JPH06351058A - Mobile communication device - Google Patents

Mobile communication device

Info

Publication number
JPH06351058A
JPH06351058A JP5141934A JP14193493A JPH06351058A JP H06351058 A JPH06351058 A JP H06351058A JP 5141934 A JP5141934 A JP 5141934A JP 14193493 A JP14193493 A JP 14193493A JP H06351058 A JPH06351058 A JP H06351058A
Authority
JP
Japan
Prior art keywords
electric field
mobile station
base station
field level
received electric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5141934A
Other languages
Japanese (ja)
Inventor
Sunao Aoki
青木  直
Hiroaki Hayashi
弘章 林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP5141934A priority Critical patent/JPH06351058A/en
Publication of JPH06351058A publication Critical patent/JPH06351058A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0225Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2250/00Details of telephonic subscriber devices
    • H04M2250/12Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0251Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
    • H04W52/0254Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity detecting a user operation or a tactile contact or a motion of the device
    • 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 THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To regulate the location registration operation when a mobile station does not move and to prevent the wasteful power consumption of the mobile station by providing a means detecting a moving on the mobile station, regarding the location registration to a base station in accordance with the zone shifting of the mobile station in a mobile communication device. CONSTITUTION:The moving detection of a mobile station is performed in a vibration detection part 11. A received electric field level measuring part 12 measures the received electric field level of the signal from a base station where a mobile station is registered at present. As for the signal from each base station, the received electric field level is measured in a received electric field level measuring part 13. In a moving control part 14, the presence or absence of the moving of the mobile station is discriminated based on the information from the vibration detection part 11 and the time when the moving is not performed is specified. Based on the information from the received electric field level measuring part 12 and the received electric field level measuring part 13, the base station where the received electric field level is the largest is discriminated and the self-zone of the mobile station is specified. By controlling the above information, a location registration and a location registration regulation are performed in the moving control part.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、移動体の位置登録に係
る移動体通信装置に関し、より詳細には、移動局のゾー
ン移行に伴う基地局への位置登録に関して、移動局に移
動を検出する手段を設けることで、移動局が移動を行っ
ていない際の位置登録動作を規制し、移動局の電力の浪
費を防ぐようにした移動体通信装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device relating to location registration of a mobile body, and more specifically, to the location registration to a base station due to zone shift of the mobile station, detecting movement to the mobile station. The present invention relates to a mobile communication device in which the position registration operation when the mobile station is not moving is regulated by providing the means for preventing the power consumption of the mobile station.

【0002】[0002]

【従来の技術】移動局の送信電力で充分に通信可能な複
数の基地局でサービスエリアを構成し、基地局とサービ
スエリア内の移動を許容する移動局との無線通信を行う
移動体通信装置において、移動局が移動を伴う場合に
は、現在登録されている基地局からの信号の受信電界レ
ベルは変動し、特に、現在登録されている基地局のゾー
ン(自ゾーン)から周辺ゾーンに移行する際には受信レ
ベルは劣化して通信不可能な状態になる。前述したよう
な状況を未然に防ぎ、サービスエリア内での移動通信を
可能にするには、移動局は移行するゾーンの識別とその
基地局への位置登録が必要になる。
2. Description of the Related Art A mobile communication apparatus which forms a service area with a plurality of base stations capable of sufficiently communicating with the transmission power of a mobile station and performs wireless communication between the base station and a mobile station which permits movement within the service area. When the mobile station moves, the received electric field level of the signal from the currently registered base station fluctuates, and in particular, the zone (own zone) of the currently registered base station moves to the surrounding zone. When doing so, the reception level deteriorates and communication becomes impossible. In order to prevent the above-mentioned situation and enable mobile communication within the service area, the mobile station needs to identify the zone to be moved and register its location with the base station.

【0003】そのため移動局は、自ゾーンの基地局から
の信号の受信電界レベルを常に管理し、その受信電界レ
ベルがしきい値を下まわった時にゾーン移行を識別す
る。次に移動局は周辺ゾーンの他基地局の信号を探索
し、それらの受信電界レベルの測定を行い、各基地局か
らの信号の受信電界レベルを比較して最も受信レベルが
大きい基地局のゾーンを次の自ゾーンであると判断し、
その基地局に位置登録を要求する。以上が位置登録を行
うまでの従来の手順である。
Therefore, the mobile station constantly manages the received electric field level of the signal from the base station in its own zone, and identifies the zone transition when the received electric field level falls below the threshold value. Next, the mobile station searches for signals from other base stations in the surrounding zones, measures their received electric field levels, compares the received electric field levels of the signals from each base station, and compares the received electric field levels to the zone of the base station with the highest received level. Is the next own zone,
Request location registration from the base station. The above is the conventional procedure until position registration.

【0004】[0004]

【発明が解決しようとする課題】前述のように、従来の
移動体通信装置における移動局のゾーン移行に伴う基地
局への位置登録は前述した手順をとっているが、ここで
移動局の電力が有限な物であるという点から前述した位
置登録までの手順を考えてみると、現在登録されている
基地局からの信号の受信電界レベルの測定は、基地局か
らの着信通知を周期的に受信する必要があり、それと併
せて実行できるので問題は無いが、他基地局からの信号
の受信電界レベルの測定のためには、連続して受信機を
動作させる必要があり、移動局の電力の浪費という点で
問題があった。
As described above, the conventional mobile communication apparatus uses the procedure described above to register the location with the base station when the mobile station moves to the zone. Considering the procedure up to the location registration described above from the fact that is a finite object, the measurement of the received electric field level of the signal from the currently registered base station is carried out by periodically notifying the incoming call from the base station. There is no problem because it needs to be received and can be executed together with it, but in order to measure the received electric field level of the signal from another base station, it is necessary to operate the receiver continuously and the power of the mobile station. There was a problem in terms of waste of money.

【0005】本発明は、このような実情に鑑みてなされ
たもので、移動局が他基地局からの信号を探索し、該信
号の受信電界レベルを測定するという動作を必要に応じ
て行い、位置登録に伴う信号の送受信を極力少ない回数
で成就する移動局を備えた移動体通信装置を提供するこ
とを目的としている。
The present invention has been made in view of such a situation, and the mobile station searches for a signal from another base station and measures the received electric field level of the signal, if necessary. It is an object of the present invention to provide a mobile communication device including a mobile station that achieves the transmission and reception of signals associated with position registration with the least number of times.

【0006】[0006]

【課題を解決するための手段】本発明は、上記目的を達
成するために、移動局(携帯端末)の送信電力で通信可
能な複数の基地局でサービスエリアを構成し、前記基地
局とサービスエリア内の移動を許容する前記移動局との
無線通信を、前記基地局の中の1つ、もしくは一部の基
地局に前記移動局を位置登録することで移動管理を行う
移動体通信装置において、前記移動局に移動を検出する
移動検出手段と、現在登録されている基地局からの信号
の受信電界レベルを測定する第1の測定手段と、各基地
局からの信号を探索し、該信号の受信電界レベルを測定
する第2の測定手段と、現在登録されている基地局から
の信号の受信電界レベルと各基地局からの信号の受信電
界レベルを比較する比較手段とを備えることを特徴とし
たものである。
In order to achieve the above object, the present invention configures a service area with a plurality of base stations capable of communicating with the transmission power of a mobile station (portable terminal), and provides a service with the base station. In a mobile communication device that performs wireless communication with the mobile station that permits movement within an area, by performing the mobile management by registering the mobile station in one of the base stations or a part of the base stations. , A movement detecting means for detecting movement to the mobile station, a first measuring means for measuring a received electric field level of a signal from a currently registered base station, a signal from each base station, and searching the signal. And second comparing means for measuring the received electric field level of the signal from the currently registered base station and comparing means for comparing the received electric field level of the signal from the currently registered base station with the received electric field level of the signal from each base station. It is what

【0007】[0007]

【作用】上述した構成を有する移動体通信装置では、移
動局の移動を検出する移動検出手段において、移動の有
無を識別し、移動を行っていない時間を特定する。ま
た、移動局が現在登録されている基地局からの信号の受
信電界レベルを測定する手段と、各基地局からの信号を
探索し、それらの受信電界レベルを測定する手段と、現
在登録されている基地局からの信号の受信電界レベルと
各基地局からの信号の受信電界レベルを比較する機能に
おいて、どの基地局からの信号が最も受信レベルが大き
いかを識別し、移動局の自ゾーンを特定する。以上の手
段により移動局が移動を行っていない際の位置登録の規
制をかけることができる。
In the mobile communication device having the above-mentioned structure, the movement detecting means for detecting the movement of the mobile station identifies the presence or absence of movement and specifies the time during which no movement is performed. Also, means for measuring the reception electric field level of the signal from the base station in which the mobile station is currently registered, means for searching the signal from each base station, and measuring those reception electric field levels, are currently registered. In the function to compare the received electric field level of the signal from the base station with the received electric field level of the signal from each base station, identify which base station has the highest received level, and identify the mobile station's own zone. Identify. By the above means, the position registration can be restricted when the mobile station is not moving.

【0008】[0008]

【実施例】実施例について、図面を参照して以下に説明
する。図1は、本発明による移動体通信装置の一実施例
を説明するための構成図で、移動局移動管理部のブロッ
ク図である。図中、11は移動検出を行う振動検出部、
12は現在登録されている基地局からの信号の受信電界
レベル測定部、13は各基地局からの信号の受信電界レ
ベル測定部、14は振動検出部11,レベル測定部1
2,13からの情報を基に位置登録に伴う信号の送受信
の制御を行う移動管理部である。
Embodiments will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of a mobile communication device according to the present invention, and is a block diagram of a mobile station mobility management unit. In the figure, 11 is a vibration detector for detecting movement,
Reference numeral 12 is a reception electric field level measuring unit for a signal from a currently registered base station, 13 is a reception electric field level measuring unit for a signal from each base station, 14 is a vibration detecting unit 11, and a level measuring unit 1.
The mobility management unit controls transmission / reception of signals associated with location registration based on information from 2 and 13.

【0009】移動検出を行う振動検出部11からの情報
を基に、移動管理部14では移動局の移動に関する状
態、現在移動中であるか、停止しているかの管理を行
う。この際、移動管理部14では振動検出部11より送
られてくる振動信号の連続性により移動の有無を識別す
る。現在登録されている基地局からの信号の受信電界レ
ベル測定部12では、常に周期的に基地局より送られて
くる信号の受信電界レベルを測定し、その情報を移動管
理部14に送る。該移動管理部14ではその情報を管理
し、充分に通信可能な受信レベルであるかの判断を行
う。各基地からの信号の受信電界レベル測定部13では
各基地局からの信号を探索し、それらの受信電界レベル
を測定し、その情報を移動管理部14に送る。該移動管
理部14ではその情報を管理し、最も受信電界レベルの
大きい基地局の識別を行う。また、前記移動管理部14
では上記の情報を基に位置登録を行う。
On the basis of the information from the vibration detecting section 11 which detects the movement, the movement managing section 14 manages the state regarding the movement of the mobile station, whether it is currently moving or stopped. At this time, the movement management unit 14 identifies the presence / absence of movement based on the continuity of the vibration signal sent from the vibration detection unit 11. The reception electric field level measuring unit 12 of the signal from the currently registered base station constantly measures the reception electric field level of the signal transmitted from the base station, and sends the information to the mobility management unit 14. The movement management unit 14 manages the information and determines whether the reception level is sufficient for communication. The reception electric field level measuring unit 13 for signals from each base searches for signals from each base station, measures the reception electric field levels thereof, and sends the information to the mobility control unit 14. The movement management unit 14 manages the information and identifies the base station having the highest received electric field level. In addition, the movement management unit 14
Then, location registration is performed based on the above information.

【0010】図2は、本発明による移動体通信装置にお
ける移動局移動管理部の位置登録のフローチャートを示
す図である。以下、各ステップに従って順に説明する。step1 ;まず、移動管理部14では振動検出部11から
の情報を基に移動局の移動に関する状態を特定する。step2 ;次に、移動管理部14は移動局が移動していな
ければ現状維持とし、現在登録されている基地局からの
信号の受信電界レベルに関係なく、振動検出部11から
の振動検出の信号を待つ状態になる。step3 ;一方、移動局が移動中であると判断した場合に
は、移動管理部14では現在登録されている基地局から
の信号の受信電界レベルを確認する。step4 ;次に、その値が受信電界レベルのしきい値に対
して充分な値であるかどうかの判断を行う。step5 ;次に、移動管理部14が充分な値であると判断
した場合には最初の前記step1に戻り、以下同じ手順を
繰り返す。移動管理部14が受信電界レベルのしきい値
を下まわっていると判断した場合には、各基地局からの
信号の受信電界レベル測定部13に各基地局からの信号
を探索させ、それらの受信電界レベルを測定させる。step6 ;次に、移動管理部ではその情報を基に最も受信
電界レベルの大きい基地局を識別する。step7 ;最後に、その基地局に位置登録を要求する。
FIG. 2 is a diagram showing a flow chart of location registration of the mobile station mobility management unit in the mobile communication device according to the present invention. Hereinafter, each step will be described in order. step1 ; First, the mobility management unit 14 identifies a state related to the movement of the mobile station based on the information from the vibration detection unit 11. step2 ; Next, the mobility management unit 14 maintains the current state if the mobile station is not moving, and the vibration detection signal from the vibration detection unit 11 is irrespective of the received electric field level of the signal from the currently registered base station. Will be waiting for you. step3 ; On the other hand, when it is determined that the mobile station is moving, the mobility management unit 14 confirms the received electric field level of the signal from the currently registered base station. step4 ; Next, it is judged whether or not the value is a sufficient value for the threshold value of the received electric field level. step5 ; Next, when the movement management unit 14 determines that the value is sufficient, the process returns to the first step 1 and the same procedure is repeated. When the mobility management unit 14 determines that the received electric field level is below the threshold value, the received electric field level measuring unit 13 for the signal from each base station searches for the signal from each base station, and Measure the received electric field level. step6 ; Next, the mobility management unit identifies the base station having the highest received electric field level based on the information. step7 ; Finally, request the location registration to the base station.

【0011】[0011]

【発明の効果】以上の説明から明らかなように、本発明
によると、以下のような効果がある。すなわち、移動局
に移動を検出する移動検出手段と、現在登録されている
基地局からの信号の受信電界レベルを測定する手段と、
各基地局の信号を探索し、それらの受信電界レベルを測
定する手段と、現在登録されている基地局からの信号の
受信電界レベルと各基地局からの信号の受信電界レベル
を比較する機能とを備えているので、振動検出部で連続
した振動が検出されない場合、すなわち移動局が移動を
行っていない状態にあると判断される場合には、移動管
理部では次回振動検出部から振動検出の信号を受信し、
移動局が移動を行っていると判断するまで、位置登録に
伴う信号の送受信を行う必要が無く、移動局の電力の消
費を削減できる。
As is apparent from the above description, the present invention has the following effects. That is, movement detection means for detecting movement to the mobile station, means for measuring the received electric field level of the signal from the currently registered base station,
A means for searching the signals of each base station and measuring their reception electric field levels, and a function of comparing the reception electric field level of the signal from the currently registered base station with the reception electric field level of the signal from each base station. Therefore, if continuous vibration is not detected by the vibration detection unit, that is, if it is determined that the mobile station is not moving, the mobility management unit detects the vibration from the next vibration detection unit. Receive the signal,
Until the mobile station determines that it is moving, it is not necessary to send and receive signals associated with location registration, and power consumption of the mobile station can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明による移動体通信装置の一実施例を説明
するための構成図で、移動局移動管理部ブロック図あ
る。
FIG. 1 is a configuration diagram for explaining an embodiment of a mobile communication device according to the present invention and is a block diagram of a mobile station mobility management unit.

【図2】本発明による移動体通信装置の移動局の位置登
録を行う手順のフローチャートである。
FIG. 2 is a flowchart of a procedure for performing location registration of a mobile station of a mobile communication device according to the present invention.

【符号の説明】[Explanation of symbols]

11…移動検出を行う振動検出部、12…現在登録され
ている基地局からの信号の受信電界レベル測定部、13
…各基地局からの信号の受信電界レベル測定部、14…
振動検出部11,レベル測定部12,13からの情報を
基に位置登録に伴う信号の送受信の制御を行う移動管理
部。
11 ... Vibration detecting unit for detecting movement, 12 ... Received electric field level measuring unit for signals from currently registered base stations, 13
... Received electric field level measuring unit for signals from each base station, 14 ...
A movement management unit that controls transmission / reception of signals associated with position registration based on information from the vibration detection unit 11 and the level measurement units 12 and 13.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 移動局の送信電力で通信可能な複数の基
地局でサービスエリアを構成し、前記基地局とサービス
エリア内の移動を許容する前記移動局との無線通信を、
前記基地局の中の1つ、もしくは一部の基地局に前記移
動局を位置登録することで移動管理を行う移動体通信装
置において、前記移動局に移動を検出する移動検出手段
と、現在登録されている基地局からの信号の受信電界レ
ベルを測定する第1の測定手段と、各基地局からの信号
を探索し、該信号の受信電界レベルを測定する第2の測
定手段と、現在登録されている基地局からの信号の受信
電界レベルと各基地局からの信号の受信電界レベルを比
較する比較手段とを備えることを特徴とする移動体通信
装置。
1. A radio communication between a base station and a mobile station which permits movement within the service area, the service area being composed of a plurality of base stations capable of communicating with the transmission power of the mobile station.
In a mobile communication device that performs mobility management by registering the location of the mobile station in one or some of the base stations, movement detection means for detecting movement in the mobile station, and current registration. First measuring means for measuring the received electric field level of the signal from the base station, second measuring means for searching the signal from each base station and measuring the received electric field level of the signal, and the present registration A mobile communication device, comprising: a comparing unit that compares a received electric field level of a signal from a base station and a received electric field level of a signal from each base station.
JP5141934A 1993-06-14 1993-06-14 Mobile communication device Pending JPH06351058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5141934A JPH06351058A (en) 1993-06-14 1993-06-14 Mobile communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5141934A JPH06351058A (en) 1993-06-14 1993-06-14 Mobile communication device

Publications (1)

Publication Number Publication Date
JPH06351058A true JPH06351058A (en) 1994-12-22

Family

ID=15303550

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5141934A Pending JPH06351058A (en) 1993-06-14 1993-06-14 Mobile communication device

Country Status (1)

Country Link
JP (1) JPH06351058A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0812119A2 (en) * 1996-05-23 1997-12-10 Nokia Mobile Phones Ltd. Mobile station having enhanced standby mode
EP0833537A2 (en) * 1996-09-27 1998-04-01 Matsushita Electric Industrial Co., Ltd. A mobile telephone apparatus with power saving
US6144858A (en) * 1999-09-13 2000-11-07 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal apparatus with reception level measurement control
JP2002171356A (en) * 2000-12-01 2002-06-14 Toyo Keiki Co Ltd Automatic meter-reading system using phs
KR20040049900A (en) * 2002-12-05 2004-06-14 엘지전자 주식회사 Apparatus and Method for Saving Power of Mobile Communication Terminal
KR100623400B1 (en) * 1998-03-31 2006-09-13 코닌클리케 필립스 일렉트로닉스 엔.브이. Radio range verification method, wireless telecommunications equipment implementing this method, base station and mobile handset of such equipment
WO2009011299A1 (en) * 2007-07-18 2009-01-22 Nec Corporation Mobile telephone device, channel search method, and program

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0812119A2 (en) * 1996-05-23 1997-12-10 Nokia Mobile Phones Ltd. Mobile station having enhanced standby mode
EP0833537A2 (en) * 1996-09-27 1998-04-01 Matsushita Electric Industrial Co., Ltd. A mobile telephone apparatus with power saving
EP0833537A3 (en) * 1996-09-27 1999-08-11 Matsushita Electric Industrial Co., Ltd. A mobile telephone apparatus with power saving
KR100623400B1 (en) * 1998-03-31 2006-09-13 코닌클리케 필립스 일렉트로닉스 엔.브이. Radio range verification method, wireless telecommunications equipment implementing this method, base station and mobile handset of such equipment
US6144858A (en) * 1999-09-13 2000-11-07 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal apparatus with reception level measurement control
WO2001020936A1 (en) * 1999-09-13 2001-03-22 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal
JP2002171356A (en) * 2000-12-01 2002-06-14 Toyo Keiki Co Ltd Automatic meter-reading system using phs
KR20040049900A (en) * 2002-12-05 2004-06-14 엘지전자 주식회사 Apparatus and Method for Saving Power of Mobile Communication Terminal
WO2009011299A1 (en) * 2007-07-18 2009-01-22 Nec Corporation Mobile telephone device, channel search method, and program
JP2009027347A (en) * 2007-07-18 2009-02-05 Nec Saitama Ltd Mobile telephone device, and its channel search method and program
US8340650B2 (en) 2007-07-18 2012-12-25 Nec Corporation Mobile phone device, and its channel search method and program

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