JPS58111443A - Mobile radio communication system - Google Patents
Mobile radio communication systemInfo
- Publication number
- JPS58111443A JPS58111443A JP56209028A JP20902881A JPS58111443A JP S58111443 A JPS58111443 A JP S58111443A JP 56209028 A JP56209028 A JP 56209028A JP 20902881 A JP20902881 A JP 20902881A JP S58111443 A JPS58111443 A JP S58111443A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- station
- mobile
- area
- electric field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、主として蜂の巣状に設けられた複数のサービ
スエリアにおいて、移動する自動車のチャネル接続率及
び基地局設備の利用率を向上することのできる移動無線
通信方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile radio communication system that can improve the channel connection rate of moving automobiles and the utilization rate of base station equipment mainly in a plurality of service areas arranged in a honeycomb shape.
従来、この種のシステムにおいて、各基地局が移動局と
接続して通話を行う領域、即ちサービスエリアの広さを
限定するために、移動局からの入力電界値の判断基準は
固定的に一定に決められている。そして、各基地局の設
備容量は。Conventionally, in this type of system, in order to limit the area in which each base station connects with a mobile station and makes a call, that is, the size of the service area, the criteria for determining the input electric field value from the mobile station is fixed and constant. It is determined that And what is the installed capacity of each base station?
この受持ちサービスエリア内における見込みの呼量によ
り、一定の接続率が得られるように設計されている。そ
のために、（１）最大容量−ばいの呼量を扱っていれば
隣接サービスエリアより流入する通話継続中の移動局を
追跡切替できないこと、（２）最大容量以上の発着信呼
はすべて不接続となること、および（３）設計した呼量
と実態の差は、そのまま一方のサービスエリアにおいて
設備不足となり、他方のサービスエリアにおいては設備
過剰となって互に融通性をもたせることができないとい
う欠点があった。It is designed to provide a constant connection rate based on the expected call volume within this assigned service area. For this reason, (1) if the call volume is less than the maximum capacity, it will not be possible to track and switch mobile stations with ongoing calls flowing in from adjacent service areas, and (2) all incoming and outgoing calls exceeding the maximum capacity will be disconnected. (3) The difference between the designed call volume and the actual situation will result in a lack of equipment in one service area and an excess of equipment in the other service area, making it impossible to provide mutual flexibility. was there.
本発明の目的は、上記従来技術の欠点を解決し、隣接基
地局間の設備の使用に対し相互に融通性を持たせ、チャ
ネルの接続率及び設備の利用率を高めることのできる移
動無線通信方式を提供するにある。An object of the present invention is to solve the above-mentioned drawbacks of the prior art, provide mutual flexibility in the use of equipment between adjacent base stations, and improve the channel connection rate and equipment utilization rate in mobile radio communications. There is a method to provide.
本発明によれば、互に隣接し、それぞれ予め割当てられ
た領域を有する複数のサービスエリアと、これ等サービ
スエリアのそれぞれに対応して配された複数の基地局と
、これ等複数の基地局を統括する制御局と、前記複数の
サービスエリアを移動する複数の移動局とにより構成さ
れ、前記移動局から基地局に到達する入力電界値が予め
決められた判断基準以上の時のみ、該Ｐ１−
移動局と結ばれる回線を基地局間で引き継ぐようにした
移動無線通信方式において、前記制御局、前記移動局に
接続中の基地局および該基地局に隣接する基地局のうち
のいずれかの局が該当する基地局の入力電界情報に対す
る判断基準を変更することによって、前記回線の引き継
ぎを行うサービスエリアの切替地点を変えるべく制御す
るようにしたことを特徴とする移動無線通信方式が得ら
れる。According to the present invention, there are a plurality of service areas that are adjacent to each other and each has a pre-allocated area, a plurality of base stations arranged corresponding to each of these service areas, and a plurality of base stations such as and a plurality of mobile stations moving in the plurality of service areas, and only when the input electric field value reaching the base station from the mobile station is equal to or higher than a predetermined criterion, - In a mobile radio communication system in which a line connected to a mobile station is taken over between base stations, one of the control station, a base station connected to the mobile station, and a base station adjacent to the base station A mobile radio communication system is obtained in which the station controls to change the switching point of the service area where the line is taken over by changing the criteria for input electric field information of the corresponding base station. .
次に９本発明による移動無線通信方式について実施例を
挙げ２図面を参照して説明する。Next, a mobile radio communication system according to the present invention will be described with reference to two embodiments and two drawings.
第１図は本発明による実施例を説明するための部分的な
システム系統図である“。この図において、１〜３は基
地局、４〜６は標準サービスエリア、７は縮少サービス
エリア；８は移動局。FIG. 1 is a partial system diagram for explaining an embodiment of the present invention. In this figure, 1 to 3 are base stations, 4 to 6 are standard service areas, and 7 is a reduced service area; 8 is a mobile station.
９ａ、９ｂ、 １０ａ、１０ｂは境界線、１１は移動局
の移動経路、そして、１２は制御局である。このような
サービスエリアにおいて、移動局８が移動線路１１に沿
って点ｐ１がらｐ８の方へ移動するとき、移動局８から
送信された信号がそれぞれの基地局１，２および６に到
達する電界強度の変化を示す以下余白
と、第２図の折線ａ、ｂおよびＣのようになる。9a, 9b, 10a, and 10b are boundary lines, 11 is a moving route of the mobile station, and 12 is a control station. In such a service area, when the mobile station 8 moves along the moving line 11 from point p1 to p8, the electric field in which the signal transmitted from the mobile station 8 reaches each base station 1, 2, and 6 The margin below shows the change in intensity, and the broken lines a, b, and C in FIG. 2 are shown.
まず、標準サービスエリア４，５および６の活用時にお
ける動作について説明すると、それぞれの基地局１，２
および３は移動局がらうける入力電界レベル１１〜ｉ４
の範囲を判断基準とし、移動局の位置情報として１３図
に見られるレベル情報ｔ、〜ｔ５が制御局へ向って送出
されるべく使用される。いま、移動局８が通信を継続し
ながら移動経路１１ｉ移動する場合、最初の境界線９ａ
（点ｐ２）ｋ通過すると、基地局１における入力電界は
人力レベル′１′２よシ低下し、基地局１がら制御局１
２に対して第３図のレベル情報ｔ２が送出される。制御
局１２は、これを基地局１の受信入力電界が劣化した信
号（以下レベル劣化信号とする）として受け、移動局８
が標準サービスエリア４の外へ移動したと判断し、隣接
する基地局２および３に対して移動局８から到達する入
力電界の報告（以下、電界検出信号とする）を要求する
。基地局２では、第２図のχ力レベル１２ヲ超えた入力
となシ２レベル情報ｔ３が電界検出信号として、また基
地局３では入力レベル１１よシ低い入力となることから
レベル情報ｔ１が制御局１２へ報告される。First, to explain the operation when using standard service areas 4, 5, and 6, the respective base stations 1, 2
and 3 is the input electric field level 11 to i4 received by the mobile station.
The level information t, to t5 shown in FIG. 13 is used as the position information of the mobile station to be sent to the control station. Now, when the mobile station 8 moves along the moving route 11i while continuing communication, the first boundary line 9a
(Point p2) When passing k, the input electric field at the base station 1 decreases from the human power level '1'2, and the base station 1 changes to the control station 1.
2, the level information t2 in FIG. 3 is sent. The control station 12 receives this as a signal in which the received input electric field of the base station 1 has deteriorated (hereinafter referred to as a level deterioration signal), and transmits it to the mobile station 8.
The mobile station 8 determines that the mobile station has moved outside the standard service area 4, and requests the adjacent base stations 2 and 3 to report the input electric field arriving from the mobile station 8 (hereinafter referred to as an electric field detection signal). In base station 2, level information t3 is used as an electric field detection signal when the input exceeds the χ power level 12 in FIG. It is reported to the control station 12.
制御局１２では、高位のレベル情報を送出した基地局、
すなわち、基地局２の標準サービスエリア５へ移動局８
が移動したと判足し、基地局２へ回線を切替え、移動局
８全追跡することによって通信の継続を維持する。移動
局８が境界１９ｂ（点ｐ７） ｆｔ通過し、標準サービ
スエリア６へ移動する場合も、同様に境界線９ｂ上で基
地局２がら基地局３へ回線の切替が行なわれる。In the control station 12, the base station that sent out the higher level information,
That is, the mobile station 8 goes to the standard service area 5 of the base station 2.
It is determined that the mobile station has moved, the line is switched to the base station 2, and communication is maintained by tracking all mobile stations 8. When the mobile station 8 passes through the boundary 19b (point p7) ft and moves to the standard service area 6, the line is similarly switched from the base station 2 to the base station 3 on the boundary line 9b.
次に、標準サービスエリア５に設計値を超える数の移動
局が集中し、一方、隣接のサービスエリアに設備の余裕
が生じた場合にとられる判断基準の変更動作について説
明する。まず、第３図のレベル情報ｔ１〜ｔ５に対する
判断基準を基地局２のレベル劣化信号及び電界検出信号
について入力レベル１１〜１４から人力レベルｉ３〜ｉ
６にそれぞれ引上げると。Next, a description will be given of an operation for changing the judgment criteria when a number of mobile stations exceeding the design value is concentrated in the standard service area 5, and on the other hand, there is surplus equipment in the adjacent service area. First, the judgment criteria for level information t1 to t5 in FIG. 3 are set from input levels 11 to 14 to human power levels i3 to i
If you raise each to 6.
基地局２が送出するレベル情報の・ぞターンは第３図の
レベル情報ノソターンＢからレベル情報ノやターンＢ′
に変わる。移動局８が移動経路１１上を進み境界点ｐ２
に到達したとき、基地局１からレベル劣化信号としてレ
ベル情報ｔ２が制御局１２へ送出される。基地局２では
レベル情報ノＪ？ターンＢ′へ変更されていることから
、電界検出信号としてレベル情報ｔ１ヲ送出する。した
がって、制御局１２は、移動局８を高位のレベル情報を
送出した基地局、すなわち基地局工と接続させ、−回線
の追跡切替は行なわれない０移動局８が境界点ｐ３を超
えると、基地局１はレベル情報ｔ、を、基地局２はレベ
ル情報ｔ２２へ
送出するから、基地局２Ｉｌｔｈ回線が切替えられ、移
動局８の追跡が行なわれる。移動局８が点ｐ５まで進む
と、基地局２はレベル劣化信号としてレベル情報ｔ２を
送出するが、他に高位のレベル情報を送出する基地局が
ないため回線の追跡切替は行なわれない。さらに進んで
、境界点ｐ６ｅ超えると。The level information turns sent by the base station 2 are from level information turn B to level information turn B' in FIG.
Changes to The mobile station 8 moves on the moving route 11 and reaches the boundary point p2.
When the level information t2 is reached, the base station 1 sends level information t2 to the control station 12 as a level degradation signal. Base station 2 has level information No.J? Since the turn has been changed to turn B', level information t1 is sent out as an electric field detection signal. Therefore, the control station 12 connects the mobile station 8 to the base station that sent the higher level information, that is, the base station engineer, and - Line tracking switching is not performed0 When the mobile station 8 crosses the boundary point p3, Since the base station 1 sends the level information t, and the base station 2 sends the level information t22, the base station 2Ilth line is switched and the mobile station 8 is tracked. When the mobile station 8 advances to point p5, the base station 2 sends level information t2 as a level degradation signal, but since there is no other base station that sends out higher level information, line tracking switching is not performed. If you go further and cross the boundary point p6e.
基地局３の電界検出信号が高位のレベル情報を送出する
ようになり、基地局２から基地局３へ回線１）３ 、ｐ
６において行なわれ、前述のように、レベル情報の判断
基準を引上げたことになる。回線切替を行なう地点が、
境界線９ａ ｌ ９ｂから境界線１０ ｍ−、，１０ｂ
に移動し、連続通話に利用できるサービスエリアは標準
サービスエリア５がら縮少サービスエリア７に縮少され
る。したがって、標準サービスエリアの周辺部に存在す
る通信中の移動局は隣接するサービスエリアへ分散され
、基地局２の負荷が軽減される。The electric field detection signal of base station 3 begins to send out high level information, and the line 1) 3, p from base station 2 to base station 3
6, and as mentioned above, the criteria for determining level information has been raised. The point where the line is switched is
From boundary line 9a l 9b to boundary line 10 m-,,10b
The service area available for continuous calls is reduced from standard service area 5 to reduced service area 7. Therefore, communicating mobile stations existing in the periphery of the standard service area are distributed to adjacent service areas, and the load on the base station 2 is reduced.
次に、制御局１２において、各々のサービスエリアに対
応する複数の基地局を統括するために。Next, the control station 12 controls a plurality of base stations corresponding to each service area.
レベル劣化信号の発生した基地局からのレベル情報と、
その隣接する基地局からのレベル情報とを各々のサービ
スエリアの回線の輻棲の度１．合・に応じて修正し、追
跡切替を制御する場合について説明する。第１図におい
て、移動局８がサービスエリア４から移動経路１１上を
サービスエリア５に進み、境界点ｐ２ ｋ通過した時、
基地局１からレベル劣化信号が制御局１２に送出される
。制御局１２では、基地局１および隣接する基地局にレ
ベル監視信号を送出し、各基地局からのレベル情報を比
較してそのレベルが最も高い基地局２へ回線の切替を行
なおうとする。そのとき基地局２が設計値で許容してい
る呼量に対して輻輪状態にあるとすれば、制御局１２は
基地局２からのレベル情報を一足値だけ減算して他のレ
ベル情報と比較する。Level information from the base station where the level degradation signal occurred,
The level information from the adjacent base stations is calculated based on the congestion level of the lines in each service area. A case will be described in which the tracking switching is controlled by modifying the tracking according to the situation. In FIG. 1, when the mobile station 8 advances from the service area 4 on the moving route 11 to the service area 5 and passes the boundary point p2k,
A level degradation signal is sent from the base station 1 to the control station 12. The control station 12 sends a level monitoring signal to the base station 1 and adjacent base stations, compares the level information from each base station, and attempts to switch the line to the base station 2 with the highest level. At that time, if the base station 2 is in a congested state with respect to the traffic volume allowed by the design value, the control station 12 subtracts the level information from the base station 2 by one value and compares it with other level information. compare.
その結果１回線の追跡切替が基地局１から基地局２へ実
施される確率を下げ、他の基地局への切替か又は切替中
止の確率を上げる。逆に、基地局１が輻棲状態にあシ、
基地局２の設備に余裕がある場合には、制御局１２は基
地局１からのレベル情報を一定値だけ減算して他のレベ
ル情報と比較する。その結果２回線の追跡切替が基地局
１から基地局２．又は他の基地局へ実施される確率を上
げて、切替中止の確率を下げることになり、前述の基地
局側圧おける入力電界レベルの判断基準の操作と同等の
効果を上げることができる０なお、上記の実施例におい
ては、レベル情報に対する判断基準を引上げることによ
って標準サービスエリア５を縮少するように説明したが
１反対に判定基準を引下げることによって、標準サービ
スエリア５を拡大することも可能である。追跡切替を行
なう地点の変更によるサービスエリアの広さの制御は、
制御局１２の制御範囲にある全基地局に及ぶ。これによ
って１発生した呼量が設備容量の設計値を超えたサービ
スエリアに対して移動周上の接続を隣接するサービスエ
リアに分散するように、各基地局の入力電界値の判断基
準を変更することができる。勿論各基他局における入力
電界の判断基準の段階の選定と、対象とする信号及び適
用するサービスエリアの組合せに限定はない。As a result, the probability that tracking switching of one line will be performed from base station 1 to base station 2 is lowered, and the probability of switching to another base station or switching cancellation is increased. Conversely, if base station 1 is in a congestion state,
If the base station 2 has sufficient equipment, the control station 12 subtracts a certain value from the level information from the base station 1 and compares it with other level information. As a result, tracking switching of two lines is performed from base station 1 to base station 2. Alternatively, it increases the probability that switching will be carried out to other base stations, and lowers the probability that switching will be canceled, which can achieve the same effect as the operation of the criterion for determining the input electric field level in the base station side pressure described above. In the above embodiment, it was explained that the standard service area 5 is reduced by raising the criteria for level information, but on the contrary, the standard service area 5 can also be expanded by lowering the criteria. It is possible. To control the size of the service area by changing the point where tracking is switched,
This applies to all base stations within the control range of the control station 12. As a result, the criteria for determining the input electric field value of each base station will be changed so that connections on the moving circuit are distributed to adjacent service areas for service areas where the call volume exceeds the design value of the installed capacity. be able to. Of course, there is no limit to the selection of the stage of the input electric field judgment criteria at each base station, and the combination of target signals and applicable service areas.
又、ある基地局が輻棲状態にある時だけ前記制御を行う
のでなく、常時全基地局の回線使用率が等しくなるよう
に制御することによシ、全基地局の接続率を同じにする
こともできる。Furthermore, instead of performing the above control only when a certain base station is in a congested state, the connection rate of all base stations can be made the same by controlling the line usage rates of all base stations to be equal at all times. You can also do that.
以上の説明によシ明らかなように２本発明によれば、隣
接基地局間の設備の使用に対し相互に融通性をもたせる
ことができるから９時々刻々変化する移動局の呼量に対
してシステムが柔軟に対応でき、全体としてチャネルの
接続率及び設備の利用率が高められることは勿論、接続
率を一足にすれば、従来よシ少ない設備でシステムの運
用が可能となり、経済的に得られる効果もまた大である
。As is clear from the above explanation, according to the present invention, it is possible to provide mutual flexibility in the use of equipment between adjacent base stations. Of course, the system can be flexibly adapted and the overall channel connection rate and equipment utilization rate can be increased, but if the connection rate is reduced, the system can be operated with less equipment than before, which is economically advantageous. The effect is also great.
第１図は本発明による実施例を説西するための部分的な
システム系統図、第２図は第１図における移動局位置と
基地局入力電界の関係を示すグラフ、第３図は、第１図
における移動局位置と基地局が送出するレベル情報の関
係を示すグラフである。
図において、１〜３は基地局、４〜６は標準サービスエ
リア、７は縮少サービスエリア、８は移動局、９ａ、９
ｂ、１０ａ、１０ｂは境界線。
１１は移動経路、１２は制御局である。FIG. 1 is a partial system diagram for explaining an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the mobile station position and base station input electric field in FIG. 1, and FIG. 2 is a graph showing the relationship between the mobile station position in FIG. 1 and the level information sent by the base station. In the figure, 1 to 3 are base stations, 4 to 6 are standard service areas, 7 is a reduced service area, 8 is a mobile station, 9a, 9
b, 10a, and 10b are the boundaries. 11 is a moving route, and 12 is a control station.
Claims (1)
する複数のサービスエリアと、これ等サービスエリアの
それぞれに対応して配された複数の基地局と、辷れ等複
数の基地局を統括する制御局と、前記複数のサービスエ
リアを移動する複数の移動局とによ多構成され、前記移
動局から基地局に到達する入力電界値が予め決められた
判断基準以上の時のみ、該移動局と結ばれる回線を基地
局間で引き継ぐようにした移動無線通信方式において、
前記制御局、前記移動局に接続中の基地局および該基地
局に隣接する基地局のうちのいずれかの局が該当する基
地局の入力電界情報に対する判断基準を変更することに
よって、前記回線の引き継ぎを行うサービスエリアの切
替地点を変えるべく制御するようにしたことを特徴とす
る移動無線通信方式。1. Multiple service areas that are adjacent to each other and each has a pre-assigned wandering area, multiple base stations arranged corresponding to each of these service areas, and multiple base stations that are intersected. It is composed of a supervising control station and a plurality of mobile stations moving in the plurality of service areas, and only when the input electric field value reaching the base station from the mobile station is equal to or higher than a predetermined criterion, In a mobile radio communication system in which the line connected to a mobile station is taken over between base stations,
The control station, the base station connected to the mobile station, and the base station adjacent to the base station change the criteria for the input electric field information of the base station, so that the line A mobile radio communication system characterized in that control is performed to change a switching point of a service area for handover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56209028A JPS58111443A (en) | 1981-12-25 | 1981-12-25 | Mobile radio communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56209028A JPS58111443A (en) | 1981-12-25 | 1981-12-25 | Mobile radio communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58111443A true JPS58111443A (en) | 1983-07-02 |
Family
ID=16566061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56209028A Pending JPS58111443A (en) | 1981-12-25 | 1981-12-25 | Mobile radio communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58111443A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6130138A (en) * | 1984-07-20 | 1986-02-12 | Nippon Telegr & Teleph Corp <Ntt> | Mobile radio channel switching method |
| JPS6468138A (en) * | 1987-09-09 | 1989-03-14 | Nippon Telegraph & Telephone | Traffic control method in mobile communication |
| JPH0269027A (en) * | 1988-09-05 | 1990-03-08 | Nippon Telegr & Teleph Corp <Ntt> | System for controlling speech channel of mobile communication |
| JPH03205928A (en) * | 1989-05-03 | 1991-09-09 | British Telecommun Plc <Bt> | Vehicle communication system |
| US5455967A (en) * | 1993-03-18 | 1995-10-03 | Oki Electric Industry Co., Ltd. | Mobile communication system and transmission power control method for a base station therein |
| USRE36017E (en) * | 1988-02-29 | 1998-12-29 | Telefonaktiebolaget Lm Ericsson | Cellular digital mobile radio system and method of transmitting information in a digital cellular mobile radio system |
| USRE36079E (en) * | 1988-06-14 | 1999-02-02 | Telefonaktiebolaget Lm Ericsson | Handover method for mobile radio system |
| JP2009017577A (en) * | 1998-11-05 | 2009-01-22 | Lucent Technol Inc | Dynamic reduction of telephone call congestion |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138803A (en) * | 1976-02-04 | 1977-11-19 | Nippon Telegr & Teleph Corp <Ntt> | Selection of speech channel change-over destination in speech channel change-over |
-
1981
- 1981-12-25 JP JP56209028A patent/JPS58111443A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138803A (en) * | 1976-02-04 | 1977-11-19 | Nippon Telegr & Teleph Corp <Ntt> | Selection of speech channel change-over destination in speech channel change-over |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6130138A (en) * | 1984-07-20 | 1986-02-12 | Nippon Telegr & Teleph Corp <Ntt> | Mobile radio channel switching method |
| JPS6468138A (en) * | 1987-09-09 | 1989-03-14 | Nippon Telegraph & Telephone | Traffic control method in mobile communication |
| USRE36017E (en) * | 1988-02-29 | 1998-12-29 | Telefonaktiebolaget Lm Ericsson | Cellular digital mobile radio system and method of transmitting information in a digital cellular mobile radio system |
| USRE37685E1 (en) | 1988-06-14 | 2002-04-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover method for mobile radio system |
| USRE36079E (en) * | 1988-06-14 | 1999-02-02 | Telefonaktiebolaget Lm Ericsson | Handover method for mobile radio system |
| USRE36078E (en) * | 1988-06-14 | 1999-02-02 | Telefonaktiebolaget Lm Ericsson | Handover method for mobile radio system |
| USRE37787E1 (en) | 1988-06-14 | 2002-07-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Handover method for mobile radio system |
| JPH0269027A (en) * | 1988-09-05 | 1990-03-08 | Nippon Telegr & Teleph Corp <Ntt> | System for controlling speech channel of mobile communication |
| JP2517697B2 (en) * | 1989-05-03 | 1996-07-24 | ブリテイッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | Mobile communication system |
| JPH03205928A (en) * | 1989-05-03 | 1991-09-09 | British Telecommun Plc <Bt> | Vehicle communication system |
| US5455967A (en) * | 1993-03-18 | 1995-10-03 | Oki Electric Industry Co., Ltd. | Mobile communication system and transmission power control method for a base station therein |
| JP2009017577A (en) * | 1998-11-05 | 2009-01-22 | Lucent Technol Inc | Dynamic reduction of telephone call congestion |
| JP4584327B2 (en) * | 1998-11-05 | 2010-11-17 | アルカテル−ルーセント ユーエスエー インコーポレーテッド | Dynamic reduction of telephone call congestion |
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