A New Scheduling Algorithm for Real Time Applications in WiMAX Networks

Quality of service (QoS) is still a crucial issue that deals with the IEEE 802.16 network performance. Scheduling is a key component of the MAC IEEE 802.16 layer which ensures QoS for different service classes. In this paper, we give a detailed simulation study for some scheduling algorithms by evaluating their performance in order to support the QoS classes. We propose a new WiMAX scheduling algorithm for real time applications, called minimum Delay maximum Signal to Interference Ratio (mDmSIR) which is suitable for real time Polling Service (rtPS) class. Our idea is to take into account the maximum latency required by the rtPS connections and their radio states. Our proposed scheme could be the better choice for variable-size real-time connections as it is a tradeoff between maintaining a higher throughput and minimizing the mean average delay. It gives a better results that show an improvement in term of delay. The simulation is carried out via the Network Simulator NS-2.34.