JP3078131B2 - Mobile station transmission power control device - Google Patents
Mobile station transmission power control deviceInfo
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- JP3078131B2 JP3078131B2 JP04284429A JP28442992A JP3078131B2 JP 3078131 B2 JP3078131 B2 JP 3078131B2 JP 04284429 A JP04284429 A JP 04284429A JP 28442992 A JP28442992 A JP 28442992A JP 3078131 B2 JP3078131 B2 JP 3078131B2
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- Japan
- Prior art keywords
- station
- received power
- power
- base station
- set value
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Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】この発明は、符号分割多元接続
（Code Division Multiple Access)通信方式に基づく移
動通信システムにおいて、移動局の送信電力を制御する
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the transmission power of a mobile station in a mobile communication system based on a code division multiple access (Code Division Multiple Access) communication system.
【０００２】[0002]
【従来の技術】符号分割多元接続（Code Division Mult
iple Access)通信方式に基づく移動通信システムにおけ
るリバースリンク（移動局から基地局への接続）では遠
近問題（near-far problem) が生ずる。符号分割多元接
続では、すべて同一周波数帯で通信を行うため、基地局
において、あるひとつの移動局からの信号にとっては、
その他の移動局からの信号は干渉雑音となる。遠近問題
とは、基地局における受信信号電力が、基地局から遠い
移動局からの信号は小さく、基地局から近い移動局から
の信号は大きくなるため、基地局から遠い移動局からの
信号の信号対干渉雑音電力比が小さくなり信号の品質が
劣化してしまうという問題である。そのため、移動局の
送信信号電力を、基地局から遠い移動局では大きく、基
地局から近い移動局では小さくなるように、移動局の送
信信号電力を制御しなければならない。2. Description of the Related Art Code Division Multiple Access
A near-far problem occurs in a reverse link (connection from a mobile station to a base station) in a mobile communication system based on an iple Access communication system. In code division multiple access, since all communication is performed in the same frequency band, at the base station, for a signal from a certain mobile station,
Signals from other mobile stations become interference noise. The near-far problem means that the power of the signal received from the mobile station far from the base station is small because the signal power from the mobile station far from the base station is small and the signal from the mobile station near the base station is large. This is a problem that the interference-to-interference noise power ratio decreases and the signal quality deteriorates. Therefore, it is necessary to control the transmission signal power of the mobile station so that the transmission signal power of the mobile station is large in a mobile station far from the base station and small in a mobile station near the base station.
【０００３】この種の遠近問題については、例えば次記
文献に示される。すなわち、すべての基地局は、それぞ
れの基地局における受信信号電力が予め定めた値（下記
文献では、１．０）となるように、管理下の移動局の送
信信号電力を制御する。この制御方法により、それぞれ
の基地局では管理下の移動局からの信号の信号対干渉雑
音電力比を一定値に揃えることができる。 文献名 Eisuke KUDOH and Tadashi MATSUMOTO:"Effect
of Power Control Error on the System User Capacit
y of DS/CDMA Cellular Mobile Radios",IEICETRANS. C
OMMUN., Vol.E75-B, No.6, June 1992[0003] Such a perspective problem is disclosed in the following document, for example. That is, all base stations control the transmission signal power of the managed mobile station such that the reception signal power at each base station becomes a predetermined value (1.0 in the following document). With this control method, each base station can make the signal-to-interference noise power ratio of the signal from the managed mobile station uniform. Reference Eisuke KUDOH and Tadashi MATSUMOTO: "Effect
of Power Control Error on the System User Capacit
y of DS / CDMA Cellular Mobile Radios ", IEICETRANS. C
OMMUN., Vol.E75-B, No.6, June 1992
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この文
献の方法のみではなお不充分な面がある。すなわち、サ
ービスエリア内で移動局の場所的な分布に疎密がある場
合、移動局の分布が密であるところの基地局ではＳＩＲ
が小さくなり信号の品質が劣化し、一方、移動局の分布
が疎であるところの基地局ではＳＩＲが大きくなり信号
の品質が過剰品質となる。このことは、分布に疎密があ
る場合、それぞれの基地局のＳＩＲの偏りが著しくな
り、システム全体でみると効率が悪くなることを表して
いる。従って、この発明は、受信パワー設定値を適応的
に変化させ、それぞれの基地局でのＳＩＲを可及的に均
一にする送信電力制御装置を提供することを目的とす
る。However, there are still insufficient aspects with the method of this document alone. That is, when the distribution of mobile stations is sparse and dense in the service area, the base station where the distribution of mobile stations is dense is SIR.
Becomes smaller and the signal quality is degraded. On the other hand, in a base station where the distribution of mobile stations is sparse, the SIR increases and the signal quality becomes excessive. This indicates that when the distribution is sparse and dense, the SIR bias of each base station becomes remarkable, and the efficiency of the entire system deteriorates. Accordingly, it is an object of the present invention to provide a transmission power control apparatus that adaptively changes a reception power setting value and makes SIRs at respective base stations as uniform as possible.
【０００５】[0005]
【課題を解決するための手段】この発明は、符号分割多
元接続通信方式に基づいて基地局と移動局との通信が行
われる移動通信システムにおいて用いる移動局送信電力
制御装置に関する。この発明は、自基地局（以下自局と
言う）における総受信パワーを出力する自局総受信パワ
ー観測手段と、隣接している複数の基地局（以下隣接局
と言う）に関する受信パワー設定値対総受信パワー比
（以下パワー比と言う）を出力する隣接局観測手段とを
有する。また、自局の受信パワー設定値と総受信パワー
とから自局のパワー比ＳＩＲｃ（ｉ）を計算し、自局の
当該パワー比ＳＩＲｃ（ｉ）と隣接局のパワー比とを比
較して自局のパワー比ＳＩＲｃ（ｉ）が最小である場
合、隣接局のパワー比の内で最小のものをＳＩＲｍ
（ｉ）して、更新パラメータｋ（ｉ）をｋ（ｉ）＝ＳＩ
Ｒｍ（ｉ）／ＳＩＲｃ（ｉ）なる関係で計算して更新設
定する更新パラメータ演算手段を有する。更に、現時刻
における自局の受信パワー設定値Ｓｃ（ｉ＋１）をＳｃ
（ｉ＋１）＝ｋ（ｉ）×Ｓｃ（ｉ）なる関係で計算して
更新設定する受信パワー設定値更新手段と、管理下の移
動局に対して送信電力制御コマンドを送信して自局の受
信パワーが前記受信パワー設定値Ｓｃ（ｉ＋１）になる
ように制御を行う送信電力制御手段とを有する。The present invention relates to a mobile station transmission power control apparatus used in a mobile communication system in which communication between a base station and a mobile station is performed based on a code division multiple access communication system. The present invention relates to an own station total received power observation means for outputting a total received power at an own base station (hereinafter referred to as own station), and a reception power setting value for a plurality of adjacent base stations (hereinafter referred to as adjacent stations). And adjacent station observation means for outputting a total reception power ratio (hereinafter referred to as a power ratio). Further, the power ratio SIRc (i) of the own station is calculated from the reception power set value of the own station and the total reception power, and the power ratio SIRc (i) of the own station is compared with the power ratio of the adjacent station to determine the self power ratio. If the power ratio SIRc (i) of the station is the minimum, the power ratio of the adjacent stations is determined to be SIRm
(I) Then, the update parameter k (i) is changed to k (i) = SI
There is an update parameter calculation means for calculating and setting the update by the relationship of Rm (i) / SIRc (i). Further, the reception power set value Sc (i + 1) of the own station at the current time is set to Sc
(I + 1) = k (i) × Sc (i), a reception power setting value updating means for calculating and updating and setting, and transmitting a transmission power control command to a mobile station under management to receive the reception power of the own station. Transmission power control means for controlling power so as to become the reception power set value Sc (i + 1).
【０００６】また、望ましくは、この発明の更新パラメ
ータ演算手段に、自局のパワー比ＳＩＲｃ（ｉ）が最大
である場合、隣接局のパワー比の内で最大のものをＳＩ
Ｒｍａｘ（ｉ）して、更新パラメータｋ（ｉ）をｋ
（ｉ）＝ＳＩＲｍａｘ（ｉ）／ＳＩＲｃ（ｉ）なる関係
で計算して、減少して更新設定する機能を追加する。Preferably, when the power ratio SIRc (i) of the own station is the maximum, the maximum power ratio of the adjacent stations is determined by the update parameter calculating means of the present invention.
Rmax (i) and update parameter k (i) by k
(I) = SIRmax (i) / SIRc (i) The function of calculating and decreasing the update setting is added.
【０００７】[0007]
【作用】この発明は、自局総受信パワー観測手段、隣接
局観測手段、更新パラメータ演算手段、及び受信パワー
設定値更新手段によって、自局のパワー比ＳＩＲｃ
（ｉ）が最小である場合、自局のパワー比ＳＩＲｃ
（ｉ）と隣接局の内で最小のパワー比ＳＩＲｍ（ｉ）と
直前の制御時刻の受信パワー設定値Ｓｃ（ｉ）とに基づ
いて、現時刻における自局の受信パワー設定値Ｓｃ（ｉ
＋１）を、Ｓｃ（ｉ＋１）＝（ＳＩＲｍ（ｉ）／ＳＩＲ
ｃ（ｉ））×Ｓｃ（ｉ）なる関係で更新設定する。そし
て、送信電力制御手段から、例えば送信電力アップまた
はダウンのコマンドを各移動局に送信し、各移動局と共
同して、自局での受信パワーが設定値Ｓｃ（ｉ＋１）に
なるように、各移動局の送信電力を制御する。従って、
周りの基地局に比べて自局のパワー比ＳＩＲｃ（ｉ）が
小さい場合、自局の受信パワーが大きくなるように制御
され、その結果、自局の通信品質が向上する。他方、受
信パワーの増加制御は、隣接局にとっては干渉雑音の増
加となるが、自局のパワー比が最小である場合（通信品
質が最も悪い場合）のみに限定していると同時に、複数
ある隣接局の中でパワー比が最小である隣接局を基準に
して、そのパワー比ＳＩＲｍ（ｉ）と同じパワー比とな
るように制御しているため、隣接局への影響はごく限ら
れたものとなり、システム全体での効率は維持されるこ
とになる。According to the present invention, the power ratio SIRc of the own station is obtained by the own station total received power observing means, the adjacent station observing means, the update parameter calculating means and the received power set value updating means.
When (i) is the minimum, the power ratio SIRc of the own station
Based on (i), the minimum power ratio SIRm (i) of the adjacent stations and the received power set value Sc (i) at the immediately preceding control time, the received power set value Sc (i) of the own station at the current time.
+1) is calculated as Sc (i + 1) = (SIRm (i) / SIR
c (i)) × Sc (i). Then, for example, a command to increase or decrease the transmission power is transmitted from the transmission power control means to each mobile station, and in cooperation with each mobile station, the reception power at the own station becomes the set value Sc (i + 1). The transmission power of each mobile station is controlled. Therefore,
When the power ratio SIRc (i) of the own station is smaller than that of the surrounding base stations, control is performed so that the reception power of the own station is increased, and as a result, the communication quality of the own station is improved. On the other hand, the reception power increase control increases the interference noise for the adjacent station, but is limited to only the case where the power ratio of the own station is the smallest (the case where the communication quality is the worst), and there are a plurality of them. Since the power ratio is controlled to be the same as the power ratio SIRm (i) based on the adjacent station having the minimum power ratio among the adjacent stations, the influence on the adjacent station is very limited. Thus, the efficiency of the entire system is maintained.
【０００８】また、自局のパワー比ＳＩＲｃ（ｉ）が最
大である場合、更新パラメータｋ（ｉ）を減少して更新
設定する機能を追加することにより、隣接局に比べて自
局の通信品質が良すぎる場合、受信パワー設定値Ｓｃ
（ｉ＋１）は、自局のパワー比ＳＩＲｃ（ｉ）がパワー
比ＳＩＲｍａｘ（ｉ）と同じになるように、減少設定さ
れ、従って、隣接局に対する干渉雑音が減少し、結果と
して、システム全体としての効率を向上させることがで
きる。Further, when the power ratio SIRc (i) of the own station is the maximum, the function of reducing the update parameter k (i) and setting the update is added, so that the communication quality of the own station is higher than that of the adjacent station. Is too good, the reception power setting value Sc
(I + 1) is set to be reduced so that the power ratio SIRc (i) of the own station becomes the same as the power ratio SIRmax (i), so that the interference noise with respect to the adjacent stations is reduced, and as a result, the system as a whole is reduced. Efficiency can be improved.
【０００９】[0009]
【実施例】図１はこの発明の実施例を示す構成図であ
り、１つの基地局での構成を示したものである。図１に
おいて、１は自局総受信パワー観測部、２は隣接局受信
パワー観測部、３は更新パラメータ演算部、４は受信パ
ワー設定値更新部、５は送信電力制御部であり、隣接局
受信パワー観測部２には、隣接する２基地局からの受信
パワー設定値Ｓ２、Ｓ３及び総受信パワーＩ２、Ｉ３が
入力される。自局総受信パワー観測部１の出力Ｉｃは、
隣接局へ送られ且つ更新パラメータ演算部３に入力さ
れ、隣接局受信パワー観測部２の出力ＳＩＲ２、ＳＩＲ
３は更新パラメータ演算部３に入力され、更新パラメー
タ演算部３の出力ｋは受信パワー設定値更新部４に入力
され、受信パワー設定値更新部４の出力Ｓｃは隣接局へ
送られ並びに更新パラメータ演算部３及び送信電力制御
部５に入力される。FIG. 1 is a block diagram showing an embodiment of the present invention, showing the configuration of one base station. In FIG. 1, reference numeral 1 denotes a local station total received power observing section, 2 denotes an adjacent station received power observing section, 3 denotes an update parameter calculating section, 4 denotes a received power set value updating section, and 5 denotes a transmission power control section. The reception power observation unit 2 receives the reception power setting values S2 and S3 and the total reception powers I2 and I3 from two adjacent base stations. The output Ic of the own station total received power observation unit 1 is
SIR2, SIR output from adjacent station received power observation unit 2
3 is input to the update parameter calculation unit 3, the output k of the update parameter calculation unit 3 is input to the reception power setting value update unit 4, the output Sc of the reception power setting value update unit 4 is sent to the adjacent station, and the update parameter It is input to the calculation unit 3 and the transmission power control unit 5.
【００１０】次に送信電力動作を説明する。制御動作
は、予め定めた一定時間間隔τ毎の離散時刻（Ｔ＝０，
１，２，…，１，……）に行われる。各制御時刻Ｔ＝ｉ
において、自局総受信パワー観測部１は、自局の総受信
パワーの予め定めた一定時間の平均値を観測・演算し、
総受信パワーＩｃ（ｉ）として出力する。隣接局受信パ
ワー観測部２は、隣接局からの受信パワー設定値Ｓ２
（ｉ）、Ｓ３（ｉ）及び総受信パワーＩ２（ｉ）、Ｉ３
（ｉ）とから、各隣接局のパワー比ＳＩＲ２（ｉ）、Ｓ
ＩＲ３（ｉ）を計算し出力する。Next, the transmission power operation will be described. The control operation is performed at discrete times (T = 0,
1, 2, ..., 1, ...). Each control time T = i
, The own station total received power observation unit 1 observes / calculates the average value of the total received power of the own station for a predetermined period of time,
Output as the total reception power Ic (i). The adjacent station reception power observation unit 2 receives the reception power set value S2 from the adjacent station.
(I), S3 (i) and total received power I2 (i), I3
(I), the power ratio SIR2 (i), S
Calculate and output IR3 (i).
【００１１】更新パラメータ演算部３は、自局の受信パ
ワー設定値Ｓｃ（ｉ）と総受信パワーＩｃ（ｉ）とか
ら、自局のパワー比ＳＩＲｃ（ｉ）（＝Ｓｃ（ｉ）／Ｉ
ｃ（ｉ））を計算し、各隣接局のパワー比ＳＩＲ２
（ｉ）、ＳＩＲ３（ｉ）と比較する。そして、自局のパ
ワー比ＳＩＲｃ（ｉ）が最小であった場合、隣接局のパ
ワー比ＳＩＲ２（ｉ）、ＳＩＲ３（ｉ）のうちで最小の
ものＳＩＲｍ（ｉ）を選択し、更新パラメータｋ（ｉ）
を、次式より算出し出力する。 ｋ（ｉ）＝ＳＩＲｍ（ｉ）／ＳＩＲｃ（ｉ） （１）The update parameter calculator 3 calculates the power ratio SIRc (i) (= Sc (i) / I of the own station from the received power set value Sc (i) of the own station and the total received power Ic (i).
c (i)), and calculates the power ratio SIR2 of each adjacent station.
(I) Compare with SIR3 (i). When the power ratio SIRc (i) of the own station is the minimum, the minimum power ratio SIRm (i) of the power ratios SIR2 (i) and SIR3 (i) of the adjacent station is selected, and the update parameter k ( i)
Is calculated and output from the following equation. k (i) = SIRm (i) / SIRc (i) (1)
【００１２】更新パラメータ演算部３は、また、自局の
パワー比ＳＩＲｃ（ｉ）と隣接局のパワー比ＳＩＲ２
（ｉ）、ＳＩＲ３（ｉ）とを比較し、自局のパワー比Ｓ
ＩＲｃ（ｉ）が最大であった場合、隣接局のパワー比Ｓ
ＩＲ２（ｉ）、ＳＩＲ３（ｉ）のうちで最大のものＳＩ
Ｒｍａｘ（ｉ）を選択し、更新パラメータｋ（ｉ）を、
次式により算出し出力する。 ｋ（ｉ）＝ＳＩＲｍａｘ（ｉ）／ＳＩＲｃ（ｉ） （２） なお、自局のパワー比ＳＩＲｃ（ｉ）が隣接局の中間の
値であった場合は、直前の制御時刻の状態を維持させ、
すなわち、ｋ（ｉ）＝１とする。The update parameter calculation unit 3 also calculates the power ratio SIRc (i) of the own station and the power ratio SIR2 of the adjacent station.
(I), SIR3 (i), and the power ratio S of the own station.
If IRc (i) is the maximum, the power ratio S of the adjacent station
The largest SI among IR2 (i) and SIR3 (i)
Select Rmax (i) and update parameter k (i):
It is calculated and output by the following equation. k (i) = SIRmax (i) / SIRc (i) (2) If the power ratio SIRc (i) of the own station is an intermediate value between adjacent stations, the state at the immediately preceding control time is maintained. ,
That is, k (i) = 1.
【００１３】受信パワー設定値更新部４は、直前の制御
時刻の更新パラメータｋ（ｉ）と直前の制御時刻の自局
の受信パワー設定値Ｓｃ（ｉ）とから、現時刻の自局受
信パワー設定値Ｓｃ（ｉ＋１）を次式より算出し出力す
る。 Ｓｄ（ｉ＋１）＝ｋ（ｉ）×Ｓｃ（ｉ） （３） 送信電力制御部５は、受信パワー設定値更新部４の出力
Ｓｃ（ｉ＋１）に基づき、管理下の移動局に対して、受
信パワーがＳｃ（ｉ＋１）となるようなパワーで送信す
るように制御を行う。この動作は、ある移動局からの信
号受信パワーと自局受信パワー設定値Ｓｃ（ｉ＋１）を
比較し、Ｓｃ（ｉ＋１）の方が大きい場合、その移動局
に予め定めた値だけパワーを上げさせるコマンドを送信
し、Ｓｃ（ｉ＋１）の方が小さい場合、その移動局に予
め定めた値だけパワーを下げさせるコマンドを送信す
る。この動作は、管理下にある移動局全てに対して行
い、前述の制御時間間隔τ内で繰り返し高速に行う。The received power setting value updating section 4 calculates the current reception time of the own station from the update parameter k (i) of the immediately preceding control time and the received power setting value Sc (i) of the own station at the immediately preceding control time. The set value Sc (i + 1) is calculated and output from the following equation. Sd (i + 1) = k (i) × Sc (i) (3) Based on the output Sc (i + 1) of the reception power setting value updating unit 4, the transmission power control unit 5 Control is performed so that transmission is performed at such a power that the power becomes Sc (i + 1). This operation compares the signal reception power from a certain mobile station with the own-station reception power set value Sc (i + 1), and when Sc (i + 1) is larger, causes the mobile station to increase the power by a predetermined value. When the command is transmitted and Sc (i + 1) is smaller, the mobile station transmits a command to lower the power by a predetermined value. This operation is performed for all the mobile stations under management, and is repeatedly performed at high speed within the above-described control time interval τ.
【００１４】次に本発明の効果をシミュレーションで示
す。自局の管理下へ隣接局の管理下にある移動局がだん
だんと集まって行き、その後自局の管理下にある移動局
が隣接局に移動し初期状態に戻るような状況を考えてい
る。すなわち、時間と共に、自局付近の移動局の分布が
密となり、隣接局付近の移動局の分布が疎になった後、
前記のとは逆の動作をし初期状態に戻る状況である。図
２のＡに疎密の時間的な変化を示す。同図の横軸は時
刻、縦軸は自局と隣接局の移動局の分布の密度の比を示
す。１．０は偏りがなく均一である状態を示し、値が大
きくなるほど自局付近の移動局の密度が隣接局付近の移
動局の密度より大きくなる事を示す。図２のＢにシミュ
レーション結果を示す。同図の横軸は時刻で、縦軸はＳ
ＩＲ［ｄＢ］を表す。同図の点線は自局でのＳＩＲで、
実績は隣接局でのＳＩＲを表す。同図で改良前と示して
あるのは、従来の技術を用いた場合の結果であり、改良
後と示してあるのは、本発明の方法を用いた場合の結果
である。なお、本シミュレーションでは、電波のパワー
は距離の４乗の逆数に比例して減少するものと仮定し
た。図２から明らかなように、従来の技術を用いた場合
には、移動局の疎密が大きくなるほど、自局のＳＩＲは
劣化し、隣接局のＳＩＲは向上する。一方、本発明によ
る方法では、隣接局の通信における過剰品質を犠牲にす
る事により自局の品質を向上させることが出来る。すな
わち、各基地局毎のＳＩＲが従来技術を用いるより一様
化される。以上の結果より、本発明の有効性が分かる。Next, the effects of the present invention will be shown by simulation. A situation is considered in which mobile stations under the control of the adjacent station gradually gather under the control of the own station, and then the mobile station under the control of the own station moves to the adjacent station and returns to the initial state. That is, over time, after the distribution of mobile stations near the own station becomes dense and the distribution of mobile stations near the adjacent station becomes sparse,
This is a situation where the operation reverses to the above and returns to the initial state. FIG. 2A shows a temporal change in density. In the figure, the horizontal axis indicates time, and the vertical axis indicates the ratio of the density of distribution of mobile stations between the own station and the adjacent station. A value of 1.0 indicates a state in which there is no deviation and is uniform. The larger the value is, the higher the density of mobile stations near the own station is than the density of mobile stations near the adjacent station. FIG. 2B shows a simulation result. The horizontal axis in the figure is time, and the vertical axis is S
Represents IR [dB]. The dotted line in the figure is the SIR of the own station.
The record indicates the SIR at the adjacent station. In the same figure, "before improvement" is the result when the conventional technique is used, and "after improvement" is the result when the method of the present invention is used. In this simulation, it is assumed that the power of the radio wave decreases in proportion to the reciprocal of the fourth power of the distance. As is clear from FIG. 2, when the conventional technique is used, as the density of the mobile station increases, the SIR of the own station deteriorates and the SIR of the adjacent station improves. On the other hand, in the method according to the present invention, the quality of the own station can be improved by sacrificing the excess quality in the communication of the adjacent station. That is, the SIR for each base station is made more uniform than when using the related art. From the above results, the effectiveness of the present invention can be understood.
【００１５】なお、前記実施例においては、自局のパワ
ー比ＳＩＲｃ（ｉ）が隣接局の中間の値であった場合
は、直前の制御時刻の状態を維持させるようにしたが、
自局を含む隣接局のパワー比の平均を計算し、その平均
値があらかじめ定めたしきい値ｔｈ以上であり、しかも
自局のパワー比ＳＩＲｃ（ｉ）もそのしきい値ｔｈ以上
であった場合、次式によって受信パワー設定値Ｓｃ（ｉ
＋１）を減少して更新設定するようにしてもよい。 Ｓｃ（ｉ＋１）＝（ｔｈ／ＳＩＲｃ（ｉ））×Ｓｃ（ｉ） （４）In the above embodiment, when the power ratio SIRc (i) of the own station is an intermediate value between adjacent stations, the state at the immediately preceding control time is maintained.
The average of the power ratios of adjacent stations including the own station is calculated, and the average value is equal to or greater than a predetermined threshold th, and the power ratio SIRc (i) of the own station is equal to or greater than the threshold th. In this case, the reception power setting value Sc (i
+1) may be reduced and updated. Sc (i + 1) = (th / SIRc (i)) × Sc (i) (4)
【００１６】[0016]
【発明の効果】以上、詳細に説明したようにこの発明に
よれば、隣接局との関連において受信パワー設定値を適
応的に変化させ、それぞれの基地局でのＳＩＲが可及的
に均一になるようにしているため、移動局の分布が密で
ある基地局でのＳＩＲを向上させることが出来、システ
ム全体での効率の低下を抑えることが出来る。As described in detail above, according to the present invention, the reception power setting value is adaptively changed in relation to the adjacent station, and the SIR at each base station is made as uniform as possible. Therefore, the SIR at the base station where the distribution of mobile stations is dense can be improved, and a decrease in efficiency of the entire system can be suppressed.
【図１】この発明の一実施例を示す構成図FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】この発明のシミュレーション結果を示すブロッ
ク図FIG. 2 is a block diagram showing a simulation result of the present invention.
１ 自局総受信パワー観測部 ２ 隣接局受信パワー観測部 ３ 更新パラメータ演算部 ４ 受信パワー設定値更新部 ５ 送信電力制御部 1 own station total received power observing section 2 adjacent station received power observing section 3 update parameter calculating section 4 received power set value updating section 5 transmission power control section
フロントページの続き (56)参考文献 特開 平２−192231（ＪＰ，Ａ) 特開 平６−132871（ＪＰ，Ａ) 特表 平４−502841（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/24 - 7/26 102 H04Q 7/00 - 7/38 Continuation of the front page (56) References JP-A-2-192231 (JP, A) JP-A-6-132871 (JP, A) Tables JP-A-4-502841 (JP, A) (58) Fields surveyed (Int .Cl. 7 , DB name) H04B 7/ 24-7/26 102 H04Q 7/ 00-7/38
Claims (1)
地局と移動局との通信が行われる移動通信システムにお
いて用いるものであって、 各制御時刻毎に、自基地局における総受信パワーを出力
する自局総受信パワー観測手段と、 各制御時刻毎に、隣接している複数の基地局に関する受
信パワー設定値対総受信パワー比を出力する隣接局観測
手段と、 直前の制御時刻における自基地局の受信パワー設定値と
前記総受信パワーとから自基地局の受信パワー設定値対
総受信パワー比ＳＩＲｃ（ｉ）を計算し、自基地局の当
該受信パワー設定値対総受信パワー比ＳＩＲｃ（ｉ）と
隣接基地局の前記受信パワー設定値対総受信パワー比と
を比較し、自基地局の前記受信パワー設定値対総受信パ
ワー比ＳＩＲｃ（ｉ）が最小である場合、隣接基地局の
前記受信パワー設定値対総受信パワー比の内で最小のも
のＳＩＲｍ（ｉ）を用い、更新パラメータｋ（ｉ）を、
ｋ（ｉ）＝ＳＩＲｍ（ｉ）／ＳＩＲｃ（ｉ）なる関係で
計算して、更新設定する更新パラメータ演算手段と、 当該更新パラメータｋ（ｉ）と直前の制御時刻の自局の
受信パワー設定値Ｓｃ（ｉ）を用い、現時刻における自
局の受信パワー設定値Ｓｃ（ｉ＋１）を、Ｓｃ（ｉ＋
１）＝ｋ（ｉ）×Ｓｃ（ｉ）なる関係で計算して、更新
設定する受信パワー設定値更新手段と、 管理下の移動局に対して送信電力制御コマンドを送信
し、自局の受信パワーが前記受信パワー設定値Ｓｃ（ｉ
＋１）になるように制御を行う送信電力制御手段とを、 設けたことを特徴とする移動局送信電力制御装置。The present invention is used in a mobile communication system in which communication between a base station and a mobile station is performed based on a code division multiple access communication system, and outputs a total received power at a base station for each control time. An adjacent station observing means for outputting a received power setting value to a total received power ratio for a plurality of adjacent base stations at each control time; and a self base station at the immediately preceding control time. The received power set value of the own base station and the total received power ratio SIRc (i) are calculated from the received power set value of the station and the total received power, and the received power set value of the own base station and the total received power ratio SIRc (i) are calculated. i) and the received power set value to the total received power ratio of the adjacent base station are compared, and if the received power set value to the total received power ratio SIRc (i) of the own base station is the minimum, Previous Using the minimum SIRm (i) among the received power setting value and the total received power ratio, the update parameter k (i) is calculated as follows:
update parameter calculating means for calculating and updating and setting the relation k (i) = SIRm (i) / SIRc (i); and the update parameter k (i) and the reception power setting value of the own station at the immediately preceding control time Using Sc (i), the reception power set value Sc (i + 1) of the own station at the current time is calculated as Sc (i +
1) = k (i) × Sc (i), a receiving power setting value updating means for calculating and updating and setting, and transmitting a transmission power control command to a managed mobile station, and The power is the reception power set value Sc (i
+1) transmission power control means for performing control so as to be +1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04284429A JP3078131B2 (en) | 1992-10-22 | 1992-10-22 | Mobile station transmission power control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04284429A JP3078131B2 (en) | 1992-10-22 | 1992-10-22 | Mobile station transmission power control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06140975A JPH06140975A (en) | 1994-05-20 |
| JP3078131B2 true JP3078131B2 (en) | 2000-08-21 |
Family
ID=17678440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04284429A Expired - Fee Related JP3078131B2 (en) | 1992-10-22 | 1992-10-22 | Mobile station transmission power control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3078131B2 (en) |
-
1992
- 1992-10-22 JP JP04284429A patent/JP3078131B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06140975A (en) | 1994-05-20 |
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