基于自适应策略的移动自组网与Internet互联

Interconnection of mobile ad hoc networks with Internet based on an adaptive approach

将Mobile IP与AODV路由协议进行集成以满足移动自组网MANET的Internet访问需求.Mobile IP的FA通过被动接收、解析源节点发送的RREQ-I以了解源节点数量及MANET规模.FA据此将代理通告的TTL作为参数进行自适应调整以实现最佳的代理通告覆盖.由于自适应协议无需额外开销且能根据MANET实际需要改变其提供全局连接信息的主动程度,而其中间节点也可向源节点及时提供自己侦听到的全局连接信息并抑制广播分组的进一步扩散,因此能为网络条件高度动态变化的MANET提供良好的互联性能并保持合理的开销,用NS2进行的仿真结果证明了其有效性.

Mobile IP and ad hoc on-demand distance vector routing protocol are extended and work together to provide Internet access service to ad hoc nodes. And a new adaptive Internet working scheme was proposed in which the TTL of agent advertisements was used as the parameter to adjust depending on the network conditions. Without additional control overhead introduced, FA can estimate the networks conditions such as the number of source nodes, the scale of ad hoc network and the network topology changing speed through analyzing RREQ-I packets. Combined with other technologies, such as eavesdropping and caching agent advertisements, adaptive approach can change its proactiveness or reactiveness dynamically and reduce the overhead of the gateway discovery without jeopardizing the overall network performance. Simulation results with NS2 show that the adaptive scheme outperforms existing mechanisms over a variety of scenarios and mobility rates.