System-level performance evaluation of multicell two-way relay networks with fractional frequency reuse

Two-way relaying has been known to double the spectral efficiency of the one-way relaying scheme in a single cell system. In this paper, we observe a unique intercell interference issue which is caused when employing the two-way relaying in a multicell system. To circumvent this uplink interference problem, we consider a fractional frequency reuse. We evaluate the performance of the decode-and-forward two-way relaying in the orthogonal frequency division multiplexing multicell two-way relay network. In particular, the direct communication without relaying is also taken into account for the cell-center sector. Under this scenario, relay parameters such as the transmit power and position are optimized through numerical simulations to maximize the cell-throughput. In the simulations, a practical environment is considered, such as non-zero transition beam width for the cell-sectorization.