부산대학교 도서관

5G has attracted attention not only as the next generation of public cellular systems but also as a way to realize the localized and private use of mobile networks, which are called local 5G and micro operators. In order to realize the local 5G, spectrum shared private mobile networks that consist of multiple independent operators are considered. For the efficient use of the dedicated spectrum of local 5G, a spectrum sharing method among multiple independent operators is necessary. As a way of the spectrum sharing, a spatial separation approach which controls transmission power using a measurement-based spectrum database (MSD) has been proposed. However, in a situation that multiple different operator base stations share the same spectrum with a close distance, power control cannot be used for the spectrum sharing because the permissible transmit power is too small and the supported area becomes very small. In this paper, in order to avoid the above problem, we propose a dynamic band allocation for spectrum shared private mobile networks using prior measured channel quality indicator (CQI) information. In the proposed method, resources required for a target user equipment (UE) is calculated, and along with that, the spectrum bandwidth to multiple operators is allocated dynamically. From numerical results, it is shown that the proposed method can keep satisfying the capacity requirement of the target UE compared to the fixed bandwidth division operation.