Computer Science ›› 2014, Vol. 41 ›› Issue (4): 31-35.

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Study on Markov Predictive M-LWDF Scheduling Algorithm in M-WiMAX

HU Yong-dong,WU Guo-xin and XU Yi-qing   

  • Online:2018-11-14 Published:2018-11-14

Abstract: In the M-WiMAX system,in order to obtain a multi-user diversity gain and better use Adaptive Modulation and Coding (AMC),a predictive scheduling algorithm (Pre-LWDF) was designed with M-LWDF to schedule real-time traffic of WiMAX.M-LWDF algorithm uses instantaneous rate as a judgment parameter at time of the scheduling,therefore,the stability and overall performance of the scheduling algorithm are affected,especially in the mobile wireless communication.Markov prediction model was employed to calculate the instantaneous rate of the next scheduling time,and then smooth out the current instantaneous rate,thus the effect of instantaneous rate on scheduling performance was reduced.The smoothed instantaneous rate can better represent the transmission rate trends of the mobile wireless channel.Simulation results show that the scheduling algorithm insures QoS for rtPS and ertPS traffic and improves the system’s average throughput and fairness.

Key words: M-WiMAX,Markov prediction model,M-LWDF,Multi-user diversity gain

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