WO2017036258A1

WO2017036258A1 - Contention access method, contention access device, base station and contention access system

Info

Publication number: WO2017036258A1
Application number: PCT/CN2016/090856
Authority: WO
Inventors: 杨懋; 屈桥; 李云波
Original assignee: 华为技术有限公司
Priority date: 2015-09-02
Filing date: 2016-07-21
Publication date: 2017-03-09

Abstract

The present invention provides a communications method applied to a WLAN, comprising: a station receiving a trigger frame sent by an access point, the trigger frame indicating that a part of sub-channels is allocated to a scheduled station, and another part of the sub-channels is for random access; if the station is a scheduled station, monitoring whether or not the sub-channel allocated to the station is busy; if so, then randomly selecting an idle random access sub-channel and sending data, or first performing a backoff, and after the backoff is complete, again randomly selecting an idle random access sub-channel and sending data. The present invention provides a WLAN communications method and related apparatus, capable of effectively improving station uplink access efficiency and network functions.

Description

Competitive access method, competitive access device, site and competitive access system

This application claims the priority of the CN patent application submitted to the China Patent Office on September 2, 2015, the application number is 201510558023.9, and the invention name is “competition access method, competition access device, site and competition access system”. The application also requires the priority of the CN patent application filed on November 3, 2015, the Chinese Patent Office, application number 201510738789.5, and the invention name "competition access method, competition access device, site and competition access system". The entire contents of both applications are incorporated herein by reference.

Technical field

The embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a contention access method, a contention access device, a station, and a contention access system.

Background technique

Wireless Local Area Networks (WLAN) is a data transmission system that uses radio frequency technology to communicate and connect in the air using electromagnetic waves. Station (Station, referred to as STA) and access point (Access Point, referred to as The AP is a basic component of the WLAN. Specifically, the AP connects the STAs together and then connects the wireless network to the Ethernet.

The IEEE 802.11 protocol is a standard established by the Institute of Electrical and Electronics Engineers for wireless local area networks in September 2009. Currently commonly used protocols are: IEEE 802.11n and IEEE 802.11ac, and multi-channel communication is used in the above two protocols. . Specifically, the STA accesses the signal in a manner that is avoided by the carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), that is, the STA needs to transmit data in a competitive manner. In the process of transmitting data by the STA, a backoff value needs to be determined first. The AP sends a Trigger Frame (TF) to indicate a subchannel that can be used for random contention. After receiving the TF, the STA reduces the backoff value by one. If the backoff value becomes 0, the STA randomly selects one subchannel to transmit the uplink packet.

However, the STA randomly selects one subchannel to transmit the uplink data packet. If the channel to which the randomly selected subchannel belongs is busy, the STA cannot send the uplink data packet, and also interferes with other data packets being transmitted by using the subchannel. , reducing the efficiency of uplink access, thereby reducing the network's performance.

Summary of the invention

The embodiments of the present invention provide a contention access method, a contention access device, a site, and a contention access system, which are used to improve uplink access efficiency and improve network performance.

A first aspect of the present invention provides a contention access method, including:

Receiving, by the station, a trigger frame sent by the access point, where the trigger frame includes a channel identifier and allocation information corresponding to the channel identifier;

The station listens to whether the channel corresponding to the channel identifier is idle;

If the station detects that there is a free channel, select at least one subchannel from the idle channel according to the allocation information of the idle channel, and send a data packet by using the selected at least one subchannel; or The allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame is performed, and the backoff processing is performed.

With reference to the first aspect, in a first possible implementation manner of the first aspect, if the allocation information of the idle channel includes a subchannel for contention, the allocation information corresponding to the idle channel or the The allocation information corresponding to the channel identifier included in the trigger frame is performed, and the backoff processing is performed, including:

And subtracting the first backoff value from the first backoff value according to the allocation information corresponding to the idle channel, and acquiring a second backoff value;

Determining whether the second backoff value is less than or equal to 0, and if the second backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and transmitting the data packet by using the selected at least one subchannel;

The first backoff value is a backoff value when the station receives the trigger frame, and the first number is the number of subchannels used for contention in the allocation information of the idle channel.

In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:

If the second backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the first aspect, in a third possible implementation manner of the first aspect, if the allocation information corresponding to the channel identifier includes a subchannel for contention, the allocation information corresponding to the idle channel or The allocation information corresponding to the channel identifier included in the trigger frame is performed at the backoff Rational, including:

Determining the first backoff value by the second amount according to the allocation information corresponding to the channel identifier included in the trigger frame, and acquiring the third backoff value;

Determining whether the third backoff value is less than or equal to 0, and if the third backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and transmitting the data packet by using the selected at least one subchannel;

The first backoff value is a backoff value when the station receives the trigger frame, and the second number is the total number of all the subchannels used for contention included in the trigger frame.

In combination with the third possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, the method further includes:

If the third backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the first aspect, in a fifth possible implementation manner of the first aspect, if the allocation information of the idle channel includes a subchannel for contention and allocated to the station, Channel allocation information, selecting at least one subchannel from the idle channel, and transmitting the data packet by using the selected at least one subchannel, including:

And selecting, according to the idle channel allocation information, the subchannel for contention and allocated to the station from the idle channel to send the data packet.

With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes:

Determining, in the trigger frame, whether there is a subchannel for contention and allocated to the station, and if yes, determining whether a channel that is used for contention and that is allocated to the subchannel to which the station belongs is idle. channel;

And performing the backoff processing according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame, including:

If it is determined that the existing channel for the contention and the subchannel to which the station belongs is not the idle channel, the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame is determined. , carry out the evacuation process.

In combination with the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes:

And selecting, according to the allocation information of the idle channel, selecting at least one subchannel from the idle channel, and sending the data packet by using the selected at least one subchannel, including:

If it is determined that the existing channel for contention and the subchannel allocated to the station belongs to is not an idle channel, selecting at least one subchannel from the idle channel according to the allocation information of the idle channel, and passing The selected at least one subchannel transmits a data packet.

A second aspect of the present invention provides a contention access apparatus, including:

a transceiver module, configured to receive a trigger frame sent by the access point, where the trigger frame includes a channel identifier and allocation information corresponding to the channel identifier;

a listening module, configured to listen to whether a channel corresponding to the channel identifier is idle;

a processing module, if the listening module detects that there is a free channel, and is configured to select at least one subchannel from the idle channel according to the allocation information of the idle channel, and trigger the transceiver module to pass the selected The at least one subchannel transmits the data packet; or performs the backoff processing according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame.

With reference to the second aspect, in a first possible implementation manner of the second aspect, if the allocation information of the idle channel includes a subchannel for contention, the processing module includes:

The first backoff unit is configured to subtract the first backoff value from the first backoff value according to the allocation information corresponding to the idle channel, and obtain a second backoff value;

a first determining unit, configured to determine whether the second backoff value is less than or equal to 0, and if the second backoff value is less than or equal to 0, select at least one subchannel from the idle channel, and trigger the transceiver module to pass Selecting at least one subchannel to send a data packet;

With reference to the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, if the second backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the second aspect, in a third possible implementation manner of the second aspect, if the allocation information corresponding to the channel identifier includes a subchannel for contention, the processing module includes:

a second backoff unit, configured to subtract a second backoff value from the second backoff value according to the allocation information corresponding to the channel identifier included in the trigger frame, to obtain a third backoff value;

a second determining unit, configured to determine whether the third backoff value is less than or equal to 0, if the third back If the value of the evasion is less than or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transceiver module to send the data packet by using the selected at least one subchannel;

With reference to the third possible implementation manner of the second aspect, in the fourth possible implementation manner of the second aspect, if the third backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the second aspect, in a fifth possible implementation manner of the second aspect, if the allocation information of the idle channel includes a subchannel for contention and allocated to the contention access device, the processing is performed. The module is specifically configured to select, according to the idle channel allocation information, the subchannel for contention and allocated to the contention access device from the idle channel, and trigger the transceiver module to select by using the The data packet is used for contention and is allocated to the sub-channel of the contention access device.

With reference to the second aspect, in a sixth possible implementation manner of the second aspect, the processing module is further configured to determine whether, in the trigger frame, there is a subchannel allocated for the contention and allocated to the contention access device If yes, determining whether the existing channel for contention and the subchannel allocated to the contention access device belongs to is a free channel;

If it is determined that the existing channel for the contention and the subchannel to which the contention access device belongs is not the idle channel, the corresponding information according to the idle channel or the channel identifier included in the trigger frame is corresponding. The allocation information is subjected to backoff processing.

With reference to the second aspect, in a seventh possible implementation manner of the second aspect, the processing module is further configured to determine whether, in the trigger frame, there is a subchannel allocated for the contention and allocated to the contention access device If yes, determining whether the existing channel for contention and the subchannel allocated to the contention access device belongs to is a free channel;

If it is determined that the existing channel for contention and the subchannel allocated to the contention access device belongs to is not an idle channel, selecting at least one subchannel from the idle channel according to the allocation information of the idle channel And transmitting the data packet through the selected at least one subchannel.

A third aspect of the present invention provides a station, including: a processor, a transmitter, and a receiver,

The receiver is configured to receive a trigger frame sent by the access point, where the trigger frame includes a channel identifier and allocation information corresponding to the channel identifier;

The processor is configured to listen to whether a channel corresponding to the channel identifier is idle;

The processor is further configured to: if the idle channel is detected, select at least one subchannel from the idle channel according to the allocation information of the idle channel, and trigger the transmitter to pass the selected at least One subchannel transmits a data packet; or performs a backoff process according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame.

With reference to the third aspect, in a first possible implementation manner of the third aspect, if the allocation information of the idle channel includes a subchannel for contention, the processor is specifically configured to:

Determining whether the second backoff value is less than or equal to 0, and if the second backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transmitter to pass the selected at least one sub Channel sending data packet;

In conjunction with the first possible implementation manner of the third aspect, in a possible implementation manner of the third aspect, if the second backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the third aspect, in a third possible implementation manner of the third aspect, if the allocation information corresponding to the channel identifier includes a subchannel for contention, the processor is further configured to:

Obtaining a second backoff value by subtracting a second amount from the second backoff value according to the allocation information corresponding to the channel identifier included in the trigger frame;

Determining whether the third backoff value is less than or equal to 0, and if the third backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transmitter to pass the selected at least one sub Channel sending data packet;

In conjunction with the third possible implementation manner of the third aspect, in the fourth possible implementation manner of the third aspect, if the third backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

With reference to the third aspect, in a fifth possible implementation manner of the third aspect, if the allocation information of the idle channel includes a subchannel for contention and allocated to the station, the processor specifically uses And: selecting, according to the idle channel allocation information, the subchannel used for contention and allocated to the station from the idle channel, and triggering the transmitter to use the selected one for The data packets are transmitted by the subchannels that are contentive and assigned to the station.

With reference to the third aspect, in a sixth possible implementation manner of the third aspect, the processor is further configured to: determine, in the trigger frame, whether there is a subchannel for contention and allocated to the station, if If yes, it is determined whether the existing channel for contention and the subchannel allocated to the station belongs to is a free channel;

With reference to the third aspect, in a seventh possible implementation manner of the third aspect, the processor is further configured to: determine, in the trigger frame, whether there is a subchannel for contention and allocated to the station, if If yes, it is determined whether the existing channel for contention and the subchannel allocated to the station belongs to is a free channel;

A fourth aspect of the present invention provides a contention access system comprising: an access point and a station, the station being a contention access device.

The contention access method, the contention access device, the station, and the contention access system provided by the embodiment of the present invention, according to the trigger frame sent by the received access point, the station listens to whether the channel corresponding to the channel identifier is idle, and is in the process of detecting When the idle channel is heard, selecting at least one subchannel from the idle channel according to the allocation information of the idle channel, and transmitting the data packet through the selected at least one subchannel, or according to the idle channel and the channel identifier included in the trigger frame. Allocating information, performing backoff processing, first determining whether the channel corresponding to the channel identifier is an idle channel, and then selecting at least one subchannel from the available idle channels, or corresponding to the allocation information corresponding to the idle channel or the channel identifier included in the trigger frame. The allocation information is subjected to the backoff processing. Therefore, it is ensured that once a subchannel is selected, it is necessarily a subchannel in the idle channel, thereby avoiding the problem that the channel of the subchannel randomly selected by the station is busy in the prior art. Reduce the efficiency of uplink access, thereby reducing the performance of the network Thereby effectively improving the efficiency of uplink access the site, and improving network performance.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic structural diagram of a WLAN system according to the present invention;

FIG. 2 is a flowchart of Embodiment 1 of a contention access method according to an embodiment of the present invention;

FIG. 3 is a flowchart of Embodiment 2 of a contention access method according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of Embodiment 2 of a contention access method according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of Embodiment 3 of a contention access method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of Embodiment 3 of a contention access method according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of Embodiment 5 of a contention access method according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of Embodiment 6 of a contention access method according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of Embodiment 1 of a contention access device according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of Embodiment 2 of a contention access device according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of Embodiment 3 of a contention access device according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a site according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a contention access system according to an embodiment of the present invention.

FIG. 14 is a schematic diagram of an application scenario according to Embodiment 7 of the present invention.

FIG. 15 is a flowchart of a communication method applied to a wireless local area network according to Embodiment 7 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention can be applied to a WLAN. Currently, the standard adopted by the WLAN is the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series. The station (Station, referred to as STA) and the access point (AP) are the basic components of the WLAN.

Specifically, the STA is generally a client in the WLAN. The STA can be mobile or fixed, and is the most basic component of a wireless local area network. The AP is an access point for mobile users to enter the wired network. It is mainly deployed in the home, inside the building, and inside the campus. The typical coverage radius is tens of meters to hundreds of meters. Of course, it can also be deployed outdoors. An AP is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect the wireless network clients together and then connect the wireless network to the Ethernet. Specifically, the AP may be a terminal device or a network device with a Wireless Fidelity (WiFi) chip. Optionally, the AP may be a device supporting the 802.11ax system. Further, the AP may be a device supporting multiple WLAN technologies such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

FIG. 1 is a schematic structural diagram of a WLAN system according to the present invention. As shown in FIG. 1 , an AP in a WLAN system can perform information interaction with multiple STAs (including three examples), including STA1, STA2, and STA3. Of course, it is not limited to this, and one AP can also perform information interaction with multiple STA groups.

Specifically, single channel communication is adopted in the 802.11a protocol. In order to improve site access efficiency, multi-channel communication is adopted in the 802.11ac and 802.11n protocols, and the bandwidth of each channel in the multi-channel communication is not specifically limited, and different The bandwidth specification for the channel is different in the protocol. In addition, the number of divided channels is determined according to specific scheduling conditions. However, in the scenario where the transmission data packet is small, the uplink access efficiency using such multi-channel communication is not very high. Therefore, a communication method in which multiple channels and channels are divided into multiple subchannels is proposed, wherein each subchannel The bandwidth and the number of subchannels are determined according to specific scheduling conditions. In this communication mode, not only each subchannel can transmit data packets, but also multiple channels can be used to transmit data packets. Therefore, this communication method can be greatly Improve uplink access efficiency.

In a multi-channel and channel is divided into multiple sub-channel communication states, the STA accesses the channel in a CSMA/CA manner, that is, the STA needs to transmit data packets in a contentive manner.

In addition, the current WLAN use bandwidth type is 20MHz, 40MHz, 80MHz, 160MHz, 80+80MHz. This channel aggregation mode is a continuous channel aggregation mode, and the next generation WLAN can also adopt a non-continuous channel aggregation method, but In the channel aggregation mode, both the AP and the STA have the capability of full channel interception. Therefore, the channels in the embodiment of the present invention are all described by using a channel with a bandwidth of 20 MHz as an example.

The principle of the embodiment of the present invention is described below:

FIG. 2 is a flowchart of Embodiment 1 of a contention access method according to an embodiment of the present invention; as shown in FIG. 2, the contention access method provided by Embodiment 1 of the present invention specifically includes the following steps:

Step S201: The station receives a trigger frame sent by the access point, where the trigger frame includes allocation information corresponding to the channel identifier and the channel identifier.

The trigger frame includes at least one channel identifier, and the allocation information corresponding to the channel identifier is specifically, which subchannels in each channel are available for random contention.

Step S202: The station listens to whether the channel corresponding to the channel identifier is idle.

Step S203: If the station detects that there is a free channel, select at least one subchannel from the idle channel according to the allocation information of the idle channel, and send the data packet through the selected at least one subchannel; or according to the allocation information corresponding to the idle channel. Or the allocation information corresponding to the channel identifier included in the trigger frame is used to perform the backoff processing.

The contention access method provided by the embodiment of the present invention detects whether the channel corresponding to the channel identifier is idle according to the trigger frame sent by the received access point, and according to the allocation of the idle channel when detecting the idle channel. The information is: selecting at least one subchannel from the idle channel, and transmitting the data packet by using the selected at least one subchannel, or performing backoff processing according to the allocation information corresponding to the channel identifier included in the idle channel and the trigger frame, because the channel identifier is determined first Which of the corresponding channels is an idle channel, and at least one subchannel is selected from the available idle channels, or the backoff processing is performed according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame, thereby ensuring Once the at least one subchannel is selected, it is necessarily a subchannel in the idle channel, thereby avoiding the efficiency of reducing the uplink access caused by the busy channel of the subchannel randomly selected by the station in the prior art, thereby reducing the network. Performance issues, which in turn effectively improve site uplink access Rate, and improve network performance.

The following embodiments will provide a specific implementation manner of the first embodiment. In the following embodiments, the following scenarios are taken as an example. One AP interacts with two STAs, and two STAs are STA1 and STA2. Of course, it is not limited to this, and one AP can also exchange information with multiple STA groups.

The present invention provides a specific implementation manner of the first embodiment. Based on the technical solution of the first embodiment of the present invention, FIG. 3 is a flowchart of Embodiment 2 of the contention access method according to the embodiment of the present invention; As shown in the second embodiment of the present invention, if the allocation information of the idle channel includes a subchannel for contention, the allocation information corresponding to the idle channel in step S203 is shown. Or the allocation information corresponding to the channel identifier included in the frame is triggered, and the backoff processing is performed, including:

Step S301: Subtract the first backoff value from the first backoff value according to the allocation information corresponding to the idle channel, and obtain the second backoff value.

Step S302: Determine whether the second backoff value is less than or equal to 0. If the second backoff value is less than or equal to 0, select at least one subchannel from the idle channel, and send the data packet through the selected at least one subchannel.

In addition, the contention access method provided in this embodiment further includes: if the second backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

In this embodiment, for example, the description includes two channel identifiers in the trigger frame as an example, specifically including: channel 1 and channel 2, and dividing each channel into four subchannels, and the sub-number of each channel is from The next time is sub-channel 1-4, wherein the allocation information corresponding to each channel identifier of the trigger frame is that 4 subchannels of channel 1 can be used for random competition, and subchannel 1 and subchannel 2 of channel 2 can be used for random competition. . Of course, it is not limited to this. The trigger frame may include multiple channel identifiers, and the corresponding allocation information of each channel identifier is not limited thereto.

In addition, the STA's first backoff value is selected before the AP transmits the TF frame according to the selection in the IEEE 802.11 protocol. In this embodiment, for example, the first backoff value of STA1 is 3, and the first backoff value of STA2 is 7 as an example.

Specifically, FIG. 4 is a schematic diagram of Embodiment 2 of a contention access method according to an embodiment of the present invention. As shown in FIG. 4, if a station is STA1, STA1 receives an access point to send the trigger frame, for example, TF-1, and detects It is heard that channel 1 is idle and channel 2 is busy. Since the allocation information corresponding to channel 1 in TF-1 is that there are 4 subchannels on channel 1 that can be used for random competition, STA1 decrements the first backoff value by 4 (ie a first number) to obtain a second backoff value, the second backoff value being less than or equal to 0. Therefore, STA1 may select at least one subchannel from the idle channel (channel 1), for example, select subchannel 1 to transmit uplink data DATA. -1 (ie, data packet), or select subchannel 1 and subchannel 2, and send uplink data DATA-1 (ie, data packet) through subchannel 1 and subchannel 2. It should be noted that FIG. 4 is to select a subchannel. 1 is explained as an example.

The station is STA2, STA2 detects that channel 1 is busy, and channel 2 is idle. Since the allocation information corresponding to channel 2 in TF-1 is 2 channels on channel 2, it can be used for random competition. The STA1 subtracts 2 (that is, the first number) from the first backoff value to obtain a second backoff value (5). Since the second backoff value is greater than 0, STA2 backoff is not completed, and cannot be selected from the idle channel. The subchannel transmits uplink data DATA-2 (ie, a data packet).

Further, for STA2, the trigger frame sent by the access point may be received again, for example, TF-2, and after receiving the TF-2, STA2 has a first backoff value of 5, and then performs physical carrier sensing. STA2 hears that both channel 1 and channel 2 are idle. Since TF-2 indicates that there are 6 subchannels on channel 1 and channel 2 that can be used for contention at any time, STA2 subtracts 6 from the first backoff value. The first number is obtained to obtain the second backoff value, and the second backoff value is less than 0. Therefore, STA2 may randomly select at least one subchannel from the idle channel to send the uplink data DATA-2.

In another specific implementation manner of the first embodiment of the present invention, based on the technical solution of the first embodiment of the present invention, FIG. 5 is a flowchart of Embodiment 3 of a contention access method according to an embodiment of the present invention; As shown in FIG. 5, in the contention access method provided by the third embodiment of the present invention, if the allocation information corresponding to the channel identifier includes the subchannel for contention, the allocation information corresponding to the idle channel or the trigger frame is included in step S203. The channel identification corresponds to the allocation information, and performs backoff processing, including:

In step S501, the first backoff value is subtracted from the second number according to the allocation information corresponding to the channel identifier included in the trigger frame, and the third backoff value is obtained.

Step S502: Determine whether the third backoff value is less than or equal to 0. If the third backoff value is less than or equal to 0, select at least one subchannel from the idle channel, and send the data packet by using the selected at least one subchannel.

In addition, the contention access method provided in this embodiment further includes: if the third backoff value is greater than 0, the backoff is not completed, and the data packet is not sent.

In addition, the STA's first backoff value is selected before the AP transmits the TF frame according to the selection in the IEEE 802.11 protocol. In this embodiment, for example, the first backoff value of STA1 is 3, and the second backoff value of STA2 is 7 as an example.

Specifically, FIG. 6 is a schematic diagram of Embodiment 3 of a contention access method according to an embodiment of the present invention. As shown in FIG. 6, if a station is STA1, STA1 receives an access point to send the trigger frame, for example, TF-1, and detects It is heard that channel 1 is idle and channel 2 is busy. Since the allocation information corresponding to the channel identifier in TF-1 is that channel 1 and channel 6 have a total of six subchannels that can be used for random competition, STA1 reduces the first backoff value. 6 (ie, the second number) to obtain a third backoff value, which is less than or equal to 0. Therefore, STA1 may select at least one subchannel from the idle channel (channel 1), for example, select subchannel 1 to send Uplink data DATA-1 (ie, data packet), or select subchannel 1 and subchannel 2, and send uplink data DATA-1 (ie, data packet) through subchannel 1 and subchannel 2, it should be noted that FIG. 6 is The subchannel 1 is selected as an example for explanation.

If the station is STA2, STA2 detects that channel 1 is busy and channel 2 is idle. Since the allocation information corresponding to the TF-1 channel identifier is that channel 1 and channel 2 have 6 subchannels available for random competition, STA2 will The first backoff value is subtracted by 6 (ie, the second number) to obtain the third backoff value (1). Since the third backoff value is greater than 0, the STA2 backoff is not completed, and the uplink data cannot be selected from the idle channel. DATA-2 (ie packet).

Further, for STA2, the trigger frame sent by the access point may be received again, for example, TF-2, and after receiving the TF-2, STA2 has a first backoff value of 5, and then performs physical carrier sensing. STA2 hears that both channel 1 and channel 2 are idle. Since TF-2 indicates that there are 6 subchannels on channel 1 and channel 2 that can be used for contention at any time, STA2 subtracts 6 from the first backoff value. The second number is obtained to obtain the third backoff value, and the third backoff value is less than 0. Therefore, STA2 can randomly select at least one subchannel from the idle channel (channel 1 and channel 2) to transmit the uplink data DATA-2.

It should be noted that whether the channel detected by STA1 is idle is not necessarily related to the channel idleness detected by STA2, and the two are independent of each other. In addition, there is no necessary relationship between TF-1 and TF-2, and the two are independent of each other. This embodiment is described by taking the same TF-1 and TF-2 as an example. Of course, it is not limited to this, TF -1 and TF-2 can be different.

In another specific implementation manner of the first embodiment of the present invention, based on the technical solution of the first embodiment of the present invention, in the contention access method provided in Embodiment 4 of the present invention, if the channel is idle The allocation information includes subchannels for contention and allocated to the station;

Then, in step S203, according to the allocation information of the idle channel, selecting at least one subchannel from the idle channel, and transmitting the data packet through the selected at least one subchannel is:

According to the idle channel allocation information, a subchannel for contention and allocated to the station is selected from the idle channel to transmit the data packet.

In this embodiment, for example, the description includes two channel identifiers in the trigger frame as an example, specifically including: channel 1 and channel 2, and dividing each channel into 4 subchannels, and subchannels of each channel are The next time is sub-channel 1-4, wherein the allocation information corresponding to each channel identifier of the trigger frame is that 4 subchannels of channel 1 can be used for random competition, and subchannel 1 and subchannel 2 of channel 2 can be used for random competition. And subchannel 1 of channel 2 is allocated to STA1. It can be understood that the subchannel allocated to the station may also be allocated to STA2, and the invention is not limited thereto.

Specifically, if the station is STA1, the STA1 receives the triggering frame, for example, TF-1, and the channel 1 is busy, and the channel 2 is idle, because the subchannel 1 of the channel 2 is allocated in the TF-1. To STA1, therefore, according to the idle channel allocation information, STA1 selects subchannel 1 of channel 2 from the idle channel 2 to transmit uplink data DATA-1 (i.e., a data packet).

If the STA2 is the STA2, the STA2 is aware that the channel 1 is busy, and the channel 2 is idle. The STA2 can use the contention access mode of the second embodiment and the third embodiment to select the subchannel to transmit the subchannel. In this embodiment, the embodiment is used. The contention access method of the third is described as an example. Since the allocation information corresponding to the TF-1 channel identifier is that there are 6 subchannels on the channel 1 and the channel 2, which can be used for random competition, STA2 subtracts 6 from the first backoff value. The second number is obtained to obtain the third backoff value (1). Since the third backoff value is greater than 0, the STA2 backoff is not completed, and the uplink data DATA-2 cannot be transmitted by selecting the subchannel from the idle channel.

Further, for STA2, the trigger frame sent by the access point may be received again, for example, TF-2, and after receiving the TF-2, STA2 has a first backoff value of 5, and then performs physical carrier sensing. STA2 hears that both channel 1 and channel 2 are idle. Since TF-2 indicates that there are 6 subchannels on channel 1 and channel 2 that can be used for contention at any time, STA2 subtracts 6 from the first backoff value. a second number) to obtain a third backoff value, and the third backoff value is less than 0, therefore, After STA2, the uplink data DATA-2 can be transmitted by randomly selecting a subchannel from the idle channels (channel 1 and channel 2).

In another specific implementation manner of the first embodiment of the present invention, the contention access method provided by the fifth embodiment of the present invention further includes the following steps:

It is judged whether there is a subchannel for competition and allocated to the station in the trigger frame, and if so, it is determined whether the existing channel for contention and the subchannel allocated to the station belongs to is a free channel.

Step S203 includes: if it is determined that the existing channel for the contention and the subchannel to which the station belongs is not the idle channel, according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame, Perform backoff processing.

In this embodiment, for example, the description includes two channel identifiers in the trigger frame as an example, specifically including: channel 1 and channel 2, and dividing each channel into four subchannels, and the sub-number of each channel is from The next time is sub-channel 1-4, wherein the allocation information corresponding to each channel identifier of the trigger frame is that 4 subchannels of channel 1 can be used for random competition, and subchannel 1 and subchannel 2 of channel 2 can be used for random competition. And subchannel 1 of channel 2 is allocated to STA1. Of course, it is not limited to this. The trigger frame may include multiple channel identifiers, and the corresponding allocation information of each channel identifier is not limited thereto.

Specifically, FIG. 7 is a schematic diagram of Embodiment 5 of a contention access method according to an embodiment of the present invention. As shown in FIG. 7, if a station is STA1, STA1 receives an access point to send the trigger frame, for example, TF-1, and detects It is heard that channel 1 is idle and channel 2 is busy. Although the subchannel of channel 2 in TF-1 is allocated to STA1 for transmitting data packets, at this time, STA1 hears that channel 2 is busy, STA1 cannot The data packet is transmitted on the channel 2, and the contention access method in the second embodiment or the third embodiment is used for the random competition. This embodiment uses the contention access method in the third embodiment as an example, that is, the channel in the TF-1. The corresponding allocation information is that a total of six subchannels on channel 1 and channel 2 can be used for random competition. Therefore, STA1 reduces the first backoff value by 6 (ie, the second number) to obtain a third backoff value, and the third backoff. The value is less than or equal to 0. Therefore, STA1 can select at least one subchannel from the idle channel (channel 1), for example, select subchannel 1 to transmit an uplink packet, or select subchannel 1 and subchannel 2, and pass subchannel 1 and sub Channel 2 to send uplink According DATA-1 (i.e. The data packet), it should be noted that FIG. 7 is an example in which the subchannel 1 is selected as an example.

If the station is STA2, STA2 detects that channel 1 is busy and channel 2 is idle. Since the allocation information corresponding to the TF-1 channel identifier is that channel 1 and channel 2 have 6 subchannels available for random competition, STA2 will The first backoff value is subtracted by 6 (ie, the second number) to obtain a third backoff value (1). Since the third backoff value is greater than 0, the STA2 backoff is not completed, and the subchannel cannot be selected from the idle channel. Upstream data DATA-2.

Further, for STA2, the trigger frame sent by the access point may be received again, for example, TF-2, and after receiving the TF-2, STA2 has a first backoff value of 5, and then performs physical carrier sensing. STA2 hears that both channel 1 and channel 2 are idle. Since TF-2 indicates that there are 6 subchannels on channel 1 and channel 2 that can be used for contention at any time, STA2 subtracts 6 from the first backoff value. The second number is obtained to obtain the third backoff value, and the third backoff value is less than 0. Therefore, STA2 can randomly select the subchannel to transmit the uplink data DATA-2 from the idle channels (channel 1 and channel 2).

In another specific implementation manner of the first embodiment of the present invention, the contention access method provided by the sixth embodiment of the present invention further includes the following steps:

Step S203 includes: if it is determined that the existing channel for contention and the subchannel allocated to the station belongs to the channel that is not the idle channel, select at least one subchannel from the idle channel according to the allocation information of the idle channel, and select At least one subchannel transmits a data packet.

Specifically, FIG. 8 is a schematic diagram of Embodiment 6 of a contention access method according to an embodiment of the present invention. As shown in FIG. 8, if a station is STA1, STA1 receives an access point to send the trigger frame, for example, TF-1, and detects It is heard that channel 1 is idle and channel 2 is busy. Although the subchannel of channel 2 in TF-1 is allocated to STA1 for transmitting data packets, at this time, STA1 hears that channel 2 is busy, STA1 cannot The data packet is transmitted on channel 2. Therefore, STA1 can select at least one subchannel from the idle channel (channel 1), for example, select subchannel 1 to transmit an uplink data packet, or select subchannel 1 and subchannel 2, and pass subchannel 1 And the subchannel 2 transmits the uplink data DATA-1 (that is, the data packet). It should be noted that FIG. 8 is an example in which the subchannel 1 is selected as an example.

If the STA2 is the STA2, the STA2 is aware that the channel 1 is busy, and the channel 2 is idle. The STA2 can use the contention access method of the second embodiment or the third embodiment to perform random competition. In this embodiment, the content of the third embodiment is competitive. The access mode is described as an example. Specifically, since the allocation information corresponding to the TF-1 channel identifier is that a total of six subchannels on the channel 1 and the channel 2 can be used for random competition, STA2 subtracts 6 from the first backoff value. The second number is obtained to obtain the third backoff value (1). Since the third backoff value is greater than 0, the STA2 backoff is not completed, and the uplink data DATA-2 cannot be transmitted by selecting the subchannel from the idle channel.

FIG. 9 is a schematic structural diagram of Embodiment 1 of a contention access device according to an embodiment of the present invention; as shown in FIG. 9, the contention access device provided in this embodiment includes: a transceiver module 901, a listening module 902, and processing. Module 903.

In this embodiment, the transceiver module 901 is configured to receive a trigger frame sent by the access point; specifically, The triggering frame 902 includes: the channel identifier and the channel identifier corresponding to the allocation information; the listening module 902 is configured to listen to whether the channel corresponding to the channel identifier is idle; and the processing module 903 is configured to: if the listening module 902 detects that there is a free channel, Selecting at least one subchannel from the idle channel according to the allocation information of the idle channel, and triggering the transceiver module to send the data packet through the selected at least one subchannel subchannel; or according to the allocation information corresponding to the idle channel or the channel identifier included in the trigger frame The corresponding allocation information is subjected to backoff processing.

The contention access device in this embodiment may be a site, and may implement the technical solution of the method embodiment of FIG. 2, and the implementation principles thereof are similar, and details are not described herein again.

In the contention access device provided by the embodiment of the present invention, the triggering frame sent by the access point received by the transceiver module is used, and the listening module detects whether the channel corresponding to the channel identifier is idle, and the processing module detects that the channel is idle in the listening module. And selecting at least one subchannel from the idle channel according to the allocation information of the idle channel, and triggering the transceiver module to send the data packet through the selected at least one subchannel subchannel, or according to the idle channel and the channel identifier included in the trigger frame. Allocating information, performing backoff processing, first determining whether the channel corresponding to the channel identifier is an idle channel, and then selecting at least one subchannel from the available idle channels, or corresponding to the allocation information corresponding to the idle channel or the channel identifier included in the trigger frame. The allocation information is subjected to the backoff processing. Therefore, it is ensured that once a subchannel is selected, it is necessarily a subchannel in the idle channel, thereby avoiding the problem that the channel of the subchannel randomly selected by the station is busy in the prior art. Reduce the efficiency of uplink access, thereby reducing network performance Problems, thereby effectively improving the efficiency of uplink access the site, and improving network performance.

Further, based on the technical solution of the first embodiment, in the second embodiment of the contention access device provided by the present invention, FIG. 10 is a schematic structural diagram of Embodiment 2 of the contention access device according to the embodiment of the present invention. As shown in FIG. 10, if the allocation information of the idle channel includes a subchannel for contention, the processing module 903 includes: a first backoff unit 101 and a first judging unit 102.

In this embodiment, the first backoff unit 101 is configured to: after the first backoff value is subtracted from the first backoff value, the second backoff value is obtained according to the allocation information corresponding to the idle channel; the first determining unit 102 is configured to determine the second Whether the backoff value is less than or equal to 0, if the second backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transceiver module to send the data packet through the selected at least one subchannel; wherein, the first backoff value It is a backoff value when the station receives the trigger frame, and the first number of allocation information of the idle channel includes the number of subchannels for contention.

In addition, in this embodiment, if the second backoff value is greater than 0, the backoff is not completed, and the number of transmissions is not completed. According to the package.

The contention access device in this embodiment may be a site, and may implement the technical solution of the method embodiment of FIG. 3, and the implementation principles thereof are similar, and details are not described herein again.

Further, on the basis of the technical solution of the first embodiment of the contention access device, in the third embodiment of the contention access device provided by the present invention, FIG. 11 is an embodiment of a contention access device according to an embodiment of the present invention. As shown in FIG. 11, if the allocation information corresponding to the channel identifier includes a subchannel for contention, the processing module 903 includes: a second backoff unit 111 and a second judging unit 112.

In this embodiment, the second backoff unit 111 is configured to: according to the allocation information corresponding to the channel identifier included in the trigger frame, subtract the second backoff value from the second backoff value to obtain a third backoff value; the second determining unit 112, For determining whether the third backoff value is less than or equal to 0, if the third backoff value is less than or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transceiver module to send the data packet through the selected at least one subchannel; The first backoff value is a backoff value when the station receives the trigger frame, and the second number triggers the total number of all the subchannels used for contention included in the frame.

Further, in the present embodiment, if the third backoff value is greater than 0, the backoff is not completed, and the data packet is not transmitted.

The contention access device in this embodiment may be a site, and may implement the technical solution of the method embodiment in FIG. 5, and the implementation principles thereof are similar, and details are not described herein again.

Further, based on the technical solution of the first embodiment of the contention access device, in the fourth embodiment of the contention access device provided by the present invention, the method includes: if the allocation information of the idle channel includes content for contention, and And the processing module is configured to: select, according to the idle channel allocation information, a subchannel for contention and allocated to the contention access device from the idle channel, and trigger the transceiver module to select A sub-channel for contention and assigned to a contention access device transmits a data packet.

The contending access device in this embodiment may be a site, and may implement the technical solution of the embodiment of the method in the fourth embodiment of the method, and the implementation principle thereof is similar, and details are not described herein again.

Further, on the basis of the technical solution of the first embodiment of the contention access device, in the fifth embodiment of the contention access device provided by the present invention, the processing module is further configured to determine whether there is a contention for the competition in the trigger frame. And the subchannel allocated to the contention access device, if yes, determining whether the existing channel for the contention and the subchannel allocated to the contention access device belongs to the idle channel; If the channel to which the subchannel that is used for the contention and is allocated to the contention access device is not the idle channel, the backoff processing is performed according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame. .

The contention access device in this embodiment may be a site, and may implement the technical solution of the method embodiment in FIG. 7. The implementation principle is similar, and details are not described herein again.

Further, on the basis of the technical solution of the first embodiment of the contention access device, in the sixth embodiment of the contention access device provided by the present invention, the processing module is further configured to determine whether there is a contention for triggering in the trigger frame. And the subchannel allocated to the contention access device, if yes, determining whether the existing channel for the contention and the subchannel allocated to the contention access device belongs to the idle channel; if it is determined that there is competition for existence And the channel to which the subchannel allocated to the contention access device belongs is not an idle channel, and at least one subchannel is selected from the idle channel according to the allocation information of the idle channel, and the data packet is transmitted through the selected at least one subchannel.

The contention access device in this embodiment may be a site, and may implement the technical solution of the method embodiment of FIG. 8. The implementation principle is similar, and details are not described herein again.

FIG. 12 is a schematic structural diagram of a site according to an embodiment of the present invention; as shown in FIG. 12, the site provided by the embodiment includes: a receiver 121, a processor 122, and a transmitter 123.

In this embodiment, the receiver 121 is configured to receive a trigger frame sent by the access point, where the trigger frame includes the channel identifier and the allocation information corresponding to the channel identifier, and the processor 122 is configured to: listen to whether the channel corresponding to the channel identifier is idle. The processor 122 is further configured to: if the idle channel is detected, select at least one subchannel from the idle channel according to the allocation information of the idle channel, and trigger the transmitter 123 to send the data packet by using the selected at least one subchannel; The backoff process is performed according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame.

Further, on the basis of the technical solution of the first embodiment of the site, in the second embodiment of the site provided by the present invention, if the allocation information of the idle channel includes a subchannel for contention, the processor 122 is specifically configured to: Determining, according to the allocation information corresponding to the idle channel, the first backoff value by the first number, obtaining the second backoff value; determining whether the second backoff value is less than or equal to 0, and if the second backoff value is less than or equal to 0, the slave idle channel Selecting at least one subchannel, and triggering the transmitter to send the data packet by using the selected at least one subchannel; wherein, the first backoff value is a backoff value when the station receives the trigger frame, and the first quantity is included in the allocation information of the idle channel. The number of subchannels used for contention.

Further, on the basis of the technical solution of the first embodiment of the site, in the third embodiment of the site provided by the present invention, if the allocation information corresponding to the channel identifier includes a subchannel for contention, the processor 122 further The method is: using the allocation information corresponding to the channel identifier included in the trigger frame, subtracting the second backoff value from the second backoff value, and acquiring the third backoff value; determining whether the third backoff value is less than or equal to 0, if the third backoff value is less than Or equal to 0, selecting at least one subchannel from the idle channel, and triggering the transmitter to send the data packet through the selected at least one subchannel; wherein the first backoff value is a backoff value when the station receives the trigger frame, The total number of all subchannels used for contention included in the two number trigger frame.

In addition, in this embodiment, if the third backoff value is greater than 0, the backoff is not completed, and the data packet is not transmitted.

Further, on the basis of the technical solution of the first embodiment of the site, in the fourth embodiment of the site provided by the present invention, if the allocation information of the idle channel includes a subchannel for contention and allocated to the station, The processor 122 is specifically configured to: select, according to the idle channel allocation information, a subchannel for contention and allocated to the station from the idle channel, and trigger the transmitter to pass the selected subchannel for contention and allocated to the station. Send a packet.

Further, on the basis of the technical solution of the first embodiment of the site, in the fifth embodiment of the site provided by the present invention, the processor 122 is further configured to: determine whether there is a contention for the competition in the trigger frame, and allocate the site to the site. If there is a subchannel, if it exists, it is determined whether the existing channel used for contention and allocated to the subchannel of the station belongs to the idle channel; if it is determined that the subchannel reserved for the competition and allocated to the station belongs to If the channel is not an idle channel, the backoff process is performed according to the allocation information corresponding to the idle channel or the allocation information corresponding to the channel identifier included in the trigger frame.

Further, on the basis of the technical solution of the first embodiment of the site, in the sixth embodiment of the site provided by the present invention, the processor 122 is further configured to: determine whether there is a contention for the competition in the trigger frame, and allocate the site to the site. If there is a subchannel, if it exists, it is determined whether the existing channel used for contention and allocated to the subchannel of the station belongs to the idle channel; if it is determined that the subchannel reserved for the competition and allocated to the station belongs to The channel is not an idle channel, and at least one subchannel is selected from the idle channel according to the allocation information of the idle channel, and the data packet is transmitted through the selected at least one subchannel.

FIG. 13 is a schematic structural diagram of a contention access system according to an embodiment of the present invention; as shown in FIG. 13, the contention access system provided in this embodiment includes: an access point 131 and a site 132.

The site in this embodiment is the contention access device of any of FIG. 9 to FIG. 11, and the implementation principles are similar, and details are not described herein again.

Example 7:

Referring to FIG. 14, the embodiment sends a trigger frame for an access point, where a part of the subchannels are allocated to the scheduled station, and another part of the subchannels is used for random access, but the scheduled station is detected by interception. A scenario in which the subchannels allocated to itself are in a busy state. The scheduled station listens to the allocated subchannel, which is usually obtained by listening to the state of the channel where the allocated subchannel is located. When the station detects that a certain channel is busy, all subchannels included in the channel are busy. status. Conversely, when a station detects that a channel is in an idle state, all subchannels included in the channel are idle. The interception based on the state of the channel is simple to implement, and avoids the high complexity caused by the separate listening of each subchannel.

The contention access method provided in Embodiment 7 of the present invention specifically includes the following steps:

The access point sends a trigger frame, which allocates a part of the subchannels to the scheduled station, and uses another part of the subchannels for random competition;

The station receives the trigger frame, and determines whether it is a scheduled station according to the trigger frame;

If it is judged that it is a scheduled station, it listens to the state of the scheduled subchannel. When the scheduled subchannel state is idle, the data is transmitted on the scheduled subchannel; when the scheduled subchannel is busy, it is further determined whether There are idle subchannels for random contention, and if there are idle random competing subchannels, one of the following methods is performed:

Manner 1: randomly select an idle random competing subchannel for data transmission;

Manner 2: first perform backoff, that is, subtract the idle number of subchannels for random competition by using the backoff counter value, and if the updated backoff counter value is 0 or a negative number, randomly select an idle random competing subchannel for data. send;

Manner 3: First, the backoff is performed, that is, the number of subchannels used for random competition is subtracted by the backoff counter value. If the updated backoff counter value is 0 or a negative number, an idle random competing subchannel is randomly selected for data transmission.

In the first mode, the scheduled station does not perform backoff and directly selects the random contention subchannel for data transmission, and the scheduled station is given a higher priority than the random competition site. This way, the scheduled site has more data transmission opportunities. But when there are a large number of scheduled sites that are tuned When the subchannel is in a busy state, a serious collision occurs due to a large number of stations transmitting in a limited random competing subchannel at the same time. A method for controlling conflicts is to limit the site of the execution mode 1. For example, only sites belonging to a specific access type or high priority can use the mode one for access, and for example, the access point can be in the trigger frame. The dispatching station of the first mode can be instructed to prevent the conflict of the scheduling site of the first execution mode 1 from being excessive.

The following is a more specific example based on Figure 14. It is assumed that the access point sends a trigger frame indicating that there are two channels available for data transmission: channel 1 and channel 2, each channel being divided into 4 subchannels. The trigger frame uses 4 subchannels in channel 1 for random contention, and subchannel 1 and subchannel 2 in channel 2 are also used for random contention, and subchannel 3 and subchannel 4 in channel 2 are allocated to scheduling users, for example Subchannel 4 of channel 2 is assigned to station 1.

After receiving the trigger frame, the station 1 first learns that it is scheduled to transmit to the subchannel 4 of the channel 2 according to the scheduling information in the trigger frame. At this time, the station 1 will decide how to transmit data according to the channel conditions of the subchannels scheduled by itself and the random access subchannel. As shown in FIG. 14, channel 2 is in a busy state, so subchannel 4 of channel 2 is also in a busy state, and data transmission on subchannel 4 of channel 2 is not possible at this time. Further, the station 1 determines whether there is an idle random contention subchannel, and as shown in FIG. 14, the four randomly-contiguous subchannels of the channel 1 are in an idle state, and at this time, the station one can perform one of the following modes:

Manner 1: Select one of the four random competing subchannels in channel 1 for data transmission;

Manner 2: first perform backoff, that is, subtract the idle number of subchannels for random competition by using the backoff counter value. If the value of the backoff counter before updating is less than or equal to 4, the value of the backoff counter after updating is 0 or a negative number, and thus Select one of the four random competing subchannels in channel 1 for data transmission; if the value of the backoff counter before the update is greater than 4, the value of the backoff counter after updating is greater than 0, and data transmission cannot be performed;

Manner 2: first perform backoff, that is, subtract the number of subchannels used for random competition by using the backoff counter value. If the value of the backoff counter before the update is less than or equal to 6, the value of the backoff counter after updating is 0 or a negative number, and thus the channel can be One of the four random competing subchannels in 1 is selected for data transmission; if the value of the backoff counter before the update is greater than 6, the value of the backoff counter after the update is greater than 0, and the data cannot be transmitted.

Referring to FIG. 15, a seventh embodiment of the present invention provides a communication method applied to a wireless local area network, including:

S701: The station receives a trigger frame sent by the access point; the trigger frame indicates that a part of the subchannel is a subchannel allocated for the scheduled station, and another part of the subchannel is a subchannel for random access;

S702: If the station is a scheduled station, listen to whether the subchannel allocated to the station is busy;

S703: If the subchannel allocated to the station is busy, randomly select an idle random access subchannel for data transmission, or perform backoff first, and then randomly select an idle random access subchannel for data transmission after the backoff is completed.

Specifically, the manner of performing backoff is: subtracting the number of idle subchannels for random access by using the backoff counter value, and if the updated backoff counter value is 0 or a negative number, the backoff ends; or using the backoff counter The value is subtracted from the number of subchannels used for random access. If the updated backoff counter value is 0 or a negative number, the backoff ends.

Specifically, the station knows whether the subchannel allocated to the station is busy by listening to the state of the channel where the allocated subchannel is located, and when the station detects that one channel is in a busy state, all the subchannels are included in the channel. The channel is in a busy state; when the station detects that a channel is in an idle state, all subchannels included in the channel are idle.

Referring to FIG. 12, a seventh embodiment of the present invention discloses a station, including:

The receiver 121 is configured to receive a trigger frame sent by the access point, where the trigger frame indicates that a part of the subchannel is a subchannel for allocation to the scheduled station, and another part of the subchannel is a subchannel for random access;

The processor 122 is configured to determine, according to the trigger frame, whether the site is a scheduled site, and listen to whether a subchannel allocated to the site is busy; and the processor 122 is further configured to allocate to the site When the channel is busy, an idle random access subchannel is randomly selected for data transmission; or when the subchannel allocated to the station is busy, the backoff is performed first, and after the backoff is ended, an idle random access sub is randomly selected. Channel for data transmission; and

The transmitter 123 is configured to transmit data on the allocated subchannel or send data on the subchannel that is contending.

The manner in which the processor 122 performs backoff is specifically: subtracting the number of idle subchannels for random access by using the backoff counter value, and if the updated backoff counter value is 0 or a negative number, the backoff ends; or using backoff The counter value is subtracted from the number of subchannels used for random access. If the updated backoff counter value is 0 or a negative number, the backoff ends.

One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that Modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A communication method applied to a wireless local area network, the method comprising:

The station receives a trigger frame sent by the access point; the trigger frame indicates that a part of the subchannel is a subchannel for allocation to the scheduled station, and another part of the subchannel is a subchannel for random access;

If the site is a scheduled site, listen to whether the subchannel assigned to the site is busy;

If the subchannel allocated to the station is busy, randomly select an idle random access subchannel for data transmission, or perform backoff first, and then randomly select an idle random access subchannel for data transmission after the backoff is completed.
The method according to claim 1, wherein the manner of performing backoff is specifically: subtracting the number of idle subchannels for random access by using a backoff counter value, if the updated backoff counter value is 0. Or a negative number, the backoff ends.
The method according to claim 1, wherein the manner of performing backoff is specifically: subtracting the number of subchannels used for random access by using a backoff counter value, if the updated backoff counter value is 0 or a negative number , the end of the retreat.
The method according to any one of claims 1 to 3, wherein the station knows whether the subchannel allocated to the station is busy by listening to the state of the channel in which the allocated subchannel is located, when the station listens When a channel is busy, all subchannels included in the channel are busy; when the station detects that a channel is in an idle state, all subchannels included in the channel are idle.
A site characterized in that it comprises:

a receiver, configured to receive a trigger frame sent by the access point; the trigger frame indicates that a part of the subchannel is a subchannel for allocation to the scheduled station, and another part of the subchannel is a subchannel for random access;

a processor, configured to determine, according to the trigger frame, whether the site is a scheduled site, and listen to whether a subchannel allocated to the site is busy;

The processor is further configured to: when the subchannel allocated to the station is busy, randomly select an idle random access subchannel for data transmission; or to perform backoff when the subchannel allocated to the station is busy After the end of the backoff, an idle random access subchannel is randomly selected for data transmission.
The station according to claim 5, wherein the manner in which the processor performs backoff is specifically: subtracting the number of idle subchannels for random access by using a backoff counter value, if the updated backoff counter value If it is 0 or a negative number, the backoff ends.
The station according to claim 5, wherein the manner in which the processor performs backoff is specifically: subtracting the number of subchannels used for random access by using a backoff counter value, if the updated backoff counter value is 0. Or a negative number, the backoff ends.
The station according to any one of claims 5 to 7, wherein the station knows whether the subchannel allocated to the station is busy by listening to the state of the channel in which the allocated subchannel is located, when the station is listening. When a channel is busy, all subchannels included in the channel are busy; when the station detects that a channel is in an idle state, all subchannels included in the channel are idle.