JP5600089B2 - Power control system, radio system management apparatus, and power control method - Google Patents

Power control system, radio system management apparatus, and power control method Download PDF

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JP5600089B2
JP5600089B2 JP2011241363A JP2011241363A JP5600089B2 JP 5600089 B2 JP5600089 B2 JP 5600089B2 JP 2011241363 A JP2011241363 A JP 2011241363A JP 2011241363 A JP2011241363 A JP 2011241363A JP 5600089 B2 JP5600089 B2 JP 5600089B2
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power value
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transmission power
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達也 清水
芳孝 清水
守 小林
修一 吉野
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Nippon Telegraph and Telephone Corp
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本発明は、電力制御システム、無線方式管理装置、及び電力制御方法に関する。   The present invention relates to a power control system, a radio system management apparatus, and a power control method.

周波数利用効率を向上する方法の一つに複数の無線通信システムによる周波数共用があり、モニタ局などを利用して互いに干渉しないように、送信電力を制御する方法などが提案されている（例えば、非特許文献１参照）。   One method of improving frequency utilization efficiency is frequency sharing by a plurality of wireless communication systems, and a method of controlling transmission power so as not to interfere with each other using a monitor station or the like has been proposed (for example, Non-patent document 1).

図２は、従来の周波数共用における送信電力制御の構成を示した図である。複数の無線通信システムによる周波数共用を行う場合、優先度の低い２次利用者は、優先度の高い１次利用者に対して干渉を与えないように送信電力を制御しながら同じ周波数で通信を行う。同図において、１次利用者である基地局９１及び２次利用者である基地局９３の周囲に配置された複数のモニタ局９５−１〜９５−ｎは、基地局９１（１次利用者）の送信信号を受信し、受信電力値を基地局９３（２次利用者）に送信する。このとき、基地局９３の通信エリア内にあるモニタ局９５−１、９５−２、９５−ｎは直接基地局９３（２次利用者）に受信電力値を送信する。一方、基地局９３の通信エリア外のモニタ局９５−３、９５−ｎ−１は、マルチホップ通信を利用し、それぞれモニタ局９５−２、９５−ｎを介して基地局９３に受信電力値を送信する。基地局９３は、最小受信電力のモニタ局９５−ｉ（ｉは１からｎのいずれか）における当該基地局９３からの無線信号の受信レベルが許容干渉レベル以下となるように送信電力を制御して端末局９４（２次利用者）と通信を行う。   FIG. 2 is a diagram illustrating a configuration of conventional transmission power control in frequency sharing. When frequency sharing is performed by a plurality of wireless communication systems, a secondary user with a low priority communicates at the same frequency while controlling transmission power so as not to interfere with a primary user with a high priority. Do. In the figure, a plurality of monitor stations 95-1 to 95-n arranged around a base station 91 that is a primary user and a base station 93 that is a secondary user are the base station 91 (primary user). ) And the received power value is transmitted to the base station 93 (secondary user). At this time, the monitor stations 95-1, 95-2, 95-n in the communication area of the base station 93 directly transmit the received power value to the base station 93 (secondary user). On the other hand, the monitor stations 95-3 and 95-n-1 outside the communication area of the base station 93 use multi-hop communication, and receive power values to the base station 93 via the monitor stations 95-2 and 95-n, respectively. Send. The base station 93 controls the transmission power so that the reception level of the radio signal from the base station 93 in the monitor station 95-i (i is any one of 1 to n) with the minimum reception power is equal to or less than the allowable interference level. To communicate with the terminal station 94 (secondary user).

Y. Yu et al., “Interference information based power control cognitive radio with multi-hop cooperative sensing,” IEICE Trans. Commun., Vol.E91-B, No.1, pp.70-76, Jan. 2008.Y. Yu et al., “Interference information based power control cognitive radio with multi-hop cooperative sensing,” IEICE Trans. Commun., Vol.E91-B, No.1, pp.70-76, Jan. 2008.

しかし、図３に示すように、２つの無線通信システム間の干渉は、基地局と端末局の位置関係によって与干渉局と被干渉局が異なる。同図では、基地局９１（１次利用者）と端末局９２（１次利用者）とが通信し、基地局９３（２次利用者）と端末局９４（２次利用者）とが通信している。図３（ａ）では、基地局９１が与干渉局、基地局９３が被干渉局である。図３（ｂ）では、端末局９２が与干渉局、端末局９４が被干渉局である。図３（ｃ）では、端末局９２が与干渉局、基地局９３が被干渉局である。   However, as shown in FIG. 3, the interference between the two wireless communication systems differs between the interfering station and the interfered station depending on the positional relationship between the base station and the terminal station. In the figure, a base station 91 (primary user) and a terminal station 92 (primary user) communicate with each other, and a base station 93 (secondary user) and a terminal station 94 (secondary user) communicate with each other. doing. In FIG. 3A, the base station 91 is an interfering station, and the base station 93 is an interfered station. In FIG. 3B, the terminal station 92 is an interfering station, and the terminal station 94 is an interfered station. In FIG. 3C, the terminal station 92 is an interfering station, and the base station 93 is an interfered station.

このため、１次利用者および２次利用者の基地局や端末局の位置関係、伝搬損失および周波数共用を行なう時間などを把握して、基地局と端末局のどちらが与干渉源および被干渉源になるのかを特定しないと送信電力制御による干渉回避が困難になる。
また、図２では１次利用者の端末局の受信電力を推定せずに送信電力制御を行うため、許容干渉レベルが最小受信電力を基準に決定されている。よって、１次利用者の受信局の受信電力が最小受信電力よりも大きい場合でも、２次利用者に対して許容される送信電力が過小に設定されてしまい、２次利用者のサービス範囲が狭くなってしまうという問題が生じる。 Therefore, it is possible to grasp the positional relationship between the base station and the terminal station of the primary user and the secondary user, the propagation loss, the time for performing the frequency sharing, and the like. If it is not specified whether interference is to occur, it is difficult to avoid interference by transmission power control.
In FIG. 2, since transmission power control is performed without estimating the reception power of the primary user's terminal station, the allowable interference level is determined based on the minimum reception power. Therefore, even when the reception power of the receiving station of the primary user is larger than the minimum reception power, the transmission power allowed for the secondary user is set too low, and the service range of the secondary user is reduced. The problem of becoming narrow arises.

本発明は、このような事情を考慮してなされたものであり、複数の無線通信システムにおいて周波数を共用する場合に、優先度の高い無線通信システムへの干渉を抑えながら、優先度の低い無線通信システムに属する無線局の通信可能範囲を拡大することができる電力制御システム、無線方式管理装置、及び電力制御方法を提供する。   The present invention has been made in consideration of such circumstances, and in the case where a frequency is shared in a plurality of wireless communication systems, wireless communication with a low priority is suppressed while suppressing interference with a wireless communication system with a high priority. Provided are a power control system, a radio system management apparatus, and a power control method capable of expanding a communicable range of a radio station belonging to a communication system.

上述した課題を解決するために、本発明は、第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムであって、前記無線方式管理装置は、前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信部と、前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出部と、前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御部と、を備える、ことを特徴とする電力制御システムである。 In order to solve the above-described problem, the present invention includes a high-priority wireless communication system including a first wireless station and a second wireless station, and a third wireless station. A power control system having a low-priority wireless communication system and a wireless system management device, wherein the wireless system management device acquires transmission power values of the first wireless station and the second wireless station And a power value receiving unit that receives a transmission power value from the third wireless station, a received power value from the first wireless station, and a received power value from the second wireless station, and the third wireless station. By adding the received power value from the first wireless station in the third wireless station to the difference between the transmitted power value of the wireless station and the transmitted power value of the first wireless station, the third wireless station Calculating a first interference power value from a radio station to the first radio station To, to the difference between the transmission power value of the second radio station and the transmission power value of said third radio station, adding the received power value from the second radio station in the third radio station When the interference amount calculation unit calculates the second interference power value from the third wireless station to the second wireless station, and the first interference power value is larger than the second interference power value The transmission power at the third wireless station is determined from the value obtained by adding the maximum allowable interference amount and the transmission power value at the first wireless station from the first wireless station at the third wireless station. When the second interference power value is controlled to be smaller than a value obtained by subtracting the reception power value, and the second interference power value is larger than the first interference power value, the transmission power in the third radio station is set to the maximum allowable interference. From the sum of the amount and the transmission power value at the second radio station, And a control unit for controlling so as to be smaller than a value obtained by subtracting the received power value from the second radio station in the third radio station, a power control system, characterized in that.

また、本発明は、上述する電力制御システムであって、前記制御部は、前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力値が、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように、前記第１の無線局と同期して無線信号を送信するよう制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力が、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように、前記第２の無線局と同期して無線信号を送信するよう制御する、ことを特徴とする。 Further, the present invention is the above-described power control system, wherein the control unit transmits a transmission power value in the third radio station when the first interference power value is larger than the second interference power value. Is smaller than the value obtained by subtracting the received power value from the second radio station in the third radio station from the value obtained by adding the maximum allowable interference amount and the transmission power value in the second radio station. as described above, the first in synchronism with the radio station to control to transmit a radio signal, when the second interference power value is greater than the first interference power value is transmitted in the third radio station The power is smaller than a value obtained by subtracting the reception power value from the first radio station in the third radio station from the value obtained by adding the maximum allowable interference amount and the transmission power value in the first radio station. made way, no synchronization with the second radio station It controls to transmit a signal, characterized in that.

また、本発明は、上述する電力制御システムであって、前記制御部は、前記第１の無線局と前記第２の無線局の間に設置されたモニタ局の受信電力値に基づいて、前記最大許容干渉量を算出する、ことを特徴とする。   Further, the present invention is the power control system described above, wherein the control unit is based on a received power value of a monitor station installed between the first radio station and the second radio station. The maximum allowable interference amount is calculated.

また、本発明は、第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムの前記無線方式管理装置であって、前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信部と、前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出部と、前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御部と、を備えることを特徴とする無線方式管理装置である。 In addition, the present invention provides a high-priority wireless communication system including a first wireless station and a second wireless station, and a low-priority wireless communication system including a third wireless station. And a radio system management apparatus having a radio system management apparatus for acquiring transmission power values of the first radio station and the second radio station, and the third radio station A transmission power value, a power value receiving unit that receives a reception power value from the first radio station and a reception power value from the second radio station, a transmission power value of the third radio station, and the By adding the received power value from the first wireless station in the third wireless station to the difference from the transmission power value of the first wireless station, the third wireless station transmits the first wireless signal. Calculating a first interference power value to the station and transmitting the third radio station The difference between the transmission power value of the power value and the second radio station, by adding the received power value from the second radio station in the third radio station, said from the third radio station An interference amount calculation unit for calculating a second interference power value for the second radio station; and, if the first interference power value is larger than the second interference power value, transmission in the third radio station The power is smaller than a value obtained by subtracting the received power value from the first radio station in the third radio station from the value obtained by adding the maximum allowable interference amount and the transmission power value in the first radio station. If the second interference power value is greater than the first interference power value, the transmission power at the third radio station is set to the maximum allowable interference amount and the transmission at the second radio station. From the value obtained by adding the power value, the third wireless station A control unit for controlling so as to be smaller than a value obtained by subtracting the received power value from the second radio station is a radio system management apparatus comprising: a.

また、本発明は、第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムが実行する電力制御方法であって、前記無線方式管理装置が、前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信ステップと、前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出ステップと、前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御ステップと、を有することを特徴とする電力制御方法である。
In addition, the present invention provides a high-priority wireless communication system including a first wireless station and a second wireless station, and a low-priority wireless communication system including a third wireless station. And a power control system executed by a power control system having a wireless system management device, wherein the wireless system management device acquires transmission power values of the first wireless station and the second wireless station. A power value receiving step of receiving a transmission power value from the third radio station, a received power value from the first radio station, and a received power value from the second radio station; and the third radio By adding the reception power value from the first radio station in the third radio station to the difference between the transmission power value of the station and the transmission power value of the first radio station, the third radio Calculating a first interference power value from a station to the first radio station Both the difference between the transmission power value of the second radio station and the transmission power value of said third radio station, adding the received power value from the second radio station in the third radio station By the interference amount calculating step for calculating the second interference power value from the third wireless station to the second wireless station, and when the first interference power value is larger than the second interference power value The transmission power at the third wireless station is determined from the value obtained by adding the maximum allowable interference amount and the transmission power value at the first wireless station from the first wireless station at the third wireless station. When the second interference power value is controlled to be smaller than a value obtained by subtracting the reception power value, and the second interference power value is larger than the first interference power value, the transmission power in the third radio station is set to the maximum allowable interference. The amount and the transmission power value in the second radio station From a power control method characterized by and a control step of controlling so as to be smaller than a value obtained by subtracting the received power value from the second radio station in the third radio station.

本発明によれば、複数の無線通信システムにおいて周波数を共用する場合に、優先度の高い無線通信システムへの干渉を抑えながら、優先度の低い無線通信システムに属する無線局の通信可能範囲を拡大することができる。   According to the present invention, when a frequency is shared in a plurality of wireless communication systems, the communication range of wireless stations belonging to a wireless communication system with low priority is expanded while suppressing interference with the wireless communication system with high priority. can do.

本発明の一実施形態による電力制御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 electric power control system by one Embodiment of this invention. 従来の周波数共用における送信電力制御の構成を示す図である。It is a figure which shows the structure of the transmission power control in the conventional frequency sharing. 従来の周波数共用におけるシステム間干渉を示す図である。It is a figure which shows the interference between systems in the conventional frequency sharing.

以下、図面を参照しながら本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明の一実施形態による電力制御システムの構成図である。同図に示す電力制御システムでは、二つの無線通信システムが同一周波数帯を用いて通信しており、一方が１次利用者（高優先度）の無線通信システムであり、他方が２次利用者（低優先度）の無線通信システムである。１次利用者の無線通信システムでは、基地局１（１次利用者）と端末局２（１次利用者）の２つの無線局が通信し、２次利用者の無線通信システムでは、基地局３（２次利用者）と端末局４（２次利用者）の２つの無線局が通信している。１次利用者は周波数利用の優先度が高いため、２次利用者の無線信号が１次利用者の干渉とならないように送信電力を制限する必要がある。   FIG. 1 is a configuration diagram of a power control system according to an embodiment of the present invention. In the power control system shown in the figure, two wireless communication systems communicate using the same frequency band, one is a primary user (high priority) wireless communication system, and the other is a secondary user. It is a (low priority) wireless communication system. In a primary user's radio communication system, two radio stations, a base station 1 (primary user) and a terminal station 2 (primary user) communicate, and in a secondary user's radio communication system, a base station Two wireless stations 3 (secondary user) and terminal station 4 (secondary user) communicate with each other. Since the primary user has a high priority for using the frequency, it is necessary to limit the transmission power so that the radio signal of the secondary user does not interfere with the primary user.

データベース９には、１次利用者の無線通信システムの最大許容干渉量、最小受信電力、干渉マージン、接続方式、送信タイミング、多重方式などの無線諸元が登録されている。さらに、データベース９には、基地局１、端末局２、及びモニタ局５−１〜５−ｎ（以下、総称して「モニタ局５」とも記載する。）の各局の位置情報が登録されている。   In the database 9, radio specifications such as the maximum allowable interference amount, minimum received power, interference margin, connection method, transmission timing, and multiplexing method of the primary user's wireless communication system are registered. Further, in the database 9, position information of each station of the base station 1, the terminal station 2, and the monitor stations 5-1 to 5-n (hereinafter collectively referred to as “monitor station 5”) is registered. Yes.

モニタ局５−１〜５−ｎは、基地局１と端末局２の２ヶ所を結ぶ直線の周辺に設置され、それぞれ、信号処理装置６と光ファイバ１１−１〜１１−ｎにより接続されている。モニタ局５は、基地局１からの受信電力値、ならびに端末局２からの受信電力値を測定し、信号処理装置６を介して無線方式管理装置７に通知する。   The monitor stations 5-1 to 5-n are installed around a straight line connecting the two locations of the base station 1 and the terminal station 2, and are connected by the signal processing device 6 and optical fibers 11-1 to 11-n, respectively. Yes. The monitor station 5 measures the received power value from the base station 1 and the received power value from the terminal station 2 and notifies the radio system management device 7 via the signal processing device 6.

信号処理装置６は、基地局３と光ファイバ１０で接続されており、モニタ局５−１〜５−ｎと光ファイバ１１−１〜１１−ｎにより接続されている。信号処理装置６は、無線方式管理装置７と基地局３やモニタ局５との間のデータを中継する。   The signal processing device 6 is connected to the base station 3 via an optical fiber 10 and is connected to the monitor stations 5-1 to 5-n and optical fibers 11-1 to 11-n. The signal processing device 6 relays data between the radio system management device 7 and the base station 3 or the monitor station 5.

無線方式管理装置７は、インターネットなどを利用したコアネットワーク８を介してデータベース９と接続されている。無線方式管理装置７は電力値受信部７１、干渉量算出部７２、及び制御部７３を備える。電力値受信部７１は、基地局１及び端末局２の送信電力値を受信するとともに、基地局３から送信電力値と、基地局１及び端末局２のそれぞれから受信する無線信号の受信電力値とを受信する。また、電力値受信部７１は、モニタ局５における基地局１からの受信電力値、ならびに端末局２からの受信電力値を受信する。干渉量算出部７２は、電力値受信部７１が受信した送信電力値及び受信電力値に基づいて干渉量を算出する。制御部７３は、干渉量算出部７２が算出した干渉量や、データベース９から読み出した各無線局の位置情報に基づいて、基地局３の送信電力を制御する。   The wireless management device 7 is connected to a database 9 via a core network 8 using the Internet or the like. The radio system management device 7 includes a power value receiving unit 71, an interference amount calculating unit 72, and a control unit 73. The power value receiving unit 71 receives the transmission power values of the base station 1 and the terminal station 2, the transmission power value from the base station 3, and the received power value of the radio signal received from each of the base station 1 and the terminal station 2. And receive. Further, the power value receiving unit 71 receives the received power value from the base station 1 and the received power value from the terminal station 2 in the monitor station 5. The interference amount calculation unit 72 calculates the interference amount based on the transmission power value and the reception power value received by the power value reception unit 71. The control unit 73 controls the transmission power of the base station 3 based on the interference amount calculated by the interference amount calculation unit 72 and the position information of each wireless station read from the database 9.

なお、基地局１、端末局２、及び複数の各モニタ局５の各局は、各局それぞれが内部に備えるＧＰＳ（Global positioning system）などにより位置情報を検出する。各局が検出した位置情報は、データベース９に登録される。例えば、基地局１及び基地局３は、直接、あるいは、他の装置を介してデータベース９に接続され、基地局１は、自局の位置情報及び端末局２から受信した位置情報をデータベース９に登録し、基地局３は、自局の位置情報をデータベース９に登録する。   In addition, each station of the base station 1, the terminal station 2, and each of the plurality of monitor stations 5 detects position information by a GPS (Global positioning system) provided in each station. The position information detected by each station is registered in the database 9. For example, the base station 1 and the base station 3 are connected to the database 9 directly or through another device, and the base station 1 stores the position information of the own station and the position information received from the terminal station 2 in the database 9. The base station 3 registers the position information of the own station in the database 9.

次に、電力制御システムの動作について説明する。
無線方式管理装置７の電力値受信部７１は、データベース９から基地局１と端末局２の送信タイミングを取得し、信号処理装置６を介して基地局３に通知する。 Next, the operation of the power control system will be described.
The power value receiving unit 71 of the wireless system management device 7 acquires the transmission timings of the base station 1 and the terminal station 2 from the database 9 and notifies the base station 3 via the signal processing device 6.

基地局３は、基地局１の送信タイミングにおいて無線信号の電力を測定することにより、自局における基地局１からの送信に対する受信電力Ｐｒｂ２−ｂ１（受信電力値）を測定する。同様に、基地局３は、端末局２の送信タイミングにおいて無線信号の電力を測定することにより、自局における端末局２からの送信に対する受信電力Ｐｒｂ２−ｓ１（受信電力値）を測定する。基地局３は、自局の送信電力Ｐｔｂ２（送信電力値）と、測定した受信電力Ｐｒｂ２−ｂ１、Ｐｒｂ２−ｓ１を信号処理装置６を介してリアルタイムに無線方式管理装置７へ通知する。無線方式管理装置７の電力値受信部７１は、通知された受信電力Ｐｒｂ２−ｂ１、Ｐｒｂ２−ｓ１を受信する。   The base station 3 measures the reception power Prb2-b1 (reception power value) for the transmission from the base station 1 in the own station by measuring the power of the radio signal at the transmission timing of the base station 1. Similarly, the base station 3 measures the reception power Prb2-s1 (reception power value) for the transmission from the terminal station 2 in its own station by measuring the power of the radio signal at the transmission timing of the terminal station 2. The base station 3 notifies the radio system management device 7 of the transmission power Ptb2 (transmission power value) of the own station and the measured reception powers Prb2-b1 and Prb2-s1 via the signal processing device 6 in real time. The power value receiving unit 71 of the wireless system management device 7 receives the received reception powers Prb2-b1 and Prb2-s1.

また、基地局１は自局の送信電力Ｐｔｂ１（送信電力値）を、端末局２は、自局の送信電力Ｐｔｓ１（送信電力値）を、リアルタイムに無線方式管理装置７へ通知する。例えば、基地局１は、信号処理装置６を介してあるいは無線方式管理装置７に直接接続され、基地局１は、自局の送信電力Ｐｔｂ１及び端末局２から受信した送信電力Ｐｔｓ１を無線方式管理装置７に通知する。無線方式管理装置７の電力値受信部７１は、通知された送信電力Ｐｔｂ１及び送信電力Ｐｔｓ１を受信する。   Further, the base station 1 notifies the radio system management device 7 of the transmission power Ptb1 (transmission power value) of the own station and the terminal station 2 in real time of the transmission power Pts1 (transmission power value) of the own station. For example, the base station 1 is directly connected to the radio system management apparatus 7 via the signal processing apparatus 6, and the base station 1 performs radio system management of the transmission power Ptsb 1 of the local station and the transmission power Pts 1 received from the terminal station 2. The device 7 is notified. The power value receiving unit 71 of the wireless system management device 7 receives the notified transmission power Ptb1 and transmission power Pts1.

無線方式管理装置７の干渉量算出部７２は、電力値受信部７１が基地局１の送信タイミングで取得した、基地局３における基地局１からの送信に対する受信電力Ｐｒｂ２−ｂ１、基地局３の送信電力Ｐｔｂ２、及び基地局１の送信電力Ｐｔｂ１を用いて、以下の式（１）により基地局３から基地局１への与干渉量Ｉｂ２−ｂ１を算出する。   The interference amount calculation unit 72 of the wireless system management device 7 includes the received power Prb2-b1 for the transmission from the base station 1 in the base station 3 that the power value reception unit 71 acquires at the transmission timing of the base station 1, and the base station 3 Using the transmission power Ptb2 and the transmission power Ptb1 of the base station 1, the amount of interference Ib2-b1 from the base station 3 to the base station 1 is calculated by the following equation (1).

（Ｉｂ２−ｂ１）＝（Ｐｔｂ２）−（Ｐｔｂ１）＋（Ｐｒｂ２−ｂ１） …（１）   (Ib2-b1) = (Ptb2)-(Ptb1) + (Prb2-b1) (1)

同様に、無線方式管理装置７の干渉量算出部７２は、電力値受信部７１が端末局２の送信タイミングで取得した、基地局３における端末局２からの送信に対する受信電力Ｐｒｂ２−ｓ１、基地局３の送信電力Ｐｔｂ２、及び端末局２の送信電力Ｐｔｓ１を用いて、以下の式（２）により基地局３から端末局２への与干渉量Ｉｂ２−ｓ１を算出する。   Similarly, the interference amount calculation unit 72 of the wireless system management device 7 includes the received power Prb2-s1 for the transmission from the terminal station 2 in the base station 3 that the power value receiving unit 71 acquires at the transmission timing of the terminal station 2, and the base Using the transmission power Ptb2 of the station 3 and the transmission power Pts1 of the terminal station 2, the amount of interference Ib2-s1 from the base station 3 to the terminal station 2 is calculated by the following equation (2).

（Ｉｂ２−ｓ１）＝（Ｐｔｂ２）−（Ｐｔｓ１）＋（Ｐｒｂ２−ｓ１） …（２）   (Ib2-s1) = (Ptb2)-(Pts1) + (Prb2-s1) (2)

[制御方法Ａ：全てに対して干渉を与えない場合]
無線方式管理装置７の制御部７３は、１次利用者の無線通信システムに属する各局への与干渉量を比較し、最も大きな値を選択する。ここでは、端末局２への与干渉量Ｉｂ２−ｓ１が大きいとする。無線方式管理装置７の制御部７３は、１次利用者である無線通信システムの最大許容干渉量Ｉｍａｘ１をデータベース９から読み出すと、以下の式（３）を満たすように、基地局３の送信電力を制御する。 [Control method A: When not giving interference to all]
The control unit 73 of the wireless system management device 7 compares the amount of interference with each station belonging to the primary user's wireless communication system, and selects the largest value. Here, it is assumed that the amount of interference Ib2-s1 to the terminal station 2 is large. When the control unit 73 of the wireless system management device 7 reads the maximum allowable interference amount Imax1 of the wireless communication system that is the primary user from the database 9, the transmission power of the base station 3 satisfies the following expression (3). To control.

（Ｐｔｂ２）＜（Ｉｍａｘ１）＋（Ｐｔｓ１）−（Ｐｒｂ２−ｓ１） …（３）   (Ptb2) <(Imax1) + (Pts1)-(Prb2-s1) (3)

例えば、無線方式管理装置７の制御部７３は、式（３）が満たされていない場合、電力値受信部７１がリアルタイム受信した送信電力Ｐｔｂ２、送信電力Ｐｔｓ１、及び受信電力Ｐｒｂ２−ｓ１が上記の式（３）を満たすまで、基地局３に送信電力を下げるように定期的に指示を出力する。基地局３は、無線方式管理装置７から指示を受ける度に、送信電力を所定電力量だけ低下させ、無線信号を端末局４に送信する。これにより、基地局３は、１次利用者の基地局１ならびに端末局２の両方に干渉を与えることなく無線信号を送信できようになる。   For example, when the formula (3) is not satisfied, the control unit 73 of the wireless system management device 7 determines that the transmission power Ptb2, the transmission power Pts1, and the reception power Prb2-s1 received by the power value reception unit 71 in real time are as described above. Until the expression (3) is satisfied, an instruction is periodically output to the base station 3 so as to reduce the transmission power. Each time the base station 3 receives an instruction from the radio system management device 7, the base station 3 reduces the transmission power by a predetermined power amount and transmits a radio signal to the terminal station 4. As a result, the base station 3 can transmit a radio signal without causing interference to both the base station 1 and the terminal station 2 of the primary user.

なお、基地局１への与干渉量Ｉｂ２−ｂ１が最も大きい場合、無線方式管理装置７は、以下の式（４）を満たすように、基地局３の送信電力を制御する。   When the amount of interference Ib2-b1 to the base station 1 is the largest, the radio system management device 7 controls the transmission power of the base station 3 so as to satisfy the following formula (4).

（Ｐｔｂ２）＜（Ｉｍａｘ１）＋（Ｐｔｂ１）−（Ｐｒｂ２−ｂ１） …（４）   (Ptb2) <(Imax1) + (Ptb1)-(Prb2-b1) (4)

例えば、無線方式管理装置７の制御部７３は、式（４）が満たされていない場合、電力値受信部７１がリアルタイムに受信した送信電力Ｐｔｂ２、送信電力Ｐｔｂ１、及び受信電力Ｐｒｂ２−ｂ１が上記の式（４）を満たすまで、基地局３に送信電力を下げるように定期的に指示を出力する。基地局３は、無線方式管理装置７から指示を受ける度に、送信電力を所定電力量だけ低下させ、無線信号を端末局４に送信する。   For example, when Expression (4) is not satisfied, the control unit 73 of the wireless system management device 7 determines that the transmission power Ptb2, the transmission power Ptb1, and the reception power Prb2-b1 received by the power value reception unit 71 in real time are Until the expression (4) is satisfied, an instruction is periodically output to the base station 3 so as to reduce the transmission power. Each time the base station 3 receives an instruction from the radio system management device 7, the base station 3 reduces the transmission power by a predetermined power amount and transmits a radio signal to the terminal station 4.

[制御方法Ｂ：送信タイミングを選択する場合]
無線方式管理装置７の制御部７３は、制御方法Ａと同様に、１次利用者の無線通信システムに属する各無線局への与干渉量を比較し、最も大きな値を選択する。ここでは、端末局２への与干渉量Ｉｂ２−ｓ１が大きいとする。
このとき、端末局２における無線信号の送信に同期して、基地局３が無線信号を送信すれば、端末局２には干渉を与えない。そこで、まず、無線方式管理装置７の制御部７３は、１次利用者である無線通信システムの最大許容干渉量Ｉｍａｘ１をデータベース９から読み出す。そして、制御部７３は、以下の式（５）を満たすように、端末局２における無線信号の送信に同期して基地局３が無線信号を送信する際の送信電力を制御する。 [Control method B: When selecting transmission timing]
Similarly to the control method A, the control unit 73 of the wireless system management device 7 compares the amount of interference with each wireless station belonging to the primary user's wireless communication system, and selects the largest value. Here, it is assumed that the amount of interference Ib2-s1 to the terminal station 2 is large.
At this time, if the base station 3 transmits a radio signal in synchronization with the transmission of the radio signal in the terminal station 2, no interference is given to the terminal station 2. Therefore, first, the control unit 73 of the wireless system management device 7 reads the maximum allowable interference amount Imax1 of the wireless communication system that is the primary user from the database 9. And the control part 73 controls the transmission power at the time of the base station 3 transmitting a radio signal synchronizing with transmission of the radio signal in the terminal station 2 so that the following formula | equation (5) may be satisfy | filled.

（Ｐｔｂ２）＜（Ｉｍａｘ１）＋（Ｐｔｂ１）−（Ｐｒｂ２−ｂ１） …（５）   (Ptb2) <(Imax1) + (Ptb1)-(Prb2-b1) (5)

例えば、無線方式管理装置７の制御部７３は、式（５）が満たされていない場合、電力値受信部７１が受信した送信電力Ｐｔｂ２、送信電力Ｐｔｂ１、及び受信電力Ｐｒｂ２−ｂ１が上記の式（５）を満たすまで、基地局３に送信電力を下げるように指示する。基地局３は、無線方式管理装置７から指示を受ける度に、送信電力を所定電力量だけ低下させ、端末局２における無線信号の送信に同期して無線信号を端末局４に送信する。   For example, when Expression (5) is not satisfied, the control unit 73 of the wireless system management device 7 determines that the transmission power Ptb2, the transmission power Ptb1, and the reception power Prb2-b1 received by the power value reception unit 71 are the above expressions. The base station 3 is instructed to lower the transmission power until (5) is satisfied. Each time the base station 3 receives an instruction from the radio system management device 7, the base station 3 reduces the transmission power by a predetermined power amount and transmits the radio signal to the terminal station 4 in synchronization with the transmission of the radio signal in the terminal station 2.

これにより制御方法Ａと比較して、基地局３は、（Ｐｔｂ１）−（Ｐｔｓ１）＋（Ｐｒｂ２−ｓ１）−（Ｐｒｂ２−ｂ１）だけ大きな送信電力で通信できる。   Thereby, compared with the control method A, the base station 3 can communicate with larger transmission power by (Ptb1) − (Pts1) + (Prb2−s1) − (Prb2−b1).

なお、基地局１への与干渉量Ｉｂ２−ｓ１が最も大きい場合、無線方式管理装置７の制御部７３は、以下の式（６）を満たすように、基地局１における無線信号の送信に同期して基地局３が無線信号を送信する際の送信電力を制御する。   When the amount of interference Ib2-s1 to the base station 1 is the largest, the control unit 73 of the radio system management device 7 is synchronized with the radio signal transmission in the base station 1 so as to satisfy the following formula (6). Then, the transmission power when the base station 3 transmits a radio signal is controlled.

（Ｐｔｂ２）＜（Ｉｍａｘ１）＋（Ｐｔｓ１）−（Ｐｒｂ２−ｓ１） …（６）   (Ptb2) <(Imax1) + (Pts1)-(Prb2-s1) (6)

例えば、無線方式管理装置７の制御部７３は、式（６）が満たされていない場合、電力値受信部７１が受信した送信電力Ｐｔｂ２、送信電力Ｐｔｓ１、及び受信電力Ｐｒｂ２−ｓ１が上記の式（６）を満たすまで、基地局３に送信電力を下げるように指示する。基地局３は、無線方式管理装置７から指示を受ける度に、送信電力を所定電力量だけ低下させ、基地局１における無線信号の送信に同期して無線信号を端末局４に送信する。   For example, when Expression (6) is not satisfied, the control unit 73 of the wireless system management device 7 determines that the transmission power Ptb2, the transmission power Pts1, and the reception power Prb2-s1 received by the power value reception unit 71 are the above expressions. The base station 3 is instructed to lower the transmission power until (6) is satisfied. Each time the base station 3 receives an instruction from the radio system management device 7, the base station 3 reduces the transmission power by a predetermined power amount and transmits the radio signal to the terminal station 4 in synchronization with the transmission of the radio signal in the base station 1.

[制御方法Ｃ：モニタ局を利用して最大許容干渉量を求める]
制御方法Ａおよび制御方法Ｂで用いた最大許容干渉量Ｉｍａｘ１は、通常の場合、最小受信電力、干渉マージンおよび雑音マージンから算出された固定値であり、一般的に１次利用者の基地局１のサービスエリアの端における受信電力を想定して定められる。換言すると、最小受信電力での受信は、サービスエリア端に位置する場合や、遮蔽物により伝搬損失が増加する場合などに限られ、それ以外での受信電力は最小受信電力よりも大きくなると考えられる。また、受信電力の増加に伴い、最大許容干渉量も増加する。したがって、１次利用者の基地局１と端末局２との位置関係に応じて最小受信電力を定めることにより、２次利用者の基地局３の送信電力を高くすることができる。 [Control method C: Use monitor station to determine maximum allowable interference amount]
The maximum allowable interference amount Imax1 used in the control method A and the control method B is a fixed value calculated from the minimum reception power, the interference margin, and the noise margin in the normal case, and is generally a base station 1 of the primary user. It is determined assuming reception power at the end of the service area. In other words, reception at the minimum reception power is limited to cases where it is located at the end of the service area or when propagation loss increases due to shielding, and other reception power is considered to be larger than the minimum reception power. . Further, the maximum allowable interference amount increases as the received power increases. Therefore, by determining the minimum reception power according to the positional relationship between the primary user's base station 1 and the terminal station 2, the transmission power of the secondary user's base station 3 can be increased.

そこで、基地局１と端末局２の２ヶ所を結ぶ直線周辺に位置するモニタ局５は、基地局１ならびに端末局２の送信に同期して受信電力を測定し、信号処理装置６を介して無線方式管理装置７に通知する。
なお、モニタ局５は、基地局１と端末局２との間で送受信される無線信号を受信し、受信した無線信号の受信状態を示す無線データを信号処理装置６に通知し、信号処理装置６が、受信した無線データから受信電力を取得して無線方式管理装置７に通知してもよい。 Therefore, the monitor station 5 located around the straight line connecting the two locations of the base station 1 and the terminal station 2 measures the received power in synchronization with the transmission of the base station 1 and the terminal station 2 and passes through the signal processing device 6. The wireless system management device 7 is notified.
The monitor station 5 receives a radio signal transmitted / received between the base station 1 and the terminal station 2 and notifies the signal processing device 6 of radio data indicating the reception state of the received radio signal. 6 may acquire the received power from the received wireless data and notify the wireless management device 7 of the received power.

無線方式管理装置７の制御部７３は、データベース９から基地局１、端末局２および各モニタ局５の位置情報を取得する。
制御部７３は、基地局１からの各モニタ局５の距離と、基地局１の送信タイミングにおいて得られたこれらモニタ局５における電力量との関係に基づいて、アンテナ高による補正などを含めた伝搬損失の回帰式を求める。制御部７３は、この求めた回帰式と、基地局１と端末局２との距離とから、端末局２における基地局１からの受信電力を推定する。 The control unit 73 of the wireless system management device 7 acquires the position information of the base station 1, the terminal station 2, and each monitor station 5 from the database 9.
The control unit 73 includes correction based on the antenna height based on the relationship between the distance of each monitor station 5 from the base station 1 and the amount of power in the monitor station 5 obtained at the transmission timing of the base station 1. Find the regression equation for propagation loss. The control unit 73 estimates the received power from the base station 1 in the terminal station 2 from the obtained regression equation and the distance between the base station 1 and the terminal station 2.

同様に、制御部７３は、端末局２からの各モニタ局５の距離と、端末局２の送信タイミングにおいて得られたこれらモニタ局５における電力量との関係に基づいて、アンテナ高による補正などを含めた伝搬損失の回帰式を求める。制御部７３は、この求めた回帰式と、基地局１と端末局２との距離とから、基地局１における端末局２からの受信電力を推定する。   Similarly, the control unit 73 corrects the antenna height based on the relationship between the distance of each monitor station 5 from the terminal station 2 and the amount of power in the monitor station 5 obtained at the transmission timing of the terminal station 2. The regression equation of the propagation loss including is obtained. The control unit 73 estimates the received power from the terminal station 2 in the base station 1 from the obtained regression equation and the distance between the base station 1 and the terminal station 2.

次に、制御部７３は、基地局１、端末局２のそれぞれについて推定した受信電力からそれぞれの最大許容干渉量Ｉｍａｘ１ｂ、Ｉｍａｘ１ｓを推定する。例えば、基地局１について推定した受信電力と、基地局１から取得した雑音電力との比からＳＩＲを求め、求めたＳＩＲと、基地局１が使用する伝送方式（変調方式等）を想定したときに必要となる所要ＳＩＲとの差から最大許容干渉量Ｉｍａｘ１ｂを推定する。同様に、端末局２について推定した受信電力と、端末局２から取得した雑音電力との比からＳＩＲを求め、求めたＳＩＲと、端末局２が使用する伝送方式（変調方式等）を想定したときに必要となる所要ＳＩＲとの差から最大許容干渉量Ｉｍａｘ１ｓを推定する。   Next, the control unit 73 estimates the maximum allowable interference amounts Imax1b and Imax1s from the received power estimated for the base station 1 and the terminal station 2, respectively. For example, when the SIR is obtained from the ratio between the received power estimated for the base station 1 and the noise power obtained from the base station 1, and the obtained SIR and the transmission method (modulation method, etc.) used by the base station 1 are assumed The maximum allowable interference amount Imax1b is estimated from the difference from the required SIR required for the above. Similarly, the SIR is obtained from the ratio between the received power estimated for the terminal station 2 and the noise power obtained from the terminal station 2, and the obtained SIR and the transmission method (modulation method, etc.) used by the terminal station 2 are assumed. The maximum allowable interference amount Imax1s is estimated from the difference from the required SIR that is sometimes required.

無線方式管理装置７の制御部７３は、推定した最大許容干渉量を用いて、端末局２へ干渉を与えない基地局３の最大送信電力Ｐｔｂ２−ｓ１を、以下の式（７）により算出する。   The control unit 73 of the radio system management device 7 uses the estimated maximum allowable interference amount to calculate the maximum transmission power Ptb2-s1 of the base station 3 that does not interfere with the terminal station 2 using the following equation (7). .

（Ｐｔｂ２−ｓ１）＝（Ｉｍａｘ１ｓ）−（Ｐｒｂ２−ｓ１） …（７）   (Ptb2-s1) = (Imax1s)-(Prb2-s1) (7)

また、無線方式管理装置７の制御部７３は、推定した最大許容干渉量を用いて、基地局１へ干渉を与えない基地局３の最大送信電力Ｐｔｂ２−ｂ１を、以下の式（８）により算出する。   Further, the control unit 73 of the wireless system management device 7 uses the estimated maximum allowable interference amount to calculate the maximum transmission power Ptb2-b1 of the base station 3 that does not interfere with the base station 1 according to the following equation (8). calculate.

（Ｐｔｂ２−ｂ１）＝（Ｉｍａｘ１ｂ）−（Ｐｒｂ２−ｂ１） …（８）   (Ptb2-b1) = (Imax1b) − (Prb2-b1) (8)

無線方式管理装置７の制御部７３は、算出した最大送信電力Ｐｔｂ２−ｓ１及び最大送信電力Ｐｔｂ２−ｂ１を基地局３に通知する。   The control unit 73 of the wireless system management device 7 notifies the base station 3 of the calculated maximum transmission power Ptb2-s1 and maximum transmission power Ptb2-b1.

基地局３は、最大送信電力Ｐｔｂ２−ｓ１及び最大送信電力Ｐｔｂ２−ｂ１のいずれか小さいほうに送信電力を設定して送信する。この場合、端末局２ならびに基地局１のどちらにも与干渉とならない。   The base station 3 sets the transmission power to the smaller one of the maximum transmission power Ptb2-s1 and the maximum transmission power Ptb2-b1, and transmits. In this case, there is no interference to either the terminal station 2 or the base station 1.

また、基地局３は、最大送信電力Ｐｔｂ２−ｓ１のほうが最大送信電力Ｐｔｂ２−ｂ１よりも小さい場合、端末局２の送信タイミングに同期して無線信号を送信することにより、最大送信電力Ｐｔｂ２−ｂ１に送信電力を設定することができる。
同様に、基地局３は、最大送信電力Ｐｔｂ２−ｂ１のほうが最大送信電力Ｐｔｂ２−ｓ１よりも小さい場合、基地局１の送信タイミングに同期して無線信号を送信することにより、最大送信電力Ｐｔｂ２−ｓ１に送信電力を設定することができる。 In addition, when the maximum transmission power Ptb2-s1 is smaller than the maximum transmission power Ptb2-b1, the base station 3 transmits a radio signal in synchronization with the transmission timing of the terminal station 2, thereby causing the maximum transmission power Ptb2-b1. The transmission power can be set.
Similarly, when the maximum transmission power Ptb2-b1 is smaller than the maximum transmission power Ptb2-s1, the base station 3 transmits a radio signal in synchronism with the transmission timing of the base station 1, whereby the maximum transmission power Ptb2- Transmission power can be set to s1.

なお、上記実施形態では、基地局１、端末局２から送信電力を受信しているが、基地局１、端末局２の送信電力が一定である場合には、データベース９に予め送信電力Ｐｔｂ１、送信電力Ｐｔｓ１を記憶しておき、無線方式管理装置７の電力値受信部７１は、データベース９からこれらの値を読み出してもよい。   In the above embodiment, the transmission power is received from the base station 1 and the terminal station 2, but when the transmission power of the base station 1 and the terminal station 2 is constant, the transmission power Ptb1, The transmission power Pts1 may be stored, and the power value receiving unit 71 of the wireless system management device 7 may read these values from the database 9.

また、モニタ局５は、受信機能のみを持つ無線機器に限定するものではなく、無線ＬＡＮ（Local Area Network）のアクセスポイントなどの無線基地局でも良い。この無線基地局は、無線方式管理装置７に光ファイバ１１ならびに信号処理装置６を介して、あるいは、コアネットワーク８を介して接続され、通信時間以外の待機時間においてのみ、上述したモニタ局５として動作する。   The monitor station 5 is not limited to a wireless device having only a reception function, and may be a wireless base station such as a wireless LAN (Local Area Network) access point. This radio base station is connected to the radio system management device 7 via the optical fiber 11 and the signal processing device 6 or via the core network 8 and is used as the monitor station 5 described above only in the standby time other than the communication time. Operate.

また、上記においては、基地局３の送信電力を制御する場合について説明したが、同様にして端末局４の送信電力を制御することもできる。但し、端末局４は、無線局３を介して無線方式管理装置７と通信する。   In the above description, the transmission power of the base station 3 is controlled. However, the transmission power of the terminal station 4 can be controlled in the same manner. However, the terminal station 4 communicates with the wireless system management device 7 via the wireless station 3.

コグニティブ無線のように従来の方法によって無線通信システム間で周波数を共用する場合には、モニタ局を設置し、複数の無線通信システム間で干渉が生じないように送信電力制御を行っていた。しかし、この方法では、それぞれのシステムにおける基地局と端末局の間の位置関係によって、干渉局と被干渉局が一定でないため、精度よく送信電力制御ができないという問題があった。また、１次利用者の端末局の受信電力を推定せずに行う方法では、許容干渉レベルが最小受信電力を基準に設定されるため、２次利用者の送信電力が過剰に低くなるという問題があった。   When a frequency is shared between wireless communication systems by a conventional method like cognitive radio, a monitor station is installed and transmission power control is performed so that interference does not occur between a plurality of wireless communication systems. However, this method has a problem that transmission power control cannot be performed accurately because the interfering station and the interfered station are not constant depending on the positional relationship between the base station and the terminal station in each system. Further, in the method performed without estimating the reception power of the primary user's terminal station, since the allowable interference level is set based on the minimum reception power, the transmission power of the secondary user becomes excessively low. was there.

そこで本実施形態では、２次利用者の基地局における１次利用者の各局の受信電力に基づいて与干渉電力を推定し、２次利用者の基地局の送信電力を制御する。具体的には、２次利用者の基地局は、１次利用者の基地局および端末局の送信タイミングをデータベースから取得し、そのときの受信電力に基づいてそれぞれの無線局からの受信電力を取得する。無線方式管理装置は、それぞれの無線局と２次利用者の基地局の送信電力の差に、２次利用者の基地局が取得した受信電力を加算することによって与干渉電力を算出する。この与干渉電力が、予め決められた最大許容干渉レベル、１次利用者の無線局の送信電力、及び２次利用者の基地局における１次利用者の無線局からの受信電力に基づいて得られる許容される干渉レベルを超えている場合、無線方式管理装置は、２次利用者の基地局の送信電力を低下させる。   Therefore, in this embodiment, the interference power is estimated based on the received power of each station of the primary user in the base station of the secondary user, and the transmission power of the base station of the secondary user is controlled. Specifically, the secondary user's base station acquires the transmission timing of the primary user's base station and terminal station from the database, and based on the received power at that time, the received power from each radio station is obtained. get. The wireless system management device calculates the interference power by adding the received power acquired by the secondary user's base station to the difference in transmission power between the respective wireless stations and the secondary user's base station. The interference power is obtained based on a predetermined maximum allowable interference level, transmission power of the primary user's radio station, and reception power from the primary user's radio station in the secondary user's base station. When the allowable interference level is exceeded, the radio system management device reduces the transmission power of the secondary user's base station.

このような構成にすることで、２次利用者の基地局は、１次利用者の基地局および端末局のいずれの無線局に対しても最大許容干渉レベルを超えないように送信を行いながら、１次利用者の無線通信システムと同一の周波数を使用することが可能となる。このとき、実際に１次利用者の無線局に与えている干渉電力に従って、２次利用者の基地局に対して許容される干渉レベルを決定するため、２次利用者の基地局が無線通信できる範囲（サービスエリア）を従来よりも拡大することができる。   With this configuration, the base station of the secondary user transmits to the radio station of the primary user base station and the terminal station so that the maximum allowable interference level is not exceeded. It becomes possible to use the same frequency as that of the primary user's wireless communication system. At this time, since the interference level allowed for the secondary user's base station is determined according to the interference power actually given to the primary user's radio station, the secondary user's base station performs wireless communication. The possible range (service area) can be expanded more than before.

なお、２次利用者の基地局は、１次利用者の無線局のうち、被干渉電力の大きい無線局の送信タイミングと同期して、他方の無線局の最大許容干渉レベルより低くなるような送信電力で送信を行うことも可能である。この場合には、送信電力を高くすることができるため、２次利用者のサービスエリアがさらに拡大する効果がある。   Note that the secondary user base station is lower than the maximum allowable interference level of the other radio station in synchronism with the transmission timing of the radio station having the high interference power among the primary user radio stations. It is also possible to perform transmission with transmission power. In this case, since the transmission power can be increased, the service area of the secondary user can be further expanded.

また、最大許容干渉レベルを、１次利用者の無線局の近くにおいたモニタ局が受信する当該１次利用者の無線局からの受信電力に基づいて算出することもできる。この場合は、１次利用者の最大許容干渉レベルとして最小となる固定値を用いずに、１次利用者の基地局と端末局の位置関係に基づいた最適な値を用いることができるため、２次利用者の送信電力を高くすることができる。   Also, the maximum allowable interference level can be calculated based on the received power from the primary user's radio station received by the monitor station located near the primary user's radio station. In this case, since an optimal value based on the positional relationship between the base station and the terminal station of the primary user can be used without using the fixed value that is the minimum as the maximum allowable interference level of the primary user, The transmission power of the secondary user can be increased.

以上、本発明の実施の形態について説明したが、無線方式管理装置７の電力値受信部７１、干渉量算出部７２、制御部７３は、専用のハードウェア（例えば、ワイヤードロジック等）により実現されてもよく、電力値受信部７１、干渉量算出部７２、制御部７３がメモリおよびＣＰＵ（中央処理装置）により構成され、各部の機能を実現するためのプログラムをメモリからロードして実行することによりその機能を実現させるものであってもよい。   Although the embodiment of the present invention has been described above, the power value reception unit 71, the interference amount calculation unit 72, and the control unit 73 of the wireless system management device 7 are realized by dedicated hardware (for example, wired logic). The power value receiving unit 71, the interference amount calculating unit 72, and the control unit 73 are configured by a memory and a CPU (central processing unit), and a program for realizing the function of each unit is loaded from the memory and executed. The function may be realized by.

また、上記プログラムは、このプログラムを記憶装置等に格納したコンピュータシステムから、伝送媒体を介して、あるいは、伝送媒体中の伝送波により他のコンピュータシステムに伝送されてもよい。ここで、プログラムを伝送する「伝送媒体」は、インターネット等のネットワーク（通信網）や電話回線等の通信回線（通信線）のように情報を伝送する機能を有する媒体のことをいう。また、上記プログラムは、前述した機能の一部を実現するためのものであっても良い。さらに、前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるもの、いわゆる差分ファイル（差分プログラム）であっても良い。   The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

１ 基地局（第１の無線局）
２ 端末局（第２の無線局）
３ 基地局（第３の無線局）
４ 端末局（第３の無線局）
５−１〜５−ｎ モニタ局
６ 信号処理装置
７ 無線方式管理装置
８ コアネットワーク
９ データベース
１０、１１−１〜１１−ｎ 光ファイバ
７１ 電力値受信部
７２ 干渉量算出部
７３ 制御部
９１、９３ 基地局
９２、９４ 端末局
９５−１〜９５−ｎ モニタ局 1 Base station (first radio station)
2 Terminal station (second radio station)
3 Base station (third radio station)
4 Terminal station (third radio station)
5-1 to 5-n Monitor station 6 Signal processing device 7 Wireless system management device 8 Core network 9 Database 10, 11-1 to 11-n Optical fiber 71 Power value receiving unit 72 Interference amount calculating unit 73 Control unit 91, 93 Base station 92, 94 Terminal station 95-1 to 95-n Monitor station

Claims (5)

第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムであって、
前記無線方式管理装置は、
前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信部と、
前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出部と、
前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御部と、
を備える、
ことを特徴とする電力制御システム。 A high-priority wireless communication system including a first wireless station and a second wireless station, a low-priority wireless communication system including a third wireless station, and a wireless system management device A power control system comprising:
The wireless method management device
The transmission power values of the first wireless station and the second wireless station are acquired, the transmission power value from the third wireless station, the reception power value from the first wireless station, and the second wireless station A power value receiving unit for receiving a received power value from a wireless station;
By adding the reception power value from the first radio station in the third radio station to the difference between the transmission power value of the third radio station and the transmission power value of the first radio station, The first interference power value from the third radio station to the first radio station is calculated, and the difference between the transmission power value of the third radio station and the transmission power value of the second radio station a, by adding the received power value from the second radio station in the third radio station, to calculate a second interference power value to the second radio station from the third wireless station An interference amount calculation unit;
When the first interference power value is larger than the second interference power value, the transmission power at the third radio station is added to the maximum allowable interference amount and the transmission power value at the first radio station. The value is controlled to be smaller than a value obtained by subtracting the received power value from the first wireless station in the third wireless station, and the second interference power value is greater than the first interference power value. In the case of being large, the second radio station in the third radio station is determined from the value obtained by adding the maximum allowable interference amount and the transmission power value in the second radio station to the transmission power in the third radio station. A control unit that controls to be smaller than a value obtained by subtracting the received power value from
Comprising
A power control system characterized by that. 前記制御部は、前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力値が、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように、前記第１の無線局と同期して無線信号を送信するよう制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力が、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように、前記第２の無線局と同期して無線信号を送信するよう制御する、
ことを特徴とする請求項１に記載の電力制御システム。 When the first interference power value is larger than the second interference power value, the control unit determines that the transmission power value in the third radio station is the maximum allowable interference amount and the transmission in the second radio station. from the value obtained by adding the power value, the third way is smaller than the value obtained by subtracting the received power value from the second radio station in a radio station, a radio signal in synchronization with the first radio station When the second interference power value is larger than the first interference power value, the transmission power in the third radio station is determined by the maximum allowable interference amount and the first radio station. The radio is synchronized with the second radio station so as to be smaller than the value obtained by subtracting the reception power value from the first radio station in the third radio station from the value obtained by adding the transmission power value. Control to send signals,
The power control system according to claim 1. 前記制御部は、前記第１の無線局と前記第２の無線局の間に設置されたモニタ局の受信電力値に基づいて、前記最大許容干渉量を算出する、
ことを特徴とする請求項１または請求項２に記載の電力制御システム。 The control unit calculates the maximum allowable interference amount based on a received power value of a monitor station installed between the first radio station and the second radio station;
The power control system according to claim 1 or 2, characterized by the above. 第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムの前記無線方式管理装置であって、
前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信部と、
前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出部と、
前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御部と、
を備えることを特徴とする無線方式管理装置。 A high-priority wireless communication system including a first wireless station and a second wireless station, a low-priority wireless communication system including a third wireless station, and a wireless system management device The wireless method management device of the power control system comprising:
The transmission power values of the first wireless station and the second wireless station are acquired, the transmission power value from the third wireless station, the reception power value from the first wireless station, and the second wireless station A power value receiving unit for receiving a received power value from a wireless station;
By adding the reception power value from the first radio station in the third radio station to the difference between the transmission power value of the third radio station and the transmission power value of the first radio station, The first interference power value from the third radio station to the first radio station is calculated, and the difference between the transmission power value of the third radio station and the transmission power value of the second radio station a, by adding the received power value from the second radio station in the third radio station, to calculate a second interference power value to the second radio station from the third wireless station An interference amount calculation unit;
When the first interference power value is larger than the second interference power value, the transmission power at the third radio station is added to the maximum allowable interference amount and the transmission power value at the first radio station. The value is controlled to be smaller than a value obtained by subtracting the received power value from the first wireless station in the third wireless station, and the second interference power value is greater than the first interference power value. In the case of being large, the second radio station in the third radio station is determined from the value obtained by adding the maximum allowable interference amount and the transmission power value in the second radio station to the transmission power in the third radio station. A control unit that controls to be smaller than a value obtained by subtracting the received power value from
A wireless system management device comprising: 第１の無線局および第２の無線局を含んで構成される高優先度の無線通信システムと、第３の無線局を含んで構成される低優先度の無線通信システムと、無線方式管理装置とを有する電力制御システムが実行する電力制御方法であって、
前記無線方式管理装置が、
前記第１の無線局及び前記第２の無線局の送信電力値を取得するとともに、前記第３の無線局から送信電力値と、前記第１の無線局からの受信電力値及び前記第２の無線局からの受信電力値を受信する電力値受信ステップと、
前記第３の無線局の送信電力値と前記第１の無線局の送信電力値との差に、前記第３の無線局における前記第１の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第１の無線局への第１の干渉電力値を算出するとともに、前記第３の無線局の送信電力値と前記第２の無線局の送信電力値との差に、前記第３の無線局における前記第２の無線局からの受信電力値を加算することにより、当該第３の無線局から前記第２の無線局への第２の干渉電力値を算出する干渉量算出ステップと、
前記第１の干渉電力値が前記第２の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第１の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第１の無線局からの受信電力値を減算した値よりも小さくなるように制御し、前記第２の干渉電力値が前記第１の干渉電力値より大きい場合は、前記第３の無線局における送信電力を、最大許容干渉量と前記第２の無線局における送信電力値とを加算した値から、前記第３の無線局における前記第２の無線局からの受信電力値を減算した値よりも小さくなるように制御する制御ステップと、
を有することを特徴とする電力制御方法。 A high-priority wireless communication system including a first wireless station and a second wireless station, a low-priority wireless communication system including a third wireless station, and a wireless system management device A power control method executed by a power control system comprising:
The wireless method management device is
The transmission power values of the first wireless station and the second wireless station are acquired, the transmission power value from the third wireless station, the reception power value from the first wireless station, and the second wireless station A power value receiving step for receiving a received power value from a radio station;
By adding the reception power value from the first radio station in the third radio station to the difference between the transmission power value of the third radio station and the transmission power value of the first radio station, The first interference power value from the third radio station to the first radio station is calculated, and the difference between the transmission power value of the third radio station and the transmission power value of the second radio station a, by adding the received power value from the second radio station in the third radio station, to calculate a second interference power value to the second radio station from the third wireless station An interference amount calculating step;
When the first interference power value is larger than the second interference power value, the transmission power at the third radio station is added to the maximum allowable interference amount and the transmission power value at the first radio station. The value is controlled to be smaller than a value obtained by subtracting the received power value from the first wireless station in the third wireless station, and the second interference power value is greater than the first interference power value. In the case of being large, the second radio station in the third radio station is determined from the value obtained by adding the maximum allowable interference amount and the transmission power value in the second radio station to the transmission power in the third radio station. A control step for controlling to be smaller than a value obtained by subtracting the received power value from
A power control method comprising:
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