ISO/IEC 15429:2003 PDF

Overview

ISO/IEC 15429:2003 specifies the signalling protocol used at the Q reference point (QSIG/PSS1) to support two Wireless Terminal Mobility functions in a Private Integrated Services Network (PISN): the Wireless Terminal Location Registration supplementary service (SS‑WTLR) and the Wireless Terminal Information exchange additional network feature (ANF‑WTINFO). This stage‑3 international standard defines message formats, state machines, operational requirements and protocol interactions required for Private Integrated services Network eXchanges (PINXs) that interconnect to form a PISN.

Key topics and technical requirements

• Scope & conformance
  • Stage‑3 signalling protocol for SS‑WTLR and ANF‑WTINFO at the Q reference point.
  • Conformance demonstrated using the Protocol Implementation Conformance Statement (PICS) proforma (Annex A).
• Operational roles
  • Requirements and actions for Visitor PINX, Home PINX, Transit PINX and Directory PINX during registration, deregistration and information transfer.
• Procedures and state definitions
  • Detailed signalling procedures for location registration, location deregistration, transfer of restriction information, and location checks.
  • State machines for visitor/home/directory PINXs and timers (T1–T6) governing protocol behavior.
• Coding and transport
  • Message structures, information elements and ASN.1 definitions (Annex B & E).
  • Examples of message sequences and SDL representations (Annexes C & D).
• Protocol interactions
  • Defined interactions with many supplementary services and ANFs (e.g., call forwarding, message waiting indication, authentication, call transfer, call offer) to ensure correct multi‑service behaviour.
• Interworking
  • Considerations for interworking with public ISDNs and non‑ISDN networks.

Applications and who uses this standard

• Telecom equipment vendors building PINX/PISN systems and QSIG/PSS1‑compatible PBX interconnects.
• Network architects and operators deploying corporate private networks that support wireless terminal mobility (allowing a wireless terminal to register and receive services across different access points).
• Protocol implementers and firmware developers responsible for message encoding (ASN.1), state machines and timer handling.
• Test labs and certification bodies using the PICS proforma and example sequences for interoperability testing.
• Standards and compliance teams validating interactions between supplementary services in multi‑vendor PISNs.

Related standards

• ISO/IEC 11579‑1 (PINX reference configuration), ISO/IEC 11582 (generic supplementary service protocol), ISO/IEC 15428 (stage‑1/2 WTM service definitions), plus relevant ITU‑T recommendations (e.g., I.130, Q.950).

Keywords: ISO/IEC 15429:2003, SS‑WTLR, ANF‑WTINFO, Wireless Terminal Location Registration, PISN, PINX, Q reference point, QSIG, PSS1, ASN.1, PICS.