High Priority UE Reattempt Timing After Congestion Rejection
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Solution Overview
Problem
Existing systems lack effective methods for high priority user equipment (UE) to handle congestion rejection in mobile communications, particularly in 3GPP and EPS networks, where network congestion causes request denials without clear procedures for reattempting procedures.
Innovation Solution
Implementing a reattempting timer and counter mechanism for high priority UEs to manage mobility management procedures, including starting a reattempting timer based on a counter, increasing the counter, and determining when to initiate mobility management based on the timer, with specific handling for congestion timers and reattempting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high priority UEs immediately retrigger mobility management procedures after congestion rejection, then service continuity is improved, but network overload increases
Solution Approach 1:
The patent implements periodic action by introducing a T3402 timer that controls when high priority UEs can retrigger mobility management procedures after congestion rejection. The timer creates a structured periodic mechanism where UEs wait for timer expiry before attempting reconnection, transforming immediate repeated attempts into controlled periodic attempts. This resolves the contradiction by maintaining service continuity through defined reattempt opportunities while preventing network overload through enforced waiting periods.
Solution Approach 2:
The patent applies dynamics by making the reattempt behavior conditional and adaptive rather than static. High priority UEs dynamically adjust their reattempt timing based on the T3402 timer state - they can retrigger procedures when the timer is not running, but must wait when it is running. This dynamic control mechanism allows the system to balance service continuity needs against network load conditions, resolving the contradiction between immediate reconnection and overload prevention.
2Stability of the object's composition
If standard congestion backoff procedures are applied to high priority UEs, then network stability is improved, but service quality for high priority UEs deteriorates
Solution Approach 1:
The patent implements local quality by creating differentiated treatment for high priority UEs versus standard UEs during congestion conditions. Standard UEs receive T3346 timer-based backoff treatment for network stability, while high priority UEs receive T3402 timer-based treatment that allows faster reattempts for maintained service quality. This local differentiation resolves the contradiction by applying appropriate quality levels to different user groups rather than uniform treatment.
Solution Approach 2:
The patent applies segmentation by dividing the UE population into standard UEs and high priority UEs with distinct congestion handling procedures. High priority UEs are segmented out from the standard backoff mechanism and placed in a separate reattempt mechanism with different timer characteristics. This segmentation resolves the contradiction by allowing network stability measures to apply to standard users while service quality measures apply to high priority users simultaneously.
3Reliability
If high priority UEs are allowed unlimited reattempts after congestion rejection, then service continuity is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using the T3402 timer as a state indicator that provides clear feedback to high priority UEs about whether reattempt is permitted. The timer's running or expired state gives unambiguous feedback on reattempt eligibility, eliminating the need for complex decision logic. This resolves the contradiction by providing simple binary feedback that guides UE behavior without requiring complex procedures.
Solution Approach 2:
The patent applies self-service by enabling high priority UEs to autonomously determine whether they can retrigger mobility management procedures based on the T3402 timer state without needing complex network coordination. The UE independently checks the timer state and decides whether to attempt reconnection, simplifying the overall procedure. This self-service mechanism resolves the contradiction by reducing procedure complexity while maintaining reliable service continuity through autonomous UE decision-making.
Data Source
AI summary
Various solutions for congestion rejection handling for high priority user equipment (UE) in mobile communications are described. The UE may receive a non-access stratum (NAS) message with a cause value indicating a congestion. The UE may perform a mobility management in an event that it is configured as a high priority apparatus. The performing of the mobility management may include starting a reattempting timer based on a reattempting counter, increasing the reattempting counter, and determining whether to initiate a mobility management procedure based on the reattempting timer.