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Effects of Packet Lossless Recovery Scheme on Buffer Size for Mobile VoIP Handoff

The integration of Mobile IP standard and VoIP functions makes the Mobile Voice over IP (Mobile VoIP) service feasible. In Mobile VoIP applications, the mobile users can dynamically move around different networks, and thus result in handoffs. Handoffs will introduce packets loss, and thus significantly drop the quality of service (QoS). To support the QoS, we propose in this paper a two-buffer packet lossless retransmission recovery scheme for Mobile VoIP handoff duration. For realizing the effects of handoff time on backup buffer overhead, we perform several realistic experiments with various wireless parameters, such as different AP (Access Point) signaling strengths, different traffic loads, different advertisement frequencies, and different number of mobile users. The experimental results show that, with our packet recovery scheme, the designated backup buffer size in general ranges from 7 to 10 Kilo Bytes. We thus conclude that our two-buffer recovery scheme is practical for current Mobile VoIP services.