TDD Inter-Band Carrier Aggregation DRX Timer Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing inter-band carrier aggregation in Time Division Duplex (TDD) mode, particularly in defining consecutive Physical Downlink Control Channel (PDCCH) subframes for discontinuous reception (DRX) timers, which can lead to reduced scheduling opportunities due to the consideration of deactivated Secondary Serving Cells' configurations.
Innovation Solution
The method involves connecting User Equipment (UE) with a Primary Serving Cell and configuring at least one Secondary Serving Cell, where the TDD uplink-downlink configurations of the Primary and Secondary Cells can differ. The method defines consecutive PDCCH subframes for DRX timers based on the activated serving cells' configurations, excluding deactivated cells, ensuring proper scheduling opportunities by considering only the activated cells' TDD UL-DL configurations for drx-InactivityTimer and drx-RetransmissionTimer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the TDD UL-DL configuration of deactivated SCells is considered for defining consecutive PDCCH subframes, then the DRX timer definition becomes more comprehensive, but the scheduling opportunities are reduced
Solution Approach 1:
The patent extracts the TDD UL-DL configuration consideration from deactivated SCells, removing them from the calculation of consecutive PDCCH subframes for DRX timers. This extraction resolves the contradiction by ensuring that only activated cells contribute to DRX timer definition, thereby maintaining scheduling opportunities while preserving comprehensive DRX timer definition for active carriers.
Solution Approach 2:
The patent applies local quality by differentiating the treatment of activated versus deactivated SCells. Activated cells are included in the consecutive PDCCH subframe calculation, while deactivated cells are excluded. This localized differentiation ensures that DRX timer definition reflects only the actual active scheduling opportunities, resolving the contradiction between comprehensiveness and scheduling efficiency.
2Area of stationary object
If all configured cells are considered for PDCCH monitoring, then the coverage is maximized, but the scheduling efficiency is reduced
Solution Approach 1:
The patent introduces dynamic consideration based on cell activation status. The set of cells considered for PDCCH monitoring and DRX timer definition is dynamically adjusted according to whether cells are activated or deactivated. This dynamic approach resolves the contradiction by adapting the monitoring scope to actual operational needs, maximizing coverage for active cells while maintaining scheduling efficiency.
Data Source
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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.