JP4235238B2 - Mobile station, communication control method - Google Patents

Mobile station, communication control method Download PDF

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JP4235238B2
JP4235238B2 JP2007252189A JP2007252189A JP4235238B2 JP 4235238 B2 JP4235238 B2 JP 4235238B2 JP 2007252189 A JP2007252189 A JP 2007252189A JP 2007252189 A JP2007252189 A JP 2007252189A JP 4235238 B2 JP4235238 B2 JP 4235238B2
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正則 加藤
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Kyocera Corp
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本発明は、符号分割多元接続(CDMA;Code Division Multiple Access)方式の無線通信システムに用いて好適な移動局、通信制御方法に関する。   The present invention relates to a mobile station and a communication control method suitable for use in a code division multiple access (CDMA) wireless communication system.

従来、移動局(携帯端末)に複数のアンテナ素子を有する適応アレーアンテナシステムを備え、MMSE(最小2乗誤差法)などを用いた受信波適応処理を行い、指向性パターンを形成して無線基地局からの無線信号を受信するものが知られている。そして、その適応アレーアンテナシステムにより、所望波の到来方向に受信ビームパターンを形成し、且つ遅延波などの干渉波の到来方向には指向性パターンのヌルを形成し抑圧することで通信品質の改善が図られている。また、移動局が、現在通信している無線基地局の位置情報に基づいて該基地局方向にビームパターンを形成するものもある(例えば、特許文献1,2参照)。
特開平8−139661号公報 特開平14−26800号公報
Conventionally, a mobile station (portable terminal) has an adaptive array antenna system having a plurality of antenna elements, performs reception wave adaptation processing using MMSE (least square error method), etc., and forms a directivity pattern to form a radio base station. One that receives a radio signal from a station is known. And, with the adaptive array antenna system, the reception beam pattern is formed in the arrival direction of the desired wave, and the directivity pattern null is formed and suppressed in the arrival direction of the interference wave such as the delayed wave, thereby improving the communication quality. Is planned. Also, there is a mobile station that forms a beam pattern in the direction of the base station based on the position information of the radio base station with which the mobile station is currently communicating (see, for example, Patent Documents 1 and 2).
JP-A-8-139661 Japanese Patent Laid-Open No. 14-26800

しかし、上述した従来の技術では、現在通信している無線基地局の方向へのビームパターンを形成するので、通信している無線基地局からの所望波に対応することはできるが、通信していない無線基地局からの干渉波には対応することができないという問題がある。   However, the conventional technology described above forms a beam pattern in the direction of the currently communicating radio base station, so that it can cope with the desired wave from the communicating radio base station, but is communicating. There is a problem that it is not possible to cope with interference waves from non-radio base stations.

本発明は、このような事情を考慮してなされたもので、その目的は、適応アレーアンテナシステムにより指向性パターンを形成して通信品質の向上を図る場合に、通信していない周辺無線基地局からの干渉波を抑圧することができる移動局、通信制御方法を提供することにある。   The present invention has been made in consideration of such circumstances, and the object thereof is to form a directional pattern by an adaptive array antenna system in order to improve communication quality and to perform a peripheral radio base station that is not communicating. It is an object of the present invention to provide a mobile station and a communication control method capable of suppressing interference waves from the mobile phone.

上記の課題を解決するために、請求項1に記載の移動局は、複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局において、自移動局の位置を測定する位置測定手段と、前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する方位測定手段と、現在通信している通信基地局及び通信していない周辺基地局の基地局位置情報を取得する基地局位置情報取得手段と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成するビームパターン形成手段と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記周辺基地局の方向を算出し、当該算出した周辺基地局方向にヌルを形成するヌル形成手段と、前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う受信処理手段と、を備えたことを特徴としている。   In order to solve the above problem, the mobile station according to claim 1 is a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements, and a position measuring unit that measures the position of the mobile station; Direction measuring means for measuring the direction in which the mobile station is directed using a predetermined reference antenna among the plurality of antenna elements, a communication base station that is currently communicating, and a peripheral base station that is not currently communicating Base station position information acquisition means for acquiring the base station position information of the mobile station, the communication base for the mobile station using the reference antenna based on the position, direction and base station position information of the mobile station. Based on the beam pattern forming means for calculating the direction of the station and forming a beam pattern in the direction of the calculated communication base station, the position of the mobile station, the direction, and the base station position information Calculates the direction of the neighboring base station with respect to its own mobile station, and receives the received signal using the beam pattern and the null to form a null in the calculated neighboring base station direction. And a processing means.

請求項2に記載の移動局は、複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局において、自移動局の位置を測定する位置測定手段と、前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する方位測定手段と、現在通信している通信基地局の基地局位置情報を取得する基地局位置情報取得手段と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成するビームパターン形成手段と、前記受信信号に基づいて干渉波の到来方向にヌルを形成するヌル形成手段と、前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う受信処理手段と、を備えたことを特徴としている。   According to a second aspect of the present invention, there is provided a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements, a position measuring unit that measures a position of the own mobile station, and a plurality of antenna elements in advance. Using the determined reference antenna, the azimuth measuring means for measuring the azimuth facing the mobile station, the base station position information obtaining means for obtaining the base station position information of the currently communicating base station, Based on the position of the mobile station, the azimuth, and the base station position information, the reference antenna is used to calculate the direction of the communication base station relative to the mobile station, and a beam pattern in the calculated communication base station direction A beam pattern forming means for forming a null, a null forming means for forming a null in the direction of arrival of an interference wave based on the received signal, the beam pattern and the null using the null A reception processing means for performing reception processing of the signal signal, and comprising the.

請求項3に記載の移動局においては、前記ビームパターンを使用して送信信号の送信処理を行う送信処理手段を備えたことを特徴とする。   According to a third aspect of the present invention, the mobile station includes a transmission processing unit that performs transmission processing of a transmission signal using the beam pattern.

請求項4に記載の通信制御方法は、複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局における通信制御方法であって、自移動局の位置を測定する過程と、前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する過程と、現在通信している通信基地局及び通信していない周辺基地局の基地局位置情報を取得する過程と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成する過程と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記周辺基地局の方向を算出し、当該算出した周辺基地局方向にヌルを形成する過程と、前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う過程と、を含むことを特徴としている。   The communication control method according to claim 4 is a communication control method in a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements, the step of measuring the position of the mobile station, and the plurality of antennas Using a predetermined reference antenna from among the elements, the process of measuring the direction in which the mobile station is facing, and the base station position information of the communication base station currently communicating and the neighboring base stations not communicating Based on the process of obtaining, the position of the own mobile station, the direction, and the base station position information, the direction of the communication base station relative to the own mobile station is calculated using the reference antenna, and the calculated communication Based on the process of forming a beam pattern in the direction of the base station, the position of the mobile station, the azimuth, and the base station position information, the direction of the surrounding base station relative to the mobile station is calculated, and the calculation is performed. A process of forming a null in peripheral base station direction, and is characterized in that it comprises the steps of performing the reception processing of the received signal using the beam pattern and the null.

請求項5に記載の通信制御方法は、複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局における通信制御方法であって、自移動局の位置を測定する過程と、前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する過程と、現在通信している通信基地局の基地局位置情報を取得する過程と、前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成する過程と、前記受信信号に基づいて干渉波の到来方向にヌルを形成する過程と、前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う過程と、を含むことを特徴としている。   The communication control method according to claim 5 is a communication control method in a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements, the step of measuring the position of the mobile station, and the plurality of antennas A process of measuring a direction in which the mobile station is facing using a predetermined reference antenna from among the elements, a process of acquiring base station position information of a currently communicating base station, and the mobile station Calculating the direction of the communication base station relative to the mobile station based on the position of the station, the azimuth, and the base station position information, forming a beam pattern in the calculated communication base station direction, and the received signal And a process of forming a null in the arrival direction of the interference wave, and a process of receiving the received signal using the beam pattern and the null.

本発明によれば、通信基地局方向のビームパターン及び周辺基地局方向のヌルにより無線信号の受信が行われるので、周辺基地局からの干渉波に対応することができる。これにより、適応アレーアンテナシステムにより指向性パターンを形成し、安定して通信品質の向上を図ることができるという優れた効果が得られる。   According to the present invention, since radio signals are received by the beam pattern in the direction of the communication base station and the null in the direction of the peripheral base station, it is possible to deal with interference waves from the peripheral base station. As a result, an excellent effect is obtained that a directivity pattern is formed by the adaptive array antenna system, and the communication quality can be stably improved.

また、本発明によれば、受信信号に基づき干渉波の到来方向にヌルを形成し、該ヌルと通信基地局方向のビームパターンにより無線信号の受信が行われるので、実際に受信された干渉波の到来方向にヌルが形成され、干渉波の影響を精度よく取り除くことができる。   According to the present invention, a null is formed in the direction of arrival of the interference wave based on the received signal, and the radio signal is received using the null and the beam pattern in the direction of the communication base station. A null is formed in the arrival direction of, and the influence of the interference wave can be accurately removed.

以下、図面を参照し、本発明の一実施形態について説明する。図1は、本発明の一実施形態による携帯端末100の構成を示すブロック図である。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a mobile terminal 100 according to an embodiment of the present invention.

この携帯端末100は、符号分割多元接続(CDMA)方式の無線通信システムにおける移動局(MS)として使用されるものである。図1において、携帯端末100は、複数のアンテナ素子ANT−1〜Nからなるアレーアンテナと、無線送受信部1と、受信波適応処理部2と、複数の受信重み付け部3−0〜Mと、レイク受信部4と、ベースバンド処理部5と、GPS(Global Positioning System)用のアンテナGPSANTと、位置情報処理部11と、方位情報処理部12と、複数の基地局方向適応処理部13−1〜Mとを有する。   The portable terminal 100 is used as a mobile station (MS) in a code division multiple access (CDMA) wireless communication system. In FIG. 1, a mobile terminal 100 includes an array antenna composed of a plurality of antenna elements ANT-1 to ANT-N, a radio transmission / reception unit 1, a received wave adaptation processing unit 2, a plurality of reception weighting units 3-0 to M, Rake receiving unit 4, baseband processing unit 5, GPS (Global Positioning System) antenna GPSANT, position information processing unit 11, azimuth information processing unit 12, and a plurality of base station direction adaptation processing units 13-1 ~ M.

無線送受信部1は、アンテナ素子ANT−1〜Nにより送信と受信を行う。なお、図1においては送信機能に係る他のブロックは省略している。アンテナ素子ANT−1〜Nの信号A1〜ANは無線送受信部1で受信された後、受信信号B1〜BNとして受信波適応処理部2及び受信重み付け部3−0〜Mに出力される。   The wireless transmission / reception unit 1 performs transmission and reception using the antenna elements ANT-1 to ANT-N. In FIG. 1, other blocks related to the transmission function are omitted. After the signals A1 to AN of the antenna elements ANT-1 to N are received by the wireless transmission / reception unit 1, they are output as reception signals B1 to BN to the reception wave adaptation processing unit 2 and the reception weighting units 3-0 to M.

受信波適応処理部2は、入力された受信信号B1〜BNに対して例えばMMSEを用いた適応信号処理を行う。この適応信号処理により、受信波に対応するアンテナ素子毎の重み係数W01〜W0Nを算出し、受信重み付け部3−0に出力する。反射波などにより受信波に対応する指向性パターンは随時変化するので、受信波適応処理部2はその変化に追従するように重み係数を求める。   The received wave adaptive processing unit 2 performs adaptive signal processing using, for example, MMSE on the input received signals B1 to BN. By this adaptive signal processing, weighting factors W01 to W0N for each antenna element corresponding to the received wave are calculated and output to the reception weighting unit 3-0. Since the directivity pattern corresponding to the received wave changes from time to time due to a reflected wave or the like, the received wave adaptation processing unit 2 obtains a weighting coefficient so as to follow the change.

受信重み付け部3−0は、入力された受信信号B1〜BNに重み係数W01〜W0Nを乗じて加算し、レイク受信部4に出力する。これにより、受信信号B1〜BNの位相と振幅が制御され、受信波の指向性パターンが形成される。   The reception weighting unit 3-0 multiplies the input reception signals B1 to BN by weighting factors W01 to W0N, and outputs the result to the rake reception unit 4. Thereby, the phase and amplitude of the reception signals B1 to BN are controlled, and a directivity pattern of the reception wave is formed.

レイク受信部4は、複数の受信信号によりレイク受信を行う。このレイク受信により、遅延波など伝搬路の異なるいくつかの所望波を最大比合成し、受信特性の改善を図る。ベースバンド処理部は、レイク受信後の受信信号についてのベースバンド信号を出力する。また、無線基地局から受信した基地局位置情報(緯度、経度)を位置情報処理部11に出力する。この基地局位置情報は、当該移動局が現在通信している無線基地局(通信基地局)の位置情報と、ハンドオフにより通信する可能性がある無線基地局(周辺基地局)の位置情報とを含む。なお、予め基地局位置情報をデータとして保存してもよい。   The rake receiving unit 4 performs rake reception using a plurality of received signals. By this rake reception, several desired waves having different propagation paths such as delayed waves are combined at the maximum ratio to improve the reception characteristics. The baseband processing unit outputs a baseband signal for the received signal after rake reception. Further, the base station position information (latitude, longitude) received from the radio base station is output to the position information processing unit 11. This base station position information includes the position information of the wireless base station (communication base station) with which the mobile station is currently communicating, and the position information of wireless base stations (neighboring base stations) that may communicate by handoff. Including. The base station position information may be stored as data in advance.

位置情報処理部11は、GPSなどの位置測定機能を有しており、アンテナGPSANTからの受信信号に基づいて自携帯端末100の位置情報(緯度、経度)を測定する。そして、その自携帯端末(MS)100の位置情報と基地局位置情報とから、無線基地局(BS)との位置関係を把握し、基準方向(例えば、真北など)に対する角度情報(θp)を算出する。図2において、携帯端末100は、通信基地局(通信BS)200−1と通信中であり、この通信基地局200−1についての基準方向に対する角度情報(θps)を算出する。また、周辺基地局(周辺BS)200−2についての基準方向に対する角度情報(θpi)を算出する。図2の例では携帯端末100が4つのアンテナ素子ANT−1〜4を備え、アンテナ素子ANT−1を基準アンテナとしている。   The position information processing unit 11 has a position measurement function such as GPS, and measures position information (latitude and longitude) of the mobile terminal 100 based on a received signal from the antenna GPSANT. Then, from the position information of the mobile terminal (MS) 100 and the base station position information, the positional relationship with the radio base station (BS) is grasped, and angle information (θp) with respect to the reference direction (for example, true north). Is calculated. In FIG. 2, the mobile terminal 100 is communicating with the communication base station (communication BS) 200-1, and calculates angle information (θps) with respect to the reference direction for the communication base station 200-1. Further, angle information (θpi) with respect to the reference direction is calculated for the peripheral base station (peripheral BS) 200-2. In the example of FIG. 2, the mobile terminal 100 includes four antenna elements ANT-1 to ANT-4, and the antenna element ANT-1 is used as a reference antenna.

方位情報処理部12は、電子コンパスなどの方位測定機能を有しており、自携帯端末100の向いている方位を測定し、基準方向に対する角度情報(θd)を算出する(図2参照)。この角度情報は複数のアンテナ素子の中から予め定められた1つの基準アンテナ(図2の例ではアンテナ素子ANT−1)を基準として求められる。   The azimuth information processing unit 12 has an azimuth measurement function such as an electronic compass, measures the azimuth that the portable terminal 100 is facing, and calculates angle information (θd) with respect to the reference direction (see FIG. 2). This angle information is obtained with reference to a predetermined reference antenna (antenna element ANT-1 in the example of FIG. 2) from a plurality of antenna elements.

基地局方向適応処理部13は、位置情報処理部11及び方位情報処理部12で得られた角度情報(θp、θd)に基づいて、自携帯端末100に対する基地局方向の角度情報を算出する。図2に示すように、通信基地局200−1についての基準方向に対する角度θpsと上記角度θdとから、自携帯端末100に対する通信基地局200−1の方向の角度θsが算出される。また、周辺基地局200−2についての基準方向に対する角度θpiと上記角度θdとから、自携帯端末100に対する周辺基地局200−2の方向の角度θiが算出される。   The base station direction adaptation processing unit 13 calculates angle information in the base station direction with respect to the mobile terminal 100 based on the angle information (θp, θd) obtained by the position information processing unit 11 and the direction information processing unit 12. As shown in FIG. 2, the angle θs of the direction of the communication base station 200-1 with respect to the mobile terminal 100 is calculated from the angle θps with respect to the reference direction for the communication base station 200-1 and the angle θd. Further, the angle θi in the direction of the peripheral base station 200-2 with respect to the mobile terminal 100 is calculated from the angle θpi with respect to the reference direction for the peripheral base station 200-2 and the angle θd.

そして、基地局方向適応処理部13−1〜Mは、その自携帯端末100に対する基地局方向の角度θs,θiから、通信基地局200−1の方向にビームパターンを形成し、且つ干渉波の発信源となりうる周辺基地局200−2の方向にヌルを形成するためのアンテナ素子毎の重み係数W11〜W1N,W21〜W2N,…,WM1〜WMNを算出する。これら重み係数は、それぞれ受信重み付け部3−1〜Mに出力される。   Then, the base station direction adaptation processing units 13-1 to 13-M form a beam pattern in the direction of the communication base station 200-1 from the angles θs and θi in the base station direction with respect to the mobile terminal 100, and the interference wave The weighting factors W11 to W1N, W21 to W2N,..., WM1 to WMN for each antenna element for forming a null in the direction of the peripheral base station 200-2 that can be a transmission source are calculated. These weighting factors are output to the reception weighting units 3-1 to M, respectively.

また、基地局方向適応処理部13−1〜Mには、受信波適応処理部2から受信波に対応するアンテナ素子毎の重み係数W01〜W0Nが入力される。基地局方向適応処理部13−1〜Mは、この重み係数W01〜W0Nに基づいて干渉波の方向を算出し、この干渉波の到来方向にヌルを形成することもできる。   In addition, the base station direction adaptation processing units 13-1 to 13-M receive the weighting factors W01 to W0N for the respective antenna elements corresponding to the received waves from the received wave adaptation processing unit 2. The base station direction adaptation processing units 13-1 to 13-M can calculate the direction of the interference wave based on the weighting factors W01 to W0N, and can form a null in the arrival direction of the interference wave.

受信重み付け部3−1〜Mは、入力された受信信号B1〜BNにそれぞれ重み係数を乗じて加算し、レイク受信部4に出力する。これにより、受信信号B1〜BNの位相と振幅が各々制御され、通信基地局200−1からの所望波の到来方向にビームパターンが形成され、且つ干渉波の到来方向にヌルが形成される。   The reception weighting units 3-1 to 3 -M multiply the input reception signals B <b> 1 to BN by weighting factors, respectively, and output the result to the rake reception unit 4. As a result, the phases and amplitudes of the received signals B1 to BN are controlled, a beam pattern is formed in the direction of arrival of the desired wave from the communication base station 200-1, and a null is formed in the direction of arrival of the interference wave.

次に、上述した図1の携帯端末100(移動局)の動作を説明する。初めに基本的な動作を説明する。先ず、位置情報処理部11は自移動局の位置情報(緯度、経度)を測定し、更に無線基地局から受信された基地局位置情報(緯度、経度)をベースバンド処理部5から受け取り、この基地局位置情報から通信基地局200−1と周辺基地局200−2のそれぞれの位置情報を得る。そして、自移動局の位置情報とそれら位置情報とから、基準方向に対する各基地局方向の角度情報(θps,θpi)を算出する。   Next, the operation of the mobile terminal 100 (mobile station) in FIG. 1 described above will be described. First, the basic operation will be described. First, the position information processing unit 11 measures the position information (latitude, longitude) of the mobile station, and further receives the base station position information (latitude, longitude) received from the radio base station from the baseband processing unit 5. The position information of each of the communication base station 200-1 and the neighboring base station 200-2 is obtained from the base station position information. Then, angle information (θps, θpi) in each base station direction with respect to the reference direction is calculated from the position information of the mobile station and the position information.

また、方位情報処理部12は、基準アンテナ素子が向いている方位(自方位)を示す方位情報を測定する。そして、基準方向に対する自方位の角度情報(θd)を算出する。   Further, the azimuth information processing unit 12 measures azimuth information indicating the azimuth (own direction) in which the reference antenna element is facing. Then, angle information (θd) of the own direction with respect to the reference direction is calculated.

基地局方向適応処理部13は、位置情報処理部11と方位情報処理部12からそれぞれ角度情報(θps,θpi,θd)を受け取り、基準アンテナ素子に対する各基地局方向の角度θs,θiを算出する。次いで、これら角度θs,θiに基づいて重み係数W11〜W1N,W21〜W2N,…,WM1〜WMNを算出し、受信重み付け部3−1〜Mにそれぞれ出力する。それら重み係数に基づいて受信重み付け部3−1〜Mにより受信信号B1〜BNの位相と振幅が制御され、通信基地局200−1の方向へのビームパターンと、周辺基地局200−2の方向へのヌルが形成される。   The base station direction adaptive processing unit 13 receives angle information (θps, θpi, θd) from the position information processing unit 11 and the azimuth information processing unit 12, and calculates angles θs, θi in the direction of each base station with respect to the reference antenna element. . Next, weighting factors W11 to W1N, W21 to W2N,..., WM1 to WMN are calculated based on these angles θs and θi, and output to the reception weighting units 3-1 to M, respectively. Based on these weighting factors, the reception weighting units 3-1 to M control the phase and amplitude of the reception signals B1 to BN, the beam pattern in the direction of the communication base station 200-1, and the direction of the neighboring base station 200-2. A null is formed.

また、受信波適応処理部2は、受信した所望波の参照信号に基づいて、当該受信波の到来方向にビームパターンを形成し、且つ干渉波の到来方向にヌルを形成するように、重み係数W01〜W0Nを算出して受信重み付け部3−0に出力する。そして、受信重み付け部3−0により受信信号B1〜BNの位相と振幅が該重み係数に基づき制御され、受信波の到来方向へのビームパターンと、干渉波の到来方向へのヌルが形成される。   Further, the received wave adaptation processing unit 2 forms a beam pattern in the arrival direction of the received wave based on the received reference signal of the desired wave and forms a weight coefficient in the arrival direction of the interference wave. W01 to W0N are calculated and output to the reception weighting unit 3-0. Then, the phase and amplitude of the reception signals B1 to BN are controlled by the reception weighting unit 3-0 based on the weighting factor, and a beam pattern in the arrival direction of the reception wave and a null in the arrival direction of the interference wave are formed. .

レイク受信部4は、それぞれ形成された上記ビームパターンとヌルを組み合わせて所望波をそれぞれ受信し、レイク受信を行う。   The rake receiving unit 4 receives the desired waves by combining the beam patterns and nulls formed respectively, and performs rake reception.

次に、上記した通信基地局方向のビームパターンを形成するための重み係数の算出方法の例を説明する。先ず、通信基地局と移動局(携帯端末100)のそれぞれの位置情報(経度、緯度)により移動局を中心として基準方向に対する通信基地局方向の角度θpsを算出する。ここで、角度θaを次式(1)で定義する。

Figure 0004235238
Next, an example of a weight coefficient calculation method for forming the beam pattern in the communication base station direction will be described. First, an angle θps in the direction of the communication base station with respect to the reference direction around the mobile station is calculated based on the position information (longitude and latitude) of each of the communication base station and the mobile station (portable terminal 100). Here, the angle θa is defined by the following equation (1).
Figure 0004235238

但し、Diは移動局の位置における緯度1秒当たりの距離、Dkは経度1秒当たりの距離である。なお、これらの値Di,Dkは、所定の地域範囲では同じ値としてでよい。   Here, Di is the distance per second of latitude at the position of the mobile station, and Dk is the distance per second of longitude. These values Di and Dk may be the same value in a predetermined area range.

そして、下記(a)〜(h)に示す条件より、基準方向(この例では真北を基準とし、東回りを+とする)に対する角度θpsを求める。条件(a)〜(h)には移動局と通信基地局の位置関係に対応する角度θpsが示されている。
(a)移動局経度<基地局経度、移動局緯度<基地局緯度;θps=θa
(b)移動局経度<基地局経度、移動局緯度>基地局緯度;θps=180度−θa
(c)移動局経度>基地局経度、移動局緯度>基地局緯度;θps=180度+θa
(d)移動局経度>基地局経度、移動局緯度<基地局緯度;θps=360度−θa
(e)移動局経度=基地局経度、移動局緯度<基地局緯度;θps=0度
(f)移動局経度=基地局経度、移動局緯度>基地局緯度;θps=180度
(g)移動局経度<基地局経度、移動局緯度=基地局緯度;θps=90度
(h)移動局経度>基地局経度、移動局緯度=基地局緯度;θps=270度
次いで、基準方向に対する通信基地局方向の角度θpsと移動局の方位角度θdとから、次式(2)〜(4)により基準アンテナに対する通信基地局方向の角度θsを算出する。

Figure 0004235238
Then, an angle θps with respect to a reference direction (in this example, with true north as a reference and eastward rotation as +) is obtained from the conditions shown in the following (a) to (h). Conditions (a) to (h) indicate an angle θps corresponding to the positional relationship between the mobile station and the communication base station.
(A) Mobile station longitude <base station longitude, mobile station latitude <base station latitude; θps = θa
(B) Mobile station longitude <base station longitude, mobile station latitude> base station latitude; θps = 180 degrees−θa
(C) Mobile station longitude> base station longitude, mobile station latitude> base station latitude; θps = 180 degrees + θa
(D) Mobile station longitude> base station longitude, mobile station latitude <base station latitude; θps = 360 degrees−θa
(E) Mobile station longitude = base station longitude, mobile station latitude <base station latitude; θps = 0 degrees
(F) Mobile station longitude = base station longitude, mobile station latitude> base station latitude; θps = 180 degrees
(G) Mobile station longitude <base station longitude, mobile station latitude = base station latitude; θps = 90 degrees
(H) Mobile station longitude> base station longitude, mobile station latitude = base station latitude; θps = 270 degrees Next, from the angle θps of the communication base station direction with respect to the reference direction and the azimuth angle θd of the mobile station, the following equation (2) The angle θs in the direction of the communication base station with respect to the reference antenna is calculated from (4).
Figure 0004235238

次いで、基準アンテナに対する通信基地局方向の角度θsから重み係数を算出する。以下に重み係数W11,W12の計算例を示す。この例の条件は、アレーアンテナのアンテナ素子数Nは2、アンテナ素子の間隔はλ/2、所望波の電力は1、干渉波はなしである。
W11=1
W12=exp(−jπsinθs)
なお、上記算出方法は一例であり、素子数、素子間隔、配置などの条件により計算式は異なる。
Next, a weighting coefficient is calculated from the angle θs in the direction of the communication base station with respect to the reference antenna. An example of calculating the weighting factors W11 and W12 is shown below. In this example, the number of antenna elements N of the array antenna is 2, the distance between the antenna elements is λ / 2, the power of the desired wave is 1, and there is no interference wave.
W11 = 1
W12 = exp (−jπsin θs)
Note that the above calculation method is an example, and the calculation formula varies depending on conditions such as the number of elements, element spacing, and arrangement.

次に、通信基地局方向へのビームパターンに、干渉波に対するヌルを加味する方法を説明する。初めに、周辺基地局の位置情報によりヌルを形成する場合を説明する。周辺基地局200−2の位置情報と移動局(携帯端末100)の位置情報に基づいて、干渉波の発信源となりうる周辺基地局の方向に対してヌルを形成し、通信基地局方向へのビームパターンと合成する。干渉波の発信源となりうる周辺基地局には、例えば移動局と周辺基地局との距離が通信基地局以外で最も近い順に周辺基地局を選択する。なお、この基地局の選択は、基地局方向適応処理部の数のM個まで対応可能である。   Next, a method for adding nulls for interference waves to the beam pattern toward the communication base station will be described. First, a case where a null is formed based on position information of neighboring base stations will be described. Based on the location information of the neighboring base station 200-2 and the location information of the mobile station (portable terminal 100), a null is formed in the direction of the neighboring base station that can be a source of interference waves, Combine with beam pattern. For the peripheral base stations that can be a source of interference waves, for example, the peripheral base stations are selected in the order in which the distance between the mobile station and the peripheral base station is the closest to that other than the communication base station. It should be noted that this selection of base stations can support up to M base station direction adaptive processing units.

これにより、図3に示すように、通信基地局200−1の方向にビームパターンが形成され、且つ干渉波の発信源となりうる周辺基地局200−2(周辺BS1)の方向にヌルが形成される。また、基地局の位置情報に基づいてビームパターン及びヌルが形成されるので、それらパターンの形成は周辺環境に影響されることがない。したがって、図4に示すように、所望波や干渉波が周囲の建物などで遮られても、ビームパターン及びヌルは常に安定して形成される。   As a result, as shown in FIG. 3, a beam pattern is formed in the direction of the communication base station 200-1, and a null is formed in the direction of the peripheral base station 200-2 (peripheral BS1) that can be a source of interference waves. The Further, since the beam pattern and null are formed based on the position information of the base station, the formation of these patterns is not affected by the surrounding environment. Therefore, as shown in FIG. 4, even if a desired wave or an interference wave is blocked by a surrounding building or the like, the beam pattern and the null are always formed stably.

これにより、例えば干渉波が建物などに遮蔽されていた状態から、移動局が移動したことにより直接に干渉波が到来する状態に変化しても、予め干渉波の発信源の方向にヌルを形成しているので、干渉波の影響は少ない。この結果、通信していない無線基地局からの干渉波に対して安定的に対応することができるので、通信品質が安定する。   As a result, for example, even if the state where the interference wave is shielded by a building or the like changes to a state where the interference wave arrives directly due to movement of the mobile station, a null is formed in the direction of the interference wave source in advance. Therefore, the influence of the interference wave is small. As a result, it is possible to stably cope with an interference wave from a wireless base station that is not communicating, so that communication quality is stabilized.

以下に、干渉波の発信源となりうる周辺基地局の方向にヌルを形成するための重み係数の計算方法の例を説明する。先ず、上記した通信基地局方向のビームパターンを形成するための重み係数の算出方法と同様にして、周辺基地局と移動局(携帯端末100)のそれぞれの位置情報(経度、緯度)に基づき、基準方向に対する周辺基地局の角度θpiを算出する。そして、この角度θpiと移動局の方位角度θdから基準アンテナに対する周辺基地局の方向の角度θiを算出する。この角度情報θiと、基準アンテナに対する通信基地局の方向の角度θsとから重み係数を算出する。以下に重み係数W11,W12の計算例(5)(6)を示す。この例の条件は、アレーアンテナのアンテナ素子数Nは2、アンテナ素子の間隔はλ/2、所望波の電力は1、干渉波の電力は1、内部雑音の電力は0.01(20dB)である。

Figure 0004235238
Hereinafter, an example of a weight coefficient calculation method for forming a null in the direction of a neighboring base station that can be a source of interference waves will be described. First, in the same manner as the weighting factor calculation method for forming the beam pattern in the direction of the communication base station described above, based on the position information (longitude, latitude) of the surrounding base station and the mobile station (mobile terminal 100), An angle θpi of the surrounding base station with respect to the reference direction is calculated. Then, from this angle θpi and the azimuth angle θd of the mobile station, an angle θi in the direction of the surrounding base station with respect to the reference antenna is calculated. A weighting coefficient is calculated from the angle information θi and the angle θs of the direction of the communication base station with respect to the reference antenna. The calculation examples (5) and (6) of the weighting factors W11 and W12 are shown below. In this example, the number of antenna elements N of the array antenna is 2, the interval between the antenna elements is λ / 2, the power of the desired wave is 1, the power of the interference wave is 1, and the power of the internal noise is 0.01 (20 dB) It is.
Figure 0004235238

なお、上記算出方法は一例であり、素子数、素子間隔、配置などの条件により計算式は異なる。   Note that the above calculation method is an example, and the calculation formula varies depending on conditions such as the number of elements, element spacing, and arrangement.

次に、受信波適応処理部2により形成される指向性パターンに基づきヌルを形成する場合を説明する。受信波適応処理部2により形成される指向性パターンには、干渉波の到来方向の情報が含まれている。そこで、受信波適応処理部2により算出された重み係数W01〜W0Nを基地局方位適応処理部13−1〜Mに渡し、その重み係数W01〜W0Nに基づいて干渉波の到来方向の角度を算出する。そして、その干渉波の到来方向の角度に基づいてヌルを形成し、通信基地局の方向へのビームパターンと合成する。   Next, a case where nulls are formed based on the directivity pattern formed by the received wave adaptive processing unit 2 will be described. The directivity pattern formed by the received wave adaptation processing unit 2 includes information on the arrival direction of the interference wave. Therefore, the weighting factors W01 to W0N calculated by the received wave adaptation processing unit 2 are passed to the base station direction adaptation processing units 13-1 to 13-M, and the angle of arrival of the interference wave is calculated based on the weighting factors W01 to W0N. To do. And null is formed based on the angle of the arrival direction of the interference wave, and it combines with the beam pattern in the direction of the communication base station.

なお、重み係数W01〜W0Nから干渉波の到来方向の角度を求める際には、例えば、重み係数W01〜W0Nからある角度毎に0から360度の受信感度の電力を計算し、その受信感度の中で一番低い感度点の角度を求めればよい。   When obtaining the angle of the arrival direction of the interference wave from the weighting factors W01 to W0N, for example, the power of the receiving sensitivity of 0 to 360 degrees is calculated for each angle from the weighting factors W01 to W0N, What is necessary is just to obtain the angle of the lowest sensitivity point among them.

これにより、図5に示すように、通信基地局200−1の方向にビームパターンが形成され、且つ干渉波の到来方向にヌルが形成される。また、通信基地局の位置情報に基づいてビームパターンが形成されるので、そのビームパターンの形成は周辺環境に影響されることがない。したがって、図6に示すように、所望波が周囲の建物なので遮られても、指向性パターンは常に安定して形成される。さらに、実際に受信された干渉波の到来方向にヌルが形成されるので、干渉波の影響を精度よく取り除くことができる。なお、重み係数の計算方法は上記した干渉波の発信源となりうる周辺基地局の方向にヌルを形成するための重み係数の計算方法と同様である。なお、通信基地局(200−1)の方向へのビームパターンと干渉波の到来方向へのヌルの方向がある範囲内で同じである場合は、どちらか一方を選択する。   Thereby, as shown in FIG. 5, a beam pattern is formed in the direction of the communication base station 200-1, and a null is formed in the direction of arrival of the interference wave. In addition, since the beam pattern is formed based on the position information of the communication base station, the formation of the beam pattern is not affected by the surrounding environment. Therefore, as shown in FIG. 6, even if the desired wave is a surrounding building, the directivity pattern is always formed stably even if it is blocked. Furthermore, since nulls are formed in the direction of arrival of the actually received interference wave, the influence of the interference wave can be accurately removed. The weighting factor calculation method is the same as the weighting factor calculation method for forming nulls in the direction of the neighboring base stations that can be the source of the interference wave. If the beam pattern in the direction of the communication base station (200-1) and the null direction in the direction of arrival of the interference wave are the same within a certain range, either one is selected.

なお、上記した通信基地局方向へのビームパターンに干渉波に対するヌルを加味する方法については、周辺基地局の位置情報によりヌルを形成し行う第1の方法または受信波適応処理部2により形成される指向性パターンに基づきヌルを形成し行う第2の方法のいずれかを実装してもよく、あるいは双方を実装するようにしてもよい。また、それら第1及び第2の方法の双方を実装する場合には、いずれかの方法を適宜選択するようにしてもよく、あるいは並列処理し、レイク受信部4により受信波を合成するようにしてもよい。   Note that the above-described method of adding nulls to interference waves to the beam pattern in the direction of the communication base station is formed by the first method or the received wave adaptive processing unit 2 that forms nulls based on position information of neighboring base stations. One of the second methods of forming nulls based on the directivity pattern may be implemented, or both may be implemented. When both the first and second methods are implemented, either method may be selected as appropriate, or parallel processing is performed so that the rake reception unit 4 synthesizes the received wave. May be.

なお、上述した実施形態では、受信処理を例に挙げて説明したが、送信処理にも同様に適用可能である。送信時には、受信時に得られたそれぞれの指向性パターンの重み係数を元に送信周波数に対応する補正などを行う。そして、その補正された重み係数により、位相と振幅を制御して送信用の指向性パターンを形成する。   In the above-described embodiment, the reception process is described as an example, but the present invention can be similarly applied to the transmission process. At the time of transmission, correction corresponding to the transmission frequency is performed based on the weighting factor of each directivity pattern obtained at the time of reception. Then, the phase and amplitude are controlled by the corrected weighting factor to form a directivity pattern for transmission.

なお、上述した図1の実施形態においては、基地局方向適応処理部13−1〜Mと受信重み付け部3−1〜Mが基地局方向ビームパターン形成手段及び基地局方向ヌル形成手段に対応する。また、受信波適応処理部2と受信重み付け部3−0が受信波指向性パターン(受信波ビームパターン及び受信波ヌル)形成手段に対応する。また、レイク受信部4が受信処理手段に対応する。また、ベースバンド処理部5が基地局位置情報取得手段に対応する。   1, the base station direction adaptive processing units 13-1 to 13-M and the reception weighting units 3-1 to M correspond to the base station direction beam pattern forming unit and the base station direction null forming unit. . The received wave adaptation processing unit 2 and the reception weighting unit 3-0 correspond to a received wave directivity pattern (received wave beam pattern and received wave null) forming unit. The rake receiving unit 4 corresponds to a reception processing unit. The baseband processing unit 5 corresponds to a base station position information acquisition unit.

なお、本発明の移動局としては、例えば携帯電話機やPDA(Personal Digital Assistants:個人用情報機器)と称される携帯型の端末も含むものとする。ここで、PDAの場合、無線通信手段を内蔵しているものとする。また、GPS機能及び電子コンパス機能などの位置や方位情報取得手段を有するカーナビゲーションシステムを備えた自動車電話機又は移動物体に搭載された様々な無線装置も同様に含まれる。   Note that the mobile station of the present invention includes, for example, a portable terminal called a mobile phone or a PDA (Personal Digital Assistant). Here, in the case of a PDA, it is assumed that wireless communication means is incorporated. In addition, various wireless devices mounted on a mobile phone or a moving object including a car navigation system having a position and orientation information acquisition unit such as a GPS function and an electronic compass function are also included.

また、移動局の位置や方位情報については、移動局の近隣に在る外付け等で接続される外部の位置又は方位情報取得装置(例えばGPS)から取得するようにしてもよい。   Further, the position and azimuth information of the mobile station may be acquired from an external position or azimuth information acquisition device (for example, GPS) connected externally in the vicinity of the mobile station.

以上、本発明の実施形態を図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等も含まれる。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.

本発明の一実施形態による携帯端末100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 portable terminal 100 by one Embodiment of this invention. 本発明の一実施形態による通信制御方法を説明するための第1の図である。It is a 1st figure for demonstrating the communication control method by one Embodiment of this invention. 本発明の一実施形態による通信制御方法を説明するための第2の図である。It is a 2nd figure for demonstrating the communication control method by one Embodiment of this invention. 本発明の一実施形態による通信制御方法を説明するための第3の図である。It is a 3rd figure for demonstrating the communication control method by one Embodiment of this invention. 本発明の一実施形態による通信制御方法を説明するための第4の図である。It is a 4th figure for demonstrating the communication control method by one Embodiment of this invention. 本発明の一実施形態による通信制御方法を説明するための第5の図である。It is a 5th figure for demonstrating the communication control method by one Embodiment of this invention.

符号の説明Explanation of symbols

1:無線送受信部、2:受信波適応処理部、3−0〜M:受信重み付け部、4:レイク受信部、5:ベースバンド処理部、11:位置情報処理部、12:方位情報処理部、13−1〜M:基地局方向適応処理部、100:携帯端末(移動局)、200−1:無線基地局(通信基地局)、200−2:無線基地局(周辺基地局)、ANT−1〜N:アンテナ素子、GPSANT:GPS用アンテナ。   1: wireless transmission / reception unit, 2: received wave adaptation processing unit, 3-0 to M: reception weighting unit, 4: rake reception unit, 5: baseband processing unit, 11: position information processing unit, 12: direction information processing unit , 13-1 to M: base station direction adaptation processing unit, 100: portable terminal (mobile station), 200-1: radio base station (communication base station), 200-2: radio base station (neighboring base station), ANT −1 to N: antenna element, GPSANT: GPS antenna.

Claims (5)

複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局において、
自移動局の位置を測定する位置測定手段と、
前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する方位測定手段と、
現在通信している通信基地局及び通信していない周辺基地局の基地局位置情報を取得する基地局位置情報取得手段と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成するビームパターン形成手段と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記周辺基地局の方向を算出し、当該算出した周辺基地局方向にヌルを形成するヌル形成手段と、
前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う受信処理手段と、
を備えたことを特徴とする移動局。
In a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
Position measuring means for measuring the position of the mobile station;
Azimuth measuring means for measuring the azimuth of the mobile station using a predetermined reference antenna among the plurality of antenna elements;
A base station position information acquisition means for acquiring base station position information of a communication base station that is currently communicating and a neighboring base station that is not communicating;
Based on the position of the mobile station, the azimuth, and the base station position information, the reference antenna is used to calculate the direction of the communication base station relative to the mobile station, and the beam is transmitted in the calculated communication base station direction. Beam pattern forming means for forming a pattern;
A null forming means for calculating a direction of the neighboring base station relative to the own mobile station based on the position of the own mobile station, the azimuth, and the base station position information, and forming a null in the calculated neighboring base station direction,
Reception processing means for performing reception processing of the received signal using the beam pattern and the null;
A mobile station characterized by comprising:
複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局において、
自移動局の位置を測定する位置測定手段と、
前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する方位測定手段と、
現在通信している通信基地局の基地局位置情報を取得する基地局位置情報取得手段と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成するビームパターン形成手段と、
前記受信信号に基づいて干渉波の到来方向にヌルを形成するヌル形成手段と、
前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う受信処理手段と、
を備えたことを特徴とする移動局。
In a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
Position measuring means for measuring the position of the mobile station;
Azimuth measuring means for measuring the azimuth of the mobile station using a predetermined reference antenna among the plurality of antenna elements;
Base station position information acquisition means for acquiring base station position information of a communication base station that is currently communicating;
Based on the position of the mobile station, the azimuth, and the base station position information, the reference antenna is used to calculate the direction of the communication base station relative to the mobile station, and the beam is transmitted in the calculated communication base station direction. Beam pattern forming means for forming a pattern;
Null forming means for forming a null in the arrival direction of the interference wave based on the received signal;
Reception processing means for performing reception processing of the received signal using the beam pattern and the null;
A mobile station characterized by comprising:
前記ビームパターンを使用して送信信号の送信処理を行う送信処理手段を備えたことを特徴とする請求項1または請求項2に記載の移動局。   The mobile station according to claim 1, further comprising transmission processing means for performing transmission processing of a transmission signal using the beam pattern. 複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局における通信制御方法であって、
自移動局の位置を測定する過程と、
前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する過程と、
現在通信している通信基地局及び通信していない周辺基地局の基地局位置情報を取得する過程と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて、前記基準アンテナを用いて、自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成する過程と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記周辺基地局の方向を算出し、当該算出した周辺基地局方向にヌルを形成する過程と、
前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う過程と、
を含むことを特徴とする通信制御方法。
A communication control method in a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
The process of measuring the position of its own mobile station,
A process of measuring a direction in which the mobile station is facing, using a predetermined reference antenna among the plurality of antenna elements;
A process of acquiring base station position information of a communication base station that is currently communicating and a neighboring base station that is not communicating,
Based on the position of the mobile station, the azimuth, and the base station position information, the reference antenna is used to calculate the direction of the communication base station relative to the mobile station, and the beam is transmitted in the calculated communication base station direction. The process of forming the pattern;
Calculating the direction of the neighboring base station relative to the own mobile station based on the position and direction of the own mobile station and the base station position information, and forming a null in the calculated neighboring base station direction;
Performing a reception process of the received signal using the beam pattern and the null;
The communication control method characterized by including.
複数のアンテナ素子を有するアレーアンテナにより無線信号を受信する移動局における通信制御方法であって、
自移動局の位置を測定する過程と、
前記複数のアンテナ素子の中から予め定められた基準アンテナを用いて、自移動局の向いている方位を測定する過程と、
現在通信している通信基地局の基地局位置情報を取得する過程と、
前記自移動局の位置と前記方位と前記基地局位置情報とに基づいて自移動局に対する前記通信基地局の方向を算出し、当該算出した通信基地局方向にビームパターンを形成する過程と、
前記受信信号に基づいて干渉波の到来方向にヌルを形成する過程と、
前記ビームパターン及び前記ヌルを使用して前記受信信号の受信処理を行う過程と、
を含むことを特徴とする通信制御方法。
A communication control method in a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
The process of measuring the position of its own mobile station,
A process of measuring a direction in which the mobile station is facing, using a predetermined reference antenna among the plurality of antenna elements;
The process of acquiring the base station location information of the communication base station that is currently communicating,
Calculating a direction of the communication base station with respect to the mobile station based on the position of the mobile station, the azimuth, and the base station position information, and forming a beam pattern in the calculated communication base station direction;
Forming a null in the direction of arrival of the interference wave based on the received signal;
Performing a reception process of the received signal using the beam pattern and the null;
The communication control method characterized by including.
JP2007252189A 2007-09-27 2007-09-27 Mobile station, communication control method Expired - Fee Related JP4235238B2 (en)

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CN114499616A (en) * 2022-01-29 2022-05-13 重庆邮电大学 Resource allocation method for relieving cellular network interference

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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