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Supporting as many VoIP (Voice over Internet Protocol) users as possible in a BWA (Broadband Wireless Access) network, using limited radio resources is a very important issue that could lead the IEEE 802.16e protocol to greater acceptance all over the world. However, VoIP service performance is affected by several characteristics defined in the BWA protocol, such as signaling overhead of control or MAP messages, ranging regions and wasted symbols, among others. In this paper, the authors present a performance optimization to support the maximum number of VoIP calls, using codecs G.711 and G.723.1. Simulation results validate the performance optimization in terms of throughput and mean access delay for VoIP traffic.
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