CSI Feedback Subframe Prioritization for TDD Collision

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Solution Overview

Problem

Dynamic reconfiguration of TDD subframe configurations in wireless communication systems, such as LTE, can cause issues with channel state information (CSI) measurements and reporting, leading to collisions and invalid measurement reports due to changes in resource allocation and interference management.

Innovation Solution

The method involves prioritizing one subframe set over another for CSI reporting in cases of collision, allowing for flexible placement of interference measurement resources (IMRs) not constrained to a 5ms grid, and determining valid downlink subframes for CSI measurements to ensure accurate reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple subframe sets are configured for CSI reporting with flexible IMR placement, then adaptability and spectral efficiency are improved, but collision between CSI reporting instances occurs leading to reliability degradation

Engineering Contradiction:

Improveflexible IMR placementVSAvoidCSI reporting reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the parameter of IMR placement from fixed 5ms grid constraints to flexible placement across different subframe sets. This allows the system to adapt IMR positions according to traffic patterns and interference conditions, improving spectral efficiency while managing collision scenarios through prioritization rules

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the uplink subframes into different CSI reporting instances and assigns priority levels to different subframe sets. By dividing the reporting mechanism into prioritized segments, the system can handle collisions by processing high-priority reports first, thereby maintaining reliability despite flexible IMR placement

Inventive Principle:

Principle #1Segmentation

2Productivity

If dynamic reconfiguration of TDD subframe configurations is implemented, then productivity and resource utilization are improved, but measurement precision and reporting accuracy deteriorate due to collisions

Engineering Contradiction:

Improveresource utilizationVSAvoidCSI measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements dynamic reconfiguration of TDD subframe configurations, allowing the system to adaptively change uplink/downlink subframe assignments based on traffic demands. This dynamic adjustment improves resource utilization while the associated collision handling mechanisms preserve measurement precision through prioritization rules

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes preliminary prioritization rules for different subframe sets before collisions occur. By pre-defining which subframe sets have higher priority for CSI reporting, the system ensures that even under dynamic reconfiguration, measurement precision is maintained by knowing in advance which reports should be processed

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3860029A1Multiple subframe set CSI feedback

Publication Date: 2021.08.04 QUALCOMM INC

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AI summary

Certain aspects of the present disclosure relate to techniques and methods for reporting channel state information (CSI) feedback, for example, for UEs capable of supporting evolved interference management traffic adaptation (eIMTA).