Cross-Carrier DCI Sizing Using Reference BWPs for Dormant Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of cross carrier scheduling in new radio communication systems, accurately determining the DCI format for scheduling data transmission across multiple cells, particularly when some cells are in an inactive or dormancy mode, is challenging due to the ambiguity in setting BWP IDs and specific indicator fields, leading to inaccurate scheduling.
Innovation Solution
A method for determining the DCI format by considering the bandwidth part (BWP) of the cell, specifically adjusting the quantity of information bits based on the BWP ID when a cell is in an inactive or dormancy mode, ensuring accurate alignment and monitoring of the DCI format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one piece of DCI is used to schedule data transmission of multiple scheduled cells, then scheduling efficiency is improved, but determining the DCI format becomes ambiguous when cells are in inactive or dormancy modes
Solution Approach 1:
The patent changes the parameter used for DCI format determination from the current cell's active BWP configuration to a reference BWP configuration that remains valid even when the cell is in inactive or dormancy mode. This parameter change allows the DCI format to be accurately determined regardless of the cell's operational state, resolving the ambiguity while maintaining multi-cell scheduling efficiency.
Solution Approach 2:
The patent establishes a reference BWP configuration in advance that can be used for DCI format determination before the cell actually enters inactive or dormancy mode. This preliminary setup ensures that the DCI format can be correctly identified even when the cell is not actively transmitting, preventing scheduling failures.
2Device complexity
If BWP ID is not configured for cells in inactive or dormancy modes according to existing protocol, then protocol complexity is reduced, but specific indicator fields cannot be accurately determined
Solution Approach 1:
The patent introduces a reference BWP configuration as an intermediary that mediates between the DCI format determination and the cell's actual BWP configuration. This intermediary allows the system to determine specific indicator fields accurately without requiring the cell to have an active BWP configuration, thus maintaining protocol simplicity while achieving accurate scheduling.
3Quantity of substance
If CIF does not indicate all cell combinations to reduce overhead, then signaling overhead is reduced, but accurate scheduling of all cell states cannot be achieved
Solution Approach 1:
The patent changes the determination basis of specific indicator fields from the cell's current operational state (which may be inactive or dormant) to a reference BWP configuration that is always available. This parameter change ensures that all cell combinations can be accurately scheduled without increasing CIF overhead, as the reference configuration provides the necessary information regardless of cell state.
Data Source
AI summary
This application provides example downlink control information (DCI) transmission methods and apparatuses. One example method includes receiving first cross carrier scheduling configuration information, wherein the first cross carrier scheduling configuration information indicates a terminal device to monitor a first downlink control information (DCI) format, and where the first DCI format can be used to schedule data transmission of two or more cells. When a first cell is in an inactive mode or a dormancy mode, a quantity of information bits of the first DCI format are determined based on a first bandwidth part (BWP) of the first cell. The first DCI format is then monitored based on the determined quantity of information bits of the first DCI format.