CN109347582B - A WLAN system dynamic channel allocation method and system - Google Patents

Abstract

The invention discloses a dynamic channel allocation method for a WLAN system, comprising the following steps: selecting a frequency point value to be detected in a frequency point range in a target area; performing channel interference measurement on the frequency point value to be detected, and calculating the frequency point value to be detected. The average level measurement value of the frequency point value to be detected; by comparing the frequency point value to be detected and the end point value of the frequency point in the target area, it is judged whether the measurement is completed; Select the optimal frequency point according to a plurality of average level measurement values corresponding to the frequency point value of the WLAN; perform dynamic channel allocation of the WLAN system according to the optimal frequency point. The embodiments of the present invention provide a method and system for dynamic channel allocation in a WLAN system, which can perform measurement without using any parameters related to the WLAN access point signal, thereby effectively improving the measurement efficiency, and further helping to accurately select the most Optimal frequency point for dynamic channel allocation.

Description

A WLAN system dynamic channel allocation method and system

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a method and system for dynamic channel allocation in a WLAN system.

Background technique

WLAN is the abbreviation of wireless local area network, the full name is Wireless Local Area Networks, which is a system that uses wireless technology for data transmission. It uses radio waves as the transmission medium, which reduces the deployment and construction costs of local area networks, and has been widely used in various industries.

The existing WLAN channel interference measurement method generally uses an AP or a monitoring module to measure the existing wireless environment, and the measurement result includes the adjacent cell SSID and related wireless signal parameters. Then, the frequency with the least interference is selected by the correlation algorithm as the candidate frequency.

Disadvantages of the prior art: when the relevant APs in the area turn off the SSID broadcast function, the above algorithms cannot measure the signal level normally, thus making the interference measurement invalid, the channel selection algorithm cannot work normally, and thus cannot effectively perform dynamic channel allocation.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method and system for dynamic channel allocation in a WLAN system, which can perform measurement without using any parameters related to the WLAN access point signal, thereby effectively improving the measurement efficiency, and further helping to accurately select the most Optimal frequency point for dynamic channel allocation.

To solve the above problem, on the one hand, an embodiment of the present invention provides a method for dynamic channel allocation in a WLAN system, including the following steps:

Select the frequency point value to be detected in the frequency point range in the target area; wherein, the frequency point value to be detected is the starting point value of the frequency point in the target area;

Perform channel interference measurement on the frequency value to be detected, and calculate the average level measurement value of the frequency value to be detected;

By comparing the frequency point value to be detected and the end point value of the frequency point in the target area, it is judged whether the measurement is completed;

If the measurement is not completed, shift the frequency point value to be detected forward by a preset frequency point interval of 1 unit, take the shifted frequency point value as the frequency point value to be detected, and return to the step "for The frequency point value to be detected is subjected to channel interference measurement"; if the measurement is completed, the optimal frequency point is selected according to a plurality of average level measurement values corresponding to all the frequency point values to be detected;

Perform dynamic channel allocation in the WLAN system according to the optimal frequency point;

Wherein, the channel interference measurement is performed on the frequency value to be detected, and the average level measurement value of the frequency value to be detected is calculated, specifically:

Calculate the average power value of all signals under the frequency value to be detected according to the sampling value within the preset time and the frequency value to be detected;

According to the smoothing length and the average power value, an average level measurement value is obtained by using an averaging algorithm; or according to the forgetting factor and the average power value, the average level measurement value is obtained by using a forgetting factor algorithm.

Further, by comparing the frequency point value to be measured and the end point value of the frequency point in the target area, judging whether the measurement is completed, specifically:

Compare the frequency point value to be measured and the end point value of the frequency point in the target area, if the frequency point value to be measured is less than the end point value of the frequency point in the target area, it is judged that the measurement has not been completed;

If the value of the frequency point to be measured is greater than or equal to the end point value of the frequency point in the target area, it is determined that the measurement has been completed.

Further, selecting the optimal frequency point according to the average level measurement value of all the frequency point values to be detected is specifically:

Calculate the number of frequency points required by the access point according to the round-up operator and the actual signal bandwidth of all access points; calculate the number of frequency points within the number of adjacent frequency points according to the average level measurement value A minimum interference power sum is obtained by comparing the multiple interference power sums one-to-one, and a frequency point corresponding to the minimum interference power sum is an optimal frequency point.

On the other hand, an embodiment of the present invention also provides a dynamic channel allocation system for a WLAN system, the system includes a frequency point selection module, a level measurement module, a time cumulative average module, a measurement judgment module, an optimal frequency point selection module and Dynamic channel allocation module;

The frequency point selection module is used to select the frequency point value to be detected in the frequency point range in the target area; wherein, the frequency point value to be detected is the starting point value of the frequency point in the target area;

The level measurement module is configured to calculate the average power value of all signals under the frequency value to be detected according to the sampling value within a preset time and the frequency value to be detected;

The time-cumulative averaging module is configured to obtain an average level measurement value by using an averaging algorithm according to the smoothing length and the average power value; or obtain an average level measurement value by using a forgetting factor algorithm according to the forgetting factor and the average power value.

The measurement and judgment module is used to judge whether the measurement is completed by comparing the frequency point value to be detected and the end point value of the frequency point in the target area;

The optimal frequency point selection module is used to select the optimal frequency point according to a plurality of average level measurement values corresponding to all the frequency point values to be detected;

The dynamic channel allocation module is configured to perform dynamic channel allocation of the WLAN system according to the optimal frequency point.

Further, the measurement and judgment module is specifically used for: comparing the frequency point value to be measured and the end point value of the frequency point in the target area, if the frequency point value to be measured is less than the end point value of the frequency point in the target area, Then it is judged that the measurement has not been completed;

If the value of the frequency point to be measured is greater than or equal to the end point value of the frequency point in the target area, it is determined that the measurement has been completed.

Further, the optimal frequency point selection module is specifically used to calculate the number of frequency points required by the access point according to the round-up operator and the actual signal bandwidth of all access points; calculate all the frequency points according to the average level measurement value. The multiple interference power sums in the frequency points of the number of adjacent frequency points, and the minimum interference power sums are obtained by comparing the multiple interference power sums one-to-one, and the minimum interference power and the corresponding frequency points are optimal frequency.

Embodiments of the present invention provide a method and system for dynamic channel allocation in a WLAN system, which can perform measurement without using any parameters related to the WLAN access point signal, thereby effectively improving the measurement efficiency, and further helping to accurately select the most Optimal frequency point for dynamic channel allocation.

Description of drawings

1 is a schematic flowchart of a method for dynamic channel allocation in a WLAN system provided by the present invention;

FIG. 2 is a schematic structural diagram of a dynamic channel allocation system of a WLAN system provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, an embodiment of the present invention provides a method for dynamic channel allocation in a WLAN system, including the following steps:

S101, selecting the frequency point value to be detected in the frequency point range in the target area; wherein, the frequency point value to be detected is the starting point value of the frequency point in the target area;

S102. Perform channel interference measurement on the frequency value to be detected, and calculate the average level measurement value of the frequency value to be detected;

S103, by comparing the frequency point value to be detected and the end point value of the frequency point in the target area, determine whether the measurement is completed;

S104. If the measurement has not been completed, shift the frequency point value to be detected forward by a preset frequency point interval of 1 unit, use the shifted frequency point value as the frequency point value to be detected, and return to step "to treat The detected frequency point value is used for channel interference measurement"; if the measurement is completed, the optimal frequency point is selected according to the multiple average level measurement values corresponding to all the frequency point values to be detected;

S105. Perform dynamic channel allocation of the WLAN system according to the optimal frequency point;

Among them, the channel interference measurement is performed on the frequency value to be detected, and the average level measurement value of the frequency value to be detected is calculated, specifically:

According to the sampling value within the preset time and the frequency value to be detected, calculate the average power value of all signals under the frequency value to be detected;

According to the smoothing length and the average power value, the average level measurement value is obtained by the averaging algorithm; or the forgetting factor algorithm is used to obtain the average level measurement value according to the forgetting factor and the average power value.

In the embodiment of the present invention, the expression of the average power value is:

Among them, d(k) represents the kth sampling value within the preset time, and K represents the total number of samples. Generally, the preset time can be selected as 5ms, 10ms or other suitable values. When the arithmetic mean is used, its formula is:

Among them, N is the smoothing length, the optional value of N is 8, 16, 32, etc., and P is the output of the average level measurement value; when the forgetting factor algorithm is used, the calculation formula is:

为平均电平测量值输出。where α is the forgetting factor,

Output for average level measurement.

As a specific implementation of this embodiment, by comparing the frequency point value to be measured and the end point value of the frequency point in the target area, it is determined whether the measurement is completed, specifically:

Compare the frequency point value to be measured and the end point value of the frequency point in the target area, if the frequency point value to be measured is less than the end point value of the frequency point in the target area, it is judged that the measurement is not completed;

If the value of the frequency point to be measured is greater than or equal to the end point value of the frequency point in the target area, it is determined that the measurement has been completed.

In the embodiment of the present invention, by comparing the value of the frequency point to be detected and the end point value of the frequency point in the target area, it is judged whether the measurement is completed. The method performs effective measurement at the frequency points in the area, avoids the measurement efficiency at the frequency points in the non-target area and reduces the measurement efficiency, so that the measurement efficiency can be effectively improved.

As a specific implementation of this embodiment, the optimal frequency point is selected according to the average level measurement value of all frequency point values to be detected, specifically:

Calculate the number of frequency points required by the access point according to the round-up operator and the actual signal bandwidth of all access points; , and compare multiple interference power sums one-to-one to obtain the minimum interference power sum, and the minimum interference power and the corresponding frequency point are the optimal frequency points.

In this embodiment of the present invention, the number of frequency points required to calculate the access point is:

为向上取整算子；再计算所有相邻N_F数量的频点内干扰功率和，表达式为：where F is the actual signal bandwidth of all access points,

is an upward rounding operator; then calculate the sum of the interference power in the frequency points of all adjacent _NF numbers, and the expression is:

Then, the frequency corresponding to the minimum value among the above interference power sums is selected as the optimal frequency, and the dynamic channel allocation of the WLAN system is performed according to the optimal frequency and is used by the newly deployed access point.

Second embodiment of the present invention:

Referring to FIG. 2, an embodiment of the present invention provides a dynamic channel allocation system for a WLAN system. The system includes a frequency point selection module 201, a level measurement module 202, a time cumulative average module 203, a measurement judgment module 204, and an optimal frequency point selection module. module 205 and dynamic channel allocation module 206;

The frequency point selection module 201 is used to select the frequency point value to be detected in the frequency point range in the target area; wherein, the frequency point value to be detected is the starting point value of the frequency point in the target area;

The level measurement module 202 is configured to calculate the average power value of all signals under the frequency value to be detected according to the sampling value within the preset time and the frequency value to be detected;

The time-cumulative averaging module 203 is configured to obtain the average level measurement value by using the averaging algorithm according to the smoothing length and the average power value; or obtain the average level measurement value by using the forgetting factor algorithm according to the forgetting factor and the average power value.

The measurement and judgment module 204 is used to judge whether the measurement is completed by comparing the frequency point value to be detected and the end point value of the frequency point in the target area;

The optimal frequency point selection module 205 is configured to select the optimal frequency point according to a plurality of average level measurement values corresponding to all the frequency point values to be detected;

The dynamic channel allocation module 206 is configured to perform dynamic channel allocation of the WLAN system according to the optimal frequency point.

As a specific implementation of the embodiment of the present invention, the measurement and determination module 204 is specifically configured to: compare the frequency point value to be measured and the end point value of the frequency point in the target area, if the frequency point value to be measured is smaller than the frequency point value in the target area the end point value, it is judged that the measurement has not been completed;

If the value of the frequency point to be measured is greater than or equal to the end point value of the frequency point in the target area, it is determined that the measurement has been completed.

As a specific implementation of the embodiment of the present invention, the optimal frequency point selection module 205 is specifically configured to calculate the number of frequency points required by the access point according to the round-up operator and the actual signal bandwidth of all access points; The level measurement value calculates the multiple interference power sums in the frequency points of all adjacent frequency points, and compares the multiple interference power sums one-to-one to obtain the minimum interference power sum. The minimum interference power and the corresponding frequency points are optimal frequency.

In the embodiment of the present invention, in the embodiment of the present invention, the number of frequency points required to calculate the access point is:

为向上取整算子；再计算所有相邻N_F数量的频点内干扰功率和，表达式为：where F is the actual signal bandwidth of all access points,

is an upward rounding operator; then calculate the sum of the interference power in the frequency points of all adjacent _NF numbers, and the expression is:

Then, the frequency corresponding to the minimum value among the above interference power sums is selected as the optimal frequency, and the dynamic channel allocation of the WLAN system is performed according to the optimal frequency and is used by the newly deployed access point.

Implementing the embodiment of the present invention has the following beneficial effects:

The embodiments of the present invention provide a method and system for dynamic channel allocation in a WLAN system. By measuring the level of continuous signals in a fixed frequency band for a certain period of time, the WLAN channel interference level in a target area can be accurately measured; The channel interference level is accumulated to calculate the interference power sum under the total bandwidth, and based on the above interference power sum, the optimal candidate frequency point with the smallest interference power is selected for dynamic channel allocation and use by the newly deployed access point, which can be used without connecting to the WLAN. Any parameter related to the incoming point signal is measured, thereby effectively improving the efficiency and accuracy of the measurement, and further helping to accurately select the optimal frequency point for dynamic channel allocation.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications are also regarded as the present invention. the scope of protection of the invention.

Claims (4)

1. A WLAN system dynamic channel allocation method is characterized by comprising the following steps:

selecting a frequency point value to be detected in a frequency point range in a target area; the frequency point value to be detected is the starting point value of the frequency point in the target area;

carrying out channel interference measurement on the frequency point value to be detected, and calculating an average level measurement value of the frequency point value to be detected;

judging whether the measurement is finished or not by comparing the frequency point value to be detected with the final point value of the frequency point in the target area;

if the measurement is not finished, shifting the frequency point value to be detected forward by a preset frequency point interval of 1 unit, taking the shifted frequency point value as the frequency point value to be detected, and returning to the step of performing channel interference measurement on the frequency point value to be detected; if the measurement is finished, selecting an optimal frequency point according to a plurality of average level measurement values corresponding to all frequency point values to be detected, specifically: calculating the number of frequency points required by the access point according to the upward rounding operator and the actual signal bandwidth of all the access points; calculating a plurality of interference power sums in all adjacent frequency points according to the average level measured value, and comparing the interference power sums one by one to obtain a minimum interference power sum, wherein the minimum interference power sum and the corresponding frequency point are optimal frequency points; the adjacent frequency points are the frequency points with the adjacent quantity being the number of the frequency points;

performing WLAN system dynamic channel allocation according to the optimal frequency point;

the method comprises the following steps of measuring channel interference on the frequency point value to be detected, and calculating an average level measurement value of the frequency point value to be detected, wherein the average level measurement value specifically comprises the following steps:

calculating the average power value of all signals under the frequency point value to be detected according to the sampling value in the preset time and the frequency point value to be detected;

obtaining an average level measurement value by adopting an average algorithm according to the smoothing length and the average power value; or obtaining the average level measurement value by adopting a forgetting factor algorithm according to the forgetting factor and the average power value.

2. The WLAN system dynamic channel allocation method according to claim 1, wherein the determining whether the measurement is completed by comparing the frequency point value to be detected with the end point value of the frequency point in the target area specifically comprises:

comparing the frequency point value to be detected with the end point value of the frequency point in the target area, and if the frequency point value to be detected is smaller than the end point value of the frequency point in the target area, judging that the measurement is not finished;

and if the frequency point value to be detected is greater than or equal to the end point value of the frequency point in the target area, judging that the measurement is finished.

3. A WLAN system dynamic channel allocation system is characterized in that the system comprises a frequency point selection module, a level measurement module, a time accumulation average module, a measurement judgment module, an optimal frequency point selection module and a dynamic channel allocation module;

the frequency point selection module is used for selecting a frequency point value to be detected in a frequency point range in a target area; the frequency point value to be detected is the starting point value of the frequency point in the target area;

the level measurement module is used for calculating the average power value of all signals under the frequency point value to be detected according to the sampling value in the preset time and the frequency point value to be detected;

the time accumulation average module is used for measuring the channel interference of the frequency point to be detected, and an average algorithm is adopted to obtain an average level measurement value according to the smooth length and the average power value; or obtaining an average level measurement value by adopting a forgetting factor algorithm according to a forgetting factor and the average power value;

the measurement judging module is used for judging whether the measurement is finished or not by comparing the frequency point value to be detected with the final point value of the frequency point in the target area; if the measurement is not finished, shifting the frequency point value to be detected forward by a preset frequency point interval of 1 unit, taking the shifted frequency point value as the frequency point value to be detected, and performing channel interference measurement again according to the time accumulation average module;

the optimal frequency point selection module is used for selecting an optimal frequency point according to a plurality of average level measurement values corresponding to all frequency point values to be detected when the measurement judgment module judges that the measurement is finished; the method specifically comprises the following steps: calculating the number of frequency points required by the access point according to the upward rounding operator and the actual signal bandwidth of all the access points; calculating a plurality of interference power sums in all adjacent frequency points according to the average level measured value, and comparing the interference power sums one by one to obtain a minimum interference power sum, wherein the minimum interference power sum and the corresponding frequency point are optimal frequency points; the adjacent frequency points are the frequency points with the adjacent quantity being the number of the frequency points;

and the dynamic channel allocation module is used for allocating dynamic channels of the WLAN system according to the optimal frequency point.

4. The WLAN system dynamic channel allocation system of claim 3, wherein the measurement determination module is specifically configured to:

comparing the frequency point value to be detected with the end point value of the frequency point in the target area, and if the frequency point value to be detected is smaller than the end point value of the frequency point in the target area, judging that the measurement is not finished; and if the frequency point value to be detected is greater than or equal to the end point value of the frequency point in the target area, judging that the measurement is finished.

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