JPH08167872A - Mobile radio communication system and power controlling method - Google Patents
Mobile radio communication system and power controlling methodInfo
- Publication number
- JPH08167872A JPH08167872A JP6310191A JP31019194A JPH08167872A JP H08167872 A JPH08167872 A JP H08167872A JP 6310191 A JP6310191 A JP 6310191A JP 31019194 A JP31019194 A JP 31019194A JP H08167872 A JPH08167872 A JP H08167872A
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- field strength
- mobile device
- value
- base 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動無線通信システムに
関し、更に詳しくは、自動車電話あるいは携帯電話等の
移動機のための電力制御方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication system, and more particularly to a power control system for a mobile device such as a car phone or a mobile phone.
【０００２】[0002]
【従来の技術】移動無線通信システムでは、移動機と基
地局と位置関係によって相互の受信電力が変化するた
め、安定した通信を行うために送信電力制御が必要とな
る。移動機の送信電力制御に関する従来技術として、例
えば、財団法人電波システム開発センタ発行の「デジタ
ル方式自動車電話システム標準規格」ＲＣＲ ＳＴＤ−
２７（平成３年４月３０日発行）の第８４頁には、通信
状態にある移動機の送信電力を基地局の指令によって制
御する方式が開示されている。2. Description of the Related Art In a mobile radio communication system, the mutual reception power of a mobile device and a base station changes depending on the positional relationship, so that transmission power control is necessary for stable communication. As a conventional technique relating to transmission power control of a mobile device, for example, "Digital Car Phone System Standard" RCR STD- issued by the Radio Wave System Development Center
On page 84 of 27 (issued April 30, 1991), a method is disclosed in which the transmission power of a mobile device in communication is controlled by a command from a base station.
【０００３】図９は、上記文献に示された移動機の電力
制御に関する部分をブロック図として具体化して示した
ものであり、１００は基地局、２００は移動機を示す。
移動機２００において、空中線２０２にから受信した基
地局の電波は、１つの空中線を送受信機で共用するため
に設けられた送受信分波器２０４を介して、受信機２０
６に入力される。２０８は、受信機で受信された基地局
電波の電界強度を検出する電界強度検出回路であり、検
出された電界強度は平均値計算回路２１８に入力され
る。平均値計算回路２１８は、複数スロット分の受信電
界強度の平均値を算出する。電界強度の平均値を示す情
報は、符号器２１０によって符号化され、送信機２１２
で移動機識別情報と共に搬送波に乗せられ、送受信分波
器２０４を経由して空中線２０２から基地局１００に送
信される。FIG. 9 is a block diagram concretely showing a portion relating to power control of a mobile device shown in the above-mentioned document, in which 100 is a base station and 200 is a mobile device.
In the mobile device 200, the radio wave of the base station received from the antenna 202 is transmitted to the receiver 20 via the transmission / reception demultiplexer 204 provided for sharing one antenna with the transmitter / receiver.
6 is input. Reference numeral 208 denotes an electric field strength detection circuit that detects the electric field strength of the radio wave of the base station received by the receiver, and the detected electric field strength is input to the average value calculation circuit 218. The average value calculation circuit 218 calculates the average value of the received electric field strengths for a plurality of slots. The information indicating the average value of the electric field strength is encoded by the encoder 210 and transmitted by the transmitter 212.
At the same time, it is placed on a carrier together with mobile unit identification information, and transmitted from the antenna 202 to the base station 100 via the transmission / reception demultiplexer 204.
【０００４】基地局１００では、空中線１０２からの受
信電波を送受信分波器１０４を介して受信機１０６に入
力する。受信機１０６の入力信号のうち、移動機２００
が送信した上記電界強度情報は、復号器１０８により復
号され、送信電力決定回路１１０に入力される。送信電
力決定回路１１０は、受信電界強度情報に応じて該当移
動機の送信電力を決定し、電力制御データを移動機識別
情報と共に電力制御回路１１４と符号器に出力する。電
力制御回路１１４は、上記電力制御データに応じて、送
信機１１６における上記移動機用の送信出力を制御す
る。符号器１１２は、移動機２００に対する電力制御信
号を生成し、この電力制御信号は、送信機１１６によっ
て搬送波に乗せられ、送受信分波器１０４、空中線１０
２を介して移動機２００に送出される。In the base station 100, the received radio wave from the antenna 102 is input to the receiver 106 via the transmission / reception duplexer 104. Of the input signals of the receiver 106, the mobile device 200
The electric field strength information transmitted by is decoded by the decoder 108 and input to the transmission power determination circuit 110. The transmission power determination circuit 110 determines the transmission power of the corresponding mobile device according to the received electric field strength information, and outputs the power control data to the power control circuit 114 and the encoder together with the mobile device identification information. The power control circuit 114 controls the transmission output for the mobile device in the transmitter 116 according to the power control data. The encoder 112 generates a power control signal for the mobile device 200, and the power control signal is put on a carrier wave by the transmitter 116, and the transmitter / receiver duplexer 104 and the antenna 10 are used.
2 to the mobile device 200.
【０００５】移動機２００は、基地局が送信した上記電
力制御信号を受信すると、これを受信機２０６から復号
器２１４に入力する。復号器２１４で復号された電力御
情報は、電力制御回路２１６に入力され、これによって
送信機２１２の送信出力が制御される。When mobile station 200 receives the power control signal transmitted from the base station, mobile station 200 inputs it from receiver 206 to decoder 214. The power control information decoded by the decoder 214 is input to the power control circuit 216, which controls the transmission output of the transmitter 212.
【０００６】上記文献では、基地局１００における送信
電力決定回路１１０の具体的な構成や、送信出力制御特
性に関して詳述されていないが、上記送信電力決定回路
１１０は、移動機からの受信電界強度が高ければ、移動
機の送信出力が小さくなるように、また、受信電界強度
が低ければ、移動機の送信出力が大きくなるように電力
制御信号を発生する必要がある。Although the above-mentioned document does not describe in detail the specific configuration of the transmission power determination circuit 110 in the base station 100 and the transmission output control characteristic, the transmission power determination circuit 110 does not include the reception electric field strength from the mobile unit. The power control signal needs to be generated so that the transmission output of the mobile device becomes smaller when the value is higher, and the transmission output of the mobile device becomes larger when the received electric field strength is lower.
【０００７】[0007]
【発明が解決しようとする課題】移動無線通信システム
においては、移動機の環境によって移動機の移動に伴っ
てフェージングが発生し、受信電界強度が大きく変動す
る。上述した従来の電力制御方式においても、所謂フェ
ージングマージンを設けることによって、移動機と基地
局との間の無線チャネルを常に通信可能な状態に保つこ
とができる。例えば、基地局１００において、移動機か
ら受信した受信電界強度情報に基づいて理論的に算出さ
れる送信電力制御量に、フェージングによる低下分を補
うためのマージンを与えておくことによって、基地局と
移動機の送信電力が常時高めに設定されるようにすれば
よい。In the mobile radio communication system, fading occurs due to the movement of the mobile unit depending on the environment of the mobile unit, and the received electric field strength greatly fluctuates. Also in the above-described conventional power control method, by providing a so-called fading margin, the wireless channel between the mobile device and the base station can be always kept in a communicable state. For example, in the base station 100, the transmission power control amount theoretically calculated based on the received electric field strength information received from the mobile device is provided with a margin for compensating for a decrease due to fading, so that The transmission power of the mobile device may be constantly set to a high value.
【０００８】しかしながら、送信電力を常に高めに設定
すると、移動機の移動量が少なく、フェージングが発生
しない状態において、フェージングマージンに相当した
必要以上の送信電力が消費される結果、移動機の電源寿
命が短かくなるという問題がある。However, if the transmission power is always set to a high value, more than the required transmission power corresponding to the fading margin is consumed in a state where the moving amount of the mobile device is small and fading does not occur, resulting in the power supply life of the mobile device. There is a problem that becomes short.
【０００９】上記フェージングマージンを設ける代わり
に、フェージング周期よりも短い周期で移動機から基地
局に電力制御信号を送信し、こまめに電力制御する方式
も考えられるが、この方式は各種の制約から実現が困難
である。例えば、現在の日本のデジタル自動車電話シス
テムにおいては、基地局からの電力制御信号は、ハウス
キーピング信号として送信される。フルレート方式の場
合、上記電力制御信号がスーパフレーム毎に送出される
ため、送出周期は７２０ｍｓ（約１．４Ｈｚ）となる
（前記「デジタル方式自動車電話システム標準規格」の
第３４頁）。移動機側も、電界強度情報に送信にハウス
キーピング信号を用いるため、約０.７Ｈｚ程度のフェ
ージングであれば、それに追従した電力制御が可能であ
る。Instead of providing the above fading margin, there may be a method in which a power control signal is transmitted from a mobile station to a base station at a cycle shorter than the fading cycle, and power is frequently controlled, but this method is realized due to various restrictions. Is difficult. For example, in the current Japanese digital car telephone system, the power control signal from the base station is transmitted as a housekeeping signal. In the case of the full rate system, since the power control signal is transmitted in each superframe, the transmission cycle is 720 ms (about 1.4 Hz) (page 34 of the above-mentioned "digital system mobile telephone system standard"). Since the housekeeping signal is also used for transmitting the electric field strength information on the mobile unit side, it is possible to perform power control following the fading of about 0.7 Hz if the fading is about 0.7 Hz.
【００１０】しかしながら、デジタル方式の自動車電話
システムで用いられる送信周波数のうち１．５ＧＨｚ帯
を使用した場合、移動機の移動速度が５０ｋｍ／ｈにな
ると、フェージング周波数は約７０Ｈｚとなってしまう
ため、上記ハウスキーピング信号を用いた電力制御方式
ではフェージングに充分に追従することができない。以
上の理由から、移動機が高速移動した場合にも安定した
通信を保証するためには、前述のフェージングマージン
を設ける方式の方が実用的である。図２は、基地局１０
０で観測される移動機２００からの送信電波の受信電界
強度（３００、３０２）と、受信電界強度が最低許容レ
ベル（最低受信可能電界強度）３０４との関係を示す。
フェージングマージンを設ける方式では、図２に示すよ
うに、フェージングが生じた場合でも、受信電界強度が
常に最低受信可能電界強度３０４よりも高くなるように
送信電力を設定する。フェージングの深さは周囲の状況
によって異なるため、送信電力は、細い曲線３００で示
すように深いフェージングが発生した場合でも、受信電
界強度が最低許容レベル３０４を大きく下回らないよう
にマージンを与えておく必要がある。However, when the 1.5 GHz band of the transmission frequency used in the digital car telephone system is used, the fading frequency becomes about 70 Hz when the moving speed of the mobile device becomes 50 km / h. The power control method using the housekeeping signal cannot sufficiently follow fading. For the above reason, in order to guarantee stable communication even when the mobile device moves at a high speed, it is more practical to use the above-mentioned system with the fading margin. FIG. 2 shows the base station 10
The relationship between the received electric field strength (300, 302) of the radio wave transmitted from the mobile device 200 observed at 0 and the minimum allowable electric field strength (minimum receivable electric field strength) 304 is shown.
In the method of providing the fading margin, as shown in FIG. 2, the transmission power is set such that the reception electric field strength is always higher than the minimum receivable electric field strength 304 even when fading occurs. Since the depth of fading varies depending on the surrounding conditions, the transmission power is provided with a margin so that the received electric field strength does not fall significantly below the minimum allowable level 304 even when deep fading occurs as shown by the thin curve 300. There is a need.
【００１１】従来の制御方式によれば、フェージングの
大小に関係なく、送信電力に与えるマージンが一定にな
っていたため、太い曲線３０２に示すようにフェージン
グが浅い場合には、結果的に、最低許容レベル３０４よ
りも必要以上に高い送信電力で通信が行われている。こ
のため、特に、電池を電源とする移動機２００側での無
駄な電力消費が問題になる。なお、図２に示したフェー
ジング時の受信電界強度と最低許容レベルとの関係は、
移動機側にも共通する現象である。According to the conventional control method, the margin given to the transmission power is constant regardless of the magnitude of fading. Therefore, when the fading is shallow as shown by the thick curve 302, the minimum allowable result is obtained. Communication is performed with a transmission power higher than necessary than the level 304. Therefore, in particular, useless power consumption on the side of the mobile device 200 that uses a battery as a power source becomes a problem. The relationship between the received electric field strength during fading and the minimum allowable level shown in FIG.
This phenomenon is common to mobile devices.
【００１２】本発明の目的は、移動無線通信システムに
おける移動機の消費電力低減効果の大きい電力制御方法
を提供することにある。An object of the present invention is to provide a power control method having a great effect of reducing power consumption of a mobile device in a mobile radio communication system.
【００１３】本発明の他の目的は、深いフェージングが
発生した場合でも安定に通信でき、フェージングが浅い
ときには消費電力を低減できる無線通信システム、およ
びその構成機器を提供することにある。Another object of the present invention is to provide a wireless communication system capable of performing stable communication even when deep fading occurs and reducing power consumption when the fading is shallow, and a component device thereof.
【００１４】[0014]
【課題を解決するための手段】上記目的を達成するため
に、本発明の移動無線通信システムおよび電力制御方法
では、移動機毎の受信電波の電界強度とフェージング量
とに応じて各移動機の送信電力を制御するようにしたこ
とを特徴とする。更に詳述すると、本発明は、基地局と
少なくと１つの移動機とからなる移動無線通信システム
において、移動機における受信電波の電界強度と変動量
とを測定し、上記変動量に応じて補正した電界強度の値
に基づいて、移動機の送信電力を制御するようにしたこ
とを特徴とする。In order to achieve the above object, in a mobile radio communication system and power control method of the present invention, a mobile radio communication system and a power control method according to the present invention are applied to each mobile device in accordance with the electric field strength of received radio waves and the fading amount. It is characterized in that the transmission power is controlled. More specifically, according to the present invention, in a mobile radio communication system consisting of a base station and at least one mobile unit, the electric field strength and fluctuation amount of a received radio wave in the mobile unit are measured and corrected according to the fluctuation amount. It is characterized in that the transmission power of the mobile device is controlled based on the value of the electric field strength.
【００１５】上記受信電波の電界強度と変動量の測定と
前記電界強度値の補正は、例えば、移動機側で行い、補
正された電界強度値を移動機から基地局に通知し、基地
局が、上記補正された電界強度値に応じて、上記移動機
と通信するための送信電力制御および上記移動機に対す
る電力制御信号の送信動作を行い、移動機が上記基地局
から受信した電力制御信号に従って送信電力を制御する
ようにすればよい。また、上記受信電波の電界強度と変
動量の測定を移動機側で行い、これらの値を移動機から
基地局に通知し、基地局が、移動機から受信した上記電
界強度と変動量の値に基づいて電界強度値の補正を行
い、該補正された電界強度値に応じて、上記移動機と通
信するための送信電力制御および上記移動機に対する電
力制御信号の送信動作を行い、移動機が上記基地局から
受信した電力制御信号に従って送信電力を制御するよう
にしてもよい。更に他の変形例として、基地局が、移動
機対応に受信電波の電界強度と変動量とを測定し、上記
変動量に応じて補正した電界強度の値に基づいて各移動
機に送信電力制御指令を与えるようにしてもよい。The measurement of the electric field strength and fluctuation amount of the received radio wave and the correction of the electric field strength value are carried out, for example, on the mobile unit side, and the corrected electric field strength value is notified from the mobile unit to the base station. According to the corrected electric field strength value, transmission power control for communicating with the mobile device and transmission operation of a power control signal for the mobile device are performed, and the mobile device follows the power control signal received from the base station. The transmission power may be controlled. In addition, the electric field strength and fluctuation amount of the received radio wave are measured on the mobile device side, these values are notified from the mobile device to the base station, and the base station receives the electric field strength and fluctuation amount value from the mobile device. The electric field strength value is corrected based on the electric field strength value, and according to the corrected electric field strength value, transmission power control for communicating with the mobile device and transmission operation of a power control signal to the mobile device are performed. The transmission power may be controlled according to the power control signal received from the base station. As still another modification, the base station measures the electric field strength and the variation amount of the received radio wave corresponding to the mobile device, and controls the transmission power to each mobile device based on the value of the electric field intensity corrected according to the variation amount. You may make it give a command.
【００１６】上記電界強度の補正は、受信電波の電界強
度が同じ場合、その変動量（フェージング）が小さくな
るに従って送信電力が低下するように行われる。また、
上記受信電波の電界強度は、例えば、所定期間内の電界
強度の平均値、上記変動量は、例えば、上記期間内にお
ける電界強度の標準偏差を適用できる。上記受信電波の
電界強度として、所定期間内に測定された電界強度の最
大値と最小値とから求まる平均値を適用し、上記変動量
として、上記最大値と最小値との差を適用してもよい。The correction of the electric field strength is performed so that, when the electric field strengths of the received radio waves are the same, the transmission power decreases as the fluctuation amount (fading) decreases. Also,
The electric field strength of the received radio wave may be, for example, an average value of the electric field strength within a predetermined period, and the variation may be the standard deviation of the electric field strength within the period. As the electric field strength of the received radio wave, an average value obtained from the maximum value and the minimum value of the electric field strength measured within a predetermined period is applied, and as the variation amount, the difference between the maximum value and the minimum value is applied. Good.
【００１７】[0017]
【作用】本発明によれば、受信電波電界強度の他に、電
界強度に変動量を考慮して送信電力制御を行うようにし
ているため、受信電界強度の平均値が略同一であって
も、フェージング量の大小によって送信電力を変えるこ
とができる。例えば、受信電界強度の変動量が所定値よ
り大きい場合、つまり、フェージングによる受信電界強
度の変動量が所定のフェージングマージンを超えた場合
は、移動機の送信出力が大きくなるように制御し、受信
電界強度の変動が小さい場合は、移動機の送信出力が小
さくなるように制御することによって、移動機における
消費電力を低減できる。According to the present invention, since the transmission power control is performed in consideration of the fluctuation amount in the electric field strength in addition to the electric field strength of the reception radio wave, even if the average value of the reception electric field strength is substantially the same. , The transmission power can be changed depending on the amount of fading. For example, if the fluctuation amount of the received electric field strength is larger than a predetermined value, that is, if the fluctuation amount of the received electric field strength due to fading exceeds a predetermined fading margin, control is performed so that the transmission output of the mobile device becomes large, and reception is performed. When the fluctuation of the electric field strength is small, the power consumption of the mobile device can be reduced by controlling the transmission output of the mobile device to be small.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面を参照して詳述
する。図３は、本発明による電力制御を実施した場合の
受信電界強度とフェージングとの関係を示す。本発明で
は、深いフェージングが発生して受信電波の電界強度が
大きく変動する期間中は、送信出力に所定のフェージン
グマージンを与えることによって、細い曲線３００で示
すように受信電界強度の平均レベルを上げ、フェージン
グの谷に相当する受信電界強度が、破線３０４で示す最
低許容レベル（最低受信可能電界強度）以下になること
が稀になるようにする。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 3 shows the relationship between the received electric field strength and fading when the power control according to the present invention is performed. According to the present invention, during the period in which the deep fading occurs and the electric field strength of the received radio wave fluctuates greatly, a predetermined fading margin is given to the transmission output to increase the average level of the received electric field strength as shown by a thin curve 300. , The reception electric field strength corresponding to the fading valley is rarely lower than the minimum allowable level (minimum receivable electric field strength) indicated by the broken line 304.
【００１９】また、フェージングが浅く、受信電界強度
の変動が小さい期間では、フェージングマージンを少な
くすることによって、太い曲線３０２で示すように受信
電界強度の平均レベルを下げ、最低許容レベル３０４に
近いレベルで受信動作が行われるようにする。基地局側
における受信電波がこのように変化するように移動機の
送信電力を制御することによって、フェージングが浅い
期間中の移動機の電力消費を抑え、電源の寿命を伸ばす
ことが可能となる。Further, during a period in which the fading is shallow and the fluctuation of the reception electric field strength is small, the fading margin is reduced to lower the average level of the reception electric field strength as shown by a thick curve 302, and the level close to the minimum allowable level 304. So that the receiving operation is performed. By controlling the transmission power of the mobile device so that the received radio waves on the base station side change in this way, it is possible to suppress the power consumption of the mobile device during the period when the fading is shallow and extend the life of the power supply.
【００２０】図４の（Ａ）は基地局と移動機との間の回
線利得の時間的変化、（Ｂ）はフェージングに応じて変
化する移動機送信電力の時間的変化、（Ｃ）は基地局で
観測される受信電界強度の時間的変化を示す。図（Ａ）
の曲線３０６で示すように、基地局と移動機の間の回線
利得の時間的変化が、期間３０８では高い利得が高い状
態で比較的安定し（フェージングが浅い状態）、期間３
１０で深いフェージングを起こし、期間３１２では低い
利得で再び比較的安定したと仮定する。FIG. 4A is a temporal change of the line gain between the base station and the mobile station, FIG. 4B is a temporal change of the transmission power of the mobile station which changes according to fading, and FIG. The temporal change of the received electric field strength observed at the station is shown. Figure (A)
As indicated by the curve 306 in FIG. 3, the temporal change in the line gain between the base station and the mobile station is relatively stable in the high gain state in the period 308 (the fading state is shallow), and the period 3
Assume deep fading at 10 and relatively stable again at low gain during period 312.
【００２１】従来の制御方式では、移動機の送信電力の
値は、専ら平均的回線利得に追従して制御されており、
図（Ｂ）に細い線３１６で示すように、フェージングが
浅い状態（期間３０８）から深い状態（期間３１０）に
推移した場合でも、回線利得の平均的なレベルが変わら
なければ、送信電力は一定に保たれている。これに対し
て、本発明では、図（Ｂ）に太い曲線３１８で示すよう
に、移動機の送信電力は、回線利得が大きい期間３０
８、３１０では回線利得が小さい期間３１２より低く、
且つ、回線利得が同程度であっても、フェージングの浅
い期間３０８では、フェージングの深い期間３１０より
も電力が更に低くなるように制御している。すなわち、
本発明では、回線利得の平均的な値とその安定性（フェ
ージングの状態）に応じて送信電力が変化するよう制御
されている。In the conventional control method, the value of the transmission power of the mobile device is controlled by following the average line gain exclusively.
As indicated by a thin line 316 in the figure (B), even when the fading changes from the shallow state (period 308) to the deep state (period 310), the transmission power is constant unless the average level of the line gain changes. Is kept at. On the other hand, in the present invention, as indicated by a thick curve 318 in FIG.
8 and 310 are lower than the period 312 when the line gain is small,
Moreover, even if the line gain is about the same, the power is controlled to be further lower in the shallow fading period 308 than in the deep fading period 310. That is,
In the present invention, the transmission power is controlled so as to change depending on the average value of the line gain and its stability (fading state).
【００２２】上述した移動機の送信電力変化を基地局側
の受信電界強度で見ると、本発明では、図（Ｃ）に太い
曲線３２４で示すように、フェージングの浅い期間３０
８、３１２では、受信電界強度の平均レベルが最低許容
レベル（最低受信可能電界強度）３２６に近い（マージ
ンの少ない）状態に保たれ、フェージングの深い期間３
１０では、フェージングの谷における受信電界強度が最
低許容レベル３２６となるように受信電界強度の平均レ
ベルを高くし、最低許容レベルに対するマージンを大き
くしある。従来の制御方式では、細い曲線３２２で示す
ように、回線利得が安定した期間３０８、３１２におい
て、フェージングに関係なく本発明よりも大きなマージ
ンをとっている。Looking at the above-mentioned change in transmission power of the mobile unit by the received electric field strength on the base station side, according to the present invention, as shown by a thick curve 324 in FIG.
In Nos. 8 and 312, the average level of the received electric field strength is kept close to the minimum permissible level (minimum receivable electric field strength) 326 (with a small margin), and the fading period 3
In No. 10, the average level of the received electric field strength is increased so that the received electric field strength at the fading valley becomes the minimum allowable level 326, and the margin for the minimum allowable level is increased. In the conventional control method, as shown by a thin curve 322, in the periods 308 and 312 in which the line gain is stable, the margin is larger than that of the present invention regardless of fading.
【００２３】図１は、本発明による無線通信システムに
おける基地局１００と移動機２００の主要部分の構成の
１例を示す。ここでは、簡単化のために、送信電力制御
に関わる部分のみを図示し、音声等の送受信データの処
理回路部分は、図面から省略してある。FIG. 1 shows an example of a configuration of main parts of a base station 100 and a mobile device 200 in a wireless communication system according to the present invention. Here, for simplification, only a portion related to transmission power control is shown, and a processing circuit portion for transmitting and receiving data such as voice is omitted from the drawing.
【００２４】移動機２００において、基地局からの電波
は空中線２０２で受信され、送受信分波器２０４を介し
て受信機２０６に入力される。受信電波の電界強度ｘ
（ｔ）（ｔはスロット毎に割り当てられる整数）が電界
強度検出回路２０８によって検出され、検出された電界
強度の値が代表値／変動値計算回路１に入力される。In the mobile device 200, the radio wave from the base station is received by the antenna 202 and input to the receiver 206 via the transmission / reception demultiplexer 204. Electric field strength of received radio wave x
(T) (t is an integer assigned to each slot) is detected by the electric field strength detection circuit 208, and the value of the detected electric field strength is input to the representative value / variation value calculation circuit 1.
【００２５】計算回路１は、新たな電界強度値の入力の
都度、これを含む過去複数スロット分の受信電界強度の
値から電界強度の代表値ｙ（例えば平均値、ｙ＝Σｘ
（ｔ）／ｎ、ｔ＝１、２、…ｎ）と、変動値σ（例えば
標準偏差、σ＝√｛（ｘ（１）−ｙ）2＋（ｘ（２）−
ｙ）2＋……＋（ｘ（ｎ）−ｙ）2｝／ｎ）とを求め、そ
れらの値を電界強度補正回路２に与える。Each time a new electric field strength value is input, the calculation circuit 1 calculates a representative value y (for example, an average value, y = Σx) of the electric field strength from the received electric field strength values for the past plural slots including the new electric field strength value.
(T) / n, t = 1, 2, ... N, and the variation value σ (for example, standard deviation, σ = √ {(x (1) -y) 2 + (x (2)-
y) 2 + ... + (x (n) -y) 2 } / n), and those values are given to the electric field strength correction circuit 2.
【００２６】補正回路２は、上記変動値σから定数値β
を減じた値に正の実数αを掛けた値（α（σ−β））を
上記代表値ｙから減算する。これによって補正された代
表値ｚ＝ｙ−α（σ−β）が得られ、この値ｚが、符号
器２１０によって符号化された後、移動機２００で検出
した受信電界強度を示す制御情報として、送信機２１
２、送受信分波器２０４、空中線２０２を介して基地局
１００に送信される。The correction circuit 2 calculates the constant value β from the fluctuation value σ.
A value (α (σ−β)) obtained by multiplying the value obtained by subtracting by a positive real number α is subtracted from the representative value y. A corrected representative value z = y−α (σ−β) is obtained by this, and this value z is encoded by the encoder 210 and then used as control information indicating the received electric field strength detected by the mobile device 200. , Transmitter 21
2. Transmitted to the base station 100 via the transmission / reception demultiplexer 204 and the antenna 202.
【００２７】基地局１００側では、空中線１０２で受信
した移動機からの送信電波が、送受信分波器１０４を介
して受信機１０６に入力される。受信機１０６で復調さ
れた受信信号のうち、移動機の受信電界強度ｚを示す制
御情報は、復号器１０８で復号され、送信電力決定回路
１１０に与えられる。送信電力決定回路１１０では、復
号器１０８から入力された電界強度制御情報に応じて、
各移動機と通信するための送信電力を決定し、電力制御
回路１１４に制御信号を与えて基地局側の送信電力を制
御すると共に、符号器１１２に移動機送信電力制御デー
タを出力する。上記送信電力制御データは、符号器１１
２によって符号化された後、送信機１１６、送受信分波
器１０４、空中線１０２を介して移動機に送信される。On the side of the base station 100, the radio wave transmitted from the mobile station received by the antenna 102 is input to the receiver 106 via the transmission / reception duplexer 104. Of the received signal demodulated by the receiver 106, the control information indicating the received electric field strength z of the mobile device is decoded by the decoder 108 and given to the transmission power determination circuit 110. In the transmission power determination circuit 110, according to the electric field strength control information input from the decoder 108,
The transmission power for communicating with each mobile device is determined, a control signal is given to the power control circuit 114 to control the transmission power on the base station side, and the mobile device transmission power control data is output to the encoder 112. The transmission power control data is the encoder 11
After being encoded by 2, the signal is transmitted to the mobile device via the transmitter 116, the transmission / reception demultiplexer 104, and the antenna 102.
【００２８】移動機２００の受信機２０６は、上記送信
電力制御データを受信すると、これを復号器２１４に出
力する。復号器２１４で復号された送信電力制御データ
は、電力制御回路２１６に与えられ、これによって送信
機２１２の出力電力が制御される。上述したように、移
動機からの受信電力の代表値（平均値）と変動値とに基
づいて送信電力制御データを生成することによって、移
動機が移動しているとき（フェージングが大きいとき）
には、許容電界強度に関して移動機と基地局の送信出力
に比較的大きなマージンを与え、移動機が静止している
とき（フェージングが小さいとき）には、マージンを下
げて必要最小限の送信出力となるように電力制御が行わ
れる。When the receiver 206 of the mobile device 200 receives the transmission power control data, it outputs it to the decoder 214. The transmission power control data decoded by the decoder 214 is given to the power control circuit 216, which controls the output power of the transmitter 212. As described above, when the mobile device is moving (when fading is large) by generating the transmission power control data based on the representative value (average value) of the received power from the mobile device and the fluctuation value.
Gives a relatively large margin to the transmission output of the mobile station and the base station regarding the allowable electric field strength, and lowers the margin when the mobile station is stationary (fading is small) to the minimum required transmission output. The power control is performed so that
【００２９】図５は、図１に示した無線通信システムの
変形例として、電界強度補正回路２を基地局１００側に
設けた構成を示す。移動機２００では、図１と同様に、
基地局からの受信電波の電界強度（ｘ）を電界強度検出
回路２０８によって検出し、代表値／変動値計算回路１
によって、受信電界強度の代表値ｙと変動値σを求め
る。本実施例では、これらの代表値ｙと変動値σを含む
制御情報が、符号器２２０により符号化され、送信機２
１２、送受信分波器２０４、空中線２０２を介して、基
地局に送信される。基地局１００では、移動動機から送
信された上記受信電界強度代表値ｙと変動値σとを含む
制御情報を受信機１０６で復調し、復号器１１８で復号
した後、電界強度補正回路２によって、図１で説明した
補正回路２の場合と同様に、補正された代表値ｚ＝ｙ−
α（σ−β）を算出する。上記代表値は送信電力決定回
路１１０に入力され、電力制御回路１１４に与えるべき
制御信号と、符号器１１２に与えるべき移動機電力制御
データとが生成される。FIG. 5 shows, as a modification of the wireless communication system shown in FIG. 1, a configuration in which the electric field strength correction circuit 2 is provided on the base station 100 side. In the mobile device 200, as in FIG.
The electric field strength (x) of the radio wave received from the base station is detected by the electric field strength detection circuit 208, and the representative value / variation value calculation circuit 1
Then, the representative value y of the received electric field strength and the fluctuation value σ are obtained. In the present embodiment, the control information including the representative value y and the variation value σ is encoded by the encoder 220, and the transmitter 2
The signal is transmitted to the base station via 12, the transmission / reception demultiplexer 204, and the antenna 202. In the base station 100, the control information including the reception electric field strength representative value y and the fluctuation value σ transmitted from the mobile station is demodulated by the receiver 106, decoded by the decoder 118, and then by the electric field strength correction circuit 2. As in the case of the correction circuit 2 described in FIG. 1, the corrected representative value z = y−
Calculate α (σ−β). The representative value is input to the transmission power determination circuit 110, and a control signal to be given to the power control circuit 114 and mobile station power control data to be given to the encoder 112 are generated.
【００３０】図６は、基地局１００で各移動機２００の
受信電界強度を検出し、移動機の送信出力制御量を決定
するようにした本発明の他の実施例を示す。基地局１０
０において、空中線１０２で受信した移動機からの電波
は、送受信分波器１０４を介して受信機１０６に入力さ
れ、移動機２００から送信された電波の受信電界強度ｘ
が、電界強度検出回路１２０により検出される。代表値
／変動値計算回路１は、各移動機対応に、過去所定期間
内の受信電界強度を示す複数の標本値ｘから代表値ｙと
変動値σを求め、これらの値を電界強度補正回路２に与
える。電界強度補正回路２は、これらの代表値と変動値
とを用いて第１実施例と同様の補正された代表値ｚを算
出し、その値を受信電界強度として出力する。FIG. 6 shows another embodiment of the present invention in which the base station 100 detects the received electric field strength of each mobile unit 200 and determines the transmission output control amount of each mobile unit. Base station 10
At 0, the radio wave from the mobile device received by the antenna 102 is input to the receiver 106 via the transmission / reception demultiplexer 104, and the received electric field strength x of the radio wave transmitted from the mobile device 200.
Is detected by the electric field strength detection circuit 120. The representative value / variation value calculation circuit 1 obtains a representative value y and a variation value σ from a plurality of sample values x indicating the received electric field intensity within a predetermined past period for each mobile device, and calculates these values in the electric field intensity correction circuit. Give to 2. The electric field intensity correction circuit 2 calculates a corrected representative value z similar to that of the first embodiment using these representative value and the variation value, and outputs that value as the received electric field intensity.
【００３１】送信電力決定回路１１０は、上記受信電界
強度ｚに応じて、通信に必要な最小限の送信電力を決定
し、電力制御回路１１４によって基地局１００の送信電
力を制御しりと共に、移動機の送信電力制御データを符
号器１１２に与える。上記送信電力制御データは、符号
器１１２で符号化され、送信機１１６、送受信分波器１
０４、空中線１０２を介して移動機に送出される。The transmission power determination circuit 110 determines the minimum transmission power required for communication according to the received electric field strength z, and controls the transmission power of the base station 100 by the power control circuit 114, and at the same time, the mobile station. To the encoder 112. The transmission power control data is encoded by the encoder 112, and the transmitter 116 and the transmission / reception duplexer 1 are encoded.
04, sent to the mobile unit via the antenna 102.
【００３２】移動機２００側では、空中線２０２から入
力された上記電力制御データを送受信分波器２０４介し
て受信機２０６で受信し、復号器２１４で復号する。電
力制御回路２１６は、復号器２１４から出力された電力
制御信号に応じて、基地局が指定した送信電力となるよ
うに送信機２１２の送信出力を制御する。On the mobile unit 200 side, the power control data input from the antenna 202 is received by the receiver 206 via the transmission / reception duplexer 204 and decoded by the decoder 214. The power control circuit 216 controls the transmission output of the transmitter 212 according to the power control signal output from the decoder 214 so that the transmission power becomes the transmission power designated by the base station.
【００３３】図７は、変動情報として平均値と標準偏差
を用いる代表値／変動値計算回路１の１実施例を示す。
代表値／変動値計算回路１は、入力された受信電界強度
ｘを移動機対応のシフトレジスタ回路４００に順次に書
き込み、過去複数スロット分の受信電界強度ｘ（ｔ）
（ｔ＝１、２、…、ｎ）を保持する。４０２は、これら
の受信電界強度の値から、平均値（ｙ＝Σｘ（ｔ）／
ｎ：ｔ＝１，２，…，ｎ）を計算する平均値計算回路で
あり、４０４は、平均値計算回路４０２の演算結果と、
上記シフトレジスタに蓄積された受信電界強度とから、
標準偏差（σ＝√（（ｘ（１）−ｙ）2＋（ｘ（２）−
ｙ）2＋…＋（ｘ（ｎ）−ｙ）2）／ｎ）を求めるための
標準偏差計算回路である。電界強度補正回路２は、代表
値／平均値計算回路１から出力される標準偏差σと平均
値ｙを用い、標準偏差σの値から所定値βを減じ、これ
に正の実数αを掛けた値（α（σ−β））を上記平均値
ｙから減算することによって、補正された受信電界強度
の値ｚを求める。FIG. 7 shows an embodiment of the representative value / variation value calculation circuit 1 which uses the average value and the standard deviation as the variation information.
The representative value / variation value calculation circuit 1 sequentially writes the input received electric field strength x into the shift register circuit 400 corresponding to the mobile device, and receives the received electric field strength x (t) for a plurality of past slots.
Holds (t = 1, 2, ..., N). 402 represents the average value (y = Σx (t) /
n: t = 1, 2, ..., N) is an average value calculation circuit, and 404 is a calculation result of the average value calculation circuit 402,
From the received electric field strength accumulated in the shift register,
Standard deviation (σ = √ ((x (1) −y) 2 + (x (2) −
y) 2 + ... + (x (n) -y) 2 ) / n) is a standard deviation calculation circuit. The electric field strength correction circuit 2 uses the standard deviation σ and the average value y output from the representative value / average value calculation circuit 1, subtracts a predetermined value β from the value of the standard deviation σ, and multiplies this by a positive real number α. By subtracting the value (α (σ−β)) from the average value y, the corrected received electric field strength value z is obtained.
【００３４】上記実施例では、電界強度の変動（フェー
ジング）を検出するために、平均値と標準偏差を求めた
が、電界強度変動情報として、中央値や分散など、他の
尺度を用いてもよい。例えば、代表値／変動値計算回路
１が、シフトレジスタに記憶しておいた受信電界強度の
過去の複数の標本値の中から最大値と最小値を選択し、
これらの値を用いて代表値ｙと変動値σを演算するよう
にしてもよい。In the above embodiment, the average value and the standard deviation were obtained in order to detect the fluctuation (fading) of the electric field strength. However, as the electric field strength fluctuation information, other scales such as the median value and variance may be used. Good. For example, the representative value / variation value calculation circuit 1 selects the maximum value and the minimum value from a plurality of past sample values of the received electric field strength stored in the shift register,
The representative value y and the variation value σ may be calculated using these values.
【００３５】図９は、上述した最大値と最小値を用いて
受信電界強度ｚを求める回路構成の１例を示す。４０６
は、所定期間内に得られた受信電界強度の標本値の中か
ら最大値（ｍａｘ）と最小値（ｍｉｎ）を選択し、これ
らの値を保持する最大／最小値保持回路、４０８は、最
大値と最小値の和の半分（（ｍａｘ＋ｍｉｎ）／２）を
代表値ｙとし、最大値と最小値の差に正の実数（γ）を
掛けたもの（γ（ｍａｘ−ｍｉｎ））を変動値σとして
出力する中央値／変位計算回路である。電界強度補正回
路２が、変動値σから所定値βを減じたものに正の実数
を掛けた値を代表値ｙから減算し、この値を受信電界強
度の値ｚとして出力するようにしてもよい。FIG. 9 shows an example of a circuit configuration for obtaining the received electric field strength z by using the above-mentioned maximum value and minimum value. 406
Is a maximum / minimum value holding circuit for selecting the maximum value (max) and the minimum value (min) from the sampled values of the received electric field strength obtained within a predetermined period, and 408 is the maximum value Half of the sum of the value and the minimum value ((max + min) / 2) is set as the representative value y, and the difference between the maximum value and the minimum value is multiplied by a positive real number (γ) (γ (max-min)), which is the variation value. It is a median / displacement calculation circuit that outputs as σ. Even if the electric field strength correction circuit 2 subtracts a value obtained by multiplying the fluctuation value σ by the predetermined value β by a positive real number from the representative value y, and outputs this value as the received electric field strength value z. Good.
【００３６】こうして求めた代表値と変動値を用いて、
先に示した電界強度補正回路２により変動を考慮した受
信電界強度を得る。このようにすることにより、平均や
標準偏差を求める手法に比べて計算量を大幅に削減する
ことができる。Using the representative value and the fluctuation value thus obtained,
The electric field strength correction circuit 2 described above obtains the received electric field strength in consideration of fluctuations. By doing so, the amount of calculation can be significantly reduced as compared with the method of obtaining the average or standard deviation.
【００３７】[0037]
【発明の効果】以上の説明から明らかなように、本発明
によれば、基地局と移動機との間の無線区間における平
均的な回線利得の状態およびフェージングの状態に応じ
て移動機の送信電力を制御するようになっているため、
移動機における消費電力を低減できる。従って、電池を
電源とする携帯用無線機においては、電池寿命が延び、
一回の充電で可能な機器の使用時間を延長できる。ま
た、同一周波数を複数の移動機で共用する形式の移動無
線システムに本発明を適用した場合、各移動機の送信電
力が低減されたことによって、他局への影響が少なくな
り、システム全体としての周波数利用効率が向上すると
いう効果がある。As is apparent from the above description, according to the present invention, the transmission of the mobile device according to the state of the average line gain and the state of fading in the wireless section between the base station and the mobile device. Because it is designed to control power,
The power consumption of the mobile device can be reduced. Therefore, in a portable wireless device that uses a battery as a power source, the battery life is extended,
The usage time of the device that can be charged once can be extended. Further, when the present invention is applied to a mobile radio system of a type in which the same frequency is shared by a plurality of mobile devices, the transmission power of each mobile device is reduced, so that the influence on other stations is reduced and the entire system is reduced. There is an effect that the frequency utilization efficiency of is improved.
【図１】本発明による無線通信システムの１実施例を示
すブロック図。FIG. 1 is a block diagram showing an embodiment of a wireless communication system according to the present invention.
【図２】従来の電力制御方式における受信電界強度と許
容電界強度との関係を説明するための図。FIG. 2 is a diagram for explaining a relationship between a received electric field strength and an allowable electric field strength in a conventional power control method.
【図３】本発明の電力制御方式における受信電界強度と
許容電界強度との関係を説明するための図。FIG. 3 is a diagram for explaining the relationship between the received electric field strength and the allowable electric field strength in the power control system of the present invention.
【図４】基地局と移動機の間の回線利得が（Ａ）のよう
に変化した場合に、本発明（太線）と従来（細線）の電
力制御方式による移動機送信電力の変化（Ｂ）と、基地
局受信電界強度の変化（Ｃ）の関係を説明するための
図。FIG. 4 is a diagram showing a change in transmission power of a mobile device by a power control method of the present invention (thick line) and a conventional (thin line) when the line gain between the base station and the mobile device changes as shown in (A) (B). And FIG. 6 is a diagram for explaining the relationship between a change (C) in the received electric field strength of the base station.
【図５】本発明による無線通信システムの第２の実施例
を示すブロック図。FIG. 5 is a block diagram showing a second embodiment of the wireless communication system according to the present invention.
【図６】本発明による無線通信システムの第３の実施例
を示すブロック図。FIG. 6 is a block diagram showing a third embodiment of the wireless communication system according to the present invention.
【図７】代表値／平均値計算回路１の１実施例を示すブ
ロック図。FIG. 7 is a block diagram showing an embodiment of a representative value / average value calculation circuit 1.
【図８】代表値／平均値計算回路１の他の実施例を示す
ブロック図。FIG. 8 is a block diagram showing another embodiment of the representative value / average value calculation circuit 1.
【図９】従来の電力制御方式を適用した無線通信システ
ムの１例を示すブロック図。FIG. 9 is a block diagram showing an example of a wireless communication system to which a conventional power control method is applied.
１…平均値／変動値計算回路、２…電界強度補正回路、
１００…基地局、１０２…空中線、１０４…送受信分波
器、１０６…受信機、１０８…復号器、１１０…送信電
力決定回路、１１２…符号器、１１４…電力制御回路、
１１６…送信機、１１８…復号器、２００…移動機、２
０２…空中線、２０４…送受信分波器、２０６…受信
機、２０８…電界強度検出回路、２１０…符号器、２１
２…送信機、２１４…復号器、２１６…電力制御回路、
２１８…平均値計算回路、２２０…符号器、３００…深
いフェージング発生時の受信電界強度、３０２…浅いフ
ェージング発生時の受信電界強度、３０４…最低受信可
能電界強度、３０６…回線利得、３０８…回線利得が高
く安定している区間、３１０…回線利得が高く深いフェ
ージングが発生している区間、３１２…回線利得が低く
安定している区間、３１６…従来法による移動機送信電
力、３１８…本発明による移動機送信電力、３２２…従
来法による基地局受信電界強度、３２４…本発明による
基地局受信電界強度、３２６…最低受信可能電界強度。1 ... Average value / variation value calculation circuit, 2 ... Electric field strength correction circuit,
100 ... Base station, 102 ... Antenna, 104 ... Transmission / reception demultiplexer, 106 ... Receiver, 108 ... Decoder, 110 ... Transmission power determination circuit, 112 ... Encoder, 114 ... Power control circuit,
116 ... Transmitter, 118 ... Decoder, 200 ... Mobile device, 2
02 ... Antenna, 204 ... Transmission / reception duplexer, 206 ... Receiver, 208 ... Electric field intensity detection circuit, 210 ... Encoder, 21
2 ... Transmitter, 214 ... Decoder, 216 ... Power control circuit,
218 ... Average value calculation circuit, 220 ... Encoder, 300 ... Received field strength when deep fading occurs, 302 ... Received field strength when shallow fading occurs, 304 ... Minimum receivable field strength, 306 ... Line gain, 308 ... Line A section where the gain is high and stable, 310 ... A section where the line gain is high and deep fading occurs, 312 ... A section where the line gain is low and stable, 316 ... Mobile transmission power by conventional method, 318 ... The present invention Mobile station transmission power, 322 ... Base station reception electric field strength according to conventional method, 324 ... Base station reception electric field strength according to the present invention, 326 ... Minimum receivable electric field strength.
Claims (31)
移動無線通信システムにおける移動機の電力制御方法で
あって、 移動機毎の受信電波の電界強度とフェージング量とに応
じて各移動機の送信電力を制御するようにしたことを特
徴とする電力制御方法。1. A power control method for a mobile unit in a mobile radio communication system comprising a base station and at least one mobile unit, each mobile unit according to the electric field strength of received radio waves and the fading amount for each mobile unit. A power control method characterized in that the transmission power of a machine is controlled.
移動無線通信システムにおける移動機の電力制御方法で
あって、 移動機毎の受信電波の電界強度とフェージング量とを測
定し、該測定値に応じて各移動機の送信電力および基地
局における各移動機対応の送信電力を制御するようにし
たことを特徴とする電力制御方法。2. A power control method for a mobile unit in a mobile radio communication system comprising a base station and at least one mobile unit, the electric field strength of received radio waves and fading amount of each mobile unit are measured, A power control method characterized in that the transmission power of each mobile device and the transmission power corresponding to each mobile device in a base station are controlled according to a measured value.
移動無線通信システムにおける移動機の電力制御方法で
あって、 移動機における受信電波の電界強度と変動量とを測定
し、上記変動量に応じて補正した電界強度の値に基づい
て、移動機の送信電力を制御するようにしたことを特徴
とする電力制御方法。3. A power control method for a mobile device in a mobile radio communication system comprising a base station and at least one mobile device, the electric field strength and fluctuation amount of a received radio wave in the mobile device being measured, and the fluctuation is measured. A power control method characterized in that the transmission power of the mobile device is controlled based on the value of the electric field strength corrected according to the amount.
と、前記電界強度値の補正とを移動機側で行い、該補正
された電界強度値を移動機から基地局に通知し、基地局
が、上記補正された電界強度値に応じて、上記移動機と
通信するための送信電力制御および上記移動機に対する
電力制御信号の送信動作を行い、移動機が上記基地局か
ら受信した電力制御信号に従って送信電力を制御するこ
とを特徴とする請求項３に記載の電力制御方法。4. The mobile unit measures the electric field strength and variation of the received radio wave and corrects the electric field strength value, and notifies the corrected electric field strength value from the mobile unit to a base station. The station controls the transmission power for communicating with the mobile station and the operation of transmitting a power control signal to the mobile station according to the corrected electric field strength value, and the power control received by the mobile station from the base station. The power control method according to claim 3, wherein the transmission power is controlled according to the signal.
移動機側で行い、これらの値を移動機から基地局に通知
し、基地局が、移動機から受信した上記電界強度と変動
量の値に基づいて電界強度値の補正を行い、該補正され
た電界強度値に応じて、上記移動機と通信するための送
信電力制御および上記移動機に対する電力制御信号の送
信動作を行い、移動機が上記基地局から受信した電力制
御信号に従って送信電力を制御することを特徴とする請
求項３に記載の電力制御方法。5. The electric field strength and fluctuation amount of the received radio waves are measured on the mobile unit side, and the mobile unit notifies the base station of these values, and the base station receives the electric field strength and fluctuations from the mobile unit. Correcting the electric field strength value based on the value of the amount, according to the corrected electric field strength value, performs transmission power control for communicating with the mobile device and a transmission operation of a power control signal to the mobile device, The power control method according to claim 3, wherein the mobile device controls transmission power according to a power control signal received from the base station.
界強度が同じ場合、その変動量が小さくなるに従って送
信電力が低下するように行われることを特徴とする請求
項３〜請求項５の何れかに記載の電力制御方法。6. The correction of the electric field strength is performed so that, when the electric field strengths of the received radio waves are the same, the transmission power decreases as the fluctuation amount decreases. The power control method according to any one of 1.
界強度の平均値を示し、前記変動量が上記期間内におけ
る電界強度の標準偏差を示すことを特徴とする請求項３
〜請求項５の何れかに記載の電力制御方法。7. The electric field strength of the received radio wave indicates an average value of the electric field strength within a predetermined period, and the variation indicates the standard deviation of the electric field strength within the period.
~ The power control method according to claim 5.
測定された電界強度の最大値と最小値とから求まる平均
値であり、前記変動量が上記最大値と最小値との差であ
ることを特徴とする請求項３〜請求項５の何れかに記載
の電力制御方法。8. The electric field strength of the received radio wave is an average value obtained from the maximum value and the minimum value of the electric field strength measured within a predetermined period, and the fluctuation amount is a difference between the maximum value and the minimum value. It exists, The electric power control method in any one of Claims 3-5.
移動無線通信システムにおける移動機の電力制御方法で
あって、 基地局が、移動機対応に受信電波の電界強度と変動量と
を測定し、上記変動量に応じて補正した電界強度の値に
基づいて各移動機に送信電力制御指令を与えることを特
徴とする電力制御方法。9. A power control method for a mobile device in a mobile radio communication system comprising a base station and at least one mobile device, wherein the base station controls the electric field strength and fluctuation amount of a received radio wave for the mobile device. A power control method, characterized in that a transmission power control command is given to each mobile device based on a value of an electric field strength measured and corrected according to the variation amount.
数の電界強度測定値から電界強度の代表値を求め、該代
表値を上記期間内における電界強度変動量に応じて補正
し、該補正された電界強度の代表値に基づいて、前記移
動機に与えるべき送信電力制御指令を決定することを特
徴とする請求項９に記載の電力制御方法。10. The base station obtains a representative value of electric field strength from a plurality of electric field strength measurement values obtained within a predetermined period, corrects the representative value according to the amount of electric field strength variation within the period, and The power control method according to claim 9, wherein the transmission power control command to be given to the mobile device is determined based on the corrected representative value of the electric field strength.
数の電界強度測定値の平均値を電界強度代表値とし、該
代表値を上記期間内における電界強度の変動量に応じて
補正し、該補正された電界強度の代表値に基づいて、前
記移動機に与えるべき送信電力制御指令を決定すること
を特徴とする請求項１０に記載の電力制御方法。11. The electric field strength representative value is an average value of a plurality of electric field strength measurement values obtained within a predetermined period, and the base station corrects the representative value according to a variation amount of the electric field strength within the period. 11. The power control method according to claim 10, wherein a transmission power control command to be given to the mobile device is determined based on the corrected representative value of the electric field strength.
る複数の電界強度測定値の標準偏差を前記電界強度の変
動量として、前記補正された電界強度の代表値を求める
ことを特徴とする請求項１１に記載の電力制御方法。12. The base station obtains the corrected representative value of the electric field strength by using a standard deviation of a plurality of electric field strength measurement values obtained within the predetermined period as a variation amount of the electric field strength. The power control method according to claim 11.
数の電界強度測定値のうちの最大値と最小値から求めた
平均値を前記電界強度の代表値とし、該代表値を上記最
大値と最小値の差に応じて補正し、該補正された電界強
度の代表値に基づいて、前記移動機に与えるべき送信電
力制御指令を決定することを特徴とする請求項１０に記
載の電力制御方法。13. The base station sets an average value obtained from a maximum value and a minimum value of a plurality of electric field strength measurement values obtained within a predetermined period as a representative value of the electric field strength, and the representative value is the maximum value. 11. The power according to claim 10, wherein the power is corrected according to a difference between the value and the minimum value, and the transmission power control command to be given to the mobile device is determined based on the corrected representative value of the electric field strength. Control method.
通信システムの移動機であって、 基地局からの受信電波の電界強度を測定し、電界強度の
代表値と変動量を求めるための第１手段と、 上記電界強度の代表値を上記変動量に応じて補正し、補
正された電界強度の値を基地局に送信するための第２手
段と、 基地局から受信した電力制御信号に応じて送信電力を制
御するための第３手段とを備えたことを特徴とする移動
機。14. A mobile device of a wireless communication system, which communicates with a base station via a wireless line, for measuring the electric field strength of a radio wave received from the base station to obtain a representative value and fluctuation amount of the electric field strength. A first means, a second means for correcting the representative value of the electric field strength according to the variation amount, and transmitting the corrected value of the electric field strength to the base station, and a power control signal received from the base station. And a third means for controlling the transmission power accordingly.
た複数の電界強度測定値の平均値および該期間内におけ
る電界強度の変動量を前記電界強度の代表値および変動
量とすることを特徴とする請求項１４に記載の移動機。15. The first means sets an average value of a plurality of electric field strength measurement values measured within a predetermined period and a variation amount of the electric field intensity within the period as a representative value and a variation amount of the electric field intensity. The mobile device according to claim 14, wherein:
れる電界強度測定値の標準偏差を前記電界強度の変動量
とすることを特徴とする請求項１５に記載の移動機。16. The mobile device according to claim 15, wherein the first means sets a standard deviation of electric field strength measurement values obtained within the predetermined period as a variation amount of the electric field strength.
た複数の電界強度測定値のうちの最大値と最小値から求
めた平均値を前記電界強度の代表値とし、上記最大値と
最小値の差を前記変動量とすることを特徴とする請求項
１４に記載の移動機。17. The average value obtained from a maximum value and a minimum value of a plurality of electric field strength measurement values measured within a predetermined period is used as a representative value of the electric field strength by the first means, and the maximum value is obtained. The mobile device according to claim 14, wherein the difference between the minimum values is used as the variation amount.
通信システムの移動機であって、 基地局からの受信電波の電界強度を測定し、電界強度の
代表値と変動量を求めるための第１手段と、 上記第１手段で求めた電界強度の代表値と変動量を基地
局に送信するための第２手段と、 基地局から受信した電力制御信号に応じて送信電力を制
御するための第３手段とを備えたことを特徴とする移動
機。18. A mobile device of a wireless communication system, which communicates with a base station via a wireless line, for measuring the electric field strength of a radio wave received from the base station to obtain a representative value and fluctuation amount of the electric field strength. A first means, a second means for transmitting the representative value of the electric field strength and the fluctuation amount obtained by the first means to the base station; and controlling the transmission power according to the power control signal received from the base station. And a third means of the mobile device.
た複数の電界強度測定値の平均値および該期間内におけ
る電界強度の変動量を前記電界強度の代表値および変動
量とすることを特徴とする請求項１８に記載の移動機。19. The average value of a plurality of electric field strength measurement values measured within a predetermined period and the variation amount of the electric field intensity within the period are set as the representative value and the variation amount of the electric field intensity by the first means. The mobile device according to claim 18, wherein:
れる電界強度測定値の標準偏差を前記電界強度の変動量
とすることを特徴とする請求項１８に記載の移動機。20. The mobile device according to claim 18, wherein the first means sets a standard deviation of electric field strength measurement values obtained within the predetermined period as a variation amount of the electric field strength.
た複数の電界強度測定値のうちの最大値と最小値から求
めた平均値を前記電界強度の代表値とし、上記最大値と
最小値の差を前記変動量とすることを特徴とする請求項
１８に記載の移動機。21. The first means sets an average value obtained from a maximum value and a minimum value of a plurality of electric field strength measurement values measured within a predetermined period as a representative value of the electric field strength, and the maximum value The mobile device according to claim 18, wherein the difference between the minimum values is used as the variation amount.
通信システムの基地局であって、 移動機から通知された該移動機における受信電波の電界
強度の代表値と変動量に基づいて、該移動機に送出すべ
き送信電力制御信号を生成するための第１手段と、 上記送信電力制御信号を移動機宛に送信するための第２
手段とを備えたことを特徴とする基地局。22. A base station of a wireless communication system, which communicates with a mobile device via a wireless line, based on a representative value and a variation amount of electric field strength of a received radio wave in the mobile device, which is notified from the mobile device, First means for generating a transmission power control signal to be sent to the mobile device, and second means for transmitting the transmission power control signal to the mobile device
And a base station.
前記電界強度の代表値を前記変動量に応じて補正し、該
補正値と予め定められた許容受信レベルとの関係に応じ
て、前記移動機に送出すべき送信電力制御信号を生成す
ることを特徴とする請求項２２に記載の基地局。23. The first means corrects a representative value of the electric field strength notified from a mobile device according to the variation amount, and according to a relationship between the correction value and a predetermined allowable reception level. 23. The base station according to claim 22, wherein the base station generates a transmission power control signal to be transmitted to the mobile device.
通信システムの基地局であって、 移動機対応に、所定期間内での移動機からの受信電波の
電界強度を測定し、電界強度の代表値と変動量を求める
ための第１手段と、 上記電界強度の代表値を上記変動量に応じて補正し、補
正された電界強度の値に応じて、各移動機毎の送信電力
制御信号を生成するための第２手段と、 上記送信電力制御信号を移動機宛に送信するための第３
手段とを備えたことを特徴とする基地局。24. A base station of a wireless communication system, which communicates with a mobile device via a wireless line, for measuring the electric field strength of a radio wave received from the mobile device within a predetermined period for the mobile device. Means for obtaining the representative value and the amount of fluctuation of the electric field strength, and the representative value of the electric field strength is corrected according to the amount of fluctuation, and the transmission power control for each mobile device is performed according to the corrected value of the electric field strength. Second means for generating a signal, and third means for transmitting the transmission power control signal to the mobile device
And a base station.
た複数の電界強度測定値の平均値および該期間内におけ
る電界強度の変動量を前記電界強度の代表値および変動
量とすることを特徴とする請求項２４に記載の移動機。25. The first means sets an average value of a plurality of electric field strength measurement values measured within a predetermined period and a variation amount of the electric field intensity within the period as a representative value and a variation amount of the electric field intensity. The mobile device according to claim 24, wherein:
れる電界強度測定値の標準偏差を前記電界強度の変動量
とすることを特徴とする請求項２５に記載の移動機。26. The mobile device according to claim 25, wherein the first means sets a standard deviation of electric field strength measurement values obtained within the predetermined period as a variation amount of the electric field strength.
た複数の電界強度測定値のうちの最大値と最小値から求
めた平均値を前記電界強度の代表値とし、上記最大値と
最小値の差を前記変動量とすることを特徴とする請求項
２４に記載の移動機。27. The first means sets an average value obtained from the maximum value and the minimum value of a plurality of electric field strength measurement values measured within a predetermined period as a representative value of the electric field strength, and the maximum value The mobile device according to claim 24, wherein the difference between the minimum values is used as the variation amount.
通信システムの基地局であって、 移動機対応に、移動機からの受信電波の電界強度を示す
電界強度代表値とフェージングの量を求めるための手段
と、 上記電界強度の代表値と上記フェージング量に応じて、
各移動機毎の送信電力制御信号を生成するための手段
と、 上記送信電力制御信号を移動機宛に送信するための手段
とを備えたことを特徴とする基地局。28. A base station of a wireless communication system which communicates with a mobile device via a wireless line, wherein a field strength representative value indicating a field strength of a radio wave received from the mobile device and an amount of fading are provided for the mobile device. According to the means for obtaining, the representative value of the electric field strength and the fading amount,
A base station comprising: means for generating a transmission power control signal for each mobile device; and means for transmitting the transmission power control signal to the mobile device.
る移動無線通信システムにおいて、 移動機または基地局の何れかに、移動機の移動の伴って
変化する受信電波の電界強度とフェージング量とを求め
るための手段を有し、 基地局が、移動機対応の受信電波の電界強度と上記フェ
ージング量に応じて、各移動機毎の送信電力制御信号を
生成するための手段を有し、 移動機が、基地局から受信した上記送信電力制御信号に
基づいて送信電力を制御するようにしたことを特徴とす
る移動無線通信システム。29. In a mobile radio communication system comprising a base station and at least one mobile unit, the electric field strength and fading amount of a received radio wave which changes with the movement of the mobile unit are provided to either the mobile unit or the base station. The base station has means for generating a transmission power control signal for each mobile unit according to the electric field strength of the received radio wave corresponding to the mobile unit and the fading amount. The mobile radio communication system is characterized in that the transmission power is controlled based on the transmission power control signal received from the base station.
る移動無線通信システムにおいて、 移動機が、受信電波の電界強度の値をフェージング量に
応じて補正した形で基地局に通知するための手段を有
し、 基地局が、移動機から通知された上記補正された電界強
度の値に応じて、各移動機毎の送信電力制御信号を生成
するための手段を有し、 移動機が、基地局から受信した上記送信電力制御信号に
基づいて送信電力を制御するようにしたことを特徴とす
る移動無線通信システム。30. A mobile radio communication system comprising a base station and at least one mobile device, wherein the mobile device notifies the base station of a value of electric field strength of a received radio wave in a form corrected in accordance with a fading amount. The base station has means for generating a transmission power control signal for each mobile device according to the value of the corrected electric field strength notified from the mobile device, and the mobile device is A mobile radio communication system characterized in that transmission power is controlled based on the transmission power control signal received from a station.
移動機とからなる移動無線通信システムにおいて、 移動機対応に無線チャネルの回線利得の状態とフェージ
ングの程度を検出するための手段と、 上記回線利得の状態とフェージングの程度に応じて許容
受信レベルに対するマージンの値を変えて、各移動機毎
の送信電力を制御するための手段とを有することを特徴
とする移動無線通信システム。31. In a mobile radio communication system comprising a base station and a mobile device that communicate via a radio channel, means for detecting the state of line gain and fading degree of the radio channel corresponding to the mobile device, A mobile radio communication system comprising: means for controlling a transmission power of each mobile device by changing a margin value with respect to an allowable reception level according to a state of line gain and a degree of fading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6310191A JPH08167872A (en) | 1994-12-14 | 1994-12-14 | Mobile radio communication system and power controlling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6310191A JPH08167872A (en) | 1994-12-14 | 1994-12-14 | Mobile radio communication system and power controlling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08167872A true JPH08167872A (en) | 1996-06-25 |
Family
ID=18002274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6310191A Pending JPH08167872A (en) | 1994-12-14 | 1994-12-14 | Mobile radio communication system and power controlling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08167872A (en) |
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