Core Network CSG Information Update via Handover Signaling
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Solution Overview
Problem
In cellular wireless communication systems, the Core Network (CN) often fails to be notified of changes in Close Subscriber Group (CSG) information during handover processes, leading to poor user experience and economic losses due to outdated mobility management, session management, and charging strategies.
Innovation Solution
A method and system where the target access network element or the User Equipment (UE) sends CSG information to the CN after a handover, using S1, Iu, or NAS signaling messages, ensuring the CN updates its records with the latest CSG information, even when it does not participate in the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the CN does not participate in the handover process, then the handover can be completed quickly between access network elements, but the CN cannot be notified in time of CSG information changes
Solution Approach 1:
The patent applies preliminary action by having the target access network element proactively send CSG information to the CN immediately after handover completion, rather than waiting for the CN to request it. This ensures the CN receives updated CSG information without delaying the handover process, resolving the contradiction between fast handover and timely information notification.
2Reliability
If the CN is notified of CSG information changes, then accurate service management is achieved, but additional signaling messages are required
Solution Approach 1:
The patent merges the CSG information notification with existing handover completion signaling procedures. The target access network element sends CSG information using the same signaling infrastructure already established for handover, rather than creating separate dedicated notification messages. This reduces overall signaling complexity while ensuring reliable service management.
3Loss of time
If the target access network element sends CSG information to the CN, then the CN can update its records timely, but the signaling overhead increases
Solution Approach 1:
The target access network element acts as an intermediary that efficiently transmits CSG information to the CN using existing signaling pathways. By utilizing the established S1 or Iu interface infrastructure already in place for handover management, the patent minimizes additional signaling overhead while achieving timely information updates at the CN.
Data Source
AI summary
The disclosure provides a method for notifying update information to a Core Network (CN), the method includes: a target access network element sends Close Subscriber Group (CSG) information of a cell that a User Equipment (UE) currently accesses to the CN after the UE is handed over from a source access network element to the target access network element; or the UE sends the CSG information of the cell that the UE currently accesses to the CN after receiving an instruction from the target access network element. According to the technical solution of the disclosure, when the CN does not participate in the handover process, the CSG information of the cell that the UE currently accesses is notified to the CN.