Balancing uplink and downlink delay of VoIP traffic in WLANs using Adaptive Priority Control (APC)

Authors:
Sangho Shin;Henning Schulzrinne
Affiliations:
Columbia University, New York;Columbia University, New York
Venue:
QShine '06 Proceedings of the 3rd international conference on Quality of service in heterogeneous wired/wireless networks
Year:
2006

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Abstract

In IEEE 802.11 wireless networks, the downlink delay rises as the number of VoIP nodes increases while the uplink delay remains small due to the same chance of media access between nodes and the Access Point (AP). This degrades the capacity and QoS of VoIP significantly. Therefore, we introduce Adaptive Priority Control (APC) to balance the downlink and uplink delay of VoIP traffic at the MAC layer, by giving to the AP a higher transmission priority, which is adaptively decided according to the uplink and downlink traffic volume. And, we verify through theoretical analysis that APC is an optimal method to balance the uplink and downlink delay.