Performance Evaluation of Scheduling Algorithms in Fixed WiMAX Network

Abstract

Scheduling Algorithm performance in Worldwide Interoperability for Microwave Access Network (WiMAX) or IEEE802.16 promotes a huge success due to its current availability in the network, providing multiple and high rate capabilities. However, several algorithms have been proposed and designed, in order to achieve high quality of service (QoS) in the network. Not all can be selected to implement in real WiMAX, rather a need to know and choose the best ones for real WiMAX development. In order to do this, the study employs simulation scenario of considered different scheduling algorithms in order to measure their performances such as the loss rate. Their behaviours are investigated using MATLAB simulation tool and the results are compared. The end to end loss rate experienced with all the considered algorithm is high compared to International Telecommunication Union (ITU) standard. Our contribution is to minimize and improve the Algorithms as a result of the shortcomings experienced. The number of channels created in this layer to reduce the end to end loss rate is realized using the Reconfigurable Optical add-drop Multiplexer (ROADM) technique in the MAC layer. This is because MAC layer supports data communication and routing. This technique generate channels, controls and monitors flow rate of data in the MAC layer using a mathematical model to reduce the loss rate in the network. The results achieved from the qualitative analysis show that the performance of the improved algorithm is accomplished as result of low loss rate as a result of increasing the number of channels in the MAC layer. High throughput is attained due to high flow rate of real time application and more so, fair sharing of resources is achieved in different scenarios with different times and sizes.