Wireless Device CCA Adaptation for Unlicensed Paging Reliability

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Solution Overview

Problem

Wireless communication devices face challenges in operating efficiently on unlicensed carriers using power saving techniques like eDRX, particularly due to unpredictable interactions and issues with clear channel assessment (CCA) leading to failed measurements and paging misses.

Innovation Solution

Implementing a method where wireless devices and network nodes adapt their operations based on clear channel assessment (CCA) parameters, adjusting parameters such as Paging Time Window (PTW) and DRX cycles to accommodate CCA failures, ensuring reliable measurements and paging reception even in unlicensed frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If eDRX is used for power saving on unlicensed carriers, then energy consumption is reduced, but measurement opportunities become insufficient and paging reliability deteriorates

Engineering Contradiction:

Improveenergy consumptionVSAvoidpaging reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent dynamically adjusts the paging time window (PTW) duration based on CCA failure statistics. When CCA failures are detected, the PTW is extended to provide additional measurement opportunities, thereby maintaining paging reliability while preserving eDRX power-saving benefits. This dynamic adaptation resolves the contradiction between energy saving and reliable operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the PTW parameter adaptively based on channel conditions and CCA failure rates. By modifying this key parameter, the system ensures sufficient measurement opportunities are available even when using extended DRX cycles for power saving, thus maintaining reliability without sacrificing energy efficiency.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If CCA procedures are performed on unlicensed carriers, then channel access is achieved, but measurement opportunities are reduced and mobility performance deteriorates

Engineering Contradiction:

Improvechannel accessVSAvoidmobility performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent performs measurements during the extended paging time window before mobility decisions are made. By conducting measurements in advance during the PTW period, the system ensures that mobility performance is not degraded by CCA procedures, while still maintaining the ability to access unlicensed carriers when needed.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If DRX cycles are extended for power saving, then energy consumption is reduced, but measurement opportunities become insufficient

Engineering Contradiction:

Improveenergy consumptionVSAvoidmeasurement opportunities

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The system dynamically extends the paging time window duration based on the DRX cycle configuration and CCA failure statistics. This dynamic adjustment ensures that even with extended DRX cycles for power saving, sufficient measurement opportunities are provided within the PTW period, resolving the contradiction between energy saving and measurement availability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250024492A1Communication on unlicensed frequency bands

Publication Date: 2025.01.16 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is disclosed a method of operating a wireless device in a wireless communication network, the wireless device being adapted for operating based on a clear channel assessment, CCA, on at least one carrier and/or cell for which an eDRX cycle is configured. The method includes performing one or more radio procedures based on one or more CCA parameters. The disclosure also pertains to related devices and methods.