ISO 21219-7:2024

Overview

ISO 21219-7:2024 - Intelligent transport systems - Traffic and travel information (TTI) via transport protocol experts group, generation 2 (TPEG2) - Part 7: Location referencing container (TPEG2-LRC) - defines the method for signalling which location referencing scheme is used by TPEG2 applications that deliver detailed location information to client devices. The standard specifies the TPEG2-Location Referencing Container (TPEG2-LRC), enabling TPEG2 messages to indicate internal and external location referencing methods in a consistent, extensible way.

Key topics and technical requirements

• Purpose: Provide a common container that signals the specific location referencing method in use for any TPEG2 message that requires precise location data.
• Toolkit constraints: Rules for application identification, version number signalling and extendibility to ensure interoperable deployment across TPEG2 applications.
• LRC toolkit structure: A modular structure that groups components used to identify and reference location methods.
• Toolkit components (examples): Definitions for the LocationReferencingContainer and Method elements plus multiple LocationReferenceLink types, including:
  • DLR1LocationReferenceLink, TMCLocationReferenceLink
  • GeographicLocationReferenceLink, UniversalLocationReferenceLink
  • OpenLRLocationReferenceLink, NDSLocationReference, and extensions for regional methods (e.g., VICS, Korean node links)
• Physical formats: Binary and XML physical representations are specified (see Annex A - binary representation, Annex B - tpegML/XML representation).
• Interoperability: Ability to handle location referencing methods external to ISO 21219 as well as internal methods defined in the series.

Practical applications and users

• Who uses it:
  • ITS service providers and broadcasters encoding traffic and travel data
  • Navigation system and in-vehicle infotainment (IVI) vendors decoding TPEG2 messages
  • Telematics and fleet management suppliers integrating route and event information
  • Map data providers, OEMs and app developers that need consistent location signalling
• Use cases:
  • Delivering precise event locations (incidents, roadworks, parking) to end-user devices
  • Enabling map-based presentation and navigation by signalling which location reference format to apply
  • Supporting mixed deployments where different location referencing methods (e.g., OpenLR, geographic or pre-coded/dynamic references) coexist

Related standards

• ISO 21219 series (TPEG2 toolkit and applications)
• ISO 17572-2 / ISO 17572-3 (pre-coded and dynamic location references)
• ISO 21219-1, -9, -14, -15 and other TPEG2 parts referenced for application and message management

Keywords: ISO 21219-7:2024, TPEG2-LRC, TPEG2, location referencing, traffic and travel information, TTI, OpenLR, geographic location referencing, dynamic location reference.