METHOD FOR DETECTING LOCATION OF A MOBILE TERMINAL

WIPO Patent Application WO2003023443

A3

An object of the invention is to determine the location of a mobile terminal as a maximum likelihood estimate value, in a mobile communications system comprising a plurality of base stations, at least one mobile terminal capable of communicating with the base stations, and a center station capable of communicating with the base stations and/or mobile terminal. The probability distribution indicating the variation in the reception level from respective base stations CSi at a plurality of points within a prescribed range in which the mobile terminal has a possibility of being present is determined for these points on the basis of a base station database storing, at the least, positional information for the respective base stations CSi. A likelihood corresponding to the aforementioned probability distribution is determined with respect to the reception level values GAMMA o from the base stations CSi (i = 1 to N) measured by the mobile station, and the point having the greatest likelihood value is determined to be the estimated location of the mobile terminal. Selected drawing Fig. 4

HATTORI TAKESHI (JP)
KOSHIMA HIROAKI (JP)
MUYA KIMIO (JP)

PCT/JP2002/009117

July 31, 2003

September 06, 2002

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LOCUS CORP (JP)
HATTORI TAKESHI (JP)
KOSHIMA HIROAKI (JP)
MUYA KIMIO (JP)

G01S5/02; (IPC1-7): G01S5/02

US5293642A	1994-03-08
US6275190B1	2001-08-14

YAMAMOTO R ET AL: "POSITION LOCATION TECHNOLOGIES USING SIGNAL STRENGTH IN CELLULAR SYSTEMS", VTC 2001 SPRING. IEEE VTS 53RD. VEHICULAR TECHNOLOGY CONFERENCE. RHODES, GREECE, MAY 6 - 9, 2001, IEEE VEHICULAR TECHNOLGY CONFERENCE, NEW YORK, NY: IEEE, US, vol. 4 OF 4. CONF. 53, 6 May 2001 (2001-05-06), pages 2570 - 2574, XP001076223, ISBN: 0-7803-6728-6

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