DCI Size Alignment Across Multiple Scheduling Cells
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Solution Overview
Problem
In wireless communication systems with multiple scheduling cells, there is a need to align the DCI size across different cells to adhere to a predetermined maximum number of DCI formats, especially when one cell is deactivated or has a dormant bandwidth part, while ensuring compliance with the '3+1' DCI size budget rule.
Innovation Solution
A method and apparatus for determining and aligning DCI sizes by appending padding bits to the fields of DCI formats on both the primary and secondary cells, based on a reference downlink bandwidth part, to ensure consistent DCI sizes across cells, even when one cell is deactivated or has a dormant bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If DCI size alignment is performed by appending padding bits to fields of DCI formats on multiple scheduling cells, then consistent DCI format sizes are achieved across cells, but the complexity of DCI format management increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-arranging the padding bit configurations for DCI formats before actual scheduling operations. The method determines the required padding bits in advance based on reference DCI format sizes and configures the fields accordingly, so that when DCI formats are transmitted on different scheduling cells, the size alignment is already in place without requiring real-time adjustments or complex runtime management.
2Reliability
If padding bits are appended to DCI fields to align sizes across deactivated and active cells, then compliance with the '3+1' DCI size budget rule is achieved, but the amount of data processing increases
Solution Approach 1:
The patent performs the padding bit calculation and field configuration in advance, during the setup or initialization phase. By determining the exact number of padding bits needed and pre-configuring the DCI format fields, the system avoids performing complex data processing during critical timing windows, thus maintaining compliance with the '3+1' DCI size budget rule while minimizing processing time delays.
Solution Approach 2:
The patent changes the parameter of DCI field sizes by selectively appending padding bits to specific fields based on the reference DCI format size and the actual DCI format size. This parameter adjustment ensures that all DCI formats across different cells and states (active/deactivated) conform to the standardized size budget requirements, enabling reliable processing without excessive data handling complexity.
Data Source
AI summary
Downlink control information (DCI) size alignment for a scheduled cell with multiple scheduling cells. A includes receiving: first information for first fields of a first DCI format when on a primary cell (PCell) and second information for second fields of the first DCI format when on a secondary cell (SCell). The method further includes determining: a first size for the first DCI format on the PCell, a second size for the first DCI format on the SCell, and a first number of padding bits equal to an absolute difference between the first size and the second size. When the SCell is deactivated, the second size is determined based on a first reference downlink (DL) bandwidth part (BWP) for the SCell. The method further includes receiving the first DCI format in a physical downlink control channel (PDCCH) reception on the PCell or the SCell.