CSI Reporting Using PDSCH-DMRS for Low-Latency Channel Feedback

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional CSI reporting techniques in wireless communication systems face limitations such as feedback delay and overhead, particularly in adapting to changing channel conditions, and may not efficiently utilize PDSCH/DMRS as measurement resources.

Innovation Solution

Implementing UE initiated CSI reporting and downlink grant based CSI reporting, utilizing PDSCH/DMRS as measurement resources, with dedicated uplink resources for CSI reporting, to enhance flexibility and reduce delay in adapting to channel conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional CSI reporting techniques are used, then system reliability is maintained, but feedback delay increases and adaptability to changing channel conditions deteriorates

Engineering Contradiction:

Improvesystem reliabilityVSAvoidfeedback delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by configuring multiple uplink resources in advance for CSI reporting. The UE is provided with multiple configured uplink resources before channel conditions change, allowing it to select and use an appropriate resource immediately when CSI reporting is needed, eliminating the time required for resource allocation negotiations and reducing feedback delay while maintaining reliable communication.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic resource selection where the UE can adaptively choose from multiple configured uplink resources based on current channel conditions and timing requirements. This dynamic approach allows the system to respond flexibly to changing channel states, selecting the most appropriate uplink resource for each CSI reporting instance, thereby reducing feedback delay while maintaining system reliability through multiple available options.

Inventive Principle:

Principle #15Dynamics

2Quantity of substance

If conventional CSI reporting techniques are used, then overhead is reduced, but adaptability to changing channel conditions deteriorates

Engineering Contradiction:

ImproveoverheadVSAvoidadaptability to channel conditions

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The system performs preliminary configuration of multiple uplink resources in advance through RRC signaling, establishing a pool of available resources before they are needed. This preliminary action eliminates the need for dynamic resource allocation negotiations during CSI reporting, reducing signaling overhead while providing the UE with multiple pre-configured options to adapt to varying channel conditions efficiently.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE autonomously selects the appropriate uplink resource from the configured resources based on its own assessment of channel conditions and timing requirements. This self-service mechanism eliminates the need for additional signaling between UE and network for resource allocation, reducing overhead while maintaining high adaptability as the UE independently makes optimal resource selection decisions based on real-time channel state.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If dedicated uplink resources are allocated for CSI reporting, then adaptability to channel conditions improves, but device complexity increases

Engineering Contradiction:

Improveadaptability to channel conditionsVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The network performs preliminary configuration of multiple uplink resources through RRC signaling before CSI reporting is needed. This advance configuration reduces device complexity by establishing resource pools in advance, eliminating the need for complex real-time resource allocation algorithms in the UE. The UE simply selects from pre-configured resources, maintaining adaptability while reducing computational and signaling complexity.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If CSI reporting is enabled in the same frame as PDSCH, then productivity improves, but device complexity increases

Engineering Contradiction:

ImprovethroughputVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Multiple uplink resources are preliminarily configured in advance with different timing relationships to PDSCH. This allows the UE to select a resource that enables CSI reporting in the same frame as PDSCH when needed, improving throughput by reducing feedback delay. The preliminary configuration approach maintains relatively simple device complexity as the UE only needs to select from pre-defined resource options rather than dynamically allocate resources.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12604314B2Channel state information (CSI) processing for UE initiated CSI and downlink grant CSI

Publication Date: 2026.04.14 QUALCOMM INC

AI summary

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for transmitting a channel state information (CSI) report from a user equipment (UE). The CSI report may be a UE initiated CSI report or may be based on a downlink grant. The UE may receive a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS). The UE may determine to report a CSI in response to a measurement of a downlink measurement resource or in response to the downlink grant requesting the CSI. The UE may determine a reserved uplink resource on which to report the CSI. The UE may transmit a CSI report on the reserved uplink resource.