Transport Block Size Determination Function for 5G New Radio
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Solution Overview
Problem
The existing table-based approach for determining transport block size (TBS) in 5G new radio (NR) is inefficient due to large memory requirements and does not accurately model the relationship between TBS and the number of physical resource blocks (PRBs), leading to suboptimal coding gain utilization.
Innovation Solution
A general function f(NPRB, ν, Qm, R) is introduced to determine TBS, which is a non-linear mapping of PRBs, layers, modulation bits, and coding rate, allowing for adaptive TBS determination and improved coding gain utilization through simulation-approximated formulas or mapping tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If table-based TBS determination is used for NR, then TBS can be determined for different PRBs, but memory requirements become very large due to the number of PRBs being much higher than LTE
Solution Approach 1:
The patent extracts only the essential parameters needed for TBS determination (NPRB, ν, Qm, R) and removes the dependency on large pre-computed tables. Instead of storing complete TBS tables for all possible PRB configurations, the system extracts and stores only the core functional relationships in a compact form, significantly reducing memory requirements while maintaining adaptability.
Solution Approach 2:
The patent changes the approach from static table lookup to dynamic parameter-based calculation. By expressing TBS as a function f(NPRB, ν, Qm, R) rather than relying on fixed tables, the system can adapt to different PRB values and channel conditions through parameter changes without requiring proportional increases in memory storage.
2Device complexity
If linear mapping with NPRB is used to reduce complexity, then memory requirements are reduced, but coding gain is not optimized because normalized TBS should increase with NPRB
Solution Approach 1:
The patent introduces dynamic behavior into the TBS determination by making the function f() adaptive to the input parameters. Rather than using a static linear mapping, the function can dynamically adjust the relationship between NPRB and TBS based on the specific values of ν, Qm, and R, allowing the normalized TBS to increase with NPRB when appropriate to capture coding gain while keeping the system relatively simple.
Solution Approach 2:
The patent uses parameter changes to transition from fixed linear mapping to adaptive mapping. By allowing the functional relationship to change based on the values of its parameters (particularly NPRB), the system can optimize coding gain utilization without requiring complex table structures, achieving a balance between simplicity and performance.
3Measurement precision
If large TBS tables are stored at base station or UE, then accurate TBS can be determined for all PRB values, but storage requirements increase significantly
Solution Approach 1:
The patent creates a simplified copy or representation of the TBS determination logic through the function f(NPRB, ν, Qm, R). Instead of storing complete detailed tables, the system uses a compact functional representation that captures the essential relationships, providing accurate TBS determination with minimal storage requirements.
Data Source
AI summary
A method performed by a wireless transmitter determining a transport block size (TBS) is provided. The method includes determining a TBS using a general function of a number of physical resource blocks (PRBs) to be granted (N_PRB), a number of resource elements (REs) per PRB (N_RE{circumflex over ( )}(DL,PRB)), a number of layers per transport block (ν), a number of bits per modulation (Q_m), and a coding rate determined by a modulation coding scheme (MCS) (R), allocating a transport block of the determined TBS and transmitting the transport block to a wireless receiver. Apparatuses for implementing the method are also provide.