CN113939038A - Wireless channel access method and system of WiFi network and EDCA user node - Google Patents

Wireless channel access method and system of WiFi network and EDCA user node Download PDF

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Publication number
CN113939038A
CN113939038A CN202111272357.1A CN202111272357A CN113939038A CN 113939038 A CN113939038 A CN 113939038A CN 202111272357 A CN202111272357 A CN 202111272357A CN 113939038 A CN113939038 A CN 113939038A
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twt
edca
user node
channel
time
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卢宁宁
熊志广
高杰
张翠平
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CETC 54 Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance

Abstract

The invention discloses a wireless channel access method and system of a WiFi network and an EDCA user node. The WiFi network comprises a WiFi access point, a TWT user node and an EDCA user node. The EDCA user node acquires TWT session information of each TWT user node in a WiFi network notified by a WiFi access point, wherein the TWT session information comprises a TWT session identifier, an occupied channel, a wake-up interval and a start time; adding the TWT session information of each TWT user node in the WiFi network to a TWT state base, and updating the TWT state base in real time; after the first channel use right is obtained, adjusting the EDCA transmission opportunity limited time length of this time according to the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length; and transmitting data on the first channel according to the adjusted EDCA transmission opportunity limited time length. The method avoids the EDCA user node from occupying the channel for too long, so that the TWT user node can obtain the channel use right in time.

Description

Wireless channel access method and system of WiFi network and EDCA user node
Technical Field
The present invention relates to the field of wireless Channel Access, and in particular, to a wireless Channel Access method, a system, and a node device for hybrid networking of a TWT (Target Wake up Time) user node and an EDCA (Enhanced distributed Channel Access) user node in a wifi (wireless fidelity) network.
Background
In order to improve the spectrum utilization efficiency of the WiFi technology in a dense scene, improve the user experience rate, and reduce the power consumption of the user node, the IEEE has set a new generation of wireless local area network standard IEEE 802.11ax, which is named WiFi 6 by the WiFi alliance.
Aiming at different user networking requirements, WiFi 6 formulates different channel access methods, and the method specifically comprises the following steps: (1) for user nodes with low sending rate, periodic networking and low power consumption, a TWT channel access method is designed; (2) for the user nodes with high priority service and requiring differential service, an EDCA channel access method is designed.
Although both TWT and EDCA exhibit better performance when used alone, when both channel access methods are present in a WiFi network, severe collisions may occur, making it difficult for a user node using the TWT channel access technique to obtain a data transmission opportunity and unable to complete a normal data communication task.
Fig. 1 shows a schematic diagram of an operation principle of the TWT channel access method. Wherein, a1 represents a WiFi Access Point (AP), S1 represents a user node (TWT user node for short) adopting a TWT channel Access method, BO (Back Off ) represents a binary exponential backoff policy in CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance), DATA represents a DATA frame transmitted on a wireless channel, and ACK represents an acknowledgement frame. The specific working process of the TWT channel access method is as follows:
1) s1 initiates a TWT signaling interaction procedure, negotiates TWT session (session) parameters with a1, and mainly includes: wake-up time, wake-up interval, active duration, etc.
2) After the TWT signaling interaction procedure is completed, S1 enters a sleep state.
3) When the wake-up time is reached, S1 wakes up from the sleep state and enters the active mode. A1 and S1 start the TWT session: (1) when a1 has a data frame to send to S1, a1 first executes a BO policy, and after confirming that the channel is idle, a1 sends the data frame to S1, and after correctly receiving the data frame, S1 sends an ACK frame to a 1. (2) Similarly, when S1 has a data frame to send to a1, S1 also needs to perform the BO policy first, and after confirming that the channel is idle, S1 sends the data frame to a1, and after correctly receiving the data frame, a1 sends an ACK frame to S1.
4) When the duration of the TWT session exceeds the active duration negotiated by a1 and S1, S1 re-enters the sleep state and starts a timer to wait for the next TWT session.
5) When the timer reaches the negotiated wake-up interval of a1 and S1 at S1, S1 wakes up again from the sleep state, enters the active mode, and starts the TWT session.
6) When the TWT session duration exceeds the active duration, S1 enters the sleep state again, and starts a timer to wait for the next TWT session. And thus periodically cycle back and forth.
As can be seen from fig. 1, after the TWT channel access method is adopted, since the S1 is in the sleep state most of the time, the S1 enters the active mode only for a short time during the TWT session, so that the power consumption of the user node can be greatly reduced.
Fig. 2 shows a schematic diagram of a data transmission flow of an EDCA multi-frame mode. When a user node (EDCA user node for short) adopting an EDCA channel access method exists in a WiFi network, the EDCA user node is allowed to obtain a transmission opportunity (TXOP) due to an EDCA multi-frame mode, and then the transmission opportunity is limited in time length (denoted as T)txop_limitA preset value), a plurality of data frames can be continuously transmitted without re-competing for the channel.
When the TWT user node and the EDCA user node are in mixed networking, the EDCA multi-frame mode of the EDCA user node easily enables the TWT user node to send out data in time due to difficulty in obtaining the channel use right in the transient TWT session process. This is explained in detail below with reference to fig. 3.
Figure 3 shows a schematic diagram of an EDCA user node and a TWT user node in conflict. A1 is a WiFi access point, S1 is a TWT user node, and S2 is an EDCA user node. The TWT session SN1 starts at time t1Ends at time t4And belongs to the node S1.
1) S2 data frame to be transmitted, thus at t0At the time, S2 starts executing the BO operation.
2) At time t1The TWT session SN1 begins and the node S1 wakes up from a sleep state and enters an active mode. To transmit the data frame, S1 starts to execute the BO policy.
3) At time t2And S2 obtains the channel use right to start transmitting the data frame.
4) Because the S2 adopts the EDCA channel access method, when the channel occupation time is less than Ttxop_limitAnd when the ACK frame sent by A1 can be always received, S2 can always send data to A1 without re-competing for the channel use right, so S2 can always occupy the channel until the time t5＝t2+Ttxop_limitUntil now.
5) From time t2To begin, S1 detects that the channel is busy, the BO process pauses, waits for the channel to be idle, but until the end time t of the TWT session SN14The channel is always busy, and S1 goes to sleep if it is not time to transmit data.
As can be seen from fig. 3, when the TWT user node and the EDCA user node are in hybrid networking, in an extreme case, even until the TWT session is ended, the TWT user node S1 does not obtain the channel usage right, and cannot send out the data frame in time.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a wireless channel access scheme when an EDCA user node and a TWT user node exist in a WiFi network at the same time, which can prevent the EDCA user node from occupying a channel for too long, so that the TWT user node can obtain a channel right to use in a short TWT session, and send data out in time.
The embodiment of the invention provides a wireless channel access method of a WiFi network, wherein the WiFi network comprises a WiFi access point, a TWT user node and an EDCA user node, and the method comprises the following steps:
the EDCA user node acquires TWT session information of each TWT user node in a WiFi network notified by a WiFi access point, wherein the TWT session information of each TWT user node comprises a TWT session identifier, an occupied channel, a wake-up interval and a start time, and the start time is a time difference between the next wake-up time of the TWT user node and the current time;
adding the TWT session information of each TWT user node in the WiFi network to a TWT state library by the EDCA user node, and updating the TWT state library in real time;
after the EDCA user node obtains the use right of the first channel, adjusting the EDCA transmission opportunity limited time length according to the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length;
and the EDCA user node transmits data on the first channel according to the adjusted EDCA transmission opportunity limited time length.
In some embodiments, the adjusting, by the EDCA user node, the EDCA transmission opportunity limit duration includes: and the EDCA user node selects the minimum value from the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length and takes the minimum value as the EDCA transmission opportunity limited time length of this time.
In some embodiments, the EDCA user node updating the TWT status library in real time includes:
every time the EDCA user node passes through one time slot, the starting time of each TWT session in the TWT state base is recalculated according to the following formula,
Figure BDA0003328337970000051
wherein, tauiValue, τ, representing the start time of a TWT session in time slot ii+1Indicating the TWT meetingThe value of the start time of the session at time slot i +1, V, represents the wakeup interval of the TWT session.
In some embodiments, the EDCA user node updating the TWT status library in real time includes:
the EDCA user node monitors the state of the channel, updates the value of the channel state of each TWT session in the TWT state base according to the following formula,
csi+1＝α×csi+(1-α)×csc
wherein cs isiValue representing the channel state of a TWT session in time slot i, csi+1A value, cs, representing the channel state of the TWT session at time slot i +1cIndicating the state of the channel of the TWT session that the EDCA user node hears, α ∈ (0, 1) being the adjustment factor.
In some embodiments, the adjusting, by the EDCA user node, the EDCA transmission opportunity limit duration includes: and after the EDCA user node obtains the first channel use right, adjusting the EDCA transmission opportunity limited time length according to the starting time of each TWT session occupying the first channel and the channel state value of which exceeds a preset threshold value and the initial EDCA transmission opportunity limited time length.
In some embodiments, the adjusting, by the EDCA user node, the EDCA transmission opportunity limit duration includes: and the EDCA user node selects a minimum value from the starting time of each TWT session which occupies the first channel and the value of the channel state exceeds a preset threshold value and the initial EDCA transmission opportunity limited time length, and the minimum value is used as the current EDCA transmission opportunity limited time length.
In some embodiments, cs is the channel of the TWT session that the EDCA user node hears is busycIf the channel of the TWT session that the EDCA user node hears is idle, cs 1c＝0。
The embodiment of the invention provides an EDCA user node, which comprises: a memory; and a processor coupled to the memory, the processor configured to perform the wireless channel access method of the WiFi network of any of claims 1-7 based on instructions stored in the memory.
The embodiment of the invention provides a wireless channel access system of a WiFi network, which comprises: the EDCA user node and the WiFi access point are configured to notify the EDCA user node in the WiFi network of TWT session information of each TWT user node in the WiFi network, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
An embodiment of the invention proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a wireless channel access method for a WiFi network.
According to the embodiment of the invention, when the EDCA user node and the TWT user node exist in the WiFi network at the same time, the conflict between two channel access mechanisms can be avoided, and the overlong channel occupying time of the EDCA user node is avoided, so that the TWT user node can obtain the channel use right in time and send out data.
Drawings
Fig. 1 shows a schematic diagram of an operation principle of the TWT channel access method.
Fig. 2 shows a schematic diagram of a data transmission flow of an EDCA multi-frame mode.
Figure 3 shows a schematic diagram of an EDCA user node and a TWT user node in conflict.
Fig. 4 illustrates a flow diagram of a wireless channel access method for a WiFi network in accordance with some embodiments of the present invention.
Fig. 5 is a flowchart illustrating a method for accessing a wireless channel of a WiFi network according to another embodiment of the present invention.
Figure 6 illustrates TWT information element data formats for some embodiments of the present invention.
FIG. 7 illustrates a TWT state library of some embodiments of the present invention.
Fig. 8 illustrates an EDCA multi-frame pattern information transmission flow diagram according to some embodiments of the invention.
Fig. 9 illustrates a schematic diagram of a wireless channel access system of a WiFi network in accordance with some embodiments of the invention.
Figure 10 shows a schematic diagram of an EDCA user node in accordance with some embodiments of the invention.
Detailed Description
First embodiment
A wireless channel access method of a WiFi network, the WiFi network includes a WiFi access point, a TWT user node and an EDCA user node, as shown in fig. 4, the method includes:
step 110, the WiFi access point notifies the EDCA user node in the WiFi network of TWT session information of each TWT user node in the WiFi network, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
Step 120, the EDCA user node obtains TWT session information of each TWT user node in the WiFi network notified by the WiFi access point, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
Step 130, the EDCA user node adds the TWT session information of each TWT user node in the WiFi network to the TWT status library, and updates the TWT status library in real time.
The EDCA user node real-time updating TWT state base comprises the following steps: every time the EDCA user node passes through one time slot, the starting time of each TWT session in the TWT state base is recalculated according to the following formula,
Figure BDA0003328337970000081
wherein, tauiValue, τ, representing the start time of a TWT session in time slot ii+1A value indicating the start time of the TWT session at time slot i +1, and V indicates the wake-up interval of the TWT session.
In step 140, after the EDCA user node obtains the first channel usage right, the EDCA transmission opportunity limit duration of this time is adjusted according to the start time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limit duration.
The adjusting of the EDCA transmission opportunity limit duration of this time by the EDCA user node includes: and the EDCA user node selects the minimum value from the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length and takes the minimum value as the EDCA transmission opportunity limited time length of this time.
And 150, the EDCA user node transmits data on the first channel according to the adjusted limited time length of the EDCA transmission opportunity.
When the EDCA user node and the TWT user node exist in the WiFi network at the same time, the conflict of two channel access mechanisms can be avoided, the overlong channel occupation time of the EDCA user node is avoided, and the TWT user node can timely obtain the channel use right and send out data.
Second embodiment
A wireless channel access method of a WiFi network, the WiFi network includes a WiFi access point, a TWT user node and an EDCA user node, as shown in fig. 5, the method includes:
step 210, the WiFi access point notifies the EDCA user node in the WiFi network of TWT session information of each TWT user node in the WiFi network, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
Step 220, the EDCA user node acquires TWT session information of each TWT user node in the WiFi network notified by the WiFi access point, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
In step 230, the EDCA user node adds the TWT session information of each TWT user node in the WiFi network to the TWT status library, and updates the TWT status library in real time.
The EDCA user node real-time updating TWT state base comprises the following steps: every time the EDCA user node passes through one time slot, the starting time of each TWT session in the TWT state base is recalculated according to the following formula,
Figure BDA0003328337970000101
wherein, tauiValue, τ, representing the start time of a TWT session in time slot ii+1A value indicating the start time of the TWT session at time slot i +1, and V indicates the wake-up interval of the TWT session.
The EDCA user node real-time updating the TWT state base further comprises: the EDCA user node monitors the state of the channel, updates the value of the channel state of each TWT session in the TWT state base according to the following formula,
csi+1＝α×csi+(1-α)×csc
wherein cs isiValue representing the channel state of a TWT session in time slot i, csi+1A value, cs, representing the channel state of the TWT session at time slot i +1cIndicating the state of the channel of the TWT session that the EDCA user node hears, α ∈ (0, 1) being the adjustment factor.
If the EDCA user node hears that the channel of the TWT session is busy, cscIf the channel of the TWT session that the EDCA user node hears is idle, cs 1c＝0。
Step 240, after the EDCA user node obtains the first channel usage right, the EDCA transmission opportunity limit duration of this time is adjusted according to the channel state of each TWT session, the start time of each TWT session occupying the first channel, and the initial EDCA transmission opportunity limit duration.
The adjusting of the EDCA transmission opportunity limit duration of this time by the EDCA user node includes: and after the EDCA user node obtains the first channel use right, adjusting the EDCA transmission opportunity limited time length according to the starting time of each TWT session occupying the first channel and the channel state value of which exceeds a preset threshold value and the initial EDCA transmission opportunity limited time length.
The channel state value exceeding the preset threshold value indicates that the corresponding TWT session interferes with the EDCA user node to a certain extent. And the TWT session with the interference reaching a certain degree is considered when the EDCA transmission opportunity limit time is adjusted, and the TWT session with the interference not reaching the certain degree is not considered when the EDCA transmission opportunity limit time is adjusted. Therefore, the situation that the EDCA user node occupies too long channel time is avoided, the TWT user node can obtain the channel use right in time, and meanwhile, the whole communication efficiency of the WiFi network can be considered.
And step 250, the EDCA user node transmits data on the first channel according to the adjusted limited time length of the EDCA transmission opportunity.
When the EDCA user node and the TWT user node exist in the WiFi network at the same time, the phenomenon that the EDCA user node occupies a channel for too long time is avoided, the TWT user node can obtain a channel use right in time, and meanwhile, the whole communication efficiency of the WiFi network can be considered.
Third embodiment
A wireless channel access method of a WiFi network, wherein the WiFi network comprises a WiFi access point, a TWT user node and an EDCA user node, and the method comprises the following steps:
1. through the TWT standard signaling interaction flow, the TWT user node and the AP negotiate the TWT session parameters such as the awakening time, the awakening interval, the active duration, the channel and the like.
2. After the negotiation is successful, the AP adds a TWT Information Element (IE) to a Beacon message periodically sent by the AP, and notifies other user nodes in the network of Information of a TWT session in the network, where the TWT Information Element includes: session identification, wake-up interval, active duration, start time, channel, etc. The starting time is a time difference between the next wakeup time of the TWT user node and the current time.
And 3, the EDCA user node establishes a TWT state base locally, after the EDCA user node receives the Beacon message broadcasted by the AP, the TWT session information is extracted from the TWT information unit of the Beacon message, new TWT session information is added to the TWT state base, and the invalid TWT session information is deleted from the TWT state.
4. Every time a time slot passes, the EDCA user node recalculates the 'starting time' of each TWT session in the TWT state base.
5. When the TWT user node and the AP carry out TWT conversation, the EDCA user node monitors the channel state, judges whether the channel is busy, and updates the channel state domain of the TWT conversation corresponding list in the TWT state base according to the channel monitoring result.
6. Before sending data, the EDCA user node firstly executes BO operation, and once the BO operation is finished, the EDCA user node acquires the channel use right and then executes the following steps:
1) according to the channel state field in the TWT state base, searching the TWT conversation which obtains the channel of the usage right and the value of the channel state field exceeds the preset value, and finding the minimum starting time value tau from the 'starting time' of the conversationmin。
2) Updating the multi-frame transmission time length of the EDCA user node (i.e. EDCA transmission opportunity limit time length), and setting the multi-frame transmission time length of the EDCA user node to tauminAnd Ttxop_limitThe minimum of the two. T istxop_limitA time duration is defined for the set initial EDCA transmission opportunity, e.g. for a multi-frame transmission time duration specified in the relevant standard.
3) The EDCA user node then transmits the data frame according to the flow shown in fig. 2.
Fourth embodiment
A wireless channel access method of a WiFi network, wherein the WiFi network comprises a WiFi access point, a TWT user node and an EDCA user node, and the method comprises the following steps:
the AP periodically broadcasts the Beacon message in the network, and the sending interval of the Beacon message is TBTT (Target Beacon Transmission Time).
2. Through the TWT standard signaling interaction flow, the TWT user node and the AP negotiate the TWT session parameters such as the awakening time, the awakening interval, the active duration, the channel and the like. After the negotiation is successful, the AP adds a TWT Information Element (IE) to a Beacon message periodically sent by the AP, and notifies other user nodes in the network of Information of a TWT session in the network, where the TWT Information Element includes: session identification, wake-up interval, active duration, start time, channel, etc. The starting time is a time difference between the next wakeup time of the TWT user node and the current time.
The format of the TWT information element is shown in fig. 4. Wherein: (1) an IE ID field, which is the identification of the TWT information element and is 8 bits long; (2) a Length field, which is the Length of the TWT information unit, and the unit is Byte, and the Length is 8 bits long; (3) the TWT SN domains are parameters of TWT sessions, 64 bits long, and in one TWT information unit, may include multiple TWT SN domains, each TWN SN domain includes 5 sub-domains such as AID, wake-up interval, active duration, start time, channel, etc., where the "AID" sub-domain is an association ID of a TWT user node; the "start time" subfield is the time difference between the next wake up time and the current time.
And 3, the EDCA user node establishes a TWT state library locally, and after the EDCA user node receives the Beacon message broadcasted by the AP, the TWT session information is extracted from the TWT information unit of the Beacon message, and the local TWT state library is maintained.
The TWT state library is shown in fig. 5. When there is a new TWT session in the TWT information element, the EDCA user node will newly build a list in the TWT status library, and add the information of the TWT session (including AID, wake-up interval, active duration, start time, channel) and channel status to the list.
4. Every time a time slot passes, the EDCA user node recalculates the 'starting time' of each TWT session in the TWT state base.
Suppose that at time slot i, the value of the TWT session "start time" field in the state library is τiThen, in the i +1 slot, the value τ of the "start time" fieldi+1Comprises the following steps:
Figure BDA0003328337970000141
where V is the wakeup interval of the TWT session.
5. When the TWT user node and the AP perform a TWT session, the EDCA user node may monitor a Channel state through a CCA (Clear Channel Assessment) mechanism in the 802.11ax protocol, and update a Channel state domain of a corresponding list of the TWT session in the TWT state library according to a monitoring result. The specific updating method may be:
1) assuming that the value of the channel state field of a certain TWT session in the TWT state library at time slot i is csi；
2) The EDCA user node executes a CCA mechanism, and the monitored channel state is cscAnd cs when EDCA user node monitors that the channel is busy through the CCA mechanism c1 is ═ 1; when EDCA user node monitors the channel to be idle through CCA mechanism, csc＝0；
3) According to CCA monitoring result, the EDCA user node updates the value of the channel state field of the TWT conversation in the time slot i +1 to csi+1＝α×csi+(1-α)×cscWherein alpha epsilon (0, 1) is a regulating factor.
6. Before sending data, the EDCA user node first performs a BO operation, and once the BO operation is finished, the EDCA user node obtains a channel use right (assuming that a first channel use right is obtained), and further performs the following steps:
1) presetting a channel state threshold beta, searching a channel for obtaining a use right in a local TWT state table, and forming a set B by a TWT conversation of which the channel state value exceeds the threshold beta;
2) from these sessions of set B, the minimum starting time value τ is foundmin。
3) Updating multiframe sending time length T of EDCA user nodemfSpecifically:
if τmin＜Ttxop_limitThe multi-frame transmission time length of the EDCA user node is taumin(ii) a Otherwise, the multi-frame sending time length of the EDCA user node is Ttxop_limit。
4) Thereafter, the EDCA user node transmits the data frame according to the flow shown in fig. 8.
Through the second/third/fourth embodiment, when the EDCA user node and the TWT user node exist in the WiFi network at the same time, the EDCA user node is prevented from occupying the channel for too long, so that the TWT user node can obtain the channel right in time, and the overall communication efficiency of the WiFi network can be considered.
Fifth embodiment
As shown in fig. 9, a wireless channel access system 900 of a WiFi network includes a WiFi access point 910 and an EDCA user node 920.
And the WiFi access point 910 is configured to notify the EDCA user node in the WiFi network of TWT session information of each TWT user node in the WiFi network, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
The WiFi access point 910 includes a TWT session notification module configured to notify EDCA user nodes in the WiFi network of TWT session information of each TWT user node in the WiFi network, where the TWT session information of each TWT user node includes an identifier of the TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time.
The EDCA user node 920 is configured to acquire TWT session information of each TWT user node in the WiFi network notified by the WiFi access point, where the TWT session information of each TWT user node includes an identifier of a TWT session, an occupied channel, a wake-up interval, and a start time, where the start time is a time difference between a next wake-up time of the TWT user node and a current time; adding the TWT session information of each TWT user node in the WiFi network to a TWT state base, and updating the TWT state base in real time; after the first channel use right is obtained, adjusting the EDCA transmission opportunity limited time length of this time according to the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length; and transmitting data on the first channel according to the adjusted EDCA transmission opportunity limited time length.
The EDCA user node 920 includes a TWT status library module and a multi-frame transmission time length adjustment module. The system comprises a TWT state library module, a TWT state library module and a wireless fidelity (WiFi) state library module, wherein the TWT state library module is configured to acquire TWT session information of each TWT user node in a WiFi network notified by a WiFi access point, and the TWT session information of each TWT user node comprises a TWT session identifier, an occupied channel, a wake-up interval and a start moment, wherein the start moment is a time difference value between the next wake-up moment of the TWT user node and the current moment; adding the TWT session information of each TWT user node in the WiFi network to a TWT state base, and updating the TWT state base in real time; the multi-frame sending time length adjusting module is configured to adjust the EDCA transmission opportunity limit time length of the current time according to the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limit time length after obtaining the use right of the first channel; and transmitting data on the first channel according to the adjusted EDCA transmission opportunity limited time length.
And the EDCA user node selects the minimum value from the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length and takes the minimum value as the EDCA transmission opportunity limited time length of this time.
Or, the EDCA user node selects the minimum value from the start time of each TWT session that occupies the first channel and whose channel state value exceeds the preset threshold and the initial EDCA transmission opportunity limit duration, and takes the minimum value as the EDCA transmission opportunity limit duration of this time.
As shown in fig. 10, an EDCA user node 920 includes: a memory 921; and a processor 922 coupled to the memory 921, the processor 922 being configured to execute the wireless channel access method of the WiFi network of any of the foregoing embodiments based on instructions stored in the memory.
The memory 921 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer program code embodied therein.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (10)

1.A wireless channel access method of a WiFi network, the WiFi network includes WiFi access point, TWT user node and EDCA user node, characterized by, including:
the EDCA user node acquires TWT session information of each TWT user node in a WiFi network notified by a WiFi access point, wherein the TWT session information of each TWT user node comprises a TWT session identifier, an occupied channel, a wake-up interval and a start time, and the start time is a time difference between the next wake-up time of the TWT user node and the current time;
adding the TWT session information of each TWT user node in the WiFi network to a TWT state library by the EDCA user node, and updating the TWT state library in real time;
after the EDCA user node obtains the use right of the first channel, adjusting the EDCA transmission opportunity limited time length according to the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length;
and the EDCA user node transmits data on the first channel according to the adjusted EDCA transmission opportunity limited time length.
2. The method of claim 1, wherein the EDCA user node adjusting the EDCA transmission opportunity limit duration comprises:
and the EDCA user node selects the minimum value from the starting time of each TWT session occupying the first channel and the initial EDCA transmission opportunity limited time length and takes the minimum value as the EDCA transmission opportunity limited time length of this time.
3. The wireless channel access method of the WiFi network of claim 1, wherein the EDCA user node updating the TWT status base in real time comprises:
every time the EDCA user node passes through one time slot, the starting time of each TWT session in the TWT state base is recalculated according to the following formula,
Figure FDA0003328337960000021
wherein, tauiValue, τ, representing the start time of a TWT session in time slot ii+1A value indicating the start time of the TWT session at time slot i +1, and V indicates the wake-up interval of the TWT session.
4. The wireless channel access method of the WiFi network of claim 1, wherein the EDCA user node updating the TWT status base in real time comprises:
the EDCA user node monitors the state of the channel, updates the value of the channel state of each TWT session in the TWT state base according to the following formula,
csi+1＝α×csi+(1-α)×csc
wherein cs isiValue representing the channel state of a TWT session in time slot i, csi+1A value, cs, representing the channel state of the TWT session at time slot i +1cIndicating the state of the channel of the TWT session that the EDCA user node hears, α ∈ (0, 1) being the adjustment factor.
5. The method of claim 4, wherein the EDCA user node adjusting the EDCA transmission opportunity limit duration comprises:
and after the EDCA user node obtains the first channel use right, adjusting the EDCA transmission opportunity limited time length according to the starting time of each TWT session occupying the first channel and the channel state value of which exceeds a preset threshold value and the initial EDCA transmission opportunity limited time length.
6. The method of claim 5, wherein the EDCA user node adjusting the EDCA transmission opportunity limit duration comprises:
and the EDCA user node selects a minimum value from the starting time of each TWT session which occupies the first channel and the value of the channel state exceeds a preset threshold value and the initial EDCA transmission opportunity limited time length, and the minimum value is used as the current EDCA transmission opportunity limited time length.
7. The wireless channel access method of WiFi network of claim 4, wherein if the channel of the TWT session monitored by EDCA user node is busy, cscIf the channel of the TWT session that the EDCA user node hears is idle, cs 1c＝0。
8. An EDCA user node, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the wireless channel access method of the WiFi network of any of claims 1-7 based on instructions stored in the memory.
9. A wireless channel access system for a WiFi network, comprising:
the EDCA user node of claim 8, and
and the WiFi access point is configured to notify the EDCA user nodes in the WiFi network of the TWT session information of each TWT user node in the WiFi network, wherein the TWT session information of each TWT user node comprises the identification of the TWT session, the occupied channel, the wake-up interval and the start moment, and the start moment is the time difference value between the next wake-up moment of the TWT user node and the current moment.
10. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the wireless channel access method of a WiFi network of any one of claims 1-7.
CN202111272357.1A 2021-10-29 2021-10-29 Wireless channel access method and system of WiFi network and EDCA user node Pending CN113939038A (en)

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