JP5652872B2 - Wireless relay device, wireless relay method and program - Google Patents

Description

  The present invention relates to a wireless relay device, a wireless relay method, and a program, and more particularly, to a wireless relay device that performs wireless relay communication between a public line and a wireless device.

  At present, people have a plurality of portable terminals (for example, portable game machines, smart phones, etc.). Most of these terminals are equipped with Wi-Fi (wireless fidelity). A plurality of communication providers provide a public Wi-Fi connection service through which these Wi-Fi terminals can communicate. These services are called public hotspots. When connecting to a public hotspot, people must go through an authentication procedure designated by each hotspot trader every time they communicate, and the work is complicated. In addition, when a user has a plurality of terminals, registration is required for each terminal, and an authentication procedure must be individually performed for each terminal each time it is used. A portable terminal is not always a device with an excellent user interface. For this reason, this operation is not an easy operation on a mobile terminal.

  A wireless relay device (so-called mobile router) that functions as a gateway between a public hotspot network and a Wi-Fi portable terminal is known (see, for example, Non-Patent Documents 1 and 2). Originally, mobile routers have become widespread as portable Wi-Fi access points for connecting mobile phone networks and Wi-Fi terminals, but there are also models that can be connected to public hotspot networks. Since the mobile router itself functions as the most familiar Wi-Fi access point for the user, the user can connect with a simple authentication method that is unified from the group of portable terminals that the user owns.

"Docomo 3G compatible" Portable Wi-Fi "is 37,000 yen, June 24 release", [online], May 25, 2010, IT Media Inc., Internet <URL: http: //www.itmedia .co.jp / news / articles / 1005/25 / news064.html> Saito, 1 other person, “Mobile wireless LAN router that has become even easier and more convenient”, [online], January 7, 2010, asahi.com (Asahi Shimbun) Digital Trend Check, Internet <URL: http : //www.asahi.com/digital/digitre/TKY201001060206.html>

  In order for a conventional mobile router to function, whether it is a public hotspot or a mobile phone network, there must be an external network that the person who owns the mobile router has the right to use. However, public hotspots are literally narrow and accessible areas. On the other hand, the mobile phone network has a large area but a low communication speed and a high access fee. As described above, since the convenience of external network connectivity is low, the layer using the mobile router is mainly an advanced business person, and the degree of diffusion to the general public is low.

  Accordingly, an object of the present invention is to propose a wireless relay device or the like that can greatly improve external network connectivity.

  The invention according to claim 1 is a wireless relay device, which is capable of controlling whether or not it can be connected to other wireless communication devices, via another wireless relay device, or other A wireless communication unit for WAN that can be connected to a public line by wireless communication without going through a wireless relay device; and a control unit that controls the operation of the wireless communication unit for LAN. When the WAN wireless communication unit can communicate with the public line via another wireless relay device or without passing through another wireless relay device with respect to the communication unit, other wireless communication If the WAN wireless communication unit is in a state where it cannot communicate with the public line through another wireless relay device or through another wireless relay device, Denied connection with other wireless communication devices It is intended to be in.

  The invention according to claim 2 is the wireless relay device according to claim 1, wherein the WAN wireless communication unit is connected to a LAN wireless communication unit included in the other wireless relay device, thereby The communication means communicates with the public line via a wireless relay device, and the control means is in a state in which the wireless communication unit for WAN can communicate with the public line without going through another wireless relay device. Or when the WAN wireless communication unit detects that it is connected to the LAN wireless communication unit of another wireless relay device and can communicate with the public line. It is determined that the state is communicable with the line, and the WAN wireless communication unit is not communicable with the public line without going through another wireless relay device, and is used for the LAN of the other wireless relay device. Wireless communication The wireless LAN for the WAN when it is detected that it is not in a state where it can be connected to the LAN, or is in a state where it can be connected to the LAN wireless communication unit of another wireless relay device but cannot communicate with the public line. It is determined that the communication unit is in a state where it cannot communicate with the public line.

  A third aspect of the present invention is the wireless relay device according to the first or second aspect, wherein the control means periodically detects a connection state between the public line and the WAN wireless communication unit and is disconnected. Whether the public line and the WAN wireless communication unit can communicate with each other when it was previously determined to be disconnected. A line selection means for performing state check means for detecting whether or not a state in which the public line and the wireless communication unit for WAN can communicate with each other is determined when the connection state was previously determined; The line selection means determines that it is in a disconnected state when it is not in a communicable state, and determines that it is in a connected state when it is in a communicable state and communicates with the wireless communication unit for LAN with other wireless communication Make it connectable to the device, The state confirmation means determines that the communication state is maintained when the communication state is maintained, and determines that the communication state is disconnected when the communication state is not reached. In this state, the connection with the communication device is refused.

  The invention according to claim 4 is the radio relay apparatus according to any one of claims 1 to 3, wherein the WAN radio communication unit is connected to a radio base station, and is one of the radio base stations. And connecting to the other wireless relay device to communicate with the public line via the other wireless relay device, and the control means interferes with the LAN wireless communication unit. A channel that is unlikely to occur is set so that it can be connected to the other wireless communication device, and the WAN wireless communication unit is connected to the plurality of wireless base stations with respect to the WAN wireless communication unit. If connection is possible, each radio base station is selected and connected in order, and when another radio relay device is selected as the radio base station, it is checked whether or not communication with the public line is possible Communication with the public line If it is in a ready state, it is determined that the WAN wireless communication unit is in a state where it can communicate with the public line, and when a wireless base station other than another wireless relay device is selected, it is in a state where it can communicate with the public line. If the wireless communication unit for WAN communicates with the public line without checking whether or not the communication with the public line is possible. It is determined that it is possible.

  The invention according to claim 5 is the wireless relay device according to any one of claims 1 to 4, wherein at least two pieces of identification information are allocated to the wireless communication unit for LAN, and other wireless relays The WAN wireless communication unit included in the apparatus is connected using specific identification information, and wireless communication devices other than the WAN wireless communication unit are connected using identification information other than the specific identification information.

  In the invention according to claim 6, the control means included in the wireless relay device is configured such that the WAN wireless communication unit does not pass through another wireless relay device or other wireless relay device with respect to the LAN wireless communication unit. If it is in a state where it can communicate with a public line, it can be connected to other wireless communication devices, and even if the WAN wireless communication unit passes through another wireless relay device, it does not pass through the other wireless relay device. If it is in a state where communication with the public line is not possible even if it is not, it is a wireless relay method including a control step for causing a connection with another wireless communication device to be rejected.

  The invention according to claim 7 includes a LAN wireless communication unit capable of controlling whether or not to perform wireless communication, and a public line via wireless communication via another wireless relay device or without passing through another wireless relay device. A computer in a wireless relay device comprising a WAN wireless communication unit capable of communicating with the LAN wireless communication unit, the WAN wireless communication unit via another wireless relay device or another wireless relay device If it is in a state where it can communicate with the public line without going through the wireless communication device, it can be connected to another wireless communication device, and even if the wireless communication unit for WAN passes through another wireless relay device, another wireless relay device This is a program for functioning as a control means for causing a connection with another wireless communication device to be rejected when the communication with the public line is not possible without going through.

  The present invention may be regarded as a computer-readable recording medium on which the program according to claim 7 is recorded (steadily).

  According to the invention according to each claim of the present application (hereinafter referred to as “the present invention”), a plurality of wireless relay devices (for example, a mobile router, a peripheral network device connected to a computer, and a function equivalent to the mobile router) The latter is, for example, a USB dongle type or card type wireless interface module, etc.), and has a function of relay connection to each other, and the relay path is connected in a loop to connect to an external line. By constructing a relay path while avoiding the phenomenon of being blocked, the external network connectivity in the wireless relay device can be greatly improved. As described above, the present invention includes not only a public hot spot but also another wireless relay device as a wireless base station, so that the wireless relay device is directly connected to the public hot spot (ie, “other In addition to connecting to a public line (without going through a wireless relay device), it is also possible to connect to another wireless relay device and check the communicable state with the public line. Wireless communication (for example, wireless communication with other wireless relay devices, portable terminals, etc.) is made possible. Thereby, the connection environment to the public line can be greatly improved.

  Furthermore, the communication environment of a specific public hotspot is significantly improved by interposing the wireless relay device. In other words, not only a public hot spot but also a wireless relay device can be connected in the communicable area, so that the communication area is expanded. Furthermore, each wireless relay device is not forcibly connected to a public hotspot that may be installed far away, but by securing a communication path with the public hotspot via a nearby wireless relay device A more stable communication state can be obtained.

  That is, according to the present invention, the wireless relay devices can cooperate with each other to provide a wide connectable area, and provide a new connection option to a user who does not have the right to use the external network. It becomes possible.

  In particular, according to the present invention, it is possible to suppress a relay loop by checking not only the connection to the radio base station but also the communication state with the public line for the WAN radio communication unit. A route control technique can be realized. Furthermore, with respect to the portable terminal, the wireless relay device intervenes, so that the authentication policy can be set in the wireless relay device, and it is possible to prevent free ride by a malicious user.

It is a schematic block diagram of the radio | wireless communications system concerning the Example of this invention. It is a figure which shows an example of the state transition of WMA7 of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

FIG. 1 is a block diagram showing an outline of a wireless communication system according to an embodiment of the present invention. Wireless communication system 1, the Internet 3 (an example of "public line" in the claims), a public hot spot 5, n pieces of _{WMA (Wireless Multihop Aggregator) 7 1} , ..., 7 n ( in the claims " An example of “wireless relay device” (hereinafter, subscripts are omitted in the case of meaning plural) and a portable terminal 9 (for example, a portable game machine, a smartphone, a notebook PC, etc.) (“ An example of “wireless communication device”. The present embodiment is particularly characterized in that a connection rule to the Internet 3 (WAN line connection rule) is proposed for each WMA 7 by explaining the operation of each WMA 7.

  The public hot spot 5 includes a LAN wireless communication unit 11. The LAN wireless communication unit 11 can wirelessly communicate with the WMA 7 and the portable terminal 9. In other words, it functions as an access point (LAN AP) in the LAN. The WMA 7 and the portable terminal 9 are connected to the public hot spot 5 directly or via the WMA 7 to access the Internet 3.

  The WMA 7 includes a WAN wireless communication unit 21 (an example of “WAN wireless communication unit” in the claims of the present application), a control unit 25 (an example of “control means” in the claims of the present application), and a LAN wireless communication unit 23 ( An example of “a wireless communication unit for LAN” in the claims of the present application. The control unit 25 includes a line selection unit 27 (an example of “line selection unit” in the claims of the present application) and a state confirmation unit 29 (an example of “state confirmation unit” in the claims of the present application). Note that the LAN wireless communication unit 11 and the WAN wireless communication unit 21 may use physically different wireless communication interfaces or physically switch one wireless communication interface in software.

  The LAN wireless communication unit 23 can perform wireless communication with the portable terminal 9 as in the conventional mobile router. Therefore, the LAN wireless communication unit 23 also functions as an access point (LAN AP) in the LAN. The LAN wireless communication unit 23 can also perform wireless communication with the WAN wireless communication unit of another WMA 7 (in this case, the other WMA 7 is an example of “another wireless communication device” in the claims of this application). .) In the present embodiment, a conventional mobile router without a relay function can be positioned as an example of the mobile terminal 9. Whether or not the wireless communication unit for LAN 23 can perform wireless communication between the mobile terminal 9 and another WMA 7 is controlled by the on / off control of the control unit 25.

  The LAN wireless communication unit 23 is assigned an identification name usually called ESSID (an example of “identification information” assigned to the LAN wireless communication unit in the claims of this application). By differentiating the ESSID for connecting the mobile terminal 9 and the ESSID for relay connection of the other WMA 7, and restricting the connection to the latter ESSID to only the WMA 7, the wireless device without the authority of wireless relay can be used. Intentional access can be prevented. Further, by making the latter ESSID non-broadcasting, it is possible to avoid the problem that other unintentional wireless communication devices are relay-connected. Furthermore, different security rules can be applied for each ESSID. For example, security rules that are intended for simple connection procedures are applied to mobile terminals 9, while strict security rules are applied to trunk lines that require high secrecy. A flexible network configuration is possible.

The WAN wireless communication unit 21 connects to the LAN wireless communication unit 11 of the public hot spot 5 directly (that is, without passing through another WMA 7) or through another WMA 7. The WAN wireless communication unit 21 not only connects the public hot spot 5 as a wireless base station, but also connects other WMAs 7 as wireless base stations. In FIG. 1, WMA 7 ₁ and 7 ₂ are directly connected to public hotspots. WMA7 _n is connected via the WMA7 _1. That, WMA7 _n, by connecting the wireless communication to the LAN wireless communication unit 23 of WMA7 _1, a state of being connected to the Internet 3 by using the connection between WMA7 ₁ and the public hot spot 5.

  The control unit 25 performs on / off control of the LAN wireless communication unit 23 by confirming a communication state between the WAN wireless communication unit 21 and the Internet 3. That is, the control unit 25 provides a function as a wireless access point by turning on the LAN wireless communication unit 23 when the WAN wireless communication unit 21 can communicate with the Internet 3. Let me. When the WAN wireless communication unit 21 cannot communicate with the Internet 3, the LAN wireless communication unit 23 is turned off so that it does not function as a wireless access point. A specific operation of the control unit 25 will be described with reference to FIG. Here, the method for turning off the wireless communication unit for LAN 23 includes, for example, a case where the power supply is cut off and the wireless communication unit 23 is not fully functioning, a case where power supply is performed but a request for any connection is rejected. is there.

  FIG. 2 is a diagram illustrating an example of state transition of the WMA 7 in FIG. When the WMA 7 is activated, the control unit 25 sets the WAN wireless communication unit 21 to an on state to enable wireless communication, and sets the LAN wireless communication unit 23 to an off state (state ST1). The WAN wireless communication unit 21 is simply turned on and has not established a communication path with the Internet 3. Therefore, in the initial state, a state where communication between the WAN wireless communication unit 21 and the Internet 3 is not confirmed (hereinafter referred to as “disconnected state”) (state ST2).

  When in the disconnected state, the line selection unit 27 periodically detects whether or not the Internet 3 and the WAN wireless communication unit 21 can communicate with each other (state ST3). In FIG. 2, detection is performed every 5 seconds as an example. This detection operation will be specifically described.

Table 1, and ESSID of the wireless communicable radio base station for WAN radio communication section 21 of WMA7 ₁ detects a connection priority granted in advance for each ESSID, which is an example of the RSSI of the beacon. For example, the wireless communication unit for WAN 21 performs channel scanning (measurement of received power intensity of packets such as beacons transmitted by the wireless base station). The RSSI of the beacon is one index indicating the stability of the communication environment with the radio base station.

Which ESSID radio base station is connected to may be given priority to connection priority or priority to RSSI. In the case of giving priority to the connection priority, in the example of Table 1, the access points of the company A and the company C to which the connection priority 1 is given are candidates to be connected. Next, the access point having the larger value than the received RSSI level of the beacon signal transmitted from the access points of both companies, that is, the access point of Company C is selected as the access point to be finally connected. When giving priority to RSSI, in the example of Table 1, the access point of WMA 7 _n having the highest RSSI value is selected as the access point to be connected. Although an example in which more stable radio base stations are selected and connected in order has been described here, the priority order is not limited to such a method.

  The WMA 7 in this embodiment is a wireless relay device that can be relay-connected to other neighboring WMAs 7. However, the neighboring WMA 7 is not always connected. This is because the WMA 7 to which the relay connection is made is not necessarily in a state where it can be connected to the Internet due to the movement of the WMA 7 and changes in the surrounding radio wave environment. If the connection to the WMA 7 that is disconnected from the Internet is relay-connected, the connection to the Internet cannot be made, and a circulation of the relay path (relay loop) may occur, resulting in a network failure.

In the conventional mobile router, it was possible to determine that it was connected to the Internet 3 simply by being able to connect to the LAN wireless communication unit 11 of the public hot spot 5. However, WMA 7 ₁ cannot immediately determine that it can connect to the Internet 3 when it detects a state in which it can connect to at least the neighboring WMA 7. Therefore, at least in this case, processing different from the conventional mobile router is required. When connecting to at least the neighboring WMA 7, for example, the line selection unit 27 accesses a specific external Internet site, and when it is confirmed that the access has been made, it can communicate with the public line. Judgment (hereinafter referred to as “connection state”).

  For example, the line selection unit 27 selects a connection with a public hotspot of company C having a connection priority of 1 and the highest RSSI level in the situation of Table 1. If the connection with the public hotspot of Company C can be established, it may be determined that the Internet 3 is accessible (in this case, it may be determined whether communication is possible by accessing a specific site). ).

If the connection with the public hotspot of company C fails, the line selection unit 27 selects the access point of company A with the next highest RSSI level, and if the connection with the access point of company A fails, the line selection unit 27 B selects an access point of Company B having a high connection priority. When at least WMA is selected, the WAN wireless communication unit 21 not only can connect to the LAN wireless communication unit of the connected access point, but also determines whether or not it can access a specific external site. It is determined that communication with the public line is possible for the first time after inspection and access. For example, in the state of FIG. 1, the WMA 7 _n is connected to the Internet 3 via the WMA 7 ₁ . WMA7 even ₁ connects to WMA7 _n, is off and the upstream line WMA7 _n, further, it is not possible to access loop occurs in the specific site of the Internet 3 between WMA7 ₁ and WMA7 _n. Therefore, in this case, it is determined that the connection with the public line is not possible.

  As described above, in the state ST3, the line selection unit 27 determines whether or not a connectable wireless base station (public hot spot, neighboring WMA, etc.) is connectable to the WAN wireless communication unit 21, If at least the wireless base station is a nearby WMA 7, it is checked whether it can access the Internet 3 to determine whether it is in a connected state. If the connection state cannot be confirmed at all, it is determined that the connection is in the disconnected state, the selection is unsuccessful, and the process returns to the state ST2. If there is a line whose connection state has been confirmed, it is determined that the selection is successful and the process moves to state ST4.

  In the state ST4, the wireless communication unit for LAN 23 is turned on so that the wireless communication with the portable terminal 9, the nearby WMA 7 or the like is possible. Here, the line selection unit 27 performs a process of causing the LAN wireless communication unit 23 to perform channel scanning and assigning a channel that is not used at all or has the lowest reception level. As a result, the LAN wireless communication unit 23 can set a channel that is less likely to cause interference. And it is judged as a connection state (state ST5). By performing this channel scan periodically regardless of whether the wireless communication unit for LAN is in an on state or an off state, the WMA 7 can obtain statistics of interference levels over a long period of time. As a result, it is possible to detect a more accurate empty channel.

  When in the connected state, the state confirmation unit 29 periodically detects whether or not a state in which the Internet 3 and the wireless communication unit for WAN 21 can communicate is maintained (state ST6). In FIG. 2, detection is performed every 60 seconds. For example, it is detected whether or not a specific site can be accessed. If it can be accessed, it is determined that the connection is successful, and the state returns to the state ST5. If unsuccessful, the wireless communication unit for LAN 23 is turned off, and a connection with the portable terminal 9 or a nearby WMA 7 is rejected (state ST7). And it transfers to state ST2.

  In FIG. 2, WAN line selection (state ST3) is performed every 5 seconds, and WAN line connection state confirmation (state ST6) is performed every fixed time of 60 seconds. However, the present invention is not limited to this. For example, the interval may be changed so that the interval is increased if the change in the communication environment is small and the interval is decreased if the change in the communication environment is large. .

  The MWA 7 and the public hot spot 5 (referred to as “nodes” in this paragraph) each have a transmission cycle, and each node has a function of periodically transmitting a frame according to the transmission cycle. Good. The inventor has shown that by using such intermittent periodic transmission (IPT), packet relay transmission with high transmission efficiency can be realized in a multi-hop network (Japanese Patent Laid-Open No. 2005-143046). Etc.)

  According to the present embodiment, not only the public hot spot 5 but also the neighboring WMA 7 can be included as a radio base station. Then, not only when the WMA 7 is directly connected to the public hotspot 5 but also when it is connected to the neighboring WMA 7 and the communicable state with the Internet 3 can be confirmed, wireless communication by the LAN wireless communication unit 23 is performed. Make it possible.

  Furthermore, the communication environment of the public hot spot 5 is significantly improved by interposing the WMA 7. That is, the communication area is expanded because not only the public hot spot 5 but also each WMA 7 can be connected. Furthermore, each WMA 7 is more stable by securing a communication path with the public hot spot 5 through the neighboring WMA 7 rather than forcibly connecting with the public hot spot 5 which may be installed in the distance. Communication state can be obtained.

  In particular, according to the present invention, it is possible to suppress the relay loop by checking not only the connection to the wireless base station but also the communication state with the Internet 3 for the WAN wireless communication unit 21. A simple route control method can be realized. Furthermore, with respect to the portable terminal, the wireless relay device intervenes, so that the authentication policy can be set in the wireless relay device, and it is possible to prevent free ride by a malicious user.

3 Internet, 5 public hotspots, 7 ₁ ,..., 7 _n WMA, 9 mobile terminal, 21 WAN wireless communication unit, 23 LAN wireless communication unit, 25 control unit, 27 line selection unit, 29 status confirmation unit

Claims (7)

A wireless relay device,
And other wireless communication devices and wireless communication can be turned on state and the other radio communication device and the wireless communication unit for the off state and can control a LAN that can not be wireless communication,
Without passing through the with or other radio relay device via another radio relay apparatus, and WAN wireless communication unit capable of communicating with the public line through wireless communication,
Control means for controlling the on / off state of the wireless communication unit for LAN,
Wherein,
When the WAN wireless communication unit can communicate with the public line via another wireless relay device or without passing through another wireless relay device, the LAN wireless communication unit is turned on. to,
If the WAN wireless communication unit cannot communicate with the public line through another wireless relay device or through another wireless relay device, the LAN wireless communication unit is turned off. you to the state, the radio relay device. The WAN wireless communication unit communicates with the public line via the other wireless relay device by connecting to the LAN wireless communication unit included in the other wireless relay device.
The control means includes
The wireless communication unit for the WAN, it has detected that the state capable of communicating with the public network without passing through the other wireless relay apparatus, or a connection like the LAN wireless communication unit of the other wireless relay apparatus When it is detected that the wireless communication unit for WAN is able to communicate with the public line, it is determined that the wireless communication unit for WAN is capable of communicating with the public line.
The wireless communication unit for the WAN, even if not in a state capable of communicating with the public network without passing through the other wireless relay apparatus, or nor connected state with the LAN wireless communication unit of other radio relay apparatuses, or, when it is detected that the LAN wireless communication unit of the other wireless relay apparatus and the public line as a connection state is a state that can not communicate, the wireless communication unit for WAN and the public line The wireless relay device according to claim 1, wherein it is determined that communication is not possible. The control means periodically detects the connection state between the public line and the WAN wireless communication unit to determine whether it is in a disconnected state or in a connected state,
A line selection means for detecting whether or not the public line and the WAN wireless communication unit can communicate with each other when it was previously determined to be in a disconnected state;
A state confirmation means for detecting whether or not a state in which the public line and the WAN wireless communication unit can communicate with each other when the connection state was previously determined is detected;
The line selection means includes
If it is not ready to communicate, it is determined to be disconnected,
When it is in a state where communication is possible, it is determined as a connection state and the wireless communication unit for LAN is turned on ,
The state confirmation means includes
If the state where communication is possible is maintained, the connection state is determined.
The wireless relay device according to claim 1 or 2, wherein when the communication is no longer possible, the LAN wireless communication unit is determined to be in a disconnected state and the LAN wireless communication unit is turned off . The wireless communication unit for WAN is connected to a wireless base station, and is connected to the other wireless relay device as one of the wireless base stations, thereby connecting the public line via the other wireless relay device. Communicate with
The control means includes
For the wireless communication unit for LAN, a channel that is unlikely to cause interference is set so that it can be connected to the other wireless communication device.
When the WAN wireless communication unit can be connected to the plurality of wireless base stations, the wireless wireless communication unit for WAN is selected and connected in order,
When another radio relay apparatus is selected as a radio base station, the WAN radio communication unit checks whether the communication with the public line is possible by checking whether the communication with the public line is possible. Judge that you can communicate with the line,
When a radio base station other than the other radio relay device is selected, it is checked whether it can communicate with the public line, and if it can communicate with the public line, or can communicate with the public line The wireless relay device according to any one of claims 1 to 3, wherein the WAN wireless communication unit determines that the state is communicable with the public line without checking whether the state is in a state. At least two pieces of identification information are allocated to the wireless communication unit for LAN,
The wireless communication unit for WAN included in another wireless relay device connects using specific identification information,
The wireless relay device according to claim 1, wherein wireless communication devices other than the wireless relay device are connected using identification information other than the specific identification information. Control means provided in the wireless relay device ,
When the wireless communication unit for WAN included in the wireless relay device can communicate with the public line via another wireless relay device or without passing through another wireless relay device, the LAN included in the wireless relay device the use radio communication unit to the other wireless communication devices and wireless communication can be turned on,
When the WAN wireless communication unit cannot communicate with the public line through another wireless relay device or through another wireless relay device, the LAN wireless communication unit radio relay method comprising the control steps you off state can not be a wireless communication device and wireless communication. A wireless communication unit for LAN capable of controlling whether or not to perform wireless communication, and a wireless communication unit for WAN capable of communicating with a public line by wireless communication via another wireless relay device or without passing through another wireless relay device A computer in a wireless relay device comprising :
When the WAN wireless communication unit can communicate with a public line via another wireless relay device or without passing through another wireless relay device, the LAN wireless communication unit is connected to another wireless communication device. And turn on so that you can wirelessly communicate with
When the WAN wireless communication unit cannot communicate with the public line through another wireless relay device or through another wireless relay device, the LAN wireless communication unit program for functioning as a control means you off state can not be a wireless communication device and wireless communication.

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