JPH0245854B2 - - Google Patents
Info
- Publication number
- JPH0245854B2 JPH0245854B2 JP58018103A JP1810383A JPH0245854B2 JP H0245854 B2 JPH0245854 B2 JP H0245854B2 JP 58018103 A JP58018103 A JP 58018103A JP 1810383 A JP1810383 A JP 1810383A JP H0245854 B2 JPH0245854 B2 JP H0245854B2
- Authority
- JP
- Japan
- Prior art keywords
- interference
- frequency
- modulated
- mobile communication
- mobile
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 9
- 238000010295 mobile communication Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 description 11
- 230000005236 sound signal Effects 0.000 description 5
- 238000005562 fading Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
Description
【発明の詳細な説明】
（技術分野）
同一周波数を異なる地域で繰り返して使用する
移動通信方式において、通話中に干渉を検出する
方法に関するものである。Detailed Description of the Invention (Technical Field) The present invention relates to a method for detecting interference during a call in a mobile communication system that repeatedly uses the same frequency in different areas.
（背景技術）
従来、同一周波数を異なる地域で繰り返して使
用する移動通信方式では、平均的な受信電界レベ
ルをもとに回線設計や置局を行い、必要な干渉保
護比が得られるよう、繰り返し無線ゾーン数、無
線ゾーン半径を定めて通常は干渉を生じないよう
対策を行つている。(Background technology) Conventionally, in mobile communication systems that repeatedly use the same frequency in different areas, line design and station placement are based on the average received electric field level, and repeated transmission is performed to obtain the required interference protection ratio. Measures are normally taken to prevent interference by determining the number of wireless zones and the radius of the wireless zone.
しかし移動通信では複雑な伝搬路を形成してい
るため、希望波と干渉波のレベルが干渉保護比を
劣化させる方向に大きく変動し、場所によつては
干渉が発生することがある。従つて通話中に干渉
が発生した場合、干渉量を検出して許容値を越え
ていれば、干渉のない他のチヤネルに切替えるな
どの有効な対策を行うことが望ましい。 However, in mobile communications, complex propagation paths are formed, so the levels of desired waves and interference waves vary greatly in a direction that degrades the interference protection ratio, and interference may occur depending on the location. Therefore, when interference occurs during a call, it is desirable to detect the amount of interference and, if it exceeds a tolerance value, take effective measures such as switching to another channel free of interference.
現在、このような移動通信方式における干渉検
出方法としては、同一周波数を使用する基地局に
音声帯域外のトーン信号を割り当てて角度変調を
行い、受信側でこのトーン信号を受信することに
よつて干渉を検出する方法が考えられている。 Currently, the interference detection method in such mobile communication systems is to allocate tone signals outside the voice band to base stations that use the same frequency, perform angle modulation, and receive this tone signal on the receiving side. Methods for detecting interference have been considered.
（発明の課題）
本発明は、同一周波数を使用する無線基地局の
搬送波をそれぞれ異なる周波数で振幅変調し、受
信側で包絡線検波することによつて、この周波数
を受信し干渉を検出するものである。(Problems to be solved by the invention) The present invention is a system that amplitude-modulates the carrier waves of radio base stations that use the same frequency at different frequencies, and performs envelope detection on the receiving side to receive this frequency and detect interference. It is.
（発明の構成および作用）
第１図は、移動通信の無線ゾーン構成例を示
す。第１図において、Z1は無線基地局による無線
ゾーンを、Z21からZ23は周波数繰り返しの基本単
位を表わす。またA1からA7は各無線ゾーン内の
周波数群を表わし、各基本単位毎で同一の周波数
群が使用される。1から7はは干渉検出のために
各基本単位に割り当てた干渉チエツク周波数を表
わす。基地局では自局の存在する基本単位に割り
当てられている干渉チエツク周波数を使用し、移
動機は基本単位ゾーンを変るごとに例えばZ21の
時は7、Z22の時は6というように干渉チエツク
周波数を使用する。即ち、相互に干渉する可能性
のある無線ゾーンの間で使用する干渉チエツク周
波数を異ならせる。(Structure and operation of the invention) FIG. 1 shows an example of a wireless zone structure for mobile communication. In FIG. 1, Z 1 represents a wireless zone by a wireless base station, and Z 21 to Z 23 represent a basic unit of frequency repetition. Further, A 1 to A 7 represent frequency groups within each radio zone, and the same frequency group is used for each basic unit. 1 to 7 represent interference check frequencies assigned to each basic unit for interference detection. The base station uses the interference check frequency assigned to the basic unit in which the mobile station is located, and the mobile station checks interference every time it changes the basic unit zone, such as 7 for Z 21 and 6 for Z 22 . Use check frequency. That is, different interference check frequencies are used between radio zones that may interfere with each other.
第２図は、移動機への干渉チエツク周波数の指
定方法の一例をフローチヤートで表わす。 FIG. 2 is a flowchart illustrating an example of a method for specifying an interference check frequency to a mobile station.
第３図は、干渉検出機能を付加した送受信回路
の一例であり、Ａは送信系、Ｂは受信系を示す。
点線内は干渉検出に関する部分である。なお、図
面中の１は音声信号入力端子、２は制御信号入力
端子、３は干渉チエツク周波数入力端子、４は
FM変調器、５は周波数変換器、６は局部発振
器、７はAM変調器、８は電力増幅器、９は送受
信用アンテナ、１０はIF帯帯域ろ波器、１１は
IF帯分岐回路、１２は包絡線検波器、１３は1用
受信機、１４は7用受信機、１５は干渉検出回
路、１６は振幅制限器、１７はFM復調器であ
る。 FIG. 3 shows an example of a transmitting/receiving circuit with an added interference detection function, where A indicates a transmitting system and B indicates a receiving system.
The part within the dotted line is related to interference detection. In addition, 1 in the drawing is an audio signal input terminal, 2 is a control signal input terminal, 3 is an interference check frequency input terminal, and 4 is an audio signal input terminal.
FM modulator, 5 is a frequency converter, 6 is a local oscillator, 7 is an AM modulator, 8 is a power amplifier, 9 is a transmitting/receiving antenna, 10 is an IF bandpass filter, 11 is a
IF band branch circuit, 12 is an envelope detector, 13 is a receiver for 1 , 14 is a receiver for 7 , 15 is an interference detection circuit, 16 is an amplitude limiter, and 17 is an FM demodulator.
本発明について説明する。第１図において移動
機が今、第１図に示す無線ゾーン内にいるとすれ
ば、Z21、Z23ゾーンのA1周波数群を使用している
無線ゾーンから干渉を受けることになる。もし干
渉レベルが充分に低ければ、移動機は1という干
渉チエツク周波数だけを検出する。しかし、同一
周波数群を使用する基地局からの干渉レベルが高
くなると、1の他に例えば6、7が検出され、干
渉局の識別が可能となり、また、1の受信レベル
との比を取ることにより干渉比を求めることがで
きる。この干渉検出動作は、無線基地局が同一周
波数を使用している複数の移動機から干渉を受け
る場合も同様である。なお、移動機が送出する干
渉チエツク周波数の周波数指定方法には、一例と
して第２図に示すように、移動機が存在する無線
ゾーンの無線基地局から制御チヤネルを用いて指
定する方法がある。 The present invention will be explained. In FIG. 1, if the mobile device is currently in the wireless zone shown in FIG. 1, it will receive interference from the wireless zone using the A1 frequency group in the Z 21 and Z 23 zones. If the interference level is low enough, the mobile will only detect an interference check frequency of 1 . However, when the interference level from base stations that use the same frequency group increases, in addition to 1 , for example, 6 and 7 are detected, making it possible to identify the interfering station, and also to calculate the ratio with the reception level of 1 . The interference ratio can be determined by This interference detection operation is similar even when a wireless base station receives interference from a plurality of mobile devices using the same frequency. As an example of a method of specifying the interference check frequency transmitted by a mobile device, as shown in FIG. 2, there is a method of specifying the interference check frequency using a control channel from a wireless base station in a wireless zone where the mobile device is present.
第３図は干渉検出の回路構成例を示している。
送信系では最終段にAM変調器７を加え、干渉チ
エツク周波数入力端子３から入力された周波数１
波を用いて、音声信号などですでに角度変調され
ている搬送波を振幅変調し、電力増幅器８で増幅
後、アンテナ９より空間へ放射する。なお、振幅
変調時の変調度は、角度変調されている搬送波に
影響しない変調度とする。受信系では、振幅制限
器１６に入る前段のIF分岐回路１１でIF信号を
分岐し、包絡線検波器１２によつてAM波成分を
取り出す。この場合、包絡線検波器１２の時定数
は、移動機が動くことによつて生ずるフエージン
グ周期より充分長く選んでおき、干渉チエツク周
波数成分だけ出力されるようにする。このように
して取り出された出力は干渉チエツク用受信機を
通り、干渉検出回路１５で干渉量または干渉比と
して出力される。なおこの干渉検出方法における
干渉チエツク周波数は、受信搬送波に通常フエー
ジング周波数がAM成分で重畳されるため、この
フエージング周波数のスペクトラム外で選ぶ必要
がある。しかし、この周波数帯域を除けば通話信
号、制御信号と変調方式が基本的に異なり、これ
らの信号の周波数帯域も含めて自由に周波数を選
定できる利点がある。 FIG. 3 shows an example of a circuit configuration for interference detection.
In the transmission system, an AM modulator 7 is added to the final stage, and the frequency 1 input from the interference check frequency input terminal 3 is
Using the wave, a carrier wave that has already been angle-modulated by an audio signal or the like is amplitude-modulated, and after being amplified by a power amplifier 8, it is radiated into space from an antenna 9. Note that the degree of modulation during amplitude modulation is set to a degree of modulation that does not affect the angle-modulated carrier wave. In the receiving system, an IF branch circuit 11 before entering the amplitude limiter 16 branches the IF signal, and an envelope detector 12 extracts the AM wave component. In this case, the time constant of the envelope detector 12 is selected to be sufficiently longer than the fading period caused by the movement of the mobile station, so that only the interference check frequency component is output. The output extracted in this manner passes through an interference check receiver and is output by the interference detection circuit 15 as an amount of interference or an interference ratio. Note that the interference check frequency in this interference detection method must be selected outside the spectrum of the fading frequency, since the fading frequency is usually superimposed on the received carrier wave as an AM component. However, except for this frequency band, the modulation method is fundamentally different from that of the speech signal and the control signal, and there is an advantage that the frequency can be freely selected including the frequency band of these signals.
以上では干渉チエツク用信号として周波数を７
つとし、これらを周波数繰り返しの基本単位ゾー
ンに割り当てる例について説明したが、７つの周
波数に限る必要はなく、干渉を受ける可能性のあ
る無線ゾーンの数だけ用意すれば充分である。ま
た、基本単位ゾーンの中では同じ干渉チエツク周
波数を使用する方法で説明したが、本発明はこれ
に限らず、例えばZ22のゾーン内ではA1に1、A2
に2、A3に3というように、またZ21ゾーンでは
A1に2、A2に3、A3に4というように異なる周
波数を割り当てて使用することもできる。 In the above, the frequency is set to 7 as the interference check signal.
Although an example has been described in which these frequencies are assigned to basic unit zones of frequency repetition, it is not necessary to limit the number of frequencies to seven, and it is sufficient to prepare as many radio zones as are likely to receive interference. Furthermore, although the method has been described in which the same interference check frequency is used within the basic unit zone, the present invention is not limited to this .
2 in , 3 in A 3 and so on, and in Z 21 zone
Different frequencies can be assigned and used, such as 2 to A 1 , 3 to A 2 , and 4 to A 3 .
（発明の効果）
以上説明したように、音声信号などで角度変調
されている搬送波を、更に干渉チエツク周波数を
用いて振幅変調を行つているため、干渉局の識別
と干渉レベルを検出できる利点がある。また、干
渉チエツク周波数は音声信号と変調方式が異なる
ため周波数を自由に選定できる利点がある。(Effects of the Invention) As explained above, since the angle-modulated carrier wave, such as an audio signal, is further amplitude-modulated using the interference check frequency, it has the advantage of being able to identify interfering stations and detect the interference level. be. Further, since the interference check frequency uses a different modulation method from that of the audio signal, there is an advantage that the frequency can be freely selected.
第１図は移動通信の無線ゾーンの構成例、第２
図は移動機への干渉チエツク周波数の指定を示す
フローチヤート、第３図Ａ及びＢは干渉検出機能
を付加した送受信回路の例である。
Figure 1 shows an example of the configuration of a wireless zone for mobile communications.
The figure is a flow chart showing the designation of an interference check frequency to a mobile station, and FIGS. 3A and 3B are examples of a transmitting/receiving circuit to which an interference detection function is added.
Claims (1)
る角度変調方式の移動通信方式において、角度変
調されている搬送波を更に、相互に干渉する可能
性のある無線ゾーンに割り当てた周波数で、振幅
変調を行い、この被変調波を復調することによつ
て干渉を検出することを特徴とする移動通信方式
の通話中干渉検出方法。1. In an angle modulation mobile communication system in which the same frequency is repeatedly used in different areas, the angle modulated carrier wave is further amplitude modulated at a frequency assigned to a wireless zone where there is a possibility of mutual interference. A method for detecting interference during a call in a mobile communication system, characterized in that interference is detected by demodulating this modulated wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58018103A JPS59144227A (en) | 1983-02-08 | 1983-02-08 | In-service interference detecting method of mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58018103A JPS59144227A (en) | 1983-02-08 | 1983-02-08 | In-service interference detecting method of mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59144227A JPS59144227A (en) | 1984-08-18 |
| JPH0245854B2 true JPH0245854B2 (en) | 1990-10-12 |
Family
ID=11962287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58018103A Granted JPS59144227A (en) | 1983-02-08 | 1983-02-08 | In-service interference detecting method of mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59144227A (en) |
-
1983
- 1983-02-08 JP JP58018103A patent/JPS59144227A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59144227A (en) | 1984-08-18 |
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