Wireless Feedback Communications for Transport Blocks with Multiple Code Block Groups

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in feedback communications for transport blocks with multiple code block groups, particularly in terms of resource utilization and overhead signaling.

Innovation Solution

A method and apparatus for wireless communication that allow a user equipment (UE) to receive a transport block with multiple code block groups (CBGs) and transmit feedback using a reduced number of feedback bits, which jointly encode acknowledgement/negative acknowledgement feedback and additional information such as the location of incorrectly decoded CBGs or the quantity of incorrectly decoded CBGs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If feedback communication uses one bit per CBG to indicate ACK/NACK status, then feedback accuracy is improved, but feedback overhead increases significantly

Engineering Contradiction:

Improvefeedback accuracyVSAvoidfeedback overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent merges multiple feedback bits into a single feedback communication by using bit indexing to represent CBG indices. Instead of transmitting separate ACK/NACK bits for each CBG, the system transmits a compact representation where the bit position indicates which CBG received the feedback, reducing overhead while maintaining accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The feedback communication mechanism is designed to serve multiple purposes: it indicates both the status (ACK/NACK) and the identity (CBG index) of the code block group. This multi-functional approach eliminates the need for separate signaling mechanisms, reducing overall overhead while preserving feedback precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If the number of feedback bits is reduced below the number of CBGs, then resource utilization is improved, but feedback information completeness may be compromised

Engineering Contradiction:

Improveresource utilizationVSAvoidfeedback information completeness

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent transitions from a one-to-one mapping (one feedback bit per CBG) to a many-to-one mapping where multiple CBGs share feedback bits through indexing. By utilizing the dimensional space of bit positions and combinations, the system encodes more information in fewer bits, maintaining completeness while improving resource utilization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The system changes the parameter representation from direct feedback bits to indexed feedback bits. By using the position and combination of feedback bits as parameters to encode CBG indices and status, the system achieves compact representation that preserves all necessary feedback information without requiring proportional overhead.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12278774B2Feedback communications for transport blocks with multiple code block groups

Publication Date: 2025.04.15 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a transport block that includes a number of code block groups (CBGs). The UE may transmit a feedback communication associated with the transport block, wherein the feedback communication indicates feedback associated with the CBGs using a number of feedback bits, and wherein the number of feedback bits is less than the number of CBGs of the transport block. Numerous other aspects are described.