Abstract
In mobile environment, how to extend the life time of mobile devices is an important issue. This thesis presents an energy conservation scheme, Maximum Unavailability Interval (MUI), to improve the energy efficiency for Power Saving Class of Type II in IEEE 802.16e. By applying the Chinese Remainder Theorem, the proposed MUI is guaranteed to find the maximum Unavailability Interval, during which the transceiver of a mobile station can be powered down. In Type II, there are three parameters: (1) sleep window, (2) listening window, and (3) start frame number. The proposed MUI only dynamically adjusts one parameter, the start frame number. The other two parameters are set according to Quality of Service (QoS) requirements of the connections. Our proposed scheme will not change them. In addition,our proposed scheme is fully compatible with 802.16e standard. We also propose a new table-based algorithm to reduce the computational complexity when solving the ChineseRemainder Theorem problem. Simulation and analysis have been conducted to evaluate and compare the performance of the proposed MUI using Chinese Remainder Algorithm and Table-based Algorithm with a brute force algorithm. Both simulation and analysis show that the proposed MUI with table-based algorithm performs better than the other two schemes.