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POSITION ESTIMATION SYSTEM

  • US 20090005083A1
  • Filed: 06/27/2008
  • Published: 01/01/2009
  • Est. Priority Date: 06/27/2007
  • Status: Active Grant
First Claim
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1. A position estimation system comprising:

  • a mobile communication terminal;

    a base station which wirelessly communicates with the mobile communication terminal and which holds its own base station ID that is unique information; and

    a database device which holds an information table having base station information including a latitude, a longitude, a tilt angle, an antenna aperture angle, antenna directivity, and an antenna height of the base station which are associated with the base station ID, wherein the position estimation system estimates a position of the mobile communication terminal located in a radio area of the base station by using the database device,wherein the base station comprises;

    an ID transmission section for sending the base station ID to the database device when the mobile communication terminal requests acquisition of the position; and

    a relay section for relaying information of an estimated latitude and longitude of the mobile communication terminal which is sent from the database device to the mobile communication terminal requesting the acquisition of the position,wherein the database device comprises;

    a calculating section for performing processing for reading the base station information associated with the base station ID from the information table when the base station ID is received, obtaining a latitude and a longitude of a center of a sector that is a gravity center of the sector in the radio area of the base station according to a predetermined calculation using the base station information, and determining the obtained latitude and longitude as the estimated latitude and longitude of the mobile communication terminal; and

    a position transmission section for sending the information of the estimated latitude and longitude of the mobile communication terminal obtained by the calculating section to the relevant base station, andwherein the mobile communication terminal identifies the relayed information of the estimated latitude and longitude of the mobile communication terminal as position information of the latitude and the longitude of the mobile communication terminal.

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