JPH0576813B2 - - Google Patents

Info

Publication number
JPH0576813B2
JPH0576813B2 JP59025162A JP2516284A JPH0576813B2 JP H0576813 B2 JPH0576813 B2 JP H0576813B2 JP 59025162 A JP59025162 A JP 59025162A JP 2516284 A JP2516284 A JP 2516284A JP H0576813 B2 JPH0576813 B2 JP H0576813B2
Authority
JP
Japan
Prior art keywords
station
ratio
interference
transmission output
channel
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
Application number
JP59025162A
Other languages
Japanese (ja)
Other versions
JPS60172838A (en
Inventor
Tadaaki Nakada
Suomi Juki
Katsumi Kobayashi
Ryuji Habuka
Kyoto Nagata
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.)
NTT Docomo Inc
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
NTT Mobile Communications Networks Inc
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, NTT Mobile Communications Networks Inc filed Critical Nippon Telegraph and Telephone Corp
Priority to JP59025162A priority Critical patent/JPS60172838A/en
Publication of JPS60172838A publication Critical patent/JPS60172838A/en
Publication of JPH0576813B2 publication Critical patent/JPH0576813B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/005Control of transmission; Equalising

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 本発明は移動通信方法に関するものである。[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a mobile communication method.

〔従来技術とその問題点〕[Prior art and its problems]

第1図は移動通信方法における一般的な無線ゾ
ーン構成の概念を示した概念図である。同図にお
いて、1はサービスエリア、2は小無線ゾーン、
3は無線基地局、4は移動局(例えば自動車)、
である。
FIG. 1 is a conceptual diagram showing the concept of a general wireless zone configuration in a mobile communication method. In the figure, 1 is a service area, 2 is a small wireless zone,
3 is a wireless base station, 4 is a mobile station (for example, a car),
It is.

各小無線ゾーン2における無線基地局3は、図
示せざる無線制御局、移動局(自動車)用交換局
を介して一般電話回線網と接続されている。ここ
で小無線ゾーン2は、移動局4の送信電力によつ
て該移動局4と当該ゾーンの無線基地局3との間
で充分に通信可能となる広さに決められている。
The radio base stations 3 in each small radio zone 2 are connected to a general telephone network via a radio control station and a mobile station (automobile) switching center (not shown). Here, the small wireless zone 2 is determined to have a size that allows sufficient communication between the mobile station 4 and the wireless base station 3 in the zone depending on the transmission power of the mobile station 4.

サービスエリア1内の各小無線ゾーン2には、
本来、周波数帯域の異なる通話チヤネルが配置さ
れるわけであるが、一定距離へだてた小無線ゾー
ン同士では、干渉の恐れがないので、同じ周波数
帯域の通話チヤネルが繰り返し用いられている。
In each small wireless zone 2 within the service area 1,
Originally, communication channels with different frequency bands are arranged, but communication channels with the same frequency band are used repeatedly in small wireless zones spread out at a certain distance because there is no risk of interference.

第1図では、小無線ゾーンAとBがこの例に当
り、両ゾーンでは、移動局4から基地局3に向か
う上りチヤネル周波数1と、基地局3から移動局
4に向かう下りチヤネル周波数2が、それぞれ同
じ周波数になつている。
In FIG. 1, small wireless zones A and B are an example of this, and in both zones, uplink channel frequency 1 from mobile station 4 to base station 3 and downlink channel frequency 2 from base station 3 to mobile station 4 are , each has the same frequency.

かかる小無線ゾーンAとBの間では、干渉の恐
れが少ないとは云つても、諸般の事情によりチヤ
ネル間干渉の起きる可能性がある。干渉が起きた
とき、干渉の程度を表わすチヤネル間干渉量は、
受信を希望する希望波の受信レベルDと、受信を
希望しない干渉波の受信レベルUとの比(D/
U)によつて表わされる。小無線ゾーンAを例に
とつて説明すれば、移動局4においては基地局3
から到来する周波数2の信号が希望波であり、小
無線ゾーンBの基地局から入来する周波数2の信
号が干渉波である。
Although there is little risk of interference between such small wireless zones A and B, there is a possibility that inter-channel interference may occur due to various circumstances. When interference occurs, the amount of interference between channels, which indicates the degree of interference, is
The ratio of the reception level D of desired waves that you wish to receive and the reception level U of interference waves that you do not wish to receive (D/
U). Taking small wireless zone A as an example, mobile station 4 has base station 3.
The signal of frequency 2 coming from the base station of small wireless zone B is the desired wave, and the signal of frequency 2 coming from the base station of small wireless zone B is the interference wave.

チヤネル間干渉量D/Uの比が一定限度以下に
なると通話が困難になるので、その許容限度値が
定められている。
If the ratio of the inter-channel interference amount D/U falls below a certain limit, it will be difficult to make a call, so a permissible limit value is determined.

さて、移動通信方式において、上述のようなチ
ヤネル間干渉がなるべく生じないようにするため
に、移動局と基地局の間で、相互に通話信号の受
信レベルを監視し、それによつてお互いの送信出
力を制御する送信出力制御方式が採用されてい
る。
Now, in mobile communication systems, in order to prevent the above-mentioned inter-channel interference from occurring as much as possible, mobile stations and base stations mutually monitor the reception level of call signals, and thereby monitor each other's transmissions. A transmission output control method is adopted to control the output.

第2図は送信出力制御の関係を示したグラフで
ある。すなわち、同図に見られるように、例えば
移動局では、無線基地局からの通話信号の受信レ
ベルを監視し、それが高いときには無線基地局の
送信出力を低減するように、制御情報を無線基地
局へ送り、また受信レベルが低いときには無線基
地局の送信出力を増加するように、制御情報を無
線基地局に送る。
FIG. 2 is a graph showing the relationship of transmission output control. In other words, as shown in the figure, for example, a mobile station monitors the reception level of a call signal from a wireless base station, and when the level is high, transmits control information to the wireless base station so as to reduce the transmission output of the wireless base station. control information is also sent to the radio base station to increase the transmission power of the radio base station when the reception level is low.

このようにして、必要な通話品質を保持しなが
ら、送信出力が必要以上に過大になるのを阻止す
ることによつて、他の小無線ゾーンに対する干渉
の発生する確率の低減を図つている。
In this way, the probability of interference with other small wireless zones is reduced by preventing the transmission output from becoming more excessive than necessary while maintaining the necessary speech quality.

第3図は、従来の基地局と移動局の構成例を示
すブロツク図である。同図において、31,3
1′は空中線、32,32′は送受共用器、33,
33′は周波数シンセサイザ部、34,34′は送
信部、35,35′は受信部、36,36′は制御
部、37,37′は受信レベル検出部、38,3
8′は干渉レベル検出部、39,39′は音声入力
端子、40,40′は音声出力端子、である。制
御部36,36′はCPU,ROM,RAM等のハー
ド部と制御用ソフトウエア部で構成されている。
FIG. 3 is a block diagram showing an example of the configuration of a conventional base station and mobile station. In the same figure, 31,3
1' is an antenna, 32, 32' is a duplexer, 33,
33' is a frequency synthesizer section, 34, 34' are transmitting sections, 35, 35' are receiving sections, 36, 36' are control sections, 37, 37' are reception level detection sections, 38, 3
8' is an interference level detection section, 39, 39' are audio input terminals, and 40, 40' are audio output terminals. The control units 36 and 36' are composed of hardware units such as a CPU, ROM, and RAM, and a control software unit.

第4図は従来の移動通信方法における送信出力
制御動作を示す流れ図、第5図は同じくチヤネル
干渉検出動作を示す流れ図である。
FIG. 4 is a flow chart showing a transmission output control operation in a conventional mobile communication method, and FIG. 5 is a flow chart showing a channel interference detection operation.

先ず第3図、第4図を参照して送信出力制御動
作を説明する。
First, the transmission output control operation will be explained with reference to FIGS. 3 and 4.

基地局3の側に立つて考えると、制御部36
は、空中線31、送受共用器32、受信部35、
受信レベル検出部37を介して、移動局4側から
送信されてきた信号の受信レベルを、ステツプ
において、それが所定値以上あるか否か判断し、
ある場合にはステツプへ進んで、移動局4にお
ける送信出力を減少させるように、送信部34、
送受共用器32、空中線31を介して通話中デー
タを利用して制御情報を送り、所定値以上ない場
合にはステツプへ進んで同様にして、移動局4
における送信出力を増加させるように制御情報を
送る。
From the perspective of the base station 3, the control unit 36
is an antenna 31, a duplexer 32, a receiving section 35,
In step, the reception level of the signal transmitted from the mobile station 4 side is determined via the reception level detection unit 37 whether or not it is equal to or higher than a predetermined value.
In such a case, proceeding to step, the transmitting section 34,
Control information is sent via the duplexer 32 and the antenna 31 using the data during the call, and if the data is less than a predetermined value, the process advances to step 4 and the mobile station 4
Send control information to increase the transmission power at.

次に第3図、第5図を参照してチヤネル干渉検
出動作を説明する。
Next, the channel interference detection operation will be explained with reference to FIGS. 3 and 5.

同じく基地局3の側に立つて考える。制御部3
6は、空中線31、送受共用器32、受信部3
5、干渉レベル検出部38を介して、移動局4側
から送信されてくる信号の受信波のD/U比が良
好か否かをステツプにおいて判断し、良好であ
れば問題ないが、否(つまりチヤネル干渉あり)
のときは、ステツプへ進んで、送信部34、送
受共用器32、空中線31を介して移動局4へ通
話中チヤネルの切替を指令する。
Similarly, think from the side of base station 3. Control part 3
6 is an antenna 31, a duplexer 32, and a receiving section 3;
5. It is determined in step whether or not the D/U ratio of the received wave of the signal transmitted from the mobile station 4 side is good through the interference level detection unit 38. If it is good, there is no problem; In other words, there is channel interference)
In this case, the process advances to step 3 and instructs the mobile station 4 via the transmitter 34, duplexer 32, and antenna 31 to switch the channel in use.

他方、移動局4の側で受信波のD/U比が良好
でないと判断したときは、同様にして今度は基地
局3に対して通話中チヤネルの切替要求を送る。
On the other hand, when the mobile station 4 side determines that the D/U ratio of the received waves is not good, it similarly sends a request to switch the busy channel to the base station 3.

なお第8図は、第3図における干渉レベル検出
部38,38′の具体例を示すブロツク図である。
第8図において、381は包絡線検波回路、38
2はA/D変換器、383はA/D変換器、
384は演算器、である。
Note that FIG. 8 is a block diagram showing a specific example of the interference level detection sections 38, 38' in FIG. 3.
In FIG. 8, 381 is an envelope detection circuit;
2 is an A/D converter, 383 is an A/D converter,
384 is an arithmetic unit.

第8図を参照してD/U比検出(干渉量測定)
の動作原理を簡単に説明する。この測定原理は、
受信機の中間周波出力を2乗検波すると、低周波
成分(ほぼDC成分)としてD波とU波各振幅の
2乗和が現れ、高周波成分(ビート成分)として
D波とU波各振幅の積に比例する成分が現れるこ
とから、両者を演算することにより、D/U比が
求まるというものである。
Referring to Figure 8, D/U ratio detection (interference amount measurement)
The operating principle will be briefly explained. This measurement principle is
When the intermediate frequency output of the receiver is square-law detected, the sum of the squares of the D and U wave amplitudes appears as a low frequency component (almost a DC component), and the sum of the squares of the D and U wave amplitudes appears as a high frequency component (beat component). Since a component proportional to the product appears, the D/U ratio can be found by calculating both.

さて第8図において、受信部における受信波の
包絡線検波出力を2台のA/D変換器と38
2,383によりサンプリングした後、低周波成
分と高周波成分を求めて演算処理することにより
干渉量D/U比を求めることができる。ここで
A/D変換器との違いは、サンプリング周期
の差によるものである。
Now, in Fig. 8, the envelope detection output of the received wave in the receiver is detected by two A/D converters and a
After sampling by 2,383, the interference amount D/U ratio can be determined by calculating and processing the low frequency components and high frequency components. Here, the difference from the A/D converter is due to the difference in sampling period.

具体的には、包絡線検波出力をR(t)とすると、 R(t)=E1 2(t)+E2 2(t) +2E1(t)・E2(t)cosψ(t) と表される。ここでE1(t)はD波振幅であり、E2
(t)はU波振幅である。またψ(t)はD波とU波のキ
ヤリアの周波数差である。
Specifically, if the envelope detection output is R(t), then R(t)=E 1 2 (t)+E 2 2 (t) +2E 1 (t)・E 2 (t)cosψ(t) expressed. Here, E 1 (t) is the D wave amplitude, and E 2
(t) is the U wave amplitude. Further, ψ(t) is the carrier frequency difference between the D wave and the U wave.

サンプリング周期がt,t+Δtの2つのA/
D変換器382,383によりサンプリングし、
その結果を処理することにより 低周波成分E1 2(t)+E2 2(t) 高周波成分E1(t)・E2(t) を求めることができる。これらの値よりD/U比
(E1 2/E2 2)を演算により求めることができる。
(ここで、D/U比の測定方法を示した文献は幾
つかあるが、その一つとして、小園、石川「ビー
ト現象を利用した同一周波干渉量検出の検討」電
子通信学会 技術研究報告CS−13,1983年4月
を挙げることができるので、必要があれば参照さ
れたい)。
Two A/s with sampling periods t and t+Δt
Sampled by D converters 382 and 383,
By processing the results, it is possible to obtain the low frequency component E 1 2 (t) + E 2 2 (t) and the high frequency component E 1 (t)·E 2 (t). From these values, the D/U ratio (E 1 2 /E 2 2 ) can be calculated.
(Here, there are several documents that show how to measure the D/U ratio, but one of them is Kozono, Ishikawa "Study of co-frequency interference detection using beat phenomenon" Institute of Electronics and Communication Engineers Technical Research Report CS -13, April 1983, so please refer to it if necessary).

以上説明したように、従来の移動通信方法にお
いては、小無線ゾーンにおいて基地局と移動局の
間で相互に送信出力制御を実施して、他の小無線
ゾーンに対するチヤネル干渉が発生しないように
配慮しているが、一旦、他の小無線ゾーンからチ
ヤネル干渉を受けたとなると(つまり受信波の
D/U比が良好でなくなつたと判断すると)、直
ちに通話中チヤネルの切替動作に移行し、干渉チ
ヤネルの使用を避けることによつて干渉から退避
していた。
As explained above, in conventional mobile communication methods, base stations and mobile stations mutually control transmission output in small wireless zones to prevent channel interference with other small wireless zones. However, once it receives channel interference from another small wireless zone (in other words, it determines that the D/U ratio of the received wave is no longer good), it immediately switches to the active channel and eliminates the interference. Interference was avoided by avoiding the use of channels.

このため、従来の移動通信方法においては、干
渉発生に伴うチヤネル切替頻度が増加し、チヤネ
ル切替時に発生する切替雑音によつて通話品質が
劣化し、しかも干渉発生チヤネルはそのまま残つ
て累積するのでチヤネルの有効利用が図れないと
いう欠点があつた。
For this reason, in conventional mobile communication methods, the frequency of channel switching increases due to the occurrence of interference, and the communication quality deteriorates due to the switching noise that occurs when switching channels.Moreover, the channels where interference remains and accumulates, so the channel switching frequency increases due to the occurrence of interference. The drawback was that it was not possible to utilize the resources effectively.

〔発明の目的〕[Purpose of the invention]

本発明は、上述のような従来技術の欠点を除去
するためになされたものであり、従つて本発明の
目的は、干渉発生に伴うチヤネル切替頻度の軽減
を図り、通話品質を良好にし、干渉発生チヤネル
の累積を少なくすることのできる移動通信方法を
提供することにある。
The present invention has been made to eliminate the drawbacks of the prior art as described above, and therefore, an object of the present invention is to reduce the frequency of channel switching due to the occurrence of interference, improve call quality, and eliminate interference. An object of the present invention is to provide a mobile communication method that can reduce the accumulation of generated channels.

〔発明の概要〕[Summary of the invention]

本発明の要点は、送信出力制御を実施している
移動送信方法において、他の小無線ゾーンからチ
ヤネル干渉を受けたとき(つまり受信波のD/U
比が良好でなくなつたと判断されたとき)、直ち
に通話中チヤネルの切替動作へ移行するのでな
く、送信出力制御手段を利用して、今度は受信波
のD/U比が改善するまで相手局の送信出力を増
加させ、相手局の送信出力がその最大限度に達し
ても、なおD/U比が改善されないときに限つ
て、通話中チヤネルの切替動作へ移行するように
した点にある。
The main point of the present invention is that in a mobile transmission method that implements transmission output control, when channel interference is received from other small radio zones (that is, D/U of received waves
(when it is determined that the D/U ratio is no longer good), instead of immediately switching to the active channel, the transmission output control means is used to switch the other party's station until the D/U ratio of the received waves improves. Even when the transmission output of the other station reaches its maximum limit, only when the D/U ratio is still not improved, the switching operation of the busy channel is made.

第6図は、上述のような本発明の動作原理を示
す空間ベクトル図である。同図において、X軸方
向にD/U比を、Y軸方向に受信レベルを、Z軸
方向に相手局送信出力を、それぞれとつている。
FIG. 6 is a space vector diagram showing the operating principle of the present invention as described above. In the figure, the D/U ratio is plotted in the X-axis direction, the reception level is plotted in the Y-axis direction, and the transmission output of the other station is plotted in the Z-axis direction.

第6図において、D/U比が所定値以上ある場
合(つまりチヤネル干渉が発生していない場合)
は、第2図を参照して先に説明した通り(つまり
従来通り)、受信レベルの増減に応じて相手局の
送信出力を減増させる送信出力制御が行なわれる
ので、この場合の受信レベルと相手局送信出力と
D/U比の関係は、第6図において、(2−6−
8−7−2)の斜面によつて規定されることにな
る。
In Figure 6, when the D/U ratio is greater than a predetermined value (that is, when channel interference does not occur)
As explained earlier with reference to FIG. 2 (that is, conventionally), transmission output control is performed to decrease or increase the transmission output of the other station according to the increase or decrease in the reception level, so the reception level in this case is The relationship between the transmission output of the other station and the D/U ratio is shown in Figure 6 as (2-6-
8-7-2).

次にD/U比が所定値以下になり、チヤネル干
渉が発生したと判断される場合には、本発明では
相手局の送信出力をD/U比が改善されるまで限
度いつぱい増加させるわけであるから、このとき
の受信レベルと相手局送信出力とD/U比の関係
は、第6図において、D/U比が改善されるまで
は、(1−3−5−6−4−2)で定まる空間に
より規定される関係にあり、D/U比が所定値以
上に改善された時点では、(2−4−6−8−7
−9)で定まる空間により規定される関係にあ
る。
Next, when the D/U ratio falls below a predetermined value and it is determined that channel interference has occurred, the present invention increases the transmission output of the other station to the maximum limit until the D/U ratio is improved. Therefore, the relationship between the reception level, the transmission output of the other station, and the D/U ratio at this time is (1-3-5-6-4- 2), and when the D/U ratio is improved to a predetermined value or more, (2-4-6-8-7
The relationship is defined by the space defined by -9).

相手局の送信出力を限度いつぱいに上げても
D/U比が改善されない状態になつたら、通話中
チヤネルの切替動作に移行するわけであるが、こ
の状態というのは、第6図において、(1−2−
4−3)で定まる平面に相当する。
When the D/U ratio does not improve even if the transmission output of the other station is increased to the maximum limit, the operation shifts to switching the active channel, and this state is defined as ( 1-2-
This corresponds to the plane determined by 4-3).

〔発明の実施例〕[Embodiments of the invention]

次に図を参照して本発明の一実施例を説明す
る。
Next, an embodiment of the present invention will be described with reference to the drawings.

第7図は本発明の一実施例の動作を示す流れ図
である。なお、本発明を実施した場合のハードウ
エアの構成そのものは、ブロツク図としては第3
図のそれと変らないので、以下、第3図、第7図
を参照して動作を説明する。
FIG. 7 is a flowchart showing the operation of one embodiment of the present invention. The hardware configuration itself when implementing the present invention is shown in the third block diagram.
Since the operation is the same as that shown in the figure, the operation will be explained below with reference to FIGS. 3 and 7.

基地局3の側に立つて説明する。制御部36
は、ステツプにおいて、干渉レベル検出部38
からの出力により受信波のD/U比が所定値以上
あるか否か判断し、ありの場合には、ステツプ
に進み、制御部内のD/U比劣化フラグビツト
(これについては後述)がセツトされているか否
かを調べ、否ならばステツプに進み、受信レベ
ル検出部37からの出力によつて受信レベルが所
定値以上か否かを判断し、以上ならステツプ
へ、否ならばステツプに進んで送信出力制御を
行なう。
I will explain from the perspective of the base station 3. Control unit 36
In the step, the interference level detection section 38
It is determined whether the D/U ratio of the received wave is equal to or higher than a predetermined value based on the output from the controller, and if yes, the process proceeds to step and a D/U ratio deterioration flag bit (described later) in the control section is set. It is checked whether the reception level is equal to or higher than the predetermined value, and if not, the process proceeds to step. Based on the output from the reception level detector 37, it is determined whether the reception level is above a predetermined value. If it is above, the process proceeds to step. Performs transmission output control.

ステツプにおいて、受信波のD/U比が所定
値以上にはないと制御部36が判断したときは、
ステツプに進んで制御部内のD/U比劣化フラ
グビツトをセツトし、続いてステツプに進み、
相手局の送信出力が最大であるか否かを適宜の手
段を用いて判断し、否であればステツプへ進
み、最大であればステツプへ進んで通話中チヤ
ネルの切替動作に移行すると共に、前記のフラグ
ビツトをリセツトする。
In step, when the control unit 36 determines that the D/U ratio of the received wave is not higher than the predetermined value,
Proceed to step and set the D/U ratio deterioration flag bit in the control section, then proceed to step,
It is determined by appropriate means whether or not the transmission output of the other station is at its maximum. If not, the process proceeds to step; if it is maximum, the process proceeds to step to switch the channel in use, and at the same time resets the flag bits.

ステツプは、一度D/U比が劣化してフラグ
ビツトがセツトされた後は、その後D/U比が改
善され良好になつても、相手局の送信出力制御
(ステツプ,,)は行なわないようにする
ために設けたものである。
The steps are such that once the D/U ratio deteriorates and the flag bit is set, the transmission output control (steps, etc.) of the other station will not be performed even if the D/U ratio improves and becomes better. It was established for the purpose of

このように、本発明では、送信出力制御時に他
の小無線ゾーンからの干渉が発生しても、すぐチ
ヤネル切替によりそのチヤネルから退避するので
はなく、極力そのチヤネルを保持して、相手局の
送信出力を増加させ、それが最大になつても干渉
がなくならない時のみチヤネル切替を行うので、
チヤネル切替の頻度を少なくできるわけである。
In this way, in the present invention, even if interference occurs from another small wireless zone during transmission output control, instead of immediately switching channels and evacuating from that channel, the present invention maintains the channel as much as possible and allows the other station to receive interference. Channel switching is performed only when interference does not disappear even after increasing the transmitting power to the maximum.
This means that the frequency of channel switching can be reduced.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、チヤネル
切替の頻度を低減できるのであるから、チヤネル
切替時に発生する切替雑音も低減でき、それによ
つて通話品質の改善を図れるという利点、更に干
渉発生チヤネルの累積数を低減でき、結果として
チヤネルを有効に利用できるという利点がある。
As explained above, according to the present invention, since the frequency of channel switching can be reduced, the switching noise generated at the time of channel switching can also be reduced, which has the advantage of improving call quality. This has the advantage that the number of accumulations can be reduced and, as a result, channels can be used effectively.

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

第1図は移動通信方法における一般的な無線ゾ
ーン構成の概念を示した概念図、第2図は送信出
力制御の関係を示したグラフ、第3図は従来の基
地局と移動局の構成例を示すブロツク図、第4図
は従来の移動通信方法における送信出力制御動作
を示す流れ図、第5図は同じくチヤネル干渉検出
動作を示す流れ図、第6図は本発明の動作原理を
示す空間ベクトル図、第7図は本発明の一実施例
の動作を示す流れ図、第8図は干渉レベル検出部
の具体例を示すブロツク図、である。 符号説明、1……サービスエリア、2……小無
線ゾーン、3……無線基地局、4……移動局、3
1,31′……空中線、32,32′……送受共用
器、33,33′……周波数シンセサイザ部、3
4,34′……送信部、35,35′……受信部、
36,36′……従来の制御部、37,37′……
受信レベル検出部、38,38′……干渉レベル
検出部、39,39′……音声入力端子、40,
40′……音声出力端子。
Figure 1 is a conceptual diagram showing the concept of a general wireless zone configuration in a mobile communication method, Figure 2 is a graph showing the relationship between transmission output control, and Figure 3 is an example of the configuration of a conventional base station and mobile station. FIG. 4 is a flowchart showing the transmission output control operation in a conventional mobile communication method, FIG. 5 is a flowchart showing the channel interference detection operation, and FIG. 6 is a space vector diagram showing the operating principle of the present invention. , FIG. 7 is a flowchart showing the operation of one embodiment of the present invention, and FIG. 8 is a block diagram showing a specific example of the interference level detection section. Code explanation, 1...Service area, 2...Small wireless zone, 3...Wireless base station, 4...Mobile station, 3
1, 31'... Antenna, 32, 32'... Dual transmitter/receiver, 33, 33'... Frequency synthesizer section, 3
4, 34'... transmitting section, 35, 35'... receiving section,
36, 36'... Conventional control section, 37, 37'...
Reception level detection section, 38, 38'... Interference level detection section, 39, 39'... Audio input terminal, 40,
40'...Audio output terminal.

Claims (1)

【特許請求の範囲】 1 サービスエリアを構成する複数個の無線ゾー
ンの中に、同じ無線チヤネルを用いる無線ゾーン
が混在し、各無線ゾーンでは、基地局と移動局と
の間で通話状態にあり、かつその際、希望波受信
レベルDと干渉波受信レベルUとの比であるD/
U比が、それぞれの局において、所定値以上であ
るとき、それぞれの局は、互いに通話信号の受信
レベルを監視しそれが所定レベルになるように相
手局の送信出力を制御するようにした移動通信方
法において、 或る無線ゾーンにおける基地局または移動局
が、同じ無線チヤネルを用いる他の無線ゾーンか
らのチヤネル干渉に起因して、前記D/U比が前
記所定値以下に劣化したとき、それぞれの局は、
前記の相手局送信出力の所定レベルへの制御を中
止して、前記D/U比が前記所定値に回復するま
で相手局の送信出力を増加させる制御を行い、相
手局の送信出力が最大限度に達してもなお前記
D/U比が前記所定値に達しない場合に、通話チ
ヤネルの切替を実施するようにしたことを特徴と
する移動通信方法。
[Claims] 1. Among the plurality of wireless zones constituting a service area, there are wireless zones that use the same wireless channel, and in each wireless zone, there is a communication state between a base station and a mobile station. , and in that case, D/ which is the ratio between the desired wave reception level D and the interference wave reception level U
When the U ratio is greater than or equal to a predetermined value in each station, each station monitors the reception level of each other's call signals and controls the transmission output of the other station so that the level reaches the predetermined level. In the communication method, when the D/U ratio of a base station or a mobile station in a certain wireless zone deteriorates to below the predetermined value due to channel interference from another wireless zone using the same wireless channel, The station is
Stopping the control of the transmission output of the other station to a predetermined level, and performing control to increase the transmission output of the other station until the D/U ratio recovers to the predetermined value, so that the transmission output of the other station reaches its maximum limit. 1. A mobile communication method, characterized in that when the D/U ratio still does not reach the predetermined value even after the D/U ratio reaches the predetermined value, the communication channel is switched.
JP59025162A 1984-02-15 1984-02-15 Mobile communication system Granted JPS60172838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59025162A JPS60172838A (en) 1984-02-15 1984-02-15 Mobile communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59025162A JPS60172838A (en) 1984-02-15 1984-02-15 Mobile communication system

Publications (2)

Publication Number Publication Date
JPS60172838A JPS60172838A (en) 1985-09-06
JPH0576813B2 true JPH0576813B2 (en) 1993-10-25

Family

ID=12158314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59025162A Granted JPS60172838A (en) 1984-02-15 1984-02-15 Mobile communication system

Country Status (1)

Country Link
JP (1) JPS60172838A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02192231A (en) * 1989-01-19 1990-07-30 Nippon Telegr & Teleph Corp <Ntt> Transmission power control system
JP2697885B2 (en) * 1989-02-23 1998-01-14 日本電信電話株式会社 Channel selection specification method
JPH0324735U (en) * 1989-07-21 1991-03-14
JPH08307335A (en) * 1995-05-02 1996-11-22 Nec Corp Radio channel deterioration informing system

Also Published As

Publication number Publication date
JPS60172838A (en) 1985-09-06

Similar Documents

Publication Publication Date Title
US7460877B2 (en) Uplink power control using received reference signal
US6236672B1 (en) Transmitting/receiving apparatus using a plurality of spreading codes
JP3192839B2 (en) How to determine initial transmit power
JP4020967B2 (en) Connection establishment method, subscriber terminal unit and radio system
JP4202932B2 (en) CDMA signal power estimation apparatus and method
JPH08237716A (en) Switching method based on channel characteristics
EP1535478B1 (en) Method and apparatus to reduce uplink compressed mode monitoring in a communication device
JPH09224276A (en) Method for selecting base station
JPH07107545A (en) Mobile communications system composed of sector cells
CN1256035A (en) Interference-free radio communication system
JP2000232329A (en) Automatic gain control for receiver and its method
EP0818090A1 (en) Method and apparatus for maintaining call quality in a communication system
JPH0576813B2 (en)
JPH056812B2 (en)
JPS6328145A (en) Radio communication system
JPH0226895B2 (en)
JP3086548B2 (en) Digital mobile phone equipment
EP0957593A2 (en) Mobile communication system and method of controlling transmitted power from base station in mobile communication system
JPH03293825A (en) Diversity receiver
JP2000068870A (en) Receiver preventing intermodulation and reception method
JPH02192231A (en) Transmission power control system
JP2001157271A (en) Device for receiving signal with specific signal strength and its method
JP2833591B2 (en) Interference mitigation in mobile radio communication systems.
JP2677238B2 (en) Channel assignment processing method
JPH07284156A (en) Peripheral reception station equipment for mobile communication