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Ad hoc网络是一种无有线基础设施支持的移动网络,它与internet相比存在许多差异,不仅有网络拓扑结构的不同,还存在通信方式的不同,因此两者的互联是一具有挑战性的课题。Ad hoc网络结点要进行internet连接,必须寻找internet网关,如何发现和维持与网关的连接以及如何切换到一个更合适的相邻网关是这个问题的关键。文章在主动式、被动式、混合式及AODV路由协议中Hello消息机制的基础上,讨论了一种新的网关发现方法,即利用Hello消息机制,通过改进网关和节点对Hello消息的处理所得到的新的网关发现机制,仿真结果显示在一定网络环境下能够基本满足adhoc接入internet的需要。
Ad hoc network is a kind of mobile network without wireline infrastructure support. Compared with the internet, there are many differences. Ad hoc networks not only have different network topologies, but also different communication methods, so the interconnection between them is a challenging one Question. Ad hoc network nodes for internet connection, you must find the internet gateway, how to find and maintain the connection with the gateway and how to switch to a more appropriate adjacent gateway is the key to this problem. Based on the Hello message mechanism in active, passive, hybrid and AODV routing protocols, the article discusses a new gateway discovery method, which is to use Hello message mechanism to improve the processing of Hello messages by gateways and nodes The new gateway discovery mechanism, simulation results show that in a certain network environment can basically meet the adhoc access internet needs.