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Effective techniques for extending lifetime in multi-hop Wireless Sensor Networks (WSNs) include duty cycling and more recently introduced cooperative transmission range extension. However a scalable MAC protocol has not been presented that combines both. In this paper, the authors present a new Scheduling Co-operaTive MAC protocol (SCT-MAC) for the multi-hop wireless sensor network, which introduces distributed duty-cycle scheduling and enables nodes to wake up on demand in the data period. The protocol provides a wake-up rendezvous for cooperators to reach a CT agreement and reduces contention over adjacent flows, and the on-demand wake-up further reduces idle listening in the data period.
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