JP2001036463A - Transmission power controller - Google Patents
Transmission power controllerInfo
- Publication number
- JP2001036463A JP2001036463A JP20877799A JP20877799A JP2001036463A JP 2001036463 A JP2001036463 A JP 2001036463A JP 20877799 A JP20877799 A JP 20877799A JP 20877799 A JP20877799 A JP 20877799A JP 2001036463 A JP2001036463 A JP 2001036463A
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- Japan
- Prior art keywords
- transmission power
- value
- coefficient
- mobile station
- total
- 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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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、送信電力制御装置
に関し、特に、スペクトル拡散通信方式を用いる移動通
信システムにおける下りリンク送信電力制御装置に関す
る。The present invention relates to a transmission power control apparatus, and more particularly, to a downlink transmission power control apparatus in a mobile communication system using a spread spectrum communication system.
【０００２】[0002]
【従来の技術】現在、無線伝送路をシェアリングして複
数ユーザによる同時通信を可能とするマルチプルアクセ
ス（多元接続）方式として、符号分割マルチプルアクセ
ス（Ｃｏｄｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａ
ｃｃｅｓｓ：以下、ＣＤＭＡという）方式が注目されて
いる。ＣＤＭＡ方式は、スペクトル拡散技術を使用し
て、同一周波数帯を複数のユーザに割り当てる方式であ
る。ＣＤＭＡ方式において加入者容量を増加させるため
には、高精度の送信電力制御が必須とされる。2. Description of the Related Art At present, a code division multiple access (Code Division Multiple A) is used as a multiple access (multiple access) system for enabling simultaneous communication by a plurality of users by sharing a radio transmission path.
(hereinafter, referred to as CDMA). The CDMA method is a method of using the spread spectrum technique to allocate the same frequency band to a plurality of users. In order to increase the subscriber capacity in the CDMA system, highly accurate transmission power control is essential.
【０００３】ＣＤＭＡ方式における、従来の下りリンク
送信電力制御方法は次のとおりである。移動局内部に
は、受信信号に要求される受信信号対干渉波電力比（Ｓ
ｉｇｎａｌ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｐｏｗｅｒ
Ｒａｔｉｏ：以下、ＳＩＲという）が目標ＳＩＲとして
予め設定されている。ＳＩＲが小さい値ということは、
自己の信号の干渉波電力に対する比率が小さいことを意
味し、ＳＩＲが大きい値ということは、自己の信号の干
渉波電力に対する比率が大きいことを意味する。A conventional downlink transmission power control method in the CDMA system is as follows. In the mobile station, the received signal to interference wave power ratio (S
signal-Interference Power
Ratio: SIR) is set in advance as a target SIR. The small value of SIR means that
A ratio of the own signal to the interference wave power means a small value, and a large SIR means that the ratio of the own signal to the interference wave power is large.
【０００４】移動局は受信信号のＳＩＲを観測し、観測
されたＳＩＲと目標ＳＩＲを比較する。観測されたＳＩ
Ｒが目標ＳＩＲより小さい場合、移動局は送信電力の増
大を指示する送信電力制御命令を基地局に送信する。観
測されたＳＩＲが目標ＳＩＲより大きい場合、移動局は
送信電力の減少を指示する送信電力制御命令を基地局に
送信する。基地局は、この送信電力制御命令に従って、
対応する移動局への送信信号の送信電力を調整する。[0004] The mobile station observes the SIR of the received signal and compares the observed SIR with the target SIR. Observed SI
If R is smaller than the target SIR, the mobile station sends a transmission power control command to increase the transmission power to the base station. If the observed SIR is larger than the target SIR, the mobile station sends a transmission power control command to the base station to instruct the base station to decrease the transmission power. The base station, according to the transmission power control command,
Adjust the transmission power of the transmission signal to the corresponding mobile station.
【０００５】[0005]
【発明が解決しようとする課題】上記の従来の技術に
は、以下の問題がある。The above prior art has the following problems.
【０００６】１つの基地局に対する移動局の数が増加す
ると、各移動局の受信信号のＳＩＲは低下する。各移動
局は、観測された受信信号のＳＩＲが低下すると、各移
動局の目標ＳＩＲに基づいて送信電力の増大を指示する
送信電力制御命令を基地局に送信する。基地局は、各移
動局の送信信号の送信電力を増大する。各移動局にとっ
て、他の移動局への送信信号の送信電力の増大は、さら
なるＳＩＲの低下の原因となり得る。受信信号のＳＩＲ
が低下した移動局は、各移動局の目標ＳＩＲに基づいて
送信電力の増大を指示する送信電力制御命令を基地局に
送信する。この悪循環が繰り返されると、送信電力が増
大されたにもかかわらず、通信品質が劣化する、という
問題が起こる。[0006] As the number of mobile stations for one base station increases, the SIR of the received signal of each mobile station decreases. When the SIR of the received signal decreases, each mobile station transmits to the base station a transmission power control command instructing an increase in transmission power based on the target SIR of each mobile station. The base station increases the transmission power of the transmission signal of each mobile station. For each mobile station, an increase in transmission power of a transmission signal to another mobile station may cause a further decrease in SIR. SIR of received signal
The mobile stations having the reduced transmission power transmit a transmission power control command to instruct the base station to increase the transmission power based on the target SIR of each mobile station. If this vicious cycle is repeated, there arises a problem that the communication quality is deteriorated even though the transmission power is increased.
【０００７】そこで本発明は、上記の問題を解決した送
信電力制御装置を提供することを目的とする。Accordingly, an object of the present invention is to provide a transmission power control device that solves the above-mentioned problem.
【０００８】[0008]
【課題を解決するための手段】本発明では、上記目的を
達成する送信電力制御装置として、基地局から複数の移
動局への送信信号の電力を、前記各移動局からの制御信
号に応じて前記各移動局毎に制御する送信電力制御装置
において、前記送信信号の電力の総和を観測して総送信
電力値を出力する総送信電力観測部と、前記総送信電力
値に応じた係数αを算出する係数演算部と、前記係数α
と前記制御信号とを用いて対応する移動局の新たな送信
電力値を算出し新送信電力値としてそれぞれ出力する複
数の送信電力演算部とを備え、前記複数の送信電力演算
部は、それぞれ、 前記制御信号が電力の減少を示す場
合は、送信電力の増減量の基準となる正数に−１を乗算
して乗算結果を出力し、前記制御信号が電力の増加を示
す場合は、対応する移動局の優先度に従って定められた
優先係数と前記係数αと前記正数との積を前記正数から
減算して減算結果を出力する増減量演算部と、所定時間
前の送信電力値と前記増減量演算部の出力とを加算して
加算結果を前記新送信電力値として出力する加算器と、
前記新送信電力値を前記所定時間だけ遅延させて前記加
算器に出力する遅延回路とを備え、前記優先係数は、０
より大きく１より小さい値で、対応する移動局の通信が
より重要であるほどより０に近い値であることを特徴と
する送信電力制御装置を提供する。According to the present invention, as a transmission power control apparatus for achieving the above object, the power of a transmission signal from a base station to a plurality of mobile stations is controlled in accordance with a control signal from each of the mobile stations. In the transmission power control device controlling for each mobile station, a total transmission power observation unit that outputs a total transmission power value by observing the total power of the transmission signal, and a coefficient α according to the total transmission power value A coefficient calculator for calculating, and the coefficient α
And a plurality of transmission power calculation units that calculate a new transmission power value of the corresponding mobile station using the control signal and output each as a new transmission power value, the plurality of transmission power calculation units, When the control signal indicates a decrease in power, a positive number serving as a reference for the amount of increase or decrease in the transmission power is multiplied by −1, and a multiplication result is output. When the control signal indicates an increase in power, a corresponding An increase / decrease amount calculating unit that subtracts a product of the priority coefficient, the coefficient α, and the positive number determined according to the priority of the mobile station from the positive number and outputs a subtraction result; An adder that adds the output of the increase / decrease amount calculation unit and outputs the addition result as the new transmission power value;
A delay circuit for delaying the new transmission power value by the predetermined time and outputting the delayed value to the adder, wherein the priority coefficient is 0
There is provided a transmission power control apparatus characterized in that the value is larger and smaller than 1, and is closer to 0 as the communication of the corresponding mobile station is more important.
【０００９】[0009]
【発明の実施の形態】本発明の送信電力制御装置につい
て説明する。説明中、本発明の送信電力制御装置を備え
る基地局を基地局Ａと表す。DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission power control device according to the present invention will be described. In the description, a base station including the transmission power control device of the present invention is referred to as a base station A.
【００１０】図１は、本発明の送信電力制御装置のブロ
ック図である。FIG. 1 is a block diagram of a transmission power control device according to the present invention.
【００１１】図１の送信電力制御装置の構成を説明す
る。The configuration of the transmission power control device shown in FIG. 1 will be described.
【００１２】送信電力制御装置は、総送信電力観測部
１、係数演算部２、優先度設定部３、送信電力指示部
４、増減量演算部５−１〜５−Ｎ、加算器６−１〜６−
Ｎ、遅延回路７−１〜７−Ｎ、及び、送信部８−１〜８
−Ｎを備える。Ｎは、基地局Ａが同時接続している移動
局の数である。増減量演算部５−ｋ、加算器６−ｋ、遅
延回路７−ｋ及び送信部８−ｋ（ｋ＝１〜Ｎ）は、対応
する移動局ＭＳkへの送信に用いられる送信電力の制御
に用いられる。The transmission power control device includes a total transmission power observation unit 1, a coefficient calculation unit 2, a priority setting unit 3, a transmission power instruction unit 4, an increase / decrease amount calculation units 5-1 to 5-N, and an adder 6-1. ~ 6-
N, delay circuits 7-1 to 7-N, and transmission units 8-1 to 8
-N. N is the number of mobile stations to which base station A is simultaneously connected. Decrease amount calculation unit 5-k, adder 6-k, the delay circuit 7-k and the transmission unit 8-k (k = 1~N), the control of the transmission power used for transmission to the mobile station MS k corresponding Used for
【００１３】総送信電力観測部１は、基地局Ａの無線エ
リア内にある、全ての移動局への送信電力の総和を観測
し観測値Ｐａを出力する部分である。係数演算部２は観
測値Ｐａに応じて送信電力の増減量の演算に用いる係数
αを算出する部分である。優先度設定部３は各移動局の
優先度に対応する重み係数ｗiを決定し出力する部分で
ある。重み係数ｗ1〜ｗNは、０より大きく１より小さい
値である。重み係数ｗ1〜ｗNは、それぞれ対応する移動
局ＭＳ1〜ＭＳkの優先度が高いほど０に近く、優先度が
低いほど１に近い値である。送信電力指示部４は、各移
動局から転送されてくる各送信電力制御命令を対応する
増減量演算部５−１〜５−Ｎへ要求符号ｓ1〜ｓNとして
出力する部分である。要求符号ｓkは、それが正の値で
ある場合は送信電力増加要求を示し、それが負の値であ
る場合は送信電力減少要求を示す。各送信電力制御命令
は各移動局の必要に応じて送信されるため、各送信電力
制御命令全てが同時に基地局Ａに到達するわけではな
い。The total transmission power observing section 1 is a section for observing the sum of the transmission powers to all the mobile stations within the radio area of the base station A and outputting the observed value Pa. The coefficient calculating unit 2 is a part that calculates a coefficient α used for calculating the amount of increase or decrease in transmission power according to the observed value Pa. The priority setting unit 3 is a part that determines and outputs a weight coefficient w i corresponding to the priority of each mobile station. The weight coefficients w 1 to w N are values larger than 0 and smaller than 1. Weighting coefficients w 1 to w N is close to 0 the higher priority of the mobile station MS 1 to MS k respectively corresponding to a value close to 1 the lower the priority. Transmission power instruction unit 4 is a portion for outputting the transmission power control commands transferred from each mobile station as a request code s 1 ~s N to a corresponding decrease amount calculation unit 5-1 to 5-N. Request code s k, it is when a positive value indicates the transmission power increase request, if it is a negative value indicating the transmission power reduction request. Since each transmission power control command is transmitted as required by each mobile station, not all transmission power control commands reach the base station A at the same time.
【００１４】増減量演算部５−１〜５−Ｎは、新たに要
求符号ｓ1〜ｓNが入力された場合にのみ、優先度設定部
３の出力である重み係数ｗ1〜ｗNと定数δと係数演算部
２の出力である係数αと送信電力指示部４の出力である
要求符号ｓ1〜ｓNとを用いて、各移動局への送信電力の
増減量を計算する回路である。増減量演算部５−１〜５
−Ｎは、新たに要求符号ｓ1〜ｓNが入力されなかった場
合は、０を出力する。定数δは基準となる増減量であ
る。Only when new request codes s 1 to s N are input, the increase / decrease amount calculation units 5-1 to 5-N determine the weight coefficients w 1 to w N output from the priority setting unit 3 and A circuit that calculates the increase or decrease of the transmission power to each mobile station using the constant δ, the coefficient α output from the coefficient calculation unit 2 and the request codes s 1 to s N output from the transmission power instruction unit 4. is there. Increase / decrease amount calculation units 5-1 to 5
-N outputs 0 when new request codes s 1 to s N are not input. The constant δ is a reference increase / decrease amount.
【００１５】遅延回路７−１〜７−Ｎは、入力値を１測
定周期Ｔ遅延して出力する回路である。加算器６−１〜
６−Ｎはそれぞれ増減量演算部５−１〜５−Ｎの出力と
遅延回路７−１〜７−Ｎの出力とを加算して送信電力値
ｐ1〜ｐNとして出力する部分である。送信部８−１〜８
−Ｎは、各移動局ＭＳ1〜ＭＳkへ信号を送信する際、そ
の送信電力を対応する送信電力値ｐ1〜ｐNに従って調整
する。The delay circuits 7-1 to 7-N are circuits for delaying the input value by one measurement period T and outputting the result. Adders 6-1 to
6-N is a portion that adds the outputs of the increase / decrease amount calculation units 5-1 to 5-N and the outputs of the delay circuits 7-1 to 7-N and outputs the sum as transmission power values p 1 to p N. Transmitters 8-1 to 8
−N adjusts the transmission power according to the corresponding transmission power values p 1 to p N when transmitting a signal to each of the mobile stations MS 1 to MS k .
【００１６】図１に示す送信電力制御装置の動作を説明
する。The operation of the transmission power control device shown in FIG. 1 will be described.
【００１７】総送信電力観測部１は、基地局Ａの無線エ
リア内にある全ての移動局への総送信電力を観測する。
総送信電力観測部１は、送信部８−１〜８−Ｎから出力
される信号の測定周期Ｔの間の総送信電力を測定し、そ
の平均値を測定周期Ｔ毎に観測値Ｐａとして出力する。
観測値Ｐａは係数演算部２に入力される。The total transmission power observation unit 1 monitors the total transmission power to all mobile stations within the radio area of the base station A.
The total transmission power observation unit 1 measures the total transmission power during the measurement period T of the signals output from the transmission units 8-1 to 8-N, and outputs the average value as the observation value Pa for each measurement period T I do.
The observation value Pa is input to the coefficient calculator 2.
【００１８】係数演算部２は、観測値Ｐａに対応する係
数αを算出する。算出方法の例として、図２のグラフに
従って係数αを算出する方法と、図３のグラフに従って
係数αを算出する方法とを挙げる。図２のグラフに従う
方法では、観測値Ｐａの範囲に対応して非連続的に係数
αが決められる。例えば、観測値Ｐａが値Ｔｈ２より大
きく、かつ、値Ｔｈ３より小さい場合は、α２が係数α
として出力される。図３のグラフに従う方法では、観測
値Ｐａに対応して連続的に係数αが決められる。いずれ
の場合も、観測値Ｐａが、基地局と移動局との間の通信
に適用され得る最大総送信電力値Ｐｍａｘより大きい場
合、係数αは１となる。係数αは、各移動局に対応する
増減量演算部５−１〜５−Ｎに入力される。The coefficient calculator 2 calculates a coefficient α corresponding to the observed value Pa. Examples of the calculation method include a method of calculating the coefficient α according to the graph of FIG. 2 and a method of calculating the coefficient α according to the graph of FIG. In the method according to the graph of FIG. 2, the coefficient α is determined discontinuously corresponding to the range of the observation value Pa. For example, when the observed value Pa is larger than the value Th2 and smaller than the value Th3, α2 is a coefficient α
Is output as In the method according to the graph of FIG. 3, the coefficient α is determined continuously corresponding to the observed value Pa. In any case, when the observed value Pa is larger than the maximum total transmission power value Pmax applicable to the communication between the base station and the mobile station, the coefficient α is 1. The coefficient α is input to the increase / decrease amount calculation units 5-1 to 5-N corresponding to each mobile station.
【００１９】優先度設定部３は、重み係数ｗkを設定し
て出力する。設定方法の例として、基地局Ａが各移動局
に対する優先度を決定しその優先度に対応する重み係数
ｗkを決める方法と、各移動局が要求したい優先度を基
地局Ａに送信し基地局Ａがその優先度に応じて重み係数
ｗkを決める方法とを挙げる。The priority setting section 3 sets and outputs a weight coefficient w k . As an example of how to set, and sends a method for determining the weight coefficient w k to the base station A corresponding to its priority to determine the priority for each mobile station, the priority each mobile station wishes to request to the base station A base A method in which the station A determines the weight coefficient w k according to the priority is given.
【００２０】基地局Ａが移動局ＭＳkに対する優先度を
決定しその優先度に対応する重み係数ｗkを決める方法
について説明する。A method in which the base station A determines the priority for the mobile station MS k and determines the weight coefficient w k corresponding to the priority will be described.
【００２１】優先度設定部３は、内部に予め、各移動局
ＭＳ1〜ＭＳNと各移動局ＭＳ1〜ＭＳNの契約内容に応じ
た重み係数ｗ1〜ｗkとの対応表をもっている。対応表は
各移動局が基地局Ａのエリアに出入りするたびに書きか
えられる。移動局ＭＳkは基地局Ａのエリア内に入った
ときに、基地局Ａからのパイロットチャネルの検出およ
びシステムチャネルの検出によってシステム同期を確立
する。この後、移動局ＭＳkは基地局Ａにレジストレー
ション（利用者情報・端末情報）を送信する。基地局Ａ
は移動局ＭＳkから受信した端末情報を制御局に送信す
る。制御局は受信した端末情報からその端末利用者が加
入しているサービス内容を検出して基地局Ａに送信す
る。基地局Ａは、優先度設定部３内部の対応表に、その
サービス内容に応じて移動局ＭＳkに対応する重み係数
ｗkを設定する。例えば、移動局ＭＳkが品質を重視する
サービス契約をしている場合、優先度設定部３内部の対
応表では、移動局ＭＳkに対応する重み係数ｗkとして
０．３が設定される。The priority setting unit 3 has in advance a correspondence table between the mobile stations MS 1 to MS N and the weighting factors w 1 to w k according to the contract contents of the mobile stations MS 1 to MS N. . The correspondence table is rewritten each time each mobile station enters and exits the area of the base station A. When the mobile station MS k enters the area of the base station A, it establishes system synchronization by detecting a pilot channel from the base station A and a system channel. Thereafter, the mobile station MS k transmits registration (user information / terminal information) to the base station A. Base station A
Transmits the terminal information received from the mobile station MS k to the control station. The control station detects service contents to which the terminal user has subscribed from the received terminal information and transmits the service contents to the base station A. The base station A sets a weight coefficient w k corresponding to the mobile station MS k in the correspondence table inside the priority setting unit 3 according to the service content. For example, when the mobile station MS k has a service contract emphasizing quality, 0.3 is set as the weight coefficient w k corresponding to the mobile station MS k in the correspondence table inside the priority setting unit 3.
【００２２】この重み係数の設定は各移動局の着信時お
よび発信時に行われる。着信時には、まず、基地局Ａが
移動局ＭＳkの呼び出し信号をエリアに放射する。移動
局ＭＳkが応答メッセージを基地局Ａに送信する。基地
局Ａが応答メッセージを受信した時点で、優先度設定部
３は移動局ＭＳkの重み係数ｗkを増減量演算部５−ｋへ
出力する。発信時には、まず、移動局ＭＳkが通話要求
信号を基地局Ａへ出力する。基地局Ａが通話要求信号を
受信した時点で優先度設定部３は移動局ＭＳkの重み係
数ｗkを増減量演算部５−ｋへ出力する。The setting of the weight coefficient is performed when each mobile station receives and transmits a call. At the time of an incoming call, first, the base station A radiates a paging signal of the mobile station MS k to the area. The mobile station MS k sends a response message to the base station A. When the base station A receives the response message, the priority setting unit 3 outputs the weight coefficient w k of the mobile station MS k to decrease amount calculation unit 5-k. At the time of calling, first, the mobile station MS k outputs a call request signal to the base station A. Priority setting unit 3 at the time when the base station A receives the call request signal and outputs the weight coefficient w k of the mobile station MS k to decrease amount calculation unit 5-k.
【００２３】各移動局が要求したい優先度を基地局Ａに
送信し基地局Ａがその優先度に応じて重み係数ｗkを決
める方法について説明する。[0023] illustrating the transmitted base station A priority to be requested by each mobile station to the base station A method for determining the weight coefficient w k according to the priority.
【００２４】応答メッセージには優先度を表すフラグが
挿入されている。優先度は１〜１０までの１０個の数字
を使って表され、数が多いほうがより重要である。基地
局Ａは応答メッセージ中の優先度を表すフラグから優先
度を取りだして優先度設定部３に送る。優先度設定部３
は優先度の逆数を計算し重み係数ｗkとして増減量演算
部５−ｋへ出力する。A flag indicating the priority is inserted in the response message. The priority is expressed using ten numbers from 1 to 10, and the higher the number, the more important. The base station A extracts the priority from the flag indicating the priority in the response message and sends it to the priority setting unit 3. Priority setting section 3
Outputs to the decrease amount calculation unit 5-k as the weighting factor w k to calculate the inverse of the priorities.
【００２５】各増減量演算部５−１〜５−Ｎには、送信
電力指示部４から要求符号ｓ1〜ｓNも入力される。増減
量演算部５−ｋ（ｋ＝１〜Ｎ）は、新たに要求符号ｓk
が入力された場合、次式を使って、移動局ＭＳkに対す
る送信電力の増減量Δｐkを計算する。The request codes s 1 to s N are also input from the transmission power instruction unit 4 to each of the increase / decrease amount calculation units 5-1 to 5-N. The increase / decrease amount calculation unit 5-k (k = 1 to N) newly adds the required code s k
If is entered, using the following equation to calculate the increase or decrease amount Delta] p k of the transmission power for the mobile station MS k.
【００２６】[0026]
【数１】 ｓk＞０の場合 Δｐk＝δ−ｗk・α・δ ｓk＜０の場合 Δｐk＝−δ 増減量演算部５−ｋ（ｋ＝１〜Ｎ）は、新たに要求符号
ｓkが入力されなかった場合、増減量Δｐkとして０を出
力する。If s k > 0, Δp k = δ−w k · α · δ If s k <0, Δp k = −δ The increase / decrease calculation unit 5-k (k = 1 to N) is newly added. If the request code s k is not input, and outputs 0 as the decrease amount Delta] p k.
【００２７】加算器６−ｋは、増減量Δｐkと遅延回路
７−ｋから出力された１測定周期Ｔ前の送信電力値ｐk
とを加算して加算結果を出力する。加算結果は、移動局
ＭＳkに対する新たな送信電力値ｐkとして送信部８−ｋ
に入力される。また、加算結果は遅延回路７−ｋにも入
力され、測定周期Ｔ後の送信電力値ｐkの計算に用いら
れる。送信部８−ｋは、移動局ＭＳkへの送信信号の送
信電力を送信電力値ｐkに設定する。[0027] The adder 6-k is increased or decreased amount Delta] p k and the delay circuit 7-k 1 measurement period is output from the T before the transmission power value p k
And outputs the addition result. The result of the addition, the transmission unit 8-k as a new transmission power values p k for the mobile station MS k
Is input to Further, the addition result is input to the delay circuit 7-k, is used to calculate the transmission power value p k after measurement period T. Transmitting unit 8-k sets the transmission power of the transmission signal to the mobile station MS k to the transmission power value p k.
【００２８】本発明によれば、基地局Ａから全ての移動
局への送信電力の総和が大きい場合は、その送信電力の
総和が減少するように、増減量Δｐkが更新される。ま
た、増減量Δｐkを、より優先度の高い移動局に対して
はより大きく設定している。すなわち、優先度の低い移
動局への送信電力を下げることで、優先度の高い移動局
の送受信品質が保持しつつ、総送信電力が必要以上に大
きくなるのを防ぐ。According to the invention, if the sum is large transmission power to all the mobile stations from the base station A, the sum of the transmission power so as to reduce, increase or decrease the amount Delta] p k is updated. Moreover, the decrease amount Delta] p k, is set larger for a higher priority mobile station. That is, by lowering the transmission power to the low-priority mobile station, it is possible to maintain the transmission / reception quality of the high-priority mobile station and prevent the total transmission power from becoming unnecessarily large.
【００２９】[0029]
【発明の効果】以上のように本発明の送信電力制御装置
について、以下の効果が得られる。As described above, the following effects can be obtained with the transmission power control device of the present invention.
【００３０】基地局の総送信電力が所定値よりも大きく
なった時、その差の大きさに応じて移動局への送信信号
の送信電力を更新することができる。その結果、移動局
数が増大して干渉電力が大きくなったときでも、全ての
移動局の通信品質が一律に劣化するのを防ぐことができ
る。さらに、際限なく送信電力が増加するのを防ぐこと
ができるため、隣接基地局の無線サービスエリアに与え
る干渉電力の影響を抑制できる。When the total transmission power of the base station becomes larger than a predetermined value, the transmission power of the transmission signal to the mobile station can be updated according to the difference. As a result, even when the number of mobile stations increases and interference power increases, it is possible to prevent the communication quality of all mobile stations from uniformly deteriorating. Further, since it is possible to prevent endless increase in transmission power, it is possible to suppress the influence of interference power on the wireless service area of an adjacent base station.
【００３１】さらに、移動局の優先度に応じた送信電力
の更新を行うことができるため、基地局の総送信電力を
目標総送信電力以下に保ちつつ、重要な通信の品質劣化
を防ぐことができる。また、移動体通信の契約者に品質
の優劣を使った新しいサービスなどを付加することがで
きる。Furthermore, since the transmission power can be updated in accordance with the priority of the mobile station, it is possible to prevent the deterioration of important communication quality while keeping the total transmission power of the base station at or below the target total transmission power. it can. In addition, a new service using quality superiority or the like can be added to a mobile communication contractor.
【図１】本発明の送信電力制御装置のブロック図であ
る。FIG. 1 is a block diagram of a transmission power control device of the present invention.
【図２】観測値Ｐａと係数αとの第1の関係図である。FIG. 2 is a first relationship diagram between an observed value Pa and a coefficient α.
【図３】観測値Ｐａと係数αとの第２の関係図である。FIG. 3 is a second relationship diagram between an observed value Pa and a coefficient α.
１ … 総送信電力観測部 ２ … 係数演算部 ３ … 優先度設定部 ４ … 送信電力指示部 ５−１〜５−Ｎ … 増減量演算部 ６−１〜６−Ｎ … 加算器 ７−１〜７−Ｎ … 遅延回路 ８−１〜８−Ｎ … 送信部 DESCRIPTION OF SYMBOLS 1 ... Total transmission power observation part 2 ... Coefficient calculation part 3 ... Priority setting part 4 ... Transmission power instruction part 5-1 to 5-N ... Increase / decrease amount calculation part 6-1 to 6-N ... Adder 7-1 to 7-N: delay circuit 8-1-1 to 8-N: transmission unit
Claims (2)
電力を、前記各移動局からの制御信号に応じて前記各移
動局毎に制御する送信電力制御装置において、 前記送信信号の電力の総和を観測して総送信電力値を出
力する総送信電力観測部と、 前記総送信電力値に応じた係数αを算出する係数演算部
と、 前記係数αと前記制御信号とを用いて対応する移動局の
新たな送信電力値を算出し新送信電力値としてそれぞれ
出力する複数の送信電力演算部とを備え、 前記複数の送信電力演算部は、それぞれ、 前記制御信号が電力の減少を示す場合は、送信電力の増
減量の基準となる正数に−１を乗算して乗算結果を出力
し、前記制御信号が電力の増加を示す場合は、対応する
移動局の優先度に従って定められた優先係数と前記係数
αと前記正数との積を前記正数から減算して減算結果を
出力する増減量演算部と、 所定時間前の送信電力値と前記増減量演算部の出力とを
加算して加算結果を前記新送信電力値として出力する加
算器と、 前記新送信電力値を前記所定時間だけ遅延させて前記加
算器に出力する遅延回路とを備え、 前記優先係数は、０より大きく１より小さい値で、対応
する移動局の通信がより重要であるほどより０に近い値
であることを特徴とする送信電力制御装置。1. A transmission power control device for controlling the power of a transmission signal from a base station to a plurality of mobile stations for each mobile station according to a control signal from each of the mobile stations, comprising: A total transmission power observation unit that outputs a total transmission power value by observing the sum of the above, a coefficient calculation unit that calculates a coefficient α according to the total transmission power value, and a correspondence using the coefficient α and the control signal. A plurality of transmission power calculation units that calculate a new transmission power value of the mobile station to perform and output the new transmission power value, respectively, wherein the plurality of transmission power calculation units each indicate that the control signal indicates a decrease in power. In this case, the result of multiplication is output by multiplying a positive number serving as a reference of the amount of increase or decrease in transmission power by −1, and when the control signal indicates an increase in power, the result is determined according to the priority of the corresponding mobile station. Product of the priority coefficient, the coefficient α, and the positive number An increase / decrease amount calculating unit that outputs a subtraction result by subtracting from the positive number; and an addition that adds a transmission power value obtained a predetermined time ago and an output of the increase / decrease amount calculation unit and outputs an addition result as the new transmission power value And a delay circuit that delays the new transmission power value by the predetermined time and outputs the delayed value to the adder, wherein the priority coefficient is a value greater than 0 and less than 1, and communication of the corresponding mobile station is more efficient. A transmission power control device characterized in that the value is closer to 0 as it becomes more important.
いて、 前記係数演算部は、 前記総送信電力値が所定値以下である場合は、前記係数
αを０とし、 前記総送信電力値が前記所定値より大きく、かつ、可能
な総送信電力値の最大値より小さい場合は、前記係数α
を０より大きく１より小さい値とし、かつ、前記総送信
電力値がより大きいほど前記係数αを１により近い値と
し、 前記総送信電力値が前記最大値以上である場合は、前記
係数αを１とすることを特徴とする送信電力制御装置。2. The transmission power control device according to claim 1, wherein the coefficient calculation unit sets the coefficient α to 0 when the total transmission power value is equal to or less than a predetermined value, and sets the total transmission power value to If the value is larger than the predetermined value and smaller than the maximum value of the total possible transmission power value, the coefficient α
Is set to a value larger than 0 and smaller than 1, and the coefficient α is set to a value closer to 1 as the total transmission power value is larger. When the total transmission power value is equal to or more than the maximum value, the coefficient α is set to 1. A transmission power control device, which is set to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20877799A JP2001036463A (en) | 1999-07-23 | 1999-07-23 | Transmission power controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20877799A JP2001036463A (en) | 1999-07-23 | 1999-07-23 | Transmission power controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001036463A true JP2001036463A (en) | 2001-02-09 |
Family
ID=16561934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20877799A Withdrawn JP2001036463A (en) | 1999-07-23 | 1999-07-23 | Transmission power controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001036463A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002019568A1 (en) * | 2000-08-29 | 2002-03-07 | Matsushita Electric Industrial Co., Ltd. | Base station device, control station device, and transmission power control method |
| WO2005083909A1 (en) * | 2004-03-01 | 2005-09-09 | Nec Corporation | Wireless base station unit and transmission power control method |
| JP2009500907A (en) * | 2005-06-30 | 2009-01-08 | アダプティクス、インク | System and method for channel assignment to reduce radio network interference and increase capacity |
| KR100933322B1 (en) * | 2001-10-17 | 2009-12-22 | 콸콤 인코포레이티드 | Choosing the best transmission format for transmission over an allotted time period |
| JP4858644B2 (en) * | 2008-03-07 | 2012-01-18 | 日本電気株式会社 | Radio base station, MBMS radio base station system, transmission power determination method, and transmission power control method |
| US8228809B1 (en) | 2007-12-21 | 2012-07-24 | Adaptix, Inc. | Intelligent mode switching in communication networks |
| US8396153B1 (en) | 2004-12-07 | 2013-03-12 | Adaptix, Inc. | Cooperative MIMO in multicell wireless networks |
-
1999
- 1999-07-23 JP JP20877799A patent/JP2001036463A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7054655B2 (en) | 2000-08-29 | 2006-05-30 | Matsushita Electric Industrial Co., Ltd. | Base station device, control station device, and transmission power control method |
| WO2002019568A1 (en) * | 2000-08-29 | 2002-03-07 | Matsushita Electric Industrial Co., Ltd. | Base station device, control station device, and transmission power control method |
| KR100933322B1 (en) * | 2001-10-17 | 2009-12-22 | 콸콤 인코포레이티드 | Choosing the best transmission format for transmission over an allotted time period |
| WO2005083909A1 (en) * | 2004-03-01 | 2005-09-09 | Nec Corporation | Wireless base station unit and transmission power control method |
| US7457632B2 (en) | 2004-03-01 | 2008-11-25 | Nec Corporation | Radio base station apparatus and transmission power control method |
| US8396153B1 (en) | 2004-12-07 | 2013-03-12 | Adaptix, Inc. | Cooperative MIMO in multicell wireless networks |
| US8897796B2 (en) | 2005-06-30 | 2014-11-25 | Microsoft Corporation | Ordered list channel assignments |
| JP2009500907A (en) * | 2005-06-30 | 2009-01-08 | アダプティクス、インク | System and method for channel assignment to reduce radio network interference and increase capacity |
| US9055598B2 (en) | 2005-06-30 | 2015-06-09 | Microsoft Technology Licensing, Llc | Systems and methods for making channel assignments to reduce interference and increase capacity of wireless networks |
| US9055597B2 (en) | 2005-06-30 | 2015-06-09 | Microsoft Technology Licensing, Llc | Systems and methods for making channel assignments to reduce interference and increase capacity of wireless networks |
| US9756648B2 (en) | 2005-06-30 | 2017-09-05 | Microsoft Technology Licensing, Llc | Systems and methods for making channel assignments to reduce interference and increase capacity of wireless networks |
| US8228809B1 (en) | 2007-12-21 | 2012-07-24 | Adaptix, Inc. | Intelligent mode switching in communication networks |
| JP4858644B2 (en) * | 2008-03-07 | 2012-01-18 | 日本電気株式会社 | Radio base station, MBMS radio base station system, transmission power determination method, and transmission power control method |
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