ESRT: event-to-sink reliable transport in wireless sensor networks
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Avoiding the Bottlenecks in the MAC Layer in 802.15.4 Low Rate WPAN
ICPADS '05 Proceedings of the 11th International Conference on Parallel and Distributed Systems - Workshops - Volume 02
Maintaining Reliability Through Activity Management in 802.15.4 Sensor Networks
Proceedings of the Second International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks
Cross-layer activity management in an 802-15.4 sensor network
IEEE Communications Magazine
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We consider the problem of maintaining the prescribed event sensing reliability in a network formed by two 802.15.4 sensor clusters (child and parent). In order to maximize cluster lifetime, both clusters have redundant sensors which are periodically sent to sleep through distributed activity management. The clusters are connected through a bridge which also takes on the role of the coordinator in one of the clusters. In order to maximize the network lifetime, the lifetime of both clusters should be nearly the same, but the increased contention caused by the bridge reduces the lifetime of the parent cluster. We model this problem analytically and derive the probability distribution of the network lifetime. We also derive the expression for node count in the parent cluster that compensates for the interaction with the bridge. The use of this technique ensures that both clusters have nearly the same lifetime, with all the nodes dying within a short time period centered around the mean lifetime.