Multi-Access PDU Sessions for LADNs with Location-Aware Resource Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring that user plane resources are not erroneously allocated 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 using multiple access networks.
Innovation Solution
The network reconfigures registration areas to match the LADN service area, steers traffic to a single access network, and implements triggering conditions for UE to report location updates when leaving the LADN service area, thereby preventing resource allocation errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network supports MA PDU sessions for LADNs with multiple access networks, then network versatility and user connectivity are improved, but the risk of erroneous user plane resource allocation increases when UE leaves the LADN service area
Solution Approach 1:
The network performs preliminary configuration by reconfiguring the registration area of the first access network to match the LADN service area before the UE potentially leaves. This advance preparation ensures that when location updates occur, the network already has the correct registration area configuration to accurately determine whether UE is within the LADN service area, preventing erroneous resource allocation
Solution Approach 2:
The system implements a feedback mechanism where the UE reports location information or configuration updates when leaving the LADN service area. The network uses this feedback to detect UE location changes and accordingly releases user plane resources, ensuring that resource allocation accuracy is maintained through continuous monitoring and response to UE movement
2Measurement precision
If the network reconfigures registration areas to match LADN service area, then resource allocation accuracy is improved, but network control complexity increases
Solution Approach 1:
The patent merges the registration area configuration with the LADN service area definition by reconfiguring the first access network's registration area to match the LADN service area. This consolidation eliminates the need for separate, complex mappings between registration areas and LADN service areas, simplifying network configuration while maintaining precise alignment for accurate resource allocation
3Measurement precision
If the network implements triggering conditions for UE location reporting, then resource allocation accuracy is improved, but signaling overhead and UE power consumption increase
Solution Approach 1:
The system implements periodic or event-triggered location reporting where the UE reports location information only when specific triggering conditions are met (e.g., when leaving the LADN service area). This approach balances the need for accurate location tracking with energy conservation by avoiding continuous reporting, thereby reducing UE power consumption while maintaining sufficient location awareness for resource allocation accuracy
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a network may establish a multiple access (MA) packet data unit (PDU) session for a local area data network (LADN) and may reconfigure a registration area to map to a LADN service area. A network may establish an MA PDU session for an LADN, but may steer traffic to only one of two access links. A network may reject a request for an MA PDU if it is for an LADN. 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. A UE may request LADN registration, and the network may provide the UE with an indication that MA PDU sessions for the LADN are not supported.