BUAA

How Vehicular Ad hoc Networks Serves Smart

CityDr Juhua Pu

Beihang University

Guideline

What is VanetWhy we need VanetResearch hot spot of VanetVanet and Smart City

What is Vanet

Vanet: Vehicular Ad hoc Networks

What is Vanet

for easy and effective communication between vehicles with dynamic mobility uses WiFi IEEE 802.11 and WiMAX IEEE 802.16

a form of Mobile ad-hoc network Dynamic but not random mobility moving in an organized fashion

What is Vanets

Providing V2V and V2I communications V2V: Vehicular to Vehicular communications V2I: Vehicular to Infrastructure communications

Widely used traffic safety comfort of driving and traveling ……

Guideline

What is VanetWhy we need VanetResearch hot spot of VanetVanet and Smart City

Why Vehicular Networks?

• Safety Traffic accident

• Millions of Fatalities and Injuries(US2004: 42,800 vs. 2,800,000)

• Thousands of Billions cost to society(US2004:230.6 billions)

Traffic jams• Traffic jams generate a tremendous waste of time and of

fuel• Also increasing the pollution

Most of these problems can be solved by providing appropriate information to the driver or to the vehicle

Efficiency Traffic jams waste time and fuel In 2003, US drivers lost a total of 3.5 billion hours

and 5.7 billion gallons of fuel to traffic congestionProfit

Safety features and high-tech devices have become product differentiators

Examples

Research institute and system

TrafficViewFleetNet & NOWCarTelMobeyesCAR2CARIntelliDrive

Guideline

What is VanetWhy we need VanetResearch hot spot of VanetVanet and Smart City

Research Hot spot

FrameworkConnectivityMobility modelRoutingData managementSafety and securityapplications

routing

Single cast vs. Multicast vs. BroadcastSingle hop vs. multi hopStorage-carry-forward

Broadcast in heterogeneous Vanet

directional broadcast (DBroadcast)regional broadcast (Rbroadcast)

C

D

G

H

Broadcast storm

Three main issues for broadcast in Vanet

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network

partition

intersection

broadcast

storm partitionintersctio

nDBroadcast √ √ —

RBroadcast √ √ √

A

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AB

C F

D

H

G

E

Heterogeneous Vanets

Each vehicle has different communication radius Vehicle changes proactively Signal block etc. Equipment Heterogeneity by Manufacturers ……

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S A B C

Heterogeneity and the three main issues

Broadcast storm

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Heterogeneity and the three main issues

Network partition

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Heterogeneity and the three main issues

Intersection broadcast

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Non-Redundant Communication RangeNon-Redundant Communication Range， NRCR

Broadcast storm

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Isomeric Forward， IF

Receiving HELLO message

Receiving EVENT message

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A’s driving along EVENT

forward direction

B’s driving along EVENT

forward direction

B is farther than A along

EVENT forward direction

EVENT typeCase no.

What to do

× × √ — aA changes to non-tail

node

× × ×BROADCAST_NORMAL b ignore

BROADCAST_TO_RELAY bA changes to non-tail

node

× √ — — c,dA changes to non-tail

node

√ × √BROADCAST_NORMAL e

A changes to non-tail node

BROADCAST_TO_RELAY e Need more calculation√ — × — f,h ignore

√ √ √ — gA changes to non-tail

node

B’s driving along EVENT forward

direction

B is farther than A along EVENT forward

directionCase no. What to do

√ — c,dSet EVENT type as BROADCAST_TO_RELAY and

broadcast. A changes to non-tail node

× √ aSetting EVENT type as BROADCAST_NORMAL and

broadcast. A changes to non-tail node× × b ignore

Isomeric Carry， IC

BROADCAST_NORMAL EVENT

BROADCAST_TO_RELAY EVENT

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B Carrying B not Carrying

B Carrying B not Carrying

Isomeric Intersection Broadcast，IIB

Intersection Delay

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Loc. of sending

node

Loc. of receiving

node

What to do(sending)

Receiving node gotten this

EVENTWhat to do(receiving)

intersection intersectionintersection

delay —

carrying ， directional broadcast while approaching intersection(farther than

communication radius)

intersectionBidirection

roadintersection

delay

√ ignore

×carrying ， directional broadcast while approaching intersection(farther than

communication radius)Bidirection

roadintersection

Directional broadcast

√ ignore× Intersection delay

Bidirection road

Bidirection road

Directional broadcast

—Directional broadcast in the same road

but block in different raods

Loc. of sending

node

Loc. of receiving

node

What to do(sending)

Receiving node gotten this

EVENTWhat to do(receiving)

intersection Intersectionintersection

delay

√carrying ， directional broadcast while approaching intersection(farther than

communication radius)

×carrying ， directional broadcast while approaching intersection(farther than

communication radius)

intersectionBidirection

roadintersection

delay

√ ignore

×carrying ， directional broadcast while approaching intersection(farther than

communication radius)Bidirection

roadIntersection

Directional broadcast

√ ignore× Intersection delay

Bidirection road

Bidirection road

Directional broadcast

√Directional broadcast in the same road

but block in different raods

×Directional broadcast in the same road

but block in different raods

Evaluation(DBroadcast)

5 vpkm & 50 vpkm

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Evaluation(Rbroadcast)

5 vpkm & 50 vpkm

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Data management

教师试讲－学术报告

Beihang University

Networks

character

Simuplatform

Replica Deletion

Data

Transmission

Data Management

Multicast

Cooperative data dissermination

Replica Deletion

DTN+Vanet

MPEB, E-MPEB

COTS

SuDA, RAD

BHU-VSim

Guideline

What is VanetWhy we need VanetResearch hot spot of VanetVanet and Smart City

Applications for VANETs

Public Safety ApplicationsTraffic Management ApplicationsTraffic Coordination and Assistance

ApplicationsTraveler Information Support ApplicationsComfort ApplicationsAir pollution emission measurement and

reductionLaw enforcementBroadband services

Applications (details)

• Congestion detection• Vehicle platooning• Road conditions

warning• Collision alert• Stoplight assistant• Emergency vehicle• warning

• Deceleration warning• Toll collection• Border clearance• Adaptive cruise control• Drive-through payment• Merge assistance

Vanets and smarty city

Vanets can be an infrastructure of data collection for smart city

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100,000 vehicle-mounted sensors covering the whole roads in the metropolis

More than 100,000 road links of all kinds of complexity level Handle more than 500,000 GPS position points and related

parameters each cycle

Telematics-floating cars based information services system

Show real-time traffic situation and congestion of the metropolitan road network in China for the first time Provide users with local micro-city traffic information for the first time The services include international well-known car company , mobile terminal manufacturers , mobile operators and internet companies.

2005

The first domestic internet dynamic traffic information service：

Bei Jing Public transportation

websiteThe first domestic

value-added mobile data

service of dynamic traffic

information

2006 2007

The first navigation equipment MIO C320T

Carrying dynamic traffic information service

2008

The first Vehicle dynamic traffic information service：Nissan Teana

First nationwide multi-city Roaming serviceOf dynamic traffic information ：Beijing、 Shanghai、 Guangzhou、 Shenzhen

First mobile internet dynamic navigation service

2009

The first domestic dynamic traffic service based on portals

Dynamic traffic information service

serve Olympic successfully

2010The first domestic dynamic navigation equipment

First vehicle interactive dynamic navigation service： G-BOOK

Dynamic traffic information service serve Shanghai World Expo

FAW、 SAIC、 Toyota、 nissan、BMW、 G.M.

The Milestone of Industrialization

宁波

沈阳

天津

成都南京

重庆

泉州

福州

台州温州

昆明

济南

长沙

武汉

南昌

合肥郑州

西安

太原

苏州

北京

上海

广州

深圳

石家庄 大连

青岛

杭州无锡

贵州省

广西省

甘肃

西藏

新疆

呼和浩特

宁夏青海

吉林省

黑龙江省

金华

Content Sub-content Current Status Nr

Basic Contents

Traffic Flow and Prediction

Real-time Information

Beijing 、 Shanghai 、 Guangzhou 、 Shenzhen 、 Chengdu 、 Chongqing 、 Nanjing 、 Ningbo 、ShenYang 、 Tianjin 、 Suzhou 、 Fuzhou 、 Qingdao 、 Shijiazhuang 、 Changsha 、 Huhehaote

、 Dongguan 、 Foshan, 、 Chongqing 、 Nanjing 、 Fuzhou 、 Kunming 、 Quanzhou 、 Taizhou 、 Wuxi 、 Zhongshan 、 Jinhua 、 Wuhan 、 Wenzhou 、 Xiamen 、 Changchun

33

Prediction Information Beijing 、 Shanghai 、 Shenzhen 3

Traffic Event Beijing 、 Shanghai 、 Guangzhou 、 Shenzhen 、 TianJin 5

Content Current Status Nr

Advanced Contents

Parking Information Shanghai 1

Creative Traffic Information Representation Current Status Nr

Simplified Graphic Traffic Information Beijing 、 Shanghai 、 Guangzhou 、 Shenzhen 4

•2008 ： 4 metros of BeiJing, ShangHai,

GuangZhou, ShenZhen

•2009 ： Increasing 6 cities:

•2010 ： Increaseing 12cities

•2011 ： Increaseing 10 cities, major inter-

connecting motorways of China

东莞佛山

Service Coverage

ES240/350 RX350/450h LX 570 Crown Camry

Terminal

Telecom operators

TEANAG25/37 Sedan G37 Coupe G37 Convertible EX25/35

Websites

IOV/Telematics service

LS600HL

Manufacturers

• Providing data to Toyota, Nissan, GM and other brand • Providing data to mobile devices made , such as Jiaming, Nokia and other manufacturers. • Providing data to China Mobile and China Telecom's • The real-time traffic services provided by them have reaches to millions.

Industry Customer