Dynamic Random Network Coding with Variable Multicast Rate in DTN Environment
Yi Xia, Deng Guanghong · Advances in computer science research · 2015
The traditional random network coding methods with fixed multicast capacity which is difficult to get with the DTN dynamical features of mobility, intermittent connectivity and dynamic topology.Direct at this problem, a Dynamic Random Network Coding (DRNC) method used in Delay Tolerant Networks (DTN) environment is proposed.According to the receiving data states of nodes, it first obtains the transmit speeds of every network channel, and then constructs the network flow graphic with channel capacities and calculates the network multicast capacity.Moreover, the random network coding scenario is extended and tailored according to the multicast capacity to transmit data packets in DTN environment.Based on this method, it can increase the data delivery probability and reduce the average latency of data packets.Ultimately, a simulated DTN environment is constructed and some simulation experiments are taken, the results show that, compare with the traditional network coding method with fixed multicast rate, the DRNC method has reduced the data delivery delay and increased the data delivery ratio.