1 National Transportation Communications for ITS Protocol.

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National Transportation Communications for ITS Protocol

National Transportation Communications for ITS Protocol

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National Architecture & NTCIP

NTCIP Center-to-Field

NTCIP Center-to-Center

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Message Set Standards Message

Communications Standards

DataDataElementElement



Data Element Standards


ITS

Stan

dard

s Pe

rspe

ctiv

e

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Data Elements Standards

1. Traffic Management Data Dictionary (TMDD)2. NTCIP- Data Dictionary for Each Device3. TCIP- Data Dictionary for each Transit Application

1. Traffic Management Data Dictionary (TMDD)2. NTCIP- Data Dictionary for Each Device3. TCIP- Data Dictionary for each Transit Application

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Message Sets Standards

4. Message Sets for External TMC Communications (MS/ETMCC)5. Message Sets for Incident Management

4. Message Sets for External TMC Communications (MS/ETMCC)5. Message Sets for Incident Management

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Communications Protocol Standards

6. Center to Field Communications Protocols

7. Center to Center Communications Protocols

DATEX-ASN ; CORBA

6. Center to Field Communications Protocols

7. Center to Center Communications Protocols

DATEX-ASN ; CORBA

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• Message Set Standards• External TMC (ITE)• Incident

management (IEEE)• ATIS (SAE)

ITS Derived Standards

Message




• Data Element Standards • TMDD (ITE)• NTCIP (AASHTO, ITE,

NEMA)• Object definitions

for traffic signals,message signs,transit (a.k.a. TCIP)

• ATIS (SAE)

• Communications Standards• IP, HDLC

framing (NTCIP effort)

• DSRC (ASTM)

• NTCIP Class B (NTCIP)

TMCTMC

Center, roadside, traveler, vehicle subsystems


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Message Set Standards



• TMDD Section 3 - Traffic Control • NTCIP NEMA TS 3.4 - Global• NTCIP NEMA TS 3.5 - ASC

• Message Sets for External Traffic Management Center Communications (MS/ETMC2)

Traffic ControllerStandards

Topics

• Class B• SP-PPP• TP-Internet• AP-STMF

Class D Profile

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Message Set Standards



• TMDD Section 3 - Traffic Control • NTCIP NEMA TS 3.4 - Global• NTCIP NEMA TS 3.6 - DMS

• Message Sets for External Traffic Management Center Communications (MS/ETMC2)

DMSStandards

Topics

• SP-PPP• TP-Internet• AP-STMF

Class D Profile

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Building Blocks From

International Standards OrganizationISO

– Language to Define Data Elements : ASN.1

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Building Blocks From The Internet Authority

2. Rules ( Protocols) to Transport Data Elements

– SNMP, TCP/IP, UDP etc.

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Open System Interconnect- Reference Model OSI-RM

Each layer independently performs a specific task

Application

Session

Transport

Physical

LinkNetwork

Presentationmessage data stream

bits

data frames

segments

dialog connection

API

network address packets

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Off-the-Shelf Protocols Examples

Application

SessionTransport

Physical

LinkNetwork

PresentationSNMP

RS 232

PPP

UDP

IP

HDLC

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First NTCIP Objective is:

Develop Data Dictionaries &

Communications Protocols

System

USER Work Station

Communications Profiles

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System

Second NTCIP Objective is:Develop Communications Protocols for Center to Center Information Exchange

System

CommunicationsProtocols

1628

Devices2

dynObjDef1

dynObjData2

protocols1

layers1

profiles2

dynObjMgmt3

Class B1

rs232Async2rs232

1hdlc

3

snmp5

trans4

system6

asc1

ramp2

dms3

camera4

sensors5

global6

NEMA1206

private3

transportation4

experimental 2

mgmt1

NTCIP Standards Organization1 2Protocols Dictionarie

s

Twisted Pair

UDPTCP

IP

Null

Subnetwork

Information

Transport Transport

Application

Information

Subnetwork

Dynamic ObjectsReference Model

Files Data Objects

ITS Message Sets

SLIP PPP PMPPFDDI EthernetATM

SONET V Series Modem FSK Modem

Plant Plant

*

* Not all Subnetwork / Plant combinations are feasible

NTCIP Standards Framework

Fiber Coax Telco Line Wireless

FTP TFTP SNMP STMPCORBA DATEX

Application

Center-to-Center Center-to-Field

ITS Data Model ITS Data Dictionary

Topic- 2 NTCIP Roadmap

An Analogy that

Describes the

“Mechanics of NTCIP”

NTCIP Roadmap Analogy

Cardiology

History Street Address

Completion of a medical history form that uses a dictionary of terms and mails the form to a medical professional for action.

#1 - Objects Are NTCIP Data Building Blocks

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phaseWalk OBJECT-TYPESYNTAX INTEGER (0..255)ACCESS read-writeSTATUS mandatoryDESCRIPTION "Phase Walk Parameter

in seconds (0-255 sec). This shall control the amount of time the Walk indication shall be displayed. "

::= { phaseEntry 8 }

Word

Def•i•ni•tion \ def- -nish- n\ n: a word or phrase expressing the essential nature of a person or thing.

e e

Definitions are structured with syllabic spelling, pronunciation, grammatical usage, definition, etc.

NTCIP data elements are defined

for transmission using ASN.1 structure and are called objects.

Object

NTCIP “Speak”Analogy

#2 - NTCIP Data are Hierarchically Organized

Alphabet

Organizes definitions in an alphabetical structure.

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Organizes objects in a hierarchicalstructure.

ISO Tree

A B C D E F G H A B C D E F G H I J K L M N O P I J K L M N O P Q R S T U V W Q R S T U V W

X Y ZX Y Z

ISO, 1

Organization, 3

ISO-CCITT, 2

Country, 16

USA, 640

Organization, 1

DOD, 6

Internet, 1

Private, 4

Enterprises, 1

NEMA, 1206

ROOT



#3 - Device Standards areSubject Matter Dictionaries

Collections of definitions in alphabetical structure for subjects.

Subject Matter Dictionaries

Collections of objects in hierarchical structure for subjects.

NTCIP Standards

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Dermatology

Psychiatry

Cardiology

TS 3.4TS 3.5TS 3.6TS 3.7

#4 - Object Subset Needed for Application


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Words Needed for a Specific Use

Subset of a subject area for a specificpurpose. E.G., heart disease historyuses only some medical terms.

History

Cardiology

Management InformationBase (MIB) Module

MIB Module is a collection of objects for a specific application (agency specific).

MIB forSignals

in City “A”

#5 - Objects Are Written According To Procedures

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A paper form might be the“device” on which we wouldwrite a heart disease history.

Filling In a Form

History1. Print all

responses.2. Use a no. 2

pencil.3. Answer parts

1 & 2 only.4. Write from top

to bottom, left to right.

SNMP is a set of rules for reading and writing MIB objects to a device.

Simple Network Management Protocol (SNMP)

SNMPgetsetget-nexttrap

MIB forSignals

in City “A”

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Example of Object: Number of Permanent Messages Parameter

Page 2-14 TS 3.6 dmsNumPermanentMsg OBJECT-TYPESYNTAX INTEGER(0...65535)ACCESS read-onlySTATUS mandatoryDESCRIPTION “Indicates the current number of Messages stored in non-volatile, non—chargeble

memory( e.g. EPROM). For CMS and BOS , this number is the diffent messages that can be assembled.”

::={dmsMessage 1}

Both values are encoded as a pairNote: OID is only a references to data, it is not IP address

OID location in the tree

1.3.6.1.4.1.1206.4.2.3.5.1

This is not a IP Address, only a IN number for data element

#6 - Objects Are Transmitted Using Rules

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Mailing Rules

To transmit the heart history formto a doctor, a patient follows amailing system’s rules.

• US postal service rules.

Open System Interconnect (OSI)

OSI 7 layer reference model (OSI-RM) has rules for transportingand processing the information.

Data processing rules

Data transportrules

• Application• Presentation• Session

• Transport• Network

• Data Link• Physical Physical network rules

#7 - Physical Layer Defines Media7


The heart disease history infocould be submitted on paper,on a disk, on a voice tape, etc.

Media Choice

?History

Defines how to get the bits across the connection (copper, fiberoptic, coaxial).

Physical Media Choices

EthernetSonet

#8 - Data Link Layer DefinesData Packages

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Specifies the packaging rules used to transmit the information.

Street Address

Packaging

History

Describes the data package transmitted over a single link & checks for errors.

High Level Data Link Control (HDLC) Frames

MIB forSignals

in City “A”

Flag Address Control

Info

FCS Flag

#9 - Network & Transport Layers Define Data Addressing and Delivery

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Internet Protocol (IP)

Network layer routes through interconnected network links using Internet compatible rules.

Flag

Address

Control

IPI

Info FCS Flag

User Datagram Protocol (UDP)Transmission Control Protocol (TCP)Internet Protocol (IP)

Addresses the mail. Names the person at the address & repackages into smaller packages if needed.

Add Recipient Name

User Name

AddressAddress

Address

Return ReceiptRequiredTown, State,Zip,

Country

#10 - Top 3 Layers PerformData Processing

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Read the heart disease history form and provide info for physician to act.

Reading the Form

History SNMPgetsetget-nexttrap

SNMP reads & writes MIB objects that have been transmitted using OSI-RM.

Simple Network Management Protocol (SNMP)

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Roadmap Summary - The Data

• Data elements are called objects and defined using a structure called ASN.1.

• Dictionaries of objects for specific applications are arranged by an ISO hierarchy instead of by alphabet.

• The subset of objects needed by an agency is collected into a database called a MIB.

• The procedure for reading and writing this database is termed SNMP. A more efficient version called STMP is applicable in many transportation applications.

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Roadmap Summary - Moving the Data

• The rules for transmitting the data follow the OSI reference model.

• Data is “packaged” into HDLC frames.• Data packages are moved through communications

networks using rules compatible with the Internet Protocols.

Topic-3 Center to Field (Device Level) Communications Profiles

Twisted Pair

UDPTCP

IP

Null

Subnetwork

Information

Transport Transport

Application

Information

Subnetwork

Dynamic ObjectsReference Model

Files Data Objects

ITS Message Sets

SLIP PPP PMPPFDDI EthernetATM

SONET V Series Modem FSK Modem

Plant Plant

*

* Not all Subnetwork / Plant combinations are feasible

NTCIP Standards Framework

Fiber Coax Telco Line Wireless

FTP TFTP SNMP STMPCORBA DATEX

Application

Center-to-Center Center-to-Field

ITS Data Model ITS Data Dictionary

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NTCIP Overview

SNMP Objects Dynamic Obj’s

STMP

IP NULL

PMPP PPP

FSK

RS-232

UDP

SNMP

Cable Air

Phone TWP

RS-232

Modem Radio

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Use of Existing Standards

• Why does the NTCIP re-define all of these standards?– There are unique requirements within the

transportation environment• There are options that are not appropriate for our

environment• There are features that our environment requires that are

not defined in existing standards

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ISO - NTCIP Relationship

Application

Presentation

Session

Transport

Network

Data Link

Physical

Information Level

Application Level

Transport Level

Subnetwork Level

Class Level

Plant Level

ISO NTCIP

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Profiles

• A standard that further restricts the interpretation/use of other standards

• May specify how to combine multiple standards together into a standard package

• Primarily developed to promote interoperable implementations

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Historic Class Profiles

Class B Class A Class CApplication STMF STMF STMFTransport Null UDP/IP TCP/IP

HDLC HDLC HDLCRS232 RS232 RS232

Subnet

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Subnet Profiles

• Defines how data is physically transmitted across a link, including– Physical signals– Addressing– Bit error checking– Permission to speak– Multiplexing of Transport Profiles

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Subnet Profiles

• PMPP232—low-speed, multi-drop via 232• Others Under Development

– Near-Term• PMPP/FSK—Low-speed, multi-drop, over twisted pair• PPP—Dial-up• Ethernet—LANs and other Ethernet systems

– Long Term• FDDI—Fiber systems• SONET—Another fiber option• Metropolitan Area Networks—Equivalent to a LAN

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Transport Profiles

• Routing across a network– Logical to physical address mapping– Delivery times– Error handling

• Fragmentation and re-assembly• Multiplexing of Application Profiles

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Transport Profiles

• Transportation (Null)—Low-speed connections• Internet—Computer industry standard

– UDP/IP– TCP/IP

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Application Profiles

• Defines structure for information exchange– Overall structure of each message– What information gets exchanged– Under what conditions can information be

exchanged– Byte-level encoding formats

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Application Profiles

• Field Communications– SNMP—Computer industry standard– STMP—Low-speed, high data exchange req’ts

• Center-to-Center Communications– DATEX-ASN—Simple structured solution based on messages– CORBA—Advanced object-oriented solution

• General Use– FTP—Standard file transfer– TFTP—Simple file transfer where TCP not available or

frequent transfers

1 National Transportation Communications for ITS Protocol.

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