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In the IEEE 802.16e WiMAX or WiBro, power saving is one of the important issues for the battery-powered Mobile Stations due to the mobility. The IEEE 802.16e standard provides different Power Saving Classes (PSCs) depending on parameters sets, procedures of activation or deactivation, and policies of MSs availability for data transmission. PSC I is recommended for Best Effort (BE) and non-real-time variable rate (NRT-VR) traffics while PSC II is recommended for Unsolicited Grant Service (UGS), Real-Time Variable Rate (RT-VR) traffics. PSC I is different from PSC II in the followings: first, PSC I adopts the binary exponential increasing algorithms for the size of sleep windows in case of no pending packets for the tagged MS, whereas PSC II uses a fixed size of sleep windows.
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