CBG and TB Feedback Selection for Wireless Carriers

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Solution Overview

Problem

Wireless communication systems face challenges in efficiently configuring feedback schemes for multiple component carriers (CCs) or transmission time intervals (TTIs), particularly in managing feedback resources and error patterns, which can lead to insufficient feedback capacity and inefficient data retransmissions.

Innovation Solution

A method where user equipment (UE) selects between code block group (CBG) feedback and transport block (TB) feedback for each CC or TTI based on available feedback resources and error patterns, optimizing feedback transmission by determining which CCs or TTIs to use CBG or TB feedback, ensuring efficient resource allocation and error handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If CBG feedback is used for all CCs or TTIs, then feedback precision is improved, but feedback resource consumption increases

Engineering Contradiction:

Improvefeedback precisionVSAvoidfeedback resource consumption

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent segments the feedback approach by dividing CCs or TTIs into different groups: some are configured for CBG feedback (higher precision) while others are configured for TB feedback (lower precision). This segmentation allows the system to achieve high feedback precision for critical carriers or time intervals while conserving feedback resources by using coarser feedback for less critical ones, thus resolving the contradiction between feedback precision and resource consumption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by allowing different feedback modes (CBG or TB) to be applied to different CCs or TTIs based on their specific characteristics such as error patterns, channel conditions, or service requirements. This localized approach enables high precision feedback where needed while using resource-efficient feedback elsewhere, balancing precision and resource consumption across the system.

Inventive Principle:

Principle #3Local quality

2Loss of information

If CBG feedback is selected for multiple CCs, then feedback information granularity is improved, but available feedback resources are depleted

Engineering Contradiction:

Improvefeedback information granularityVSAvoidavailable feedback resources

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent implements partial action by selecting CBG feedback for only a subset of CCs or TTIs rather than all of them. The UE determines which specific CCs or TTIs should receive high-granularity CBG feedback based on factors like error patterns and channel conditions, while other CCs use TB feedback. This partial application of high-granularity feedback achieves sufficient information quality without exhausting feedback resources.

Inventive Principle:

Principle #16Partial or excessive action

3Quantity of substance

If TB feedback is used for all CCs or TTIs, then feedback resource usage is reduced, but error handling efficiency deteriorates

Engineering Contradiction:

Improvefeedback resource usageVSAvoiderror handling efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent applies local quality by configuring different feedback modes for different CCs or TTIs based on their specific error characteristics and channel conditions. For CCs or TTIs experiencing poor channel conditions or high error rates, CBG feedback is applied to improve error handling efficiency through more granular feedback. For CCs with good channel conditions, TB feedback suffices, conserving resources. This localized differentiation resolves the contradiction between resource usage and error handling efficiency.

Inventive Principle:

Principle #3Local quality

4Adaptability or versatility

If the UE selects feedback mode dynamically, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvefeedback mode adaptabilityVSAvoidUE processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements self-service by enabling the UE to autonomously determine and select the appropriate feedback mode (CBG or TB) for each CC or TTI based on pre-configured parameters and observed channel conditions. The UE uses its own measurements of error patterns and channel quality to make these decisions without requiring complex centralized control or continuous network intervention, thus achieving high adaptability while keeping the implementation complexity manageable at the UE side.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11785587B2Code block group feedback techniques for multiple carriers or transmission time intervals

Publication Date: 2023.10.10 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communication are described that provide for configuration of multiple component carriers (CCs) or multiple transmission time intervals (TTIs) for data transmission to a user equipment (UE). Feedback resources may be configured for transmission of feedback information from the UE, and one or more CCs or TTIs may be configured for either code block group (CBG) feedback or transport block (TB) feedback, and one or more other CCs or TTIs may be configured for TB feedback. A UE may select whether to use CBG feedback or TB feedback for one or more CCs or TTIs, based at least in part on an amount of feedback information to be transmitted, an amount of available feedback resources, an error pattern associated with one or more of the CCs or TTIs, or any combination thereof.