Terminal Device PUCCH Format Selection for CSI Collision Avoidance
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Solution Overview
Problem
In LTE communication systems, existing methods face challenges in efficiently reporting Channel State Information (CSI) across multiple serving cells, particularly when CSI reports from different cells collide, leading to interference and reduced communication efficiency.
Innovation Solution
A terminal device and base station device configuration that allows CSI reports to be transmitted on Physical Uplink Control Channels (PUCCH) using different formats, enabling efficient reporting by prioritizing and dropping reports as necessary to avoid collisions, ensuring reliable communication even when multiple CSI reports overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple CSI reports are transmitted on PUCCH using the same format, then the reporting structure is simple, but collisions occur between reports from different cells leading to interference and reduced communication efficiency
Solution Approach 1:
The patent applies local quality by assigning different PUCCH formats to different serving cells or CSI report types. Specifically, Format 2 is used for certain CSI reports while Format 3 is used for others, allowing each report to be transmitted with appropriate formatting characteristics that prevent collision interference while maintaining overall system reliability
2Loss of information
If all CSI reports are transmitted simultaneously, then complete channel state information is provided, but resource conflicts and collisions occur reducing system performance
Solution Approach 1:
The patent segments CSI reports by applying different PUCCH formats (Format 2 and Format 3) to different serving cells or report types. This segmentation allows simultaneous transmission of multiple CSI reports without resource conflicts, as each format occupies distinct resource domains, thereby preserving complete channel state information while maintaining system performance
Solution Approach 2:
Different PUCCH formats act as intermediaries that mediate between multiple CSI reports needing simultaneous transmission. By introducing format differentiation as an intermediary layer, the system can handle multiple reports without direct resource conflicts, ensuring both information completeness and system productivity
3Adaptability or versatility
If PUCCH resources are allocated for each serving cell, then CSI reporting capacity is increased, but resource management complexity and collision handling difficulty increase
Solution Approach 1:
The patent applies universality by using a standardized set of PUCCH formats (Format 2 and Format 3) that can serve multiple serving cells and different CSI report types. This multi-functional approach increases CSI reporting capacity while avoiding the need for unique resource allocations for each cell, thereby managing complexity efficiently
Data Source
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Figure 3A~3C
AI summary
To efficiently report channel state information in an uplink. A terminal device includes a transmission unit which reports CSI for multiple subframe sets in a first serving cell and CSI for a second serving cell, first CSIs for some of multiple subframe sets for the first serving cell being reported on a PUCCH with a first format, and second CSI for the rest of multiple subframe sets for the first serving cell being reported on a PUCCH with the first format, and in a case that in a certain subframe, the second CSI report collides with the CSI report in the second serving cell, the second CSI and the CSI for the second serving cell being reported on the PUCCH with a second format.