Sidelink CSI-RS Selective Reporting for 5G Resource Efficiency

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently managing channel state information (CSI) reporting between user equipments (UEs) via sidelink channels, leading to suboptimal resource utilization and inefficient CSI reporting.

Innovation Solution

Implementing a method where a UE transmitting sidelink CSI-RSs can selectively choose which UEs within a group report CSI, allowing for targeted and staggered CSI reporting, thereby optimizing system resource usage and adapting reporting to specific UEs of interest.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If all UEs in a group report CSI for groupcast sidelink CSI-RS, then comprehensive channel state information is obtained, but resource overhead and signaling complexity increase significantly

Engineering Contradiction:

Improvechannel state information completenessVSAvoidsignaling complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent segments the group of UEs into different categories based on their reporting requirements. Instead of requiring all UEs to report CSI, only specific UEs (such as those with poor channel conditions or specific service requirements) are selected to report, thereby reducing overall signaling complexity while maintaining necessary information completeness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by requiring only a subset of UEs to report CSI rather than all UEs. The gNB selectively requests CSI reports from specific UEs based on scheduling decisions, channel conditions, and service requirements, reducing resource overhead while obtaining sufficient channel state information for effective scheduling.

Inventive Principle:

Principle #16Partial or excessive action

2Loss of information

If all UEs in a group report CSI simultaneously, then complete channel state information is available, but uplink resource conflicts and interference increase

Engineering Contradiction:

Improvechannel state information availabilityVSAvoiduplink interference

Core Design Contradiction:

Loss of informationVSObject-affected harmful factors

Solution Approach 1:

The patent implements periodic and staggered CSI reporting where UEs transmit CSI reports at different times rather than simultaneously. The gNB schedules CSI report transmissions in different uplink slots or subframes, reducing uplink interference and resource conflicts while ensuring complete channel state information is collected over time.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The gNB performs preliminary scheduling decisions to determine which UEs should report CSI and when they should transmit their reports. This advance planning prevents resource conflicts and interference by allocating different time-frequency resources to different UEs before the actual CSI reporting occurs.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If selective CSI reporting is implemented, then resource utilization improves, but the mechanism for selecting which UEs report adds system complexity

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidselection mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs feedback mechanisms where UEs report channel quality indicators (CQIs) and other metrics that enable the gNB to make informed scheduling decisions. This feedback loop allows the system to dynamically select which UEs should report CSI based on current channel conditions, service requirements, and resource availability, improving resource utilization without requiring complex predetermined selection criteria.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent enables UEs to self-select for CSI reporting based on their channel conditions and service requirements. UEs that experience poor channel conditions or have specific service needs can autonomously indicate their desire to report CSI, reducing the need for complex centralized selection mechanisms while improving resource utilization efficiency.

Inventive Principle:

Principle #25Self-service

4Measurement precision

If frequent CSI reporting is required from all UEs, then real-time channel state information is maintained, but energy consumption and signaling overhead increase

Engineering Contradiction:

Improvechannel state information timelinessVSAvoidUE energy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic CSI reporting where the reporting frequency and requirement for each UE is adjusted based on current channel conditions, service requirements, and UE energy status. Instead of uniform frequent reporting from all UEs, the system adaptively determines which UEs need to report and how frequently, maintaining real-time channel state information for critical UEs while reducing energy consumption for others.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11546105B2Groupcast sidelink CSI-RS with selective CSI reports

Publication Date: 2023.01.03 QUALCOMM INC

AI summary

Some aspects provide a method for wireless communication by a first wireless device. The method generally includes transmitting one or more sidelink channel state information (CSI) reference signals (CSI-RSs) targeting a group of user equipments (UEs). The method generally includes requesting one or more CSI reports from a selected one or more UEs of the group of UEs. The method generally includes receiving one or more CSI reports from the selected one or more UEs.