Transmission Block Size Determination in LTE-A Subframes
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Solution Overview
Problem
In LTE-A systems, the introduction of new carrier types and heterogeneous networks leads to inter-cell interference, particularly from aggressor cells, which reduces the reliability of control and data domain resources, affecting spectrum efficiency and overall network performance.
Innovation Solution
A method and base station for determining the size of transmission blocks in a subframe using a conversion relationship between physical resource block allocation and transmission block size index, which reuses the existing TB size table to improve downlink spectrum efficiency by adjusting parameters A and B within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new carrier types (carrier segment and extension carrier) are introduced to increase transmission capability, then bandwidth and transmission capability are improved, but inter-cell interference and reliability of control/data domain resources deteriorate
Solution Approach 1:
The patent changes the parameter of transmission block size determination by introducing a conversion relationship between physical resource block allocation and transmission block size index. This allows dynamic adjustment of transmission block size based on actual resource allocation, improving reliability while maintaining high transmission capability in new carrier types
Solution Approach 2:
The patent makes the transmission block size determination dynamic by establishing a conversion relationship that adapts to different resource allocation scenarios. This dynamic approach allows the system to optimize transmission block size in real-time based on actual resource usage, thereby improving reliability without sacrificing productivity
2Adaptability or versatility
If CRS is sent in each subframe to guarantee backward compatibility, then backward compatibility is maintained, but inter-cell interference to victim UEs increases
Solution Approach 1:
The patent addresses interference by changing the parameter of transmission block size determination through a conversion relationship. This allows the system to compensate for interference effects by optimizing transmission block size based on actual resource allocation, thereby maintaining backward compatibility while mitigating harmful interference effects
3Productivity
If resource elements strongly interfered by aggressor cell CRS are used for data transmission, then spectrum efficiency is improved, but demodulation and decoding reliability deteriorates
Solution Approach 1:
The patent changes the transmission block size parameter based on a conversion relationship with physical resource block allocation. This allows the system to optimize transmission block size to account for interfered resource elements, thereby maintaining spectrum efficiency while improving demodulation and decoding reliability
Solution Approach 2:
The patent implements a feedback mechanism through the conversion relationship that considers actual resource allocation and interference conditions. This feedback loop allows the system to adjust transmission block size dynamically, ensuring reliable demodulation and decoding while maintaining high spectrum efficiency
Data Source
Figure 1~2
AI summary
A method and a base station for determining a size of transmission blocks in a subframe. The method comprises: acquiring a physical resource block allocation number NPRB and a transmission block size index I'TBS; determining a conversion relationship, and converting N'PRB and I'TBS, according to a conversion relationship, respectively into NPRB and ITBS used in existing calculation for the size of a transmission blocks; and according to NPRB and ITBS, calculating the size of the transmission blocks.