VoIP codec adaptation algorithm in multirate 802.11 WLANs: distributed vs. centralized performance comparison

Authors:
Anna Sfairopoulou;Carlos Macián;Boris Bellalta
Affiliations:
Network Technologies and Strategies, Universitat Pompeu Fabra, Barcelona, Spain;Network Technologies and Strategies, Universitat Pompeu Fabra, Barcelona, Spain;Network Technologies and Strategies, Universitat Pompeu Fabra, Barcelona, Spain
Venue:
EUNICE'07 Proceedings of the 13th open European summer school and IFIP TC6.6 conference on Dependable and adaptable networks and services
Year:
2007

Citing 3
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Abstract

Multirate 802.11 environments are quite problematic for VoIP traffic, with the rate changes of some of the flows affecting the transmission of all others. Building upon our previous results, we propose an algorithm which, based on the combined feedback from Real-Time Control Protocol (RTCP) packets and the MAC layer, can dynamically adapt the codecs of ongoing VoIP calls to adjust them to the multirate scenario. A comparison of both the centralized and distributed versions of the algorithm is provided for a wired-wireless scenario, showing an important capacity and quality increase over the standard case.