LLNs are gradually attracting people�s attention for the feature of low energy consumption. RPL is specifically designed for LLNs to\nconstruct a high energy efficiency network topology. In the noisy environment, the packet loss rate of RPL-based WSN increases\nduring data transmission. The DODAG constructed by RPL-based WSN increases in depth when communication is affected by\nnoise. In this situation the data transmission in the network will consume more energy. In event detectionWSNs, the appropriate\nnetwork topology enables root to use less sensor data to fuse enough information to determine whether or not an event has occurred.\nIn this paper, we will improve RPL in two ways to optimize topology and reduce energy consumption. (1) The neighbor list and\nthe information of DIO sender�s parent of a node are used to construct a better DODAG in the noisy environment. (2) SPRT and\nthe quality of information of the data are used in the event detecting process for saving energy consumption. Simulation results\nshow that, compared with the original RPL, QoI-aware RPL can reduce the energy consumption by collecting the same quality of\ninformation with less data transmission.
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