Reliable Energy-efficient Routing Algorithm In Delay Tolerant Mobile Sensor Network

The links of Delay Tolerant Mobile Sensor Network(DTMSN)are intermittently connected,which leads to loss data packets randomly during the routing process and affects the reliability of data transmission.In addition,the energy of the sensor node comes from the battery and it is easy to fail due to insufficient power.Therefore,under the condition of ensuring the link reliability,reducing the energy consumption of nodes and balancing the energy in the entire DTMSN to prolong the network lifetime becomes an important problem to be solved.Based on the existing research,this dissertation proposes two reliable energyefficient routing algorithms for data transmission problems in DTMSN: reliable energy-efficient routing algorithm based on distance optimization and reliable routing algorithm based on energy cost.The main contributions and research findings are as the following:(1)Reliable energy-efficient routing algorithm based on distance optimization.It introduces "reliable energy-efficient distance" and "reliable energy-balance distance" under the link quality assurance of hop-by-hop(HBH)confirmation retransmission mechanism.By analyzing the distance between nodes,the moving direction of the node and the current energy of the node to determine the comprehensive utility of the node,and finally forwarding the message according to the comprehensive utility.The experimental results show that this routing algorithm not only improves the delivery ratio significantly and prolongs the network lifetime,but also improves the energy efficiency of the sensor nodes under the guarantee of reliability,and optimizes the energy balance performance.(2)Reliable routing algorithm based on energy cost.First,it designs a RECBD metric under the link quality assurance of the HBH confirming retransmission mechanism.The RECBD value of the node is determined by analyzing the energy consumption of the node,the remaining energy of the sensor node,the expected energy cost of the forwarding node and the probability of successful data reception by the forwarding node.Finally,messages are transmitted according to the RECBD.Experimental results show that the routing algorithm further improves the delivery ratio and network lifetime,also improves the energy performance of the network.