SNPN to PLMN Service Continuity via Temporary Leave

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Solution Overview

Problem

Existing systems face challenges in ensuring seamless service continuity between standalone non-public networks (SNPN) and public land mobile networks (PLMN), particularly in maintaining connectivity during transitions and minimizing service interruptions due to mobility or coverage losses.

Innovation Solution

A wireless transmit/receive unit (WTRU) and network mechanisms are implemented to trigger a temporary leave from an SNPN to establish a pre-configured backup user plane connection in a PLMN, using priority search modes and configuration information to manage connections and ensure service continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a WTRU maintains continuous connection to SNPN, then service reliability is improved, but mobility flexibility deteriorates

Engineering Contradiction:

Improveservice continuityVSAvoidmobility flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system pre-establishes backup user plane connections in PLMN networks before they are needed. When a WTRU temporarily leaves an SNPN, the backup connection is already ready to provide immediate service continuity, eliminating the need to maintain continuous SNPN connections for all mobility scenarios.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The PLMN network acts as an intermediary backup connection when the primary SNPN connection is temporarily unavailable. The system establishes a secondary user plane connection through PLMN that can take over service provision when the WTRU is temporarily outside SNPN coverage, thus mediating between the need for reliable service and mobility flexibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If backup connections are pre-established in PLMN, then service continuity is improved, but network complexity increases

Engineering Contradiction:

Improveservice continuityVSAvoidconnection management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements self-service mechanisms where the network automatically manages the establishment and maintenance of backup connections based on pre-configured parameters. The WTRU and network autonomously handle the complexity of managing multiple connections without requiring complex user intervention or manual configuration, thus reducing the perceived complexity while maintaining service continuity.

Inventive Principle:

Principle #25Self-service

3Reliability

If WTRU temporarily leaves SNPN to establish backup connection, then service continuity is improved, but connection establishment time increases

Engineering Contradiction:

Improveservice continuityVSAvoidconnection setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by pre-establishing backup user plane connections in PLMN networks before temporary leave events occur. This advance preparation ensures that when a WTRU needs to temporarily leave an SNPN, the backup connection is already in place and can immediately take over, thus maintaining service continuity while minimizing the time loss associated with connection establishment.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230189191A1Enabling service continuity between standalone non-public network and plmn

Publication Date: 2023.06.15 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Systems and methods are described herein for enabling service continuity between standalone non-public network (SNPN) and a public land mobile network (PLMN). A wireless transmit/receive unit (WTRU) may enable service continuity, for example, by triggering a temporary leave of the WTRU from a serving SNPN to prepare a pre-established backup user plane (UP) connection in a PLMN. A network may enable service continuity, for example, by triggering a temporary leave of a WTRU from a serving SNPN to prepare a pre-established backup UP connection in a PLMN. A WTRU may switch back to SNPN from PLMN, for example, using an SNPN priority search mode and/or other WTRU behavior(s).