Wireless VoIP, typically over 802.11 WLAN, is becoming increasingly popular, but even further elevates the challenges of delay and loss reduction. Degradation of speech quality caused by packet delay and loss of voice traffic is still one of critical technical barriers of the VoIP system. Furthermore, apart from these limitations WLANs will need to support a large number of concurrent VoIP communications since VoIP is spreading rapidly especially in public spaces. These motivations lead to study the VoIP capacity in IEEE 802.11e WLAN and to investigate increasing this capacity by reducing VoIP codec rate while maintaining an overall good quality. This paper presents an analytical model for VoIP capacity in IEEE 802.11e WLAN.
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