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We present a practical plant-and-play wireless sensor network system for entry-exit monitoring. Our system is easily configurable and robust, making it feasible to be deployed in a wide range of entry-exit monitoring applications. At the core of our system lies a novel MAC protocol that is self-synchronizing. Notably, our MAC protocol allows the nodes to maintain a very low duty cycle (the radios...
Empirical studies show that wireless sensor networks (WSNs) are extremely prone to the hidden terminal problem. As much as 50% of packet losses have been blamed to the hidden terminal problem under bursty communication. Current protocols use RTS-CTS handshakes to avoid collisions and alleviate the hidden terminal problem for uni- cast communication. However, it is not possible to directly or efficiently...
RTS-CTS handshake based protocols achieve "reliable unicast" by eliminating the hidden node problem effectively, however, these solutions are not directly or efficiently gener- alizablefor solving the "reliable multicast"problem; multicast remains as a best-effort operation in wireless ad hoc networks. Here, we present a simple, light-weight, and self- stabilizing MAC protocol,...
We present a fast, local clustering service, FLOC, that partitions a multihop wireless network into nonoverlapping and approximately equal-sized clusters. Each cluster has a clusterhead such that all nodes within unit distance and some nodes within distance m of the clusterhead belong to the cluster. We show that, by asserting a stretch factor m ges 2, FLOC achieves locality of clustering and fault-local...
RTS-CTS handshake based protocols achieve "reliable unicast" by eliminating the hidden node problem effectively, however, these solutions are not directly or efficiently generalizable for solving the "reliable multicast" problem; multicast remains a best-effort operation in wireless ad hoc networks. Here we present a simple light-weight MAC protocol, namely busy elimination multiple...
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