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.
|Title of host publication||EWSN 2010: Wireless Sensor Networks|
|Number of pages||17|
|Place of Publication||Berlin|
|Publication status||Published - 26.04.2010|
|Event||7th European Conference on Wireless Sensor Networks - Coimbra, Portugal|
Duration: 17.02.2010 → 19.02.2010
Conference number: 79931