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BS EN ISO 14819-1:2021

BS EN ISO 14819-1:2021

$198.66

Intelligent transport systems. Traffic and travel information messages via traffic message coding – Coding protocol for Radio Data System. Traffic Message Channel (RDS-TMC) using ALERT-C

Published By Publication Date Number of Pages
BSI 2021 68
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The ALERT-C protocol is designed to provide mostly event-oriented road end-user information messages.

This document specifies the messages which are presented to the user in accordance with a set of general requirements. It defines the message structure and content and its presentation to the end-user.

The message management component of this document describes the message management functions of RDS-TMC. The ALERT-C protocol distinguishes between user messages and system messages. User messages are those potentially made known to the end-user, as defined in Clause 5. System messages are of use only to the RDS-TMC terminal, for message management purposes.

RDS-TMC information comprises both ‘system information’ and ‘ user messages’. System information relates to the TMC service and details the parameters that the terminal needs to be able to find, identify and decode the TMC information. System information is transmitted in type 3A groups and in type 8A groups.

User messages contain the details of the traffic events; these may use one or more type 8A groups. Most messages may be transmitted using a single type 8A group, however messages with more detail (e.g. diversion advice) may use up to a total of five, type 8A groups.

The transmission component of this document conveys the messages over-air. The ALERT-C protocol, used by RDS-TMC, has the fundamental approach of aiming to code most messages entirely within a single RDS group.

The ALERT-C Event List, which contains all event descriptions, is described in ISO 14819?2.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 Foreword
9 Introduction
13 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
17 3.2 Abbreviated terms
18 4 Application
4.1 General
4.2 Definition of the TMC “travel service”
19 4.3 TMC virtual terminal
4.4 Event-orientated end-user information messages
4.5 Strategic and tactical information
20 4.6 Geographic relevance
4.7 Transmitted message priority
21 4.8 Event List
4.9 Future extensions
5 Presentation
5.1 General
5.2 TMC virtual language
22 5.3 Message content
5.3.1 General
5.3.2 Event description (11 bits)
5.3.3 Primary location (16 bits)
23 5.3.4 Direction and extent (4 bits)
5.3.5 Duration (3 bits)
25 5.3.6 Diversion advice (1 bit)
26 5.4 Implicit information
5.4.1 Road class and road number
5.4.2 Road segment
5.4.3 Area, region and country
5.4.4 Pre-assigned diversion advice
5.4.5 Urgency within the terminal
27 5.4.6 Directionality
5.4.7 Duration type
5.4.8 Nature
5.4.9 Update class
5.4.10 Quantifier type
5.5 Optional message content
5.5.1 General
28 5.5.2 Combination of additional information
5.5.3 Control codes (label 1)
29 5.5.4 Length of route affected (label 2)
5.5.5 Speed limit (label 3)
5.5.6 Additional quantifiers (labels 4 and 5)
30 5.5.7 Supplementary information (label 6)
5.5.8 Start and stop times (labels 7 and 8)
5.5.9 Multi-event messages (label 9)
31 5.5.10 Detailed diversion instructions (label 10)
5.5.11 Destinations (label 11)
5.5.12 Precise location reference (label 12)
32 5.5.13 Cross linkage to source of problem (label 13)
5.5.14 Separator (label 14)
33 5.5.15 Other information as defined by sub-labels (label 15)
5.5.16 Reference to telephone services (label 15, sub-label 1-2)
36 6 Message management
6.1 General
37 6.2 System messages
6.2.1 General
6.2.2 Location table
6.2.3 Terminal requirements
38 6.2.4 Change of database numbers
6.3 Message repetition
6.4 Message updating
39 6.5 Message deletion
6.5.1 General
6.5.2 Message persistence
40 6.5.3 Detailed stop-time
6.5.4 Non-silent and silent cancellation messages
6.5.5 Null message
41 6.6 Message presentation
6.7 Out of area referencing
6.7.1 Structure of the INTER-ROAD concept
42 6.7.2 INTER-ROAD messages
6.7.3 Updating and cancellation of INTER-ROAD messages
43 7 Transmission using RDS type 8A and type 3A groups
7.1 General
7.2 Format of type 8A groups
7.3 Group repetition
44 7.4 Single-group user messages
45 7.5 System messages
7.5.1 General
7.5.2 System information
48 8 Method of encrypting an RDS-TMC service
8.1 General
49 8.2 Summary of TMC data elements in type 3A groups
8.3 Summary of TMC data elements in type 8A groups
8.4 Principles of the Encryption and Conditional Access methodology
50 8.5 Encryption by the service provider
8.6 Use of type 8A groups for RDS-TMC encryption
51 8.7 Encryption Administration group
8.7.1 General
8.7.2 Service identifier (SID)
8.7.3 Encryption identifier (ENCID)
52 8.7.4 Location table number before encryption (LTNBE)
8.7.5 Test Bits
8.8 Encrypting location codes
8.8.1 General
53 8.8.2 Test mode
8.8.3 Repetition rate
54 8.9 Access to decrypted services by a terminal
8.10 ‘Activation’ of a terminal
8.10.1 General
8.10.2 Serial number of terminal
55 8.10.3 Access profile (ACP)
8.10.4 PIN code composition
8.10.5 Implementation rules for PIN codes
8.11 Identifying an encrypted RDS-TMC service
56 8.12 Decrypting location codes
57 8.13 Alternative encryption strategy
9 Following an RDS-TMC service
9.1 General
58 9.2 System information repetition rates
9.3 Tuning information
9.3.1 General
9.3.2 Format of the Tuning Information
60 9.3.3 Conditions for using tuning information
61 9.3.4 Repetition rate
9.4 Multi-group messages
9.4.1 General
62 9.4.2 First group
63 9.4.3 Subsequent groups
64 9.5 Summary of X-bit usage in RDS-TMC type 8A groups
66 Bibliography

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BS EN ISO 14819-1:2021
$198.66