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A Hybrid Link Quality Assessment for IEEE802.15.4 based Large-scale Multi-hop Wireless Sensor Networks  

Lee, Sang-Shin (U-Embedded Convergence Research Center, KETI, Hankuk University of Foreign Studies)
Kim, Joong-Hwan (Hankuk University of Foreign Studies)
Kim, Sang-Cheol (Hankuk University of Foreign Studies)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.48, no.4, 2011 , pp. 35-42 More about this Journal
Abstract
Link quality assessment is a crucial part of sensor network formation to stably operate large-scale wireless sensor networks (WSNs). A stability of path consisting of several nodes strongly depends on all link quality between pair of consecutive nodes. Thus it is very important to assess the link quality on the stage of building a routing path. In this paper, we present a link quality assessment method, Hybrid Link Quality Metric (HQLM), which uses both of LQI and RSSI from RF chip of sensor nodes to minimize set-up time and energy consumption for network formation. The HQLM not only reduces the time and energy consumption, but also provides complementary cooperation of LQI and RSSI. In order to evaluate the validity and efficiency of the proposed method, we measure PDR (Packet Delivery Rate) by exchanging multiple messages and then, compare PDR to the result of HQLM for evaluation. From the research being carried out, we can conclude that the HQLM performs better than either LQI- or RSSI-based metric in terms of recall, precision, and matching on link quality.
Keywords
Link Quality; LQI; RSSI; Multi-hop; WSN;
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