UE Channel State Feedback via PDSCH Decoding

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Solution Overview

Problem

Accurate channel state feedback (CSF) in wireless communications is challenging due to complexity constraints, timing issues, and interference discrepancies, leading to insufficient CSF accuracy, especially in dynamic spectrum sharing scenarios where interference observed in data channels is not reflected in channel state information reference signals (CSI-RS).

Innovation Solution

The method involves decoding information from a physical downlink shared channel (PDSCH) to determine and update CSF, allowing for frequent reporting that accounts for interference experienced in the UE data channel, even in the absence of CSI-RS measurements, thereby enhancing CSF accuracy and throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If channel state feedback is updated frequently based on PDSCH decoding information, then CSF accuracy and convergence speed are improved, but device complexity and processing overhead increase

Engineering Contradiction:

ImproveCSF accuracyVSAvoidprocessing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The UE utilizes its own PDSCH decoding performance information to update and refine CSF, enabling the system to self-improve feedback accuracy without requiring additional external measurement resources or complex coordination mechanisms

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes the parameter being measured from traditional CSI-RS channel quality to PDSCH decoding performance metrics, allowing CSF to reflect actual demodulation and decoding conditions experienced by the UE

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If CSF is updated based on PDSCH decoding information, then interference accuracy is improved, but timing constraints and reporting overhead worsen

Engineering Contradiction:

Improveinterference accuracyVSAvoidreporting time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The UE continuously updates CSF based on ongoing PDSCH decoding performance rather than relying on periodic CSI-RS measurements, maintaining continuous awareness of actual channel conditions including interference without requiring additional measurement time

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system implements a feedback loop where PDSCH decoding results are fed back to update CSF, creating a closed-loop system that automatically adapts to changing interference conditions based on actual reception performance

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11968686B2Enhanced user equipment channel state feedback capability with frequent reporting

Publication Date: 2024.04.23 QUALCOMM INC

AI summary

A method of wireless communications by a user equipment (UE) includes decoding information received from a base station via a physical downlink shared channel (PDSCH). The UE determines whether to update channel state feedback based on the decoded information. The channel state feedback is updated based on the determination to generate updated channel state feedback. The updated channel state feedback is transmitted to the base station. The UE is configured to update the channel state feedback without an additional measurement of a channel state information reference signal (CSI-RS).