Adaptive CSI Compression Selection for Low-Rank Feedback Overhead

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing Channel State Information (CSI) feedback overhead, which can be significant and inefficient, particularly in scenarios where the channel rank is smaller than a configured threshold.

Innovation Solution

Implementing a wireless transmit/receive unit (WTRU) capable of full-channel CSI compression and eigenvector-based CSI compression, allowing the WTRU to select between different CSI compression types based on the channel rank, including eigenvector (EV) based compression to reduce feedback overhead when the determined rank is below a threshold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If full-channel CSI compression is used, then CSI feedback overhead is reduced, but compression efficiency is insufficient when channel rank is small

Engineering Contradiction:

ImproveCSI feedback overheadVSAvoidcompression efficiency

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The patent segments the CSI compression approach into two distinct methods: full-channel compression and eigenvector-based compression. The WTRU selects between these two segmentation-based approaches depending on the channel rank condition, achieving optimal compression efficiency for different scenarios

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the compression parameter based on channel rank. When rank < threshold, eigenvector-based compression is selected; otherwise, full-channel compression is used. This parameter change strategy optimizes compression efficiency while adapting to different channel conditions

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If eigenvector-based compression is always used, then feedback overhead is reduced, but system complexity increases

Engineering Contradiction:

Improvefeedback overheadVSAvoidcompression method selection complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent implements a dynamic selection mechanism where the WTRU adapts the compression method based on real-time channel rank measurements. The system dynamically switches between full-channel and eigenvector-based compression, with the network entity also adapting its processing accordingly

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses feedback mechanisms where the WTRU reports channel rank information to the network entity, which then configures the appropriate compression threshold. This feedback loop enables the system to optimize compression overhead while managing complexity through coordinated adaptation

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20260025177A1Methods and apparatus for CSI feedback overhead reduction using compression

Publication Date: 2026.01.22 INTERDIGITAL PATENT HOLDINGS INC

AI summary

The disclosure pertains to methods and apparatus for reporting channel state information (CSI) feedback in wireless telecommunication networks. In an example, a method implemented in a wireless transmit/receive unit (WTRU) may include receiving configuration information indicating a channel rank threshold, determining a channel rank associated with a channel measurement, selecting a type of CSI compression based on the channel rank and the channel rank threshold, and transmitting CSI and information indicating the selected type of CSI compression, and the CSI is associated with the channel measurement and was compressed using the selected type of CSI compression.