Orthogonal Frequency Division Multiplexing (OFDM) is a technique, which is widely used in 4G and considered in 5G wireless communication system these days. It is a form of multi-carrier modulation technique. One major disadvantage of OFDM is that the time domain OFDM signal leads to a high peak-to-average power ratio (PAPR). In this paper we propose a new selective tone reservation (STR) algorithm for reducing the PAPR in downlink channel of base station. We simulate the STR for different application scenarios with consideration of 4G/5G requirements. Simulation results show the STR has a PAPR reduction performance much better compared with all traditional methods in that it doesn't require any side information and has no effect on the performance of high order modulation users. Proposed method is fast and has an ultra-low latency compared with well-known iterative methods of tone reservation and constellation extension. Its performance is higher compared with a common clipping and filtering due to employing a constellation recognition technique for blind detection of the modulation order. STR fully fits in 4G/5G standard requirements and its complexity doesn't require a huge computational resources.