Abstract—This paper proposes a new scheduling algorithm for IEEE 802.16-2005 Broadband Wireless Metropolitan Area Networks in TDD mode. Unlike most scheduling algorithm which use one Qos parameter like Maximum Sustained Rate(MST), delay or priority to take the scheduling decision, the proposed algorithm uses all these parameters plus Jitter, Minimum rate, and class type. The algorithm put all these parameters in one polynomial, that gives priority to traffic session based on its class type, priority, and its lower QoS constrains. The priority of different sessions varies in time based on system dynamics, and the expected output of the system is a fair distribution for all session, with a maximization of throughput of priority traffic. In this work, a detailed simulation study is carried out for the proposed scheduling algorithm as well as comparing its performance with some known algorithms such as Proportional Fairness (PF), Round Robin (RR), and Strict-Priority. Analyses and evaluation of the performance of the scheduler to support the different QoS classes is given as well. The simulation is carried out via the Opnet modeler simulator . The results show the proposed algorithm is capable to handle different users’ requirements under congestion conditions.
Index Terms—QoS, Opnet, OFDMA, scheduling algorithms, WIMAX
The authors are with the Faculty of Engineering Cairo University, Egypt
Cite: Ahmed H. El-Shinnawy, Mohamed M. Elgazzar, and Amin M. Nassar, "A Multi-Factor Scheduling Algorithm for WIMAX Systems," International Journal of Information and Electronics Engineering vol. 2, no. 3, pp. 347-351, 2012.