Terminal Device CSI Feedback for URLLC Control Channel Reliability

Solution Overview

Problem

The existing communication systems face challenges in reducing feedback overhead and improving the reliability of the control channel, particularly in ultra-reliable and low-latency communication (URLLC) services, which are essential for efficient transmission and limited retransmission opportunities in 5G NR.

Innovation Solution

A method where a terminal device determines channel state information (CSI) based on downlink data, specifically by calculating a difference value between the target modulation and coding scheme (MCS) level and the actual MCS level, and sends this CSI to a network device, thereby reducing feedback overhead and enhancing control channel reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional feedback methods are used in 5G NR URLLC services, then complete channel state information can be provided, but feedback overhead increases and retransmission opportunities are consumed

Engineering Contradiction:

Improvecontrol channel reliabilityVSAvoidfeedback overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts only the essential feedback information (CSI) needed for reliable communication from the complete channel state information, transmitting only this critical subset to reduce feedback overhead while maintaining control channel reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The feedback information is segmented into critical CSI elements that are most important for URLLC reliability, separating them from less critical information to optimize the trade-off between feedback overhead and reliability

Inventive Principle:

Principle #1Segmentation

2Reliability

If traditional feedback methods are used in 5G NR URLLC services, then complete channel state information can be provided, but the number of retransmission opportunities decreases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidtransmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts only the essential feedback information (CSI) needed for reliable communication from the complete channel state information, transmitting only this critical subset to reduce feedback overhead while maintaining control channel reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies partial action by transmitting only the necessary portion of channel state information rather than complete CSI, which is sufficient to maintain reliability while improving transmission efficiency through reduced feedback overhead

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If detailed channel state information is fed back, then transmission efficiency can be improved, but feedback overhead increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidfeedback overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent extracts only the essential feedback information (CSI) needed for reliable communication from the complete channel state information, transmitting only this critical subset to reduce feedback overhead while maintaining control channel reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12107648B2Method for feeding back and receiving information, and device

Publication Date: 2024.10.01 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided are a method for feeding back and receiving information, and a device. The method comprises: a terminal device determines channel state information (CSI); the terminal device sends the CSI to a network device. In embodiments of the present application, quick feedback of the CSI by the terminal device can effectively reduce feedback overhead, thereby improving the reliability of a control channel.