A Study Of The Impact Of Link Interruption On Bundle Protocol In DTN

The Delay/Disruption-Tolerant Network(DTN)is considered to be a network architecture that can effectively deal with space or restricted network environments.The bundle protocol is an overlay protocol in the DTN structure.It mainly adopts store-andforward and custody transfer option mechanisms to ensure the reliability of data transmission.Because of the bad communication environment,the links will be interrupted frequently,which will result in the degraded data transmission performance.At present,there are not many studies on the reliability of bundle protocol data transmission under long interruption link environment.The data transmission of the bundle protocol was modeled and experimented in the case of an outage in the air communication,and two different mathematical models of the bundle transmission were established.The first is a "time factor" model that only considers the time of occurrence of an interrupt and the duration of the interruption.The second model is the "time-distance factor" model that takes into account both the time and duration of the interruption and also the position and length of the interruption in the link.The two models focus on the number of transmission,delivery time and throughput of bundle when the link is interrupted.Test platform SCNT was used to simulate the deep space communication nodes.Through experiments,the effectiveness and reliability of the mathematical model of the bundle transmission under the two link interruptions were verified effectively.It is illustrated that the BP/UDPCL/UDP network architecture can better overcome the disruption of channel links.