NEC Promotes 5G with NTT DOCOMO by Testing Coordination Technology Between Cells
February 22 2018 - 11:59PM
JCN Newswire (English)
NEC Corporation (TSE:6701) today announced the start of
verification experiments(1) to achieve 5G wireless communications
in cooperation with NTT DOCOMO, INC. In these experiments,
coordinated control between Distribution Units (DUs) is being
achieved by using a massive-element Active Antenna System (AAS)
base station system belonging to a Centralized-Radio Access Network
(C-RAN) configuration, enabling a Central Unit (CU) to control
multiple DUs.
In the low super high frequency (SHF(2)) band massive-element AAS
base station system developed by NEC, the CU exchanges information
on terminals connected to different DUs between multiple DUs. DUs
then form directional signals (beams) while performing coordination
control between DUs. This greatly improves the throughput of
terminals located near the boundary of DUs' communication ranges
(cells) when compared to conventional throughput and achieves
stable, high-quality communication regardless of location.
http://www.acnnewswire.com/topimg/Low_NECLowSHFBand.jpg
Low SHF band massive-element AAS used in the experiments
http://www.acnnewswire.com/topimg/Low_NECVerificationExperiment.jpg
Verification experiment
Currently, when adjacent terminals are located near the
communication range boundary of several DUs and each DU forms a
beam independently for each terminal communicating with the DU, the
quality of communication decreases, including reduced video
download speeds due to radio wave interference between the DUs. For
5G, where cells are arranged more densely, it is believed that
interference between DUs will become a major challenge.
In these verification experiments, under a range of conditions,
such as suburbs and city centers, the quality of downstreaming is
being measured by the presence or absence of coordination control
between DUs in a state where multiple adjacent terminals are
located near the communication range boundaries of two DUs that are
connected to the CU and are in communication with each DU.
In one set of verification experiments, coordination control is not
being performed; this has resulted in significant interference and
a decrease in the quality of communications. This is because beams
were formed and downstreaming was performed without considering the
influence of terminals controlled by other DU.
However, in other experiments, when coordination control is
performed, beams are formed through coordination between DUs. This
prevents a decrease in the quality of communication caused by radio
wave interference between DUs and improves the downlink throughput
by as much as 50%. Moreover, it has been confirmed that stable and
high-quality communications can be available regardless of
location.
"NEC is committed to contributing to the successful roll-out of 5G
in the near future, including these verification trials using the
massive-element AAS base station system," said Kenichi Ito, Deputy
General Manager, Wireless Network Development Division, NEC
Corporation. "Moving forward, we aim to continue driving the
advancement of high-speed, large capacity communications and
sophisticated service functions that contribute to services
provided by telecommunications carriers."
NEC will display this system and introduce 5G initiatives in Hall
3, Stand 3M30 at Mobile World Congress 2018 in Barcelona, Spain,
from Monday, February 26 to Thursday, March 1.
This press release includes a portion of results from "The research
and development project for realization of the fifth-generation
mobile communications system" commissioned by The Ministry of
Internal Affairs and Communications, Japan.
(1) Testing carried out at the Yokosuka Research Park, NEC's
Tamagawa Plant and others.
(2) Super High Frequency: Radio waves with wavelengths from one to
ten centimeters that fall within the microwave band with
frequencies from 3GHz to 30GHz. Low-SHF refers to radio waves at
frequencies of 3GHz to 6GHz.
About NEC Corporation
NEC Corporation is a leader in the integration of IT and network
technologies that benefit businesses and people around the world.
By providing a combination of products and solutions that cross
utilize the company's experience and global resources, NEC's
advanced technologies meet the complex and ever-changing needs of
its customers. NEC brings more than 100 years of expertise in
technological innovation to empower people, businesses and society.
For more information, visit NEC at http://www.nec.com.
Based on its Mid-term Management Plan 2015, the NEC Group globally
provides "Solutions for Society" that promote the safety, security,
efficiency and equality of society. Under the company's corporate
message of "Orchestrating a brighter world," NEC aims to help solve
a wide range of challenging issues and to create new social value
for the changing world of tomorrow. For more information, please
visit
http://www.nec.com/en/global/about/solutionsforsociety/message.html.
Source: NEC Corporation
Contact:
NEC
Seiichiro Toda
s-toda@cj.jp.nec.com
+81-3-3798-6511
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