Copyright © 2013 NTT DOCOMO, INC. All Rights Reserved.

N－8

Real-time simulator for Future Radio Access (FRA) technologies

Introduction to Future Radio Access (FRA) Technologies

■ FRA concept provides a total solution and a set of technologies to achieve lower network cost and higher system performance (including higher capacity and user data rate), both essential for the support of better quality of user experience (QoE) via the provision of more and advanced services; e.g., higher resolution video streaming and cloud services in the future.

Features

Application Scenarios

NTT Group Global Advantage The establishment of the evolution vision and concept of future radio access is important to ensure further enhancements of mobile communication systems to respond to the challenges of the 2020 era and maintain NTT DOCOMO global R&D leadership.

Toward both the mid-term and the long-term evolution (up to the 2020 era) of currently deployed Long Term Evolution (LTE), NTT DOCOMO’s future concept for Future Radio Access (FRA) is introducted. In particular, key FRA technologies are presented and demonstrated using a real-time simulator to clarify their use image and potential performance under various setups and environments.

Convergence network

High-capacity networks

Spectrum extension and network densification

Large-scale MU-MIMOwith opportunistic precoding

3D/Massive MIMO

e.g., more than100 antenna elements

Multi-antenna IRC

Desired signal

Interference signals

Multi-antenna IRC

Desired signal

Interference signals

Tx/Rx cooperation

Massiveconnected users

Interference cancelling multiple access w/ dynamic power allocation

Spectrum efficiency enhancements

Non-orthogonal multiple access: NOMA

■ The potential performance gains of applying the following key FRA technologies are demonstrated in real-time: - Efficient exploitation of higher frequency bands using small

cells (e.g., the effect of spectrum extension and network densification)

- Large scale MIMO/Massive 3D MIMO - Non-orthogonal multiple access (NOMA) - Multi-antenna advanced receiver (e.g., IRC) (2Rx 4Rx) - Higher order modulation: 256QAM

Combined usage of low frequency bands for coverage and higher frequency bands for higher data rate

Spectrum extension

Future required performance

Current performance

Traffic offloading

Spe

ctru

mef

ficie

ncy

Frequency

Very wide (e.g. > 3 GHz)

Super wide (e.g. > 10 GHz)

Higher frequency bands (wider bandwidth for high data rate)

Existing cellular bands (high power density for coverage)

Radio resource allocation

Non-orthogonal (NOMA) OFDMA + Superposition/Cancellation

Multiple access image f

Superposition & interference cancellation Multi-antenna IRC

Desired

signal

Spectrum extension

Spe

ctru

m e

ffici

ency

Traffic offloading

Interference signals