DRX Timer Configuration for Inter-Band Carrier Aggregation in TDD
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Solution Overview
Problem
Current methods for inter-band carrier aggregation in TDD mode do not adequately consider the activation/deactivation status of Secondary Serving Cells (SCells) when defining DRX timers, leading to reduced scheduling opportunities for User Equipment (UE) due to incorrect inclusion of TDD UL-DL configurations of deactivated SCells.
Innovation Solution
The method involves connecting User Equipment (UE) with a Primary Serving Cell (PCell) and configuring at least one deactivated SCell, where the TDD UL-DL configurations of the PCell and SCell can differ, and only considering the TDD UL-DL configurations of activated serving cells when defining consecutive PDCCH subframes for DRX timers, excluding those of deactivated SCells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDD UL-DL configurations of deactivated SCells are included when defining DRX timers, then comprehensive cell configuration coverage is achieved, but scheduling opportunities are reduced and data throughput decreases
Solution Approach 1:
The patent extracts and excludes the TDD UL-DL configurations of deactivated SCells from the DRX timer definition process. By separating the configurations of activated and deactivated cells, the system only considers activated cell configurations when determining consecutive PDCCH subframes, thereby eliminating the negative impact of deactivated cell configurations on scheduling opportunities while maintaining configuration coverage for activated cells
Solution Approach 2:
The patent introduces dynamic adjustment of DRX timer parameters based on the activation status of SCells. The system dynamically determines which cell configurations to include in DRX timer calculations by checking the activation state of each SCell, allowing the DRX behavior to adapt to the current operational state of carrier aggregation cells and optimize scheduling efficiency
2Reliability
If TDD UL-DL configurations of all configured SCells are considered for DRX timers, then complete configuration coverage is maintained, but incorrect inclusion of deactivated cell configurations reduces data throughput
Solution Approach 1:
The patent extracts and removes the configurations of deactivated SCells from the set of configurations used for DRX timer definition. This selective extraction ensures that only activated cell configurations contribute to DRX timer calculations, preventing the incorrect inclusion that would otherwise reduce data throughput while preserving complete configuration coverage for currently active cells
Solution Approach 2:
The system dynamically adjusts the set of cell configurations considered for DRX timers based on real-time activation status. By continuously monitoring which SCells are activated and adjusting the configuration set accordingly, the system maintains accurate configuration coverage for active cells while excluding deactivated cell configurations that would harm data throughput
Data Source
AI summary
A method and apparatus are disclosed to improve inter-band carrier aggregation (CA) in a UE (User Equipment) in TDD (Time Division Duplex) mode. In one embodiment, the method includes connecting the UE with a PCell (Primary Serving Cell). The method further includes configuring the UE with at least one SCell (Secondary Serving Cell), among which at least one SCell is deactivated, wherein TDD UL-DL (Uplink-Downlink) configurations of the PCell and the at least one SCell may be different. The method also includes taking a TDD UL-DL configuration of an activated serving cell into consideration for defining consecutive PDCCH (Physical Downlink Control Channel) subframes of a drx-InactivityTimer, and not taking a TDD UL-DL configuration of a deactivated serving cell into consideration.