JP2993561B2 - Transmission power control method in mobile communication system - Google Patents
Transmission power control method in mobile communication systemInfo
- Publication number
- JP2993561B2 JP2993561B2 JP10029934A JP2993498A JP2993561B2 JP 2993561 B2 JP2993561 B2 JP 2993561B2 JP 10029934 A JP10029934 A JP 10029934A JP 2993498 A JP2993498 A JP 2993498A JP 2993561 B2 JP2993561 B2 JP 2993561B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission power
- error rate
- bit error
- control channel
- field strength
- 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.)
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- Transmitters (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、基地局と移動機と
の間で無線通信を行う移動通信システムにおいて、送信
時の電力を制御する送信電力制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control method for controlling transmission power in a mobile communication system for performing wireless communication between a base station and a mobile station.
【０００２】[0002]
【従来の技術】従来、例えば次の公報に記載のような送
信電力制御方法が知られている。 特開平５−２４４０５６号公報 送信局の送信機から送信された信号のビット誤り率を検
出し、このビット誤り率が、第一の閾値以下の場合には
送信機の送信電力を予め定めた量だけ減少させ、第一の
閾値より大きい第二の閾値以上の場合には送信電力を予
め定めた量だけ増加させる。 特開平３−２３１５２３号公報 複数の発信制御チャネル毎に移動局がアクセスする送信
電力の最大値及び最小値を予め移動局に報知しておき、
移動局は発信時に最小の送信電力で発信制御チャネルに
よりアクセスを行い、無線基地と制御信号の交信が不成
功であった場合、移動局は送信電力の最大値まで順次段
階的に送信電力を上げてアクセスを行う。 特開昭５８−１７８６３７号公報 無線基地局が移動体に対し送信電力を制御するのに合わ
せて、無線基地局の送信電力も同時に制御する。2. Description of the Related Art Conventionally, a transmission power control method as described in, for example, the following publication is known. SUMMARY OF THE INVENTION A bit error rate of a signal transmitted from a transmitter of a transmitting station is detected, and when the bit error rate is equal to or less than a first threshold, the transmission power of the transmitter is set to a predetermined amount. And if it is greater than or equal to a second threshold greater than the first threshold, the transmission power is increased by a predetermined amount. SUMMARY OF THE INVENTION The maximum value and the minimum value of the transmission power accessed by the mobile station for each of a plurality of transmission control channels are reported to the mobile station in advance,
The mobile station accesses the transmission control channel with the minimum transmission power at the time of transmission, and if the communication between the radio base station and the control signal is unsuccessful, the mobile station sequentially increases the transmission power up to the maximum transmission power. Access. As the radio base station controls the transmission power for the mobile unit, the transmission power of the radio base station is controlled at the same time.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の方法
は、上り及び下り通話チャネルの初期設定電力はある決
まった固定値となっており、通話チャネルに移行した
後、適切な送信電力に安定させるために電力制御を行っ
ているもので、その補正を繰り返し行う必要があった。However, in the conventional method, the initial setting power of the uplink and downlink traffic channels has a fixed fixed value, and after shifting to the traffic channel, the transmission power is stabilized at an appropriate level. Therefore, power control is performed, and it is necessary to repeat the correction.
【０００４】本発明の目的は、通話チャネルを設定する
前に、通話に適切な送信電力を決定して事後の送信電力
の補正を不要とし、基地局及び移動機の負荷を軽減する
とともに、必要以上の電力を送信することによるチャネ
ル間の干渉の発生も防止でき、且つ無線状態が不安定な
場所にいる移動機にも適切な初期送信電力を設定できる
送信電力制御方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to determine the appropriate transmission power for a call before setting a communication channel, to eliminate the need for subsequent correction of the transmission power, to reduce the load on the base station and the mobile station, and to reduce the load. It is an object of the present invention to provide a transmission power control method that can prevent the occurrence of interference between channels due to the transmission of the above power and that can set an appropriate initial transmission power even for a mobile station located in a place where the wireless state is unstable. .
【０００５】[0005]
【課題を解決するための手段】本発明の送信電力制御方
法は、上り通話チャネルの初期送信電力及び下り通話チ
ャネルの初期送信電力を次のようなステップで決定す
る。According to the transmission power control method of the present invention, the initial transmission power of the uplink traffic channel and the initial transmission power of the downlink traffic channel are determined in the following steps.
【０００６】移動機からの上り制御チャネルの電界強度
及びビット誤り率を基地局側で複数回測定する第１のス
テップ。基地局からの下り制御チャネルの電界強度及び
ビット誤り率を移動機側で複数回測定し、その測定結果
を前記上り制御チャネルにより基地局へ報告する第２の
ステップ。基地局において、上り制御チャネルの測定さ
れた複数回の電界強度及びビット誤り率の推移を見て電
界強度又はビット誤り率の一方のデータのみを採り、そ
の一方の平均値から上り初期送信電力を算出する第３の
ステップ。基地局において、報告された下り制御チャネ
ルの複数回の電界強度及びビット誤り率の推移を見て電
界強度又はビット誤り率の一方のデータのみを採り、そ
の一方の平均値から下り初期送信電力を算出する第４の
ステップ。算出された上り初期送信電力を前記下り制御
チャネルによって移動機へ報告する第５のステップ。移
動機において、報告された上り初期送信電力を、制御チ
ャネルから通話チャネルへの移行時に、上り通話チャネ
ルの初期送信電力として上り通話チャネルを設定する第
６のステップ。基地局において、算出された下り初期送
信電力を、制御チャネルから通話チャネルへの移行時
に、下り通話チャネルの初期送信電力として下り通話チ
ャネルを設定する第７のステップ。A first step in which the base station measures the electric field strength and the bit error rate of the uplink control channel from the mobile station a plurality of times. A second step of measuring the electric field strength and the bit error rate of the downlink control channel from the base station a plurality of times on the mobile device side, and reporting the measurement result to the base station via the uplink control channel. In the base station, by observing the transition of the measured field strength and bit error rate of the uplink control channel a plurality of times, only one data of the field strength or the bit error rate is taken, and the initial initial transmission power is calculated from the average value of one of them. Third step to calculate. In the base station, the transition of the electric field strength and the bit error rate of the reported downlink control channel a plurality of times is taken, and only one data of the electric field strength or the bit error rate is taken, and the downlink initial transmission power is calculated from the average value of one of them. Fourth step to calculate. A fifth step of reporting the calculated uplink initial transmission power to the mobile station via the downlink control channel. A sixth step of setting the reported uplink initial transmission power in the mobile station as the initial transmission power of the uplink traffic channel when the control channel shifts to the traffic channel; A seventh step in which the base station sets the downlink communication channel as the initial transmission power of the downlink communication channel using the calculated downlink initial transmission power when shifting from the control channel to the communication channel.
【０００７】上記第３のステップにおいて、ビット誤り
率が変化していないときは、電界強度の平均値のみから
上り初期送信電力を算出する。In the third step, when the bit error rate has not changed, the initial uplink transmission power is calculated only from the average value of the electric field strength.
【０００８】また、第４のステップにおいて、ビット誤
り率が変化していないときは、電界強度の平均値のみか
ら下り初期送信電力を算出する。In the fourth step, when the bit error rate has not changed, the downlink initial transmission power is calculated only from the average value of the electric field strength.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１に、本発明に係る送信電力制御方法を
適用する移動通信システムの概要を示す。基地局１と各
移動機２とは、従来と同様に移動機２から基地局１への
上り制御チャネル１０、基地局１から移動機２への下り
制御チャネル１１、移動機２から基地局１への上り通話
チャネル１２、基地局１から移動機２への下り通話チャ
ネル１４を設定して交信できるようになっている。基地
局１には、従来の装備の他に、上り制御チャネル測定装
置３と初期送信電力算出装置４と初期送信電力設定装置
５とが備えられ、また各移動機２には、下り制御チャネ
ル測定装置６及び初期送信電力設定装置７が備えられて
いる。基地局１には交換機８が有線で接続されている。FIG. 1 shows an outline of a mobile communication system to which a transmission power control method according to the present invention is applied. The base station 1 and each mobile station 2 are connected to the uplink control channel 10 from the mobile station 2 to the base station 1, the downlink control channel 11 from the base station 1 to the mobile station 2, and the mobile station 2 to the base station 1 in the same manner as in the prior art. An uplink communication channel 12 to the mobile station 2 and a downlink communication channel 14 from the base station 1 to the mobile station 2 are set and communication is possible. The base station 1 includes, in addition to the conventional equipment, an uplink control channel measurement device 3, an initial transmission power calculation device 4, and an initial transmission power setting device 5, and each mobile device 2 has a downlink control channel measurement device. A device 6 and an initial transmission power setting device 7 are provided. An exchange 8 is connected to the base station 1 by wire.
【００１１】上り制御チャネル測定装置３は、上り制御
チャネル１０の無線状態、つまり電界強度及びビット誤
り率を測定し、下り制御チャネル測定装置６は、下り制
御チャネル１１の無線状態、つまり電界強度及びビット
誤り率を測定する。初期送信電力算出装置４は、上り制
御チャネル測定装置３によって測定された電界強度及び
ビット誤り率から上り初期送信電力を算出するととも
に、下り制御チャネル測定装置６により測定されて移動
機２より報告された電界強度及びビット誤り率から下り
初期送信電力を算出する。基地局１の初期送信電力設定
装置５は、初期送信電力算出装置４により算出された下
り初期送信電力に従って下り通話チャネル１３の初期送
信電力を設定する。移動機２の初期送信電力設定装置７
は、初期送信電力算出装置４により算出されて基地局１
より報告された上り初期送信電力に従って上り通話チャ
ネル１２の初期送信電力を設定する。The uplink control channel measuring device 3 measures the radio condition of the uplink control channel 10, that is, the electric field strength and the bit error rate, and the downlink control channel measuring device 6 measures the radio condition of the downlink control channel 11, that is, the electric field intensity and the bit error rate. Measure the bit error rate. The initial transmission power calculation device 4 calculates the initial transmission power from the electric field strength and the bit error rate measured by the uplink control channel measurement device 3, and is measured by the downlink control channel measurement device 6 and reported by the mobile device 2. The initial downlink transmission power is calculated from the obtained electric field strength and bit error rate. The initial transmission power setting device 5 of the base station 1 sets the initial transmission power of the downlink communication channel 13 according to the downlink initial transmission power calculated by the initial transmission power calculation device 4. Initial transmission power setting device 7 for mobile device 2
Is calculated by the initial transmission power calculation device 4 and the base station 1
The initial transmission power of the uplink communication channel 12 is set according to the reported uplink initial transmission power.
【００１２】図２のフローチャートは、図１に示した移
動通信システムにおいて、本発明による方法により送信
電力を制御されて通話が開始するまでの動作を示す。図
２において、下り制御チャネル１１及び上り制御チャネ
ル１２が設定されると（ステップＳ１及びＳ２）、基地
局１の上り制御チャネル測定装置３によって上り制御チ
ャネル１０の電界強度及びビット誤り率が複数回測定さ
れ（ステップＳ３）、また移動機２の下り制御チャネル
測定装置６によって下り制御チャネル１１の電界強度及
びビット誤り率が複数回測定され、その測定結果は上り
制御チャネル１０によって基地局１へ報告される（ステ
ップＳ４）。FIG. 2 is a flowchart showing the operation of the mobile communication system shown in FIG. 1 until transmission power is controlled by controlling the transmission power by the method according to the present invention. In FIG. 2, when the downlink control channel 11 and the uplink control channel 12 are set (steps S1 and S2), the electric field strength and the bit error rate of the uplink control channel 10 are increased by the uplink control channel measuring device 3 of the base station 1 a plurality of times. It is measured (step S3), and the electric field strength and the bit error rate of the downlink control channel 11 are measured a plurality of times by the downlink control channel measuring device 6 of the mobile station 2, and the measurement results are reported to the base station 1 by the uplink control channel 10. Is performed (step S4).
【００１３】図３は、上り制御チャネル１０の電界強度
及びビット誤り率をそれぞれ５回ずつ測定した測定例を
示す。この測定例では、電界強度は変化しているが、ビ
ット誤り率については５回とも同じ「０．１」となって
いる。図４は、上り制御チャネル１０の電界強度及びビ
ット誤り率をそれぞれ５回ずつ測定した別の測定例を示
す。この測定例では、電界強度及びビット誤り率の両方
とも変化している。図５は、下り制御チャネル１１の電
界強度及びビット誤り率をそれぞれ５回ずつ測定した測
定例を示す。この測定例では、電界強度は変化している
が、ビット誤り率については５回とも同じ「０．１」と
なっている。図６は、下り制御チャネル１１の電界強度
及びビット誤り率をそれぞれ５回ずつ測定した別の測定
例を示す。この測定例では、電界強度及びビット誤り率
の両方とも変化している。FIG. 3 shows a measurement example in which the electric field strength and the bit error rate of the uplink control channel 10 are measured five times each. In this measurement example, the electric field strength is changed, but the bit error rate is the same “0.1” in all five measurements. FIG. 4 shows another measurement example in which the electric field strength and the bit error rate of the uplink control channel 10 are each measured five times. In this measurement example, both the electric field strength and the bit error rate change. FIG. 5 shows a measurement example in which the electric field strength and the bit error rate of the downlink control channel 11 are measured five times each. In this measurement example, the electric field strength is changed, but the bit error rate is the same “0.1” in all five measurements. FIG. 6 shows another measurement example in which the electric field strength and the bit error rate of the downlink control channel 11 are measured five times each. In this measurement example, both the electric field strength and the bit error rate change.
【００１４】次に、基地局１の初期送信電力設定装置５
は、上り制御チャネル測定装置３によって複数回測定さ
れた上り制御チャネル１０の電界強度及びビット誤り率
のそれぞれの平均を求め、その平均値から上り初期送信
電力を算出する（ステップＳ５）。この場合、例えばル
ックアップテーブル方式により送信電力変換表に当ては
めれば、平均値に対応する上り初期送信電力を容易に求
めることができる。図３の例では、ビット誤り率は変化
していないので、図７に示すように電界強度のみをパラ
メータとした送信電力への変換テーブルから、対応する
送信電力を得ることができる。図３の例の場合には、測
定した５回の電界強度のうち３回目の値が「６０」で異
常に高いので、これを除いた４回分の電界強度を平均す
ると「３２．５」となり、これに対応する送信電力は図
７の変換テーブルから「４」となる。Next, the initial transmission power setting device 5 of the base station 1
Calculates the average of each of the electric field strength and the bit error rate of the uplink control channel 10 measured a plurality of times by the uplink control channel measuring device 3, and calculates the initial uplink transmission power from the average value (step S5). In this case, for example, by applying a lookup table method to the transmission power conversion table, the initial uplink transmission power corresponding to the average value can be easily obtained. In the example of FIG. 3, since the bit error rate does not change, the corresponding transmission power can be obtained from the transmission power conversion table using only the electric field strength as a parameter as shown in FIG. In the case of the example of FIG. 3, the third value out of the five measured electric field intensities is “60”, which is abnormally high. , The corresponding transmission power is “4” from the conversion table of FIG.
【００１５】一方、図４の例では、電界強度及びビット
誤り率の両方とも変化しているが、５回分の電界強度を
平均すると「５１．２」となり、高い値のためビット誤
り率の測定結果のみで送信電力を決定する。図８は、ビ
ット誤り率のみをパラメータとした送信電力への変換テ
ーブルを示す。図４の例の場合には、５回測定したビッ
ト誤り率に異常値がないので５回分の全てを有効とし、
その平均を求めると「０．３８」となるので、これに対
応する送信電力は図８の変換テーブルから「３」とな
る。On the other hand, in the example of FIG. 4, both the electric field strength and the bit error rate change. The transmission power is determined only from the result. FIG. 8 shows a conversion table into transmission power using only the bit error rate as a parameter. In the case of the example of FIG. 4, since there is no abnormal value in the bit error rate measured five times, all five times are valid,
Since the average is "0.38", the transmission power corresponding to this is "3" from the conversion table of FIG.
【００１６】また、基地局１の初期送信電力設定装置５
は、移動機２から報告された下り制御チャネル１１の電
界強度及びビット誤り率のそれぞれの平均を求め、その
平均値から下り初期送信電力を上記と同様に算出する
（ステップＳ６）。図５の例の場合、ビット誤り率につ
いては５回の測定とも同じで、５回の電界強度に異常が
ないので全てを有効とし、その平均を求めると「３６」
となるので、これに対応する送信電力は図７の変換テー
ブルから「４」となる。しかし、５回測定の電界強度が
徐々に高くなっているので、無線状態が良くなっている
との予測を行い、図７の変換テーブルより得た「４」か
ら「１」を差し引いた「３」をもって下り初期送信電力
とする。図６の例では、５回測定の電界強度を平均する
と「５０．６」となり高い値のため、ビット誤り率の測
定結果のみで下り初期送信電力を決定する。この場合、
測定した５回のビット誤り率に異常がないので全てを有
効とし、その平均を求めると「０．１８」となるので、
これに対応する送信電力は図８の変換テーブルから
「２」となる。The initial transmission power setting device 5 of the base station 1
Calculates the average of the electric field strength and the bit error rate of the downlink control channel 11 reported from the mobile station 2, and calculates the initial downlink transmission power from the average in the same manner as described above (step S6). In the case of the example of FIG. 5, the bit error rate is the same for the five measurements, and there is no abnormality in the five field strengths.
Therefore, the transmission power corresponding to this becomes “4” from the conversion table of FIG. However, since the electric field strength of the five measurements has been gradually increased, it is predicted that the wireless condition has been improved, and “3” obtained by subtracting “1” from “4” obtained from the conversion table of FIG. Is used as the downlink initial transmission power. In the example of FIG. 6, the average of the electric field intensities measured five times is “50.6”, which is a high value. Therefore, the downlink initial transmission power is determined only by the measurement result of the bit error rate. in this case,
Since there are no abnormalities in the measured five bit error rates, all are valid, and when the average is obtained, it is "0.18".
The transmission power corresponding to this is “2” from the conversion table of FIG.
【００１７】基地局１は、上記のようにして上り初期送
信電力を算出すると、その値を下り制御チャネル１１に
よって移動機２へ報告する（ステップＳ７）。これを受
信した移動機２では、制御チャネルから通話チャネルへ
の移行時に、報告された上り初期送信電力を上り通話チ
ャネル１２の初期送信電力として上り通話チャネル１２
を設定する（ステップＳ８）。また、基地局１は、初期
送信電力設定装置５で上記のように算出された下り初期
送信電力を、制御チャネルから通話チャネルへの移行時
に下り通話チャネル１３の初期送信電力として下り通話
チャネル１３を設定する（ステップＳ９）。そして、こ
のような初期送信電力をもって通話を開始する（ステッ
プ１０）。After calculating the uplink initial transmission power as described above, the base station 1 reports the value to the mobile station 2 via the downlink control channel 11 (step S7). Upon receiving this, the mobile station 2 uses the reported uplink initial transmission power as the initial transmission power of the uplink traffic channel 12 when transitioning from the control channel to the traffic channel.
Is set (step S8). Also, the base station 1 uses the downlink initial transmission power calculated by the initial transmission power setting device 5 as described above as the initial transmission power of the downlink communication channel 13 when shifting from the control channel to the communication channel. It is set (step S9). Then, a call is started with such initial transmission power (step 10).
【００１８】[0018]
【発明の効果】以上説明したように本発明は、通話チャ
ネルの設定前に、移動機から基地局への上り制御チャネ
ル及び基地局から移動機への下り制御チャネルのそれぞ
れについて、電界強度及びビット誤り率をそれぞれ複数
回測定し、その複数回分の測定データの推移を見て電界
強度又はビット誤り率の一方のデータのみを採り、その
一方の平均値から上り制御チャネル及び下り制御チャネ
ルの初期送信電力を決定し、この後、その初期送信電力
により通話チャネルを確立するので、次のような効果が
ある。As described above, according to the present invention, before setting the communication channel, the electric field strength and the bit strength are set for each of the uplink control channel from the mobile station to the base station and the downlink control channel from the base station to the mobile station. The error rate is measured a plurality of times, and only one of the electric field strength and the bit error rate is taken by observing the transition of the measured data for the plurality of times, and the initial transmission of the uplink control channel and the downlink control channel is performed from the average value of one of the data. Since the power is determined and thereafter the communication channel is established with the initial transmission power, the following effects are obtained.
【００１９】 通話開始前に必要最小の送信電力値が
分かり、通話開始後に適切な送信電力に補正する電力補
正が不要になる。従って、基地局及び移動機の負荷を軽
減でき、また基地局及び移動機の双方とも必要以上の電
力を送信しなくとも良いので、チャネル間の干渉の発生
も防止できる。The minimum required transmission power value is known before the start of a call, and power correction for correcting the transmission power to an appropriate value after the start of a call becomes unnecessary. Therefore, the load on the base station and the mobile device can be reduced, and since both the base station and the mobile device do not need to transmit more power than necessary, the occurrence of interference between channels can be prevented.
【００２０】 電界強度及びビット誤り率のそれぞれ
の変化を判定し、その変化の程度から電界強度とビット
誤り率の一方をパラメータとして採用し、一方の平均値
から上り通話チャネルの初期送信電力及び下り通話チャ
ネルの初期送信電力を決定するので、受信レベル（電界
強度）と品質（ビット誤り率）との両方の変化関係を加
味した、しかもその一方の突然の変化に大きく影響され
ない適切な初期送信電力を設定することができる。The respective changes in the electric field strength and the bit error rate are determined, one of the electric field strength and the bit error rate is adopted as a parameter from the degree of the change, and the initial transmission power and the downlink Since the initial transmission power of the communication channel is determined, an appropriate initial transmission power that takes into account both the relationship between the reception level (field strength) and the quality (bit error rate) and that is not greatly affected by sudden changes in one of them. Can be set.
【図１】本発明の送信電力制御方法を適用する移動通信
システムの一例の概要構成図である。FIG. 1 is a schematic configuration diagram of an example of a mobile communication system to which a transmission power control method of the present invention is applied.
【図２】本発明の送信電力制御方法の一例の動作を示す
フローチャートである。FIG. 2 is a flowchart illustrating an operation of an example of a transmission power control method according to the present invention.
【図３】図１中の上り制御チャネル測定装置で測定され
た上り制御チャネルの無線状態の測定例を示す図であ
る。3 is a diagram illustrating a measurement example of a radio state of an uplink control channel measured by the uplink control channel measuring device in FIG. 1;
【図４】図３の例と同様に測定された上り制御チャネル
の無線状態の別の測定例を示す図である。FIG. 4 is a diagram illustrating another measurement example of the radio state of the uplink control channel measured similarly to the example of FIG. 3;
【図５】図１中の下り制御チャネル測定装置で測定され
た下り制御チャネルの無線状態の測定例を示す図であ
る。5 is a diagram illustrating a measurement example of a radio state of a downlink control channel measured by the downlink control channel measurement device in FIG. 1;
【図６】図５の例と同様に測定された下り制御チャネル
の無線状態の別の測定例を示す図である。FIG. 6 is a diagram illustrating another measurement example of the radio state of the downlink control channel measured similarly to the example of FIG. 5;
【図７】電界強度から送信電力への変換テーブルを示す
図である。FIG. 7 is a diagram showing a conversion table from electric field strength to transmission power.
【図８】ビット誤り率から送信電力への変換テーブルを
示す図である。FIG. 8 is a diagram showing a conversion table from a bit error rate to transmission power.
１ 基地局 ２ 移動機 ３ 上り制御チャネル測定装置 ４ 初期送信電力算出装置 ５ 初期送信電力設定装置 ６ 下り制御チャネル測定装置 ７ 初期送信電力設定装置 ８ 交換機 Reference Signs List 1 base station 2 mobile station 3 uplink control channel measuring device 4 initial transmission power calculating device 5 initial transmission power setting device 6 downlink control channel measuring device 7 initial transmission power setting device 8 exchange
Claims (3)
及びビット誤り率を基地局側で複数回測定する第１のス
テップと、 基地局からの下り制御チャネルの電界強度及びビット誤
り率を移動機側で複数回測定し、その測定結果を前記上
り制御チャネルにより基地局へ報告する第２のステップ
と、 基地局において、上り制御チャネルの測定された複数回
の電界強度及びビット誤り率の推移を見て電界強度又は
ビット誤り率の一方のデータのみを採り、その一方の平
均値から上り初期送信電力を算出する第３のステップ
と、 基地局において、報告された下り制御チャネルの複数回
の電界強度及びビット誤り率の推移を見て電界強度又は
ビット誤り率の一方のデータのみを採り、その一方の平
均値から下り初期送信電力を算出する第４のステップ
と、 算出された上り初期送信電力を前記下り制御チャネルに
よって移動機へ報告する第５のステップと、 移動機において、報告された上り初期送信電力を、制御
チャネルから通話チャネルへの移行時に、上り通話チャ
ネルの初期送信電力として上り通話チャネルを設定する
第６のステップと、 基地局において、算出された下り初期送信電力を、制御
チャネルから通話チャネルへの移行時に、下り通話チャ
ネルの初期送信電力として下り通話チャネルを設定する
第７のステップと、 からなる移動通信システムにおける送信電力制御方法。1. A first step of measuring the electric field strength and bit error rate of an uplink control channel from a mobile station a plurality of times at a base station, and moving the electric field strength and bit error rate of a downlink control channel from the base station. A second step of measuring a plurality of times on the mobile station side and reporting the measurement result to the base station using the uplink control channel; and, in the base station, a change in the measured field strength and bit error rate of the uplink control channel a plurality of times. A third step of taking only one data of the electric field strength or the bit error rate, and calculating the uplink initial transmission power from the average value of one of the data; and A fourth step of taking only one data of the electric field strength or the bit error rate by observing the transition of the electric field strength and the bit error rate, and calculating the downlink initial transmission power from the average value of one of the data. A fifth step of reporting the calculated uplink initial transmission power to the mobile station via the downlink control channel; and, in the mobile station, transmitting the reported uplink initial transmission power at the time of transition from the control channel to the communication channel. A sixth step of setting the uplink communication channel as the initial transmission power of the channel; and, in the base station, converting the calculated downlink initial transmission power as the initial transmission power of the downlink communication channel when shifting from the control channel to the communication channel. A transmission power control method in a mobile communication system, comprising: a seventh step of setting a communication channel.
変化していないときは、電界強度の平均値のみから上り
初期送信電力を算出することを特徴とする請求項１記載
の、移動通信システムにおける送信電力制御方法。2. The mobile communication system according to claim 1, wherein in the third step, when the bit error rate has not changed, the uplink initial transmission power is calculated only from the average value of the electric field strength. Transmission power control method in the embodiment.
変化していないときは、電界強度の平均値のみから下り
初期送信電力を算出することを特徴とする請求項１記載
の、移動通信システムにおける送信電力制御方法。3. The mobile communication system according to claim 1, wherein in the fourth step, when the bit error rate has not changed, the downlink initial transmission power is calculated only from the average value of the electric field strength. Transmission power control method in the embodiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10029934A JP2993561B2 (en) | 1998-02-12 | 1998-02-12 | Transmission power control method in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10029934A JP2993561B2 (en) | 1998-02-12 | 1998-02-12 | Transmission power control method in mobile communication system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7107087A Division JP2944459B2 (en) | 1995-04-07 | 1995-04-07 | Transmission power control method in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10256987A JPH10256987A (en) | 1998-09-25 |
| JP2993561B2 true JP2993561B2 (en) | 1999-12-20 |
Family
ID=12289824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10029934A Expired - Fee Related JP2993561B2 (en) | 1998-02-12 | 1998-02-12 | Transmission power control method in mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2993561B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6963750B1 (en) * | 1998-09-30 | 2005-11-08 | Lucent Technologies Inc. | CDMA power control for paging and initial traffic channel power |
| JP2004056593A (en) * | 2002-07-22 | 2004-02-19 | Canon Inc | Radio communication system |
| CA2564468A1 (en) | 2004-04-30 | 2005-11-24 | Interdigital Technology Corporation | Method and system for controlling transmission power of a downlink signaling channel based on enhanced uplink transmission failure statistics |
-
1998
- 1998-02-12 JP JP10029934A patent/JP2993561B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10256987A (en) | 1998-09-25 |
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