An effective approach to improving packet delivery fraction of ad hoc network

This paper addresses the subject of improving performance of an ad hoc network system suffering from high resource contention by improving its packet delivery fraction. The suggested system model assumes that nodes can be divided into two classes: the servers that provide services and the clients that request services provided by servers. It is found that for such a system, it is the server and its adjacent nodes that dominate performance, and tend to cause bottlenecks due to congestion. To reduce the possibility of bottleneck occurrences, it is suggested that resource contention of the area where a server node is located be relieved. This is achieved mainly by decoupling route-requesting from service-providing activities, and reducing the former. On the one hand, for each busy, and thus critical server, a node cluster is created by constructing a server-centered connected dominating set to actively reduce contention level. On the other hand, routes are adaptively selected to avoid high congestion area. It is found that in this way, the overall data packet delivery fraction can be improved greatly. Results of simulation experiments demonstrated the effectiveness of the proposed approach.