Research On Key Technology Of The Marine Mobile Delay Tolerant Network

Delay tolerant network (DTN) is originated for the exploration and research onthe interplanetary networks by the U.S. department of defense research. DTN hassome characteristics, such as long delay, dynamic topology, low SNR, high error rate,intermittent connectivity, and plays a important role in deep space communications,wildlife research, communication in remote areas, vehicle network and marineenvironmental monitoring.Marine environmental monitoring occupies a crucial position in the military,environmental protection, marine biological research and other fields. At present, theresearchers of ocean monitoring at home and abroad carry out the studies ofunderwater sensor network，but the water sensor data are transmitted mainly viasatellite and radio communication which are not only costly, but also more vulnerableto the influence of geographical location. On the basis of consulting previous researchon vehicle network, we note that every day there are many vessels which carry on theoperation on the sea. Some vessels maybe pass through the monitoring area and carrya subset of monitoring data return to the monitoring center. So we propose the mobiledelay tolerant network via using the vessels to transmit the monitoring data. In thevessels mobile delay tolerant network, the sensor nodes in the monitoring area collectthe data. When the vessels pass through the monitoring area, the sensor nodestransmit the data to the vessels, and the vessels go on sailing. When the vessels returnto the vicinity of coast, they are capable to send all their carried data to the onshoresink node connected to the land control center directly. In this way, the monitoringdata are successfully transmitted from the sensor to the monitoring center.The main contributions of this paper are as follows:(1) Analyze the feasibility of using vessels to transmit the marine environmentalmonitoring data. In the ONE simulation platform simulate the vessels mobile delaytolerant network and verify its feasibility. And by several experiments analyze network parameters’ optimized values to improve the performance of delay tolerantnetwork.(2) Analyze the probability distributions of connect time and inter-connect timeamong vessels. Analyze the vessels’ raw data to obtain the contextual informationabout the vessels work which provides the basis of designing and optimizing themarine environmental monitoring delay tolerant network routing protocol.