Abstract: The IEEE802.16e provides a technique called "sleep mode" to save the energy consumption of the MSS and a standard sleep mode control algorithm is given.This paper proposes an improved sleep mode control algorithm，which adjusts adaptively the sleep mode interval according to the traffic rate.Then this paper compares the 802.16e standard algorithm and the improved algorithm under four actual models.It has been observed that the proposed algorithm for sleep mode saves substantial amount of energy at lower traffic and almost same at higher traffic as compared to 802.16e.

摘要： IEEE802.16e标准采用了睡眠模式的技术来降低移动台的能量消耗，并给出了一个标准的控制算法。提出了一种改进的睡眠模式的控制算法，该算法根据接入速率的变化动态调整睡眠模式的睡眠周期。然后给出四种实际模型，在这些模型下对IEEE802.16e的标准算法与改进算法进行比较，可以看出改进算法在低接入速率下能更有效地节约能量，在高接入速率下与标准算法趋于一致。