CSI Report Configuration for Sub-band Size Adaptation
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the reporting of channel state information (CSI) becomes voluminous due to multiple antenna configurations and codebooks, leading to increased energy consumption and delay, as devices struggle to transmit all CSI within the limited report size and resources.
Innovation Solution
The implementation of a CSI report configuration that adapts sub-band sizes based on codebook size and priority, allowing devices to selectively report CSI within a predetermined size limit, thereby reducing the number of sub-bands and conserving resources by increasing sub-band sizes for lower priority codebooks and dropping measurements to fit within the report size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If devices report CSI for all sub-bands and codebooks, then measurement precision is improved, but use of energy increases and reporting delay increases
Solution Approach 1:
The patent segments the CSI reporting by dividing sub-bands into different priority groups (first priority and second priority codebooks). This segmentation allows the device to selectively report CSI for high-priority sub-bands while reducing or omitting reports for lower-priority sub-bands, thereby reducing energy consumption while maintaining essential measurement precision for critical frequency regions.
Solution Approach 2:
The patent applies local quality by differentiating reporting quality across different sub-bands. High-priority codebooks associated with specific sub-bands receive full reporting attention with precise CSI measurements, while other sub-bands receive reduced reporting. This ensures that measurement precision is maintained where most needed (local optimization) rather than uniformly across all sub-bands.
2Measurement precision
If devices report CSI for all sub-bands and codebooks, then measurement precision is improved, but reporting delay increases
Solution Approach 1:
The patent segments the CSI reporting workload by prioritizing certain codebooks over others. By dividing codebooks into first priority and second priority groups, the device can complete and transmit reports for high-priority sub-bands faster, reducing overall reporting delay while maintaining sufficient measurement precision for the most critical frequency regions.
Solution Approach 2:
The patent applies partial action by reporting CSI for only a subset of sub-bands (those associated with first priority codebooks) rather than all sub-bands. This partial reporting approach reduces the time required to process and transmit CSI data, thereby reducing reporting delay, while still providing sufficient measurement precision for the most important frequency regions.
3Measurement precision
If devices increase report size to include all CSI, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the CSI report structure into priority-based groups, organizing codebooks into first priority and second priority categories. This segmentation simplifies the reporting process by providing clear rules for selection, reducing the complexity of determining what to report while maintaining measurement precision for high-priority sub-bands.
Solution Approach 2:
The patent changes the reporting parameters dynamically based on priority assignments. By adjusting which codebooks are reported (first priority vs. second priority) and modifying the report content accordingly, the system maintains measurement precision where needed while reducing overall report size and complexity through parameter-based control.
4Use of energy by moving object
If devices selectively report only high priority CSI, then energy consumption is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent ensures that measurement precision is maintained locally for high-priority sub-bands while allowing reduced precision for lower-priority sub-bands. By associating first priority codebooks with specific sub-bands and ensuring full reporting for these, the system preserves measurement precision where most critical for system performance while reducing energy consumption overall.
Data Source
AI summary
Aspects described herein relate to receiving a channel state information (CSI) report configuration indicating a plurality of codebooks and a plurality of sub-bands associated with the plurality of codebooks, the CSI report configuration associated with a CSI report size limit, and transmit, based on the CSI report configuration, a CSI report within the CSI report size limit, the CSI report including CSI for at least a portion of the plurality of sub-bands associated with the plurality of codebooks. Other aspects relate to transmitting the CSI report configuration and receiving the CSI report.