Similar to traditional wireless sensor networks (WSN), the nodes only have limited memory\nand energy in low-duty-cycle sensor networks (LDC-WSN). However, different from WSN, the nodes\nin LDC-WSN often sleep most of their time to preserve their energies. The sleeping feature causes\nserious data transmission delay. However, each source node that has sensed data needs to quickly\ndisseminate its data to other nodes in the network for redundant storage. Otherwise, data would\nbe lost due to its source node possibly being destroyed by outer forces in a harsh environment. The\nquick dissemination requirement produces a contradiction with the sleeping delay in the network.\nHow to quickly disseminate all the source data to all the nodes with limited memory in the network\nfor effective preservation is a challenging issue. In this paper, a low-latency and energy-efficient data\npreservation mechanism in LDC-WSN is proposed. The mechanism is totally distributed. The data\ncan be disseminated to the network with low latency by using a revised probabilistic broadcasting\nmechanism, and then stored by the nodes with LT (Luby Transform) codes, which are a famous\nrateless erasure code. After the process of data dissemination and storage completes, some nodes\nmay die due to being destroyed by outer forces. If a mobile sink enters the network at any time\nand from any place to collect the data, it can recover all of the source data by visiting a small\nportion of survived nodes in the network. Theoretical analyses and simulation results show that our\nmechanism outperforms existing mechanisms in the performances of data dissemination delay and\nenergy efficiency.
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