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TRANSCRIPT
© 2016 NTT DOCOMO, INC. All Rights Reserved.
3.5GHz Development in DOCOMO
Hiroyuki Atarashi
Radio Access Network Development Department NTT DOCOMO, INC.
© 2008 NTT DOCOMO, INC. All rights reserved. © 2016 NTT DOCOMO, INC. All Rights Reserved.
Introduction (1)
• The 3.5GHz band was licensed to three Japanese mobile operators in December 2014
• Several technical requirements were specified: – LTE-Advanced (TDD) – Requirements for base station deployment, such as more than 50% of
the population coverage – Application of technologies for efficient utilization of spectrum, such
as carrier aggregation, adaptive modulation, etc.
NTT DOCOMO KDDI Softbank
Microwave links for broadcasters
Satellite systems
3400 3456 3480 3520 3560 3600
To be licensed until November, 2022 (MHz)
Assigned spectrum (40MHz each x 3 operators)
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Introduction (2)
• NTT DOCOMO launched the 3.5GHz commercial service in June 2016
• This presentation provides overview of: – DOCOMO’s 3.5GHz technology development – DOCOMO’s 3.5GHz commercial service
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DOCOMO’s 3.5GHz technology development
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“Advanced C-RAN architecture” concept
• DOCOMO’s proposed RAN architecture concept for LTE-Advanced – Integration of “Carrier aggregation (CA)” and
“Small cells” using “C-RAN architecture”
BBU
BBU: Based-Band Unit, RH: Radio Head
Optical fibers
Small cells (3.5GHz TDD)
CA
RH
CA
CA
RH
CA
Macro cell (FDD)
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RH
RH
RH
RH
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Advantages of “Advanced C-RAN architecture” • Suitable for small cells deployment providing:
– High data rate and high-capacity network – Good mobility performance
Without Advanced C-RAN architecture
Handover Handover Handover Handover
Data rate
With Advanced C-RAN architecture
Data rate
CA CA
Always connected to macro cell & High data rate in small cells
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Developed RAN equipment for 3.5GHz • Various deployment scenarios are supported
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GPS
RH Antennas
RH Antennas
Antenna FHM RH
For indoor
FHM
For small cells
BBU
For macro cells
NW synchronization
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Base Band Unit (BBU) • Up to 48 cells can be accommodate to realize
“Advanced C-RAN architecture” • This BBU can accommodate 3.5GHz-cells as well as
existing FDD frequency bands’ cells • Combination of different vendors’ BBU and RH is
possible (i.e., multi-vender solution)
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Radio Head (RH) for 3.5GHz • Two types of RH for different scenarios
– RH for 3.5GHz small cell & indoor – RH for 3.5GHz macro cell in suburban/rural scenarios
For small cells/indoor For macro cells
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• 0.48W/20MHz/branch • Less than 4L
• 19W/20MHz/branch • Less than 9L
© 2008 NTT DOCOMO, INC. All rights reserved. © 2016 NTT DOCOMO, INC. All Rights Reserved.
Antennas for 3.5GHz
• Different types of antennas have been developed for different deployment scenarios
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For small cells For macro cells For indoor
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FrontHaul Multiplexer (FHM)
• A FHM distributes & combines a maximum of 16 RF signals on the fronthaul
• It can provide a economically efficient solution to serve different areas as a single cell
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BBU
FHM
FHM FHM
© 2008 NTT DOCOMO, INC. All rights reserved. © 2016 NTT DOCOMO, INC. All Rights Reserved.
Further details
• Further details can be found in “Special Articles on Introducing the 3.5-GHz Band” in “NTT DOCOMO Technical Journal”
– NTT DOCOMO's Efforts Concerning Technical Developments for Introducing TD-LTE in 3.5-GHz Frequency Band
– Base-station Equipment with the Aim of Introducing 3.5-GHz band TD-LTE
– Base Station Antennas for 3.5-GHz Band – High-precision Clock-time-synchronization Network Equipment for
Introduction of 3.5-GHz band TD-LTE – Router-type Mobile Terminal for TD-LTE in 3.5-GHz Band
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DOCOMO’s 3.5GHz commercial service
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Japan’s first 3.5GHz commercial service
• 370Mbps service using the 3.5GHz band – Launched in June 2016 in 35 cities across Japan – Currently, expanded to 50 cities across Japan*
* Other than Tokyo, Nagoya and Osaka, 332.5Mbps service using 3.5GHz is available in 32 cities across Japan
Maximum 110Mbps
Maximum 110Mbps
3.5GHz
3.5GHz
Maximum 150Mbps 1.7GHz
Aggregation Maximum 370Mbps
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Planned further enhancement
• Service will be enhanced to
682Mbps using 4x4 MIMO & 256QAM
2015 2020
5G FY 2014
2016
PREMIUM 4G
225Mbps 300Mbps 375Mbps
370Mbps
3CC using FDD
bands
3.5GHz TDD+FDD
682Mbps
3.5GHz TDD+FDD 4x4 MIMO 256QAM
~1Gbps
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Maximum
682Mbps
Maximum 241Mbps
Maximum 241Mbps
3.5GHz
3.5GHz
Maximum 200Mbps 1.7GHz
Aggregation