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In this paper, we present the new energy efficient MAC protocol for WSN, named as medium reservation preamble based MAC (MRPM). Inspired by S-MAC, the proposed MRPM is also a synchronized duty cycle MAC protocol. However, unlike S-MAC, the proposed protocol doesn't have separate time frame for Sync and data traffics. Both traffics are integrated in a short listen period. The listen period is further shortened by excluding the channel contention from listen period and transferring it to new period called contention period. The contention period precedes the listen period, and only transmitters wake up in this contention period and contend for medium reservation, avoiding the receivers from idle listening. Now, with these features, our MRPM is much energy efficient than the conventional synchronized duty cycle MAC protocols. We compared MRPM with S-MAC and TEEM protocols through ns-2 simulation. The simulation results show that MRPM is 55% more energy efficient than S-MAC and 35 % more than TEEM.