Single DCI Multi-Cell Scheduling via Segmented Bitfields
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently scheduling multiple cells with a single DCI, as this approach can result in a large DCI size, increasing control channel overhead and potentially requiring more control channel elements and a higher aggregation level to maintain reliability.
Innovation Solution
The proposed solution involves configuring a wireless transmit/receive unit (WTRU) to receive a single DCI that schedules multiple cells, where the WTRU determines the target cells based on various indicators such as radio network temporary identifiers (RNTIs), DCI formats, and bitfields, allowing for dynamic scheduling and power control across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single DCI is used to schedule multiple cells, then control channel overhead is reduced, but DCI size increases which may require more control channel elements and higher aggregation level
Solution Approach 1:
The DCI is segmented into different fields with selective multiplication based on cell configuration. Not all bitfields are multiplied by the number of scheduled cells - only those necessary for cells with specific configurations (e.g., only MCS bitfield for cells with dynamic MCS). This segmentation approach reduces the effective DCI size while maintaining multi-cell scheduling capability.
Solution Approach 2:
Different parts of the DCI have different multiplication factors based on local cell characteristics. The DCI structure applies local quality by making bitfield multiplication cell-dependent rather than uniform - cells with certain configurations (e.g., configured with dynamic MCS) get full bitfield multiplication, while cells with fixed configurations do not, optimizing the overall DCI size.
2Loss of information
If all bitfields are multiplied by the number of scheduled cells, then complete scheduling information is provided for all cells, but DCI size becomes excessively large
Solution Approach 1:
Instead of multiplying all bitfields by the number of scheduled cells (excessive action), the invention applies partial multiplication only to necessary bitfields. This partial action approach ensures scheduling information completeness for cells that need it while avoiding unnecessary bits for cells with fixed configurations, thereby reducing overall DCI size.
Solution Approach 2:
The invention changes the parameter of bitfield multiplication from a fixed approach (multiply all fields by number of cells) to a conditional approach where multiplication factors vary based on cell configuration parameters. This parameter change allows the DCI to adapt its size based on actual scheduling needs rather than using a worst-case approach.
Data Source
AI summary
The disclosure pertains to methods and apparatus for enabling single DCI scheduling of multiple cells. A method implemented in a wireless transmit/receive unit (WTRU), includes receiving, by the WTRU, a single downlink control information (DCI). The method additionally includes determining, by the WTRU, scheduling of multiple cells based on the single DCI. The method also includes performing wireless communications, by the WTRU, based on the determination.