MA PDU Session Handling for LADN Service Area Exit

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face issues with erroneously allocating user plane resources to user equipment (UE) that leaves a local area data network (LADN) service area while operating in a multiple access (MA) packet data unit (PDU) session, particularly when in idle mode with multiple access networks.

Innovation Solution

The system reconfigures registration areas for the first access network to match or associate with the LADN service area, ensuring that user plane resources are not allocated to UE that has left the LADN service area by establishing MA PDU sessions using a first and second access network, and implementing triggers for reporting location updates upon leaving the LADN service area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the system allows MA PDU sessions with multiple access networks, then network flexibility and connectivity are improved, but erroneous resource allocation occurs when UE leaves LADN service area

Engineering Contradiction:

Improvenetwork flexibilityVSAvoidresource allocation accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system reconfigures registration areas to match LADN service areas before UE mobility issues occur. By pre-establishing the correspondence between registration areas and LADN service areas, the network proactively prevents erroneous resource allocation while maintaining MA PDU session flexibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements location update reporting mechanisms that provide feedback when UE leaves or enters LADN service areas. This feedback loop enables the network to detect UE location changes and adjust resource allocation accordingly, preventing incorrect resource assignment while maintaining multi-access flexibility.

Inventive Principle:

Principle #23Feedback

2Reliability

If the system monitors UE location to prevent erroneous resource allocation, then resource allocation accuracy is improved, but system complexity increases

Engineering Contradiction:

Improveresource allocation accuracyVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system merges location monitoring for LADN service area detection with existing registration area management procedures. By combining these functions, the system achieves accurate resource allocation without adding separate complex monitoring infrastructure, as the same registration area configuration serves both mobility management and LADN service area identification.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4295635B1Multi-access packet data unit (ma PDU) sessions for local area data networks (LADN)

Publication Date: 2025.11.05 QUALCOMM INC

Figure 1
Figure 2
Figure 3

AI summary

A user equipment network may request a multiple access (MA) packet data unit (PDU) session for a local area data network (LADN). In this case, the network may reject the request providing an accordingly an indication, e.g. the multiple access communication session is not supported for the LADN. Further, a user equipment (UE) may be configured to trigger a UE registration update or other location information if it leaves an LADN service area while in an idle mode with one access network and a connected mode with the other access network.