Overview
ISO 21219-1:2023 - "Intelligent transport systems - Traffic and travel information (TTI) via Transport Protocol Experts Group, generation 2 (TPEG2) - Part 1: Introduction, numbering and versions (TPEG2‑INV)" is the index and versioning reference for the TPEG Generation 2 toolkit. It defines the Application Identification (AID) scheme, the numbering and versioning rules for TPEG2 components and applications, and the update/maintenance policy for the TPEG2 family. This first edition (2023) upgrades the document from a Technical Specification to an International Standard and aligns TPEG2 with current UML‑based development and physical format conversion practices (binary and XML).
Key topics and technical requirements
- Application identification (AID): A unique AID is assigned to each TPEG2 application. Examples include:
- SNI (Service and Network Information) - AID 0x0000
- PKI (Parking Information) - AID 0x0003
- TEC (Traffic Event Compact) - AID 0x0005
- WEA (Weather Information) - AID 0x000A
- Test AID mechanism: Test instances are flagged by setting the most significant bit (add hex 0x8000). Client devices must ignore content flagged with a Test AID to avoid processing test streams in production.
- Versioning and updates: The document is the central index and will be revised whenever other TPEG2 specifications are updated or new applications are added. Preliminary AIDs are managed by TISA (Traveller Information Services Association).
- Definitions and structure: Includes core terms (service, service component), abbreviated terms, and the relationship between TPEG1 and TPEG2 application versions to ensure interoperability.
- No normative references: The standard functions as an index and coordination document rather than a prescriptive technical specification.
Applications and practical value
- Ensures consistent numbering and version control across the TPEG2 toolkit, which is critical for:
- Broadcasters and broadcast middleware (DAB, DVB, RDS-TMC)
- Telematics and in‑vehicle infotainment (IVI) vendors
- Navigation system integrators and mapping providers
- Traffic data service providers and content aggregators
- Enables safe testing of new TPEG applications within live multiplexes using Test AIDs without disrupting production services.
- Supports conversion workflows from UML to binary and XML physical formats, helping implementers maintain synchronized documentation and formats.
Who should use this standard
- Standards developers, system architects and implementers working with TPEG2, TTI (traffic and travel information) services, and intelligent transport systems (ITS).
- Automotive OEMs, telematics companies, broadcasters, and third‑party data providers that require consistent application identifiers and versioning for interoperable TTI services.
Related standards
- Other parts of the ISO 21219 TPEG2 series (UML, conversion rules, message management, location referencing) and legacy TPEG1 series (ISO 18234) - consult ISO 21219 series index for full cross‑references.
Keywords: ISO 21219-1, TPEG2, traffic and travel information, AID, application identification, TTI, TISA, intelligent transport systems.