Dynamic Channel Access to Improve Energy Efficiency in Cognitive Radio Sensor Networks

Wireless sensor networks operating in the license-free spectrum suffer from uncontrolled interference as those spectrum bands become increasingly crowded. The emerging cognitive radio sensor networks (CRSNs) provide a promising solution to address this challenge by enabling sensor nodes to opportuni...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2016-05, Vol.15 (5), p.3143-3156
Main Authors: Ren, Ju, Zhang, Yaoxue, Zhang, Ning, Zhang, Deyu, Shen, Xuemin
Format: Article
Language:English
Subjects:
Channels
clustering
Cognitive radio
cognitive radio sensor network
Data communication
Data transmission
Detection
dynamic channel access
Dynamics
Energy consumption
energy efficiency
Energy management
Networks
Resource management
Sensors
Switches
Wireless sensor networks
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Summary:Wireless sensor networks operating in the license-free spectrum suffer from uncontrolled interference as those spectrum bands become increasingly crowded. The emerging cognitive radio sensor networks (CRSNs) provide a promising solution to address this challenge by enabling sensor nodes to opportunistically access licensed channels. However, since sensor nodes have to consume considerable energy to support CR functionalities, such as channel sensing and switching, the opportunistic channel accessing should be carefully devised for improving the energy efficiency in CRSN. To this end, we investigate the dynamic channel accessing problem to improve the energy efficiency for a clustered CRSN. Under the primary users' protection requirement, we study the resource allocation issues to maximize the energy efficiency of utilizing a licensed channel for intra-cluster and inter-cluster data transmission, respectively. Moreover, with the consideration of the energy consumption in channel sensing and switching, we further determine the condition when sensor nodes should sense and switch to a licensed channel for improving the energy efficiency, according to the packet loss rate of the license-free channel. In addition, two dynamic channel accessing schemes are proposed to identify the channel sensing and switching sequences for intra-cluster and inter-cluster data transmission, respectively. Extensive simulation results demonstrate that the proposed channel accessing schemes can significantly reduce the energy consumption in CRSNs.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2016.2517618