Terminal Device CSI Report Management for Uplink Control Channel
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Solution Overview
Problem
Existing radio communication systems face challenges in efficiently managing channel state information (CSI) reports across multiple serving cells, particularly when the number of reports exceeds a certain threshold, leading to collisions and reduced communication efficiency.
Innovation Solution
A terminal device is designed to receive and transmit CSI reports across multiple serving cells, with a mechanism to prioritize and drop reports when the total number exceeds a certain limit, ensuring efficient communication by updating only a specified number of reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal device transmits all CSI reports for multiple serving cells, then the channel state information coverage is improved, but the uplink control channel capacity is exceeded causing collisions
Solution Approach 1:
The patent segments the uplink control channel into multiple independent PUCCH resources, each dedicated to specific serving cells. This segmentation allows the terminal to transmit CSI reports for different cell groups separately, preventing channel capacity overflow while ensuring complete CSI coverage across all serving cells.
Solution Approach 2:
The patent introduces a new dimension for CSI report management by configuring multiple PUCCH resources with different resource identifiers (RI). Instead of competing for a single channel resource, CSI reports are distributed across multiple dimensional resources (different PUCCH formats, different time-frequency resources), resolving the capacity conflict.
2Reliability
If the terminal device updates all CSI reports in every subframe, then the channel state information freshness is improved, but the processing overhead and power consumption increase
Solution Approach 1:
The patent implements periodic CSI reporting mechanisms where terminals update CSI reports at configured intervals rather than every subframe. Different serving cells can have different reporting periodicities, allowing the system to maintain CSI freshness for critical cells while reducing update frequency for less dynamic cells, thereby optimizing power consumption.
Solution Approach 2:
The patent enables dynamic adjustment of CSI reporting behavior based on channel conditions and traffic patterns. The terminal can adaptively select which CSI reports to update in each subframe based on priority configurations and current channel state, maintaining reliability while reducing unnecessary processing and power consumption during stable conditions.
Data Source
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Figure 3A~3C
AI summary
A terminal device configured to report CSI using multiple uplink cells. In a case that a total of the number of one or multiple first channel state information reports and multiple second channel state information reports in a first subframe exceeds a first certain number, a second certain number of channel state information reports of the one or multiple first channel state information reports and the multiple second channel state information reports are not updated. The second certain number is a number obtained by subtracting the first certain number from the total of the number of the one or multiple first channel state information reports and the number of the multiple second channel state information reports.