LADN Session Management via Mobility Event Detection
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Solution Overview
Problem
Current technologies lack a method for effectively processing Local Area Data Network (LADN) sessions after a user equipment (UE) leaves the area covered by the LADN, leading to resource wastage and increased signaling overheads due to unresolved sessions and repeated establishment of new sessions.
Innovation Solution
A session processing method and system where a session management functional entity subscribes to mobility events to detect when the UE leaves the LADN area, triggering the deactivation or release of the LADN session, and determines within a preset duration whether to re-establish the session upon the UE's return, optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LADN session is maintained after the UE leaves the coverage area, then the session can be quickly re-established upon return, but network resources are wasted due to long-term occupation
Solution Approach 1:
The session management functional entity performs preliminary actions by deactivating the LADN session immediately when the UE leaves the coverage area, and simultaneously starts a timer to monitor for potential return. This preliminary deactivation prevents resource waste while the timer mechanism prepares for quick re-establishment if the UE returns within the preset duration, resolving the contradiction between maintaining session readiness and avoiding resource occupation.
Solution Approach 2:
The system dynamically adjusts the session state based on UE mobility status. When the UE leaves the coverage area, the session transitions from active to deactivated state. If the UE returns within the preset timer duration, the session can be quickly reactivated. This dynamic state adjustment mechanism allows the system to balance between resource efficiency and session re-establishment speed according to real-time conditions.
2Loss of energy
If the LADN session is deactivated immediately when the UE leaves, then network resources are released, but signaling overhead increases due to repeated session establishment upon re-entry
Solution Approach 1:
The session management functional entity performs preliminary deactivation of the LADN session when the UE leaves the coverage area, releasing network resources promptly. Simultaneously, a timer is started to monitor for UE return. This preliminary action ensures resources are freed while the timer mechanism is prepared to quickly re-establish the session if needed, balancing resource release with signaling efficiency.
Solution Approach 2:
The system implements a feedback mechanism through the timer that continuously monitors whether the UE returns to the coverage area within the preset duration. If the UE returns, the session is reactivated, avoiding the need for full session establishment signaling. If the timer expires without UE return, the session remains deactivated. This feedback-driven approach minimizes signaling overhead by only re-establishing sessions when actually needed.
3Measurement precision
If the session management entity subscribes to mobility events, then it can detect UE location changes accurately, but signaling overhead increases due to event notifications
Solution Approach 1:
The session management functional entity extracts and processes only the critical mobility event information needed for LADN session management. Instead of handling all mobility event details, it focuses specifically on detecting when the UE enters or leaves the LADN coverage area. This selective extraction of essential information maintains accurate location detection while minimizing unnecessary signaling overhead.
Data Source
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Figure 3
Figure 4A
AI summary
A session processing method, an apparatus, and a system are provided, so as to process, after UE leaves an area covered by an LADN, an LADN session established before the UE leaves the area covered by the LADN. The method includes: determining, by a session management functional entity, that UE has left an area covered by an LADN; triggering, by the session management functional entity, deactivation of an LADN session, where the LADN session is a session used by the UE to perform data transmission in the area covered by the LADN; and determining, by the session management functional entity within preset duration and depending on whether the UE re-enters the area covered by the LADN, whether to release the LADN session.