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SIMULATION BASED ANALYSIS FOR QUALITY OF SERVICE OF 802.16 BASED MESH NETWORKS

Shahbaaz Singh

WiMAX is a new technology that offers high data rate and high reliability. There are many factors and challenges that need to be taken care of and that affects the quality of services of WiMAX based networks. One factor is type of applications that are deployed or configured by using the services of 802.16 based wireless networks. Day by day, as the new applications are getting designed, the performance evaluation of WiMAX based networks to measure the quality of services of networks is required again and again. In the given work, various networks are designed by using WiMAX based wireless nodes by using a discrete event simulator 'OPNET'. To generate data in the networks, three different client-server architecture based applications generating high load FTP, high load HTTP and heavy Email data. To manage the data in the networks, priority queues are configured between access point and backbone network. For congestion control in the queues, Random Early detection (RED) algorithm has used with optimized configuration parameters. Various performance evaluation metrics are used to evaluate the performance of the designed network to rate the quality of services. After running intensive simulations, it has concluded that, Wimax shows high quality of service rates, when the networks are used to transfer HTTP based data and the performance of the networks degrades, when the network is used to upload or download the data i.e. if the networks use FTP based application.