Assessment of Uplink Time Difference Of Arrival (U-TDOA) Position Location Method in Urban Area and Highway in Mosul City_ENG

Yehia R Hamdy,Dr Sami A Mawjoud

doi:10.33899/rengj.2013.72854

Abstract

The aim of this paper is the assessment of the performance of U-TDOA Position Location (PL) method on a UMTS cellular system in Mosul city, Iraq. The study area is a (3×3 km) which covers the University of Mosul campus. Simulation is used to study and evaluate the performance of U-TDOA PL method in urban area and on a highway inside the city. The effect of terrain, multipath, signal to noise ratio (SNR), Geometric Dilution Of Precision (GDOP), shadowing and the configuration of base stations on the positioning accuracy are investigated. The study is conducted on a real coordinates with the distribution of UMTS BSs as the same existing 2.5 Generation Enhanced Data rates for GSM Evolution (EDGE)Asiacell operator. Keywords: U-TDOA, Position Location, UMTS.

Highlights

The U-TDOA positioning method depends on Time Difference Of Arrival (TDOA) measurements
The average Root Mean Square (RMS) error for urban area is 51.69 meter which is acceptable value for positioning location methods specified by Federal Communication Commission (FCC) which is 100 meter error for emergency cases
This geometry is known as the Geometric Dilution of Precision (GDOP)

Summary

Introduction

The U-TDOA positioning method depends on Time Difference Of Arrival (TDOA) measurements. The (Uplink) is used for referencing the Uplink channel and distinct it from Observed Time Difference Of Arrival (OTDOA) method, which works on the Downlink channel and depends on (TDOA) measurements. OTDOA is the earliest version standardized by 3GPP for 3G (UMTS) by the end of the nineties through release99 This method works on Downlink channel and requires modification in both the infrastructure and handset, which require replacement of the legacy handset since the positioning calculation are done in the handset [2]. Another problem of this method is the hearability issue which is related to the closed loop power control that keeps the received power at the minimum required for the connection, and makes the handset unable to listen to other faraway base stations participating in the positioning process [3]

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Results

Conclusion