Subcarrier Allocation for Multicell Multicarrier In-Band Full Duplex Cellular Networks

Abstract

In-Band Full Duplex (IBFD) communication in wireless networks is one of the promising technology to improve the spectral efficiency. Due to practical hardware limitations in IBFD to cancel the self interference, only base stations (BSs) are capable of Full Duplex (FD) communication while users remains Half Duplex (HD). Thus, only one user is capable to use the subcarrier for uplink (UL) while the other can use it for downlink (DL), resulting in intracell interference between UL and DL user. However, in case of multicell cellular system, by assigning same subcarrier to UL, DL communication results in Inter Cell Interference (ICI). In this paper, we form a subcarrier and power allocation problem in a multicell full duplex OFDMA cellular system which is non convex and very difficult to solve. In case of single cell systems, we provide an approach for subcarrier allocation by using the Hungarian Algorithm (HA) and then with a low-complexity subcarrier assignment scheme. Later, we employ the concepts of cell sectorization, and frequency reuse (FR) to address the proposed subcarrier and power allocation problem for multicell wireless networks to minimize the ICI on each transmission that should maximize the over all sum rate performance in a multicell system. Our numerical results for a single cell reveal that the suggested algorithms outperform the currently used techniques, while in a multicell the suggested subcarrier allocation algorithms perform better under various scenarios.