CN102378218A - Access point equipment of wireless local area network and channel selection method thereof - Google Patents

Abstract

The invention discloses a wireless local area network access point device and a channel selection method thereof. The access point device includes a first radio frequency unit and a communication module connected to the first radio frequency unit, which is used to scan channels in the area where the access point device is located The second radio frequency unit of the channel information, the channel detection module connected to the second radio frequency unit, and the wireless management module respectively connected to the communication module and the channel detection module; wherein the wireless management module is used for according to the detection information and Predetermined rules, select channels that meet the communication conditions for data transmission. The present invention scans and detects each channel in the area where the access point device is located, selects a channel that meets the communication conditions for data transmission according to predetermined rules, and effectively avoids two accesses working on the same or adjacent channels. When there is data transmission on all point devices, due to channel competition/conflict, the defect of transmission packet loss is caused, thereby improving the performance of the wireless network.

Description

A wireless local area network access point device and channel selection method thereof

technical field

The invention relates to wireless local area network technology, in particular to a wireless local area network access point device and a channel selection method thereof.

Background technique

At present, the terminal (mobile terminal or computer) in the wireless local area network accesses the network through the access point (AP) device, and the wireless local area network technology based on IEEE 802.11 series specifications is relatively important and widely used in the interconnection technology of hotspot areas. a technique.

Since IEEE 802.11 works in the unlicensed open network frequency band, there are various types of wireless LAN deployment users, and operators, enterprises, and individuals can all deploy, and multiple access points will not negotiate and jointly optimize each other when deploying Deployment, so there are multiple access points deployed in the same coverage area at the same time, subject to interference from other devices in this frequency band, mutual interference will have a great impact on network performance.

In order to reduce or avoid interference, usually when deploying a single LAN, try to use engineering optimization methods to use one channel in the same area as much as possible, and use orthogonal channels that do not interfere with each other between adjacent areas (such as 1, 6, 11 channels). The existing AP channel self-adjustment scheme mainly selects a clean channel by scanning to set the working channel of the AP to avoid interference between APs and ensure the capacity of the LAN. The precondition for implementing this method is that there cannot be AP coverage exceeding the number of orthogonal channels in the same area. For example, if working at 2.4GHz, if the number of APs at the current location is more than 3, no matter what the setting is, the AP cannot scan other clean channels.

With the deployment of a large number of hotspot areas by operators, the extensive use of wireless APs in personal home networks, and the wireless coverage of enterprises, there are often more than three APs covering the same area, and it is difficult to find a clean channel. In the absence of consultation between home deployment users, even if the deployment of the own network is optimized by engineering optimization methods, the interference problem among multiple LANs cannot be avoided. The impact of wireless interference on the network is mainly in data transmission. When two APs work on the same/adjacent channel and both APs have data transmission, due to channel competition/conflict, the two APs will An AP transmits packet loss, which affects wireless network performance.

Contents of the invention

In order to overcome the defects in the prior art, the present invention provides a wireless local area network access point device and a channel selection method thereof, so as to effectively enhance the security and reliability of data transmission and improve wireless network performance.

To achieve the above object, the present invention provides an access point device, including: a first radio frequency unit and a communication module connected to the first radio frequency unit, and also includes: a second radio frequency unit, used to scan the access point The channel information of each channel in the area where the point device is located; the channel detection module is connected to the second radio frequency unit, and is used to detect the channel information scanned by the second radio frequency unit to obtain detection information; the detection information includes Detect the channel number and the number of stations corresponding to the channel; the wireless management module is connected to the communication module and the channel detection module respectively, and is used to select a channel that meets the communication conditions for data transmission according to the detection information and predetermined rules.

To achieve the above object, the present invention also provides a channel selection method for an access point device, including: scanning channel information of each channel in the area where the access point device is located; detecting the scanned channel information, and obtaining Detection information; the detection information includes the channel number and the number of stations corresponding to the detected channel; according to the detection information and predetermined rules, select a channel that meets the communication conditions for data transmission.

It can be seen from the above technical solutions that the present invention adds a second radio frequency unit, a detection module and a wireless management module to the access point device to scan and detect the wireless transmission environment and channel selection judgment for the area where the access point device is located, which can effectively It can effectively avoid the defect of transmission packet loss caused by channel competition/conflict when two access point devices working on the same or adjacent channels have data transmission, and can enhance the security and reliability of data transmission , thereby improving the performance of the wireless network.

The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of an access point device according to an embodiment of the present invention;

Fig. 2 is a flowchart of a channel selection method for an access point device according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

FIG. 1 is a schematic structural diagram of an access point device according to an embodiment of the present invention. As shown in FIG. The working radio frequency used by the access point device for data transmission acts on the normal transceiver used for communication. The communication module 12 is connected with the first radio frequency unit 11 and used for completing data transmission based on the working radio frequency provided by the first radio frequency unit 11 . In the access point device provided by the embodiment of the present invention, in order to ensure that it works on a data transmission channel without interference or with relatively little interference, a function for scanning the area where the access point device is located is added to the access point device. The second radio frequency unit 13 for channel information of each channel, the channel detection module 14 connected to the second radio frequency unit 13 , and the wireless management module 15 connected to the communication module 12 and the channel detection module 14 respectively. Wherein, the second radio frequency unit 13 acts on the detection transceiver of scanning channel information; The channel information scanned by the radio frequency unit 13 detects and obtains the detection information of the detected channel, which at least includes information such as the channel number and the number of stations corresponding to the detected channel; For management, select a channel that meets the communication conditions for data transmission according to the above detection information and predetermined rules, wherein the wireless management module 15 sets the working channel of the first radio frequency unit 11 through the communication module 12 .

Specifically, when the access point device is deployed in a new area and needs to select a working channel or switch the working channel in the original working area, the access point device communicates with each other in the area where it is located through the second radio frequency unit 13 The channel is scanned for channel information, and the channel detection module 14 receives the scanning information of the second radio frequency unit 13 and performs information detection to obtain the information required for channel selection, for example including at least the channel number and the number of stations corresponding to the detected channels. The channel number may be channel identification information of the detected channel, and the number of stations indicates how many stations have used the detected channel as a working channel. After the channel detection module 14 obtains the detection information, the wireless management module 15 performs channel selection. Specifically, according to the monitoring information obtained by the channel detection module 14 and predetermined rules, the wireless management module 15 selects a channel that meets the communication conditions from a plurality of detected channels as the working channel of the access point device, and transmits data through this channel. transmission.

The predetermined rule described in this embodiment may be set in the device before deploying the access point device or during the working process, in order to select a channel that is free from external interference or least affected by external interference for data transmission The channel selection rules can be stored in the wireless management module by means of software programs or databases.

The access point device provided by the present invention obtains detection information by scanning the channel information of each channel in its area, and performs channel selection according to the detection information and predetermined rules, and selects a channel that meets the communication conditions for data transmission. It effectively avoids the defect of transmission packet loss caused by channel competition/conflict when two access point devices working on the same or adjacent channels have data transmission, and enhances the security and safety of data transmission. Reliability, thereby improving the performance of the wireless network.

In the embodiment of the present invention, taking the working condition of 2.4GHz as an example, the predetermined rules and how the access point device completes the channel selection are described in detail.

Under the condition of 2.4GHz frequency, the channels whose channel isolation degree is greater than or equal to the predetermined threshold 5 are orthogonal channels to each other, and will not cause interference to each other. For example, the channels with channel numbers 1, 6, and 11 are orthogonal channels to each other. , where the channel isolation is the absolute value of the difference between the channel numbers of the two channels, otherwise the channels whose channel isolation is less than the predetermined threshold 5 are adjacent channels. If the number of access point devices deployed in the same area is less than the number of orthogonal channels, there is an undisturbed channel for the newly added access point device to choose; if the number of access point devices deployed in the same area is greater than or equal to When the number of orthogonal channels exists, there is no uninterferenced channel, and the newly added access point device can only select one channel from the remaining channels to access the network. In this case, the corresponding information in the detection information can be used. Information is used as a judgment condition, and the channel with less interference is selected from adjacent channels for data transmission.

Wherein, the detection information may also include: the number of data packets transmitted by the detected channel in the latest transmission period, the size of the data packets, the data transmission rate corresponding to the detected channel, and the received signal strength corresponding to the detected channel RSS (Received Signal Strength) and/or SINR (Signal to Interference plus Noise Ratio). Wherein, the number of data packets transmitted by the detected channel in the latest transmission cycle indicates the number of data packets transmitted by the detected channel in the previous cycle of the current scanning cycle, and is used to judge the detected channel Whether there is data transmission; the size of the data packet transmitted by the detected channel in the latest transmission period indicates the size of the actual transmission data volume of the detected channel in the previous week of the current scanning transmission period, which is different from the detected channel The corresponding transmission rate is commonly used to judge whether the detected channel is busy or idle; the received signal strength RSS and/or signal-to-interference-noise ratio SINR corresponding to the detected channel is the signal strength and A measure of the intensity of interference noise, used to quantitatively evaluate the degree of interference between adjacent channels.

Further, the predetermined rule includes preferentially selecting a detected channel whose number of corresponding stations is zero and the number of stations corresponding to its adjacent channel is also zero, that is, a clean channel. Wherein the adjacent channel is the detected channel whose absolute value of the difference between the channel number and the channel number of the detected channel is less than a predetermined threshold, the absolute value of the difference is the degree of isolation, and the predetermined threshold is the preset The isolation value placed in the system to ensure that two channels do not cause interference with each other. For example, under the condition of 2.4GHz, channels with channel isolation less than 5 are adjacent channels, that is, channel 1 and channel 4 are adjacent channels, and their isolation is 3; channel 1 and channel 6 are non-adjacent channels, That is, the orthogonal channel has an isolation degree of 5. The clean channel itself is not occupied by other working stations, and it is not adjacent to the channels occupied by other working stations currently scanned. The clean channel is free from external interference and serves as the access point device For optimal channel selection, if there is a clean channel in the area where the access point device is located, the wireless management module 15 will switch the working channel to the clean channel.

Specifically, for example, when the access point device is deployed in a new area and needs to select a working channel, according to the predetermined rules of the access point device, first determine whether there is a clean channel that is not occupied by other stations and is not interfered with in the area , if it exists, the clean channel is preferred.

The access point device provided by the present invention judges the scanning results of the channel information of each channel in its area, and switches the working channel to the clean channel first when there is a clean channel, effectively avoiding unnecessary Interference, to ensure the quality of data transmission of the wireless network.

Further, the predetermined rule also includes that when a clean channel cannot be detected, preferentially select a detected channel whose number of corresponding stations is not zero but has no data transmission, and its adjacent channels have no data transmission, that is, idle channel. Wherein, according to the number of data packets transmitted by the detected channel included in the detection information in the latest transmission period, it is judged whether there is data transmission in the detected channel and its adjacent channels. The idle channel itself has been occupied by other working stations, but no data transmission is performed; its adjacent channel may be occupied or unoccupied by other working stations, but no data transmission is performed. The idle channel is a better channel selection when there is no clean channel in the area where the access point device is located. If there is an idle channel in the area where the access point device is located, the wireless management module 15 will switch the working channel to the idle channel.

Specifically, when the access point device is deployed in a new area and needs to select a working channel or switch the working channel in the original working area, according to the predetermined rules of the access point device, if it is judged that there is no clean channel in the area, It is then judged whether there is an idle channel in the area that has no data transmission for itself and adjacent channels, and if there is, the idle channel is preferentially selected.

The access point device provided by the present invention judges the scanning results of the channel information of each channel in its area, and switches the working channel to an idle channel first when there is no clean channel, and switches the working channel to an idle channel in priority, and in wireless transmission that may have interference In the environment, by selecting the channel with the least interference for transmission, the data transmission quality should be kept as good as possible.

Further, the predetermined rule also includes preferentially selecting a non-idle channel when an idle channel cannot be detected, and the non-idle channel described in this embodiment may include its own non-idle channel, a neighbor non-idle channel, and a non-idle channel. All non-idle channels. The self-non-idle channel is a detected channel whose number of corresponding stations is not zero and has data transmission, but its adjacent channel has no data transmission, that is, the detected channel has been occupied by other working stations and there is data transmission , its adjacent channel may be occupied or unoccupied by other working stations, but no data transmission is performed; the adjacent non-idle channel has no data transmission, but the number of stations corresponding to its adjacent channel is not zero and The detected channel with data transmission, that is, the detected channel itself may be occupied or unoccupied by other working stations, but no data transmission is performed, and its adjacent channel has been occupied by other working stations and there is data Transmission; the all non-idle channel is a detected channel with data transmission and its adjacent channels also have data transmission, that is, the detected channel itself and its adjacent channels have been occupied by other working stations and there is data transmission . The non-idle channel is the channel selection type when there is no idle channel in the area where the access point device is located. If there is no idle channel in the area where the access point device is located, the wireless management module 15 will switch the working channel to a non-idle channel. channel.

Specifically, when the access point device is deployed in a new area and needs to select a working channel or switch the working channel in the original working area, according to the predetermined rules of the access point device, if it is judged that there is no idle channel in the area, Then select a non-idle channel for data transmission.

The access point device provided by the present invention judges the scanning results of the channel information of each channel in its area, and switches the working channel to a non-idle channel when there is no idle channel. In , by selecting a channel with less interference for transmission, a better data transmission quality can be maintained as much as possible.

所述检测信息中还包括所述被检测信道在最近的传输周期内所传输的数据包大小和传输速率，用于计算当前信道所对应的数据传输时间占空比T_i以及所述当前信道的各相邻信道所对应的数据传输时间占空比T_j，T_i和T_j的计算方法均为最近的传输周期内所传输的数据包大小/(传输速率*传输周期)。其中，所述当前信道及其各相邻信道的数据传输时间占空比，为该当前信道及其各相邻信道分别在传输周期内数据发送时间对该传输周期的占用比例。例如以占用信道号为6的信道进行传输且传输周期为20秒为例进行说明，若该信道处于邻居非空闲状态，即该信道的相邻信道上存在数据传输，如果该相邻信道的传输速率为1Mbps，则其与20秒的传输周期内最多能够传送20Mb的数据量，如果在一个传输周期内，该信道实际发送的数据量为10Mb，则该相邻信道的数据传输时间占空比为1/2。m_ij为所述当前信道的各相邻信道对所述当前信道的干扰权重，是数据传输时间占空比T的重要计算依据，m_ij＝信道隔离度影响因子A_ij*信道干扰强度影响因子B_ij，其中，0＜B_ij≤1。所述检测信息还包括被检测信道对应的接收信号强度RSS和/或信号与干扰噪声比SINR，用于计算得到所述信道干扰强度影响因子B_ij。所述数据传输时间占空比T即为当前信道及其相邻信道数据传输时间占空比的加权和。若接入点设备所在区域内存在数据传输时间占空比符合条件的非空闲信道，则由无线管理模块15将工作信道切换至该非空闲信道。Further, when there are only non-idle channels in the area where the access point device is located, in order to preferentially select a non-idle channel for data transmission, the embodiment of the present invention provides a method for reasonably selecting a non-idle channel from the detected non-idle channels. According to the rules of the optimal channel, it is not necessary to judge the type of the non-idle channel during the process of selecting the non-idle channel. The selection rule for non-idle channels in the predetermined rule also includes selecting a non-idle channel with the smallest data transmission time duty cycle T for data transmission, wherein

The detection information also includes the data packet size and transmission rate transmitted by the detected channel in the latest transmission period, which are used to calculate the data transmission time duty cycle T _i corresponding to the current channel and the current channel's The data transmission time duty cycle T _j corresponding to each adjacent channel, the calculation method of T _i and T _j is the size of the data packet transmitted in the latest transmission cycle/(transmission rate*transmission cycle). Wherein, the data transmission time duty cycle of the current channel and its adjacent channels is the proportion of data transmission time occupied by the current channel and its adjacent channels in the transmission period to the transmission period. For example, take the channel with channel number 6 as an example for transmission and the transmission period is 20 seconds. If the channel is in the neighbor non-idle state, that is, there is data transmission on the adjacent channel of the channel, if the transmission of the adjacent channel If the rate is 1Mbps, it can transmit up to 20Mb of data in a transmission period of 20 seconds. If the actual data volume sent by this channel is 10Mb in one transmission period, the data transmission time duty cycle of the adjacent channel for 1/2. m _ij is the interference weight of each adjacent channel of the current channel to the current channel, which is an important calculation basis for the data transmission time duty ratio T, m _ij = channel isolation factor A _ij * channel interference intensity factor B _ij , where, 0<B _ij ≤1. The detection information also includes a received signal strength RSS and/or a signal-to-interference-noise ratio SINR corresponding to the detected channel, which is used to calculate the channel interference strength influencing factor B _ij . The data transmission time duty ratio T is the weighted sum of the data transmission time duty ratios of the current channel and its adjacent channels. If there is a non-idle channel in the area where the access point device is located and the duty ratio of the data transmission time meets the conditions, the wireless management module 15 switches the working channel to the non-idle channel.

Specifically, when the access point device is deployed in a new area and needs to select a working channel or switch the working channel in the original working area, according to the predetermined rules of the access point device, if there are only non-idle channels in the area, It is necessary to select a non-idle channel for transmission according to the data transmission time duty cycle of the current channel and its adjacent channels, combined with the channel isolation factor A _ij and the channel interference intensity factor B _ij .

The access point device provided by the present invention judges the scanning results of the channel information of each channel in its area, and switches the working channel to a non-idle channel with the least interference when there are only non-idle channels, so that In the case of unavoidable interference, try to ensure better data transmission quality.

Further, since channel switching will inevitably bring certain overhead, after the access point device detects the detected channel conforming to the predetermined rule according to the methods provided by the above-mentioned embodiments, it also needs to perform channel switching before performing channel switching. Carry out switching threshold judgment. The predetermined rule also includes obtaining the transmission delay after channel switching and the transmission delay of the current channel according to the detection information, and if it is determined that the difference between the transmission delay after channel switching and the transmission delay of the current channel If the sum of the delays is less than a predetermined switching threshold, channel switching is performed; if not, channel switching is not performed. The switching threshold is the maximum value of the fixed switching time delay preset in the access point device according to the system requirements, and only when the time delay used for channel switching is less than the switching threshold, it means that the channel switching can bring certain benefits. Gain, the wireless transmission network can be guided to a better channel through channel switching.

Specifically, for example, when the access point device switches the working channel in the original working area, after the access point device retrieves the detected channel that meets the conditions, it needs to judge the switching threshold before switching the channel , when the time delay used for channel switching is less than the switching threshold, channel switching can be performed; otherwise, the current working channel can continue to be occupied without switching.

The access point device provided by the present invention first judges the channel switching threshold before the channel switching, which ensures that the channel switching can direct data transmission to a better channel, avoids unnecessary switching, saves system resources, and maximizes A better data transmission quality is guaranteed.

In the above technical solution, when more than one clean channel or idle channel is detected, the predetermined rule further includes, if there are multiple clean channels, randomly selecting one of them; if there are multiple idle channels , choose one of them at random.

Specifically, when the access point device is deployed in a new area and needs to select a working channel or switch the working channel in the original working area, according to the predetermined rules of the access point device, if there is more than one clean When there is no channel or an idle channel, the access point device can randomly select a channel that meets the conditions for access.

The access point device provided by the present invention judges the channel information scanning results of each channel in its area, and when more than one channel belongs to a clean channel or an idle channel, randomly selects one of the channels to ensure the quality of the data transmission channel and channel selection efficiency.

FIG. 2 is a flow chart of a channel selection method for an access point device in an embodiment of the present invention. As shown in FIG. 2 , the channel selection method for an access point device provided in an embodiment of the present invention includes:

Step 101, scan the channel information of each channel in the area where the access point device is located;

Step 102, detecting the scanned channel information to obtain detection information;

Step 103, according to the detection information and predetermined rules, select a channel meeting the communication conditions for data transmission.

Specifically, for the channel selection method of the access point device provided in the embodiment of the present invention, reference may be made to the processing steps described in the foregoing apparatus embodiments, which will not be repeated here.

The access point device channel selection method provided by the present invention scans and detects the wireless transmission environment in the area where the access point device is located and judges the conditions, and selects a better channel for data transmission, which can ensure the security and safety of data transmission. Reliability, thereby effectively improving the performance of the wireless network.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (16)

1. An access point device, comprising a first radio frequency unit and a communication module connected to the first radio frequency unit, characterized in that it also includes: The second radio frequency unit is used to scan the channel information of each channel in the area where the access point device is located; A channel detection module, connected to the second radio frequency unit, for detecting the channel information scanned by the second radio frequency unit to obtain detection information; the detection information includes the channel number and the number of stations corresponding to the detected channel; The wireless management module is respectively connected with the communication module and the channel detection module, and is used to select a channel meeting the communication conditions for data transmission according to the detection information and predetermined rules. 2. The access point device according to claim 1, wherein the predetermined rule comprises: preferentially selecting a clean channel among the detected channels for data transmission; the clean channel means that the number of corresponding stations is The detected channel is zero and the number of stations corresponding to its adjacent channel is also zero; wherein, the isolation between the adjacent channel and the detected channel is less than a predetermined threshold, and the isolation is the adjacent channel The absolute value of the difference between the corresponding channel number and the channel number corresponding to the detected channel. 3. The access point device according to claim 2, wherein the detection information further includes the number of data packets transmitted by the detected channel in the latest transmission period; Correspondingly, the predetermined rule also includes: if the clean channel does not exist, select an idle channel for data transmission; the idle channel refers to the corresponding station number is not zero but no data transmission, and its adjacent channel There is no detected channel for data transmission; wherein, whether there is data transmission is judged according to the number of data packets transmitted by the detected channel in the latest transmission cycle. 4. The access point device according to claim 3, wherein the predetermined rule further comprises: if the idle channel does not exist, then selecting a non-idle channel for data transmission; the non-idle channel includes: Own non-idle channel, neighbor non-idle channel and all non-idle channels, where: The self-non-idle channel refers to a detected channel whose corresponding station number is not zero and has data transmission, but its adjacent channel has no data transmission; The neighbor non-idle channel refers to a detected channel that has no data transmission, but the number of stations corresponding to its adjacent channel is not zero and there is data transmission; All non-idle channels refer to detected channels that have data transmission and its adjacent channels also have data transmission. 5. The access point device according to claim 4, wherein the detection information further includes the size and transmission rate of the data packet transmitted by the detected channel in the latest transmission period; Correspondingly, selecting a non-idle channel for data transmission includes: selecting a non-idle channel with the smallest data transmission time duty ratio T for data transmission; wherein,

T _i is the data transmission time duty cycle corresponding to the current channel, T _j is the data transmission time duty cycle corresponding to each adjacent channel of the current channel, m _ij is each adjacent channel pair of the current channel The interference weight of described current channel; The calculation method of T _i and T _j all is the transmitted data packet size/(transmission rate*transmission cycle) in the latest transmission cycle; m _ij =channel isolation factor A _ij *channel Interference intensity influencing factor B _ij , where,

6. The access point device according to claim 5, wherein the detection information further includes a received signal strength (RSS) and/or a signal to interference and noise ratio (SINR) corresponding to the detected channel, for use according to the The corresponding B _ij is acquired by RSS and/or SINR. 7. The access point device according to claim 5 or 6, wherein the predetermined rule further comprises: obtaining the transmission delay after channel switching and the transmission delay of the current channel according to the detection information, and if it is determined that the channel If the sum of the difference between the transmission delay after switching and the transmission delay of the current channel and the channel switching delay is less than a predetermined switching threshold, channel switching is performed; if not less than, channel switching is not performed. 8. The access point device according to claim 3, wherein the predetermined rule further comprises: if there are multiple clean channels, randomly select one of them; if there are multiple idle channels, then Choose one of them at random. 9. A channel selection method for an access point device, characterized in that, comprising: Scanning the channel information of each channel in the area where the access point device is located; Detecting the scanned channel information to obtain detection information; the detection information includes the channel number and the number of stations corresponding to the detected channel; According to the detection information and predetermined rules, a channel meeting the communication conditions is selected for data transmission. 10. The channel selection method of the access point device according to claim 9, wherein the predetermined rule comprises: preferentially selecting a clean channel among the detected channels for data transmission; the clean channel refers to the corresponding A detected channel whose number of stations is zero and the number of stations corresponding to its adjacent channel is also zero; wherein, the isolation between the adjacent channel and the detected channel is less than a predetermined threshold, and the isolation is the The absolute value of the difference between the channel number corresponding to the adjacent channel and the channel number corresponding to the detected channel. 11. The channel selection method of the access point device according to claim 10, wherein the detection information further includes the number of data packets transmitted by the detected channel in the latest transmission cycle; Correspondingly, the predetermined rule also includes: if the clean channel does not exist, select an idle channel for data transmission; the idle channel refers to the corresponding station number is not zero but no data transmission, and its adjacent channel There is no detected channel for data transmission; wherein, whether there is data transmission is judged according to the number of data packets transmitted by the detected channel in the latest transmission cycle. 12. The channel selection method of the access point device according to claim 11, wherein the predetermined rule further comprises: if the idle channel does not exist, selecting a non-idle channel for data transmission; Idle channels include: own non-idle channels, neighbor non-idle channels and all non-idle channels, where: The self-non-idle channel refers to a detected channel whose corresponding station number is not zero and has data transmission, but its adjacent channel has no data transmission; The neighbor non-idle channel refers to a detected channel that has no data transmission, but the number of stations corresponding to its adjacent channel is not zero and there is data transmission; All non-idle channels refer to detected channels that have data transmission and its adjacent channels also have data transmission. 13. The channel selection method of the access point device according to claim 12, wherein the detection information further includes the size and transmission rate of the data packet transmitted by the detected channel in the latest transmission period; Correspondingly, selecting a non-idle channel for data transmission includes: selecting a non-idle channel with the smallest data transmission time duty ratio T for data transmission; wherein,

T _i is the data transmission time duty cycle corresponding to the current channel, T _j is the data transmission time duty cycle corresponding to each adjacent channel of the current channel, m _ij is each adjacent channel pair of the current channel The interference weight of described current channel; The calculation method of T _i and T _j all is the transmitted data packet size/(transmission rate*transmission cycle) in the latest transmission cycle; m _ij =channel isolation factor A _ij *channel Interference intensity influencing factor B _ij , where,

14. The channel selection method of the access point device according to claim 13, wherein the detection information further includes RSS and/or SINR corresponding to the detected channel, for use according to the RSS and/or The SINR obtains the corresponding B _ij . 15. The channel selection method of the access point device according to claim 13 or 14, wherein the predetermined rule further comprises: obtaining the transmission delay after channel switching and the transmission delay of the current channel according to the detection information, and if it is judged that If the sum of the difference between the transmission delay after the channel switching and the transmission delay of the current channel and the channel switching delay is less than a predetermined switching threshold, channel switching is performed; if not less than, channel switching is not performed. 16. The channel selection method of an access point device according to claim 11, wherein the predetermined rule further comprises: if there are multiple clean channels, randomly selecting one of them; if there are multiple clean channels, If there are idle channels, one of them is randomly selected.

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