Assume a network of sensor that periodically transmit some data. The period T is the same for all the sensors. Assume also that the time required to tranmsit a packet is much shorter than the period Tx << T. Then we propose a MAC protocol that, in case of collision, re-attempt transmission after a random period of time R, Tx<< R << T. After a successful transmission, the sensor delays exactly T the new transmission attempt.
After the learning period, the system will operate collision-free. Further, each node will transmit deterministically each T seconds. The receiver can sleep for most of the time, and only wake up when it knows that there will be an incoming packet.
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