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![Page 1: 1 Prof. Chung-Ming Huang Introduction to Telematics and ITS research topics National Cheng Kung University Department of Computer Science and Information.](https://reader036.fdocuments.us/reader036/viewer/2022062500/56649d4e5503460f94a2de6f/html5/thumbnails/1.jpg)
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Prof. Chung-Ming Huang
Introduction to Telematics and ITS research topics
National Cheng Kung UniversityDepartment of Computer Science and Information Engineering
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OutlineOutlineIntroduction of Telematics
ConceptApplication and Service CasesTowards the Future
Technical Issue of TelematicsDSRC, a Technical ReviewStandardization for DSRCIndustrial and Academia
Research Issues of TelematicsFundamental Research Topics in TelematicsTechniques Development
Current Results
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MotivationMotivationIncreasing demand for network access
from vehiclesE.g., Web, email, VoIP…
Newly rising demand for cyber physical applications in ITSE.g., Computer Aided driving, safety
system, GIS… Ubiquity of radio coverage
Cellular(2G, 3G, B3G), WiFi, WiMax, …More smart objects embedded (RFID,
Sensors…)Usability of GPS and Satellite
communication
Summary• Telematics have much richer meanings
other than traditional telecommunication using mobile phone.
• ITS have brought fresh blood as well as new demand to telematics.
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EtymologyEtymology
Determined by Automotive Telematics author and academic Dennis Foy
TeleTele From the Greek Tele"
~Matics~Matics ~Matos, a derivative of the Gk machinari, or contrivance
'far away', especially in relation to the process of producing or recording)
usually taken in this context to mean 'of its own accord'
TelematicsTelematicsDescribing the process of long-distance transmission of computer-based information.
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TelematicsTelematicsTelematics is the term given to the technology that enables
remote access to vehicle data over a wireless network.
Telematics is used for the collection and dissemination of information between vehicle-based electronic systems, for vehicle tracking and positioning, on-line vehicle navigation, information systems and emergency assistance
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ConceptConcept
The term telematics (synonymous with telemetry) is used in a number of ways: The integrated use of telecommunications and informatics, also known as ICT
(Information and Communications Technology). More specifically it is the science of sending, receiving and storing information via telecommunication devices.
More recently, telematics have been applied specifically to the use of Global Positioning System technology integrated with computers and mobile communications technology in automotive navigation systems.
Most narrowly, the term has evolved to refer to the use of such systems within road vehicles, in which case the term vehicular telematics may be used.
It is a specialist technology which harnesses the power of telemetry (data collected via GPS and communicated via the GSM network?) combined with informatics (interpretation, management and distribution of information).
It provides fleet and vehicle asset managers with effective solutions for the efficient management of their mobile transportation assets, through the integration of cellular, geo-positioning, internet and software technologies
From wikipedia
From OnStar
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Other Versions of Telematics DefinitionOther Versions of Telematics Definition
A definition of a telematics system [Vissers]:A Telematics System supports interactions over distance
and/or time between people and/or processes by means of the integrated application of telecommunication and information technology.
Telematics Systems are used in:personal communication (telephone, e-mail, video
conferencing)banking, broking, insurancedistance learning, cooperative workingdesign and manufacturing (CAD/CAM), office automation
Summary:• There are many versions of Telematics concept.• There is no authoritative definition.• But we can summarize the features in:
• What is needed by Telematics?• What Telematics can supply us?
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FeaturesFeatures Telematics belong to:
Communication system Telematics should have:
Rich Communication Infrastructures GPS navigation supports Traditional Communication system supports
Cellular Comm. System, e.g., GSM, UMTS Internet Access, e.g., Mobile IP Wireless Access, e.g., WLAN, WAVE (802.11p), Mesh Intelligent Transportation system (ITS), e.g., driving assistance, safety comm. Vehicular Ad Hoc Network, V2V Comm.
Telematics Architecture: All are covered under the Telematics umbrella
Telematics supply: Network Access for Vehicle User, including Telecomm. Net. and Internet Fleet and vehicle asset managers Various of services, e.g., location services, ITS Service, More Innovative applications, … …
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More specific for Vehicular TelematicsMore specific for Vehicular TelematicsUsed to define connected vehicles interchanging electronic dataThese systems may be used for a number of purposes:
Collecting road tollsManaging road usage (intelligent transportation systems)Pricing auto insuranceTracking fleet vehicle locations (fleet telematics)Cold store logisticsRecovering stolen vehiclesProviding automatic collision notificationLocation-driven driver information servicesRemote diagnosticsforthcoming applications including on-demand navigation, audio and
audio-visual entertainment contentTechnologies particularly used:
Dedicated Short Range Communications (DSRC)
Summary• While there are many potential applications for vehicular
Telematics, the main advantage for transportation safety advocates is that it will help reduce and ideally eliminateroad injuries and road traffic related deaths worldwide.
• Services that connect the car to outside data are expected to proliferate in vehicles coming onto future market.
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Telematics Services Cases (1)Telematics Services Cases (1)
Standard equipment of “Help Net”, an emergency reporting device The standard equipment of “Help Net” is used in cases on
accident or sudden illness, whereby one can be connected to an exclusive operator at the touch of a button and request an ambulance by speaking into the microphone of the onboard unit.
Car audio system with a built-in G-DRM (G-Digital Rights Management) for music distribution On-demand car audio “G-DRM”, a digital protection system for
copyrighted works that manages encrypted music data stored on a hard disk.
Dedicated communication device: “DCM for exclusive use with GBOOK ALPHA”
G-BOOK ALPHA ⇒ ToyotaG-LINK
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Telematics Services Cases (2)Telematics Services Cases (2)
CARWINGS ⇒ NISSAN
Operator Service The driver can contact an operator by phone around the clock via a switch and
communicate his/her requests. Voice communication with an operator enables the driver to know the settings of the destination for the satellite navigation system, traffic information. Also, the driver can be interconnected to road services to obtain information on the closest hospitals.
To provides Information on Gasoline Prices Based on the location of a moving vehicle, real-time information of the
market price of gasoline in neighboring regions, and sales prices at recommended gas stations are displayed on a monitor.
(Others –under experimentation) Info-communications system utilizing
road-to-vehicle communications technology for the purpose of reducing collisions at intersections
Information provision system regarding speeding alerts driver to slow down speed in a School Zone, etc.
Dynamic route guidance system utilizing probe data to alleviate congestion and provide the fastest route
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Telematics Services Cases (3)Telematics Services Cases (3)
Floating Car System When a member’s car is operated in a preset road zone, the time
required to drive through the zone is uploaded for the supply of information. In addition, data provision by using satellite images is implemented.
Congestion Forecast Information Based on cumulative past data on congestion, changes in road conditions are
projected with high accuracy. Taking into account the time required for the vehicle to drive through the area, the least congested route is shown.
Lane-specific information Route guidance is provided taking into consideration the land-specific flow as well.
Inter-navigation Weather Weather information that will impact
driving is provided. Increased Operation Efficiency via
Exclusive Communication Cards
InterNAVI Premium Club ⇒ Honda
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Telematics Services Cases (4)Telematics Services Cases (4)
Collection and Analysis of Vehicle Operational information Operational data (fuel consumption, emissions volume of CO2, Nox, PM, location data,
driving operational data for the driver) are provided in real time. Vehicle Emergency Tracking Service
A service of ongoing reports on the location of the vehicle in case of emergency, such as car theft.
Temperature notice service A service to notify the person in charge when the temperature of the truck bed deviates from
the preset temperature range
Mimamori-kun (vehicle diagnostic information) ⇒ Isuzu
Higher speed and more advanced-function onboard communication modules together with expanded and improved network service environments, etc. are expected to enhance the environment, realizing even faster mobile communications. As a result, an even newer and more convenient Telematics industry will be created.
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Market of TelematicsMarket of Telematics
Resource; IEK (2008/10)
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Major Project of TelematicsMajor Project of Telematics
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Project of VII (North America)Project of VII (North America)
Vehicle Infrastructure Integration (VII)主要由 GM 、 Toyota 、 Ford 、 Daimler
Chrysler 、 Honda 、 BMW 、 Nissan 、 Volkswagen 等8 家車廠共同合作開發
以 DSRC 為實體通訊層面的關鍵技術。VII 為 U.S Department of Transportation 所訂定,主要的訴求為於改善交通安全與疏導交通等問題,其基本的定義就為一建立在車間以及車對道路之通訊,透過DSRC ( Dedicated Short Range Communications )通訊技術在 5.9GHz 頻帶上進行無線通訊傳輸。
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Project of GST (Europe)Project of GST (Europe)
由 50 多家業者在歐洲共同合作推展 Global System for Telematics (GST) 計畫
主要的目的在於協助歐盟走向共通開放相之車載資通訊服務市場。
此計畫由歐盟委員會指導,並由英、法、德、義、瑞等共 50 多家業者協同合作,在七個主要城市進行Field Test 的大型車載資通訊標準技術開發與實驗。
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Project of VICS (Japan)Project of VICS (Japan)
由 Toyota 、 Nissan 、及 Honda 參與的 Vehicle Information & Communications System (VICS) 計畫
各車廠分別以 VICS 系統發展自有品牌的車載資通訊服務
分別為: G-Book Alpha (Toyota) 、 Carwings (Nissan)及 Internavi (Honda) 。
雖然 Honda 進入 Telematics 發展的時間較晚,但Internavi 的會員人數於 2007 年已突破 50 萬人,多於G-Book Alpha 及 Carwings 。
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Telematics MarketTelematics Market
Global Market
Market Estimation of Telematics
Market of Cars in China
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Global MarketGlobal Market
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Global Market (Cont.)Global Market (Cont.)
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Market Estimation of TelematicsMarket Estimation of Telematics
Source: IBTS
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Car Market in ChinaCar Market in China
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Telematics IndustryTelematics Industry
Telematics service contains content information, terminal device, communication infrastructure.
Telematics Industry contains automotive industry, information industry, electronics industry, communication industry, digital content industry etc.
It must integrate with differ industries of above for providing services.
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International Telematics DevelopmentInternational Telematics Development
Focus Standard or Project
AmericaFocus on generality telematics system of customer.
AMI-C (Automotive Multimedia Interface Collaboration)
MOST (Media Oriented System Transport)OSGi Alliance
EuropeFocus on commercial vehicles application.
COMETA (COMercial vehicle Electronic and Telematic Architecture), KAREN, FLEETMAP, CEN TC278, GTP (Global Telematics Protocol)
JapanProvide superior quality of navigation and cell phone services.
Kiwi navigation information standard
KoreaExtend wireless communication service and application.
KOTBA (Korea Telematics Business Association)
Jeju Telematics City
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TaiwanTaiwan
Industrial Technology Research Institute (ITRI) developed. Telematics devices based on X86 structure.
It integrates navigation and e-MAP, customer multimedia structure, Bluetooth, 802.11 etc.
The 2nd telematics system addition remote Vehicle Diagnostics System, Lane Departure Warning System, etc.
Yulon Motor, Quanta Computer, ASUS and Hon-hai are impetus “IA integrate Car plan” to integrate with IT and Automotive industries.
Before Market: Focus on Inter-communication between navigation and other devices.
After Market: Focus on multimedia and pastime.
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ITS in TaiwanITS in Taiwan 先進交通管理服務 ( Advanced Traffic Management Services, ATMS ) 先進旅行者資訊服務 ( Advanced Traveler Information Services, ATIS ) 先進公共運輸服務 ( Advanced Public Transportation Services, APTS ) 先進車輛控制安全服務 ( Advanced Vehicle Control and Safety Services,
AVCSS ) 商車營運服務 ( Commercial Vehicle Operations, CVO ) 緊急事故支援服務 ( Emergency Management Services, EMS ) 電子收付費服務 ( Electronic Payment System & Electronic Toll
Collection, EPS&ETC ) 資訊管理系統 ( Information Management System, IMS ) 弱勢使用者保護服務 ( Vulnerable Individual Protection Services, VIPS )
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Future Telematics – Concept TelematicsFuture Telematics – Concept Telematics
TrendsIn-vehicle computing conceptsDriver/passenger control of devicesRear seat entertainmentRear seat computingRear seat printing!
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Summary of Part 1Summary of Part 1
All commercial Telematics today use mobile phones as All commercial Telematics today use mobile phones as communication mediacommunication media
With various infrastructure installed, assured communication is possibleCosts are reasonable, and most spread wireless mediaRelatively large size data transmission is possible
Necessity for the Sophistication of TelematicsDiversification of data to be transmitted and increase in data volumes
• Sophistication of mobile phones and development of new• wide area wireless system
Future?• Telematics technology &
Application deployment will be widespread by 2010
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Talk outlineTalk outlineIntroduction of Telematics
ConceptApplication and Service CasesTowards the Future
Technical Issue of TelematicsDSRC, a Technical ReviewStandardization for DSRCIndustrial and Academia
Research Issues of TelematicsFundamental Research Topics in TelematicsTechniques Development
Current Results
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DSRC—DSRC—A short range wireless technology for A short range wireless technology for TelematicsTelematics Applications Applications
Dedicated short-range communications (DSRC)One-way or two-way short- to medium-range wireless
communication channels specifically designed for automotive use and a corresponding set of protocols and standards.
Offering communication between vehicles and roadside equipments.
Having a range of up to 1,000 meters.Working in the 5.9 GHz band (U.S.) or 5.8 GHz band
(Japan, Europe) for ITS applications. Former standard used the 915 MHz band.
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New specifications for DSRCNew specifications for DSRC
Existing DSRC915 MHzRange < 30 metersData rate = 0.5 mbpsDesigned for ETC, but can be
used for other applicationsSingle unlicensed channelRequires special (custom) chip
set & softwareVehicle to roadsideCommand-response
New specifications5.9 GHzRange to 1000 metersData rate 6 to 27 mbpsDesigned for general internet
access, can be used for ETC7 licensed channelsUses open off-the-shelf chip set
& softwareVehicle to roadside & vehicle to
vehicleCommand-response & peer to
peer
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Based on IEEE 802.11aBased on IEEE 802.11a
High speed road impacts physical layerVery short latency (<50ms) impact on MAC layerRandom MAC addresses to preserve privacyIPv6 for network layer (with header compression allowed)Multiple stack options above network layerSupport for in-car networks
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DSRC for DSRC for TelematicsTelematicsDSRC allows high-speed communications between vehicles and the
roadside, or between vehicles, for Telematics; Potential DSRC applications for public safety and traffic
management include: Intersection collision avoidance Approaching emergency vehicle warning Vehicle safety inspection Transit or emergency vehicle signal priority Electronic parking payments Commercial vehicle clearance and safety inspections In-vehicle signalRollover warning Probe data collection Highway-rail intersection warning
Technically, meet the requirements of Telematics very much!
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Demo from MercedesDemo from Mercedes (1/2)(1/2)
Sometimes someplace instead of everywhere alwaysSometimes someplace instead of everywhere alwaysCan be targeted to specific lanes, directions of travel but
not for wide area coverage
Can be targeted to specific lanes, directions of travel but not for wide area coverage
Good News/ Bad NewsGood News/ Bad NewsRoadside Unit PlacementRoadside Unit Placement
General Internet AccessGeneral Internet Access On-Demand/Dynamic NavigationOn-Demand/Dynamic Navigation
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Demo from Mercedes (2/2)Demo from Mercedes (2/2)
Traffic AdvisoriesTraffic AdvisoriesTraffic AdvisoriesTraffic Advisories Use Vehicles as Traffic ProbesUse Vehicles as Traffic Probes
Travel AssistantTravel AssistantMore on Video from Mercedes
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Standards ProgramStandards Program
• Industrials
• Standard organization
• Academia
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Layered view for DSRC StandardsLayered view for DSRC Standards
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ClarificationClarification
WAVE (Wireless Access in Vehicular Environments)mode of operation used by IEEE 802.11 devices to operate in the DSRC
bandDSRC (Dedicated Short Range Communications)
ASTM Standard E2213-03, based on IEEE 802.11aname of the 5.9 GHz Band allocated for the ITS communications
IEEE 802.11pbased on ASTM Standard E2213-03currently draft standard
DSRC DevicesIEEE 802.11 systems using the WAVE mode of operation in the DSRC
band
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WAVE StandardsWAVE Standards IEEE 1609.1: WAVE Resource Manager
Defines Resource Manager Application Application data read/write protocol between RSU and OBU First application available for testing purposes
IEEE 1609.2: WAVE Security Services for Applications and Management Messages Defines 5.9 GHz DSRC Security (formerly IEEE 1556)
Anonymity, Authenticity and Confidentiality IEEE 1609.3: WAVE Networking Services
Provides description and management of the DSRC Protocol Stack Application interfaces Network configuration management WAVE Short Message (WSM) transmission and reception
IEEE 1609.4: WAVE Multi-Channel Operation Provides DSRC frequency band coordination and management
Manages Lower Layer usage of the seven DSRC channels Integrates tightly with IEEE 802.11p
IEEE 802.11p: Wireless LAN Medium Access Control (MAC) and physical layer (PHY) specifications: Wireless Access in Vehicular Environments (WAVE) Defines the Lower Layers of the communications stack
Radio wave forms and wireless medium access procedures
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WAVE Protocol StackWAVE Protocol Stack
Lower Layers
Networking Services
Upper Layers
Radio Service Security
IEEE 1609.1, et al.
IEEE 1609.3
IEEE 1609.4, IEEE 802.11p
WAVE device
Medium
IEEE 1609.2
Application Security
IEEE 1609.2
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Industrial ConcernsIndustrial Concerns
DSRC Devices R&DApplications and CostsMarket IssueDeploymentStandardization
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Academia ConcernsAcademia Concerns
WAVE Protocol establishmentCurrently accomplished drafts
1609.1, 1609.2, 1609.3, 1609.4, 802.11p, …Newly defined
1609.5, 1609.6
Fundamental StudiesDSRC technique developmentPerformance Enhancement
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CooperationCooperation
DSRC Devices R&DApplications and CostMarket IssueDeploymentStandardization
Applications and CostStandardizationWAVE protocol establishment - 1609.5, 1609.6DSRC technique Performance enhancement
WAVE protocol establishment - 1609.5, 1609.6DSRC technique Performance enhancement
Academia Concerns
Industrial Concerns
Cooperation
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Summary of Part 2Summary of Part 2The Internet is not being brought to the vehicle, but the vehicle will
become a part of the Internet;
Communications will be critical to all future transportation systems;
Technically, DSRC allows high-speed communications between vehicles and the roadside, or between vehicles, and affords various applications for Telematics;
Different Workgroups and organizations are doing the standardizing work;
Researches on Telematics should be done in company with standardizing and technical study.
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Talk outlineTalk outlineIntroduction of Telematics
ConceptApplication and Service CasesTowards the Future
Technical Issue of TelematicsDSRC, a Technical ReviewStandardization for DSRCIndustrial and Academia
Research Issues of TelematicsFundamental Research Topics in TelematicsTechniques Development
Current Results
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Research Topics in TelematicsResearch Topics in Telematics
Telematics are: Application/service-centric and practical R&D topics But borrowing some pure research-centric
techniques/knowledge to real life research So Research Topics in Telematics are Cross point of:
Application/Service Requirements Practical System Development and Deployment Inevitable Hardness in Physical Environments Current and Future Technologies
What and How to do in Telematics Research? Fundamental Studies Techniques Developments
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Fundamental Studies in TelematicsFundamental Studies in Telematics
Q1: Origins of the special technical problem in Telematics
Q2: What are the features of Vehicular Telematics?
Q3: How to deal with these features?
Q4: What can be supplied in Telematics?
A1: Mobility of vehicles
A2: Measurement Study for Vehicular Environment
A3: Techniques R&D to fit Vehicular Environment
A4: Challenge current Applications and Develop new
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Mobility ModelingMobility Modeling
Nodes tend to spend more time at intersectionsIncreases interference in this regionCan reduce connectivity
Buildings further reduce connectivity betweennodes on different streetsNodes often travel in opposite or orthogonal directionsShort interaction time window
Vehicular congestion slows nodesCan stabilize topology, but can reduce overall connectivity
A new mobility model for VANETs is needed…
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Measurement Studies for Vehicular EnvironmentMeasurement Studies for Vehicular Environment
Origins of difficulties in Vehicular TelematicsSpeed!!!
ResultsDoppler EffectBad quality channel condition
Chain Reaction Unstable LinksUnstable ConnectivitiesHardness in service provisions
Need quantitative studies to give detailed results
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A case of the Problems with Status Quo A case of the Problems with Status Quo Wireless StandardWireless Standard Discontinuous coverage Before Transfer need Scanning, Authentication, Association, DHCP
Discovery, ARP Req Status Quo TCP limitation
Get out of Coverage
AuthenticationAssociation
DHCP DiscoverArp Req
Ready to Transfer Content?
A long period (avg: 600ms) to tune to the right channel
Get into coverage, scanning
•Mean time to establish connectivity: 12.9 seconds
•A 60Km/H car will travel more than 200 meters in 12.9 Sec
•Considering retransmissions due to worse link quality
•Maybe no content is delivered during such encounter
Even Established in
time
Status Quo TCP will also
limit the transmission
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Techniques and Applications DevelopmentTechniques and Applications Development
ApplicationsNormal Data Acquisition and
Delivery
Mediastream or Interactive Application
Emergency services
Location aware services
Various of services
TechniquesDelay Tolerant or Disruption
Tolerant Network Techniques, Opp. Routing, etc.
Heterogeneous network coverage with seamless handoff techniques, Mesh network, Diversity, Multihoming, etc.
Channel allocation with priority, Service differential, etc.
GPS technology, localization techniques
mobile-P2P, service discovery, middleware, etc.
Techniques and Applications are tightly related.
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Research Topics in Telematics (1/2)Research Topics in Telematics (1/2)Vehicular network architectures and protocolsVehicular network performance modeling and analysisVehicular network medium access control and routing protocolsVehicular network flow and congestion controlQuality of Services (QoS) provisioning in wireless-enabled ITS
systemsTraffic management, vehicle control, and safety related applications
for ITS systemsNetworking and information services for users on the roads (by
automobiles, trains, planes, or ships)Cross-layer design and optimization for vehicular ad hoc networksMobility management and intersystem handovers Incentives, cooperation, and reputation systems
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Research Topics in Telematics (2/2)Research Topics in Telematics (2/2)
Routing protocols for active safety in VANETEmerging applications such as content distribution, infotainment,
Internet access, etc.Challenges of V2V, V2I, and I2V wireless communicationUse of wireless technology within carsSecurity issues in VANET and trustworthy networkingPropagation issuesEmerging inter/intra-vehicle and infrastructure-to-vehicle wireless
communication technologiesSimulation models and testbeds for VANET Implementation and field tests of VANET systemsPotential modifications needed to improve the DSRC standard
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A Layered ViewA Layered View Mobility Modeling PHY Layer
Channel modeling Modulation and coding Power control and scalability issues
MAC Layer Multi-channel organization and operation link control Queueing and Schedule Load Balance
Network Layer Topology Control Routing Handoff
Transport Layer Connection control
Application Layer Service provision & discovery
Multi layer related Security & Privacy Network management
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Summary of Part3Summary of Part3
Research on Telematics:Most problems are caused by the Speed!Researches usually aim at this special condition of vehicular
environmentChanges to traditional problems in each layer, e.g.:
PHY Layer: Power consumptions are no longer problemsMAC Layer: Link quality degrades due to packet loss rather than
collisions (in V2I cases)Network Layer: Mobility Management shows greater significanceTransport Layer: Congestion control may be not the main problemApp Layer: Various service, new and maybe different priority
e.g., safety app. vs delay tolerant app.
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Talk outlineTalk outlineIntroduction of Telematics
ConceptApplication and Service CasesTowards the Future
Technical Issue of TelematicsDSRC, a Technical ReviewStandardization for DSRCIndustrial and Academia
Research Issues of TelematicsFundamental Research Topics in TelematicsTechniques Development
Current Results
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Our research results (1/2) Our research results (1/2)
Research Papers SIP-based Network MobilityA Network-Aware P2P File Sharing System over the
Wireless Mobile Network EnvironmentLayer 7 Multimedia Proxy Handoff using Anycast/Multicast
in Mobile Networks
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Our research results (2/2)Our research results (2/2)
Research Project - WAVE-based DSRC Safety Applications Development (Project of Institute for Information Industry)Intersection Collision WarningEmergency Vehicle Approach
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SIP-based Network MobilitySIP-based Network Mobility(SIP-NEMO)(SIP-NEMO)
Chung-Ming Huang, Chao-Hsien Lee, and Ji-Ren ZhengLaboratory of Multimedia Mobile NetworkingDepartment of Computer Science and Information EngineeringNational Cheng Kung UniversityTaiwan, R.O.C.
IEEE Journal on Selected Areas in Communications, VOL. 24, NO. 9, pp. 1682- 1691, Sep. 2006. (SCI, EI)
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Host MobilityHost Mobility
A single mobile node (MN) changes its point of attachment in the Internet.
Mobile IPv6Each MN has 2 IP addresses (2-tier addressing)
Home Address (HoA)permanent address in the home network
Care of Address (CoA) temporary address in the visited/foreign network
Keep the “binding” correctthe mapping between HoA and CoA
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Network MobilityNetwork Mobility
• A set of hosts moves together from one location to another.
• Manageability Power saving Low complexity Few handoffs Internet
on-board unit
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IETF NEMO BSPIETF NEMO BSPExtension of Mobile
IPv6
Mobile Router (MR)Operates Mobile IPv6Establishes a bi-directional
tunnel to its corresponding Home Agent (HA)
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Control signaling protocol for establishing, maintaining and terminating multimedia sessions.Pre-callMid-call
Session Initiation Protocol (SIP)Session Initiation Protocol (SIP)
SIP Mobile IP
Application layer protocol Network layer protocol
Indirect routing in IPv4
Encapsulation overhead
Authentication of redirection
IP stack needs to be changed.
Host/Terminal Mobility, Session Mobility, Personal Mobility, and Service Mobility
Host/Terminal Mobility
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SIP-based Network MobilitySIP-based Network MobilityThree types of SIP Back-to-
Back User Agent (B2BUA)SIP Home Server (SIP-HS)SIP Network Mobility Server
(SIP-NMS)SIP Foreign Server
(SIP-FS)Two Lists
Binding ListSession List
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Header TranslationHeader TranslationIn order to avoid problems due to tunneling
For a REGISTER request
•For an INVITE request
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Route OptimizationRoute Optimization
[email protected] (URI)
[email protected] (Contact)
[email protected] (URI)
[email protected]. com.tw (Contact)
sip-nms@visited. network. com.tw
sip-nms@visited. network. com.tw
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NestingNestingSIP-NEMO can keep almost the same performance even if
the nesting level is increasing.
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A Network-Aware P2P File Sharing A Network-Aware P2P File Sharing System over the Wireless Mobile Network System over the Wireless Mobile Network EnvironmentEnvironment
Chung-Ming Huang, Tz-Heng Hsu and Ming-Fa Hsu,Laboratory of Multimedia Mobile Networking
Department of Computer Science and Information Engineering
National Cheng Kung UniversityTaiwan, R.O.C.
IEEE Journal on Selected Areas in Communications (JSAC), VOL. 25, NO. 1, pp.204-210, January 2007.
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IntroductionIntroduction : P2P : P2P Overlay NetworksOverlay Networks
Application layer Flexible design
TopologyMaintenanceProtocol
Transparent to the underlyed IP network
DisadvantagesLonger latencySetup and maintenance
overload
overl ay network
physi cal network
routers
the overlay link
the physical link
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Introduction (cont)Introduction (cont) Traditional P2P file sharing applications do not support mobility,
making it difficult for mobile users to retrieve files in wireless mobile networks.
Two concerns that affect resource discovery and retrieval in wireless
mobile networks arePeers’ movements in wireless mobile networks Peers’ join and leave in a P2P file sharing network.
The routing path’s change may affect the performance of data transmission, e.g., the transmission rate.
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Introduction (cont)Introduction (cont)
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Introduction (cont)Introduction (cont) To enable continuous resource discovery and file retrieval for mobile users in
wireless mobile networks, we proposed a novel network-aware P2P architecture.
The proposed network-aware P2P file sharing architecture has a mobility-aware file discovery control (MAFDC) scheme that can obtain fresh status of
participant peers and reduce the number of messages that are used to discover peers in the wireless network environment
a resource provider selection (RPS) algorithm to select a new resource provider for mobile peers that encounters connection broken in wireless mobile networks
an identical file matching (IFM) algorithm to identify whether two files in a P2P file sharing network are the same or not.
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System ArchitectureSystem Architecture
The network-aware P2P architecture divides a P2P file sharing network into multiple network-aware clusters.
Peers are assigned to a network-aware cluster using a network prefix division.
All files within the same cluster are searched first, which can speed up the resource discovery in the wireless mobile network environment.
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Mobility-Aware File Discovery Control SchemeMobility-Aware File Discovery Control Scheme
When peers leave a P2P file sharing network, hosts that retrieve files from these peers will lose connection and the data transmission will be interrupted.
Sending discovery messages periodically is a way to obtain fresh status of peers that share files.
However, it may waste network bandwidth if each mobile peer sends messages periodically to discover new peers.
To solve this problem, we propose a mobility-aware file discovery control (MAFDC) scheme to reduce the number of messages that are used to discover resource providing peers in the wireless mobile networking environment.
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Mobility-Aware File Discovery Control SchemeMobility-Aware File Discovery Control Scheme
There are two kinds of query modes for mobile peers to discover new resource providing peers: Publish-subscribe query mode
to reduce the number of messages to discover new resource providing peers. Continuous query mode.
to solve the resource discovery problem when a mobile peer u is located within a firewall.
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Layer 7 Multimedia Proxy Handoff using Layer 7 Multimedia Proxy Handoff using Anycast/Multicast in Mobile NetworksAnycast/Multicast in Mobile Networks
Chung-Ming Huang and Chao-Hsien LeeLaboratory of Multimedia Mobile NetworkingDepartment of Computer Science and Information EngineeringNational Cheng Kung UniversityTaiwan, R.O.C.
IEEE Transactions on Mobile Computing, VOL. 6, NO. 4, pp. 411-422, Apr. 2007. (SCI, EI)
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Three-tier ArchitectureThree-tier Architecture
Traditional Advantage : CacheReduce the initial waiting timeSave bandwidth consumption
The 3-tier architecture can help to improve performance due to handoff.From one network to another one
Proxy servers can adapt the quality of requesting data.From one device to another one
Proxy servers can determine the session status of the same client.
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Problem StatementProblem Statement
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Taipei
Taichung
Tainan
Kaohsiung
Subnet B
Subnet A
Internet
Server
Proxy A
Proxy BMobile Node
Why does the MN still connect to the server via Proxy A ?
L7 Proxy HandoffRegarding user
mobility, clients should switch their own proxies dynamically.
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Issue 1: Proxy SelectionIssue 1: Proxy Selection
How to determine the most suitable proxy as the next proxy?Many proxy servers are distributed in the Internet.Each proxy provides each MN different qualities of services.
We adopts “application-layer anycast”.A packet targeted to an anycast domain name (ADN) is
routed to the most appropriate node.The meaning of “most appropriate” is defined by users via
anycast metrics.
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Client-driven Proxy SelectionClient-driven Proxy SelectionProxy servers are divided into
anycast groups based on its located subnet.IPv6 hierarchical addressing
We use one pre-defined site-local multicast address as the ADN.
Group B
FF35::101
Group A
FF35::101
Media Server
Proxy Proxy
Proxy
Proxy
Proxy
Proxy
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Issue 2: Buffer ForwardingIssue 2: Buffer ForwardingHow to recover the original session in the next proxy?
The next proxy may cache useless data for this MN.The MN needs to wait a period of time to let the next proxy request data
from the server.
We takes “IPv6 multcasting” into consideration.
the next proxy’s joining the multicast group
the original proxy’s leaving the multicast group>
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Session Recovery SchemeSession Recovery Scheme
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Performance EvaluationPerformance EvaluationWithout proxy handoff support
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Performance EvaluationPerformance EvaluationWith proxy handoff support
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Intersection Collision WarningIntersection Collision Warning
Chung-Ming Huang, Shih-Yang Lin, Chia-Ching Yang, Chih-Hsun Anthony Chou
Project of Institute for Information Industry - WAVE-based DSRC Safety Applications Development
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Intersection SafetyIntersection Safety
A
B
Vector
A
BA
B
Collide
After Several Seconds
OR Safe
How to know it is safety or not before several seconds?
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Intersection Collision Warning (ICW)Intersection Collision Warning (ICW)
GoalsProvide accurate pre-warning information before several
seconds.Pre-warning information can help drivers safely driving on
roads.Reduce probability of accident occurs.Warning level can be defined by the user himself.
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Three parameters provided by ICWThree parameters provided by ICWCPA (Closest Point of Approach)TCPA (Time to Closest Point of Approach)DCPA (Distance to Closest Point of Approach)
A
B
Vehicle ATCPA : 3 sDCPA : 4 mWarning : Safety
Vehicle BTCPA : 3 sDCPA : 4 mWarning : Safety
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System structureSystem structure
Part 1 : Information Collection
Part 2 : Calculation
Inter-Vehicle Communication
Relationship Information, RI
Vector Info.
Course Info.
Warning
HighMiddle
Low
CPACalculation
Collision Warning
Part 3 : StorageSaving relation information to
Storage
Filter
RI includes position information, velocity, direction, acceleration, vehicle identify, etc.
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SimulationSimulation
Using NS-2 simulation software.Based on WAVE communication.
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Results - IResults - I Number of vehicles : 2 Number of lanes : 2 Included angle : 10, 30, 45, 60, 90
Lane 2
A
B
α = 10, 30, 45, 60, 90
Accuracy Rate : Whether or not send out the warning message before vehicle collides.
ICW accuracy rate : 100%
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Results - IIResults - II Number of vehicles : 40~80 Number of lanes : 4 Included angle : 90
Accuracy Rate : Whether or not send out the warning message before vehicle collides.
6000m
6000m
Line 1
Line 2
Line 3
Line 4
ICW Accuracy
98
98.5
99
99.5
100
100.5
10 15 20 25 30 35Velocity (m/s)
Acc
urac
y (%
)
40 Vehicles
60 Vehicles
80 Vehicles
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EmergencyEmergency Vehicle Approach Vehicle Approach
Chung-Ming Huang, Chun-Yu Tseng, Chia-Ching Yang, Chih-Hsun Anthony Chou
Project of Institute for Information Industry - WAVE-based DSRC Safety Applications Development
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Emergency Vehicle ApproachEmergency Vehicle ApproachDesign a mechanism for emergency vehicle to reach
destination quickly and safelySave timeNotify the approaching warning to nearby vehiclesHandle exception accident in the route of emergency vehicle
Traffic jamCar accidents
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System ArchitectureSystem ArchitectureThere are four components in our proposed system
Two types of vehiclesEmergency vehicleNearby vehicles
There is a centralized server with the operations of management and calculation
RSU (road side unit) are deployedThey can forward/broadcast the message
Upload traffic information (average speed) to server periodically
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AlgorithmsAlgorithmsPath arrangement
Paths for emergency vehicles to pass is arranged by ServerDPA (dynamic path arrangement) mechanism
Dynamic(D) pathWithout DPA mechanism
Primary(P) path Secondary(S) path P-S path
A* algorithm is adopted to determine the P/S/D pathAdjust weight to avoid overlap between P and S
Server adopt BFS to determine the P-S path
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Data disseminationData dissemination
IPA (Initial Path Arrangement) messageSent by emergency vehicle to get P,S and P-S path initially
Evacuation messageSent by emergency vehicle to notify the warning to nearby vehicles
Traffic informationAdopted by RSUs to upload traffic information to server
Alert messageSent by server to notify traffic accidents to emergency vehicle
DPA (Dynamic Path Arrangement) messageEmergency vehicle communicates with server by this message to
maintain a dynamic path
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Experimental result (1)Experimental result (1)• Optimization of P, S and P-S path
In A* algorithm– Weight value (cost of edge) is assigned to every edge– To avoid overlap between P and S, we define the weight factor of P (WP),
which is larger than 1 After calculation of P, weight value of each edge in P is multiplied by WP
Then cost of each edge in P is become larger, they will have lower possibility to be selected during calculation of S In the experiment
If WP ↑, then cost of S ↑ If WP ↑, # of S ↑
In condition : WP <1.1 Results shows that appropriate WP is around 1.08~1.12
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Experimental result (2)Experimental result (2)
We compare the cost of three different mechanisms used by emergency vehicle (EV) in certain condition:Condition 1: accident occurred in primary path
– Performance metrics : average cost The time spent by emergency vehicle (from start point to destination)
Result• Original path
– EV takes P-path – Average cost: 443.70 (seconds)
• Alternative path– EV takes P-path first, then switches to S-path when accidents occurred in P-
path– Average cost: 306.24
• DPA– EV periodically connects to server to maintain the dynamic path– Average cost: 252.41
Performance : DPA(best) > A. > O.
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Experimental result (2)Experimental result (2)
Condition 2: accidents occurred in both primary path and secondary pathResult
• Original path– EV takes P-path – Average cost: 436.61
• Alternative path– EV takes P-path first, then switches to S-path when accidents
occurred in P-path – Average cost: 473.43
• DPA– EV periodically connects to server to maintain the dynamic path – Average cost: 255.68
Performance : DPA(best) > O. > A.
P-S path is additional path
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Potential ResearchesPotential Researches
Vehicular Telematics have great research potentials, due to:New Services never stop coming out;Wireless communication’s bother from speed inherently existsTraditional techniques usually aim at fixed or low mobility
scenarioMore to do?
As new standards or drafts appears, measurement may be differentTechniques to improve the performance for new standards or draftV2V, V2I or Hybrid architecture may be harnessed for different
servicesApplication with location information with and without GPS (for
sometimes GPS is not available, such as tunnel or in-building carport)
Special application related
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Conclusion of the talkConclusion of the talk
Telematics is a promising Technology and Research area
Industry, Standard Org. and Academics all show great interests on it
Challenging Researches aim at the technical and standardization problems in provisions of various of services under vehicular condition
Innovation and brainstorming are desired to push Telematics further forward
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ThankThanks!s!ThankThanks!s!