JP5557349B2 - Wireless relay device, wireless relay method, and wireless relay program - Google Patents

Description

  The present invention relates to a wireless relay device having a function as a wireless LAN base unit and an interface for connecting to a wide area high-speed wireless communication service.

  In recent years, as cloud services and the like have increased with the ubiquity, there is an increasing demand for exchanging information with a portable information terminal even when away from home. Along with this, information terminals such as mobile PCs (Personal Computers), netbooks, smartphones, etc. are small and easy to carry. These information terminals are equipped with a wireless communication technology (IEEE802.11a / b / g / n) called wireless LAN (Local Area Network), and a frequency band (industry-science-medical) (ISM) band ( 2.4 GHz or 5 GHz) is used to perform wireless communication.

  Wireless LAN has a communication range of only a few hundred meters, but is treated as a wireless station in a low-power data communication system, so it does not require a license for operation of the wireless station and can be used as an easy means for connecting to the Internet. Many information terminals are compatible. In order to connect an information terminal (wireless LAN slave unit) compatible with a wireless LAN to the Internet, the wireless terminal can receive communication from the wireless LAN slave unit and transfer the communication to an interface connected to the Internet network. A LAN base unit is required. A general wireless LAN base unit is fixedly installed at one corner of an office or home and connected to an interface of a fixed high-speed Internet network such as an optical fiber line. Then, a space within a certain distance from the wireless LAN base unit can be connected to the Internet by wireless LAN communication.

  In recent years, wide-area high-speed wireless communication services that make use of wireless communication technology used in mobile phones have become widespread in response to demands for connecting to the Internet on the go. Examples of these wide area high speed wireless communication services include 3G (3rd Generation), LTE (Long Term Evolution), and WiMAX (Worldwide Interoperability for Microwave Access).

  These wide area wireless communication services cover a wide area of about 2km radius with one base station, and by connecting base stations together, it is possible to seamlessly connect between adjacent base stations. Communication is not interrupted while moving. However, communication terminals that support these communication standards alone are expensive, and a contract with a service provider is required for each connected terminal. I am struggling.

  For this reason, products in the field of wireless relay devices (mobile routers) that incorporate a small rechargeable battery such as a lithium ion battery, have an interface compatible with a wide-area wireless communication standard, and have a function as a wireless LAN base unit. It has become widespread. The mobile router requires a contract with a service provider for connection to wide area wireless communication, but since it has a function as a wireless LAN base unit, a plurality of wireless LAN slave units can be connected. In addition, because it is operated using a rechargeable battery and is portable, if it can be connected to wide area wireless communication on the go, an area that can be connected to the Internet using wireless LAN communication within a predetermined range centered on the mobile router Can be made.

  However, these mobile routers, unlike routers installed and used indoors, have a problem that the wireless environment is not stable because the device itself always moves. In addition, since limited radio channel resources are shared by all terminals existing in one area, there is a problem that communication quality deteriorates in an area where the population is dense. In order to avoid such a problem, for example, there is a mobile router that supports a plurality of wide area wireless communications and connects to the Internet by a method capable of obtaining the highest communication quality according to the communication environment.

  In addition to using a wide-area wireless communication service using a mobile router, a wireless LAN base unit is installed at a storefront in a town, etc., so that an information terminal having the function of a wireless LAN handset can be connected to the Internet. Public wireless LAN services have also become widespread.

  In addition, in order to support these services, there are terminals (for example, a mobile router) having a function of connecting to a wireless LAN at the same time as a function of communicating with a wide area wireless communication service (for example, see Patent Document 1). Such a mobile router records public wireless LAN connection information in advance, and automatically enters the public wireless LAN service when entering an area that is not covered by wide area wireless communication or an area where the public wireless LAN exists. And connect to the Internet with better communication quality.

JP 2005-57551 A

  Two or more wireless relay devices that use one wireless LAN base unit function (hereinafter referred to as AP function) and one or more other wireless communication interfaces to relay communication data between the wireless networks. The wireless control device is installed.

  Many of the wireless relay devices having the AP function can be connected to a wireless LAN slave device (hereinafter referred to as an STA device) regardless of whether the connection with the base station of the transfer destination wireless communication interface is established. is there. Therefore, if the wireless connection status from the STA device connected to the wireless relay device is good, but the connection status with the higher-level network on the transfer destination side cannot be grasped, when data transfer is started from the STA device, the higher-level network There is a problem that communication may fail because the connection to is not established.

  In addition, a wireless relay device having a plurality of wireless communication interfaces for connecting to a higher level network, a wireless relay capable of selecting a network for transferring communication data from the wireless LAN slave unit depending on the wireless communication status with the base station of each wireless communication interface There is a device. In such a wireless relay device, the switching timing of the wireless communication interface for transferring data from the STA machine is mostly limited to when each network is disconnected due to deterioration of the wireless environment. In such a wireless relay device, even if the wireless communication environment of the higher-level interface being connected deteriorates and the communication environment of other wireless communication interfaces is improved, the wireless interface currently used As long as it is not disconnected, other interfaces are often not selected. Therefore, even if there is an interface that can perform better communication than the current situation, there is a problem that the interface may not be effectively used.

  In addition, wireless relay devices that can be connected to a public wireless LAN as an upper line and can relay communications between wireless LAN slave units are compared with the case where a relay process becomes a bottleneck and is directly connected by a wireless LAN. Thus, there is a problem that communication throughput may be reduced.

  An object of the present invention is to provide a wireless relay device that can improve the connectivity of a wireless LAN slave device to an upper network.

The wireless relay device according to the present invention measures an upper wireless interface unit having a communication interface that communicates with an upper base station, a lower wireless interface unit that communicates with a wireless LAN slave unit, and a radio wave condition for an external wireless LAN base unit A wireless LAN environment measurement unit that performs data transfer processing between the lower wireless interface and the upper wireless interface unit, and the upper wireless interface unit has a predetermined disconnectable level of radio wave intensity with respect to the base station A relay processing device that stops the transfer process when the intensity of radio waves with respect to the external wireless LAN base unit is greater than or equal to a predetermined connectable level, the disconnectable level and the connectable level Have the same level and a predetermined range of width .

The wireless relay method according to the present invention communicates with an upper base station, communicates with the wireless LAN slave unit, measures a radio wave condition with respect to an external wireless LAN master unit, and communicates between the base station and the wireless LAN slave unit. The wireless radio wave intensity with respect to the base station is equal to or lower than a severable level having a predetermined range of width , and the radio radio wave intensity with respect to the external wireless LAN base unit is the severable level. The transfer process is stopped when the level is equal to or higher than a predetermined connectable level having the predetermined range and the width .

The wireless relay program according to the present invention measures a higher-level wireless communication process for communicating with a higher-order base station, a lower-order wireless communication process for communicating with a wireless LAN slave unit, and a radio wave condition for an external wireless LAN base unit. A wireless LAN environment measurement process and a data transfer process between the base station and the wireless LAN slave unit are performed, and the intensity of the radio wave with respect to the base station is equal to or lower than a predetermined disconnectable level having a predetermined range width . When the intensity of the radio wave with respect to the external wireless LAN base unit is the same level as the disconnectable level and is equal to or higher than a predetermined connectable level having a width of the predetermined range, the relay process for stopping the transfer process Are executed.

  ADVANTAGE OF THE INVENTION According to this invention, the connectivity to the high-order network of a wireless LAN subunit | mobile_unit can be improved.

It is explanatory drawing which shows the structural example of the communication system containing the radio relay apparatus of 1st Embodiment by this invention. It is explanatory drawing which shows the positional relationship before the movement of the radio relay apparatus in an Example. It is explanatory drawing which shows the positional relationship after the movement of the radio relay apparatus in an Example. It is explanatory drawing which shows the transition of the intensity | strength of the received radio wave from wireless LAN main | base station (AP2), and the intensity | strength of the received radio wave from WiMAX base station (BS1). It is explanatory drawing which shows the example of a connection setting to the high-order network which a relay processing apparatus memorize | stores. It is explanatory drawing which shows the communication system containing the radio relay apparatus of 2nd Embodiment by this invention.

Embodiment 1. FIG.
FIG. 1 is an explanatory diagram illustrating a configuration example of a communication system including the wireless relay device 200 according to the first embodiment (first embodiment). The wireless relay device 200 illustrated in FIG. 1 includes a lower wireless interface unit 201, an upper wireless interface unit 202, a wireless LAN environment measuring unit 203, and a relay processing device 204. The wireless relay device 200 is a portable wireless relay device that is carried and used with the wireless LAN slave device (STA2) 301, for example.

  The lower wireless interface unit 201 has a wireless LAN interface (AP1) 201a. The wireless LAN interface (AP1) 201a operates as a base AP (AccessPoint) for wireless LAN communication based on the operation principle defined in IEEE 802.11. The wireless LAN interface (AP1) 201a is connected to an antenna, demodulates a radio wave received from the antenna based on a wireless communication standard defined by IEEE 802.11, and connects the demodulated data to the relay processing device 204 connected thereto. Send to. The wireless LAN interface (AP1) 201a modulates the data packet received from the relay processing device 204 based on a wireless communication standard defined in IEEE 802.11, and transmits a wireless radio wave from the antenna.

  The upper wireless interface unit 202 has a WiMAX communication interface (MS1) 202a. The WiMAX communication interface (MS1) 202a operates as a land mobile station MS (Mobile Station) for WiMAX communication based on the operation principle defined in IEEE 802.16. The WiMAX communication interface (MS1) 202a is connected to an antenna, demodulates a radio wave received from the antenna based on a wireless communication standard defined by IEEE 802.16, and the relay processing device 204 to which the demodulated data is connected. Send to. The WiMAX communication interface (MS1) 202a modulates the data received from the relay processing device 204 based on a wireless communication standard defined in IEEE 802.16, and transmits a wireless radio wave from the antenna.

  The wireless LAN environment measurement unit 203 includes a wireless LAN measurement interface (STA1) 203a. The wireless LAN measurement interface (STA1) 203a is connected to an antenna, and can demodulate a radio wave received from the antenna based on a radio communication standard defined by IEEE 802.11, and measure a radio LAN radio environment around the device.

  The relay processing device 204 performs data transfer processing between the lower wireless interface unit 201 and the upper wireless interface unit 202 and monitors the wireless communication status of each interface. The relay processing device 204 transfers the data to the upper wireless interface unit 202 according to the destination of the data received from the lower wireless interface unit 201. Further, the relay processing device 204 transfers the data received from the upper wireless interface unit to the lower wireless interface unit 201. Further, the relay processing device 204 constantly reads parameters (radio wave reception intensity and radio wave quality value) in the wireless communication of the wireless LAN interface (AP1) 201a, the wireless LAN measurement interface (STA1) 203a, and the WiMAX interface (MS1) 202a. be able to.

  A wireless LAN handset (STA2) 301 connected to the Internet exists in a range where an identification signal (beacon) transmitted from the wireless LAN interface (AP1) 201a can be received. In the example shown in FIG. 1, a wireless LAN base unit (AP2) 401 and a WiMAX base station (BS1) 402 exist around the wireless relay device (RT1) 200. A wireless LAN base unit (AP2) 401 and a WiMAX base station (BS1) 402 are both communication relay apparatuses connected to the Internet network 501 as an upper network.

  Hereinafter, the operation of the wireless relay device (RT1) 200 of the present embodiment will be described using an example. FIG. 2 is an explanatory diagram showing a positional relationship of the wireless relay device (RT1) 200 before moving in the embodiment. As shown in FIG. 2, one mobile person is carrying a wireless LAN slave (STA 2) 301 and a wireless relay device (RT 1) 200. In addition, there is always a wireless LAN handset (STA2) 301 that is connected to the Internet in a range in which an identification signal (beacon) transmitted from the wireless LAN interface (AP1) 201a can be received. The position of the moving person at this time is defined as position A.

  A wireless LAN base unit (AP2) 401 and a WiMAX base station (BS1) 402 are present around the wireless relay device (RT1) 200. The wireless relay device (RT1) 200 is connected to the Internet network 501 via a wireless LAN base unit (AP2) 401 or a WiMAX base station (BS1) 402.

  When the mobile person is at position A, the relay processing device 204 cannot receive the identification signal of the wireless LAN base unit (AP2) 401 and can communicate with the WiMAX base station (BS1) 402. Therefore, the WiMAX interface (MS1) 202a is selected and connected to the WiMAX base station (BS1) 402. Further, the wireless LAN measurement interface (STA1) 203a constantly searches for the wireless LAN radio wave environment around the own device, and at this time, recognizes that the surrounding of the own device is an environment where the beacon of the wireless LAN base unit does not exist. doing.

  The operation of each device when the mobile person moves from position A to position B from the state shown in FIG. FIG. 3 is an explanatory diagram showing a positional relationship after movement of the wireless relay device (RT1) 200 in the embodiment. FIG. 4 is an explanatory diagram showing the transition of the received radio wave intensity between the WiMAX interface MS1 and the wireless LAN measurement interface STA1.

  As shown in FIG. 3, since the radio relay apparatus (RT1) 200 moves away from the WiMAX base station (BS1) 402 due to the movement to the position B, the radio wave environment for WiMAX has deteriorated. On the other hand, the wireless relay device (RT1) 200 can be connected to the wireless LAN base unit (AP2) 401 by approaching the wireless LAN base unit (AP2) 401. At this time, the wireless LAN measurement interface (STA 1) 203 a measures the radio wave intensity with respect to the wireless LAN base unit (AP 2) 401 and sends it to the relay processing device 204. Also, the relay processing device 204 obtains information on the received radio waves from the WiMAX base station (BS1) 402 from the higher-level wireless interface unit 202.

  FIG. 4 is an explanatory diagram showing a transition between the intensity of the received radio wave from the wireless LAN base unit (AP2) 401 and the intensity of the received radio wave from the WiMAX base station (BS1) 402. As shown in FIG. 4, at position B, the radio wave received from the WiMAX base station (BS1) 402 is stronger than the radio wave received from the wireless LAN base unit (AP2) 401. Therefore, the wireless LAN slave unit (STA2) 301 If the communication is performed through the wireless LAN base unit (AP2) 401, the communication throughput to the Internet network becomes faster. In this case, the relay processing device 204 switches the connection method to the higher level network by stopping the transfer process between the lower level wireless interface unit 201 and the higher level wireless interface unit 202.

  Hereinafter, the control regarding the switching of the connection of the relay processing apparatus 204 to the higher level network will be described in detail. FIG. 5 is an explanatory diagram illustrating an example of setting a connection to the upper network stored in the relay processing device 204. As shown in FIG. 5, the relay processing device 204 includes an identification ID, a connection priority, a connection priority of a wireless LAN base unit and a wide area wireless communication service (such as WiMAX) designated by the user as a connection destination to the upper network. The setting of the possible level and the connectable level is recorded.

  The connectable level indicates the intensity of received radio waves required for connecting to each connection destination. The disconnectable level indicates the intensity of received radio waves for disconnecting the current connection and switching to another connection when another network is connectable while connected to one connection destination. . In the setting example shown in FIG. 5, the connection destination weighting means is expressed by a connectable level and a disconnectable level, and each is divided into three levels. This level division is not limited to three levels, and parameters relating to radio quality such as a received radio wave intensity value (RSSI) may be designated linearly.

  According to the example of FIG. 5, when the received radio wave intensity of the WiMAX base station (BS1) 402 is less than the disconnectable level, the radio wave intensity of any of the wireless LAN base units (AP2 to AP4) can be connected. In the case of the above, the wireless LAN slave unit (STA2) 301 switches the connection. In that case, the relay processing device 204 disconnects the connection with the WiMAX interface (MS1) 202a, stops the AP operation of the wireless LAN interface (AP1) 201a, and connects between the lower wireless interface unit 201 and the upper wireless interface unit 202. Stop the transfer process.

  The wireless LAN slave device (STA2) 301 searches for another connection destination when the wireless LAN interface (AP1) 201a connected at the position A is stopped and communication is disconnected. Since the wireless LAN slave device (STA2) 301 exists at substantially the same position as the wireless relay device (RT1) 200, the radio wave condition is also substantially the same. When the setting example shown in FIG. 5 is used, for example, if the received radio wave intensity for all of the wireless LAN base units (AP2 to AP4) is at or above the connectable level, the wireless LAN slave unit (STA2) 301 Is connected to the wireless LAN base unit (AP2) 401 having the highest value.

  In the wireless relay device (RT1) 200 of the present embodiment, the environment measurement interface (wireless LAN measurement interface (STA1) 203) is a single interface, but the configuration is not limited thereto. For example, if the lower-layer wireless interface unit 201 performing the AP operation has a function capable of searching for the surrounding radio wave environment simultaneously with the AP operation, the environment measurement interface may not be installed. . With such a configuration, the apparatus can be saved in space.

  In addition, the wireless relay device (RT1) 200 according to the present embodiment has a function of stopping its own wireless communication operation using a specific condition as a trigger as described above. By using this function, installing one wireless LAN base unit (AP unit) in a specific area where you do not want to perform wireless communication, and recording that AP unit as the highest priority connection destination in the wireless relay device In a specific area, a usage method of prohibiting wireless communication operation may be performed.

  Also, in this embodiment, an example in which WiMAX is applied as a wide area wireless communication service has been described. Other wide area wireless communication services may be applied.

  As described above, the wireless relay device (RT1) 200 according to the present embodiment stores connection settings including priorities for connectable wireless LAN base units and wide area wireless communication service base stations. Therefore, it is possible to smoothly reconnect the wireless LAN terminal to the wireless LAN base unit desired by the user even during movement. As a result, the communication throughput of the wireless LAN slave unit can be improved. Also, when using an external wireless LAN base unit, since the wireless LAN slave unit is directly connected to the wireless LAN base unit, the relay processing does not become a bottleneck, and the communication throughput of the wireless LAN slave unit is reduced. Improvement can be expected.

  When the wireless relay device (RT1) 200 according to the present embodiment determines that the wireless LAN slave device can be directly connected to the external wireless LAN master device according to the connection setting, the transfer processing of the relay processing device 204 is performed. Since the AP operation of the wireless LAN interface (AP1) 201a is stopped, wasteful power consumption can be reduced. Since the wireless relay device (RT1) 200 is portable and has limited power, there is an effect that the continuous operation time of the device is increased by reducing power consumption.

  In addition, the wireless relay device (RT1) 200 according to the present embodiment is a wireless LAN measurement interface (STA1) that can only receive in order to monitor a radio wave state, instead of an upper wireless LAN interface that can be connected to a public wireless LAN. ) 203a was implemented. Therefore, a wireless transmission circuit is not required, and the processing device can be simplified as compared with a general wireless relay device having a higher-level wireless LAN interface. Therefore, the size and cost of the device can be reduced.

Embodiment 2. FIG.
FIG. 6 is an explanatory diagram illustrating a configuration of the wireless relay device 100 according to the second embodiment (second embodiment). The radio relay apparatus 200 illustrated in FIG. 1 is an apparatus that performs one-to-one communication between an upper radio interface and a WiMAX base station. However, the radio relay apparatus 100 illustrated in FIG. 6 is limited to the number of upper radio interfaces. No, it supports multiple types of wide area wireless communication standards. The plural types of wide area wireless communication standards are, for example, WiMAX, WCDMA, CDMA, LTA, and the like. Note that the configuration and operation of the present embodiment are the same as those of the first embodiment, unless particularly described.

  The wireless relay device 100 according to the present embodiment includes a lower wireless interface unit 101, an upper wireless interface unit 102, a wireless LAN environment measuring unit 103, and a relay processing device 104. The upper wireless interface unit 102 includes a plurality of communication interfaces (MS1) 102a to communication interfaces (MSn) 102n, each corresponding to different types of wide area wireless communication standards. The communication interface (MS1) 102a to the communication interface (MSn) 102n communicate with the base station (BS1) 4021 to the base station (BSn) 402n.

  In the wireless relay device 100 shown in FIG. 6, the lower wireless interface unit 101 has the same function as the lower wireless interface unit 201, and the wireless LAN environment measurement unit 103 is the same as the wireless LAN environment measurement unit 203. It has the function of In FIG. 6, the wireless LAN slave device (STA2) 301, the wireless LAN master device (AP2) 401, and the Internet network 501 are the same as those shown in FIG.

  The relay processing device 104 of the wireless relay device 100 in FIG. 6 can switch the communication interface to be connected. For example, as in the example illustrated in FIG. 5, the relay processing device 104 sets a priority, a connectable level, and a disconnectable level in advance for each of the base station (BS1) 4021 to the base station (BSn) 402n. By doing so, it is possible to automatically switch to a base station for wide-area wireless communication that can be connected and has a high priority.

  According to the wireless relay device 100 of the present embodiment, since it corresponds to a plurality of types of wide area wireless communication, for example, when moving, it is automatically switched to a wide area wireless communication base station having a high radio field intensity, thereby The connectivity to can be further improved.

  Moreover, in said embodiment, the radio relay apparatus as shown to the following (1)-(3) is also disclosed.

(1) An upper wireless interface unit (for example, upper wireless interface unit 202) having a communication interface for communicating with an upper base station (for example, WiMAX base station (BS1) 402), and a wireless LAN slave device (for example, a wireless LAN child) Lower wireless interface unit (for example, lower wireless interface unit 201) that communicates with the wireless communication device (STA2) 301), and wireless LAN environment measuring unit (for example, wireless LAN environment measuring unit that measures the radio wave condition for an external wireless LAN base unit) 203) and the lower radio interface and the upper radio interface unit, the radio wave intensity of the upper radio interface unit with respect to the base station is below a predetermined disconnectable level, and an external wireless LAN Connection is possible with a predetermined radio wave intensity for the main unit If it is level or higher, a radio relay apparatus having a relay processing unit for stopping the transfer process (e.g., the relay processing unit 204) and (e.g., the wireless relay device 200).

(2) An upper wireless interface unit having a communication interface that communicates with an upper base station, a lower wireless interface unit that communicates with a wireless LAN slave device and measures a radio wave condition with respect to an external wireless LAN master device, and a lower wireless interface Data transmission processing between the mobile station and the higher-order wireless interface unit, and the strength of the radio wave of the higher-level wireless interface unit with respect to the base station is below a predetermined disconnectable level, May be configured to include a relay processing device that stops the transfer processing when it is equal to or higher than a predetermined connectable level. According to such a wireless relay device, the device can be saved in space.

(3) In the wireless relay device, the upper wireless interface unit (for example, the upper wireless interface unit 102) includes a plurality of communication interfaces (for example, communication interface (MS1) 202a to communication interface (MSn) corresponding to different wide area wireless communication standards. 202n), and the relay processing device (for example, the relay processing device 104) may be configured to switch the communication interface to be connected. According to such a wireless relay device, for example, when moving, the connectivity to the higher level network can be further improved by automatically switching to a base station for wide area wireless communication with high radio field intensity.

  The present invention can be applied to a wireless relay device (mobile router) that connects a wireless LAN slave unit to the Internet using wide area wireless communication.

100, 200 Wireless relay device 101, 201 Lower wireless interface unit 102, 202 Upper wireless interface unit 103, 203 Wireless LAN environment measuring unit 104, 204 Relay processing device 301 Wireless LAN slave device 401 Wireless LAN master device 402 WiMAX base station 501 Internet network

Claims (5)

An upper wireless interface unit having a communication interface for communicating with an upper base station;
A lower-layer wireless interface unit communicating with the wireless LAN slave device;
A wireless LAN environment measuring unit for measuring a radio wave condition for an external wireless LAN base unit;
Data transfer processing is performed between the lower radio interface and the upper radio interface unit, and the radio wave intensity of the upper radio interface unit with respect to the base station is less than a predetermined disconnectable level, and the external radio interface A relay processing device for stopping the transfer process when the strength of the radio wave with respect to the LAN base unit is equal to or higher than a predetermined connectable level ;
The wireless relay device, wherein the disconnectable level and the connectable level are the same level and have a predetermined range of width . An upper wireless interface unit having a communication interface for communicating with an upper base station;
A low-order wireless interface unit that communicates with a wireless LAN slave device and measures a wireless radio wave condition for an external wireless LAN master device;
Data transfer processing is performed between the lower radio interface and the upper radio interface unit, and the radio wave intensity of the upper radio interface unit with respect to the base station is less than a predetermined disconnectable level, and the external radio interface A relay processing device for stopping the transfer process when the strength of the radio wave with respect to the LAN base unit is equal to or higher than a predetermined connectable level ;
The wireless relay device, wherein the disconnectable level and the connectable level are the same level and have a predetermined range of width . The upper wireless interface unit includes a plurality of communication interfaces corresponding to different wide area wireless communication standards,
The wireless relay device according to claim 1, wherein the relay processing device switches the communication interface to be connected. Communicate with the upper base station,
Communicate with wireless LAN handset,
Measure the radio wave condition for the external wireless LAN base unit,
Data transfer processing is performed between the base station and the wireless LAN slave unit, and the strength of the radio wave with respect to the base station is not more than a disconnectable level having a predetermined range width , and the external wireless LAN parent The wireless relay method, wherein the transfer process is stopped when the intensity of the radio wave with respect to the machine is equal to or higher than the disconnectable level and is equal to or higher than a predetermined connectable level having a width of the predetermined range . On the computer,
An upper wireless communication process for communicating with an upper base station;
A lower-layer wireless communication process for communicating with the wireless LAN slave unit;
A wireless LAN environment measurement process for measuring a radio wave condition for an external wireless LAN base unit;
Data transfer processing is performed between the base station and the wireless LAN slave unit, and the strength of the radio wave with respect to the base station is not more than a disconnectable level having a predetermined range width , and the external wireless LAN parent A wireless process for executing the relay process for stopping the transfer process when the intensity of the radio wave to the machine is equal to or higher than the disconnectable level and a predetermined connectable level having the predetermined range width Relay program.

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