Abstract
In this paper, the Voice over Internet Protocol (VoIP) was analyzed, and the performance of the quality of service (QoS) parameters obtained through the OPNET simulation software was evaluated. The case study started with the analysis of the network structure .It examined the optimal planning parameters and considered to optimize the performance of the Worldwide Interoperability for Microwave Access network to increase the VoIP service performance. The simulation covered three scenarios with different configurations; each scenario was elevated in term of QoS. The simulations studied various cases including variation in cell radius, different number of users, and different number of cells. Results showed that increasing the cell radius does not increase the quality of the network, and increasing the number of users inside one cell also degrades the quality of the network. By contrast, distributing users into different cells increasesthe network performance but enhances the delay time and increases the throughput.
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