AMF LADN Availability Determination for 5G UE Mobility
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in efficiently managing local area data network (LADN) connectivity, including determining available LADNs, establishing PDU sessions, and handling changes in user equipment (UE) location, which affects service quality and resource allocation.
Innovation Solution
The system introduces methods for an access and mobility management function (AMF) to determine available LADNs based on UE subscriptions, send location information to UEs, and manage PDU sessions by notifying a session management function (SMF) when a UE moves out of an LADN's area of availability, allowing for session adjustments such as suspension or release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system provides comprehensive LADN availability information to UEs, then service quality and connectivity reliability are improved, but network signaling overhead and processing complexity increase
Solution Approach 1:
The network performs preliminary determination of LADN availability information based on UE subscription data before the UE actually needs to access the LADN. The AMF proactively identifies which LADNs are available to each UE and sends this information in advance during mobility management procedures, so that when the UE needs to connect, the connectivity can be established immediately without additional signaling overhead.
Solution Approach 2:
The system enables UEs to self-determine their own LADN availability by providing them with the necessary subscription information and availability criteria. The UE can autonomously assess whether it is within an LADN service area and initiate appropriate PDU session establishment or release actions without requiring continuous network intervention, thereby reducing network processing complexity.
2Reliability
If the system continuously monitors UE location for LADN availability, then service quality is maintained, but network energy consumption and processing load increase
Solution Approach 1:
Instead of continuous monitoring, the system implements periodic location checks triggered by specific events such as UE mobility management procedures, handovers, or periodic registration updates. The AMF determines LADN availability information at these discrete intervals based on the UE's current location and service area information, maintaining service quality while significantly reducing the energy consumption and processing load associated with continuous monitoring.
Solution Approach 2:
The system establishes a feedback mechanism where the UE reports its location information to the network at defined intervals or upon entering/exiting service areas, and the network responds by updating LADN availability information only when changes are detected. This event-driven feedback approach ensures service quality is maintained through timely updates while avoiding the energy waste of continuous monitoring when no changes occur.
3Duration of action of stationary object
If PDU sessions are maintained when UE moves out of LADN area, then connectivity continuity is improved, but network resource allocation efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts PDU session states based on real-time LADN availability information. When the UE moves into or out of LADN service areas, the network automatically modifies the PDU session configuration - establishing sessions when LADN becomes available and releasing or suspending them when LADN is no longer available. This dynamic adaptation ensures connectivity continuity is maintained only when appropriate, optimizing resource allocation efficiency by releasing resources when LADN services are unavailable.
4Adaptability or versatility
If the system sends detailed LADN information to UEs, then UE can make informed connection decisions, but signaling overhead and information transmission complexity increase
Solution Approach 1:
The system extracts and sends only the essential LADN availability information that UEs need to make connection decisions, rather than transmitting complete detailed configurations. The AMF identifies and communicates key parameters such as LADN identifiers, service area information, and availability status, omitting redundant or non-essential details. This extraction approach enables UEs to make informed connection decisions while minimizing signaling overhead and information transmission complexity.
Data Source
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AI summary
Certain aspects of the present disclosure relate to methods and apparatus relating to local area data network connectivity. In certain aspects, a method for use by a network device includes determining a set of available local area data networks (LADNs) for a user equipment (UE) based on a subscription of the UE to a set of data network names (DNNs) corresponding to the set of available LADNs and sending the UE information indicative of the set of available LADNs and a location of availability corresponding to each of the LADNs of the set of available LADNs.