CN110972105A - Communication method, communication device and user equipment - Google Patents
Communication method, communication device and user equipment Download PDFInfo
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- CN110972105A CN110972105A CN201811145887.8A CN201811145887A CN110972105A CN 110972105 A CN110972105 A CN 110972105A CN 201811145887 A CN201811145887 A CN 201811145887A CN 110972105 A CN110972105 A CN 110972105A
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- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The communication method, the communication device and the user equipment are used in a V2X system and comprise the following steps: determining a channel access mechanism to be adopted based on a traffic condition and/or a network configuration, wherein the traffic condition comprises at least one of a traffic type and a data volume, and the network configuration comprises at least one of a resource type, a subcarrier interval and a priority; accessing a channel based on the channel access mechanism; communication is conducted in the channel. In the V2X system under 5G, the LBT mechanism is adopted for aperiodic traffic or data with similar characteristics to the aperiodic traffic, and the specific LBT mechanism is determined based on the traffic condition and/or network configuration, so that the probability of channel/resource occupation collision can be reduced.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a communication method, a communication apparatus, and a user equipment.
Background
V2X (Vehicle to X), i.e. information exchange between the Vehicle and the outside, is the basis of the internet of vehicles, and mainly includes V2V (Vehicle), V2P (Vehicle peer), V2I (Vehicle Infrastructure), and so on.
The V2X system under 5G is currently under design, and no mature channel access/resource allocation scheme has been established, and here we refer to the V2X system under 4G.
(refer to 3GPP TS 38.214) in the LTE V2X system, two resource allocation manners are supported, one is resource allocation by the network, and the other is resource autonomous selection by the terminal. In the method of selecting resources autonomously by the terminal, the terminal selects the resources in a sensing manner to realize channel access and communication. The method specifically comprises the following steps: the terminal predicts the probability that the sub-channels/resources are occupied by other users in the future by analyzing SCI (SidelinkControl Information, SCI containing resource reservation Information) of each sub-channel/resource in the past long time and corresponding RSSI/RSRP measurement, if the probability is high, the sub-channels/resources are excluded, and channels/resources are randomly selected from the rest sub-channels/resources for communication.
The above prior art scheme implements collision reduction/avoidance by means of interference prediction, but it is not suitable for aperiodic services. This is because the resource reservation mechanism in the above prior art scheme does not work well due to the "unpredictable arrival time of data packets" characteristic of aperiodic services, and thus collision reduction/avoidance cannot be achieved for aperiodic services.
In the V2X system under 5G, how to select channels/resources for communication to reduce/avoid collisions for aperiodic traffic in a resource allocation manner in which a terminal autonomously selects resources is a problem to be solved in the art.
In order to solve the above problems, R1-1808696, R1-1809449 and R1-155221 propose to introduce an LBT (listenbeform talk) mechanism, so-called LBT mechanism, that is, before transmission, an energy detection mechanism is used to sense whether a channel/resource is occupied, but no specific scheme is given in the prior art to implement this idea.
Disclosure of Invention
The technical problem solved by the invention is as follows: in the V2X system under 5G, in a resource allocation scheme in which a terminal autonomously selects a resource, how to select a channel/resource for communication.
In order to solve the above technical problem, an embodiment of the present invention provides a communication method, used in a V2X system, including:
determining a channel access mechanism to be adopted based on a traffic condition and/or a network configuration, wherein the traffic condition comprises at least one of a traffic type and a data volume, and the network configuration comprises at least one of a resource type, a subcarrier interval and a priority;
accessing a channel based on the channel access mechanism;
communication is conducted in the channel.
Optionally, if the service type is satisfied as aperiodic service, a channel access mechanism based on LBT is adopted.
Optionally, if the resource type is the exclusively configured resource, a channel access mechanism of LBTcat 1 is adopted.
Optionally, if at least one of the data volume is a small data packet, the service type is a low latency service, or the subcarrier interval is a small subcarrier interval is satisfied, a channel access mechanism of LBTcat2 is adopted.
Optionally, if the service type is at least one of aperiodic service, large data packet, or large subcarrier spacing, a channel access mechanism of LBTcat4 is adopted.
Optionally, when a channel access mechanism of LBTcat4 is used, the size of the contention window is adjusted based on a first parameter and/or a second parameter in a predetermined time period and/or a probability that a received HARQ-ACK replies to NACK, where the first parameter is associated with a proportion of sub-channels or resources in the resource pool, where an RSSI value of the resource pool exceeds a predetermined threshold, and the second parameter is associated with a proportion of allocated and reserved sub-channels or resources in the resource pool.
Optionally, when the first parameter is greater than a predetermined first threshold, the contention window size is increased.
Optionally, when the second parameter is smaller than a predetermined second threshold, the contention window size is increased.
Optionally, when the probability that the received HARQ-ACK replies to NACK exceeds a predetermined third threshold, the size of the contention window is increased.
Optionally, if the transmission collides with another link, the transmission of the other link is abandoned
Optionally, the communication type is broadcast, or multicast, or unicast.
In order to solve the above technical problem, an embodiment of the present invention further provides a communication apparatus, including: the device comprises a mechanism selection unit, a channel access unit and a communication unit; wherein:
the mechanism selecting unit is suitable for determining a channel access mechanism to be adopted in the V2X system based on a traffic condition and/or a network configuration, wherein the traffic condition comprises at least one of a traffic type and a data volume, and the network configuration comprises at least one of a resource type, a subcarrier interval and a priority;
the channel access unit is suitable for accessing a channel based on the channel access mechanism;
the communication unit is adapted to communicate in the channel.
Optionally, if the service type is satisfied as aperiodic service, a channel access mechanism based on LBT is adopted.
Optionally, if the resource type is the exclusively configured resource, a channel access mechanism of LBTcat 1 is adopted.
Optionally, if at least one of the data volume is a small data packet, the service type is a low latency service, or the subcarrier interval is a small subcarrier interval is satisfied, a channel access mechanism of LBTcat2 is adopted.
Optionally, if the service type is at least one of aperiodic service, large data packet, or large subcarrier spacing, a channel access mechanism of LBTcat4 is adopted.
Optionally, when a channel access mechanism of LBTcat4 is used, the size of the contention window is adjusted based on a first parameter and/or a second parameter in a predetermined time period and/or a probability that a received HARQ-ACK replies to NACK, where the first parameter is associated with a proportion of sub-channels or resources in the resource pool, where an RSSI value of the resource pool exceeds a predetermined threshold, and the second parameter is associated with a proportion of allocated and reserved sub-channels or resources in the resource pool.
Optionally, when the first parameter is greater than a predetermined first threshold, the contention window size is increased.
Optionally, when the second parameter is smaller than a predetermined second threshold, the contention window size is increased.
Optionally, when the probability that the received HARQ-ACK replies to NACK exceeds a predetermined third threshold, the size of the contention window is increased.
Optionally, if the transmission collides with other links, the transmission of the other links is abandoned.
Optionally, the communication type is broadcast, or multicast, or unicast.
In order to solve the above technical problem, an embodiment of the present invention further provides a user equipment, where the user equipment supports a V2X system under 5G, and the user equipment includes the communication device as described above.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
in the V2X system under 5G, for aperiodic traffic or data with similar characteristics to aperiodic traffic, an LBT mechanism is adopted, and it is determined which LBT mechanism is specifically adopted based on traffic conditions and/or network configuration, so that the probability of channel/resource occupation collision can be reduced.
Further, when the channel access mechanism of LBTcat4 is adopted, the size of the contention window is adjusted based on the first parameter and/or the second parameter within the predetermined time period and/or the probability that the received HARQ-ACK replies to NACK, thereby determining the manner of performing contention window adjustment in the case of adopting LBTcat 4.
Drawings
FIG. 1 is a flow chart of a communication method according to an embodiment of the present invention;
fig. 2 is a block diagram of a communication device according to an embodiment of the present invention.
Detailed Description
As can be seen from the analysis in the background art section, in the LTE V2X system, under the resource allocation mode in which the terminal autonomously selects resources, the prior art implements collision reduction/avoidance by predicting interference, but this scheme is not suitable for aperiodic services.
Regarding the V2X system under 5G, in a resource allocation manner in which a terminal autonomously selects resources, how to select channels/resources for communication to achieve collision reduction/avoidance for aperiodic traffic, it is proposed to introduce an LBT (stand before talk) mechanism in R1-1808696, R1-1809449, and R1-155221, so-called LBT mechanism, that is, before transmission, an energy detection mechanism is used to achieve whether a sensing channel/resource is occupied, but in the prior art, a specific scheme is not given to achieve this idea (that is, based on R1-1808696, R1-1809449, and R1-155221, it can only know whether a sensing channel/resource is occupied by an energy detection mechanism before transmission).
To this end, the present application provides specific schemes (e.g., how to determine the channel access mechanism to be used, how to adjust the contention window, etc.) for this concept, which can adapt to the "temporary" nature of aperiodic traffic to achieve collision reduction/avoidance (i.e., reduce the probability of channel/resource occupation collisions).
In order that those skilled in the art will better understand and realize the present invention, the following detailed description is given by way of specific embodiments with reference to the accompanying drawings.
Example one
As described below, embodiments of the present invention provide a communication method.
The communication method in this embodiment is mainly used in a V2X system, for example, a V2X system under 5G, and is applicable to all scenarios such as V2V, V2P, and V2I, which is not limited in this respect. The method may be generally performed by a terminal.
Referring to the flow chart of the communication method shown in fig. 1, the following is detailed by specific steps:
s101, determining a channel access mechanism to be adopted based on the traffic condition and/or the network configuration.
The terminal determines the channel access mechanism to employ based on traffic conditions and/or network configuration.
The service status refers to a service type, a data amount, and the like, and the network configuration refers to a resource type, a subcarrier interval, a priority, and the like.
And if the service type is the aperiodic service, adopting a channel access mechanism based on the LBT.
And if the resource type is the exclusively configured resource, adopting a channel access mechanism of LBTcat 1.
If at least one of the data volume is small data packet, the service type is low-delay service, or the subcarrier interval is smaller subcarrier interval is satisfied, the channel access mechanism of LBTcat2 is adopted.
And if the service type is at least one of aperiodic service, the data volume is large data packets or the subcarrier interval is large subcarrier interval, adopting a channel access mechanism of LBTcat 4. The aperiodic service is often characterized by the above-mentioned data amount being a large packet and the subcarrier spacing being a large subcarrier spacing.
The above LBTcat 1, LBTcat2, LBTcat4 refer to 3 of 4 LBT mechanisms, specifically,
LBT is a channel Access mechanism that requires to listen to the channel before transmitting data, perform CCA (clear channel Assessment), and has the following 4 LBT mechanisms (refer to 3GPP TR 36.889 student on allowed-acquired Access to unaccessed Spectrum):
category 1: no LBT, namely, the channel access is directly carried out without monitoring the channel;
category 2: LBT without random backoff LBT;
in cat2, CCA is performed before data transmission is performed, if a channel is idle, data transmission is performed in the following occupied time of the channel, otherwise, data transmission cannot be performed, and the length of time for determining whether a signal is idle before a sender sends data is determined;
category 3: LBT with random back-off with a content window of fixedsize, random back-off LBT of fixed length contention window;
in cat3, in a mode based on load change, the length of a contention window is fixed, and an extended CCA (extended CCA) is adopted, when it is detected that a channel is idle, data transmission can start immediately, otherwise, the contention window is to be entered, that is, a fixed number of extended CCA windows are used;
category 4: LBT with random back-off with a content window of variable size, random backoff LBT of non-fixed length contention window;
in cat4, after detecting that the channel is occupied or the maximum transmission time is reached, the sender may change the length of the contention window, unlike the fixed length contention window employed in cat3 described above.
Herein, the term cat1, cat2, cat3 and cat4 are abbreviated as cat1, cat2, cat3 and cat4, and the term cat1, cat2 and cat4 mentioned earlier in the present invention can be understood as such.
The above description of the technical solution shows that: in this embodiment, in the V2X system under 5G, for aperiodic traffic or data with similar characteristics to the aperiodic traffic, an LBT mechanism is adopted, and which LBT mechanism is specifically adopted is determined based on a traffic condition and/or a network configuration, so that a probability of a channel/resource occupation collision can be reduced.
And S102, accessing a channel based on the channel access mechanism.
After determining the channel access mechanism to be used, the terminal may access the channel based on the channel access mechanism.
And S103, performing communication in the channel.
As mentioned above, in this embodiment, in the case that at least one of the type of the service is aperiodic service, the data amount is large data packet, or the subcarrier spacing is large subcarrier spacing, the channel access mechanism of LBTcat4 is adopted, LBTcat4 is random backoff LBT of non-fixed length contention window, therefore, the present invention further provides a manner of performing contention window adjustment in the case of adopting LBTcat4, specifically, during the communication process, adjusting the contention window size in real time in the following manner,
when the channel access mechanism of LBTcat4 is adopted, the contention window size (size) is adjusted based on a first parameter/a second parameter within a predetermined time period and a probability of a Received HARQ (Hybrid Automatic Repeat reQuest) ACK (ACKnowledgement) reverting to a NACK (Negative ACKnowledgement), wherein the first parameter is associated with a proportion of sub-channels or resources in the resource pool where an RSSI (Received signal strength Indication) value exceeds a predetermined threshold, the second parameter is associated with a proportion of sub-channels or resources in the resource pool that have been allocated and reserved, and the contention window size may be increased in the following cases,
when the first parameter is greater than a predetermined first threshold, the contention window size may be increased;
when the second parameter is less than a predetermined second threshold, the contention window size may be increased;
when the probability that the received HARQ-ACK replies NACK exceeds a predetermined third threshold, the contention window size may be increased;
otherwise, the contention window size may be reduced or kept constant.
As for the first parameter and the second parameter, CBR (Channel Busy rate) and CR (Channel occupancy rate) may be referred to, and have certain similarities, which are not identical.
The above description of the technical solution shows that: in this embodiment, when the channel access mechanism of LBTcat4 is adopted, the size of the contention window is adjusted based on the first parameter and/or the second parameter in the predetermined time period and/or the probability that the received HARQ-ACK replies to NACK, so as to determine a manner of adjusting the contention window under the condition of adopting LBTcat 4.
In a specific embodiment, the terminal traffic type is aperiodic traffic, and the channel access mechanism of LBTcat4 is adopted.
1) If the communication type is a broadcast type, adjusting the size of the contention window based on the first parameter or the second parameter, which may specifically be as follows:
if the measured first parameter is larger than a certain threshold, increasing the size of the contention window, otherwise, resetting the size of the contention window to be the minimum value; or
If the measured second parameter is smaller than a certain threshold, increasing the size of the contention window, otherwise resetting the size of the contention window to the minimum value.
2) If the communication type is a multicast or unicast type, adjusting the size of a contention window based on the first parameter or the second parameter and the HARQ NACK probability:
if the first parameter is smaller than a certain threshold and the NACK probability is smaller than a certain threshold, resetting the size of the contention window to be the minimum value;
if the first parameter is smaller than a certain threshold and the NACK probability is larger than a certain threshold, increasing the size of a contention window;
if the first parameter is greater than a certain threshold, the contention window size is increased.
In another specific embodiment, the terminal traffic type is aperiodic traffic and the channel access mechanism of LBTcat4 is employed.
If the communication type is a broadcast, multicast, or unicast type, the size of the contention window is adjusted based on the first parameter or the second parameter, which may specifically be as follows:
if the measured first parameter is larger than a certain threshold, increasing the size of the contention window, otherwise, resetting the size of the contention window to be the minimum value; or
If the measured second parameter is smaller than a certain threshold, increasing the size of the contention window, otherwise resetting the size of the contention window to the minimum value.
In another specific embodiment, the terminal traffic type is aperiodic traffic and the channel access mechanism of LBTcat4 is employed.
1) If the communication type is a broadcast type, adjusting the size of the contention window based on the first parameter or the second parameter, which may specifically be as follows:
if the measured first parameter is larger than a certain threshold, increasing the size of the contention window, otherwise, resetting the size of the contention window to be the minimum value; or
If the measured second parameter is smaller than a certain threshold, increasing the size of the contention window, otherwise resetting the size of the contention window to the minimum value.
2) If the communication type is multicast or unicast, adjusting the size of a contention window based on the HARQ NACK probability:
if the NACK probability is smaller than a certain threshold, resetting the size of the contention window to be the minimum value;
if the NACK probability is greater than a certain threshold, the contention window size is increased.
In addition, if the transmission collides with another link, the transmission of the other link is abandoned.
Example two
As described below, embodiments of the present invention provide a communication apparatus.
Referring to fig. 2, a block diagram of a communication apparatus is shown.
The communication apparatus includes: a mechanism selecting unit 201, a channel accessing unit 202 and a communication unit 203; the main functions of each unit are as follows:
a mechanism selecting unit 201, adapted to determine a channel access mechanism to be adopted in the V2X system based on a traffic condition and/or a network configuration, wherein the traffic condition includes at least one of a traffic type and a data amount, and the network configuration includes at least one of a resource type, a subcarrier spacing and a priority;
a channel access unit 202 adapted to access a channel based on the channel access mechanism;
a communication unit 203 adapted to communicate in said channel.
In a specific implementation, if the service type is satisfied as aperiodic service, a channel access mechanism based on LBT is adopted.
The above description of the technical solution shows that: in this embodiment, in the V2X system under 5G, for aperiodic traffic or data with similar characteristics to the aperiodic traffic, an LBT mechanism is adopted, and which LBT mechanism is specifically adopted is determined based on a traffic condition and/or a network configuration, so that a probability of a channel/resource occupation collision can be reduced.
In a specific implementation, if the resource type is a resource configured exclusively, a channel access mechanism of LBTcat 1 is adopted.
In a specific implementation, if at least one of the data volume is a small data packet, the service type is a low-latency service, or the subcarrier spacing is a smaller subcarrier spacing is satisfied, a channel access mechanism of LBTcat2 is adopted.
In a specific implementation, if at least one of the service type is aperiodic service, the data volume is large data packets, or the subcarrier spacing is large subcarrier spacing is satisfied, a channel access mechanism of LBTcat4 is adopted.
In a specific implementation, when the channel access mechanism of LBTcat4 is adopted, the size of the contention window is adjusted based on a first parameter and/or a second parameter and/or a probability that a received HARQ-ACK replies to NACK within a predetermined time period, where the first parameter is associated with a proportion of subchannels or resources in the resource pool whose RSSI value exceeds a predetermined threshold, and the second parameter is associated with a proportion of subchannels or resources in the resource pool that have been allocated and reserved.
In a specific implementation, the contention window size is increased when the first parameter is greater than a predetermined first threshold.
In a specific implementation, the contention window size is increased when the second parameter is less than a predetermined second threshold.
In a specific implementation, the contention window size is increased when the probability that the received HARQ-ACK replies to a NACK exceeds a predetermined third threshold.
The above description of the technical solution shows that: in this embodiment, when the channel access mechanism of LBTcat4 is adopted, the size of the contention window is adjusted based on the first parameter and/or the second parameter in the predetermined time period and/or the probability that the received HARQ-ACK replies to NACK, so as to determine a manner of adjusting the contention window under the condition of adopting LBTcat 4.
In implementations, if a transmission collides with another link, the transmission of the other link is dropped.
In a specific implementation, the communication type is broadcast, or multicast, or unicast.
EXAMPLE III
As described below, an embodiment of the present invention provides a user equipment. The user equipment supports the V2X system under 5G. The difference from the prior art is that the user equipment comprises a communication device as provided in the embodiments of the present invention. Therefore, the user equipment can adopt the LBT mechanism for aperiodic traffic or data with similar characteristics to the aperiodic traffic in the V2X system under 5G, and determine which LBT mechanism to specifically adopt based on traffic conditions and/or network configuration, thereby reducing the probability of channel/resource occupation collision.
Those skilled in the art will understand that, in the methods of the embodiments, all or part of the steps can be performed by hardware associated with program instructions, and the program can be stored in a computer-readable storage medium, which can include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (23)
1. A communication method for use in a V2X system, comprising:
determining a channel access mechanism to be adopted based on a traffic condition and/or a network configuration, wherein the traffic condition comprises at least one of a traffic type and a data volume, and the network configuration comprises at least one of a resource type, a subcarrier interval and a priority;
accessing a channel based on the channel access mechanism;
communication is conducted in the channel.
2. The communication method of claim 1, wherein if the traffic type is satisfied as aperiodic traffic, an LBT-based channel access mechanism is employed.
3. The communication method according to claim 1, wherein if the resource type is a exclusively configured resource, a channel access mechanism of LBTcat 1 is adopted.
4. The communication method of claim 1, wherein if at least one of the data amount is a small data packet, the traffic type is low latency traffic, or the subcarrier spacing is small subcarrier spacing is satisfied, a channel access mechanism of LBTcat2 is adopted.
5. The communication method of claim 1, wherein if at least one of the traffic type is aperiodic traffic, the data amount is large packets, or the subcarrier spacing is large subcarrier spacing is satisfied, a channel access mechanism of LBTcat4 is employed.
6. The communication method according to claim 5, wherein when the channel access mechanism of LBTcat4 is adopted, the contention window size is adjusted based on a first parameter and/or a second parameter within a predetermined time period and/or a probability that the received HARQ-ACK reply is NACK, wherein the first parameter is associated with a proportion of sub-channels or resources in the resource pool whose RSSI value exceeds a predetermined threshold, and the second parameter is associated with a proportion of sub-channels or resources in the resource pool that have been allocated and reserved.
7. The communication method of claim 6, wherein a contention window size is increased when the first parameter is greater than a predetermined first threshold.
8. The communication method of claim 6, wherein the contention window size is increased when the second parameter is less than a predetermined second threshold.
9. The communication method of claim 6, wherein the contention window size is increased when the probability that a received HARQ-ACK replies with a NACK exceeds a predetermined third threshold.
10. The communication method of claim 1, wherein if the transmission collides with the other link, the transmission of the other link is abandoned.
11. The communication method according to claim 1, wherein the communication type is broadcast, or multicast, or unicast.
12. A communications apparatus, comprising: the device comprises a mechanism selection unit, a channel access unit and a communication unit; wherein:
the mechanism selecting unit is suitable for determining a channel access mechanism to be adopted in the V2X system based on a traffic condition and/or a network configuration, wherein the traffic condition comprises at least one of a traffic type and a data volume, and the network configuration comprises at least one of a resource type, a subcarrier interval and a priority;
the channel access unit is suitable for accessing a channel based on the channel access mechanism;
the communication unit is adapted to communicate in the channel.
13. The communications apparatus of claim 12, wherein an LBT-based channel access mechanism is employed if the traffic type is satisfied as aperiodic traffic.
14. The communications apparatus of claim 12, wherein a channel access mechanism of LBTcat 1 is employed if the resource type is satisfied as a exclusively configured resource.
15. The communications apparatus of claim 12, wherein a channel access mechanism of LBTcat2 is employed if at least one of the data volume is a small data packet, the traffic type is low latency traffic, or the subcarrier spacing is a small subcarrier spacing is satisfied.
16. The communications apparatus of claim 12, wherein a channel access mechanism of LBTcat4 is employed if at least one of the traffic type is aperiodic traffic, the data volume is large packets, or the subcarrier spacing is large subcarrier spacing is satisfied.
17. The communications apparatus of claim 16, wherein a contention window size is adjusted based on a first parameter and/or a second parameter within a predetermined time period and/or a probability that a received HARQ-ACK replies to a NACK when a channel access mechanism of LBTcat4 is employed, wherein the first parameter is associated with a proportion of subchannels or resources in a resource pool whose RSSI value exceeds a predetermined threshold, and the second parameter is associated with a proportion of subchannels or resources in the resource pool that have been allocated and reserved.
18. The communications apparatus of claim 17, wherein a contention window size is increased when the first parameter is greater than a predetermined first threshold.
19. The communications apparatus of claim 17, wherein a contention window size is increased when the second parameter is less than a predetermined second threshold.
20. The communications apparatus of claim 17, wherein a contention window size is increased when a probability that a received HARQ-ACK replies to a NACK exceeds a predetermined third threshold.
21. The communications apparatus of claim 12, wherein if a transmission collides with other links, transmissions of other links are abandoned.
22. The communications apparatus of claim 12, wherein the communication type is broadcast, or multicast, or unicast.
23. A user equipment supporting a V2X system under 5G, comprising the communication device of any one of claims 12 to 22.
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| WO2021218321A1 (en) * | 2020-04-30 | 2021-11-04 | 华为技术有限公司 | Method for processing data flow and communication apparatus |
| WO2021226760A1 (en) * | 2020-05-09 | 2021-11-18 | 北京小米移动软件有限公司 | Partial sensing method and apparatus, terminal device, and storage medium |
| WO2022073243A1 (en) * | 2020-10-10 | 2022-04-14 | 北京小米移动软件有限公司 | Communication method and apparatus, and user equipment and storage medium |
| WO2022188079A1 (en) * | 2021-03-10 | 2022-09-15 | Oppo广东移动通信有限公司 | Wireless communication method and first device |
| WO2023130469A1 (en) * | 2022-01-10 | 2023-07-13 | 北京小米移动软件有限公司 | Method and apparatus for determining channel access mode, and storage medium |
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