Ad hoc Networks technology was proposed for military communications requirement at the very beginning. Among the previous research in the last few decades, Ad hoc networks is no longer limited to military communications and other special areas. Nowadays, it's becoming a trend to be integrated with mobile communications system to meet the requirement of civilian communications.In this paper, the basic theory of Ad hoc networks is illustrated, and then a simple analysis of difference on routing technology between Ad hoc networks and other communications networks is made. The special requirements of Ad hoc routing technology are enumerated. And then the problems of the current Ad hoc routing protocols are analyzed: such as the distance and vector-based routing protocols don't consider the node-energy impacts on routing, the saving-energy routing protocols are also ill-consideration on mobility of nodes when calculating optimal path which causes high rate of interruption.
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