Cross-Carrier DCI Scheduling via Search Space Segmentation
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Solution Overview
Problem
The current 5G NR technology lacks specific specifications for applying downlink control information (DCI) for cross-carrier scheduling when carrier aggregation (CA) is employed, which is necessary for efficient resource allocation across multiple cells.
Innovation Solution
A method for receiving downlink control information (DCI) involves determining a set of candidate numbers and aggregation levels for receiving a first DCI configured for scheduling Physical Downlink Shared Channels (PDSCHs) across multiple cells, and then receiving the DCI based on these determinations on a first cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is employed to aggregate multiple carriers for wider band transmission, then bandwidth flexibility and system throughput are improved, but the complexity of resource allocation and control information management increases
Solution Approach 1:
The patent segments the control information management by introducing separate search space sets for different cells. Each search space set is independently configured with specific aggregation levels and candidate numbers, allowing the UE to separately monitor and decode DCI for each cell without being overwhelmed by the complexity of managing all cells simultaneously. This segmentation resolves the contradiction by maintaining high throughput through CA while reducing control management complexity through structured organization.
Solution Approach 2:
The patent introduces a new dimension of organization by defining search space sets with specific identities (search space set IDs) that map to particular cells. This dimensional organization allows the system to handle multiple carriers efficiently by adding a layer of abstraction (search space configuration) between the physical carriers and the UE's processing, thereby managing complexity while preserving throughput benefits.
2Productivity
If cross-carrier scheduling is implemented to schedule PDSCHs on multiple cells, then bandwidth utilization is improved, but the difficulty of detecting and measuring DCI parameters increases
Solution Approach 1:
The patent applies local quality by configuring different search space parameters (aggregation levels, candidate numbers) specifically for each cell's search space set. Instead of using uniform parameters across all cells, the system tailors the detection parameters to each cell's characteristics and scheduling requirements. This allows efficient bandwidth utilization through cross-carrier scheduling while simplifying DCI detection by providing cell-specific optimized parameters.
Solution Approach 2:
The patent implements preliminary action by pre-configuring search space sets with specific aggregation levels and candidate numbers before actual DCI transmission. The network configures multiple search space sets with different parameters in advance, and the UE prepares corresponding detection configurations. This preliminary setup reduces the real-time detection complexity when cross-carrier scheduling DCI needs to be decoded, as the UE already has prepared detection parameters for each cell.
3Adaptability or versatility
If multiple search space sets with different aggregation levels are configured for DCI reception, then scheduling flexibility is improved, but the device complexity for managing multiple configurations increases
Solution Approach 1:
The patent achieves universality by creating a standardized search space set configuration framework that can be applied across multiple cells and carriers. The search space set structure (with ID, aggregation levels, candidate numbers) serves as a universal template that works for different cells, different carriers, and different scheduling scenarios. This multi-functional configuration system provides scheduling flexibility while avoiding the need for completely separate management mechanisms for each cell, thereby reducing overall device complexity.
Data Source
AI summary
An aspect of the disclosure includes a method for, including: determining a first set of candidate number of a first set of aggregation level (AL) for receiving a first DCI; and receiving the first DCI according to the first set of candidate number and the first set of AL on a first cell, wherein the first DCI is configured for scheduling PDSCHs on a plurality of cells, and the plurality of cells comprises a second cell and a third cell, and the first set of candidate number and the first set of AL are corresponding to a search space with a first identity.