HARQ Feedback Signalling for Selective Code Block Retransmission
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Solution Overview
Problem
Current HARQ mechanisms in wireless communications are inefficient in handling large transport block sizes, leading to unnecessary retransmissions of entire blocks due to single-bit feedback, which increases resource usage and processing complexity.
Innovation Solution
Implementing a multi-bit feedback mechanism that provides detailed information on the state of individual code blocks, allowing for targeted retransmissions of only failed blocks, thereby reducing the retransmission channel usage and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-bit feedback is used in HARQ mechanisms, then the feedback mechanism is simple, but retransmission efficiency deteriorates due to unnecessary retransmissions of entire blocks
Solution Approach 1:
The patent segments the transport block into multiple code blocks and provides separate feedback for each code block. Instead of using a single-bit feedback for the entire transport block, the system generates individual feedback bits for each code block based on its decoding status, enabling selective retransmission of only failed code blocks rather than retransmitting the entire block.
Solution Approach 2:
The patent transitions from a single-bit feedback dimension to a multi-bit feedback dimension by introducing feedback at the code block level. This dimensional expansion allows the system to provide detailed information about the status of individual code blocks, enabling more precise control over retransmissions and improving overall system efficiency.
2Productivity
If multi-bit feedback mechanism is implemented to provide detailed code block state information, then retransmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the feedback mechanism into individual feedback bits corresponding to each code block. This segmentation allows the system to provide detailed status information for each code block while maintaining a structured and manageable feedback format that can be efficiently processed by both transmitter and receiver.
Solution Approach 2:
The patent implements a dynamic feedback mechanism where the number of feedback bits is determined by the number of code blocks in the transport block. The feedback mechanism adapts to different transport block sizes and configurations, providing multi-bit feedback only when necessary and maintaining flexibility in handling various transmission scenarios.
3Loss of energy
If targeted retransmission of failed code blocks is enabled, then resource allocation is optimized, but processing complexity increases due to individual code block identification
Solution Approach 1:
The patent segments the transport block into multiple independently identifiable code blocks, each with its own feedback bit. This segmentation enables the receiver to identify which specific code blocks failed decoding and allows the transmitter to retransmit only those specific code blocks, avoiding the waste of retransmitting successfully decoded portions of the transport block.
Solution Approach 2:
The patent implements a detailed feedback mechanism where each code block's decoding status is reported individually to the transmitter. This feedback information enables the transmitter to make informed decisions about selective retransmission, optimizing resource allocation by transmitting only the necessary code blocks that require retransmission.
Data Source
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AI summary
A method comprises detecting (205), in a first communications apparatus, the number of failed code blocks in a transport block transmitted (204) to the first apparatus from a second apparatus and a corresponding feedback size indicator. The feedback size in dicator is received (203) in the first apparatus from the second apparatus e.g. via con trol channel signalling (202). Alternatively, the feedback size indicator is received in the transport block. The first apparatus selects (205) the format of a HARQ feedback message to be generated based on the feedback size indicator, and generates (205) the feedback message based on the number of failed code blocks in the transport block. The generated feedback message is of the selected format and indicates the failed code blocks in the transport block. The first apparatus transmits (206) the generated feed back message to the second apparatus.