JP2008294728A - Antenna beam controlling method, antenna beam controlling apparatus, and mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when a mobile radio terminal moves from a cellular radio network to a radio LAN, communication cannot be performed efficiently between a radio LAN base station and the mobile radio terminal and a configuration for controlling antenna beams of the radio LAN base station is complicated. <P>SOLUTION: A mobile radio base station 3 estimates a distance and an angle of direction from the mobile radio base station 3 to the mobile radio terminal 5 and notifies a database device 9 of information 8 on installation position of its own device. Then, the database device 9 notifies the mobile radio base station 3 of information on the installation position of the radio LAN base station 1 located around the mobile radio base station 3. The mobile radio base station 3 estimates a distance and an angle of direction from the radio LAN base station 1 to the mobile radio terminal 5 and notifies the radio LAN base station 1 of the estimated values as mobile radio terminal position information 6. According to the mobile radio terminal position information 6, the radio LAN base station 1 turns antenna beams toward the mobile radio terminal 5 of which the distance and the angle of direction are estimated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna beam control method, an antenna beam control apparatus, and a mobile communication system, and more particularly, to an antenna beam control method, an antenna beam control apparatus, and a mobile communication system of a radio base station using mobile radio position information.

  In mobile radio systems based on code division multiple access (CDMA), orthogonal codes are assigned to each mobile radio terminal and communication is performed using the same frequency, so communication quality is improved and frequency utilization efficiency is improved. For this purpose, the base station performs communication using the directivity control of the adaptive antenna. In this adaptive antenna, a plurality of antenna elements are regularly arranged, and in reception, different amplitude and phase components obtained through the respective antenna elements are weighted to form a spatial filter, and in transmission, an appropriate amplitude is obtained. -Arbitrary directivity characteristics in antenna radiation are formed by weighting phase components.

  In this CDMA mobile communication system, switching (handoff) of a base station to be connected to a radio line is performed as the mobile radio terminal moves. In this case, before the mobile radio terminal switches communication from the handoff source base station to the handoff destination base station, communication can be performed simultaneously with the two base stations. However, since the base station of the handoff destination does not know the direction of the mobile radio terminal, it is impossible to form a sharp directivity (a beam pattern with a small half-angle value) toward the mobile radio terminal from the beginning. For this reason, since the handoff destination base station takes a method such as starting communication on the downlink for all directions, there is a problem that highly efficient communication cannot be performed from the initial stage of communication.

  Therefore, based on the installation position information of each base station of the handoff and the base station of the handoff and the directivity control information of the uplink of the base station of the handoff, the base station of the handoff There is already a mobile communication system that improves the communication quality of the uplink of the handoff destination base station at the time of handoff activation by determining the initial directivity control parameter of the uplink and forming the initial directivity in advance. It has been proposed (see, for example, Patent Document 1).

  In addition, a cellular phone that can be connected to either a cellular wireless network or a wireless local area network (LAN), a backbone network to which an information server is connected, and a first gateway connected to the backbone network via a first gateway. A mobile phone company base station connected to the first subnet, a second subnet connected to the backbone network via a second gateway, and a radio connected to the second subnet In a wireless communication system equipped with an access point of a LAN operator, when the mobile phone is located outside the communication range of the access point, the directivity of the access point is controlled so that the mobile phone can communicate with the access point. Connect your mobile phone to a wireless LAN without moving your points It is known also wear a mobile communication system (e.g., see Patent Document 2).

JP 2000-244386 A JP 2005-026857 A

  Here, the mobile communication system can be roughly divided into a cellular radio network and a radio local area network (wireless LAN). The cellular radio network is a CDMA mobile communication system described in Patent Document 1 described above, in which a service area is divided into a plurality of cells, and a radio base station is arranged at the center of each cell. Is connected to the upper station. This mobile radio terminal can move while communicating with the nearest radio base station and further communicating with a partner terminal connected to the public network via a host station, and moves from one cell to another. In this case, the above-described handover is performed and communication is continued.

  On the other hand, a wireless LAN is a system in which a mobile wireless terminal can wirelessly communicate with a wireless LAN base station according to a protocol such as 802.11 of the Institute of Electrical and Electronics Engineers (IEEE). A wireless LAN is more suitable for large-capacity data transmission than a cellular wireless network. When a mobile wireless terminal moves between two different wireless networks such as a cellular wireless network and a wireless LAN, the mobile wireless terminal switches communication between wireless base stations of different wireless networks and continues communication. You need to be able to roam.

  In the mobile communication system described in Patent Document 1, when a mobile radio terminal moves from one cell to another cell in the same cellular radio network, the installation position information of the base station in one cell and the destination cell of another cell Since the base station installation position information is known, the handoff destination base station can estimate the direction of the mobile radio terminal from its own station and control its antenna beam.

  However, when the mobile wireless terminal moves from the cellular wireless network to the wireless LAN, the base station in the wireless LAN cannot obtain the installation location information of the base station of the cellular wireless network of the movement source in advance. The base station cannot estimate the direction of the mobile radio terminal and cannot perform highly efficient communication from the initial stage of communication.

  The mobile communication system described in Patent Document 2 controls the directivity of an access point so that a mobile phone that can be connected to either a cellular wireless network or a wireless LAN can communicate with an access point of a wireless LAN operator. Thus, the mobile phone can be connected to the wireless LAN without moving the access point, and after starting communication with the access point, the wireless LAN base station determines the position of the mobile wireless terminal and directs the antenna beam. There is a problem that the configuration of the wireless LAN base station for determining the frequency is relatively complicated.

  The present invention has been made in view of the above points. When a mobile wireless terminal moves from a cellular wireless network to a wireless LAN, communication efficiency between the wireless LAN base station and the mobile wireless terminal is improved. It is an object of the present invention to provide an antenna beam control method, an antenna beam control apparatus, and a mobile communication system that can realize simplification.

  In order to achieve the above object, a first invention is an antenna beam control method for a first radio base station installed in a predetermined first radio network, which is different from the first radio network. When a second wireless base station installed in the wireless network 2 and a mobile wireless terminal are performing wireless communication, a distance and an azimuth angle from the second wireless base station to the mobile wireless terminal are estimated. The first radio base installed in the direction in which the mobile radio terminal moves based on the first step, the installation position information of the second radio base station, and the distance and azimuth angle estimated in the first step Based on the second step of acquiring station installation position information, the distance and azimuth angle estimated in the first step, and the first radio base station installation position information acquired in the second step, Mobile radio terminal from 1 radio base station A third step of estimating the distance and the azimuth angle at the first step, and a fourth step of controlling the direction of the antenna beam of the first radio base station based on the distance and the azimuth angle estimated in the third step It is characterized by including.

  In order to achieve the above object, a second invention is an antenna beam control apparatus for a first radio base station installed in a predetermined first radio network, which is a first radio network. Estimating the distance and azimuth from the second radio base station to the mobile radio terminal when the second radio base station and the mobile radio terminal installed in different second radio networks are in radio communication Based on the first estimation means, the installation position information of the second radio base station, and the distance and the azimuth angle estimated by the first estimation means. Installation position information acquisition means for acquiring the installation position information of the wireless base station, distance and azimuth angle estimated by the first estimation means, and installation position information of the first radio base station acquired by the installation position information acquisition means Based on the first radio base station Controlling the direction of the antenna beam of the first radio base station based on the second estimation means for estimating the distance to the mobile radio terminal and the azimuth angle, and the distance and azimuth angle estimated by the third estimation means And antenna beam direction control means.

Furthermore, in order to achieve the above object, the third invention provides a first radio base station installed in a predetermined first radio network by roaming and a second radio different from the first radio network. A mobile communication system in which any one of second radio base stations installed in a network and a mobile radio terminal perform radio communication,
The second radio base station includes first estimation means for estimating a distance and an azimuth angle from the mobile station to the mobile radio terminal when wirelessly communicating with the mobile radio terminal, and installation position information of the mobile station. And, based on the distance and azimuth estimated by the first estimation means, installation position information acquisition means for acquiring the installation position information of the first radio base station installed in the direction in which the mobile radio terminal moves; The distance from the first radio base station to the mobile radio terminal based on the distance and azimuth estimated by the first estimation means and the installation position information of the first radio base station acquired by the installation position information acquisition means And a second estimating means for estimating the azimuth and notifying the first radio base station,
The first radio base station has antenna beam direction control means for controlling the direction of the antenna beam of the own station based on the distance and the azimuth angle notified from the second radio base station. To do.

  ADVANTAGE OF THE INVENTION According to this invention, while a wireless LAN base station can communicate efficiently with the mobile wireless terminal which was communicating with the mobile wireless base station until now from the initial stage of communication, a wireless LAN base station is a mobile wireless terminal. By obtaining the position information from the mobile radio base station, it is possible to eliminate the function of determining the position by itself and determining the direction in which the antenna beam is directed, and to simplify the configuration.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration diagram of an embodiment of a mobile communication system according to the present invention. As shown in FIG. 1, the mobile communication system of this embodiment includes a wireless LAN base station 1, a mobile radio base station 3, a mobile radio terminal 5, and a database device 9.

  The wireless LAN base station 1 is one wireless base station in the wireless LAN, and performs wireless communication 11 with the mobile wireless terminal 5 within the communication range 2 of the wireless LAN base station 1. The mobile radio base station 3 is one radio base station in the cellular radio network, and performs radio communication 10 with the mobile radio terminal 5 within the communication range 4 of the mobile radio base station 3.

  In addition, the mobile radio base station 3 communicates the wireless LAN base station position information 7 and the mobile radio base station position information 8 with the database device 9 by wire, and the mobile radio terminal station 1 communicates with the wireless LAN base station 1. Information 6 is communicated by wire. The wireless LAN base station 1 performs wireless communication 11 from the wireless LAN base station 1 to the mobile wireless terminal 5 with the antenna beam directed toward the mobile wireless terminal 5 in accordance with the mobile wireless terminal position information 6. In the database device 9, installation position information of the wireless LAN base station 1 is registered in advance.

  According to the present embodiment, with such a configuration, the wireless LAN base station 1 can direct the antenna beam to the mobile radio terminal 5 before starting communication with the mobile radio terminal 5, and the antenna beam direction during communication. Correction is performed.

  Next, the operation of the present embodiment using the position information of mobile radio, that is, the antenna beam control method of the wireless LAN base station will be described with reference to the configuration diagram of FIG. 1 and the flowchart of FIG. If the mobile radio terminal 5 is located within the communication range 4 of the mobile radio base station 3 but is not located within the communication range 2 of the wireless LAN base station 1, the mobile radio base station 3 Radio communication 10 is performed with the mobile radio terminal 5 to estimate the distance and azimuth from the mobile radio base station 3 to the mobile radio terminal 5 (step S1). This estimation method is well known to those skilled in the art in a mobile communication system with a general mobile radio base station 3 and a mobile radio terminal 5, and since it is not directly related to the present invention, its detailed configuration is omitted. To do.

  Next, the mobile radio base station 3 notifies the database apparatus 9 of the installation position of the mobile radio base station 3 as mobile radio base station position information 8 (step S2). The installation position information of the mobile radio base station 3 is registered in the mobile radio base station 3 itself at the time of installation, or a GPS signal is received by a GPS (Global Positioning System) receiver of the mobile radio base station 3 and publicly known. Get in the way.

  In the database device 9, installation position information of the wireless LAN base station 1 is registered in advance. The database device 9 is installed around the mobile radio base station 3 from among a plurality of installed wireless LAN base stations using the mobile radio base station position information 8 notified from the mobile radio base station 3. The wireless LAN base station 1 is selected (step S3). Subsequently, the database device 9 notifies the mobile radio base station 3 of the installation position information of the selected wireless LAN base station 1 as the wireless LAN base station position information 7 (step S4).

  The mobile radio base station 3 uses the wireless LAN base station position information 7 notified from the database device 9 and the distance and azimuth angle estimation information from the mobile radio base station 3 to the mobile radio terminal 5 estimated in step S1. The distance from the wireless LAN base station 1 to the mobile wireless terminal 5 and the azimuth angle are estimated and notified to the wireless LAN base station 1 as mobile wireless terminal position information 6 (step S5).

  The estimation of the mobile radio terminal location information 6 in step S5 is performed as follows. The mobile radio base station 3 first estimates the distance and azimuth from the mobile radio base station 3 to the wireless LAN base station 1 using the installation location information of the own device and the installation location information of the wireless LAN base station 1. . Then, the distance and azimuth angle from the wireless LAN base station 1 to the mobile radio terminal 5 are estimated using the distance and azimuth information from the mobile radio base station 3 to the mobile radio terminal 5.

  Further, by estimating the information of the antenna height of the mobile radio base station 3 and the antenna height of the radio LAN base station 1 together with the distance and the azimuth angle, the mobile radio base station 1 moves to the mobile radio terminal. It is also possible to estimate the distance up to 5, the azimuth angle, and the depression angle.

  Next, the wireless LAN base station 1 directs the antenna beam toward the mobile wireless terminal 5 whose distance and azimuth are estimated according to the mobile wireless terminal position information 6 notified from the mobile wireless base station 3 (step S6). ). With this operation, the wireless LAN base station 1 can direct the antenna beam toward the mobile radio terminal 5 before starting communication with the mobile radio terminal 5. Thereafter, the wireless communication 11 is started with the mobile wireless terminal 5 when the mobile wireless terminal 5 enters the communication range 2 of the wireless LAN base station 1.

  As described above, according to the present embodiment, before the wireless LAN base station 1 starts communication with the mobile radio terminal 5, the position of the mobile radio terminal 5 can be known and the direction in which the antenna beam is directed can be determined. Thus, highly efficient communication is possible from the initial stage of wireless communication between the wireless LAN base station 1 and the mobile wireless terminal 5.

  Further, according to the present embodiment, after the start of wireless communication between the wireless LAN base station 1 and the mobile wireless terminal 5, the wireless LAN base station 1 obtains the position information of the mobile wireless terminal 5 from the mobile wireless base station 3. Therefore, the function of determining the position of the antenna beam by determining the position by itself is unnecessary, and the configuration of the wireless LAN base station 1 can be simplified.

  Note that by adding a function of notifying the mobile radio terminal 5 of the information estimated by the mobile radio base station 3, the mobile radio terminal 5 transmits an antenna to the radio LAN base station 1 before starting communication with the radio LAN base station 1. It is also possible to direct the beam. Further, during communication between the wireless LAN base station 1 and the mobile wireless terminal 5, this operation is performed to sequentially estimate the distance and azimuth angle from the wireless LAN base station 1 to the mobile wireless terminal 5, so that the wireless LAN base station It is also possible to correct the antenna beam direction of 1 and / or the mobile radio terminal 5.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, a method for performing estimation by the mobile radio base station 3 is described. Thus, the database device 9 can also estimate the distance, azimuth angle, and depression angle from the wireless LAN base station 1 to the mobile wireless terminal 5.

It is a block diagram of one Example of the mobile communication system of this invention. It is a flowchart of one Example of the antenna beam control method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless LAN base station 2 Wireless LAN base station communication range 3 Mobile wireless base station 4 Mobile wireless base station communication range 5 Mobile wireless terminal 6 Mobile wireless terminal location information 7 Wireless LAN base station location information 8 Mobile wireless base station location information 9 Database device

Claims (21)

An antenna beam control method for a first radio base station installed in a predetermined first radio network, comprising:
When a second radio base station installed in a second radio network different from the first radio network is in radio communication with a mobile radio terminal, the second radio base station sends the mobile radio A first step of estimating a distance to the terminal and an azimuth;
The first radio base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the second radio base station and the distance and azimuth angle estimated in the first step A second step of obtaining the installation position information of
Based on the distance and azimuth angle estimated in the first step and the installation position information of the first radio base station acquired in the second step, the mobile radio from the first radio base station A third step of estimating the distance to the terminal and the azimuth;
And a fourth step of controlling the direction of the antenna beam of the first radio base station based on the distance and the azimuth angle estimated in the third step. An antenna beam control method for a wireless LAN base station installed in a wireless LAN network,
A first step of estimating a distance and an azimuth angle from the mobile radio base station to the mobile radio terminal when the mobile radio base station and the mobile radio terminal installed in the cellular radio network are in radio communication; When,
Installation position information of the wireless LAN base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the mobile radio base station and the distance and azimuth angle estimated in the first step A second step of obtaining
The distance from the wireless LAN base station to the mobile wireless terminal based on the distance and azimuth angle estimated in the first step and the installation position information of the wireless LAN base station acquired in the second step And a third step of estimating the azimuth angle;
Based on the distance and the azimuth angle estimated in the third step, the wireless LAN base station moves toward the mobile wireless terminal when the mobile wireless terminal enters the communication range of the wireless LAN base station. And a fourth step of controlling the direction of the antenna beam.   The second step is a notification step of notifying the installation position information of the mobile radio base station to a database device in which the installation position information of each of the wireless LAN base stations installed in the wireless LAN network is stored in advance. Based on the notified installation position information of the mobile radio base station from the wireless LAN base stations whose installation position information is stored in the database device, the radio installed around the mobile radio base station An antenna beam control method according to claim 2, further comprising an acquisition step of acquiring installation position information of the LAN base station.   In the third step, from the mobile radio base station to the wireless LAN base station using the mobile radio base station installation position information and the wireless LAN base station installation position information acquired in the second step. A first estimation step for estimating a distance and an azimuth angle up to the distance and an azimuth angle from the mobile radio base station to the wireless LAN base station estimated in the first estimation step. A second estimation step of estimating the distance and azimuth from the wireless LAN base station to the mobile radio terminal using the distance and azimuth from the mobile radio base station estimated in step The antenna beam control method according to claim 2 or 3, wherein   5. The method according to claim 2, further comprising a fifth step of starting communication between the wireless LAN base station and the mobile wireless terminal after performing the antenna beam control in the fourth step. The antenna beam control method according to claim 1.   A notification step of notifying the mobile radio terminal of the distance and azimuth angle from the wireless LAN base station estimated in the third step to the mobile radio terminal; and the distance and azimuth angle notified in the notification step; The antenna beam according to any one of claims 2 to 5, further comprising a beam direction control step of directing an antenna beam direction of the mobile radio terminal toward the wireless LAN base station based on Control method. During communication between the wireless LAN base station and the mobile wireless terminal, the mobile wireless terminal estimates the distance and azimuth from the mobile wireless base station in the communication range to the mobile wireless terminal. And the steps
Installation position information of the wireless LAN base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the mobile radio base station and the distance and azimuth angle estimated in the sixth step A seventh step of obtaining
The distance from the wireless LAN base station to the mobile wireless terminal based on the distance and azimuth angle estimated in the sixth step and the installation position information of the wireless LAN base station acquired in the seventh step And an eighth step of estimating the azimuth angle;
And a ninth step of correcting the direction of the antenna beam of the wireless LAN base station to the direction of the mobile wireless terminal based on the distance and the azimuth angle estimated in the eighth step. The antenna beam control method according to any one of claims 2 to 6. An antenna beam control device for a first radio base station installed in a predetermined first radio network,
When a second radio base station installed in a second radio network different from the first radio network is in radio communication with a mobile radio terminal, the second radio base station sends the mobile radio First estimating means for estimating the distance to the terminal and the azimuth;
The first radio base installed in the direction in which the mobile radio terminal moves based on the installation position information of the second radio base station and the distance and azimuth angle estimated by the first estimation means Installation location information acquisition means for acquiring the installation location information of the station;
From the first radio base station based on the distance and azimuth angle estimated by the first estimation means and the installation position information of the first radio base station acquired by the installation position information acquisition means A second estimating means for estimating a distance to the mobile radio terminal and an azimuth angle;
Antenna beam direction control means for controlling the direction of the antenna beam of the first radio base station based on the distance and azimuth angle estimated by the third estimation means. apparatus. An antenna beam control device for a wireless LAN base station installed in a wireless LAN network,
First estimation for estimating a distance and an azimuth from the mobile radio base station to the mobile radio terminal when the mobile radio base station installed in the cellular radio network and the mobile radio terminal are performing radio communication Means,
The installation position of the wireless LAN base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the mobile radio base station and the distance and azimuth angle estimated by the first estimation means Installation position information acquisition means for acquiring information;
From the wireless LAN base station to the mobile wireless terminal based on the distance and azimuth estimated by the first estimating means and the installation position information of the wireless LAN base station acquired by the installation position information acquisition means Second estimation means for estimating the distance and azimuth of
Based on the distance and the azimuth angle estimated by the second estimating means, the wireless LAN base station moves toward the mobile wireless terminal when the mobile wireless terminal enters the communication range of the wireless LAN base station. And an antenna beam direction control means for controlling the direction of the antenna beam. The installation position information acquisition means includes
A database device in which installation location information of each wireless LAN base station installed in the wireless LAN network is stored;
Notifying means for notifying the database device of the location information of the mobile radio base station;
Based on the notified installation position information of the mobile radio base station from the wireless LAN base stations whose installation position information is stored in the database device, the radio installed around the mobile radio base station 10. The antenna beam control device according to claim 9, further comprising information acquisition means for acquiring installation position information of the LAN base station. The second estimating means includes
Using the installation position information of the mobile radio base station and the installation position information of the wireless LAN base station acquired by the installation position information acquisition means, a distance and an azimuth angle from the mobile radio base station to the wireless LAN base station First distance and azimuth angle estimating means for estimating
Using the distance and azimuth angle from the mobile radio base station estimated by the first estimation means to the distance and azimuth angle estimated by the first distance and azimuth angle estimation means, The antenna beam control device according to claim 9 or 10, comprising: a second distance and azimuth angle estimation means for estimating a distance and an azimuth angle from a wireless LAN base station to the mobile radio terminal.   The communication apparatus further comprises communication start means for starting communication between the wireless LAN base station and the mobile radio terminal after the antenna beam direction control means controls the antenna beam. 11. The antenna beam control device according to claim 11. Distance and azimuth angle notifying means for notifying the mobile radio terminal of the distance and azimuth angle from the wireless LAN base station estimated by the second estimation means to the mobile radio terminal;
Beam direction control means for directing the direction of the antenna beam of the mobile radio terminal toward the direction of the wireless LAN base station based on the distance and the azimuth angle notified by the distance and the notification means The antenna beam control device according to any one of claims 9 to 12. During communication between the wireless LAN base station and the mobile wireless terminal, the mobile wireless terminal estimates the distance and azimuth from the mobile wireless base station in the communication range to the mobile wireless terminal. Means for estimating
The installation position of the wireless LAN base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the mobile radio base station and the distance and azimuth angle estimated by the third estimation means Wireless LAN base station installation position information acquisition means for acquiring information;
Based on the distance and azimuth angle estimated by the third estimating means and the acquired installation position information of the wireless LAN base station, the distance and azimuth angle from the wireless LAN base station to the mobile wireless terminal are obtained. A fourth estimating means for estimating;
Correction means for correcting the direction of the antenna beam of the wireless LAN base station to the direction of the mobile wireless terminal based on the distance and the azimuth angle estimated by the fourth estimation means. The antenna beam control device according to any one of claims 9 to 13. Of the first radio base station installed in a predetermined first radio network by roaming and the second radio base station installed in a second radio network different from the first radio network A mobile communication system in which any one and a mobile radio terminal perform radio communication,
The second radio base station is
First estimation means for estimating a distance and an azimuth from the mobile station to the mobile radio terminal when wirelessly communicating with the mobile radio terminal;
Installation position information of the first radio base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the own station and the distance and azimuth angle estimated by the first estimation means Installation position information acquisition means for acquiring
From the first radio base station based on the distance and azimuth angle estimated by the first estimation means and the installation position information of the first radio base station acquired by the installation position information acquisition means Second estimating means for estimating a distance to a mobile radio terminal and an azimuth angle and notifying the first radio base station;
The first radio base station has
A mobile communication system comprising antenna beam direction control means for controlling the direction of the antenna beam of the local station based on the distance and azimuth angle notified from the second radio base station. A mobile communication system in which one of a wireless LAN base station installed in a wireless LAN network by roaming and a mobile wireless base station installed in a cellular wireless network communicates with a mobile wireless terminal. ,
The mobile radio base station is
First estimation means for estimating a distance and an azimuth from the mobile station to the mobile radio terminal when wirelessly communicating with the mobile radio terminal;
Based on the installation position information of the own station and the distance and azimuth angle estimated by the first estimation means, the installation position information of the wireless LAN base station installed in the direction in which the mobile wireless terminal moves is obtained. Installation position information acquisition means to perform,
From the wireless LAN base station to the mobile wireless terminal based on the distance and azimuth estimated by the first estimating means and the installation position information of the wireless LAN base station acquired by the installation position information acquisition means Second estimation means for estimating and notifying the wireless LAN base station of the distance and azimuth of the wireless LAN base station,
Based on the distance and azimuth angle notified from the mobile radio base station, the direction of the antenna beam of the mobile station is set in the direction of the mobile radio terminal when the mobile radio terminal enters the communication range of the mobile station. A mobile communication system comprising antenna beam direction control means for controlling. A database device in which installation location information of each wireless LAN base station installed in the wireless LAN network is stored in advance;
The installation position information acquisition means includes
Notifying means for notifying the database device of the location information of the mobile radio base station;
Based on the notified installation position information of the mobile radio base station from the wireless LAN base stations whose installation position information is stored in the database device, the radio installed around the mobile radio base station The mobile communication system according to claim 16, further comprising information acquisition means for acquiring installation position information of the LAN base station. The second estimating means includes
Using the installation position information of the mobile radio base station and the installation position information of the wireless LAN base station acquired by the installation position information acquisition means, a distance and an azimuth angle from the mobile radio base station to the wireless LAN base station First distance and azimuth angle estimating means for estimating
Using the distance and azimuth angle from the mobile radio base station estimated by the first estimation means to the distance and azimuth angle estimated by the first distance and azimuth angle estimation means, The mobile communication system according to claim 16 or 17, comprising a second distance and azimuth angle estimating means for estimating a distance and an azimuth angle from a wireless LAN base station to the mobile radio terminal.   The wireless LAN base station further comprises communication start means for starting communication between the mobile station and the mobile station after controlling the antenna beam by the antenna beam direction control means. The mobile communication system according to any one of claims 16 to 18. The mobile radio base station further has distance and azimuth angle notifying means for notifying the mobile radio terminal of the distance and azimuth angle from the wireless LAN base station to the mobile radio terminal estimated by the second estimation means. And
The mobile radio terminal has beam direction control means for directing the direction of the antenna beam of the mobile terminal toward the direction of the wireless LAN base station based on the distance and the azimuth angle notified by the distance and notification means. The mobile communication system according to any one of claims 16 to 19. The mobile radio base station is
Third estimation for estimating a distance and an azimuth angle from a local station where the mobile wireless terminal is within a communication range to the mobile wireless terminal during communication between the wireless LAN base station and the mobile wireless terminal Means,
The installation position of the wireless LAN base station installed in the direction in which the mobile radio terminal moves based on the installation position information of the mobile radio base station and the distance and azimuth angle estimated by the third estimation means Wireless LAN base station installation position information acquisition means for acquiring information;
Based on the distance and azimuth angle estimated by the third estimating means and the acquired installation position information of the wireless LAN base station, the distance and azimuth angle from the wireless LAN base station to the mobile wireless terminal are obtained. A fourth estimating means for estimating, wherein the wireless LAN base station
Correction means for receiving the distance and azimuth angle estimated by the fourth estimation means as input, and correcting the direction of the antenna beam of the own station to the direction of the mobile radio terminal based on the distance and azimuth angle The mobile communication system according to any one of claims 16 to 20, further comprising:

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