Terminal Device PUCCH Format Adaptation for CSI Collision Avoidance
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Solution Overview
Problem
In LTE radio communication systems, existing technologies face challenges in efficiently managing channel state information (CSI) reports across multiple serving cells, particularly when collisions occur between CSI reports from different cells, which can lead to communication inefficiencies.
Innovation Solution
A terminal device and base station device configuration that allows for the reporting of CSI using multiple formats on physical uplink control channels, where CSI for some processes is reported in a first format and for others in a second format, and in cases of collision, the reports are adapted to use a second format on the same channel to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple CSI reports are transmitted on the same PUCCH using the same format, then the device complexity is reduced, but collision between reports from different serving cells occurs leading to reliability degradation
Solution Approach 1:
The patent segments the PUCCH resource allocation by introducing different PUCCH formats (first format and second format) for transmitting CSI reports from different serving cells. This segmentation prevents collision between reports by assigning distinct transmission formats to different cell reports, thereby maintaining reliability without significantly increasing device complexity.
Solution Approach 2:
The patent implements dynamic PUCCH format selection based on the serving cell configuration. The terminal device dynamically determines whether to use the first format or second format for transmitting CSI reports based on which serving cells are configured, allowing flexible adaptation to different network configurations while avoiding collisions.
2Ease of operation
If a single PUCCH format is used for all CSI reports, then the ease of operation is improved, but communication efficiency deteriorates due to collisions between reports from multiple serving cells
Solution Approach 1:
The patent applies local quality by assigning different PUCCH formats to different serving cell reports based on their specific characteristics and configurations. Each serving cell's CSI report is transmitted using the appropriate format for that cell, optimizing the transmission efficiency for each local case while maintaining overall system performance.
Data Source
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AI summary
To efficiently report channel state information in an uplink. A terminal device includes a transmission unit which reports CSI for multiple CSI processes in a first serving cell and CSI for a second serving cell, first CSI for some of multiple CSI processes for the first serving cell being reported on a PUCCH with a first format, and second CSI for the rest of multiple CSI processes for the first serving cell being reported on a PUCCH with the first format, and if 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.