JP4235239B2 - Mobile station, communication control method - Google Patents

Description

  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.

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 (for example, see Patent Documents 1 and 2).
JP-A-8-139661 Japanese Patent Laid-Open No. 14-26800

  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.

  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.

In order to solve the above problem, a 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 beam pattern in an arrival direction of a desired wave based on the received signal. A first beam pattern forming means for forming the position, a position measuring means for measuring the position of the own mobile station, an azimuth measuring means for measuring the direction to which the own mobile station is directed, a communication base station currently communicating, Base station position information acquisition means for acquiring base station position information of neighboring base stations that are not communicating, and the communication base station for the own mobile station based on the position, direction, and base station position information of the own mobile station Based on the second pattern forming means for forming a beam pattern in the calculated communication base station direction, the position of the mobile station, the azimuth, and the base station position information Calculating a direction of the neighboring base station with respect to the mobile station, and forming a null in the calculated neighboring base station direction, a beam pattern calculated by the first beam pattern forming means, or the second Combining means for combining the beam pattern formed by the beam pattern forming means and the null formed by the null forming means;
Reception processing means for performing reception processing of the received signal using the beam pattern and the null synthesized by the synthesis means.

  The mobile station according to claim 2, wherein the mobile station receives a radio signal by an array antenna having a plurality of antenna elements, and forms a beam pattern in a direction of arrival of a desired wave based on the received signal. A position measuring means for measuring the position of the own mobile station, an azimuth measuring means for measuring the direction in which the own mobile station is facing, and a base station position for acquiring base station position information of the currently communicating communication base station Based on the information acquisition means, the position of the mobile station, the orientation, and the base station position information, the direction of the communication base station relative to the mobile station is calculated, and a beam pattern is formed in the calculated communication base station direction Second beam pattern forming means, null forming means for forming nulls in the direction of arrival of the interference wave based on the received signal, and a beam calculated by the first beam pattern forming means. Or a beam pattern formed by the second beam pattern forming unit and a null formed by the null forming unit, and the beam pattern combined by the combining unit and Reception processing means for performing reception processing of the received signal using the null.

  According to a third 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 the position of the mobile station, and a direction in which the mobile station is directed. Direction measuring means for measuring, base station position information acquiring 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, the position of the own mobile station, the direction, and the Calculating a direction of the communication base station relative to the own mobile station based on the base station position information, forming a beam pattern in the calculated communication base station direction, and the position and orientation of the own mobile station Based on the base station position information and the base station position information, calculating a direction of the peripheral base station relative to the mobile station, and forming a null in the calculated peripheral base station direction; Based on the second null forming means for forming a null in the direction of arrival of the interference wave, the null formed by the first null forming means, or the null formed by the second null forming means The received signal using the selected null, the beam pattern calculated by the beam pattern forming unit, the combining unit for combining, and the beam pattern and the null combined by the combining unit. And receiving processing means for performing the receiving processing.

  5. The mobile station according to claim 4, wherein in the mobile station receiving a radio signal by an array antenna having a plurality of antenna elements, a first beam pattern forming that forms a beam pattern in a direction of arrival of a desired wave based on the received signal. Means, position measuring means for measuring the position of the own mobile station, direction measuring means for measuring the direction in which the own mobile station is directed, and the base stations of the communication base station currently communicating and the peripheral base stations not communicating Base station position information acquisition means for acquiring station position information, and calculates the direction of the communication 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, the calculated Second pattern forming means for forming a beam pattern in the direction of the communication base station; and the peripheral base for the mobile station based on the position, the azimuth, and the base station position information of the mobile station A first null forming means for forming a null in the calculated neighboring base station direction, a second null forming means for forming a null in the arrival direction of the interference wave based on the received signal, A beam pattern calculated by the first beam pattern forming unit and / or a beam pattern formed by the second beam pattern forming unit, a null formed by the first null forming unit, and / or Alternatively, a receiving unit that combines the null formed by the second null forming unit and a receiving process for receiving the received signal using the beam pattern and the null combined by the combining unit. And a processing means.

  The mobile station according to claim 5 is characterized by comprising transmission processing means for performing transmission processing of a transmission signal using the beam pattern.

  The communication control method according to claim 6 is a communication control method in a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements, and forms a beam pattern in a direction of arrival of a desired wave based on the received signal. A first beam pattern forming process, a position measuring process for measuring the position of the own mobile station, an azimuth measuring process for measuring an azimuth facing the own mobile station, a communication base station currently in communication and a communication Base station position information acquisition process for acquiring base station position information of neighboring base stations, and the direction of the communication base station relative to the own mobile station based on the position, direction and base station position information of the own mobile station Based on the calculated second beam pattern forming process in the direction of the communication base station, the position of the mobile station, the azimuth, and the base station position information. Calculating a direction of the neighboring base station relative to the mobile station, forming a null in the calculated neighboring base station direction, and forming a null in the arrival direction of the interference wave based on the received signal A second null forming process, a beam pattern formed in the first beam pattern forming process, and / or a beam pattern formed in the second beam pattern forming process, and the first null forming. Combining the null formed in the process and / or the null formed in the second null forming process, and receiving the received signal using the combined beam pattern and the null And a reception processing process for performing processing.

  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.

  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.

  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.

  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.

  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.

  The reception wave adaptive processing unit 2 performs adaptive signal processing using, for example, MMSE on the input reception 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.

  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.

  The rake receiving unit 4 performs rake reception with 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. Also, 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 location information includes the location information of the radio base station (communication base station) with which the mobile station is currently communicating, and the location information of radio base stations (neighboring base stations) that may communicate by handoff. Including. The base station position information may be stored as data in advance.

  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.

  The azimuth information processing unit 12 has an azimuth measurement function such as an electronic compass, measures the azimuth that the portable terminal 100 faces, 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.

  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.

  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.

  Also, the base station direction adaptation processing units 13-1 to 13-M are input with the weighting factors W01 to W0N for the respective antenna elements corresponding to the reception waves from the reception 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.

  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.

  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.

  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.

  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.

  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. .

  The rake receiving unit 4 receives the desired waves by combining the beam patterns and nulls formed respectively, and performs rake reception.

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).

  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.

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).

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.

  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.

  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.

  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.

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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

  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.

It is a block diagram which shows the structure of the portable terminal 100 by one Embodiment of this invention. It is a 1st figure for demonstrating the communication control method by one Embodiment of this invention. It is a 2nd figure for demonstrating the communication control method by one Embodiment of this invention. It is a 3rd figure for demonstrating the communication control method by one Embodiment of this invention. It is a 4th figure for demonstrating the communication control method by one Embodiment of this invention. It is a 5th figure for demonstrating the communication control method by one Embodiment of this invention.

Explanation of symbols

  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 (6)

In a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
First beam pattern forming means for forming a beam pattern in the direction of arrival of a desired wave based on a received signal;
Position measuring means for measuring the position of the mobile station;
Azimuth measuring means for measuring the azimuth of the mobile station,
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;
A second pattern for 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 means;
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,
A combining unit that combines the beam pattern calculated by the first beam pattern forming unit or the beam pattern formed by the second beam pattern forming unit and the null formed by the null forming unit;
Reception processing means for performing reception processing of the received signal using the beam pattern and the null synthesized by the synthesis means;
A mobile station characterized by comprising: In a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
First pattern forming means for forming a beam pattern in the direction of arrival of a desired wave based on a received signal;
Position measuring means for measuring the position of the mobile station;
Azimuth measuring means for measuring the azimuth of the mobile station,
Base station position information acquisition means for acquiring base station position information of a communication base station that is currently communicating;
A second beam that calculates 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 forms a beam pattern in the calculated communication base station direction Pattern forming means;
Null forming means for forming a null in the arrival direction of the interference wave based on the received signal;
A combining unit that combines the beam pattern calculated by the first beam pattern forming unit or the beam pattern formed by the second beam pattern forming unit and the null formed by the null forming unit;
Reception processing means for performing reception processing of the received signal using the beam pattern and the null synthesized by the synthesis means;
A mobile station characterized by comprising: 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,
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;
Beam pattern forming means for 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 When,
First null formation that calculates 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 forms a null in the calculated neighboring base station direction Means,
Second null forming means for forming a null in the direction of arrival of the interference wave based on the received signal;
Either the null formed by the first null forming means or the null formed by the second null forming means is selected, and the selected null and the beam pattern calculated by the beam pattern forming means are selected. And a synthesis means to synthesize,
Reception processing means for performing reception processing of the received signal using the beam pattern and the null synthesized by the synthesis means;
A mobile station characterized by comprising: In a mobile station that receives a radio signal by an array antenna having a plurality of antenna elements,
First beam pattern forming means for forming a beam pattern in the direction of arrival of a desired wave based on a received signal;
Position measuring means for measuring the position of the mobile station;
Azimuth measuring means for measuring the azimuth of the mobile station,
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;
A second pattern for 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 means;
First null formation that calculates 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 forms a null in the calculated neighboring base station direction Means,
Second null forming means for forming a null in the direction of arrival of the interference wave based on the received signal;
A beam pattern calculated by the first beam pattern forming unit and / or a beam pattern formed by the second beam pattern forming unit, a null formed by the first null forming unit, and / or Or a combining means for combining the null formed by the second null forming means;
Reception processing means for performing reception processing of the received signal using the beam pattern and the null synthesized by the synthesis means;
A mobile station characterized by comprising:   The mobile station according to any one of claims 1 to 4, further comprising transmission processing means for performing transmission processing of a transmission signal using the beam pattern. A communication control method in a mobile station for receiving a radio signal by an array antenna having a plurality of antenna elements,
A first beam pattern forming process for forming a beam pattern in the direction of arrival of a desired wave based on a received signal;
A position measurement process for measuring the position of the mobile station;
An azimuth measurement process for measuring the direction in which the mobile station is facing,
A base station location information acquisition process for acquiring base station location information of a communication base station currently communicating and a neighboring base station not communicating;
A second beam that calculates a direction of the communication base station relative to the mobile station based on the position of the mobile station, the azimuth, and the base station position information, and that forms a beam pattern in the calculated communication base station direction; Pattern formation process,
First null formation that calculates 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 forms a null in the calculated neighboring base station direction Process,
A second null forming process for forming a null in the direction of arrival of the interference wave based on the received signal;
The beam pattern formed in the first beam pattern formation process and / or the beam pattern formed in the second beam pattern formation process, the null formed in the first null formation process, and / or Or a synthesis process for synthesizing the null formed in the second null formation process;
A receiving process for receiving the received signal using the combined beam pattern and the null;
The communication control method characterized by including.

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