EP 1005773 A1 20000607 - LOCATION SYSTEM FOR DIGITAL MOBILE TELEPHONY
Title (en)
LOCATION SYSTEM FOR DIGITAL MOBILE TELEPHONY
Title (de)
LOKALIESIERUNGSSYSTEM FÜR DIGITALES MOBILES TELEFONGERÄT
Title (fr)
SYSTEME DE LOCALISATION EN TELEPHONIE MOBILE NUMERIQUE
Publication
Application
Priority
- GB 9802538 W 19980824
- GB 9717844 A 19970823
Abstract (en)
[origin: WO9911086A1] A digital cellular radio communication network, for example, a GSM or CDMA network, including a plurality of mobile stations; a number of base stations (BSs), each one of which is adapted to communicate with a number of mobile stations and has a known fixed geographic location in the network; and location means for determining the geographic location of a mobile station in the network. The location means includes at least one reference mobile station having a known geographic location in the network and which is adapted to receive signals broadcast by said base stations, and the received signals are used to determine the geographic location of a subscriber mobile station in the network. A mobile station includes means adapted to (a) identify, and measure the time of arrival of, the earliest arriving copy of a signal broadcast by a base station and received as a composite of plural copies, the time of arrival being measured relative to an internal time base of said mobile station, and (b) determine the relative timings of signals broadcast by a number of base stations. The relative timings of the signals are used to determine the geographic location of the mobile station in the network. The signals may be broadcast on a BCCH of each of the base stations, a BCCH signal conveying to a mobile station information concerning the broadcasting base station and the digital cellular radio communication network.
IPC 1-7
IPC 8 full level
G01S 5/02 (2006.01); G01S 5/10 (2006.01); H04Q 7/34 (2006.01); H04Q 7/38 (2006.01); H04W 64/00 (2009.01)
CPC (source: EP US)
G01S 5/021 (2013.01 - EP); G01S 5/0218 (2020.05 - EP US); G01S 5/0221 (2013.01 - EP US); G01S 5/10 (2013.01 - EP); H04W 64/00 (2013.01 - EP)
Citation (search report)
See references of WO 9911086A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 9911086 A1 19990304; AU 8870798 A 19990316; EP 1005773 A1 20000607; GB 9717844 D0 19971029; JP 2001514476 A 20010911
DOCDB simple family (application)
GB 9802538 W 19980824; AU 8870798 A 19980824; EP 98940367 A 19980824; GB 9717844 A 19970823; JP 2000508213 A 19980824