An Improved Points Area Routing Algorithm Study

With the improvement of human cognition, and the expanding range of activities, theenvironment the people faced will be more complex. No matter whereever people need tocommunicate with each other, the traditional Internet cannot fully satisfy new use in theseemerging new fields, so people develop a series of new network systerm structures forcommunication, DTN (Delay Tolerant network) is one of them. The difference fromtraditional network is that the DTN has distinct characteristics such as high latency,frequently interrupt, high bit error,etc, so the TCP/IP protocol used in Internet is no longerapplicable in the DTN, people need to develop new protocols in order to adapt to theseparticular communication environment.DTN routing has been one of the hotspots in DTN. Due to the special nature of the DTN,the traditional routing protocols for the Internet cannot be applied directly in the DTN,people need to work out a new kind of routing protocol in order to use in DTN. The researchof DTN routing protocol has got some achievements, and some protocols have been appliedin some specific areas. But after all, the research is just starting, so a lot of protocols havemany inadequacies to improve.At first we introduce the steps of NS for simulation and some auxiliary tools, and NSsoftware is used to simulate Prophet, Spray and Focus protocols and compare performance.We selected Spray and Focus protocol to study. We add the concepts of searching area andselection time in Spray and Focus protocol in order to solve the problem of equalization ofdelivery and success rate. We name the new protocol as Improved Spray and Focus, wesimualte the two protocols and compare performance. Subsequently, this paper combinesISNF protocol with AODV protocol in Ad hoc network and gets a subregional routingprotocol, named AO-IS protocol, which absorbs the advantages of high stability, low cost.Finally, we compare the performance of AO-IS, ISNF and AODV protocol.