Abstract
In middle and high rate sensor network (MHWSN) usually contains a large quantity of self-organizing distributed nodes. It can be widely applied in emergency searching, disaster salvation and military applications etc. As middle and high rate sensor network node energy is limited, so energy efficient is the primary issue for Sensor network Medium Access Control (MAC) protocol design. BEB back-off algorithm cause more collision when node is in middle or high rate. A new back-off algorithm named ACW (Adaptive Contention Window) is proposed in this paper, which adjusts the CW based on the number of historical collision. In ACW, the adjustment of CW can properly reflect the state of medium contention, which results in improvements of throughput and reducement delay in MHWSN.
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