ISO 21219-5:2019

Overview

ISO 21219-5:2019 - TPEG2 Service Framework (TPEG2‑SFW) specifies the service framework for Traffic and Travel Information delivered using the Transport Protocol Experts Group Generation 2 (TPEG2). The standard defines how a multiplex of TPEG Services and Service Components is structured and signalled so that traffic, travel and related data can be efficiently transmitted over potentially unreliable broadcast channels (and equally over point‑to‑point or multicast/IP transport). ISO 21219‑5:2019 replaces earlier TPEG1/TPEG documents (TPEG‑INV and TPEG‑SSF) and ties the UML modelling approach to the two physical representations: TPEG‑binary and tpegML.

Key topics and technical requirements

• Service multiplexing and structure
  • Definition of a TPEG Service (multiplex of Service Components) and TPEG Service Component (virtual channel for a specific TPEG application).
  • Rules for the TPEG Stream Directory to signal services present in a stream or file.
• Layered model
  • Description of Transport, Service, and Service Component levels and how they interact.
• Modelling and physical representations
  • UML‑based modelling rules for TPEG2 and conversion rules to:
    • TPEG‑binary (annex A - normative) and
    • tpegML (annex B - normative).
• Operational attributes and administration
  • Service Identification (SID) administration procedures (annex C - normative).
  • CRC calculation rules for integrity checking (annex D - normative).
• Design principles
  • Efficient point‑to‑multi‑point delivery over byte‑oriented channels; easy encapsulation in IP; backward compatibility considerations with TPEG1.
• Normative references and terminology
  • Terms/definitions for TPEG roles (Server, Client), frames, streams and structures; references to related TPEG parts.

Applications and who uses it

ISO 21219‑5:2019 is intended for organizations and professionals implementing traffic and travel information systems:

• Broadcast service operators (DAB/DVB) delivering TTI over broadcast channels.
• Traffic and travel data providers and aggregators designing multiplexed TPEG services.
• Navigation system and OEM suppliers integrating TPEG2 decoders and filter logic.
• Software developers producing TPEG‑aware servers, clients and middleware (binary and XML/tpegML tools).
• ITS integrators and public transport authorities using TPEG2 for dynamic content (real‑time incidents, parking, PTI) and static content. Practical use cases include broadcast traffic bulletins, multicast updates to fleet vehicles, encapsulation in IP for internet delivery, and hybrid broadcast/broadband TTI services.

Related standards

• ISO 21219 series (TPEG2 toolkit, transport and application parts), e.g. ISO 21219‑2/3/4 (UML and conversion rules), ISO 21219‑6 (message management), ISO/TS 21219‑7 (location referencing).
• Legacy reference: ISO/TS 18234‑3 (TPEG1 SNI).

Keywords: ISO 21219-5:2019, TPEG2, TPEG2‑SFW, Traffic and Travel Information, intelligent transport systems, tpegML, TPEG binary, service framework.