NTT DOCOMO released its white paper on 5G, the fifth-generation mobile communications system that the company plans to launch on a commercial basis in 2020, the landmark year when Tokyo will host the Summer Olympic and Paralympic Games. The paper shares DOCOMO's views on the technical requirements, evolution concept and candidate technologies for 5G radio access.
DOCOMO is keenly developing 5G, targeting data speeds of more than 10Gbps and 1,000 times the capacity of today's LTE, to cope with the rapid increase of smartphone data traffic and to address the future surge of machine-to-machine (M2M) communications and the Internet of Things (IoT) in a more interconnected world.
DOCOMO's white paper, by proposing promising 5G technologies to a wide range of stakeholders in the mobile communications industry and research community, is aimed at promoting 5G global activities and discussions based on the technical content presented in the paper. Examples of the technical components include hybrid usage of lower and higher frequency bands based on the Phantom Cell concept, non-orthogonal multiple access (NOMA) and massive MIMO.
- Phantom Cell?
An enabler of inter-cell collaboration in a multi-layer architecture, with small cells being overlaid over a macro cell. Specifically, the control plane and user data plane (C/U) split is used to transmit U-plane and C-plane from different cells on different frequency bands.
- Non-orthogonal multiple access (NOMA)?
Transmission technology to multiplex signals designated to multiple users. NOMA makes use of the power domain, not sufficiently utilized in the past, to multiplex multiple users and rely on the improved signal processing capability of the receiver to cancel inter-user interference.
- Massive MIMO?
A large number of antenna elements are arranged in horizontal and vertical dimensions of an antenna to improve its performance and provide stable, high-speed data transmission even in higher frequency bands.
Last year, 5G discussions gained momentum at several research organizations and international conferences. DOCOMO began studying 5G requirements, concept and candidate technologies from 2010. Since then, DOCOMO has been contributing to 5G-related global pre-standardization alliances and initiatives to advance the technical concepts and candidate technologies for 5G deployments.
To download "DOCOMO 5G White Paper -- 5G Radio Access: Requirements, Concept and Technologies":
The Japanese version of the white paper will be available on September 12.