A COMMUNICATION SYSTEM, A COMMUNICATION TERMINAL AND A METHOD OF DETERMINING A LOCATION ESTIMATE THEREFOR

Title:

A COMMUNICATION SYSTEM, A COMMUNICATION TERMINAL AND A METHOD OF DETERMINING A LOCATION ESTIMATE THEREFOR

Document Type and Number:

WIPO Patent Application WO2005072362

Kind Code:

A3

Abstract:

A communication system (100) comprises a plurality of location enabled 10 communication terminals (101, 103). The communication terminals (101, 103) comprise a GPS location processor (111) which generates a location estimate in response to signals received from satellite information data and a plurality of satellites (105). The communication terminals (101, 103) also comprise a transceiver (117, 119, 121) which can form ad-hoc communication links with other communication terminals (101, 103). An ad-hoc controller 123 controls the generation and transmission of a request for satellite information data to another communication terminal (101, 103). The transceiver (117, 119, 121) receives satellite information data from the other communication terminal (101, 103) and the location estimate is determined in response thereto. The ad-hoc controller (123) is furthermore operable to detect a request for satellite information data from another communication terminal (101, 103) and to transmit satellite information data over the ad-hoc communication link in response. Hence, satellite information data may be dynamically and opportunistically shared between communication terminals (101, 103).

Inventors:

ALLISON ROBERT J (GB)
CARTER MICHAEL J (GB)
HUNTINGFORD DAVE (GB)
CARPIO RAUL E (GB)

Application Number:

PCT/US2005/002456

Publication Date:

November 03, 2005

Filing Date:

January 25, 2005

Export Citation:

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Assignee:

MOTOROLA INC (US)
ALLISON ROBERT J (GB)
CARTER MICHAEL J (GB)
HUNTINGFORD DAVE (GB)
CARPIO RAUL E (GB)

International Classes:

G01S1/00; G01S5/00; H04B7/00; H04B7/185; H04W8/14; H04W64/00; H04W84/18; (IPC1-7): H04Q7/20; H04B7/00; H04B7/185

Foreign References:

US20040147223A1	2004-07-29
US20030011511A1	2003-01-16
US6885337B2	2005-04-26

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