DRX Timer Configuration for Unlicensed SCell Carrier Aggregation
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Solution Overview
Problem
In wireless communication systems, configuring a DRX timer for carrier aggregation with at least one SCell operating in an unlicensed spectrum poses challenges due to differing requirements between licensed and unlicensed bands, particularly in ensuring reliable PDCCH monitoring and power consumption.
Innovation Solution
Implementing a method where common DRX is used for both licensed and unlicensed bands but with different Active Time timer values for each, increasing PDCCH monitoring time for the unlicensed band compared to the licensed band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common DRX is used for both licensed and unlicensed bands, then device complexity is reduced, but PDCCH monitoring reliability in unlicensed band deteriorates
Solution Approach 1:
The patent applies local quality by configuring different DRX parameters specifically for unlicensed band SCells while maintaining common DRX framework. The network configures separate drx-ConfigSCell values for SCells in unlicensed bands, allowing tailored PDCCH monitoring behavior for each band type without overhauling the entire DRX system.
Solution Approach 2:
The patent changes DRX parameters (drx-ConfigSCell, onDurationTimer, drx-InactivityTimer) specifically for unlicensed band SCells to extend Active Time duration. This parameter adjustment increases PDCCH monitoring reliability in unlicensed bands while keeping the overall DRX structure intact and manageable.
2Reliability
If PDCCH monitoring time is increased for unlicensed band, then monitoring reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by extending Active Time duration specifically for unlicensed band SCells while maintaining standard DRX timing for licensed band PCell. This localized adjustment ensures enhanced monitoring only where needed (unlicensed bands with LBT uncertainty) rather than globally across all carriers, thus minimizing unnecessary power consumption.
Solution Approach 2:
The patent makes DRX behavior dynamic by adapting Active Time duration based on band type and LBT requirements. The UE dynamically adjusts monitoring duration per SCell based on drx-ConfigSCell parameters, extending monitoring only during periods when unlicensed band channel access is uncertain, rather than maintaining extended monitoring continuously.
3Reliability
If separate DRX configurations are used for licensed and unlicensed bands, then PDCCH monitoring reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a single DRX configuration structure (drx-ConfigSCell) that serves both licensed and unlicensed bands. The same DRX framework and parameter set are universally applied across all SCells, with band-specific behavior achieved through parameter values rather than separate configuration structures, reducing overall system complexity.
Solution Approach 2:
The patent merges the DRX configuration approach by integrating unlicensed band SCell DRX settings into the existing licensed band DRX framework. Instead of creating separate DRX systems, the patent combines both band types under a unified DRX configuration mechanism, sharing common timers and state machines while allowing band-specific parameter overrides.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for configuring a DRX timer in a carrier aggregation, the method comprising: configuring with a first cell group including at least one first cell and a second cell group including at least one second cell served by an e-NodeB; receiving two set of DRX timer values, receiving a PDCCH signal from the first cell or the second cell; applying one of the first set of DRX timer value or the second set of DRX timer value to the DRX timer; monitoring PDCCH signals for the first cell and the second cell while the DRX timer is running.