ISO/IEC 15428:1999 PDF

Overview

ISO/IEC 15428:1999 specifies the Wireless Terminal Location Registration (SS‑WTLR) supplementary service and the Wireless Terminal Information Exchange (ANF‑WTINFO) additional network feature for Private Integrated Services Networks (PISN). The standard provides stage 1 (service as seen by users) and stage 2 (functional model and information flows) specifications that enable wireless terminal mobility (WTM) inside a PISN: location registration, de‑registration, temporary identity assignment, and exchange of WTM information between the Home Data Base (HDB) and Visitor Data Base (VDB).

Key topics and requirements

• Service definition (SS‑WTLR): Procedures for location registration and de‑registration so users can maintain or suspend call services when moving between location areas.
• Additional network feature (ANF‑WTINFO): Mechanisms for exchanging WTLR user information between HDB and VDB to support roaming within a PISN.
• Temporary identities (NAI): Use of Network Assigned Identities to identify users temporarily and support secure re‑registration.
• Authentication: Optional authentication procedures may be used to validate a WTM user before completing location registration.
• Functional model & information flows (stage 2): Identification of functional entities (e.g., PINX, HDB, VDB, fixed parts), message flows, functional entity actions, and allocation to physical equipment.
• Behavioral specification: Overall Specification and Description Language (SDL) models and interworking considerations are included.
• Conformance: To claim conformance, a stage 3 standard (signalling protocols and equipment behaviour) must implement the requirements described in stages 1 and 2.

Applications and practical value

• Enables call routing and service continuity for wireless terminals in enterprise PBX / PISN environments.
• Supports on‑site roaming in campuses, factories, hotels, and large office complexes where wireless handsets access PISN services from multiple access points.
• Allows temporary de‑registration (e.g., device powered off or out of coverage) to prevent missed or misrouted calls.
• Facilitates secure visitor handling by exchanging subscriber state and service profiles between Home PINX and Visitor PINX via ANF‑WTINFO.
• Useful for designers of PISN exchanges, wireless fixed parts, and system integrators implementing mobility and location services.

Who should use this standard

• Telecom equipment vendors and PBX/PISN manufacturers
• Network architects and system integrators for enterprise wireless telephony
• Standards and interoperability engineers implementing signalling and database synchronisation
• Security architects managing authentication for mobile terminal registration

Related standards

• ISO/IEC 11574 (PISN basic services)
• ISO/IEC 11571 (Numbering and sub‑addressing)
• ISO/IEC 11579‑1 (PISN reference configuration)
• ISO/IEC 15432 (Wireless Terminal Authentication)
• ITU‑T I.130, I.210 and Z.100 (service characterization and SDL)

Keywords: ISO/IEC 15428:1999, SS‑WTLR, ANF‑WTINFO, PISN, Wireless Terminal Location Registration, Network Assigned Identity, HDB, VDB, WTM.