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1. (WO2002032184) METHOD AND APPARATUS FOR MEASURING TIMING OF SIGNALS RECEIVED FROM MULTIPLE BASE STATIONS IN A CDMA COMMUNICATION SYSTEM

Pub. No.:    WO/2002/032184    International Application No.:    PCT/US2001/042573
Publication Date: Apr 18, 2002 International Filing Date: Oct 6, 2001
IPC: G01S 19/46
G01S 19/03
G01S 5/10
H04W 64/00
Applicants: QUALCOMM INCORPORATED
Inventors: GRILLI, Francesco
WILLENEGGER, Serge
Title: METHOD AND APPARATUS FOR MEASURING TIMING OF SIGNALS RECEIVED FROM MULTIPLE BASE STATIONS IN A CDMA COMMUNICATION SYSTEM
Abstract:
Techniques to more accurately measure the arrival times of transmissions received at a remote terminal from a number of base stations. In one aspect, unassigned finger processors are used to process and measure the arrival times of transmissions from base stations not in the active set. In another aspect, if no finger processors are available for assignment, the arrival times can be measured in the time period between updates of a reference oscillator used for the measurements. In accordance with a method for determining a position of a remote terminal, a first set ofone or more base stations in active communication with the remote terminal is identified and each base station in the first set is assigned at least one finger processor. A second set of one or more base stations not in active communication with the remote terminal is also identified and an available finger processor is assigned to each of at least one base station in the second set. A (signal arrival) time measurement is then provided for further processing. To improve accuracy, the measurements can be performed within a narrow time window.