UE Timer Handling for Faster 5G Service Recovery
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Solution Overview
Problem
Existing 5G mobile communication systems face challenges in efficiently managing service recovery processes, particularly in non-3GPP access scenarios, leading to delays and inefficiencies in user equipment registration and data network connectivity.
Innovation Solution
Implementing a method in user equipment (UE) to support faster service recovery by managing timers and initiating initial registration procedures based on timer events and attempt counters, specifically utilizing timers T3511 and T3502 to optimize registration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional timer management is used in 5G service recovery, then system stability is maintained, but service recovery speed is slow
Solution Approach 1:
The patent applies dynamics by making the timer management adaptive rather than static. The UE dynamically adjusts timer behavior based on whether it supports faster service recovery and the current registration state. When faster service recovery is supported and no registration is in progress, the UE can initiate new registrations upon receiving registration reject messages, rather than waiting for traditional timer expiration. This dynamic adjustment resolves the contradiction by enabling faster recovery when conditions permit while maintaining stability when registrations are ongoing.
Solution Approach 2:
The patent changes the parameter of timer expiration behavior based on the UE's capability to support faster service recovery. When this capability is supported and the UE is not currently registered, the effective timer behavior changes from waiting for timer expiration to immediately initiating re-registration upon receiving a reject message. This parameter change enables faster service recovery without compromising system stability, as the change only occurs when the UE has the capability and is not in an ongoing registration state.
2Loss of time
If faster service recovery is implemented, then registration delay is reduced, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE determine in advance whether it supports faster service recovery and check the current registration state before initiating re-registration procedures. This preliminary assessment prevents unnecessary registrations and simplifies the overall process by establishing clear decision criteria upfront. The UE prepares by knowing its capabilities and current state, which reduces the complexity of real-time decision-making during service recovery events.
Solution Approach 2:
The patent uses feedback mechanisms where the UE monitors registration reject messages and its own registration state to trigger appropriate actions. The system provides feedback about registration success or failure, and the UE uses this feedback along with its capability information to determine whether to initiate faster service recovery. This feedback-driven approach simplifies complexity by using clear, event-triggered logic rather than continuous complex timer management.
3Productivity
If traditional registration procedures are followed, then system stability is maintained, but productivity is reduced
Solution Approach 1:
The patent segments the service recovery process into distinct paths: traditional timer-based recovery and faster recovery for capable UEs. By segmenting the recovery mechanism based on UE capability and current registration state, the system can apply the appropriate method for each scenario. This segmentation maintains reliability for traditional UEs while improving productivity for capable UEs, resolving the contradiction between stability and efficiency.
Solution Approach 2:
The patent creates a universal service recovery mechanism that works for all UEs but provides enhanced functionality for those supporting faster recovery. The same basic framework handles both traditional and accelerated recovery, with the faster path activated conditionally. This multi-functionality approach maintains broad compatibility and stability while enabling improved productivity where supported, without requiring separate systems.
Data Source
AI summary
According to one embodiment, a method performed by a user equipment (UE) comprises: determining whether the UE supports a faster service recovery; if the UE supports the faster service recovery, determining whether at least one of a first timer and a second timer is running; if the first timer is running, if the UE detects a short timer event and if a counter of attempts to step the first timer is less than a maximum number short timer stop, initiating an initial registration procedure and incrementing the counter of attempts to stop the first timer; and If the second timer is running, if the UE detects a long timer event and if a counter of registration while the second timer is running is less than a maximum number long timer registration, initiating the initial registration procedure and incrementing a counter of attempts to register while the second timer is running.