Transport Block Size Selection Using Code Rate Thresholds
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Solution Overview
Problem
In wireless communication systems, determining the optimal transport block size (TBS) for efficient data transmission 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 identifying the TBS by receiving control information from a base station, determining the number of temporary information bits, and decoding downlink data based on the identified TBS, which is a multiple of both 8 and the number of temporary code blocks, using specific criteria for code rate thresholds to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transport block size is determined without considering code rate thresholds and LDPC code characteristics, then the determination process is simple, but resource allocation efficiency deteriorates and unnecessary bits are added
Solution Approach 1:
The patent changes the parameter of TBS determination by introducing code rate thresholds (0.25, 0.5, 0.75) as key parameters. Based on the code rate value, different determination methods are selected: for code rate ≤ 0.25, TBS is determined based on transport block size indices; for code rate > 0.25, TBS is determined based on the number of information bits. This parameter-based differentiation improves resource allocation efficiency while maintaining manageable complexity through structured decision logic.
2Productivity
If the TBS is determined as a multiple of 8 and temporary code blocks without optimization, then decoding is straightforward, but unnecessary bits are added reducing transmission efficiency
Solution Approach 1:
The patent extracts and removes unnecessary bits from the TBS by determining TBS as a multiple of the product of 8 and the number of temporary code blocks (CBs). This extraction principle eliminates redundant padding bits that would otherwise be added to align with standard block sizes, thereby improving data transmission efficiency by reducing the total number of transmitted bits while maintaining decoding simplicity through the structured multiple relationship.
3Productivity
If different determination methods are used for different code rates, then resource allocation is optimized, but the determination process becomes more complex
Solution Approach 1:
The patent segments the TBS determination process into distinct segments based on code rate thresholds. For code rate ≤ 0.25, one determination method is used (based on transport block size indices); for code rate > 0.25, another method is used (based on information bits and CB multiples). This segmentation improves resource allocation efficiency by tailoring the determination method to the specific code rate regime, while the clear threshold-based segmentation maintains operational ease through structured, predictable decision boundaries.
Data Source
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AI summary
The present disclosure relates to a method and an apparatus of a terminal for receiving, from a base station, control information for scheduling downlink data; identifying a number of temporary information bits based on a modulation order and a code rate of the downlink data, the modulation order and the code rate being associated with the control information; identifying a transport block size, TBS, based on the code rate and the number of temporary information bits; and decoding the downlink data, based on the identified TBS.