JP2013247391A - Terminal device, network system, program, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to detect the movement of a terminal device which was made to sleep.SOLUTION: A terminal device 10 comprises: a sleep control unit 16 which gets the terminal device 10 into a sleep state in which a radio communication function is stopped; a movement detection unit 17 which detects the movement of the terminal device 10 in the sleep state; and an output unit 17 which outputs terminal information on the terminal device 10 when the movement detection unit 17 has detected the movement of the terminal device 10.

Description

  This case relates to a terminal device, a network system, a program, and a control method.

  In recent years, with the widespread use of multi-function mobile phones (smartphones), the usage rate of third-generation mobile communication systems (3G; 3rd Generation) lines has increased. In order to reduce such traffic on the 3G line, public WLAN (Wireless Local Area Network: Wireless LAN) networks are successively installed by companies. As a result, it is expected that an environment in which WLAN communication can be used everywhere instead of 3G communication will be established in the future.

Now, for example, in a wireless LAN, in a WPA (Wi-Fi Protected Access) communication method that has been widely used in recent years, it is necessary to always ensure a logical connection. As a result, conventionally, the WLAN function of the terminal device is forced to operate without sleeping (WLAN sleep), which hinders reduction of power consumption.
For example, if a terminal device moves from one access point communication range to another access point communication range while WLAN sleep, the key between the access point and the terminal device exceeds the communication range. There is no exchange.

In recent years, an external information processing device (external device) remotely accesses a portable terminal device or receives a push-type message transmitted from the external device in the terminal device. Has increased.
For example, in order for an external device to remotely access data to an information terminal, the terminal device transmits information (terminal information) such as an IP address and a port number to a management server or the like via an access point in advance. To do. The management server manages terminal information of each terminal device and information such as which access point the terminal device is under management of. Then, the external device that is the connection source inquires the management server about various information necessary for accessing the terminal device, and performs data access to the terminal device based on the terminal information acquired by the response, Send push messages.

JP 2010-136033 A

However, in such a conventional network system, if WLAN sleep is performed in order to reduce power consumption of the terminal device, the terminal device cannot transmit terminal information to the management server.
As a result, when the terminal device in the WLAN sleep state is moved from the communication range of one access point to the communication range of another access point, the management server cannot detect that the terminal device has moved, and the terminal device The position of can not be grasped. Accordingly, there is a problem that the terminal device cannot be accessed from the external device.

Here, it is conceivable to release the WLAN sleep by periodically starting the terminal device independently and to notify the access point periodically of the terminal information.
However, after the WLAN sleep is canceled and the terminal information is transmitted first, the management server cannot acquire the terminal information of the terminal device until a predetermined time elapses, so that the convenience is low. Thus, it is conceivable to shorten the interval at which the terminal device is activated independently, but this also increases the number of times that the terminal device is activated independently, resulting in increased power consumption.

In one aspect, an object of the present invention is to make it possible to detect the movement of a terminal device that has been put to sleep.
In addition, the present invention is not limited to the above-described object, and other effects of the present invention can be achieved by the functions and effects derived from the respective configurations shown in the embodiments for carrying out the invention which will be described later. Can be positioned as one of

  For this reason, this terminal device is a terminal device having a wireless communication function for performing wireless communication with the relay device, and a sleep control unit for setting the sleep state in which the wireless communication function is stopped; and the terminal device in the sleep state A movement detection unit that detects the movement of the terminal device, and an output unit that outputs the terminal information of the terminal device when the movement detection unit detects the movement of the terminal device.

  The network system includes a relay device and a terminal device having a wireless communication function for performing wireless communication with the relay device, and a sleep control unit that sets a sleep state in which the wireless communication function is stopped And a movement detection unit that detects movement of the terminal device in the sleep state and an output unit that outputs terminal information of the terminal device when the movement detection unit detects movement of the terminal device.

  According to one embodiment, it is possible to detect movement of a terminal device that has been put to sleep.

It is a figure which shows the structure of the network system as an example of 1st Embodiment. It is a figure which shows the function structure of the radio | wireless terminal apparatus of the network system as an example of 1st Embodiment. It is a figure which illustrates the sleep start time setting data table in the network system as an example of 1st Embodiment. It is a figure which illustrates the acceleration sensor interval setting data table in the network system as an example of 1st Embodiment. It is a figure explaining the outline | summary of the process at the time of the sleep of a radio | wireless terminal apparatus in the network system as an example of 1st Embodiment. It is a flowchart explaining the WLAN sleep control method in the network system as an example of the first embodiment. It is a flowchart explaining the power supply control method of the acceleration sensor module in the network system as an example of 1st Embodiment. It is a figure which shows the function structure of the radio | wireless terminal apparatus of the network system as an example of 2nd Embodiment. It is a figure which illustrates the WLAN key update time extension request information in the network system as an example of 2nd Embodiment. It is a figure which shows the function structure of the access point of the network system as an example of 2nd Embodiment. It is a figure which illustrates the WLAN key update time extension request information memorize | stored in the WLAN key update time extension request information buffer in the network system as an example of 2nd Embodiment. It is a flowchart explaining the WLAN sleep control method in the network system as an example of 2nd Embodiment. It is a flowchart explaining the extension determination process of the WLAN key update time in the access point of the network system as an example of the second embodiment.

  Hereinafter, embodiments of the present terminal device, network system, program, and control method will be described with reference to the drawings. However, the embodiment described below is merely an example, and there is no intention to exclude application of various modifications and techniques not explicitly described in the embodiment. That is, the present embodiment can be implemented with various modifications without departing from the spirit of the present embodiment. Each figure is not intended to include only the components shown in the figure, and may include other functions.

(A) Description of First Embodiment FIG. 1 is a diagram illustrating a configuration of a network system 1 as an example of the first embodiment, and FIG. 2 is a diagram illustrating a functional configuration of the wireless terminal device 10.
As shown in FIG. 1, the network system 1 includes a management server 2, a wireless terminal device 10, an access device 4, and a plurality of (two in the example shown in FIG. 1) access points 3-1 and 3-2. .

The management server 2, the access device 4, and the access points 3-1 and 3-2 are communicably connected via the network 50. The network 50 is a communication line such as a LAN.
The access points 3-1 and 3-2 are wireless LAN access points, and the wireless terminal 10, which will be described later, performs wireless communication with one of these access points 3-1 and 3-2. 10 is communicably connected to the network 50.

The access points 3-1 and 3-2 have the same configuration. Hereinafter, as a code indicating an access point, codes 3-1 and 3-2 are used when it is necessary to specify one of a plurality of access points, but code 3 is used when indicating an arbitrary access point.
For example, the access point 3 establishes wireless communication in accordance with a standard defined in WiFi (registered trademark) or the like. The function as the access point 3 can be realized by using various known methods, and detailed description thereof is omitted.

The wireless terminal device 10 can communicate with the access point 3 within the reach (communication range, coverage) of the radio wave output from the access point 3.
Further, the access point 3 has a function of changing (updating) a WLAN key that is an encryption key used for wireless communication with the wireless terminal device 10, and changes the WLAN key every predetermined time (WLAN key update time). The access point 3 stores the WLAN key update time in a storage device (WLAN key update time storage unit) such as a memory, and notifies the wireless terminal device 10 within the communication range.

  The management server 2 is a computer having a server function, and manages the wireless terminal device 10 in the network system 1. Specifically, the communication range of which access point 3 the wireless terminal device 10 is within is grasped, and the terminal information of the wireless terminal device 10 is managed. The terminal information is information related to the wireless terminal device 10 and includes network information such as an IP address and a port number necessary for an external device (access device 4) to perform data access via the network 50.

  In response to the inquiry from the access device 4, the management server 2 notifies information used for the access device 4 to access the access target wireless terminal device 10. For example, the management server 2 notifies the access device 4 of the terminal information of the wireless terminal device 10 together with the service set identifier (SSID) of the access point in which the wireless terminal device 10 is in the communication range.

The access device 4 is an external device (computer) that performs remote processing on the wireless terminal device 10 via the network 50. For example, the access device 4 performs data access and push message transmission to the wireless terminal device 10.
The access device 4 confirms (requests) the location information (terminal information) of the access destination wireless terminal device 10 from the management server 2, and sends the request to the wireless terminal device 10 based on the terminal information received from the management server 2. Perform data access.

Further, when the wireless terminal device 10 is in the sleep state, the access device 4 transmits a command (terminal Wake command) for canceling the sleep state before performing data access. As a result, the sleep state of the wireless terminal device 10 is canceled, and the access device 4 can be remotely processed.
Note that such remote processing to the wireless terminal device 10 by the access device 4 and transmission / reception of the terminal Wake command can be realized by using various known methods, and detailed description thereof will be omitted.

The wireless terminal device 10 is a computer (information processing device) that can be carried by the user, and is connected to the network 50 by wireless communication with the access point 3.
As shown in FIG. 1, the wireless terminal device 10 includes a WLAN module 11, an acceleration sensor 12, a central processing unit (CPU) 15, a random access memory (RAM) 13, and a read only memory (ROM) 14.

  The WLAN module 11 is a functional module for performing wireless communication with the access point 3. For example, the WLAN module 11 has a function of receiving a radio wave and extracting a signal, or transmitting a signal as a radio wave. Such a wireless communication function as the WLAN module 11 can be realized by various known methods, and detailed description thereof is omitted.

Further, as shown in FIG. 2, the WLAN module 11 has functions as an AP connection information acquisition unit 111, a radio wave intensity acquisition unit 112, a terminal information transmission unit 113, and a power supply control unit 114.
The AP connection information acquisition unit 111 acquires information on the access point 3 from the access point 3 when performing wireless communication with the access point 3. For example, the AP connection information acquisition unit 111 acquires the WLAN key update time from the access point 3. The WLAN key update time received by the AP connection information acquisition unit 111 from the access point 3 is notified to the WLAN sleep control unit 16 described later.

  The radio wave intensity acquisition unit 112 measures the intensity (radio wave intensity) of the received radio wave from the access point 3 when performing wireless communication with the access point 3. In the present embodiment, the radio wave intensity acquisition unit 112 outputs the measured radio wave intensity as a received signal strength indicator (RSSI) value. Note that the measurement of the radio field intensity and the calculation of the RSSI value can be realized by a known method, and detailed description thereof is omitted. The RSSI value acquired by the radio wave intensity acquisition unit 112 is notified to the WLAN sleep control unit 16.

  The terminal information transmission unit 113 transmits the terminal information of the wireless terminal device 10 to the access point 3 when performing wireless communication with the access point 3. For example, the terminal information transmission unit 113 notifies the access point 3 of terminal information (IP address and port number information) of the wireless terminal device 10. These IP addresses and port number information are notified from the WLAN control unit 16.

When the WLAN module 11 of the wireless terminal device 10 moves from the communication range of one access point 3 to the communication range of another access point 3 while the WLAN module 11 of the wireless terminal device 10 is in an active state, the terminal information transmission unit 113 Terminal information is transmitted to.
The power controller 114 controls power supply in the WLAN module 11. Specifically, the power supply control unit 114 shifts the WLAN module 11 to the sleep state by cutting off the power supply to the WLAN module 11, or enters the active state by supplying power to the WLAN module 11. Transition.

When the WLAN module 11 enters the sleep state, power consumption is reduced instead of being in a state in which WLAN communication with the access point 3 is impossible.
Hereinafter, when the WLAN module 11 is in the sleep state may be referred to as WLAN sleep.
Transition of the WLAN module 11 to the sleep state or transition to the active state is performed based on a sleep control signal (sleep transition instruction) or an active control signal (activation instruction) input from the WLAN sleep control unit 16.

The acceleration sensor module 12 detects the movement of the wireless terminal device 10 by measuring the acceleration. As shown in FIG. 2, the acceleration sensor module 12 includes a sensing unit 121, an acceleration sensor interval setting unit 122, and a power supply control unit 123.
The acceleration sensor interval setting unit 122 stores the acceleration sensor interval notified from the acceleration sensor control unit 17. The acceleration sensor interval is an interval (interval time) at which the sensing unit 121 described later performs sensing. The sensing unit 121 repeatedly executes acceleration measurement at every acceleration sensor interval.

The value of the acceleration sensor interval stored in the acceleration sensor interval setting unit 122 is updated by the acceleration sensor control unit 17. The acceleration sensor interval setting unit 122 is realized by a storage device such as a memory, for example.
The sensing unit 121 is a sensor that measures acceleration (acceleration fluctuation). For example, the sensing unit 121 detects movement in the x-axis direction, y-axis direction, and z-axis direction to detect movement of the wireless terminal device 10 and its movement direction. Is detected. Hereinafter, measuring the acceleration fluctuation may be expressed as simply measuring the acceleration.

The sensing unit 121 notifies the acceleration sensor control unit 17 described later as the measured acceleration as acceleration information. As the sensing unit 121, various known sensors can be used. For example, any of a mechanical type, an optical type, and a semiconductor type may be used.
The sensing unit 121 repeatedly measures acceleration every time the acceleration sensor interval setting unit 122 sets the acceleration sensor interval. That is, the sensing unit 121 periodically measures acceleration at the acceleration sensor interval interval stored in the acceleration sensor interval setting unit 122.

The sensing unit 121 measures acceleration at intervals set in the acceleration sensor interval setting unit 122 to obtain an RSSI value, and notifies the acceleration sensor control unit 17 of the calculated RSSI value as acceleration information.
The calculation of the RSSI value can be realized using various known methods, and detailed description thereof is omitted.

  The power supply control unit 123 controls power supply mainly to the sensing unit 121 of the acceleration sensor module 12. Specifically, the power supply to the sensing unit 121 is interrupted to shift to the OFF state, or the power supply to the sensing unit 121 is performed to shift to the ON state. ON / OFF of the sensing unit 121 is performed based on a control signal (acceleration sensor ON / OFF signal) input from the acceleration sensor control unit 17.

Hereinafter, turning on the power of the sensing unit 121 may be expressed as turning on the power of the acceleration sensor. Similarly, turning off the power of the sensing unit 121 may be expressed as turning off the power of the acceleration sensor.
By turning off the power supply of the acceleration sensor, that is, by cutting off the power supply to the sensing unit 121, the acceleration is not detected, while the power consumption is reduced.

The ROM 14 is a storage device that stores an operating system (OS) executed by the CPU 15, programs, various data, and the like.
The RAM 13 is a storage area for storing various data and programs. When the CPU 15 executes the programs, the RAM 13 stores and expands the data and programs. The RAM 13 stores a sleep start time setting data table 131, an acceleration sensor interval setting data table 132, and WLAN state information 133.

The sleep start time setting data table 131 is control information that associates the reception intensity with the time until the WLAN module 11 shifts to the sleep state.
FIG. 3 is a diagram illustrating a sleep start time setting data table 131 in the network system 1 as an example of the first embodiment. In the example illustrated in FIG. 3, the sleep start time setting data table 131 is configured by associating an RSSI value with a WLAN sleep start time.

The RSSI value is the intensity of the radio wave received from the access point 3 (radio wave intensity). The WLAN sleep start time is a time until the WLAN module 11 shifts to the sleep state, that is, a shift time to the sleep state.
In the sleep start time setting data table 131, the WLAN sleep start time is set to be longer (slower) as the RSSI value is smaller, that is, as the received signal strength is weaker.

  The WLAN sleep control unit 16 described later refers to the sleep start time setting data table 131 based on the RSSI value acquired by the radio wave intensity acquisition unit 112, and acquires the WLAN sleep start time corresponding to the RSSI value. Then, when the acquired WLAN sleep start time elapses, the WLAN sleep control unit 16 transmits a sleep control signal to the power supply control unit 114 of the WLAN module 11 to the WLAN module 11 to put the WLAN module 11 in the sleep state. .

For example, in the example illustrated in FIG. 3, when the RSSI value acquired by the radio wave intensity acquisition unit 112 is −40 dBm or more, the power supply control unit 114 of the WLAN module 11 puts the WLAN module 11 into a sleep state after 10 seconds. Transition.
The acceleration sensor interval setting data table 132 is control information that associates the reception intensity with the execution interval (interval) of acceleration measurement by the sensing unit 121 of the acceleration sensor module 12.

FIG. 4 is a diagram illustrating an acceleration sensor interval setting data table 132 in the network system 1 as an example of the first embodiment. In the example shown in FIG. 3, the acceleration sensor interval setting data table 132 is configured by associating RSSI values with acceleration sensor intervals.
The RSSI value is a radio wave intensity. The acceleration sensor interval (interval time) is an execution interval of acceleration measurement by the sensing unit 121 of the acceleration sensor module 12.

  The acceleration sensor control unit 17 to be described later refers to the acceleration sensor interval setting data table 132 based on the RSSI value acquired by the radio wave intensity acquisition unit 112 and acquires an acceleration sensor interval corresponding to the RSSI value. Then, the acceleration sensor control unit 17 sets the acquired acceleration sensor interval in the acceleration sensor interval setting unit 122 of the acceleration sensor module 12. The sensing unit 121 measures acceleration every time the acceleration sensor interval set in the acceleration sensor interval setting unit 122 elapses, and notifies the acceleration sensor control unit 17 of acceleration information.

For example, in the example shown in FIG. 4, when the RSSI value acquired by the radio wave intensity acquisition unit 112 is −40 dBm or more, the sensing unit 121 measures acceleration at intervals of 10 seconds, and displays the measured acceleration information. The acceleration sensor control unit 17 is notified.
The WLAN state information 133 is information related to the WLAN module 11, for example, the latest RSSI value acquired by the radio wave intensity acquisition unit 112 and information indicating the power supply state (ON or OFF) of the WLAN module. The WLAN sleep control unit 16 stores the RSSI value notified from the reception strength acquisition unit 112 in the RAM 13 as the WLAN state information 133. Further, the WLAN sleep control unit 16 stores the ON / OFF state of the WLAN module 11 in the RAM 13 as the WLAN state information 133 based on the active control signal or the sleep control signal output to the power supply control unit 114.

The acceleration sensor control unit 17 can refer to the WLAN state information 133. Hereinafter, referring to the WLAN state information 133 by the acceleration sensor control unit 17 may be expressed as inquiring about the WLAN state.
The CPU 15 is a processing device that performs various controls and calculations, and implements various functions by executing an OS and programs stored in the ROM 14. That is, the CPU 15 functions as a WLAN sleep control unit 16, an acceleration sensor control unit 17, and a sleep start timer 18, as shown in FIG.

  The sleep start timer 18 is a timer that measures time, and performs time according to control by the WLAN sleep control unit 16. When the sleep start timer 18 receives a sleep start time and a timing start instruction from the WLAN sleep control unit 16, the sleep start timer 18 starts timing, and notifies the WLAN sleep control unit 16 when the sleep start time has elapsed (sleep start notification). To do.

  The WLAN sleep control unit (sleep control unit) 16 performs sleep control of the WLAN module 11. The WLAN sleep control unit 16 transmits a sleep control signal to the power supply control unit 114 of the WLAN module 11 to place the WLAN module 11 in a sleep state (WLAN sleep state) in which the wireless communication function is stopped. Also, the WLAN sleep control unit 16 transmits an active control signal to the power supply control unit 114 of the WLAN module 11, thereby bringing the WLAN module 11 into an active state in which the wireless communication function is functioned.

In addition, when movement is detected by an acceleration sensor control unit 17 described later in the WLAN sleep state, the WLAN sleep control unit 16 transmits an active control signal to the power supply control unit 114 to cancel the WLAN sleep state.
The WLAN sleep control unit (output unit) 16 detects terminal information when movement of the wireless terminal device 10 is detected by an acceleration sensor control unit 17 to be described later and the WLAN module 11 is released from the sleep state 11 when the wireless terminal device 10 is in the WLAN sleep state. The transmission unit 113 is instructed to output terminal information for the access point 3.

  As described above, the terminal information is the IP address and port number information of the wireless terminal device 10 and is used when an external device such as the access device 4 remotely accesses the wireless terminal device 10 via the network 50. Information. The terminal information is stored in, for example, the RAM 13 and the WLAN sleep control unit 16 notifies the terminal information transmission unit 113 of the WLAN module 11 of the terminal information.

Further, the WLAN sleep control unit (sleep start time setting unit) 16 changes the transition timing to the sleep state according to the distance from the access point 3 to the wireless terminal device 10. That is, the transition time to the sleep state is set according to the distance from the access point 3 to the wireless terminal device 10.
In general, the radio field intensity in the wireless terminal device 10 changes according to the distance from the access point 3 to the wireless terminal device 10. That is, the RSSI value representing the radio wave intensity changes according to the distance from the access point 3.

In the present network system 1, the WLAN sleep start time corresponding to the distance from the access point 3 to the wireless terminal device 10 is obtained by associating the RSSI value with the WLAN sleep start time in the sleep start time setting data table 131 described above. Is prepared in advance.
The WLAN sleep control unit 16 refers to the sleep start time setting data table 131 based on the RSSI value acquired by the radio wave intensity acquisition unit 112 of the WLAN module 11 and determines the WLAN sleep start time corresponding to the RSSI value. That is, the transition time to the sleep state (WLAN sleep start time) according to the distance from the access point 3 to the wireless terminal device 10 is determined.

  The WLAN sleep control unit 16 notifies the sleep start timer 18 of the determined WLAN sleep start time and a timing start instruction. The WLAN sleep control unit 16 measures time in the sleep start timer 18 and, when receiving the sleep start notification, transmits a sleep control signal to the power supply control unit 114 of the WLAN module 11 to put the WLAN module 11 in the sleep state.

As described above, the WLAN sleep control unit 16 sets the transition time to the sleep state in accordance with the distance from the access point 3 to the wireless terminal device 10, and sleeps the WLAN module 11 according to the set transition time. Put it in a state.
As described above, in the sleep start time setting data table 131, the smaller the RSSI value is, the longer the WLAN sleep start time is. As a result, the longer the distance from the access point 3 to the wireless terminal device 10, the sleep state Slow down the transition time.

The fact that the wireless terminal device 10 is located far from the access point 3 means that the wireless terminal device 10 can leave the communication range of the access point 3 and move to the communication range of another adjacent access point 3. High nature. That is, there is a high possibility that the access point 3 to which the wireless terminal device 10 is connected will be switched.
In the present network system 1, when the wireless terminal device 10 is in a state where there is a high possibility that the connection destination access point 3 is switched as described above, the transition to the WLAN sleep state is suppressed.

  Thereby, in the radio | wireless terminal apparatus 10, when the access point 3 of the connection destination switches, the probability that the WLAN module 11 is an active state can be raised. Accordingly, when the wireless terminal device 10 is switched to the connection destination access point 3, the terminal information transmission unit 113 notifies the new access point 3 of the terminal information, and the management server 2 manages the wireless terminal device 10. be able to.

The WLAN sleep control unit 16 has a function of requesting the acceleration sensor control unit 17 to start power control of the acceleration sensor module 12.
The acceleration sensor control unit 17 acquires acceleration information from the sensing unit 121 of the acceleration sensor module 12, and detects the movement of the wireless terminal device 10 based on the acceleration information.

For example, based on the acceleration information, the acceleration sensor control unit 17 continues the displacement amount (acceleration change) per unit time that is equal to or greater than a predetermined threshold in any movement direction for a predetermined threshold time (for example, 10 seconds). The movement of the wireless terminal device 10 is detected by determining whether or not the wireless terminal device 10 is present.
Further, the acceleration sensor control unit 17 controls ON / OFF of the power source of the sensing unit 121 of the acceleration sensor module 12. Specifically, the acceleration sensor control unit 17 transmits a control signal (acceleration sensor ON signal / acceleration sensor OFF signal) that instructs the power supply control unit 123 to turn on or off the power. Thereby, the acceleration sensor control unit 17 performs control to turn on or off the power of the sensing unit 121 of the acceleration sensor module 12.

The acceleration sensor control unit 17 turns on the power of the sensing unit 121 when the WLAN sleep control unit 16 shifts the WLAN module 11 to the sleep state.
And the acceleration sensor control part 17 acquires acceleration information from the sensing part 121 in a WLAN sleep state, and detects the movement of the said radio | wireless terminal apparatus 10. FIG.
The acceleration sensor control unit 17 desirably turns off the sensing unit 121 when the WLAN sleep control unit 16 shifts the WLAN module 11 to the active state. Thereby, the power consumption in the acceleration sensor module 12 can be reduced. However, in the wireless terminal device 10, when it is necessary to separately detect acceleration by the sensing unit 121, the present invention is not limited to this, and the sensing unit 121 is appropriately turned on to function.

Further, the acceleration sensor control unit 17 (movement detection timing setting unit) sets the acceleration detection timing by the sensing unit 121 according to the distance from the access point 3 to the wireless terminal device 10.
In the network system 1, an acceleration sensor interval corresponding to the distance from the access point 3 to the wireless terminal device 10 is prepared by associating the RSSI value with the acceleration sensor interval in the acceleration sensor interval setting data table 132 described above. To do.

  The acceleration sensor control unit 17 refers to the acceleration sensor interval setting data table 132 based on the RSSI value acquired by the radio wave intensity acquisition unit 112 of the WLAN module 11 and determines an acceleration sensor interval corresponding to the RSSI value. That is, the detection interval (interval time) by the sensing unit 121 of the acceleration sensor module 12 according to the distance from the access point 3 to the wireless terminal device 10 is determined.

  The acceleration sensor control unit 17 notifies the determined acceleration sensor interval to the acceleration sensor interval setting unit 122 of the acceleration sensor module 12. The acceleration sensor interval setting unit 122 stores the notified acceleration sensor interval, and the sensing unit 121 measures acceleration and notifies the acceleration sensor control unit 17 of acceleration information for each acceleration sensor interval.

That is, the sensing unit 121 detects the movement of the wireless terminal device 10 according to the detection timing set in the acceleration sensor interval setting unit 122. Thus, the acceleration sensor control unit 17 transmits the wireless terminal device 10 from the access point 3. The detection timing of the movement of the wireless terminal device 10 by the sensing unit 121 is changed according to the distance up to.

  As described above, in the acceleration sensor interval setting data table 132, the smaller the RSSI value is, the shorter the acceleration sensor interval is. As a result, the sensing unit 121 increases as the distance from the access point 3 to the wireless terminal device 10 increases. The detection interval of the movement of the wireless terminal device 10 is shortened. That is, movement detection of the wireless terminal device 10 is frequently performed.

In the present network system 1, when the wireless terminal device 10 is in a state where there is a high possibility that the access point 3 to be connected is switched, the detection interval of the movement of the wireless terminal device 10 by the sensing unit 121 is shortened. The movement detection of the wireless terminal device 10 is frequently performed.
Thereby, in the radio | wireless terminal apparatus 10, when the access point 3 of the connection destination switches, the probability of detecting the movement of the said radio | wireless terminal apparatus 10 can be raised. Accordingly, when the access point 3 to which the wireless terminal device 10 is connected is switched, the terminal information transmission unit 113 notifies the new access point 3 of the terminal information, and the management server 2 changes the wireless terminal device 10 to the wireless terminal device 10. Can be managed.

An overview of the processing during sleep of the wireless terminal device 10 in the network system 1 as an example of the first embodiment configured as described above will be described with reference to FIG.
In the example shown in FIG. 5, the wireless terminal device 10 within the communication range of the access point 3-1 shifts to the WLAN sleep state and moves into the communication range of the access point 3-2 while remaining in the WLAN sleep state. An example is shown.

  When the wireless terminal device 10 within the communication range of the access point 3-1 shifts to the WLAN sleep state, the wireless terminal device 10 shifts to the sleep state with respect to the management server 2 via the access point 3-1. Notification (sleep notification) (see reference S1). At this time, the terminal information transmission unit 113 transmits terminal information to the management server 2 via the access point 3.

In the management server 2, the terminal information received from the wireless terminal device 10 is stored in association with information for identifying the wireless terminal device 10 such as a Media Access Control (MAC) address, for example (see S2).
In the wireless terminal device 10, the WLAN sleep control unit 16 transmits a sleep control signal to the power supply control unit 114, thereby causing the WLAN module 11 to shift to the sleep state (see S <b> 3). In accordance with this, the acceleration sensor control unit 17 transmits an acceleration sensor ON signal to the power supply control unit 123 to validate the acceleration sensor module 12 (see reference numeral S4). However, when the acceleration sensor module 12 is already enabled, transmission of the acceleration sensor ON signal to the power supply control unit 123 may be omitted.

  Here, while the WLAN module 11 is in the sleep state, the user carries the wireless terminal device 10 and moves into the communication range of the access point 3-2 (see reference S5). In the wireless terminal device 10, the sensing unit 121 transmits acceleration information to the acceleration sensor control unit 17, and the acceleration sensor control unit 17 detects the movement of the wireless terminal device 10 based on the received acceleration information. The acceleration sensor control unit 17 notifies the WLAN sleep control unit 16 of a power-on request for the WLAN module 11, and the WLAN sleep control unit 16 transmits an active control signal to the power supply control unit 114. As a result, the WLAN module 11 is enabled and WLAN communication can be performed with the access point 3-2 (see S6).

The terminal information transmission unit 113 notifies the management server 2 of terminal information via the access point 3-2 in the communication range (see reference S7). Thereby, the management server 2 memorize | stores the terminal information notified from the radio | wireless terminal apparatus 10 located in the communication range of the access point 3-2 (refer code | symbol S8).
When the access device 4 performs push notification or data access to the wireless terminal device 10, the access terminal 4 requests the management server 2 for the terminal information of the wireless terminal device 10 to be accessed (reference S9). reference).

Since the management server 2 stores (manages) the terminal information of the wireless terminal device 10 after moving to the access point 3-2, the terminal information of the wireless terminal device 10 after moving is stored in the access terminal 4. The SSID of the access point 3-2 that is the connection destination can be notified.
The access terminal 4 issues a terminal Wake command to the wireless terminal device 10 based on the information notified from the management server 2 (see S10). As a result, the wireless terminal device 10 in the WLAN sleep state is waked and the WLAN sleep state is released. That is, the access terminal 4 can access the wireless terminal device 10.

Thereafter, the access terminal 5 performs, for example, transmission of a push message and data access to the wireless terminal device 10 (see reference numeral S11). The wireless terminal device 10 can receive a push message.
Next, a WLAN sleep control method in the network system 1 as an example of the first embodiment will be described according to a flowchart (steps A10 to A130) shown in FIG.

The WLAN sleep control unit 16 acquires the key update time from the access point 3 via the AP connection information acquisition unit 111 of the WLAN module 11. Further, the WLAN sleep control unit 16 acquires an RSSI value indicating the radio field intensity of the received radio wave via the radio field intensity acquisition unit 112 (step A10).
The WLAN sleep control unit 16 refers to the system clock (not shown) of the wireless terminal device 10 and immediately before the key update time (step A20), the WLAN sleep control unit 16 passes through the radio wave intensity acquisition unit 112. The RSSI information is acquired again (step A30). Note that “immediately before the key update time” indicates, for example, a timing having a time margin that allows the WLAN sleep control unit 16 to complete the acquisition of the RSSI value via the radio wave intensity acquisition unit 112 by the WLAN key update time. .

  The WLAN sleep control unit 16 transmits a sleep control signal to the power supply control unit 114 and starts shifting to the WLAN sleep (step A40). Further, the WLAN sleep control unit 16 stores the RSSI value acquired by the radio wave intensity acquisition unit 112 and information indicating the power state of the WLAN module 11 (WLAN state information) in the RAM 13 (WLAN state information storage unit) (step A50). ).

  The WLAN sleep control unit 16 requests the acceleration sensor control unit 17 to start power control of the acceleration sensor module 12, and the acceleration sensor control unit 17 starts power control of the acceleration sensor module 12 according to this request ( Step A60). As a result, in the acceleration sensor module 12, the sensing unit 121 detects the acceleration fluctuation and notifies the acceleration sensor control unit 17 of the acceleration information. That is, movement detection of the wireless terminal device 10 by the acceleration sensor module 12 is started. The sensing unit 121 performs acceleration detection for each acceleration sensor interval set in the acceleration sensor interval setting unit 122.

  The WLAN sleep control unit 16 refers to the system clock of the wireless terminal device 10 to confirm whether it is immediately before the WLAN key update time (step A70). For example, the WLAN sleep control unit 16 determines whether the remaining time until the WLAN key update time has reached a predetermined value. As the predetermined value, for example, it is desirable to set in advance the time required to cancel the WLAN sleep and start communication with the access point 3.

If it is just before the WLAN key update time (see YES route in step A70), the WLAN sleep control unit 16 cancels the WLAN sleep by transmitting an active control signal to the power supply control unit 114 (step A90). ). Thereby, WLAN communication with the access point 3 is resumed.
If it is not immediately before the WLAN key update time (see NO route in step A70), the acceleration sensor control unit 17 determines whether an acceleration change that continues for a certain period of time is detected based on the acceleration information from the sensing unit 121. Judgment is made (step A80). That is, it is determined whether movement of the wireless terminal device 10 is detected. When the acceleration change which continues for a fixed time is not detected (NO route of step A80), it returns to step A70. If a change in acceleration that continues for a certain time is detected (see YES route in step A80), the process proceeds to step A90.

Thereafter, the WLAN sleep control unit 16 causes the terminal information transmission unit 113 to transmit terminal information (IP address, port number) to the management server 2 via the access point 3 (step A100).
The WLAN sleep control unit 16 acquires the WLAN key update time from the access point 3 via the AP connection information acquisition unit 111 of the WLAN module 11. Also, the WLAN sleep control unit 16 acquires an RSSI value indicating the radio field intensity of the received radio wave from the radio field intensity acquisition unit 112 (step A110).

The WLAN sleep control unit 16 stores the RSSI value acquired from the radio wave intensity acquisition unit 112 and information (WLAN state information) indicating the power state of the WLAN module 11 in the RAM 13 (WLAN state information storage unit) (step A120).
Then, the WLAN sleep control unit 16 refers to the sleep disclosure time setting data table 131 based on the RSSI value acquired from the radio wave intensity acquisition unit 112, and determines the WLAN sleep start time corresponding to the RSSI value. The WLAN sleep control unit 16 sets the sleep disclosure time in the sleep start timer 18 and starts measuring time (step A130). Thereby, WLAN sleep control is complete | finished.

Next, a power control method for the acceleration sensor module 12 in the network system 1 as an example of the first embodiment will be described with reference to a flowchart (steps B10 to B40) shown in FIG.
The acceleration sensor control unit 17 reads the RSSI value with reference to the WLAN state information 133 stored in the RAM 13 (WLAN state storage unit). Based on the RSSI value, the acceleration sensor control unit 17 reads the acceleration sensor interval corresponding to the read RSSI value with reference to the acceleration sensor interval setting data table 132. The acceleration sensor control unit 17 sets the read acceleration sensor interval in the acceleration sensor interval setting unit 122 of the acceleration sensor module 12 (step B10).

The acceleration sensor control unit 17 transmits an acceleration sensor ON signal to the power supply control unit 123 of the acceleration sensor module 12, thereby turning on the sensing unit 121 and starting periodic measurement of acceleration (step B20). ).
That is, the sensing unit 121 measures acceleration every time the acceleration sensor interval stored in the acceleration sensor interval setting unit 122 elapses.

Thereafter, the WLAN sleep control unit 16 refers to the WLAN state information 133 and determines whether or not the WLAN sleep is in progress (step B30). If the WLAN is in sleep mode (see YES route in step B30), it is determined again in step B30 whether the WLAN is in sleep mode.
If the WLAN sleep state is not set (see the NO route in step B30), the acceleration sensor control unit 17 transmits an acceleration sensor OFF signal to the power supply control unit 123 to turn off the sensing unit 121 (step B40). The process is terminated.

  As described above, according to the network system 1 as an example of the first embodiment, the WLAN sleep control unit 16 determines the WLAN sleep start time of the WLAN module 11 according to the RSSI value measured by the radio wave intensity acquisition unit 112. Set. Then, the WLAN sleep control unit 16 shifts the WLAN module 11 to the sleep state when the WLAN sleep start time has elapsed.

In the wireless terminal device 10, the power consumption can be reduced and the operation time can be extended by putting the WLAN module 11 in the sleep state.
In particular, the longer the distance from the access point 3 to the wireless terminal device 10, the longer the WLAN sleep start time. That is, in a state where the wireless terminal device 10 is far from the access point 3 and is likely to move out of the communication range of the connected access point 3 and move to the communication range of another adjacent access point 3. Suppresses the transition to the sleep state.

  Thereby, in the radio | wireless terminal apparatus 10, when the access point 3 of the connection destination switches, the probability that the WLAN module 11 is an active state can be made high. Therefore, when the wireless terminal device 10 is switched to the access point 3 that is the connection destination, the terminal information transmission unit 113 notifies the new access point 3 of the terminal information. Thereby, the management server 2 can manage the wireless terminal device 10, and the access device 4 can access the wireless terminal device 10.

Further, the acceleration sensor control unit 17 sets an acceleration sensor interval according to the RSSI value measured by the radio wave intensity acquisition unit 112. Then, the sensing unit 121 of the acceleration sensor module 12 repeatedly measures acceleration every acceleration sensor interval.
In particular, the acceleration sensor interval is shortened as the distance from the access point 3 to the wireless terminal device 10 increases. That is, in a state where there is a high possibility that the wireless terminal device 10 moves out of the communication range of the currently connected access point 3 and moves to the communication range of another adjacent access point 3, the sensing unit 121 frequently detects the movement of the wireless terminal device 10. To do.

Thereby, in the radio | wireless terminal apparatus 10, switching of the access point 3 of the connection destination can be detected rapidly.
Accordingly, when the access point 3 to which the wireless terminal device 10 is connected is switched, the terminal information transmission unit 113 notifies the new access point 3 of the terminal information, and the management server 2 changes the wireless terminal device 10 to the wireless terminal device 10. Can be managed.

That is, the access device 4 can access the sleeping wireless terminal device 10 from a remote location. Thereby, for example, even when the wireless terminal device 10 supports only a LAN as a communication method, it is possible to perform data access and push message transmission quickly.
(B) Description of the second embodiment
FIG. 8 is a diagram illustrating a functional configuration of the wireless terminal device 10 of the network system 1 as an example of the second embodiment.

  In the network system 1 as an example of the second embodiment, the wireless terminal device 10 includes an acceleration fluctuation check counter 134 and a WLAN key update time extension request information transmission unit 115 as shown in FIG. The configuration is the same as in the first embodiment. In the figure, the same reference numerals as those already described indicate the same parts, and detailed description thereof is omitted.

The network system 1 as an example of the second embodiment reduces the number of independent wakes of the wireless terminal device 10 in the sleep state by extending the WLAN key update time under a predetermined condition, and further increases the power consumption. Realize reductions.
Specifically, when all the wireless terminal devices 10 located within the communication range of the access point 3 have no acceleration fluctuation during each sleep, that is, when each wireless terminal device 10 is not moving in the sleep state, Extend the WLAN key update time.

The acceleration fluctuation check counter 134 is a counter that stores the number of acceleration fluctuations detected by the sensing unit 121. For example, a predetermined storage area of the RAM 13 functions as the acceleration fluctuation check counter 134.
The acceleration sensor control unit 17 increments the acceleration variation check counter 134 when acceleration variation is detected by the sensing unit 121. The acceleration sensor control unit 17 also initializes (resets) the acceleration fluctuation check counter 134.

The WLAN key update time extension request information transmission unit 115 transmits WLAN key update time extension request information to the access point 3 in accordance with an instruction from the WLAN sleep control unit 16. The WLAN module 11 has a function as the WLAN key update time extension request information transmission unit 115.
FIG. 9 is a diagram illustrating WLAN key update time extension request information in the network system 1 as an example of the second embodiment.

  As shown in FIG. 9, the WLAN key update time extension request information is configured by associating a terminal MAC address with an extension request. The terminal MAC address is the MAC address of the wireless terminal device 10 that transmits the WLAN key update time extension request information. The MAC address is a physical address assigned to the WLAN module 11 and is uniquely assigned to the wireless terminal device 10 on the network system 1. That is, the wireless terminal device 10 can be specified by this MAC address.

The extension request is information indicating that the wireless terminal device 10 requests the access point 3 to extend the WLAN key update time. As this extension request, for example, “YES” is set when an extension of the WLAN key update time is requested, and “NO” is set when no extension of the WLAN key update time is requested.
The WLAN sleep control unit 16 refers to the acceleration fluctuation check counter 134 when the WLAN sleep is canceled. Then, the WLAN sleep control unit 16 sends the WLAN key update time extension request information transmission unit 115 to the WLAN access point 3 in the case where no acceleration fluctuation has been detected during the sleep state of the wireless terminal device 10. Send a key update time extension request.

FIG. 10 is a diagram illustrating a functional configuration of the access point 3 of the network system 1 as an example of the second embodiment.
In addition to each function as the access point 3 of the first embodiment, the access point 3 of the second embodiment further includes a WLAN key update time extension request information receiving unit 31 and a WLAN key update as shown in FIG. A function as the time extension determination unit 32 is provided. In FIG. 10, a WLAN key update time storage unit 33 and a WLAN key update time information transmission unit 34, which are not illustrated in the first embodiment, are also illustrated. The functions as the WLAN key update time storage unit 33 and the WLAN key update time information transmission unit 34 also have the access point 3 of the first embodiment.

The WLAN key update time storage unit 33 stores the WLAN key update time. The WLAN key update time is written and read by the WLAN key update time extension determination unit 32. The WLAN key update time storage unit 33 is realized by a storage device (not shown) such as a RAM, for example.
The WLAN key update time information transmission unit 34 transmits the WLAN key update time stored in the WLAN key update time storage unit 33 to the wireless terminal device 10.

The WLAN key update time extension request information receiving unit 31 receives the WLAN key update time extension request information transmitted from the wireless terminal device 10. The WLAN key update time extension request information reception unit 31 delivers the received WLAN key update time extension request information to the WLAN key update time extension determination unit 32.
The functions of the WLAN key update time information transmitting unit 34 and the WLAN key update time extension request information receiving unit 31 are realized by, for example, a WLAN module (not shown).

The WLAN key update time extension determination unit 32 determines whether or not to extend the WLAN key update time based on the WLAN key update time extension request information received from the wireless terminal device 10.
The WLAN key update time extension determination unit 32 includes a WLAN key update time extension request information buffer 321, and receives a WLAN key update time extension request received from one or more wireless terminal apparatuses 10 located within the communication range of the access point 3. The information is stored in this WLAN key update time extension request information buffer 321.

FIG. 11 is a diagram illustrating WLAN key update time extension request information stored in the WLAN key update time extension request information buffer 321 in the network system 1 as an example of the second embodiment. FIG. 11 shows an example in which three wireless terminal devices 10 exist within the communication range of the access point 3.
As shown in FIG. 11, the WLAN key update time extension determination unit 32 stores the WLAN key update time extension request information buffer 321 in the WLAN key update time extension request information buffer 321, for example, for each WLAN key update time received from all the wireless terminal devices 10 within the communication range. Store information as a list.

As a result, by referring to the WLAN key update time extension request information stored in the WLAN key update time extension request information buffer 321, an extension request for all the wireless terminal devices 10 within the communication range of the access point 3 can be easily made. Can be confirmed.
The WLAN key update time extension determination unit 32 refers to the WLAN key update time extension request information stored in the WLAN key update time extension request information buffer 321 and refers to all wireless terminal devices within the communication range of the access point 3. If the ten extension request is YES, it is determined to extend the WLAN key update time.

That is, if the WLAN key update time extension determination unit 32 determines that all the wireless terminal devices 10 in the sleep range of all the wireless terminal devices 10 within the communication range of the access point 3 have no acceleration fluctuation, Extend key renewal time.
When the WLAN key update time extension determination unit 32 determines to extend the WLAN key update time, the WLAN key update time extension determination unit 32 sets a new WLAN key update time (t = t + T) obtained by extending the WLAN key update time (t) by a predetermined time (T). It is determined and stored in the WLAN key update time storage unit 33. That is, the WLAN key update time previously stored in the WLAN key update time storage unit 33 is updated with a new WLAN key update time.

That is, the WLAN key update time extension determination unit 32 receives the WLAN key update time extension request information from all the wireless terminal devices 10 managed by the access point 3, and updates the WLAN key. Function as.
The WLAN key update time extension determination unit 32 reads the WLAN key update time stored in the WLAN key update time storage unit 33, passes it to the WLAN key update time information transmission unit 34, and transmits it to the wireless terminal device 10. Let

A WLAN sleep control method in the network system 1 as an example of the second embodiment configured as described above will be described with reference to a flowchart (steps A10 to A90, A91, A92, A100 to A130) shown in FIG.
In the following, steps with the same reference numerals as the reference numerals in the drawings indicate the same processing, and detailed description thereof will be omitted.

The WLAN sleep control unit 16 cancels the WLAN sleep by transmitting an active control signal to the power supply control unit 114 (step A90), and the WLAN communication with the access point 3 is resumed.
Thereafter, the acceleration sensor control unit 17 refers to the counter value of the acceleration fluctuation check counter 134 to determine whether the counter value (n) is 0 (n = 0?), That is, the acceleration is performed by the sensing unit 121 during the WLAN sleep. It is confirmed whether a change has been detected (step A91).

If no acceleration change is detected during WLAN sleep (see NO route in step A91), the process proceeds to step A100.
On the other hand, if a change in acceleration is detected during WLAN sleep (see YES route in step A91), the WLAN sleep control unit 16 uses the WLAN key update time extension request information transmission unit 115 to transmit the WLAN to the access point 3. Send key update time extension request information. This requests the access point 3 to extend the WLAN key update time (step A92). Thereafter, the process proceeds to step A100.

Next, WLAN key update time extension determination processing at the access point 3 of the network system 1 as an example of the second embodiment will be described with reference to the flowchart (steps C10 to C30) shown in FIG.
The WLAN key update time extension determination unit 32 refers to the WLAN key update time extension request information stored in the WLAN key update time extension request information buffer 321 and refers to all the wireless terminal devices 10 within the communication range of the access point 3. Confirms whether there is an extension request from (step C10). That is, the WLAN key update time extension determination unit 32 confirms whether or not the extension requests of all the wireless terminal devices 10 within the communication range of the access point 3 are YES.

  When there is an extension request from all the wireless terminal devices 10 within the communication range of the access point 3 (see YES route in Step C10), the WLAN key update time extension determination unit 32 extends the WLAN key update time ( Step C20). Specifically, the WLAN key update time extension determination unit 32 extends the WLAN key update time (t) by a predetermined time (T) (t = t + T), and uses the newly calculated WLAN key update time as a WLAN key update. It memorize | stores in the time preservation | save part 33, and complete | finishes a process.

On the other hand, when there is no extension request from all the wireless terminal devices 10 within the communication range of the access point 3 (see YES route in Step C10), that is, when the extension request has not arrived from at least one wireless terminal device 10. Resets the WLAN key update time with the initial value (t0) (t = t0; Step C30), and ends the process.
Thus, according to the network system 1 as an example of the second embodiment, it is possible to obtain the same operational effects as those of the first embodiment.

Furthermore, in the access point 3, when the WLAN key update time extension is transmitted from all the wireless terminal devices 10 located within the communication range, the WLAN key update time extension determination unit 32 extends the WLAN key update time.
That is, when all the wireless terminal devices 10 within the communication range of the access point 3 have no acceleration fluctuation during each sleep, that is, when each wireless terminal device 10 is not moving in the sleep state, the WLAN key update time Is extended.

When all the wireless terminal devices 10 within the communication range of the access point 3 are not moving in the sleep state, it is not necessary to perform the WLAN key update. By extending the WLAN key update time, it is possible to reduce the number of times the wireless terminal apparatus 10 in the sleep state performs independent wake-up in order to exchange keys, thereby further reducing power consumption.
(C) Others In each of the embodiments described above, the CPU 15 of the wireless terminal device 10 functions as the above-described WLAN sleep control unit 16, acceleration sensor control unit 17, and sleep start timer 18 by executing a program.

  A program for realizing the functions as the WLAN sleep control unit 16, the acceleration sensor control unit 17, and the sleep start timer 18 is, for example, a flexible disk, a CD (CD-ROM, CD-R, CD-RW, etc.). ), DVD (DVD-ROM, DVD-RAM, DVD-R, DVD + R, DVD-RW, DVD + RW, HD DVD, etc.), Blu-ray disc, magnetic disc, optical disc, magneto-optical disc, etc. Provided in recorded form. Then, the computer reads the program from the recording medium, transfers it to the internal storage device or the external storage device, and uses it. The program may be recorded in a storage device (recording medium) such as a magnetic disk, an optical disk, or a magneto-optical disk, and provided from the storage device to the computer via a communication path.

  When realizing the functions as the WLAN sleep control unit 16, the acceleration sensor control unit 17, and the sleep start timer 18, the program stored in the internal storage device (the RAM 13 and the ROM 14 in this embodiment) is stored in the microprocessor of the computer ( In this embodiment, it is executed by the CPU 15). At this time, the computer may read and execute the program recorded on the recording medium.

Further, a CPU (not shown) of the access point 3 functions as the above-described WLAN key update time extension determination unit 32 by executing a program.
Note that programs for realizing the function as the WLAN key update time extension determination unit 32 include, for example, a flexible disk, CD (CD-ROM, CD-R, CD-RW, etc.), DVD (DVD-ROM, DVD-). RAM, DVD-R, DVD + R, DVD-RW, DVD + RW, HD DVD, etc.), Blu-ray disc, magnetic disc, optical disc, magneto-optical disc, and the like. Then, the computer reads the program from the recording medium, transfers it to the internal storage device or the external storage device, and uses it. The program may be recorded in a storage device (recording medium) such as a magnetic disk, an optical disk, or a magneto-optical disk, and provided from the storage device to the computer via a communication path.

When realizing the function as the WLAN key update time extension determination unit 32, a program stored in an internal storage device (RAM or ROM not shown in the present embodiment) is stored in a microprocessor of a computer (a CPU not shown in the present embodiment). ) Is executed. At this time, the computer may read and execute the program recorded on the recording medium.
In the present embodiment, the computer is a concept including hardware and an operating system, and means hardware that operates under the control of the operating system. Further, when an operating system is unnecessary and hardware is operated by an application program alone, the hardware itself corresponds to a computer. The hardware includes at least a microprocessor such as a CPU and means for reading a computer program recorded on a recording medium. In this embodiment, each of the wireless terminal device 10 and the access point 3 is a computer. It has the function of.

The disclosed technology is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present embodiment. Each structure and each process of this embodiment can be selected as needed, or may be combined suitably.
For example, in each of the above-described embodiments, the radio wave intensity is expressed using an RSSI value, but the present invention is not limited to this, and the radio wave intensity may be expressed using a value other than the RSSI value. Can be implemented.

  In each of the above-described embodiments, the sleep start time setting data table 131 is used as control information for associating the reception intensity with the time until the WLAN module 11 shifts to the sleep state. However, the present invention is not limited to this. is not. In each of the above-described embodiments, the acceleration sensor interval setting data table 132 is used as control information for associating the reception intensity with the execution interval (interval) of acceleration measurement by the sensing unit 121 of the acceleration sensor module 12. It is not limited to this. That is, the control information does not necessarily need to be a table, and can be implemented with various modifications.

Further, in each of the above-described embodiments, an example is shown in which the access point 3 and the wireless terminal device 10 perform communication in accordance with the WiFi standard, but the present invention is not limited to this, and other wireless communication standards You may communicate along.
In each of the above-described embodiments, the CPU 15 has a function as the sleep start timer 18, but the present invention is not limited to this. For example, the function as the sleep start timer 18 may be realized by a separately provided timer circuit, and can be implemented with various modifications.

According to the above-described disclosure, this embodiment can be implemented and manufactured by those skilled in the art.
(D) Appendix (Appendix 1)
A terminal device having a wireless communication function for performing wireless communication with a relay device,
A sleep control unit configured to enter a sleep state in which the wireless communication function is stopped;
A movement detection unit that detects movement of the terminal device in the sleep state;
When the movement detection unit detects movement of the terminal device, the terminal device includes an output unit that outputs terminal information of the terminal device.

(Appendix 2)
With an acceleration sensor,
The terminal device according to appendix 1, wherein the movement detection unit detects a movement of the terminal device based on an acceleration fluctuation detected by the acceleration sensor.
(Appendix 3)
The terminal device according to appendix 2, further comprising a sensor control unit that enables the acceleration sensor at the time of transition to the sleep state.

(Appendix 4)
The terminal device according to any one of appendices 1 to 3, wherein the sleep control unit cancels the sleep state when the movement detection unit detects movement of the terminal device.
(Appendix 5)
A sleep start time setting unit for setting a transition time to the sleep state according to the distance from the relay device,
The terminal device according to any one of appendices 1 to 4, wherein the sleep control unit sets the sleep state according to the transition time set by the sleep start time setting unit.

(Appendix 6)
The terminal device according to appendix 5, wherein the sleep start time setting unit delays the transition time to the sleep state as the distance from the relay device increases.
(Appendix 7)
In accordance with the distance from the relay device, provided with a movement detection timing setting unit for setting the detection timing of the movement of the terminal device by the movement detection unit,
The terminal device according to any one of appendices 1 to 6, wherein the movement detection unit detects movement of the terminal device in accordance with the detection timing set by the movement detection timing setting unit.

(Appendix 8)
The terminal device according to appendix 7, wherein the movement detection timing setting unit shortens the detection interval of movement of the terminal device by the movement detection unit as the distance from the relay device increases.
(Appendix 9)
When the movement detection unit does not detect the movement of the terminal device in the sleep state, the extension request information transmission unit transmits request information for requesting extension of the update time of the wireless communication key to the relay device. The terminal device according to any one of appendices 1 to 8, characterized in that:

(Appendix 10)
A relay device;
A network system comprising a terminal device having a wireless communication function for performing wireless communication with the relay device,
A sleep control unit configured to enter a sleep state in which the wireless communication function is stopped;
A movement detector for detecting movement of the terminal device in the sleep state;
A network system comprising: an output unit that outputs terminal information of the terminal device when the movement detection unit detects movement of the terminal device.

(Appendix 11)
The terminal device includes an acceleration sensor;
The network system according to appendix 10, wherein the movement detection unit detects movement of the terminal device based on acceleration fluctuation detected by the acceleration sensor.
(Appendix 12)
12. The network system according to claim 11, further comprising a sensor control unit that enables the acceleration sensor when shifting to the sleep state.

(Appendix 13)
The network system according to any one of appendices 10 to 12, wherein the sleep control unit cancels the sleep state when the movement detection unit detects movement of the terminal device.
(Appendix 14)
A sleep start time setting unit for setting a transition time to the sleep state according to the distance from the relay device,
14. The network system according to any one of appendices 10 to 13, wherein the sleep control unit sets the sleep state according to the transition time set by the sleep start time setting unit.

(Appendix 15)
15. The network system according to appendix 14, wherein the sleep start time setting unit delays the transition time to the sleep state as the distance from the relay device increases.
(Appendix 16)
In accordance with the distance from the relay device, provided with a movement detection timing setting unit for setting the detection timing of the movement of the terminal device by the movement detection unit,
The network system according to any one of appendices 10 to 15, wherein the movement detection unit detects movement of the terminal device according to the detection timing set by the movement detection timing setting unit.

(Appendix 17)
The network system according to appendix 16, wherein the movement detection timing setting unit shortens the detection interval of movement of the terminal device by the movement detection unit as the distance from the relay device increases.
(Appendix 18)
The terminal device is
If the movement detection unit does not detect the movement of the terminal device during the sleep state, the request for requesting extension of the update time of the wireless communication key is transmitted to the relay device. Have a department,
The relay device is
Additional keys 10 to 17, further comprising: a key update inhibiting unit that inhibits updating of the encryption key information related to the wireless communication when the request information is received from all the terminal devices managed by the relay device. The network system according to any one of the above.

(Appendix 19)
A computer program having a wireless communication function for performing wireless communication with a relay device,
Put the wireless communication function in sleep state,
Detecting the movement of the terminal device in the sleep state;
When detecting the movement of the terminal device, the program causes the computer to execute a process of outputting terminal information of the terminal device.

(Appendix 20)
A method for controlling a terminal device having a wireless communication function for performing wireless communication with a relay device,
Entering a sleep state in which the wireless communication function is stopped;
Detecting the movement of the terminal device in the sleep state;
And a step of outputting terminal information of the terminal device when the movement of the terminal device is detected.

1 Network system 2 Management server 3,3-1, 3-2 Access point (relay device)
4 Wide lens 5 Access device 10 Wireless terminal device (terminal device)
11 WLAN module 12 Acceleration sensor module (acceleration sensor)
13 RAM
14 ROM
15 CPU
16 WLAN sleep control unit (sleep control unit, output unit, sleep start time setting unit)
17 Acceleration sensor control unit (sensor control unit, movement detection unit, movement detection timing setting unit)
18 Timer for Sleep Start 31 WLAN Key Update Time Extension Request Information Receiving Unit 32 WLAN Key Update Time Extension Determination Unit 33 WLAN Key Update Time Storage Unit 34 WLAN Key Update Time Information Transmitting Unit 50 Network 111 AP Connection Information Acquisition Unit 112 Acquisition of Radio Signal Strength Unit 113 Terminal information transmission unit 114, 123 Power supply control unit 115 WLAN key update time extension request information transmission unit 121 Sensing unit 122 Acceleration sensor interval setting unit 131 Sleep disclosure time setting data table 132 Acceleration sensor interval setting data table 133 WLAN state information 134 Acceleration fluctuation check counter 321 WLAN key update time extension request information buffer

Claims (12)

A terminal device having a wireless communication function for performing wireless communication with a relay device,
A sleep control unit configured to enter a sleep state in which the wireless communication function is stopped;
A movement detection unit that detects movement of the terminal device in the sleep state;
When the movement detection unit detects movement of the terminal device, the terminal device includes an output unit that outputs terminal information of the terminal device. With an acceleration sensor,
The terminal device according to claim 1, wherein the movement detection unit detects a movement of the terminal device based on an acceleration fluctuation detected by the acceleration sensor.   The terminal device according to claim 2, further comprising a sensor control unit that enables the acceleration sensor at the time of transition to the sleep state.   The terminal device according to claim 1, wherein the sleep control unit cancels the sleep state when the movement detection unit detects movement of the terminal device. A sleep start time setting unit for setting a transition time to the sleep state according to the distance from the relay device,
The terminal device according to claim 1, wherein the sleep control unit sets the sleep state according to the transition time set by the sleep start time setting unit.   The terminal device according to claim 5, wherein the sleep start time setting unit delays the transition time to the sleep state as the distance from the relay device increases. In accordance with the distance from the relay device, provided with a movement detection timing setting unit for setting the detection timing of the movement of the terminal device by the movement detection unit,
The terminal device according to any one of claims 1 to 6, wherein the movement detection unit detects movement of the terminal device according to the detection timing set by the movement detection timing setting unit. .   The terminal device according to claim 7, wherein the movement detection timing setting unit shortens a detection interval of movement of the terminal device by the movement detection unit as the distance from the relay device increases.   When the movement detection unit does not detect the movement of the terminal device in the sleep state, the extension request information transmission unit transmits request information for requesting extension of the update time of the wireless communication key to the relay device. The terminal device according to claim 1, wherein the terminal device is provided. A relay device;
A network system comprising a terminal device having a wireless communication function for performing wireless communication with the relay device,
A sleep control unit configured to enter a sleep state in which the wireless communication function is stopped;
A movement detector for detecting movement of the terminal device in the sleep state;
A network system comprising: an output unit that outputs terminal information of the terminal device when the movement detection unit detects movement of the terminal device. A computer program having a wireless communication function for performing wireless communication with a relay device,
Put the wireless communication function in sleep state,
Detecting the movement of the terminal device in the sleep state;
When detecting the movement of the terminal device, the program causes the computer to execute a process of outputting terminal information of the terminal device. A method for controlling a terminal device having a wireless communication function for performing wireless communication with a relay device,
Entering a sleep state in which the wireless communication function is stopped;
Detecting the movement of the terminal device in the sleep state;
And a step of outputting terminal information of the terminal device when the movement of the terminal device is detected.

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