JP2007251564A - Wireless lan system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress consumption power of an access point further when there is no operating terminal in a service area in charge of the access point, and make malfunction not to occur in power save control. <P>SOLUTION: When the terminal 14 is not connected to a wireless LAN, all functions of a first and a second wireless LAN devices 10, 12 and a second wireless device 20 stop (a power supply off-state or a power saving mode). A function of a first wireless device 18 operates, and a narrow band beacon is transmitted from the first wireless device in a constant interval. Further, the second wireless device turns on if there is a network connection request from the terminal 14, the first wireless device turns on the second wireless LAN device if it confirms that the second wireless device turns on, and the second wireless LAN device turns on by turning on of the first wireless LAN device. By the method, network communication by the wireless LAN between the second wireless LAN device and the first wireless LAN device starts, and the terminal can communicate with a wire LAN network through the wireless LAN. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadband wireless communication apparatus [wireless LAN (Local Area Network)] network, and more particularly to an access point in a network that operates in an infrastructure mode and has a plurality of access points in a narrow area on the same channel. The present invention relates to a wireless LAN system that enables power saving and effective use of a wireless band.

  Wireless LAN technology is one of the effective means for forming a computer network. The use of wireless LAN technology increases the degree of freedom of arrangement of terminals (PC: personal computer, etc.) connected to the LAN. Furthermore, depending on the operation, the wireless LAN technology can provide an environment in which an unspecified number of terminals are connected to another network such as a server or the Internet. Due to these advantages, wireless LAN technology has been spreading in recent years.

  In the wireless LAN technology, a wireless LAN access point (master station), a wireless LAN card (slave station), and the like are used. A wireless LAN card is connected to a terminal using the wireless LAN. A terminal to which a wireless LAN card is connected can access the LAN via a wireless LAN access point.

  Conventionally, IEEE802.11a / b / g is generally known as a protocol for communication between a wireless LAN access point (master station) and a wireless LAN card (slave station). IEEE802.11a / b / g is a wireless LAN standard established by the IEEE (American Institute of Electrical and Electronics Engineers) 802 committee. For example, in IEEE802.11b, it is about 2.4 GHz band (ISM band). It is a specification capable of communicating with a terminal located at a distance of 50 to 100 m from an access point at a speed of 11 Mbps. The wireless LAN access point (master station) and the wireless LAN card (slave station) communicate with each other according to a protocol defined in IEEE 802.11a / b / g.

  Due to frequency resource restrictions, wireless LAN technology communication, that is, communication according to the protocol defined in IEEE802.11a / b / g has a feature (restriction) that many channels cannot be used. .

  FIG. 9 is a diagram showing an example of a conventional wireless LAN system compliant with IEEE802.11b.

  The wireless LAN system shown in FIG. 9 is a wireless LAN (for example, IEEE802.11b compliant) network system using a broadband wireless device capable of wireless high-speed data communication that operates in an infrastructure mode, and includes a broadband wireless LAN device 150 and a router 106. And a wired LAN network 108. Further, the broadband wireless LAN device 150 includes a wireless LAN device 100 constituting a wireless LAN access point (AP) as a master station, a wireless LAN device 102 constituting a wireless LAN card as a slave station, and a personal computer. The terminal 104 is configured.

  The wireless LAN device 100 is connected to the wired LAN network 108 via the router 106, and the wireless LAN device 102 is connected to the terminal 104 by wire. In FIG. 9, for the sake of simplicity, only one master station (wireless LAN device 100) and slave station (wireless LAN device 102) are configured. However, in an actual wireless LAN system, a small cell called a cell is used. By a set of areas (service areas of access points), it is composed of a plurality of master stations (AP) that provide a wide service domain and a plurality of slave stations (wireless LAN cards, etc.) accommodated in each master station (hereinafter referred to as “access point service areas”). The same applies to the explanation of).

  The power saving control in this wireless LAN system is performed when there is no data to be transmitted (wireless transmission) between the wireless LAN device 100 as a master station and the wireless LAN device 102 as a slave station as shown in FIG. The wireless LAN device 102 is controlled by performing power saving control (a state where neither reception nor transmission is possible: a sleep state). This will be specifically described below.

  In order to maintain the connection with the wireless LAN device 102, the wireless LAN device 100 serving as an access point includes, in a control frame called a beacon, the presence / absence of transmission data to the terminal 104, the sleep time, and the next Transmit information such as beacon transmission time. The wireless LAN device 102 receives (refers to) this beacon (control frame), and transmits to the wireless LAN device 100 when there is no data addressed to the beacon (when there is no data to be received). When there is no data to be transmitted, the state shifts to a state in which no radio is used (Sleep state) until the next scheduled beacon time. Thus, power saving control in the wireless LAN system is performed by suppressing power consumption of the wireless LAN device 102.

  However, in the power saving control method of the wireless LAN system, the power consumption of the wireless LAN device 102 can be suppressed, but the wireless LAN device 100 transmits a beacon at regular time intervals in order to maintain the connection with the wireless LAN device 102. There is a problem that power consumption cannot be suppressed because it is necessary to receive transfer data from the wireless LAN device 102, and it is necessary to always be in a reception standby state except during data transmission. It was.

There exists a thing of patent document 1 as a technique for solving this problem. This is because the access point (equivalent to the wireless LAN device 100) is divided into a reception level detection comparison block, a transmission block, and other blocks, and there is no communication with the terminal (equivalent to the wireless LAN device 102) for a certain period of time. In this case, power is supplied only to the reception level detection comparison block (Sleep state), and when reception power of a predetermined level or higher is detected in the reception level detection comparison block, it is determined that communication with the terminal has started, and transmission is performed. Power is supplied to the block and other blocks so that the entire access point operates (Active state), thereby reducing the power consumption of the access point when the terminal is not operating (power saving) Control).
JP 2001-156788 A (paragraphs 32 to 38, etc.)

  However, with the technique described in Patent Document 1, although transmission of beacons (control frames) at regular time intervals can be suppressed, the access point is still in a reception standby state, and power consumption for that point cannot be suppressed. The problem remains. In addition, since the access point sees only the reception level (reception power) of the radio wave, the transition from the sleep state to the active state is erroneously caused by the radio wave (carrier wave) or noise from the radio wave source near the access point. There was a problem that it may be performed (malfunction).

  The present invention has been made in view of the above problems, and its purpose is to further reduce the power consumption of the access point when there is no operating terminal in the service area of the access point. Another object of the present invention is to provide a wireless LAN system that does not cause malfunction in power saving control.

In order to achieve the above object, according to the wireless LAN system of the first aspect of the present invention,
Broadband wireless LAN including a first wireless LAN device, a second wireless LAN device connected to the first wireless LAN device via a wireless LAN, and a terminal connected to the second wireless LAN device via a wire In a wireless LAN system that operates in an infrastructure mode and has a first wireless LAN device connected to an external wired LAN, the first wireless LAN device is connected between the first wireless LAN device and the terminal in a wired manner. A band wireless device is provided. The narrowband wireless device includes a first wireless device connected to the first wireless LAN device by wire, a second wireless device connected to the first wireless device wirelessly, and connected to the terminal by wire. Including wireless devices. Further, the narrowband wireless device controls the power supply control means of the first wireless LAN device according to an instruction from the terminal and controls the power ON / OFF.

  In the present invention, it is preferable that the first wireless LAN device, the second wireless LAN device, and the second wireless device are configured so that the power is turned on only while the terminal is using the LAN network. .

  Further, in the present invention, the first wireless device has ID identifying means for presetting the ID of the second wireless device inside or outside, and the second wireless device having the set ID. It is preferable that the first wireless LAN device is turned on only when the wireless device is turned on.

  According to the present invention, since the power of the first wireless LAN device is turned on only while the terminal is in use of the network, the power consumption of the first wireless LAN device (access point) can be suppressed.

  Further, according to the present invention, the first wireless LAN device, the second wireless LAN device, the first wireless device, and the second wireless device are connected only when the first wireless device and the second wireless device are wirelessly connected. Since all the wireless devices are in the ON state (wireless LAN network usable state), a terminal (second wireless device) operating in the service area of the access point (first wireless LAN device) When there is no wireless LAN system, it is possible to further reduce the power consumption of the access point and to prevent malfunction in power saving control.

  Further, according to the present invention, the first wireless device has ID identifying means for presetting the ID of the second wireless device inside or outside thereof, and the second wireless device having the set ID. Since the wireless LAN connection is started by turning on the first wireless LAN device only when the device is turned on, only the authorized terminal can be permitted to access the wired LAN network. I can do it.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawing, each component is merely schematically shown to the extent that the present invention can be understood. The conditions described below are merely preferred examples within the scope of the present invention.

(Embodiment)
1 to 6 are diagrams for explaining an embodiment of the present invention. First, the configuration will be described, and then the operation will be described.

[Configuration of Embodiment]
FIG. 1 is a diagram showing a configuration example of a wireless LAN system according to the present invention.

  The wireless LAN system in FIG. 1 includes a broadband wireless LAN device 50 that performs wireless communication according to a protocol that conforms to IEEE802.11b, and a narrowband wireless that performs wireless communication according to a protocol that conforms to IEEE802.5.4 that has low power consumption. The LAN device 52, the router 16, and the wired LAN network 34 are configured.

  Here, the frequency spectrum of IEEE802.11b with a wide band and IEEE802.5.4 with low power consumption in a narrow band [waveform when a carrier (carrier wave) carrying information (transmission data) is viewed from the frequency axis] is shown in FIG. Shown in IEEE802.5.4 has lower power consumption than IEEE802.11b, but has a narrow bandwidth and a low transfer speed and a weak transmission power, so the communication distance is short. In Japan, the frequency of 2.4 GHz band (ISM band) is used, and 16 channels can be used in IEEE802.15.4, and 3 channels can be used in IEEE802.11b. It should be noted that there is a plurality of adjacent access points, and interference occurs in a carrier wave transmitted from the access point, that is, a channel where a spectrum collides.

  The broadband wireless LAN device 50 includes a first wireless LAN device, that is, a wireless LAN device 10, and a second wireless LAN device, that is, a wireless LAN device 12 that includes a wireless LAN card connected to the wireless LAN device 10 through a wireless LAN. The terminal 14 is composed of a personal computer or the like. Further, the narrow-band wireless LAN device 52 includes a first wireless device, that is, the wireless device 18, and a second wireless device, that is, a wireless device 20 that includes a wireless adapter that is wirelessly connected to the wireless device 18.

  As described above, in FIG. 1, only one master station (wireless LAN device 10) and slave station (wireless LAN device 12), and only one wireless device 18 and wireless device 20 are shown for ease of explanation. However, in an actual wireless LAN system, a plurality of master stations (AP) that provide a wide service domain by a set of small areas called cells (this area is called an access point service area) It is composed of a plurality of slave stations (for example, a wireless LAN card and a wireless adapter) accommodated in the master station.

  On the other hand, as shown in FIG. 3, the wireless LAN device 10 is provided with a power supply circuit that controls ON / OFF (on or off) of the power supply of the wireless LAN device 10, that is, power saving control. In FIG. 3A, the power supply control (enable / disable) signal α supplied from the wireless device 18 is used to directly control the power supply circuit for the wireless LAN device 10 from the outside (wireless device 18). The power supply ON / OFF control of the wireless LAN device 10 is performed by the power supply circuit 22 for the wireless LAN device 10.

  In FIG. 3B, the terminal 14 status notification β is supplied from the wireless device 18 to the internal control device 24 such as an MPU in the wireless LAN device 10, and the internal control device 24 is based on the terminal 14 status notification β. The wireless LAN device 10 performs power ON / OFF control, and then determines the wireless LAN device 10 state, that is, the power ON / OFF state, as the wireless LAN device 10 state response γ. The configuration returned to 18 is shown. In this embodiment, description will be made according to the configuration of FIG. Further, the power ON / OFF control of the wireless LAN device 10 is not limited to the above two methods. The power supply circuit 22 for the wireless LAN device 10 and the internal control device 24 are collectively referred to as power supply control means.

  Here, the internal control device 24 of the wireless LAN device 10 is configured by a microcomputer (MPU or the like). Therefore, it includes a CPU (Central Processing Unit), a memory, an input / output device, and other necessary components. Here, the memory in the CPU and the memory outside the CPU, if any, are collectively referred to as a memory unit. The processing related to writing and reading of information to the memory unit itself and the processing related to each component (functional block) are well-known matters in a control device using a microcomputer. The detailed explanation is omitted.

[Operation of Embodiment]
Next, the operation of the wireless LAN system of the present invention will be described with reference to FIGS. 4 to 6 are sequence diagrams for explaining the operation of the present invention.

<Establishment of wireless LAN network communication>
The establishment of wireless LAN network communication will be described with reference to FIG.

  First, when the terminal 14 is not connected to the wireless LAN, the functions of the wireless LAN devices 10 and 12 and the wireless device 20 are all stopped and are in a power-off state or a power saving mode. On the other hand, the function of the wireless device 18 is operating, and a narrowband beacon is transmitted from the wireless device 18 at regular intervals.

  The terminal 14 outputs a “startup” signal to the wireless device 20 when it is desired to validate the LAN network. The wireless device 20 to which the “startup” signal is supplied transitions from the power OFF state (network disconnected) to the power ON state (network connected) and initiates a wireless connection with the wireless device 18. Transmit to the wireless device 18. The wireless device 18 that has received the “connection request” from the wireless device 20 notifies the internal control device 24 of the wireless LAN device 10 of “terminal 14 status notification (in this case, notification that the terminal 14 wants to activate the network)”. ”And“ 802.15.4 connection permission ”signal is transmitted to the wireless device 20.

  The internal control device 24 of the wireless LAN device 10 to which the “terminal 14 status notification” is supplied from the wireless device 18 changes the wireless LAN device 10 from the power-off state to the power-on state, that is, the wireless LAN is turned on. 18 outputs a “wireless LAN device 10 status response (in this case, a notification that the wireless LAN has been turned on)”. The wireless device 18 supplied with the “wireless LAN device 10 status response” transmits a “wireless LAN device 10 status notification” to the wireless device 20.

  The wireless device 20 that has received the “wireless LAN device 10 status notification” outputs a “notification” signal to that effect to the terminal 14, and the terminal 14 outputs an “activation” signal to the wireless LAN device 12. . The wireless LAN device 12 that has received the “activation” signal from the terminal 14 transitions from the power OFF state to the power ON state, and starts communication with the wireless LAN device 10. As a result, network communication between the wireless LAN device 12 and the wireless LAN device 10 is started, and the terminal 14 can perform network communication (connect to a wired LAN network is possible).

<End of wireless LAN network communication>
For example, there are two methods for terminating the wireless LAN network communication. That is, (1) when the wireless LAN network communication termination process is performed on the access point side and the terminal side, respectively, and (2) when the wireless LAN network communication is terminated by exchanging data between the access point side and the terminal side. Each will be described below.

  (1) When the termination process of wireless LAN network communication is performed on each of the access point side and the terminal side.

  With reference to FIG. 5, a case will be described in which wireless LAN network communication termination processing is performed on each of the access point side and the terminal side.

  First, when the terminal 14 stops the wireless LAN network communication or the wireless LAN network communication is disconnected by moving the service area of the access point or the like, the terminal 14 detects the disconnection, that is, the disconnection to the network. In this case, the terminal 14 outputs a “disconnect” signal to the wireless LAN device 12 and the wireless device 20. As a result, the wireless LAN device 12 and the wireless device 20 transition from the ON state (connected) to the OFF state (disconnected).

  On the other hand, the wireless device 18 confirms the connected wireless device (in this case, the wireless device 20) at regular intervals, and always confirms the presence of the connected wireless device 20. In this state, when the connected wireless device 20 cannot confirm (presence of absence) for a predetermined period of time or longer, it detects the “terminal 14 status notification (this is detected)” to the internal control device 24 of the wireless LAN device 10. In this case, a notification indicating the absence of the wireless device 20) is output. In response to this, the internal control device 24 of the wireless LAN device 10 returns a “wireless LAN device 10 status response (in this case, a notification that the wireless LAN has been turned off)” to the wireless device 18 and wirelessly. Transition from the LAN ON state to the wireless LAN OFF state.

  As a result, the wireless LAN system is in an initial state, that is, all the functions of the wireless LAN devices 10 and 12 and the wireless device 20 are stopped (power OFF state or power saving mode), and only the function of the wireless device 18 is operating. It becomes a state.

  (2) When the access point side and the terminal side exchange data to end wireless LAN network communication.

  Next, the case where the access point side and the terminal side exchange data and end the wireless LAN network communication will be described with reference to FIG.

  First, when the terminal 14 stops the wireless LAN network communication, the terminal 14 outputs a “disconnect” notification to the wireless device 20. As a result, the wireless device 20 transmits a “disconnect request” to the wireless device 18. The wireless device 18 that has received the “disconnect request” transmits a “disconnect acceptance” response to the wireless device 20 and also notifies the internal control device 24 of the wireless LAN device 10 of the “terminal 14 status notification (in this case, the terminal 14 outputs a notification to stop wireless LAN network communication). The internal control device 24 of the wireless LAN device 10 that has received the “terminal 14 status notification” sends a “wireless LAN device 10 status response to the wireless device 18 (in this case, a notification that the wireless LAN device 10 has been turned off). ”And a transition from the wireless LAN ON state to the wireless LAN OFF state.

  On the other hand, the wireless device 18 that has received the “wireless LAN device 10 status response” from the internal control device 24 of the wireless LAN device 10 transmits a “wireless LAN device 10 status notification” to the wireless device 20. The wireless device 20 that has received the “wireless LAN device 10 status notification” outputs “notification (in this case, notification that the wireless LAN device 10 has been turned off)” to the terminal 14 and is also in the ON state (connection The state is changed from the middle state to the OFF state (disconnecting). The terminal 14 that has received “notification” from the wireless device 20 outputs a “stop” request to the wireless LAN device 12. The wireless LAN device 12 that has received the “stop” request from the terminal 14 changes the state from the ON state (connected) to the OFF state (disconnected).

  As a result, the wireless LAN system is in an initial state, that is, all the functions of the wireless LAN devices 10 and 12 and the wireless device 20 are stopped (power OFF state or power saving mode), and only the function of the wireless device 18 is operating. It becomes a state.

[Effects of Embodiment]
Therefore, according to this embodiment, when the terminal 14 does not communicate with the wired LAN network via the wireless LAN (state), or when the wireless device 18 and the wireless device 20 cannot be connected, the wireless communication is performed. The functions of the LAN devices 10 and 12 and the wireless device 20 can all be stopped, and the power consumption of the entire wireless LAN system can be suppressed. At this time, the wireless device 18 is in an operating state, but since the wireless device 18 is a narrowband wireless device (IEEE802.5.4, etc.), the wireless LAN device 10 (broadband wireless device: IEEE802.11b, etc.) is used. Although the transmission power and the transmission rate are inferior to each other, the power consumption can be greatly suppressed.

  In addition, as shown in FIG. 7, when there are a plurality of access points similar to those of the wireless LAN device 10, conventionally, there is no terminal 14 that accommodates the connected wireless LAN device 12 in the service area. Since the beacon is transmitted, the band is instantaneously used. However, in this embodiment, since the beacon is not transmitted from the wireless LAN device 10 (the access point does not operate at all), the wireless band is used. Is not wasted.

  Furthermore, since the start and end of network communication of the terminal 14 is performed by the narrowband wireless device 52, no malfunction occurs in the power saving control.

(Modification of embodiment)
In this embodiment, an IEEE802.11b-compliant wireless device has been described as an example of a broadband wireless LAN device. However, IEEE802.11a, g, another broadband wireless communication device, IEEE802.11a / b / g, and other broadband The present invention can also be applied to a composite device of a wireless communication device.

  In this embodiment, IEEE 802.15.4 has been described as an example of the narrowband wireless device (control wireless communication connection method), but ZigBee (can be driven for about two years with two alkaline AA batteries) It is also possible to apply a low-bandwidth narrowband radio system such as BlueTooth, weak radio, and specific low power radio. However, when a wireless device having a larger connection area than a wireless LAN (broadband wireless LAN device) is adopted, a means (circuit or the like) for reducing the transmission power or calculating the wireless LAN connection possible range from the received power is wideband. It is necessary to enable operation by being incorporated in a wireless LAN device.

  Further, by providing a function for presetting (storing) an individual ID of the wireless device 20 that can be connected to the wireless device 18 inside or outside of the wireless device 18 in this embodiment, the wireless device 20 (terminal 14) It can be used as a connection key to the wireless LAN device 10. A specific example will be briefly described below with reference to FIG.

  The wireless device 18 includes a microcomputer, that is, a CPU 36 therein. The CPU 36 includes a control unit 26, a storage unit 30, and a calculation unit 32. The calculation unit 32 of the CPU 36 functions as a function unit of each unit by executing a program. Here, there is an ID identifying means 28 as the function means. In the storage unit 30, the individual ID of the wireless device 20 permitted to connect to the wired LAN network 34 in advance is stored in advance as a reference data so that it can be read out. On the other hand, the wireless device 20 transmits information with a unique ID for each wireless device 20.

  That is, when the wireless device 18 receives the “connection request” (including the individual ID of the wireless device 20) transmitted from the wireless device 20, the ID identification unit 28 responds to this reception from the storage unit 30 individually. The ID is read as a reference ID, and the individual ID attached to the “connection request” signal is compared with the reference ID. When it is determined that the received individual ID of the wireless device 20 and the reference ID stored in the storage unit 30 match, the above-described implementation is performed in response to a command from the control unit 26 in response to this determination. The wireless device 18 is caused to execute the operation according to the form. On the other hand, when it is determined by this collation that the individual ID and the reference ID do not match, the “connection request” transmitted from the wireless device 20 is ignored according to a command from the control unit 26. The CPU 36 may be provided outside the wireless device 18.

  It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

  For example, the best configuration for carrying out the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the present invention has been illustrated and described with particular reference to particular embodiments, but may be configured with respect to the above-described embodiments without departing from the scope of the technical idea and objects of the invention. Various modifications can be made by those skilled in the art in operation, quantity, and other detailed configurations.

  Therefore, the description limited to the configuration, operation, etc. disclosed above is exemplary for easy understanding of the present invention, and does not limit the present invention. The description of the name of the configuration excluding a part or all of the limitation is included in the present invention.

It is a figure which shows the example of 1 structure of the wireless LAN system of this invention. It is the figure which showed the frequency spectrum of IEEE802.11b with a wide band, and IEEE802.15.4 with low power consumption by a narrow band. 2 is a diagram illustrating an example (configuration) of power control means for controlling ON / OFF of power of a wireless LAN device 10 (power saving control). FIG. It is a sequence diagram for demonstrating operation | movement for establishment of the wireless LAN network communication of this invention. It is a sequence diagram for demonstrating operation | movement in the case of performing the termination process of wireless LAN network communication in each of the access point side and the terminal side. It is a sequence diagram for demonstrating operation | movement when an access point side and a terminal side exchange data and complete | finish wireless LAN network communication. It is the figure which showed the wireless LAN system in case a plurality of access points exist. 2 is a diagram illustrating a configuration of a CPU 36. FIG. It is a figure which shows the example of 1 structure of the conventional wireless LAN system. It is a figure for demonstrating operation | movement of the conventional wireless LAN system.

Explanation of symbols

10 ... Wireless LAN device (first wireless LAN device, access point, etc.)
12. Wireless LAN device (second wireless LAN device, wireless LAN card, etc.)
14 ... Terminal (personal computer, etc.)
16 ... router 18 ... wireless device (first wireless device)
20 ... wireless device (second wireless device, wireless adapter, etc.)
22 ... Power supply circuit for wireless LAN device 10 24 ... Internal control device (MPU, etc.)
DESCRIPTION OF SYMBOLS 26 ... Control part 28 ... ID identification means 30 ... Memory | storage part 32 ... Operation part 34 ... Wired LAN network 36 ... CPU
50 ... Wideband wireless LAN device 52 ... Narrowband wireless LAN device

Claims (3)

Broadband wireless LAN including a first wireless LAN device, a second wireless LAN device connected to the first wireless LAN device via a wireless LAN, and a terminal connected to the second wireless LAN device via a wire A wireless LAN system that operates in an infrastructure mode, wherein the first wireless LAN device is connected to an external wired LAN.
A narrowband wireless device connected by wire between the first wireless LAN device and the terminal;
The narrowband wireless device includes a first wireless device wired to the first wireless LAN device, a second wirelessly connected to the first wireless device, and a second wirelessly connected to the terminal. Wireless devices,
The wireless LAN system according to claim 1, wherein the narrowband wireless device controls a power supply control unit of the first wireless LAN device to control ON / OFF of the power supply according to an instruction from the terminal.   2. The power supply of the first wireless LAN device, the second wireless LAN device, and the second wireless device is turned on only while the terminal is using a LAN network. Wireless LAN system.   The first wireless device has ID identifying means for presetting the ID of the second wireless device inside or outside the first wireless device, and the second wireless device having the set ID is turned on The wireless LAN system according to claim 2, wherein the first wireless LAN device is turned on only during the period.

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