Achieving VoIP Guarantee in Wireless Local Area Networks
Recently, Voice over Internet Protocol (VoIP) has gained much attention in Wireless Local Area Networks (WLANs). Although IEEE 802.11e Enhanced Distributed Channel Access (EDCA) has been standardized to provide voice traffic with Quality of Service (QoS) support, the voice quality could still be severely degraded by the traffic transmitted from Low-Priority STAtions (LP-STAs). Like 802.11b, the 802.11e EDCA also has the performance anomaly problem. Therefore, the voice quality of the High-Rate STAtions (HR-STAs) could be severely degraded by the traffic transmitted from Low-Rate STAtions (LR-STAs).