Mobility

Empirical Modeling and Estimation of End-to-End VoIP Delay Over Mobile Multi-Hop Wireless Networks

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Executive Summary

Voice-over-IP (VoIP) systems face the following two general constraints: a stringent end-to-end delay constraint of at most 500 ms has to be satisfied, including not only the end-to-end networking delay, but also delays incurred due to encoding, decoding, as well as play-out buffer delays. An end-to-end Packet Delivery Ratio (PDR) of at least 95% has to be satisfied for high-quality voice. These constraints become very challenging to satisfy in mobile multi-hop networks due to the following reasons: First, the mobility of the nodes causes rapid, significant route breaks, which results in the significant problem of route maintenance.

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