UE Tracking Loop Updates for DRX Rude Wake-Up Power Control

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Solution Overview

Problem

In wireless communication systems, user equipment (UE) operating in discontinuous reception (DRX) mode faces inefficiencies due to the need for tracking loop updates during rude wake-up events, which can be optimized to reduce power consumption and improve performance.

Innovation Solution

The UE selectively performs tracking loop updates based on a threshold time difference between the last tracking loop update and the warm-up occasion, adapting the tracking loop updates to minimize power consumption during rude wake-up events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tracking loop updates are performed during every rude wake-up event, then communication reliability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the parameter of tracking loop update frequency based on the time difference condition. When the time difference between last update and warm-up occasion exceeds a threshold, tracking loops are updated; otherwise, they are skipped. This dynamic parameter adjustment resolves the contradiction by adapting update frequency to actual needs, maintaining reliability when necessary while reducing power consumption when recent updates suffice.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If tracking loop updates are skipped during rude wake-up events, then power consumption is reduced, but communication performance deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements a feedback mechanism by monitoring the time difference between the last tracking loop update and the current warm-up occasion. This feedback information determines whether to perform or skip the tracking loop update, ensuring that updates occur when performance would deteriorate while skipping them when power savings are acceptable, thus resolving the contradiction dynamically.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If tracking loop updates are performed frequently, then time synchronization accuracy is improved, but processing time increases

Engineering Contradiction:

Improvetime synchronization accuracyVSAvoidprocessing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies partial action by performing tracking loop updates only when the time difference exceeds a threshold, rather than updating at every opportunity. This selective approach provides sufficient time synchronization accuracy for normal operation while avoiding excessive updates that would consume unnecessary processing time, thus resolving the contradiction between precision and time loss.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12532259B2Adaptive tracking loop updates in user equipment

Publication Date: 2026.01.20 QUALCOMM INC

AI summary

A wireless communication device can adaptively perform tracking loop updates for rude wake-up events when operating in a discontinuous reception (DRX) mode. In an aspect, the wireless communication device can perform one or more tracking loop updates, such as time tracking loop (TTL) updates and frequency tracking loop (FTL) updates, based on a time difference between a last tracking loop update and a warm-up occasion associated with a rude wake-up event being greater than a threshold. In addition, in response to the time difference being less than or equal to the threshold, the wireless communication device can perform the rude wake-up event without performing the one or more tracking loop updates.