SCT-MAC: A scheduling duty cycle MAC protocol for cooperative wireless sensor network
Jian Lin, Mary Ann Ingram · 2012
Effective techniques for extending lifetime in multihop 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 study, we present a new scheduling cooperative 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. We compare SCT-MAC with DW-MAC using NS-2 simulation, and show that SCT-MAC improves the network lifetime by approximately 100%.