CEN/TS 14821-1:2003

SLOVENSKI STANDARD
01-oktober-2003
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Traffic and Travel Information (TTI) - TTI messages via cellular networks - Part 1:
General specifications
Verkehrs- unds Reiseinformationen (TTI)-TTI-Nachrichten über mobile Netzwerke- Teil
1: Allgemeine Spezifikation
Ta slovenski standard je istoveten z: CEN/TS 14821-1:2003
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 14821-1
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
May 2003
ICS 35.240.60
English version
Traffic and Travel Information (TTI) - TTI messages via cellular
networks - Part 1: General specifications
This Technical Specification (CEN/TS) was approved by CEN on 10 May 2001 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available. It
is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible
conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 14821-1:2003 E
worldwide for CEN national Members.

Table of contents
PAGE
1SCOPE 5
2 NORMATIVE REFERENCES 6
3 DEFINITIONS AND ABBREVIATIONS 7
3.1 Definitions 7
3.2 Abbreviations 9
4 ARCHITECTURAL ELEMENTS 14
4.1 System Overview 14
4.2 Time Base 14
4.3 Communication 14
4.4 Mandatory Terminal Functions 17
4.5 Error Handling 17
ANNEX A. (INFORMATIVE) ARCHITECTURE DESCRIPTION 18
A.1 General 18
A.2 System Overview 18
A.3 Protocol Architecture 19
A.4 Information Flow 20
A.5 Logical Architecture of a Terminal 23
A.6 Logical Architecture of a Service Centre 29
ANNEX B. (INFORMATIVE) BASIC SERVICE OVERVIEW 31
B.1 General 31
B.2 Breakdown Service 31
B.3 Emergency Service 34
B.4 Interactive Traffic Information Services 35
B.5 Broadcast Traffic Information Services 36
B.6 Navigation Services 37
B.7 Operator Services 38
B.8 Floating Car Data Collection 39
B.9 General Information Services 39
BIBLIOGRAPHY 41
Foreword
The document (CEN/TS 14821-1:2003) has been prepared by Technical Committee CEN/TC 278 " Road
transport and traffic telematics", the secretariat of which is held by NEN, in collaboration with Technical
Committee ISO/TC 204 " Transport information and control systems".
This Technical Specification was prepared by Working Group 7 of CEN TC 278. In the field of Traffic and
Traveller Information, the innovative rate is high, with many research and development projects under way in
many countries, and there is a need to establish prospective Technical Specifications which allow
manufacturers to introduce competitive products to the market in the knowledge that they can accommodate
the future issues of the Technical Specification(s) without fundamental change to equipment.
No known national Technical Specifications (identical or conflicting) exist on this subject.
CEN/TS 14821 consists of eight parts; one part describing the framework and seven parts providing detailed
specifications of all components, protocols and services that are within the scope of CEN/TS 14821.
In order to utilise even subsets from this Technical Specification and to over co-existence with other,
proprietary protocols as requested by the market, it is planned to introduce an additional layer for routing
purposes. This TLV concept is currently under investigation and may be proposed as an additional part to
this Technical Specification.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
Traffic and Traveller Information (TTI) may be disseminated through a number of services or means of
communication, covering static displays, portable terminals and in-vehicle equipment.
For all such services, the data to be disseminated, and the message structure involved in the various
interfaces, require clear definition and standards formats in order to allow competitive products to operate
with any received data.
This Technical Specification focuses on an application data specification whereby data is produced at a
central location and is disseminated via a cellular radio network. It addresses the data specifications for both
downlink and uplink existing between a central location and randomly located vehicles. It enables messages
to be exchanged between different systems and service providers adopting a variety of applications
specifications.
Other Technical Specifications are being produced by the CEN TC278 Working Group 4 to cover TTI
dissemination via other means or services. This set of specifications is named GATS (Global Automotive
Telematics Standard). GATS provides the modular framework for implementing such traffic telematics
services on an open technology platform and is network - independent. In many details definitions are
necessary to ensure interoperability. Therefore, those detailed definitions are given in CEN/TS 14821-8. With
the development of future mobile communication systems towards UMTS / IMT2000 the bottleneck of
narrow-band data communication might fade. Due to its modular structure, the GATS framework and
applications are prepared for that due to its network-independence. The same holds for emerging
technologies for positioning which today is almost exclusively based on GPS.
Other relevant standard developments are, independent from telematics, the application-independent
Wireless Application Protocol (WAP), enabling mobile access to the Internet. It is understood that these
emerging technologies might fit into the framework of telematics applications in future WAP-versions. For the
time being, GATS already today independently from WAP enables access to telematics services. Utilisation
of GATS on a WAP protocol stack and identifying necessary adaptation of WAP specifications (if any) is
currently under investigation of the appropriate groups within WAP-Forum and GATS-Forum.
1 Scope
This Technical Specification defines the specific interfaces and functionality of traffic telematics (TT) services
based on the use of cellular networks. Device manufacturers are enabled to develop terminal equipment
compatible to services based on this standard. This will allow for interoperability of different terminal
equipment and service providers which allows competition between service providers and terminal
manufacturers. Furthermore it sets the scene for international availability of these services.
This Technical Specification specifies
• TT-specific interfaces between terminal and service centre. This especially incorporates the message

sets of the application data protocols and the service-independent communication handling (including
conditional access and transport protocols).
• Functionality, procedures and requirements of basic terminal components as well as their interaction with
the service centre. This especially comprises conditional access and security mechanisms.
• Service Specifications, which are essential to ensure consistent behaviour of terminal and service centre.
The services incorporated within this issue comprise:
• breakdown and emergency services

• interactive traffic information services

• broadcast traffic information services
• navigation services (route assistance, route advice, homing)
• operator services
• general information services

• floating car data collection
It is envisaged that future research and development will lead to improvements on the services listed above
as well as to the creation of new services. Nevertheless this Technical Specification provides the framework
for seamless integration of new features and services into the existing architecture.
2 Normative references
Not applicable.
3 Definitions and abbreviations

3.1 Definitions
For the purposes of this Technical Specification, the following terms and definitions apply:
3.1.1 Attribute (of a Traffic Information Message)

A Traffic Information Message is made up of separate parts that can be called attributes. This includes, for
example, an item of information and a length of validity.
3.1.2 Authorisation
Reciprocal proof that the identity provided by the communications partner is valid
3.1.3 Broadcast Service
Data service within a cellular wireless network that allows for mono-directional dissemination of data from a
service centre to multiple users in the area of signal reception
3.1.4 Bypass Description
Representation of a Bypass, consisting of a Bypass Hint and/or a Bypass Route.
3.1.5 Bypass Hint
Representation of a hint for a Bypass
3.1.6 Bypass Link
Prominent waypoints on a Bypass Route
3.1.7 Bypass Route
Representation of the route for a Bypass
3.1.8 Cell Broadcast
Broadcast service of the GSM network
3.1.9 Data telegram
Digital message exchanged between two systems
3.1.10 Delivery Notification
Network acknowledgement for successful/ unsuccessful delivery of a message to the mobile device
3.1.11 Functional Road Class
A classification based on the importance of the road element in the connectivity of the total road network
3.1.12 Functional Road Class 0

Motorways
3.1.13 Functional Road Class 1

All non-Motorways that are part of a connection used for nation wide traffic and transport
3.1.14 Geocode
Geocodes are unique identifiers unmistakably defining important points on road networks. Geocodes can be
derived from / converted into WGS84 co-ordinates by the algorithm described in CEN/TS 14821-3.
3.1.15 Hardware service agents

Partner companies of the traffic telematics service providers who are authorised to install onboard equipment
into vehicles and to maintain it
3.1.16 Homing
Simple form of guidance to destination, in which the direction and
straight-line distance of the destination are indicated
3.1.17 Information Element
Information unit of a message
3.1.18 Intersection
Junction of two or more roads
3.1.19 Length of a Speech Report
Length of a Speech Report, including pauses, in tenths of a second
3.1.20 Mobile Originated
Data telegram sent from the onboard equipment to the Service Centre.
3.1.21 Mobile Terminated
Data telegram sent by the Service Centre to the onboard equipment.
3.1.22 Onboard equipment
A system, generally mobile, interacting with the service centre to handle traffic telematics services
3.1.23 Road Junction
Intersection of two or more roads
3.1.24 Route description
Description of a route showing the geometry of street intersections, manoeuvre instructions, street and place
names, and geographical co-ordinates
3.1.25 Service centre
System produced by the traffic telematics operators / service providers to handle traffic telematics services
3.1.26 Short Message Service
Packet-based form of data transfer within the GSM network
3.1.27 Speech connection
Communications channel between two systems for the bi-directional transmission of speech
3.1.28 Speech Report
Traffic Information Report transmitted by a speech system
3.1.29 Terminal Device
Generally mobile system interacting with the service centre for implementation of telematics services
3.1.30 TINFO
Traffic Information Report
3.1.31 TINFO Version
Unique identification of a Traffic Message, consisting of a number and a time stamp
3.1.32 Traffic Data
Data for qualification of Traffic Events. This includes:
Values: speed, traffic flow, traffic density
Places: position, place designation
Facts: description of situation
3.1.33 Traffic Event
An occurrence on a road or in an area that is worthy of reporting, such as a traffic jam, wrong-way driver, or
fog.
3.1.34 Traffic Information
Technical representation of a Traffic Situation within the onboard equipment, accomplished by a number of
Traffic Information Reports.
This Traffic Information can be displayed to the customer via suitable terminals.
3.1.35 Traffic Information Report
Technical representation of a Traffic Event produced by processing traffic data.
Each Traffic Reports uniquely identified by a number, the TINFO ID, a time stamp, the TINFO version.
Note: If the Traffic Event changes, the time stamp changes, but the TINFO ID number does not.
3.1.36 Traffic Situation
The total number of all Traffic Events taking place that deserve reporting within an area. The Traffic Situation
is always linked to an area. Thus, for example, an areas could be a conurbation or a geometrically
demarcated area; an example is the radius around a point.
3.1.37 Voice connection
Circuit-switched channel between two systems for bi-directional voice transmission
3.1.38 Waypoint
Significant points on the route
3.2 Abbreviations
For the purpose of this Technical Specification, the following abbreviations apply:
3.2.1 %
...