Joint Error Correction Coding for Self-Decodable Payload Blocks
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Solution Overview
Problem
Current coding methods for 6G wireless communications face challenges in balancing ultra-reliability and low latency, as hybrid automatic repeat request (HARQ) incurs long round-trip delays, and joint coding requires decoding the entire codeword before individual payloads can be decoded, which is inefficient for mixed-service applications.
Innovation Solution
Implementing a joint error correction coding scheme that allows for self-decodable encoded blocks within a codeword, enabling independent decoding of individual payloads and joint decoding with other blocks, thereby supporting unequal error protection and reducing retransmission latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hybrid automatic repeat request (HARQ) is employed to reduce block error rate, then ultra-reliability is improved, but round-trip delay increases
Solution Approach 1:
The codeword is segmented into multiple encoded blocks, each corresponding to a different payload. This segmentation allows the receiver to decode individual blocks independently without waiting for the entire codeword, thereby reducing latency while maintaining reliability through selective retransmission of only failed blocks.
Solution Approach 2:
The system dynamically adapts the decoding process by allowing early termination for successfully decoded blocks while continuing to process remaining blocks. This dynamic approach enables the receiver to switch between immediate decoding and retransmission requests based on real-time decoding status, optimizing both reliability and latency.
2Reliability
If joint coding is used to provide unequal error protection for different payloads, then reliability requirements are met, but decoding delay increases because the entire codeword must be received
Solution Approach 1:
The joint codeword is divided into multiple encoded blocks that can be independently decoded. Each block contains error protection for its corresponding payload, allowing the receiver to decode individual blocks as they are received without waiting for the complete codeword, thus reducing decoding delay while maintaining unequal error protection.
Solution Approach 2:
The encoding structure is designed in advance to enable self-decodability of individual blocks. By pre-organizing the codeword into independently decodable units with appropriate error protection, the system prepares the data structure to allow immediate decoding of received blocks without requiring the entire codeword to be assembled first.
3Loss of time
If code rate is reduced to meet low-latency requirements without retransmission, then latency is improved, but spectrum efficiency deteriorates
Solution Approach 1:
By segmenting the codeword into independently decodable blocks, the system enables selective retransmission of only failed blocks rather than retransmitting the entire codeword. This reduces the average number of retransmissions needed, improving spectrum efficiency while maintaining low latency for successfully decoded blocks.
Solution Approach 2:
The system changes the parameter of code rate application by using different effective code rates for different blocks based on their decoding status. Successfully decoded blocks effectively use higher code rates (more efficient), while failed blocks trigger targeted retransmissions with appropriate code rates, optimizing overall spectrum efficiency.
Data Source
AI summary
Joint error correction coding of multiple self-decodable payloads involves encoding multiple individual payloads with an error correcting code, to generate a codeword. The codeword includes multiple encoded blocks that respectively correspond to the individual payloads. One or more of the individual payloads or encoded blocks are self-decodable independently of other payloads or encoded blocks, and are also jointly decodable with one or more of the other payloads or encoded blocks.