Abstract: “In this paper, resource allocation for heterogeneous downlink is studied in orthogonal frequency division multiple access (OFDMA) systems unicasting by multiple base stations (BSs). First, this paper formulates the resource allocation problem which is designed to maximize the sum rate of non-real time transmission while satisfying the quality-of-service (QoS) requirement of both the real time and non-real time transmission. In the considered scenario, each user is restricted to being covered by one BS, while each subcarrier is assigned to at most one user. Furthermore, due to frequency reuse in long term evolution (LTE) lead to unacceptable interference levels experienced by user equipment that is very far from its serving BS in a multi-cellular system. The herein proposed dynamic fractional frequency reuse scheme is a step forward towards effective inter-cell interference coordination in wireless networks. Simulations demonstrate that the proposed method provides a comparable performa”

Keywords: resource allocation, heterogeneous, orthogonal frequency