JP2944459B2 - Transmission power control method in a mobile communication system - Google Patents

Transmission power control method in a mobile communication system

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JP2944459B2
JP2944459B2 JP7107087A JP10708795A JP2944459B2 JP 2944459 B2 JP2944459 B2 JP 2944459B2 JP 7107087 A JP7107087 A JP 7107087A JP 10708795 A JP10708795 A JP 10708795A JP 2944459 B2 JP2944459 B2 JP 2944459B2
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transmission power
control channel
initial transmission
uplink
base station
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JPH08280064A (en
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修一 中野
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日本電気株式会社
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【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】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。 The present invention relates to a mobile communication system for performing radio communication between a base station and a mobile station, to transmission power control method for controlling power during transmission.

【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。 Conventionally, for example, transmission power control method as described in the following publications are known. 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。 The amount detecting a bit error rate of a signal transmitted from the transmitter of JP-A-5-244056 discloses a transmitting station, the bit error rate, in the following cases the first threshold which defines the transmission power of the transmitter in advance only reduced, in the case of the first threshold value or more larger than the second threshold value is increased by an amount that defines the transmit power in advance. 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、 Mobile station for each Hei 3-231523 discloses a plurality of outgoing control channel leave notification in advance the mobile station maximum and minimum values ​​of the transmission power to be accessed,
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。 Mobile station performs access by calling the control channel with the minimum transmission power at the time of a transmission, when communication with the radio base and the control signal is unsuccessful, the mobile station sequentially stepwise increasing the transmission power up to the maximum value of the transmission power an access Te. 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。 JP 58-178637 discloses a radio base station to fit to control the transmission power to the mobile, the transmission power of the radio base station is also controlled simultaneously.

【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。 [SUMMARY OF THE INVENTION] However, conventional methods, an initial set power of the uplink and downlink speech channels has become a certain predetermined fixed value, after the transition to the speech channel, to stabilize to the correct transmit power one that has been power controlled for, 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。 An object of the present invention, prior to setting the traffic channel, and eliminates the need for correction of the post of the transmission power to determine the appropriate transmission power to the call, as well as reduce the load on the base station and mobile station, requires to provide a transmission power control method or the occurrence of interference between channels by transmitting power can be prevented, and can set an appropriate initial transmission power to a mobile station radio state is in an unstable location .

【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。 Transmission power control method of the present invention, in order to solve the problems] determines the initial transmission power of the initial transmission power and the downlink speech channel of the uplink traffic channel in the next 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。 [0006] The first step of measuring a plurality of times the electric field intensity and the bit error rate of the uplink control channel from the mobile station at the base station side. 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。 The field strength and bit error rate of the downlink control channel from the base station measured multiple times at the mobile unit side, a second step of reporting to the base station of the measurement result by the uplink control channel. 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それぞれの平均を求め、その両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。 In the base station, a third step of calculating the uplink initial transmission power to the average of each measured multiple field strength and bit error rate of the uplink control channel determined from the average value of both. 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それぞれの平均を求め、その両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。 In the base station, a plurality of times of the respective determined average field strength and bit error rate, a fourth step of calculating a downlink initial transmission power from the average value of both the reported downlink control channel. 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。 A fifth step of reporting to the mobile station the calculated uplink initial transmission power by the downlink control channel. 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。 In the mobile station, the uplink initial transmission power reported, during the transition from the control channel to the speech channel, a sixth step of setting the uplink traffic channel as the initial transmission power of the uplink communication channel. 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。 In the base station, a downlink initial transmission power calculated at the time of transition from the control channel to the speech channel, a seventh step of setting a downlink speech channel as the initial transmission power of the downlink speech channel.

【0007】 [0007]

【実施例】以下、本発明の実施例を図面を参照して説明する。 EXAMPLES Hereinafter, an embodiment of the present invention with reference to the drawings.

【0008】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。 [0008] FIG 1 shows an overview of a mobile communication system employing a transmission power control method according to the present invention. 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。 The base station 1 and the mobile station 2, conventional uplink control channel 10 similarly 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, the mobile station 2 base station 1 from uplink traffic channel 12, so that can communicate by setting the downlink speech channel 14 to the mobile station 2 from the base station 1 to. 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。 The base station 1, in addition to the conventional equipment, an uplink control channel measurement unit 3 and the initial transmission power calculation device 4 and the initial transmit power setting device 5 is provided, also in the mobile station 2, the downlink control channel measurement 6 and initial transmission power setting unit 7 is provided. 基地局1には交換機8が有線で接続されている。 Switch 8 is connected by wire to the base station 1.

【0009】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。 [0009] uplink control channel measuring device 3, the radio state of the uplink control channel 10, that is to measure the field strength and bit error rate, downlink control channel measuring device 6, the radio state of the downlink control channel 11, i.e. the electric field strength and to measure the bit error rate. 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。 Initial transmission power calculation device 4, calculates the uplink initial transmission power from the electric field strength and the bit error rate measured by the uplink control channel measurement unit 3, is reported from the mobile station 2 is measured by the downlink control channel measuring device 6 and calculating a downlink initial transmission power from the electric field strength and bit error rate. 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。 Initial transmission power setting device of the base station 1 5 sets initial transmission power of the downlink traffic channel 13 in accordance with a downlink initial transmission power calculated by the initial transmission power calculation device 4. 移動機2の初期送信電力設定装置7 Initial transmission power setting device of the mobile station 2 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 The base station 1 is calculated by the initial transmission power calculation device 4
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。 Setting the initial transmission power of the uplink communication channel 12 according to the uplink initial transmission power which is more reported.

【0010】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。 [0010] The flowchart of FIG. 2 in the mobile communication system shown in FIG. 1, illustrating the operation of the up call is controlled transmission power is started by the process according to the invention. 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)。 2, when the downlink control channel 11 and the uplink control channel 12 is set (Step S1 and S2), a plurality field strength and bit error rate of the uplink control channel 10 times the uplink control channel measuring unit 3 of the base station 1 is measured (step S3), and also the electric field strength and the bit error rate of the mobile station 2 of the downlink control channel measuring device 6 by the downlink control channel 11 is measured a plurality of times, the measurement result is reported to the base station 1 by the uplink control channel 10 It is (step S4).

【0011】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。 [0011] Figure 3 shows a measurement example of measuring the field strength and the bit error rate of the uplink control channel 10 five times, respectively. 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。 In this measurement example, the field intensity has changed, it has also become 5 times the same "0.1" for the bit error rate. 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。 Figure 4 shows another measurement example of measuring the field strength and the bit error rate of the uplink control channel 10 five times, respectively. 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。 In this measurement example, it is changing both the field strength and bit error rate. 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。 Figure 5 shows a measurement example of measuring the field strength and the bit error rate of the downlink control channel 11 five times, respectively. 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。 In this measurement example, the field intensity has changed, it has also become 5 times the same "0.1" for the bit error rate. 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。 Figure 6 shows another measurement example of measuring the field strength and the bit error rate of the downlink control channel 11 five times, respectively. 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。 In this measurement example, it is changing both the field strength and bit error rate.

【0012】次に、基地局1の初期送信電力設定装置5 [0012] Next, the initial transmission power setting unit of the base station 1 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)。 Calculates the respective average electric field intensity and the bit error rate of the uplink control channel 10, which is measured a plurality of times by the uplink control channel measurement unit 3, and calculates the uplink initial transmission power from the average value (step 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。 In this case, for example, if Atehamere a lookup table system to transmit power conversion table, it is possible to determine the uplink initial transmission power corresponding to the average value easily.

【0013】また、基地局1の初期送信電力設定装置5 Further, the initial transmission power setting unit of the base station 1 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)。 Calculates the respective average electric field intensity and the bit error rate of the downlink control channel 11 reported from the mobile device 2, it calculates the downlink initial transmission power in the same manner as described above from the average value (step 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」 For example in FIG. 5, the bit error rate the same with 5 measurements, and enable all because there is no abnormality in the five field strength, when obtaining the average "36"
となる。 To become.

【0014】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)。 [0014] The base station 1, when calculating the uplink initial transmission power as described above, to report to the mobile station 2 by the downlink control channel 11 the value (step 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 In the mobile station 2 has received this, during the transition from the control channel to the speech channel, an uplink traffic channel reported the uplink initial transmission power as the initial transmission power of the uplink communication channel 12 12
を設定する(ステップS8)。 Setting (step 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)。 Further, the base station 1, the downlink initial transmission power in the initial transmission power setting unit 5 is calculated as described above, the downlink speech channel 13 during the transition from the control channel to the speech channel as the initial transmission power of the downlink speech channel 13 set (step 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)。 Then, to start a call with such an initial transmission power (step 10).

【0015】なお、上述の実施例では、ルックアップテーブル方式によって初期送信電力を求めたが、測定した電界強度及びビット誤り率の両方から初期送信電力を変換式を用いて算出することもできる。 [0015] In the embodiments described above have determined the initial transmission power by a look-up table method can also be calculated using the initial transmit power from both the measured field strength and bit error rate conversion equation.

【0016】 [0016]

【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てそれぞれの平均値を求め、両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。 The present invention described above, according to the present invention, before setting of the calling channel, for each of the downlink control channel to the mobile station from the uplink control channel and the base station from the mobile station to the base station, the field intensity and bit determine the respective average values ​​of the error rate were measured a plurality of times, both to determine the initial transmission power of the initial transmission power and the downlink speech channel of the uplink communication channel from the mean value, after which the traffic channel by its initial transmit power because to establish, it has the following effects.

【0017】 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。 The call start before find the minimum transmission power value necessary, the power correction to correct the appropriate transmission power becomes unnecessary after the call is initiated. 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。 Therefore, it is possible to reduce the load of the base station and mobile station, and since more power than necessary both base station and mobile station may not transmit, it is possible to prevent occurrence of interference between channels.

【0018】 電界強度及びビット誤り率のそれぞれの変化を判定し、電界強度及びビット誤り率の両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。 [0018] determines the respective changes in electric field strength and bit error rate, because it determines the initial transmission power of the initial transmission power and the downlink speech channel of the uplink communication channel from the average value of both the field strength and the bit error rate, received level in consideration of the both changes relationships (field strength) and quality (bit error rate), yet it is possible to set an appropriate initial transmission power is not greatly affected by the sudden change in its one.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【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。 1 is an example schematic configuration diagram of a mobile communication system employing a transmission power control method of the present invention.

【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。 Is a flowchart illustrating the operation of one example of a transmission power control method of the present invention; FIG.

【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 showing an example of measurement of radio conditions of the measured uplink control channel in the uplink control channel measuring device in FIG.

【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。 4 is a diagram showing another example of measuring radio state of the uplink control channel measured as in the example of FIG.

【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 showing an example of measurement of radio conditions of the measured downlink control channel in the downlink control channel measuring device in FIG.

【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。 6 is a diagram showing another example of measuring radio state of the downlink control channel measured as in the example of FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

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 1 the base station 2 to the mobile device 3 uplink control channel measuring unit 4 initial transmission power calculation device 5 initial transmission power setting device 6 downlink control channel measuring device 7 initial transmission power setting unit 8 exchange

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】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それぞれの平均を求め、 A first step of measuring a plurality of times by 1. A base station side field strength and bit error rate of the uplink control channel from the mobile station, the field strength and the bit error rate of the downlink control channel from the base station and mobile measured multiple times in the machine side, and a second step of reporting the measurement result to the base station by the uplink control channel, in the base station, each of the field strength and the bit error rate of a plurality of times measured uplink control channel the average asking of,
    その両方の平均値から上り初期送信電力を算出する第3 Third calculating the uplink initial transmission power from the average value of both
    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それぞれの平均を求め、 Determined the steps of, in the base station, a plurality of respective average electric field intensity and the bit error rate of the reported downlink control channel,
    その両方の平均値から下り初期送信電力を算出する第4 4 for calculating a downlink initial transmission power from the average value of both
    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。 A step of, a fifth step of reporting the uplink initial transmission power to the mobile station by the downlink control channel which is calculated in the mobile station, the uplink initial transmission power reported, during the transition from the control channel to the speech channel a sixth step of setting an uplink traffic channel as the initial transmission power of the uplink communication channel, in the base station, a downlink initial transmission power calculated at the time of transition from the control channel to the speech channel, the downlink speech channel initial transmission seventh and step of the transmission power control method in a mobile communication system comprising a setting a downlink speech channel as power.
JP7107087A 1995-04-07 1995-04-07 Transmission power control method in a mobile communication system Expired - Fee Related JP2944459B2 (en)

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WO1998047246A1 (en) 1997-04-17 1998-10-22 Ntt Mobile Communications Network Inc. Base station apparatus of mobile communication system
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JP3109504B2 (en) 1998-03-27 2000-11-20 日本電気株式会社 Adjacent frequency interference avoiding method and mobile station of a cellular system and cellular system
US6266527B1 (en) * 1998-04-28 2001-07-24 Ericsson Inc. System and method for measuring power and bit error rate on the up-link and down-link simultaneously
JP2000349740A (en) * 1999-06-08 2000-12-15 Matsushita Electric Ind Co Ltd Transmitter-receiver
JP2004187247A (en) * 2002-10-08 2004-07-02 Matsushita Electric Ind Co Ltd Base station device and communication terminal device
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