Sensor Systems and Software. First International ICST Conference, S-CUBE 2009, Pisa, Italy, September 7-9, 2009, Revised Selected Papers

Research Article

Accurate Analysis of IEEE 802.15.4 Slotted CSMA/CA over a Real-Time Wireless Sensor Network

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  • @INPROCEEDINGS{10.1007/978-3-642-11528-8_8,
        author={Wen-Tzeng Huang and Jing-Ting Lin and Chin-Hsing Chen and Yuan-Jen Chang and You-Yin Chen},
        title={Accurate Analysis of IEEE 802.15.4 Slotted CSMA/CA over a Real-Time Wireless Sensor Network},
        proceedings={Sensor Systems and Software. First International ICST Conference, S-CUBE 2009, Pisa, Italy, September 7-9, 2009, Revised Selected Papers},
        proceedings_a={S-CUBE},
        year={2012},
        month={5},
        keywords={Real-time wireless sensor network collision IEEE 802.15.4 CSMA/CA},
        doi={10.1007/978-3-642-11528-8_8}
    }
    
  • Wen-Tzeng Huang
    Jing-Ting Lin
    Chin-Hsing Chen
    Yuan-Jen Chang
    You-Yin Chen
    Year: 2012
    Accurate Analysis of IEEE 802.15.4 Slotted CSMA/CA over a Real-Time Wireless Sensor Network
    S-CUBE
    Springer
    DOI: 10.1007/978-3-642-11528-8_8
Wen-Tzeng Huang1,*, Jing-Ting Lin2,*, Chin-Hsing Chen3,*, Yuan-Jen Chang3,*, You-Yin Chen4,*
  • 1: Minghsin University of Science & Technology
  • 2: National Taipei University of Technology
  • 3: Central Taiwan University of Science and Technology
  • 4: National Chiao Tung University
*Contact email: wthuang@must.edu.tw, kq13kq13@yahoo.com.tw, chchen@ctust.edu.tw, ronchang@ctust.edu.tw, kenchen@cn.nctu.edu.tw

Abstract

Here, we present the collision probability of the IEEE 802.15.4 slotted Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) mechanism over a real-time wireless sensor network (RT-WSN), also called a synchronous network system. The “backoff,” the random delay of CSMA/CA, can be used to create a probability model and to determine the average packet delay over RT-WSN. The proposed theoretical analysis model was nearly consistent with the simulation and with experimental results. This suggests that the slotted CSMA/CA mechanism cannot be applied effectively to RT-WSN because it cannot avoid a high collision rate with RT-WSN application requirements and, therefore, may waste a great deal of system bandwidth. We found that the packet collision rate increased up to 731% compared to an ideal model with more than 10 users within an RT-WSN. Without improvements in methodology, the high collision rate makes this slotted CSMA/CA mechanism unsuitable for RT-WSN applications.