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Multi-access mobile devices and overlapping wireless network deployments have emerged as a next generation network fixture. Mobile devices should be capable of handing over between heterogeneous networks seamlessly and automatically. On the other side, the Voice-over-IP protocol (VoIP) and video has attracted a great deal of attention in the field of wireless mobile networks. In this paper, the authors study the vertical handover latency of voice packet transmissions and video traffic during the vertical handovers between UMTS (HSPA), WiMAX (IEEE 802.16) and WLAN (IEEE 802.11) networks. Furthermore, they analyze throughput and packet loss results during VHOs between UMTS and WiMAX considering the effects of DCD/UCD interval, and detect the best values for this parameter.
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