Wireless Communication Node DCI Segmentation for Multi-Cell CSI Reporting
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Solution Overview
Problem
The existing CSI reporting triggering scheme in NR systems is no longer applicable when one DCI schedules PUSCHs/PDSCHs of multiple cells, leading to inefficiencies and increased hardware complexity.
Innovation Solution
A unified design scheme is proposed for CSI reporting that includes a first DCI with multiple sub-fields for scheduling and determining cells, reducing signaling overhead and optimizing transmission reliability by implicitly determining the cell for CSI set transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one DCI schedules PUSCHs/PDSCHs of multiple cells, then scheduling efficiency is improved, but the existing CSI reporting triggering scheme becomes inapplicable leading to increased device complexity
Solution Approach 1:
The DCI is segmented into multiple independent fields: a first field for triggering CSI reporting and a second field for determining the target cell. This segmentation allows the CSI triggering function to be separated from the cell scheduling function, enabling the existing CSI reporting mechanism to work independently while supporting multi-cell scheduling, thus improving scheduling efficiency without increasing device complexity
Solution Approach 2:
The DCI structure is designed with multi-functionality by incorporating fields that can serve multiple purposes: the first field triggers CSI reporting applicable to any cell, while the second field determines which cell the CSI applies to. This universal design allows a single DCI to handle both single-cell and multi-cell scenarios, maintaining compatibility with existing CSI reporting schemes while enabling advanced multi-cell operations
2Reliability
If separate DCIs are used for each cell scheduling, then CSI reporting scheme remains applicable, but signaling overhead increases
Solution Approach 1:
Multiple cell scheduling information is merged into a single DCI by combining the first field (CSI triggering) and second field (cell determination). This merging reduces the number of separate DCIs needed, thereby reducing signaling overhead while maintaining CSI reporting compatibility through the preserved first field structure
Solution Approach 2:
The second field acts as an intermediary that links the CSI triggering in the first field to the specific cell. This intermediary mechanism allows the DCI to efficiently schedule multiple cells without requiring separate DCIs for each cell, reducing signaling overhead while ensuring the CSI reporting scheme remains applicable through the mediating cell determination
Data Source
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AI summary
The present application discloses a method and device used in a wireless communication node. The method comprises: a first node receives a first message set and first DCI; executes measurement on a first RS resource group; and sends first CSI on a PUSCH of a first cell. The first message set comprises a first message. The first DCI comprises a first field and a second field. The first DCI is used for scheduling PUSCHs on at least K cells, and K is a positive integer greater than 1. The first cell is one of the K cells. The first field of the first DCI is used for triggering the first CSI. The second field of the first DCI is used for determining the first cell. The measurement executed on the first RS resource group is used for calculating the first CSI. The first message is used to indicate the first RS resource group. According to the method, flexibility is increased, signaling overhead is reduced, and the reliability of CSI transmission is optimized.