JP4821431B2 - Wireless system, base station, portable terminal, base station power control method used therefor, and program thereof - Google Patents

Wireless system, base station, portable terminal, base station power control method used therefor, and program thereof Download PDF

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JP4821431B2
JP4821431B2 JP2006137146A JP2006137146A JP4821431B2 JP 4821431 B2 JP4821431 B2 JP 4821431B2 JP 2006137146 A JP2006137146 A JP 2006137146A JP 2006137146 A JP2006137146 A JP 2006137146A JP 4821431 B2 JP4821431 B2 JP 4821431B2
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高志 唯木
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本発明は無線システム、基地局、携帯端末及びそれらに用いる基地局電力制御方法並びにそのプログラムに関し、特にＷ−ＣＤＭＡ（Ｗｉｄｅｂａｎｄ−Ｃｏｄｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）無線システムにおける基地局電力制御の方法に関する。   The present invention relates to a radio system, a base station, a mobile terminal, a base station power control method used therefor, and a program thereof, and more particularly, to a base station power control method in a W-CDMA (Wideband-Division Multiple Access) radio system.

従来、無線システムにおいては、個別チャネル通信における基地局電力制御を携帯端末毎に行っており（例えば、特許文献１参照）、各携帯端末毎に基地局電力をなるべく低く抑えるような制御がなされている。しかしながら、従来の基地局電力制御方法では、トラフィックや接続回線数等、動的に変化する基地局状態を反映した電力制御を行えていない。   Conventionally, in a wireless system, base station power control in dedicated channel communication is performed for each mobile terminal (see, for example, Patent Document 1), and control is performed to keep the base station power as low as possible for each mobile terminal. Yes. However, in the conventional base station power control method, power control that reflects dynamically changing base station conditions such as traffic and the number of connection lines cannot be performed.

例えば、個別チャネル通信中の端末が少なく、システム容量に十分な空きがある場合には、必ずしも各携帯端末への送信電力を下げる必要はなく、むしろ送信電力を確保して品質を優先することも可能である。また逆に、システム容量に空きがない場合には、送信電力を下げられる携帯端末に関しては、その携帯端末の目標品質が確保できる範囲内で極力迅速に送信電力を抑える必要が生じる。   For example, if there are few terminals in individual channel communication and there is enough space in the system capacity, it is not always necessary to reduce the transmission power to each mobile terminal, but rather the transmission power is secured and priority is given to quality. Is possible. Conversely, when there is no available system capacity, it is necessary to suppress the transmission power as quickly as possible within a range in which the target quality of the mobile terminal can be secured for a mobile terminal whose transmission power can be reduced.

しかしながら、現状の無線システムにおいては、各携帯端末が自端末への電力制御の情報のみしか把握していないため、上記のようなシステムの状況には対応できていない状況がある。   However, in the current wireless system, since each mobile terminal only grasps information on power control to the own terminal, there is a situation where the above-described system situation cannot be handled.

特開２００２−１５２１２７号公報JP 2002-152127 A

しかしながら、上述した従来の基地局電力制御方法では、基地局側のシステム容量（送信電力の余剰状況）によっては、必ずしも各携帯端末で部分最適化されなくてもよい場合や逆に即座に電力を下げる必要がある場合等がある。例えば、個別チャネル通信中の携帯端末が少なくシステム容量に十分な空きがある場合には、各携帯端末への送信電力を確保して品質を優先することも可能である。また逆に、システム容量に空きがない場合には、送信電力を下げられる携帯端末に関しては、極力迅速に送信電力を抑える必要がある。   However, in the conventional base station power control method described above, depending on the system capacity on the base station side (the surplus situation of transmission power), it is not always necessary to partially optimize each mobile terminal, or conversely, It may be necessary to lower it. For example, when there are few portable terminals performing individual channel communication and there is sufficient space in the system capacity, priority can be given to quality by securing transmission power to each portable terminal. Conversely, when there is no available system capacity, it is necessary to suppress transmission power as quickly as possible for portable terminals that can reduce transmission power.

このように、システム容量等の基地局側状態に応じた電力制御を柔軟に行うことができれば、それぞれのケースにおいて目的に応じた全体最適化が可能であるが、現状の無線システムにおいては、上述したように、各携帯端末が自端末への電力制御の情報のみしか把握していないため、刻々と変化しているシステムの状況には対応できていない状況がある。   Thus, if power control according to the base station side state such as system capacity can be flexibly performed, overall optimization according to the purpose is possible in each case. As described above, since each mobile terminal knows only the power control information for its own terminal, there is a situation where it is not possible to cope with the system status that is changing every moment.

また、基地局側でシステム容量等を判断して、同時に個々の携帯端末への電力制御を行うことはその制御の複雑性より実現は難しい。   In addition, it is difficult to realize the system capacity and the like on the base station side and simultaneously control the power to individual mobile terminals due to the complexity of the control.

そこで、本発明の目的は上記の問題点を解消し、基地局電力制御を基地局の状態に応じて基地局（セル）全体で最適化することができる無線システム、基地局、携帯端末及びそれらに用いる基地局電力制御方法並びにそのプログラムを提供することにある。   Therefore, an object of the present invention is to solve the above-described problems and to optimize the base station power control in the entire base station (cell) according to the state of the base station, the base station, the portable terminal, and those It is to provide a base station power control method and program for use in the above.

本発明による無線システムは、基地局が、携帯端末からのコマンドに従ってその携帯端末への送信電力を制御する無線システムであって、
前記基地局は、システム残容量より算出した前記携帯端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として生成する手段と、その生成した基地局情報をブロードキャストにて自セル内の全ての携帯端末に通知する手段とを備え、
前記携帯端末は、前記基地局情報の受信時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う手段を備えている。 A radio system according to the present invention is a radio system in which a base station controls transmission power to a mobile terminal according to a command from the mobile terminal,
The base station uses a coefficient according to a T-SIR (Signal-to-Interference Ratio) reduction rate of the mobile terminal power control processing calculated from the system remaining capacity for controlling the transmission power. Means for generating as information, and means for notifying all the mobile terminals in the own cell by broadcasting the generated base station information,
The portable terminal includes means for weighting normal transmission power control using the base station information when receiving the base station information and controlling transmission power according to the status of the base station.

本発明による基地局は、携帯端末からのコマンドに従ってその携帯端末への送信電力を制御する基地局であって、
システム残容量より算出した前記携帯端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として生成する手段と、その生成した基地局情報をブロードキャストにて自セル内の全ての携帯端末に通知する手段とを備えている。 A base station according to the present invention is a base station that controls transmission power to a mobile terminal in accordance with a command from the mobile terminal,
Means for generating, as base station information used for control of the transmission power, a coefficient relating to a T-SIR (Target-SIR (Signal-to-Interference Ratio)) reduction amount of the power control processing of the mobile terminal calculated from the remaining system capacity And means for notifying all the mobile terminals in the own cell by broadcast the generated base station information.

本発明による携帯端末は、基地局の送信電力を制御するためのコマンドを送信する携帯端末であって、
前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う手段を備えている。 A portable terminal according to the present invention is a portable terminal that transmits a command for controlling transmission power of a base station,
Base station information that uses a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction rate of the power control processing of the terminal calculated from the system remaining capacity in the base station for controlling the transmission power And receiving means for weighting the normal transmission power control using the base station information to control the transmission power according to the situation of the base station.

本発明による基地局電力制御方法は、基地局の送信電力を制御するためのコマンドを送信する携帯端末に用いる基地局電力制御方法であって、
前記携帯端末が、前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う処理を実行している。 A base station power control method according to the present invention is a base station power control method used for a mobile terminal that transmits a command for controlling the transmission power of a base station,
The mobile terminal controls the transmission power using a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction amount of its own power control processing calculated from the system remaining capacity at the base station. When receiving as base station information to be used, the base station information is used to weight the normal transmission power control, and the transmission power control according to the status of the base station is executed.

本発明によるプログラムは、基地局の送信電力を制御するためのコマンドを送信する携帯端末内の中央処理装置に実行させるプログラムであって、
前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う処理を含むことを特徴とする。 A program according to the present invention is a program to be executed by a central processing unit in a mobile terminal that transmits a command for controlling transmission power of a base station,
Base station information that uses a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction rate of the power control processing of the terminal calculated from the system remaining capacity in the base station for controlling the transmission power characterized in that by weighting the control of normal transmission power, including a process for controlling the transmission power according to the situation of the base station using the base station information when received as.

すなわち、本発明の無線システムは、Ｗ−ＣＤＭＡ（Ｗｉｄｅｂａｎｄ−Ｃｏｄｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）方式の無線システムにおける基地局側送信電力制御に関して、基地局側の送信パワー情報（システム残容量等）を携帯端末側に配信可能としている。   That is, the wireless system of the present invention relates to transmission power information (system remaining capacity etc.) on the base station side with respect to base station side transmission power control in a wireless system of W-CDMA (Wideband-Code Division Multiple Access) system. It can be delivered to.

現行のＷ−ＣＤＭＡ方式の無線システム（網）においては、携帯端末（移動局）とのデータ通信が共通チャネル及び個別チャネルにて行われている。多数のユーザが同じチャネルを使える共通チャネル通信とは異なり、携帯端末毎に１つ１つ個別のチャネルが割り与えられている個別チャネル通信は、主に、共通チャネル通信に比べて大容量のデータ通信や所要品質の高い通信［音声通信やＴＶ（テレビ）電話通信］で使用されている。   In the current W-CDMA wireless system (network), data communication with a mobile terminal (mobile station) is performed on a common channel and an individual channel. Unlike common channel communication in which many users can use the same channel, individual channel communication in which individual channels are assigned to each mobile terminal is mainly a large amount of data compared to common channel communication. It is used in communications and communications with high required quality [voice communications and TV (TV) telephone communications].

個別チャネル通信では電力制御も携帯端末毎に行われており、その制御には閉ループ電力制御が使用されている。閉ループ電力制御では、指定されるＱｏＳ（Ｑｕａｌｉｔｙ ｏｆ Ｓｅｒｖｉｃｅ）毎に目標ＢＬＥＲ（Ｂｌｏｃｋ Ｅｒｒｏｒ Ｒａｔｅ）が決まっており、目標ＢＬＥＲに収束するように基地局側電力を制御している。   In individual channel communication, power control is also performed for each mobile terminal, and closed loop power control is used for the control. In the closed loop power control, a target BLER (Block Error Rate) is determined for each designated QoS (Quality of Service), and the base station side power is controlled so as to converge to the target BLER.

具体的には、携帯端末側にてインナループ／アウタループの２つの制御をもっており、アウタループにて目標となるＢＬＥＲと測定したＢＬＥＲとを比較し、Ｔ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）：目標ＳＩＲ］を調整し、インナループにて測定したＳＩＲとＴ−ＳＩＲとを比較し、ＴＰＣ（Ｔｒａｎｓｍｉｔ Ｐｏｗｅｒ Ｃｏｎｔｒｏｌ：基地局電力制御）コマンドを送信する。   Specifically, the mobile terminal side has two controls of the inner loop / outer loop, and the target BLER in the outer loop is compared with the measured BLER, and the T-SIR [Target-SIR (Signal-to-Interference). Ratio): target SIR] is adjusted, the SIR measured in the inner loop is compared with the T-SIR, and a TPC (Transmit Power Control) command is transmitted.

基地局側では携帯端末から送信されたＴＰＣコマンドに従い、その携帯端末への送信電力を制御していく。基本的なＴＰＣコマンドは、測定ＳＩＲがＴ−ＳＩＲよりも高い場合、基地局送信電力を下げる方向で送信され、測定ＳＩＲがＴ−ＳＩＲよりも低い場合、基地局送信電力を上げる方向で送信される。つまり、携帯端末側はＴ−ＳＩＲを制御することで、基地局送信電力を間接的に制御することができる。但し、これは基地局がＴＰＣコマンドに従う場合に限られる。   The base station side controls transmission power to the portable terminal according to the TPC command transmitted from the portable terminal. A basic TPC command is transmitted in a direction to decrease the base station transmission power when the measurement SIR is higher than T-SIR, and is transmitted in a direction to increase the base station transmission power when the measurement SIR is lower than T-SIR. The That is, the mobile terminal side can indirectly control the base station transmission power by controlling the T-SIR. However, this is limited to cases where the base station follows the TPC command.

Ｔ−ＳＩＲの上げ／下げ幅が小さい（緩やかに加工している）場合には、基地局電力も緩やかに増加／減少させるという制御になり、逆にＴ−ＳＩＲの上げ／下げ幅が大きい場合には、基地局電力を急激に増加／減少させるという制御になる。   When the increase / decrease width of T-SIR is small (moving gently), the base station power is controlled to increase / decrease gradually. Conversely, when the increase / decrease width of T-SIR is large In this case, the base station power is suddenly increased / decreased.

Ｔ−ＳＩＲは測定ＢＬＥＲと目標ＢＬＥＲとの比較で調整されるため、エラーフリーの状況下では基本的にＴ−ＳＩＲが低下し、基地局送信電力が小さく抑えられる。   Since the T-SIR is adjusted by comparing the measurement BLER and the target BLER, the T-SIR basically decreases under an error-free situation, and the base station transmission power is kept small.

このように、個別チャネル通信中の電力制御は、各携帯端末で所要品質を満たす範囲内で基地局送信電力をより低くするという、言わば部分最適化がとられている。   In this way, in power control during dedicated channel communication, so-called partial optimization is performed, in which base station transmission power is lowered within a range that satisfies the required quality of each mobile terminal.

本発明では、基地局側から共通チャネルもしくは個別チャネル（この場合には全個別チャネルで同じデータとする）を用いてシステム容量等の電力制御に付加したい基地局に関する情報をブロードキャストし、自セル内の全ての携帯端末に通知する。携帯端末側では受信したシステム容量等の基地局情報を用いて通常の電力制御（主に、Ｔ−ＳＩＲの下げ幅）に重み付けすることによって基地局状況に応じた電力制御を行い、セル内全体で最適化することが可能となる。   In the present invention, information on a base station to be added to power control such as system capacity is broadcast from the base station side using a common channel or individual channels (in this case, all the individual channels have the same data) Notify all mobile devices. The mobile terminal side performs power control according to the base station status by weighting the normal power control (mainly T-SIR reduction width) using the received base station information such as system capacity, and the entire in-cell Can be optimized.

本発明を用いることによって、例えば通信トラフィックが増大する時間帯（出社時や帰宅時）とトラフィックが少ない昼間等の時間毎や都心と地方といった場所による電力制御の使いわけが可能となる。   By using the present invention, it is possible to use power control depending on places such as a time zone when communication traffic increases (when going to the office or returning home), time such as daytime when traffic is low, and places such as the city center and districts.

本発明は、上記のような構成及び動作とすることで、基地局電力制御を基地局の状態に応じて基地局（セル）全体で最適化することができるという効果が得られる。   According to the present invention, the base station power control can be optimized for the entire base station (cell) according to the state of the base station by adopting the configuration and operation as described above.

次に、本発明の実施例について図面を参照して説明する。図１は本発明の一実施例による無線システムの基地局側の構成を示すブロック図である。図１において、基地局１は無線呼制御局２に接続されており、図示せぬ移動局との無線回線の実際の制御を行っている。また、基地局１はアンテナ部１１と、無線部１２と、信号処理部１３と、制御部１４と、情報付加部１５とを備えている。無線呼制御局２は複数の基地局１に接続されており、無線回線の回線接続制御（呼制御）やハンドオーバ制御等を行う装置である。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration on the base station side of a radio system according to an embodiment of the present invention. In FIG. 1, a base station 1 is connected to a radio call control station 2 and performs actual control of a radio channel with a mobile station (not shown). The base station 1 includes an antenna unit 11, a radio unit 12, a signal processing unit 13, a control unit 14, and an information adding unit 15. The radio call control station 2 is connected to a plurality of base stations 1 and is a device that performs line connection control (call control), handover control, and the like of a radio line.

図２は本発明の一実施例による無線システムの構成を示すブロック図であり、図３は本発明の一実施例による基地局情報の周期送信の概念を示す図である。これら図１〜図３を参照して本発明の一実施例による無線システムについて説明する。   FIG. 2 is a block diagram showing a configuration of a radio system according to an embodiment of the present invention, and FIG. 3 is a diagram showing a concept of periodic transmission of base station information according to an embodiment of the present invention. A wireless system according to an embodiment of the present invention will be described with reference to FIGS.

本発明の一実施例による無線システムにおいては、図２に示すように、各基地局１ａ〜１ｃから送信される電波レベルが届く範囲を１つの単位として各サービスエリア（セルａ〜ｃ）が形成されている。尚、各基地局１ａ〜１ｃの構成は上記の基地局１と同様の構成になっている。また、移動局３ａ〜３ｃは移動する移動局３の各サービスエリア（セルａ〜ｃ）各々での位置における端末を示している。   In the radio system according to one embodiment of the present invention, as shown in FIG. 2, each service area (cells a to c) is formed with a range in which radio wave levels transmitted from the base stations 1a to 1c reach as one unit. Has been. The base stations 1a to 1c have the same configuration as that of the base station 1 described above. Further, mobile stations 3a to 3c indicate terminals at positions in the respective service areas (cells a to c) of the moving mobile station 3.

基地局１のアンテナ部１１は、アンテナ及び送信電力増幅部（アンプ）（図示せず）を含むブロックであり、無線部１２に接続されアナログ信号のやりとりを行っている。無線部１２は信号処理部１３からのベースバンド信号をＤ／Ａ（ディジタル／アナログ）変換し、無線信号に変換して送信するとともに、アンテナ部１１から受信した無線信号をＡ／Ｄ（アナログ／ディジタル）変換し、信号処理部１３へ伝送する機能部である。また、無線部１２は制御部１４とも接続されており、無線回線毎の電力制御を実現している。   The antenna unit 11 of the base station 1 is a block including an antenna and a transmission power amplification unit (amplifier) (not shown), and is connected to the radio unit 12 to exchange analog signals. The radio unit 12 performs D / A (digital / analog) conversion on the baseband signal from the signal processing unit 13, converts the baseband signal into a radio signal, transmits the radio signal, and converts the radio signal received from the antenna unit 11 into A / D (analog / analog). This is a functional unit that performs digital) conversion and transmits the signal to the signal processing unit 13. The radio unit 12 is also connected to the control unit 14 to realize power control for each radio line.

信号処理部１３は送信信号の誤り訂正符号化、データ変調、拡散変調、及び受信信号の逆拡散、誤り訂正符号化、誤り訂正復号、データの多重分離等を行う機能部である。送受信データは無線呼制御局２とやりとりされる。   The signal processing unit 13 is a functional unit that performs error correction coding, data modulation, spread modulation, transmission signal despreading, error correction coding, error correction decoding, data demultiplexing, and the like. Transmission / reception data is exchanged with the radio call control station 2.

制御部１４は無線呼制御局２との呼制御信号の送受信を行い、無線回線の管理、無線回線の設定／開放等を行う。情報付加部１５は制御部１４に接続されており、無線呼制御局２からのトラフィック情報や無線部１２から送信電力情報等の関連情報を制御部１４から取得し、基地局情報の生成を行う。生成された基地局情報は制御部１４を経由してブロードキャスト情報として反映される。移動局３ａ〜３ｃへ通知されるデータはＬ１（レイヤ１）情報として送信するため、極力簡単なデータにすることが望ましい。   The control unit 14 transmits / receives call control signals to / from the radio call control station 2, and manages radio lines, sets / releases radio lines, and the like. The information adding unit 15 is connected to the control unit 14, acquires traffic information from the radio call control station 2 and related information such as transmission power information from the radio unit 12 from the control unit 14, and generates base station information. . The generated base station information is reflected as broadcast information via the control unit 14. Since the data notified to the mobile stations 3a to 3c is transmitted as L1 (layer 1) information, it is desirable to make the data as simple as possible.

制御部１４は情報付加部１５から入手したデータを共通チャネルや個別チャネルにて送信する。ここで、共通チャネル及び個別チャネルは物理チャネルを意味しており、共通チャネルにて基地局情報を送信する場合には、既存の共通チャネル［ＣＰＩＣＨ（Ｃｏｍｍｏｎ ＰＩｌｏｔ ＣＨａｎｎｅｌ）／ＰＣＣＰＣＨ（Ｐｒｉｍａｒｙ Ｃｏｍｍｏｎ Ｃｏｎｔｒｏｌ Ｐｈｙｓｉｃａｌ ＣＨａｎｎｅｌ）／ＳＣＣＰＣＨ（Ｓｅｃｏｎｄａｒｙ Ｃｏｍｍｏｎ Ｃｏｎｔｒｏｌ Ｐｈｙｓｉｃａｌ ＣＨａｎｎｅｌ）等］とは別に新規に専用の共通チャネルを使用するか、既存の共通チャネル（ＰＣＣＰＣＨ／ＳＣＣＰＣＨ等のデータ部分）の一部分を周期的に使用する。また、個別チャネルにて送信する場合もＤＰＣＨ（Ｄｅｄｉｃａｔｅｄ Ｐｈｙｓｉｃａｌ ＣＨａｎｎｅｌ）のＤＰＤＣＨ（Ｄｅｄｉｃａｔｅｄ Ｐｈｙｓｉｃａｌ Ｄａｔａ ＣＨａｎｎｅｌ）のデータ部分を周期的に使用する（図３参照）。   The control unit 14 transmits the data obtained from the information adding unit 15 through a common channel or an individual channel. Here, the common channel and the dedicated channel mean physical channels, and when transmitting base station information on the common channel, the existing common channel [CPICH (Common PIOT Channel) / PCCPCH (Primary Common Control Physical Channel) ) / SCCPCH (Secondary Common Control Physical Channel), etc., a new dedicated common channel is used, or a part of an existing common channel (data portion such as PCCPCH / SCCPCH) is periodically used. In addition, when data is transmitted through a dedicated channel, a data portion of a DPDCH (Dedicated Physical Data Channel) of a DPCH (Dedicated Physical Channel) is periodically used (see FIG. 3).

また、各チャネル毎にデータ部分と、その他のＴＰＣ（Ｔｒａｎｓｍｉｔ Ｐｏｗｅｒ Ｃｏｎｔｒｏｌ：基地局電力制御）やＴＦＣＩ（Ｔｒａｎｓｐｏｒｔ Ｆｏｒｍａｔ Ｃｏｍｂｉｎａｔｉｏｎ Ｉｎｄｉｃａｔｏｒ）等のＬ１（レイヤ１）情報とはその配置が異なる。各チャネルのスロット構成については、“Ｐｈｙｓｉｃａｌ ｃｈａｎｎｅｌ ａｎｄ ｍａｐｐｉｎｇ ｏｆ ｔｒａｎｓｐｏｒｔ ｃｈａｎｎｅｌｓ ｏｎｔｏ ｐｈｙｓｉｃａｌ ｃｈａｎｎｅｌｓ”［３ＧＰＰ（３ｒｄ Ｇｅｎｅｒａｔｉｏｎ Ｐａｒｔｎｅｒｓｈｉｐ Ｐｒｏｊｅｃｔ） ＴＳ２５．２１１］（非特許文献１）に記載されている。   Further, the arrangement of the data portion and the L1 (layer 1) information such as other TPC (Transmit Power Control) and TFCI (Transport Format Combination Indicator) is different for each channel. The slot configuration of each channel is described in “Physical channel and mapping of transport channels on physical channel” [3GPP (3rd Generation Partnership Project) TS25.211] (non-patent document 1).

この基地局情報が付加される周期は、接続時に移動局３ａ〜３ｃと整合がとられ、移動局３ａ〜３ｃは決めれた周期でこれらの基地局情報を取得する。図２に示すように、移動局３ａ〜３ｃは各セルａ〜ｃ間を移動することが可能であり、移動先の接続セル毎に上記のブロードキャスト情報を取得する。図２に示すシステムの場合、移動局３ａはセルａの情報、移動局３ｂはセルａとセルｂとの情報、移動局３ｃはセルｃの情報をそれぞれ取得し、そのセルａ〜ｃ毎の電力制御を実施する。   The period in which the base station information is added is matched with the mobile stations 3a to 3c at the time of connection, and the mobile stations 3a to 3c acquire these base station information at a predetermined period. As shown in FIG. 2, the mobile stations 3a to 3c can move between the cells a to c, and acquire the broadcast information for each connected cell to which the mobile station 3a moves. In the case of the system shown in FIG. 2, the mobile station 3a acquires information on the cell a, the mobile station 3b acquires information on the cells a and b, and the mobile station 3c acquires information on the cell c. Implement power control.

図４は図２の移動局３の構成を示すブロック図である。図４において、移動局３はＣＰＵ（中央処理装置）３１と、ＣＰＵ３１が実行する制御プログラム３２ａを格納するメインメモリ３２と、ＣＰＵ３１が制御プログラム３２ａを実行するに用いるデータ等を記憶する記憶装置３３と、無線部３４とから構成されている。   FIG. 4 is a block diagram showing the configuration of the mobile station 3 of FIG. 4, the mobile station 3 includes a CPU (Central Processing Unit) 31, a main memory 32 that stores a control program 32a executed by the CPU 31, and a storage device 33 that stores data used for the CPU 31 to execute the control program 32a. And a radio unit 34.

記憶装置３３はＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）：目標ＳＩＲ］の下げ幅係数を保持するＴ−ＳＩＲ下げ幅係数保持領域３３１を備えている。また、上記の各サービスエリアにおける移動局３ａ〜３ｃはこの移動局３と同様の構成となっている。   The storage device 33 includes a T-SIR reduction width coefficient holding area 331 that holds a reduction width coefficient of T-SIR [Target-SIR (Signal-to-Interference Ratio): target SIR]. In addition, the mobile stations 3 a to 3 c in the service areas have the same configuration as the mobile station 3.

図５は本発明の一実施例によるシステム残容量及び係数の変化の一例を示す図であり、図６は本発明の一実施例による移動局側の動作を示すフローチャートである。これら図１〜図６を参照して本発明の一実施例による無線システムの動作について説明する。尚、図６に示す処理は移動局３のＣＰＵ３１が制御プログラム３２ａを実行することで実現される。   FIG. 5 is a diagram showing an example of changes in the system remaining capacity and coefficients according to one embodiment of the present invention, and FIG. 6 is a flowchart showing the operation on the mobile station side according to one embodiment of the present invention. The operation of the wireless system according to the embodiment of the present invention will be described with reference to FIGS. The process shown in FIG. 6 is realized by the CPU 31 of the mobile station 3 executing the control program 32a.

移動局３，３ａ〜３ｃは通信中に接続先セル（基地局１，１ａ〜１ｃ）にてブロードキャストされている基地局情報を周期的に取得し、自局内の基地局（下り）電力制御処理内｛具体的にはアウタループのＴ−ＳＩＲの下げ幅｝に値を反映する。   The mobile stations 3, 3a to 3c periodically acquire base station information broadcasted in connection destination cells (base stations 1, 1a to 1c) during communication, and base station (downlink) power control processing in the own station The value is reflected in the inner area {specifically, the decrease amount of the T-SIR of the outer loop}.

基地局情報の送信に共通チャネルが使用されていた場合、移動局３，３ａ〜３ｃは個別チャンネル通信中に共通チャネルを同時に取得する必要がある。移動局３，３ａ〜３ｃが共通／個別チャネル同時受信が不可の場合、基地局３，３ａ〜３ｃ側で基地局情報の送信周期毎にコンプレスモードのような個別チャネルでデータを送信しないギャップフレームを作り、それを利用して移動局３，３ａ〜３ｃ側に基地局情報を受信させる。   When a common channel is used for transmission of base station information, the mobile stations 3, 3a to 3c need to acquire the common channel simultaneously during dedicated channel communication. When the mobile stations 3 and 3a to 3c cannot receive the common / dedicated channel simultaneously, the base station 3 and 3a to 3c side does not transmit data on the dedicated channel such as the compressed mode every transmission cycle of the base station information. A frame is created, and base station information is received by the mobile stations 3, 3a to 3c using the frame.

また、個別チャネルでの基地局情報の送信の場合には、通常データを基地局情報に置き換えたタイミングを移動局３，３ａ〜３ｃに通知し、タイミング同期をとる必要がある。   In the case of transmission of base station information on a dedicated channel, it is necessary to notify the mobile stations 3 and 3a to 3c of the timing at which normal data is replaced with base station information and to synchronize timing.

基地局情報は情報付加部１５が無線部１２の状況（現状のシステムの残容量）や無線呼制御局２からの呼接続（トラフィック情報を含む）やメッセージ等の情報を制御部１４から入手し、移動局３，３ａ〜３ｃに通知できるフォーマット（残容量を段階的に通知する等）に加工する。ここではシステム残容量より移動局３，３ａ〜３ｃの電力制御処理のＴ−ＳＩＲ下げ幅にかかる係数を算出して通知するものとする。   As for the base station information, the information adding unit 15 obtains information such as the status of the radio unit 12 (remaining capacity of the current system), the call connection (including traffic information) from the radio call control station 2 and a message from the control unit 14. Then, the data is processed into a format that can be notified to the mobile stations 3 and 3a to 3c (eg, the remaining capacity is notified stepwise). Here, it is assumed that a coefficient relating to the T-SIR reduction width of the power control processing of the mobile stations 3, 3a to 3c is calculated from the system remaining capacity and notified.

図５には、ある基地局１，１ａ〜１ｃ内でのシステム残容量の時間変化とそれによる送信される基地局情報（Ｔ−ＳＩＲ下げ幅の係数）の変化との一例を示す。システム残容量をある閾値毎に区切り、残容量が少ない部分では係数を大きく（１以上）、残容量が多い部分では係数を小さくしている。基地局１，１ａ〜１ｃはこれらの係数を周期的に移動局３，３ａ〜３ｃへブロードキャストする。 FIG. 5 shows an example of a change in the base station information transmitted time of the system remaining capacity in a certain base station 1,1a~1c change and by it (the coefficient of T-SIR decrease width). Separate each threshold in the system remaining capacity, increase the coefficient of the portion remaining capacity is small (1 or more), in a portion remaining capacity often has small coefficients. Base stations 1, 1a to 1c periodically broadcast these coefficients to mobile stations 3, 3a to 3c.

移動局３，３ａ〜３ｃは通信中に（図６ステップＳ１）、基地局情報が送信される周期Ｔにてタイマを起動しており、タイマ満了で（図６ステップＳ２）、基地局情報の取得動作に移行する。基地局情報取得のタイミングは移動局３，３ａ〜３ｃと基地局１，１ａ〜１ｃとで同期がとれている必要がある。   During the communication (step S1 in FIG. 6), the mobile stations 3, 3a to 3c start a timer at the cycle T at which the base station information is transmitted. When the timer expires (step S2 in FIG. 6), Move to acquisition operation. The base station information acquisition timing needs to be synchronized between the mobile stations 3, 3a to 3c and the base stations 1, 1a to 1c.

ここで、移動局３，３ａ〜３ｃは複数の基地局１，１ａ〜１ｃと通信中の場合（図６ステップＳ３）、接続先すべての基地局１，１ａ〜１ｃの基地局情報（Ｔ−ＳＩＲ下げ幅係数）を取得する（図６ステップＳ４）。移動局３，３ａ〜３ｃは複数の基地局１，１ａ〜１ｃと接続がある場合、各基地局１，１ａ〜１ｃのＣＰＩＣＨの受信レベルより各基地局の割合を算出し、係数に割合をかけて合成する（図６ステップＳ５）。例えば、各基地局１，１ａ〜１ｃの割合は（基地局のＣＰＩＣＨレベル）／（全基地局のＣＰＩＣＨレベルの合計）のように算出する。   Here, when the mobile stations 3 and 3a to 3c are communicating with the plurality of base stations 1 and 1a to 1c (step S3 in FIG. 6), the base station information (T− SIR reduction width coefficient) is acquired (step S4 in FIG. 6). When the mobile stations 3, 3a to 3c are connected to a plurality of base stations 1, 1a to 1c, the ratio of each base station is calculated from the CPICH reception level of each of the base stations 1, 1a to 1c, and the ratio is calculated as a coefficient. To synthesize (step S5 in FIG. 6). For example, the ratio of each base station 1, 1 a to 1 c is calculated as (CPICH level of base station) / (total of CPICH levels of all base stations).

また、移動局３，３ａ〜３ｃは複数の基地局１，１ａ〜１ｃと通信中でない場合（図６ステップＳ３）、接続先の基地局１，１ａ〜１ｃの基地局情報（Ｔ−ＳＩＲ下げ幅係数）を取得する（図６ステップＳ７）。   Further, when the mobile stations 3, 3a to 3c are not communicating with the plurality of base stations 1, 1a to 1c (step S3 in FIG. 6), the base station information (T-SIR lowering) of the connected base stations 1, 1a to 1c Width coefficient) is acquired (step S7 in FIG. 6).

移動局３，３ａ〜３ｃは得られたＴ−ＳＩＲ下げ幅係数をアウタループ制御処理に反映し、次にタイマが満了するまで同係数を用いて基地局電力制御を行う（図６ステップＳ６）。尚、本動作は基地局情報をＴ−ＳＩＲ上げ幅係数に変更することによって、エラー発生時等に基地局電力が上がり難くする制御が可能になる。   The mobile stations 3, 3a to 3c reflect the obtained T-SIR reduction width coefficient in the outer loop control process, and then perform base station power control using the coefficient until the timer expires (step S6 in FIG. 6). In this operation, by changing the base station information to the T-SIR increase factor, it is possible to control the base station power to be difficult to increase when an error occurs.

このように、本実施例では、それぞれの基地局１，１ａ〜１ｃからその基地局に関する情報を移動局３，３ａ〜３ｃに通知することによって、各移動局３，３ａ〜３ｃ毎に別々に行なわれていた基地局電力制御を基地局１，１ａ〜１ｃの状態に応じて基地局１ａ〜１ｃ（セルａ〜ｃ）全体で最適化することができる。   In this way, in this embodiment, each mobile station 3, 3a-3c is notified separately by notifying each mobile station 3, 3a-3c of information about the base station from each base station 1, 1a-1c. The base station power control that has been performed can be optimized for the entire base stations 1a to 1c (cells a to c) according to the states of the base stations 1 and 1a to 1c.

また、本実施例では、同一の基地局１，１ａ〜１ｃ内での時間変化［通信トラフィックが増大する時間帯（出社時や帰宅時）、トラフィックが少ない昼間等］、都心と地方といった場所による基地局１，１ａ〜１ｃ毎の電力制御の使いわけが可能となる。   Further, in this embodiment, the time change in the same base station 1, 1a to 1c [time zone when communication traffic increases (when going to work or returning home), daytime when traffic is low, etc.), depending on places such as the city center and the local area. The power control for each of the base stations 1 and 1a to 1c can be properly used.

本発明の一実施例による無線システムの基地局側の構成を示すブロック図である。It is a block diagram which shows the structure by the side of the base station of the radio | wireless system by one Example of this invention. 本発明の一実施例による無線システムの構成を示すブロック図である。It is a block diagram which shows the structure of the radio | wireless system by one Example of this invention. 本発明の一実施例による基地局情報の周期送信の概念を示す図である。It is a figure which shows the concept of the periodic transmission of the base station information by one Example of this invention. 図２の移動局の構成を示すブロック図である。FIG. 3 is a block diagram showing a configuration of the mobile station in FIG. 2. 本発明の一実施例によるシステム残容量及び係数の変化の一例を示す図である。It is a figure which shows an example of the change of the system remaining capacity and a coefficient by one Example of this invention. 本発明の一実施例による移動局側の動作を示すフローチャートである。4 is a flowchart illustrating an operation on the mobile station side according to an embodiment of the present invention.

符号の説明Explanation of symbols

１，１ａ〜１ｃ 基地局
２ 無線呼制御局
３，３ａ〜３ｃ 移動局
１１ アンテナ部
１２ 無線部
１３ 信号処理部
１４ 制御部
１５ 情報付加部
３１ ＣＰＵ
３２ メインメモリ
３２ａ 制御プログラム
３３ 記憶装置
３４ 無線部
３３１ Ｔ−ＳＩＲ下げ幅係数保持領域 1,1a-1c base station
2 Radio call control station 3, 3a-3c Mobile station
11 Antenna section
12 Radio section
13 Signal processor
14 Control unit
15 Information adding part
31 CPU
32 Main memory
32a Control program
33 Storage device
34 Radio section
331 T-SIR reduction width coefficient holding area

Claims (13)

基地局が、携帯端末からのコマンドに従ってその携帯端末への送信電力を制御する無線システムであって、
前記基地局は、システム残容量より算出した前記携帯端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として生成する手段と、その生成した基地局情報をブロードキャストにて自セル内の全ての携帯端末に通知する手段とを有し、
前記携帯端末は、前記基地局情報の受信時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う手段を有することを特徴とする無線システム。 A base station is a wireless system that controls transmission power to a mobile terminal in accordance with a command from the mobile terminal,
The base station uses a coefficient according to a T-SIR (Signal-to-Interference Ratio) reduction rate of the mobile terminal power control processing calculated from the system remaining capacity for controlling the transmission power. Means for generating as information, and means for notifying all the mobile terminals in the own cell by broadcasting the generated base station information,
The mobile terminal has means for controlling transmission power according to the status of the base station by weighting normal transmission power control using the base station information when receiving the base station information. Wireless system. 前記基地局は、前記基地局情報を共通チャネルのデータ部分及び新規共通チャネルのいずれかに周期的に盛り込んで送信することを特徴とする請求項１記載の無線システム。   The wireless system according to claim 1, wherein the base station periodically transmits the base station information in either a data portion of a common channel or a new common channel. 前記基地局は、前記基地局情報を個別チャネルのデータ部分に周期的に盛り込んで送信することを特徴とする請求項１記載の無線システム。   The radio system according to claim 1, wherein the base station periodically transmits the base station information in a data portion of an individual channel. 携帯端末からのコマンドに従ってその携帯端末への送信電力を制御する基地局であって、
システム残容量より算出した前記携帯端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として生成する手段と、その生成した基地局情報をブロードキャストにて自セル内の全ての携帯端末に通知する手段とを有することを特徴とする基地局。 A base station that controls transmission power to a mobile terminal in accordance with a command from the mobile terminal,
Means for generating, as base station information used for control of the transmission power, a coefficient relating to a T-SIR (Target-SIR (Signal-to-Interference Ratio)) reduction amount of the power control processing of the mobile terminal calculated from the remaining system capacity And means for notifying all of the mobile terminals in the own cell by broadcast the generated base station information. 前記基地局情報を共通チャネルのデータ部分及び新規共通チャネルのいずれかに周期的に盛り込んで送信することを特徴とする請求項４記載の基地局。   5. The base station according to claim 4, wherein the base station information is periodically included in one of a data portion of a common channel and a new common channel and transmitted. 前記基地局情報を個別チャネルのデータ部分に周期的に盛り込んで送信することを特徴とする請求項４記載の基地局。   5. The base station according to claim 4, wherein the base station information is periodically included in a data portion of an individual channel and transmitted. 基地局の送信電力を制御するためのコマンドを送信する携帯端末であって、
前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う手段を有することを特徴とする携帯端末。 A mobile terminal that transmits a command for controlling the transmission power of a base station,
Base station information that uses a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction rate of the power control processing of the terminal calculated from the system remaining capacity in the base station for controlling the transmission power mobile terminal, characterized in that it comprises means for controlling the transmission power by weighting the control of the normal transmission power depending on the situation of the base station using the base station information when received as. 個別チャネルのデータ部分に周期的に盛り込まれた前記基地局情報を読出す手段を含むことを特徴とする請求項７記載の携帯端末。   8. The portable terminal according to claim 7, further comprising means for reading the base station information periodically included in the data portion of the dedicated channel. 共通チャネルのデータ部分及び新規共通チャネルのいずれかに周期的に盛り込まれた前記基地局情報を読出す手段を含むことを特徴とする請求項７記載の携帯端末。   8. The portable terminal according to claim 7, further comprising means for reading out the base station information periodically included in any of the data portion of the common channel and the new common channel. 基地局の送信電力を制御するためのコマンドを送信する携帯端末に用いる基地局電力制御方法であって、
前記携帯端末が、前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う処理を実行することを特徴とする基地局電力制御方法。 A base station power control method used for a mobile terminal that transmits a command for controlling the transmission power of a base station,
The mobile terminal controls the transmission power using a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction amount of its own power control processing calculated from the system remaining capacity at the base station. base, characterized in that by weighting the control of the normal transmission power to execute a process for controlling the transmission power according to the situation of the base station using the base station information when it receives a base station information used for Station power control method. 前記携帯端末が、個別チャネルのデータ部分に周期的に盛り込まれた前記基地局情報を読出すことを特徴とする請求項１０記載の基地局電力制御方法。   The base station power control method according to claim 10, wherein the portable terminal reads the base station information periodically included in a data portion of an individual channel. 前記携帯端末が、共通チャネルのデータ部分及び新規共通チャネルのいずれかに周期的に盛り込まれた前記基地局情報を読出すことを特徴とする請求項１０記載の基地局電力制御方法。   The base station power control method according to claim 10, wherein the mobile terminal reads the base station information periodically included in either a data portion of a common channel or a new common channel. 基地局の送信電力を制御するためのコマンドを送信する携帯端末内の中央処理装置に実行させるプログラムであって、
前記基地局にてシステム残容量より算出した自端末の電力制御処理のＴ−ＳＩＲ［Ｔａｒｇｅｔ−ＳＩＲ（Ｓｉｇｎａｌ−ｔｏ−Ｉｎｔｅｒｆｅｒｅｎｃｅ Ｒａｔｉｏ）］下げ幅にかかる係数を前記送信電力の制御に用いる基地局情報として受信した時にその基地局情報を用いて通常の送信電力の制御に重み付けして前記基地局の状況に応じた送信電力の制御を行う処理を含むことを特徴とするプログラム。 A program to be executed by a central processing unit in a mobile terminal that transmits a command for controlling transmission power of a base station,
Base station information that uses a coefficient for a T-SIR (Signal-to-Interference Ratio) reduction rate of the power control processing of the terminal calculated from the system remaining capacity in the base station for controlling the transmission power a program characterized by including the use of base station information by weighting the control of the normal transmission power controls the transmission power according to the situation of the base station processing upon receiving a.
JP2006137146A 2006-05-17 2006-05-17 Wireless system, base station, portable terminal, base station power control method used therefor, and program thereof Expired - Fee Related JP4821431B2 (en)

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CN105940425A (en) * 2014-01-28 2016-09-14 株式会社派契特科宁斯 Power control system and method, and information communication ability control system and method
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