Energy-efficient packet scheduling algorithms for real-time communications in a mobile WiMAX system

Authors:
Shiao-Li Tsao;You-Lin Chen
Affiliations:
Department of Computer Science, National Chiao Tung University, Room EC426, No. 1001 Ta Hsueh Road, Hsinchu 300, Taiwan, ROC;Department of Computer Science, National Chiao Tung University, Room EC426, No. 1001 Ta Hsueh Road, Hsinchu 300, Taiwan, ROC
Venue:
Computer Communications
Year:
2008

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Abstract

Broadband wireless access systems usually provide flexible sleep-mode operations for mobile stations to conserve their energy during idle or active mode. For example, Mobile WiMAX, i.e. the IEEE 802.16e, offers several power-saving classes that can be associated with different types of network connections to minimize power consumption of mobile stations. Unfortunately, previous studies did not fully utilize the sleep-mode features to save the energy of a mobile station with multiple real-time connections, and power consumption of a mobile station is not yet optimized. In this work, two energy-efficient packet scheduling algorithms for real-time communications in a Mobile WiMAX system are proposed. The schemes not only guarantee the quality of services (QoSs) of real-time connections but also minimize power consumption of mobile stations. Simulation results demonstrate that the proposed schemes outperform the traditional approach.