Abseract-Quality of service (QoS) is an one of the application in wireless network.some of the mathematical factors that affect the quality of service of a network.the aim of this paper improving the residual energy in MAC layer using enchanced oar algorithem.To improving of an energy in MAC layer using the function ,inthat one is back-off function. The scaling of back-off function is finding in Contention Window (CW). Distributed Coordination Function (DCF) mode is an changing the contention Window(CW) and Distributed Inter-Frame Space (DIFS) changing frame befor and after sending of data. So based on DCF randomly choose the back-off time from 0 and CW.
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