JPS589442A - Signal receiver of mobile radio station - Google Patents
Signal receiver of mobile radio stationInfo
- Publication number
- JPS589442A JPS589442A JP56108738A JP10873881A JPS589442A JP S589442 A JPS589442 A JP S589442A JP 56108738 A JP56108738 A JP 56108738A JP 10873881 A JP10873881 A JP 10873881A JP S589442 A JPS589442 A JP S589442A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- base station
- switching
- mobile radio
- radio 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/18—Automatic scanning over a band of frequencies
- H03J7/183—Automatic scanning over a band of frequencies combined with selection between different stations transmitting the same programm, e.g. by analysis of the received signal strength
Abstract
Description
【発明の詳細な説明】
この発明は、移動無線局の受信装置に関するものである
。オｌの基地局がオｌの周波数を搬送波周波数として情
報を送信し、このオｌの基地局とは異なる位置に設置さ
れている第２の基地局が第２の周波数を搬送波周波数と
して情報を送信し、オｌの基地局からの送信と第２の基
地局からの送信とを共に受信できる範囲内にある移動無
線局では第１の搬送波周波数の受信レベルと第２の搬送
波周波数の受信レベルとを比較し、受信レベルの大きい
方の搬送波周波数に対する受信出力を利用するという方
法が用いられている。オｌの基地局も第２の基地局も一
般には同一情報を送出しているので、移動無線局は最も
良好な受信状態を提供する基地局を利用することができ
るー
移動無線局受信装置の切換方法として最も簡単なものは
、常に受信レベルの大きい方の搬送波周波数を選んで受
信することであるが、この方法では、両基地局からの電
界レベルが同程度である領域内において頻繁な切換が行
われ、切換により発生する雑音等のため通信の品質低下
を来すという欠点があった。す々わち、電界レベルは種
々な原因によって複雑々微小量変化をするので、両基地
局からの電界レベルが同程度である領域内では、両方の
電界レベルが交差する地点が多数発生しこのような地点
を移動無線局が通過するごとに切換が行われるからであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving device for a mobile radio station. The original base station transmits information using the original frequency as a carrier wave frequency, and the second base station installed at a different location from the original base station transmits information using the second frequency as the carrier wave frequency. A mobile radio station within a range where it can transmit and receive both the transmission from the first base station and the transmission from the second base station receives the reception level of the first carrier frequency and the reception level of the second carrier frequency. A method is used in which the received output for the carrier frequency with the higher received level is used. Since both the first base station and the second base station generally transmit the same information, the mobile radio station can use the base station that provides the best reception. The simplest switching method is to always select the carrier frequency with the higher reception level for reception, but this method requires frequent switching within an area where the electric field level from both base stations is about the same. However, there was a drawback in that communication quality deteriorated due to noise generated by switching. In other words, the electric field level changes minutely in a complex manner due to various causes, so in an area where the electric field levels from both base stations are about the same, there will be many points where the electric field levels of both base stations intersect. This is because switching is performed every time a mobile radio station passes such a point.
この発明は上述の欠点を除去するためになされたもので
、計測用受信機を別に設け、この計測用受信機によって
両受信レベルを常時測定し、測定結果を記憶し、この記
憶内容から判断して通信用受信機の受信する搬送波周波
数を切換えて、頻繁な受信切換を発生することなく常に
良好な受信状態の電波を選択受信できる受信装置を提供
することを目的としている。This invention was made in order to eliminate the above-mentioned drawbacks. A measurement receiver is separately provided, the measurement receiver constantly measures both reception levels, the measurement results are stored, and judgments are made based on the stored contents. It is an object of the present invention to provide a receiving device that can selectively receive radio waves with good reception conditions at all times without having to frequently switch reception by switching carrier frequencies received by a communication receiver.
以下、図面についてこの発明の詳細な説明する。第１図
はこの発明の一実施例を示すブロック図で、移動無線局
の構成を示し、（１）はアンテナ、（２）は分配器、（
３）は通信用受信機、（３−１）、（３−２）はそれぞ
れ−３□ を及び第２の周波数の搬送波周波数を受信す
るための受信用水晶発振子、（４）は計測用受信機、（
５）は記憶装置、（６）は比較回路、（７）は切換装置
である。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, showing the configuration of a mobile radio station, in which (1) is an antenna, (2) is a distributor, (
3) is a communications receiver, (3-1) and (3-2) are receiving crystal oscillators for receiving -3□ and the carrier frequency of the second frequency, respectively, and (4) is a measuring crystal oscillator. Receiving machine,(
5) is a storage device, (6) is a comparison circuit, and (7) is a switching device.
計測用受信機＋４１では常時、第１及び第２の周波数の
搬送波周波数を切換え受信してその受信レベルの経過を
記憶装置（５）に記憶する、比較回路（６）は記憶装置
（５）の内容を比較し、切換装置（７）は比較回路（６
）の出力から判断して通信用受信機＋３１の受信する搬
送周波数の切換を行う。The measurement receiver +41 constantly switches and receives the carrier wave frequencies of the first and second frequencies and stores the progress of the reception level in the storage device (5).The comparison circuit (6) is connected to the storage device (5). The switching device (7) connects the comparison circuit (6
), the carrier frequency received by the communication receiver +31 is switched.
第２図は移動無線局における受信レベルと移動無線局の
位置との関係を示すレベル図であって、移動無線局は両
基地局をつらねる線上を移動するものとし、Ｐｌはオｌ
の基地局の位置、几は第２の基地局の位＃を示し、移動
無線局はＰＩＰ２Ｐ３Ｐ４Ｐ５上を移動するものとする
。曲線ＡＧはオｌの基地局からの送信に対する受信レベ
ル、曲線ＦＥは第２の基地局からの送信に対する送信レ
ベルを示す。FIG. 2 is a level diagram showing the relationship between the reception level at a mobile radio station and the position of the mobile radio station, in which the mobile radio station is assumed to move on a line connecting both base stations, and Pl is an orthogonal radio station.
It is assumed that the location of the base station, 几, indicates the rank of the second base station, and the mobile radio station moves on PIP2P3P4P5. Curve AG shows the reception level for transmission from the first base station, and curve FE shows the transmission level for transmission from the second base station.
移動無線局がＰｌからＰ５の方向に移動する場合を考え
、通信用受信機（３）は最初オｌの基地局からの送信を
受信しているとする。移動無線局がＰ２Ｐ３Ｐ４を通過
すると記憶装置（５）は受信レベルの経過ＢＣＧ及びＦ
ＣＤ’を記憶し２４点では第２の基地局からの受信レベ
ルが第１の基地局からの受信レベルよりも確実に大きく
々つていると判断されるので、切換装置（７）が動作し
て通信用受信機（３）が第２の基地局からの送信を受信
するように切換える、第２図の曲線ＡＢＣＧ％ＥＤＣＦ
は簡単な曲線で表しであるが、実際には受信レベルは種
々の複雑彦原因によって小さな範囲に変動するため、第
２図Ｐ３点近傍で実測した受信レベルでは、両受信レベ
ルが交差する点が０点以外にも現われ、２４点ではじめ
て第２の基地からの送信の方がオｌの基地からの送信よ
り確実に受信レベルが高いことが判定できる。移動無線
局がＰ５からＰｏの方向へ移動するときは同様にＰ２
点において通信用受信機（３：の受信する搬送周波数
を切換える。したがって切換が頻繁に行われるとと々く
、常に良好な受信状態を得ることができる。Consider the case where the mobile radio station moves in the direction from P1 to P5, and assume that the communication receiver (3) initially receives transmission from base station O1. When the mobile radio station passes through P2P3P4, the storage device (5) records the reception level progress BCG and F.
CD' is memorized and at the 24th point, it is determined that the reception level from the second base station definitely fluctuates more than the reception level from the first base station, so the switching device (7) is activated. Curve ABCG%EDCF of FIG. 2 where the communications receiver (3) switches to receive transmissions from the second base station.
is represented by a simple curve, but in reality the reception level fluctuates within a small range due to various complicated causes, so in the reception level actually measured near point P3 in Figure 2, the point where both reception levels intersect is It appears at points other than 0, and only at 24 points can it be determined that the reception level of the transmission from the second base is definitely higher than that of the transmission from the first base. Similarly, when the mobile radio station moves from P5 to Po direction, P2
At this point, the carrier frequency received by the communication receiver (3) is switched. Therefore, if switching is performed frequently, a good reception condition can always be obtained.
以上の説明では第１０基地局と第２の基地局との２つの
基地局に対する切換を前提としてこの発明を説明したが
、基地局の数が３以上あるときは２つあての基地局のす
べての組合せに対してそれぞれこの発明を実施すれば、
その結果として最も受信レベルの大きな基地局を選ぶこ
とができる。In the above explanation, this invention has been explained on the premise of switching to two base stations, the tenth base station and the second base station. However, when the number of base stations is three or more, all of the base stations destined for the two base stations are switched. If this invention is implemented for each combination of
As a result, the base station with the highest reception level can be selected.
以上のように、この発明によれば移動無線局において受
信切換を頻繁に行うという欠点を除去し、しかも常に良
好な受信状態を得ることができる。As described above, according to the present invention, it is possible to eliminate the disadvantage of frequent reception switching in a mobile radio station and to always obtain a good reception condition.
第１図はこの発明の一実施例を示すブロック図、第２図
゛は移動無線局位置と受信レベルとの関係を示すレベル
図である。
（１）・−・アンテナ、（２）・・・分配器、（３１・
・・通信用受信機、（４）・・・計測用受信機、（５）
・・・記憶装置、（７）・・・切換装置。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a level diagram showing the relationship between mobile radio station position and reception level. (1)...Antenna, (2)...Distributor, (31...
...Communication receiver, (4)...Measurement receiver, (5)
...Storage device, (7)...Switching device.
Claims (2)
局からの送信と、このオｌの基地局とは異なる位置に設
置され上記オｌの周波数とは異なる第２の周波数を搬送
波として送信する第２の基地局からの送信とのうちいず
れかを選択受信する移動無線局の受信装置において、 上記第１の基地局からの送信と上記第２の基地局からの
送信とを切換えて受信しそれぞれの受信レベルを表す信
号を出力する計測用受信機と、この計測用受信機の出力
信号の経過を記憶する記憶装置と、 この記憶装置に記憶された内容から判断して通信用受信
機において現在受信中の搬送波周波数を切換える周波数
切換装置とを備えたことを特徴とする移動無線局の受信
装置。(1) Transmission from an original base station that transmits a first frequency as a carrier wave, and a second frequency that is installed at a different location from the original base station and that is different from the original frequency as a carrier wave. In a receiving device for a mobile radio station that selectively receives transmissions from a second base station, switching between transmissions from the first base station and transmissions from the second base station; A measurement receiver that receives signals and outputs signals representing respective reception levels, a storage device that stores the progress of the output signals of this measurement receiver, and a communication reception device that determines from the contents stored in this storage device. 1. A receiving device for a mobile radio station, comprising: a frequency switching device for switching a carrier frequency currently being received at the mobile radio station.
より現在受信中の搬送波周波数に対する受信レベルが他
の搬送波周波数に対する受信レベルより所定デシベル以
上低いことが検知されたとき上記他の搬送波周波数を受
信するよう切換ることを特徴とする特許請求の範囲オ１
項記載の移動無線局の受信装置。(2) The frequency switching device switches the other carrier wave frequency when it is detected that the reception level for the carrier wave frequency currently being received is lower than the reception level for other carrier wave frequencies by a predetermined decibel or more based on the contents stored in the storage device. Claim O1 characterized in that switching to receive
A receiving device for a mobile radio station according to paragraph 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56108738A JPS589442A (en) | 1981-07-09 | 1981-07-09 | Signal receiver of mobile radio station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56108738A JPS589442A (en) | 1981-07-09 | 1981-07-09 | Signal receiver of mobile radio station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS589442A true JPS589442A (en) | 1983-01-19 |
Family
ID=14492267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56108738A Pending JPS589442A (en) | 1981-07-09 | 1981-07-09 | Signal receiver of mobile radio station |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS589442A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01180134A (en) * | 1988-01-11 | 1989-07-18 | Nec Corp | Method for switching channel during communication of mobile communication system and mobile terminal equipment |
| USRE36309E (en) * | 1987-11-27 | 1999-09-21 | Nec Corporation | Handoff method for cellular digital mobile communication system and mobile station |
-
1981
- 1981-07-09 JP JP56108738A patent/JPS589442A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE36309E (en) * | 1987-11-27 | 1999-09-21 | Nec Corporation | Handoff method for cellular digital mobile communication system and mobile station |
| JPH01180134A (en) * | 1988-01-11 | 1989-07-18 | Nec Corp | Method for switching channel during communication of mobile communication system and mobile terminal equipment |
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