Overview
ISO/TS 20026:2017 - "Intelligent transport systems - Cooperative ITS - Test architecture" - specifies an extension to the ETSI C‑ITS conformance test architecture. It defines how to use the ITS station‑internal management communications protocol (IICP, ISO 24102‑4) to connect an ITS test system to an Implementation Under Test (IUT) inside a System Under Test (SUT). The technical specification enables remote access to Points of Control and Observation (PCOs) of the IUT for protocol and application conformance testing in ITS station units.
Key topics and technical requirements
- IICP-based test architectures: Defines both a simple IICP test architecture (single physical link) and an architecture with a test Communication Interface (test CI) used when access‑layer testing is required.
- Test system links and roles: Describes the logical links between ITS test system and SUT - lower layers link, upper tester transport link, and configuration/notification link - and how these can be implemented on a single physical medium (e.g., Ethernet).
- IUT locations: Covers testing of IUTs located in ITS station layers: access layer, networking & transport layer, facilities layer, management entity, and security entity.
- IICP function groups: Uses IICP for (a) simulation of communication SAPs, (b) remote access to management SAPs (MA/MF/MN/MI/MS‑SAP), and (c) general remote commands and observations.
- Dispatcher behaviour: Specifies the role of the test dispatcher which detects ITS‑SCU identifiers (including test CI id = 4) and establishes appropriate links and configuration for testing.
- Message types & formats: References formats such as unaligned PER and specific ports (e.g., PORT_IIC = 32764 per ISO 24102‑4), and port types like utPort, ltPort, cnPort, plus IICP management messages.
- Conformance test artifacts: Includes normative annexes for IICP conformance testing and binary presentation of test messages.
Applications and who uses this standard
ISO/TS 20026 is intended for organizations involved in C‑ITS conformance testing and deployment:
- Test laboratories and certification bodies performing protocol and application conformance testing for ITS station units.
- Vehicle OEMs and roadside equipment vendors implementing ITS‑S communication components who need to validate implementations against standardized behavior.
- Test tool and test CI (golden device) vendors creating tools that implement IICP interfaces and convert access‑layer streams for test setups.
- Standards engineers and integrators who design ITS station architectures and testing strategies, including TTCN‑3 based test suites.
Practical benefits include simplified test system integration, reduced development of IUT‑specific test harnesses (IICP provides remote access to PCOs), and cost‑efficient conformance testing using standard ITS station management interfaces.
Related standards
- ISO 24102‑4 (IICP - ITS station internal management communications)
- ISO 24102‑3 (MX‑SAP service primitives)
- ISO 21217 (ITS station and communication architecture / CALM)
- ETSI C‑ITS test framework and TTCN‑3 testing recommendations
Keywords: Intelligent transport systems, Cooperative ITS, C‑ITS, IICP, conformance testing, ITS station, IUT, SUT, test architecture, ITS‑SCU.