Mobile Internet on Taiwan High Speed Rail - WWRF

Mobile Internet on Taiwan High Speed Rail

Sean Hsien-Wen Chang, Ph.D

Senior Engineer

Information and Communications Lab.

Mar. 29th 2017

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

Outline

Motivation and Challenges

Developed Technologies

Achievement

H2020 Project Participation

Summary

2



Motivation

The video we watch most on high-speed train is…

3



Challenges

Complex signal processing related to high mobility

Signal penetration loss

Frequent group handoverTerrestrial signal shadowing

and blocking

Challenges for HSR

communications

4



Developed Technologies (1/3)

Two-hop architecture

5

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




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




Radio-over-Fiber Distributed Antenna System (RoF DAS)

7

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

7

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



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



Achievement (2/2)

9

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



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)



(2/2)

12

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



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



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



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



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)

16

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.



5G-CORAL (3/3)

Trials @Large-Scale Test beds in Taiwan

17



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.

18

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

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Mobile Internet on Taiwan High Speed Rail - WWRF