Adaptive frequency reuse in two-hop cellular system with fixed relay nodes

In this paper we investigate dynamic frequency reuse scheme for cellular system enhanced with two-hop fixed relay station (RS). Frequency reuse can increase spectrum efficiency. However, it will also introduce more interference. In order to reuse more frequency resources with satisfactory quality of service (QOS), we propose an adaptive frequency reuse scheme according to the desired interference level. Both inter-cell and intra-cell reuse are considered. No interference measurement is needed, the signaling overhead is reduced. Numerical results show that in our proposed scheme the signal to interference ratio (SIR) performance on the cell edge is improved significantly, the spectrum efficiency is also increased.