International Association of Engineers
Simulation of VoIP (Voice over Internet Protocol) traffic through UMTS (Universal Mobile Telecommunication System) and Wi-Fi (IEEE 802.11x) alone and together are analyzed for Quality of Service (QoS) performance. The average jitter of VoIP transiting the Wi-Fi-UMTS network has been found to be lower than that of either solely through the Wi-Fi and the UMTS networks. It is normally expected to be higher than traversing through the Wi-Fi network only. Both the MOS (Mean Opinion Score) and the packet end-to-end delay were also found to be much lower than expected through the heterogeneous Wi-Fi-UMTS network.