JPS6282731A - Mobile communication system - Google Patents

Mobile communication system

Info

Publication number
JPS6282731A
JPS6282731A JP60221904A JP22190485A JPS6282731A JP S6282731 A JPS6282731 A JP S6282731A JP 60221904 A JP60221904 A JP 60221904A JP 22190485 A JP22190485 A JP 22190485A JP S6282731 A JPS6282731 A JP S6282731A
Authority
JP
Japan
Prior art keywords
transmission power
mbs
mss
communication
base station
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
Application number
JP60221904A
Other languages
Japanese (ja)
Inventor
Atsushi Tajima
淳 田島
Hiroshi Inaba
洋 稲葉
Kenji Imamura
賢治 今村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP60221904A priority Critical patent/JPS6282731A/en
Publication of JPS6282731A publication Critical patent/JPS6282731A/en
Pending legal-status Critical Current

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  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To attain communication with high quality similarly as an MSS having a large transmission power even in an MSS having a small transmission power by installing plural slave base stations with small transmission power in an area in service of a main radio base station of a large transmission power. CONSTITUTION:A communication line between the main radio base station MBS and a mobile communication exchange station AMS is the same form as that of a conventional system, but a part (or all) of them is connected with a slave radio base station PRS and a mobile station MSS 27 with a large transmission power communicates with an MBS 15 only. On the other hand, an MSS 28 of a small transmission power selects a nearby PRS among PRSes 17-21 to apply communication. However, the MSS 28 with small transmission power located near the MBS 15 makes communication while the transmission power of the MBS 15 is reduced from the maximum value. Since the MSS 28 with a small transmission power always makes communication with a PRS (or MBS) located in the vicinity, excellent communication is ensured even with a small transmission power.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、一つのサービスエリア内に大きな送信電力を
有する移動局と、該移動局に比べて小さな送信電力を有
する移動局との複数の移動局が存在する場合に有効な移
動通信方式に関するものである。
Detailed Description of the Invention [Field of Industrial Application] The present invention provides a mobile station with a large transmission power within one service area and a plurality of mobile stations with a smaller transmission power than the mobile station. The present invention relates to a mobile communication system that is effective when a mobile station is present.

〔従来の技術〕[Conventional technology]

従来の移動通信システムの最も基本的なW成を第1図に
示す。
FIG. 1 shows the most basic W configuration of a conventional mobile communication system.

第1図において、1〜5は移動局と対向して電波の送受
信を行なう無線基地局、6〜10はそれぞれ無線基地局
1〜5がサービスを提供するサービスエリアの境界を示
す、無線基地局1〜5の送信電力最大値はすべで等しい
。また、11.12.13は移動局(以下MSSともい
う)であり、これらの送信電力最大値もすべて等しい。
In FIG. 1, reference numerals 1 to 5 are wireless base stations that face mobile stations and transmit and receive radio waves, and 6 to 10 are wireless base stations that indicate boundaries of service areas provided by the wireless base stations 1 to 5, respectively. The maximum transmission power values of 1 to 5 are all equal. Further, 11, 12, and 13 are mobile stations (hereinafter also referred to as MSS), and their maximum transmission power values are all the same.

14は移動通信交換局であり、無線基地局からの通話回
線は該移動通信交換局14を経由して一般網と接続され
る。
14 is a mobile communications switching center, and the telephone line from the radio base station is connected to the general network via the mobile communications switching center 14.

fIS1図のMSS11〜13は最寄りの無線基地局を
選択して通信を行なう。移動局が他のサービスエリアに
移行した場合、通話中チャネル切替技術により新しく選
択された無線基地局と通信を継続することが可能である
The MSSs 11 to 13 in the fIS1 diagram select the nearest radio base station and perform communication. When a mobile station moves to another service area, it is possible to continue communicating with a newly selected radio base station using mid-call channel switching technology.

またMSSと無線基地局は、両者間の距離や伝搬特性に
応じて、随時、相互の送信電力を変化させることが可能
である (但し、最大の送信電力はハードウェア上の理
由及び回線設計上の理由により制限がある)。
Additionally, the MSS and wireless base station can change their mutual transmission power at any time depending on the distance and propagation characteristics between them (however, the maximum transmission power may vary due to hardware reasons and line design). (There are restrictions due to reasons.)

以上、説明したような従来の数多くの、かつ最も基本的
な移動通信サービスでは、主として回線設計上の理由に
より、最大送信電力に関して移動局(M S S )は
1種類であった。
In the many conventional and most basic mobile communication services as described above, there is only one type of mobile station (MSS) with respect to maximum transmission power, mainly due to line design reasons.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

一方、サービス面から移動通信方式をとらえると、例え
ば自動車電話の場合、車両に固定的に設けた比較的送信
電力の大きい移動局の他に、自動率から降りた後に携帯
用としても使用できるような小形の移動局があれば便利
である。このような移動局(MSS)の体積は小さく、
電源として用いる電池の寿命や、充電式のバッテリーの
充電周期は長い方が好ましい、そのためには、送信電力
の低減を図り消費電力を減らすのが有効である。
On the other hand, if we look at mobile communication systems from a service perspective, for example, in the case of car telephones, in addition to mobile stations fixedly installed in the vehicle with relatively high transmission power, there are also mobile stations that can be used as portable devices after getting off the automatic service system. It would be convenient to have a small mobile station. The volume of such a mobile station (MSS) is small,
It is preferable that the life of a battery used as a power source and the charging cycle of a rechargeable battery be long, and for this purpose, it is effective to reduce power consumption by reducing transmission power.

最近の移動通信システムでは、このようなM−8S小形
化の要求により、大きな送信電力を有するMSSに混在
して、小送信電力のMSSのサービスも行なわれている
。この場合、制御装置をできるだけ共用して経済化を図
る目的で無線基地局および移動通信交換局(以下、AM
Sともいう)は大送信電力MSS用の無線基地局やAM
S等をそのまま利用しているため、回胤設計上の問題点
、すなわち、MSS送信・無線基地局受信の電波の強度
が弱く、ビルの陰等ですぐに通話が断になるという問題
点を生じていた。
In recent mobile communication systems, due to the demand for miniaturization of M-8S, MSSs with small transmission power are being provided together with MSSs with large transmission power. In this case, in order to save money by sharing control equipment as much as possible, wireless base stations and mobile communication switching centers (hereinafter referred to as AM
S) is a radio base station for high transmission power MSS or AM
Because it uses S, etc. as is, it solves the problem of the circulation design, namely, the strength of the radio waves for MSS transmission and wireless base station reception is weak, and calls are easily disconnected behind buildings etc. It was happening.

〔発明の目的〕[Purpose of the invention]

本発明はこのような問題点を除去するため、大送信電力
の主無線基地局がサービスするエリア内に複数の小送信
電力の従基地局を設置することにより、送信電力の小さ
いMSSでも送信電力の大きいMSSと同様に高品質な
通信を可能とする移動通信システムを提供することを目
的としている。
In order to eliminate such problems, the present invention installs a plurality of slave base stations with low transmission power within the area serviced by the main radio base station with high transmission power, thereby reducing the transmission power even for MSS with low transmission power. The purpose of the present invention is to provide a mobile communication system that enables high-quality communication similar to that of MSS with a large amount of data.

以下、本発明の構成等に関し実施例の図面に基づいて説
明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained below based on drawings of embodiments.

〔実施例〕〔Example〕

第2図は本発明の一実施例の移動通信システムの構成を
示す図であって、14は移動通信交換局(以下AMSと
もいう)、15は主無線基地局(以下MBSともいう)
、16は主無線基地局15のサービスエリア、17〜2
1は従無線基地局(以下PR8ともいう)、22〜26
はそれぞれ従無線基地局17〜21に対応するサービス
エリア、27は大送信電力を有するMSS、28は小送
信電力のMSSを表わしている。
FIG. 2 is a diagram showing the configuration of a mobile communication system according to an embodiment of the present invention, in which 14 is a mobile communication switching center (hereinafter also referred to as AMS), and 15 is a main radio base station (hereinafter also referred to as MBS).
, 16 is the service area of the main wireless base station 15, 17-2
1 is a slave radio base station (hereinafter also referred to as PR8), 22 to 26
are service areas corresponding to the slave radio base stations 17 to 21, 27 is an MSS with large transmission power, and 28 is an MSS with small transmission power.

tIS2図において、MBS−AMS間の通信回線は従
来と同様の形態であるが、そのうちの一部(または全部
)はPH1と接続可能である。
In the tIS2 diagram, the communication line between MBS and AMS has the same form as the conventional one, but some (or all) of them can be connected to PH1.

大送信電力のMSS27はMBS15とのみ通信を行な
う。
The MSS 27 with high transmission power communicates only with the MBS 15.

一方、小送信電力のMSS28はPR817〜21のう
ち最寄りのPH1を選んで通信を行なう、ただしMBS
15の近くに位置する小送信電力のMS328はMBS
15の送信電力を最大値より落とした状態で通信可能で
ある。小送信電力のMS828は常に近くに位置するP
H1(またはMBS)と通信を行なうから送信電力が小
さくても良好な通信を確保することができる。
On the other hand, MSS28 with low transmission power selects the nearest PH1 from PR817 to PR817 to communicate.
MS328 with small transmit power located near 15 is MBS
Communication is possible with the transmission power of 15 lower than the maximum value. MS828 with small transmission power is always located nearby P
Since communication is performed with H1 (or MBS), good communication can be ensured even if the transmission power is low.

PR817〜21のサービスエリア22〜26を小送信
電力のMS828が横切った場合は、大送信電力のMS
S27がMBSサービスエリア16を横切った場合と同
様の制御手順により通話中チャネル切替が可能である。
If MS828 with low transmission power crosses service areas 22 to 26 of PR817 to 21, MS828 with high transmission power
Channel switching during a call is possible using the same control procedure as when S27 crosses the MBS service area 16.

MBS、PH1のさらに詳細なハードウェア構成と相互
の関連を13図に示す。
FIG. 13 shows a more detailed hardware configuration and mutual relationship of the MBS and PH1.

第3図において、29はMBSの制御装置(以下、MB
S−CONTともいう)、30,31はPH1の制御装
置(以下PR8−CONTともいう)であって、30は
一方のPH1(PH10と呼ぶ)、31は他方のPH1
(PH10と呼りの制御装置である。32はMBSに設
置された時分割形スイッチ(以下TDSWともいう)、
33はMBSに設置された送受信機、34.35はそれ
ぞれPH11および2に設置された送受信機(以下送受
信機をTRXともいう)、36はAMS−MBS開の通
話回線、37はM B SのTRXとTDSW間の通話
回線、38.39はそれぞれTDSWとPH11,2間
の通話回線である。MBS−CONT29はT D S
 WやTRX33およびその他のMBS装置の制御を行
なう、PH1−CONTはMBS−CONT29と連携
してPH1のTRXやその他のPR6内装置の制御を行
なう、TDSW32は回線束36の中の任意の回線(タ
イムスロット)とMBSおよびPH1に設置された任意
のVTRXとを接続可能にするためのスイッチである。
In FIG. 3, 29 is an MBS control device (hereinafter referred to as MB
(also referred to as S-CONT), 30 and 31 are control devices for the PH1 (hereinafter also referred to as PR8-CONT), 30 is one PH1 (hereinafter referred to as PH10), and 31 is the other PH1
(This is a control device called PH10. 32 is a time division switch (hereinafter also referred to as TDSW) installed in the MBS,
33 is the transmitter/receiver installed in MBS, 34.35 is the transmitter/receiver installed in PH11 and PH2 (hereinafter, the transmitter/receiver is also referred to as TRX), 36 is the AMS-MBS open communication line, 37 is the MBS's Call lines 38 and 39 between TRX and TDSW are call lines between TDSW and PH11 and 2, respectively. MBS-CONT29 is TDS
The PH1-CONT controls the TRX of the PH1 and other devices in the PR6 in cooperation with the MBS-CONT29.The TDSW32 controls any line in the line bundle 36 ( This is a switch that enables connection between the time slot) and any VTRX installed in the MBS and PH1.

このスイッチは、空間公開形スイッチとすることも可能
である。VTRX34.35からの回線38.39をこ
の図のようにTDSWを介してAMSに接続することに
よりVTRX33.34.35からAMSの開で交換機
能をもたせ、直接AMSに引き込まないのは以下の理由
による。
This switch can also be a space open type switch. The reason why the line 38.39 from VTRX34.35 is connected to AMS via TDSW as shown in this diagram allows switching function to be provided by opening AMS from VTRX33.34.35, but not directly connected to AMS. by.

■ 回線36が回#I37.38.39各々よりも大束
となり、回[37,38,39の回線数の合計上り回#
136の所要回線数を削減できる。
■ Line 36 becomes a larger bundle than line #I37, 38, and 39, and line [total uplink number of lines 37, 38, and 39
136 required lines can be reduced.

■ PH1での無IIA回線割り当て制御は一括してM
BS内で行なわれることになり、MBSより上位の局へ
の制御上の影響が少ない。
■ Non-IIA line allocation control in PH1 is performed by M
This is done within the BS, so there is little influence on control on stations higher up than the MBS.

以上、システム構成とハードウェア構成について述べた
The above describes the system configuration and hardware configuration.

移動通信における今一つの重要な課題は周波数の有効利
用である。TRX33.34.35への周波数割り当て
については、以下の3つの方法がある。
Another important issue in mobile communications is the effective use of frequencies. There are the following three methods for frequency allocation to TRX33.34.35.

■ MBSおよび各PRSで使用する周波数はすべて個
別とする。
■ All frequencies used by MBS and each PRS shall be separate.

■ 各PH1間の周波数は異なるが、その一部または全
部をMBSの周波数と共用する。
- The frequency between each PH1 is different, but part or all of it is shared with the MBS frequency.

■ MBS、各PH1間で一部または全部の周波数を共
用する。
■ Share some or all frequencies between MBS and each PH1.

これらの3つの方法の優劣はトラヒック量とTRXコス
トにより変わるが、第3図の構成では上記■〜■のどれ
を採用してもMBSより上位局に影響を与えることなく
周波数割り当て制御が可能である。
The merits and demerits of these three methods vary depending on the traffic volume and TRX cost, but in the configuration shown in Figure 3, frequency allocation control can be performed without affecting higher-level stations than MBS, regardless of which of the above ■~■ is adopted. be.

以上、説明したよ)に本発明は、移動通信システム内の
通イgの制御を統一的に行なっているものであって、そ
の重要な点は、大送信電力MSSに対しても小送信電力
へ1SSに対してもMBS装置の一部(TDSW)が共
用されている、i< Cある。これは、M B Sのン
7トウェ7も一部共用されていることを意味する。この
ような構成をとることにより、装置およびソフトウェア
の共用による経済化を図ることができる。
As explained above, the present invention performs unified control of communication in a mobile communication system, and the important point is that even for large transmission power MSS, small transmission power A part of the MBS device (TDSW) is also shared by the 1SS, i<C. This means that a portion of the MBS's 7-way 7 is also shared. By adopting such a configuration, it is possible to achieve economy by sharing devices and software.

以上のような共用化は、第4図に示すように多(の装置
またはソフトウェアで配慮することが可能である。
The above-mentioned sharing can be achieved using multiple devices or software as shown in FIG.

Pt54図において、40はMSS、41はMBS14
2は回線制御PJ(以下MC3ともいう)、43はAM
S、−14はMSS−MBS間制御チャネル、45はM
SS−MBS間通話チャネル、46はMBS−MCS間
制御チャネル、47はMBS−MC8間通話チャネル、
48はMC3〜AMS間制御チャネル、49はMC8−
AMS開通話チャネル、50は固定通信網、51はPR
8It表わしている。
In the Pt54 diagram, 40 is MSS, 41 is MBS14
2 is line control PJ (hereinafter also referred to as MC3), 43 is AM
S, -14 is the MSS-MBS control channel, 45 is M
SS-MBS communication channel, 46 is MBS-MCS control channel, 47 is MBS-MC8 communication channel,
48 is a control channel between MC3 and AMS, 49 is MC8-
AMS opening channel, 50 is fixed communication network, 51 is PR
It represents 8It.

第4図に示した装置等の共用可能なものとしては以下の
ものがある。
The devices shown in FIG. 4 that can be shared include the following.

■MBS 41、MC342、AMS 43、制御チャ
ネル44.46.48および通話チャネル45.47.
49のハードウェアの一部または全部。
■MBS 41, MC342, AMS 43, control channel 44.46.48 and speech channel 45.47.
Some or all of the 49 hardware.

■ MBS 41、MC842、AMS 43の動作に
必要なソフトウェアの一部または全部。
■ Part or all of the software necessary for the operation of MBS 41, MC842, and AMS 43.

■ 通信の接続に必要な加入者を特定する番号(いわゆ
る電話番号で、これは、固定通信網50の中の交換系装
置および伝送路の一部を共用することを意味する)。
(2) A number that identifies a subscriber necessary for communication connection (a so-called telephone number, which means that a part of the switching equipment and transmission path in the fixed communication network 50 is shared).

以上■、■、■の共用により、統一的な制御機構により
装置の経済的な実現を図ることができる。第4図以外の
システム構成(たとえばMC8が存在しない構成等)に
おいても、以上と同様の装置共用ができることは明らか
である。
By sharing (1), (2), and (3) above, it is possible to realize an economical apparatus through a unified control mechanism. It is clear that the same device sharing as described above can be performed even in system configurations other than those shown in FIG. 4 (for example, a configuration in which the MC 8 does not exist).

なお、以上の実施例に関する説明においては主としてM
SSが2種類存在する場合についで説明しているが、本
発明はMSSが3種類以上存在する場合であっても同様
の考え方が適用できるものである。
In addition, in the explanation regarding the above embodiment, mainly M
Although the case where there are two types of SS is explained below, the same concept can be applied to the present invention even when there are three or more types of MSS.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明の方式によれば大送信電力
MSSと小送信電力MSSが混在する移動通信システム
において、それぞれに対応して大送信電力の主基地局と
小送信電力の従基地局とを設置したことにより、送信電
力の異なる複数の移動局に対して良好な通信品質のサー
ビスを提供することがで慇る。
As explained above, according to the method of the present invention, in a mobile communication system where large transmission power MSS and small transmission power MSS coexist, a main base station with large transmission power and a slave base station with small transmission power correspond to each other. By installing this, it is possible to provide services with good communication quality to a plurality of mobile stations with different transmission powers.

また、本発明は装置の一部を共用しているので、システ
ムの経済的な実現が可能であるという利点を有する。
Furthermore, since a part of the apparatus is shared, the present invention has the advantage that the system can be realized economically.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来の移動通信システムの構成を示す図、MS
2図は本発明の一実施例の移動通信システムの構成を示
す図、第3図は本発明に係るMBSとPH1のハードウ
ェア構成を示す図、第4図は移動通信システムを構成す
る装置のハードウェアまたはソフトウェアの共用方法を
示す図である。 1〜5 ・・・・・・無線基地局、6〜10 ・・・・
・・サービスエリアの境界、11〜13 ・・・・・・
移動局、14.43  ・・・・・・移動通信交換局、
  15 。 41・・・・・・主無線基地局、 16 ・・・・・・
主無線基地局のサービスエリア、  17〜21.51
・・・・・・従無線基地局、 22〜26 ・・・・・
・従無線基地局のサービスエリア、  27 ・・・・
・・大送信電力のMSS、28  ・・・・・・小送信
電力のMSS。 29 ・・・・・・MBSの制御装置、30,31  
・・・・・・PH1の制御装置、 32 ・・・・・・
時分割形スイッチ、  33 ・・・・・・MBSに設
置された送受信機、34  、35  ・・・・・・ 
PH1に設置された送受信機、  36 ・・・・・・
AMS−MBS間の通話回線、37 ・・・・・・MB
SのTRXとTDSW間の通話回線、 38  、39
  ・・・・・・ TDSWとPH11,2間の通話回
線、 40 ・・・・・・MSS。 42 ・・・・・・回線制御局、  44 ・・・・−
MSS〜MBS間制御チャネル、45 ・・・・・・M
S 5−MB5閏通話チャネル、46 ・・・・・・ 
MBS−MC8間制御チャネル、 47 ・・・・・・
 MBS−MC8間通話チャネル、 48 ・・・・・
・ MC8−AMS間制御チャネル、 49 ・・・・
・・ MC8−AMS間通話チャネル、 50 ・・・
・・・固定通信網代理人 弁理士  本  間    
 崇茅!図 第2 回
Figure 1 is a diagram showing the configuration of a conventional mobile communication system.
FIG. 2 is a diagram showing the configuration of a mobile communication system according to an embodiment of the present invention, FIG. 3 is a diagram showing the hardware configuration of the MBS and PH1 according to the present invention, and FIG. 4 is a diagram showing the hardware configuration of the mobile communication system. FIG. 2 is a diagram illustrating a method for sharing hardware or software. 1-5... Wireless base station, 6-10...
... Service area boundaries, 11-13 ...
Mobile station, 14.43... Mobile communications switching center,
15. 41... Main wireless base station, 16...
Main wireless base station service area, 17-21.51
...Subordinate radio base station, 22-26 ...
・Service area of slave wireless base station, 27...
...MSS with large transmission power, 28 ...MSS with small transmission power. 29...MBS control device, 30, 31
・・・・・・PH1 control device, 32 ・・・・・・
Time division switch, 33... Transmitter/receiver installed in MBS, 34, 35...
Transmitter/receiver installed at PH1, 36...
Call line between AMS and MBS, 37...MB
Call line between S TRX and TDSW, 38, 39
・・・・・・Telephone line between TDSW and PH11,2, 40 ・・・・・・MSS. 42... Line control station, 44...-
MSS-MBS control channel, 45...M
S5-MB5 Leap Channel, 46...
MBS-MC8 control channel, 47...
MBS-MC8 communication channel, 48...
・MC8-AMS control channel, 49...
・・MC8-AMS communication channel, 50 ・・
...Fixed communication network agent Patent attorney Honma
Worshipful! Figure 2nd

Claims (1)

【特許請求の範囲】[Claims] 送信電力の異なる複数種類の移動局の使用を可とする移
動通信システムであって、主無線基地局と、該主無線基
地局より小なる送信電力を有し該主無線基地局のサービ
スエリア内にサービスエリアが存在する複数の従無線基
地局を設け、複数種類の移動局の内、送信電力の大なる
移動局が主無線基地局と接続して通信を行ない、送信電
力の小なる移動局が従無線基地局と接続して通信を行な
うことを特徴とする移動通信方式。
A mobile communication system that allows the use of multiple types of mobile stations with different transmission powers, including a main radio base station and a mobile station that has a lower transmission power than the main radio base station and is within the service area of the main radio base station. A plurality of slave radio base stations are provided, each having a service area in A mobile communication system in which a mobile station connects to a slave wireless base station and performs communication.
JP60221904A 1985-10-07 1985-10-07 Mobile communication system Pending JPS6282731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60221904A JPS6282731A (en) 1985-10-07 1985-10-07 Mobile communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60221904A JPS6282731A (en) 1985-10-07 1985-10-07 Mobile communication system

Publications (1)

Publication Number Publication Date
JPS6282731A true JPS6282731A (en) 1987-04-16

Family

ID=16773978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60221904A Pending JPS6282731A (en) 1985-10-07 1985-10-07 Mobile communication system

Country Status (1)

Country Link
JP (1) JPS6282731A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63316527A (en) * 1987-06-19 1988-12-23 Nippon Telegr & Teleph Corp <Ntt> Method for constituting zone
US6415161B1 (en) 1998-09-11 2002-07-02 Nec Corporation Mobile communication system with transmitting systems with different outputting power

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63316527A (en) * 1987-06-19 1988-12-23 Nippon Telegr & Teleph Corp <Ntt> Method for constituting zone
US6415161B1 (en) 1998-09-11 2002-07-02 Nec Corporation Mobile communication system with transmitting systems with different outputting power

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