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ThinkMind // International Journal On Advances in Networks and Services, volume 3, numbers 3 and 4, 2010 // View article netser_v3_n34_2010_2


Call Admission Control Dimensioning for VoIP Traffic over Wireless Access Networks: From Network to Application-specific Perspective

Authors:
Kiril Kassev
Yakim Mihov
Adriana Kalaydzhieva
Boris Tsankov

Keywords: CAC; comfort noise generation; MOS; packet loss; perceived voice quality; VoIP over wireless access networks

Abstract:
Admission control is a key issue for quality of service (QoS) provisioning in both wired and wireless communication networks. Providing QoS for voice traffic transmission over packet-based network is a crucial task, which requires development of accurate resource estimation models. In order to perform bandwidth saving and improve the naturalness of the voice service contemporary voice coding schemes are equipped with the functionality of voice activity detection and background noise transmission during inactive speech periods. The adoption of traditional ON-OFF traffic model may cause significant errors in estimating the bandwidth required to meet the performance bounds of aggregated traffic flow. The aim of this article is to present a “new paradigm” of call admission control (CAC) dimensioning applicable to wireless access transmission media. The admission decision policy is codec-dependent and relies on the concept of user-perceived voice quality, since it could provide a tight connection with the QoS metrics that shall be guaranteed by the network. The well-known bufferless fluid-flow method is applied and new simple exact formulas for CAC performance evaluation are derived. The proposed methods are illustrated with numerical examples and some comparisons are made.

Pages: 333 to 345

Copyright: Copyright (c) to authors, 2010. Used with permission.

Publication date: April 6, 2011

Published in: journal

ISSN: 1942-2644

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