AN EVALUATION ON DIFFERENT VOIP PRODUCTS ON CHANNEL AND ROUTING SCHEME OVER WIRELESS MESH NETWORKS

electronics and communication engineering

In the recent past, there has been a tremendous increase in the popularity of VoIP services as a result of huge growth in broadband access. The same voice-over-Internet protocol (VoIP) service poses new challenges when deployed over a wireless mesh network, while enabling users to make voice calls using WiFi phones. Packet losses and delay due to interference in a multiple-hop mesh network with limited capacity can significantly degrade the end-to-end VoIP call quality. In this paper, the effect of four different VOIP audio compression strategies namely G.711, G.723.1, G.729A and GSM..EFR is examined on to evaluate the performance Weighted Cumulative ETT (WCETT) and Hybrid Wireless Mesh Protocol (HWMP) routing protocol under Minimum interference channel allocation (MICA) scheme over multi-radio multi-channel wireless mesh network. Performance in multi-hop MR- MC Wireless Mesh Networks is known to degrade with the number of hops for UDP traffic. Voice codecs are the algorithms that enable the system to carry analog voice over digital lines. The choice of voice codec is important because it has to fit the particularities of the transport network. Compressing voice signals while keeping the quality perceived by users at acceptable levels represents a daunting challenge. The methods that have been proposed for the compression of audio signals, which are referred to as voice codecs. Voice codecs are the algorithms that enable the system to carry analog voice over digital lines. There are several codecs, varying in complexity, bandwidth needed and voice quality. There are also several key challenges associated with VOIP is to choice efficient voice codec for radio interfaces in a multi-radio wireless mesh network.

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