JPH09163442A - Unwanted channel releasing method for mobile communication system - Google Patents
Unwanted channel releasing method for mobile communication systemInfo
- Publication number
- JPH09163442A JPH09163442A JP7313967A JP31396795A JPH09163442A JP H09163442 A JPH09163442 A JP H09163442A JP 7313967 A JP7313967 A JP 7313967A JP 31396795 A JP31396795 A JP 31396795A JP H09163442 A JPH09163442 A JP H09163442A
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- JP
- Japan
- Prior art keywords
- channel
- communication
- mobile
- station
- communication channel
- 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.)
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Links
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- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、生起した呼に対し
移動局の在圏の有無にかかわらずシステム内の一部の無
線ゾーンまたは全ての無線ゾーンに通話チャネルを割り
当て、複数の無線ゾーンにまたがって単信または半複信
方式により無線通信を行う移動通信システムに関し、特
に通話対象移動局が在圏しない無線ゾーンの基地局に割
り当てられた不要チャネルの解放方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention assigns a communication channel to some or all radio zones in a system regardless of the presence or absence of a mobile station in response to an originated call, and to a plurality of radio zones. In addition, the present invention relates to a mobile communication system that performs wireless communication by a simplex or semi-duplex system, and particularly to a method of releasing an unnecessary channel allocated to a base station in a wireless zone in which a mobile station to be called does not exist.
【０００２】[0002]
【従来の技術】業務用無線システムやＭＣＡシステム等
の自営用移動通信システムでは、通信方式として単信方
式や、発呼側が複信方式で着呼側が単信方式である半複
信方式が採用されている。単信方式による通信では、１
つの通話チャネルに複数の移動局が接続されるため、通
常１つの移動局のみが送信を行い他の移動局は送信を停
止して送信中の移動局の通信を基地局を介して受信する
受信状態としている。2. Description of the Related Art In a private mobile communication system such as a business radio system or an MCA system, a simplex system or a half-duplex system in which a calling side is a duplex system and a called side is a simplex system is adopted as a communication system. Have been. In simplex communication, 1
Since a plurality of mobile stations are connected to one communication channel, usually only one mobile station transmits, and the other mobile stations stop transmitting and receive communication of the transmitting mobile station via the base station. State.
【０００３】こうした単信方式や半複信方式を採用し、
複数の無線ゾーンにまたがって通信を行うような方式と
しては、例えば特開平２−１１９３２６号公報や特開平
２−１１９３２７号公報に開示されているものがある。
ここで特開平２−１１９３２６号公報の通信方式では、
１つの通話要求に対して着呼側移動局の在圏の有無にか
かわらず全ての無線ゾーンに通話チャネルの割り当てを
行っている。また、特開平２−１１９３２７号公報の通
信方式では、１つの通話要求に対して、呼の呼出番号に
予め定められている無線ゾーンのみに通話チャネルの割
り当てを行い、割り当てられた通話チャネルを介して無
線通信を行っている。[0003] Adopting such simplex system and semi-duplex system,
As a method of performing communication over a plurality of wireless zones, there is a method disclosed in, for example, JP-A-2-119326 and JP-A-2-119327.
Here, in the communication system of Japanese Patent Application Laid-Open No. 2-119326,
In response to one call request, a call channel is assigned to all wireless zones regardless of the presence or absence of the called mobile station. In the communication method disclosed in Japanese Patent Laid-Open No. 2-119327, a call channel is assigned to only one radio zone predetermined for the call number of a call in response to one call request, and the call channel is assigned via the assigned call channel. Wireless communication.
【０００４】[0004]
【発明が解決しようとする課題】このように従来の移動
通信システムでは、着呼側移動局の在圏の有無にかかわ
らず全ての無線ゾーンに通話チャネルの割り当てを行う
か、または予め定めた無線ゾーンに通話チャネルを割り
当てているため、移動局が在圏しな無線ゾーンに割り当
てた通話チャネルが無駄になり、従って無線周波数を有
効に利用できないという問題があった。As described above, in the conventional mobile communication system, a communication channel is allocated to all radio zones regardless of the presence or absence of the called mobile station, or a predetermined radio channel is allocated. Since the communication channels are allocated to the zones, the communication channels allocated to the wireless zones where the mobile stations are not located are wasted, and there is a problem that the radio frequency cannot be used effectively.
【０００５】また、単信方式や半複信方式では、受信状
態の移動局は上述したように送信を停止しているため、
この受信状態の移動局が在圏する無線ゾーンの基地局で
は移動局の在圏の有無を判別できず、従って不要チャネ
ルを解放できないという問題もあった。従って本発明
は、単信方式や半複信方式を採用し、複数の無線ゾーン
にまたがって通信を行うような移動通信システムにおい
て、不要チャネルを解放し無線周波数の有効利用を図る
ことを目的とする。[0005] In the simplex system and the half-duplex system, the mobile station in the receiving state stops transmission as described above.
The base station in the wireless zone in which the mobile station in the reception state is located cannot determine whether the mobile station is located, and thus cannot release an unnecessary channel. Accordingly, an object of the present invention is to release an unnecessary channel and effectively use a radio frequency in a mobile communication system that employs a simplex system or a half-duplex system and performs communication over a plurality of wireless zones. I do.
【０００６】[0006]
【課題を解決するための手段】このような課題を解決す
るために本発明は、制御局と、制御局に接続されると共
に各無線ゾーンを有する複数の基地局と、各基地局と無
線接続される複数の移動局とからなり、各移動局間では
複数の無線ゾーンにまたがって通信を行う移動通信シス
テムにおいて、各基地局では単信方式による通信用に通
話チャネルを割り当てると共に、自身の無線ゾーンに移
動局の在圏が検出できない場合は割り当てた通話チャネ
ルを解放するようにした方法である。従って、不要な通
話チャネルが解放され、無線周波数を有効に利用でき
る。また、各基地局に移動局の送信信号に基づく受信電
界を検出する検出手段を備え、単信方式による通信用に
通話チャネルを割り当てた基地局では通信チャネル上に
受信電界が一定時間検出されないと判断するとこの通話
チャネルに付随する制御チャネルを介して移動局に対し
通話チャネルへの送信指示を行い、この送信指示に対し
て一定時間以内に通話チャネル上に受信電界が検出され
ない場合はこの通話チャネルを解放するようにした方法
である。従って、簡単な構成により不要な通話チャネル
を解放することができる。In order to solve such a problem, the present invention provides a control station, a plurality of base stations connected to the control station and having respective radio zones, and a radio connection with each base station. In a mobile communication system that is composed of a plurality of mobile stations and communicates across a plurality of wireless zones between the mobile stations, each base station allocates a call channel for simplex communication, and This is a method of releasing the assigned communication channel when the presence of the mobile station cannot be detected in the zone. Therefore, unnecessary call channels are released and radio frequencies can be effectively used. Further, each base station is provided with detection means for detecting a received electric field based on a transmission signal of a mobile station, and a base station assigned a communication channel for simplex communication must detect the received electric field on the communication channel for a certain period of time. If judged, the mobile station is instructed to transmit to the communication channel via the control channel attached to this communication channel, and if the received electric field is not detected on the communication channel within a certain time in response to this transmission instruction, this communication channel is It is the method of releasing. Therefore, unnecessary speech channels can be released with a simple configuration.
【０００７】[0007]
【発明の実施の形態】以下、本発明について図面を参照
して説明する。図１は、本発明を適用した移動通信シス
テムの構成を示すブロック図である。同図において、１
は制御局、２1 〜２n は基地局、３1 〜３5 は移動局で
ある。基地局２1 〜２n は、それぞれ無線ゾーン４1 〜
４n を形成し、自身の無線ゾーン内に在圏する移動局と
無線回線を介して接続される。制御局１は、各基地局２
1 〜２n と有線回線または無線回線を介して接続され、
複数の無線ゾーンにまたがって行われる呼の通話路の接
続制御等を行う。なお、図１では、基地局２1 ，２2 ，
２n 以外の基地局、及び移動局３1 〜３5 以外の移動局
は省略している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a mobile communication system to which the present invention is applied. In the figure, 1
Is a control station, 21 to 2n are base stations, and 31 to 35 are mobile stations. The base stations 21 to 2n are respectively connected to the radio zones 41 to 41.
4n and is connected via a radio line to a mobile station located in its own radio zone. The control station 1 is connected to each base station 2
1 to 2n connected via a wired or wireless line,
It performs connection control and the like of a communication path of a call performed over a plurality of wireless zones. In FIG. 1, the base stations 21, 22,.
Base stations other than 2n and mobile stations other than the mobile stations 31 to 35 are omitted.
【０００８】ところで図１では、１つのグループを構成
する各移動局３1 〜３5 が単信方式によってグループ通
信中であることを示している。そしてこの場合、無線ゾ
ーン４1 に在圏する移動局３1 ，３2 は通話チャネルＣ
Ｈ１を介して基地局２1 と無線接続されるとともに、無
線ゾーン４2 に在圏する移動局３3 〜３5 は通話チャネ
ルＣＨ２を介して基地局２2 と無線接続され、かつ当該
通話対象の移動局が在圏しない無線ゾーン４n にも通話
チャネルＣＨｉが割り当てられている。FIG. 1 shows that the mobile stations 31 to 35 forming one group are performing group communication by the simplex method. In this case, the mobile stations 31 and 32 located in the radio zone 41 communicate with the communication channel C.
The mobile stations 33 to 35 located in the wireless zone 42 are wirelessly connected to the base station 22 via the communication channel CH2 while the mobile station 33 to 35 located in the wireless zone 42 is located. The communication channel CHi is also assigned to the wireless zone 4n that is not in service.
【０００９】ここで通話チャネルＣＨ１，ＣＨ２，ＣＨ
ｉは、制御局１において相互に接続され、グループ通信
中の各移動局３1 〜３5 のうち移動局３1 のみが送信を
行って他の移動局３2 〜３5 は移動局３1 からの送信信
号を受信する受信状態となっている。Here, the communication channels CH1, CH2, CH
i are mutually connected in the control station 1 and only the mobile station 31 among the mobile stations 31 to 35 performing group communication performs transmission, and the other mobile stations 32 to 35 receive transmission signals from the mobile station 31. Receiving state.
【００１０】図３はこのような移動通信システムにおい
て通信に使用される各通話チャネルＣＨ１，ＣＨ２，Ｃ
Ｈｉのフレーム構成の一例を示す図である。同図におい
て、Ａはフレーム同期用の同期信号、Ｂは基地局と移動
局間で通話チャネルに付随した制御等を行う制御信号を
伝送するための制御チャネル、Ｃは各移動局間で通話に
よる音声信号等の信号の伝送に使用されるトラヒックチ
ャネルである。FIG. 3 shows each communication channel CH1, CH2, C used for communication in such a mobile communication system.
It is a figure showing an example of Hi frame composition. In the figure, A is a synchronization signal for frame synchronization, B is a control channel for transmitting a control signal for performing control accompanying a communication channel between the base station and the mobile station, and C is a communication channel between each mobile station. This is a traffic channel used for transmitting signals such as voice signals.
【００１１】図２は、本発明の不要チャネル解放方法の
一例を説明するためのシーケンス図であり、図中のは
既に説明した図１の通信状態を示している。即ち、無線
ゾーン４1 に在圏する移動局３1 が送信中の状態であ
り、他の移動局３2 〜３5 は制御局１及び基地局２1 ，
２2 を介して送られてくる移動局２1 の送信信号を受信
している受信中の状態を示している。なお、当該通話対
象移動局が在圏しない無線ゾーン４n に対しても基地局
２n 及び通話チャネルＣＨｉを介し移動局２1 の送信信
号が送られている。FIG. 2 is a sequence diagram for explaining an example of the unnecessary channel releasing method according to the present invention. FIG. 2 shows the communication state of FIG. 1 already described. That is, the mobile station 31 located in the wireless zone 41 is in a transmitting state, and the other mobile stations 32 to 35 are in the control station 1 and the base stations 21 and.
This shows a receiving state in which a transmission signal of the mobile station 21 transmitted via the transmission line 22 is being received. Note that the transmission signal of the mobile station 21 is also sent to the wireless zone 4n in which the target mobile station is not located via the base station 2n and the communication channel CHi.
【００１２】このように、グループ通信等、単信方式に
よる通話では、移動局が在圏しない無線ゾーンに対して
も不要な通話チャネルＣＨｉが割り当てられている。し
かし移動局が在圏しない無線ゾーンの基地局２n では移
動局の在圏は勿論検出できないことから、上述の不要通
話チャネルを解放することはできない。また、送信中の
移動局が在圏しない無線ゾーンの基地局２2 において
も、受信状態となっている各移動局３3 〜３5 の在圏の
有無は検出することはできない。As described above, in a call using a simplex method such as group communication, an unnecessary call channel CHi is allocated to a wireless zone where a mobile station is not located. However, the base station 2n in the wireless zone where the mobile station is not located cannot detect the location of the mobile station as a matter of course, so that the above-mentioned unnecessary communication channel cannot be released. Also, even in the base station 22 in the wireless zone where the transmitting mobile station is not located, it is not possible to detect the presence or absence of the mobile stations 33 to 35 in the receiving state.
【００１３】このため、受信電界の有無により移動局の
在圏の有無が判断できない無線ゾーン４2 ，４n の各基
地局２2 ，２n では、一定時間以上受信電界が検出でき
ない場合は通話チャネルに付随した図３に示す制御チャ
ネルＢを介して移動局に対し時点で送信指示信号を送
出する。この場合、基地局２2 に在圏する各移動局３3
〜３5 では割り当てられている通話チャネルＣＨ２を介
して時点で送信を行う。基地局２2 では、各移動局３
3 〜３5 が通話チャネルＣＨ２を介して送信することに
基づく受信電界を検出して移動局の在圏を確認する。な
お、基地局２2では各移動局３3 〜３5 からの送信信号
が重なって受信されるが、この場合は受信電界の検出の
みを目的としているため、何等問題を生じない。For this reason, in each of the base stations 22 and 2n of the wireless zones 42 and 4n in which the presence or absence of the mobile station cannot be determined based on the presence or absence of the reception electric field, if the reception electric field cannot be detected for a certain period of time or more, it is attached to the communication channel. The transmission instruction signal is transmitted to the mobile station via the control channel B shown in FIG. In this case, each mobile station 33 located in the base station 22
In .about.35, transmission is performed at the point of time via the assigned communication channel CH2. At the base station 22, each mobile station 3
3 to 35 detect the reception electric field based on the transmission via the communication channel CH2 to confirm the location of the mobile station. The base station 22 receives transmission signals from the mobile stations 33 to 35 in an overlapping manner. In this case, since the purpose is only to detect the reception electric field, no problem occurs.
【００１４】一方、基地局２n においては、時点で通
話チャネルＣＨｉの制御チャネルＢを介して送出される
送信指示信号に応答して送信信号を返送する移動局が存
在しないため、その後、何回か送信指示信号の送出を試
みる。しかし、受信電界が検出できないことから移動局
が在圏しないと判断して制御局１に対し時点で移動局
不在報告を送る。制御局１ではこの移動局不在報告を受
信すると、基地局２nに対し時点で通話チャネルＣＨ
ｉの解放指示を行う。On the other hand, in the base station 2 n, there is no mobile station that returns a transmission signal in response to the transmission instruction signal transmitted via the control channel B of the communication channel CHi at the time, so that several times thereafter, Attempt to send a transmission instruction signal. However, since the received electric field cannot be detected, it is determined that the mobile station is not in the service area, and a mobile station absence report is sent to the control station 1 at a time. When the control station 1 receives this mobile station absence report, the control station 1 sends the communication channel CH to the base station 2n at the time.
An instruction to release i is issued.
【００１５】この結果、基地局４n の通話チャネルＣＨ
ｉが当該通話から解放され、従って不要チャネルを解放
することができる。図２の時点は、こうして不要通話
チャネルが解放された状態での通話状況を示すもので、
基地局２n に割り当てられた不要通話チャネルＣＨｉが
解放され、実際に通話を行っている無線ゾーンのみに通
話チャネルが割り当てられていることがわかる。このよ
うに、単信方式や半複信方式で通話が行われる移動通信
システムにおいて、移動局が在圏しない無線ゾーンに割
り当てられている不要な通話チャネルを解放できるた
め、周波数の利用効率を高めることが可能になる。As a result, the communication channel CH of the base station 4n
i is released from the call, and thus the unnecessary channel can be released. The time point in FIG. 2 shows a call situation in a state where the unnecessary call channel is released in this way.
It can be seen that the unnecessary communication channel CHi allocated to the base station 2n is released, and the communication channel is allocated only to the radio zone where the actual communication is being performed. As described above, in a mobile communication system in which communication is performed by the simplex method or the half-duplex method, an unnecessary communication channel allocated to a wireless zone in which a mobile station is not located can be released, thereby improving frequency use efficiency. It becomes possible.
【００１６】[0016]
【発明の効果】以上説明したように本発明によれば、各
基地局では単信方式による通信用に通話チャネルを割り
当てると共に、自身の無線ゾーンに移動局の在圏が検出
できない場合は割り当てた通話チャネルを解放するよう
にしたので、不要な通話チャネルが解放され無線周波数
を有効に利用できる。また、各基地局に移動局の送信信
号に基づく受信電界を検出する検出手段を備え、単信方
式による通信用に通話チャネルを割り当てた基地局では
通信チャネル上に受信電界が一定時間検出されないと判
断するとこの通話チャネルに付随する制御チャネルを介
して移動局に対し通話チャネルへの送信指示を行い、こ
の送信指示に対して一定時間以内に通話チャネル上に受
信電界が検出されない場合はこの通話チャネルを解放す
るようにしたので、簡単な構成により不要な通話チャネ
ルを解放できる。As described above, according to the present invention, each base station allocates a call channel for simplex communication, and when the presence of a mobile station cannot be detected in its own radio zone. Since the call channel is released, the unnecessary call channel is released and the radio frequency can be effectively used. Further, each base station is provided with detection means for detecting a received electric field based on a transmission signal of a mobile station, and a base station assigned a communication channel for simplex communication must detect the received electric field on the communication channel for a certain period of time. If judged, the mobile station is instructed to transmit to the communication channel via the control channel attached to this communication channel, and if the received electric field is not detected on the communication channel within a certain time in response to this transmission instruction, this communication channel is Since it is designed to release the call, unnecessary communication channels can be released with a simple configuration.
【図１】 本発明を適用した移動通信システムの構成を
示すブロック図である。FIG. 1 is a block diagram showing a configuration of a mobile communication system to which the present invention is applied.
【図２】 上記システムの要部動作を示すシーケンス図
である。FIG. 2 is a sequence diagram showing an operation of a main part of the system.
【図３】 上記システムの通話チャネルの構成を示す図
である。FIG. 3 is a diagram showing a configuration of a communication channel of the system.
【符号の説明】 １…制御局、２1 〜２n …基地局、３1 〜３5 …移動
局、４1 〜４n …無線ゾーン、ＣＨ１〜ＣＨｉ…通話チ
ャネル、Ａ…同期信号、Ｂ…制御チャネル、Ｃ…トラヒ
ックチャネル。[Explanation of Codes] 1 ... Control station, 21 to 2n ... Base station, 31 to 35 ... Mobile station, 41 to 4n ... Radio zone, CH1 to CHi ... Call channel, A ... Sync signal, B ... Control channel, C ... Traffic channel.
Claims (2)
無線ゾーンを有する複数の基地局と、各基地局と無線接
続される複数の移動局とからなり、各移動局間では複数
の無線ゾーンにまたがって通信を行う移動通信システム
において、 各基地局では単信方式による前記通信用に通話チャネル
を割り当てると共に、自身の無線ゾーンに移動局の在圏
が検出できない場合は割り当てた通話チャネルを解放す
ることを特徴とする移動通信システムにおける不要チャ
ネル解放方法。1. A control station, a plurality of base stations connected to the control station and having respective wireless zones, and a plurality of mobile stations wirelessly connected to the respective base stations. In a mobile communication system that communicates across wireless zones, each base station assigns a call channel for the above-mentioned communication by a simplex method, and if the presence of the mobile station cannot be detected in its own radio zone, the assigned call channel A method for releasing an unnecessary channel in a mobile communication system, comprising:
る検出手段を備え、単信方式による前記通信用に通話チ
ャネルを割り当てた基地局では通信チャネル上に前記受
信電界が一定時間検出されないと判断するとこの通話チ
ャネルに付随する制御チャネルを介して移動局に対し通
話チャネルへの送信指示を行い、この送信指示に対して
一定時間以内に通話チャネル上に受信電界が検出されな
い場合はこの通話チャネルの解放を行うことを特徴とす
る移動通信システムにおける不要チャネル解放方法。2. The base station according to claim 1, wherein each base station is provided with detection means for detecting a received electric field based on a transmission signal of a mobile station, and a base station to which a communication channel is allocated for the communication by a simplex method is on a communication channel. When it is determined that the received electric field is not detected for a certain period of time, the mobile station is instructed to transmit to the communication channel via the control channel attached to this communication channel, and the transmission instruction is transmitted to the communication channel within a certain time. A method for releasing an unnecessary channel in a mobile communication system, wherein the communication channel is released when a received electric field is not detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7313967A JP2770805B2 (en) | 1995-12-01 | 1995-12-01 | Unnecessary channel release method in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7313967A JP2770805B2 (en) | 1995-12-01 | 1995-12-01 | Unnecessary channel release method in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09163442A true JPH09163442A (en) | 1997-06-20 |
| JP2770805B2 JP2770805B2 (en) | 1998-07-02 |
Family
ID=18047646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7313967A Expired - Lifetime JP2770805B2 (en) | 1995-12-01 | 1995-12-01 | Unnecessary channel release method in mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2770805B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1059739A2 (en) * | 1999-06-11 | 2000-12-13 | Lucent Technologies Inc. | Wireless communications using circuit-oriented and packet-oriented frame selection/distribution functions |
-
1995
- 1995-12-01 JP JP7313967A patent/JP2770805B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1059739A2 (en) * | 1999-06-11 | 2000-12-13 | Lucent Technologies Inc. | Wireless communications using circuit-oriented and packet-oriented frame selection/distribution functions |
| EP1059739A3 (en) * | 1999-06-11 | 2005-09-07 | Lucent Technologies Inc. | Wireless communications using circuit-oriented and packet-oriented frame selection/distribution functions |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2770805B2 (en) | 1998-07-02 |
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