A Multi-Factor Scheduling Algorithm for WIMAX Systems
Keywords:
QoS, Opnet, OFDMA, scheduling algorithms, WIMAXAbstract
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)[12], 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 [13]. The results
show the proposed algorithm is capable to handle
different users’ requirements under congestion
conditions.
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