Providing statistical QoS guarantee for voice over IP in the IEEE 802.11 wireless LANs
IEEE Wireless Communications
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Voice over Internet Protocol (VoIP), also called IP Telephony, is rapidly becoming a familiar term and technology that is invading enterprise, education and government organizations. This paper is focused on review of VoIP operation over 802.11b WLAN, the problems faced and their solutions. Main consideration is the multihop wireless network and the presence of TCP/UDP traffic. Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on both loss and delay. Several methods to improve voice quality and present experimental results from an 802.11b test bed optimized for voice delivery are investigated in this paper. Use of multiple interfaces, path diversity and aggregation, Call Admission and Rate Control (CARC) are shown to provide a combined. Feasibility of these methods is investigated and results are compared here.