JPH11252613A - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JPH11252613A JPH11252613A JP10053551A JP5355198A JPH11252613A JP H11252613 A JPH11252613 A JP H11252613A JP 10053551 A JP10053551 A JP 10053551A JP 5355198 A JP5355198 A JP 5355198A JP H11252613 A JPH11252613 A JP H11252613A
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- value
- base station
- mobile station
- predetermined
- electric field
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Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信システ
ムに関し、特に、マイクロセルとマクロセルが共存する
階層型セル構造の移動体通信システムに関する。The present invention relates to a mobile communication system, and more particularly to a mobile communication system having a hierarchical cell structure in which micro cells and macro cells coexist.
【０００２】[0002]
【従来の技術】携帯電話システム等の移動体通信システ
ムでは、サービスエリア内を複数のセルに分割し、各セ
ルに、各セルをカバーする無線ゾーンを持つ無線基地局
を配置して、携帯電話等の移動局が現在位置するセルを
カバーする無線基地局との間に無線回線を設定すること
により、サービスエリア内に位置する移動局に、無線通
信サービスを提供している。2. Description of the Related Art In a mobile communication system such as a mobile phone system, a service area is divided into a plurality of cells, and a radio base station having a radio zone covering each cell is arranged in each cell. The wireless communication service is provided to mobile stations located in the service area by setting up a wireless channel between the mobile station and the wireless base station covering the cell in which the mobile station is located.
【０００３】この種の移動体通信システムでは、移動局
が、あるセルから別のセルに移動した場合には、移動元
セルをカバーする無線基地局との間の無線回線を切断
し、移動先セルをカバーする無線基地局との間の無線回
線を設定しなければならない。即ち、移動局がセル間移
動を行った場合には、チャネル切替（ハンドオーバー）
を行わなければならない。In this type of mobile communication system, when a mobile station moves from a certain cell to another cell, the mobile station disconnects a radio line with a radio base station covering a source cell and moves to a destination cell. A radio line must be set up with the radio base station covering the cell. That is, when the mobile station moves between cells, channel switching (handover) is performed.
Must be done.
【０００４】ところで、移動局の移動速度が高い場合
は、移動速度が低い場合に比べて、隣接するセルへ移動
する回数が増え、ハンドオーバーの頻度が高くなる。即
ち、システムの処理負荷が増加するとともに、通信の瞬
断や切替先のチャネル不足による回線切断等の問題が生
じる。このような問題を防止するためには、セルは大き
いほうがよい。[0004] By the way, when the moving speed of the mobile station is high, the number of times of movement to an adjacent cell increases, and the frequency of handover increases, as compared with the case where the moving speed is low. That is, the processing load of the system increases, and problems such as a momentary interruption of communication and a line disconnection due to a shortage of the switching destination channel occur. To prevent such a problem, the larger the cell, the better.
【０００５】一方、限られた周波数資源を効率よく使用
し、より多くの利用者にサービスを提供するためには、
セルを小さくして周波数の繰り返し利用数を大きくする
ほうがよい。On the other hand, in order to efficiently use limited frequency resources and provide services to more users,
It is better to reduce the cell size and increase the number of repeated frequency uses.
【０００６】従来、このような相反する要求を満たすた
めに、サービスエリアをマイクロセルと呼ばれる比較的
小さいなセルで分割するとともに、それよりも大きなマ
クロセルと呼ばれるセルでも分割し（大きさの異なるセ
ルを重畳し）、移動速度が低い移動局はマイクロセルの
無線基地局に、移動速度が高い移動局はマクロセルの無
線基地局に回線接続する、階層型セル構造の移動体通信
システムがある。Conventionally, in order to satisfy such conflicting demands, a service area is divided into relatively small cells called micro cells, and a larger cell called a macro cell is divided (cells having different sizes). There is a mobile communication system having a hierarchical cell structure in which a mobile station having a low moving speed is connected to a radio base station of a micro cell and a mobile station having a high moving speed is connected to a radio base station of a macro cell.
【０００７】詳述すると、この種のシステムでは、サー
ビスエリアが図３に示しようにセル分割されている。即
ち、このシステムでは、サービスエリアが、比較的大き
なマクロセル３０１で分割されるとともに、比較的小さ
なマイクロセル３０２でも分割されている。そして、各
マクロセル３０１には、それぞれマクロセル用の無線基
地局（図示せず）が配設され、各マイクロセル３０２に
は、それぞれマイクロセル用の無線基地局（図示せず）
が配設されている。More specifically, in this type of system, the service area is divided into cells as shown in FIG. That is, in this system, the service area is divided by a relatively large macro cell 301 and also divided by a relatively small micro cell 302. Each macro cell 301 is provided with a radio base station (not shown) for the macro cell, and each micro cell 302 is provided with a radio base station (not shown) for the micro cell.
Are arranged.
【０００８】全ての無線基地局は、交換局に接続されて
いる基地局制御装置３０３に接続されている。基地局制
御装置３０３は、以下のようにして、サービスエリア内
に位置する移動局３０４といずれかの無線基地局との間
に通信回線（通話チャネル）を設定する。[0008] All radio base stations are connected to a base station controller 303 connected to the exchange. The base station control device 303 sets a communication line (communication channel) between the mobile station 304 located in the service area and any of the wireless base stations as described below.
【０００９】即ち、サービスエリア内に位置する移動局
３０４は、発呼時、着呼時及びハンドオーバー時に、自
身の平均移動速度を検出する。そして、発呼時及び着呼
時には制御チャネルを通じて、ハンドオーバー時には通
話中の通話チャネルを通じて、検出した移動速度を基地
局制御装置３０３ヘ通知する。That is, the mobile station 304 located in the service area detects its own average moving speed at the time of calling, receiving, and handover. Then, the base station control device 303 is notified of the detected moving speed through a control channel at the time of calling and receiving, and through a communication channel during a call at the time of handover.
【００１０】基地局制御装置３０３は、発呼時及び着呼
時には、移動局に対して最も受信電界が強いマイクロセ
ル用無線基地局、又はそのマイクロセル用無線基地局を
含むマクロセルの無線基地局のいずれか一方と移動局３
０４との間に通話回線を設定する。このとき、移動局３
０４の平均移動速度を参照して移動速度が所定値以上で
あればマクロセル用無線基地局を、所定値未満であれ
ば、マイクロセル用無線基地局を選択する。At the time of calling and receiving a call, the base station control device 303 transmits a radio base station for a micro cell having the strongest reception electric field to the mobile station or a radio base station for a macro cell including the micro base radio base station. Mobile station 3
A call line is set up between the communication line 04. At this time, mobile station 3
If the moving speed is equal to or higher than a predetermined value with reference to the average moving speed of 04, the radio base station for the macro cell is selected.
【００１１】また、ハンドオーバー時には、基地局制御
装置３０３は、移動局３０４の平均移動速度に応じて切
替先の無線基地局がマイクロセル用か、マクロセル用か
判断する。そして、その判断結果に基づいて、切替先と
なり得る複数のマイクロセル用無線基地局又は切替先と
なり得る複数のマクロセル用無線基地局に対して、ハン
ドオーバーの対象となる移動局３０４の受信電界の監視
を命じる。その後、各無線基地局の監視結果に基づいて
ハンドオーバー処理を行う。Also, at the time of handover, the base station control device 303 determines whether the radio base station to be switched is for a micro cell or a macro cell according to the average moving speed of the mobile station 304. Then, based on the determination result, the reception electric field of the mobile station 304 to be handed over is determined for a plurality of micro cell radio base stations that can be a switching destination or a plurality of macro cell radio base stations that can be a switching destination. Order surveillance. After that, a handover process is performed based on the monitoring result of each wireless base station.
【００１２】以上のように、従来の階層型セル構造の移
動体通信システムでは、移動体の移動速度に応じてマイ
クロセル用無線基地局またはマクロセル用無線基地局が
選択され、移動局との間に通信回線が設定されるように
なっている。As described above, in a conventional mobile communication system having a hierarchical cell structure, a microcell radio base station or a macrocell radio base station is selected according to the moving speed of a mobile object, and the mobile station is connected to the mobile station. A communication line is set for the service.
【００１３】なお、このような移動体通信システムは、
特開平２−２４４９１７号公報に記載されている。[0013] Such a mobile communication system includes:
It is described in JP-A-2-244917.
【００１４】[0014]
【発明が解決しようとする課題】従来の階層型セル構造
の移動体通信システムでは、移動局が自身の移動速度を
検出して、基地局制御装置に通知するように構成されて
いる。このため、このような階層型セル構造を採用する
以前に普及した移動局に対しては、速度検出装置を取り
付ける等の改造なくして、このサービスを提供すること
ができないという問題点がある。In a conventional mobile communication system having a hierarchical cell structure, a mobile station is configured to detect its own moving speed and notify the base station controller. For this reason, there is a problem in that this service cannot be provided to mobile stations that have become widespread before adopting such a hierarchical cell structure without modification such as attachment of a speed detecting device.
【００１５】また、従来の階層型セル構造の移動体通信
システムでは、一旦設定された通信回線は、移動局が隣
接するセルに移動した場合にのみチャネル切替されるた
め、隣接セルへの移動がなければ、一旦設定された通信
回線が維持され、移動局の移動速度に応じた適切な無線
基地局への接続が実現されないという問題点もある。Further, in the conventional mobile communication system having a hierarchical cell structure, a communication line once set is switched only when a mobile station moves to an adjacent cell. If not, there is also a problem that the communication line once set is maintained, and connection to an appropriate wireless base station according to the moving speed of the mobile station cannot be realized.
【００１６】本発明は、既存の利用者に対しても、移動
局の移動速度に対応する無線基地局が選択される階層型
セル構造の移動体通信システムを提供することを目的と
する。An object of the present invention is to provide a mobile communication system having a hierarchical cell structure in which a radio base station corresponding to the moving speed of a mobile station is selected even for existing users.
【００１７】また、本発明は、常に移動局の移動速度に
応じた適切な無線基地局が選択される階層型セル構造の
移動体通信システムを提供することを目的とする。It is another object of the present invention to provide a mobile communication system having a hierarchical cell structure in which an appropriate radio base station is always selected according to the moving speed of a mobile station.
【００１８】[0018]
【課題を解決するための手段】本発明によれば、マクロ
セルとマイクロセルとが共存する階層型セル構造を採用
し、前記マクロセルと前記マイクロセルのそれぞれに配
置された無線基地局と、該無線基地局に接続される基地
局制御装置とを有する移動体通信システムにおいて、前
記無線基地局の各々が、交信中の移動局から受信した信
号の電界強度を検出する受信電界強度検出手段と、該受
信電界強度検出手段からの前記電界強度に基づいて前記
移動局の移動速度を判定するための速度情報を生成して
前記基地局制御装置へ通知する速度情報生成手段とを有
し、前記基地局制御装置が、前記速度情報に基づいて、
前記移動局の移動速度を高速または低速と判定する判定
手段と、該判定手段の判定結果に基づいてハンドオーバ
ーを行うチャネル切替制御手段とを有することを特徴と
する移動体通信システムが得られる。According to the present invention, there is provided a hierarchical cell structure in which a macro cell and a micro cell coexist, and a radio base station disposed in each of the macro cell and the micro cell; In a mobile communication system having a base station control device connected to a base station, each of the radio base stations detects reception field strength detection means for detecting a field strength of a signal received from a communicating mobile station; Speed information generating means for generating speed information for determining the moving speed of the mobile station based on the electric field strength from the received electric field strength detecting means and informing the base station controller of the speed information, The control device, based on the speed information,
A mobile communication system is provided, comprising: determining means for determining whether the moving speed of the mobile station is high or low; and channel switching control means for performing handover based on the determination result of the determining means.
【００１９】また、前記無線基地局の各々が、前記電界
強度が所定強度未満になったことを検出して前記基地局
制御装置に通知する回線品質劣化通知手段を有し、前記
チャネル切替制御手段が、前記回線品質劣化通知手段か
らの通知を受けたときにも、前記判定手段の判定結果に
基づいてハンドオーバーを行うようにしたことを特徴と
する移動体通信システムが得られる。In addition, each of the radio base stations has a line quality deterioration notifying means for detecting that the electric field strength has become less than a predetermined strength and notifying the base station control device, and the channel switching control means. However, even when a notification is received from the line quality deterioration notifying unit, a handover is performed based on the determination result of the determining unit.
【００２０】具体的には、前記速度情報生成手段が、所
定の周期毎に前記電界強度の中央値を求め、求めた中央
値と１周期前の中央値との差分を求めて、前記速度情報
として前記基地局制御装置へ送信し、前記判定手段が、
ｐ個（ｐは、自然数）の連続する差分のうちｑ個（ｑ
は、自然数；ｑ≦ｐ）以上が所定の閾値を超えた場合に
前記移動局の移動速度を高速と判断する。Specifically, the speed information generating means obtains a median value of the electric field strength at predetermined intervals, obtains a difference between the obtained median value and the median value one cycle before, and obtains the speed information. As the transmission to the base station control device, the determination means,
Of p (p is a natural number) continuous differences, q (q
Is a natural number; when q ≦ p) or more exceeds a predetermined threshold, the moving speed of the mobile station is determined to be high.
【００２１】または、前記速度情報生成手段が、所定周
期毎に、前記電界強度が予め定められた第１の閾値を下
回る回数を計数し、その計数値を前記速度情報として前
記基地局制御装置へ送信し、前記判定手段が、前記計数
値と予め定められた第２の閾値とを比較し、前記計数値
が前記第２の閾値を超えた場合に前記移動局の移動速度
を高速と判断する。Alternatively, the speed information generating means counts the number of times that the electric field intensity falls below a predetermined first threshold at predetermined intervals, and uses the counted value as the speed information to the base station controller. Transmitting, the determination unit compares the count value with a predetermined second threshold value, and determines that the moving speed of the mobile station is high when the count value exceeds the second threshold value .
【００２２】また、前記速度情報生成手段が、第１の所
定の周期毎に前記電界強度の第１の中央値を求め、当該
第１の中央値を前記速度情報として前記基地局制御装置
へ送信し、前記判定手段が、前記第１の所定周期のｎ倍
（ｎは、２以上の整数）の第２の周期毎にｎ個の前記第
１の中央値の中央値を求めて第２の中央値とし、１周期
前の第２の中央値との差分を求め、ｐ個（ｐは、自然
数）の連続する差分のうちｑ個（ｑは、自然数；ｑ≦
ｐ）以上が所定の閾値を超えた場合に前記移動局の移動
速度を高速と判断するようにしてもよい。Further, the speed information generating means obtains a first median value of the electric field strength at every first predetermined period, and transmits the first median value as the speed information to the base station controller. The determining means obtains a median of n first medians at every second cycle of n times (n is an integer of 2 or more) of the first predetermined cycle to obtain a second median value. The median value is set, and the difference from the second median value one cycle before is obtained, and q (q is a natural number; q ≦) out of p (p is a natural number) continuous differences
p) The moving speed of the mobile station may be determined to be high when the above exceeds a predetermined threshold.
【００２３】あるいは、前記速度情報生成手段が、前記
移動局から受信した信号を構成するフレームの長さのｍ
倍（ｍは、２以上の整数）に等しい所定周期毎に前記電
界強度の中央値を求め、当該中央値より所定値だけ低い
値を第１の閾値として、前記所定周期毎に、前記電界強
度が前記第１の閾値を下回ることがあったフレームをい
くつ含むか計数して、その計数値を前記速度情報として
前記基地局制御装置へ送信し、前記判定手段が、前記計
数値と予め定められた第２の閾値とを比較し、前記計数
値が前記第２の閾値を超えた場合に前記移動局の移動速
度を高速と判断するようにしてもよい。Alternatively, the speed information generating means may calculate the length m of a frame constituting a signal received from the mobile station.
A median value of the electric field strength is obtained at predetermined intervals equal to a multiple (m is an integer of 2 or more), and a value lower than the median value by a predetermined value is set as a first threshold value. The number of frames that may have fallen below the first threshold is counted, and the counted value is transmitted to the base station control device as the speed information, and the determination means is determined in advance as the counted value. The moving speed of the mobile station may be determined to be high when the count value exceeds the second threshold value.
【００２４】[0024]
【作用】本発明の移動体通信システムでは、無線基地局
側で移動局の速度を検出する。即ち、無線基地局は、交
信中の移動局から送信される信号の電界強度を監視す
る。そして、無線基地局は、電界強度に基づいて２種類
の速度情報を生成し、基地局制御装置へ通知する。ま
た、電界強度の低下に基づいて通信回線の品質劣化を基
地局制御装置へ通知する。In the mobile communication system according to the present invention, the speed of the mobile station is detected by the radio base station. That is, the radio base station monitors the electric field strength of the signal transmitted from the mobile station in communication. Then, the radio base station generates two types of speed information based on the electric field strength, and notifies the base station controller of the generated speed information. Further, the base station controller notifies the base station controller of the quality deterioration of the communication line based on the decrease in the electric field strength.
【００２５】基地局制御装置は、２種類の速度情報のそ
れぞれに基づいて、移動局の移動速度を判定する。そし
て、２つの判定結果のうち、いずれか一方または両方
が、移動局が高速移動していると判断した場合に、マク
ロセルへのハンドオーバーを行い、それ以外の場合は、
マイクロセルへのハンドオーバーを行う。また、通信回
線の品質劣化の通知を受けた場合にも、緯度局の移動速
度の判定を行い、その判定結果に基づいてハンドオーバ
ーを行う。The base station controller determines the moving speed of the mobile station based on each of the two types of speed information. When one or both of the two determination results determine that the mobile station is moving at a high speed, the mobile station performs handover to the macro cell, otherwise,
Perform handover to the microcell. Also, when the notification of the quality deterioration of the communication line is received, the moving speed of the latitude station is determined, and the handover is performed based on the determination result.
【００２６】[0026]
【発明の実施の形態】以下図面を参照して本発明の実施
の形態に付いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２７】図１に本発明の第１の実施の形態を示す。
この移動体通信システムでは、階層型セル構造を採用し
ており、そのサービスエリアは、マイクロセル及びマク
ロセルによって分割されている。図１では、説明を簡略
化するため、２つのマイクロセル１０及び２０と、これ
らのマイクロセルをセル内に含むマクロセル３０とを示
している。FIG. 1 shows a first embodiment of the present invention.
This mobile communication system employs a hierarchical cell structure, and its service area is divided by micro cells and macro cells. FIG. 1 shows two microcells 10 and 20 and a macrocell 30 including these microcells in the cell, for the sake of simplicity.
【００２８】各セルには、それぞれのセルをカバーする
無線基地局が設置される。即ち、マイクロセル１０及び
２０には、それぞれ、マイクロセル基地局１１、２１
が、マクロセル３０には、マクロセル基地局３１が配置
されている。Each cell is provided with a radio base station covering each cell. That is, the microcells 10 and 20 have the microcell base stations 11 and 21 respectively.
However, a macro cell base station 31 is arranged in the macro cell 30.
【００２９】マイクロセル基地局１１，２１及びマクロ
セル基地局３１は、それぞれ、各セルを指向するアンテ
ナ１２，２２及び３２と、各アンテナ１２，２２及び３
２に接続された受信部１３，２３及び３３と送信部１
４，２４及び３４と、受信部及び送信部を制御する制御
部１５，２５及び３５とを有している。また、全ての制
御部１５，２５及び３５は、交換局に接続される基地局
制御装置４０に接続されている。The micro-cell base stations 11 and 21 and the macro-cell base station 31 respectively include antennas 12, 22 and 32 pointing to respective cells and antennas 12, 22 and 3
2, receiving units 13, 23 and 33 and transmitting unit 1
4, 24 and 34, and control units 15, 25 and 35 for controlling the receiving unit and the transmitting unit. All the control units 15, 25 and 35 are connected to a base station control device 40 connected to the exchange.
【００３０】次に、この移動体通信システムの動作に付
いて説明する。ここでは、移動局５０が、現在、マイク
ロセル１０内に存在しており、マイクロセル２０に向か
って移動しているとする。Next, the operation of the mobile communication system will be described. Here, it is assumed that the mobile station 50 is present in the microcell 10 and is moving toward the microcell 20.
【００３１】まず、移動局５０からの発呼、あるいは移
動局への着呼が発生した場合について説明する。この場
合、各無線基地局の受信部は、移動局５０から送信され
た発呼信号、または着呼呼出信号に対する応答信号を受
信した際に、その受信電界強度を検出する。各無線基地
局の制御部は、受信部が検出した受信電界強度を基地局
制御装置４０に報告する。First, a case where a call from the mobile station 50 or a call to the mobile station occurs will be described. In this case, when the receiving unit of each radio base station receives the call signal transmitted from the mobile station 50 or the response signal to the incoming call signal, it detects the received electric field strength. The control unit of each wireless base station reports the received electric field strength detected by the receiving unit to the base station control device 40.
【００３２】基地局制御装置４０は、各無線基地局から
の受信電界強度を参照して、最も受信電界強度の大きい
無線基地局と選択し、選択した無線基地局と移動局５０
との間に通話回線を設定する。通常、基地局制御装置４
０が選択する無線基地局は、現在移動局５０が存在する
マイクロセルの無線基地局、図１の場合、マイクロセル
基地局１１となる。The base station controller 40 refers to the received electric field strength from each radio base station, selects the radio base station having the largest received electric field strength, and selects the selected radio base station and mobile station 50.
Set up a telephone line between and. Normally, the base station controller 4
The radio base station selected by 0 is the radio base station of the microcell in which the mobile station 50 currently exists, and in FIG. 1, the microcell base station 11.
【００３３】次に、上記のようにして、通話回線が設定
された移動局５０の移動に伴うハンドオーバーに付いて
説明する。Next, a description will be given of a handover accompanying the movement of the mobile station 50 to which the communication line is set as described above.
【００３４】移動局５０との間に通話回線が設定された
マイクロセル基地局１１の受信部１３は、常に、移動局
５０からの送信信号を受信するとその受信電界強度を計
測する。そして、受信部１３は、計測した受信電界強度
を電界情報として制御部１５へ通知する。When receiving a transmission signal from the mobile station 50, the receiving unit 13 of the microcell base station 11 with the communication line set up with the mobile station 50 always measures the received electric field strength. Then, the receiving unit 13 notifies the control unit 15 of the measured received electric field strength as electric field information.
【００３５】制御部１５は、受信部１３から受け取った
電界情報に基づいて通信回線の品質劣化が生じているか
否か判定し、通信回線の劣化が生じている場合には、通
信回線品質劣化を基地局制御装置４０に通知する。通信
回線品質が劣化したと判定されるのは、例えば、所定期
間にわたり、受信電界強度が所定の閾値を下回った場合
である。The control unit 15 determines whether or not the communication line quality has deteriorated based on the electric field information received from the receiving unit 13. If the communication line has deteriorated, the control unit 15 determines the communication line quality deterioration. Notify the base station controller 40. The communication line quality is determined to be degraded, for example, when the received electric field strength falls below a predetermined threshold for a predetermined period.
【００３６】また、制御部１５は、受信部１３からの電
界情報に基づき、予め設定された第１の周期毎に、その
電界強度の中央値（ＲＳＳＩ）を求め、求めた中央値を
第１の速度情報として基地局制御装置４０へ報告する。Further, the control unit 15 calculates the median value (RSSI) of the electric field strength at every preset first cycle based on the electric field information from the receiving unit 13 and calculates the obtained median value as the first median value. To the base station controller 40 as speed information of the base station.
【００３７】更に、制御部１５は、予め設定された第２
の周期（複数フレームに相当）毎にその中央値を求め、
各周期において、中央値よりも所定値だけ低い値を第１
の閾値として求め、その閾値を電界強度が下回る回数を
フレーム単位で求める。即ち、各フレームに付いて、１
度でも第１の閾値を下回った場合は、“１”、１度も閾
値が下回らなかった場合は“０”と数える。そして、第
２の周期ごとの合計（ＬＣＲ）を、第２の速度情報とし
て基地局制御装置４０へ報告する。Further, the control unit 15 controls a predetermined second
For each period (equivalent to multiple frames)
In each cycle, a value lower than the median by a predetermined value
, And the number of times the electric field strength falls below the threshold is determined in frame units. That is, for each frame, 1
If the degree does not fall below the first threshold value, it is counted as “1”, and if the degree has never fallen below the threshold value, it is counted as “0”. Then, the total (LCR) for each second cycle is reported to the base station controller 40 as second speed information.
【００３８】基地局制御装置４０は、マイクロセル基地
局１１からの第１及び第２の速度情報に基づいて、移動
局の移動速度を判定する。The base station controller 40 determines the moving speed of the mobile station based on the first and second speed information from the microcell base station 11.
【００３９】詳述すると、基地局制御装置４０は、第１
の周期のｎ倍（ｎは、２以上の整数）に等しい第３の周
期毎に、第１の速度情報の中央値（ＲＳＳＩ２）を求め
る。そして、第３の周期毎に、求めた中央値（ＲＳＳＩ
２）と、１周期前の中央値との差分を求める。そして、
求めた差分を、予め定めた第２の閾値と比較する。連続
するｐ（ｐは、自然数）周期分の中央値（ＲＳＳＩ２）
のうち、ｑ（ｐ≧ｑ、ｑ：自然数）周期分以上の中央値
が第２の閾値を超えた場合、基地局制御装置４０は、移
動局５０が高速で移動していると判断し、それ以外の場
合は、低速で移動中または停止していると判断する。More specifically, the base station control device 40
The median value (RSSI2) of the first speed information is obtained for each third period equal to n times (n is an integer of 2 or more) of the period of. Then, for each third cycle, the calculated median (RSSI
Find the difference between 2) and the median one cycle before. And
The obtained difference is compared with a predetermined second threshold value. Median value of continuous p (p is a natural number) cycles (RSSI2)
When the median value equal to or more than q (p ≧ q, q: natural number) cycles exceeds the second threshold, the base station controller 40 determines that the mobile station 50 is moving at high speed, In other cases, it is determined that the vehicle is moving or stopped at a low speed.
【００４０】また、基地局制御装置４０は、第２の速度
情報が示す合計回数と予め設定された第３の閾値とを比
較し、合計回数が第３の閾値を超えた場合に、移動局５
０が高速で移動していると判断し、それ以外の場合は、
低速で移動中または停止していると判断する。Further, the base station controller 40 compares the total number of times indicated by the second speed information with a preset third threshold value, and when the total number exceeds the third threshold value, 5
0 is determined to be moving at high speed, otherwise,
Judge that it is moving or stopped at low speed.
【００４１】基地局制御装置４０は、第１の速度情報に
基づいて、移動局５０が高速移動中であると判断した場
合、又は、第２の速度情報基づいて、移動局５０が高速
移動中であると判断した場合にマクロセル基地局３１へ
のハンドオーバーを実行する。即ち、マイクロセル基地
局１１及びマクロセル３１に対してチャネル切替の指示
を出す。指示を受けたマイクロセル基地局１１及びマク
ロセル３１では、それぞれ制御部１５，３５から送信部
１４，３４へチャネル切替の指示がなされ、送信部１４
は、移動局５０に対して切替先のチャネルを通知し、送
信部３４は、移動局５０との間に通信回線を設定する。The base station controller 40 determines that the mobile station 50 is moving at high speed based on the first speed information, or that the mobile station 50 is moving at high speed based on the second speed information. If it is determined that the handover is performed, the handover to the macro cell base station 31 is executed. That is, it issues a channel switching instruction to the microcell base station 11 and the macrocell 31. In the microcell base station 11 and the macrocell 31 that have received the instructions, the control units 15 and 35 respectively instruct the transmission units 14 and 34 to perform channel switching.
Notifies the mobile station 50 of the switching destination channel, and the transmitting unit 34 sets up a communication line with the mobile station 50.
【００４２】基地局制御装置４０は、あるいは、第１の
速度情報に基づいて移動局５０が高速移動中であると判
断し、かつ第２の速度情報基づいて移動局５０が高速移
動中であると判断した場合にのみマクロセル基地局３１
へハンドオーバーするようにしてもよい。Alternatively, the base station controller 40 determines that the mobile station 50 is moving at high speed based on the first speed information, and the mobile station 50 is moving at high speed based on the second speed information. Only when it is determined that the macro cell base station 31
Handover may be performed.
【００４３】以上の動作を行いながら、基地局制御装置
４０は、マイクロセル基地局１１から通信回線品質劣化
の通知を受けた場合にもハンドオーバー処理を行う。こ
の場合も、移動局５０の移動速度が高速であるのか否か
判定して、そのチャネル切替先を決定する。即ち、通信
回線品質が劣化した場合であって、移動局が高速移動し
ている場合には、マクロセル基地局３１へハンドオーバ
ーし、移動局が低速移動又は停止している場合は、マイ
クロセル基地局２１へハンドオーバーする。While performing the above operations, the base station controller 40 performs the handover process also when receiving the notification of the deterioration of the communication channel quality from the microcell base station 11. Also in this case, it is determined whether or not the moving speed of the mobile station 50 is high, and the channel switching destination is determined. That is, when the communication line quality is deteriorated and the mobile station is moving at high speed, handover to the macro cell base station 31 is performed. When the mobile station is moving at low speed or stopped, the micro cell base station is used. Handover to station 21.
【００４４】以上の処理をまとめると、図２（ａ）のよ
うになる。即ち、基地局制御装置４０は、移動局が高速
移動していることを検出すると、マクロセル基地局３１
へのハンドオーバーを行う。また、通信回線の品質劣化
を検出した場合には、移動局５０の速度に応じてマイク
ロセル基地局２１又はマクロセル基地局３１へハンドオ
ーバーする。FIG. 2A summarizes the above processing. That is, when the base station controller 40 detects that the mobile station is moving at high speed, the macro cell base station 31
Perform a handover to When the quality deterioration of the communication line is detected, the handover is performed to the microcell base station 21 or the macrocell base station 31 according to the speed of the mobile station 50.
【００４５】移動局５０が高速移動中で、マクロセル基
地局３１との間に通信回線が設定された場合も、上記の
場合と同様にしてハンドオーバーが行われる。即ち、マ
クロセル基地局３１の制御部３５は、上述した第１の速
度情報と第２の速度情報とを基地局制御装置４０へ送信
する。また、通信回線劣化を検出した場合には、そのこ
とを基地局制御装置４０へ通知する。When the mobile station 50 is moving at high speed and a communication line is set up with the macro cell base station 31, handover is performed in the same manner as in the above case. That is, the control unit 35 of the macrocell base station 31 transmits the above-described first speed information and second speed information to the base station control device 40. When the communication line deterioration is detected, the fact is notified to the base station controller 40.
【００４６】基地局制御装置４０は、上記と同様の動作
により、移動局の移動速度を判断し、移動速度が低速で
移動または停止していると判断した場合は、マイクロセ
ル基地局１１（又は２１、受信電界強度の強い方）にハ
ンドオーバーする。ただし、マクロセル基地局３１から
マイクロセル基地局１１（又は２１）へのハンドオーバ
ーは、移動先のマイクロセル基地局１１（又は２１）に
空きチャネルが存在する場合にのみ行われる。The base station controller 40 determines the moving speed of the mobile station by the same operation as described above, and if it determines that the moving speed is moving or stopping at a low speed, the microcell base station 11 (or 21, the handover to the stronger received electric field strength). However, handover from the macro cell base station 31 to the micro cell base station 11 (or 21) is performed only when there is an empty channel in the micro cell base station 11 (or 21) of the movement destination.
【００４７】また、回線品質の劣化が通知された場合
も、移動局５０の移動速度の判定が行われ、その結果に
応じてハンドオーバーが行われる。Also, when the deterioration of the channel quality is notified, the moving speed of the mobile station 50 is determined, and the handover is performed according to the result.
【００４８】以上の処理をまとめると、図２（ｂ）に示
すようになる。The above processing is summarized as shown in FIG.
【００４９】図２（ｂ）に示すように、基地局制御装置
４０は、移動局が低速で移動しているか停止しているこ
とを検出すると、移動先のマイクロセルを決定して、そ
のセルに空きチャネルが存在すれば、そのマイクロセル
基地局へのハンドオーバーを行う。空きチャネルが存在
しなければハンドオーバーは行わない。また、通信回線
の品質劣化を検出した場合には、移動局５０の移動速度
に応じて、マクロセル基地局またはマイクロセル基地局
へハンドオーバーを行う。As shown in FIG. 2B, when the base station controller 40 detects that the mobile station is moving at a low speed or has stopped, the base station controller 40 determines the microcell to which the mobile station has moved, and If there is an empty channel, handover to the microcell base station is performed. If there is no free channel, no handover is performed. When the quality deterioration of the communication line is detected, the handover to the macro cell base station or the micro cell base station is performed according to the moving speed of the mobile station 50.
【００５０】なお、移動局が低速移動または停止してい
ることを検出したとき（通信回線の品質劣化はないもの
とする）のみ移動先の空きチャネルの存在確認を行うよ
うにしたのは、不要な回線断を避けるためである。即
ち、品質劣化の場合は、現チャネルを維持し続けること
が困難で、移動先に空きチャンネルがなければ、いず
れ、回線断とせざるを得ないが、上記場合には、ハンド
オーバーが不可能でも、回線を維持することができるか
らである。It is not necessary to confirm the presence of a vacant channel at the destination only when it is detected that the mobile station is moving at a low speed or stopped (assuming that the quality of the communication line is not degraded). This is to avoid unnecessary line disconnection. That is, in the case of quality deterioration, it is difficult to maintain the current channel, and if there is no free channel at the destination, the line must be disconnected sometime, but in the above case, even if handover is impossible, This is because the line can be maintained.
【００５１】次に、本発明の第２の実施の形態について
説明する。本実施の形態による移動体通信システムは、
各無線基地局及び基地局制御装置の負荷を軽減するため
に、上述した第１の実施の形態のシステムを簡略化した
ものである。その構成は、第１の実施の形態と同じであ
るが、その動作が異なる。Next, a second embodiment of the present invention will be described. The mobile communication system according to the present embodiment includes:
In order to reduce the load on each radio base station and base station controller, the system of the first embodiment is simplified. Its configuration is the same as that of the first embodiment, but its operation is different.
【００５２】即ち、このシステムの各無線基地局の制御
部は、第１の所定の周期毎に、受信部から受け取った受
信電界強度の中央値を求め、１周期前の中央値との差分
を求め、第１の速度情報として基地局制御装置へ送信す
る。That is, the control unit of each radio base station of this system obtains the median value of the received electric field strength received from the receiving unit at every first predetermined cycle and calculates the difference from the median value one cycle before. Then, it is transmitted to the base station controller as first speed information.
【００５３】また、各無線基地局の制御部は、第２の所
定周期毎に、受信電界強度が第１の閾値を下回った回数
を計数し、その計数値を第２の速度情報として基地局制
御装置へ送信する。Further, the control unit of each radio base station counts the number of times that the received electric field strength has fallen below the first threshold value at every second predetermined period, and uses the counted value as the second speed information. Send to control device.
【００５４】基地局制御装置では、無線基地局からの第
１の速度情報を受けて、連続するｐ（ｐは、自然数）個
の差分のうちｑ個（ｑは、自然数；ｑ≦ｐ）以上が所定
の閾値を超えた場合に移動局の移動速度を高速と判断す
る。The base station controller receives the first speed information from the radio base station, and receives at least q (q is a natural number; q ≦ p) out of p consecutive (p is a natural number) differences Is larger than a predetermined threshold, it is determined that the moving speed of the mobile station is high.
【００５５】また、基地局制御装置は、無線基地局から
の第２の速度情報を受けて、第２の速度情報が示す計数
値と予め定められた第２の閾値とを比較し、計数値が第
２の閾値を超えた場合に移動局の移動速度を高速と判断
する。Further, the base station control device receives the second speed information from the radio base station, compares the count value indicated by the second speed information with a second predetermined threshold value, and counts the count value. Is determined to be high when the mobile station exceeds the second threshold.
【００５６】その他の動作については、第１の実施の形
態と同様なのでその説明を省略する。Other operations are the same as those in the first embodiment, and the description thereof is omitted.
【００５７】なお、第１の実施例及び第２の実施例にお
いて、検出周期や、閾値等の値は、セルの大きさなどに
よって任意に設定することができる。即ち、各セル毎に
検出レベルを設定することができる。In the first and second embodiments, the value of the detection period, the threshold value, and the like can be arbitrarily set according to the size of the cell. That is, the detection level can be set for each cell.
【００５８】[0058]
【発明の効果】本発明によれば、移動局の移動速度を、
無線基地局及び基地局制御装置において判断するように
したことで、既存の移動局に対しても、階層型セル構造
の移動体通信システムのサービスを提供することができ
る。According to the present invention, the moving speed of the mobile station is
By making the determination in the radio base station and the base station controller, it is possible to provide a mobile communication system service having a hierarchical cell structure to existing mobile stations.
【００５９】また、本発明によれば、常に、移動局の移
動速度を検出しているので、移動局の移動速度に応じて
適切な無線基地局を選択することができる。Further, according to the present invention, since the moving speed of the mobile station is always detected, it is possible to select an appropriate radio base station according to the moving speed of the mobile station.
【００６０】また、本発明によれば、一定周期で受信電
界の中央値を検出するとともに、受信電界の落ち込み回
数をカウントするようにしたことで、より精度の高い移
動局の移動速度判定を行うことができる。Further, according to the present invention, the median value of the received electric field is detected at a constant period, and the number of drops of the received electric field is counted, so that the moving speed of the mobile station can be determined with higher accuracy. be able to.
【００６１】さらに、通信回線の劣化が生じた場合にも
移動局の速度判定を行うようにしたことで、より適切な
無線基地局の選択ができる。Further, by judging the speed of the mobile station even when the communication line is deteriorated, a more appropriate radio base station can be selected.
【図１】本発明の一実施の形態を示すブロック図であ
る。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】図１の移動体通信システムの動作を説明するた
めのフローチャートである。FIG. 2 is a flowchart illustrating an operation of the mobile communication system of FIG. 1;
【図３】階層型セル構造の移動体通信システムを説明す
るための図である。FIG. 3 is a diagram for explaining a mobile communication system having a hierarchical cell structure.
１０，２０ マイクロセル １１，２１ マイクロセル基地局 １２，２２ アンテナ １３，２３ 受信部 １４，２４ 送信部 １５，２５ 制御部 ３０ マクロセル ３１ マクロセル基地局 ３２ アンテナ ３３ 受信部 ３４ 送信部 ３５ 制御部 ４０ 基地局制御装置 ５０ 移動局 ３０１ マクロセル ３０２ マイクロセル ３０３ 基地局制御装置 ３０４ 移動局 10, 20 microcell 11, 21 microcell base station 12, 22 antenna 13, 23 reception unit 14, 24 transmission unit 15, 25 control unit 30 macrocell 31 macrocell base station 32 antenna 33 reception unit 34 transmission unit 35 control unit 40 base Station control device 50 Mobile station 301 Macro cell 302 Micro cell 303 Base station control device 304 Mobile station
Claims (8)
階層型セル構造を採用し、前記マクロセルと前記マイク
ロセルのそれぞれに配置された無線基地局と、該無線基
地局に接続される基地局制御装置とを有する移動体通信
システムにおいて、前記無線基地局の各々が、交信中の
移動局から受信した信号の電界強度を検出する受信電界
強度検出手段と、該受信電界強度検出手段からの前記電
界強度に基づいて前記移動局の移動速度を判定するため
の速度情報を生成して前記基地局制御装置へ通知する速
度情報生成手段とを有し、前記基地局制御装置が、前記
速度情報に基づいて、前記移動局の移動速度を高速また
は低速と判定する判定手段と、該判定手段の判定結果に
基づいてハンドオーバーを行うチャネル切替制御手段と
を有することを特徴とする移動体通信システム。1. A radio base station which adopts a hierarchical cell structure in which a macro cell and a micro cell coexist, is disposed in each of the macro cell and the micro cell, and a base station control device connected to the radio base station In each of the mobile communication systems, each of the radio base stations detects electric field intensity of a signal received from a mobile station being communicated with, and the electric field intensity from the received electric field intensity detecting means. Speed information generating means for generating speed information for determining the moving speed of the mobile station based on the base station control device, and the base station control device, based on the speed information Determining means for determining whether the moving speed of the mobile station is high or low, and channel switching control means for performing handover based on the determination result of the determining means. Mobile communication system.
が所定強度未満になったことを検出して前記基地局制御
装置に通知する回線品質劣化通知手段を有し、前記チャ
ネル切替制御手段が、前記回線品質劣化通知手段からの
通知を受けたときにも、前記判定手段の判定結果に基づ
いてハンドオーバーを行うようにしたことを特徴とする
請求項１の移動体通信システム。2. The channel switching control unit, wherein each of the radio base stations includes a line quality deterioration notifying unit that detects that the electric field intensity has become less than a predetermined intensity and notifies the base station control unit of the detection. 2. The mobile communication system according to claim 1, wherein, when receiving a notification from said line quality deterioration notifying means, a handover is performed based on a result of determination by said determining means.
に前記電界強度の中央値を求め、求めた中央値と１周期
前の中央値との差分を求めて、前記速度情報として前記
基地局制御装置へ送信し、前記判定手段が、ｐ個（ｐ
は、自然数）の連続する差分のうちｑ個（ｑは、自然
数；ｑ≦ｐ）以上が所定の閾値を超えた場合に前記移動
局の移動速度を高速と判断することを特徴とする請求項
１又は２の移動体通信システム。3. The speed information generating means obtains a median value of the electric field strength at predetermined intervals, obtains a difference between the obtained median value and a median value one cycle before, and obtains the base information as the speed information. Transmitted to the station control device, and the determination means determines p (p
The moving speed of the mobile station is determined to be high when q (q is a natural number; q ≦ p) or more of consecutive differences of a natural number) exceeds a predetermined threshold. 1 or 2 mobile communication systems.
に、前記電界強度が予め定められた第１の閾値を下回る
回数を計数し、その計数値を前記速度情報として前記基
地局制御装置へ送信し、前記判定手段が、前記計数値と
予め定められた第２の閾値とを比較し、前記計数値が前
記第２の閾値を超えた場合に前記移動局の移動速度を高
速と判断することを特徴とする請求項１又は２の移動体
通信システム。4. The speed information generating means counts the number of times that the electric field strength falls below a predetermined first threshold at predetermined intervals, and uses the counted value as the speed information to the base station controller. Transmitting, the determination unit compares the count value with a predetermined second threshold value, and determines that the moving speed of the mobile station is high when the count value exceeds the second threshold value The mobile communication system according to claim 1 or 2, wherein:
周期毎に前記電界強度の第１の中央値を求め、当該第１
の中央値を前記速度情報として前記基地局制御装置へ送
信し、前記判定手段が、前記第１の所定周期のｎ倍（ｎ
は、２以上の整数）の第２の周期毎にｎ個の前記第１の
中央値の中央値を求めて第２の中央値とし、１周期前の
第２の中央値との差分を求め、ｐ個（ｐは、自然数）の
連続する差分のうちｑ個（ｑは、自然数；ｑ≦ｐ）以上
が所定の閾値を超えた場合に前記移動局の移動速度を高
速と判断することを特徴とする請求項１又は２の移動体
通信システム。5. The speed information generating means obtains a first median value of the electric field strength at every first predetermined cycle, and
Is transmitted to the base station controller as the speed information, and the determination means determines that the median value is n times (n
Is an integer greater than or equal to 2), the median value of the n first median values is determined for each second cycle and is set as the second median value, and the difference from the second median value one cycle before is determined. , The mobile station determines that the moving speed of the mobile station is high when q or more (p is a natural number; q ≦ p) or more of p (p is a natural number) consecutive differences exceed a predetermined threshold. The mobile communication system according to claim 1 or 2, wherein:
ら受信した信号を構成するフレームの長さのｍ倍（ｍ
は、２以上の整数）に等しい所定周期毎に前記電界強度
の中央値を求め、当該中央値より所定値だけ低い値を第
１の閾値として、前記所定周期毎に、前記電界強度が前
記第１の閾値を下回ることがあったフレームをいくつ含
むか計数して、その計数値を前記速度情報として前記基
地局制御装置へ送信し、前記判定手段が、前記計数値と
予め定められた第２の閾値とを比較し、前記計数値が前
記第２の閾値を超えた場合に前記移動局の移動速度を高
速と判断することを特徴とする請求項１又は２の移動体
通信システム。6. The speed information generating means according to claim 1, wherein said speed information generating means is m times (m) the length of a frame constituting a signal received from said mobile station.
Is an integer equal to or greater than 2) at each predetermined period equal to the median value of the electric field strength, and a value lower than the median value by a predetermined value is set as a first threshold value. Counting the number of frames that may have fallen below the threshold value of 1, and transmitting the counted value to the base station controller as the speed information, wherein the determining means determines the counted value and a second predetermined value. 3. The mobile communication system according to claim 1, wherein the moving speed of the mobile station is determined to be high when the count value exceeds the second threshold value. 4.
周期毎に前記電界強度の第１の中央値を求めるととも
に、前記移動局から受信した信号を構成するフレームの
長さのｍ倍（ｍは、２以上の整数）に等しい第２の所定
周期毎に前記電界強度の中央値を求め、当該中央値より
所定値だけ低い値を第１の閾値として、前記第２の所定
周期毎に、前記電界強度が前記第１の閾値を下回ること
があったフレームをいくつ含むか計数して計数値をもと
め、前記第１の中央値と前記計数値とを前記速度情報と
して前記基地局制御装置へ送信し、前記判定手段が、前
記第１の所定周期のｎ倍（ｎは、２以上の整数）の第３
の周期毎にｎ個の前記第１の中央値の中央値を求めて第
２の中央値とし、１周期前の第２の中央値との差分を求
め、ｐ個（ｐは、自然数）の連続する差分のうちｑ個
（ｑは、自然数；ｑ≦ｐ）以上が所定の閾値を超えた場
合、または、前記計数値と予め定められた第２の閾値と
を比較し、前記計数値が前記第２の閾値を超えた場合、
に前記移動局の移動速度を高速と判断することを特徴と
する請求項１又は２の移動体通信システム。7. The speed information generating means calculates a first median value of the electric field strength at every first predetermined period and m times the length of a frame constituting a signal received from the mobile station. (M is an integer of 2 or more), and a median value of the electric field strength is obtained at every second predetermined cycle, and a value lower than the median value by a predetermined value is set as a first threshold value, at each second predetermined cycle. Counting the number of frames in which the electric field strength may have fallen below the first threshold to obtain a count value, and using the first median value and the count value as the speed information, Transmitted to the device, and wherein the determination unit determines that the third predetermined period is n times (n is an integer of 2 or more) of the first predetermined period.
The median of the n first medians is determined and used as the second median at each cycle of. The difference from the second median one cycle before is determined, and p (p is a natural number) When q or more (q is a natural number; q ≦ p) or more of consecutive differences exceeds a predetermined threshold value, or the count value is compared with a second predetermined threshold value, and the count value is When exceeding the second threshold,
3. The mobile communication system according to claim 1, wherein the moving speed of the mobile station is determined to be high.
周期毎に前記電界強度の第１の中央値を求めるととも
に、前記移動局から受信した信号を構成するフレームの
長さのｍ倍（ｍは、２以上の整数）に等しい第２の所定
周期毎に前記電界強度の中央値を求め、当該中央値より
所定値だけ低い値を第１の閾値として、前記第２の所定
周期毎に、前記電界強度が前記第１の閾値を下回ること
があったフレームをいくつ含むか計数して計数値をもと
め、前記第１の中央値と前記計数値とを前記速度情報と
して前記基地局制御装置へ送信し、前記判定手段が、前
記第１の所定周期のｎ倍（ｎは、２以上の整数）の第３
の周期毎にｎ個の前記第１の中央値の中央値を求めて第
２の中央値とし、１周期前の第２の中央値との差分を求
め、ｐ個（ｐは、自然数）の連続する差分のうちｑ個
（ｑは、自然数；ｑ≦ｐ）以上が所定の閾値を超えた場
合であって、かつ前記計数値と予め定められた第２の閾
値とを比較し、前記計数値が前記第２の閾値を超えた場
合に、前記移動局の移動速度を高速と判断することを特
徴とする請求項１又は２の移動体通信システム。8. The speed information generating means calculates a first median value of the electric field strength at every first predetermined period, and obtains m times the length of a frame constituting a signal received from the mobile station. (M is an integer of 2 or more), and a median value of the electric field strength is obtained at every second predetermined cycle, and a value lower than the median value by a predetermined value is set as a first threshold value, at each second predetermined cycle. Counting the number of frames in which the electric field strength may have fallen below the first threshold to obtain a count value, and using the first median value and the count value as the speed information, Transmitted to the device, and wherein the determination unit determines that the third predetermined period is n times (n is an integer of 2 or more) of the first predetermined period.
The median of the n first medians is determined and used as the second median at each cycle of. The difference from the second median one cycle before is determined, and p (p is a natural number) In a case where q or more (q is a natural number; q ≦ p) or more of consecutive differences exceeds a predetermined threshold value, the count value is compared with a predetermined second threshold value, and the total number is calculated. 3. The mobile communication system according to claim 1, wherein when the numerical value exceeds the second threshold, the moving speed of the mobile station is determined to be high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10053551A JPH11252613A (en) | 1998-03-05 | 1998-03-05 | Mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10053551A JPH11252613A (en) | 1998-03-05 | 1998-03-05 | Mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11252613A true JPH11252613A (en) | 1999-09-17 |
Family
ID=12945945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10053551A Withdrawn JPH11252613A (en) | 1998-03-05 | 1998-03-05 | Mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11252613A (en) |
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