Simulation model and location accuracy for observed time difference of arrival (OTDOA) positioning technique in Third Generation system

In the Third Generation (3G), Location Based Service (LBS) is an important feature of radio networks and plays a significant role in mobile communication. In this paper, detailed analysis is focused on the LDT based on Observed Time Difference of Arrival (OTDOA) positioning technique in 3G system. These positioning methods were chosen as they refer to the three hearability from at least three Node Bs. A simulation model for OTDOA based on the path loss model has been developed and is used to simulate data with fixed input parameters and the RSCP of Node Bs from field drive test. The data collected is from the vicinity of urban areas in Kuala Lumpur. We then analyze and evaluate the location accuracy by using OTDOA techniques with three different path loss models such as Fixing Algorithm, COST231-Okumura-Hata and COST231-Walfisch-Ikegami. Then, the performance of these OTDOA techniques based on the three path loss models is discussed and compared according to the accuracy of location approximation. From the analysis we find out which OTDOA techniques with COST231-Walfisch-Ikegami path loss model has the most accuracy of location approximation with the least location error.