Per-flow sleep scheduling for power management in IEEE 802.16 wireless networks

Authors:
Jen-Jee Chen;Shih-Lin Wu;Shiou-Wen Wang;Yu-Chee Tseng
Affiliations:
Department of Electrical Engineering, National University of Tainan, Tainan 70005, Taiwan;Department of Computer Science and Information Engineering, Chang Gung University, Kweishan Taoyuan 33302, Taiwan;Department of Computer Science and Information Engineering, Chang Gung University, Kweishan Taoyuan 33302, Taiwan;Department of Computer Science, National Chiao Tung University, Hsin-Chu 30010, Taiwan and Research Center for Information Technology Innovation, Academia Sinica, Taipei 11529, Taiwan
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2011

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Abstract

Power management is a critical issue in IEEE 802.16 wireless networks. In the standard, a power saving class (PSC) of type II is defined to support real-time traffic flows. It allows a flow to switch periodically between active and sleep states to save energy. However, previous studies either consider adjusting start frames of PSCs by assuming that the PSCs are already given or assume one single PSC to accommodate all flows in a mobile station, thus leading to higher energy cost. This paper proposes two ''per-flow'' sleep scheduling schemes, which assign one PSC to each real-time flow according to its QoS parameters. This leads to less energy consumption, more efficient use of bandwidth, and more compact listening windows. We also prove that deciding whether a given scheduling problem is solvable can be reduced to a maximum matching problem, which is computationally tractable. Simulation results show that such a per-flow scheduling does perform much closer to the active ratio lower bound and achieve higher resource utilization than previous schemes.