一种基于802.11DCF的Ad Hoc网络节能协议

为了将一种基于802．11DCF的无线局域网节能MAC协议802．11PS用于多跳移动网络，提出了一种改进的报文驱动无线网卡动态关闭节能协议802．11NPS．802．11NPS使无关结点收到控制报文后延迟关闭无线网卡，从而很好地支持了路由协议的正常运行．它无需全网同步机制，也可用于全互连网络．文中还采用较精确的能耗模型对802．11NPS协议的性能进行了仿真研究，结果表明：在所考虑的仿真环境下，802．11NPS在全互连网络中最多可节能60％，在多跳移动AdHoe网络中最多可节能18％；802．11NPS的时延性能优于802．11DCF，而吞吐率则与802．11DCF大体相当．

An 802.11DCF-Based Power-Saving Protocol for Ad Hoc Networks

To extend the usage scope of an 802.11DCF-based wireless LAN power-saving MAC protocol 802.11PS to a multi-hop mobile environment,a modified version called 802.11NPS is proposed.It applies a packet-driven dynamic switching-off mechanism to the wireless network interface card to save power.By delaying the switching operations after the nodes receive unrelated control packets,802.11NPS can excellently support the upper-layer routing protocol.It does not need the global synchronization and can also be used in fully-connected networks.Moreover,by using a more accurate power-consumption model,the performance of 802.11NPS is studied by simulation.The results show that,within the simulated scenarios under consideration,802.11NPS can save power by 60% at its maximum in a fully-connected network and by 18% at its maximum in a multi-hop mobile ad hoc network,and that 802.11NPS is of a similar throughput to 802.11DCF and is of better delay performance than the latter.