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3Cooperative control system design and verificationTo eectively utilize microcells, it is necessary to pro-vide devices with operational information about microcells operating in a limited part of a private area, including their location, frequency, and communication performance; in addition, devices must be able to select and connect to them appropriately when needed. To achieve this, we propose a system that enables devices to use microcells eectively by providing cellular mobile operators with microcell operational information from microcell mobile operators and using cellular mobile operators’ macrocells — with their extensive communication range — to broad-cast that operational information.We will examine the feasibility of the proposed system based on 3GPP standards and identify the technical chal-lenges. In doing so, it will be necessary to actually create the requisite functions based on 3GPP standards in order to evaluate performance, but as the standards for 5G are still under discussion and have yet to be nalized, we de-cided to test the proposed system based on the 4G stan-dards. While conducting these tests, we will make proposals for the functions required of 5G.3.1Outline of the proposed systemFigure 3 provides an outline of the proposed system. It uses the Cell Broadcast Service (CBS) prescribed by 3GPP as a means of transmitting information about the microcells operated by microcell mobile operators. e Microcell Operator Manager (MOM) is a component not prescribed by 3GPP, so we have dened it for the rst time. We assume the MOM to be an item of equipment operated by micro-cell mobile operators. e function of the MOM is to no-tify the Cell Broadcast Entry (CBE) of operational information concerning microcells operated by microcell mobile operators. As described below, this operational in-formation consists of parameters such as frequency, chan-nel number, and location. is is based on the assumption that each microcell has dierent operational information. e operational information is broadcast to devices from the cellular mobile operator’s eNodeB via the CBE and CBC. e device selects the microcell mobile operator and cell based on that information and connects to the cell[10].e CBS is created by the Cell Broadcast Center (CBC) and the CBE. Examples of use include earthquake early warning using the Earthquake and Tsunami Warning System (ETWS) prescribed by 3GPP[11][12]. In that case, the Japan Meteorological Agency’s earthquake information distribution server, for example, would be the CBE, while the information distribution servers of mobile operators would be the CBCs. e CBC species that the information provided by the CBE should be transmitted through the MME by the applicable eNodeB cells.e relevant cells can be specied on the basis of cell IDs, which are identiers for cells under the eNodeB; Tracking Area Identiers (TAIs), which are device location registration units; or Emergency Areas (EAs), which are areas that can be arbitrarily dened by the mobile operator.3.2System architecture and control informationFigure 4 shows the proposed system architecture. A cellular mobile operator is composed of a Home Subscriber Server (HSS), a Mobility Management Entity (MME), a Packet Data Network Gateway (PGW), a Serving Gateway (SGW), an eNodeB, and a CBC. ese are all components FiF3　Cooperation between cellular mobile operators and microcell mobile operatorsCellular Mobile Operator ACellular Mobile Operator BCBCCBCMOMCBETransmission of operational informationDevice connectionMicrocell Mobile OperatorMicrocell Mobile OperatorOperational information (location, cell ID, frequency, bandwidth, cell selection criteria, etc.)eNodeBeNodeBeNodeBeNodeBUEUE72-1 Next Generation Mobile Communications System to Realize Flexible Architecture and Spectrum Sharing