ESRT: event-to-sink reliable transport in wireless sensor networks
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Wireless Sensor Networks: Architectures and Protocols
Wireless Sensor Networks: Architectures and Protocols
IEEE 802.15.4 Low-Rate Wireless Personal Area Networks: Enabling Wireless Sensor Networks
IEEE 802.15.4 Low-Rate Wireless Personal Area Networks: Enabling Wireless Sensor Networks
Cross-layer activity management in an 802-15.4 sensor network
IEEE Communications Magazine
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We investigate the performance of probabilistic activity management in a sensor network formed by two interconnected 802.15.4 clusters operating in beacon enabled, slotted CSMA-CA mode. The coordinators are always active, while the ordinary nodes are power managed using Bernoulli scheduling of the duration of sleep and service periods. The coordinator of one cluster switches periodically to the other cluster and out of it, thus performing the bridging function. The delivery of data to the network sink is accomplished either using the CSMA-CA mechanism, or through guaranteed time slots (GTS). We develop the queueing model of this network, including the MAC and physical layer, and analyze its performance. While the packet delays and throughput in the CSMA-CA regime are comparable to that obtained with GTS access, the latter is preferable on account of the more balanced power consumption between the two clusters, thus extending the useful lifetime of the entire network.