Making sensornet MAC protocols robust against interference

  • Authors:
  • Carlo Alberto Boano;Thiemo Voigt;Nicolas Tsiftes;Luca Mottola;Kay Römer;Marco Antonio Zúñiga

  • Affiliations:
  • Institut für Technische Informatik, Universität zu Lübeck, Lübeck, Germany;Swedish Institute of Computer Science (SICS), Kista, Sweden;Swedish Institute of Computer Science (SICS), Kista, Sweden;Swedish Institute of Computer Science (SICS), Kista, Sweden;Institut für Technische Informatik, Universität zu Lübeck, Lübeck, Germany;Digital Enterprise Research Institute (DERI), Galway, Ireland

  • Venue:
  • EWSN'10 Proceedings of the 7th European conference on Wireless Sensor Networks
  • Year:
  • 2010

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Abstract

Radio interference may lead to packet losses, thus negatively affecting the performance of sensornet applications. In this paper, we experimentally assess the impact of external interference on state-of-the-art sensornet MAC protocols. Our experiments illustrate that specific features of existing protocols, e.g., hand-shaking schemes preceding the actual data transmission, play a critical role in this setting. We leverage these results by identifying mechanisms to improve the robustness of existing MAC protocols under interference. These mechanisms include the use of multiple hand-shaking attempts coupled with packet trains and suitable congestion backoff schemes to better tolerate interference. We embed these mechanisms within an existing X-MAC implementation and show that they considerably improve the packet delivery rate while keeping the power consumption at a moderate level.