Source-Coded HARQ Retransmission Using Bit Priority Feedback
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Solution Overview
Problem
HARQ methods in current digital communication systems do not leverage features of source coding, failing to prioritize retransmissions based on the importance or priority of compressed bits, leading to suboptimal error correction and resource utilization.
Innovation Solution
Implement a HARQ method for source coding that prioritizes retransmissions of higher priority blocks or bits, using cyclic redundancy checks (CRC) and source decoding outcomes to determine and favor retransmission of more important blocks, potentially with or without channel encoding for forward error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission is applied to channel coding only, then error correction can be performed, but source coding features and bit priority information are not leveraged
Solution Approach 1:
The patent merges HARQ retransmission mechanisms with source coding priority information by integrating CRC checks at the source coding block level and using source decoding outcomes to guide retransmission decisions, thereby combining error detection capabilities with adaptability to source coding features
Solution Approach 2:
The patent implements feedback loops where the receiving device performs source decoding and generates outcomes that are fed back to the transmitting device, enabling the transmitting device to identify and retransmit specific high-priority blocks that failed source decoding
2Reliability
If all source encoded bits are retransmitted equally, then complete error correction may be achieved, but resource usage increases
Solution Approach 1:
The patent segments source encoded bits into multiple blocks with different priority levels, allowing selective retransmission of only the high-priority blocks that failed source decoding rather than retransmitting all blocks equally
Solution Approach 2:
The patent applies different retransmission priorities to different blocks of source encoded bits based on their local quality or importance to source decoding success, with high-priority blocks receiving preferential retransmission treatment
3Productivity
If source decoding outcome is used to guide retransmission, then retransmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent performs preliminary source decoding at the receiving device before retransmission decisions are made, using the source decoding outcome to identify which specific high-priority blocks require retransmission, thereby avoiding the need for complex real-time analysis during retransmission
Data Source
AI summary
A HARQ method implemented in relation to channel coding may be suboptimal in that the HARQ method does not leverage features of the source coding. For example, it makes no difference to the HARQ method whether source coding is even performed, let alone whether some portions of the compressed bits output from the source encoder have higher levels of priority, e.g. higher levels of importance to the success of the source decoding. In some embodiments, a HARQ method for source coding is provided. The HARQ method for source coding may be performed with or without channel coding. A first set of source encoded bits may be sent in a first transmission (e.g. an initial transmission), and a second set of source encoded bits may be sent in a second transmission (e.g. a retransmission) based on feedback. The feedback may be an indication of source decoding outcome.