HARQ Rate Matching with Variable Bit Selection Coverage
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Solution Overview
Problem
The probability of overlapping phenomena is high in existing rate matching processes, leading to inefficient data transmission and reduced system performance in HARQ retransmissions.
Innovation Solution
A method and device that change the manner of selecting bits from the mother code codeword to generate HARQ subpackets, ensuring comprehensive coverage of the mother code data and minimizing overlapping, by employing various approaches for determining the start position of the subpacket, such as selecting from the first, last, or middle positions of the codeword.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conventional rate matching algorithm is used to select bits from the mother code codeword, then the implementation is simple, but the overlapping phenomena occurs frequently leading to poor transmission efficiency
Solution Approach 1:
The patent changes the parameter of bit selection by introducing a variable step length that adapts based on the current transmission attempt. Instead of using a fixed or simple sequential selection method, the step length is dynamically adjusted to skip over previously transmitted bits, thereby reducing overlapping phenomena while maintaining implementation feasibility.
2Ease of operation
If bits are selected sequentially from the mother code codeword, then the selection process is simple, but the coverage of mother code data is insufficient and overlapping occurs
Solution Approach 1:
The patent introduces dynamic behavior to the bit selection process by making the step length variable rather than fixed. The step length changes based on the transmission context, allowing the selection process to adaptively cover more of the mother code data while avoiding overlapping. This dynamic approach improves reliability without significantly complicating the operation.
3Stability of the object's composition
If the same start position is used for HARQ retransmissions, then the process is consistent and simple, but the overlapping phenomena reduces system performance
Solution Approach 1:
The patent applies preliminary action by calculating and determining the step length before the actual bit selection process. This pre-determined step length is designed to prevent overlapping by skipping over bits that have already been transmitted in previous attempts. This approach maintains consistency in the process while improving system performance through better data coverage.
Data Source
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AI summary
The present invention discloses a rate matching method and device. The method includes that: an information bit sequence is coded and interleaved to obtain a mother code codeword with a length NFB_Buffer; and bits are selected from the mother code codeword to generate a hybrid automatic repeat request (HARQ) subpacket for current transmission. By means of the present invention, the effect of covering the whole mother code area can be achieved as much as possible, and the performance of the HARQ multiple retransmission link can be enhanced.