6th International ICST Conference on Broadband Communications, Networks, and Systems

Research Article

Energy-Efficient Medium Access for Wireless Sensor Networks under Slow Fading Conditions

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  • @INPROCEEDINGS{10.4108/ICST.BROADNETS2009.7554,
        author={Changmian Wang and Liuguo Yin and Geir E. \`{U}ien},
        title={Energy-Efficient Medium Access for Wireless Sensor Networks under Slow Fading Conditions},
        proceedings={6th International ICST Conference on Broadband Communications, Networks, and Systems},
        publisher={IEEE},
        proceedings_a={BROADNETS},
        year={2009},
        month={11},
        keywords={Access protocols Collision avoidance Energy efficiency Fading Media Access Protocol Multiaccess communication Wireless application protocol Wireless communication Wireless sensor networks ZigBee},
        doi={10.4108/ICST.BROADNETS2009.7554}
    }
    
  • Changmian Wang
    Liuguo Yin
    Geir E. Øien
    Year: 2009
    Energy-Efficient Medium Access for Wireless Sensor Networks under Slow Fading Conditions
    BROADNETS
    IEEE
    DOI: 10.4108/ICST.BROADNETS2009.7554
Changmian Wang1,*, Liuguo Yin2,*, Geir E. Øien1,*
  • 1: lET Department, NTNU, Trondheim, Norway
  • 2: School of Aerospace, Tsinghua University, Beijing, China
*Contact email: changmia@iet.ntnu.no, yinlg@tsinghua.edu.cn, oien@iet.ntnu.no

Abstract

In this work, we first study and then propose an optimal version on the medium access control mechanism known as carrier sense multiple access with collision avoidance (CSMA/CA). This protocol is adopted by many wireless communication standards, such as the IEEE 802.11 series and IEEE 802.15.4 (ZigBee). We first identify its drawbacks in a slow fading channel environment, and show that the CSMA/CA can be very energy-inefficient, especially in many wireless sensor network (WSN) applications where the traffic demand is low. In particular, we study communication over a Rayleigh fading channel, which we model by means of a time invariant Markov process. We then show that the decision regarding the optimal access time on such a channel can be formulated as an optimization problem, and that an optimal solution can be accurately derived. We also simulate a ZigBee node in a Rayleigh fading environment and the result shows that optimum channel access can save significant amount of energy compared to conventional CSMA/CA.