Understanding link dynamics in wireless sensor networks with dynamically steerable directional antennas
2013 (English)In: Wireless Sensor Networks: EWSN 2013, Springer Berlin/Heidelberg, 2013, 115-130 p.Conference paper (Refereed)
By radiating the power in the direction of choice, electronically-switched directional (ESD) antennas can reduce network contention and avoid packet loss. There exists some ESD antennas for wireless sensor networks, but so far researchers have mainly evaluated their directionality. There are no studies regarding the link dynamics of ESD antennas, in particular not for indoor deployments and other scenarios where nodes are not necessarily in line of sight. Our long-term experiments confirm that previous findings that have demonstrated the dependence of angle-of-arrival on channel frequency also hold for directional transmissions with ESD antennas. This is important for the design of protocols for wireless sensor networks with ESD antennas: the best antenna direction, i.e., the direction that leads to the highest packet reception rate and signal strength at the receiver, is not stable but varies over time and with the selected IEEE 802.15.4 channel. As this requires protocols to incorporate some form of adaptation, we present an intentionally simple and yet efficient mechanism for selecting the best antenna direction at run-time with an energy overhead below 2 standard omni-directional transmissions.
Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2013. 115-130 p.
, Lecture Notes in Computer Science, ISSN 0302-9743 ; 7772
IdentifiersURN: urn:nbn:se:uu:diva-198566DOI: 10.1007/978-3-642-36672-7_8ISBN: 978-3-642-36671-0OAI: oai:DiVA.org:uu-198566DiVA: diva2:616961
10th European Conference, EWSN 2013, February 13-15, Ghent, Belgium