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1. (WO2017040075) SUPPORT OF DOWNLINK POSITIONING USING COHERENT AND NON-COHERENT SIGNAL ACQUISITION

Pub. No.:    WO/2017/040075    International Application No.:    PCT/US2016/047925
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sun Aug 21 01:59:59 CEST 2016
IPC: H04L 5/00
H04L 27/26
G01S 5/10
H04W 64/00
Applicants: QUALCOMM INCORPORATED
Inventors: EDGE, Stephen William
OPSHAUG, Guttorm
FISCHER, Sven
Title: SUPPORT OF DOWNLINK POSITIONING USING COHERENT AND NON-COHERENT SIGNAL ACQUISITION
Abstract:
Techniques are discussed for conveying frequency error characteristics for a plurality of cell transceivers from a server to a mobile device to enable the mobile device to determine an optimum or near optimum period of coherent integration of a downlink signal from one or more of the plurality of cell transceivers based on the frequency error characteristics. The coherent integration of the downlink signal may be to support a downlink terrestrial positioning method such as the Observed Time Difference of Arrival (OTDOA) method for Long Term Evolution (LTE) and the downlink signal may be a Positioning Reference Signal (PRS). A mobile device may perform downlink signal integration for longer periods than the optimum period for coherent integration by combining coherent integration results using non-coherent integration. The optimum period may achieve maximum or near maximum signal to noise ratio.