JPH07236170A - Mobile communication system and communication control system - Google Patents
Mobile communication system and communication control systemInfo
- Publication number
- JPH07236170A JPH07236170A JP6023899A JP2389994A JPH07236170A JP H07236170 A JPH07236170 A JP H07236170A JP 6023899 A JP6023899 A JP 6023899A JP 2389994 A JP2389994 A JP 2389994A JP H07236170 A JPH07236170 A JP H07236170A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- mobile station
- communication
- base station
- evacuation
- 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
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、陸上移動局及び基地局
側設備から構成される移動通信システム、特にディジタ
ル方式自動車電話システムにおいて、移動局側制御部で
電波断状態を検出した場合に回線切断から回避させるた
めのシステム及びその際の移動局・基地局間における制
御方法に係り、特に通信の持続性を高めることによりユ
ーザの使い勝手性の向上を目的とした移動通信システム
及び通信制御方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system composed of a land mobile station and base station equipment, and in particular to a digital car telephone system, when a radio wave disconnection state is detected by a mobile station side control unit. The present invention relates to a system for avoiding disconnection and a control method between a mobile station and a base station at that time, and particularly to a mobile communication system and a communication control method for improving usability by improving continuity of communication. .
【０００２】[0002]
【従来の技術】従来ディジタル方式自動車電話システム
における移動局は、クラスタ（周波数繰返し）ゾーンか
らの干渉波等によって基地局より指定されたカラーコー
ド（干渉対策コード）と現在受信中のキャリアのカラー
コードが連続して不一致となる電波断検出時に、現在通
信中であるキャリアを棄却し、待ち受け状態へ移行する
だけの制御となっている。2. Description of the Related Art A mobile station in a conventional digital mobile telephone system is a color code (interference countermeasure code) designated by a base station due to an interference wave from a cluster (frequency repetition) zone and a color code of a carrier currently being received. When the radio wave disconnection is detected, which causes continuous disagreement, the carrier that is currently in communication is rejected, and the control is performed only to shift to the standby state.
【０００３】[0003]
【発明が解決しようとする課題】ディジタル方式自動車
電話システムでは、ディジタル信号である音声信号に対
して誤り検出・訂正を行なうため、Ｃ／Ｎがかなり劣化
した場合でもアナログＦＭのような雑音がほとんど出
ず、ユーザが電波断等によるスケルチ的な回線切断を予
測することは非常に困難であると考える。一方、カラー
コードに対しては誤り検出・訂正を行なわないため、音
声が正常な場合でも制御部の方では電波断状態を検出
し、スケルチ切断が発生するケースが多数あると考えら
れる。In the digital car telephone system, since error detection / correction is performed on a voice signal which is a digital signal, almost no noise such as an analog FM is generated even when the C / N is considerably deteriorated. Without going out, it is very difficult for the user to predict a squelch line disconnection due to a radio wave disconnection or the like. On the other hand, since the color code is not subjected to error detection / correction, it is considered that there are many cases where the control unit detects the radio wave disconnection state and the squelch disconnection occurs even when the voice is normal.
【０００４】この主原因としては、ディジタル方式自動
車電話システムにおける電波断検出時の制御方法は通信
を継続させる試みを行なうこと無く強制的に終了させる
だけの制御となっているため、スケルチ切断を多く発生
させてしまうという不具合を有していると考えられる。The main cause of this is that the control method at the time of detection of a radio wave interruption in a digital car telephone system is a control of forcibly ending it without making an attempt to continue communication, so that squelch disconnection often occurs. It is considered to have a problem that it causes it.
【０００５】本発明の目的は、新たなシステム及び電波
断検出時の制御方式を導入することにより、通信中の呼
損率を従来のものに比べて低下させ、ユーザの使い勝手
性を向上させることにある。An object of the present invention is to reduce the call loss rate during communication as compared with the conventional one by introducing a new system and a control method at the time of detecting a radio wave interruption, and improve the usability for the user. .
【０００６】[0006]
【課題を解決するための手段】本発明によれば、通信の
継続が不可能となる電波断発生時に、通信の継続を試み
るための一時的な避難キャリアが各ゾーン毎に最低１つ
は提供される。According to the present invention, at least one temporary evacuation carrier for each zone is provided for attempting to continue communication when a radio wave interruption occurs where communication cannot be continued. To be done.
【０００７】また本発明によれば、避難キャリア上にお
いて移動局がいつでもアクセスすることが可能な基地局
側設備が提供される。Further, according to the present invention, there is provided equipment on the base station side that can be accessed by a mobile station at any time on the evacuation carrier.
【０００８】更に本発明によれば、通信中の呼損率を低
下させるため、電波断検出時にも通信を継続させるため
の試みを行なう制御方式が提供される。Further, according to the present invention, there is provided a control system for attempting to continue the communication even when the radio wave interruption is detected in order to reduce the call loss rate during the communication.
【０００９】[0009]
【作用】本発明によれば、トンネル内に進入する場合の
ような電波が完全に遮断される電波断検出時を除けば、
カラーコードが連続して不一致となる時はほとんどの場
合がゾーンの端に位置することによるクラスタゾーンか
らの干渉波による影響と考えられるため、避難キャリア
上で基地局から指示される回避先の通常キャリアへ切替
を行なうことにより通信中の呼損率の小さい、使い勝手
の良い移動電話機が提供される。According to the present invention, except when a radio wave interruption is detected in which a radio wave is completely blocked, such as when entering a tunnel,
When the color codes are inconsistent in most cases, it is considered that the interference wave from the cluster zone is most likely to be caused by the fact that they are located at the edge of the zone. By switching to the carrier, it is possible to provide a convenient mobile telephone with a low call loss rate during communication.
【００１０】[0010]
【実施例】図１は、ある無線ゾーンにおいて通常キャリ
アと避難キャリアを用いて通信を行なっている移動局及
び基地局を示したものである。図１に示す移動局１２の
基本動作である、待ち受け動作、発着信接続動作、通信
中動作、切断動作等は通常キャリア１０を用いて行な
う。基地局１３は発着信接続動作において通信チャネル
が起動すると、周辺ゾーンキャリアのレベル監視を移動
局に開始させるために図３に示す無線状態報告情報メッ
セ−ジを用いて周辺ゾーンのとまり木チャネル番号３０
を通知する。これと同時に周辺ゾーンの避難キャリア１
１の周波数コード３１も通知する。移動局はこの情報に
基づき、自ゾーン及び周辺ゾーンの通常キャリアと周辺
ゾーンの避難キャリアの受信レベルを測定する。通信中
に移動局が電波断状態を検出すると、図２に示す電波断
検出時処理フローに基づいて受信レベルの最も高い避難
キャリアから同期信号を受信し、起動を試みる。移動局
が避難キャリアの起動に成功した場合は、周辺ゾーンの
回避先の通常キャリアへの切替の指示を仰ぐため、図４
に示す無線状態報告３メッセージを用いて測定した周辺
ゾーンの通常キャリアの受信レベル４０を基地局へ報告
する。基地局は移動局からの報告結果より周辺ゾーンに
接続可能な通常キャリアが存在すると判断した場合、移
動局に対して回避先の通常キャリアへの切替の指示を行
なう。その後、移動局が基地局より指示されたキャリア
へ切替を行なうことにより、途中で終了すること無く通
信がそのまま継続される。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a mobile station and a base station that communicate with each other by using a normal carrier and an evacuation carrier in a certain wireless zone. The carrier 10, which is the basic operation of the mobile station 12 shown in FIG. When the communication channel is activated in the outgoing / incoming call connection operation, the base station 13 uses the radio status report information message shown in FIG.
To notify. At the same time, evacuation carrier 1 in the surrounding zone
The frequency code 31 of 1 is also notified. Based on this information, the mobile station measures the reception levels of normal carriers in its own zone and surrounding zones and evacuation carriers in the surrounding zones. If the mobile station detects a radio wave interruption state during communication, it receives a synchronization signal from the evacuation carrier with the highest reception level based on the radio wave interruption detection process flow shown in FIG. 2 and attempts activation. When the mobile station succeeds in starting the evacuation carrier, it asks for an instruction to switch to the normal carrier that is the avoidance destination of the peripheral zone.
The reception level 40 of the normal carrier in the peripheral zone measured by using the radio condition report 3 message shown in (3) is reported to the base station. When the base station determines from the report result from the mobile station that there is a normal carrier that can be connected to the surrounding zone, it instructs the mobile station to switch to the avoiding normal carrier. After that, the mobile station switches to the carrier instructed by the base station, so that the communication is continued without being terminated halfway.
【００１１】[0011]
【発明の効果】以上説明したように本発明によれば、従
来のシステム及び制御方式では回線切断を余儀なくされ
ていた電波断検出時にも、接続可能な周辺ゾーンのキャ
リアへの切替を試みることにより、従来に比べて通信中
の呼損率を大幅に低下させることが可能となり、大変使
い勝手の良い移動電話機を提供することができる。As described above, according to the present invention, by attempting to switch to a carrier in a connectable peripheral zone even when detecting a radio wave disconnection, which is forced to disconnect the line in the conventional system and control method. It is possible to significantly reduce the call loss rate during communication as compared with the related art, and it is possible to provide a mobile telephone with excellent usability.
【図１】無線ゾーンにおいて通常キャリアと避難キャリ
アを用いて通信を行なっている移動局及び基地局を示す
図である。FIG. 1 is a diagram showing a mobile station and a base station communicating with each other using a normal carrier and an evacuation carrier in a wireless zone.
【図２】電波断検出時の制御処理を示すフローチャート
である。FIG. 2 is a flowchart showing a control process at the time of detecting a radio wave interruption.
【図３】基地局が移動局に周辺ゾーンキャリアのレベル
監視を開始させるために送出するメッセージを示す図で
ある。FIG. 3 is a diagram showing a message sent by a base station to cause a mobile station to start level monitoring of a peripheral zone carrier.
【図４】移動局が基地局に周辺ゾーンの回避先の通常キ
ャリアへの切替の指示を仰ぐために報告するメッセージ
を示す図である。FIG. 4 is a diagram showing a message that the mobile station reports to ask the base station for an instruction to switch to a normal carrier that is a avoidance destination of a peripheral zone.
１０…通常キャリア、 １１…避難キャリア、 １２…移動局、 １３…基地局、 ３０…周辺ゾーンの通常キャリアのとまり木チャネル番
号、 ３１…周辺ゾーンの避難キャリアの周波数コード、 ４０…周辺ゾーンの通常キャリアのとまり木チャネル番
号及び受信レベル。10 ... Normal carrier, 11 ... Evacuation carrier, 12 ... Mobile station, 13 ... Base station, 30 ... Perimeter channel number of normal carrier in peripheral zone, 31 ... Frequency code of evacuation carrier in peripheral zone, 40 ... Normal carrier in peripheral zone Perch channel number and reception level.
Claims (9)
れ、通信の継続が不可能となる電波断発生時にも、通信
の継続を試みるための一時的な避難キャリアを各ゾーン
毎に最低１つは配備することを特徴とする移動通信シス
テム。1. At least one temporary evacuation carrier for each zone, which consists of a land mobile station and base station equipment, tries to continue communication even when a radio wave interruption occurs where communication cannot be continued. One is a mobile communication system characterized by being deployed.
があるまでは常に同期確立のための信号を送出している
避難キャリアを有することを特徴とする移動通信システ
ム。2. The mobile communication system according to claim 1, further comprising an evacuation carrier that constantly sends a signal for establishing synchronization until there is an access from the mobile station.
ル監視を行なわせている周辺ゾーンの基地局に対し、定
期的にその移動局に関する情報を通知することを特徴と
する移動通信システム。3. A mobile station characterized in that a base station in communication with a mobile station periodically notifies a base station in a peripheral zone which is monitoring the level of the mobile station of information about the mobile station. Communications system.
動を掛けられるよう、通信中状態になると基地局が周辺
ゾーンの避難キャリアの周波数コードを移動局に通知す
ることを特徴とする通信制御方式。4. A communication control, characterized in that a base station notifies a mobile station of a frequency code of an evacuation carrier in a peripheral zone when in a communication state so that the mobile station can activate an evacuation carrier when a radio wave interruption is detected. method.
るために、請求項４に記載した周波数コードに基づき、
避難キャリアの受信レベルの測定を行なうことを特徴と
する通信制御方式。5. The mobile station based on the frequency code according to claim 4, for determining the order of starting the evacuation carriers,
A communication control method characterized by measuring the reception level of an evacuation carrier.
した受信レベルの最も高い周辺ゾーンの避難キャリアか
ら同期信号を受信し、起動を試みることを特徴とする通
信制御方式。6. A communication control system, wherein a mobile station receives a synchronization signal from an evacuation carrier in a peripheral zone having the highest reception level according to claim 5, and tries to activate when a radio wave interruption is detected.
移動局が成功した場合、測定した周辺ゾーンの通常キャ
リアの受信レベルを基地局へ報告することを特徴とする
通信制御方式。7. A communication control system characterized in that, when the mobile station succeeds in starting the evacuation carrier according to claim 6, the measured reception level of the normal carrier in the peripheral zone is reported to the base station.
報告結果より接続可能な周辺ゾーンの通常キャリアが存
在すると判断した場合、移動局に対して回避先の通常キ
ャリアへの切替の指示を行なうことを特徴とする通信制
御方式。8. When the base station determines from the reception level report result described in claim 7 that there is a normal carrier in a connectable peripheral zone, the base station instructs the mobile station to switch to the avoiding normal carrier. A communication control method characterized by performing.
指示に基づき、回避先の通常キャリアへの切替を試みる
ことを特徴とする通信制御方式。9. A communication control system, wherein the mobile station attempts switching to a normal carrier as an avoidance destination based on an instruction from the base station described in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6023899A JPH07236170A (en) | 1994-02-22 | 1994-02-22 | Mobile communication system and communication control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6023899A JPH07236170A (en) | 1994-02-22 | 1994-02-22 | Mobile communication system and communication control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07236170A true JPH07236170A (en) | 1995-09-05 |
Family
ID=12123317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6023899A Pending JPH07236170A (en) | 1994-02-22 | 1994-02-22 | Mobile communication system and communication control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07236170A (en) |
-
1994
- 1994-02-22 JP JP6023899A patent/JPH07236170A/en active Pending
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