| The need of wireless transmission rate is increasing in B3G network along with the fast development of new multimedia and the advance of voice traffic. Users want the communication goal of 5W (Whoever, Whenever, Wherever, Whomever, Whatever). Mobile communication is combined with business affairs and entertainment application and so on, it is realized by terminal improvement.for one side, Service provider want to carry out terminal standard to stand out the services, for another thing, terminal manufacturer want to empolder the terminal adapted to the need of market.As an important part, WMAN (Wireless Metropolitan Area Networks) will lead to a new tide and get broad applications in industry and social life in future.Originally, IEEE 802.16 has been designed for fixed subscriber stations (SSs). On the other hand, the recently-developed IEEE 802.16e is an extension targeting at the service provisioning to the Mobile Subscriber Stations (MSSs). As part of the mobility extension, the 802.16e mainly defines two functions, namely, a sleep-mode operation and a handover procedure. WMAN is the most widespread use for broadband wireless. It very suits for voice communication and supports video service and Multimedia service. Energy efficiency is very important in IEEE802.16e.In this report, we study and research MAC layer based on IEEE802.16, we study the Energy efficiency scheme, by devising and optimizing it, we advance the performance. My work is described as follows:1. We characterize the standardized sleep mode in IEEE 802.16e. And then we build the system models for the energy consumption and the average packet delay affected by sleep-mode using statistics. At last, we give the simulation on the analytical result by MATLAB and a conclusion.2. In IEEE802.16e, the exponential increase algorithm of sleep window brings on long response time in low traffic scenario, this paper presents exponential weight smooth increase algorithm to solve this problem, It decrease the average response time by slowing the increasing sleep window, We have hardware design of Sleep_time_caculator, the whole system's hardware framework and the state shift analysis. The new algorithm improve on the performance when the incoming data rate is small, it decrease the average wating time at the same time with proper average energy consumption.3. Based on the IEEE802.16e, we characterize a new sleep mode considering uplink and downlink data transfer; we assume that the uplink data will terminate the sleep mode immediately. We make the model, analyze the influences on energy consumption and the sleep time using statistics and then do associated hardware design. At last we give the simulation on the analytical results by Matlab. |
