增强MANET与Internet互联的改进型网关发现方案

An improved gateway discovery approach to enhance Internet connectivity for mobile ad hoc networks

针对单向链路以及盲目广播网关发现分组等原因所致的MANET与Internet互联性能恶化提出了一种改进型网关发现方案.通过交换携带有对称邻居节点列表和非对称邻居节点列表的AODVHELLO分组,全局路由计算中的单向链路被清除而广播风暴也同时得到抑制.结合网关通告分组的自适应覆盖和HELLO发送优化机制,使得网关发现所依赖的广播路由计算的可靠性得到保证而无益的广播则被禁止.基于NS2的仿真结果表明改进型方案能适应动态变化的网络条件和Internet访问需求,以其增强机制为MANET提供更好的Internet连接.

An improved gateway discovery scheme has been proposed to enhance the Internet connectivity which is deteriorated due to unidirectional links and blind rebroadcast of gateway discovery packets for mobile ad hoc networks. Through exchanging AODV HELLO packet, which includes symmetric neighbor list and asymmetric neighbor list, unidirectional links are removed from global route computation and the broadcast storm also can be relieved simultaneously. Cooperated with the adaptive coverage of gateway discovery packets and the optimized HELLO broadcasting algorithm, the reliability of broadcasting route computation, upon which the lnternet gateway discovering is based, can be guaranteed and the profitless broadcasting is inhibited. Performance results of ns - 2 simulations show that this improved scheme can adapt itself to the dynamic change of network conditions as well as Internet access demand and provides better Internet connectivity for MANET than others due to its enhanced mechanism.