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A Real-Time Data Transfer Mechanism Considering Link Error Rates in Wireless Sensor Networks  

Choi, Jae-Won (Dept. of Computer Engineering, Changwon National University)
Lee, Kwang-Hui (Dept. of Computer Engineering, Changwon National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.1, 2007 , pp. 146-154 More about this Journal
Abstract
In this paper, we have presented a real-time transfer mechanism for the delay-sensitive data in WSNs (Wireless Sensor Networks). The existing methods for real-time data transfer select a path whose latency is shortest or the number of hops is least. Although the approaches of these methods are acceptable, they do not always work as efficiently as they can because they had no consideration for the link error rates. In the case of transmission failures on links, they can not guarantee the end-to-end real-time transfer due to retransmissions. Therefore, we have proposed an algorithm to select a real-time transfer path in consideration of the link error rates. Our mechanism estimates the 1-hop delay based on the link error rate between two neighboring nodes, which in turn enables the calculation of the expected end-to-end delay. A source node comes to choose a path with the shortest end-to-end delay as a real-time route, and sends data along the path chosen. We performed various experiments changing the link error rates and discovered that this proposed mechanism improves the speed of event-to-sink data transfer and reduces delay jitter. We also found that this mechanism prevents additional energy consumption and prolongs network lifetime, resulting from the elative reduction of transmission failures and retransmissions.
Keywords
WSNs; Wireless Sensor Networks; Routing; Real-Time; Delay;
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Times Cited By KSCI : 1  (Citation Analysis)
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