Terminal Device CSI Reporting for Multiple Uplink Cells

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Solution Overview

Problem

Existing radio communication systems face challenges in efficiently communicating between base station devices and terminal devices, particularly in managing multiple serving cells and coordinating Channel State Information (CSI) reports.

Innovation Solution

The proposed solution involves a terminal device and a base station device that utilize advanced PUCCH (Physical Uplink Control Channel) formats and CSI reporting mechanisms to efficiently manage multiple serving cells. This includes configuring PUCCH cell groups, prioritizing CSI reports, and using specific PUCCH formats to handle collisions and optimize resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple serving cells are configured for carrier aggregation, then system capacity and throughput are improved, but device complexity and resource management difficulty increase

Engineering Contradiction:

Improvesystem capacityVSAvoidresource management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the management of multiple serving cells by introducing the concept of PUCCH cell groups, where cells are divided into different groups based on their PUCCH configuration. This segmentation allows independent management of control channel resources for different cell groups, reducing the overall complexity of resource management while maintaining support for multiple serving cells through carrier aggregation

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple CSI reports are transmitted simultaneously, then channel state information accuracy is improved, but uplink resource consumption and collision probability increase

Engineering Contradiction:

Improvechannel state information accuracyVSAvoiduplink resource consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic CSI reporting mechanisms where terminal devices transmit channel state information at configured intervals rather than continuously or simultaneously for all cells. This periodic action allows the system to maintain accurate channel state information while reducing peak uplink resource consumption and avoiding collisions by spacing out reporting instances across different time resources

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent segments CSI reporting by configuring different terminal devices to report CSI for different cell groups at different times. By dividing the set of serving cells into multiple PUCCH cell groups and assigning different reporting schedules to each group, the system maintains comprehensive channel state information accuracy while distributing uplink resource usage over time, preventing resource exhaustion and collisions

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3334204B1Terminal device, base station device, communication method, and integrated circuit

Publication Date: 2025.06.04 SHARP KK

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AI summary

A terminal device is configured to report CSI using multiple uplink cells, a total of the number of first channel state information reports and the number of second channel state information reports in a first subframe does not exceed a certain number, and a total of the number of the first channel state information reports in a second subframe and the number of the second channel state information reports in a third subframe exceeds the certain number.