Transport Block Size Calculation for LDPC Code Rate Adaptation
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Solution Overview
Problem
In wireless communication systems, determining the optimal transport block size (TBS) for efficient data transmission using low-density parity-check (LDPC) codes is challenging due to variations in code rates and channel conditions, leading to inefficiencies in resource allocation and data decoding.
Innovation Solution
A method and apparatus for determining TBS by a terminal and base station, where the TBS is calculated based on received control information, temporary information bits, and code rate, involving the identification of temporary code blocks and subtracting a fixed value from multiples of 8 to optimize resource allocation and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional TBS determination methods are used, then data transmission can proceed, but resource allocation efficiency deteriorates due to unnecessary bits being added
Solution Approach 1:
The patent changes the TBS calculation parameters by introducing code rate-based segmentation. The TBS is determined by dividing temporary information bits into code blocks based on code rate thresholds (≤1/4 or >1/4), then calculating TBS as a multiple of 8 minus 24. This parameter change optimizes resource allocation by adapting the TBS calculation to specific code rate conditions, eliminating unnecessary bits while maintaining transmission efficiency.
2Reliability
If TBS is determined without considering code rate variations, then calculation complexity is reduced, but decoding reliability deteriorates
Solution Approach 1:
The patent segments the TBS determination process into distinct code rate conditions. It divides the calculation into two segments: one for code rates ≤1/4 and another for code rates >1/4. Each segment has specific rules for determining the number of code blocks and calculating TBS. This segmentation improves decoding reliability by optimizing for specific code rate ranges while keeping each segment's calculation logic relatively simple.
Solution Approach 2:
The patent introduces dynamic adaptation in TBS calculation by making the calculation method dependent on the code rate condition. The system dynamically selects different calculation approaches based on whether the code rate is ≤1/4 or >1/4, allowing the TBS determination to adapt to varying channel conditions and code rate requirements, thereby improving reliability without requiring a completely complex system.
3Adaptability or versatility
If fixed TBS calculation method is used, then implementation simplicity is maintained, but adaptability to different code rates deteriorates
Solution Approach 1:
The patent implements dynamic adaptability by making the TBS calculation method dependent on code rate conditions. The system automatically adjusts its calculation approach based on whether the code rate is ≤1/4 or >1/4, enabling it to adapt to different code rates and channel conditions. This dynamic approach enhances versatility while maintaining relatively simple implementation within each code rate category.
Solution Approach 2:
The patent changes key parameters in the TBS calculation based on code rate conditions. It modifies the number of code blocks and the TBS formula application depending on the code rate threshold. This parameter-based adaptation allows the system to handle different code rates effectively without requiring a completely different calculation framework, balancing adaptability with implementation simplicity.
Data Source
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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.