UE Disaster Roaming Timer Recovery After Power Cycling
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Solution Overview
Problem
Existing methods for managing disaster conditions in user equipment (UE) in wireless networks result in unnecessary delays and inefficiencies due to the handling of disaster roaming wait timers, particularly when the UE switches off and on or when the universal subscriber identity module (USIM) is removed and re-inserted, leading to improper management of disaster roaming services.
Innovation Solution
The proposed solution involves managing disaster conditions by initiating and restarting timers for disaster roaming and return wait ranges based on elapsed time and remaining timer values, ensuring timely selection of public land mobile networks (PLMNs) for disaster roaming services, even after power cycles or USIM changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE initiates a disaster roaming wait timer and switches off before the timer expires, then the timer state is lost, but restarting the timer after switch-on causes unnecessary service delays
Solution Approach 1:
The UE stores the remaining timer value in non-volatile memory before switching off, so that upon switch-on, the timer can be immediately restarted from the stored value rather than starting a new full-duration timer. This preliminary storage action prevents service delays while maintaining reliability.
Solution Approach 2:
The system implements feedback by checking whether the stored remaining timer value is greater than the elapsed time since switch-off. Based on this feedback comparison, the UE determines whether to restart the timer or allow immediate service activation, thereby optimizing the balance between reliability and time loss.
2Ease of operation
If the UE always restarts the disaster roaming wait timer after switch-on, then service activation is delayed, but not restarting may cause improper timer management
Solution Approach 1:
The timer management system transitions from a static always-restart approach to a dynamic conditional approach. The UE dynamically evaluates the relationship between the stored remaining timer value and the elapsed time since switch-off, and adjusts its behavior accordingly - either restarting the timer or allowing immediate service activation.
Solution Approach 2:
The system changes the timer parameter state based on conditional evaluation. When the stored remaining value exceeds the elapsed time, the timer parameter is reset and restarted; otherwise, the timer parameter is cleared to allow immediate service activation, optimizing both operational simplicity and time efficiency.
3Reliability
If the UE removes and re-inserts the USIM while the timer is running, then the timer state is lost, but improper handling causes service interruptions
Solution Approach 1:
The UE stores the remaining timer value in non-volatile memory before USIM removal, ensuring that the timer state is preserved. Upon USIM re-insertion, the system retrieves the stored value and restarts the timer, preventing service interruptions that would occur with a full timer reset.
Solution Approach 2:
The system prepares for the USIM removal event by storing the timer state in advance. This beforehand cushioning ensures that even though the USIM is removed, the timer information is preserved and can be restored, cushioning against the potential service interruption that would otherwise occur.
4Productivity
If the UE immediately attempts registration after switch-on, then service activation is fast, but timer management becomes improper and causes network congestion
Solution Approach 1:
The UE performs a preliminary check after switch-on to determine whether the stored remaining timer value has elapsed. Based on this preliminary evaluation, the UE either waits for the timer to expire before registration or proceeds with immediate registration, thereby maintaining both fast activation speed and proper service management reliability.
Solution Approach 2:
The system changes the registration parameter state based on timer evaluation. When the stored remaining value indicates the timer has elapsed, the registration parameter is activated immediately; otherwise, the system maintains the waiting state, optimizing both productivity and reliability.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Embodiments disclose methods for managing a condition in a UE. The method includes initiating a timer for disaster wait range; in case that the UE is switched off while the timer is running, and that the UE is switched on after the UE is switched off, wherein a universal subscriber identity module (USIM) in the UE remains as same, and the UE selects a public land mobile network (PLMN) for a disaster roaming: identifying a first time remaining for the timer for timeout at switch off, identifying a second time related to a time between switching off and switching on, and determining whether to restart the timer based on the first time and the second time.