Transport Block Size Determination via Average Valid REs
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Solution Overview
Problem
In the context of 5G NR systems, determining an appropriate transport block size (TBS) for data packets becomes challenging when the number of valid resource elements (REs) varies across different transmission occasions, leading to potential performance deterioration due to excessively high or low code rates.
Innovation Solution
A method is introduced to determine the TBS based on a target quantity of valid REs, which can be the average quantity across all transmission occasions or specific occasions, ensuring that the TBS is neither excessively large nor small, by using control information to adjust the time-domain resource length and modulation order, and dropping or modifying transmission occasions as necessary to maintain reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the TBS is determined based on the maximum quantity of valid REs among multiple transmission occasions, then the transmission efficiency is improved, but the code rate becomes excessively high for transmission occasions with fewer valid REs, leading to performance deterioration
Solution Approach 1:
The patent changes the parameter used for TBS determination from a fixed value (maximum valid REs) to a dynamic value (average valid REs across transmission occasions). This allows the system to adapt to varying channel conditions and resource allocations across different transmission occasions, balancing transmission efficiency with code rate performance.
2Reliability
If the TBS is determined based on the minimum quantity of valid REs among multiple transmission occasions, then the code rate remains acceptable for all transmission occasions, but the transmission efficiency decreases due to the excessively conservative TBS
Solution Approach 1:
Instead of using the minimum valid REs as the basis for TBS determination, the patent uses the average valid REs across all transmission occasions. This intermediate value avoids the conservatism of the minimum approach while preventing the excessive code rates that would result from using the maximum value.
3Reliability
If different TBS values are used for different transmission occasions, then each occasion can be optimized independently, but the system complexity increases due to the need to manage multiple TBS values
Solution Approach 1:
The patent merges the TBS determination for multiple transmission occasions into a single unified process by calculating the average valid REs across all occasions. This single average value is then used to determine a single TBS that applies to all transmission occasions, simplifying the system while maintaining optimization.
4Device complexity
If a single TBS value is used for all transmission occasions, then the system complexity is reduced, but the performance deteriorates when the quantity of valid REs varies significantly across occasions
Solution Approach 1:
The patent uses the average quantity of valid REs as a dynamic parameter that reflects the overall resource availability across transmission occasions. This single parameter enables the system to maintain simple TBS management while adapting to varying channel conditions, achieving a balance between complexity and performance.
Data Source
AI summary
This application relates to the field of communication technologies, and discloses a transport block size determining method and an apparatus. The method includes: A terminal device determines, based on control information sent by a network device, K transmission occasions used to transmit a first data packet, where at least two of the K transmission occasions include different quantities of valid REs. Further, the terminal device may determine, based on a target quantity of valid REs, a TBS corresponding to the first data packet, where the target quantity of valid REs may be an average quantity of valid REs of the K transmission occasions, or may be a quantity of valid REs included in a target transmission occasion in the K transmission occasions.