Ensuring the QoS requirements in 802.16 scheduling
Proceedings of the 9th ACM international symposium on Modeling analysis and simulation of wireless and mobile systems
Fundamentals of WiMAX: Understanding Broadband Wireless Networking (Prentice Hall Communications Engineering and Emerging Technologies Series)
Design and implementation of a QoS-included WiMAX module for NS-2 simulator
Proceedings of the 1st international conference on Simulation tools and techniques for communications, networks and systems & workshops
Scheduling in IEEE 802.16e Mobile WiMAX networks: key issues and a survey
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
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Scheduling algorithms in WiMAX are of great importance due to their effect in delivering a high speed broadband while satisfying the traffic Quality of Service (QoS) constraints. A well designed scheduling algorithm should carefully deal with throughput maximization, delay constraints satisfaction and maintaining fairness among subscribers. This paper focuses on uplink (UL) scheduling effect on the performance of real time Polling Services (rtPS) QoS class performance using OFDM as a physical layer where rtPS is a service class for variable bit rate (VBR) data such as MPEG compressed video. Ensuring QoS constraints for rtPS class is challenging due to critical delay constraints and throughput requirements. The paper proposes an uplink scheduling algorithm called the Instantaneously Replacing Algorithm (IRA). The algorithm mainly schedules connections based on their Signal to Noise Ratio (SNR) but instantaneously replaces high SNR connections with connections that may violate their intended QoS requirements. The proposed algorithm is analyzed in the paper using an NS-2 simulation model. Comparing to another set of UL schedulers, simulation results show that the proposed algorithm enhances QoS Satisfaction in the network as it tends to minimize the delay and at the same time distribute the network resources in a fair manner among Subscriber Stations (SSs) while maintaining a throughput comparable to that achieved using SNR based approaches.