future communication between outstations and centres – a concept for the german motorways

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y Future Communication between Outstations and Centres –

A Concept for the German Motorways

Eike PögelHeusch/Boesefeldt GmbH

Dr. Lutz RittershausFederal Highway Research Institute - BASt

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Future Communication between Outstations and Centres – A Concept for the German Motorways

Eike Pögel, Heusch/Boesefeldt GmbHDr. Lutz Rittershaus, BASt

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Implementation of an ITS-system in Germanysince about 30 years.

1975: VRZ Aichelberg

2005: VZ Hessen

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Average daily traffic (ADT) on German highways.

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Current and planned (till 2007)

systems: 1.200 km

Section Management

1.700 km Network Management

Programme on traffic management for the federal motorways in Germany.

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ForeignTraffic Centre

Traffic Control Centre

Traffic Control Centre

Sub-CentreSub-Centre

OutstationOutstation

Detectors, Variable Message Signs, ...

Detectors, Variable Message Signs, ...

Directives

TCC

SC

OS

SC SC

OS OS

Regional Traffic Information

Centre Communication interface to external Systems (e.g. Datex)

Communication interface to external Systems (e.g. Datex)

Instructions for the Equipment of Traffic

Control and Sub Centres (MARZ),

"AK VRZ"

Instructions for the Equipment of Traffic

Control and Sub Centres (MARZ),

"AK VRZ"

Technical Specifications for Outstations (TLS)

Technical Specifications for Outstations (TLS)

Traffic Control System Germany.

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Roadside Outstation

Roadside Outstation

Traffic Control Centre /

Sub-Centre

Traffic Control Centre /

Sub-Centre

TLS: Technische Lieferbedingungen für Streckenstationen / Technical Specifications for Outstations

Basic idea of the TLS: to define functional groups for roadside equipment, to standardise the interfaces and communication protocols, to create a common data modelling, to make the equipment of different suppliers compatible, to define and test performances and to allow open and clear tendering and system operation.

Interface between Outstations and TCCs.

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Structure of TLS.

FG 0: Reserved for testing purposes FG 1: Traffic data acquisition FG 2: Weight in motion FG 3: Environmental data acquisition FG 4: Variable message sign and variable direction sign control FG 6: Operational messages and control FG 7: Control of external systems FG 8: Speed control systems FG 9: Ramp metering FG 10 to 127: Reserved for subsequent universal definitions FG 128 to 253: Res. for manufacturer defined function groups FG 254: System control (internal) FG 255: Reserved for special applications

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Example of an Outstation.

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Preliminary Issue in 1988, content: Traffic data acquisition

Issue in 1990 with additional features on communication

Issue 1993: first complete edition, compulsory for roadside traffic control equipment

Main Draft in 1997 Issue 2002: optimised, revised edition Issue 2007 in preparation: new communication

technique and additional features

History of TLS.

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Communication restricted by infrastructure of the 80´s Partyline 1200 Baud datagram size <256 bytes Research projects: Recommendations for a new TLS

Communication technology Technical Organizational

Constraints of todays TLS

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Recommendation: „TLS goes TCP/IP“ Todays standard communication protocol Austrian ASFiNAG: Adoption of TLS, but with TCP/IP

extensions NTCIP (USA) based on TCP/IP (UDP) In-field communication: PROFIBUS -> PROFINET TT: DATEX(2)

TCP/IP

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With introduction of TCP/IP broad range of technologies available Fiber optics Twisted pair WLAN GSM/GPRS

Hard- and software vendors Conclusion: Motorway communication infrastructure as

network

Hardware Infrastructure

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TLS-ISO/OSI Layer 7 Actual TLS-datagramm description

Bits&bytes Paperwork, not toolbased Ambigous Error-prone interpretation Weak modelling

Data Modelling (1/3)

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Data Modelling (2/2)

Tool: UML as platform independent modelling language

TLS-datagrams as UML packages and class diagrams

TLS procedures as UML sequence diagrams UML profiling for various aspects possible

XML profiles SOA profiles (e.g CORBA, SOAP) „old TLS“ profile (->backward compatibility)

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TCC/SC networks firewalled IP communication between outstation and TCC/SC Outstations become part of TCC/SC network Potential breach of security Recommendation: Tunneling (ssh/ssl) Point-to-point communication: Portforwarding Strong encryption: Verifies data integrity Public-private-key authentication

Security aspects

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TCC/SC Applications

SOAP/TCP/IP

application levelgateway

TLS-OSI1-7

Migration Strategy

TLS-OSI1-7

outstationfunctional

groups

SOAP/TCP/IP

outstationapplications

field

bus

/pa

rty

line

netw

ork

infa

stru

ctur

e

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Concept based on TCP/IP OTS communication hard- and software Exact data modelling Backward compatibility: Migration concept allowing for

integration of old and new TLS infrastructure Recommendation: Concept study of a TCP/IP/SOA(P)-

based TLS system

Consistent TLS-communication concept

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This working group consists of representatives from: Road operators (German road administrations) Sensor and VMS manufacturer Traffic control centre manufacturer Engineering and consulting companies

Creation of TLS.

The further development of the TLS is be done by the AK TLS (Working Group TLS).

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A modular loose-leaf document system allow the actualisation and release of single chapters without releasing a complete new edition.

Updates and corrections should in the future be initiated by any member of the TLS community using a RFP/RFC procedure, moderated by BASt.

Updating of TLS.

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Thank you for your attention

Dr.-Ing. Lutz Rittershaus

Federal Highway Research InstituteTelematics, Traffic ManagementBrüderstraße 5351427 Bergisch GladbachGermany

[email protected]

Eike Pögel

Heusch/Boesefeldt GmbHTransport TelematicsTempelhofer Straße 4-652068 AachenGermany

[email protected]

future communication between outstations and centres – a concept for the german motorways

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