MANET与Internet互联时的广播风暴抑制策略

Adaptive Approaches of Relieving Broadcast Storms Connecting MANET to Internet

Mobile Ad Hoc网络(MANET)与Internet互联时,如何使Internet网关适应MANET高度动态变化的网络条件与实际连接需求,以合理的开销向MANET通告可用网关信息是获取良好互联性能的关键。该文根据那些欲访问Internet的MANET节点距离Internet网关的实时位置及其访问需求自适应地设置网关通告报文之TTL值以实现最佳覆盖,同时采用基于计数的广播风暴抑制策略有效地抑制了洪泛网关通告报文所形成的广播风暴。用NS2进行的仿真说明该文提出的方法在将节点密度及规模变化的MANET接入Internet时能获取良好的连接性能而开销合理。

Mobile Ad Hoc networks are extremely flexible, self-configurable and easy-to-deploy wireless networks. The biggest challenge to connect mobile Ad Hoc networks to the Internet stems from the need to ＇inform ad hoc nodes about available gateways in an extremely changing scenario while making a reasonable consumption of the scarce network resources. This paper proposes and simulates a new adaptive Internetworking scheme that not only can adjust the scope of the gateway advertisement packets dynamically, but also can relieve broadcasting storms of flooding gateway advertisement packets with counter-based scheme. Simulation results with NS2 show that the approach can adapt to the change of mobile ad hoc networks＇ scale and node density well and can achieve good connectivity while keeping overhead costs low.