Understanding packet delivery performance in dense wireless sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Versatile low power media access for wireless sensor networks
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
A Multi-Channel MAC Protocol for Wireless Sensor Networks
CIT '06 Proceedings of the Sixth IEEE International Conference on Computer and Information Technology
An analysis of unreliability and asymmetry in low-power wireless links
ACM Transactions on Sensor Networks (TOSN)
Y-MAC: An Energy-Efficient Multi-channel MAC Protocol for Dense Wireless Sensor Networks
IPSN '08 Proceedings of the 7th international conference on Information processing in sensor networks
A Practical Multi-channel Media Access Control Protocol for Wireless Sensor Networks
IPSN '08 Proceedings of the 7th international conference on Information processing in sensor networks
Propagation measurements and models for wireless communications channels
IEEE Communications Magazine
From theory to practice: an overview of MIMO space-time coded wireless systems
IEEE Journal on Selected Areas in Communications
Proceedings of the Nineteenth International Workshop on Quality of Service
Link quality-based channel selection for resource constrained WSNs
GPC'11 Proceedings of the 6th international conference on Advances in grid and pervasive computing
@scale: insights from a large, long-lived appliance energy WSN
Proceedings of the 11th international conference on Information Processing in Sensor Networks
Multi-channel communication vs. adaptive routing for reliable communication in WSNs
Proceedings of the 11th international conference on Information Processing in Sensor Networks
Computer Standards & Interfaces
The GINSENG system for wireless monitoring and control: Design and deployment experiences
ACM Transactions on Sensor Networks (TOSN)
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We study the utility of dynamic frequency agility in real-world wireless sensor networks. Many view such agility as essential to obtaining adequate reliability in industrial environments. We quantify the actual utility by identifying the two facets of connectivity graphs that yield potential benefits called Multichannel Links (MCLs) and Multichannel Triangles (MCTs), study how frequently these occur empirically and determine whether multihop provides a comparable solution without the complexity of switching channels. We examine connectivity graphs of live networks over each 802.15.4 channel and find that MCLs and MCTs are extremely rare in practice. Almost no MCLs are found in any connectivity graph while MCTs occur between 0-200 parts per million (ppm). Furthermore, we show that MCLs are rarely important for routing while each MCT has a singlechannel routing solution. We also find that there are channels that are always good for connectivity and offer comparable routing costs, with respect to transmission count, in comparison to multichannel communication. Thus, the justification for channel agility in industrial environments applies in the absence but not in the presence of multihop routing.