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The authors present a power-efficient scheme to deliver time sensitive data packets in sensor networks. Data generated by sensors are frequently time sensitive in applications such as hazard monitoring systems, traffic controlling systems and battlefield commanding systems. Such data are associated with end-to-end deadlines, within which they must reach the base station. They make two contributions in this work. First, the authors propose a novel load-balanced routing scheme that distributes data packets evenly among the nodes relaying data towards the base station, avoiding bottlenecks and increasing the likelihood that packets will meet their deadlines. Second, they propose a method of grouping smaller packets into larger ones by delaying data transmissions at the relaying nodes whenever slack times are positive.
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