ISO 14819-1:2021 Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

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Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C是ISO发布的ISO标准，适用于全球。

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Intelligent transport systems — Traffic and travel information messages via traffic message coding —

Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

1 Scope

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.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 4217, Codes for the representation of currencies

IEC 62106 (all parts), Radio data system (RDS) — VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz

3 Terms, definitions and abbreviated terms

3.1 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/ 3.1.1

access profile

ACP

unique description of a particular RDS-TMC service and subscription period

3.1.2

alternative frequency

AF

frequency used by a transmitter in an immediately adjacent area that carries the same audio programme service as the tuned programme

Note 1 to entry: Several AFs are transmitted together in a list. Where the TMC service uses the same Network as an audio service, this AF list is also used for following the TMC service.

3.1.3

application identification

AID

identification that signals the specific group type used by the open data application (3.1.23)

3.1.4

continuity index field

field that helps to distinguish between different multi-group messages

Note 1 to entry: All groups within any particular multi-group message contain the same value of this continuity index.

3.1.5

country code

CC

non-zero integer transmitted as the location table country code (LTCC) (3.1.21), or if that value is zero, the programme identification country code (PICC) (3.1.27)

3.1.6

direction and extent

identifier for adjacent segments or specific point locations (3.1.17) also affected by the incident, and where appropriate the direction of traffic affected

3.1.7

diversion advice

advice showing whether end-users are recommended to find and follow an alternative route

3.1.8

duration

indication of how long the problem is expected to last

3.1.9

encryption identifier

ENCID

value indicating which line in the service key (3.1.30) table of parameters the service provider is using in the encryption process that day

Note 1 to entry: The encryption identifier is transmitted in type 8A group variant 0.

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