Using dynamic PCF to improve the capacity for VoIP traffic in IEEE 802.11 networks

With the deployment of IEEE 802.11 networks, supporting real-time traffic with stringent quality of service (QoS) requirements on these networks becomes a critical issue. We propose two new media access schemes, namely dynamic point coordination function (DPCF) and modified DPCF (DPCF2). These can improve the capacity for voice-over-IP (VoIP) traffic by up to 20% in IEEE 802.11b networks. We show how we can also achieve a drastic improvement in the end-to-end delay with mixed VoIP and data traffic. Delay is kept around 100 ms in heavily loaded traffic conditions with an average value under 60 ms in normal traffic conditions.