Discontinuous Reception via Different TDD Subframe Configurations
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Solution Overview
Problem
In TDD networks with carrier aggregation, overlapping TDD UL/DL subframe configurations between primary and secondary cells complicate DRX parameter definition and lead to inefficiencies in resource utilization and load balancing, causing issues with simultaneous transmission and reception, and increasing complexity for base stations.
Innovation Solution
Defining different active states for primary and secondary cells by setting unique inactivity timers and on-duration timers, and configuring the secondary cell to be inactive during overlapping subframes, allowing for discontinuous reception and avoiding simultaneous transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary and secondary cells have different TDD UL/DL subframe configurations, then the resource utilization and DL/UL ratio can be optimized, but the DRX parameter definition becomes complex and overlapping subframes occur
Solution Approach 1:
The patent segments the DRX parameter definition by cell type, introducing cell-specific DRX parameters for primary cells and secondary cells. This allows independent configuration of DRX parameters for each cell type, resolving the complexity caused by different TDD UL/DL subframe configurations while maintaining optimized resource utilization.
Solution Approach 2:
The patent introduces dynamic DRX parameter adjustment mechanisms that adapt to different TDD UL/DL subframe configurations. The DRX parameters can be dynamically configured based on the specific cell type and its TDD configuration, enabling flexible optimization of resource utilization without fixed complex parameter definitions.
2Productivity
If simultaneous transmission and reception is enabled to accommodate overlapping subframes, then all subframes can be utilized, but the mobile terminal requires a duplex filter which increases complexity
Solution Approach 1:
The patent extracts the conflicting overlapping subframes from simultaneous transmission and reception operations. By identifying and excluding overlapping subframes from concurrent operations, the system achieves subframe utilization without requiring complex duplex filters, reducing mobile terminal complexity while maintaining efficient resource usage.
Solution Approach 2:
The patent performs preliminary identification and configuration of non-overlapping subframes before transmission and reception operations. By pre-configuring the schedule to avoid overlapping subframes for simultaneous operations, the system eliminates the need for duplex filters while ensuring full utilization of available subframes through careful planning.
3Device complexity
If overlapping subframes are blocked to avoid simultaneous transmission and reception, then complexity is reduced, but some subframes cannot be utilized
Solution Approach 1:
The patent implements dynamic subframe configuration that adapts to different cell types and their TDD UL/DL subframe configurations. By dynamically assigning subframes to primary or secondary cells based on their specific configurations, the system minimizes blocking of subframes while maintaining reduced complexity in TDD implementation.
Solution Approach 2:
The patent applies different quality requirements and configuration rules to different subframes based on their specific characteristics and cell associations. Subframes are locally optimized for their specific cell type and configuration, allowing maximum utilization without requiring uniform complex handling across all subframes, thus reducing overall TDD implementation complexity.
4Device complexity
If common DRX parameters are used for primary and secondary cells, then the DRX pattern is simplified, but the active time may not align with the TDD UL/DL subframe configurations
Solution Approach 1:
The patent segments DRX parameters into cell-specific configurations for primary and secondary cells. This segmentation allows each cell type to have DRX parameters that align with its specific TDD UL/DL subframe configuration, ensuring reliable active time alignment while maintaining manageable complexity through structured parameter organization.
Solution Approach 2:
The patent introduces dynamic DRX parameter adjustment that adapts to the specific TDD UL/DL subframe configurations of primary and secondary cells. The DRX parameters are dynamically configured to match the active time requirements of each cell type, ensuring reliable alignment without requiring overly complex static patterns.
Data Source
AI summary
Methods and apparatus are disclosed that facilitate discontinuous reception via a primary cell and one or more secondary cells that have different TDD UL/DL subframe configurations including overlapping subframes, such as in an instance in which a UL subframe of a secondary cell overlaps with a corresponding DL subframe of the primary cell. A method may define an active state of a primary cell to be larger than an active state of a secondary cell in a TDD network that supports carrier aggregation. The method may also provide for discontinuous reception via the primary cell and the secondary cell in accordance with different TDD UL/DL subframe configurations and also in accordance with the respective active states of the primary and secondary cells.