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Wii-eless sensor nehvorlu. are usually o collection of Sensor nodes deployed remotely with Iiniited energy resources. Therefore, consemation of energy is one of the highest priorities in a wireless sensor network design. In this paper n'e present enhancements a1 Medium Access Control (MAC) laver to improve energy efficiency. The MAC employs a i~oriablefiume size instead of a usingjixed frame size. which improves energy conservation. A new approach called Extended Kalmair Filter is used to predict the optinlol frame size. 7lfe variable fi-ame size keeps the s\.stem degradation caused by a time vawing wireless channel to minimum. These enhancements are designed to optinfizc the MAC lrryer without losing its fairuess while increasing throughput. Simulations have been conducted wirh different neht,ork scenarios and the results suggest that our approach iniproves energy efficienn. by 5 to 15 %.

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