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.
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