Improved sleep mode mechanism based on IEEE 802.16e

In order to minimize the MS energy consumption and decrease the occupation of interface resources in BS, the sleep mode was introduced into the standard IEEE 802.16e.We characterized the standardized sleep mode in IEEE 802.16e, and then we gave an improved mechanism based on variable sleep interval energy and compared with the standard mechanism under four actual models. Through the simulation we could see the performance of the improved mechanism is better than the standard mechanism in energy saving. At last we studied the impact of key parameters on the improved mechanism performance.