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This paper proposes a new approach to the closed-loop power control algorithm with decision feedback, called NAPC-DF algorithm. In this algorithm, the step size of the transmitting power by the mobile station (MS) in uplink channel is variable and adjusted by the received command from the base station (BS) and channel conditions. This algorithm is compared with fixed-step, variable step and adaptive step closed-loop power control with decision feedback (FSPC-DF, VSPC-DF and ASPC-DF, respectively). Numerical results indicate that NAPC-DF algorithm, under fading can significantly improve the radio network capacity without any increase in power control signaling. Also the speed of convergence and stability against loop delay can be increased and it decreases the outage probability and bit error rate (BER) of uplink channel in compared with the mentioned references algorithms.