Doc.: IEEE 802.11-09/0111r0 Submission January 2009 Hitoshi MORIOKA, ROOT Inc.Slide 1 Broadband V2I Access for High Speed Transportation Notice: This document

January 2009

Hitoshi MORIOKA, ROOT Inc.

Slide 1

doc.: IEEE 802.11-09/0111r0

Submission

Broadband V2I Access for High Speed Transportation

Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

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Date: 2009-1-20

Name Company Address Phone email Hitoshi MORIOKA ROOT Inc. 2-1-22-307 Momochihama,

Sawara-ku, Fukuoka 814-0001 JAPAN

+81-92-832-3391 [email protected]

Hiroshi MANO ROOT Inc. 8F TOC2 Bldg. 7-21-11 Nishi-Gotanda, Shinagawa-ku, Tokyo 141-0031 JAPAN

+81-3-5719-7631 [email protected]

Authors:

January 2009


Slide 2

doc.: IEEE 802.11-09/0111r0

Submission

Abstract

• We talk about WLAN broadband access for high speed transportation.– Motivation

– Market

– Requirement• Handover Latency Case Study

– Comparison with Existing IEEE802.11 Standards

– Comparison with Other Standards

– Straw Poll

January 2009


Slide 3

doc.: IEEE 802.11-09/0111r0

Submission

Motivation

• Many high speed trains (>200km/h) are already in operation in Europe and Asia.

• Developments of 10,000km of express railway tracks are estimated in next 20 years in the world.

• Train operators want broadband network between rail-side and train for such as train survey, passenger service and so on.

• And they want to operate the network by their own.

Wi-Fi will meet their needs. (Equipments cost, Operation cost, Bandwidth…)

January 2009


Slide 4

doc.: IEEE 802.11-09/0111r0

Submission

Markets

• Train (Railway Transportation)• Total extension of railway is

approximately 1,350,000km in the world.

– North America: 278,000km – EU: 236,000km– Russia: 128,000km– East Asia: 110,000km– Central/South America: 110,000km

• Existing high speed train (> 200km/h

operation)– 22 systems in operation in 15 countries.

• Expected new high speed train– 10,000km in next 20 years.

• Of cause, not only high speed train but also ordinary train can use this technology.

Name Country Max. Speed

Shanghai Transrapid

China 430km/h

Beijing-Tianjin HSCL

China 350km/h

TGV France 320km/h

ICE Germany 320km/h

Shinkansen Japan 300km/h

AVE Spain 300km/h

Eurostar EU 300km

Thalys EU 300km/h

Treni Eurostar Italia

Italy 300km/h

Taiwan HSR Taiwan 300km/h

KTX Korea 300km/h

Existing High Speed Train (> 300km/h)

January 2009


Slide 5

doc.: IEEE 802.11-09/0111r0

Submission

Expected Applications

• Hot-spot service for passengers.• On board digital signage.• Cabin monitoring.• Backbone for femtocell.

– Subway– Tunnel

Internet

January 2009


Slide 6

doc.: IEEE 802.11-09/0111r0

Submission

Requirements

• Target Speed– TGV plans 360km/h operation.– TransRapid in Shanghai is operated in 430km/h.– JR-Maglev records 581km/h and JR plans to start service in 2025.– 500km/h is enough?

• Scalability– Railway networks are so huge and many trains run on a network

simultaneously.– So a train runs across many communication network.

• Security– Security is very important because private information will flow on

networks.– For example, a train survey application will transfer a video which

includes a passenger’s face and his lunch.

January 2009


Slide 7

doc.: IEEE 802.11-09/0111r0

Submission

Inter-Network Use

Network A

AP AP AP

Network B

AP AP AP

Network C

AP AP AP

Network D

Inter-Network Handover Inter-Network Handover

January 2009


Slide 8

doc.: IEEE 802.11-09/0111r0

Submission

Inter-network Handover Latency

1. Discover a new AP.• Latency can be reduced by 11k or multiple radio interfaces.

2. Association with new AP.

(includes authentication/key exchange…)• 11i authentication is NOT fast.

• It needs many packet exchanges.

3. Network layer setup.

January 2009


Slide 9

doc.: IEEE 802.11-09/0111r0

Submission

MAC Requirements

• Fast Association– Train must handover during passing overlap zone for seamless

handover.

– Handover latency impacts distance between APs. (= cost)

Old AP New AP

Overlap Zone

January 2009


Slide 10

doc.: IEEE 802.11-09/0111r0

Submission

Case Study• Assumption

– Maximum speed: 500km/h = 140m/s– Cell Radius: 200m– Route Length: 1,000km

Old AP New AP

Case1: Handover Latency = 100msMinimum Overlap Zone length= 14mDistance between adjacent APs = 386mNumber of APs = 2,591

14m200m

200m

386m

January 2009


Slide 11

doc.: IEEE 802.11-09/0111r0

Submission

Case Study (cont.)

Old AP New AP

Case2: Handover Latency = 500msMinimum Overlap Zone distance= 70mDistance between adjacent APs = 330mNumber of APs = 3031 (117% of Case 1)

140m200m

200m

260m

Case3: Handover Latency = 1sMinimum Overlap Zone distance= 140mDistance between adjacent APs = 260mNumber of APs = 3847 (148% of Case 1)

January 2009


Slide 12

doc.: IEEE 802.11-09/0111r0

Submission

Case Study (cont.)

Old AP

Case4: Handover Latency >1.43sMinimum Overlap Zone distance > 200m

200m

New AP New AP

STA must begin new handover process before completing old handover process.

January 2009


Slide 13

doc.: IEEE 802.11-09/0111r0

Submission

Comparison with Existing IEEE802.11 Standards

StandardsInter-Network Use

SecurityFast Roaming (Handover)

IEEE802.11/a/b/g/n

+IEEE802.11i

+IEEE802.11r

We need

Approachesa. Fast authentication/key exchange.b. Inter-network fast roaming.

January 2009


Slide 14

doc.: IEEE 802.11-09/0111r0

Submission

PHY Compatibility

• Existing PHY can be used in high speed environment. (08/1020r1)

• So existing WLAN chipset can be used with some firmware and/or driver modification.

LOW COST

January 2009


Slide 15

doc.: IEEE 802.11-09/0111r0

Submission

Comparison with Other Standards

Standards Bandwidth Equipment Cost Operation Cost

3G, 3.5G

14.4Mbps (Downlink)

11.5Mbps (Uplink)

Very High High

LTE

100Mbps (Downlink)

50Mbps (Uplink)

Very High High

WiMAX (IEEE802.16e)

21Mbps High Low

IEEE802.11100Mbps

(11n MAC)Low Low

January 2009


Slide 16

doc.: IEEE 802.11-09/0111r0

Submission

Questions & Comments

Documents

Doc.: IEEE 802.11-09/0111r0 Submission January 2009 Hitoshi MORIOKA, ROOT Inc.Slide 1 Broadband V2I Access for High Speed Transportation Notice: This document