Mobile Internet on Taiwan High Speed Rail
Sean Hsien-Wen Chang, Ph.D
Senior Engineer
Information and Communications Lab.
Mar. 29th 2017
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Outline
Motivation and Challenges
Developed Technologies
Achievement
H2020 Project Participation
Summary
2
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Motivation
The video we watch most on high-speed train is…
3
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Challenges
Complex signal processing related to high mobility
Signal penetration loss
Frequent group handoverTerrestrial signal shadowing
and blocking
Challenges for HSR
communications
4
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Developed Technologies (1/3)
Two-hop architecture
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LTE
CPE
Core NetworkeNB
Test
Server
WLAN
AP
WLAN
AP
WLAN
AP
WDS Link
WLAN
AP
WLAN
AP
WDS Link
WLAN
AP
WLAN
AP
WDS Link
PoE
WLAN
AP
PoEPoEPoE
In ITRI Lab.
On-board
WiFi/Small cells
Roof-mounted
MIMO AntennaFeatures
- CPE handles the
complex signal
processing
- Improved coverage
for on-board UEs
- Frequent group HO
avoidedWiFi AP
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Developed Technologies (2/3)
Roof-mounted MIMO antenna
6
Frequency
(MHz)Polarization
Antenna 1 1700~1900 Vertical
Antenna 2 1800~1900 Horizontal
• Ground Plane Size: 370 mm× 370 mm
• Antenna Housing Height: 150 mm
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Developed Technologies (3/3)
Radio-over-Fiber Distributed Antenna System (RoF DAS)
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System Spec.
Max Tx Power: 26dBm
Frequency- FDD:
UL: 1710~1785MHz; DL:1805~1880 MHz
Frequency- TDD:
2500~2700MHz
Dynamic Range>50dB
EVM<2.5%
Tx/Rx Isolation in RAU>90dB
Measurement results (BW 15MHz)
Verify the transparency of RoF system
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FDD HEU FDD RAU
UE
FDD RoF
Average DL TCP
(Mbps)
Average UL TCP
(Mbps)
w/o RoF 106.0 35.2
with RoF 106.0 35.2RSRP of Dongle is fixed at -87dBm.
Optical
Fibers
RAU’s
Location
AC 220
Fibers
RF
cable
RAUHEU
4G LTE
BTS
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Achievement (1/2)
8
Testbed deployment
Track-side
On-board
Telecom Room
Inter-carCar 6
Roof-mounted MIMO antenna
Inter-car Other cars Inter-car
LTE SignalLTE Small cell LTE CPE WiFi/S.C. AntennaSwitch DC 100VWiFi AP
Copyright 2009 ITRI 工業技術研究院Copyright 2017 ITRI 工業技術研究院 工研院重要規劃資料,禁止複製、轉載、外流,請依規定保管使用。
38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Achievement (2/2)
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Max.: 48Mbps
Avg.: 18Mbps
0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900330332334336338340342344
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA
Cell
Relative Time (sec)
UE Sync.Cell 2016-12-7 T0834 NBAS - CHT
0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900-140-130-120-110-100-90-80-70-60-50-40-30
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA
RS
RP
(dB
m)
Relative Time (sec)
UE RSRP 2016-12-7 T0834 NBAS - CHT
0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 9000
10
20
30
40
50
60
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA
Relative Time (sec)
Rx R
ate
(M
bps)
DL TCP Rx Rate 2016-12-7 T0834 NBAS - CHT
犁頭山 湖口
Max.: 37Mbps
Avg.: 16Mbps
Experiment results
For Wi-Fi Users
For Small Cell users
HsinChu犁頭山湖口TaoYuan
TaoYuanHsinChu
Tested with fast southbound train
Tested with local northbound train
H2020 Project Participation
10
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Vision:
The fronthaul and backhaul will converge into a 5G-Crosshaul SDN/NFV-based framework capable of supporting new 5G RAN architectures and performance requirements
Main Building Blocks
XCF – Crosshaul Common Frame
XFE – Crosshaul Forwarding Element
XPU – Crosshaul Processing Unit
XCI – Crosshaul Control Infrastructure
Novel network applications
20 International Collaborating Partners:
Operators: Telecom Italia, Telefonica, Orange
Vendors: NEC, Ericsson (Sweden, Italia), Nokia, InterDigital
Academia (in Europe): UC3M, ULund, HHI, CTTC, CREATE-NET, POLITO
SMEs: ATOS, Visiona, Nextworks, CND, TELNET
Non-European partner: ITRI
(1/2)
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
(2/2)
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ITRI main focus & advantages in the project collaboration: Propose high-speed train use case (WP1) Develop radio-over-fiber (RoF) transmission and management tech. (WP2) Develop multi-tenant application for transport network sharing (WP3, WP4) Develop fast handover mechanism in Crosshaul (WP4) Develop and demo context-aware RoF energy management over high-speed
train testbed (WP3, WP4 & 5)
MMA: mobility management application
MTA: multi-tenant application
EMMA: energy management & monitor application
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
METIS-II (1/2)
Objectives 5G Radio Access Network Design
19 Partners:
Operators: NTT Docomo, Orange, DTAG, Telefonica, Telecom Italia
Vendors: Ericsson, Nokia, Huawei,Alcatel-Lucent, Samsung, Intel
Academia (in Europe): KTH,Uni Valencia, Uni Kaiserslautern
SMEs: iDate, Janmedia
Non-European partners: NYU, Winlab, ITRI
Project coordinator: Olav Queseth, Ericsson
Technical manager: Patrick Marsch, Nokia
Develop the overall
5G radio access network design
Provide the 5G collaboration framework
within 5G-PPP for a common evaluation of
5G radio access network concepts
Prepare concerted action towards
regulatory and standardization bodies
1
2
3
Special focus on pre-
standardization
Copyright 2009 ITRI 工業技術研究院Copyright 2017 ITRI 工業技術研究院 工研院重要規劃資料,禁止複製、轉載、外流,請依規定保管使用。
38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
METIS-II (2/2)
High Speed Design in Deliverable 6.1
Requirements specific to high or very high Mobility e.g. Doppler effect and RAN design considerations to support such requirements
In high speed scenarios e.g. 240 Km/Hr or even higher, channel estimation is quite difficult and the inter-carrier interference is significant due to large normalized Doppler frequency.
Hybrid approach of increasing reference signal density and increasing subcarrier spacing is proposed to effectively alleviate these issues without heavy computation complexity or large redundancy in the receiver
14
15KHz subcarrier spacing and 2 DMRS
symbols (Legacy LTE) in a subframe
DMRS symbol
1ms 0.5ms
30KHz subcarrier spacing and 3 DMRS
symbols (Proposed) in a subframe
An Illustration of the proposed method from legacy LTE
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
5G-CORAL (1/3)
5G-CORAL in a Nutshell A 5G Convergent Virtualized Radio Access Network Living at
the Edge
A joint EU-Taiwan proposal for the Research and Innovation Action H2020 ICT-08-2017, addressing 5G Convergent Technologies with focus on Access Convergence.
15
Europe Taiwan
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
5G-CORAL (2/3)
Virtualization framework A hierarchical multi-tier computing infrastructure, from clouds
and central data centers (DCs) on top, down to edge data centers (Edge DCs), and further distributed down into fog computing devices (Fog CDs)
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Mobile (non-stationary) Fog CDs are also considered, for example when hosted on moving devices (e.g., car, train, mobile user).
The focus is on the edge
and fog tiers of the
distributed computing
infrastructure, along with
their interaction with the
distant tiers.
Copyright 2009 ITRI 工業技術研究院Copyright 2017 ITRI 工業技術研究院 工研院重要規劃資料,禁止複製、轉載、外流,請依規定保管使用。
38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
5G-CORAL (3/3)
Trials @Large-Scale Test beds in Taiwan
17
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38th WWRF, Hsinchu, Taiwan, 28th-30th March 2017
Summary
Develop technologies to address challenges for high-mobility communications
Join international cooperation toward next generation technologies for high-mobility communications
The goal is indistinguishable user experience at any speed.
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Two-hop architecture MIMO antenna RoF DAS
Complex signal processing
related to high mobility
✅
Signal penetration loss ✅
Frequent group handover ✅ ✅
Terrestrial signal
shadowing and blocking
✅ ✅
Copyright 2009 ITRI 工業技術研究院Copyright 2017 ITRI 工業技術研究院 工研院重要規劃資料,禁止複製、轉載、外流,請依規定保管使用。 19