A Packet Scheduling Scheme for Enhanced QoS in WiMAX

WiMAX is one of the most promising broadband wireless technologies today. The WiMAX standard IEEE 802.16 is designed to provide Quality of Service (QoS) to delay—sensitive traffic like video and voice. However, the standard does not specify any particular scheduling algorithm to achieve the above objective. This paper proposes a novel packet scheduling scheme for providing QoS to downlink traffic i.e. traffic transmission from the base station (BS) to the subscriber stations (SS) in WiMAX. The primary objective in designing the scheduling scheme is to provide each traffic type with appropriate resources such that it meets its average packet delay and average packet loss criteria. Extensive simulations have been performed to test our scheduling algorithm. Simulation results demonstrate that our scheduling scheme minimizes the packet loss and almost always meets the average packet delay constraint even in a heavily loaded network.

[1]  P. Testa,et al.  Performance analysis of an efficient packet-based IEEE 802.16 MAC supporting adaptive modulation and coding , 2006, 2006 International Symposium on Computer Networks.

[2]  Mohammad Hayajneh,et al.  Uplink and downlink scheduling for point to multipoint WiMAX Networks , 2009 .

[3]  Jianhua Lu,et al.  Call Admission Control and Scheduling Schemes with QoS Support for Real-time Video Applications in IEEE 802.16 Networks , 2006, J. Multim..

[4]  Aura Ganz,et al.  Packet scheduling for QoS support in IEEE 802.16 broadband wireless access systems , 2003, Int. J. Commun. Syst..

[5]  Deming Liu,et al.  An efficient scheduling discipline for packet switching networks using earliest deadline first round robin* , 2003, Proceedings. 12th International Conference on Computer Communications and Networks (IEEE Cat. No.03EX712).

[6]  K. Vinay,et al.  Performance evaluation of end-to-end delay by hybrid scheduling algorithm for QoS in IEEE 802.16 network , 2006, 2006 IFIP International Conference on Wireless and Optical Communications Networks.

[7]  H. Sirisena,et al.  Quality of Service Scheduling in IEEE 802.16 Broadband Wireless Networks , 2006, First International Conference on Industrial and Information Systems.

[8]  Costas Courcoubetis,et al.  Weighted Round-Robin Cell Multiplexing in a General-Purpose ATM Switch Chip , 1991, IEEE J. Sel. Areas Commun..

[9]  Debabrata Das,et al.  Service class downlink scheduling in WiMAX , 2008, 2008 3rd International Conference on Communication Systems Software and Middleware and Workshops (COMSWARE '08).