CN117580186A - Channel access method, device and terminal - Google Patents
Channel access method, device and terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a channel access method, a device and a terminal, and relates to the technical field of communication. The channel access method comprises the following steps: determining transmission resources of data to be transmitted; and performing through link channel access on a target time unit before the transmission resource. The scheme of the invention can execute the direct link channel access on the target time unit before the transmission resource, ensure the data to be transmitted on the transmission resource and avoid packet loss.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a terminal for channel access.
Background
The existing sidelink mode-2 resource allocation method is based on a mode that a terminal autonomously selects transmission resources, namely, a direct link (sidelink) terminal performs resource reservation according to a sensing result, and can ensure that transmission is completed on reserved resources without worrying about occupation of channels by other technologies. However, for the unlicensed band, the UE needs to complete channel access by listen before talk (listen before talk, LBT) mechanism before transmission, if the channel access fails, the terminal cannot transmit on the reserved resource, so that packet loss or delay transmission occurs, resulting in reduced transmission reliability or increased delay.
Disclosure of Invention
The embodiment of the invention provides a channel access method, a device and a terminal, which are used for solving the problems that the terminal cannot transmit data on transmission resources and packet loss or delay transmission occurs in the conventional sidelink mode-2 resource allocation method.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
the embodiment of the invention provides a channel monitoring method, which is applied to a first terminal and comprises the following steps:
determining transmission resources of data to be transmitted;
and performing through link channel access on a target time unit before the transmission resource.
The embodiment of the invention also provides a channel monitoring device, which is applied to the first terminal, and comprises:
a determining module, configured to determine a transmission resource of data to be transmitted;
and the access module is used for executing the direct link channel access on a target time unit before the transmission resource.
The embodiment of the invention also provides a terminal, which comprises: 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 the steps in the channel access method as described above.
The embodiments of the present invention also provide a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps in a channel access method as described above.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the invention, the transmission resource of the data to be transmitted is determined, and the direct link channel access is executed on the target time unit before the transmission resource, so that the first terminal is ensured to be capable of transmitting the data to be transmitted on the transmission resource, the packet loss is avoided, the transmission reliability is improved, and the time delay is reduced.
Drawings
FIG. 1 shows a schematic diagram of a perceived window and a resource selection window of a sidelink mode-2 resource allocation;
fig. 2 shows a flow chart of a channel access method provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of performing channel listening according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a second embodiment of the present invention for performing channel listening;
FIG. 5 is a third schematic diagram illustrating channel listening according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a fourth embodiment of the present invention for performing channel listening;
FIG. 7 is a schematic diagram of performing channel listening according to an embodiment of the present invention;
Fig. 8 shows one of schematic diagrams for performing through link channel access according to an embodiment of the present invention;
FIG. 9 is a second schematic diagram of performing through link channel access according to an embodiment of the present invention;
fig. 10 is a schematic diagram of determining whether a through link channel is available according to an embodiment of the present invention;
fig. 11 is a schematic diagram of transmission resource reselection provided in an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a channel access device according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a terminal 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.
Before proceeding with the description of the specific embodiments of the present invention, the following description is first made.
1. Method for distributing sidelink mode-2 resource
The sidelink mode-2 resource allocation aims to support the enhanced application requirements which cannot be supported by Rel-15 long term evolution Internet of things (Long Term Evolution Vehicle to Everything, LTE-V2X), a distributed resource scheduling mode (namely, UE autonomously selects transmission resources) is adopted, and as no base station is used for uniform scheduling, the UE needs to determine the resource occupation condition of other UEs through a sensing mechanism and performs resource selection according to a sensing result. The resource selection flow of the sidelink mode-2 is as follows:
(a) Candidate single-slot resource R x,y Is [ n+T ] 1 ,n+T 2 ]T is within time t y Consecutive x + j sub-channels on slot. Referring to FIG. 1, FIG. 1 is a schematic diagram of a perception window and a resource selection window of a sidelink mode-2 resource allocation, as shown in FIG. 1, wherein 0.ltoreq.T 1 ≤T proc,1 ，T proc,1 Representing UE transmission processing delays (including perceived-based resource selection time, transmission preparation time of physical through link control channel (Physical SideLink Control Channel, PSCCH), and physical through link shared channel (Physical SideLink Shared Ch)an antenna, PSSCH) may be {3,5,9, 17} physical time slots, corresponding to sub-carrier space, SCS) {15, 30, 60, 120} kHz, T, respectively 2min ≤T 2 ≤remaining PDB，T 2min T configured for high-level parameter t2min_SelectionWindow 2 The minimum value, remaining PDB, is the packet residual delay budget, where the packet delay budget (packet delay budget, PDB). The total number of candidate single slot resources is M total 。
(b) UE continuously monitors the sensing window [ n-T ] 0 ,n-T proc,0 ) And (c) intra slots, performing physical through link control channel (Physical SideLink Control Channel, PSCCH) transcoding, PSCCH decoding, and pscsch or physical through link control channel reference signal received power (PSCCH Reference Signal Received Power, PSCCH-RSRP) measurements. T (T) 0 Perceived window length, T, for higher layer configuration proc,0 The time of the sensing result before the UE processes can be {1, 2,4} physical slots, which correspond to SCS {15, 30, 60, 120} kHz respectively.
(c)Th(p i ,p j ) Indicating the i-th RSRP domain in sl-threspsch-RSRP-List-r 16, i=p i +(p j -1)*8，p i Indicating the priority indicated in the received through link control information (Sidelink Control Information, SCI), p j Indicating priority of sending UE transmissions, p j ＝prio TX 。
(d) Initializing S A Is a set of all candidate single slot resources.
(e) Candidate slots corresponding to skip slots (skip slots) are excluded, the skip slots are slots (such as y) which cannot be sent due to half duplex influence, and for all periods (such as 20ms,50ms and 100 ms) of system configuration, all candidate slots (such as y, y+20×2) of subsequent corresponding positions are excluded μ ，y+40*2 μ ，y+50*2 μ ，y+60*2 μ ，y+80*2 μ ，y+100*2 μ …, etc., slots that fall within the selection window).
(f) The candidate single slot resources meeting the following two conditions are excluded: RSRP measured value received by SCI is higher than Thprio RX ,prio TX ) The method comprises the steps of carrying out a first treatment on the surface of the The reserved resource that receives the SCI indication will be associated with a Transport Block (TB) sent on the candidate resource y or with a subsequent y+x P step *2 μ TB of candidate resource transmission on the same is partially overlapped or fully overlapped, P step Is the period of traffic generation in ms, x is an integer representing the subsequent number of periods, μ being uniquely determined by the subcarrier spacing (SCS) of the resource pool, see in particular table 1 below.
Table 1 parameter table of system configuration
(g) If S A The remaining resources in (a) are less than X.times.M total Then Th (p) i ,p j ) Lifting by 3dB and returning to step (d); for a given prio TX X is defined by the higher layer parameter sl-xPercentiage (prio) TX ) And (5) configuration.
(h) UE reporting S A To higher layers.
(i) The higher layer is under the constraint of satisfying the Round Trip Time (RTT) of the hybrid automatic repeat request (Hybrid automatic repeat request, HARQ), at S A The primary transmission and retransmission resources are randomly selected for the current TB.
2. Unlicensed frequency bands: unlicensed spectrum can be tried out without application, and can be used by any group or individual, for example, the common technologies of WiFI (wireless network communication technology), bluetooth and the like are 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 systems are monitored to be available.
3. LBT mechanism.
The terminal working in the unlicensed frequency band needs to detect the channel before the channel is accessed, and only when the channel is detected to be available, the terminal can access the channel to transmit the service to be transmitted. The channel detection mode comprises the following steps:
(1) Type 1 channel access:
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 in an additional sending slot, and executing Step 4 if the additional sending slot is idle; otherwise, step 5 is performed.
Step 4: if n=0, ending the channel access procedure; otherwise, step 2 is performed.
Step 5: the channel is detected until one sensing slot is detected to be busy for an additional back-off time Td, or all sensing slots for the additional back-off time Td are idle.
Step 6: if all the sending slots in the Td are idle, executing Step 4; otherwise, step 5 is performed.
Td is defined by Tf=16us and m immediately follows p A consecutive sending slot, and Tf includes an idle sending slot at the beginning of Tf.
CW min,p ≤CW p ≤CW max,p Is a contention window, CW min,p And CW max,p Selecting m before step 1 p ,CW min,p And CW max,p Based on the channel access priority p related to the base station transmission, the base station must not exceed the channel occupation time T mcot,p Is transmitted on the channel of (a). The channel access priority classes are shown in table 2 below:
table 2 channel access priority 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 maximum channel occupation time, and CW p May be referred to as a set of allowed contention window sizes.
(2) Type 2 channel access:
type 2A channel access applies only to the following transmissions performed by the base station:
transmissions initiated by the base station, including discovery burst, excluding PDSCH (physical downlink shared channel), and having a transmission duration of up to 1ms;
transmission initiated by a base station with discovery burst multiplexing of only discovery burst or non-unicast information, and a duty cycle of a transmission duration of at most 1ms,discovery burst of at most 1/20;
the transmission of the base station is 25us after the transmission occupied by the UE on the shared channel.
The Type 2B or Type 2C channel access applies to the transmissions of the base station after 16us or at most 16us of the transmissions occupied by the terminal shared channel, respectively.
Wherein, type 2A channel access:
the base station can idle at least one T in the sense channel short_dl Downlink transmission is sent immediately after =25 us. T (T) short_dl From T f =16us and 1 immediately following serving slot composition, and T f Comprising a T-shaped part f Is a starting send slot of (c). If T is detected short_dl Is idle, then the channel is considered to be for T short_dl Is idle.
Type 2B channel access:
the base station can idle for one T in the sense channel f Immediately after=16us, the downlink transmission is sent. T (T) f Comprising a T-shaped part f The last 9us of sending slot. If the channel is perceived to be idle for at least 5us and at least 4us is within the serving slot, then the channel is considered to be in duration T f The inner is idle.
Type 2C channel access:
the base station does not perform channel sensing before downlink transmission, and the time of downlink transmission is 584us at maximum.
In addition, if the base station shares the channel occupation initiated by the terminal using the channel occupation program, the base station may transmit after the terminal scheduling the resource is transmitted, or may transmit after one interval of the terminal PUSCH (physical uplink shared channel) transmitting the configured resource, specifically as follows:
the transmission shall include a transmission to the terminal that originated the channel occupancy and may include non-unicast and/or unicast transmissions, wherein any unicast transmission including user plane data is transmitted only to the terminal that originated the channel occupancy;
If the interval is 25us or 16us, the base station may transmit after performing Type 2A or Type 2B channel access;
if the interval is less than 16us, the base station may transmit after performing Type 2C channel access;
and initiating a transmission by adopting a Type 1 channel access mode for the base station and sharing a corresponding channel occupation with the UE, wherein if any interval between any two transmissions in the channel occupation of the base station is not more than 25us, the base station can transmit after the UE transmits in the channel occupation. In this case:
if the interval is 25us or 16us, the base station may transmit after the Type 2A or Type 2B channel access is performed.
As shown in fig. 2, an embodiment of the present invention provides a channel access method, which is applied to a first terminal, and includes the following steps:
step 201: and determining transmission resources of the data to be transmitted.
In this step, the first terminal may obtain a decoding result of SCI (through link control information) and/or a measurement result of RSRP (reference signal received power) by receiving in the through link unlicensed band, and select a transmission resource for the current data to be transmitted at a resource selection time or a resource reselection time.
Step 202: and performing through link channel access on a target time unit before the transmission resource.
In the step, the first terminal executes a direct link channel access process before data transmission to be transmitted is carried out on a transmission resource. The through link channel access mode includes a Type 1 channel access mode and/or a Type 2 channel access mode.
According to the embodiment of the invention, the transmission resource of the data to be transmitted is determined, and the direct link channel access is executed on the target time unit before the transmission resource, so that the first terminal can transmit the data to be transmitted on the transmission resource, the occurrence of packet loss is avoided, the transmission reliability is improved, and the time delay is reduced.
As an implementation manner of the embodiment of the present invention, in an embodiment of the present invention, step 202 includes:
and executing channel monitoring on the target time unit, obtaining a channel monitoring result, and judging whether the through link channel is available according to the channel monitoring result.
It should be noted that, the first terminal performs channel monitoring on the target time unit to obtain a channel monitoring result, if the through link channel is judged to be available according to the channel monitoring result, then the through link channel is judged to be successfully accessed, otherwise, the through link channel is judged to be unsuccessfully accessed.
In an embodiment of the present invention, when the first terminal performs channel monitoring on the target time unit to obtain a channel monitoring result, two preconditions may be considered: determining that a second terminal transmits a direct link channel according to a decoding result of the SCI and/or a measuring result of the RSRP; and secondly, determining that the condition that the second terminal transmits on the direct link channel does not exist according to the decoding result of the SCI and/or the measuring result of the RSRP.
In the first case, in the case that it is determined that the through link channel exists for the second terminal to transmit according to the decoding result of the SCI and/or the measurement result of the RSRP, performing channel listening on the target time unit, and obtaining the channel listening result may include at least one implementation manner of the following:
(1) Performing channel monitoring on a target sensing time unit in the target time unit, and determining that the channel monitoring result is idle for the target sensing time unit, wherein the target sensing time unit is any sensing time unit in the target time unit;
(2) Performing channel monitoring on the next first time unit of the target time unit to obtain the channel monitoring result;
(3) And obtaining the channel monitoring result on a second time unit in the sensing time units in the target time unit according to the detection energy value and/or the channel occupation energy value of the second time unit.
The applicant describes the above three implementations separately.
In the implementation manner (1), channel monitoring is performed on a target sensing time unit in the target time unit, the channel monitoring result is determined to be idle for the target sensing time unit, and the target sensing time unit is any sensing time unit in the target time unit.
If the second terminal performs the through link transmission on the target time unit before the transmission resource is determined according to the decoding result of the SCI and/or the measurement result of the RSRP, the first terminal determines that the target sensing time unit is idle for the target sensing time unit in the target time unit no matter whether the channel detection result indicates that the target sensing time unit is idle or not in order to avoid the influence of the second terminal on the first terminal to perform the through link channel access. Here, the second terminal is a terminal other than the first terminal.
As shown in fig. 3, the target time unit is any first time unit before the transmission resource, taking granularity of the first time unit as a time slot, the target time unit as slot 1, and the transmission resource as slot 4 as an example.
The first terminal executes channel monitoring at the starting moment of the slot 1, and determines that a second terminal performs direct link transmission on the slot 1 according to the decoding result of the SCI, then for any sensing time unit in the slot 1, the first terminal directly determines that the sensing time unit is idle, and reduces the counter value by 1, before the slot 1 is ended, if the counter value N is reduced to 0, then it is determined that the Type 1 channel is successfully accessed, and the first terminal can perform data transmission on the slot 4. Before slot 1 ends, if the counter value N is not reduced to 0, the first terminal continues to perform channel listening.
And (2) implementing channel monitoring on the next first time unit of the target time unit to obtain the channel monitoring result.
If the second terminal performs the through link transmission on the target time unit before the transmission resource is determined according to the decoding result of the SCI and/or the measuring result of the RSRP, the first terminal skips the target time unit and performs channel monitoring on the next first time unit of the target time unit in order to avoid the influence of the second terminal on the first terminal in performing the through link channel access and simplify the judgment on whether the through link channel is available; or the first terminal does not judge whether the through link channel is available according to the channel monitoring result of the target time unit.
As shown in fig. 4, the target time unit is any first time unit before the transmission resource, taking granularity of the first time unit as a time slot, the target time unit as slot1, and the transmission resource as slot 4 as an example.
The first terminal determines that a second terminal performs direct link transmission on slot1 according to the decoding result of SCI, skips slot1, and performs direct link channel monitoring on slot 2; or the first terminal does not judge whether the direct link channel is available according to the channel monitoring result of slot 1.
And (3) obtaining the channel monitoring result according to the detection energy value and/or the channel occupation energy value of a second time unit in the sensing time units in the target time unit.
If the second terminal performs the through link transmission on the target time unit before the transmission resource is determined according to the decoding result of the SCI and/or the measuring result of the RSRP, in order to avoid the influence of the second terminal on the first terminal in executing the through link channel access, and accurately obtain the occupation condition of the second terminal on the through link channel, namely, the channel occupation energy value, and obtain the channel monitoring result according to the detected energy value and/or the channel occupation energy value.
And secondly, when the fact that the direct link channel does not have the second terminal for transmission is determined according to the decoding result of the SCI and/or the measuring result of the RSRP, channel monitoring is carried out on the target time unit, and the implementation mode for obtaining the channel monitoring result can be directly adopted by the existing channel access method. For example, taking the example shown in fig. 3 as an example, if it is determined that no second terminal performs the through link transmission on slot 2 according to the decoding result of SCI and/or the measurement result of RSRP, the first terminal executes Type 1 channel access for any one of the perceived time units on slot 2.
In another embodiment of the present invention, another implementation method for performing channel listening on the target time unit to obtain a channel listening result is provided, which may include:
and determining the starting time and/or monitoring duration of executing channel monitoring according to the GP (guard interval) symbol in the target time unit, and starting to execute channel monitoring at the starting time to obtain the channel monitoring result.
Note that, in the case where the first terminal performs the Type 2 channel access method, since the through link transmission is not performed in the GP symbol, the first terminal performs channel listening in the GP symbol of the first time unit before the transmission resource.
Further, the determining, according to the GP symbol in the target time unit, a starting time and/or a listening duration of performing channel listening includes:
if the length of the GP symbol is greater than or equal to a first sensing interval, determining that the starting moment is positioned at the starting position of the GP symbol and/or determining that the monitoring time is greater than or equal to the first sensing interval, wherein the first sensing interval comprises a first number of sensing time units;
if the length of the GP symbol is greater than or equal to a second sensing interval, determining that the starting time is located after the starting position of the GP symbol and/or determining that the listening time is greater than or equal to the second sensing interval, where the second sensing interval includes a second number of sensing time units;
Wherein the first number and the second number are both positive integers, and the first number is greater than the second number.
As shown in fig. 5, if the length of the GP symbol is greater than or equal to the first sensing interval T short_sl Illustratively, the GP symbol has a length equal to T short_sl The first terminal can execute the channel access mode of Type 2A, at this time, it is determined that the starting time of the first terminal executing channel monitoring is located at the starting position of the GP symbol, and it is determined that the monitoring duration T is greater than or equal to T short_sl The method comprises the steps of carrying out a first treatment on the surface of the Wherein the first sensing interval may comprise a first number of sensing time units T sl Illustratively, the first sensing interval includes 2 sensing time units T sl 。
As shown in fig. 6, if the length of the GP symbol is greater than or equal to the second sensing interval T f Illustratively, the GP symbol has a length greater than T f The first terminal may execute the channel access mode of Type 2B, where it is determined that the starting time of the first terminal executing channel listening is located after the starting position of the GP symbol, and it is determined that the listening duration T is greater than or equal to T f The method comprises the steps of carrying out a first treatment on the surface of the Wherein the first sensing interval may comprise a second number of sensing time units T sl Illustratively, the second sensing interval includes 1 sensing time unit T sl 。
As another implementation manner of the embodiment of the present invention, step 202 includes:
and not performing the channel listening on the target time unit.
The first terminal does not perform channel monitoring on the target time unit and directly accesses the through link channel. That is, the first terminal may directly execute the Type2C channel access mode under the condition that the Type2C channel access and transmission conditions are satisfied, and transmit the data to be transmitted on the transmission resource after executing the Type2C channel access.
In a specific embodiment of the present invention, the performing the channel listening on the target time unit includes:
if the length of the GP symbol in the target time unit is smaller than the second sensing interval, not executing the channel monitoring on the target time unit;
wherein the second sensing interval comprises a second number of sensing time units, the second number being a positive integer.
As shown in fig. 7, if the length of the GP symbol is smaller than the second sensing interval T f And the first terminal can only execute the Type2C channel access mode, and does not execute the channel monitoring on the target time unit, namely the monitoring duration T is 0, and the direct link channel is directly accessed.
In an embodiment of the present invention, the timing for performing channel listening is at least one of the following:
after obtaining the decoding result of SCI and/or the measuring result of RSRP;
at the start of the next first time unit.
That is, the starting time of the target time unit is determined as the time after the decoding result of the SCI and/or the measurement result of the RSRP is acquired and/or the starting time of the next first time unit, and then channel listening is performed on the target time unit.
In a specific embodiment of the present invention, the target time unit is any one of the first time units before the transmission resource or is the first one of the first time units before the transmission resource.
It should be noted that, for the Type 1 channel access manner, the target time unit is generally any first time unit before the transmission resource; for the Type 2 channel access mode, the target time unit is typically the first time unit before the transmission resource.
The granularity of the first time unit is one of the following:
a sub-frame;
time slots;
a symbol;
second, wherein the second is;
a millisecond;
microsecond.
Optionally, for the Type 1 channel access manner, the granularity of the first time unit may be:
Removing subframes of the GP symbol;
removing the time slot of the GP symbol;
removing the subframe of the time unit where the SCI is located;
the time slot of the time unit in which the SCI is located is removed.
Taking the granularity of the first time unit as the slot from which the GP symbol is removed as an example, as shown in fig. 8, the hatched area in the figure indicates the GP symbol, the first terminal only removes the portion of the GP symbol in each slot, that is, performs the through link channel access in the blank area in fig. 8.
Taking the granularity of the first time unit as the time slot of the time unit with the SCI removed as an example, as shown in fig. 9, the hatched area in the figure indicates the SCI, the first terminal only removes the part of the time unit with the SCI in each time slot, that is, performs the through link channel access in the vertical area in fig. 9.
The granularity of the second time unit may also be one of the granularities of the first time unit, but the granularity of the first time unit is larger than the granularity of the sensing time unit, and the sensing time unit comprises at least one second time unit, so that it is required to ensure that the granularity of the second time unit is smaller than the granularity of the first time unit.
In a specific embodiment of the present invention, the obtaining, at a second time unit in the sensing time units in the target time unit, the channel monitoring result according to the detected energy value and/or the channel occupied energy value of the second time unit includes:
Acquiring a channel occupation energy value of the second time unit according to the RSRP measurement result and the conversion factor; or alternatively
Acquiring a channel occupation energy value of the second time unit according to the measuring result of the RSRP, the Fourier transform size of the third time unit, the cyclic prefix length and the number of the second time units included in the third time unit;
determining a channel energy value of the second time unit according to the detected energy value and the channel occupation energy value of the second time unit;
under the condition that channel energy values of at least K second time units in the sensing time units are smaller than an energy threshold value, obtaining the channel monitoring result to be idle of the sensing time units, wherein K is a positive integer;
wherein the RSRP is measured in granularity of a third time unit, and the third time unit includes at least one second time unit.
The first terminal uses the detected energy value X of the second time unit meas Subtracting the channel occupancy energy value X converted from the RSRP measurement sl Obtaining the channel energy value X of the second time unit others To the channel energy value X others And an energy detection threshold X Thresh Comparison was performed. If there are at least K X of the second time units within a sensing time unit others Less than X Thresh And if not, the sensing time unit is considered to be busy.
The measurement granularity of the RSRP is a third time unit.
The third time unit may be a subframe, a slot, a symbol, a second, a millisecond, a microsecond, etc., and includes at least one second time unit.
Further, the channel occupancy energy value X sl The calculation formula of (2) can be:
wherein, RSRP represents the measuring result of RSRP of the third time unit where the second time unit is located; FFTsize is the fourier transform size of the third time unit; CPlength is the cyclic prefix length; timeength is the number of second time units comprised by the third time unit.
Alternatively, the channel occupancy energy value X sl The calculation formula of (2) can also be:
X sl ＝RSRP*scale
the RSRP is a measurement result of the RSRP of the third time unit where the second time unit is located, and scale is a conversion factor.
Thereby calculating the channel energy value as: x is X others ＝X meas -X sl 。
In an embodiment of the present invention, it is determined whether the through link channel is available according to at least one of:
the channel monitors the result;
a counter value;
And channel monitoring results of a second time unit in the sensing time units in the target time unit, wherein the sensing time unit comprises at least one second time unit.
And judging whether the direct link channel is available according to the channel monitoring result and the counter value, if so, judging that the direct link channel is successfully accessed, otherwise, judging that the direct link channel is failed to be accessed.
And the first terminal determines that the sensing time unit is idle according to the channel monitoring result, and judges that the channel access is successful if the counter value is 0. Illustratively, the counter value N is adjusted as follows:
step 1: setting n=ninit, wherein the value of Ninit is related to channel access priority and jumps to Step 4;
step 2: if N >0 and the first terminal chooses to decrement the counter, setting n=n-1;
step 3: detecting a channel in an extra sensing time unit, if the extra sensing time unit is idle, jumping to Step 4, otherwise jumping to Step 5;
step 4: if n=0, stopping, and judging whether the through link channel is available; otherwise, jumping to Step2;
step 5: at an additional back-off time T d Internal detection letterLanes until a busy perceived time unit is detected, or an additional backoff time T d All the sensing time units in the buffer are idle;
step 6: if T d All the sensing time unit channels in the channel are idle, and the channel jumps to Step 4; otherwise, jumping to Step 5; the T is d Comprising at least 1 sensing time unit.
In addition, according to the channel monitoring result of the second time unit in the sensing time unit in the target time unit, judging whether the through link channel is available or not includes:
if the detection energy values of at least P second time units in the sensing time units are determined to be smaller than an energy threshold according to the channel monitoring result, judging that the sensing time units are idle, wherein P is a positive integer;
and if N perception time units are idle in M perception time units in the target time unit according to the channel monitoring result, judging that the direct link channel is available, wherein M and N are positive integers, and N is smaller than or equal to M.
It should be noted that, if the first terminal executes the Type 2 channel access mode:
for any perceived time unit mε M within the target time unit, if there are at least P second time units whose detected energy values are less than the energy threshold X Thresh The perceived time unit is considered to be idle, wherein P is a positive integer;
and if at least N sensing time units in the M sensing time units are idle, considering that the through link channel is available, wherein N is a positive integer less than or equal to M.
In addition, if the first terminal performs Type 2B channel access:
for any perceived time unit N e N within the target time unit, if there are at least P detected energy values for the second time unit that are less than the energy threshold X Thresh The perceived time unit is considered to be idle, wherein P is a positive integer;
and if the first terminal detects that at least N idle time units exist in the M sensing time units, the through link channel is considered to be available, wherein N is a positive integer less than or equal to M.
If the first terminal executes the Type2C channel access mode:
if the first terminal satisfies the conditions of Type2C channel access and transmission, transmission may be performed directly on the transmission resource after the Type2C channel access is performed.
Exemplary, as shown in fig. 10, the Type 2A channel access is performed with the first terminal, T sl For example, 9 μs, k=4 μs, m=n=2. In the first sensing time unit, the detected energy value of 4 mu s is smaller than the energy threshold X Thresh The first perceived time unit is therefore idle; in the second sensing time unit, the detected energy value of 5 mu s is smaller than the energy threshold X Thresh The second perceived time unit is therefore idle and thus it can be decided that the direct link channel is available, i.e. that the channel access is successful.
In an embodiment of the present invention, if there is a time interval between the time when the through link channel is successfully accessed and the transmission resource, the method further includes one of the following steps:
transmitting a placeholder prior to the transmission resource;
performing a through link channel access prior to the transmission resource;
and sending the time interval to the second terminal.
It should be noted that, whether the first terminal adopts the Type 1 channel access mode, the Type 2 channel access mode, or the channel access mode combining the two, if it is determined that the channel access is successful before the transmission of the resource, the first terminal may transmit on the transmission resource. If it is determined that there is a time interval between the time when the channel access is successful and the transmission resource, the first terminal may perform one of the following:
transmitting placeholders before transmission resources until transmission is completed on the transmission resources;
Executing Type 2 channel access before transmitting the resource, and transmitting on the transmission resource after the Type 2 channel access is successful;
the time interval between the time when the channel access is successful and the transmission resource is sent to the third terminal, and the first terminal transmits data to be transmitted on the transmission resource; wherein the third terminal is at least one terminal other than the first terminal in the same system.
Illustratively, as shown in fig. 3, to ensure that the first terminal may perform a through link transmission on slot 4, the first terminal may perform one of the following:
transmitting a placeholder before slot 4 until transmission is completed on slot 4;
executing Type 2 channel access before slot 4, and transmitting on slot 4 after the Type 2 channel access is successful;
and sharing the slot 2 and the slot 3 to transmit to the third terminal, and transmitting the first terminal on the slot 4.
In a specific embodiment of the present invention, in the case of determining that the through link channel is unavailable according to the channel monitoring result, the method further includes one of the following steps:
discarding transmission of the data to be transmitted on the transmission resource;
determining a resource reselection time according to the transmission resources, and selecting a target transmission resource for the data to be transmitted according to the decoding result and/or the measurement result at the resource reselection time; wherein the target transmission resource is related to the number of transmissions.
It should be noted that, if the first terminal determines that the through link channel is unavailable, that is, determines that the channel access fails, to ensure fairness of transmission, the first terminal cannot perform transmission of data to be transmitted on a transmission resource, and performs one of the following:
the first terminal gives up the transmission;
if the transmission is the ith transmission of the data to be transmitted but not the last transmission, the first terminal does not perform the ith transmission and continues to perform the direct link channel access for the (i+1) th transmission before the (i+1) th transmission;
if the transmission is the last transmission of the data to be transmitted, the first terminal does not transmit the transmission, and the first terminal selects the target transmission resource for the transmission again;
the first terminal sets the time of the transmission resource as the resource reselection time, and reselects the target transmission resource for the transmission according to the decoding of the SCI and/or the measurement result of the RSRP, or reselects the target transmission resource for the transmission and the transmission which is not performed subsequently.
As shown in fig. 11, slot 1 is a transmission resource selected by the first terminal for the first transmission, slot 4 is a transmission resource selected by the first terminal for the second transmission, but if the channel access of the first terminal fails before slot 1, the first terminal gives up the first transmission and continues to perform the channel access for the second transmission before the second transmission.
In summary, the channel access method of the embodiment of the invention can avoid the influence of the direct link channel access of the first terminal by the second terminal of the same system, avoid packet loss, improve the reliability of service transmission, reduce time delay, and is particularly suitable for the direct link channel access working in an unauthorized frequency band.
As shown in fig. 12, the embodiment of the present invention further provides a channel access device, where the device includes:
a determining module 1201, configured to determine transmission resources of data to be transmitted;
and the execution module is used for executing the direct link channel access on a target time unit before the transmission resource.
According to the embodiment of the invention, the transmission resource of the data to be transmitted is determined, the direct link channel access is executed on the target time unit before the transmission resource, so that the first terminal is ensured to transmit the data to be transmitted on the transmission resource, the occurrence of packet loss is avoided, the transmission reliability is improved, and the time delay is reduced.
Optionally, the executing module 1202 includes:
and the first sub-module is used for executing channel monitoring on the target time unit, obtaining a channel monitoring result and judging whether the through link channel is available according to the channel monitoring result.
Optionally, the first sub-module specifically includes at least one of the following:
the first determining unit is used for executing channel monitoring on a target sensing time unit in the target time unit, determining that the channel monitoring result is that the target sensing time unit is idle, and the target sensing time unit is any sensing time unit in the target time unit;
a first obtaining unit, configured to perform channel monitoring on a first time unit next to the target time unit, to obtain the channel monitoring result;
the second obtaining unit is configured to obtain, on a second time unit in the sensing time units in the target time unit, the channel monitoring result according to the detected energy value and/or the channel occupation energy value of the second time unit.
Optionally, the first sub-module is specifically configured to:
the second determining unit is used for determining the starting time and/or the monitoring duration of executing channel monitoring according to the guard interval GP symbol in the target time unit, and starting to execute channel monitoring at the starting time to obtain the channel monitoring result;
optionally, the timing of performing channel listening is at least one of:
After obtaining the decoding result of SCI and/or the measuring result of RSRP;
at the start of the next first time unit.
Optionally, the target time unit is any one of the first time units before the transmission resource or is the first one of the first time units before the transmission resource.
Optionally, the granularity of the first time unit is one of the following: subframes, slots, symbols, seconds, milliseconds, microseconds.
Optionally, the second obtaining unit includes:
an obtaining subunit, configured to convert according to the measurement result of RSRP, and obtain a channel occupation energy value of the second time unit;
a determining subunit, configured to determine a channel energy value of the second time unit according to the detected energy value and/or the channel occupation energy value of the second time unit;
the obtaining subunit is configured to obtain the channel monitoring result when the sensing time unit is idle and K is a positive integer, where the channel energy value of at least K second time units in the sensing time unit is smaller than an energy threshold;
wherein the RSRP is measured in granularity of a third time unit, and the third time unit includes at least one second time unit.
Optionally, the acquiring subunit is specifically configured to:
acquiring a channel occupation energy value of the second time unit according to the RSRP measurement result and the conversion factor; or alternatively
And acquiring a channel occupation energy value of the second time unit according to the measuring result of the RSRP, the Fourier transform size of the third time unit, the cyclic prefix length and the number of the second time units included in the third time unit.
Optionally, the second determining unit is specifically configured to:
if the length of the GP symbol is greater than or equal to a first sensing interval, determining that the starting moment is positioned at the starting position of the GP symbol and/or determining that the monitoring time is greater than or equal to the first sensing interval, wherein the first sensing interval comprises a first number of sensing time units;
if the length of the GP symbol is greater than or equal to a second sensing interval, determining that the starting time is located after the starting position of the GP symbol and/or determining that the listening time is greater than or equal to the second sensing interval, where the second sensing interval includes a second number of sensing time units;
wherein the first number and the second number are both positive integers, and the first number is greater than the second number.
Optionally, the executing module 1202 includes:
and the second sub-module is used for not executing the channel monitoring on the target time unit.
Optionally, the second sub-module is specifically configured to:
if the length of the GP symbol in the target time unit is smaller than the second sensing interval, not executing the channel monitoring on the target time unit;
wherein the second sensing interval comprises a second number of sensing time units, the second number being a positive integer.
Optionally, the first sub-module is specifically configured to:
determining whether the through link channel is available based on at least one of:
the channel monitors the result;
a counter value;
and channel monitoring results of a second time unit in the sensing time units in the target time unit, wherein the sensing time unit comprises at least one second time unit.
Optionally, the apparatus further includes a first module configured to perform one of:
transmitting a placeholder prior to the transmission resource;
performing a through link channel access prior to the transmission resource;
and sending the time interval to the second terminal.
Optionally, the apparatus further includes a second module configured to perform one of:
Discarding transmission of the data to be transmitted on the transmission resource;
determining a resource reselection time according to the transmission resources, and selecting a target transmission resource for the data to be transmitted according to the decoding result and/or the measurement result at the resource reselection time; wherein the target transmission resource is related to the number of transmissions.
It should be noted that, the channel access device provided in the embodiment of the present invention is a device capable of executing the above-mentioned channel access method, and all embodiments of the above-mentioned resource selection method are applicable to the device, and can achieve the same or similar technical effects.
As shown in fig. 13, an embodiment of the present invention further provides a terminal, including: processor 1300; and a memory 1310 connected to the processor 1300 through a bus interface, the memory 1310 storing programs and data used by the processor 1300 when executing operations, the processor 1300 calling and executing the programs and data stored in the memory 1310.
Wherein the terminal further comprises a transceiver 1320, the transceiver 1320 being connected to a bus interface for receiving and transmitting data under the control of the processor 1300;
Specifically, the processor 1300 performs the following process:
determining transmission resources of data to be transmitted;
and performing through link channel access on a target time unit before the transmission resource.
Optionally, the processor 1300 is specifically configured to:
and executing channel monitoring on the target time unit, obtaining a channel monitoring result, and judging whether the through link channel is available according to the channel monitoring result.
Optionally, the processor 1300 is specifically configured to:
performing channel monitoring on a target sensing time unit in the target time unit, and determining that the channel monitoring result is idle for the target sensing time unit, wherein the target sensing time unit is any sensing time unit in the target time unit;
performing channel monitoring on the next first time unit of the target time unit to obtain the channel monitoring result;
and obtaining the channel monitoring result on a second time unit in the sensing time units in the target time unit according to the detection energy value and/or the channel occupation energy value of the second time unit.
Optionally, the processor 1300 is specifically configured to:
And determining the starting time and/or monitoring duration of executing channel monitoring according to the guard interval GP symbol in the target time unit, and starting executing channel monitoring at the starting time to obtain the channel monitoring result.
The target time unit is either the first time unit before the transmission resource or the first time unit before the transmission resource.
Optionally, the timing of performing channel listening is at least one of:
after obtaining the decoding result of SCI and/or the measuring result of RSRP;
at the start of the next first time unit.
Optionally, the granularity of the first time unit is one of the following: subframes, slots, symbols, seconds, milliseconds, microseconds.
Optionally, the processor 1300 is specifically configured to:
according to the RSRP measurement result, converting to obtain the channel occupation energy value of the second time unit;
determining the channel energy value of the second time unit according to the detected energy value and/or the channel occupation energy value of the second time unit;
under the condition that channel energy values of at least K second time units in the sensing time units are smaller than an energy threshold value, obtaining the channel monitoring result to be idle of the sensing time units, wherein K is a positive integer;
Wherein the RSRP is measured in granularity of a third time unit, and the third time unit includes at least one second time unit.
Optionally, the processor 1300 is specifically configured to:
acquiring a channel occupation energy value of the second time unit according to the RSRP measurement result and the conversion factor; or alternatively
And acquiring a channel occupation energy value of the second time unit according to the measuring result of the RSRP, the Fourier transform size of the third time unit, the cyclic prefix length and the number of the second time units included in the third time unit.
Optionally, the processor 1300 is specifically configured to:
if the length of the GP symbol is greater than or equal to a first sensing interval, determining that the starting moment is positioned at the starting position of the GP symbol and/or determining that the monitoring time is greater than or equal to the first sensing interval, wherein the first sensing interval comprises a first number of sensing time units;
if the length of the GP symbol is greater than or equal to a second sensing interval, determining that the starting time is located after the starting position of the GP symbol and/or determining that the listening time is greater than or equal to the second sensing interval, where the second sensing interval includes a second number of sensing time units;
Wherein the first number and the second number are both positive integers, and the first number is greater than the second number.
Optionally, the processor 1300 is specifically configured to:
and not performing the channel listening on the target time unit.
Optionally, the processor 1300 is specifically configured to:
if the length of the GP symbol in the target time unit is smaller than the second sensing interval, not executing the channel monitoring on the target time unit;
wherein the second sensing interval comprises a second number of sensing time units, the second number being a positive integer.
Optionally, the processor 1300 is specifically configured to:
determining whether the through link channel is available based on at least one of:
the channel monitors the result;
a counter value;
and channel monitoring results of a second time unit in the sensing time units in the target time unit, wherein the sensing time unit comprises at least one second time unit.
Optionally, the processor 1300 is specifically configured to:
if there is a time interval between the time when the through link channel access is successful and the transmission resource, the method further includes one of the following:
Transmitting a placeholder prior to the transmission resource;
performing a through link channel access prior to the transmission resource;
and sending the time interval to the second terminal.
Optionally, the processor 1300 is specifically configured to:
discarding transmission of the data to be transmitted on the transmission resource;
determining a resource reselection time according to the transmission resources, and selecting a target transmission resource for the data to be transmitted according to the decoding result and/or the measurement result at the resource reselection time; wherein the target transmission resource is related to the number of transmissions.
Where in FIG. 13, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, specifically represented by processor 1300, and the memory, represented by memory 1310, being 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 a user interface 1330. The transceiver 1320 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1310 may store data used by the processor 1300 in performing operations.
In addition, a specific embodiment of the present invention also provides a readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the steps of the channel access method as described in any of the above.
In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the resource selection method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
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 changes can be made without departing from the principles of the present invention, and such modifications and changes are intended to be within the scope of the present invention.
Claims (18)
1. A channel access method, applied to a first terminal, the method comprising:
determining transmission resources of data to be transmitted;
and performing through link channel access on a target time unit before the transmission resource.
2. The channel access method according to claim 1, wherein said performing through link channel access on a target time unit preceding said transmission resource comprises:
and executing channel monitoring on the target time unit, obtaining a channel monitoring result, and judging whether the through link channel is available according to the channel monitoring result.
3. The channel access method according to claim 2, characterized in that in case it is determined that the through link channel is present for transmission by the second terminal based on the decoding result of the through link control information SCI and/or the measurement result of the reference signal received power RSRP, said performing channel listening on said target time unit, obtaining a channel listening result, comprises at least one of the following:
performing channel monitoring on a target sensing time unit in the target time unit, and determining that the channel monitoring result is idle for the target sensing time unit, wherein the target sensing time unit is any sensing time unit in the target time unit;
performing channel monitoring on the next first time unit of the target time unit to obtain the channel monitoring result;
And obtaining the channel monitoring result on a second time unit in the sensing time units in the target time unit according to the detection energy value and/or the channel occupation energy value of the second time unit.
4. The method for channel access according to claim 2, wherein said performing channel listening on said target time unit to obtain a channel listening result comprises:
and determining the starting time and/or monitoring duration of executing channel monitoring according to the guard interval GP symbol in the target time unit, and starting executing channel monitoring at the starting time to obtain the channel monitoring result.
5. A channel access method according to claim 3, characterized in that the timing of performing channel listening is at least one of:
after obtaining the decoding result of SCI and/or the measuring result of RSRP;
at the start of the next first time unit.
6. The channel access method of claim 1, wherein the target time unit is any one of a first time unit before the transmission resource or a first time unit before the transmission resource.
7. The channel access method of claim 6, wherein the granularity of the first time unit is one of:
A sub-frame;
time slots;
a symbol;
second, wherein the second is;
a millisecond;
microsecond.
8. A channel access method according to claim 3, wherein said obtaining, at a second time unit of said perceived time units within said target time unit, said channel listening result based on a detected energy value and/or a channel occupancy energy value of said second time unit comprises:
according to the RSRP measurement result, converting to obtain the channel occupation energy value of the second time unit;
determining the channel energy value of the second time unit according to the detected energy value and/or the channel occupation energy value of the second time unit;
under the condition that channel energy values of at least K second time units in the sensing time units are smaller than an energy threshold value, obtaining the channel monitoring result to be idle of the sensing time units, wherein K is a positive integer;
wherein the RSRP is measured in granularity of a third time unit, and the third time unit includes at least one second time unit.
9. The method for channel access according to claim 8, wherein said converting according to the RSRP measurement result to obtain the channel occupation energy value of the second time unit includes:
Acquiring a channel occupation energy value of the second time unit according to the RSRP measurement result and the conversion factor; or alternatively
And acquiring a channel occupation energy value of the second time unit according to the measuring result of the RSRP, the Fourier transform size of the third time unit, the cyclic prefix length and the number of the second time units included in the third time unit.
10. The method according to claim 4, wherein the determining the starting time and/or the listening duration of performing channel listening according to the guard interval GP symbol in the target time unit includes:
if the length of the GP symbol is greater than or equal to a first sensing interval, determining that the starting moment is positioned at the starting position of the GP symbol and/or determining that the monitoring time is greater than or equal to the first sensing interval, wherein the first sensing interval comprises a first number of sensing time units;
if the length of the GP symbol is greater than or equal to a second sensing interval, determining that the starting time is located after the starting position of the GP symbol and/or determining that the listening time is greater than or equal to the second sensing interval, where the second sensing interval includes a second number of sensing time units;
Wherein the first number and the second number are both positive integers, and the first number is greater than the second number.
11. The channel access method according to claim 1, wherein said performing through link channel access on a target time unit preceding said transmission resource comprises:
and not performing the channel listening on the target time unit.
12. The channel access method of claim 11, wherein the performing no channel listening on the target time unit comprises:
if the length of the GP symbol in the target time unit is smaller than the second sensing interval, not executing the channel monitoring on the target time unit;
wherein the second sensing interval comprises a second number of sensing time units, the second number being a positive integer.
13. The method for accessing a channel according to claim 2, wherein said determining whether the through link channel is available according to the channel listening result comprises:
determining whether the through link channel is available based on at least one of:
the channel monitors the result;
a counter value;
and channel monitoring results of a second time unit in the sensing time units in the target time unit, wherein the sensing time unit comprises at least one second time unit.
14. The channel access method of claim 1, wherein if there is a time interval between the time when the through link channel access is successful and the transmission resource, the method further comprises one of:
transmitting a placeholder prior to the transmission resource;
performing a through link channel access prior to the transmission resource;
and sending the time interval to a third terminal.
15. The channel access method according to claim 2, wherein in case the through link channel is judged to be unavailable according to the channel listening result, the method further comprises one of:
discarding transmission of the data to be transmitted on the transmission resource;
determining a resource reselection time according to the transmission resource, and selecting a target transmission resource for the data to be transmitted according to a decoding result of SCI and/or a measurement result of RSRP at the resource reselection time; wherein the target transmission resource is related to the number of transmissions.
16. A channel access device for use in a first terminal, the device comprising:
a determining module, configured to determine a transmission resource of data to be transmitted;
And the access module is used for executing the direct link channel access on a target time unit before the transmission resource.
17. A terminal, comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the channel access method of any of claims 1 to 15.
18. A readable storage medium, characterized in that the readable storage medium has stored thereon a program which, when executed by a processor, implements the steps of the channel access method according to any of claims 1 to 15.
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