JP2020162009A - Information processing device, radio wave state detection method and program - Google Patents

Abstract

To contribute to selection of a satisfactory communication channel for a communication device which communicates with an access point.SOLUTION: A mobile terminal device is an information processing device which includes: a detection result which detects a radio wave emitted from an access point and/or a home electric appliance at a first place or a second place different from the first place; and a processing unit which performs predetermined processing based on a detection result of the first radio wave at the first place and a detection result of the second radio wave at the second place. The predetermined processing displays an optimal communication channel at both of the first place and the second place to urge to change a communication channel selected by the access point.SELECTED DRAWING: Figure 2

Description

The present invention relates to an information processing device, a radio wave state detection method, and a program.

Conventionally, there has been known a technique in which an access point selects a channel. As a technique of this kind, there is a wireless communication method described in Patent Document 1 below. This wireless communication method is a technology in which each access point selects a channel independently in a distributed manner. In this wireless communication method, the access point comprises a wireless network interface that can be switched between a plurality of wireless communication channels. The access point monitors each of the monitored channels from multiple communication channels over a period of time, identifies transmissions that may interfere on the monitored channel, and calculates interference metrics for the monitored channel. And remember. The access point compares the stored interference metrics for multiple monitored channels and selects the monitored channel with the lowest interference metric as the communication channel.

JP-A-2018-196129

By the way, in a wireless LAN (Local Area Network) system, a device connected to the wireless LAN may perform collision avoidance, and there is a problem of exposed terminal caused by collision avoidance. Examples of the collision avoidance method include CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) in IEEE802.11. The access point scans all communication channels at startup and selects the best communication channel where the access point resides. It is assumed that two access point AP # 1 (inside the home) and access point AP # 2 (outside the home) select the optimum communication channel by the same processing.

Then, the two access points may select the same communication channel as the optimum communication channel. In this case, if there is a home appliance controlled by the access point AP # 1 between the two access points, the home appliance is not only the signal of the access point AP # 1 but also the access point AP # 2. The signal of is also received, and there are many opportunities to stop the transmission to the access point AP # 1 by CAMA / CA. As a result, problems such as a slow communication speed between the access point and the home electric appliance and the inability to establish a connection occur.

Further, in the wireless LAN system using the 2.4 GHz band, the interval between the center frequencies of each communication channel is narrower than the bandwidth of each communication channel, so that the adjacent communication channels overlap each other. Therefore, when the communication channel selected by the access point AP # 1 and the communication channel selected by the access point AP # 2 are adjacent to each other, the signals exchanged on each other's communication channels cannot be recognized as wireless LAN signals. Therefore, collision avoidance by CSMA / CA cannot be performed, and there is a problem that the communication quality of the access point AP # 1 deteriorates, the communication speed decreases, and the connection is disconnected.

The present invention has been made in view of the above problems, and is an information processing device, a radio wave state detection method, and a program that can contribute to selecting a good communication channel for a communication device that communicates with an access point. Is intended to provide.

(1) One aspect of the present invention includes a detection unit that detects radio waves emitted from an access point at a first place and a second place different from the first place, and a first place at the first place. It is an information processing apparatus including a processing unit that performs a predetermined process based on the detection result of the radio wave of 1 and the detection result of the second radio wave at the second place.

(2) One aspect of the present invention is the above-mentioned information processing apparatus, in which the predetermined processing is performed on the detection result of the first radio wave at the first place and the second radio wave at the second place. The process may be a process of displaying the optimum communication channel at both the first location and the second location based on the comparison with the detection result.

(3) One aspect of the present invention is the above-mentioned information processing apparatus, in which the predetermined processing is performed on the detection result of the first radio wave at the first place and the second radio wave at the second place. It may be a process of prompting the change of the communication channel selected by the access point based on the comparison with the detection result.

(4) One aspect of the present invention is the above-mentioned information processing device, further including an operation unit that accepts a user's operation, and the second place is farther from the access point than the first place. The predetermined processing is a place, and the first place and the first place are based on the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place. Optimal communication channels in both the first location and the second location based on the process of prompting the selection of the optimum communication channel in both of the two locations and the user's operation accepted by the operation unit. May include a process of requesting the access point to change the communication channel when is selected.

(5) One aspect of the present invention is the above-mentioned information processing device, further including an operation unit that accepts a user's operation, and the detection unit has the access according to the user's operation received by the operation unit. Detecting the radio wave emitted from the point, the processing unit sets the location of its own device as the second location, and the detection result of the first radio wave at the first location and the second at the second location. The optimum communication channel may be selected in both the first place and the second place based on the detection result of the radio wave.

(6) One aspect of the present invention is the above-mentioned information processing apparatus, and the processing unit has at least a detection result of a first radio wave in the first place and a second in the second place. Based on the radio wave detection result, map information in which image information representing the radio wave intensity for each communication channel is arranged at each location in a predetermined space may be generated.

(7) One aspect of the present invention is the information processing apparatus, wherein the processing unit has at least a detection result of a first radio wave in the first place and a second radio wave in the second place. Based on the radio wave detection result, map information may be generated in which image information indicating the superiority or inferiority of radio wave interference for each communication channel is arranged at each location in a predetermined space.

(8) One aspect of the present invention is a method of detecting radio waves emitted from an access point at a first location and emitting radio waves from the access point at a second location different from the first location. A radio wave condition detection method that detects a radio wave and performs a predetermined process based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. is there.

(9) One aspect of the present invention is a program of an information processing device, which causes the information processing device to detect radio waves emitted from an access point at a first location, and is different from the first location. A radio wave emitted from the access point is detected at the second location, and a predetermined value is determined based on the detection result of the first radio wave at the first location and the detection result of the second radio wave at the second location. It is a program that makes the processing of.

According to one aspect of the present invention, it is possible to contribute to selecting a communication channel that is good for the communication device that communicates with the access point.

It is a block diagram which shows an example of the wireless communication system which concerns on 1st Embodiment which applied this invention. It is a block diagram which shows an example of the functional structure in the wireless communication system which concerns on 1st Embodiment to which this invention is applied. It is a flowchart which shows the processing procedure of the mobile terminal apparatus in the wireless communication system which concerns on 1st Embodiment to which this invention was applied. It is a figure which shows an example of the 1st scan result and the 2nd scan result. It is a figure which shows another example of the 1st scan result. It is a figure which shows another example of the 2nd scan result. It is a figure which shows an example of the screen which contains the scan result. It is a figure which shows an example of the screen which includes a scan result and an operation button. It is a figure which shows another example of the screen which contains the scan result. It is a flowchart which shows the processing procedure of the mobile terminal apparatus in the wireless communication system which concerns on 2nd Embodiment which applied this invention. FIG. 11 shows (a) an example of scan results, (b) an example of an interference wave radio field intensity list by channel, (c) an example of an interference wave RSSI list by channel, and (d) by channel considering adjacent channels. It is a figure which shows an example of the interference wave RSSI list. FIG. 12 shows, in an embodiment, (a) a channel-specific interference wave RSSI list at a first location considered for adjacent channels, (b) a channel-specific interference wave RSSI list at a second location considered adjacent channels, and ( c) It is a figure which shows the average RSSI list of the interference wave by channel. FIG. 13 is a diagram showing (a) an example of a scan result, (b) an example of an interference wave radio field intensity list by channel, and (c) an example of an RSSI list by channel considering adjacent channels. It is a figure which shows an example of the map information of the position in a house, and the optimum channel in the wireless communication system which concerns on 3rd Embodiment to which this invention is applied. It is a figure which shows an example of the map information of the position in a house, and the superiority or inferiority of the interference situation in the wireless communication system which concerns on 3rd Embodiment to which this invention is applied.

Hereinafter, the information processing apparatus to which the present invention is applied, the radio wave state detection method, and the program will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a block diagram showing an example of a wireless communication system according to a first embodiment to which the present invention is applied. The wireless communication system includes, for example, an access point 100, a home electric appliance 200, and a mobile terminal device 300. The wireless communication system realizes data transmission / reception by wireless LAN, for example, in a house. The wireless communication system is, for example, a wireless LAN system using a 2.4 GHz band. The wireless communication system, for example, transmits an instruction based on a user's operation to the home electric appliance 200 as a control target device to monitor the state of the home electric appliance 200 and control the operation of the home electric appliance 200 by HEMS (Home Energy). We provide services that realize the Management System (Home Energy Management System).

In the wireless communication system, the access point 100 communicates with the home electric appliance 200 and the mobile terminal device 300 in the house, and therefore forms a communicable range 100a by transmitting radio waves with a predetermined radio wave strength. On the other hand, for example, it is assumed that the access point 100 # exists in a house next to the house where the access point 100 and the home electric appliance 200 exist. In this case, the home appliance 200 belongs to both the communicable range 100a of the access point 100 and the communicable range 100b of the access point 100 #, and may affect the communication quality. Therefore, the mobile terminal device 300 of the first embodiment has a function described later in order to contribute to selecting a good communication channel for the communication device communicating with the access point. In addition, contributing to selecting a good communication channel for the home electric appliance 200 that communicates with the access point means, for example, displaying a good communication channel for the home electric appliance 200 or a communication channel selected by the access point 100. Is to change.

FIG. 2 is a block diagram showing an example of a functional configuration in the wireless communication system according to the first embodiment to which the present invention is applied.

The access point 100 includes, for example, a wireless communication unit 102, a signal detection unit 104, a channel selection unit 106, and a communication control unit 108. The wireless communication unit 102 is a communication interface such as a NIC (Network Interface Card) or a wireless communication module. The wireless communication unit 102 is connected to the wireless LAN. Since the signal detection unit 104 communicates by, for example, the CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) method, the ESID (Extended) of the access point operating on the communication channel for each communication channel available in the wireless LAN Detects Service Set Identifier), BSSID (Basic Service Set Identify), and radio field strength. The channel selection unit 106 selects one of the communication channels available in the wireless LAN based on the signal detection result by the signal detection unit 104. The channel selection unit 106 calculates the SNR (Signal-to-Noise Ratio) for each communication channel and selects the best communication channel. The communication control unit 108 controls the communication processing of the wireless communication unit 102. Functional units such as the channel selection unit 106 and the communication control unit 108 are realized by, for example, a processor such as a CPU (Central Processing Unit) executing a program stored in the program memory. In addition, some or all of these functional parts may be realized by hardware such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array). It may be realized by the cooperation of software and hardware.

The home appliance 200 includes, for example, a wireless communication unit 202, a signal detection unit 204, a communication control unit 206, and an application processing unit 208. The wireless communication unit 202 is a communication interface such as a NIC or a wireless communication module. The wireless communication unit 202 is connected to the wireless LAN. The signal detection unit 204 detects radio waves in a wireless LAN because it communicates by, for example, a CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) method. The communication control unit 206 controls the wireless communication unit 202 so that the access point 100 communicates on the selected communication channel. Further, the communication control unit 206 causes communication by a CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) method based on the detection result of the signal detection unit 204. The application processing unit 208 performs processing for returning state information of the home electric appliance 200, processing for a control command of the home electric appliance 200, and the like. Functional units such as the communication control unit 206 and the application processing unit 208 are realized by, for example, a processor such as a CPU executing a program stored in the program memory. Further, a part or all of these functional units may be realized by hardware such as LSI, ASIC, or FPGA, or may be realized by cooperation between software and hardware.

The mobile terminal device 300 includes, for example, a wireless communication unit 302, a signal detection unit 304, a processing unit 306, and an interface unit 308. The wireless communication unit 302 is a communication interface such as a NIC or a wireless communication module. The wireless communication unit 302 is connected to the wireless LAN. The signal detection unit 304 detects radio waves emitted from the access point at the first location and a second location different from the first location. The processing unit 306 performs a predetermined process based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. The interface unit 308 displays various information. The interface unit 308 receives the user's operation and outputs a signal corresponding to the operation. The functional unit such as the processing unit 306 is realized by, for example, a processor such as a CPU executing a program stored in the program memory. Further, a part or all of these functional units may be realized by hardware such as LSI, ASIC, or FPGA, or may be realized by cooperation between software and hardware.

The first place is an arbitrary place in the home, and the second place is an arbitrary place in the home different from the first place. For example, the first location is a location near the access point 100, and the second location is a location near the home appliance 200 that is farther from the access point 100 than the first location.

The predetermined processing is, for example, in both the first place and the second place based on the comparison between the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place. This is a process to display the optimum communication channel. Further, the predetermined process displays the optimum communication channel at least in the second place based on the comparison between the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place. The predetermined process is optimal in the second place based on the comparison between the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place. It may be a process of displaying a communication channel. The comparison between the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place is, for example, the total value of the radio wave strength for each communication channel detected at the first place. This is a process of comparing the total value of the radio field strength for each communication channel detected at the second location with each communication channel.

The predetermined process is, for example, a process of prompting the access point to change the selected communication channel based on the comparison between the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. It may be there.

FIG. 3 is a flowchart showing a processing procedure of the mobile terminal device in the wireless communication system according to the first embodiment to which the present invention is applied. The mobile terminal device 300 first connects to the access point 100 and recognizes the BSSID of the access point 100 (step S100). Next, the mobile terminal device 300 scans the communication channel in the vicinity of the access point 100 (step S102). Next, the mobile terminal device 300 records the scan result in step S102 as the first scan result in the internal memory (not shown) (step S104). FIG. 4 is a diagram showing a first scan result and a second scan result. The first scan result is information in which the communication channel number, the ESID, the BSSID (for example, the MAC address), and the radio wave intensity are associated with each other.

Next, the mobile terminal device 300 scans the communication channel in the vicinity of the home appliance 200 (step S106). Next, the mobile terminal device 300 records the scan result in step S106 as a second scan result in an internal memory (not shown) (step S108). The second scan result is, for example, in FIG. 4, information having different ESID, BSSID, and radio field intensity for the communication channel. The second scan result is information in which the communication channel number, the ESID, the BSSID (for example, the MAC address), and the radio field strength are associated with each other.

Next, the mobile terminal device 300 executes a predetermined process based on the first scan result and the second scan result (step S110).

FIG. 5 is a diagram showing another example of the first scan result. According to FIG. 5, since the radio field strength of 6ch is low (the cleanest communication channel) in the vicinity of the access point 100, the access point 100 selects 6ch. FIG. 6 is a diagram showing another example of the second scan result. According to FIG. 6, since the radio field strength of 1ch is low (the cleanest communication channel) in the vicinity of the home appliance 200, it is estimated that 1ch is the optimum communication channel. The calculation method of the radio field intensity in each communication channel may be any known calculation method.

FIG. 7 is a diagram showing an example of a screen including a scan result. As shown in FIG. 7, the processing unit 306 has a screen including the BSSID of the access point 100, the communication channel number selected by the access point 100, and the optimum communication channel number in the vicinity of the home appliance 200 as a scan result. Is displayed by the interface unit 308. In the mobile terminal device 300, when the communication channel selected by the access point 100 is the optimum communication channel in both the first place and the second place, the optimum communication channel number in the vicinity of the home electric appliance 200 Instead, it may be displayed that the selected communication channel is the optimum communication channel in the vicinity of the home appliance 200.

FIG. 8 is a diagram showing an example of a screen including scan results and operation buttons. The processing unit 306 may display the screen as shown in FIG. 8 by the interface unit 308. On the screen shown in FIG. 8, as a scan result, the BSSID of the access point 100, the communication channel number selected by the access point 100, the optimum communication channel number in the vicinity of the home appliance 200, and the access point 100 being selected. A question prompting the optimum communication channel from the communication channel to the optimum communication channel near the home appliance 200, an operation button displayed as "Yes" to accept the communication channel change, and "No" to not accept the communication channel change. The operation buttons displayed as are included. The question prompting the change of the communication channel and the two operation buttons are examples of information prompting the change of the communication channel selected by the access point 100. When the communication channel selected by the access point 100 is the optimum communication channel in the second place, the mobile terminal device 300 can be used for the optimum communication channel number, question, and operation button in the vicinity of the home appliance 200. Instead, it may be displayed that the selected communication channel is the optimum communication channel in the vicinity of the home appliance 200.

When the mobile terminal device 300 receives an operation for the operation button displayed as "Yes", the mobile terminal device 300 may send a request to the access point 100 to change the communication channel to the access point 100. When the access point 100 receives a request to change the communication channel from the mobile terminal device 300, the access point 100 changes the communication channel from the selected communication channel to the requested communication channel.

FIG. 9 is a diagram showing another example of the screen including the scan result. The processing unit 306 may display the screen as shown in FIG. 9 by the interface unit 308. On the screen shown in FIG. 9, the BSSID of the access point 100, the communication channel number selected by the access point 100, the optimum communication channel number in the living room, and the optimum communication channel number in the bedroom are displayed as scan results. It is included.

According to the mobile terminal device 300 of the first embodiment described above, the signal detection unit 304 that detects the radio waves emitted from the access point at the first place and the second place different from the first place. A processing unit 306 that performs a predetermined process based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place is provided. According to the mobile terminal device 300, for example, as a predetermined process, the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place can be displayed. Thereby, according to the mobile terminal device 300, for example, as shown in FIG. 9, the optimum communication channel in the first place and the optimum communication channel in the second place can be presented to the user. As a result, according to the mobile terminal device 300, the user can be made aware of a good communication channel, which can contribute to selecting a good communication channel for the communication device communicating with the access point.

According to the mobile terminal device 300 of the first embodiment, for example, as shown in FIG. 7, the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place The optimum communication channel can be displayed in both the first place and the second place based on the comparison.

According to the mobile terminal device 300 of the first embodiment, for example, as shown in FIG. 8, the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place It is possible to prompt the access point 100 to change the selected communication channel based on the comparison.

According to the mobile terminal device 300 of the first embodiment, when the second place is a place farther from the access point 100 than the first place, the detection result of the first radio wave at the first place And, based on the detection result of the second radio wave in the second place, the optimum communication channel can be selected in both the first place and the second place.

(Second Embodiment)
Hereinafter, the second embodiment will be described. In the mobile terminal device 300 of the second embodiment, the signal detection unit 304 detects the radio wave emitted from the access point 100 in response to the user's operation received by the interface unit 308, and the processing unit 306 detects the radio wave emitted from the mobile terminal. With the location of the device 300 as the second location, the first location and the second location are based on the detection result of the first radio wave at the first location and the detection result of the second radio wave at the second location. It differs from the mobile terminal device 300 of the first embodiment in that the optimum communication channel is selected in both places. Hereinafter, the differences will be mainly described.

FIG. 10 is a flowchart showing a processing procedure of the mobile terminal device in the wireless communication system according to the second embodiment to which the present invention is applied. The mobile terminal device 300 first connects to the access point 100 and recognizes the BSSID of the access point 100 (step S300). Next, the mobile terminal device 300 recognizes the selected communication channel of the access point 100 (step S302). Next, the mobile terminal device 300 determines whether or not the automatic setting operation of the optimum channel has been accepted (step S304). The mobile terminal device 300 displays, for example, an operation screen for accepting the automatic setting operation of the optimum channel, and determines whether or not the automatic setting operation of the optimum channel is accepted based on the operation for the operation screen.

When the mobile terminal device 300 does not accept the automatic setting operation of the optimum channel (step S304: NO), the process of this flowchart ends. When the mobile terminal device 300 receives the automatic setting operation of the optimum channel (step S304: YES), the mobile terminal device 300 performs scanning in the vicinity of the mobile terminal device 300 (step S306). The mobile terminal device 300 records the scan result in step S306 as a scan result in an internal memory (not shown) (step S308). The mobile terminal device 300 determines the optimum communication channel based on the scan result (step S310).

Next, the mobile terminal device 300 determines whether or not the optimum communication channel determined in step S310 and the communication channel selected by the access point 100 recognized in step S302 are different (step S312). When the two communication channels are not different (step S312: NO), the mobile terminal device 300 ends the process of this flowchart. When the two communication channels are different (step S312: YES), the mobile terminal device 300 requests the access point 100 to change the communication channel (step S314).

As described above, according to the mobile terminal device 300 of the second embodiment, the radio wave emitted from the access point from the access point 100 is detected according to the operation of the user, and the location of the mobile terminal device 300 is set to the second. Optimal communication in both the first place and the second place based on the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place. You can select the channel. As a result, according to the mobile terminal device 300, the communication channel at the user's position can be changed to the optimum communication channel.

(Selection process of optimal communication channel)
Hereinafter, in the first embodiment and the second embodiment described above, the process of selecting the optimum communication channel in both the first location and the second location will be described in detail.
For example, the mobile terminal device 300 calculates the level of the interference wave in each communication channel based on the scan results of both the first scan result and the second scan result in consideration of the degree of adjacency of the adjacent channels. Based on the calculated interference level of each communication channel, the optimum communication channel is selected in both the first place and the second place.

FIG. 11 shows (a) an example of scan results, (b) an example of an interference wave radio field intensity list by channel, (c) an example of an interference wave RSSI list by channel, and (d) by channel considering adjacent channels. It is a figure which shows an example of the interference wave RSSI list.

The mobile terminal device 300 obtains the scan result shown in FIG. 11A by scanning the communication channel. The scan result of FIG. 11A omits the ESID.

Next, the mobile terminal device 300 extracts the radio field strength of another access point that is an interference source of each communication channel based on the scan result of FIG. 11A. The extraction result is, for example, a list of interference wave radio field intensities for each channel shown in FIG. 11B. The interference wave radio field intensity list for each channel is, for example, information in which the communication channel number and the radio wave strength of the interference wave are associated with each other. In the mobile terminal device 300, for example, when a plurality of interference waves (-65 [dBm], -32 [dBm]) having the same communication channel number (for example, "1") are detected, the radio wave intensity having the highest value (for example, "1") is detected. −32 [dBm]) is extracted. The mobile terminal device 300 creates a list of interference wave radio field intensities by channel by excluding the access point 100 to which it connects by default.

Next, the mobile terminal device 300 calculates RSSI (Received Signal Strength Indication, Received Signal Strength Indicator) for each communication channel, and creates a channel-specific interference wave RSSI list shown in FIG. 11 (c). RSSI is not an absolute value such as radio field strength [dBm], but a relative index, and the calculation formula from radio field strength to RSSI differs depending on the wireless chip manufacturer. The mobile terminal device 300 of the present embodiment calculates RSSI by adding a predetermined value (for example, 127) to the radio wave intensity, but the present invention is not limited to this. The channel-specific interference wave RSSI list is, for example, information in which the communication channel number and the interference wave RSSI are associated with each other. The mobile terminal device 300 sets the RSSI value of the communication channel that cannot be detected by other access points to "0".

Next, in the mobile terminal device 300, for each communication channel to be evaluated, the RSSI of the communication channel to be evaluated, the RSSI of a plurality of non-evaluation communication channels adjacent to the communication channel to be evaluated, and the RSSI of a plurality of non-evaluation target communication channels are not evaluated. The RSSI of the interference wave considering the adjacent channel is calculated based on the weighting coefficient for each communication channel. The weighting coefficient is a value that becomes smaller as the communication channel not evaluated is farther from the communication channel to be evaluated. The number of communication channels not evaluated is, for example, 4, 5, 6, 7, or 8. For example, when the communication channel to be evaluated is "5ch", the mobile terminal device 300 selects "1ch, 2ch, 3ch, 4ch, 6ch, 7ch, 8ch, 9ch" as the communication channel not to be evaluated. In the mobile terminal device 300, the weighting coefficient of 1ch is 0.2, the weighting coefficient of 2ch is 0.4, the weighting coefficient of 3ch is 0.6, the weighting coefficient of 4ch is 0.8, and the weighting coefficient of 6ch is 0.8. , The weighting coefficient of 7ch is set to 0.6, the weighting coefficient of 8ch is set to 0.4, and the weighting coefficient of 9ch is set to 0.2. As a result, the mobile terminal device 300 corresponds to 5 channels in the interference wave RSSI list for each channel shown in FIG. 11 (d) with the RSSI having the highest multiplication value of the RSSI and the weighting coefficient by performing the calculation of the following formula. Attach and store.
RSSI = MAX (1ch RSSI x 0.2, 2ch RSSI x 0.4, 3ch RSSI x 0.6, 4ch RSSI * 0.8, 5ch RSSI)
The mobile terminal device 300 performs calculations using RSSI and weighting factors for all communication channels, and creates an interference wave RSSI list for each channel shown in FIG. 11D. The mobile terminal device 300 selects the communication channel having the smallest RSSI among the RSSIs of the interference waves included in the channel-specific interference wave RSSI list of FIG. 11D. The mobile terminal device 300 selects, for example, 4ch.

FIG. 12 shows, in an embodiment, (a) a channel-specific interference wave RSSI list at a first location considered for adjacent channels, (b) a channel-specific interference wave RSSI list at a second location considered adjacent channels, and ( c) It is a figure which shows the average RSSI list of the interference wave by channel.
For example, the mobile terminal device 300 creates an interference wave RSSI list considering the adjacent channels as shown in FIG. 12 (a) based on the scan result of the first location, and the adjacent channels shown in FIG. 12 (b). Create an interference wave RSSI list considering the above based on the scan result of the second place. The mobile terminal device 300 includes the RSSI of the interference wave included in the channel-specific interference wave RSSI list of the first place and the interference wave RSSI of the interference wave included in the channel-specific interference wave RSSI list of the second place for each communication channel. Calculate the average value of. As shown in FIG. 12 (c), the mobile terminal device 300 creates an average RSSI list of interference waves in which the numbers of each communication channel are associated with the average value of RSSI of the interference waves of each communication channel.

The mobile terminal device 300 selects 6 channels as the communication channel of the smallest RSSI among the average RSSI included in the average RSSI list of the interference waves for each channel.

As described above, the mobile terminal device 300 can select the optimum communication channel in both the first place and the second place. That is, among the RSSIs of the interference waves included in the channel-specific interference wave RSSI list of the first place, the communication channel of the smallest RSSI is 4ch, and the interference included in the channel-specific interference wave RSSI list of the second place. Among the wave RSSIs, the communication channel of the smallest RSSI is 9ch, but 6ch can be selected as the optimum communication channel in both the first place and the second place.

The mobile terminal device 300 uses the average value of the RSSI of the interference wave in order to select the optimum communication channel in both the first place and the second place, but the calculation is not limited to this. The result may be used to select the optimal communication channel.

The mobile terminal device 300 calculates the level of the interference wave of each communication channel based on the scan results of both the first scan result and the second scan result, and sets the calculated interference wave level of each communication channel. Based on this, the optimal communication channel may be selected in both the first location and the second location. This process differs from the process described with reference to FIG. 11 described above in that RSSI is not calculated and the degree of adjacency between the communication channel to be evaluated and the communication channel not to be evaluated is not taken into consideration.

FIG. 13 is a diagram showing (a) an example of scan results, (b) an example of an interference wave radio field intensity list by channel, and (c) an example of an interference wave radio wave intensity list by channel considering adjacent channels.

The mobile terminal device 300 extracts the radio field strength of another access point that is an interference source of each communication channel based on the scan result of FIG. 13A. The extraction result is, for example, a list of interference wave radio field intensities for each channel shown in FIG. 13 (b). The interference wave radio field intensity list for each channel is, for example, information in which the communication channel number and the radio wave strength of the interference wave are associated with each other. For example, when a plurality of interference waves having the same communication channel number are detected, the mobile terminal device 300 extracts the radio field intensity having the highest value. The mobile terminal device 300 creates a list of interference wave radio field intensities by channel by excluding the access point 100 to which it connects by default.

Next, in the mobile terminal device 300, for each communication channel to be evaluated, the radio wave intensity of the interference wave of the communication channel to be evaluated and the interference wave of a plurality of non-evaluation target communication channels adjacent to the communication channel to be evaluated are Based on the radio wave strength, the radio wave strength of the interference wave considering the adjacent channel is calculated. In the mobile terminal device 300, for example, the radio field intensity of the interference wave of the four communication channels having a smaller number than the communication channel not evaluated and the interference wave of the four communication channels having a larger number than the communication channel not evaluated. Based on the radio field strength, the radio wave strength of the interference wave considering the adjacent channel is calculated.

For example, when the communication channel not to be evaluated is 5 channels, the mobile terminal device 300 calculates the radio wave intensity of the highest interference wave by performing the calculation of the following formula to obtain the interference wave for each channel in FIG. 13 (c). It is stored in association with 5 channels in the radio field strength list.
Interference wave strength = MAX (1ch interference wave strength, 2ch interference wave strength, 3ch interference wave strength, 4ch interference wave strength, 5ch interference wave strength, 6ch Radio wave strength of interference wave, radio wave strength of 7ch interference wave, radio wave strength of 8ch interference wave)

The mobile terminal device 300 performs calculations using the radio wave intensities of the interference waves for all communication channels, and creates a list of interference wave radio wave intensities for each channel in FIG. 13 (c). The mobile terminal device 300 selects the communication channel having the lowest radio field strength among the radio wave intensities of the interference waves included in the channel-specific interference wave radio field strength list of FIG. 13 (c). The mobile terminal device 300 selects, for example, 6 to 11 channels. The mobile terminal device 300 may randomly select one communication channel from 6 to 11 channels.

The mobile terminal device 300 creates the interference wave radio field intensity list for each channel of FIG. 13 (c) at the first place, and creates the interference wave radio wave intensity list for each channel of FIG. 13 (c) at the second place. Then, the portable terminal device 300 includes the radio wave intensity of the interference wave included in the channel-specific interference wave radio wave intensity list of the first place and the radio wave strength of the interference wave included in the channel-specific interference wave radio wave strength list of the second place. And calculate the average value. The mobile terminal device 300 creates a list of average radio wave intensities of interference waves in which the numbers of each communication channel are associated with the average value of the radio wave intensities of the interference waves of each communication channel.

The mobile terminal device 300 selects the communication channel having the lowest radio field strength among the average radio field strengths included in the average radio field strength list of the interference waves for each channel. As described above, the mobile terminal device 300 can select the optimum communication channel in both the first place and the second place.

In the process described with reference to FIG. 13, the mobile terminal device 300 calculates RSSI from the radio wave intensity of the interference wave and creates an interference wave RSSI list for each channel without considering the degree of adjacency of the communication channel. May be done.

(Third Embodiment)
Hereinafter, the third embodiment will be described. The mobile terminal device 300 of the third embodiment is described above in that it generates map information based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. It is different from the mobile terminal device 300 of the embodiment. Hereinafter, the differences will be mainly described.

FIG. 14 is a diagram showing an example of map information between a position in a house and an optimum channel in a wireless communication system according to a third embodiment to which the present invention is applied. FIG. 14 (a) shows the map information of the optimum communication channel on the first floor of the house, FIG. 14 (b) shows the map information of the optimum communication channel on the second floor of the house, and FIG. 14 (c) shows the map information of the optimum communication channel of the house. The map information of the optimum communication channel on the 3rd floor is shown.

The mobile terminal device 300 acquires the scan result of each room by executing the scan of the communication channel while staying in each room of the house, for example. The mobile terminal device 300 determines the optimum communication channel for each room based on the scan result. The mobile terminal device 300 generates map information which is an image in which an image showing an optimum communication channel of each room is superimposed on a position in the image of each room included in the floor plan of the house. Further, the mobile terminal device 300 may superimpose an image representing the access point 100 on the position in the image in which the access point 100 is installed in the map information. As a result, the mobile terminal device 300 can present the map information as shown in FIG. 14 to the user.

The mobile terminal device 300 is not limited to the map information in the image format as shown in FIG. 14, but has a tabular format in which the character information indicating each room name and the character information indicating the optimum communication channel of each room are associated with each other. Map information may be generated.

According to the mobile terminal device 300, for each communication channel at each location in a predetermined space, based on at least the detection result of the first radio wave at the first location and the detection result of the second radio wave at the second location. It is possible to generate map information in which image information representing radio field strength is arranged. Thereby, the mobile terminal device 300 can indicate, for example, at which place in the house it is preferable to install the access point 100.

FIG. 13 is a diagram showing an example of map information of a position in a house and superiority or inferiority of an interference situation in a wireless communication system according to a third embodiment to which the present invention is applied. FIG. 15A shows the map information of the interference situation on the first floor of the house, FIG. 15B shows the map information of the interference situation on the second floor of the house, and FIG. 15C shows the interference situation on the third floor of the house. Shows map information of the situation.

The mobile terminal device 300 acquires the scan result of each room by executing the scan of the communication channel while staying in each room of the house, for example. The mobile terminal device 300 detects not only radio waves emitted from the access point 100 at home but also radio waves emitted from, for example, an access point installed in a neighboring house. The mobile terminal device 300 determines the interference status of each room based on the scan result. The mobile terminal device 300 determines that the stronger the radio wave intensity emitted from the access point installed in the neighboring house, the stronger the interference situation.

The mobile terminal device 300 generates map information which is an image in which an image showing an interference situation of each room is superimposed on a position in the image of each room included in the floor plan of the house. Further, the mobile terminal device 300 may superimpose an image representing the access point 100 on the position in the image in which the access point 100 is installed in the map information. As a result, the mobile terminal device 300 can present the map information as shown in FIG. 15 to the user.

The mobile terminal device 300 is not limited to the map information in the image format as shown in FIG. 15, but the map information in the tabular format in which the character information indicating each room name and the character information indicating the interference status of each room are associated with each other. May be generated. Further, the mobile terminal device 300 may present the interference situation in color instead of presenting it in characters. The mobile terminal device 300 may superimpose an image of the emphasized color on the floor plan image, for example, in a place where the interference situation is stronger.

According to the mobile terminal device 300, an image showing the superiority or inferiority of the interference situation in a predetermined space based on the detection result of the first radio wave in at least the first place and the detection result of the second radio wave in the second place. It is possible to generate map information in which information is arranged. Thereby, the mobile terminal device 300 can indicate, for example, at which place in the house it is preferable to install the access point 100.

(Modification example)
In the above-described embodiment, the mobile terminal device 300 executes a scan and executes a predetermined process based on the scan result, but the present invention is not limited to this, and a mobile device executes the scan and determines the predetermined process based on the scan result. You may execute the processing of. For example, a mobile cleaning robot that automatically moves and cleans the inside of a house may cause a mobile device to perform a scan and perform a predetermined process based on the scan result. In this case, the predetermined process may be a process of transmitting the scan result to the device operated by the user or a process of transmitting the result of the predetermined process described above to the device operated by the user.

Although each embodiment and modification have been described, the present invention is not limited to these, and is not limited to these. For example, any one of each embodiment or each modification, a part of each embodiment, or one of the modifications. The unit may be combined with another one or more embodiments or other one or more modifications to realize one aspect of the invention.

A program for executing each process of the mobile terminal device 300 in the present embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read and executed by the computer system. Therefore, the above-mentioned various processes related to the mobile terminal device 300 may be performed.

The "computer system" here may include hardware such as an OS and peripheral devices. In addition, the "computer system" includes a homepage providing environment (or display environment) if a WWW system is used. The "computer-readable recording medium" includes a flexible disk, a magneto-optical disk, a ROM, a writable non-volatile memory such as a flash memory, a portable medium such as a CD-ROM, and a hard disk built in a computer system. It refers to the storage device of.

Furthermore, the "computer-readable recording medium" is a volatile memory inside a computer system that serves as a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line (for example, DRAM (Dynamic)).
It also includes those that hold the program for a certain period of time, such as Random Access Memory)). Further, the program may be transmitted from a computer system in which this program is stored in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.

Here, the "transmission medium" for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. Further, the above program may be for realizing a part of the above-mentioned functions. Further, a so-called difference file (difference program) may be used, which can realize the above-mentioned functions in combination with a program already recorded in the computer system.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the design within a range not deviating from the gist of the present invention is also included.

100 Access points 102, 202, 302 Wireless communication unit 104, 204, 304 Signal detection unit 106 Channel selection unit 108, 206 Communication control unit 200 Home appliances 208 Application processing unit 300 Mobile terminal device 306 Processing unit 308 Interface unit

Claims (9)

A detector that detects radio waves emitted from an access point at a first location and a second location different from the first location.
A processing unit that performs a predetermined process based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place.
Information processing device equipped with. The predetermined process of the first place and the second place based on the comparison between the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. It is a process to display the optimum communication channel on both sides.
The information processing device according to claim 1. The predetermined process prompts the change of the communication channel selected by the access point based on the comparison between the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. Processing,
The information processing device according to claim 1. It also has an operation unit that accepts user operations.
The second location is a location farther from the access point than the first location.
The predetermined process of the first place and the second place is based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place. The optimum communication channel was selected in both the first place and the second place based on the process of prompting the selection of the optimum communication channel in both places and the operation of the user received by the operation unit. In some cases, including a process of requesting the access point to change the communication channel.
The information processing device according to claim 1. It also has an operation unit that accepts user operations.
The detection unit detects radio waves emitted from the access point in response to a user operation received by the operation unit.
The processing unit uses the location of its own device as the second location, and based on the detection result of the first radio wave at the first location and the detection result of the second radio wave at the second location. Select the optimal communication channel in both the first location and the second location.
The information processing device according to claim 1. Based on at least the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place, the processing unit performs each communication channel in each place in a predetermined space. Generates map information with image information representing the radio field strength of
The information processing device according to claim 1. Based on at least the detection result of the first radio wave in the first place and the detection result of the second radio wave in the second place, the processing unit sets each communication channel in a predetermined space. Generates map information in which image information indicating the superiority or inferiority of radio wave interference is generated.
The information processing device according to claim 1. Detects radio waves emitted from the access point at the first location and
A radio wave emitted from the access point is detected at a second location different from the first location, and the radio wave is detected.
A predetermined process is performed based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place.
Radio wave condition detection method. An information processing device program
In the information processing device
The radio wave emitted from the access point is detected at the first place,
A radio wave emitted from the access point is detected at a second location different from the first location.
A predetermined process is performed based on the detection result of the first radio wave at the first place and the detection result of the second radio wave at the second place.
program.

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