JPH0669860A - Radio channel congestion control system for mobile communication system - Google Patents
Radio channel congestion control system for mobile communication systemInfo
- Publication number
- JPH0669860A JPH0669860A JP4219963A JP21996392A JPH0669860A JP H0669860 A JPH0669860 A JP H0669860A JP 4219963 A JP4219963 A JP 4219963A JP 21996392 A JP21996392 A JP 21996392A JP H0669860 A JPH0669860 A JP H0669860A
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- Prior art keywords
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- base station
- wireless
- radio
- congestion
- 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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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動通信システムにおけ
る無線チャネル輻輳制御方式に関する。近年、携帯電話
機及び自動車電話機等の移動機の著しい増加に伴い、１
つの基地局の通信ゾーンに多数の移動機が集中し、無線
チャネルの輻輳を生じることがある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio channel congestion control system in a mobile communication system. With the remarkable increase in mobile devices such as mobile phones and car phones in recent years,
A large number of mobile devices may concentrate in the communication zone of one base station, resulting in radio channel congestion.
【０００２】このような場合、移動機の無線通信が不可
能となる場合があるので、そのような輻輳を無くすこと
ができる無線チャネル輻輳制御方式が要望されている。In such a case, there is a case where the wireless communication of the mobile device becomes impossible. Therefore, there is a demand for a wireless channel congestion control method capable of eliminating such congestion.
【０００３】[0003]
【従来の技術】セルラー型の無線回線（基地局）による
移動通信においては、各セルラー内の無線チャネルとし
て固定的に割り当てられた無線周波数を使用しており、
同一セルラー内の複数の移動機が同時に通話できる回線
（無線チャネル）数は有限である。2. Description of the Related Art In mobile communication by a cellular type wireless line (base station), a radio frequency fixedly assigned as a radio channel in each cellular is used,
There is a finite number of lines (radio channels) with which multiple mobile devices in the same cellular phone can talk at the same time.
【０００４】また、現在のセルラー型の移動通信におけ
る無線チャネルの使用方法は、通信開始時に使用できる
無線チャネルの中の電波強度の強いものから優先的に使
用し、電波強度が通話可能な限り同一の無線チャネルを
使用するようになっている。Further, the current method of using a radio channel in cellular type mobile communication is to preferentially use the radio channel having the highest radio field strength among the radio channels available at the start of communication, and the radio field strength is the same as long as a call is possible. To use the wireless channel of.
【０００５】通話中に移動機が移動したために電波強度
が低下した場合は、通話開始時と同様な方法で電波強度
を測定し、通信に有利な電波強度の無線チャネルを送信
している基地局からの無線チャネルを捕捉し、通話状態
を保持したままで基地局の切り替えを行うようになって
いる。When the mobile station moves during a call to reduce the radio field intensity, the radio field intensity is measured in the same manner as at the start of the call, and a base station transmitting a radio channel having a radio field intensity advantageous for communication. The base station is switched while capturing the wireless channel from the device and maintaining the call state.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上述した移
動通信システムにおいては、使用中の無線チャネルの電
波強度の低下が無い場合、同一の基地局の無線チャネル
を継続して使用するため、１つの基地局の通信ゾーンに
使用可能な無線チャネル数を上回る移動機が集中した場
合に、今まで通話を行っていなかった移動機が新規に通
話を開始しようとすると、無線チャネルの輻輳が生じ、
通話ができなくなるといった問題があった。By the way, in the above-mentioned mobile communication system, since the radio channel of the same base station is continuously used when the radio field intensity of the radio channel in use does not decrease, one radio channel is used. When mobile stations that exceed the number of available wireless channels are concentrated in the communication zone of the base station, when a mobile station that was not making a call tries to start a new call, wireless channel congestion occurs,
There was a problem that I could not make a call.
【０００７】これは、次に述べるセルラー型の移動通信
における無線回線の設計構成に起因する。図４に示すよ
うに、電波の届かない地域を無くすため、各基地局Ａ，
Ｂ，Ｃから送出される電波の形成する無線ゾーン１，
２，３は重複しており、各無線ゾーン１，２，３の周辺
部においては、複数の基地局、この例では基地局Ａと
Ｂ、基地局ＢとＣの無線チャネルの使用が可能となる。This is due to the design and construction of the radio line in the cellular type mobile communication described below. As shown in FIG. 4, each base station A,
Radio zone 1 formed by radio waves transmitted from B and C
2 and 3 are overlapped, and it is possible to use the radio channels of a plurality of base stations, in this example, the base stations A and B and the base stations B and C, in the periphery of each radio zone 1, 2, and 3. Become.
【０００８】ここで、移動機が通話を開始する場合に、
無線チャネルの使用率の高い基地局との通信を選択せ
ず、無線チャネルの使用率の低い基地局との通信を選択
することが可能であれば、無線チャネルの輻輳を回避す
ることができる。Here, when the mobile device starts a call,
If it is possible to select communication with a base station with a low wireless channel usage rate without selecting communication with a base station with a high wireless channel usage rate, it is possible to avoid wireless channel congestion.
【０００９】例えば、移動機ｂ１が無線チャネルの使用
率の高い基地局Ｂとの通信を選択せず、無線チャネルの
使用率の低い基地局Ａとの通信を選択することが可能で
あれば、無線チャネルの輻輳を回避することができる。For example, if the mobile station b1 can select communication with the base station A having a low wireless channel usage rate without selecting communication with the base station B having a high wireless channel usage rate, Radio channel congestion can be avoided.
【００１０】しかし、各基地局Ａ〜Ｃからの報知チャネ
ルの送信電力は一定であるため、基地局Ａ〜Ｃの選択に
おいては、図１に各エリアで示すように、報知チャネル
の電波強度の強い基地局から優先的に選択する理論で実
施されている。However, since the transmission power of the broadcast channel from each of the base stations A to C is constant, when the base stations A to C are selected, as shown in each area in FIG. It is implemented based on the theory of preferentially selecting from strong base stations.
【００１１】本発明は、このような点に鑑みてなされた
ものであり、基地局の無線チャネルの使用率の変動に応
じて基地局からの報知チャネルの送信電力を制御するこ
とにより、無線チャネルの輻輳を制御することができる
移動通信システムにおける無線チャネル輻輳制御方式を
提供することを目的としている。The present invention has been made in view of the above circumstances, and controls the transmission power of the broadcast channel from the base station according to the variation of the usage rate of the radio channel of the base station, thereby controlling the radio channel. It is an object of the present invention to provide a radio channel congestion control method in a mobile communication system capable of controlling the congestion of mobile stations.
【００１２】[0012]
【課題を解決するための手段】図１に本発明の移動通信
システムにおける無線チャネル輻輳制御方式の原理図説
明のための基地局のブロック構成図を示し、図２に移動
機のブロック構成図を示す。FIG. 1 shows a block diagram of a base station for explaining a principle diagram of a radio channel congestion control system in a mobile communication system of the present invention, and FIG. 2 shows a block diagram of a mobile device. Show.
【００１３】図１に示す基地局おける本発明の特徴要素
は、無線チャネル使用状況監視手段４１と、送信電力制
御手段４２と、通信中チャネル切替制御手段４３と、無
線状態測定要求生成手段４４と、無線チャネル輻輳しき
い値が記憶された第１記憶手段４５と、無線チャネル輻
輳終了しきい値が記憶された第２記憶手段４６と、無線
状態報告分析手段４７と、無線同期確立手段４８と、垂
直指向性制御手段５０と、水平指向性制御手段５１と、
手段５０及び５１により制御される報知チャネルを送信
するための専用アンテナである。但し、図１において
は、手段５０及び５１を１つのアンテナに接続されたア
ンテナ給電装置２０に接続して専用アンテナへの接続に
代えてある。The characteristic elements of the present invention in the base station shown in FIG. 1 are radio channel usage monitoring means 41, transmission power control means 42, in-communication channel switching control means 43, and radio condition measurement request generation means 44. , A first storage means 45 in which a radio channel congestion threshold value is stored, a second storage means 46 in which a radio channel congestion end threshold value is stored, a radio condition report analysis means 47, and a radio synchronization establishment means 48. Vertical directivity control means 50, horizontal directivity control means 51,
A dedicated antenna for transmitting the broadcast channel controlled by the means 50 and 51. However, in FIG. 1, the means 50 and 51 are connected to the antenna feeding device 20 connected to one antenna, and are replaced with the connection to the dedicated antenna.
【００１４】また、図２に示す移動機における本発明の
特徴要素は、報知チャネル受信電界測定手段７０と、無
線状態要求信号検出手段７１と、しきい値記憶手段７２
と、無線状態報告タイマ手段７３と、無線状態報告信号
生成手段７４と、通信中チャネル切替制御手段７５と、
無線同期確立手段７６とである。The characteristic elements of the present invention in the mobile unit shown in FIG. 2 are broadcast channel reception electric field measuring means 70, radio condition request signal detecting means 71, and threshold value storing means 72.
A wireless status report timer means 73, a wireless status report signal generating means 74, a communicating channel switching control means 75,
Wireless synchronization establishing means 76.
【００１５】一般的に基地局及び移動機により構成され
る移動通信システムは、移動機が、基地局から送信され
る有限な無線チャネルの使用により通話を行っている際
に、他の基地局から送信される無線チャネルに無瞬断で
切り替えを行うことが可能な機能を有している。In general, a mobile communication system composed of a base station and a mobile station sends a call from another base station when the mobile station is making a call by using a finite radio channel transmitted from the base station. It has a function that can switch to a wireless channel to be transmitted without interruption.
【００１６】図１及び図２において、無線チャネル使用
状況監視手段４１は、基地局の無線チャネルの使用率を
監視することにより無線チャネルの輻輳及び輻輳終了を
検出するものである。In FIG. 1 and FIG. 2, the wireless channel usage monitoring means 41 detects the congestion and the end of congestion of the wireless channel by monitoring the usage rate of the wireless channel of the base station.
【００１７】送信電力制御手段４２は、無線チャネル使
用状況監視手段４１により検出される無線チャネルの輻
輳及び輻輳終了に応じて、基地局の報知チャネルの送信
電力を可変するものである。The transmission power control means 42 varies the transmission power of the broadcast channel of the base station according to the congestion of the wireless channel detected by the wireless channel usage status monitoring means 41 and the end of the congestion.
【００１８】第１記憶手段４５に記憶された無線チャネ
ル輻輳しきい値と、第２記憶手段４６に記憶された無線
チャネル輻輳終了しきい値とは、無線チャネル使用状況
監視手段４１が無線チャネルの使用率を監視する際に、
その使用率と比較し、使用率が無線チャネル輻輳しきい
値を越えた場合に無線チャネルの輻輳であると判定し、
使用率が無線チャネル輻輳終了しきい値を下回った場合
に無線チャネルの輻輳終了であると判定するためのもの
である。The radio channel congestion threshold stored in the first storage means 45 and the radio channel congestion end threshold stored in the second storage means 46 are used by the radio channel usage monitoring means 41 for the radio channel When monitoring usage,
Compared with the usage rate, if the usage rate exceeds the wireless channel congestion threshold, it is determined that the wireless channel congestion,
This is for determining that the congestion of the wireless channel has ended when the usage rate falls below the wireless channel congestion end threshold value.
【００１９】垂直指向性制御手段５０は、専用アンテナ
の垂直方向の指向性を可変するものであり、水平指向性
制御手段５１は、専用アンテナの水平方向の指向性の角
度を可変するものである。The vertical directivity control means 50 varies the vertical directivity of the dedicated antenna, and the horizontal directivity control means 51 varies the horizontal directivity angle of the dedicated antenna. .
【００２０】報知チャネル受信電界測定手段７０は、報
知チャネルの受信電界を測定するものである。移動機の
通信中チャネル切替制御手段７５は、報知チャネル受信
電界測定手段７０により測定された最も強い電界の報知
チャネルを送信する基地局からの無線チャネルに切り替
えを行うものである。The broadcast channel received electric field measuring means 70 measures the received electric field of the broadcast channel. The in-communication channel switching control means 75 of the mobile device switches to the wireless channel from the base station which transmits the broadcast channel having the strongest electric field measured by the broadcast channel reception electric field measuring means 70.
【００２１】基地局の無線同期確立手段４８は、移動機
との無線通信の同期を確立するものであり、移動機の無
線同期確立手段７６は、基地局との無線通信の同期を確
立するものである。The base station radio synchronization establishing means 48 establishes radio communication synchronization with the mobile station, and the mobile station radio synchronization establishing means 76 establishes radio communication synchronization with the base station. Is.
【００２２】無線状態報告信号生成手段７４は、報知チ
ャネル受信電界測定手段７０で測定された報知チャネル
の受信電界強度を通話中の基地局へ報告するものであ
る。無線状態報告タイマ手段７３は、報知チャネル受信
電界測定手段７０で測定された報知チャネルの受信電界
強度を一定間隔で無線状態報告信号生成手段７４へ報告
するものである。The radio condition report signal generating means 74 reports the reception electric field strength of the broadcast channel measured by the broadcast channel reception electric field measuring means 70 to the base station in communication. The radio status report timer means 73 reports the reception electric field strength of the broadcast channel measured by the broadcast channel reception electric field measurement means 70 to the radio status report signal generation means 74 at regular intervals.
【００２３】無線状態測定要求生成手段４４は、自己及
び周辺の基地局と通話中の移動機に対して無線状態の測
定要求を行うものである。無線状態要求信号検出手段７
１は、前記した測定要求を検出するものである。The radio condition measurement request generation means 44 makes a radio condition measurement request to the mobile device in communication with itself and the surrounding base stations. Radio status request signal detecting means 7
1 detects the above-mentioned measurement request.
【００２４】しきい値記憶手段７２は、報知チャネル受
信電界測定手段７０で測定された報知チャネルの受信電
界が所定強度以上となったことを判別するためのしきい
値が記憶されたものである。The threshold value storage means 72 stores a threshold value for discriminating that the received electric field of the broadcast channel measured by the broadcast channel received electric field measuring means 70 has become equal to or higher than a predetermined intensity. .
【００２５】無線状態報告分析手段４７は、無線状態報
告信号生成手段７４から送られてきた移動機が受信して
いる報知チャネルの受信電界強度を分析し、無線チャネ
ルを他の基地局からのものに切り替えるかどうかを決定
するものである。The radio status report analysis means 47 analyzes the received electric field strength of the broadcast channel received by the mobile station sent from the radio status report signal generation means 74, and determines the radio channel from another base station. It decides whether to switch to.
【００２６】基地局の通信中チャネル切替制御手段４３
は、無線状態報告分析手段４７により無線チャネルの切
り替えが決定された場合に、切替先基地局に無線チャネ
ル切り替え要求を通知し、この通知を受けた切替先基地
局にあっては使用可能な無線チャネルが存在する際に切
り替え対象となる移動機の通信中チャネル切替制御手段
７５に対して、切替先の無線ゾーン及び無線チャネル番
号を通知すると共に、先の切替元基地局にあっては無線
チャネルを空き状態とする制御を行うものである。Base station communication channel switching control means 43
When the wireless state report analyzing unit 47 determines to switch the wireless channel, the wireless status report analyzing unit 47 notifies the switching destination base station of the wireless channel switching request, and the switching destination base station that received the notification can use the available wireless channel. When a channel exists, the wireless channel and wireless channel number of the switching destination are notified to the in-communication channel switching control means 75 of the mobile device to be switched, and the wireless channel of the previous switching source base station is notified. Is to be controlled to be in an empty state.
【００２７】[0027]
【作用】上述した本発明によれば、無線チャネル使用状
況監視手段４１により無線チャネルの輻輳が検出された
場合に、送信電力制御手段４２により基地局の報知チャ
ネルの送信電力が下げられて無線ゾーンが縮小する。こ
の縮小により今までよりも無線ゾーン内の移動機の数が
減少するので使用無線チャネルに余裕ができ、無線チャ
ネルの輻輳が防止されることになる。According to the present invention described above, when the wireless channel usage monitoring means 41 detects the congestion of the wireless channel, the transmission power control means 42 lowers the transmission power of the broadcast channel of the base station and the wireless zone. Shrinks. Due to this reduction, the number of mobile devices in the wireless zone is smaller than ever, so that there is a margin in the used wireless channel and the congestion of the wireless channel is prevented.
【００２８】また、無線チャネル使用状況監視手段４１
により無線チャネルの輻輳終了が検出された場合に、送
信電力制御手段４２により基地局の報知チャネルの送信
電力が上げられることにより無線ゾーンが拡大する。こ
の拡大により無線ゾーンを元の状態に復旧させることが
できる。Further, the radio channel usage status monitoring means 41
When the end of congestion of the wireless channel is detected by, the transmission power control unit 42 increases the transmission power of the broadcast channel of the base station, thereby expanding the wireless zone. This expansion can restore the wireless zone to its original state.
【００２９】このようなゾーンの縮小及び拡大は、他
に、垂直指向性制御手段５０により専用アンテナの垂直
方向の指向性を下方に変位させることにより無線ゾーン
を縮小させることができ、垂直方向の指向性を上方に変
位させることにより無線ゾーンを拡大させて復旧させる
ことができる。In addition to such reduction and expansion of the zone, the vertical directivity control means 50 can be used to reduce the vertical directivity of the dedicated antenna to reduce the wireless zone, and the vertical direction can be reduced. By displacing the directivity upward, the wireless zone can be expanded and restored.
【００３０】更には、水平指向性制御手段５１により専
用アンテナの水平方向の指向性の角度を縮小させること
により無線ゾーンを縮小させることができ、水平方向の
指向性の角度を拡大させることにより無線ゾーンを復旧
させることができる。Furthermore, the horizontal directivity control means 51 can reduce the wireless zone by reducing the horizontal directivity angle of the dedicated antenna, and the wireless zone can be expanded by expanding the horizontal directivity angle. The zone can be restored.
【００３１】次に、基地局及び移動機における無線状態
が測定され、通信する基地局が切り替えられる場合につ
いて述べる。先ず、移動機において、基地局からの報知
チャネルの受信電界が報知チャネル受信電界測定手段７
０で常時測定されている。Next, a case will be described in which the radio conditions of the base station and the mobile device are measured and the base station with which communication is performed is switched. First, in the mobile device, the broadcast channel received electric field from the base station is broadcast channel received electric field measuring means 7
It is always measured at 0.
【００３２】この測定された電界強度は無線状態報告タ
イマ手段７３により一定間隔で無線状態報告信号生成手
段７４を介して通話中の基地局へ報告される。基地局の
無線状態測定要求生成手段４４により、自局及び他局の
無線ゾーンの移動機に対して無線状態測定要求が送出さ
れた場合について説明する。The measured electric field strength is reported by the radio status report timer means 73 to the base station in communication via the radio status report signal generating means 74 at regular intervals. A case will be described in which the wireless condition measurement request generation means 44 of the base station sends a wireless condition measurement request to mobile stations in the wireless zones of the own station and the other station.
【００３３】但し、他局に要求が送出される場合は、信
号送受信手段４０、伝送装置３０、及び交換機３１を介
して行われる。無線状態測定要求が移動機の無線状態要
求信号検出手段７１により検出されると、報知チャネル
受信電界測定手段７０での測定結果が無線状態報告信号
生成手段７４を介して、要求を行った基地局へ送出され
る。However, when a request is sent to another station, the request is sent via the signal transmitting / receiving means 40, the transmission device 30, and the exchange 31. When the radio condition request signal is detected by the radio condition request signal detecting means 71 of the mobile device, the measurement result by the broadcast channel reception electric field measuring means 70 is transmitted via the radio condition report signal generating means 74 to the requesting base station. Sent to.
【００３４】この移動機からの測定結果（報知チャネル
の受信電界強度）は、基地局の無線状態報告分析手段４
７で分析され、受信電界強度に応じて他の基地局からの
無線チャネルに切り替えるかどうかが決定される。The measurement result (received field strength of the broadcast channel) from this mobile unit is used as the radio condition report analysis means 4 of the base station.
7, it is determined whether to switch to a radio channel from another base station according to the received electric field strength.
【００３５】切り替えが決定された場合、基地局の通信
中チャネル切替制御手段４３より、信号送受信手段４
０、伝送装置３０、及び交換機３１を介して、切替先基
地局の通信中チャネル切替制御手段４３に対して通信中
チャネル切替の要求が通知される。When the switching is decided, the signal transmitting / receiving means 4 is set by the communicating channel switching control means 43 of the base station.
0, the transmission device 30, and the exchange 31 to notify the in-communication channel switching request to the in-communication channel switching control means 43 of the switching destination base station.
【００３６】切替先基地局において、使用可能な無線チ
ャネルが存在する場合は、通信中チャネル切替制御手段
４３により切替先の無線チャネルの起動が実施され、無
線チャネル切り替え可能な移動機の通信中チャネル切替
制御手段７５へ、切替先の無線ゾーン及び無線チャネル
番号が通知される。When there is a usable wireless channel in the switching destination base station, the in-communication channel switching control means 43 activates the switching destination wireless channel, and the in-communication channel of the mobile device capable of switching the wireless channel. The switching control means 75 is notified of the switching destination wireless zone and wireless channel number.
【００３７】そして、無線同期確立手段４８，７６で切
替先の無線チャネルへの同期が確立した時点で、移動機
の通信中チャネル切替制御手段７５より起動完了が基地
局へ通知され、その後、切替元基地局の通信中チャネル
切替制御手段４３により、無線チャネルが空き状態にさ
れる。When the wireless synchronization establishing means 48 and 76 establish synchronization with the wireless channel of the switching destination, the in-communication channel switching control means 75 of the mobile unit notifies the base station of the completion of activation, and then the switching is performed. The in-communication channel switching control means 43 of the former base station puts the wireless channel in an idle state.
【００３８】[0038]
【実施例】以下、図面を参照して本発明の一実施例につ
いて説明する。図２は本発明の一実施例による移動通信
システムにおける無線チャネル輻輳制御方式を説明する
ための図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram for explaining a radio channel congestion control method in a mobile communication system according to an embodiment of the present invention.
【００３９】但し、図２に示す基地局及び移動機は、前
述の「課題を解決するための手段」及び「作用」の所で
説明した図１及び図２に示す基地局及び移動機と同機能
を有するものとする。However, the base station and the mobile station shown in FIG. 2 are the same as the base station and the mobile station shown in FIGS. 1 and 2 described in the above-mentioned "Means for solving the problem" and "Operation". It has a function.
【００４０】図２において、基地局Ｂ１の無線チャネル
の使用率が１００％に近づいた場合に、未然に新規の移
動機からの通話の開始が困難となることが予測される。
この時、基地局Ｂ１から送信される報知チャネルの送信
電力を低下させることにより、基地局Ｂ１の無線ゾーン
を通常のゾーン８１から符号８２で示すゾーンに縮小す
る。In FIG. 2, when the usage rate of the radio channel of the base station B1 approaches 100%, it is predicted that it will be difficult to start a call from a new mobile device.
At this time, by reducing the transmission power of the broadcast channel transmitted from the base station B1, the wireless zone of the base station B1 is reduced from the normal zone 81 to the zone indicated by reference numeral 82.
【００４１】この縮小によって、図２の網かけで示すエ
リアの内、ゾーン８２よりも外側のエリア８５，８６，
８７，８８で、基地局Ｂ１からの報知チャネルの電界強
度よりも基地局Ａ１及びＣ１からの報知チャネルの電界
強度が強くなる。Due to this reduction, the areas 85, 86 outside the zone 82 in the shaded area in FIG.
At 87 and 88, the electric field strengths of the broadcast channels from the base stations A1 and C1 are stronger than the electric field strengths of the broadcast channel from the base station B1.
【００４２】このような電界強度となったエリア８７に
存在する移動機９１のそれぞれの動作における影響につ
いて説明する。移動機９１が新規に電源をＯＮとしたも
のである場合は、基地局Ｃ１からの報知チャネルの送信
電力が強くなっているので、基地局Ｃ１と同期確立を行
うこととなる。The influence on the operation of each of the mobile units 91 existing in the area 87 having such electric field strength will be described. When the mobile device 91 is newly turned on, the transmission power of the broadcast channel from the base station C1 is high, and therefore synchronization is established with the base station C1.
【００４３】つまり、他のエリア８５，８６，８８に移
動機が存在するとすれば同様の動作を行い基地局Ａ１，
Ｃ１と通信を行うことになるので、基地局Ｂ１における
トラフィックは低下することになる。That is, if there are mobile stations in other areas 85, 86, 88, the same operation is performed and the base stations A1,
Since the communication is performed with C1, the traffic at the base station B1 is reduced.
【００４４】移動機９１が通信中のものである場合は、
移動機９１からの無線状態定期報告により基地局Ｂ１よ
りも他の基地局Ｃ１の報知チャネルを受信するレベルが
高くなったことが分かるので、基地局Ｃ１への無線チャ
ネルへの切り替えが行える。When the mobile device 91 is in communication,
Since it can be seen from the radio condition regular report from the mobile device 91 that the level at which the broadcast channel of the other base station C1 is received is higher than that of the base station B1, it is possible to switch to the radio channel to the base station C1.
【００４５】また、基地局Ｂ１のゾーンが縮小した時に
基地局Ｂ１からの無線状態問い合わせに応じた制御を移
動機９１が実行し、この応答としての無線状態報告を基
地局Ｂ１が受信することにより、基地局Ｃ１の方がＢ１
よりも報知チャネルの送信電力が高いことが認識できる
ので、他の基地局Ｃ１へのチャネル切り替えが実施でき
る。Further, when the zone of the base station B1 is contracted, the mobile station 91 executes control according to the radio status inquiry from the base station B1, and the base station B1 receives the radio status report as a response. , Base station C1 is B1
Since it can be recognized that the transmission power of the broadcast channel is higher than that of the broadcast channel, the channel can be switched to another base station C1.
【００４６】移動機９１が待ち受け状態のものである場
合は、同期確立を行う基地局が他の基地局Ｃ１へ遷移す
るため、通信の開始は他の基地局Ｃ１から実施される。
一方、基地局Ｂ１の無線ゾーンを、ゾーン８２からゾー
ン８１に復旧させた場合について説明する。When the mobile station 91 is in a standby state, the base station for establishing synchronization transits to another base station C1, so that communication is started from the other base station C1.
On the other hand, a case where the wireless zone of the base station B1 is restored from the zone 82 to the zone 81 will be described.
【００４７】移動機９１が新規に電源をＯＮとしたもの
である場合は、基地局Ｂ１からの報知チャネルの送信電
力が復旧し、基地局Ｂ１の無線ゾーンが復旧することに
よって、復旧後の無線ゾーン８１内での移動機９１から
の同期確立は基地局Ｂ１にて行われることになり、トラ
フィックは増加する。When the mobile station 91 is newly turned on, the transmission power of the broadcast channel from the base station B1 is restored and the wireless zone of the base station B1 is restored, so that the restored wireless The establishment of synchronization from the mobile station 91 in the zone 81 is performed by the base station B1 and the traffic increases.
【００４８】移動機９１が通信中のものである場合は、
基地局Ｃ１と通信中であるので、報知チャネルの受信電
力がしきい値を越える場合がある。この場合、移動機９
１からの強電界検出報告が通信中の基地局Ｃ１へ報告さ
れ、基地局Ｂ１へのチャネル切り替えが実施される。When the mobile device 91 is in communication,
Since the base station C1 is in communication with the base station C1, the received power of the broadcast channel may exceed the threshold value. In this case, the mobile device 9
The strong electric field detection report from 1 is reported to the base station C1 in communication, and channel switching to the base station B1 is performed.
【００４９】また、基地局Ｂ１の報知チャネル送信電力
復旧時に、他の基地局Ａ１，Ｃ１からの無線状態問い合
わせを実施し、その応答としての無線状態報告におい
て、基地局Ｂ１の電力が他の基地局Ａ１，Ｃ１よりも高
い場合は、基地局Ｃ１から基地局Ｂ１へのチャネル切り
替えが実施される。Further, when the broadcast channel transmission power of the base station B1 is restored, the radio status inquiry from the other base stations A1 and C1 is performed, and in the radio status report as a response, the power of the base station B1 is changed to another base station. If it is higher than the stations A1 and C1, the channel switching from the base station C1 to the base station B1 is performed.
【００５０】移動機９１が待ち受け状態のものである場
合は、同期確立を行う基地局が他の基地局Ｃ１からこち
らへ遷移するため、通信の開始は基地局Ｂ１から実施さ
れる。When the mobile station 91 is in the standby state, the base station for establishing synchronization transits from another base station C1 to this side, so that the communication is started from the base station B1.
【００５１】以上説明した移動通信システムにおける無
線チャネル輻輳制御方式によれば、無線チャネルの使用
率が高い基地局における無線ゾーン内の移動機に対し
て、自無線ゾーンを縮小することにより、今まで自無線
ゾーンにあった移動機を周辺の基地局の無線ゾーン内へ
移動させることが容易に実現できる。According to the radio channel congestion control method in the mobile communication system described above, by reducing the own radio zone to the mobile station in the radio zone of the base station having a high radio channel usage rate, It is possible to easily realize the movement of the mobile device in the own wireless zone into the wireless zone of the surrounding base station.
【００５２】無線チャネルの使用率の高い基地局での輻
輳の抑制に関する制御が、基地局を制御する上位装置と
しての交換機の制御なしで実施可能となる。The control for suppressing congestion at the base station having a high wireless channel usage rate can be performed without the control of the exchange as a host device for controlling the base station.
【００５３】[0053]
【発明の効果】以上説明したように、本発明によれば、
基地局の無線チャネルの使用率の変動に応じて基地局か
らの報知チャネルの送信電力を制御することにより、無
線チャネルの輻輳を制御することができるので、輻輳に
よる通信の阻害を無くすことができる効果がある。As described above, according to the present invention,
By controlling the transmission power of the broadcast channel from the base station according to the variation of the usage rate of the wireless channel of the base station, it is possible to control the congestion of the wireless channel, it is possible to eliminate the obstruction of communication due to congestion. effective.
【図１】本発明の移動通信システムにおける無線チャネ
ル輻輳制御方式の原理説明を行うための基地局のブロッ
ク構成図である。FIG. 1 is a block configuration diagram of a base station for explaining the principle of a radio channel congestion control method in a mobile communication system of the present invention.
【図２】本発明の移動通信システムにおける無線チャネ
ル輻輳制御方式の原理説明を行うための移動機のブロッ
ク構成図である。FIG. 2 is a block configuration diagram of a mobile device for explaining the principle of the radio channel congestion control method in the mobile communication system of the present invention.
【図３】本発明の一実施例による移動通信システムにお
ける無線チャネル輻輳制御方式を説明するための図であ
る。FIG. 3 is a diagram illustrating a radio channel congestion control method in a mobile communication system according to an embodiment of the present invention.
【図４】従来の移動通信システムを説明するための図で
ある。FIG. 4 is a diagram illustrating a conventional mobile communication system.
４１ 無線チャネル使用状況監視手段 ４２ 送信電力制御手段 ４３ 通信中チャネル切替制御手段 ４４ 無線状態測定要求生成手段 ４５ 第１記憶手段 ４６ 第２記憶手段 ４７ 無線状態報告分析手段 ４８ 無線同期確立手段 ５０ 垂直指向性制御手段 ５１ 垂直指向性制御手段 ７０ 報知チャネル受信電界測定手段 ７１ 無線状態要求信号検出手段 ７２ しきい値記憶手段 ７３ 無線状態報告タイマ手段 ７４ 無線状態報告信号生成手段 ７５ 通信中チャネル切替制御手段 ７６ 無線同期確立手段 41 wireless channel usage status monitoring means 42 transmission power control means 43 in-communication channel switching control means 44 wireless status measurement request generation means 45 first storage means 46 second storage means 47 wireless status report analysis means 48 wireless synchronization establishment means 50 vertical orientation Control means 51 vertical directivity control means 70 broadcast channel reception electric field measurement means 71 radio status request signal detection means 72 threshold value storage means 73 radio status report timer means 74 radio status report signal generation means 75 in-communication channel switching control means 76 Wireless synchronization establishment means
Claims (9)
無線チャネルの使用により通話を行っている際に、他の
基地局から送信される無線チャネルに無瞬断で切り替え
を行うことが可能な機能を有する移動通信システムにお
いて、 前記基地局に、 基地局の無線チャネルの使用率を監視することにより無
線チャネルの輻輳及び輻輳終了を検出する無線チャネル
使用状況監視手段(41)と、 該無線チャネル使用状況監視手段(41)により検出される
無線チャネルの輻輳及び輻輳終了に応じて、基地局の報
知チャネルの送信電力を可変する送信電力制御手段(42)
とを具備し、 前記無線チャネル使用状況監視手段(41)により無線チャ
ネルの輻輳が検出された場合に、前記送信電力制御手段
(42)が基地局の報知チャネルの送信電力を下げることに
より無線ゾーンを縮小させ、この縮小により無線ゾーン
内の移動機の数を減少させて無線チャネルの輻輳を防止
するようにし、また、該無線チャネル使用状況監視手段
(41)により無線チャネルの輻輳終了が検出された場合
に、前記送信電力制御手段(42)が基地局の報知チャネル
の送信電力を上げることにより無線ゾーンを拡大させて
復旧するようにしたことを特徴とする移動通信システム
における無線チャネル輻輳制御方式。1. A mobile device can switch to a wireless channel transmitted from another base station without interruption during a call by using a limited wireless channel transmitted from a base station. In a mobile communication system having possible functions, the base station, a wireless channel usage monitoring means (41) for detecting the congestion and end of congestion of the wireless channel by monitoring the usage rate of the wireless channel of the base station, Transmission power control means (42) for varying the transmission power of the broadcast channel of the base station according to the congestion and end of congestion of the wireless channel detected by the wireless channel usage monitoring means (41)
When the wireless channel congestion is detected by the wireless channel usage monitoring means (41), the transmission power control means
(42) reduces the wireless zone by reducing the transmission power of the broadcast channel of the base station, to reduce the number of mobile devices in the wireless zone by this reduction to prevent congestion of the wireless channel, Wireless channel usage monitoring means
When the end of wireless channel congestion is detected by (41), the transmission power control means (42) expands the wireless zone by increasing the transmission power of the broadcast channel of the base station so as to recover. A radio channel congestion control method for mobile communication systems.
と、無線チャネル輻輳終了しきい値を記憶した第２記憶
手段(46)とを設け、 前記無線チャネル使用状況監視手段(41)が前記無線チャ
ネルの使用率を監視する際に、該第１及び第２記憶手段
(45 及び46) から読み出された無線チャネル輻輳検出し
きい値及び該無線チャネル輻輳終了しきい値と、該使用
率とを比較し、この比較結果、該使用率が該無線チャネ
ル輻輳しきい値を越えた場合に前記無線チャネルの輻輳
であると判定し、該使用率が該無線チャネル輻輳終了し
きい値を下回った場合に前記無線チャネルの輻輳終了で
あると判定するようにしたことを特徴とする請求項１記
載の移動通信システムにおける無線チャネル輻輳制御方
式。2. The first storage means (45) for storing a radio channel congestion threshold value in the base station.
And a second storage means (46) for storing a radio channel congestion termination threshold value. When the radio channel usage status monitoring means (41) monitors the usage rate of the radio channel, the first and second storage means (46) are provided. Second storage means
(45 and 46) compares the radio channel congestion detection threshold and the radio channel congestion end threshold read from (45 and 46) with the utilization rate, and as a result of this comparison, the utilization rate is the radio channel congestion threshold. When it exceeds the value, it is determined that the wireless channel is congested, and when the usage rate is below the wireless channel congestion end threshold, it is determined that the wireless channel is congested. The radio channel congestion control method in the mobile communication system according to claim 1.
性制御手段(50)とを具備し、 該垂直指向性制御手段(50)により該専用アンテナの垂直
方向の指向性を下方に変位させることにより前記無線ゾ
ーンを縮小させ、また、該専用アンテナの垂直方向の指
向性を上方に変位させることにより該無線ゾーンを復旧
させるようにしたことを特徴とする請求項１又は２に記
載の移動通信システムにおける無線チャネル輻輳制御方
式。3. The base station comprises a dedicated antenna for transmitting the broadcast channel, and vertical directivity control means (50) for varying the directivity of the dedicated antenna in the vertical direction. By means of the means (50), the vertical direction of the dedicated antenna is displaced downward to reduce the wireless zone, and by shifting the directivity of the dedicated antenna in the vertical direction upward, the wireless zone is reduced. The wireless channel congestion control method in the mobile communication system according to claim 1 or 2, wherein the wireless channel congestion control method is used for restoration.
平指向性制御手段(51)とを具備し、 該水平指向性制御手段(51)により該専用アンテナの水平
方向の指向性の角度を縮小させることにより前記無線ゾ
ーンを縮小させ、また、該専用アンテナの水平方向の指
向性の角度を拡大させることにより該無線ゾーンを復旧
させるようにしたことを特徴とする請求項１又は２に記
載の移動通信システムにおける無線チャネル輻輳制御方
式。4. The base station comprises a dedicated antenna for transmitting the broadcast channel, and horizontal directivity control means (51) for varying the horizontal directivity angle of the dedicated antenna. Property control means (51) to reduce the wireless zone by reducing the horizontal directivity angle of the dedicated antenna, and by expanding the horizontal directionality angle of the dedicated antenna The radio channel congestion control method in a mobile communication system according to claim 1 or 2, wherein the zone is restored.
信電界測定手段(70)と、 該報知チャネル受信電界測定手段(70)により測定された
最も強い電界の報知チャネルを送信する基地局からの無
線チャネルに切り替えを行う通信中チャネル切替制御手
段(75)とを具備したことを特徴とする請求項１〜４の何
れかに記載の移動通信システムにおける無線チャネル輻
輳制御方式。5. The broadcast channel received electric field measuring means (70) for measuring the received electric field of the broadcast channel in the mobile unit, and the broadcast channel of the strongest electric field measured by the broadcast channel received electric field measuring means (70). 5. A radio channel congestion control in a mobile communication system according to any one of claims 1 to 4, further comprising: communication channel switching control means (75) for switching to a radio channel from a base station transmitting method.
の同期を確立する無線同期確立手段(48)を設けると共
に、該記移動機に該基地局との無線通信の同期を確立す
る無線同期確立手段(76)を設け、 前記通信中チャネル切替制御手段(75)により他の基地局
からの無線チャネルに切り替えて通話を行う場合に、該
無線同期確立手段(48,76) で同期を取るようにしたこと
を特徴とする請求項５記載の移動通信システムにおける
無線チャネル輻輳制御方式。6. The base station is provided with a wireless synchronization establishing means (48) for establishing synchronization of wireless communication with the mobile device, and the mobile device establishes synchronization of wireless communication with the base station. A wireless synchronization establishment means (76) is provided, and when the communication is performed by switching to a wireless channel from another base station by the communication channel switching control means (75), the wireless synchronization establishment means (48,76) synchronizes. The radio channel congestion control method in the mobile communication system according to claim 5, wherein
記報知チャネルの受信電界強度を通話中の基地局へ報告
する無線状態報告信号生成手段(74)と、 前記報知チャネル受信電界測定手段(70)で測定された前
記報知チャネルの受信電界強度を一定間隔で該無線状態
報告信号生成手段(74)へ報告する無線状態報告タイマ手
段(73)とを具備したことを特徴とする請求項５記載の移
動通信システムにおける無線チャネル輻輳制御方式。7. A radio condition report signal generation means (74) for reporting to the base station in a call the received electric field strength of the broadcast channel measured by the broadcast channel reception electric field measurement means (70) to the mobile unit. A radio status report timer means (73) for reporting the received electric field strength of the broadcast channel measured by the broadcast channel reception electric field measurement means (70) to the radio status report signal generation means (74) at regular intervals. The radio channel congestion control method in the mobile communication system according to claim 5, wherein
線状態の測定要求を行う無線状態測定要求生成手段(44)
を設け、 該移動機に、 該測定要求を検出する無線状態要求信号検出手段(71)を
設け、 該無線状態要求信号検出手段(71)で該測定要求が検出さ
れた場合に、前記報知チャネル受信電界測定手段(70)で
測定された前記報知チャネルの受信電界強度が前記無線
状態報告信号生成手段(74)を介して、該測定要求を行っ
た基地局へ送信されるようにしたことを特徴とする請求
項１〜７の何れかに記載の移動通信システムにおける無
線チャネル輻輳制御方式。8. A radio condition measurement request generation means (44) for making a radio condition measurement request to the base station to the mobile device in communication with the base station and a base station in the vicinity.
The mobile station is provided with a radio condition request signal detecting means (71) for detecting the measurement request, and the broadcast channel is provided when the measurement request is detected by the radio condition request signal detecting means (71). The reception electric field strength of the broadcast channel measured by the reception electric field measurement means (70) is transmitted to the base station which has made the measurement request, via the radio condition report signal generation means (74). A radio channel congestion control method in the mobile communication system according to any one of claims 1 to 7.
記報知チャネルの受信電界が所定強度以上となったこと
を判別するためのしきい値が記憶されたしきい値記憶手
段(72)を設け、 前記基地局に、 前記無線状態報告信号生成手段(74)から送られてきた移
動機が受信している報知チャネルの受信電界強度を分析
し、無線チャネルを他の基地局からのものに切り替える
かどうかを決定する無線状態報告分析手段(47)と、 該無線状態報告分析手段(47)により無線チャネルの切り
替えが決定された場合に、切替先基地局に無線チャネル
切り替え要求を通知し、この通知を受けた切替先基地局
にあっては使用可能な無線チャネルが存在する際に切り
替え対象となる移動機の前記通信中チャネル切替制御手
段(75)に対して、切替先の無線ゾーン及び無線チャネル
番号を通知すると共に、先の切替元基地局にあっては無
線チャネルを空き状態とする制御を行う通信中チャネル
切替制御手段(43)とを設けたことをことを特徴とする請
求項６又は８記載の移動通信システムにおける無線チャ
ネル輻輳制御方式。9. The mobile device stores a threshold value for determining that the received electric field of the broadcast channel measured by the broadcast channel received electric field measuring means (70) has exceeded a predetermined strength. Threshold storage means (72) is provided, the base station, to analyze the received electric field strength of the broadcast channel being received by the mobile unit sent from the radio status report signal generation means (74), the radio channel Wireless state report analyzing means (47) for deciding whether or not to switch from the other base station, and the switching destination base station when the wireless state report analyzing means (47) decides to switch the wireless channel. To the communication channel switching control means (75) of the mobile device to be switched when there is a usable wireless channel in the switching destination base station that has received this notification. In contrast, switch And a communication channel switching control means (43) for notifying the wireless zone and the wireless channel number of the above and for controlling the wireless channel in the previous switching source base station to be in an idle state. The radio channel congestion control method in the mobile communication system according to claim 6 or 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4219963A JPH0669860A (en) | 1992-08-19 | 1992-08-19 | Radio channel congestion control system for mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4219963A JPH0669860A (en) | 1992-08-19 | 1992-08-19 | Radio channel congestion control system for mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0669860A true JPH0669860A (en) | 1994-03-11 |
Family
ID=16743783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4219963A Pending JPH0669860A (en) | 1992-08-19 | 1992-08-19 | Radio channel congestion control system for mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0669860A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025261A1 (en) * | 2003-08-29 | 2005-03-17 | Fujitsu Limited | Dynamic traffic control method and controller |
| JP2007522710A (en) * | 2004-01-08 | 2007-08-09 | インターデイジタル テクノロジー コーポレーション | Radio resource management in wireless local area networks |
| JP2008048107A (en) * | 2006-08-14 | 2008-02-28 | Ntt Docomo Inc | Base station apparatus and antenna pattern control method |
| US7864727B2 (en) | 2006-06-16 | 2011-01-04 | Hitachi, Ltd. | Congestion control method for wireless communication system and base station control apparatus |
-
1992
- 1992-08-19 JP JP4219963A patent/JPH0669860A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005025261A1 (en) * | 2003-08-29 | 2005-03-17 | Fujitsu Limited | Dynamic traffic control method and controller |
| US7756522B2 (en) | 2003-08-29 | 2010-07-13 | Fujitsu Limited | Dynamic traffic control method and device for the same |
| JP2007522710A (en) * | 2004-01-08 | 2007-08-09 | インターデイジタル テクノロジー コーポレーション | Radio resource management in wireless local area networks |
| US7949342B2 (en) | 2004-01-08 | 2011-05-24 | Interdigital Technology Corporation | Radio resource management in wireless local area networks |
| US7864727B2 (en) | 2006-06-16 | 2011-01-04 | Hitachi, Ltd. | Congestion control method for wireless communication system and base station control apparatus |
| JP2008048107A (en) * | 2006-08-14 | 2008-02-28 | Ntt Docomo Inc | Base station apparatus and antenna pattern control method |
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