JPH09116949A - Dual mode position registration method - Google Patents
Dual mode position registration methodInfo
- Publication number
- JPH09116949A JPH09116949A JP26733595A JP26733595A JPH09116949A JP H09116949 A JPH09116949 A JP H09116949A JP 26733595 A JP26733595 A JP 26733595A JP 26733595 A JP26733595 A JP 26733595A JP H09116949 A JPH09116949 A JP H09116949A
- Authority
- JP
- Japan
- Prior art keywords
- mobile station
- communication system
- base station
- mobile communication
- mobile
- 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.)
- Granted
Links
- 230000009977 dual effect Effects 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 10
- 238000010295 mobile communication Methods 0.000 claims description 47
- 238000004891 communication Methods 0.000 claims description 12
- 230000001413 cellular effect Effects 0.000 description 54
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 208000027744 congestion Diseases 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000003371 toe Anatomy 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、サービスエリア
が少なくとも一部オーバラップした複数の移動通信シス
テムにおいて、これら複数の移動通信システムの何れと
も接続可能とされた、つまりデュアルモード移動局の位
置登録方法に関し、特にモード切り換えが頻繁に起きた
場合に共通制御チャネルが移動局の位置登録信号で輻輳
することを防止するデュアルモード位置登録法に係わる
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of mobile communication systems having service areas at least partially overlapping with each other, that is, connection to any of the plurality of mobile communication systems, that is, location registration of a dual mode mobile station. More particularly, the present invention relates to a dual mode location registration method for preventing the common control channel from being congested with location registration signals of mobile stations when mode switching frequently occurs.
【０００２】[0002]
【従来の技術】従来の位置登録法はＲＣＲ ＳＴＤ−２
７Ｃ（デジタル方式自動車電話システム標準規格）及び
桑原守二“デジタル移動通信”第１８６ページ〜第１８
８ページに記載されているように、移動局の初期登録位
置を中心に各移動局別個の位置登録エリアを設定するオ
ーバレイ形の位置登録エリア法を設定していた。つま
り、各移動局の初期位置登録時在圏セル（ゾーン）を中
心とした複数のセル（ゾーン）からなる登録エリアを設
定し、第２回目以降は、前回の設定した登録エリアをは
み出したときに行ない、新しいエリアは、再び各移動局
の在圏セルを中心に設定していた。上記オーバレイ形の
位置登録エリア法では、各在圏セルを中心とした登録エ
リアがセルと同じ個数だけ必要になる。実際には、各セ
ルのオーバレイ数を制限して運用されている。2. Description of the Related Art The conventional location registration method is RCR STD-2.
7C (Digital Car Telephone System Standard) and Moriji Kuwahara "Digital Mobile Communications" pages 186-18
As described on page 8, the overlay type position registration area method has been set in which the position registration area of each mobile station is set around the initial registration position of the mobile station. In other words, when registering an area consisting of multiple cells (zones) centering on the existing cell (zone) at the time of initial position registration of each mobile station, and from the second time onward, when the previously set registration area is exceeded. Then, the new area was set around the serving cell of each mobile station again. The overlay-type location registration area method requires the same number of registration areas as each cell in which the cell is located. In practice, the number of overlays in each cell is limited and used.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術は、１つ
の移動通信システムに閉じたサービスエリア内を移動す
る移動局の一斉呼び出しエリアを決定する位置登録には
有効であったが、接続する移動通信システムを切り換え
て通信を行なうデュアルモード移動通信の場合にはサー
ビスエリアが少なくとも一部オーバラップした複数の移
動通信システムのサービスエリア端で接続移動通信シス
テムの切り換え、いわゆるモード切り換えが頻繁に発生
し、モード切り換えに伴う位置登録により共通制御チャ
ネルの輻輳を起こすおそれがあった。図１にサービスエ
リアの概念図を用いて説明する。The above-mentioned prior art is effective for position registration for determining the paging area of a mobile station moving within a service area closed in one mobile communication system, but it is effective for mobile connection. In the case of dual-mode mobile communication in which communication systems are switched to perform communication, switching between connected mobile communication systems at the service area edge of a plurality of mobile communication systems in which service areas at least partially overlap, so-called mode switching frequently occurs. However, there was a risk of congestion of the common control channel due to location registration accompanying mode switching. The service area will be described with reference to FIG.
【０００４】移動通信システムＡのサービスエリア１内
にその位置登録エリア１１，１２が一部オーバラップし
て設けられ、移動通信システムＢのサービスエリア２に
その位置登録エリア２１，２２が一部オーバラップして
設けられている。移動通信システムＡ及びＢの何れとも
接続可能なデュアルモード移動局３１が移動通信システ
ムＡの閉じたサービスエリア１を移動する場合は、位置
登録エリア１１，１２を用いてオーバレイ形の位置登録
を行なうことができ、位置登録のトラヒックを最適にす
ることができる。またこのデュアルモード移動局３１が
移動通信システムＢの閉じたサービスエリア２を移動す
る場合は、位置登録エリア２１，２２を用いてオーバレ
イ形の位置登録を行なうことができ、位置登録のトラヒ
ックを最適にすることができる。The location registration areas 11 and 12 are provided in the service area 1 of the mobile communication system A so as to partially overlap each other, and the location registration areas 21 and 22 partially overlap in the service area 2 of the mobile communication system B. It is provided by wrapping. When the dual mode mobile station 31 connectable to both the mobile communication systems A and B moves in the closed service area 1 of the mobile communication system A, the overlay type position registration is performed using the position registration areas 11 and 12. It is possible to optimize the traffic for location registration. Further, when the dual mode mobile station 31 moves in the closed service area 2 of the mobile communication system B, overlay type position registration can be performed using the position registration areas 21 and 22, and the traffic for position registration is optimized. Can be
【０００５】しかしながら、デュアルモード移動局３１
が図１に示すように移動通信システムＡのサービスエリ
ア１のエリア端又は、移動通信システムＢのサービスエ
リア２のエリア端を横切る場合、これら移動通信システ
ムＡとＢではオーバレイ形の位置登録エリアを構成する
ことができず、サービスエリア端を構成するセルで、モ
ード切り換えに伴う位置登録が行なわれる。さらに、位
置登録要求信号は、ランダムアクセス信号であるため、
デュアルモード移動局３１がサービスエリア端を横切る
回数が多くなれば、移動局３１の位置登録信号で共通制
御チャネルが輻輳を起こすおそれがあった。However, the dual mode mobile station 31
1 crosses the area edge of the service area 1 of the mobile communication system A as shown in FIG. 1 or the area edge of the service area 2 of the mobile communication system B, these mobile communication systems A and B form an overlay type position registration area. Locations that cannot be configured and that compose the edge of the service area are registered with mode switching. Furthermore, since the location registration request signal is a random access signal,
If the number of times the dual-mode mobile station 31 crosses the service area edge increases, the common control channel may be congested by the location registration signal of the mobile station 31.
【０００６】[0006]
【課題を解決するための手段】この発明によれば、無線
基地局側で移動局から送信される信号が基準信号からず
れている時間を計測し、このずれ時間をもとにその移動
局の接続の可否を決定する。あるいは無線基地局で計測
した、移動局から送信される信号の基準信号からのずれ
時間と共に共通制御チャネルのトラヒックの輻輳状態を
もとにその移動局の接続の可否を決定する。According to the present invention, the time at which the signal transmitted from the mobile station deviates from the reference signal is measured on the radio base station side, and the mobile station of the mobile station is measured based on this time. Determines whether to connect. Alternatively, whether or not the mobile station can be connected is determined based on the deviation time of the signal transmitted from the mobile station from the reference signal measured by the radio base station and the traffic congestion state of the common control channel.
【０００７】さらに無線基地局側から位置登録を拒否さ
れた場合に、モードを切り換え動作を停止する。図２Ａ
を用いてこの発明の作用を説明する。図２で縦軸は移動
局の受信レベル、横軸に移動局の移動距離を示す。図２
には移動局が始めに移動通信システムＡにモード選択し
ている状態から移動局の移動にともなって移動通信シス
テムＢにモードを切り換える例を示してある。ここで、
移動局がモードを切り換える条件として、受信電力の高
いほうをモード選択する場合を示している。Further, when the location registration is rejected by the radio base station side, the mode is switched and the operation is stopped. Figure 2A
The operation of the present invention will be described using. In FIG. 2, the vertical axis represents the reception level of the mobile station and the horizontal axis represents the travel distance of the mobile station. FIG.
In the example, the mobile station first switches the mode to the mobile communication system B from the state in which the mode is selected for the mobile communication system A as the mobile station moves. here,
As a condition for the mobile station to switch modes, the case where the mode with higher received power is selected is shown.
【０００８】ａの位置に移動局がいるときは、移動通信
システムＡの無線基地局から送信される信号が、移動通
信システムＢの無線基地局から送信される信号よりも強
く移動局で受信されるため、移動局は移動通信システム
Ａを選択する。ここで、移動局がｂの位置に移動してく
ると、移動通信システムＢの無線基地局から送信される
信号が、移動通信システムＡの無線基地局から送信され
る信号よりもわずか強く移動局で受信されるため、移動
局では、移動通信システムＢに位置登録を行ない、モー
ドをＢに切り換えようとする。移動通信システムＢの無
線基地局では、移動局から送信された位置登録のための
ランダムアクセス信号Ｓ1 が、どれだけ基準信号（ずれ
がない場合の移動局からの上りチャネルの受信タイミン
グ）からずれているかを計測する。ここで、移動局が送
信する信号Ｓ1 が無線基地局で受信される場合の基準信
号からのずれの時間Ｔa は式（１）で表される。 Ｔa ＝２・１ｂ／Ｃ｛１ｂ：移動局と無線基地局間の距離、Ｃ：光速｝（１） Ｔa がパラメータとして決められた値より大きい場合
は、移動通信システムＢの無線基地局は、移動局からの
位置登録要求を拒絶する。各無線基地局で基準信号と移
動局からのバースト信号Ｓ1 の前縁との時間間隔Ｔa を
測定して、このＴ a をその移動局へ通知して無線基地局
で次の受信タイムスロットに割当てられた移動局からの
バースト信号Ｓ2 が、その直前のタイムスロットの移動
局のバースト信号の後部と重ならないように移動局にＴ
a を通知してＴa だけ早く送信するようにさせる。つま
りその無線基地局の近くの移動局より、その無線基地局
のセルの境付近の遠い移動局からのバースト信号が伝搬
遅延のため、次のタイムスロットに割当てられたその無
線基地局に近い移動局からのバースト信号と重ならない
ようにするため、無線基地局では基準信号と移動局から
のバースト信号との時間間隔Ｔa を測定しており、この
測定時間内Ｔa から、その無線基地局からその移動局１
ｂまでのおおよその距離を知り、この距離１ｂが大であ
る場合は、その移動局は、移動通信システムＢのサービ
スエリア２の境界に近いが、まだサービスエリア２内に
十分入っていないと判断し、移動通信システムＡとＢと
の接続切り換え、つまりモード切り換えが頻繁に行わ
れ、位置登録要求が短時間で何回も繰り返されないよう
に無線基地局で位置登録要求を拒絶する。When there is a mobile station at the position a, the mobile communication
The signal transmitted from the radio base station of System A is
Stronger than the signal transmitted from the wireless base station of the communication system B
The mobile station is a mobile communication system.
Select A. Here, the mobile station moves to the position of b.
Then, it is transmitted from the radio base station of the mobile communication system B.
The signal is transmitted from the radio base station of mobile communication system A.
The signal received by the mobile station is slightly stronger than the
The station registers its location in mobile communication system B and
Try to switch the mode to B. No mobile communication system B
In the line base station, for the location registration sent from the mobile station
Random access signal S1However, how much the reference signal (deviation
Reception timing of the uplink channel from the mobile station when there is no
Measure). Here, the mobile station sends
Signal S to receive1Reference signal when is received by a wireless base station
Time T from the issueaIs represented by formula (1). Ta= 2.1b / C {1b: distance between mobile station and radio base station, C: speed of light} (1) TaIs larger than the value determined as the parameter
Is a radio base station of the mobile communication system B from the mobile station.
Reject location registration request. Each radio base station transfers the reference signal
Burst signal S from the mobile station1Time interval T with the leading edge ofaTo
Measure this T aTo the mobile station
From the mobile station assigned to the next receive time slot at
Burst signal STwoBut the time slot just before that moved
T to the mobile station so that it does not overlap the rear part of the burst signal of the station.
aTo notify TaOnly send it as soon as possible. Toes
From a mobile station near the wireless base station
Burst signal from a distant mobile station near the cell boundary propagates
Because of the delay, the null assigned to the next timeslot
Line signals do not overlap with burst signals from mobile stations close to the base station
In order to ensure that the radio base station
Time interval T with the burst signal ofaIs measuring
Within measurement time TaFrom the wireless base station to the mobile station 1
Knowing the approximate distance to b, this distance 1b is large
If the mobile station does not
It is close to the boundary of area 2, but still within service area 2.
It is judged that the mobile communication systems A and B have not entered enough.
Connection switching, that is, mode switching frequently
The location registration request is not repeated many times in a short time.
The wireless base station rejects the location registration request.
【０００９】移動局では、このように位置登録要求が拒
絶された場合には、移動局と無線基地局間のエアインタ
フェースの共通制御チャネルの輻輳を防止するために、
一定時間の間、位置登録要求を中止して移動通信システ
ムＡにモードをとどめる。さらに移動局がｃの位置まで
移動し、再度、モードをＢへ切り換えようとした場合、
移動通信システムＢの無線基地局では、移動局から送信
された位置登録のためのランダムアクセス信号が、どれ
だけ基準信号からずれているかを計測する。In the mobile station, when the location registration request is rejected in this way, in order to prevent congestion of the common control channel of the air interface between the mobile station and the radio base station,
The position registration request is canceled and the mobile communication system A remains in the mode for a certain period of time. When the mobile station further moves to the position of c and tries to switch the mode to B again,
The radio base station of the mobile communication system B measures how much the random access signal for position registration transmitted from the mobile station deviates from the reference signal.
【００１０】 Ｔ＝２・１ｃ／Ｃ ｛１ｃ：移動局と無線基地局間の距離｝ （２） ここで計測したＴがパラメータとして決められた値より
小さい場合は、移動通信システムＢの無線基地局は、移
動局が充分Ｂのサービスエリア２内に入りモード選択の
ばたつきを起こさないと判断して、移動局の位置登録要
求を受付け、移動通信システムＢへの接続を許可する。T = 2.1 · c / C {1c: Distance between mobile station and radio base station} (2) If T measured here is smaller than a value determined as a parameter, the radio base of the mobile communication system B The station judges that the mobile station is sufficiently within the service area 2 of B and does not cause the flutter of mode selection, accepts the position registration request of the mobile station, and permits the connection to the mobile communication system B.
【００１１】あるいは、計測したＴのみで判断すること
なく、このＴがパラメータとして決められた値より小さ
く、かつ、その無線基地局と交換局間の共通制御チャネ
ルが輻輳していない場合に、移動通信システムＢの無線
基地局は、移動局が充分Ｂのサービスエリア２内に入り
モード選択のばたつきを起こさないと判断して、移動局
の位置登録要求を受付け、移動通信システムＢへの接続
を許可する。Alternatively, if the T is smaller than the value determined as the parameter and the common control channel between the radio base station and the switching center is not congested without judging only by the measured T, the mobile station moves. The radio base station of the communication system B judges that the mobile station is sufficiently within the service area 2 of B and does not cause the flutter of mode selection, accepts the location registration request of the mobile station, and connects to the mobile communication system B. To give permission.
【００１２】[0012]
【発明の実施の形態】図３はこの発明の１実施例を示し
た図である。図３では衛星を用いた移動通信システムの
サービスエリア１と、地上系セルラ電話のサービスエリ
ア２とがオーバラップし、かつ、地上系セルラ電話のサ
ービスエリア２に飛び地２３がある場合である。衛星を
用いた移動通信システム（以下衛星系）の無線基地局４
０は、衛星通信交換局４２を通じて関門交換局４４と接
続され、地上系セルラ電話基地局４１は地上系セルラ電
話交換局４３を通じて関門交換局４４と接続されてい
る。衛星通信交換局４２及び地上セルラ電話交換局４３
は位置登録メモリ４５と接続され、関門交換局４４は一
般電話網４６と接続されている。地上系セルラ電話基地
局４１はそのアンテナ７１を通じデュアルモード移動局
３０と通信することができ、また衛星系無線基地局４０
はそのアンテナ７０を介して更に通信衛星１２０を介し
て移動局３０と通信することができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a diagram showing one embodiment of the present invention. In FIG. 3, the service area 1 of the mobile communication system using satellites and the service area 2 of the terrestrial cellular phone overlap each other, and the service area 2 of the terrestrial cellular phone has an enclave 23. Radio base station 4 of a mobile communication system using satellites (hereinafter referred to as satellite system)
0 is connected to the gateway exchange 44 through the satellite communication exchange 42, and the terrestrial cellular telephone base station 41 is connected to the gateway exchange 44 through the terrestrial cellular telephone exchange 43. Satellite communication switching center 42 and terrestrial cellular telephone switching center 43
Is connected to the location registration memory 45, and the gateway exchange 44 is connected to the general telephone network 46. The terrestrial cellular telephone base station 41 can communicate with the dual mode mobile station 30 through its antenna 71, and the satellite radio base station 40.
Can communicate with the mobile station 30 via its antenna 70 and via a communication satellite 120.
【００１３】移動局３０は地上系セルラ電話の圏内（サ
ービスエリア２内）では地上系セルラ電話にモードを選
択し、地上系セルラ電話の圏外で衛星系にモードを選択
する。移動局３０が衛星系にモード選択している場合
に、地上系サービスエリアの飛び地２３に進入すると、
移動局３０は地上系セルラ電話基地局４１からの信号が
受信され、地上系にモード選択するために位置登録要求
を地上系セルラ電話無線基地局４１に送信する。地上系
セルラ電話無線基地局４１では移動局３０が送信した位
置登録要求の信号の基準信号との時間のずれを測定す
る。ここで、移動局３０は、地上系セルラ電話のサービ
スエリアの飛び地２３に位置するため、つまり無線基地
局４１から比較的遠くに位置しているため、地上系セル
ラ電話無線基地局４１で計測された基準信号との時間の
ずれが大きく、地上系セルラ電話無線基地局４１は、移
動局３０に向けて位置登録を拒絶する通知を送信する。
同様に、移動局３０が地上系セルラ電話のサービスエリ
ア端で位置登録信号を送信した場合も、地上系セルラ電
話無線基地局４１で計測された基準信号との時間のずれ
が大きいため地上系セルラ電話無線基地局４１は、移動
局に向けて位置登録を拒絶する通知を送信する。位置登
録を拒絶された移動局３０は所定時間、衛星系にモード
をとどめる。つまり移動局３０で在圏エリアの変化を監
視する動作を所定時間停止するが、この監視は行い、従
ってその監視周期ごとに地上系セルラ電話圏内に入った
ことを検出するが、地上系にモード選択するための位置
登録要求の送出は所定時間行なわないようにする。この
所定時間は、移動局３０が自動車電話機の場合は比較的
短く、携帯電話機の場合は比較的長い、など機種によ
り、またセルの大きさなどにより予め決められる。The mobile station 30 selects the mode for the terrestrial cellular telephone within the area of the terrestrial cellular telephone (within the service area 2), and selects the mode for the satellite system outside the area of the terrestrial cellular telephone. When the mobile station 30 selects the satellite system mode and enters the enclave 23 of the ground system service area,
The mobile station 30 receives the signal from the terrestrial cellular telephone base station 41 and transmits a position registration request to the terrestrial cellular telephone radio base station 41 for mode selection to the terrestrial system. The terrestrial cellular telephone radio base station 41 measures the time lag between the position registration request signal transmitted by the mobile station 30 and the reference signal. Here, since the mobile station 30 is located at the enclave 23 in the service area of the terrestrial cellular telephone, that is, is located relatively far from the radio base station 41, the terrestrial cellular telephone radio base station 41 measures the mobile station 30. The time difference from the reference signal is large, and the terrestrial cellular telephone radio base station 41 sends a notification to the mobile station 30 to reject the location registration.
Similarly, when the mobile station 30 transmits a location registration signal at the service area edge of a terrestrial cellular telephone, the terrestrial cellular telephone has a large time lag from the reference signal measured by the terrestrial cellular telephone radio base station 41. The telephone wireless base station 41 transmits a notification of refusing the location registration to the mobile station. The mobile station 30 whose position registration has been refused keeps the mode in the satellite system for a predetermined time. That is, the operation of monitoring the change of the area in which the mobile station 30 is located is stopped for a predetermined time, but this monitoring is performed, and therefore, it is detected that the mobile phone 30 has entered the terrestrial cellular telephone service area at each monitoring cycle. The position registration request for selection is not sent for a predetermined time. This predetermined time is determined in advance depending on the model, such as when the mobile station 30 is a mobile phone, it is relatively short, and when it is a mobile phone, it is relatively long, and on the size of the cell.
【００１４】あるいは、地上系セルラ電話基地局４１ま
たは地上系セルラ電話交換局４３で監視するエアインタ
フェースの共通制御チャネルまたは地上系セルラ電話基
地局４１と地上系セルラ電話交換局４３間の共通制御チ
ャネルのトラヒックが輻輳している場合には地上系セル
ラ電話無線基地局４１は、移動局３０に向けて位置登録
を拒絶する通知を送信する。ここで、位置登録を拒絶さ
れた移動局３０は、衛星系にモードを保持したままにに
なる。Alternatively, a common control channel of the air interface monitored by the terrestrial cellular telephone base station 41 or the terrestrial cellular telephone exchange station 43 or a common control channel between the terrestrial cellular telephone base station 41 and the terrestrial cellular telephone exchange station 43. If the traffic is congested, the terrestrial cellular telephone radio base station 41 sends a notification to the mobile station 30 to reject the location registration. Here, the mobile station 30 whose position registration has been refused remains in the mode maintained in the satellite system.
【００１５】移動局３０が、地上系セルラ電話のサービ
スエリア２に充分入り込んでいると、移動局３０と無線
基地局４１との間の距離が比較的小さく、地上系セルラ
電話無線基地局４１で計測された基準信号との時間のず
れが小さくなるので、地上系セルラ電話無線基地局４１
は、移動局に向けて位置登録を許可する通知を送信す
る。移動局３０は位置登録の許可を受信すると位置登録
のための信号を地上系セルラ電話無線基地局４１と送受
して、モードを地上系セルラ電話に選択する。When the mobile station 30 is sufficiently in the service area 2 of the terrestrial cellular telephone, the distance between the mobile station 30 and the radio base station 41 is relatively small, and the terrestrial cellular telephone radio base station 41 is used. Since the time lag from the measured reference signal becomes small, the terrestrial cellular telephone radio base station 41
Sends a notification for permitting location registration to the mobile station. When the mobile station 30 receives the location registration permission, it transmits and receives a signal for location registration to and from the terrestrial cellular telephone radio base station 41 to select the mode as the terrestrial cellular telephone.
【００１６】つまり図３において、移動局３０が左から
右へ移動し、飛び地２３に入ると、その位置Ｐ1 で従来
においては曲線２００に示すように移動局３０は地上系
セルラ電話を選択し、この飛び地２３を通過した位置Ｐ
2 で衛星系電話を選択し、再び地上系セル電話のサービ
スエリア２に入ると、その位置Ｐ3 で直ちに地上系セル
電話を選択する。しかしこの発明では曲線３００に示す
ように、位置Ｐ1 での位置登録要求は拒絶され、飛び地
２３を通過中は衛星系電話を選択したままであり、地上
系セルラ電話サービスエリア２に入った直後の位置Ｐ3
では位置登録要求が拒絶され、このサービスエリア２内
に十分入った位置Ｐ4 で始めて地上系セルラ電話への位
置登録が許可される。このように、地上系セルラ電話の
サービスエリア２の端では、地上系セルラ電話への位置
登録要求が拒絶されるため、地上系と衛星系との切り換
えが頻繁に起こることなく、共通制御チャネルの輻輳も
生じない。That is, in FIG. 3, when the mobile station 30 moves from left to right and enters the enclave 23, the mobile station 30 conventionally selects the terrestrial cellular telephone at the position P 1 as shown by the curve 200. , The position P that passed this enclave 23
When the satellite telephone is selected at 2 and the terrestrial cell telephone service area 2 is entered again, the terrestrial cell telephone is immediately selected at the position P 3 . However, according to the present invention, as shown by the curve 300, the position registration request at the position P 1 is rejected, the satellite type telephone remains selected while passing through the enclave 23, and immediately after entering the terrestrial cellular telephone service area 2. Position P 3
Then, the position registration request is rejected, and the position registration to the terrestrial cellular telephone is permitted only at the position P 4 sufficiently within the service area 2. As described above, at the end of the service area 2 of the terrestrial cellular telephone, the position registration request to the terrestrial cellular telephone is rejected, so that switching between the terrestrial system and the satellite system does not occur frequently, and the common control channel No congestion occurs.
【００１７】図４にこの発明において用いられる基地局
及びデュアルモード移動局の各構成の例を示す。移動局
３０では衛星系移動局送信機５５及び衛星系移動局受信
機５６が送受信共用器８０を通じて衛星系移動局アンテ
ナ７２に接続され、また地上系移動局送信機５７及び地
上系移動局受信機５８が送受信共用器８１を通じて地上
系移動局アンテナ７３に接続されている。制御信号生成
回路９１及び音声符号化回路９２の各出力側が両送信機
５５及び５７の入力側に接続され、両受信機５６及び５
８の各出力側が制御信号解読回路９３及び音声復号化回
路９４の各入力側は接続され、音声符号化回路９２の入
力側及び音声復号化回路９４の出力側がハンドセット９
６に接続される。地上系移動局受信機５８は受信レベル
検出回路９５に接続され、受信レベル検出回路９５の出
力側は移動機制御回路９０に接続される。FIG. 4 shows an example of each configuration of the base station and the dual mode mobile station used in the present invention. In the mobile station 30, the satellite mobile station transmitter 55 and the satellite mobile station receiver 56 are connected to the satellite mobile station antenna 72 through the transmission / reception duplexer 80, and the terrestrial mobile station transmitter 57 and the terrestrial mobile station receiver. Reference numeral 58 is connected to the terrestrial mobile station antenna 73 through the transmission / reception duplexer 81. The output sides of the control signal generation circuit 91 and the voice coding circuit 92 are connected to the input sides of both transmitters 55 and 57, and both receivers 56 and 5 are connected.
The output side of 8 is connected to the input sides of the control signal decoding circuit 93 and the voice decoding circuit 94, and the input side of the voice encoding circuit 92 and the output side of the voice decoding circuit 94 are connected to the handset 9.
6 is connected. The terrestrial mobile station receiver 58 is connected to the reception level detection circuit 95, and the output side of the reception level detection circuit 95 is connected to the mobile unit control circuit 90.
【００１８】衛星通信用無線基地局４０では、衛星系無
線基地局用送信機５１及び衛星系無線基地局用受信機５
２が送受信共用器８２を介して衛星系無線基地局用アン
テナ７０に接続され、入力された報知情報、呼処理信号
は基地局フレーム構成回路６０でフレームに構成されて
送信機５１へ出力される。地上系セルラ電話基地局４１
では地上系セルラ電話無線基地局用送信機５３及び地上
系セルラ電話無線基地局用受信機５４が送受信共用器８
３を介して地上系セルラ電話無線基地局用アンテナ７１
に接続され、入力された報知情報及び呼処理信号は基地
局フレーム構成回路６１でフレームに構成されて送信機
５３へ出力され、受信機５４よりの受信情報はタイムア
ライメント測定回路９７に入力され、基準信号との時間
ずれが測定され、これに応じた呼処理がなされる。In the satellite communication radio base station 40, a satellite radio base station transmitter 51 and a satellite radio base station receiver 5 are provided.
2 is connected to the satellite radio base station antenna 70 through the transmission / reception duplexer 82, and the input broadcast information and call processing signal are framed by the base station frame configuration circuit 60 and output to the transmitter 51. . Terrestrial cellular telephone base station 41
Then, the transmitter 53 for the terrestrial cellular telephone radio base station and the receiver 54 for the terrestrial cellular telephone radio base station are the transmitter / receiver 8
Antenna 71 for terrestrial cellular telephone radio base station via 3
And the input broadcast information and call processing signal are framed by the base station frame configuration circuit 61 and output to the transmitter 53, and the received information from the receiver 54 is input to the time alignment measurement circuit 97. The time lag from the reference signal is measured, and call processing is performed accordingly.
【００１９】移動局３０は、通信衛星１２０を介して衛
星系の無線基地局４０から送信される共通制御チャネル
信号と、地上系セルラ電話の無線基地局４１から送信さ
れる共通制御チャネル信号を監視する。ここで地上系セ
ルラ電話の無線基地局４１から送信される共通制御チャ
ネル信号が移動局３０で受信され、受信レベル検出回路
９５で地上系セルラ電話の入圏レベルを超える電力が検
出されると、移動局３０は、地上系セルラ電話に接続す
るために、位置登録要求（ランダムアクセス信号）を制
御信号生成回路９１で作成し、地上系移動局送信機５
７、送受信共用器８１、地上系移動局アンテナ７３を通
じて、地上系セルラ電話の共通制御チャネルにアクセス
して地上系セルラ電話の無線基地局４１に送信する。地
上系セルラ電話の無線基地局４１では移動局３０から送
信されたランダムアクセス信号を受信すると基準信号と
のずれをタイムアライメント測定回路９７で計測する。
この計測された基準信号とのずれが大きい場合は、移動
局３０の位置が地上系セルラ電話のサービスエリア端で
あり、モード選択のばたつきを起こす可能性があると判
断し、あるいは交換局との間の共通制御チャネルが輻輳
を起こしていると判断した場合、位置登録を拒否する旨
の情報を、フレーム構成回路６１、送信機５３、送受信
共用器８３、基地局アンテナ７１を用いて共通制御チャ
ネルをとうして移動局３０に通知する。計測された基準
信号とのずれが小さい場合は、移動局３０が地上系セル
ラ電話の無線基地局４１に近い場所にいて、地上系セル
ラ電話のサービスエリア内に充分入り込み、モード選択
のばたつきを起こす可能性が少ないと判断し、位置登録
を受付ける旨の情報をフレーム構成回路６１、送信機５
３、送受信共用器８３、基地局アンテナ７１を用いて共
通制御チャネルをとうして移動局３０に通知する。移動
局３０では位置登録が地上系セルラ電話になされている
場合は、地上系セルラ電話無線基地局４１を通じて発着
呼を行ない、位置登録が衛星系になされている場合は、
通信衛星１２０、衛星系無線基地局４０を通じて発着呼
を行なう。The mobile station 30 monitors the common control channel signal transmitted from the satellite radio base station 40 via the communication satellite 120 and the common control channel signal transmitted from the terrestrial cellular telephone radio base station 41. To do. Here, when the common control channel signal transmitted from the radio base station 41 of the terrestrial cellular telephone is received by the mobile station 30 and the reception level detection circuit 95 detects the power exceeding the entry level of the terrestrial cellular telephone, The mobile station 30 creates a position registration request (random access signal) by the control signal generation circuit 91 in order to connect to the terrestrial cellular telephone, and the terrestrial mobile station transmitter 5
7, the common control channel of the terrestrial cellular telephone is accessed and transmitted to the radio base station 41 of the terrestrial cellular telephone through the transmission / reception duplexer 81 and the terrestrial mobile station antenna 73. Upon receiving the random access signal transmitted from the mobile station 30, the radio base station 41 of the terrestrial cellular telephone measures the deviation from the reference signal by the time alignment measuring circuit 97.
If the deviation from the measured reference signal is large, it is determined that the position of the mobile station 30 is at the end of the service area of the terrestrial cellular telephone, and there is a possibility of causing a flutter in mode selection, or it is determined that the mobile station 30 is in contact with the exchange. When it is determined that the common control channel between them is congested, information indicating that the location registration is rejected is sent to the common control channel using the frame configuration circuit 61, the transmitter 53, the transmission / reception duplexer 83, and the base station antenna 71. Then, the mobile station 30 is notified. When the deviation from the measured reference signal is small, the mobile station 30 is located near the radio base station 41 of the terrestrial cellular phone and sufficiently enters into the service area of the terrestrial cellular phone, causing a flutter of mode selection. It is determined that the possibility is low, and information indicating that the location registration is accepted is sent to the frame configuration circuit 61 and the transmitter 5.
3, the transmission / reception duplexer 83, and the base station antenna 71 are used to notify the mobile station 30 through the common control channel. In the mobile station 30, if the location registration is made by the terrestrial cellular telephone, the call is made through the terrestrial cellular telephone radio base station 41, and if the location registration is made by the satellite system,
Incoming and outgoing calls are made through the communication satellite 120 and the satellite radio base station 40.
【００２０】上記実施例では地上系セルラ電話と移動体
衛星通信間のモード切り換えの例をあげたが、地上系セ
ルラ電話とそれとは異なる地上系セルラ電話間のモード
切り換えの場合の位置登録制御にもこの発明を適用する
ことができる。In the above embodiment, an example of mode switching between the terrestrial cellular telephone and the mobile satellite communication is given. However, the position registration control is performed in the case of mode switching between the terrestrial cellular telephone and a different terrestrial cellular telephone. This invention can also be applied.
【００２１】[0021]
【発明の効果】以上説明したようにこの発明によれば、
モードを選択する場合のばたつきを押さえ、モード切り
換えが頻繁に起きた場合でも共通制御チャネルが移動機
の位置登録信号で輻輳することを防止する効果がある。As described above, according to the present invention,
This has the effect of suppressing the flutter when selecting the mode and preventing the common control channel from congesting with the location registration signal of the mobile device even when the mode switching frequently occurs.
【図１】少なくとも一部のサービスエリアがオーバラッ
プした二つの移動通信システムのサービスエリアの概念
を示す図。FIG. 1 is a diagram showing a concept of service areas of two mobile communication systems in which at least some service areas overlap.
【図２】Ａは二つの移動通信システムＡ，Ｂの無線基地
局から受信レベルと、移動局でのモード切り換えの概念
を示す図、Ｂは地上系セルラ電話無線基地局でのタイム
アライメント測定における移動局からの受信信号と基準
信号とのずれを示す図である。FIG. 2A is a diagram showing a reception level from radio base stations of two mobile communication systems A and B and a concept of mode switching at the mobile station, and B is a time alignment measurement at a terrestrial cellular radio base station. It is a figure which shows the deviation of the received signal from a mobile station, and a reference signal.
【図３】この発明の１実施例が適用された移動通信シス
テムとそのサービスエリアとモード選択の従来技術とこ
の発明とを示す図。FIG. 3 is a diagram showing a mobile communication system to which an embodiment of the present invention is applied, a service area of the mobile communication system, a conventional technique of mode selection, and the present invention.
【図４】この発明の方法に用いられる移動局および基地
局の構成例を示すブロック図。FIG. 4 is a block diagram showing a configuration example of a mobile station and a base station used in the method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上田 隆 東京都港区虎ノ門二丁目10番１号 エヌ・ ティ・ティ移動通信網株式会社内 (72)発明者 渡部 俊幸 東京都千代田区丸の内二丁目２番１号 日 本船舶通信株式会社内 (72)発明者 山本 晃広 東京都千代田区丸の内二丁目２番１号 日 本船舶通信株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Ueda 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd. (72) Inventor Toshiyuki Watanabe 2-chome Marunouchi, Chiyoda-ku, Tokyo 2-1 Nihon Ship Communications Co., Ltd. (72) Inventor Akihiro Yamamoto 2-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Ship Communication Co., Ltd.
Claims (4)
移動通信システムと、サービスエリアが少なくとも一部
オーバラップした上記移動通信システム以外の移動通信
システムとの間で、移動局と接続する移動通信システム
を切り換えて通信を行なうデュアルモード移動通信シス
テムにおける無線基地局側で移動局から送信される信号
が基準信号からずれている時間を計測し、 この計測したずれ時間をもとにその移動局のその無線基
地局の移動通信システムとの接続の可否を決定すること
を特徴とするデュアルモード位置登録法。1. A mobile communication system for connecting to a mobile station between a mobile communication system comprising a plurality of cells forming a service area and a mobile communication system other than the mobile communication system in which the service areas at least partially overlap each other. In the dual-mode mobile communication system that switches between the two modes, the radio base station side measures the time during which the signal transmitted from the mobile station deviates from the reference signal, and based on this measured deviation time, the A dual-mode location registration method, which determines whether or not a wireless base station can be connected to a mobile communication system.
ステムは移動体衛星通信システムであることを特徴とす
る請求項１記載のデュアルモード位置登録法。2. The dual mode location registration method according to claim 1, wherein the mobile communication system other than the mobile communication system is a mobile satellite communication system.
トラヒック量を計測し、その計測したトラヒック量と、
上記ずれ時間とにもとづき上記接続の可否を決定するこ
とを特徴とする請求項１又は２記載のデュアルモード位
置登録法。3. The traffic volume of a common control channel is measured on the side of the radio base station, and the measured traffic volume and
3. The dual mode location registration method according to claim 1, wherein whether or not the connection is possible is determined based on the shift time.
ムの無線基地局側から接続の拒否を通知されると、以前
に位置登録していた移動通信システムとの接続モードに
とどめることを特徴とする請求項１乃至３の何れかに記
載のデュアルモード位置登録法。4. When the mobile station is notified from the radio base station side of the newly selected mobile communication system that the connection is rejected, the mobile station stays in the connection mode with the mobile communication system whose location was previously registered. The dual mode location registration method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26733595A JP3151395B2 (en) | 1995-10-16 | 1995-10-16 | Dual mode location registration method, mobile communication system using the same, and radio base station used in the mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26733595A JP3151395B2 (en) | 1995-10-16 | 1995-10-16 | Dual mode location registration method, mobile communication system using the same, and radio base station used in the mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09116949A true JPH09116949A (en) | 1997-05-02 |
| JP3151395B2 JP3151395B2 (en) | 2001-04-03 |
Family
ID=17443397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26733595A Expired - Fee Related JP3151395B2 (en) | 1995-10-16 | 1995-10-16 | Dual mode location registration method, mobile communication system using the same, and radio base station used in the mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3151395B2 (en) |
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| US7590424B2 (en) | 2001-03-29 | 2009-09-15 | Ntt Docomo, Inc. | Position measuring method and mobile communication terminal |
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| JP2010277587A (en) * | 2009-05-27 | 2010-12-09 | Nec (China) Co Ltd | Method, device and system for transmitting information |
| WO2022254741A1 (en) * | 2021-06-03 | 2022-12-08 | 楽天モバイル株式会社 | Communication control device, communication control method, and communication control program |
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|---|---|
| JP3151395B2 (en) | 2001-04-03 |
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