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In this paper we experimentally study the relationship between bandwidth utilization in the wireless LAN and the quality of VoIP calls transmitted over the wireless medium. Specifically we evaluate how the amount of free bandwidth decreases as the number of calls increases and how this influences transmission impairments (i.e. delay, loss and jitter) and thus degrades call quality. We show that the amount of free bandwidth is a good indicator for predicting VoIP call quality.
Narbutt, M. & Davis, M. (2006) Effect of free bandwidth on VoIP performance in 802.11b WLAN networks. IEE Irish Signals and Systems Conference 2006 (ISSC 2006), Dublin, Ireland, June, 2006.