针对简单泛洪效率低的问题,提出了一个限制洪泛的高效的路由广播算法,通过Euclidean距离来限制路由发现过程中请求分组被转发的次数;研究了减少路由维护开销,并降低路由发现的频率的方法,提出了一个基于节点高度的路由修复与优化算法,该算法使用节点监听来对链路断裂的路由进行修复与优化.基于限制泛洪的高效的路由广播算法和路由修复优化算法,提出了一种新的低开销的MANET网络按需路由协议LOOR(low overhead on-demand routing).仿真结果表明,新协议增强了路由的顽健性,减少了路由跳数,降低了路由发现的频率,提高了数据分组递送率,并显著地降低了路由控制开销.%To improve the performance of flooding, an efficient broadcasting algorithm with constrained flooding was proposed, this algorithm only selected efficient some from all routing packets to forward according to Euclidean Distance. A packet listening method, which could reduce route maintenance overhead and route discovery frequency, was studied, then a local route repair and optimization algorithm, which was based on node height and can repair the failure path due to link breakage, was presented. Furthermore, based on the efficient broadcasting algorithm and local route repair and optimization algorithm, a new on-demand routing protocol, named LOOR(low overhead on-demand routing), was proposed. The simulation results on ns2 show that LOOR can enhance the route robustness, decrease the average hop count, the route discovery frequency and the routing overhead obviously, and increase the packet defivery ratio.
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