JPH0332119A - Mobile communication base station - Google Patents
Mobile communication base stationInfo
- Publication number
- JPH0332119A JPH0332119A JP1167552A JP16755289A JPH0332119A JP H0332119 A JPH0332119 A JP H0332119A JP 1167552 A JP1167552 A JP 1167552A JP 16755289 A JP16755289 A JP 16755289A JP H0332119 A JPH0332119 A JP H0332119A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- antenna
- reception
- directivity
- mobile communication
- 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
- 238000010295 mobile communication Methods 0.000 title claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動車電話システムなどの移動通信基地局に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile communication base station such as a car telephone system.
従来の移動通信システムは自動車電話システムに代表さ
れるように自動車に積載された移動端末に対してサービ
スを提供することを中心に発展してきた。しかしながら
、近年、携帯端末が急速に普及し始め、車載端末よりも
送信電力の小さい携帯端末に対するサービスの提供が大
きな問題となっている。Conventional mobile communication systems have developed around providing services to mobile terminals mounted on cars, as typified by car telephone systems. However, in recent years, mobile terminals have begun to spread rapidly, and providing services to mobile terminals with lower transmission power than in-vehicle terminals has become a major problem.
車載端末と携帯端末の最大の違いは送信電力の違いであ
る。すなわち、送信電力の小さな携帯端末は通信範囲が
小さくなるため、サービスエリアを十分にカバーできな
くなってしまうという問題点がある。The biggest difference between in-vehicle terminals and mobile terminals is the difference in transmission power. That is, since a mobile terminal with low transmission power has a small communication range, there is a problem that the service area cannot be sufficiently covered.
送信電力の小さい携帯端末に対してサービスを提供する
方法として最も普通の方法は基地局数を大幅に増大し基
地局と端末との距離を縮小することである。この方法は
マイクロセルシステムとして、昭和６３年電子情報通信
学会の春季全国大会で「大容量移動通信システムへのア
プローチ」という論文で既に提案されている（講演番号
ＳＢ −６−９〉。The most common method for providing services to mobile terminals with low transmission power is to significantly increase the number of base stations and reduce the distance between the base stations and the terminals. This method has already been proposed as a microcell system in a paper titled ``An Approach to Large-Capacity Mobile Communication Systems'' at the Spring National Conference of the Institute of Electronics, Information and Communication Engineers in 1988 (Lecture No. SB-6-9).
また、送信電力の少ない端末に対してサービスを提供す
る方法として最も有力なのは基地局のアンテナの利得を
高める方法である。この方法はセフタアンテナの導入と
いう形で一部の自動車電話システムには既に導入されて
いる。例えば、英国の自動車電話では基地局にビーム幅
が６０度の指向性アンテナを用いている。このシステム
では送信、受信とも指向性アンテナを用いているため、
各アンテナはそれぞれ別の基地局を構成するものとして
取り扱われ、端末が基地局からみて異なった方向へ移動
するとハンドオフと呼ばれる通話中チャネル切り替えの
処理が必要となる。Furthermore, the most effective method for providing services to terminals with low transmission power is to increase the gain of the base station antenna. This method has already been implemented in some car phone systems in the form of a sefter antenna. For example, British car telephones use a directional antenna with a beam width of 60 degrees at their base station. This system uses directional antennas for both transmission and reception, so
Each antenna is treated as one that constitutes a separate base station, and when a terminal moves in a different direction from the base station, it is necessary to perform channel switching during a call called handoff.
上述したマイクロセルシステムをとる場合、基地局数が
大幅に増大するため、加入者の多い都市部では実現性が
あるが加入者数の少ない郊外ではコスト高になって実現
性がうすい。When adopting the above-mentioned microcell system, the number of base stations increases significantly, so it is feasible in urban areas with many subscribers, but it is difficult to implement in suburban areas with few subscribers due to high costs.
また、上述した基地局のアンテナの利得を高める従来の
方法をとる場合、携帯端末に対してサービスを提供する
にはビーム幅を更に大幅に狭くする必要性が考えられ、
その場合にはハンドオフの処理の大幅の増大が予測され
、基地局の規模が増大してしまう。このような問題点が
生じるのは、基地局においてそれぞれの指向性のアンテ
ナをあたかも独立した基地局であるかのように取り扱い
、異った通話チャネルを割り当てているためである。In addition, when using the conventional method of increasing the gain of the base station antenna described above, it is considered necessary to further narrow the beam width to provide services to mobile terminals.
In that case, a significant increase in handoff processing is expected, resulting in an increase in the scale of the base station. This problem arises because the base station treats each directional antenna as if it were an independent base station and assigns different communication channels.
しかし、郊外では加入者数がさほど多くないので加入者
密度を高めることはそれほど要求されずむしろ処理量の
増大が大きな問題となる。また、基地局では携帯端末と
違って十分に電源を供給することができるのでそれほど
送信電力を小さくする必要はない。However, since the number of subscribers is not so large in the suburbs, there is no great need to increase the subscriber density, and rather an increase in the amount of processing becomes a major problem. Furthermore, unlike mobile terminals, base stations can supply sufficient power, so there is no need to reduce transmission power so much.
本発明の目的は、基地局数を増大させることなく、しか
もハンドオフ処理のために基地局の規模が増大すること
もなく、車載端末のみならず携帯端末に対しても十分な
サービスエリアを確保することのできる移動通信基地局
を提供することにある。An object of the present invention is to secure a sufficient service area not only for in-vehicle terminals but also for mobile terminals without increasing the number of base stations and without increasing the scale of base stations due to handoff processing. The objective is to provide a mobile communication base station that can
本発明の移動通信基地局は、送信アンテナと、この送信
アンテナよりもビームを絞った複数の受信アンテナと、
これら複数の受信アンテナで受信された信号をダイバー
シティ受信するダイバーシティ回路とを備えている。The mobile communication base station of the present invention includes a transmitting antenna, a plurality of receiving antennas whose beams are narrower than the transmitting antenna,
The receiver includes a diversity circuit that performs diversity reception of signals received by the plurality of receiving antennas.
本発明では、以上のような考察に基づいて、基地局に於
て送信アンテナと受信アンテナを分離し、送信アンテナ
はあまり指向性をもたせずに比較的大きな電力で送信し
、受信アンテナに鋭い指向性をもたてせてアンテナゲイ
ンを高めて携帯端末からの信号を受信できるようにする
。チャネルの割当は送信アンテナ単位で行なうようにし
、複数の受信アンテナで送信アンテナと同一のサービス
エリアをカバーしている場合にはそれらの受信アンテナ
での受信信号をダイバーシティ合成して受信信号とする
。このようにすることにり、基地局に於て受信アンテナ
のゲインを大幅に高めることができ、携帯端末へのサー
ビスの提供が都市部のみならず郊外でも可能になるので
ある。Based on the above considerations, in the present invention, the transmitting antenna and receiving antenna are separated at the base station, the transmitting antenna transmits with relatively high power without much directivity, and the receiving antenna has a sharp directivity. To make it possible to receive signals from mobile terminals by increasing the antenna gain. Channel assignment is performed for each transmitting antenna, and when a plurality of receiving antennas cover the same service area as the transmitting antenna, the received signals from those receiving antennas are diversity-combined to form a received signal. By doing this, the gain of the receiving antenna at the base station can be greatly increased, making it possible to provide services to mobile terminals not only in urban areas but also in suburban areas.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図に本発明の一実施例を示す。FIG. 1 shows an embodiment of the present invention.
送信信号は入力端子１００から入力され、増幅機１０で
増幅されて送信アンテナ１０１から送信される。送信ア
ンテナ１０１の指向性は°第２図の破線で示したように
比較的広いものとする。−方、受信信号は受信アンテナ
１１１，１１２゜１１３．１１４，１１５．１１６から
受信され、ダイバーシティ回路２０で合成されて端子１
１０から出力される。各受信アンテナの指向性は第２図
の実線のように狭いものとする。ここで、ダイバーシテ
ィ合成の方法はアンテナ切り替え、選択ダイバーシティ
、合成ダイバーシティ等いろいろあるが、どの様な方法
を採用しても良いことは明らかである。また、第２図で
は送信アンテナ１０１に指向性があるものとして、受信
アンテナ１１１〜１１６は更に鋭い指向性のアンテナで
分割するようにして説明したが、送信アンテナは無指向
のものを用いても同じ効果が得られる。A transmission signal is input from an input terminal 100, amplified by an amplifier 10, and transmitted from a transmission antenna 101. It is assumed that the directivity of the transmitting antenna 101 is relatively wide as shown by the broken line in FIG. - On the other hand, the received signals are received from the receiving antennas 111, 112, 113, 114, 115, 116, are combined in the diversity circuit 20, and are combined at the terminal 1.
Output from 10. It is assumed that the directivity of each receiving antenna is narrow as shown by the solid line in FIG. Here, there are various methods of diversity combining, such as antenna switching, selection diversity, and combining diversity, but it is clear that any method may be adopted. Furthermore, in FIG. 2, the transmitting antenna 101 is assumed to have directivity, and the receiving antennas 111 to 116 are divided into antennas with even sharper directivity. However, it is also possible to use non-directional transmitting antennas. You can get the same effect.
以上説明したように本発明によるば、基地局数を増加さ
せることなく、また、基地局の規模が増大することなく
、携帯端末に対してもサービスを提供することが可能な
移動通信基地局を提供することができる効果がある。As explained above, the present invention provides a mobile communication base station that can provide services to mobile terminals without increasing the number of base stations or the scale of the base station. There are effects that can be provided.
第１図は本発明の一実施例を示すブロック図、第２図は
本実施例における送信アンテナ１０１及び受信アンテナ
１１１〜１１６の指向性を示す図である。
１０・・・増幅器、２０・・・ダイバーシティ回路、１
０１・・・送信アンテナ、１１１〜１１６・・・受信ア
ンテナ。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the directivity of a transmitting antenna 101 and receiving antennas 111 to 116 in this embodiment. 10...Amplifier, 20...Diversity circuit, 1
01...Transmission antenna, 111-116...Reception antenna.
Claims (1)
た複数の受信アンテナと、これら複数の受信アンテナで
受信された信号をダイバーシティ受信するダイバーシテ
ィ回路とを備えたことを特徴とする移動通信基地局。A mobile communication base station comprising a transmitting antenna, a plurality of receiving antennas whose beams are narrower than the transmitting antennas, and a diversity circuit that receives signals received by the plurality of receiving antennas in a diversity manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1167552A JPH0332119A (en) | 1989-06-28 | 1989-06-28 | Mobile communication base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1167552A JPH0332119A (en) | 1989-06-28 | 1989-06-28 | Mobile communication base station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0332119A true JPH0332119A (en) | 1991-02-12 |
Family
ID=15851835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1167552A Pending JPH0332119A (en) | 1989-06-28 | 1989-06-28 | Mobile communication base station |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0332119A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07202776A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Diversity receiver |
| WO2005048538A1 (en) * | 2003-11-17 | 2005-05-26 | Fujitsu Limited | Communication repeater, communication repeating method and communication repeating program |
-
1989
- 1989-06-28 JP JP1167552A patent/JPH0332119A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07202776A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Diversity receiver |
| WO2005048538A1 (en) * | 2003-11-17 | 2005-05-26 | Fujitsu Limited | Communication repeater, communication repeating method and communication repeating program |
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