JP2009284423A - Access point, and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which allows to determine whether electromagnetic wave is generated from an AP or not easily. <P>SOLUTION: In the AP 110, information for identifying another AP 110 to be monitored is stored, signals sent from the another AP 110 is monitored, and it is determined that the another AP 110 is failed when a count of reception failure of the signals sent from the another AP 110 exceeds a predetermined count. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for performing communication via radio.

  As one of communication networks, wireless LAN (Local Area Network) technology is used. In the wireless LAN technology, a wireless relay device called an access point (hereinafter referred to as AP) transmits and receives information wirelessly with a wireless terminal.

  And about the state of the electromagnetic waves output from AP, the presence or absence of the output of electromagnetic waves, the intensity | strength of electromagnetic waves, etc. are measured by using the apparatus for exclusive use which measures electromagnetic waves (for example, wireless communication apparatus of patent document 1). Has been identified.

JP 2007-27932 A

  When measuring electromagnetic waves using a dedicated device such as the wireless communication device described in Patent Document 1, if there is no output of electromagnetic waves from the AP due to an AP failure or the like, the presence or absence of failure It took time and time to identify the faulty AP and the faulty AP.

  Then, an object of this invention is to provide the technique which can grasp | ascertain easily whether the electromagnetic waves are output from AP.

  In order to solve the above problems, the present invention monitors a signal transmitted from another AP in the AP.

  For example, the present invention is an access point that includes a storage unit that stores information for specifying other access points to be monitored, and a control unit, and the control unit switches wireless communication channels. The process of receiving a signal transmitted from another access point and the number of times the signal transmitted from the other access point could not be received exceed a predetermined number And a process of generating information for identifying other access points whose number of times of reception of the access point exceeds a predetermined number of times.

  As described above, according to the present invention, it is possible to provide a technique capable of easily grasping whether or not an electromagnetic wave is output from an AP.

  FIG. 1 is a schematic diagram of a communication system 100 according to an embodiment of the present invention.

  As illustrated, the communication system 100 includes an AP 110 and a management device 130. The AP 110 and the management apparatus 130 can transmit and receive information to and from each other via the LAN 152, and can be connected to a WAN (Wide Area Network) 153 via the router 150. Yes. In addition, the AP 110 can transmit and receive information to and from the communication terminal 150 via wireless.

  FIG. 2 is a schematic diagram of the AP 110.

  As illustrated, the AP 110 includes a wireless communication unit 111, a control unit 112, a storage unit 117, and a wired communication unit 122.

  The wireless communication unit 111 processes a wireless signal that is transmitted and received via the antenna 123.

  Specifically, RF (Radio Frequency) processing that performs modulation and demodulation processing of radio signals that are transmitted and received via the antenna 123, baseband signal processing that performs modulation and demodulation of baseband signals, and upper data link of the physical layer The layer performs MAC processing according to a MAC (Media Access Control) protocol that defines a frame transmission / reception method, frame format, error detection method, and the like.

  In particular, in the present embodiment, the wireless communication unit 111 changes a wireless channel and receives a signal from another AP (in this embodiment, a beacon signal) according to an instruction from the monitoring unit 115 described later. The necessary information is output to the monitoring unit 115.

  The control unit 112 includes an overall control unit 113, a communication processing unit 114, and a monitoring unit 115.

  The overall control unit 113 controls the overall processing of the AP 110. In particular, in the present embodiment, when the AP 110 is turned on or reset, processing for confirming the normality of the control unit 112 and the storage unit 117 is performed.

  The communication processing unit 114 controls communication processing in the AP 110.

  The monitoring unit 115 acquires and monitors the communication status of other APs 110.

  For example, in the present embodiment, the monitoring unit 115 receives a signal (for example, a beacon signal) transmitted from another AP 110, extracts necessary information, and stores the information in a registration information table 118a described later. .

  Further, the monitoring unit 115 receives a signal (for example, a beacon signal) transmitted by the AP 110 registered in the monitoring list table 119a at a predetermined timing, acquires predetermined detection information, and performs monitoring described later. Processing to store in the list table 119a is performed.

  When the number of times the AP 110 registered in the monitoring list table 119a cannot receive a signal (for example, a beacon signal) exceeds a predetermined number, the monitoring unit 115 has a predetermined format. A process for generating failure information is performed.

  Further, the monitoring unit 115 performs processing for storing the monitoring list table 119 a transmitted from the management device 130 in the monitoring list storage area 119.

  The storage unit 117 includes a registration information storage area 118, a monitoring list storage area 119, and a failure information storage area 120.

  The registration information storage area 118 stores information that identifies other APs 110 that can receive radio waves at the own AP 110.

  For example, in the present embodiment, a registration information table 118 a as shown in FIG. 3 (schematic diagram of the registration information table 118 a) is stored in the registration information storage area 118.

  As shown in the figure, the registration information table 118a has a BSSID column 118b, a channel column 118c, an SSID column 118d, and a reception level column 118e.

  The BSSID column 118b stores BSSIDs extracted from MAC frames in signals (for example, beacon signals) received from other APs 110.

  The channel column 118c stores information for specifying a channel number extracted from a signal (for example, a beacon signal) received from another AP 110.

  In the SSID column 118d, information specifying an ESS or IBSS identifier extracted from a signal (for example, a beacon signal) received from another AP 110 is stored.

  The reception level column 118 stores information that specifies the level of the reception voltage of a signal (for example, a beacon signal) received from another AP 110.

  Returning to FIG. 2, the monitoring list storage area 119 could not receive the information identifying the other AP 110 that monitors the electromagnetic wave transmission status in the monitoring unit 115 and the signal transmitted from the other AP 110. And information for specifying the number of times is stored.

  For example, in the present embodiment, a monitoring list table 119a as shown in FIG. 4 (schematic diagram of the monitoring list table 119a) is stored in the monitoring list storage area 119.

  As shown in the figure, the monitoring list table 119a includes a registration information area 119b, a detection information area 119c, and a monitoring information area 119d.

  The registration information area 119b has an item number column 119e, an AP name column 119f, a BSSID column 119g, a channel column 119h, and an SSID column 119i.

  The item number column 119e stores an item number (in this case, a serial number based on a natural number) that is identification information for uniquely identifying the AP 110 to be monitored in the monitoring list table 119a.

  The AP name column 119f stores an AP name that is the name of the AP 110 that performs monitoring in the monitoring list table 119a.

  The BSSID column 119g stores information for specifying the BSSID used by the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The channel column 119h stores information for specifying a channel used by the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The SSID column 119i stores information for identifying an ESS or IBSS identifier used by the AP 110 identified by at least one of the item number column 119e and the AP name column 119f.

  Note that the information stored in the registration information area 119b is stored in advance before monitoring by the AP 110 is started.

  The detection information column 119c includes a channel column 119j, an SSID column 119k, a wireless mode column 119l, an encryption scheme column 119m, a beacon period column 119n, a reception level column 119o, and a last detection date / time column 119p.

  The channel column 119j stores information for specifying a channel number of a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The SSID column 119k stores information for specifying an ESS or IBSS identifier of a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The wireless mode column 119l stores information for specifying the wireless mode of a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The encryption method column 119m stores information for specifying the encryption method of a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The beacon period column 119n stores information for specifying the beacon period of the signal (here, beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The reception level column 119o stores information specifying the reception level of a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f.

  The last detection date / time column 119p stores information specifying the last detection date / time when a signal (here, a beacon signal) from the AP 110 specified by at least one of the item number column 119e and the AP name column 119f is detected. Is done.

  In the detection information area 119c, information extracted from the MAC frame of the beacon signal or the information element of the beacon signal is stored in the channel column 119j, the SSID column 119k, the wireless mode column 119l, the encryption method column 119m, and the beacon period column 119n. The reception level column 119o stores the reception level (reception strength) of the beacon signal measured by the wireless communication unit 111, and the monitoring unit 115 last receives the beacon signal in the final detection date column 119p. Stores information specifying date and time.

  The monitoring information area 119d has a reconfirmation count column 119q.

  The reconfirmation frequency column 119q includes information for identifying the number of times that a signal (here, a beacon signal) from the AP 110 identified by at least one of the item number column 119e and the AP name column 119f could not be received. Is stored.

  Returning to FIG. 2, in the failure information storage area 120, information (here, an AP name) that identifies an AP 110 in which the number of times that a signal (here, a beacon signal) could not be received exceeds a predetermined number of times. And BSSID) are stored.

  The wired communication unit 122 is an interface for transmitting and receiving information via a wired LAN.

  FIG. 5 is a schematic diagram of the management apparatus 130.

  As illustrated, the management apparatus 130 includes a storage unit 131, a control unit 136, an input unit 140, an output unit 141, and a communication unit 142.

  The storage unit 131 includes a management information storage area 132, a monitoring list storage area 133, and a failure information storage area 134.

  In the management information storage area 132, the management information table 118a transmitted from each AP 110 is stored in association with the transmitted AP 110.

  In the monitoring list storage area 133, a monitoring list table 119a for each AP 110 is stored in association with each AP 110.

  In the failure information storage area 134, failure information transmitted from each AP 110 is stored.

  The control unit 136 includes an overall control unit 137 and a management unit 138.

  The overall control unit 137 controls overall processing in the management apparatus 130.

  The management unit 138 controls processing for managing each AP 110.

  For example, the management unit 138 stores the management information table transmitted from each AP 110 in the management information storage area 132, and generates a management information output screen obtained by processing the stored management information table 118a into a predetermined display format. The generated management information output screen is output to the output unit 141.

  When the management unit 138 receives selection of the AP 110 to be monitored from the operator via the input unit 140 on the management information output screen output to the output unit 141, the management unit 138 specifies information and a channel for specifying the BSSID of the selected AP 110. And the information for identifying the ESS or IBSS identifier are extracted from the management information table 118a, stored in the registration information area 119b of the monitoring list table 119b, and an item number is assigned to each record. Are identified and stored in the item number column 119e and the AP name column 119f, respectively, thereby generating the monitoring list table 119a and storing the management information table 118a in the monitoring list storage area 133 in association with the AP 110 that has transmitted the management information table 118a. .

  When the management unit 138 receives an input of a transmission instruction specifying identification information for identifying the AP 110 from the operator via the input unit 140, the management unit 138 stores the AP 110 in association with the AP 110. The monitoring list table 119a is transmitted via the communication unit 142.

  Furthermore, the management unit 138 performs processing for storing the failure information transmitted from each AP 110 in the failure information storage area 134 in association with the transmitted AP 110.

  In addition, the management unit 138 generates a failure information output screen obtained by processing the failure information stored in the failure information storage area 134 into a predetermined display format, and outputs the generated management information output screen to the output unit 141. Process.

  The input unit 140 receives input of information.

  The output unit 141 outputs information.

  The communication unit 142 is an interface that transmits and receives information via the LAN 130.

  The management device 130 described above includes, for example, a CPU (Central Processing Unit), a memory, an external storage device such as an HDD (Hard Disk Drive), a CD-ROM (Compact Disk Read Only Memory), a DVD-ROM ( A reader that reads information from a portable storage medium such as Digital Versatile Disk (Read Only Memory), an input device such as a keyboard and mouse, an output device such as a display, and a NIC (Network Interface) for connection to a communication network Card) and other communication devices.

  For example, the storage unit 131 can be realized by the CPU using a memory or an external storage device, and the control unit 136 loads a predetermined program stored in the external storage device into the memory and executes it by the CPU. The input unit 140 can be realized by the CPU using the input device, the output unit 141 can be realized by the CPU using the output device, and the communication unit 142 This can be realized by the CPU using the communication device.

  The predetermined program may be downloaded from the storage medium via the reading device or from the network via the communication device to the external storage device, and then loaded onto the memory and executed by the CPU. . Alternatively, the program may be directly loaded onto a memory from a storage medium via a reading device or from a network via a communication device and executed by a CPU.

  FIG. 6 is a flowchart showing the self-diagnosis process in the AP 110.

  First, when the AP 110 is turned on or reset (S10), the overall control unit 113 of the AP 110 performs initial setting of the communication processing unit 114 (S11).

  Next, the overall control unit 113 performs an initialization and write test of an area used as a work memory in the storage unit 117 (S12).

  Next, the overall control unit 113 checks whether there is an abnormality in the result of the writing test in step S12 (S13). If there is an abnormality, the process proceeds to step S14, and if there is no abnormality, the process proceeds to step S15. .

  In step S15, the overall control unit 113 checks the normality of the area used as the program memory in the storage unit 117.

  Then, the overall control unit 113 checks whether there is an abnormality in the normality confirmation in step S15 (S16). If there is an abnormality, the process proceeds to step S14, and if there is no abnormality, the process ends. The communication process is started.

  On the other hand, in step S14, the overall control unit 113 performs error processing. For example, the overall control unit 113 performs processing for transmitting information specifying that an error has occurred in the AP 110 to the management apparatus 130 via the wired communication unit 122.

  FIG. 7 is a flowchart illustrating processing in which the AP 110 acquires the communication status of another AP 110.

  First, the monitoring unit 115 of the AP 110 determines a processing time so as not to overlap with the processing in the other AP 110 (S20). For example, the monitoring unit 115 generates or acquires a random number, and sets the processing time when the time corresponding to the random number has elapsed.

  Then, the monitoring unit 115 checks whether or not the processing time determined in step S21 has been reached (S21). If the processing time has been reached (Yes in step S21), the processing in the communication processing unit 114 is stopped. (S22).

  Next, the monitoring unit 115 controls the wireless communication unit 111 to select one channel that has not yet been processed in step S24, and changes the communication channel of the wireless communication unit 111 to the selected channel (S23). .

  Next, the monitoring unit 115 detects the AP 110 based on whether or not the beacon signal from the AP 110 can be received on the channel changed in step S23 via the wireless communication unit 111 (S24).

  In step S24, when the beacon signal from the AP 110 can be received in the channel changed in step S23 (Yes in S25), the monitoring unit 115 proceeds to step S26. No in S25), the process proceeds to step S27.

  In step S26, the monitoring unit 115 specifies the BSSID stored in the MAC frame, the information specifying the channel number that is the information element of the beacon signal, the ESS or IBSS identifier from the beacon signal detected in step S24. The information and the information specifying the received voltage level of the beacon signal are acquired from the wireless communication unit 111, a new record is created in the registration information table 118a, and stored in the corresponding column of the record ( S26).

  Then, the monitoring unit 115 confirms whether or not the detection process of step S24 has been performed on all the channels that can be detected by the AP 110 (S27). If the detection process has been performed on all channels (Yes in S27). ), The process proceeds to step S28, and if the detection process is not performed for all channels (No in S27), the process returns to step S23 and the process is repeated.

  In step S <b> 28, the monitoring unit 115 transmits the registration information table 118 a stored in the registration information storage area 118 to the management apparatus 130 via the communication processing unit 114 and the wired communication unit 122.

  Then, the monitoring unit 115 controls the wireless communication unit 111 to return the communication channel in the wireless communication unit 111 to the communication channel of the own AP 110, and resumes the communication process (S29).

  Note that the processing shown in FIG. 7 may be performed, for example, after the processing in FIG. 6 is completed, may be performed in accordance with an instruction from the management device 130 or the communication terminal 150, and is further input to the AP 110. This may be performed when an instruction input is received via a provided input unit (not shown).

  FIG. 8 is a flowchart showing processing in which the AP 110 monitors the communication status of other APs 110.

  First, the monitoring unit 115 of the AP 110 creates a target list that is a list of APs 110 to be monitored when the monitoring time predetermined for the AP 110 is reached (Yes in S30) (S31).

  The target list is a list of all APs 110 specified by the information stored in the item number column 119e, AP name column 119f, and BSSID column 119g of the monitoring list table 119a stored in the monitoring list storage area 119 (these items are listed below). It is created by listing information).

  Next, the monitoring unit 115 determines a processing time so as not to overlap with processing in other APs 110 (S32). For example, the monitoring unit 115 generates or acquires a random number, and sets the processing time when the time corresponding to the random number has elapsed.

  Then, the monitoring unit 115 confirms whether or not the processing time determined in step S32 has been reached (S33). If the processing time has come (Yes in step S33), the monitoring unit 115 performs communication via the own AP 110. The communication processing unit 114 confirms whether there is a communication terminal 150 (S34).

  The monitoring unit 115 proceeds to step S35 if there is no communication terminal 150 performing communication via the own AP 110 (No in S34), and returns to step S30 if there is (Yes in S34). And wait until the next monitoring time is reached.

  In step S <b> 35, the monitoring unit 115 instructs the communication processing unit 114 to stop the processing in the communication processing unit 114.

  Next, the monitoring unit 115 controls the wireless communication unit 111 to select one channel that has not yet been processed in step S37, and changes the communication channel of the wireless communication unit 111 to the selected channel (S36). .

  Then, the monitoring unit 115 detects another AP 110 depending on whether or not the beacon signal from the AP 110 can be received through the wireless communication unit 111 in the channel changed in step S36 (S37).

  When the monitoring unit 115 can receive the beacon signal from the AP 110 in the channel changed in step S36 (Yes in S38), the monitoring unit 115 proceeds to step S39, and when the beacon signal cannot be received (No in S38). The process proceeds to step S41.

  In step S39, the monitoring unit 115 extracts the ESSID from the MAC frame of the beacon signal detected in step S37, and checks whether the AP 110 corresponding to the extracted ESSID is included in the target list.

  If the AP 110 corresponding to the extracted ESSID is included in the target list (Yes in S39), the monitoring unit 115 proceeds to step S40, and if not included (No in S39), the monitoring unit 115 proceeds to step S40. Proceed to S41.

  In step S40, the monitoring unit 115 specifies information identifying the channel number, information identifying the ESS or IBSS identifier, information identifying the wireless mode, and encryption method from the information element of the beacon signal detected in step S37. The information identifying the beacon period and the information identifying the received voltage level of the beacon signal are acquired from the wireless communication unit 111 and stored in the corresponding column of the detection information area 119c of the monitoring list table 119. To do.

  In step S41, the monitoring unit 115 confirms whether or not the detection process of step S37 has been performed on all the channels that can be detected by the AP 110, and if the detection process is performed on all channels (in step S41). Yes), the process proceeds to step S42, and if the detection process is not performed for all channels (No in S41), the process returns to step S36 and the process is repeated.

  Next, in the monitoring list table 119a, the monitoring unit 115 sets the reconfirmation frequency column 119q of the monitoring information area 119d of the record in which the channel in which the beacon signal can be received is stored in the registration information area 119b to “0”. “1” is incremented in the reconfirmation count column 119q of the monitoring information area 119d of the record stored in the registration information area 119b for the channel that is cleared and the beacon signal cannot be received (S42).

  Then, the monitoring unit 115 confirms the value stored in the reconfirmation number column 119q of the monitoring list table 119a, and confirms whether there is a record in which the value exceeds the predetermined number of times ( S43).

  If there is such a record (Yes in S43), the process proceeds to Step S44, and if there is no such record (No in S43), the process proceeds to Step S45.

  In step S44, the monitoring unit 115 performs failure processing assuming that there is a failure in the AP 110 being monitored. For example, the monitoring unit 115 acquires the information stored in the registration information area 119b of the record in which the value stored in the reconfirmation number column 119q of the monitoring list table 119a exceeds the predetermined number of times. The information is stored in the failure information storage area 120 as failure information for identifying the AP 110 in which the failure has occurred, and is transmitted to the management device 130 via the wired communication unit 110.

  In step S45, the monitoring unit 115 controls the wireless communication unit 111 to return the communication channel in the wireless communication unit 111 to the communication channel of the own AP 110, and resumes the communication process.

  Next, the monitoring unit 115 confirms the value stored in the reconfirmation frequency column 119q of the monitoring list table 119a, and confirms whether there is a record with the value “1” or more (S43).

  If there is no such record (No in S43), the monitoring unit 115 ends the process. If there is such a record (Yes in S43), the monitoring unit 115 proceeds to Step S47. .

  In step S47, the AP 110 corresponding to the record whose value stored in the reconfirmation count column 119q of the monitoring list table 119a is “1” or more is left in the target list, and the information corresponding to the other APs 110 is retrieved from the target list. delete.

  And the monitoring part 115 confirms in the communication processing part 114 whether there exists the communication terminal 150 which is communicating via self AP110 (S48).

  The monitoring unit 115 proceeds to step S49 when there is no communication terminal 150 performing communication via the own AP 110 (No at S48), and returns to step S30 when there is (Yes at S48). And wait until the next monitoring time is reached.

  In step S49, the monitoring unit 115 confirms whether or not the end time predetermined for the AP 110 has been reached. If the end time has been reached (Yes in S49), the monitoring unit 115 returns to step S30 to perform the next monitoring. Wait until the time is reached, and if it is not the end time (No in S49), return to Step S35 and repeat the process.

  As described above, in this embodiment, by detecting a beacon signal transmitted from another AP 110 to be monitored in the AP 110, when a beacon signal is not transmitted from the other AP 110 to be monitored, It can be determined that the other AP 110 has failed.

  Note that the processing shown in FIG. 8 is performed when the monitoring time comes as shown in step S30, but is not limited to such a mode, for example, according to an instruction from the management device 130 or the communication terminal 150 Further, it may be performed when an input unit (not shown) is provided in the AP 110 and an instruction input is received through the provided input unit. As described above, when the processing shown in FIG. 8 is performed in accordance with the instruction from the management device 130 or the communication terminal 150 and the instruction at the input unit of the AP 110, the processing time is determined in step S32 and step S33. It is also possible to perform processing without performing progress processing.

  In addition, in step S34 and step S48 in FIG. 8, when there is a communication terminal 150 that performs communication via the own AP 110, the process waits until the next monitoring time. It is not limited to. For example, when there is a communication terminal 150 that performs communication via its own AP 110, the monitoring unit 115 generates or acquires a random number again, and after the time corresponding to the random number has passed, If it is detected whether or not there is, the process from step S35 or step S49 may be performed.

  Furthermore, in step S49 of FIG. 8, when a predetermined end time has passed, the process waits until the next monitoring time, but is not limited to such a mode. For example, even when a predetermined end time has passed, the value stored in the reconfirmation number field 119q of the monitoring list table 119a is confirmed, and the value is set to a predetermined number of times (for example, the threshold value in step 43). If there are more records (such as those obtained by subtracting “1” from the number of times), the processing may be repeated by returning to step S35.

  In the embodiment described above, the management information table 118a generated by each AP 110 is transmitted to the management apparatus 130, and the monitoring list table 119a is generated in the management apparatus 130. The monitoring list table is not limited, for example, by storing information corresponding to the AP 110 whose reception level stored in the management information table 118a exceeds a predetermined value in a corresponding column of the monitoring list table 119a. It is also possible to generate 119a at each AP 110.

  Further, in the embodiment described above, the monitoring unit 115 of the AP 110 transmits the generated failure information to the management apparatus 130, but the present invention is not limited to such a mode. For example, an output unit (not shown) may be provided in the AP 110 so that failure information is output from the output unit in a predetermined format. Also, after an instruction from the management device 130 is received, the management device 130 It is also possible to transmit failure information to

  Furthermore, in the embodiment described above, in step S36 of FIG. 8, the channel is selected one by one from all the channels with which the own AP 110 can communicate, and the communication channel is changed to the selected channel. However, the present invention is not limited to such a mode. For example, it is possible to select one channel at a time from the channels stored in the channel column 119h of the monitoring list table 119a.

1 is a schematic diagram of a communication system. Schematic of AP. Schematic of a registration information table. Schematic diagram of a monitoring list table. Schematic diagram of the management device. The flowchart which shows the self-diagnosis process in AP. The flowchart which shows the process which AP acquires the communication condition of other AP. The flowchart which shows the process in which AP monitors the communication condition of other AP.

Explanation of symbols

100 communication system 110 AP
111 wireless communication unit 112 control unit 113 overall control unit 114 communication processing unit 115 monitoring unit 117 storage unit 118 registration information storage region 119 monitoring list storage region 120 failure information storage region 122 wired communication unit 130 management device 131 storage unit 132 management information storage Area 133 Monitoring list storage area 134 Failure information storage area 136 Control unit 137 Overall control unit 138 Management unit

Claims (7)

A storage unit that stores information for specifying other access points to be monitored, and a control unit, an access point comprising:
The controller is
By switching the wireless communication channel, a process of receiving a signal transmitted from another access point;
If the number of times a signal transmitted from the other access point cannot be received exceeds a predetermined number of times, the number of times the signal cannot be received is determined as a predetermined number of times. Generating information for identifying other access points that have been exceeded,
An access point characterized by The access point according to claim 1,
The controller is
Performing a process of receiving a signal transmitted from another access point by switching a wireless communication channel after elapse of a predetermined monitoring time;
An access point characterized by The access point according to claim 2,
The controller is
Performing a process of receiving a signal transmitted from another access point by switching a wireless communication channel when a randomly selected time has elapsed from a predetermined monitoring time;
An access point characterized by The access point according to any one of claims 1 to 3,
The controller is
Transmitting information identifying other access points whose number of times the signal could not be received exceeds a predetermined number of times to a predetermined terminal;
An access point characterized by The access point according to any one of claims 1 to 4,
The controller is
Receiving signals transmitted from other access points in all channels except the communication channel set in the own access point from the channels that can be set in the own access point;
An access point characterized by The access point according to any one of claims 1 to 4,
The controller is
By switching the wireless communication channel, a process of receiving a signal transmitted from another access point;
From the received signal, a process of acquiring information identifying other access points that transmitted the signal;
All other accesses obtained by receiving signals transmitted from other access points in all channels except the communication channels set in the own access point from the channels that can be set in the own access point Processing for identifying information for identifying points as information for identifying candidates for other access points to be monitored;
An access point characterized by A communication system comprising an access point and a management device that manages the access point,
The access point includes a storage unit that stores information for specifying other access points to be monitored, and a control unit.
By switching the wireless communication channel, a process of receiving a signal transmitted from another access point;
If the number of times a signal transmitted from the other access point cannot be received exceeds a predetermined number of times, the number of times the signal cannot be received is determined as a predetermined number of times. A process of generating information identifying other access points that have exceeded,
A process of transmitting information identifying the other access point to the management device;
To do the
A communication system characterized by the above.

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