Abstract: Considering the problem that energy supplies are limited in DTN, a sleep scheme based on contact time was proposed. Nodes carry out adaptive strategy to adj ust wait time and sleep time according to former contact time, and reduce the probability of missing communication opportunities in sleep period. Simulation results indicate that Epidemic algorithm with SSCT can reduce network overhead and energy consumption based on high message delivery ratio, and SSCT has better performance on multi-copy routing algorithms compared with First Contact algorithm.

Key words: Delay/disruption tolerant network, Energy consumption, Sleep scheme, Contact time