DRX Timer Counting in TDD-FDD Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In carrier aggregation systems, existing methods fail to efficiently count the Discontinuous Reception (DRX) timer, particularly in TDD-FDD joint operation, where PDCCH subframes are not adequately defined for FDD serving cells, leading to inefficiencies in power management and data transmission.
Innovation Solution
A method where the User Equipment (UE) counts DRX timers by configuring time related to DRX operation, specifically counting uplink subframes for all TDD serving cells and not configuring scheduling cell identifiers for FDD serving cells, allowing efficient DRX timer management in TDD-FDD joint operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing DRX timer counting methods are used in carrier aggregation systems, then the system can operate with multiple cells, but the DRX timer cannot be efficiently counted in TDD-FDD joint operation
Solution Approach 1:
The patent segments the DRX timer counting mechanism by cell type (TDD vs FDD). For TDD serving cells, the timer is counted in non-uplink subframes, while for FDD serving cells, it is counted in all subframes. This segmentation allows each cell type to be handled according to its specific characteristics, resolving the inefficiency in TDD-FDD joint operation.
Solution Approach 2:
The patent applies different counting rules to different types of serving cells based on their local characteristics. TDD cells use one counting method (excluding uplink subframes) while FDD cells use another (counting all subframes). This local quality approach ensures that each cell type is managed optimally within the carrier aggregation system.
2Ease of operation
If PDCCH subframes are counted for all serving cells uniformly, then the counting method is simple, but it leads to power management inefficiencies and data transmission delays
Solution Approach 1:
The patent introduces dynamic adaptability to the DRX timer counting mechanism by making the counting rule dependent on the cell type and subframe configuration. The system dynamically adjusts which subframes are counted based on whether the cell is TDD or FDD and whether the subframe is an uplink subframe, optimizing power consumption without sacrificing operational simplicity.
3Measurement precision
If scheduling cell identifiers are configured for all serving cells, then cell identification is complete, but FDD serving cells create inefficiencies in DRX timer management
Solution Approach 1:
The patent extracts the scheduling cell identifier configuration requirement specifically for FDD serving cells, treating them differently from TDD cells. By recognizing that FDD cells do not need scheduling cell identifiers for proper DRX timer management, the system removes an unnecessary constraint and improves overall data transmission efficiency.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for counting a DRX (Discontinuous Reception) timer in a carrier aggregation system, the method comprising: configuring a plurality of cells including at least one FDD (Frequency Division Duplex) serving cell and at least one TDD (Time Division Duplex) serving cell; and counting a DRX timer in a subframe, wherein the subframe is an uplink subframe for all TDD serving cells.