Page 144 - ITU-T Focus Group IMT-2020 Deliverables

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CN A Simplified CN X

A, F1
X, F2
A, F2

Selection

Figure 6.4.6-3 – Connection option 2

In option 2, small cell of the local area operator X is used for data. Macro cell of the large area operator A or
small cell of the local area operator X is used for control information. Selection is based, for example, on
required core network functionality for a specific network slice.
6.4.7 5G3ALT project by ATR

6.4.7.1 Introduction
“Research and development for realizing 5G mobile communications” or 5G3ALT is a four-year project kicked
off in April 2015, that aims to develop technologies for 5G mobile networks. This project is funded by Ministry
of Internal Affairs and Communications (MIC) in Japan and is divided among several research centers,
companies and universities. The basic plan of this project is described in MIC website [Ref. 6.4.7-1]. As a part
of 5G3ALT, Advanced Telecommunications Research Institute international (ATR), Kyoto, Japan, is conducting
“research and development on control schemes for utilizations of multiple mobile communication networks”
[Ref. 6.4.7-2].

The mission of the 5G3ALT project by ATR is to develop a framework so that multiple mobile communications
networks can perform similar to a single network. In addition, the technology of terminals that are capable
of communication in multiband and in multi mobile network environment is to be developed. Such a terminal
would communicate over a link and with a network that can provide the requested services. In the
subsequent subsections, the part of 5G3ALT that is developed in ATR is described.

6.4.7.2 Background and motivation

5G is expected to cover a wide range of use cases with diverse requirements. To achieve this objective, 5G
will take advantage of diverse technologies and various frequency bands. However, it is extremely costly for
a single mobile network operators (MNO) to provide a universal coverage for various applications and
requirements. Network consolidation and virtualization concepts are introduced to realize 5G in a cost-
effective way. Consolidating infrastructure and sharing network resources reduces the cost of providing
various services for MNOs.

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