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Data communication in sensor networks can have timing constraints like end to end deadlines. If the deadlines are not met either a catastrophe can happen in hard real time systems or performance deterioration can occur in soft real time systems. In real time sensor networks, the recovery of data through retransmission should be minimized due to the stringent requirements on the worst case time delays...
We 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. We make two contributions in this work...
This paper proposes isochronous-MAC (I-MAC), which utilizes low-frequency radio waves time synchronization for sensor networks. Using IMAC, based on the low power listening (LPL), all sensor nodes wake and listen channel periodically and synchronously. Since a sender can easily predict wakeup time of an intended receiver, it can shorten the length of preamble to make the receiver prepare for reception...
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