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prescribed by 3GPP.On the other hand, a microcell mobile operator is composed of an MME, a PGW, an SGW, an eNodeB, and a MOM. As stated above, the MOM is a newly dened component.We assume two situations involving device authentica-tion by the microcell mobile operator: internal authentica-tion by the microcell mobile operator and forwarding of authentication to the cellular mobile operator. Accordingly, while operating its own internal HSS, the microcell mobile operator also connects to the cellular mobile operator’s HSS. e decision about whether to use the internal or external HSS for device authentication is determined on the basis of the USIM ID and mobile operator ID mapping table held by the MME. As a result of this decision, au-thentication is assigned to one or other HSS. e HSS to which the MME connects is not necessarily that of a single cellular mobile operator; there may also be cases in which multiple cellular mobile operators are involved.FiF5　Development of a prototype for evaluating how the proposed system functionsMicrocell Operator Cellular mobile operatorDevices基地局基地局Commercial LTE Module(connected to the PCs by USBs)FiF4　System architecture for transmitting microcell operational information using the Cell Broadcast Service]]]UECBE: CellBroadcastEntity: CellBroadcastCentreCBCInterneteNodeBMMESGWPGWHSSS1-MMES1-US11S6aS5GTPeNodeBMMESGWPGWS1-MMES1-US11S6aS5GTPMicrocell OperatorSGiSGiCBECBCCellular mobile operatorSBcLTE-UuMOM: Microcell Operator ManagerMOMHSSS6a2 Terrestrial Communication Technology Research and Development8　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)