Disaster Roaming PLMN Selection Failure List
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Solution Overview
Problem
In wireless communication systems, particularly during disaster roaming, user equipment (UE) experiences repetitive PLMN selection loops due to authentication failures, leading to network overload and extended service disruptions.
Innovation Solution
Implementing a disaster roaming failure list and using an implementation-specific timer, along with a new 5G system mobility management cause value, to manage UE registration attempts and reduce repetitive loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE continuously attempts PLMN selection during disaster roaming, then service availability is improved, but network load increases and causes overload
Solution Approach 1:
The patent implements periodic action by introducing a timer mechanism that controls UE to attempt PLMN selection only at specific intervals rather than continuously. The timer prevents repetitive authentication attempts during a defined period, reducing network load while maintaining periodic service availability checks.
Solution Approach 2:
The patent applies feedback by monitoring authentication failure causes and using this information to control subsequent PLMN selection behavior. When authentication failures are detected, the system feeds back this information to adjust the PLMN selection process, preventing repeated attempts that would cause network overload.
2Stability of the object's composition
If UE performs repetitive PLMN selection loops, then service continuity is maintained, but service disruption time increases
Solution Approach 1:
The patent implements preliminary action by checking authentication failure causes before initiating PLMN selection loops. By preliminarily assessing whether authentication failures are due to disaster conditions, the system可以避免 unnecessary repetitive loops that would extend service disruption time while maintaining service continuity through alternative paths.
Solution Approach 2:
The patent applies dynamics by making PLMN selection behavior adaptive based on authentication failure conditions. The system dynamically adjusts its behavior - entering selective loops only when appropriate - rather than following a fixed repetitive pattern, thereby reducing service disruption time while maintaining continuity.
3Ease of operation
If UE selects any available PLMN during disaster conditions, then connectivity is restored, but authentication failures increase
Solution Approach 1:
The patent applies feedback by monitoring authentication outcomes and using this information to guide subsequent PLMN selection. When authentication failures occur, the system feeds back this information to adjust selection criteria, avoiding repeated failures while maintaining ease of connectivity restoration.
Solution Approach 2:
The patent implements parameter changes by modifying PLMN selection parameters based on authentication failure causes. When disasters are detected, the system changes selection parameters to favor PLMNs less likely to fail authentication, thereby improving success rate while maintaining ease of connectivity restoration.
Data Source
AI summary
Systems and methods are provided for public land mobile network (PLMN) selection for disaster roaming. A user equipment (UE) determines a disaster condition at a first PLMN, where the UE is a subscriber of the first PLMN. The UE determines an availability of a second PLMN for disaster roaming. The UE selects the second PLMN and attempts registration on the second PLMN for disaster roaming. In response to attempting the registration on the second PLMN for disaster roaming, the UE receives a registration reject message including a cause value corresponding to a registration failure for disaster roaming on the second PLMN due to the disaster condition on the first PLMN. The UE waits for a first period of time before again attempting to register for disaster roaming on the second PLMN for the first PLMN with the disaster condition.