PLMN Change Method for Seamless Roaming During Service Disruptions
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Solution Overview
Problem
There is a lack of technical methods for seamlessly switching a user equipment (UE) from one Public Land Mobile Network (PLMN) to another during a service disruption, such as a disaster, without causing service interruptions or application terminations.
Innovation Solution
A method for UE roaming in a second PLMN to change access to a first PLMN, involving receiving a message with information to deregister from the second PLMN, performing the deregistration, selecting the first PLMN, and performing a registration procedure with the first PLMN.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE performs traditional PLMN switching during service disruption, then UE can access alternative network, but service interruption and application termination occur
Solution Approach 1:
The network performs preliminary actions by establishing a warning mechanism that notifies UEs of upcoming PLMN changes before they occur. The AMF sends warning messages to UEs indicating that a PLMN change will happen, allowing UEs to prepare and maintain their service connections during the transition, thereby preventing service interruption and application termination.
2Reliability
If UE switches to second PLMN during disaster, then communication service is maintained, but seamless switching capability is lacking
Solution Approach 1:
The system implements feedback mechanisms where the network continuously monitors PLMN status and provides warning messages to UEs about upcoming changes. This feedback loop allows UEs to understand network conditions and switch PLMNs smoothly without experiencing service disruptions, as they receive advance notice and can prepare for the transition.
Solution Approach 2:
The network performs preliminary actions by notifying UEs of upcoming PLMN changes through warning messages before the actual switch occurs. This preliminary notification enables UEs to prepare for the transition, ensuring seamless switching to the second PLMN while maintaining communication service availability.
3Adaptability or versatility
If traditional deregistration procedure is performed, then UE disconnects from second PLMN, but service interruption occurs during transition
Solution Approach 1:
The invention maintains continuity of useful action by implementing a warning mechanism that allows UEs to maintain their service connections during the PLMN transition process. Instead of immediately disconnecting and reconnecting, UEs receive advance warning and can smoothly transition while keeping their services active, thereby reducing transition time and avoiding service interruptions.
Data Source
AI summary
One disclosure of the present specification provides a method for a terminal roaming in a second Public Land Mobile Network (PLMN) to change the connection to a first PLMN to which the terminal is subscribed. The method may include a step for the first PLMN to receive a first message including first information from a base station in the second PLMN. The method may include a step for inspecting whether a procedure for deregistering from the second PLMN is required. The method may include a step for performing the procedure for deregistering from the second PLMN on the basis of the inspection result. The method may include a step for selecting the first PLMN. The method may include a step for performing a procedure for registering to the first PLMN.