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Journal of Communications Software and Systems, Vol.2 No.4 December 2006. -

VoIP service over WLAN networks is a promising alternative to provide mobile voice communications. However, several performance problems appear due to i heavy protocol overheads, ii unfairness and asymmetry between the uplink and downlink flows, and iii the coexistence with other traffic flows. This paper addresses the performance of VoIP communications with simultaneous presence of bidirectional TCP traffic, and shows how the presence of elastic flows drastically reduces the capacity of the system. To solve this limitation a simple solution is proposed using an adaptive Admission and Rate Control algorithm which tunes the BEB Binary Exponential Backoff parameters. Analytical results are obtained by using an IEEE 802.11e user centric queuing model based on a bulk service M=G1;B=1=K queue, which is able to capture the main dynamics of the EDCA-based traffic differentiation parameters AIFS, BEB and TXOP. The results show that the improvement achieved by our scheme on the overall VoIP performance is significant.

Autor: Boris Bellalta - ; Departament de Tecnologia, Universitat Pompeu Fabra, Barcelona, Spain Michela Meo - ; Dipartimento di Elettron

Fuente: http://hrcak.srce.hr/


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