CN108633030A - Channel access method and device - Google Patents

Abstract

The present invention provides a channel access method and device, wherein the method includes: the first access point AP receives the characteristic information of all the second APs that have accessed the available channels; The above-mentioned first AP is an access point to be connected to the above-mentioned available channel, which solves the problem that the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access. Channels that are occupied or seriously occupied are backed off to achieve the purpose of making full use of limited channel resources.

Description

Channel access method and device

technical field

The present invention relates to the technical field of wireless local area networks, in particular to a channel access method and device.

Background technique

With the rapid development of WLAN technology, more and more WLAN access points (APs) are used, the layout becomes denser, and channel overlap becomes more and more serious. Currently, the AutoChannel Selection technology is widely used, which can alleviate the Wi-Fi signal interference problem caused by channel overlap to a certain extent. However, in some actual scenarios, the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access.

For example: Scenario 1, as shown in Figure 1, there are 4 2.4G frequency band APs deployed in this area, among which AP1, AP2, AP3, and AP4 can be detected from each other. For example, AP1 is associated with STA (Station, wireless terminal) 1, and there is Wi-Fi service on channel 1; AP2 automatically selects channel 6, without STA association; AP3 automatically selects channel 11, without STA association. Automatic channel selection is performed when the AP4 starts up. AP4 is closer to AP2 and AP3, and farther away from AP1, so the AP detects that the signal of AP1 is weak. When other factors are consistent, the channel 1 is calculated according to the RSSI factor. Select to channel 1. If STA2 is associated with AP4 at this time, then on channel 1, there are two APs associated with STA at the same time, and when both have Wi-Fi services, there will be interference between each other and the experience is poor, while channel 6 and channel 11 are If it is idle, the channel utilization is poor.

Scenario 2, the situation of AP signals in a certain area scanned by Wi-Fi signal scanning software, very dense distribution of APs in the 2.4G frequency band. Suppose these APs are all "idle" (that is, no STA is associated), and they are all configured as automatic channels. In this environment, an AP is re-started, and STAs are associated and have Wi-Fi services. At this time, it is found that no matter which channel the newly-started AP chooses, the interference is very serious and the rate is very low, and it is these "idle APs" that cause interference. "AP management frames and control frames lead to a serious waste of channel resources in this area.

To sum up, in some practical scenarios, no effective solution has been proposed for the problem that the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access.

Contents of the invention

The present invention provides a channel access method and device to at least solve the problem that the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access.

According to one aspect of the present invention, a channel access method is provided, including:

The first access point AP receives feature information of all second APs that have accessed available channels;

A channel with the lowest utilization rate is selected for access according to the received feature information, wherein the first AP is an access point to access the available channel.

Further, the feature information received by the first access point AP of all the second APs that have accessed available channels includes:

The first access point AP receives the Beacon frames sent by all the second APs that have accessed the available channels, wherein the Beacon frames are encapsulated into the characteristic information of the second APs;

The foregoing Beacon frame is parsed to obtain all characteristic information of the foregoing second AP.

Further, selecting the channel with the lowest utilization rate for accessing according to the received characteristic information includes:

Acquiring channel usage information of each available channel according to the received characteristic information;

The channel usage information of all the above available channels is compared, and the channel with the lowest utilization rate is selected for access.

Further, obtaining the channel usage information of each of the available channels according to the received characteristic information includes:

For each of the above-mentioned available channels, according to the type of the above-mentioned available channels, store the feature information sent by all the above-mentioned second APs accessing the current type of available channels in a linked list, wherein the above-mentioned linked list is obtained by parsing the above-mentioned Beacon frame BSSID is constructed as an index value;

The above-mentioned feature information in the above-mentioned linked list is weighted and calculated to obtain the channel usage information of the above-mentioned available channels.

Further, the feature information includes at least one of the following: working channel information of the second AP, information about the number of associated wireless terminals of the second AP, real-time traffic information of the second AP, and use priority information of the second AP .

According to another aspect of the present invention, a channel access method is provided, including:

The second access point AP sends its own feature information to the first AP, so that the first AP selects the channel with the lowest utilization rate among the available channels according to the feature information to access; wherein, the first AP is a standby The access point that has accessed the above-mentioned available channel, and the above-mentioned second AP is an access point that has accessed the above-mentioned available channel.

Further, the above-mentioned second AP sending its own characteristic information to the first AP includes:

The above-mentioned second AP encapsulates its own characteristic information into the Beacon frame to be sent to the above-mentioned first AP;

Send the above-mentioned encapsulated Beacon frame to the above-mentioned first AP.

Further, making the above-mentioned first AP select the channel with the lowest utilization rate to access according to the above-mentioned feature information includes:

so that the above-mentioned first AP stores the feature information sent by all the above-mentioned second APs that access the currently available channel type in a linked list according to the type of the above-mentioned available channel, wherein the above-mentioned linked list is obtained by parsing the above-mentioned Beacon frame. BSSID as constructed from the index value;

so that the first AP performs weighted calculation on the above-mentioned feature information in the above-mentioned linked list to obtain the channel usage information of the above-mentioned currently available channel;

The above-mentioned first AP compares the channel usage information of all the above-mentioned available channels, and selects the channel with the lowest utilization rate for access.

Further, the feature information includes at least one of the following: working channel information of the second AP, information about the number of associated wireless terminals of the second AP, real-time traffic information of the second AP, and usage priority information of the second AP .

According to another aspect of the present invention, a channel access device is provided, which is applied to a first access point AP, and is characterized in that it includes:

A receiving module, configured to receive feature information of all second APs that have accessed available channels;

A selection module, configured to select a channel with the lowest utilization rate for access according to the received feature information, wherein the first AP is an access point to access the available channel.

Further, the above receiving module includes:

The receiving unit is configured to receive Beacon frames sent by all second APs that have accessed available channels, wherein the above Beacon frames have been encapsulated into the characteristic information of the above second AP;

The parsing unit is configured to parse the aforementioned Beacon frame to obtain all the characteristic information of the aforementioned second AP.

Further, the above selection module includes:

An obtaining unit, configured to obtain channel usage information of each of the above available channels according to the received above characteristic information;

The selection unit is configured to compare the channel usage information of all the above available channels, and select the channel with the lowest utilization rate for access.

Further, the above acquisition unit includes:

The storage subunit is configured to store the characteristic information sent by all the above-mentioned second APs that access the currently available channel type in a linked list according to the type of the above-mentioned available channel, wherein the above-mentioned linked list is obtained by parsing the above-mentioned Beacon frame. BSSID as constructed from the index value;

The calculation subunit is configured to perform weighted calculation on the above-mentioned feature information in the above-mentioned linked list to obtain the channel usage information of the above-mentioned currently available channels.

According to another aspect of the present invention, a channel access device is provided, which is applied to a second access point AP, and is characterized in that it includes:

The sending module is configured to send its own feature information to the first AP, so that the first AP selects a channel with the lowest utilization rate among the available channels according to the feature information to access; wherein, the first AP is to be accessed The above-mentioned access point of the available channel, the above-mentioned second AP is an access point that has accessed the above-mentioned available channel.

According to the present invention, the first access point AP receives the characteristic information of all the second APs that have accessed the available channels; according to the received characteristic information, the channel with the lowest utilization rate is selected for access, wherein the first AP is to be The access points that access the above-mentioned available channels solve the problem that the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access, and back off the currently occupied or seriously occupied channels to achieve The purpose of making full use of limited channel resources.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Figure 1 is the first wireless LAN scenario;

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

Fig. 3 is a flowchart of a channel access method according to an example of the present invention;

Fig. 4 is a structural block diagram of a channel access device according to an embodiment of the present invention;

FIG. 5 is a structural block diagram of a receiving module 42 of a channel access device according to an embodiment of the present invention;

FIG. 6 is a structural block diagram of a channel access device selection module 44 according to an embodiment of the present invention;

FIG. 7 is a structural block diagram of a channel access device acquisition unit 442 according to an embodiment of the present invention;

Fig. 8 is a structural block diagram of a channel access device according to another embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

Embodiment one:

A channel access method is provided in this embodiment. FIG. 2 is a flowchart of a channel access method according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, the first access point AP receives feature information of all second APs that have accessed available channels;

In this step, the first access point AP is an access point to access available channels, and receiving the characteristic information of all second APs that have accessed available channels includes: the first access point AP receiving Beacon frames sent by all the second APs in the channel, wherein the Beacon frames have encapsulated the feature information of the second APs; analyzing the Beacon frames to obtain the feature information of all the second APs.

When the current AP (the first AP) has no STA association, set the timer TimerA to perform automatic channel series operations at regular intervals; when the current AP has STA association, automatic channel selection is not performed; when TimerA is running, in the Beacon frame information of the AP The addition can be a field such as the field ACS. The newly added field includes the following characteristic information: the current AP working channel, the number of current AP associated STAs (Associated Stations), the real-time traffic of the AP for a period of time, and the priority of the AP use. The timer of the automatic channel regularly updates the field information (that is, feature information) to the Beacon frame information; when Timer A is running, the AP scans for signals on all available channels.

Step S204, selecting a channel with the lowest utilization rate for access according to the received feature information, wherein the first AP is an access point to access the available channel.

In this step, selecting the channel with the lowest utilization rate to access according to the received characteristic information includes: obtaining the channel usage information of each of the above available channels according to the received characteristic information; comparing the channel usage information of all the above available channels information, select the channel with the lowest utilization rate for access. Obtaining the channel usage information of each of the above available channels according to the received above characteristic information includes: for each of the above available channels, according to the type of the above available channels, all the above second APs that access the current type of available channels send The feature information is stored in a linked list, wherein the above-mentioned linked list is constructed with the BSSID (Basic Service Set identification, basic service set identification information) obtained by parsing the above-mentioned Beacon frame as an index value; the above-mentioned feature information in the above-mentioned linked list is weighted Calculate and obtain the channel usage information of the above available channels. The feature information includes at least one of the following: working channel information of the second AP, information about the number of associated wireless terminals of the second AP, real-time traffic information of the second AP, and usage priority information of the second AP.

The first AP performs information analysis on the received Beacon frame sent by the second AP, uses the analyzed BSSID as an index value, constructs a linked list, and stores the following characteristic information carried in the Beacon frame into the linked list: current channel (Channel), Signal strength (RSSI), current number of AP-associated STAs (Associated Stations), AP real-time traffic (NetworkTraffic) for a period of time, AP priority (Priority), etc., perform weighted calculations on these characteristic information in the linked list to obtain the above available channels channel usage information for .

In the method used in the embodiment of the present invention, the first access point AP receives the characteristic information of all the second APs that have accessed the available channels; according to the received characteristic information, the channel with the lowest utilization rate is selected for access, wherein the above The first AP is an access point to be accessed to the above available channel. It solves the problem that the current general automatic channel selection technology cannot accurately select the channel with the lowest utilization rate for access, and back off the currently occupied or seriously occupied channels to achieve the purpose of making full use of limited channel resources.

Embodiment two:

Based on the technical solution of the above embodiment, the above technical solution will be described in detail below in conjunction with an embodiment.

A method for channel access is provided in this embodiment. FIG. 3 is a flow chart of a channel access method according to an example of the present invention. As shown in FIG. 3 , the process includes the following steps:

S302: When setting the timer to start, when the first AP has no STA association;

S304: Judging whether the current channel to be accessed is idle according to whether the second AP on each channel currently to be accessed is associated with an STA, if a channel is currently idle, then proceed to S312 to select the current idle channel to access;

S306: If there is currently a channel that is not idle, scan to obtain AP information on all channels, including but not limited to: RSSI, background noise, channel traffic information, etc.;

S308: Calculate and organize the channel information obtained by scanning.

For example, for channel N to be accessed, the number of accessed APs scanned is M. The corresponding interference value of AP{i}, through the AP signal strength (RSSI), background noise (Noise), current AP associated STA number (Associated Stations), AP real-time traffic (NetworkTraffic) and AP usage priority ( Priority) and other factors are weighted. Then, according to the interference value of all AP{i} in channel N and APs on adjacent channels, the formula weight a*RSSI+weight b*floor noise+weight c*channel traffic+weight d*priority can be used, where, The weights a, b, c, and d all have specific value ranges.

S310: Comprehensive calculation and comparison, to obtain a channel with the smallest interference value, that is, a relatively "clean" channel;

S312: The AP to be accessed switches to this channel;

After the timer reaches the time, the next automatic channel selection judgment is performed.

Beacon is a management frame of IEEE802.11 wireless local area network. The Beacon is broadcast periodically by the AP, which contains a series of important information about the AP, and the relevant information in the Beacon can be updated regularly. STAs in the wireless local area network perform information exchange based on received Beacon beacons, while other APs can dynamically adjust some functions based on scanning and analyzing Beacon beacon information around them. The method used in the example of the present invention regularly scans and detects the Beacon frame information of the AP, uses these information to perform comprehensive calculations, and retreats channels that are currently occupied or are seriously occupied, so as to achieve the purpose of fully utilizing limited channel resources.

Through the above description of the implementation, those skilled in the art can clearly understand that the method according to the embodiment can be implemented by means of software plus a necessary general-purpose hardware platform, of course, it can also be implemented by hardware, but in many cases the former is more best implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to make a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) execute the method of each embodiment of the present invention.

Embodiments 3 and 4 also provide a channel access device, and the following devices are used to implement the above embodiments and preferred implementation modes, and those that have already been described will not be repeated. As used hereinafter, the term "module" may realize a combination of software or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

Embodiment three:

In this example, a channel access device is also provided. FIG. 4 is a structural block diagram of a channel access device according to an embodiment of the present invention. As shown in FIG. 4, the device is applied to a first access point AP, including:

A receiving module 42, configured to receive feature information of all second APs that have accessed available channels;

The selection module 44 is connected with the receiving module 42 and is used to select the channel with the lowest utilization rate for access according to the received feature information, wherein the first AP is an access point to be accessed to the available channel.

Preferably, FIG. 5 is a structural block diagram of a receiving module 42 of a channel access device according to an embodiment of the present invention. As shown in FIG. 5 , the receiving module 42 includes: a receiving unit 422 configured to receive all second The Beacon frame sent by the AP, wherein the feature information of the second AP has been encapsulated in the Beacon frame; the parsing unit 424 is connected to the receiving unit 422 for parsing the Beacon frame to obtain all the feature information of the second AP.

Preferably, FIG. 6 is a structural block diagram of a channel access device selection module 44 according to an embodiment of the present invention. As shown in FIG. 6, the selection module 44 includes: an acquisition unit 442, configured to acquire each The channel usage information of the above available channels; the selection unit 444 is connected to the acquisition unit 442, and is used to compare the channel usage information of all the above available channels, and select the channel with the lowest utilization rate for access.

Preferably, FIG. 7 is a structural block diagram of a channel access device acquisition unit 442 according to an embodiment of the present invention. As shown in FIG. 7, the acquisition unit 442 includes: a storage subunit 4422, which is used to access The feature information sent by all the above-mentioned second APs of the currently available channel type is stored in a linked list, wherein the above-mentioned linked list is constructed with the basic service set identity information BSSID obtained by parsing the above-mentioned Beacon frame as an index value; the calculation subunit 4424, connected to the storage subunit 4422, and configured to perform weighted calculation on the above feature information in the above linked list to obtain the channel usage information of the above currently available channels.

Preferably, this example also provides a channel access device, which is applied to the second access point AP, and includes: a sending module, configured to send its own characteristic information to the first AP, so that the first AP according to The above feature information selects the channel with the lowest utilization rate among the available channels for access; wherein, the above-mentioned first AP is an access point to be accessed to the above-mentioned available channel, and the above-mentioned second AP is an access point that has accessed the above-mentioned available channel .

Through this device, according to the mixed function of the receiving module 42 and the selection module 44, the Beacon frame information of the AP is scanned and detected at regular intervals, and the information is used for comprehensive calculation to back off the channels that are currently occupied or are seriously occupied, so as to achieve The purpose of making full use of limited channel resources.

Embodiment four:

In this example, a channel access device is also provided. FIG. 8 is a structural block diagram of a channel access device according to another embodiment of the present invention. As shown in FIG. 8, the device includes:

The STA association module 82 is used to process the STA association process, report STA online and offline information, and update the current STA association status and the number of AP associated STAs. Wireless message receiving module;

The message sending and receiving module 84 is used to receive and send all messages of the AP, including management, control and data messages, and process the interaction process with the STA. Analyze and obtain information such as the current AP's working channel (Channel), the number of current AP-associated STAs (Associated Stations), the real-time traffic of the AP for a period of time (Network Traffic), and the AP priority (Priority) in other AP Beacon frames, and obtain the current AP uplink traffic value; responsible for sending data packets to each STA to obtain the current AP downlink traffic value;

The timer module 86 is connected with the message sending and receiving module 84 and the STA association module 82, and is responsible for the timing function, and regularly detects whether the current timing time is reached;

The Beacon assembly sending module 88 is connected with the timer module 86, and is responsible for regularly assembling and updating the Beacon frame, regularly updating the working channel (Channel) of the current AP in the Beacon frame, the number of STAs associated with the current AP (Associated Stations), and AP's real-time traffic (Network Traffic) for a period of time, AP priority (Priority) and other information;

The automatic channel selection module 80 is connected with the timer module 86, and this module is responsible for implementing the automatic channel algorithm, completing the whole process of channel selection, and performing final channel switching.

The implementation of the above specific functions is not completely limited to the division of the above modules, and can be flexibly adjusted during implementation.

In the implementation of the present invention, all APs in the area are required to use the automatic channel method.

The current AP has no STA association. According to the relevant information of other surrounding APs obtained in the Beacon frame (including the current AP's working channel (Channel), the current AP's associated STA number (Associated Stations), and the AP's real-time traffic (Network Traffic) for a period of time , AP use Priority (Priority), etc.) for automatic channel selection.

Judging whether each channel is currently "idle" (according to whether the AP on the channel is associated with an STA), if there is currently a channel "idle", then select the idle channel; if all channels are not currently idle, then according to the original automatic channel algorithm A series of judging factors, adding the judging factor of the total real-time traffic on each channel, weighted calculations based on each judging factor, get a relatively "idle" channel, and then select the channel.

Through this device, according to the comprehensive functions of the STA association module 82, the message transceiver module 84, the timer module 86, the Beacon assembly sending module 88 and the automatic channel selection module 80, it is realized to realize the Beacon frame information of the timing scanning detection AP, and use these information Carry out comprehensive calculations, and back off channels that are currently occupied or are seriously occupied, so as to achieve the purpose of making full use of limited channel resources.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. a kind of channel access method, which is characterized in that including：

First access point AP has accessed the characteristic information of all 2nd AP of available channel；

According to the characteristic information Selection utilization rate received, minimum channel is accessed, wherein the first AP is to wait for Access the access point of the available channel.

2. according to the method described in claim 1, it is characterized in that, the first access point AP has accessed all of available channel The characteristic information of 2nd AP includes：

First access point AP has accessed the Beacon frames that all 2nd AP of available channel are sent, wherein the Beacon The characteristic information of the 2nd AP has been encapsulated into frame；

The Beacon frames are parsed, the characteristic information of all 2nd AP is obtained.

3. according to the method described in claim 2, it is characterized in that, most according to the characteristic information Selection utilization rate received Low channel carries out access：

The channel usage information of each available channel is obtained according to the characteristic information received；

Compare the channel usage information of all available channels, the minimum channel of Selection utilization rate is accessed.

4. according to the method described in claim 3, it is characterized in that, being obtained according to the characteristic information received each described The channel usage information of available channel includes：

The institute of the available channel of current type will be accessed according to the type of the available channel for each available channel There is the characteristic information that the 2nd AP is sent to store into chained list, wherein the chained list is obtains to parse the Beacon frames The basic service set identification information BSSID taken is built as index value；

The characteristic information in the chained list is weighted, the channel usage letter of the available channel is obtained Breath.

5. method according to any one of claims 1 to 4, which is characterized in that the characteristic information include it is following at least it One：The working channel information of 2nd AP, the association wireless terminal information of number of the 2nd AP, the 2nd AP it is real-time The use priority information of flow information, the 2nd AP.

6. a kind of channel access method, which is characterized in that including：

The characteristic information of itself is sent to the first AP by the second access point AP, so that the first AP exists according to the characteristic information The minimum channel of Selection utilization rate is accessed in available channel；Wherein, the first AP is the available channel to be accessed Access point, the 2nd AP are the access point for having accessed the available channel.

7. according to the method described in claim 6, it is characterized in that, the characteristic information of itself is sent to first by the 2nd AP AP includes：

2nd AP encapsulates the characteristic information of itself to being sent in the Beacon frames of the first AP；

Beacon frames after the encapsulation are sent to the first AP.

8. the method according to the description of claim 7 is characterized in that so that the first AP selects profit according to the characteristic information Carrying out access with the minimum channel of rate includes：

So that types of the first AP according to the available channel, will access all described the second of currently available channel type The characteristic information that AP is sent is stored into chained list, wherein the chained list is to parse the BSSID works that the Beacon frames obtain It is built for index value；

So that the characteristic information in the chained list is weighted the first AP, the currently available channel is obtained Channel usage information；

So that the channel usage information of more all available channels of the first AP, the minimum channel of Selection utilization rate It is accessed.

9. according to claim 6 to 8 any one of them method, which is characterized in that the characteristic information include it is following at least it One：The working channel information of 2nd AP, the association wireless terminal information of number of the 2nd AP, the 2nd AP it is real-time The use priority information of flow information, the 2nd AP.

10. a kind of channel access device is applied to the first access point AP, which is characterized in that including：

Receiving module, the characteristic information of all 2nd AP for having accessed available channel；

Selecting module, for being accessed according to the minimum channel of the characteristic information Selection utilization rate received, wherein institute State the access point that the first AP is the available channel to be accessed.

11. device according to claim 10, which is characterized in that the receiving module includes：

Receiving unit, the Beacon frames that all 2nd AP for having accessed available channel are sent, wherein the Beacon The characteristic information of the 2nd AP has been encapsulated into frame；

Resolution unit obtains the characteristic information of all 2nd AP for parsing the Beacon frames.

12. according to the devices described in claim 11, which is characterized in that the selecting module includes：

Acquiring unit, the channel usage letter for obtaining each available channel according to the characteristic information received Breath；

Selecting unit is used for the channel usage information of more all available channels, the minimum channel of Selection utilization rate It is accessed.

13. device according to claim 12, which is characterized in that the acquiring unit includes：

Storing sub-units will access all described the of currently available channel type for according to the type of the available channel Two AP send characteristic information store into chained list, wherein the chained list for parse the Beacon frames obtain it is basic Service set identity identification information BSSID is built as index value；

Computation subunit obtains the currently available letter for the characteristic information in the chained list to be weighted The channel usage information in road.

14. a kind of channel access device is applied to the second access point AP, which is characterized in that including：

Sending module, for the characteristic information of itself to be sent to the first AP, so that the first AP is according to the characteristic information The minimum channel of Selection utilization rate is accessed in available channel；Wherein, the first AP is the available channel to be accessed Access point, the 2nd AP is the access point for having accessed the available channel.