Maritime Opportunistic Transmission: When and How Much Can DTN Node Deliver?

Maritime wireless communication delay tolerant networks (MWDTN) may develop slowly, if there is no efficient scheme to allocate network resources which are arrival data and limited energy. In this paper, we investigate the resources scheduling problem to utilize the sleeping scheduling (SS) and opportunistic transmission (OT) for energy conservation, while guaranteeing the Quality-of-Service (QoS) with worst-case delay. In addition, we assume the node of delay tolerant networks (DTN) only uses green energy absorbed from the sun and wind. We establish a reasonable harvest-and-consumption energy model. Considering to make a delay-energy tradeoff, an optimization algorithm based on Lyapunov optimization (LO), which makes the transmission determination for waking-up the DTN node and determines the optimal data quantity should be transmitted for current system state, is proposed to cope with the delay-energy tradeoff problem. Performance analysis indicates the restrictions in particular system status, such as upper bounds of queue and the worst-case delay. The simulation results illustrate that the proposed algorithm has competency to allocate energy efficiently within worst-case delay.