BS EN ISO 14819-1:2021 – TC
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Tracked Changes. 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 | 160 |
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 |
|---|---|
| 94 | undefined |
| 100 | Foreword |
| 101 | Introduction |
| 105 | 1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions |
| 109 | 3.2 Abbreviated terms |
| 110 | 4 Application 4.1 General 4.2 Definition of the TMC “travel service” |
| 111 | 4.3 TMC virtual terminal 4.4 Event-orientated end-user information messages 4.5 Strategic and tactical information |
| 112 | 4.6 Geographic relevance 4.7 Transmitted message priority |
| 113 | 4.8 Event List 4.9 Future extensions 5 Presentation 5.1 General 5.2 TMC virtual language |
| 114 | 5.3 Message content 5.3.1 General 5.3.2 Event description (11 bits) 5.3.3 Primary location (16 bits) |
| 115 | 5.3.4 Direction and extent (4 bits) 5.3.5 Duration (3 bits) |
| 117 | 5.3.6 Diversion advice (1 bit) |
| 118 | 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 |
| 119 | 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 |
| 120 | 5.5.2 Combination of additional information 5.5.3 Control codes (label 1) |
| 121 | 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) |
| 122 | 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) |
| 123 | 5.5.10 Detailed diversion instructions (label 10) 5.5.11 Destinations (label 11) 5.5.12 Precise location reference (label 12) |
| 124 | 5.5.13 Cross linkage to source of problem (label 13) 5.5.14 Separator (label 14) |
| 125 | 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) |
| 128 | 6 Message management 6.1 General |
| 129 | 6.2 System messages 6.2.1 General 6.2.2 Location table 6.2.3 Terminal requirements |
| 130 | 6.2.4 Change of database numbers 6.3 Message repetition 6.4 Message updating |
| 131 | 6.5 Message deletion 6.5.1 General 6.5.2 Message persistence |
| 132 | 6.5.3 Detailed stop-time 6.5.4 Non-silent and silent cancellation messages 6.5.5 Null message |
| 133 | 6.6 Message presentation 6.7 Out of area referencing 6.7.1 Structure of the INTER-ROAD concept |
| 134 | 6.7.2 INTER-ROAD messages 6.7.3 Updating and cancellation of INTER-ROAD messages |
| 135 | 7 Transmission using RDS type 8A and type 3A groups 7.1 General 7.2 Format of type 8A groups 7.3 Group repetition |
| 136 | 7.4 Single-group user messages |
| 137 | 7.5 System messages 7.5.1 General 7.5.2 System information |
| 140 | 8 Method of encrypting an RDS-TMC service 8.1 General |
| 141 | 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 |
| 142 | 8.5 Encryption by the service provider 8.6 Use of type 8A groups for RDS-TMC encryption |
| 143 | 8.7 Encryption Administration group 8.7.1 General 8.7.2 Service identifier (SID) 8.7.3 Encryption identifier (ENCID) |
| 144 | 8.7.4 Location table number before encryption (LTNBE) 8.7.5 Test Bits 8.8 Encrypting location codes 8.8.1 General |
| 145 | 8.8.2 Test mode 8.8.3 Repetition rate |
| 146 | 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 |
| 147 | 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 |
| 148 | 8.12 Decrypting location codes |
| 149 | 8.13 Alternative encryption strategy 9 Following an RDS-TMC service 9.1 General |
| 150 | 9.2 System information repetition rates 9.3 Tuning information 9.3.1 General 9.3.2 Format of the Tuning Information |
| 152 | 9.3.3 Conditions for using tuning information |
| 153 | 9.3.4 Repetition rate 9.4 Multi-group messages 9.4.1 General |
| 154 | 9.4.2 First group |
| 155 | 9.4.3 Subsequent groups |
| 156 | 9.5 Summary of X-bit usage in RDS-TMC type 8A groups |
| 158 | Bibliography |
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