Selective Codeword Retransmission for Wireless Error Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication, conventional data retransmission methods require retransmitting the entire codeword when errors occur, leading to inefficient use of transmission resources due to the large amount of data being retransmitted, especially at high transmission rates.
Innovation Solution
A method where the receiving apparatus identifies erroneous codeword groups and sends error indication information to the transmitting apparatus, allowing for targeted retransmission of only the erroneous parts using a second check matrix, enabling correct decoding with reduced data retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting apparatus retransmits the entire initial codeword when an error occurs, then the receiving apparatus can ensure correctness of the received data, but the transmission resources are occupied due to the large amount of data retransmitted
Solution Approach 1:
The initial codeword is divided into multiple codeword groups, and only the erroneous codeword group(s) are identified and retransmitted separately, rather than retransmitting the entire codeword. This segmentation allows selective retransmission of only the necessary portion.
Solution Approach 2:
The receiving apparatus extracts and identifies the specific erroneous codeword group from the received data, then requests retransmission of only that extracted erroneous portion, separating the error handling from the complete data retransmission.
2Reliability
If the transmitting apparatus re-encodes all content of the initial codeword for retransmission, then the receiving apparatus can recover from errors, but the retransmission process becomes inefficient due to large data amount
Solution Approach 1:
The retransmission process is segmented into error identification, error localization to specific codeword groups, and selective retransmission of only those groups, improving overall retransmission efficiency while maintaining error recovery capability.
Solution Approach 2:
The system changes the parameter of retransmitted data from complete codeword to partial codeword group, reducing the data volume while maintaining the ability to recover from errors through targeted retransmission.
3Speed
If the size of the initial codeword is increased to achieve high transmission rate, then the transmission speed improves, but the retransmission overhead increases when errors occur
Solution Approach 1:
By segmenting the large initial codeword into multiple smaller codeword groups, the system enables high transmission rates while reducing retransmission overhead, as only the erroneous groups need to be retransmitted rather than the entire large codeword.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
Embodiments of the present invention disclose a data retransmission method and a related apparatus. When receiving a first data frame sent by a transmitting apparatus, a receiving apparatus may return error indication information including an identifier of at least one erroneous codeword group to the transmitting apparatus if it is found that an error occurs in an initial codeword of the first data frame. The transmitting apparatus may obtain the erroneous codeword group and encode the erroneous codeword group, and retransmit a part of a sub check codeword obtained through encoding to the receiving apparatus. The receiving apparatus may obtain a third check matrix based on the first check matrix, a second check matrix, and a location of the at least one erroneous codeword group in the initial codeword, and re-decode the retransmitted partial sub check codeword and content of the first data frame together based on the third check matrix, so as to obtain a correct initial codeword. It can be learned that on the premise of implementing correct decoding of an erroneous part, a data amount of retransmitted data can be reduced, and data retransmission efficiency is improved.