ISO 17515-2:2020

Overview

ISO 17515-2:2020 - Intelligent transport systems: E-UTRAN - Part 2 (Device to device communications, D2D) specifies the ITS‑Station (ITS‑S) access layer for the communication interface called ITS‑LTE‑D2D. It adapts and complements 3GPP Release 13 LTE‑D2D (E‑UTRAN SideLink / PC5) technology so it can be used as an ITS access technology for the dissemination of ITS information between vehicle, roadside and personal ITS‑Station Units (ITS‑SUs). The standard defines how LTE device‑to‑device (D2D) (SideLink / PC5) operation is integrated into the ITS protocol stack, including the Communication Adaptation Layer (CAL) and the Management Adaptation Entity (MAE).

Key topics and technical requirements

• Scope and applicability
  • Use of LTE D2D (PC5 / SideLink) within ITS environments (Cooperative ITS, Urban ITS).
  • Operation both with and without LTE base station support (in‑coverage and out‑of‑coverage).
• Protocol stack and interfaces
  • Definition of ITS‑LTE‑D2D Communication Interface (CI) layers: physical, data‑link, CAL.
  • Data link addressing, LCIDs, and identification of higher‑layer protocols.
• Management and adaptation
  • MAE specifications for CI management, LTE‑D2D parameters and I‑Parameters.
  • MI‑COMMANDs, MI‑REQUESTs and management service access points per ISO 24102.
• Procedures and behaviour
  • Transmit/receive procedures, CI connection and state management, cross‑CI prioritization.
  • Security and service access point requirements aligned to ISO 21218.
• Conformance & testability
  • Conformance statements, test methods, normative annexes with CI parameters, ASN.1 definitions, MI messages and state transition guidance.

Practical applications and intended users

• Applications
  • Localized ITS message dissemination (V2V, V2I, V2P) using LTE D2D for cooperative driving, traffic management, safety messaging and urban mobility services.
  • Hybrid communications architectures where LTE D2D complements cellular or ITS‑G5 links.
• Who uses this standard
  • Vehicle OEMs, telematics and ECU integrators implementing ITS‑SUs.
  • Roadside unit and personal ITS device manufacturers.
  • Telecom vendors implementing 3GPP LTE‑D2D for ITS use cases.
  • System architects, ITS deployers, certification bodies and test laboratories validating ITS‑LTE‑D2D interoperability.

Related standards (select)

• ISO 21217 - ITS station architecture
• ISO 24102‑3 - ITS station management: Service access points
• 3GPP TS 36.300, TS 23.303, TS 24.334 - LTE / ProSe (Release 13)
• ISO/IEC 8825‑2 - ASN.1 PER encoding

ISO 17515‑2:2020 enables consistent, interoperable use of LTE‑D2D (E‑UTRAN) as an ITS access technology by referencing 3GPP specifications and specifying ITS‑specific CAL/MAE adaptations, parameters and testable behaviours.