5G UE Periodic Registration Delay for Non-Allowed Areas
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Solution Overview
Problem
In 5G networks, user equipment (UE) may experience a loss of synchronization with the network due to implicit detachment when periodic registration updates are not received within a specific time window, leading to scenarios where the UE assumes it is reachable for mobile terminating services but is actually unreachable, especially when camping on non-allowed areas.
Innovation Solution
The UE initiates a periodic update timer and delays the registration update procedure until it enters a 5GMM operating substate associated with camping on a cell known to be in a non-allowed area, ensuring timely registration updates are performed once coverage is regained, thereby preventing network detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs periodic registration updates immediately upon timer expiry, then the network synchronization is maintained, but the UE may attempt updates while out of coverage causing failures and potential detachment
Solution Approach 1:
The UE performs preliminary actions by checking coverage status and transitioning to appropriate 5GMM states before initiating the registration update procedure. This ensures the UE is in a suitable state for updates, preventing failures that would occur if updates were attempted immediately upon timer expiry regardless of coverage conditions.
Solution Approach 2:
The UE dynamically adjusts its behavior based on coverage status by transitioning between different 5GMM operating states (e.g., 5GMM-REGISTERED, 5GMM-PUBLIC-LAND-MOBILE-NETWORK-SEARCH). This dynamic state management allows the UE to adaptively decide when to perform updates, balancing synchronization needs with coverage requirements.
2Reliability
If the UE delays the registration update procedure until entering appropriate 5GMM state, then update failures are prevented, but the synchronization timing is delayed
Solution Approach 1:
The UE initiates the appropriate 5GMM state transition as a preliminary action before the periodic update timer expires. By starting the state transition process in advance, the UE minimizes the overall delay while ensuring it is in the correct state to perform the update when the timer does expire.
Solution Approach 2:
The UE employs periodic monitoring of its 5GMM state and coverage conditions, triggering state transitions at appropriate intervals. This periodic check mechanism ensures the UE is ready for updates without requiring excessive delay, balancing timely synchronization with reliable update execution.
3Productivity
If the network implicitly releases the UE registration context after a time window without periodic updates, then network resources are freed, but the UE may assume it remains reachable causing service availability issues
Solution Approach 1:
The UE uses feedback from its 5GMM state transitions and coverage status to determine when to perform registration updates. By continuously monitoring its state and triggering updates when appropriate (even if delayed), the UE provides feedback to the network about its actual reachability status, preventing mismatches between network assumptions and actual service availability.
Solution Approach 2:
The UE performs preliminary state transitions and update preparations before the network's implicit release timer expires. This preliminary action ensures the UE maintains its registration context actively, preventing the network from incorrectly assuming the UE is unreachable and thus maintaining service availability while still being efficient with network resources.
Data Source
AI summary
A user equipment (UE) that initiates a periodic update timer, wherein the UE is configured to perform a periodic registration update procedure in response to a periodic update timer expiry event, identifies that the periodic update timer has expired, wherein the periodic update timer expiry event occurs when the UE is out of coverage, selects a cell to camp on, wherein the cell is known to be in a non-allowed area and initiates the periodic registration update procedure in response to the periodic update timer expiry event, wherein the UE delays the periodic registration update procedure until the UE enters a fifth generation mobility management (5GMM) operating substate associated with camping on the cell that is known to be in the non-allowed area.