JPH1023501A - Inter-station hand-over system for mobile terminal equipment - Google Patents
Inter-station hand-over system for mobile terminal equipmentInfo
- Publication number
- JPH1023501A JPH1023501A JP8173468A JP17346896A JPH1023501A JP H1023501 A JPH1023501 A JP H1023501A JP 8173468 A JP8173468 A JP 8173468A JP 17346896 A JP17346896 A JP 17346896A JP H1023501 A JPH1023501 A JP H1023501A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- mobile terminal
- switching source
- switching
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は移動体端末の局間ハ
ンドオーバ方式に関する。近年，移動体通信が広く普及
されるようになった。その中でパーソナル・ハンディホ
ン・システム（ＰＨＳ）等の移動体通信では，基地局は
一つの局交換機と接続されて複数の交換機間との回線を
持たず，各端末は一つの基地局とだけ通信回線を持つた
め，移動している端末が現在通信中の基地局との回線が
不良になった時に，別の交換局の基地局に切替え（ハン
ドオーバという）を行う場合に切替え時間がかかるた
め，その改善が望まれている。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-station handover system for mobile terminals. In recent years, mobile communication has been widely spread. In mobile communication such as personal handy phone system (PHS), the base station is connected to one central office and does not have a line between a plurality of exchanges, and each terminal is connected to only one base station. Since the mobile terminal has a communication line, it takes a long time to switch to another base station (called handover) when the line with the base station with which the mobile terminal is currently communicating becomes defective. , And its improvement is desired.
【０００２】[0002]
【従来の技術】従来の移動体通信システムとして，移動
体端末（以下，単に移動端末という）から無線で基地局
と接続して，基地局から有線で接続する局交換機を介し
て相手の端末と通信を行うが，その中でパーソナル・ハ
ンディホン・システム（ＰＨＳ）や類似のシステムにつ
いて図８により説明する。2. Description of the Related Art As a conventional mobile communication system, a mobile terminal (hereinafter, simply referred to as a mobile terminal) connects to a base station by radio, and communicates with a partner terminal via a central office connected by a wire from the base station. Communication is performed. Among them, a personal handy phone system (PHS) and a similar system will be described with reference to FIG.
【０００３】図９は従来例の説明図であり，従来のＰＨ
Ｓのような移動体通信システムの一部のブロック構成を
示す。図中，７９，８０，８１は局交換機，８２，８３
は局交換機８０に接続する基地局（ＣＳで表示），８
４，８５は局交換機８１に接続する基地局，８６は移動
端末（ＰＳで表示）であり，局交換機８０，８１は更に
上位の局交換機７９を介するか，または中継線により直
接接続されている。FIG. 9 is an explanatory view of a conventional example.
2 shows a partial block configuration of a mobile communication system such as S. In the figure, 79, 80, 81 are central office exchanges, 82, 83
Is a base station (indicated by CS) connected to the central office 80, 8
Reference numerals 4 and 85 denote base stations connected to the central office 81, and 86 denotes a mobile terminal (indicated by PS). The central offices 80 and 81 are connected via a higher central office 79 or directly via a trunk line. .
【０００４】ＰＨＳのような移動体通信システムは，次
のような特徴を備えている。 システムは，局交換機，基地局，移動端末とで構成さ
れる。 局交換機は一つまたは複数の基地局を収容する。A mobile communication system such as a PHS has the following features. The system includes a central office switch, a base station, and a mobile terminal. The central office accommodates one or more base stations.
【０００５】基地局は一つの局交換機とだけ回線を接
続しており，複数の交換機間に回線を持たない。 移動端末は一つの基地局との通信回線を持つことがで
き，複数の基地局と同時に通信回線を接続することがで
きない。[0005] The base station has a line connected to only one central office exchange, and has no line between a plurality of exchanges. A mobile terminal can have a communication line with one base station, and cannot connect a communication line simultaneously with a plurality of base stations.
【０００６】端末は網の構成に関する情報を持たず，
網からの指示の元に通信を行う。 移動している端末が現在通信中の端末との回線が不良
になった場合，別の基地局との通信が可能である場合，
端末より要求することにより基地局の切替（ハンドオー
バ）を行う機能を持つ。[0006] The terminal has no information on the network configuration,
Communication is performed under instructions from the network. If the moving terminal has a bad line with the terminal with which it is currently communicating, if it can communicate with another base station,
It has a function of switching base stations (handover) by requesting from terminals.
【０００７】上記の条件を満たす移動体通信システムに
おいて局交換機を跨がるハンドオーバを行う場合の手順
を図８を用いて説明する。移動端末８６が同じ局交換機
８０に接続する基地局８２と通信を行って移動している
時回線不良により移動端末８６から切替元の端末番号を
付加したハンドオーバの契機信号を送信する。これを近
い位置の基地局８３で検出すると基地局８３は局交換機
８０に対し端末番号を用いて切替元の情報（切替元の基
地局８２）を要求する。局交換機８０は自局が保持する
管理情報を端末番号を用いて切替元を検索し，基地局８
２が自局に所属するので，切替元として基地局８２の情
報を検出し，局交換機８０は当該移動端末８６の通信パ
スを基地局８２経由から基地局８３を経由するよう切替
えを行う。A procedure for performing a handover across a central office in a mobile communication system satisfying the above conditions will be described with reference to FIG. When the mobile terminal 86 is moving by communicating with the base station 82 connected to the same central office switch 80, the mobile terminal 86 transmits a handover trigger signal to which a switching source terminal number is added due to a line failure. When this is detected by the base station 83 at a close position, the base station 83 requests the switching center 80 for switching source information (switching source base station 82) using the terminal number. The central office exchange 80 searches for the switching source using the terminal number for the management information held by the local exchange, and the base station 8
Since station 2 belongs to its own station, the information of base station 82 is detected as a switching source, and central office switch 80 switches the communication path of mobile terminal 86 from base station 82 to base station 83.
【０００８】移動端末８６が更に基地局８４側に移動し
て回線不良になると，同様にハンドオーバの契機信号を
送信する。この場合，基地局８４でこれを受信して，局
交換機８１に対し切替元の情報を要求する。これに応じ
て，局交換機８１は自局が保持する管理情報を検索する
が，当該移動端末８６の情報を持っていないため切替元
の情報が得られない。局間ハンドオーバを行うには，切
替先の交換機で切替元の基地局８３や局交換機８０の情
報が必要であるため，問い合わせを局交換機８１で行う
ことになるが，従来の方式ではハンドオーバの契機信号
（移動端末８６から発生する信号）には切替元情報とし
て局交換機情報が含まれてない（移動端末８６に保持さ
れない）ため，切替元を特定する方法がない。これに対
処するには，隣接する局交換機８０の情報を自分で管理
しその隣接する局交換機に総当たりで問い合わせるか，
局交換機８０，８１の更に上位のノードである局交換機
７９で現在の位置情報を管理させて，そのノードに問い
合わせる方法等を取らなければならない。[0008] When the mobile terminal 86 further moves to the base station 84 to cause a line failure, a handover trigger signal is transmitted similarly. In this case, the base station 84 receives this and requests the switching center 81 for switching source information. In response, the central office 81 searches for the management information held by itself, but cannot obtain the switching source information because it does not have the information of the mobile terminal 86. In order to perform the inter-office handover, information of the switching source base station 83 and the central office switch 80 is required in the exchange of the switching destination, so that the inquiry is performed by the central office 81. Since the signal (the signal generated from the mobile terminal 86) does not include the central office exchange information as the switching source information (it is not stored in the mobile terminal 86), there is no method for specifying the switching source. In order to cope with this, the information of the adjacent central office 80 is managed by itself, and the adjacent central office is inquired by brute force.
The current position information must be managed by the central office 79, which is a higher-order node of the central offices 80 and 81, and a method of inquiring the node must be adopted.
【０００９】[0009]
【発明が解決しようとする課題】局交換機にまたがるハ
ンドオーバを行うために，上記した隣接交換機に対し総
当たりで管理情報を問い合わせる方式や，上位ノードに
位置情報を管理させて上位ノードに問い合わせる方式で
は，手続きが複雑化することや，処理の増大による切替
え時間が長くなるという問題がある。In order to perform a handover across the central office exchange, there is a method of inquiring management information to the adjacent exchanges on a round robin basis or a method of instructing an upper node to manage location information and inquire of an upper node. However, there is a problem that the procedure becomes complicated and the switching time becomes longer due to an increase in processing.
【００１０】本発明は局交換機にまたがるハンドオーバ
における切替を短時間で実現できる移動体端末の局間ハ
ンドオーバ方式を提供することを目的とする。It is an object of the present invention to provide an inter-station handover method for mobile terminals, which can realize switching in a handover over a central office in a short time.
【００１１】[0011]
【課題を解決するための手段】図１は本発明の第１の原
理構成図，図２は本発明の第２の原理構成図である。図
１において，１は移動端末，１ａはハンドオーバ要求
部，２は切替元の基地局，２ａは切替元情報応答部，３
は切替先の基地局，３ａは切替元情報収集部，３ｂは局
間ハンドオーバ要求部，４は切替元の局交換機，５は切
替先の局交換機である。FIG. 1 is a block diagram showing a first principle of the present invention, and FIG. 2 is a block diagram showing a second principle of the present invention. In FIG. 1, 1 is a mobile terminal, 1a is a handover request unit, 2 is a base station of a switching source, 2a is a switching source information response unit, 3
Is a switching destination base station, 3a is a switching source information collection unit, 3b is an interoffice handover requesting unit, 4 is a switching center station exchange, and 5 is a switching destination office switching unit.
【００１２】本発明は局間ハンドオーバの切替え時間を
短縮するため局交換機間で切替元の問い合わせをするの
ではなく，より下位のノードである基地局にて切替元の
位置情報を通知するようにしたものである。最も下位の
ノードである移動端末で位置情報を持つことが考えられ
るが，その場合は移動端末の全てに局交換機が持つ位置
情報を通知する必要があり，ユーザに網内に限られた情
報を意識させる点から望ましくない。また，本発明の切
替元情報の通知を行うための基地局間の通信は，無線に
より行う方がコスト及び技術的に有利であるが，有線に
より行うことも可能である。According to the present invention, in order to shorten the switching time of the inter-station handover, instead of inquiring the switching source between the central office exchanges, the base station, which is a lower-order node, notifies the location information of the switching source. It was done. It is conceivable that the mobile terminal, which is the lowest node, has location information. In this case, it is necessary to notify all mobile terminals of the location information of the central office, and to provide the user with information limited to the network. It is not desirable from the point of awareness. The communication between base stations for notifying the switching source information according to the present invention is more preferably performed wirelessly in terms of cost and technology, but can also be performed by wire.
【００１３】本発明の第１の原理は，図１において移動
端末１が点線の位置の時，局交換機４と接続する基地局
２を介して無線で通信を行っている時，移動により回線
不良になると従来と同様に移動端末１の端末番号を付加
したハンドオーバ要求信号をハンドオーバ要求部１ａか
ら発生する（図１の）。この信号を隣接する異なる局
交換機５に接続された基地局３で検出すると，この基地
局３は切替元情報収集部３ａから移動端末１の端末番号
を付けた切替元情報要求を送信する（図１の）。これ
を受けた近隣の基地局の中で，基地局２は要求された移
動端末１の端末番号の切替元であるため，この端末番号
に自基地局２の識別情報及び上位の局交換機４の識別情
報を含む切替元情報を切替元情報応答部２ａから送信す
る（図１の）。この切替元情報を受け取った基地局３
は，この切替元情報を付加した局間ハンドオーバ要求を
局間ハンドオーバ要求部３ｂから上位の切替先の局交換
機５に通知する（図１の）。局交換機５は切替元情報
を用いて切替元の基地局２の局交換機４を介する通信パ
スを自局交換機５，基地局３の通信パスに切替えて局間
ハンドオーバが実行される。The first principle of the present invention is as follows. In FIG. 1, when the mobile terminal 1 is at the position indicated by the dotted line, when communicating wirelessly via the base station 2 connected to the central office 4 , A handover request signal to which the terminal number of the mobile terminal 1 is added is generated from the handover request unit 1a as in the prior art (FIG. 1). When this signal is detected by the base station 3 connected to the adjacent different central office 5, the base station 3 transmits a switching source information request with the terminal number of the mobile terminal 1 from the switching source information collecting unit 3 a (FIG. 1). Among the neighboring base stations receiving this, the base station 2 is the switching source of the terminal number of the requested mobile terminal 1. The switching source information including the identification information is transmitted from the switching source information response unit 2a (of FIG. 1). Base station 3 that has received this switching source information
Informs the interoffice handover request to which the switching source information has been added from the interoffice handover request unit 3b to the higher switching office 5 (FIG. 1). The central office switch 5 uses the switching source information to switch the communication path of the switching source base station 2 via the central office switch 4 to the communication paths of the own central office switching unit 5 and the base station 3, and executes the interoffice handover.
【００１４】図２に示す本発明の第２の原理構成におい
て，１〜３は図１の各符号と同様であり説明を省略す
る。図２において，移動端末１は上記図１と同様にハン
ドオーバ要求部１ａを備え，切替元の基地局２は切替元
情報送信部２ｂ，電界強度判定部２ｃを備え，切替先の
基地局３は局間ハンドオーバ要求部３ｂ，切替元情報受
信部３ｃ，タイマ部３ｄを備えている。In the second principle configuration of the present invention shown in FIG. 2, reference numerals 1 to 3 are the same as those in FIG. In FIG. 2, the mobile terminal 1 includes a handover request unit 1a as in FIG. 1, the switching source base station 2 includes a switching source information transmitting unit 2b, an electric field strength determination unit 2c, and the switching destination base station 3 An inter-station handover request unit 3b, a switching source information receiving unit 3c, and a timer unit 3d are provided.
【００１５】本発明の第２の原理は，移動端末１が基地
局２と通信中の状態の時基地局２では電界強度判定部２
ｃで電界強度を測定して一定の閾値より弱い（低い）か
判別し，弱いと判別されると，当該移動端末１の切替元
情報（移動端末の電話番号，当該基地局２の識別情報，
上位の局交換機４の識別情報）を周囲の基地局へ無線で
送信する。近隣の基地局３でこの切替元情報を切替元情
報受信部３ｃで受け取るとこれを保持すると共にタイマ
部３ｄを起動する。タイマ部３ｄに設定された時間内
に，移動端末１からハンドオーバ要求信号を受け取る
と，移動端末１が基地局３の近くに移動したものとし
て，局間ハンドオーバ要求部３ｂから先に受信した切替
元情報を付加した局間ハンドオーバ要求を基地局３を収
容する局交換機５へ送出する。これにより，局交換機５
を含めた上位の交換機により局間ハンドオーバが実行さ
れる。The second principle of the present invention is that when the mobile terminal 1 is in communication with the base station 2,
c, the electric field intensity is measured to determine whether the electric field strength is weaker (lower) than a certain threshold. If it is determined that the electric field strength is weaker, the switching source information of the mobile terminal 1 (the telephone number of the mobile terminal, the identification information of the base station 2,
It transmits the identification information of the upper-level central office 4) to the surrounding base stations by radio. When the neighboring base station 3 receives the switching source information at the switching source information receiving unit 3c, the switching source information is held and the timer unit 3d is started. When the handover request signal is received from the mobile terminal 1 within the time set in the timer unit 3d, it is determined that the mobile terminal 1 has moved closer to the base station 3 and the switching source signal received earlier from the inter-station handover request unit 3b. The inter-station handover request with the information added is sent to the central office 5 accommodating the base station 3. As a result, the central office 5
The inter-station handover is executed by a higher-level switch including the above.
【００１６】[0016]
【発明の実施の形態】図３は基地局のブロック構成図で
ある。図中，３０は基地局，３１は対端末無線部，３２
は対基地局無線部，３３は局交換機とのインタフェース
部，３４は処理装置，３５はアンテナである。FIG. 3 is a block diagram of a base station. In the figure, 30 is a base station, 31 is a radio unit for terminals, 32
Denotes a base station radio unit, 33 denotes an interface unit with the central office, 34 denotes a processing unit, and 35 denotes an antenna.
【００１７】この図３に示す基地局３０は，全体の制御
を処理装置３４により行い，移動端末との無線による通
話信号及び制御信号の送受信は対端末無線部３１により
行い，移動端末からのハンドオーバ契機信号の受信もこ
こで行う。そして，移動端末から局間ハンドオーバの要
求に対しては，処理装置３４の制御により対基地局無線
部３２が動作して他の基地局と無線による送受信が行わ
れる。なお，他の基地局との間で有線の伝送路を介して
通信を行うように変更してもよい。In the base station 30 shown in FIG. 3, the whole control is performed by the processing unit 34, the transmission / reception of the communication signal and the control signal by radio with the mobile terminal is performed by the radio unit 31 for the terminal, and the handover from the mobile terminal is performed. The trigger signal is also received here. Then, in response to a request for an inter-station handover from the mobile terminal, the base station radio section 32 operates under the control of the processing device 34 to perform radio transmission / reception with another base station. The communication may be changed so as to communicate with another base station via a wired transmission path.
【００１８】図４は実施例１の局間ハンドオーバの制御
シーケンスであり，上記図１の原理構成に対応する。図
４において，各符号１〜３は上記図１の符号と同様であ
り，１は移動端末，２は切替元の基地局，３は切替先の
基地局を表し，各基地局２，３の制御については対移動
端末部（図３の処理装置３４により制御される対端末無
線部３１に対応）と対基地局部（図３の処理装置３４に
より制御される対基地局無線部３２に対応）の２つに分
けて示す。また，図中の「通常ハンドオーバシーケン
ス」という表示は，局交換機における従来のハンドオー
バの処理を表す。FIG. 4 shows a control sequence of the inter-station handover according to the first embodiment, which corresponds to the above-described principle configuration of FIG. In FIG. 4, reference numerals 1 to 3 are the same as those in FIG. 1, 1 is a mobile terminal, 2 is a switching source base station, 3 is a switching destination base station. As for the control, the mobile terminal unit (corresponding to the radio terminal unit 31 controlled by the processing unit 34 in FIG. 3) and the base station unit (corresponding to the base station radio unit 32 controlled by the processing unit 34 in FIG. 3) Are shown separately. The indication "normal handover sequence" in the figure indicates a conventional handover process in the central office.
【００１９】移動端末１が切替元の基地局２と通信中状
態にある時（図４のＳ１０，Ｓ２０），基地局２の対基
地局部及び基地局３の対基地局部及び対移動端末部は待
ち受付状態になる（図４のＳ２１，Ｓ３０，Ｓ３１）。
移動端末１が移動して回線不良になると従来と同様にハ
ンドオーバ契機信号としてハンドオーバ呼設定要求（Ｓ
ＥＴＵＰと呼ばれる）信号が送信される（図４のＳ１
１）。このハンドオーバ呼設定要求信号には移動端末１
の電話番号が含まれ，制御チャネルにより送信され，移
動端末１に近い位置の切替先の基地局３の対移動端末部
がこれを受信する（同Ｓ３２）。When the mobile terminal 1 is in communication with the switching source base station 2 (S10, S20 in FIG. 4), the base station unit of the base station 2 and the base station unit and the mobile terminal unit of the base station 3 It enters the waiting reception state (S21, S30, S31 in FIG. 4).
When the mobile terminal 1 moves to cause a line failure, a handover call setup request (S
A signal (called ETUP) is transmitted (S1 in FIG. 4).
1). This handover call setup request signal includes the mobile terminal 1
Is transmitted by the control channel, and is received by the mobile terminal unit of the base station 3 of the switching destination close to the mobile terminal 1 (S32).
【００２０】これにより切替先の基地局３の対基地局部
は，周辺基地局へ移動端末の電話番号（電番で表示）を
キーにして切替元情報を収集するための信号を送信する
（図４のＳ３３）。切替元情報収集を要求する信号には
次の，が含まれる。Thus, the base station unit of the switching destination base station 3 transmits a signal for collecting switching source information to the peripheral base station by using the telephone number (displayed by telephone number) of the mobile terminal as a key (FIG. S33 of No. 4). The signal requesting the collection of the switching source information includes the following.
【００２１】切替先基地局ＩＤ：切替先の基地局（図
４の３）を特定できる情報 ハンドオーバ要求移動端末電話番号：移動端末（図４
の１）の電話番号 この時の対基地局用の制御信号は，対移動端末用と異な
る周波数帯域を用い，無線通信の混在ができるようにす
る。また，基地局−基地局間の通信に用いるプロトコル
は，基地局−移動端末間での通信に使用するプロトコル
と同じでもよいが，全く別のプロトコルを定義すること
が可能である。Switching destination base station ID: information for specifying the switching destination base station (3 in FIG. 4) Handover request mobile terminal telephone number: mobile terminal (FIG. 4)
(1) Telephone number At this time, the control signal for the base station uses a different frequency band from that for the mobile terminal, so that wireless communication can be mixed. The protocol used for communication between the base station and the base station may be the same as the protocol used for communication between the base station and the mobile terminal, but it is possible to define a completely different protocol.
【００２２】この切替元情報収集信号は無線により送信
され周辺の基地局で受信され（図４のＳ２２），その中
の移動端末電話番号を用いて対移動端末部に対し通信中
の端末を検索して，該当電話番号の端末が通信中の状態
か識別する（同Ｓ２３）。この場合，各基地局は自基地
局と通信中の移動端末の電話番号が登録され，管理され
ており，図示されない他の周辺の基地局では該当電話番
号の移動端末と通信を行ってないため，基地局３に対し
て無応答であるが（同Ｓ２４），基地局２の場合は該当
電話番号の端末が通信中であるため，自基地局が切替元
であることが判別でき，対基地局部に該当端末が通信中
であることを通知する。基地局２の対基地局部は，これ
により切替元情報を生成して切替先の基地局３へ応答す
る（図４のＳ２５）。この切替元情報は次の〜の情
報で構成される。The switching source information collection signal is transmitted by radio and received by the neighboring base stations (S22 in FIG. 4), and a terminal communicating with the mobile terminal unit is searched by using the mobile terminal telephone number in the signal. Then, it is determined whether the terminal of the corresponding telephone number is in communication (S23). In this case, each base station registers and manages the telephone number of the mobile terminal that is communicating with its own base station, and other base stations not shown do not communicate with the mobile terminal of the corresponding telephone number. No response is made to the base station 3 (S24), but in the case of the base station 2, since the terminal of the corresponding telephone number is communicating, it is possible to determine that the own base station is the switching source, and Notify the local that the terminal is communicating. The base station unit of the base station 2 thereby generates switching source information and responds to the switching destination base station 3 (S25 in FIG. 4). This switching source information is composed of the following information.
【００２３】切替元基地局−ＩＤ：切替元基地局を特
定できる情報 切替元基地局収容交換機−ＩＤ：切替元基地局が収容
されている交換機を特定できる情報 ハンドオーバ要求移動端末電話番号 上記の，は基地局２内で得ることができるが，の
切替元基地局収容交換機−ＩＤは，局交換機の局データ
として登録されているので，基地局２から１度自基地局
が接続されている局交換機に問い合わせを行う等により
そのＩＤを収集して基地局２内に登録しておくか，基地
局の設置時にその基地局が接続される局交換機−ＩＤを
基地局データとして設定保持する等により取得すること
ができる。Switching source base station-ID: Information capable of identifying the switching source base station Switching source base station-accommodating exchange-ID: Information capable of identifying the switching equipment accommodating the switching source base station Handover request mobile terminal telephone number Can be obtained in the base station 2. However, since the switching source base station accommodating exchange-ID is registered as the station data of the central office exchange, the station to which the own base station is connected once from the base station 2 The ID is collected and registered in the base station 2 by inquiring the exchange or the like, or the central office switch-ID to which the base station is connected is set and held as base station data when the base station is installed. Can be obtained.
【００２４】切替先の基地局３では，対基地局部が，切
替元情報の収集要求を発生した後，応答待ちとなり応答
が発生した否かを判別し（図４のＳ３４），応答がある
と切替元情報を受信して（同Ｓ３５），対移動端末部に
応答された上記〜の情報を渡す。基地局３の対移動
端末部では，従来の呼設定信号（ＳＥＴＵＰ）にこれら
の切替元情報，すなわち切替元基地局−ＩＤ，切替元基
地局収容交換機−ＩＤ及びハンドオーバ要求移動端末電
話番号をオプションとして追加して，当該基地局３を収
容する局交換機（図示せず）に対し有線の伝送路を介し
て送出する。この後，基地局３を収容する局交換機によ
り通常のハンドオーバシーケンスが実行されて局間ハン
ドオーバが実行される。At the switching destination base station 3, the base station unit waits for a response after issuing a request for collecting switching source information, and determines whether or not a response has occurred (S34 in FIG. 4). The switching source information is received (S35), and the above information (1) to (4) is passed to the mobile terminal unit. In the mobile terminal unit of the base station 3, these switching source information, that is, the switching source base station-ID, the switching source base station accommodating exchange-ID, and the handover request mobile terminal telephone number are optionally added to the conventional call setup signal (SETUP). And transmits the data to a central office (not shown) accommodating the base station 3 via a wired transmission path. Thereafter, a normal handover sequence is executed by the central office exchange accommodating the base station 3, and an interoffice handover is executed.
【００２５】図５は実施例２の局間ハンドオーバの制御
シーケンスである。この実施例２は上記図２に示す第２
の原理に対応する。図５において，各符号１〜３は上記
図１の符号と同様であり，１は移動端末，２は切替元の
基地局，３は切替先の基地局を表す。各基地局２，３の
処理は図示省略されていないが上記図３と同様の構成を
備え対移動端末無線部，対基地局無線部，及び局交換機
とのインタフェースや処理装置を備え，上記図４と同様
に対移動端末，対基地局に対して処理を行っている。ま
た，図中の「通常ハンドオーバシーケンス」という表示
は，上記図４と同様に局交換機における従来のハンドオ
ーバの処理を表す。FIG. 5 shows a control sequence of the inter-station handover according to the second embodiment. The second embodiment is similar to the second embodiment shown in FIG.
Corresponding to the principle of In FIG. 5, reference numerals 1 to 3 are the same as those in FIG. 1, 1 is a mobile terminal, 2 is a base station of a switching source, and 3 is a base station of a switching destination. Although the processing of each of the base stations 2 and 3 is not shown, it has the same configuration as that of FIG. 3 and includes a radio unit for mobile terminals, a radio unit for base stations, an interface with a central office switch, and a processing device. In the same manner as in No. 4, processing is performed for the mobile terminal and the base station. Also, the indication "normal handover sequence" in the figure represents the conventional handover process in the central office as in FIG.
【００２６】この実施例２の制御シーケンスを説明する
と，移動端末１が切替元の基地局２と通信中状態にある
時（図５のＳ１０，Ｓ２０），基地局２では通信中の移
動端末１の電界強度を常時または一定周期で測定し，そ
の測定により得られた電界強度が閾値を越えるか判別す
る。移動端末１が移動することにより，電界強度が閾値
を越えて弱くなったことが検出されると（図５のＳ２
１），切替元情報を周辺の基地局に対し無線（対基地局
無線部）により通知する（同Ｓ２２）。この時の切替元
情報としては，上記実施例１（図４）に説明したのと同
様に，当該基地局２の基地局−ＩＤ，基地局２を収容す
る局交換機−ＩＤ及び電界強度が弱くなった通信中の移
動端末１の端末電話番号とを含む。切替元情報通知が送
信されると，周辺の基地局（その対基地局無線部）でこ
れを受信する。基地局３の場合，切替元情報を受信する
と（図５のＳ３１），ハンドオーバ呼設定要求信号待ち
状態になり，同時にタイマをスタートさせる（同Ｓ３
２）。The control sequence according to the second embodiment will be described. When the mobile terminal 1 is in communication with the switching source base station 2 (S10 and S20 in FIG. 5), the base station 2 communicates with the mobile terminal 1 Is measured at all times or at regular intervals, and it is determined whether or not the electric field strength obtained by the measurement exceeds a threshold value. When it is detected that the mobile terminal 1 has moved and the electric field strength has exceeded the threshold value and has become weak (S2 in FIG. 5).
1) The switching source information is notified wirelessly (to the base station radio section) to the surrounding base stations (S22). As the switching source information at this time, as described in the first embodiment (FIG. 4), the base station-ID of the base station 2, the central office exchange-ID accommodating the base station 2, and the electric field strength are weak. And the terminal telephone number of the mobile terminal 1 currently communicating. When the switching source information notification is transmitted, it is received by the neighboring base station (its base station radio unit). In the case of the base station 3, upon receiving the switching source information (S31 in FIG. 5), the base station 3 waits for a handover call setting request signal and simultaneously starts a timer (S3).
2).
【００２７】この後，移動端末１の移動により回線不良
になって，ハンドオーバ呼設定要求信号が発生すると
（図５のＳ１１），周辺の基地局の中で移動端末１の移
動先に近い位置の基地局３がこの信号をタイムアウトす
る前に受信すると，従来の呼設定信号（ＳＥＴＵＰ）に
受信した切替元情報をオプションとして追加してこの基
地局３を収容する局交換機（図示省略）に送信する。そ
の局交換機はこれを受けて，通常のハンドオーバ手順に
より切替元の局交換機，基地局２の通信パスを自局交換
機と基地局３を経由する通信パスに切替える。基地局３
が切替元情報を受信した後，切替元情報に含まれた電話
番号を持つ移動端末からハンドオーバ要求を受け取られ
ないでタイムアウトすると，保持していた受信情報を廃
棄する。Thereafter, when a line failure occurs due to the movement of the mobile terminal 1 and a handover call setup request signal is generated (S11 in FIG. 5), the mobile terminal 1 moves to a position close to the destination of the mobile terminal 1 among the neighboring base stations. If the base station 3 receives this signal before the timeout, the switching source information received as an option is added to the conventional call setup signal (SETUP) and transmitted to the central office (not shown) accommodating the base station 3. . In response to this, the central office exchange switches the communication path of the switching center office exchange and the base station 2 to the communication path passing through the own central office exchange and the base station 3 by a normal handover procedure. Base station 3
After receiving the switching source information, if a timeout occurs without receiving the handover request from the mobile terminal having the telephone number included in the switching source information, the received reception information is discarded.
【００２８】図６は実施例３の局間ハンドオーバの制御
シーケンスである。図中，１〜３の各符号は上記図４の
実施例１の各符号と同じである。この実施例３は上記実
施例１（図４）と同じ原理に基づくが，上記実施例１で
は局間ハンドオーバを利用した悪意呼（実際に移動して
いない移動端末からのハンドオーバ要求を行う呼）や，
別事業者の基地局との混在時における誤った接続が発生
するおそれがあったが，この実施例３はそのような事態
を防止するための制御を行う。以下に(1) 〜(10)の動作
順に説明する。FIG. 6 shows a control sequence of the inter-station handover according to the third embodiment. In the figure, reference numerals 1 to 3 are the same as those in the first embodiment shown in FIG. The third embodiment is based on the same principle as the first embodiment (FIG. 4). However, in the first embodiment, a malicious call using an inter-station handover (a call for performing a handover request from a mobile terminal that is not actually moving). And
There is a possibility that an erroneous connection may occur at the time of coexistence with a base station of another operator, but the third embodiment performs control to prevent such a situation. The operation will be described below in the order of (1) to (10).
【００２９】(1) 最初は，上記実施例１（図４）と同様
に，移動端末１が移動元の基地局２の対移動端末部を介
して通信中の状態の時（図６のＳ１０，Ｓ２０），移動
端末１が移動して回線不良になると，移動端末１の電話
番号が含むハンドオーバ呼設定要求信号を送信する（図
６のＳ１１）。(1) First, similarly to the first embodiment (FIG. 4), when the mobile terminal 1 is in a state of communicating via the mobile terminal unit of the source base station 2 (S10 in FIG. 6). , S20), when the mobile terminal 1 moves to cause a line failure, a handover call setting request signal including the telephone number of the mobile terminal 1 is transmitted (S11 in FIG. 6).
【００３０】(2) この信号が切替先の基地局３の対移動
端末部において受信されると（図６のＳ３２），切替先
の基地局３の対基地局部が周辺基地局へ電話番号をキー
にして（切替先基地局ＩＤを含む）切替元情報の収集信
号を送信する（図６のＳ３３）。(2) When this signal is received by the mobile terminal unit of the switching destination base station 3 (S32 in FIG. 6), the base station unit of the switching destination base station 3 sends a telephone number to the neighboring base station. A collection signal of the switching source information (including the switching destination base station ID) is transmitted as a key (S33 in FIG. 6).
【００３１】(3) これを受けた切替元の基地局２の対基
地局部が対移動端末部に該当電番が通信中か問い合わせ
（図６のＳ２３），通話中であることが分かると，この
実施例３による基地局間認証の制御が開始する。すなわ
ち，切替元の基地局２の対基地局部から認証用の個別制
御チャネル（回線）設定を要求する（同２４）。(3) In response to this, the base station unit of the switching source base station 2 asks the mobile terminal unit whether the corresponding telephone number is communicating (S23 in FIG. 6). The control of authentication between base stations according to the third embodiment starts. In other words, a request is made for the individual control channel (line) for authentication from the base station unit of the base station 2 of the switching source (No. 24).
【００３２】(4) 切替先の基地局３でこれを受信する
と，個別制御チャネル設定要求を受信し（図６のＳ３
５），指定された制御チャネルを設定する。 (5) 切替元の基地局２は設定された制御チャネルを介し
て，認証要求を行う（図６のＳ２５）。具体例で説明す
ると，基地局２から当該基地局の事業者の識別番号を乱
数を用いて予め決められた演算式により演算を施して符
号化して基地局３へ送信する。(4) When the switching destination base station 3 receives this, it receives an individual control channel setting request (S3 in FIG. 6).
5) Set the specified control channel. (5) The switching source base station 2 issues an authentication request via the set control channel (S25 in FIG. 6). More specifically, the base station 2 encodes the identification number of the operator of the base station using a random number using a predetermined arithmetic expression, and transmits the result to the base station 3.
【００３３】(6) 切替先の基地局３でこれを受信すると
（図６の３６），同じ事業者であれば，同じ乱数を用い
て決められた復号の演算を行って復号を行い，その結果
を認証情報として応答する（同Ｓ３７）。(6) When this is received by the switching destination base station 3 (36 in FIG. 6), if it is the same operator, the same random number is used to perform a predetermined decoding operation to perform decoding. The result is returned as authentication information (S37).
【００３４】(7) 切替元の基地局２は，切替先の基地局
からの認証の情報を受信すると（図６のＳ２６），その
内容をチェックして認証応答の結果が正しい（正当であ
る）時だけ，切替元情報（切替元基地局−ＩＤ，切替元
基地局収容交換機−ＩＤ，ハンドオーバ要求移動端末電
話番号）を送信する（図６の２７）。認証結果が正しく
ない場合は切替元情報を応答しない。(7) When the switching source base station 2 receives the authentication information from the switching destination base station (S26 in FIG. 6), it checks its contents and the result of the authentication response is correct (valid). ), The switching source information (switching source base station-ID, switching source base station accommodating exchange-ID, handover request mobile terminal telephone number) is transmitted (27 in FIG. 6). If the authentication result is incorrect, the switching source information is not responded.
【００３５】(8) これを受信した切替先の基地局３は切
替元情報を送り返してきた基地局２を切替元と特定し
（図６のＳ３８），対移動端末部に通知する。 (9) 対移動端末部は局間ハンドオーバの契機信号として
切替元情報を付加した呼設定要求（ＳＥＴＵＰ）を局交
換機に送信する（図６のＳ３９）。(8) Upon receiving this, the switching destination base station 3 identifies the base station 2 that has returned the switching source information as the switching source (S38 in FIG. 6) and notifies the mobile terminal unit. (9) The mobile terminal unit transmits a call setup request (SETUP) to which the switching source information is added to the central office exchange as an inter-office handover trigger signal (S39 in FIG. 6).
【００３６】(10)局交換機は局間ハンドオーバ（パス切
替え）を実行する。このようにして，異なる事業者の基
地局が混在している場合のハンドオーバや，にせのハン
ドオーバの要求等の悪意呼に対しても，基地局−基地局
間の認証を行うことにより防止することができる。(10) The central office executes inter-office handover (path switching). In this way, it is possible to prevent a malicious call such as a request for a handover or a fake handover when base stations of different operators coexist by performing authentication between the base station and the base station. Can be.
【００３７】図７は実施例１及び実施例３における切替
元の基地局における制御フローであり，上記実施例１及
び実施例３において，切替先の基地局からの問い合わせ
に対する応答をするか否かの判定機能の詳細を示す。図
中，１，２は上記図４（実施例１），図６（実施例３）
と同様に移動端末，切替元の基地局を表す。FIG. 7 is a control flow in the switching source base station in the first and third embodiments. In the first and third embodiments, whether or not to respond to the inquiry from the switching destination base station is determined. The details of the determination function are shown below. In the figure, reference numerals 1 and 2 denote the above-mentioned FIG. 4 (Example 1) and FIG.
Similarly, represents the mobile terminal and the switching source base station.
【００３８】移動端末１からハンドオーバ呼設定要求を
発生した後，切替元の基地局２が切替先の基地局（図示
省略）から切替元情報の収集信号を受け取ると（図７の
Ｓ２２），対移動端末部に対し，該当移動端末について
の状態を問い合わせる。これにより，対移動端末部は該
当電番が通信中か判別する（図７のＳ２３）。通信中で
ない場合は無応答であるが（同Ｓ２５），通信中である
場合には，次にその詳細について判別する（同Ｓ２
４）。すなわち，網切断中，網切断応答待ち，端末切断
中，端末切断応答待ちの何れかに該当する場合は，無応
答とし，それ以外の状態である時だけ切替先の基地局に
対し応答する（図７のＳ２６）。After a handover call setting request is generated from the mobile terminal 1, when the switching source base station 2 receives a switching source information collection signal from a switching destination base station (not shown) (S22 in FIG. 7), Inquires the mobile terminal about the status of the mobile terminal. Thus, the mobile terminal unit determines whether the corresponding telephone number is communicating (S23 in FIG. 7). If no communication is in progress, there is no response (S25), but if communication is in progress, the details are then determined (S2).
4). That is, if any of network disconnection, network disconnection response waiting, terminal disconnection, and terminal disconnection response waiting is applicable, no response is returned, and only when the terminal is in any other state, a response is made to the switching destination base station ( S26 in FIG. 7).
【００３９】この応答として，上記実施例１（図４）の
場合は切替元情報を応答し（図４のＳ２５），上記実施
例３の場合は個別制御チャネル設定を送信する（図６の
Ｓ２４）。As the response, in the case of the first embodiment (FIG. 4), the switching source information is responded (S25 of FIG. 4), and in the case of the third embodiment, the individual control channel setting is transmitted (S24 of FIG. 6). ).
【００４０】上記の各実施例１〜３により，移動端末１
の局間ハンドオーバを実行する場合，切替元回線の切断
はハンドオーバ自体の契機が切替先の基地局３から与え
られるため，網からの切断を待つか，移動端末１と切替
元の基地局２の間の同期が外れたことを検出する必要が
ある。その際に実際に移動端末１が別の基地局３の配下
に移動してから切断処理に移るまでに若干の回線の無効
保留時間が生じる。According to each of the first to third embodiments, the mobile terminal 1
When the inter-station handover is executed, the switching source line is disconnected from the switching destination base station 3 because the trigger of the handover itself is given from the switching destination line, or the mobile terminal 1 and the switching source base station 2 are disconnected. It is necessary to detect that the synchronization has been lost. At that time, a slight line invalid holding time occurs between the time when the mobile terminal 1 actually moves under the control of another base station 3 and the time when the processing shifts to the disconnection processing.
【００４１】図８は回線の無効保留時間を短縮するため
の制御シーケンスである。この制御シーケンスにより基
地局間通信を利用して切替元の基地局に対して回線の切
断契機を与え，無効保留時間を短縮する。FIG. 8 shows a control sequence for shortening the line invalid holding time. With this control sequence, the opportunity of line disconnection is given to the switching source base station using the communication between the base stations, thereby reducing the invalid holding time.
【００４２】図８の移動端末１，切替元の基地局２及び
切替先の基地局３において，移動端末１からのハンドオ
ーバ呼設定要求の送信（図８のＳ１１）を行って，それ
以降の制御シーケンスにより切替先の基地局３において
上位の局交換機に対し呼設定要求（ＳＥＴＵＰ）の送信
（図８のＳ３６）を行うまでは，上記実施例１の場合と
同様であり，説明を省略する。なお，実施例２及び実施
例３の制御シーケンスを経て呼設定要求（ＳＥＴＵＰ）
を送信する状態になった場合にも，これ以後の制御を適
用できる。The mobile terminal 1, the switching source base station 2 and the switching destination base station 3 of FIG. 8 transmit a handover call setting request from the mobile terminal 1 (S11 in FIG. 8), and perform control thereafter. Until the switching destination base station 3 transmits a call setup request (SETUP) to a higher-level central office exchange (S36 in FIG. 8), the process is the same as in the first embodiment, and a description thereof will be omitted. Note that a call setup request (SETUP) is sent through the control sequence of the second and third embodiments.
Is transmitted, the subsequent control can be applied.
【００４３】呼設定要求（ＳＥＴＵＰ）で局間ハンドオ
ーバの契機信号を基地局３の局交換機に通知した後，局
交換機から呼設定応答を受け取ると，移動端末１に対し
呼設定応答を通知する（図８のＳ３７）と共に，基地局
３の対基地局部から切替元回線の切断要求を切替元の基
地局２に送信する（同Ｓ３８）。移動端末１は呼設定応
答を受信する（同Ｓ１２）。また，切替元の基地局２は
この切替元回線切断要求を受信すると（同Ｓ２６），切
替元の基地局２の対移動端末部から，その局交換機に対
し捕捉中回線の切断要求（ＤＩＳＣで表示）を行う（同
Ｓ２７）。これにより，切替元の回線が切断されて，ハ
ンドオーバ（パス切替）が実行される。After the inter-office handover trigger signal is notified to the central office of the base station 3 by a call establishment request (SETUP), when a call establishment response is received from the central office, the call establishment response is notified to the mobile terminal 1 ( Along with S37 in FIG. 8, a request to disconnect the switching source line is transmitted from the base station unit of the base station 3 to the switching source base station 2 (S38). The mobile terminal 1 receives the call setting response (S12). When the switching source base station 2 receives the switching source line disconnection request (S26), the mobile terminal unit of the switching source base station 2 requests the local exchange to disconnect the line being captured (DISC). Display) (S27). As a result, the switching source line is disconnected, and handover (path switching) is performed.
【００４４】[0044]
【発明の効果】本発明によれば，基地局は一つの局交換
機とだけ回線を接続し，移動端末は一つの基地局との間
でだけ通信回線を持ち，網の構成に関する情報を持た
ず，移動している端末が別の基地局との通信が可能であ
る場合，端末より要求することにより基地局の切替を行
うＰＨＳ等の移動通信方式において，局間にまたがるハ
ンドオーバを短時間で実現することが可能となる。ま
た，異なる事業者の基地局が混在している場合やハンド
オーバの悪意呼を防止することが可能となる。According to the present invention, a base station connects a line to only one central office, a mobile terminal has a communication line only to one base station, and has no information about the network configuration. When a moving terminal can communicate with another base station, a handover between stations can be realized in a short time in a mobile communication system such as a PHS that switches the base station by requesting from the terminal. It is possible to do. Further, it is possible to prevent a case where base stations of different operators are mixed and a malicious call of handover is prevented.
【図１】本発明の第１の原理構成を示す図である。FIG. 1 is a diagram showing a first principle configuration of the present invention.
【図２】本発明の第２の原理構成を示す図である。FIG. 2 is a diagram showing a second principle configuration of the present invention.
【図３】基地局のブロック構成図である。FIG. 3 is a block diagram of a base station.
【図４】実施例１の局間ハンドオーバの制御シーケンス
を示す図である。FIG. 4 is a diagram illustrating a control sequence of an inter-station handover according to the first embodiment.
【図５】実施例２の局間ハンドオーバの制御シーケンス
を示す図である。FIG. 5 is a diagram illustrating a control sequence of an inter-station handover according to the second embodiment.
【図６】実施例３の局間ハンドオーバの制御シーケンス
を示す図である。FIG. 6 is a diagram illustrating a control sequence of an inter-station handover according to a third embodiment.
【図７】実施例１及び実施例３における切替元の基地局
における制御フローを示す図である。FIG. 7 is a diagram illustrating a control flow in a switching source base station according to the first and third embodiments.
【図８】回線の無効保留時間を短縮するための制御シー
ケンスである。FIG. 8 is a control sequence for shortening the line invalid hold time.
【図９】従来例の説明図である。FIG. 9 is an explanatory diagram of a conventional example.
１ 移動端末 １ａ ハンドオーバ要求部 ２ 切替元の基地局 ２ａ 切替元情報応答部 ３ 切替先の基地局 ３ａ 切替元情報収集部 ３ｂ 局間ハンドオーバ要求部 ４ 切替元の局交換機 ５ 切替先の局交換機 DESCRIPTION OF SYMBOLS 1 Mobile terminal 1a Handover request part 2 Switching source base station 2a Switching source information responding part 3 Switching destination base station 3a Switching source information collecting part 3b Inter-station handover request part 4 Switching source office exchange 5 Switching destination office exchange
Claims (6)
続され，移動端末が網構成に関する情報を持たずに一つ
の基地局とだけ通信回線を持ち，通信中に回線不良にな
ると移動端末から切替えを要求することによりハンドオ
ーバを行う移動体通信システムにおいて，前記各基地局
は周辺基地局との間の通信手段を備え，前記移動端末が
切替元の基地局を介した通信の回線が不良になってハン
ドオーバ要求を前記切替元の基地局が収容された局交換
機と異なる局交換機に収容された切替先の基地局が受信
すると，前記切替先の基地局は前記ハンドオーバ要求を
行った移動端末の切替元情報を要求する信号を他の基地
局に対し送信し，前記切替元の基地局から当該基地局の
識別情報，当該基地局が収容された局交換機の識別情報
を含む前記移動端末の切替元情報を受信する切替元情報
収集部を備え，前記切替先の基地局は受信した切替元情
報を用いて自局の上位の局交換機に対し局ハンドオーバ
を送信することを特徴とする移動体端末の局間ハンドオ
ーバ方式。A mobile terminal has a communication line with only one base station without information on network configuration, and each mobile station has a communication line with only one base station. In a mobile communication system in which handover is performed by requesting switching from a base station, each of the base stations is provided with communication means for communicating with a neighboring base station, and the mobile terminal has a faulty communication line through the base station of the switching source. When the handover request is received by the switching destination base station accommodated in a central office different from the central office accommodating the switching source base station, the switching destination base station transmits the handover request to the mobile terminal that has issued the handover request. Transmitting a signal requesting the switching source information of the mobile terminal to another base station, the mobile terminal including the identification information of the base station from the switching source base station, and the identification information of the central office accommodating the base station. A switching source information collecting unit for receiving the switching source information of the mobile station, wherein the base station of the switching destination transmits a station handover to a central office exchange higher than the local station using the received switching source information. An inter-station handover method for mobile terminals.
続され，移動端末が網構成に関する情報を持たずに一つ
の基地局とだけ通信回線を持ち，通信中の端末が回線不
良になった時端末から要求することにより基地局の切替
えを行う移動体通信システムにおいて，前記各基地局は
周辺基地局との間の通信機能を備え，前記移動端末が通
信中の基地局は，前記移動端末からの無線通信の電界強
度を測定して一定の閾値より弱いかを判定する電界強度
判定部と前記電界強度判定部により電界強度が弱いこと
を検出すると当該移動端末の番号，当該基地局の識別情
報，当該基地局が収容された局交換機の識別情報を含む
切替元情報を周囲の基地局に送信する切替元情報送信部
を備え，前記切替元の基地局が収容された局交換機と異
なる局交換機に収容された切替先の基地局は，前記切替
元の基地局からの切替元情報を受信すると該情報を保持
して，一定時間内に前記切替元情報に含まれた移動端末
からのハンドオーバ要求を受信すると，前記切替元情報
を用いて自局の上位の局交換機に対し局間ハンドオーバ
を送信することを特徴とする移動体端末の局間ハンドオ
ーバ方式。2. Each of the base stations is connected to only one central office, and the mobile terminal has a communication line with only one base station without information on the network configuration, and the terminal during communication becomes defective. In a mobile communication system in which a base station is switched by a request from a terminal when the mobile terminal is in communication, each base station has a communication function with a peripheral base station, and the base station with which the mobile terminal is communicating is the mobile station. The number of the mobile terminal, the number of the base station and the number of the mobile terminal when the electric field strength of the mobile terminal is detected by measuring the electric field strength of the wireless communication from the terminal to determine whether the electric field strength is weaker than a certain threshold value. A switching source information transmitting unit that transmits switching source information including identification information and identification information of a central office exchange accommodating the base station to surrounding base stations, and is different from the central office exchange accommodating the switching source base station; Housed in central office Upon receiving the switching source information from the switching source base station, the switched switching destination base station retains the information and receives a handover request from the mobile terminal included in the switching source information within a predetermined time. Then, an interoffice handover method for a mobile terminal, characterized in that an interoffice handover is transmitted to a central office exchange higher than the own station using the switching source information.
は前記切替元情報を受信して，予め設定された時間内に
前記切替元情報が指示する移動端末からのハンドオーバ
要求を受け取らないと，前記受信した情報を廃棄するこ
とを特徴とする移動体端末の局間ハンドオーバ方式。3. The switching base station according to claim 2, wherein the switching destination base station receives the switching source information and does not receive a handover request from a mobile terminal indicated by the switching source information within a preset time. , An inter-station handover method for a mobile terminal, wherein the received information is discarded.
は，前記切替先の基地局から移動端末番号を含む切替元
情報を要求する信号を受信すると，該当移動端末が通信
中か判別して，通信中である場合に前記切替元情報を送
信することを特徴とする移動体端末の局間ハンドオーバ
方式。4. The mobile station according to claim 1, wherein the switching source base station receives a signal requesting switching source information including a mobile terminal number from the switching destination base station, and determines whether the mobile terminal is communicating. And transmitting the switching source information when communication is being performed.
は，前記切替先の基地局から移動端末番号を含む切替元
情報を要求する信号を受信すると，前記切替先の基地局
に対し個別制御回線の設定要求を送信し，個別制御回線
が設定されると基地局の事業者を表す情報を含む符号を
送信し，前記切替先の基地局は前記符号を受信して，前
記符号から正当性を認証すると前記切替元の基地局へ送
信し，前記切替元の基地局は前記認証を受け取ることに
より，切替元情報を切替先の基地局へ応答することを特
徴とする移動体端末の局間ハンドオーバ方式。5. The switching source base station according to claim 1, wherein the switching source base station receives a signal requesting switching source information including a mobile terminal number from the switching destination base station. A request for setting a control line is transmitted, and when an individual control line is set, a code including information indicating a carrier of the base station is transmitted. The base station of the switching destination receives the code and receives a code from the code. The mobile terminal transmits a response to the switching base station to the switching source base station, and transmits the switching source information to the switching destination base station by receiving the authentication. Handover method.
替先の基地局が切替元情報を用いて上位の局交換機に対
し局間ハンドオーバのための呼設定要求を送出して呼設
定応答を受け取ると，前記切替元の基地局に対し切替元
回線切断要求を送信し，前記切替元の基地局は前記切替
元回線切断要求を受け取ると，自基地局が収容された局
交換機に対し回線切断要求を送出することにより切替元
の回線の無効保留時間を短縮することを特徴とする移動
体端末の局間ハンドオーバ方式。6. The call setting response according to claim 1, wherein the base station of the switching destination transmits a call setting request for an interoffice handover to an upper central office using the switching source information. , A switching source line disconnection request is transmitted to the switching source base station. When the switching source base station receives the switching source line disconnection request, the switching source base station transmits a line switching request to the central office exchange accommodating its own base station. An inter-station handover method for a mobile terminal, characterized in that by sending a disconnection request, the invalid hold time of the switching source line is reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8173468A JPH1023501A (en) | 1996-07-03 | 1996-07-03 | Inter-station hand-over system for mobile terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8173468A JPH1023501A (en) | 1996-07-03 | 1996-07-03 | Inter-station hand-over system for mobile terminal equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1023501A true JPH1023501A (en) | 1998-01-23 |
Family
ID=15961047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8173468A Withdrawn JPH1023501A (en) | 1996-07-03 | 1996-07-03 | Inter-station hand-over system for mobile terminal equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1023501A (en) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031007 |