Dynamic Time-to-Trigger Adjustment for Discontinuous Reception

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Solution Overview

Problem

Current discontinuous reception/transmission and packet scheduling concepts in wireless communication systems lead to unpredictable user equipment-based measurements, particularly in LTE, due to fixed Time-to-Trigger parameters that do not account for varying radio conditions, resulting in potential delays and inaccuracies in event triggering and cell reselections.

Innovation Solution

Adapting the Time-to-Trigger parameter based on the current discontinuous reception/transmission cycle to ensure accurate evaluation and event triggering, allowing for different hysteresis characteristics in continuous and discontinuous modes, and enabling the user equipment to determine its own Time-to-Trigger value based on packet schedules and reception cycles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If fixed Time-to-Trigger parameters are used in discontinuous reception mode, then power saving is achieved, but measurement accuracy and event triggering reliability deteriorate

Engineering Contradiction:

Improvepower savingVSAvoidevent triggering reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The Time-to-Trigger parameter is made dynamic by adapting it to the current discontinuous reception cycle length. Instead of using a fixed value, the parameter automatically adjusts based on the actual measurement opportunities available, ensuring reliable event triggering while maintaining power saving benefits of discontinuous reception.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the Time-to-Trigger parameter value based on the discontinuous reception cycle configuration. When the DRX cycle changes, the Time-to-Trigger parameter is recalculated to provide an appropriate evaluation period, transforming a static parameter into a context-dependent one that maintains reliability across different operational modes.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If fixed Time-to-Trigger parameters are used in discontinuous reception mode, then device complexity is reduced, but measurement precision deteriorates

Engineering Contradiction:

Improveparameter management complexityVSAvoidmeasurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The user equipment automatically determines the appropriate Time-to-Trigger parameter value based on its own discontinuous reception cycle configuration. This self-service approach eliminates the need for complex network signaling to provide different parameter values for different modes, reducing overall system complexity while maintaining measurement precision through adaptive parameter selection.

Inventive Principle:

Principle #25Self-service

3Use of energy by moving object

If discontinuous reception is used for power saving, then energy consumption is reduced, but handover timing accuracy deteriorates

Engineering Contradiction:

Improveenergy consumptionVSAvoidhandover timing accuracy

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The invention performs preliminary evaluation of measurement criteria over the Time-to-Trigger period before actually triggering the handover event. This allows the system to account for the discontinuous nature of measurements and prepare handover decisions in advance, compensating for the timing uncertainties introduced by discontinuous reception cycles.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8145135B2Apparatus, method and computer program product providing automatically adjusted time periods used for event evaluation

Publication Date: 2012.03.27 NOKIA TECHNOLOGIES OY

AI summary

A method includes determining a first time period during which evaluation should be performed of whether a received radio frequency signal meets at least one criterion, the first time period based at least partially on a second time period of discontinuous reception or transmission. The method also includes performing the evaluation of the received radio frequency signal using measurements obtained within the first time period, and determining, based on the evaluation, whether an event should be triggered. The method further includes triggering the event in response to a determination that the event should be triggered.