An adaptive collision resolution scheme for energy efficient communication in IEEE 802.15.4 networks

Authors:
Kyoung-Hak Jung;Hyo-Ryun Lee;Wan-Seon Lim;Young-Joo Suh
Affiliations:
Department of Computer Science and Engineering , Pohang University of Science and Technology (POSTECH), South Korea;Division of IT Convergence Engineering (ITCE), Pohang University of Science and Technology (POSTECH), South Korea;Real-Time Computing Laboratory, Department of Electrical Engineering and Computer Science, The University of Michigan, United States;Department of Computer Science and Engineering , Pohang University of Science and Technology (POSTECH), South Korea and Division of IT Convergence Engineering (ITCE), Pohang University of Science ...
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2014

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Abstract

IEEE 802.15.4 provides a widely accepted solution for low-cost and low-power wireless communications, and it is known to be applicable to many types of WSN application scenarios. To enhance energy efficiency and throughput of sensor nodes, many CSMA/CA schemes based on IEEE 802.15.4 have been proposed. However, they still suffer from unnecessary waste of energy and bandwidth due to inefficient backoff management. In order to overcome these problems, we propose an enhancement to existing schemes, called adaptive collision resolution (ACR). ACR appropriately adapts backoff exponent (BE) to the current network contention level based on physical and link-layer measurements. In addition, it adjusts backoff periods (BP) to avoid meaningless backoffs and additional clear channel assessments (CCAs) by using the estimated time remaining until the channel becomes idle. To verify the feasibility and applicability of our scheme, we studied mathematical analysis and tested it on the Matlab and USRP/GNU Radio testbed. We also performed simulation study using OPNET, and our simulation results indicate that ACR shows improved energy efficiency and throughput performance over existing schemes.