UE Access Stratum Activation With Timed Tracking Area Updates

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Solution Overview

Problem

Existing 3GPP wireless communication systems face challenges in efficiently managing the activation of the access stratum (AS) layer during unavailability periods, leading to inefficiencies in network connectivity and data transmission.

Innovation Solution

A method and user equipment (UE) are developed to trigger a tracking area update (TAU) procedure when an unavailability period ends and a discontinuous coverage maximum time offset timer expires, followed by activating the AS layer upon exiting the unavailability period, with additional timers and signaling adjustments to ensure seamless network reconnection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the AS layer is activated immediately upon exiting unavailability period, then network connectivity is restored faster, but network signaling overhead and potential conflicts increase

Engineering Contradiction:

Improvetime to restore network connectivityVSAvoidnetwork signaling overhead

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The UE performs a tracking area update procedure before activating the AS layer. This preliminary action ensures the network is prepared for the upcoming activation, reducing conflicts and signaling overhead when the AS layer is activated. The TAU procedure updates the network about the UE's return from unavailability period in advance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reconnection process is divided into two separate steps: first performing tracking area update, then activating the AS layer. This segmentation allows each procedure to be completed independently with proper timing, avoiding conflicts that would occur if both actions happened simultaneously or in reverse order.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If the UE performs tracking area update before AS layer activation, then network state consistency is improved, but connection establishment time increases

Engineering Contradiction:

Improvenetwork state consistencyVSAvoidconnection establishment time

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The solution uses timed periodic actions with specific timers (T3412 for periodic TAU, and a second timer for AS layer activation timing). This ensures the TAU procedure is performed at the appropriate moment before AS activation, maintaining network consistency while optimizing the timing to minimize overall connection establishment time.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12389361B1Method and user equipment for activating access stratum layer upon coming out of the unavailability period

Publication Date: 2025.08.12 MENTATS CO LTD

AI summary

According to one embodiment of this specification, there is provided an operation method of user equipment (UE). The method may comprise: triggering a tracking area update (TAU) procedure when an unavailability period has ended and a discontinuous coverage maximum time offset timer has expired; starting a first timer at completion of the tracking area update procedure if the UE has included unavailability information and has not included a start of the unavailability period in a tracking area update request message; and upon coming out of the unavailability period, activating an access stratum (AS) layer.