JPS58195329A - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JPS58195329A JPS58195329A JP57076695A JP7669582A JPS58195329A JP S58195329 A JPS58195329 A JP S58195329A JP 57076695 A JP57076695 A JP 57076695A JP 7669582 A JP7669582 A JP 7669582A JP S58195329 A JPS58195329 A JP S58195329A
- Authority
- JP
- Japan
- Prior art keywords
- station
- base station
- base
- stations
- 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】
本発明は移動通信ンステムにおける基地局の送信出力切
替に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to switching the transmission output of a base station in a mobile communication system.
第１図は従来例による移動通信方式のプロ、り図を示す
。指令局２．複数の基地局３及び複数の車上局１を有し
、指令ｗＪ２は複数の基地局３−１〜３−３を弁して複
数の車上局ｌへ同一周波数で同時送信し、呼応する車上
局１からの受信電界の強弱を比較し１強受信電界基地局
の１局のみを選択して受信する通信方式である。すなわ
ち車上局１が一つの基地局３−１．３−２の１ノー７と
２ゾーンの境界にいるとき、受信基地局を受信電界強度
の強い方に決め、同一受信電界強震のときは車上局Ｉが
進行する上位局で受信する。しかし東り局１の受信は二
つの基地局３−１．３−２からの受信電界強度が同じ場
合、二波干渉となり通話品質が低下し、車上局１で通話
内容が聞きにくいという欠点がある、
本発明はこｎらの欠点を解決するため、車上局がゾーン
境界にあるとき、指令局から一方の基地局の送信出力を
切替えてゾーン境界を移動させ。FIG. 1 shows a professional diagram of a conventional mobile communication system. Command station 2. It has a plurality of base stations 3 and a plurality of on-vehicle stations 1, and the command wJ2 valves the plurality of base stations 3-1 to 3-3 to simultaneously transmit on the same frequency to the plural on-vehicle stations l and respond in response. This is a communication method in which the strength of the received electric field from the on-vehicle station 1 is compared and only one of the base stations with the strongest received electric field is selected and received. In other words, when the onboard station 1 is at the boundary between zones 1 and 7 of one base station 3-1, 3-2, and 2 zones, the receiving base station is determined to be the one with the stronger received electric field strength, and when the same received electric field strong earthquake occurs, The on-board station I receives it at the higher-level station it is traveling to. However, if the received field strengths from the two base stations 3-1 and 3-2 are the same, the eastbound station 1 has the disadvantage that it will cause double-wave interference and the quality of the call will deteriorate, making it difficult to hear the content of the call at the on-board station 1. In order to solve these drawbacks, the present invention moves the zone boundary by switching the transmission output of one base station from the command station when the onboard station is at the zone boundary.
車−Ｆ局に対して二波受信による干渉を低減させるもの
である。This is to reduce interference caused by dual wave reception to the Car-F station.
第２図は不発明の実施例による移動ｓ１６１００ブロッ
ク図を４くす。指令局からの通常の送受信は第１図と同
様に付き説明を省略する。ここで車上局１が基地局３−
１と基地局３−２のシー／境界にある場合、車上局１の
受１ｇ電波は基地局３−１と基地局３−２から同一レベ
ルで到達し、同時に車上局１からの電波も基地局３−１
．３−２に同一レベルで到達する。指令局２はこの基地
）＠３−１．３−２の受１呂電界を監視し、車上局ｌが
遠ざかる基地局３−２は覚悟電界が下がり、また車−Ｌ
局１が近つく基地局３−１は受信電界が」二がるので、
受信電界が上がる方の基地局３−１を優先するようにし
て基地局３−２の送信出力ｏＪｆＡＴ’ｌ’４−２を川
変し、ゾーン境界を下位局側にずらし。FIG. 2 is a block diagram of a mobile S16100 according to an embodiment of the invention. Normal transmission and reception from the command station is the same as in FIG. 1, and a description thereof will be omitted. Here, on-board station 1 is base station 3-
1 and base station 3-2, the 1G radio waves received by onboard station 1 arrive at the same level from base station 3-1 and base station 3-2, and at the same time the radio waves from onboard station 1 arrive at the same level. Also base station 3-1
．． Reach 3-2 at the same level. The command station 2 monitors the electric field of the base station 3-1.
Since the received electric field of base station 3-1, which station 1 approaches, is
The transmission output oJfAT'l'4-2 of the base station 3-2 is changed so as to give priority to the base station 3-1 whose received electric field is higher, and the zone boundary is shifted to the lower station side.
車上局１での基地局３−．１かもの受１１電界が基地＠
３−２からの覚悟電界よりも約１０ｄＢ高くなる、′
ようにする。このようにＩ）’／ （Ｊ比を大きくする
ことて車上局１での覚悟は、基地局３−１からの１局受
招と見なせるため通話品質は向上する。Base station 3-. 1 Kamo no Uke 11 Electric field is the base @
3-2 so that it is approximately 10 dB higher than the prepared electric field from 3-2. In this way, by increasing the I)'/(J ratio, the determination at the on-vehicle station 1 can be regarded as an invitation to one station from the base station 3-1, and thus the call quality is improved.
受１ｄ電界変化の検出方法とし７ては、覚悟電界を周波
数に変換して強電界のときは周波数を高クシ。As a method for detecting changes in the received 1d electric field, convert the prepared electric field into a frequency and increase the frequency when the electric field is strong.
弱電界のときは周波数が低くなるように収ボしておき、
そ扛ぞれ高域Ｐｅ６．低域１波器で周波数を監視する。When the electric field is weak, focus the frequency so that it is low,
High range Pe6. Monitor the frequency with a low-frequency single wave device.
低域ｆ１波器の出力が竹から無に変化し、高域１７Ｉ波
器の出力が無から有に変化しだら車上局が近ついて来る
と判断し、逆の場合は車上局が遠ざかるものと判断する
。捷だ低域ｔ１波器、高域ｄ１阪器の力、トオフ周波数
をオーバーラツプするようにしておき、共に出力有のと
き遠ざかる方の基地局の送信出力を制御する。If the output of the low-frequency F1 wave device changes from bamboo to nothing, and the output of the high-frequency 17I wave device changes from nothing to presence, it is determined that the on-board station is approaching, and in the opposite case, the on-board station will move away. judge it as something. The power of the low-frequency t1 wave transmitter and the high-frequency d1 wave transmitter are made to overlap the to-off frequency, and when both have output, the transmission output of the base station moving away is controlled.
以トのように本発明によれば、車上局は同一周波数の一
波受１ｇによる干渉が低減されるので通話品質を改善で
きる。As described above, according to the present invention, the on-vehicle station can improve the call quality because the interference caused by the single wave reception 1g of the same frequency is reduced.
１゛
第１図は従来例による移動通信方式のプロ、り凶、第２
図は本些明の実施例による移動通信方式のプロ、り図で
あス。
１ 車上局、２ 指令局、３−１〜３−３ 基地
１局、４−１〜４−３：送１ｇ出力可変Ａ ’Ｉ”
Ｔ 。1゛Figure 1 shows a conventional example of a mobile communication system.
The figure is a professional diagram of a mobile communication system according to an embodiment of the present invention. 1 Onboard station, 2 Command station, 3-1 to 3-3 Base
1st station, 4-1 to 4-3: Transmission 1g output variable A 'I'
T.
Claims (1)
局に同−周波数で同時送信し１呼応する前記車上局から
の電波を受信するのに前記複数の基地局の中から受１ｇ
電界強匿の強い基地局を選択して受信する移動通信ンス
テムにおいて、前記指令局は前記呼応する車上局が前記
基地局のゾーン境界にいるとき、このゾーンを形成する
何れか一方の基地局の送信出力を切替えて前記シーツ境
界を移動させ、前記呼応する車上局に対し二波受ｆ６に
よる干渉障害を低減させるようにしたことを特徴とする
移動通信方式。[Claims] It has a command station, a plurality of base stations, and a plurality of on-vehicle stations. The command station simultaneously transmits radio waves at the same frequency to the plurality of on-vehicle stations via the plurality of base stations, and receives radio waves from the on-vehicle stations that respond to one call from among the plurality of base stations. 1g
In a mobile communication system that selects and receives a base station with strong electric field strength, when the corresponding on-vehicle station is at the zone boundary of the base station, the command station selects one of the base stations forming this zone. 1. A mobile communication system characterized in that the sheet boundary is moved by switching the transmission output of the transmitter, thereby reducing interference caused by dual wave reception f6 to the corresponding on-vehicle station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57076695A JPS58195329A (en) | 1982-05-10 | 1982-05-10 | Mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57076695A JPS58195329A (en) | 1982-05-10 | 1982-05-10 | Mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58195329A true JPS58195329A (en) | 1983-11-14 |
Family
ID=13612614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57076695A Pending JPS58195329A (en) | 1982-05-10 | 1982-05-10 | Mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58195329A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143036A (en) * | 1983-12-29 | 1985-07-29 | Nec Corp | Radio communication system |
| JPH01255325A (en) * | 1988-03-03 | 1989-10-12 | Motorola Inc | Equipment and method for antenna beam boundary detection |
| JPH0583181A (en) * | 1991-09-25 | 1993-04-02 | Nec Corp | Train radio communication system |
| JPH0661905A (en) * | 1992-08-05 | 1994-03-04 | Mitsubishi Electric Corp | Train radio system |
-
1982
- 1982-05-10 JP JP57076695A patent/JPS58195329A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60143036A (en) * | 1983-12-29 | 1985-07-29 | Nec Corp | Radio communication system |
| JPH01255325A (en) * | 1988-03-03 | 1989-10-12 | Motorola Inc | Equipment and method for antenna beam boundary detection |
| JPH0583181A (en) * | 1991-09-25 | 1993-04-02 | Nec Corp | Train radio communication system |
| JPH0661905A (en) * | 1992-08-05 | 1994-03-04 | Mitsubishi Electric Corp | Train radio system |
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