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This paper analyses Fractional Frequency Reuse (FFR) for Real Time (RT) traffic in an OFDMA cellular networks such as Long Term Evolution (LTE) and Worldwide interoperability for Microwave Access (WiMAX). In these networks, frequency reuse factor of unity is usually considered. In the forward link i.e., in downlink, although frequency reuse one provides higher capacity than other reuse factors, yet it severely affects the Signal to Interference plus Noise Ratio (SINR) of the users at the cell edge. This leads to very poor throughput for cell edge users. To enhance the cell edge performance, FFR is one of the methods being considered. The impact of SINR threshold and bandwidth partitioning ratio on the successful deployment of FFR is presented in this work. Analytical and simulation results show that the proposed Grade of Service (GoS) fair method performs better and is good choice for Real Time traffic.