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