摘要： 已有的移动自组网与Internet的互联协议由于无法克服网关发现过程中的单向链路并且因盲目转播网关发现报文形成广播风暴等原因而致使性能严重恶化。该文提出了一种增强型的综合互联协议，该协议一方面采用效率较高的综合方式进行网关发现，另一方面则通过交换携带有对称邻居列表和非对称邻居列表的HELLO分组而有效克服了网关发现过程中的单向链路，同时抑制了广播风暴的形成。基于NS2的仿真结果显示该增强型的综合互联协议在不引入新控制分组的前提下能显著提升互联性能，降低互联开销。

关键词: 移动自组网, Internet互联, 网关发现, 单向链路, 广播风暴

Abstract: Although an autonomous mobile Ad Hoc network (MANET) is useful in many scenarios, a MANET connected to the Internet is more desirable. In such integrated scenarios, commonly known as hybrid Ad Hoc networks, performance of the Internet connectivity will be degraded greatly if obvious unidirectional links are ignored and gateway discovery packets are rebroadcasted blindly during MANET nodes discovery available Internet gateway. The routing protocol called Ad Hoc on-demand distance vector (AODV) has been modified to set up multihop paths to the Internet gateways in the MANET. Through exchanging HELLO packets which are identical to the AODV hello packets except for the additional neighbor list and partner list, unidirectional links are removed from route computations and redundant rebroadcast of the broadcast packets are inhibited simultaneously in the procedure of gateway discovering. Performance results using NS2 simulations, under varying number of unidirectional links and node speeds, show that the Internet connectivity scheme can provide better performance than others due to avoiding unidirectional links and relieving broadcast storm, and is a step closer to making the large-scale deployment of MANETs a reality.

Key words: mobile Ad Hoc network, Internet connectivity, gateway discovery, unidirectional link, broadcast storm

中图分类号: 

• TP393