JP3196634B2 - Wireless mobile terminal - Google Patents
Wireless mobile terminalInfo
- Publication number
- JP3196634B2 JP3196634B2 JP04718596A JP4718596A JP3196634B2 JP 3196634 B2 JP3196634 B2 JP 3196634B2 JP 04718596 A JP04718596 A JP 04718596A JP 4718596 A JP4718596 A JP 4718596A JP 3196634 B2 JP3196634 B2 JP 3196634B2
- Authority
- JP
- Japan
- Prior art keywords
- base station
- mobile terminal
- control signal
- electric field
- position information
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、位置情報検出シス
テムに使用される無線移動端末（以下、移動端末と称す
る）に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio mobile terminal (hereinafter, referred to as a mobile terminal) used in a position information detection system.
【０００２】[0002]
【従来の技術】自動車電話や携帯電話、パーソナル・ハ
ンディホン・システム（以下、ＰＨＳと称する）のよう
な、複数の無線ゾーンで全体のエリアを構成する移動体
通信システムにおいて、基地局の無線ゾーンが重なりを
持つという特徴を活かし、移動端末周辺の複数の基地局
の制御信号の受信電界強度から、エリア内に存在する移
動端末の位置を無線ゾーン単位よりも高精度に検出す
る、位置情報検出システムは、例えば特公平６−９３６
５０号公報などに記載されたものが知られている。2. Description of the Related Art In a mobile communication system such as an automobile telephone, a mobile telephone, and a personal handy phone system (hereinafter, referred to as a PHS), a plurality of wireless zones constitute an entire area. Utilizing the feature that there is overlap, from the received electric field strength of the control signals of multiple base stations around the mobile terminal, the position of the mobile terminal existing in the area is detected with higher accuracy than the wireless zone unit, position information detection The system is, for example, Japanese Patent Publication No. 6-936.
No. 50 is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来例では、位置管理局からの移動端末への位置情報送出
の要求がどの時点で発生するかを、移動端末では予測で
きないため、移動端末で待機時などに事前に周辺の基地
局の制御信号の受信電界強度を測定しておくか、もしく
は、通信状態が確立した後に周辺基地局の制御信号を受
信する必要がある。However, in the above-mentioned conventional example, it is not possible to predict at what time the position management station requests the transmission of the position information to the mobile terminal. It is necessary to measure the received electric field strength of the control signal of the peripheral base station beforehand at the time, or to receive the control signal of the peripheral base station after the communication state is established.
【０００４】移動端末で、待機時などに事前に周辺の基
地局の制御信号の受信電界強度を測定しておく方式で
は、移動端末の消費電力の増大を招くという欠点があっ
た。また、通信状態が確立した後に周辺基地局の制御信
号を受信する方式では、移動端末の受信部として、通信
信号受信用と制御信号受信用との２系統の受信部を設け
る必要があり、移動端末の大型化、消費電力の増大、部
品点数の増加を招くという欠点があった。The method in which the mobile terminal measures in advance the received electric field strength of the control signal of the peripheral base station at the time of standby or the like has a disadvantage that the power consumption of the mobile terminal is increased. In the method of receiving a control signal of a peripheral base station after a communication state is established, it is necessary to provide two systems of receiving units, one for receiving a communication signal and the other for receiving a control signal, as a receiving unit of a mobile terminal. There is a drawback that the terminal becomes larger, the power consumption increases, and the number of components increases.
【０００５】本発明は、上記問題点を解決し、位置管理
局からの移動端末への位置情報送出の要求の着信があっ
た時点で即座に、周辺の基地局の制御信号の受信電界強
度測定を行ない、位置情報を位置管理局に伝送すること
が可能な無線移動端末を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and measures the reception electric field strength of a control signal of a peripheral base station immediately upon receiving a request for transmitting position information from a position management station to a mobile terminal. To provide a wireless mobile terminal capable of transmitting location information to a location management station.
【０００６】[0006]
【課題を解決するための手段】この課題を解決するため
に本発明は、位置情報送出要求を着信した後に、周辺に
存在する基地局の制御信号を受信し、前記制御信号に含
まれる前記基地局の識別符号と前記制御信号の受信電界
強度との対からなる位置情報を、前記記憶部に格納した
後、基地局との間で通信状態を確立し、前記記憶部に格
納された前記位置情報を通信相手方に伝送するように構
成したものである。SUMMARY OF THE INVENTION In order to solve this problem, according to the present invention, after receiving a position information transmission request, a control signal of a base station present in the vicinity is received, and the base station included in the control signal is received. After storing position information comprising a pair of a station identification code and a received signal strength of the control signal in the storage unit, establish a communication state with the base station, and store the position information stored in the storage unit. It is configured to transmit information to a communication partner.
【０００７】これにより、待機中、もしくは、通信状態
確立後に周辺の基地局の制御信号の電界強度測定をせず
に、位置情報を位置管理局に伝送することができる。[0007] Thus, it is possible to transmit the position information to the position management station during standby or after establishing the communication state, without measuring the electric field strength of the control signal of the peripheral base station.
【０００８】[0008]
【発明の実施の形態】本発明は、個々の基地局から送信
される識別符号を検出するＩＤ検出部と、個々の基地局
の受信電界強度を測定する電界強度測定部と、１つまた
は複数の基地局の識別符号、および前記基地局の制御信
号の受信電界強度からなる、１対または複数対の位置情
報を格納する記憶部と、前記位置情報を基地局への送信
信号に変換する送信信号生成部とを備えるようにしたも
のであり、位置情報送出要求を着信した後に、周辺に存
在する基地局の制御信号を受信し、前記制御信号に含ま
れる前記基地局の識別符号と前記制御信号の受信電界強
度との対からなる位置情報を、前記記憶部に格納した
後、基地局との間で通信状態を確立し、前記記憶部に格
納された前記位置情報を通信相手方に伝送するという作
用を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides an ID detecting section for detecting an identification code transmitted from each base station, an electric field strength measuring section for measuring a received electric field strength of each base station, A storage unit for storing one or more pairs of position information comprising the identification code of the base station and the received electric field strength of the control signal of the base station, and transmission for converting the position information into a transmission signal to the base station A signal generation unit, and after receiving a position information transmission request, receive a control signal of a base station present in the vicinity, and receive an identification code of the base station included in the control signal and the control signal. After storing the position information comprising a pair with the received electric field strength of the signal in the storage unit, establish a communication state with the base station, and transmit the position information stored in the storage unit to a communication partner. It has the action of:
【０００９】移動端末は、位置管理局からの位置情報送
出要求を着信した時点で周辺の基地局の識別符号および
制御信号の受信電界強度の情報を検知して位置管理局に
送信するため、移動端末の不要な電力消費を防止し、移
動端末の長電池寿命化、小型化ができる。加えて、移動
端末は、位置管理局からの現在地検索要求に対して最新
の位置情報を提供できる。When the mobile terminal receives a position information transmission request from the position management station, the mobile terminal detects the identification code of the neighboring base station and information on the received signal strength of the control signal and transmits the information to the position management station. Unnecessary power consumption of the terminal can be prevented, and the mobile terminal can have a longer battery life and a smaller size. In addition, the mobile terminal can provide the latest location information in response to the current location search request from the location management station.
【００１０】以下、本発明の実施の形態について、図面
を用いて説明する。 （実施の形態１）図１は、移動体通信システムとしてＰ
ＨＳを利用した、位置情報検出システムの基地局と移動
端末および位置管理局の配置を示すブロック図である。
図２は、本発明の実施の形態による無線移動端末の構成
を示すブロック図である。An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG.
FIG. 2 is a block diagram illustrating the arrangement of a base station, mobile terminals, and a location management station of a location information detection system using HS.
FIG. 2 is a block diagram showing a configuration of the wireless mobile terminal according to the embodiment of the present invention.
【００１１】図１において、１は移動端末、２ａ、２
ｂ、２ｃ、……は移動端末１との間で通話や呼出エリア
の登録を行う基地局、３ａ、３ｂ、３ｃ、……は各基地
局２ａ〜２ｄの無線ゾーンであり、４は前記複数の無線
ゾーンで構成された一斉呼出エリア、５は一斉呼出エリ
ア内の移動端末１への回線接続制御を行う制御局、８は
前記基地局２ａ〜２ｄを介して移動端末１と送受信を行
う位置管理局である。In FIG. 1, 1 is a mobile terminal, 2a, 2
, are base stations 3a, 3b, 3c,... for registering a call and a calling area with the mobile terminal 1, and wireless zones of the base stations 2a to 2d. 5 is a control station for controlling line connection to the mobile terminal 1 in the paging area, and 8 is a position for transmitting and receiving to and from the mobile terminal 1 via the base stations 2a to 2d. It is a management station.
【００１２】基地局２ａ、２ｂ、２ｃ、……は制御局５
と電気通信回線設備６ａ、６ｂ、６ｃ、……で接続され
ている。７ａ、７ｂ、７ｃ、……は基地局２ａ、２ｂ、
２ｃ、……が移動端末１との呼接続を行うため、制御用
チャネルを用いて、周期的に送出する制御信号であり、
基地局毎に固有の識別符号、制御信号の構成を示す情
報、移動端末に対する着呼信号、移動端末に対する通信
用チャネルの割当を通知する信号などが含まれる。The base stations 2a, 2b, 2c,...
And telecommunication line facilities 6a, 6b, 6c,... 7a, 7b, 7c, ... are base stations 2a, 2b,
2c,... Are control signals periodically transmitted using a control channel in order to establish a call connection with the mobile terminal 1,
The information includes a unique identification code for each base station, information indicating the configuration of a control signal, an incoming call signal for a mobile terminal, a signal for notifying allocation of a communication channel to the mobile terminal, and the like.
【００１３】移動端末１は、制御局５が管理する一斉呼
出エリア４内にあり、制御局５に呼出エリアの登録を行
っている。また無線ゾーン３ａ、３ｂ、３ｃ、……には
重なりがあり、移動端末１は、基地局２ａ、２ｂ、２
ｃ、……からの制御信号７ａ、７ｂ、７ｃ、……を受信
可能な地点に位置している。図２において、２０はアン
テナ、２１は受信アンプ、２２は復調部、２３はＩＤ検
出部、２４は電界強度測定部、２５は制御部、２６は記
憶部、２７は送信信号生成部、２８は変調部、２９は送
信アンプである。The mobile terminal 1 is located in the general call area 4 managed by the control station 5 and registers the call area in the control station 5. Also, the wireless zones 3a, 3b, 3c,... Have overlaps, and the mobile terminal 1 has the base stations 2a, 2b, 2
are located at points where control signals 7a, 7b, 7c,. 2, reference numeral 20 denotes an antenna, 21 denotes a reception amplifier, 22 denotes a demodulation unit, 23 denotes an ID detection unit, 24 denotes an electric field strength measurement unit, 25 denotes a control unit, 26 denotes a storage unit, 27 denotes a transmission signal generation unit, and 28 denotes a transmission signal generation unit. The modulator 29 is a transmission amplifier.
【００１４】以上のように構成された位置情報検出シス
テムの動作について、以下、移動端末１と基地局２ａ、
２ｂ、２ｃ、……との間の無線区間の信号の流れ図を示
す図３を参照しながら詳細に説明する。移動端末１が位
置管理局８からの位置情報送出要求の着信を待っている
待機状態では、最寄りの基地局２ａが制御チャネルで周
期的に送信している制御信号７ａを受信する（図３の
（ａ））。The operation of the position information detecting system configured as described above will now be described with reference to the mobile terminal 1 and the base station 2a.
2b, 2c,... Will be described in detail with reference to FIG. In a standby state in which the mobile terminal 1 is waiting for the reception of a position information transmission request from the position management station 8, the nearest base station 2a receives the control signal 7a periodically transmitted on the control channel (FIG. 3). (A)).
【００１５】位置管理局８が移動端末１の現在地を求め
るために、移動端末１に対して基地局の情報対を要求す
ると、位置管理局８は移動端末１に発呼を行う。移動端
末１は、回線３０および制御局５を経由して呼出エリア
４内の基地局２ａから位置管理局８の発呼を着信する
（図３の（ｂ））。移動端末１は、着信後即座に、基地
局２ａ、２ｂ、２ｃ、……が制御チャネルで周期的に送
信している制御信号７ａ、７ｂ、７ｃ、……を受信する
（図３の（ｃ））。When the location management station 8 requests the mobile terminal 1 for a base station information pair in order to determine the current location of the mobile terminal 1, the location management station 8 calls the mobile terminal 1. The mobile terminal 1 receives a call from the location management station 8 from the base station 2a in the calling area 4 via the line 30 and the control station 5 ((b) in FIG. 3). The mobile terminal 1 immediately receives the control signals 7a, 7b, 7c,... That the base stations 2a, 2b, 2c,. )).
【００１６】アンテナ２０で受信した各基地局の電波
は、受信アンプ２１で増幅され、かつ中間周波数に変換
され、復調部２２によりベースバンド信号に復調され
る。ＩＤ検出部２３は、前記復調された信号から基地局
２ａ、２ｂ、２ｃ、……の制御信号７ａ、７ｂ、７ｃ、
……内の識別符号を検出する。電界強度測定部２４は、
受信アンプ２１の出力より基地局２ａ、２ｂ、２ｃ、…
…の受信電界強度を測定する。制御部２５は、個々の基
地局について、ＩＤ検出部２３から出力される識別符号
と、電界強度測定部２４から出力される受信電界強度の
情報を、一対の情報（情報対）として記憶部２６に格納
する。受信可能な基地局について、個々の前記情報対を
記憶部２６に格納する（図３の（ｄ））。The radio waves of each base station received by the antenna 20 are amplified by the receiving amplifier 21, converted to an intermediate frequency, and demodulated by the demodulation unit 22 into a baseband signal. The ID detector 23 controls the control signals 7a, 7b, 7c,... Of the base stations 2a, 2b, 2c,.
... The identification code in... Is detected. The electric field strength measurement unit 24
From the output of the receiving amplifier 21, the base stations 2a, 2b, 2c,.
.. Are measured. The control unit 25 stores the identification code output from the ID detection unit 23 and the information on the reception electric field intensity output from the electric field intensity measurement unit 24 as a pair of information (information pair) for each base station. To be stored. For each receivable base station, the information pair is stored in the storage unit 26 ((d) in FIG. 3).
【００１７】次に移動端末１は、通信用のチャネルの割
り当てを要求するリンクチャネル確立要求を基地局２ａ
に対して送信し（図３の（ｅ））、位置管理局８との通
信状態が確立した後、制御部２５により、格納された複
数の情報対のうち、受信電界強度の情報の大きい基地局
から順に１つまたは複数個の情報対を送信信号生成部２
７に出力する。送信信号生成部２７は、入力された情報
を規定のベースバンド信号フォーマットに変換し、変調
部２８に出力する。Next, the mobile terminal 1 issues a link channel establishment request for requesting assignment of a communication channel to the base station 2a.
(E) in FIG. 3, and after the communication state with the location management station 8 is established, the control unit 25 causes the control unit 25 to select the base having the largest received field strength information from among the stored information pairs. One or a plurality of information pairs in order from the station
7 is output. The transmission signal generation unit 27 converts the input information into a prescribed baseband signal format and outputs it to the modulation unit 28.
【００１８】変調部２８は入力されたベースバンド信号
を高周波信号に変調し、変調された高周波信号は送信ア
ンプ２９により電力増幅され、アンテナ２０により基地
局２ａに送信される（図３の（ｆ））。基地局２ａで受
信された移動端末１の信号は、制御局５から回線３０を
経由して位置管理局８に伝達される。位置管理局８で
は、各基地局の位置情報（設置されている場所の地理的
情報）は既知であるため、移動端末１が検出した基地局
の識別符号、および受信電界強度の情報対に基づき、移
動端末１の現在位置が特定される。The modulator 28 modulates the input baseband signal into a high-frequency signal, and the modulated high-frequency signal is power-amplified by the transmission amplifier 29 and transmitted to the base station 2a by the antenna 20 ((f in FIG. 3). )). The signal of the mobile terminal 1 received by the base station 2a is transmitted from the control station 5 to the location management station 8 via the line 30. The position management station 8 knows the position information of each base station (geographical information of the place where the base station is installed), and therefore, based on the identification code of the base station detected by the mobile terminal 1 and the information pair of the received electric field strength. , The current position of the mobile terminal 1 is specified.
【００１９】以上のように、本実施の形態によれば、位
置管理局８から移動端末１へ発呼した場合のみ、移動端
末１は基地局２ａ〜２ｄの情報対を検出し、位置管理局
８へ送出することにより、移動端末１の消費電力を削減
することができる。また、移動端末１は、位置管理局８
からの現在地検索要求に対して最新の位置情報を提供で
きる。As described above, according to the present embodiment, only when a call is made from location management station 8 to mobile terminal 1, mobile terminal 1 detects the information pair of base stations 2a to 2d, 8, the power consumption of the mobile terminal 1 can be reduced. Also, the mobile terminal 1 has a location management station 8
The latest location information can be provided in response to a current location search request from.
【００２０】なお、以上の説明では、移動体通信システ
ムとしてＰＨＳを利用した例で説明したが、その他の移
動体通信システムについても同様に実施可能である。In the above description, an example has been described in which a PHS is used as a mobile communication system. However, the present invention can be similarly applied to other mobile communication systems.
【００２１】[0021]
【発明の効果】以上のように本発明によれば、位置管理
局が、移動端末の現在位置を把握したい時点で移動端末
に発呼し、移動端末は、位置管理局からの着呼が発生し
た時点のみ識別符号および基地局の制御信号の受信電界
強度の情報を検知して位置管理局に送信することによ
り、移動端末の不要な電力消費を防止し、移動端末の長
電池寿命化、小型化ができるという効果が得られる。加
えて、位置管理局は、移動端末の最新の現在地を把握す
ることができるという効果が得られる。As described above, according to the present invention, the location management station calls the mobile terminal at a time when it is desired to grasp the current location of the mobile terminal, and the mobile terminal receives an incoming call from the location management station. By detecting the identification code and information on the received electric field strength of the control signal of the base station and transmitting the information to the location management station only at the time when the mobile terminal is used, unnecessary power consumption of the mobile terminal is prevented, the battery life of the mobile terminal is extended, and the size of the mobile terminal is reduced. The effect that conversion can be performed is obtained. In addition, there is an effect that the location management station can grasp the latest current location of the mobile terminal.
【図１】本発明の実施の形態１による位置情報検出シス
テムを示すブロック図FIG. 1 is a block diagram showing a position information detection system according to a first embodiment of the present invention.
【図２】同実施の形態による移動端末の構成を示すブロ
ック図FIG. 2 is a block diagram showing a configuration of a mobile terminal according to the embodiment;
【図３】同発明の実施の形態による無線区間の信号の流
れ図FIG. 3 is a signal flow chart of a radio section according to the embodiment of the present invention;
１ 移動端末 ２ａ〜２ｄ 基地局 ３ａ〜３ｄ 無線ゾーン ４ 一斉呼出エリア ５ 制御局 ６ａ〜６ｄ 電気通信回線設備 ７ａ〜７ｄ 制御信号 ８ 位置管理局 ２０ アンテナ ２１ 受信アンプ ２２ 復調部 ２３ ＩＤ検出部 ２４ 電界強度測定部 ２５ 制御部 ２６ 記憶部 ２７ 送信信号生成部 ２８ 変調部 ２９ 送信アンプ ３０ 回線 DESCRIPTION OF SYMBOLS 1 Mobile terminal 2a-2d Base station 3a-3d Radio zone 4 Simultaneous call area 5 Control station 6a-6d Telecommunication line equipment 7a-7d Control signal 8 Location management station 20 Antenna 21 Receiving amplifier 22 Demodulation unit 23 ID detection unit 24 Electric field Intensity measurement unit 25 Control unit 26 Storage unit 27 Transmission signal generation unit 28 Modulation unit 29 Transmission amplifier 30 lines
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04Q 7/00 - 7/38 H04B 7/24 - 7/26 102 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) H04Q 7/ 00-7/38 H04B 7 /24-7/26 102
Claims (1)
検出するＩＤ検出部と、 個々の基地局の受信電界強度を測定する電界強度測定部
と、 １つまたは複数の基地局の識別符号、および前記基地局
の制御信号の受信電界強度からなる、１対または複数対
の位置情報を格納する記憶部と、 前記位置情報を基地局への送信信号に変換する送信信号
生成部とを備え、 位置情報送出要求を制御用チャネルを通じて着信した後
に、周辺に存在する基地局の制御信号を受信し、前記制
御信号に含まれる前記基地局の識別符号と、前記制御信
号の受信電界強度との対からなる位置情報を、前記記憶
部に格納した後、基地局との間で通信用チャネルを確立
し、前記記憶部に格納された前記位置情報を前記通信用
チャネルを通じて通信相手方に伝送することを特徴とす
る無線移動端末。1. An ID detection unit for detecting an identification code transmitted from each base station; an electric field intensity measurement unit for measuring a received electric field intensity of each base station; and an identification code for one or more base stations. And a storage unit for storing one or more pairs of position information comprising reception electric field strength of a control signal of the base station, and a transmission signal generation unit for converting the position information into a transmission signal to the base station. After receiving the position information transmission request through the control channel, receiving a control signal of a base station present in the vicinity, the identification code of the base station included in the control signal, the received signal strength of the control signal and After storing the paired location information in the storage unit, a communication channel is established with the base station, and the location information stored in the storage unit is used for the communication.
A wireless mobile terminal for transmitting to a communication partner through a channel .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04718596A JP3196634B2 (en) | 1996-03-05 | 1996-03-05 | Wireless mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04718596A JP3196634B2 (en) | 1996-03-05 | 1996-03-05 | Wireless mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09247735A JPH09247735A (en) | 1997-09-19 |
| JP3196634B2 true JP3196634B2 (en) | 2001-08-06 |
Family
ID=12768051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04718596A Expired - Fee Related JP3196634B2 (en) | 1996-03-05 | 1996-03-05 | Wireless mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3196634B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3527517B2 (en) * | 1998-07-30 | 2004-05-17 | 三菱電機株式会社 | Mobile communication system |
| WO2001020936A1 (en) * | 1999-09-13 | 2001-03-22 | Mitsubishi Denki Kabushiki Kaisha | Mobile communication terminal |
| KR100834616B1 (en) * | 2002-02-27 | 2008-06-02 | 삼성전자주식회사 | Method for determining ms location without gps in mobile communication system |
| GB0612438D0 (en) * | 2006-06-23 | 2006-08-02 | Siemens Ag | Network selection |
-
1996
- 1996-03-05 JP JP04718596A patent/JP3196634B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09247735A (en) | 1997-09-19 |
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