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In this paper, the authors have conducted experiments to evaluate QoS of VoIP applications over the WiBro network. In order to capture the baseline performance of the WiBro network they measure and analyze the characteristics of delay and throughput under stationary and mobile scenarios. Then they evaluate QoS of VoIP applications using the E - Model of ITU - T G.107. Their measurements show that the achievable maximum throughputs are 5.3 Mbps in downlink and 2 Mbps in uplink. VoIP quality is better than or at least as good as toll quality despite user mobility exceeding the protected limit of WiBro mobility support. Using RAS and sector identification information, they show that the handoff is correlated with throughput and quality degradation.
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