the duration is 6 slots. If the COT information sent by the first UE to the second UE is unicast, the sending time of the second UE is 102/104/106/107, the unit is slots, and the sending time of the second UE is 4 slots.

Here, it is only necessary to determine that the transmission time of the second UE is less than the COT duration determined by the first UE, that is, the 4slot is less than 6 slots, so that the second UE may perform the Type2 channel access procedure before each transmission.

If the first UE shares the COT shared information for multicast or broadcast, the COT shared information at least includes: COT start time was 100; COT termination time 100+5, and the like, and the second UE determines that the sending time is 102/104/106/107 respectively, wherein the second UE determines that only 102/104 is between 100 and 105, so that Type2 channel access can be performed only before two transmissions corresponding to 102/104 time slots, and determines start time and/or deadline in this way, and considers that the Type2 channel access cannot be performed beyond the deadline.

It should be noted that the start time may be a relative value, i.e., a time offset value with respect to a certain reference point.

As shown in fig. 6, the embodiment of the present invention further provides a channel access processing apparatus applied to a through link, which is executed by a first terminal, and the apparatus includes:

a first determining module 10, configured to determine a single channel and/or multi-channel access parameter of a first terminal;

a second determining module 20, configured to determine that the first terminal performs a single-channel and/or multi-channel access procedure according to the channel access parameter.

In an embodiment of the present invention, the apparatus further includes:

a fifth determining module, configured to determine and share channel occupation time COT sharing information by using the first terminal; the COT sharing information at least includes at least one of:

the COT start time, the COT time interval, the COT end time, the remaining COT time, the priority, the channel access priority, the time occupied by the first terminal's own transmission, the second terminal's identification ID.

In an embodiment of the present invention, the apparatus further includes:

a sixth determining module, configured to determine a channel occupancy state of the first transmission period, including at least one of:

the channel occupation state of the first sending time period is an idle state;

Optionally, the sixth determining module is specifically configured to: when the channel occupation state of the first transmission time period is the occupied state, continuing to execute the first type channel access process after the first transmission time period, and determining that the value of the counter maintains the value before the first transmission time period;

And when the channel occupation state of the first transmission time period is an idle state, iteratively counting down the counter according to the channel monitoring time unit in the first transmission time period.

In an embodiment of the present invention, the apparatus further includes:

the first processing module is used for determining the channel occupation state of the second transmission time period by the first terminal;

the second processing module is used for judging whether the second type channel access process is successful or not according to the channel occupation state of the second transmission time period;

In an embodiment of the present invention, the apparatus further includes:

the third processing module is used for switching and executing the channel access process with a specific time length before transmission if the time difference is smaller than or equal to the configured or preconfigured preset time threshold value;

And the fourth processing module is used for re-executing the first type channel access process before transmission by the first terminal if the time difference is larger than a configured or preconfigured preset time threshold value.

In an embodiment of the present invention, the apparatus further includes:

a seventh determining module, configured to determine a first start time for executing a first type channel access procedure, where the first start time is a service packet arrival time or a first start time, and the first start time is located before the service packet arrival time.

Optionally, the seventh determining module includes:

a first determining unit, configured to determine the first starting time according to at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

It should be noted that, the channel access priority is a configured or preconfigured value, or is obtained according to a service transmitted in history.

Optionally, the seventh determining module further includes:

a second determining unit, configured to determine a resource selection time as a sum of the service packet arrival time and a first time interval;

wherein the first time interval is a configured or preconfigured value or is determined according to at least one of the following: channel access priority, minimum channel access duration, priority, channel access procedure initialization value N.

Optionally, the second determining module 20 includes:

a third determining unit configured to determine a first channel access procedure initialization value for each channel to perform a first type channel access procedure;

a fourth determining unit configured to determine a second start time at which each channel performs the first type channel access procedure;

and the first processing unit is used for executing a first type channel access process corresponding to each channel according to the second starting time and the first channel access process initialization value.

Optionally, the third determining unit includes:

a first determining subunit, configured to obtain a second channel access priority of the first terminal, determine that a contention window value of the first terminal is a value that is randomly selected from a set of allowed contention window sizes for each channel, and use the value as a first channel access procedure initialization value corresponding to each channel;

or, a first determining subunit, configured to randomly select a value from the set of allowed contention window sizes, as a first channel access procedure initialization value corresponding to each channel;

or, a third determining subunit, configured to randomly select, for each channel, a value from the set of allowed contention window sizes, and use the maximum value or the minimum value thereof as the first channel access procedure initialization value corresponding to each channel.

Optionally, the first processing unit includes:

a first processing subunit, configured to, when the first type channel access process is an independent access process and the detection results of the channel detection time slots or intervals of any channel are simultaneously idle, initialize a value of the first channel access process corresponding to the channel to iterate and count down with a count down step size; or,

and the second processing subunit is used for performing the first channel access process as a joint access process, and when the detection results of the channel detection time slots or intervals of all the channels are idle, the initialization values of the first channel access processes corresponding to all the channels are iterated and counted down by the down counting step size.

Optionally, the first processing unit further includes:

a third processing subunit, configured to perform channel detection on multiple channels according to channel detection timeslots or intervals at the same time by using the first terminal, and iterate and count down the first channel access procedure initialization values corresponding to all channels by using a count down step size when the channel detection result of at least one channel is idle;

and the fourth processing subunit is used for successfully accessing the first channel access process when the initialization value is reduced to zero.

Optionally, the first processing unit further includes:

and the fifth processing subunit is used for executing a second type channel access process or a channel access process with a specific length before the transmission of the corresponding resource in the first channel access process after the first terminal is successfully accessed in the first channel access process.

In an embodiment of the present invention, the apparatus further includes:

a fifth processing module, configured to send the first COT sharing information of each channel separately; the first COT sharing information comprises COT sharing information corresponding to a channel; or,

a sixth processing module, configured to jointly transmit second COT shared information of the plurality of channels; the second COT sharing information includes COT sharing information corresponding to a plurality of channels.

In an embodiment of the present invention, the apparatus further includes:

a seventh processing module, configured to continue to perform a first type channel access procedure; or,

and the eighth processing module is used for terminating the execution of the first type channel access process.

It should be noted that, when the following conditions are satisfied, the seventh processing module is specifically configured to continue to execute the first type channel access procedure: subsequent retransmission of the same transport block TB and transmission resources corresponding to the execution of the first type channel access procedure are located in the same channel;

The eighth processing module is specifically configured to terminate execution of the first type channel access procedure when the following condition is satisfied: the subsequent retransmission of the same TB and the transmission resource corresponding to the first type channel access process are located in different channels, or the transmission corresponding to the first type channel access process is the last transmission of the current TB, or the HARQ feedback is successful, including acknowledgement ACK request or negative acknowledgement NACK request.

As shown in fig. 7, the embodiment of the present invention further provides a channel access processing apparatus applied to a through link, which is executed by a second terminal, and the apparatus includes:

In an embodiment of the present invention, the fourth determining module includes:

a third determining unit, configured to determine a COT duration according to the COT sharing information;

and the second processing unit is used for determining that the second terminal executes the second type channel access process when the sending time of the second terminal is smaller than or equal to the COT duration.

In an embodiment of the present invention, the fourth determining module further includes:

a fourth determining unit, configured to determine a COT termination time according to the COT sharing information;

and the third processing unit is used for determining that the second terminal executes the second type channel access process when the sending moment of the second terminal is before the COT termination time.

The embodiments of the channel access processing method applied to the through link are applicable to the embodiments of the channel access processing device applied to the through link, and the same technical effects can be achieved.

The embodiment of the invention also provides user equipment, which comprises: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the processor, when executing the program or instructions, implements a channel access processing method applied to a through link as set forth in any one of the above.

A user equipment according to another embodiment of the present invention, as shown in fig. 8, includes a transceiver 1410, a processor 1400, a memory 1420, and a program or instructions stored on the memory 1420 and executable on the processor 1400; the processor 1400, when executing the programs or instructions, implements the channel access processing method described above as being applied to the through link.

The transceiver 1410 is configured to receive and transmit data under the control of the processor 1400.

Wherein in fig. 8, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by the processor 1400 and various circuits of the memory represented by the memory 1420, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 1410 may be a number of elements, i.e., include a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The user interface 1430 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1420 may store data used by the processor 1400 in performing operations.

The readable storage medium of the embodiment of the present invention stores a program or an instruction, which when executed by a processor, implements the steps of the channel access processing method applied to the through link as described above, and can achieve the same technical effects, and is not described herein again for avoiding repetition.

The processor is a processor in the channel access processing method applied to the through link 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.

It is further noted that the terminals described in this specification include, but are not limited to, smartphones, tablets, etc., and that many of the functional components described are referred to as modules in order to more particularly emphasize their implementation independence.

In an embodiment of the invention, the modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be organized as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices.

Where a module may be implemented in software, taking into account the level of existing hardware technology, a module may be implemented in software, and one skilled in the art may, without regard to cost, build corresponding hardware circuitry, including conventional Very Large Scale Integration (VLSI) circuits or gate arrays, and existing semiconductors such as logic chips, transistors, or other discrete components, to achieve the corresponding functions. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

The exemplary embodiments described above are described with reference to the drawings, many different forms and embodiments are possible without departing from the spirit and teachings of the present invention, and therefore, the present invention should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will convey the scope of the invention to those skilled in the art. In the drawings, the size of the elements and relative sizes may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values includes the upper and lower limits of the range and any subranges therebetween.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. A channel access processing method applied to a through link, performed by a first terminal, the method comprising:

2. The method of claim 1, wherein the first terminal, after performing the channel access procedure, further comprises:

the first terminal determines and shares COT sharing information; the COT sharing information at least includes at least one of:

3. The method of claim 1, wherein when the channel access procedure is a first type of channel access procedure, the method further comprises:

Determining a channel occupancy state for a first transmission period, comprising at least one of:

the channel occupation state of the first sending time period is an idle state;

4. The method of claim 3, wherein when the channel occupancy state for the first transmission period is an occupied state, continuing to perform the first type channel access procedure after the first transmission period, and determining that the value of the counter maintains the value prior to the first transmission period;

5. The method of claim 1, wherein when the channel access procedure is a second type of channel access procedure, the method further comprises:

the first terminal determines the channel occupation state of a second transmission time period;

Judging whether a second type channel access process is successful or not according to the channel occupation state of the second transmission time period;

6. The method of claim 1, wherein during the channel access procedure, if there is a time difference between the time when the first type of channel access procedure is performed and the actual transmission, the method further comprises:

if the time difference is smaller than or equal to a preset time threshold value which is configured or preconfigured, switching and executing a channel access process with a specific time length before transmission;

and if the time difference is larger than a preset time threshold value which is configured or preconfigured, the first terminal re-executes the first type channel access process before transmission.

7. The method according to claim 1, wherein the method further comprises:

A first start time for performing a first type of channel access procedure is determined, the first start time being a service packet arrival time or a first start time, the first start time being before the service packet arrival time.

8. The method of claim 7, wherein in the case where the first start time is a first start time, the method further comprises:

9. The method of claim 8, wherein the channel access priority is a configured or pre-configured value or is obtained from historically transmitted traffic.

10. The method of claim 7, wherein in the case where the first start time is a service packet arrival time, the method further comprises:

11. The method of claim 1, wherein the first terminal performs a multi-channel access procedure comprising:

determining a first channel access procedure initialization value for each channel to perform a first type of channel access procedure;

determining a second start time for each channel to perform a first type of channel access procedure;

and executing a first type channel access process corresponding to each channel according to the second starting time and the first channel access process initialization value.

12. The method of claim 11, wherein determining a first channel access procedure initialization value for each channel to perform a first type of channel access procedure comprises:

acquiring a second channel access priority of a first terminal, determining a contention window value of the first terminal as a value randomly selected from a set of allowed contention window sizes for each channel respectively, and taking the value as a first channel access process initialization value corresponding to each channel; or,

randomly selecting a numerical value from the allowed set of the contention window sizes as a first channel access procedure initialization value corresponding to each channel; or,

and randomly selecting a numerical value from the set of allowed contention window sizes for each channel, and taking the maximum value or the minimum value of the numerical value as a first channel access process initialization value corresponding to each channel.

13. The method of claim 11, wherein performing a first type of channel access procedure for each channel comprises:

the first type channel access process is an independent access process, and when the detection result of the channel detection time slot or interval of any channel is idle at the same time, the initialization value of the first channel access process corresponding to the channel is iteratively counted down with the size of the countdown step; or,

and when the detection results of the channel detection time slots or intervals of all the channels are idle, the initialization values of the first channel access processes corresponding to all the channels are iteratively counted down by the down-counting step size.

14. The method of claim 11, wherein performing a first type of channel access procedure for each channel comprises:

15. The method of claim 14, the method further comprising:

16. The method of claim 1, wherein the first terminal performs a multi-channel access procedure, the method further comprising:

transmitting first COT sharing information of each channel separately; the first COT sharing information comprises COT sharing information corresponding to a channel; or,

jointly transmitting second COT shared information of a plurality of channels; the second COT sharing information includes COT sharing information corresponding to a plurality of channels.

17. The method of claim 1, wherein after the first terminal fails to perform the first type of channel access procedure, the method further comprises:

continuing to execute the first type channel access process; or,

the execution of the first type of channel access procedure is terminated.

18. The method of claim 17, wherein the step of determining the position of the probe is performed,

continuing to perform the first type of channel access procedure when the following condition is satisfied: subsequent retransmission of the same transport block TB and transmission resources corresponding to the execution of the first type channel access procedure are located in the same channel;

Terminating execution of the first type of channel access procedure when the following condition is satisfied: the subsequent retransmission of the same TB and the transmission resource corresponding to the first type channel access process are located in different channels, or the transmission corresponding to the first type channel access process is the last transmission of the current TB, or the HARQ feedback is successful, including acknowledgement ACK request or negative acknowledgement NACK request.

19. A channel access processing method applied to a through link, performed by a second terminal, the method comprising:

determining COT sharing information sent by a first terminal;

20. The method of claim 19, wherein determining that the second terminal performs the second type of channel access procedure based on the COT sharing information comprises:

determining COT duration according to the COT sharing information;

and when the sending duration of the second terminal is smaller than or equal to the COT duration, determining that the second terminal executes a second type channel access process.

21. The method of claim 19, wherein determining that the second terminal performs the second type of channel access procedure based on the COT sharing information further comprises:

Determining COT termination time according to the COT sharing information;

and when the sending time of the second terminal is at or before the COT termination time, determining that the second terminal executes a second type channel access process.

22. A channel access handling apparatus for a through link, performed by a first terminal, the apparatus comprising:

23. A channel access handling apparatus for a through link, performed by a second terminal, the apparatus comprising:

and the fourth determining module is used for determining that the first terminal executes the second type channel access process according to the COT sharing information.

24. A user equipment, comprising: a transceiver, a processor, a memory, and a program or instructions stored on the memory and executable on the processor; the method according to any one of claims 1 to 18, wherein the processor, when executing the program or instructions, implements the method according to any one of claims 19 to 21.

25. A readable storage medium having stored thereon a program or instructions, which when executed by a processor, implements the channel access processing method for a through link according to any one of claims 1 to 18, or which when executed implements the channel access processing method for a through link according to any one of claims 19 to 21.