Low-power wireless devices must keep their radio
transceivers off as much as possible to reach a low power
consumption, but must wake up often enough to be able to
receive communication from their neighbors. This report
describes the ContikiMAC radio duty cycling mechanism,
the default radio duty cycling mechanism in Contiki 2.5,
which uses a power efficient wake-up mechanism with
a set of timing constraints to allow device to keep their
transceivers off. With ContikiMAC, nodes can participate
in network communication yet keep their radios turned
off for roughly 99% of the time. This report describes the
ContikiMAC mechanism, measures the energy consumption
of individual ContikiMAC operations, and evaluates
the efficiency of the fast sleep and phase-lock optimizations
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