Multi-Carrier CSI Reporting Rules for PUCCH Collision Handling

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Solution Overview

Problem

Existing technologies lack efficient mechanisms for periodic channel state information (CSI) signaling in multiple component carriers, particularly in LTE-Advanced systems, leading to high overhead and limited uplink capacity due to large CSI reports, and there is a need for standardized methods to handle collisions and prioritize CSI reporting configurations.

Innovation Solution

Implementing rules and procedures for handling multiple CSI reporting configurations, including options for multiplexing, prioritization based on periodicity, rank indicators, and priority assignment to primary and secondary component carriers, to manage collisions and reduce signaling burden.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If periodic CSI reporting is implemented for multiple component carriers, then channel state information coverage is improved, but signaling overhead increases and uplink capacity is limited

Engineering Contradiction:

ImproveCSI coverageVSAvoidsignaling overhead

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent segments CSI reporting by introducing different reporting modes (e.g., wideband CSI, subband CSI) and configurations for different component carriers. This allows selective reporting of CSI for specific carriers and frequency ranges, reducing overall signaling overhead while maintaining comprehensive channel state coverage across multiple carriers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic CSI reporting where the reporting configuration (periodicity, frequency granularity, carrier selection) can be adjusted based on channel conditions, traffic requirements, and system load. This dynamic adaptation optimizes the balance between CSI coverage and signaling overhead in real-time.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple CSI reporting configurations are supported, then adaptability to different carriers is improved, but device complexity increases

Engineering Contradiction:

Improvecarrier adaptabilityVSAvoidreporting configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent designs a universal CSI reporting framework that can handle multiple component carriers with different configurations using a common set of reporting modes and procedures. The same basic reporting mechanism is adapted to different carriers through configuration parameters rather than requiring separate specialized mechanisms for each carrier type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent allows the system to configure more CSI reporting instances than simultaneously active, with mechanisms to prioritize and drop less critical reports when resources are constrained. This provides adaptability for future carriers or changing conditions without requiring all configurations to be simultaneously manageable.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250280319A1Reporting channel state information in a multiple component carrier network

Publication Date: 2025.09.04 NOKIA SOLUTIONS & NETWORKS OY

AI summary

A user equipment (UE) may determine channel state information (CSI) reports with each CSI report being related to a component carrier. The UE may send a subframe with CSI report(s) on a physical uplink control channel (PUCCH). When a collision occurs in the subframe having the CSI report(s) on the PUCCH a lower priority CSI report may be dropped from the transmission.