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

Sangho  Shin; Henning  Schulzrinne

3rd International ICST Conference on Quality of Service in Heterogeneous Wired/Wireless Networks

Research Article

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

Cite: BibTeX Plain Text

@INPROCEEDINGS{10.1145/1185373.1185426,
    author={Sangho  Shin and Henning  Schulzrinne},
    title={Balancing uplink and downlink delay of VoIP traffic in WLANs using Adaptive Priority Control (APC)},
    proceedings={3rd International ICST Conference on Quality of Service in Heterogeneous Wired/Wireless Networks},
    publisher={ACM},
    proceedings_a={QSHINE},
    year={2006},
    month={8},
    keywords={IEEE 802.11 VoIP QoS},
    doi={10.1145/1185373.1185426}
}

Sangho Shin
Henning Schulzrinne
Year: 2006
Balancing uplink and downlink delay of VoIP traffic in WLANs using Adaptive Priority Control (APC)
QSHINE
ACM
DOI: 10.1145/1185373.1185426

Sangho Shin¹^,*, Henning Schulzrinne¹^,*

1: Columbia University, Dept of Computer Science, New York, USA

*Contact email: sangho@cs.columbia.edu, hgs@cs.columbia.edu

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.

Keywords: IEEE 802.11 VoIP QoS

Published: 2006-08-09
Publisher: ACM

: http://dx.doi.org/10.1145/1185373.1185426