Unified Comms

VoIP on Wireless Meshes: Models, Algorithms and Evaluation

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Executive Summary

The paper studies the problem of supporting VoIP calls in a wireless mesh network. Specifically, the paper proposes solutions for Call Admission Control (CAC) and route selection for VoIP calls. Call admission decisions must evaluate how the capacity of the mesh network is utilized by the existing calls. The paper addresses this issue via a measurement-based modeling effort to model mutual interference between wireless links. The modeling approach evaluates whether capacity constraints (or, required QoS metrics) will be satisfied if a new call is admitted with a given route. Evaluations with a 6-node 802.11a testbed demonstrate excellent accuracy of the model and thus also the CAC performance.

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