Dual Thread Feedback for Non-Orthogonal Channels

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Solution Overview

Problem

Current wireless communication systems face challenges in optimizing channel scheduling for non-orthogonal channels, particularly in multiple-access systems employing multiple antennas, which leads to inefficiencies in resource allocation and performance.

Innovation Solution

The implementation of dual-thread feedback mechanisms, where user equipment (UEs) provide channel feedback independent of transmission strategies, allowing eNodeB to determine and send sets of transmission strategies, and UEs select and report channel state information (CSI) for optimized scheduling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional single-thread feedback mechanisms are used for channel scheduling, then system complexity is reduced, but channel scheduling efficiency and resource allocation performance deteriorate

Engineering Contradiction:

Improvechannel scheduling efficiencyVSAvoidfeedback mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The feedback mechanism is divided into two independent threads: Thread 1 for channel feedback reporting (including channel measurement matrix and noise covariance) and Thread 2 for transmission strategy selection and CSI reporting. This segmentation allows each thread to perform its specific function efficiently without interfering with the other, thereby improving overall scheduling efficiency while managing complexity through functional separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station determines and sends multiple transmission strategy sets to UEs in advance, before the actual scheduling decision is made. UEs use these pre-provided strategies to calculate and report CSI, which then enables the base station to make optimized scheduling decisions. This preliminary action improves scheduling efficiency by having all necessary information prepared beforehand.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If transmission strategy-dependent feedback is used, then feedback is simplified, but scheduling optimization for non-orthogonal channels is limited

Engineering Contradiction:

Improvescheduling optimization capabilityVSAvoidfeedback information completeness

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a dual-thread feedback mechanism where UEs report channel feedback in Thread 1 independent of transmission strategies, and then report CSI for selected transmission strategies in Thread 2. This comprehensive feedback loop ensures the base station receives both raw channel measurements and strategy-specific performance information, enabling optimal scheduling decisions for non-orthogonal channels.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If multiple transmission strategies are evaluated by UEs, then scheduling accuracy is improved, but computational complexity and reporting overhead increase

Engineering Contradiction:

Improvechannel quality prediction accuracyVSAvoidfeedback overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

Instead of requiring UEs to evaluate and report CSI for all possible transmission strategies, the patent requires UEs to select and report CSI only for a subset of strategies from the provided sets. This partial action approach maintains scheduling accuracy by focusing on the most relevant strategies while significantly reducing feedback overhead compared to evaluating all possible strategies.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3195509B1Dual thread feedback design for non-orthogonal channels

Publication Date: 2020.07.22 QUALCOMM INC

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AI summary

Dual-thread feedback for non-orthogonal channels used in wireless communications systems is described. A first feedback thread may employ transmission strategy (TS) independent feedback and a second feedback thread may employ TS dependent feedback. The first feedback thread may include channel feedback from channel measurements (e.g., channel gain, noise covariance, etc.) and may be fed back periodically. A TS space may be determined that includes combinable TSs for UEs that may be grouped for non-orthogonal techniques, and one or more TS sets may be sent to the UEs. UEs may determine channel quality and/or other channel state information (CSI) for the TSs and report CSI for one or more TSs of the TS sets in a second feedback thread. Scheduling may be performed for transmissions to the UEs based on the feedback in the first and/or second feedback threads.