Transport Block Size Determination for New Carrier Types
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Solution Overview
Problem
The existing LTE Rel-8/9/10 TBS lookup tables are not adaptable to the dynamic variations in resource elements per PRB pair, leading to suboptimal data rate performance in new carrier types (NCT) with reduced or eliminated legacy control regions and CRS overhead, which limits spectral efficiency and peak data rates.
Innovation Solution
The proposed solution involves using an adjustment factor to determine a reference number of resource blocks for TBS lookup, allowing for dynamic scaling based on available resource elements, and potentially redesigning the TBS table to better match NCT configurations, ensuring peak data rates are maintained across different bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing LTE Rel-8/9/10 TBS lookup tables are used, then the system maintains backward compatibility with legacy configurations, but the spectral efficiency and peak data rates deteriorate in new carrier types with reduced control regions and CRS overhead
Solution Approach 1:
The patent applies dynamics by making the TBS determination adaptive to different carrier configurations. The system dynamically selects between legacy TBS tables and enhanced TBS tables based on the carrier type (legacy or NCT), allowing the TBS lookup mechanism to adapt its behavior rather than being fixed. This resolves the contradiction by enabling the system to maintain legacy compatibility when needed while optimizing for NCT configurations when applicable.
Solution Approach 2:
The patent changes the parameters used in TBS determination by introducing configuration-dependent parameters such as the number of resource elements per PRB pair, which varies based on the carrier configuration. The enhanced TBS tables incorporate these configuration-specific parameters, allowing the system to optimize TBS selection for NCT configurations with reduced overhead while maintaining backward compatibility for legacy configurations.
2Productivity
If the existing LTE Rel-8/9/10 TBS lookup tables are used, then the system maintains simplicity in TBS determination, but the peak data rates are limited in configurations with reduced control regions and CRS overhead
Solution Approach 1:
The patent segments the TBS determination process by creating separate TBS tables for different carrier configurations (legacy versus NCT). Instead of using a single universal TBS table, the system divides the lookup tables into configuration-specific segments, allowing each table to be optimized for its intended carrier type. This resolves the contradiction by enabling peak data rate optimization for NCT configurations while maintaining a relatively simple legacy TBS table for backward compatibility.
3Ease of operation
If the TBS lookup is based on reference configuration assumptions, then the calculation process remains straightforward, but the data rate performance becomes suboptimal when actual configurations differ from reference
Solution Approach 1:
The patent applies local quality by making the TBS determination process configuration-specific. Different local conditions (carrier configurations) use different TBS tables optimized for those specific conditions. The enhanced TBS tables incorporate local configuration parameters such as the actual number of resource elements per PRB pair, allowing the system to maintain calculation simplicity while achieving optimal data rate performance for each specific configuration type.
Data Source
AI summary
User equipment determines a transport block size column indicator representative of a number of resource blocks based on a number of allocated resource blocks, an adjustment factor, and a limiting factor. The transport block size column indicator is determined by applying the adjustment factor to the number of allocated resource blocks and comparing a result of applying the adjustment factor to the number of allocated resource blocks to the limiting factor. The transport block size column indicator is selected as either the result or the limiting factor as the based on the comparison.