5G NR PHYSICAL LAYER DESIGN
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JUNE 27, 2017 ✱ ERICSSON TECHNOLOGY REVIEW
neorks and the addition of a new, globally
standardized radio access technology known as
New Radio (NR).
Change to 5G New Radio
5G NR will operate in the frequency range
from below 1GHz to 100GHz with different
deployments. There will pically be more coverage
per base station (macro sites) at lower carrier
frequencies, and a limited coverage area per base
station (micro and pico sites) at higher carrier
frequencies. To provide high service quali and
optimal reliabili, licensed spectrum will continue
to be the backbone of the wireless neork in 5G,
and transmission in unlicensed spectrum will be
used as a complement to provide even higher data
rates and boost capaci. The overall vision for 5G
in terms of use cases, operating frequencies and
deployments is shown in
Figure
.
The standardization of NR started in 3GPP in
April 2016, with the aim of making it commercially
available before 2020. 3GPP is taking a phased
approach to dening the 5G specications. A
rst standardization phase with limited NR
functionali will be completed by 2018, followed by
a second standardization phase that fullls all the
requirements of IMT-2020 (the next generation of
mobile communication systems to be specied by
ITU-R) by 2019. It is likely that NR will continue to
evolve beyond 2020, with a sequence of releases
including additional features and functionalities.
Although NR does not have to be backward
compatible with LTE, the future evolution of NR
should be backward compatible with its initial
release(s). Since NR must support a wide range
of use cases – many of which are not yet dened –
forward compatibili is of utmost importance.
NR physical layer design
A physical layer forms the backbone of any wireless
technology. The NR physical layer has a exible
and scalable design to support diverse use cases
with extreme (and sometimes contradictory)
requirements, as well as a wide range of frequencies
and deployment options.
THE NR PHYSICAL
LAYER HAS A FLEXIBLE
AND SCALABLE DESIGN
TO SUPPORT DIVERSE
USE CASES
Terms and abbreviations
BPSK – binary phase shift keying | BS – base station | CDM – code division multiplexing | CPE – common phase error |
CP-OFDM – cyclic prefix orthogonal frequency division multiplexing | CSI-RS – channel-state information reference
signal | D2D – device-to-device | DFT-SOFDM – discrete Fourier transform spread orthogonal frequency division
multiplexing | DL – downlink | DMRS – demodulation reference signal | eMBB – enhanced mobile broadband |
eMBMS – evolved multimedia broadcast multicast service | FDM – frequency division multiplexing | HARQ – hybrid
automatic repeat request | IMT-2020 – the next generation mobile communication systems to be specified by ITU-R |
IoT – Internet of Things | ITU-R – International Telecommunication Union Radiocommunication Sector | LBT – listen-
before-talk | LDPC – low-density parity-check | MBB – mobile broadband | MIMO – multiple-input, multiple-output |
mMTC – massive machine-type communications | mmWave – millimeter wave | MU-MIMO – multi-user MIMO |
NR – New Radio | PRB – physical resource block | PTRS – phase-tracking reference signal | QAM – quadrature amplitude
modulation | QPSK – quadrature phase shift keying | SRS – sounding reference signal | TDM – time division multiplexing
| UE – user equipment | UL – uplink | URLLC – ultra-reliable low-latency communications
Desinng
for te futue