Evaluating QoS of Cell Overlapping in 3G VoIP

Abstract

One important goal of mobile communication systems is to provide services to users at acceptable Quality of Services. Cell overlapping is a result of introducing small cells in an area while maintaining the original layer of large cells. In this research, We investigate the quality improvement on VoIP calls introduced by cell overlapping. We use OPNET to simulate an overlapped cell environment and evaluate QoS parameters without cell overlapping and compare that when cell overlapping is employed. The results show that cell of overlapping reduces call drop probability and minimize jitter and delay (overall End-to-End delay, average End-to-End delay, delay variation, packet delay variation).