JP2016058915A - Radio communication system, radio lan access point, server device, radio communication method and radio communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system that can continue communications based on WDS connection even when communication interruption occurs in a network through which access points are wirelessly connected to each other.SOLUTION: In a radio communication system having a server device for controlling/monitoring radio LAN access points, it is detected and notified to the server device that inter-access-point connection constructed by a WDS function is interrupted. The server device has control means for specifying a connection-interrupted channel when receiving a notification of the connection interruption, selecting a channel having the minimum frequency of the connection interruption out of channels which are channels other than the specified channel and have not been used for a predetermined time or more from the time of just-before connection interruption, and allocating the selected channel to all radio LAN access points constituting the connection-interrupted inter-access-point connection, thereby reconstructing the inter-access-point connection.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication system, a wireless LAN access point, a server device, a wireless communication method, and a wireless communication program used in a network that wirelessly connects wireless LAN access points.

  Conventionally, there is a system that quickly constructs a wireless access network by using a wide area sensor network as a control network and remotely controlling a wireless LAN access point (see, for example, Non-Patent Document 1). In such wireless LAN access point remote control technology, each home access point is remotely controlled via a wide-area ubiquitous network with a low transmission speed, so that various types of control are efficiently performed on a plurality of types of access points. There is a need. In order to realize this, a common command in which control commands for different access points depending on the model are shared, and a response to the command is simplified, and transmission through the control network is performed.

  Software for controlling the wireless LAN access point is installed in a control server and a service GW (gateway) installed in each home. Then, using common commands from various algorithms operating on the control server, complex access point control such as access point alive check, SSID (Service Set Identifier) setting, relay link setting between access points, radio channel assignment, etc. The wireless access network is constructed by sequentially implementing these.

  In this software, a common command is transmitted from the algorithm on the control server via common command processing, and the service GW refers to the database corresponding to the connection access point for the common command, and is suitable for the access point connected to the service GW. Convert to access point control command. In addition, the service GW extracts and transmits only the response data defined by the common command with respect to the acquired data from the access point.

Shimizu, Goto, Mizuno, Kumagaya, Yoshino, “Examination of wireless LAN access point remote control technology using wide area sensor network”, 2013 IEICE General Conference, B-5-150, March 19, 2013

  In order to construct the aforementioned wireless access network, connection between access points (WDS (Wireless Distribution System) connection) is performed, and W53 and W56 (for IEEE 802.11a channels, 5.3 GHz, 5.6 GHz) are used for this connection. It is also possible to use a band channel).

  However, when inter-access point connection (WDS connection) is performed using the channel, if a radar wave such as a weather observation radar is detected, the radio wave of the channel in which the radar wave is autonomously detected by the DFS (Dynamic Frequency Selection) function Since transmission is stopped, WDS connection disconnection occurs, and there is a problem that connection between access points cannot be continuously used. In the prior art, the connection status between the access points is monitored from the control server using the control network (for example, the WDS channel usage status is periodically acquired from the control server for the access point configuring the WDS connection, and the channel When the use is stopped, it is detected as a WDS connection disconnection), and after detecting the WDS connection disconnection, the WDS connection channel is newly allocated to the access point constituting the WDS connection. However, there is a problem that the WDS connection cannot be used continuously. Also, if WDS disconnection is monitored frequently, the amount of data transmitted to the control network increases, causing a control delay in the control network.

  The present invention has been made in view of such circumstances, and a wireless communication system and a wireless LAN access point capable of continuing communication by WDS connection even when communication disconnection occurs in a network in which access points are wirelessly connected An object of the present invention is to provide a server device, a wireless communication method, and a wireless communication program.

  The present invention provides a wireless communication system comprising a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system. The device detects and notifies that the connection between the access points configured by the WDS function is disconnected, and the server device receives the notification of the connection disconnection, and the channel that is disconnected Other than the specified channel, the channel that has not been used for a predetermined time or more from the time when the previous disconnection was selected is selected, and the channel with the least number of disconnections so far is selected and the connection is disconnected. Allocate the selected channel to all the wireless LAN access points constituting the connection between the access points It allows characterized in that it comprises a control means for reconstructing an inter access point connection.

  According to the present invention, the wireless LAN access point includes a connection disconnection detecting means for detecting that a connection between access points configured by the WDS function is disconnected, and the server when the connection disconnection is detected. And a notification means for notifying the apparatus that a disconnection has been detected.

  The present invention relates to connection disconnection detecting means for monitoring the use channel status of the connection between access points configured by the WDS function of the wireless LAN access point, and detecting disconnection when the use is stopped. And a notification means for notifying the server device that the disconnection has been detected when the disconnection is detected.

  The present invention provides a wireless LAN access in a wireless communication system comprising a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system. At the point, a disconnection detecting means for detecting that the connection between access points configured by the WDS function is disconnected, and when the disconnection is detected, a disconnection is detected for the server device. And a notifying means for notifying that it has been performed.

  The present invention provides the server device in a wireless communication system comprising a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system. When the disconnection notification is received, the channel that has been disconnected is identified, and channels other than the identified channel that have not been used for a predetermined time or more from the previous disconnection time. Of these, access is performed by selecting the channel with the smallest number of times of connection disconnection and assigning the selected channel to all the wireless LAN access points constituting the connection between the access points that have been disconnected. Control means for reconstructing the point-to-point connection is provided.

  The present invention provides a wireless communication performed by a wireless communication system including a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system. A method of detecting and notifying the server device that a connection between access points configured by the WDS function is disconnected; and a connection disconnection upon receiving the disconnection notification. Identifies the channel that has become disconnected, and selects the channel other than the specified channel that has not been used for a predetermined time or more from the previous disconnection time and has the minimum number of disconnections so far Selected channels for all the wireless LAN access points constituting the connection between the access points that are disconnected. By assigning, characterized by a control step for reconstructing the inter access point links.

  The present invention is a wireless communication program for causing a computer to function as the wireless LAN access point.

  The present invention is a wireless communication program for causing a computer to function as the server device.

  According to the present invention, it is possible to obtain an effect that communication by WDS connection can be continued even if communication disconnection occurs in a network that wirelessly connects access points.

It is a figure which shows the structure of one Embodiment of this invention. It is a block diagram which shows the structure of the control server 1 shown in FIG. It is a figure which shows the example of a network comprised based on the information memorize | stored in the NW information database 14 between APs. It is a flowchart which shows the processing operation of the control server 1 shown in FIG. It is a flowchart which shows the processing operation of the control server 1 shown in FIG. It is a figure which shows the structure of the Example using M2M wireless access for the control network.

  Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of the embodiment. In this figure, reference numeral 1 denotes a control server that controls connection between access points (APs), and is configured by a computer device. The control server 1 holds information on peripheral access points, and establishes a WDS link for connecting the access points by setting a WDS link and assigning a use channel for the link based on this information. .

  Reference numeral 2 denotes a control radio base station that is connected to the control server 1 and performs radio communication with an access point. Reference numeral 31 denotes a wireless LAN AP (hereinafter referred to as an access point) whose connection between access points is controlled by the control server 1.

  The access point 31 has a WDS connection function for establishing a WDS link with other access points. The WDS connection function is a function for wirelessly communicating between access points. According to the WDS connection function, devices that support WDS can communicate with each other wirelessly, and connect multiple access points to cover a wide area or reduce places where radio waves are difficult to reach. be able to.

  Furthermore, the access point 31 has a DFS function that the access point side changes the use frequency band so that the wireless LAN communication does not affect the weather radar or the like. Part of the frequency band (IEEE802.11a W53 / 56) used by the 5 GHz band wireless LAN overlaps with the frequency band used by various existing radars. For this reason, in the DFS function, an access point corresponding to this band constantly monitors and detects an interference wave such as a radar and switches the wireless LAN communication to another channel as soon as it is detected.

  Reference numeral 32 denotes a control terminal station that is connected to the service GW 33 and establishes a control link with the control radio base station 2. The service GW 33 is connected to the access point 31, converts the common command received via the control network into a control command suitable for the access point 31, and generates a common command response from the data acquired from the access point 31. Command processing device. Further, the service GW 33 detects WDS disconnection (for example, periodically acquires the WDS channel usage status and detects WDS disconnection when the channel usage is stopped), and transmits a WDS disconnection notification to the control server 1. .

  Reference numeral 41 denotes an access point whose connection between access points is controlled by the control server 1. Similar to the access point 31, the access point 41 has a WDS function and a DFS function. Reference numeral 42 denotes a control terminal station that is connected to the service GW 43 and establishes a control link with the control radio base station 2. The service GW 43 is connected to the access point 41, converts the common command received via the control network into a control command suitable for the access point 41, and generates a common command response from the data acquired from the access point 41. Command processing device. Further, the service GW 43 detects WDS disconnection and transmits a WDS disconnection notification to the control server 1.

  Reference numeral 51 denotes an access point whose connection between access points is controlled by the control server 1. Like the access point 31, the access point 51 has a WDS function and a DFS function. Reference numeral 52 denotes a control terminal station that is connected to the service GW 53 and establishes a control link with the control radio base station 2. The service GW 53 is connected to the access point 51, converts a common command received via the control network into a control command suitable for the access point 51, and generates a common command response from the data acquired from the access point 51. Command processing device. Further, the service GW 53 detects WDS disconnection and transmits a WDS disconnection notification to the control server 1.

  The three access points 31, 41, 51 are configured to be able to perform wireless communication with each other via a WDS link. In the example shown in FIG. 1, three access points 31, 41, 51 are shown, but four or more access points may be used. The access point 31 may have a WDS disconnection detection and WDS disconnection notification function (for example, notification to the service GW 33) for detecting that the WDS is disconnected.

  Next, the configuration of the control server 1 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of the control server 1 shown in FIG. In FIG. 2, reference numeral 11 denotes a control unit that controls the access points 31, 41, 51 by supervising the processing operation of the control server 1.

  Reference numeral 12 denotes a transmission / reception unit that performs communication with the access points 31, 41, 51 via the control wireless base station 2, the control terminals 32, 42, 52 and the service GWs 33, 43, 53. Reference numeral 13 denotes a WDS channel determination unit that determines a WDS channel for establishing a WDS link between the three access points 31, 41, 51.

  Reference numeral 14 denotes an inter-AP NW information database (DB) that stores network information between access points. Reference numeral 15 denotes a WDS available CH database (DB) that stores information of a WDS available channel (CH) for establishing a WDS link. Reference numeral 16 denotes a display device composed of a display device or the like. Reference numeral 17 denotes a peripheral AP information database (DB) that stores the peripheral access point, the channel used by the peripheral access point, and the RSSI value of this channel.

  Next, information stored in the inter-AP NW information database 14 shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a network configured based on information stored in the inter-AP NW information database 14.

  A specific example of data stored in the inter-AP NW information database 14 shown in FIG. 1 will be described. The inter-AP NW information is composed of “information identifier”, “information 1”, and “information 2”.

  When the information identifier is 0, information 1 is an ID of GW_AP (gateway access point), and information 2 is a WDS utilization channel. When the information identifier is 1, information 1 is an upstream access point ID, and information 2 is a downstream access point ID.

A specific example is shown.
When the inter-AP NW information is 0, 3, or 2, the gateway access point (GW_AP) ID is 3, and the WDS use channel is 2.

  Further, when 1, 3, 1, it indicates that the access point of ID1 is connected to the gateway access point (GW_AP).

  In the case of 1, 1, 2, it indicates that the access point of ID2 is connected to the access point of ID1.

  Also, 1, 1, 4 indicates that an ID4 access point is connected to an ID1 access point.

  Further, when 1, 4 and 5, it indicates that the access point of ID5 is connected to the access point of ID4.

  In the case of the inter-AP NW information, the WDS link configuration shown in FIG. 3 is obtained. That is, the access point with ID3 is the highest gateway access point, and the access point with ID1 is connected to this gateway access point. The access points of ID2 and ID4 are connected to this access focus. Furthermore, the access point of ID5 is connected to the access point of ID4. And this WDS use channel is 2.

  The control server 1 can manage the state of the WDS link by holding the inter-AP NW information in this way.

  Next, the processing operation of the control server 1 shown in FIG. 1 will be described with reference to FIGS. 4 and 5 are flowcharts showing the processing operation of the control server 1 shown in FIG. First, the service GWs 33, 43, 53 periodically monitor the WDS channel usage status of the access points 31, 41, 51. When the WDS disconnection is detected, the service GW 33, 43, 53 receives the control server via the control terminal stations 32, 42, 52. 1 is notified of WDS disconnection. Alternatively, when the WDS disconnection detection function detects the WDS disconnection during the WDS connection after establishing the WDS link, the access points 31, 41, 51 detect the service GWs 33, 43, 53 and the control terminal stations 32, 42, The WDS disconnection is notified to the control server 1 via 52.

  The transmission receiving unit 12 that has received this notification via the control radio base station 2 notifies the control unit 11 that the WDS disconnection notification has been received. The control unit 11 that has received the reception report of the WDS disconnection notification refers to the inter-AP NW information database 14 as inter-AP NW information to which the WDS disconnection access point belongs, as a gateway access point (GW-AP), configuration access point , WDS use channel is specified and transferred to the WDS channel determination unit 13 (step S1).

  Next, the WDS channel determination unit 13 disables the use of a WDS-disrupted CH (channel) for the WDS-available CH database 15 composed of channel availability / non-use, CH break count, and stop time. Then, the CH disconnection count of the channel is incremented, and the WDS disconnection reception time is stored as a stop time (step S2).

  Next, the WDS channel determination unit 13 updates the WDS available CH database 15 with the use of a CH that has passed a threshold time or more from the use suspension time (step S3).

  Next, the control unit 11 determines whether or not there is a WDS available channel in the WDS available CH database 15 (step S4).

  If there is no WDS available channel as a result of this determination, the control unit 11 displays on the display device 16 that there is no WDS channel. And the control part 11 produces | generates the command which deletes the WDS link of the said network between the access points, and transmits to the said access point. Further, a command for turning off the wireless setting (2.4 GHz, 5 GHz) of the network between the access points is generated and transmitted to the access point (step S5), and the process is terminated.

  On the other hand, if there is a WDS available channel, the WDS channel determination unit 13 determines the usage status of the WDS available CH around the gateway access point (GW-AP) in the inter-access point network via the control unit 11 and the peripheral AP information. It is acquired from the database 17 (database storing the usage channels of the peripheral AP and the peripheral access point and the RSSI value of this channel) (step S6).

  Then, the WDS channel determination unit 13 determines whether there is an unused channel (step S7).

  If there is an unused channel as a result of this determination, the WDS channel determination unit 13 determines the channel with the smallest channel disconnection counter as the WDS usage channel, and notifies the control unit 11 (step S8).

  In response to this, the control unit 11 generates and transmits a command for allocating a decision channel to all access points in the network between the access points, and reflects the result in the database (step S9). Exit.

  On the other hand, if there is no unused channel, the WDS channel determination unit 13 determines the channel with the smallest RSSI average value at the gateway access point (GW-AP) as the WDS usage channel, and notifies the control unit 11 of the channel. (Step S10), the process ends.

  As described above, the process for continuing the WDS connection activated by receiving the notification of the disconnection between access points (WDS disconnection) is implemented in the control server 1 on the network side. As a result, it is possible to identify the access point where the WDS is disconnected and the connection network between the access points, and determine the WDS available channel based on the WDS available channel and its usage status. By doing so, communication by WDS connection can be continued even if communication disconnection occurs in a network that wirelessly connects access points. In addition, in the method of the present invention, the WDS disconnection is detected by receiving the WDS disconnection notification as compared with the conventional method of periodically monitoring the WDS disconnection via the control network, so that the traffic amount accompanying the WDS disconnection detection is reduced. Is possible.

  Next, an embodiment of the above-described wireless communication system will be described with reference to FIG. FIG. 6 is a diagram showing a configuration of an embodiment in which M2M wireless access is used for the control network. In FIG. 6, reference numeral 1 is a control server equivalent to the control server 1 described above. Reference numeral 2 denotes an M2M base station corresponding to a control base station. Reference numerals 31, 41, 51, 61 are the above-described access points, and are provided with service GWs and M2M terminals corresponding to control terminal stations. Reference numeral 7 denotes a mobile ICT unit in which the control server 1 is mounted and a WDS connection gateway access point 61 for connecting the access points 31, 41, 51, 61 and a 25 GHz band FWA 71 are connected to an external network (NW). It is. Reference numeral 9 denotes a weather observation radar.

When the WDS connection is performed using the 5.6 GHz band (W56) outdoors, when the radar wave of the weather observation radar 9 is detected by the DFS function, the radio wave transmission of the channel in which the radar wave is detected is stopped and the WDS link is disconnected. Therefore, the WDS link recovery function is necessary. The WDS link recovery function is performed by the following procedures (1) to (3).
(1) The access points 31 to 61 or the service GW detects a radio wave transmission stop by the DFS function.
(2) Notify the control server 1 of WDS disconnection via the M2M wireless network.
(3) The control server 1 selects an appropriate channel, and instructs the access points 31 to 61 to make a WDS connection on the selected channel via the M2M wireless network.

  By this procedure, communication by WDS connection can be continued even if communication disconnection occurs in a network that wirelessly connects access points.

  As described above, in a wireless LAN mesh network system including a plurality of access points (APs) and a control server that controls the access points, a notification of “WDS disconnection” is sent when the connection between APs is disconnected. When the control server receives a “WDS disconnection” notification, it identifies the channel for which the WDS has been disconnected, and uses the specified channel for more than a specified time from the time when the previous WDS was disconnected other than the specified channel. Among the channels not selected, the channel with the smallest number of times the WDS has been disconnected is selected, and a command for assigning the selected channel is transmitted to all corresponding access points.

  According to this configuration, the WDS connection can be continuously used even under the DFS function.

  You may make it implement | achieve the control server 1 in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

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

  Even if communication disconnection occurs in a network in which access points are wirelessly connected, it can be applied to an application in which it is indispensable to continue communication by WDS connection.

  DESCRIPTION OF SYMBOLS 1 ... Control server, 11 ... Control part, 12 ... Transmission / reception part, 13 ... WDS channel determination part, 14 ... Inter-AP NW information database, 15 ... WDS available CH database, 2 ... Control base station, 31, 41, 51 ... Access point, 32, 42, 52 ... Control terminal station

Claims (8)

In a wireless communication system comprising a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system,
Detecting and notifying that the connection between the access points configured by the WDS function is disconnected to the server device;
The server device
When the disconnection notification is received, the channel that has been disconnected is identified, and other than the specified channel, the channel that has not been used for a predetermined time or more from the time when the previous disconnection occurred. By selecting the channel with the smallest number of times of connection disconnection and assigning the selected channel to all the wireless LAN access points constituting the connection between the access points that has been disconnected, the connection between the access points is established. A wireless communication system comprising control means for restructuring. The wireless LAN access point is
Disconnection detecting means for detecting that the connection between the access points configured by the WDS function is disconnected;
The wireless communication system according to claim 1, further comprising: a notification unit that notifies the server device that a connection disconnection has been detected when the connection disconnection is detected. A connection disconnection detecting means for monitoring the use channel status of the connection between the access points configured by the WDS function of the wireless LAN access point, and detecting the disconnection when the use is stopped;
The wireless communication system according to claim 1, further comprising: a notification unit that notifies the server device that a connection disconnection has been detected when the connection disconnection is detected. In a wireless communication system comprising a wireless LAN access point, a wireless communication system different from the wireless LAN system, and a server device that controls / monitors the wireless LAN access point using the wireless communication system,
A disconnection detecting means for detecting that the connection between access points configured by the WDS function is disconnected;
A wireless LAN access point comprising: notification means for notifying the server device that a disconnection has been detected when the disconnection is detected. A server device in a wireless communication system comprising: a wireless LAN access point; a wireless communication system different from the wireless LAN system; and a server device that controls / monitors the wireless LAN access point using the wireless communication system,
When the disconnection notification is received, the channel that has been disconnected is identified, and other than the specified channel, the channel that has not been used for a predetermined time or more from the time when the previous disconnection occurred. By selecting the channel with the smallest number of times of connection disconnection and assigning the selected channel to all the wireless LAN access points constituting the connection between the access points that has been disconnected, the connection between the access points is established. A server device comprising control means for restructuring. A wireless communication method performed by a wireless communication system comprising a wireless communication system different from a wireless LAN access point and a wireless LAN system and a server device that controls / monitors the wireless LAN access point using the wireless communication system,
Detecting and notifying the server device that the connection between the access points configured by the WDS function is disconnected;
When the disconnection notification is received, the channel that has been disconnected is identified, and other than the specified channel, the channel that has not been used for a predetermined time or more from the time when the previous disconnection occurred. By selecting the channel with the smallest number of times of connection disconnection and assigning the selected channel to all the wireless LAN access points constituting the connection between the access points that has been disconnected, the connection between the access points is established. A wireless communication method comprising: a reconstructing control step.   A wireless communication program for causing a computer to function as the wireless LAN access point according to claim 4.   A wireless communication program for causing a computer to function as the server device according to claim 5.

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