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We present a rendezvous based medium access control (MAC), called ArDeZ,
for use in sensor networks. ArDeZ is a TDMA based medium access scheme
that does not rely on strict time slot positioning and assignments, making
ArDeZ easily deployable in large sensor networks without having to adhere to
strict time slot boundary. ArDeZ establishes two independent peer-to-peer
time channels between nodes, and these channels do not necessarily have
the same transmission rate. Each channel has a set of rendezvous periods
associated with it that are generated from a seed exchanged during the
setup process. Further, the duration and frequency of each channel's
rendezvous periods are easily changed by an application for each link
on a given path, thereby allowing the application to balance traffic and
energy requirements. We have implemented ArDeZ in the {\it ns-2} simulator,
and our results show that ArDeZ is capable of very low power consumption.
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