TBS Determination with Multiple LDPC Base Graphs
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Solution Overview
Problem
The existing Transport Block Size (TBS) determination scheme in LTE is inadequate for flexible slot structures and resource allocations in 5G networks, leading to sub-optimal code rates and reduced spectral efficiency due to mismatched radio resource assumptions.
Innovation Solution
A method for determining TBS using a formula that ensures equal-sized code blocks across different Low Density Parity Check (LDPC) base graphs, allowing for flexible code block segmentation and transmission according to the determined TBS, which is independent of the base graph used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LTE TBS determination scheme is used, then implementation is simple, but spectral efficiency deteriorates due to mismatched radio resource assumptions in 5G flexible slot structures
Solution Approach 1:
The patent changes the fundamental parameters of TBS determination from LTE's table-based approach to a formula-based approach specifically designed for 5G's flexible slot structures. The formula incorporates 5G-specific parameters such as variable slot lengths, mini-slot configurations, and flexible resource block allocations, thereby resolving the spectral efficiency deterioration while maintaining computational simplicity.
Solution Approach 2:
The patent introduces dynamic TBS determination that adapts to varying slot structures and resource allocations in real-time. Unlike the static LTE table approach, the formula dynamically adjusts TBS based on current transmission conditions including slot format, resource block assignment, and code rate, thus improving spectral efficiency in flexible 5G networks.
2Adaptability or versatility
If code block segmentation is performed with different LDPC base graphs, then coding flexibility is improved, but code block size equality deteriorates
Solution Approach 1:
The patent applies local quality by allowing different segments of the transport block to be processed with different LDPC base graphs based on their specific requirements. Each code block can be optimally encoded with the most suitable base graph while maintaining overall size equality through the formula-based TBS determination that accounts for segmentation requirements.
Solution Approach 2:
The patent explicitly segments the transport block into multiple code blocks for parallel processing with different LDPC base graphs. The TBS formula is designed to ensure that after segmentation, all code blocks maintain equal or near-equal sizes, thereby preserving manufacturing precision while enabling coding flexibility through multi-base-graph processing.
3Productivity
If TBS is optimized for specific slot structures, then spectral efficiency is improved, but adaptability to different slot formats deteriorates
Solution Approach 1:
The patent creates a universal TBS determination formula that serves multiple slot formats and transmission configurations. The formula incorporates parameters that can accommodate full slots, mini-slots, and various resource block assignments, making it multi-functional and adaptable to different 5G slot structures while maintaining optimal spectral efficiency for each configuration.
Solution Approach 2:
The patent implements dynamic TBS optimization that automatically adapts to different slot formats through the formula's parameters. Rather than having separate optimized tables for each slot type, the formula dynamically adjusts based on the actual slot configuration, resource allocation, and transmission conditions, thereby achieving both spectral efficiency and adaptability simultaneously.
Data Source
AI summary
Systems and methods are disclosed herein for determining and using a Transport Block Size (TBS) when two or more Low Density Parity Check (LDPC) base graphs can be used for LPDC coding. In some embodiments, a method comprises determining a Transport Block Size (TBS) for a transport block communicated between a network node and a wireless device via a physical channel transmission using a formula such that code block segmentation of the transport block results in equal sized code blocks independent of which of two different LDPC base graphs is used for the code block segmentation. The method further comprises transmitting or receiving the transport block according to the determined TBS.