JP6450260B2 - Access point control device, access point control method, and access point control program - Google Patents

Description

  The present invention relates to an access point control apparatus, an access point control method, and an access point control program that control channel assignment of a plurality of wireless access points.

  As a method of determining a channel through which a wireless access point (AP) communicates with a terminal, there is a method of determining and determining the state of another access point adjacent to each access point (see, for example, Non-Patent Document 1). . FIG. 18 is a block diagram illustrating a configuration of a system that centrally performs the method described in Non-Patent Document 1 on a server. In this system, control transmission / reception devices 21 and 22 are connected to all access points (AP) 31 and 32 that are performing wireless communication with terminals 41, 42, 43, and 44, respectively. And it comprises the server 10 which can control all the access points 31 and 32 by communicating with the transmission / reception apparatuses 21 and 22. FIG.

  Next, the configuration of the server 10 shown in FIG. 18 will be described with reference to FIG. FIG. 19 is a block diagram showing a configuration of the server 10 shown in FIG. The receiving device 1 acquires AP peripheral received power information that is the power of other access points received in all channels that can be received by each access point, and stores the AP peripheral received power information in the AP peripheral received power information storage device 2. The channel determination device 3 transmits a command to use a channel with less interference power from the AP peripheral reception power information via the transmission device 4 for each access point.

  20 to 25 are diagrams illustrating an example in which channels are allocated to each access point according to the conventional technology. In the order of AP2, AP4, AP1, AP3, and AP5, channels having a smaller sum of received power from other access points in each channel are allocated. Channels that can be used are three channels, channel 1, channel 5, and channel 9, which do not interfere with each other. In addition, it is assumed that the access point (other AP) used by another system uses the channel 3.

  In the access point (AP2), the interference power of all usable channels (here, channels 1, 5, and 9) is 0 (see FIG. 20). For this reason, channel 1 is assigned to the access point (AP2), and a beacon signal is transmitted on channel 1.

  In the access point (AP4), the interference powers of all usable channels (here, channels 5 and 9) other than channel 1 are 0 (see FIG. 21). For this reason, channel 5 is assigned to the access point (AP4), and a beacon signal is transmitted on channel 5.

  The access point (AP1) has the minimum interference power of the channel 9 (see FIG. 22). For this reason, channel 9 is assigned to the access point (AP1), and a beacon signal is transmitted on channel 9.

  The access point (AP3) has the lowest interference power of channel 1 among the usable channels (channels 1, 5, and 9) (see FIG. 23). For this reason, channel 1 is assigned to the access point (AP3), and a beacon signal is transmitted on channel 1.

  The access point (AP5) has the lowest interference power of channel 9 among the available channels (see FIG. 24). For this reason, channel 9 is assigned to the access point (AP5), and a beacon signal is transmitted on channel 9. In the prior art, channel allocation is performed in this way.

  FIG. 25 is a table showing the interference power values received by each access point after all access points have been assigned channels according to the prior art. Here, the power P received from the access point used by the other system to the usable channel is the interference power Pi received in the channel used by the other system and the bandwidth W of the usable channel. From the interfering bandwidth Wi, P = PiWi / W.

  Also, here, the usable channel bandwidth is 20 MHz, the channel 1 and channel 3 interference bandwidth is 10 MHz, the channel 5 and channel 3 interference bandwidth is 10 MHz, the channel 9 and channel 3 are The interfering bandwidth is 0 MHz, and 0 when the power received from another access point is 0.2 or less.

“Channel Allocation Method Considering Intra-channel Contention and Inter-channel Interference of Wireless LAN Access Points”, IEICE Technical Report, Vol. 112, no. 288, pp. 59-64, November 2012

  However, since the access point according to the prior art allocates a channel with low interference power from other access points, there is a problem that it is difficult to reduce the sum of interference power received by all access points. Further, in the prior art, since channels are allocated regardless of the traffic volume, a channel with low interference power cannot be allocated to an access point that generates a lot of traffic between each access point and a terminal that performs communication. There is also a problem.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an access point control device, an access point control method, and an access point control program that can reduce interference power received by an access point. To do.

  One aspect of the present invention is an access point control apparatus that allocates channels to be used to a plurality of access points that perform wireless communication with a terminal apparatus, and collects received power information from each of the access points. When the interference power for each channel is estimated based on the information collection means and the received power information, the access point that maximizes the estimated interference power is selected, and the selected access point is assigned to another channel A channel-by-channel interference estimation unit that calculates a sum of interference powers of all the access points with respect to the channel, and a channel determination unit to allocate to the access point that has selected a channel that minimizes the sum of the interference powers of the channels. An access point control device.

  One aspect of the present invention is an access point control apparatus that allocates channels to be used to a plurality of access points that perform radio communication with a terminal apparatus, and includes reception power information and traffic information from each of the access points. Based on the received power information and the traffic information, the product of interference power and traffic volume for each channel is estimated, and the product of the estimated interference power and traffic volume is maximized. A channel-by-channel interference estimation unit that calculates a sum of products of the interference power and the traffic amount of all the access points when the selected access point is assigned to another channel; A channel that minimizes the sum of products of the interference power and the traffic volume for each channel. An access point control apparatus and a channel decision means for allocating to said selected access point the panel.

  One aspect of the present invention is an access point control method performed by an access point control apparatus that allocates channels to be used to a plurality of access points that perform wireless communication with a terminal apparatus, each of the access points An information collecting step for collecting received power information; estimating interference power for each channel based on the received power information; selecting an access point having the maximum estimated interference power; An interference estimation step for each channel that calculates a sum of interference powers of all the access points when assigned to a channel; and for the access point that has selected a channel that minimizes the sum of the interference powers for each channel. And an access point control method comprising: A.

  One aspect of the present invention is an access point control method performed by an access point control apparatus that allocates channels to be used to a plurality of access points that perform wireless communication with a terminal apparatus, each of the access points An information collection step for collecting received power information and traffic information; a product of interference power and traffic volume for each channel is estimated based on the received power information and traffic information; and the estimated interference power and traffic volume Channel that calculates the sum of products of the interference power and the traffic amount of all the access points when the selected access point is assigned to another channel. An interference estimation step, the interference power for each channel, and the interference power The sum of the product of the traffic amount is an access point control method and a channel decision step of allocating to the access point selects a channel having the minimum.

  One aspect of the present invention is an access point control program for causing a computer to function as the access point control device.

  According to the present invention, it is possible to reduce the interference power received by the access point.

It is a block diagram which shows the structure of the server 10 by 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the interference estimation apparatus 5 for each channel of the server 10 shown in FIG. 1, and the channel determination apparatus 6. FIG. It is a figure which shows the example of the received power value in the other access point received in all the channels which each access point can receive. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a block diagram which shows the structure of the server 10 by 2nd Embodiment of this invention. 10 is a flowchart illustrating operations of the channel-by-channel interference estimation device 8 and the channel determination device 6 of the server 10 illustrated in FIG. 9. It is a figure which shows the example of the power value of the other access point received in all the channels which each access point can receive, and the traffic amount of each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a figure which shows the operation example which allocates a channel to each access point. It is a block diagram which shows the structure of the system which performs the method of a prior art intensively in a server. It is a block diagram which shows the structure of the server 10 shown in FIG. It is a figure which shows the example which allocates a channel to each access point by a prior art. It is a figure which shows the example which allocates a channel to each access point by a prior art. It is a figure which shows the example which allocates a channel to each access point by a prior art. It is a figure which shows the example which allocates a channel to each access point by a prior art. It is a figure which shows the example which allocates a channel to each access point by a prior art. It is the figure which tabulated the value of the interference power which each access point receives after all the access points were assigned the channel by the prior art.

<First Embodiment>
Hereinafter, an access point control apparatus according to a first embodiment of the present invention will be described with reference to the drawings. Since the system configuration in the first embodiment is the same as the configuration shown in FIG. 18, detailed description thereof is omitted here. A server 10 capable of controlling all access points 31 and 32 by connecting control transmission / reception devices 21 and 22 to all access points 31 and 32 constituting a wireless network and communicating with the transmission / reception devices 21 and 22, respectively. Consists of. However, in the first embodiment, the configuration of the server 10 is different as shown in FIG.

  The server 10 in the first embodiment controls channel assignment of access points using a method that does not require traffic information. Here, the usable channels are three channels, channel 1, channel 5, and channel 9, which do not interfere with each other, and beacon signals are transmitted from all access points 31 and 32 so that other access points can detect them. Set to. In addition, it is assumed that the access point used by another system uses channel 3.

  FIG. 1 is a block diagram illustrating a configuration of the server 10. In this figure, the same parts as those in the conventional apparatus shown in FIG. The server 10 shown in this figure is different from the conventional server 10 in that a channel-by-channel interference estimation device 5 and a channel determination device 6 are provided.

  The receiving apparatus 1 acquires AP peripheral received power information, which is the power of other access points received in all channels that can be received by each access point, from each access point, and stores it in the AP peripheral received power information storage apparatus 2. To do.

  The channel-by-channel interference estimation device 5 accesses the sum of the power received from other access points over the threshold value, assuming that channel 1 is assigned to all access points except access points used by other systems. Calculate for each point.

  Then, select the unselected access point that has the maximum power sum other than 0, and calculate the sum of the power of all access points when the selected access point is assigned to another usable channel. To do.

  Here, the power P received by the channel that can be used from the access point used by the other system interferes with the power Pi received by the channel used by the other system and the bandwidth W of the usable channel. P = PiWi / W from the current bandwidth Wi.

  The channel determination device 6 sends a command to the transmission device 4 to assign a channel that minimizes the sum of the interference power for each channel obtained from the channel interference estimation device 5 to the access point selected by the channel interference estimation device 5. Send through.

  Next, the channel-by-channel interference estimation device 5 assumes that the channel determined by the channel determination device 6 is assigned to the selected access point, and that the channel 1 is assigned to the unselected access point. The sum of the power received from the points that exceeds the threshold is calculated for each access point.

  Then, select the unselected access point that has the maximum power sum other than 0, and calculate the sum of the power of all access points when the selected access point is assigned to another usable channel. To do.

  Here, the power P received from the access point used by the other system to the usable channel is the interference power Pi received in the channel used by the other system and the bandwidth W of the usable channel. From the interfering bandwidth Wi, P = PiWi / W.

  The channel determination device 6 sends a command to the transmission device 4 to assign a channel that minimizes the sum of the interference power for each channel obtained from the channel interference estimation device 5 to the access point selected by the channel interference estimation device 5. Send through.

  The above is repeated, and in channel-by-channel interference estimation apparatus 5, when the sum of interference power received by all unselected access points from other access points is 0, channel determination apparatus 6 determines all unselected access points. A command for assigning channel 1 to is transmitted via the transmission device 4.

  Next, with reference to FIG. 2, the channel allocation operation performed by the channel-by-channel interference estimation device 5 and the channel determination device 6 of the server 10 shown in FIG. 1 will be described. FIG. 2 is a flowchart showing operations of the per-channel interference estimation device 5 and the channel determination device 6 of the server 10 shown in FIG.

  First, the channel-by-channel interference estimation apparatus 5 calculates the received power of each access point in channel 1 assuming that each access point uses channel 1 (step S1). When there is an access point of another system, it is calculated by converting to the power received by channel 1. The power below the threshold is assumed to be zero.

  Next, the channel determination device 6 selects the access point having the highest received power other than 0 from among the unselected access points of the channel 1 (step S2). And the channel determination apparatus 6 determines whether it is not applicable (step S3).

  As a result of this determination, if there is a corresponding one, the channel-by-channel interference estimation device 5 calculates the sum of the received power of all the access points when the selected access point is changed to another usable channel for each usable channel. (Step S4). When there is an access point of another system, it is calculated by converting to the power received on the usable channel. The power below the threshold is assumed to be zero.

  Next, the channel determination device 6 determines whether or not the sum of the received power is minimum and smaller than the value before the channel change (step S5). As a result of this determination, if “the sum of received power is minimum and smaller than the value before channel change” is not satisfied, the channel determination device 6 assigns the channel 1 to the selected access point (step S6). Then, the process returns to step S2.

  On the other hand, when “the sum of received power is minimum and smaller than the value before the channel change” is satisfied, the channel determination device 6 assigns the channel to the selected access point (step S7). Then, the process returns to step S2.

  Finally, if it is determined in step S3 that there is no corresponding, the channel determination device 6 assigns channel 1 to the unselected access point (step S8).

  Next, referring to FIGS. 3 to 8, the above-described channel assignment operation will be described with a specific example. FIG. 3 is a diagram illustrating an example of received power values at other access points received in all channels that can be received by each access point. 4 to 8 are diagrams illustrating an operation example in which a channel is allocated to each access point. Here, the threshold of power received from another access point is set to 0.2. Further, the usable channel bandwidth is 20 MHz, the channel 1 and channel 3 interference bandwidth is 10 MHz, the channel 5 and channel 3 interference bandwidth is 10 MHz, and the channel 9 and channel 3 interference. The bandwidth that is used is 0 MHz.

  First, it is assumed that channel 1 is allocated to all access points except for access points (other APs) used by other systems, and the sum of power received from other access points is equal to or greater than a threshold ( Here, the access point (AP4) which becomes 4.0) is selected (see FIG. 4).

  Next, when the access point (AP4) is assigned to channel 1, the sum of the powers of all access points is 14.5 (3.0 + 2.0 + 2.5 + 4.0 + 3.0), and is assigned to channel 5 The sum of the powers of all the access points 7.5 (2.0 + 1.0 + 2.0 + 0 + 2.0 + 0.5) (see FIG. 5) and all the access points when assigned to channel 9 (see FIG. 6) The smallest channel 9 is assigned to the access point (AP4) from the sum of powers 7.0 (2.0 + 1.0 + 2.0 + 2.0).

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (AP1) that maximizes the sum of power received from other access points is equal to or greater than the threshold (AP1). (See FIG. 6).

  Next, when the access point (AP1) is assigned to channel 1, the sum of the powers of all the access points is 7.0 (2.0 + 1.0 + 2.0 + 2.0), and when assigned to channel 5 (FIG. 7), the power sum 3.0 (0.5 + 1.0 + 1.5) of all access points, and the power sum 5.0 of all access points when assigned to channel 9 (not shown) To the smallest channel 5 is assigned to the access point (AP1).

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (AP5) that maximizes the sum of power received from other access points is equal to or greater than a threshold value is selected (AP5). (See FIG. 7).

  Next, when the access point (AP5) is assigned to channel 1, the sum of the powers of all access points is 3.0 (0 + 0.5 + 1.0 + 1.5), and when assigned to channel 5 (see FIG. 8). ) Of the interference power of all the access points 1.5 (0.25 + 0.5 + 0.75) and the sum of the powers of all the access points when assigned to the channel 9 (not shown) 2.25 Assign the smallest channel 5 to the access point (AP5).

  Next, assuming that channel 1 is allocated to an unselected access point, an unselected access point (AP2) that maximizes the sum of powers received from other access points that are equal to or greater than a threshold value is selected ( (See FIG. 8).

  Next, when the access point (AP2) is assigned to channel 1, the sum of the powers of all access points is 1.5 (0.25 + 0.5 + 0.75), and when assigned to channel 5 (not shown). The access point (AP2) has the smallest channel 1 from the sum of powers of all access points of 3.0 and the sum of powers of all access points assigned to channel 9 (not shown) 3.25. Assign to.

  Next, since the unselected access point (AP3) has zero interference power received from other access points, channel 1 is assigned to the access point (AP3).

  In this way, AP peripheral received power information is acquired from all access points in the wireless network, interference power is estimated for each channel, and channels are allocated from access points with large interference, thereby suppressing interference of the entire wireless network. be able to.

  In particular, a method that does not require traffic information is an effective method even when there is no traffic information, such as immediately after the construction of a wireless network. For this reason, it is possible to operate the wireless network by a method that does not require traffic information, and switch to a method that uses the traffic information after accumulating the traffic information.

Second Embodiment
Next, an access point control apparatus according to a second embodiment of the present invention will be described. Since the system configuration in the second embodiment is the same as the configuration shown in FIG. 18, detailed description thereof is omitted here. A server 10 capable of controlling all access points 31 and 32 by connecting control transmission / reception devices 21 and 22 to all access points 31 and 32 constituting a wireless network and communicating with the transmission / reception devices 21 and 22, respectively. Consists of. However, in the second embodiment, the configuration of the server 10 is different as shown in FIG.

  The server 10 in the second embodiment controls channel assignment of access points using traffic information. Here, the usable channels are three channels, channel 1, channel 5, and channel 9, which do not interfere with each other, and beacon signals are transmitted from all access points 31 and 32 so that other access points can detect them. Set to. In addition, it is assumed that the access point used by another system uses channel 3.

  FIG. 9 is a block diagram illustrating a configuration of the server 10 according to the second embodiment. In this figure, the same parts as those in the apparatus shown in FIG. The server 10 shown in this figure is different from the server 10 shown in FIG. 18 in that an AP traffic information storage device 7 and a channel-by-channel interference estimation device 8 are further provided.

  The receiving apparatus 1 acquires AP peripheral received power information, which is the power of other access points received in all channels that can be received by each access point, from each access point, and stores it in the AP peripheral received power information storage apparatus 2. To do. In addition, the receiving device 1 acquires AP traffic information that is the total traffic amount between the access point and the terminal from each access point, and stores the AP traffic information in the AP traffic information storage device 7.

  The channel-by-channel interference estimation device 8 assumes that channel 1 is assigned to all access points except for access points used by other systems, and sums and sums of powers received from other access points that exceed the threshold. Calculate the traffic volume product for each access point.

  Then, an unselected access point whose product of the sum of power and the total traffic amount is the maximum other than 0 is selected, and all access points when the selected access point is assigned to another usable channel Calculate the product of the sum of power and total traffic.

  Here, the power P received by the channel that can be used from the access point used by the other system interferes with the power Pi received by the channel used by the other system and the bandwidth W of the usable channel. P = PiWi / W from the current bandwidth Wi.

  The channel determination device 6 uses the channel that minimizes the sum of the products of the interference power for each channel and the total traffic obtained from the interference estimation device 8 for each access point selected by the interference estimation device 8 for each channel. A command for assigning is transmitted via the transmission device 4.

  Next, the channel-by-channel interference estimation apparatus 8 assigns the channel determined by the channel determination apparatus 6 to the selected access point, and assumes that the channel 1 is allocated to the unselected access point. The product of the sum of the power received from the point and above the threshold and the total traffic volume is calculated for each access point.

  Then, an unselected access point whose product of the sum of power and the total traffic amount is the maximum other than 0 is selected, and all access points when the selected access point is assigned to another usable channel Calculate the product of the sum of power and total traffic.

  Here, the power P received from the access point used by the other system to the usable channel is the interference power Pi received in the channel used by the other system and the bandwidth W of the usable channel. From the interfering bandwidth Wi, P = PiWi / W.

  The channel determination device 6 uses the channel that minimizes the sum of the products of the interference power for each channel and the total traffic obtained from the interference estimation device 8 for each access point selected by the interference estimation device 8 for each channel. A command for assigning is transmitted via the transmission device 4.

  By repeating the above, in the channel-by-channel interference estimation device 8, when the product of the sum of the interference power and the total traffic amount received by other unselected access points from other access points is 0, the channel determination device 6 A command for assigning channel 1 to an unselected access point is transmitted via the transmitter 4.

  Next, with reference to FIG. 10, the channel allocation operation performed by the channel-by-channel interference estimation device 8 and the channel determination device 6 of the server 10 shown in FIG. 9 will be described. FIG. 10 is a flowchart showing the operations of the per-channel interference estimation device 8 and the channel determination device 6 of the server 10 shown in FIG.

  First, the channel-by-channel interference estimation device 8 assumes that each access point is using channel 1, and calculates the product of the received power and traffic of each access point in channel 1 (step S11). When there is an access point of another system, it is calculated by converting to the power received by channel 1. The power below the threshold is assumed to be zero.

  Next, the channel determination device 6 selects the largest access point with a product of received power and traffic other than 0 from unselected access points of channel 1 (step S12). And the channel determination apparatus 6 determines whether it is not applicable (step S13).

  As a result of this determination, if there is a corresponding one, the channel-by-channel interference estimation device 8 can use the sum of the product of the received power and traffic of all the access points when the selected access point is changed to another usable channel. Calculation is performed for each channel (step S14). When there is an access point of another system, it is calculated by converting to the power received on the usable channel. The power below the threshold is assumed to be zero.

  Next, the channel determination device 6 determines whether or not the sum of the product of the received power and traffic is minimum and smaller than the value before the channel change (step S15). If the result of this determination does not satisfy “the sum of the product of received power and traffic is minimum and smaller than the value before channel change”, the channel determination device 6 assigns channel 1 to the selected access point (step S16). Then, the process returns to step S12.

  On the other hand, if “the sum of products of received power and traffic is minimum and smaller than the value before the channel change” is satisfied, the channel determination device 6 assigns the channel to the selected access point (step S17). Then, the process returns to step S12.

  Finally, when it is determined in step S13 that there is no corresponding condition, the channel determination device 6 assigns channel 1 to an unselected access point (step S18).

  Next, with reference to FIGS. 11 to 17, the above-described channel assignment operation will be described with a specific example. FIG. 11 is a diagram illustrating an example of power values of other access points and traffic amounts of the access points received in all channels that can be received by the access points. 12 to 17 are diagrams illustrating an operation example in which a channel is allocated to each access point. Here, the threshold of power received from another access point is set to 0.2. Further, the usable channel bandwidth is 20 MHz, the channel 1 and channel 3 interference bandwidth is 10 MHz, the channel 5 and channel 3 interference bandwidth is 10 MHz, and the channel 9 and channel 3 interference. The bandwidth that is used is 0 MHz.

  First, it is assumed that channel 1 is allocated to all access points except access points (other APs) used by other systems, and the sum of the power received from other access points and the total traffic exceeding the threshold value. The access point (AP5) having the maximum product (150.0) is selected (see FIG. 12).

  Next, the sum 390 (90.0 + 20.0 + 50.0 + 80.0 + 150.0) of the product of the sum of the power of all the access points and the total traffic amount when the access point (AP5) is assigned to channel 1, and the channel 5 (see FIG. 13), the sum of the power of all the access points and the sum of the products of the total traffic 195 (75.0 + 17.5 + 30.0 + 60.0 + 12.5)) is assigned to channel 9. In this case (see FIG. 14), the channel 9 that is the minimum from the sum of the power of all the access points and the sum of products of the total traffic volume 182.5 (75.0 + 17.5 + 30.0 + 60.0) is assigned to the access point (AP5 ).

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (the product of the sum of the powers greater than or equal to the threshold received from the other access points and the total traffic amount is maximized) ( AP1) is selected (see FIG. 14).

  Next, 182.5 (75.0 + 17.5 + 30.0 + 60.0) of the sum of the power of all access points and the total traffic amount when the access point (AP1) is assigned to the channel 1, and the channel 5 (see FIG. 15), the sum of the power of all the access points and the sum of products of the total traffic volume 62.5 (12.5 + 10.0 + 40.0), and when assigned to channel 9 ( (See FIG. 16), the channel 5 that is the minimum from the sum of the power of all access points and the sum of products of the total traffic volume 102.5 (12.5 + 10.0 + 40.0 + 15.0 + 25.0) is assigned to the access point (AP1). Assign to.

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (the product of the sum of the powers greater than or equal to the threshold received from the other access points and the total traffic amount is maximized) ( AP4) is selected (see FIG. 15).

  Next, the sum 62.5 of the product of the sum of the power of all access points and the total traffic amount when the access point (AP4) is assigned to the channel 1, and the case where it is assigned to the channel 5 (not shown). The sum 62.5 of the product of the sum of the powers of all the access points and the total traffic amount, and the sum 72 of the product of the sum of the powers of all the access points and the total traffic amount when assigned to the channel 9 (not shown) .5 is assigned to the access point (AP4).

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (the product of the sum of the powers greater than or equal to the threshold received from the other access points and the total traffic amount is maximized) ( AP2) is selected (see FIG. 15).

  Next, the sum 62.5 of the product of the sum of the power of all access points and the total traffic amount when the access point (AP2) is assigned to the channel 1 and the case where the access point (AP2) is assigned to the channel 5 (not shown). The sum 52.5 of the sum of the power of all the access points and the total traffic amount, and the sum of the sum of the power of all the access points and the sum of the total traffic amount when assigned to the channel 9 (see FIG. 17) 45 (10.0 + 20.0 + 2.5 + 12.5) and the smallest channel 9 is assigned to the access point (AP2).

  Next, assuming that channel 1 is assigned to an unselected access point, an unselected access point (the product of the sum of the powers greater than or equal to the threshold received from the other access points and the total traffic amount is maximized) ( AP3) is selected (see FIG. 17).

  Next, when the access point (AP3) is assigned to the channel 1, the sum 45 of the product of the sum of the power of all the access points and the total traffic amount (10.0 + 20.0 + 2.5 + 12.5) and the channel 5 Sum of powers of all access points when assigned (not shown) and sum 75 of products of total traffic amount, and sum and sum of powers of all access points when assigned to channel 9 (not shown) The smallest channel 1 is assigned to the access point (AP3) from the sum 95 of the traffic volume products.

  In this way, AP peripheral received power information and traffic information are obtained from all access points in the wireless network, and the product of the sum of interference power and the total traffic amount is estimated for each channel, and the access point having large interference and traffic amount By allocating the channel, the interference of the entire wireless network can be suppressed, and a channel with less interference power can be allocated to an access point with a high traffic.

  As described above, the service area of the wireless network can be expanded by controlling the channel assignment of a plurality of adjacent wireless access points. Further, the interference power received by all access points can be reduced. In addition, a channel with less interference power can be allocated to an access point that generates a lot of traffic between the access point and a terminal that performs communication.

  You may make it implement | achieve all or one part of the server 10 in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Therefore, additions, omissions, substitutions, and other modifications of the components may be made without departing from the technical idea and scope of the present invention.

  It can be applied to an application in which it is essential to control channel assignment of a plurality of wireless access points to reduce interference power received by the access points.

  DESCRIPTION OF SYMBOLS 1 ... Reception apparatus, 2 ... AP periphery received power information storage apparatus, 4 ... Transmission apparatus, 5, 8 ... Interference estimation apparatus for every channel, 6 ... Channel determination apparatus, 7 ... AP traffic information storage device

Claims (5)

An access point control device that assigns channels to be used to a plurality of access points that perform wireless communication with a terminal device,
Information collecting means for collecting AP peripheral received power information that is power of other access points received in all channels that can be received by the access point including channels used by other systems from each of the access points ;
Based on the AP peripheral reception power information, the interference power for all the access points for each channel that can be used by the own system is estimated, the access point with the estimated maximum interference power is selected, and the selected access point Per-channel interference estimation means for calculating the sum of interference powers for all the access points for the case where is assigned to another channel;
An access point control apparatus comprising: channel determining means for allocating to the access point that has selected the channel that minimizes the sum of the interference power for each channel. An access point control device that assigns channels to be used to a plurality of access points that perform wireless communication with a terminal device,
Information that collects AP peripheral received power information and traffic information, which is the power of other access points received in all channels that can be received by the access point, including channels used by other systems, from each of the access points Collecting means;
Based on the AP peripheral reception power information and the traffic information, a product of interference power and traffic volume for all the access points for each channel that can be used by the own system is estimated, and the estimated interference power and traffic volume select the access point at which the product is largest, each channel computing the sum of the product of the interference power and the traffic volume for all of the access points for the case where the selected access point is assigned to the other channel interference An estimation means;
An access point control apparatus comprising: channel determining means for allocating to the selected access point a channel that minimizes a sum of products of the interference power and the traffic amount for each channel. An access point control method performed by an access point control device that assigns channels to be used to a plurality of access points that perform wireless communication with a terminal device,
An information collecting step of collecting AP peripheral received power information, which is power of other access points received in all channels that can be received by the access point including channels used by other systems, from each of the access points ;
Based on the AP peripheral reception power information, the interference power for all the access points for each channel that can be used by the own system is estimated, the access point with the estimated maximum interference power is selected, and the selected access point A channel-by-channel interference estimation step for calculating a sum of interference powers for all the access points for the case where is assigned to another channel;
An access point control method comprising: a channel determination step for allocating to the access point that has selected the channel that minimizes the sum of the interference power for each channel. An access point control method performed by an access point control device that assigns channels to be used to a plurality of access points that perform wireless communication with a terminal device,
Information that collects AP peripheral received power information and traffic information, which is the power of other access points received in all channels that can be received by the access point, including channels used by other systems, from each of the access points A collection step;
Based on the AP peripheral reception power information and the traffic information, a product of interference power and traffic volume for all the access points for each channel that can be used by the own system is estimated, and the estimated interference power and traffic volume select the access point at which the product is largest, each channel computing the sum of the product of the interference power and the traffic volume for all of the access points for the case where the selected access point is assigned to the other channel interference An estimation step;
An access point control method comprising: a channel determination step for allocating to a selected access point a channel having a minimum sum of products of the interference power and the traffic amount for each channel.   An access point control program for causing a computer to function as the access point control device according to claim 1.

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