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Symmetry 2017, 9(10), 209;

Reliability Improved Cooperative Communication over Wireless Sensor Networks

School of Information Science and Engineering, Central South University, Changsha 410083, China
Department of Computer Science, Stony Brook University, New York, NY 11794, USA
School of Software, Central South University, Changsha 410075, China
Author to whom correspondence should be addressed.
Received: 15 August 2017 / Revised: 18 September 2017 / Accepted: 22 September 2017 / Published: 1 October 2017
(This article belongs to the Special Issue Applications of Internet of Things)
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With the development of smart devices and connection technologies, Wireless Sensor Networks (WSNs) are becoming increasingly intelligent. New or special functions can be obtained by receiving new versions of program codes to upgrade their software systems, forming the so-called smart Internet of Things (IoT). Due to the lossy property of wireless channels, data collection in WSNs still suffers from a long delay, high energy consumption, and many retransmissions. Thanks to wireless software-defined networks (WSDNs), software in sensors can now be updated to help them transmit data cooperatively, thereby achieving more reliable communication. In this paper, a Reliability Improved Cooperative Communication (RICC) data collection scheme is proposed to improve the reliability of random-network-coding-based cooperative communications in multi-hop relay WSNs without reducing the network lifetime. In WSNs, sensors in different positions can have different numbers of packets to handle, resulting in the unbalanced energy consumption of the network. In particular, nodes in non-hotspot areas have up to 90% of their original energy remaining when the network dies. To efficiently use the residual energy, in RICC, high data transmission power is adopted in non-hotspot areas to achieve a higher reliability at the cost of large energy consumption, and relatively low transmission power is adopted in hotspot areas to maintain the long network lifetime. Therefore, high reliability and a long network lifetime can be obtained simultaneously. The simulation results show that compared with other scheme, RICC can reduce the end-to-end Message Fail delivering Ratio (MFR) by 59.4%–62.8% under the same lifetime with a more balanced energy utilization. View Full-Text
Keywords: wireless sensor networks; cooperative communications; adaptive transmitting power; message fail delivering ratio (MFR); network lifetime wireless sensor networks; cooperative communications; adaptive transmitting power; message fail delivering ratio (MFR); network lifetime

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Chen, Z.; Ma, M.; Liu, X.; Liu, A.; Zhao, M. Reliability Improved Cooperative Communication over Wireless Sensor Networks. Symmetry 2017, 9, 209.

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