Mobility

Uplink Versus Downlink Wirless Mobile Positioning in UMTS Cellular Radio Systems

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Executive Summary

A performance comparison between radio Location Positioning (LP) in Wide band Code Division Multiple Access (WCDMA), more precisely in UMTS FDD cellular phones, using the UpLink (UL) and Downlink (DL) scenarios, is carried out. The radio location algorithm using the Time Difference Of Arrival (TDOA) is applied, where the TDOA is the difference between two TOA estimated at two base stations. The authors propose a practical algorithm to obtain high precision PL under high level interference.

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