Single-cell Dynamic Duplex Cellular System Using Distributed Receive-only Base Stations

In-band full-duplex (IBFD), which ideally leads to a doubling of spectral efficiency, has been attracting much attention as a promising technology for the beyond 5G and 6G cellular systems. As a method for introducing IBFD to cellular systems, the dynamic duplex cellular (DDC) system has been proposed. In the DDC system, IBFD is applied if it does not degrade the quality of existing half-duplex (HD) communications. However, the conventional DDC system has not established sufficient improvement of user throughput due to the residual self-interference (SI) at the base station (BS). In this paper, we propose a DDC system with distributed receive-only base stations based on the concept of distributed antenna systems to reduce the impact of the SI. In the proposed system, the radio unit (RU) of the BS is separated into transmit-only RU (TRU) and receive-only RU (RRU), and the TRU and multiple RRUs are spatially distributed in the cell. The effectiveness by the proposed system is evaluated by computer simulation in the single-cell environment.