5G Transport Block Size Calculation for LDPC Code Rate Adaptation
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Solution Overview
Problem
In 5G communication systems, determining an optimal transport block size (TBS) for efficient data transmission is challenging due to varying channel conditions and code rates, which affects data reliability and throughput.
Innovation Solution
A method and apparatus for determining TBS by a terminal and base station using control information, where the TBS is identified based on the number of temporary information bits and code rate, with specific formulas for different code rate ranges to ensure the TBS is a multiple of both 8 and the number of temporary code blocks, facilitating efficient data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the TBS is determined using conventional methods without considering LDPC code characteristics, then the determination process is simpler, but the data transmission efficiency and reliability deteriorate due to unnecessary bit additions and suboptimal resource allocation
Solution Approach 1:
The patent changes the parameters of TBS determination by incorporating LDPC code characteristics (code rate, block length) into the calculation. The TBS is determined as a multiple of both 8 and the number of temporary code blocks, with specific formulas applied based on code rate ranges (≤0.25, >0.25 and >8424 bits, ≤8424 bits). This parameter optimization improves transmission efficiency while maintaining manageable complexity through structured calculation rules.
2Loss of substance
If the TBS is optimized to be a multiple of both 8 and the number of temporary code blocks, then the resource allocation is optimized and bit additions are minimized, but the calculation complexity increases
Solution Approach 1:
The patent optimizes TBS by changing it to satisfy two conditions simultaneously: being a multiple of 8 and a multiple of the number of temporary code blocks. Different calculation formulas are applied based on code rate ranges to minimize unnecessary bit additions. This approach reduces resource waste while the structured conditional calculation keeps complexity manageable.
Solution Approach 2:
The patent segments the TBS determination process into different cases based on code rate ranges. For code rate ≤0.25, one formula is used; for code rate >0.25 with information bits >8424, another formula is used; and for code rate >0.25 with information bits ≤8424, a third formula is used. This segmentation allows optimized bit allocation for each scenario while maintaining clear calculation procedures.
3Reliability
If the TBS determination considers varying channel conditions and code rates, then the data reliability improves, but the determination process becomes more complex
Solution Approach 1:
The patent improves data reliability by dynamically adjusting TBS based on channel conditions and code rates. The determination process incorporates LDPC code characteristics and applies different formulas based on code rate ranges and information bit lengths. This adaptive approach enhances reliability by optimizing TBS for specific channel conditions while maintaining structured calculation rules to manage complexity.
Data Source
AI summary
The present disclosure relates to a communication technique that combines, with IoT technology, 5G communication system for supporting a higher data transfer rate than a 4G system, and a system therefor. The present disclosure can be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety related services, etc. on the basis of 5G communication technologies and IoT related technologies. Disclosed, in the present invention, are a method and an apparatus for determining the size of a transport block in a communication or broadcasting system.