Dynamic Control Flooding Based DTN Routing Strategy Optimizing

The traditional Internet based on TCP/IP is a technology developing in depth, andbecoming the infrastructure of people’s life and development, directly affect the way oflife. However the traditional Internet must meet some of the basic assumptions:continuous end-to-end communication, the smaller end-to-end delay, the smaller bit errorrate, etc. DTN(Delay/Disruption Tolerant Network) is a new kind of typical challengednetwork, it is to point to the mobile networks which can still work effectively in thespecial circumstances of end-to-end connection can’t guarantee and long transmissiondelay. The network can’t satisfy the basic assumptions of above.The mainstream routing strategy is based on a store-and-forward flooding model, ithas high delivery ratio, low delay, widely used, etc, but the flooding way makes highoverhead ratio and network congestion; in addition as the node connection and memoerydeteriorated in the low node density, the DTN routing performed worse when the nodedensity is low. The DS&W (Dynamic Spray&Wait) routing strategy and the WDM(Waveform Decreasing Multi-copy) routing strategy are based on the basic strategy offlooding model, assessed the scale of message flooding and make it be controldynamically, so as to improve the efficiency of routing strategy. They are aimed tooptimize the high overhead ratio in flooding strategy and the low efficiency of routing inlow node density situation.These two routing strategies performed much better than the mainstream routingstrategies in the environment of the ONE (Opportunistic Network Environment). Thesimulation results show that the performances are obviously increased compared with thetraditional routing strategies.