Optimizing location positioning using hybrid TOA-AOA techniques in mobile cellular networks

Authors:
Nikos Deligiannis;Spiros Louvros;Stavros Kotsopoulos
Affiliations:
University of Patras, Rion, Patras, Hellas;Technological Education Institute of Mesologgi, Nafpactos, Hellas;University of Patras, Rion, Patras, Hellas
Venue:
Proceedings of the 3rd international conference on Mobile multimedia communications
Year:
2007

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Abstract

Mobile Positioning is a great aspect in mobile cellular networks (GSM, UMTS etc) as it makes it possible to introduce a new class of applications based on the knowledge of the subscriber's position. Therefore, it can be quite useful for the support of multimedia streaming application's performance. Although several complicated techniques have been introduced, the need for implementation simplicity holds interest for conventional techniques such as Time of Arrivals (TOA) and Angle of Arrivals (AOA). In this paper we introduce two enhanced versions of the latter techniques, Enhanced Time of Arrivals (E-TOA) and Enhanced Angle of Arrival (E-AOA), in order to optimize the location positioning estimations. The accuracy is improved by introducing additional weight coefficients reflecting the LOS/nLOS propagation. Finally, the resulting cost functions are simulated in three 2-D, single ray trace microcellular simulation environments and compared to existing techniques. The results have shown good reduction of the location error which in urban environment reaches the value of 40%.