JP5278018B2 - Mobile terminal apparatus, wireless LAN system, and wireless LAN scan interval switching method used therefor - Google Patents

Mobile terminal apparatus, wireless LAN system, and wireless LAN scan interval switching method used therefor Download PDF

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JP5278018B2
JP5278018B2 JP2009029237A JP2009029237A JP5278018B2 JP 5278018 B2 JP5278018 B2 JP 5278018B2 JP 2009029237 A JP2009029237 A JP 2009029237A JP 2009029237 A JP2009029237 A JP 2009029237A JP 5278018 B2 JP5278018 B2 JP 5278018B2
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scan
wireless lan
scan interval
interval
location registration
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JP2010187147A (en
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真理子 奥山
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日本電気株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/10Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT]
    • Y02D70/14Techniques for reducing energy consumption in wireless communication networks according to the Radio Access Technology [RAT] in Institute of Electrical and Electronics Engineers [IEEE] networks

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device capable of shortening a wake time of a wireless LAN part to save power. <P>SOLUTION: The mobile terminal device can be connected to both of a public mobile communication network and a wireless LAN communication network. The mobile terminal device includes: a scan decision means (scan decision part 11) for conducting a scan decision of the wireless LAN with a notifying timing for notifying position registration information to the public mobile communication network; and a scan interval switching means (scan interval switching part 12) for switching to a scan interval (position registration scan interval 122) different from the usual scan interval (121) of a usual wireless LAN when determined as updating of the position registration information by the scan decision means (scan decision part 11). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a mobile terminal device, a wireless LAN system, a wireless LAN scan interval switching method used therefor, and a program thereof, and more particularly, to a scan interval switching of a wireless LAN (Local Area Network) using a public mobile communication network.

  In recent years, an environment in which a wireless LAN can be used in a public environment is increasing, and services that can use a wireless LAN are also provided in station platforms, concourses, and trains. Furthermore, the number of portable mobile terminal devices with a wireless LAN function is gradually increasing. When data is downloaded by connecting this portable mobile terminal device to the Internet network, it can be used on either the cellular side or the wireless LAN side. Is possible.

  Also, in a notebook personal computer (hereinafter referred to as a notebook personal computer), if a data communication card is used, it can be easily connected to a public mobile communication network. Either of the wireless LAN networks can be used.

  If the wireless LAN side is used, for example, IEEE (Institute of Electrical and Electronic Engineers) 802.11g can communicate at a maximum communication speed of 54 Mbps, and information is faster than data download on the cellular side. Acquisition is possible, and communication charges can be reduced.

  When a wireless LAN can be used at a station platform, the wireless LAN can be used even if the user is on a train or has no wireless LAN equipment in the train. However, since the radio waves of the access point installed in the station platform reach about several tens of meters, if the train starts to move, the wireless LAN will be out of range.

  When the wireless LAN is out of service area, a scan is executed and reconnection is attempted. However, when scanning is performed, the wireless LAN unit is in a wake state, and thus there is a disadvantage that power consumption increases when the frequency of scanning is high. In general, a method such as gradually increasing the scan interval or increasing the scan interval at regular intervals is often used (see, for example, Patent Document 1).

  If the train starts moving and the wireless LAN goes out of service area, when you arrive at the next station, that is, when you enter the radio range of the access point installed at the next station, the wireless LAN of your mobile terminal Need to be within range. However, as described above, since the scan interval time increases with the passage of time from the viewpoint of power consumption, the scan interval becomes long when arriving at the next station, and the probability of scanning immediately upon arrival at the station Will be lower.

  As a method of solving this problem, there is a method of determining based on location registration information transmitted from a mobile terminal device to a public mobile communication network. There are two types of location registration information, and there are packet switching location registration information called “Routing Area Update” and circuit switching location registration information called “Location Area Update”.

  Each location registration information is used to update the location registration information of the mobile terminal device managed by the public mobile communication network when the mobile terminal device moves in the communication area and the base station to be managed is changed. It is transmitted from the mobile terminal device. By resetting the scan interval of the wireless LAN to the initial value at the timing when the mobile terminal device transmits the location registration information, the scan interval can be shortened so that it can belong to an access point that can be detected quickly.

JP 2003-108271 A

  However, in the above-described method, when scanning is performed according to a scan interval for connecting a wireless LAN to an in-house or home wireless LAN system, scanning is started each time position registration information is transmitted. The power saving effect of the mobile terminal device may be impaired. The above-mentioned Patent Document 1 is a technology of a wireless LAN module used only in the office or at home, and is difficult to apply to a mobile terminal device.

  Accordingly, an object of the present invention is to solve the above-described problems, reduce the wake time of the wireless LAN unit, and reduce power consumption, a mobile terminal device, a wireless LAN system, and a wireless LAN scan used for them. An object is to provide an interval switching method and a program thereof.

A mobile terminal device according to the present invention is a mobile terminal device that can be connected to both a public mobile communication network and a wireless LAN (Local Area Network) communication network.
Scan determination means for performing a wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
Scan interval switching means for switching to a scan interval different from the normal normal scan interval of the wireless LAN when the scan determination unit determines that the position registration information is updated ,
The scan interval switching unit performs a scan immediately after the start of scanning, and takes a longer scan interval when the connection to the wireless LAN system is not possible, and switches to a scan interval different from the normal scan interval .

  A wireless LAN system according to the present invention includes the above mobile terminal device.

A wireless LAN scan interval switching method according to the present invention is a wireless LAN scan interval switching method used for a mobile terminal device connectable to both a public mobile communication network and a wireless LAN (Local Area Network) communication network.
The mobile terminal device
Scan determination processing for performing wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
A scan interval switching process for switching to a scan interval different from a normal normal scan interval of the wireless LAN when it is determined that the location registration information is updated in the scan determination process ;
In the scan interval switching process, the scan is performed in a short time immediately after the start of scanning, and when the wireless LAN system cannot be connected, the scan interval is increased and the scan interval is switched to a scan interval different from the normal scan interval. And

The program according to the present invention is a program executed by a central processing unit in a mobile terminal device that can be connected to both a public mobile communication network and a wireless LAN (Local Area Network) communication network.
Scan determination processing for performing wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
The saw including a scan interval switching process of switching to a different scan interval from the usual normal scan interval of the wireless LAN when it is determined by scanning the determination process and the update of the location registration information,
In the scan interval switching process, scanning is performed during a short time immediately after the start of scanning, and when the wireless LAN system cannot be connected, the scan interval is increased and the scan interval is switched to a scan interval different from the normal scan interval. Features.

  By adopting the above-described configuration and operation, the present invention can reduce the wake time of the wireless LAN unit and can achieve the effect of saving power.

It is a block diagram which shows the structural example of the wireless LAN part of the mobile terminal device by this invention. It is a block diagram which shows the structural example of the mobile terminal device by embodiment of this invention. FIG. 3 is a diagram illustrating a scan timing at a normal scan interval and a scan timing at a position registration scan interval in FIG. It is a flowchart which shows the wireless LAN management by the wireless LAN part of FIG. FIG. 4 is a flowchart showing scan control using the normal scan interval of FIG. 3. FIG. 4 is a flowchart illustrating scan control using the position registration scan interval of FIG. 3.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a wireless LAN (Local Area Network) unit of a mobile terminal device according to the present invention. In FIG. 1, the wireless LAN unit 1 includes a scan determination unit 11, a scan interval switching unit 12, and a scan execution unit 13.

  When the wireless LAN is out of service, the scan determination unit 11 determines whether to switch the scan interval. The scan interval switching unit 12 switches the scan interval of the wireless LAN to either the normal scan interval 121 or the position registration scan interval 122 based on the determination result of the scan determination unit 11. The scan execution unit 13 scans the wireless LAN according to the scan interval switched by the scan interval switching unit 12.

  The normal scan interval 121 indicates a scan interval in a normal wireless LAN, and the location registration scan interval 122 indicates a scan interval determined by information from a location registration information management unit (not shown) using a public mobile communication network. Is shown.

  The mobile terminal device according to the present invention saves by switching the scanning interval of the wireless LAN using the timing of notifying the location registration information to the public mobile communication network in an environment where the public mobile communication network and the wireless LAN communication network are mixed. It is characterized by electric power.

  When a mobile terminal apparatus according to the present invention scans a wireless LAN using location registration information in a public mobile communication network in an environment where a public mobile communication network and a wireless LAN communication network coexist, a normal scan interval 121 and a position By switching the registered scan interval 122, the wake time of the wireless LAN unit 1 can be shortened, and power saving can be achieved.

  FIG. 2 is a block diagram showing a configuration example of the mobile terminal apparatus according to the embodiment of the present invention. FIG. 2 shows a configuration of a wireless LAN scan control portion of a mobile terminal device having a wireless LAN function such as a mobile phone or a smartphone.

  In FIG. 2, a mobile terminal apparatus according to an embodiment of the present invention communicates with a wireless LAN unit 1 that performs communication on a wireless LAN communication network (not shown) and a public mobile communication network (not shown). And a cellular unit 2 to be executed.

  The cellular unit 2 has a location registration information management unit 21 that manages information for notifying the public mobile communication network of the location information of the mobile terminal device. That is, when the location registration information for circuit switching managed by the public mobile communication network is changed, the location registration information management unit 21 uses the circuit switching location registration information 213 called “Location Area Update” for public mobile communication. Notify the network.

  In addition, when the location registration information for packet exchange managed by the public mobile communication network is changed, the location registration information management unit 21 transmits the packet exchange location registration information 211 called “Routing Area Update” to the public mobile communication. Notify the network.

  Further, in “Routing Area Update”, the location registration information of the mobile terminal device is notified to the public mobile communication network for each periodic location registration timer set for each carrier. When the location registration information is notified by the periodic location registration timer, the location registration information comparison unit 212 compares the notified location registration information with the location registration information at the previous notification, and determines the change of the registration information. deep.

  Furthermore, when the circuit switching location registration information 213 and the packet switching location registration information 211 when the base station is changed are notified to the public mobile communication network, or the location registration information comparison unit 212 updates the information. Information is sent to the scan determination unit 11 of the wireless LAN unit 1.

  The wireless LAN unit 1 holds the belonging state as the connection state information 14. When the wireless LAN out-of-service state is held as the connection state information 14, the scan determination unit 11 determines whether to switch the scan interval. judge. The scan interval switching unit 12 switches which scan interval between the normal scan interval 121 and the position registration scan interval 122 is used based on the determination result of the scan determination unit 11. Further, the scan execution unit 13 performs a scan according to the scan interval switched by the scan interval switching unit 12.

  FIG. 3 is a diagram showing the scan timing at the normal scan interval 121 and the scan timing at the position registration scan interval 122 of FIG. In FIG. 3, the scan timing at the normal scan interval 121 indicating the scan interval in the normal wireless LAN held in the scan interval switching unit 12 and the scan timing at the location registration scan interval 122 using the public mobile communication network are shown. An example is shown.

  In the normal scan interval 121 in a normal wireless LAN, there is a premise that it can belong within a company or home. Therefore, when the wireless LAN network is out of service area due to the distance from the access point, the presence or absence of an obstruction, etc., first, scanning is performed several times at a short interval Ta1, and then several at an interval Ta2 where “Ta1 <Ta2”. The scan is performed once, and the scan is further performed at an interval Ta3 where “Ta2 <Ta3”.

  For example, it is assumed that the scan interval increases every elapse of a certain time, such as 2 seconds for the interval Ta1, 10 seconds for the interval Ta2, and 30 seconds for the interval Ta3. In this case, there is also a method of preventing the scan interval from becoming too long by setting the scan interval maximum value in advance and returning it to the initial value when the scan interval reaches the scan interval maximum value.

  When the location registration scan interval 122 does not know where the wireless LAN network is, the circuit switching location registration information 213 and the packet switching location registration information 211 when the base station is changed are notified to the public mobile communication network Alternatively, when the location registration information comparison unit 212 determines that the information is updated, the scan timing needs to be returned to the initial value, and further, the scan is performed at the location registration scan interval to quickly connect to the wireless LAN system network.

  In the example shown in FIG. 3, scanning is performed several times at a short interval Tb1, and thereafter, scanning is performed at an interval Tb2 that satisfies “Tb1 << Tb2”. For example, if you are traveling by train and a wireless LAN system is configured at the station, it is necessary to scan quickly when you approach the station and be able to connect to the wireless LAN system. If it is not possible to connect to the wireless LAN system, it can be determined that there is no environment that can be connected to the periphery.

  Therefore, the number of scans can be reduced by setting the position registration scan interval 122 to a long scan interval. Thereby, in this Embodiment, the wake time of a mobile terminal device can be shortened by switching to the position registration scan interval 122 by position registration information, and a power saving effect can be expected.

  4 is a flowchart showing wireless LAN management by the wireless LAN unit 1 of FIG. 2, FIG. 5 is a flowchart showing scan control using the normal scan interval 121 of FIG. 3, and FIG. 6 is a location registration scan of FIG. 10 is a flowchart showing scan control using an interval 122. When the operation of the wireless LAN unit 1 shown in FIG. 2 is realized by the CPU (central processing unit) of the mobile terminal device executing the program, the processing shown in FIGS. 4 to 6 is executed by the CPU. It is realized with.

  When performing wireless LAN management, the wireless LAN unit 1 retains the belonging state as connection state information 14 (step S1 in FIG. 4). When the wireless LAN unit 1 holds the out-of-service state of the wireless LAN as the connection state information 14 (step S2 in FIG. 4), the scan determination unit 11 determines whether to switch the scan interval (step S3 in FIG. 4). ).

  When the result of the scan determination unit 11 is the normal scan interval 121 (step S4 in FIG. 4), the wireless LAN unit 1 switches the scan interval switching unit 12 to the normal scan interval 121 in the normal wireless LAN (step S5 in FIG. 4). .

  When the result of the scan determination unit 11 is the location registration scan interval 122 (step S4 in FIG. 4), the wireless LAN unit 1 uses the scan interval switching unit 12 to receive information from the location registration information management unit 212 using the public mobile communication network. The position is switched to the position registration scan interval 122 determined in step (step S6 in FIG. 4).

  In the wireless LAN unit 1, the scan execution unit 13 performs scanning according to the scan interval (normal scan interval 121 or position registration scan interval 122) switched as described above by the scan interval switching unit 12 (step in FIG. 4). S7).

  In the wireless LAN unit 1, when performing scan control using the normal scan interval 121, if the out-of-service state of the wireless LAN is held as the connection state information 14 (step S11 in FIG. 5), the interval Ta1 having a shorter normal scan interval 121 is set. The scan is performed several times (step S12 in FIG. 5).

  Subsequently, the wireless LAN unit 1 scans several times at an interval Ta2 where “Ta1 <Ta2” (step S13 in FIG. 5), and further performs a scan at an interval Ta3 where “Ta2 <Ta3” (step 5 in FIG. 5). S14).

  In the wireless LAN unit 1, the scan is performed as described above, and when the scan interval at which the scan is performed reaches the set scan interval maximum value (step S15 in FIG. 5), the scan interval is returned to the initial value (step in FIG. 5). S16).

  Next, in the wireless LAN unit 1, when performing the scan control using the location registration scan interval 122, it is not known where the wireless LAN network is. Therefore, the circuit switching location registration information 213 and the base station change are not included in the public mobile communication network. If the packet exchange location registration information 211 is notified (step S21 in FIG. 6), or the location registration information comparison unit 212 determines that the information is updated (step S22 in FIG. 6), the scan interval is set to the initial value. Return (step S23 in FIG. 6).

  Thereafter, the wireless LAN unit 1 performs scanning at the position registration scanning interval 122 (step S24 in FIG. 6). First, scanning is performed several times at a short interval Tb1 (step S25 in FIG. 6), and “Tb1 << Tb2” is satisfied. A scan is performed at a long interval Tb2 (step S26 in FIG. 6).

  As described above, in this embodiment, in a wireless LAN system in an environment in which a public mobile communication network and a wireless LAN communication network coexist, a wireless LAN network is used by utilizing the notification timing of location registration information in the public mobile communication network. When scanning is performed, the scan is performed in a short time immediately after the start of the scan, and if the connection to the wireless LAN system cannot be established, the scan interval is increased, and the scan interval is switched to a scan interval different from the normal scan interval. Thereby, in this Embodiment, the wake time of the wireless LAN part 1 can be shortened and power saving can be achieved.

  The present invention can be applied to the field of public wireless LANs, particularly the field of portable mobile terminals that are considered to have a large effect on power consumption.

DESCRIPTION OF SYMBOLS 1 Wireless LAN part 2 Cellular part 11 Scan determination part 12 Scan interval switching part 13 Scan execution part 14 Connection state information 21 Location registration information management part 121 Normal scan interval 122 Position registration scan interval 211 Packet exchange position registration information 212 Position registration information comparison Part 213 Circuit switching location registration information

Claims (12)

  1. A mobile terminal device connectable to both a public mobile communication network and a wireless LAN (Local Area Network) communication network,
    Scan determination means for performing a wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
    The have a scan interval switching means for switching to a different scan interval from the usual normal scan interval of the wireless LAN when it is determined by the scan determining means and the update of the location registration information,
    The mobile terminal apparatus characterized in that the scan interval switching means performs a scan immediately after the start of scanning, takes a longer scan interval when the wireless LAN system cannot be connected, and switches to a scan interval different from the normal scan interval .
  2. When the scan for updating the location registration information is performed several times at a short interval Tb1 immediately after the start of the scan and cannot be connected to the wireless LAN system , the scan is performed at a long interval Tb2 where Tb1 << Tb2. The mobile terminal apparatus according to claim 1, wherein:
  3.   The scan interval switching means includes the normal scan interval, the position registration information notified immediately before from the own apparatus to the public mobile communication network in the packet exchange position registration updated for each periodic position registration timer, and the position registration information of the previous state The mobile terminal apparatus according to claim 1 or 2, wherein a position registration scan interval indicating a scan interval determined by a comparison result of a comparison means for comparing is switched.
  4. When the wireless LAN scan is performed using the notification timing of the location registration information in the public mobile communication network, the location registration scan interval is scanned several times at a short interval Tb1 immediately after the start of the scan, The mobile terminal apparatus according to claim 3 , wherein when the wireless LAN system cannot be connected, the scan is performed at a long interval Tb2 where Tb1 << Tb2 .
  5.   5. The mobile terminal apparatus according to claim 3, wherein the wireless LAN is not scanned when there is no location registration update in the comparison result of the comparison means.
  6.   A wireless LAN system comprising the mobile terminal device according to any one of claims 1 to 5.
  7. A wireless LAN scan interval switching method used for a mobile terminal device connectable to both a public mobile communication network and a wireless LAN (Local Area Network) communication network,
    The mobile terminal device
    Scan determination processing for performing wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
    A scan interval switching process for switching to a scan interval different from a normal normal scan interval of the wireless LAN when it is determined that the location registration information is updated in the scan determination process ;
    In the scan interval switching process, the scan is performed in a short time immediately after the start of scanning, and when the wireless LAN system cannot be connected, the scan interval is increased and the scan interval is switched to a scan interval different from the normal scan interval. A wireless LAN scan interval switching method.
  8. When the scan for updating the location registration information is performed several times at a short interval Tb1 immediately after the start of the scan and cannot be connected to the wireless LAN system , the scan is performed at a long interval Tb2 where Tb1 << Tb2. The wireless LAN scan interval switching method according to claim 7, wherein:
  9.   In the scan interval switching process, the location registration information and the previous state location registration information immediately notified from the own device to the public mobile communication network in the packet scan location registration updated at each periodic location registration timer in the normal scan interval The wireless LAN scan interval switching method according to claim 7 or 8, wherein a position registration scan interval indicating a scan interval determined by a comparison result of a comparison process is switched.
  10. The location registration scan interval is several times at a short interval Tb1 during a short time immediately after the start of the scan when scanning of the wireless LAN is performed using the notification timing of location registration information in the public mobile communication network. 10. The wireless LAN scan interval switching method according to claim 9, wherein when a scan is performed and the wireless LAN system cannot be connected , the scan is performed at a long interval Tb <b> 2 where Tb <b> 1 << Tb <b> 2 .
  11.   11. The wireless LAN scan interval switching method according to claim 9, wherein scanning of the wireless LAN is not performed when there is no location registration update in the comparison result of the comparison processing.
  12. A program executed by a central processing unit in a mobile terminal device connectable to both a public mobile communication network and a wireless LAN (Local Area Network) communication network,
    Scan determination processing for performing wireless LAN scan determination at a notification timing for notifying the public mobile communication network of location registration information;
    The saw including a scan interval switching process of switching to a different scan interval from the usual normal scan interval of the wireless LAN when it is determined by scanning the determination process and the update of the location registration information,
    In the scan interval switching process, scanning is performed during a short time immediately after the start of scanning, and when the wireless LAN system cannot be connected, the scan interval is increased and the scan interval is switched to a scan interval different from the normal scan interval. A featured program.
JP2009029237A 2009-02-12 2009-02-12 Mobile terminal apparatus, wireless LAN system, and wireless LAN scan interval switching method used therefor Expired - Fee Related JP5278018B2 (en)

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KR101796589B1 (en) * 2011-03-28 2017-11-10 삼성전자 주식회사 METHOD AND APPARATUS FOR REDUCING POWER CONSUMPTION OF Wi-Fi DEVICE
CN102316555A (en) * 2011-09-19 2012-01-11 华为终端有限公司 Method for scanning wireless fidelity (WiFi) network by mobile terminal and mobile terminal adopting method
JP5883293B2 (en) 2012-01-06 2016-03-09 任天堂株式会社 Communication system, communication device, communication program, and communication method
JP5891036B2 (en) 2012-01-06 2016-03-22 任天堂株式会社 Communication system, communication device, communication program, and communication method
JP5891037B2 (en) 2012-01-06 2016-03-22 任天堂株式会社 Communication system, communication device, communication program, and communication method
JP5881651B2 (en) * 2013-07-31 2016-03-09 ビッグローブ株式会社 Information processing apparatus, communication management method, and program
JPWO2017216952A1 (en) * 2016-06-17 2019-04-18 オリンパス株式会社 First wireless communication terminal, second wireless communication terminal, wireless communication system, wireless communication method, and program

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JP4735022B2 (en) * 2005-04-27 2011-07-27 日本電気株式会社 Wireless LAN terminal, wireless LAN terminal scanning operation method, and scanning operation program
JP4920999B2 (en) * 2006-03-14 2012-04-18 Necエンジニアリング株式会社 Portable terminal device and control method thereof
CN101485221B (en) * 2006-07-14 2012-06-06 日本电气株式会社 Base station search method by means of radio terminal and radio terminal
JP2008067183A (en) * 2006-09-08 2008-03-21 Toshiba Corp Radio communication terminal
JP4944627B2 (en) * 2007-01-25 2012-06-06 Necカシオモバイルコミュニケーションズ株式会社 Wireless communication system, mobile communication terminal, connection information providing apparatus, and program
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