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The Scientific World Journal
Volume 2014 (2014), Article ID 957158, 9 pages
http://dx.doi.org/10.1155/2014/957158
Research Article

Multiple Power-Saving MSSs Scheduling Methods for IEEE802.16e Broadband Wireless Networks

Department Computer Science and Information Engineering, National Formosa University, No. 64, Wénhuà Road, Huwei Township, Yunlin County 632, Taiwan

Received 21 August 2013; Accepted 18 October 2013; Published 9 January 2014

Academic Editors: C. Pan and S.-E. Yoo

Copyright © 2014 Shih-Chang Huang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work proposes two enhanced multiple mobile subscriber stations (MSSs) power-saving scheduling methods for IEEE802.16e broadband wireless networks. The proposed methods are designed for the Unsolicited Grant Service (UGS) of IEEE802.16e. To reduce the active periods of all power-saving MSSs, the base station (BS) allocates each MSS fewest possible transmission frames to retrieve its data from the BS. The BS interlaces the active periods of each MSS to increase the amount of scheduled MSSs and splits the overflowing transmission frames to maximize the bandwidth utilization. Simulation results reveal that interlacing the active periods of MSSs can increase the number of scheduled MSSs to more than four times of that in the Direct scheduling method. The bandwidth utilization can thus be improved by 60%–70%. Splitting the overflowing transmission frames can improve bandwidth utilization by more than 10% over that achieved using the method of interlacing active periods, with a sacrifice of only 1% of the sleep periods in the interlacing active period method.