Transport Block Size Alignment for Consistent UE-gNB Decoding
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Solution Overview
Problem
In current communication systems, the transport block size (TBS) determined by user equipment (UE) may differ from that understood by the base station (gNB), leading to data transmission failures due to differing interpretations of resource parameters and base graphs of low-density parity check (LDPC) in physical channels.
Innovation Solution
A method for determining TBS based on parameters and signaling to ensure consistency between UE and gNB, involving steps to compute resource elements, intermediate values, and quantization to determine TBS, with optional rounding or floating-point precision adjustments based on UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different combinations of rate and TBS are used, then data transmission flexibility is improved, but transmission reliability deteriorates due to potential TBS determination differences between UE and gNB
Solution Approach 1:
The patent changes the parameter representation from floating-point to integer by introducing a scaled version of the intermediate value (N_info') multiplied by a scaling factor (e.g., 2^14). This parameter transformation ensures that both UE and gNB determine the same TBS value while maintaining the ability to support different rate and TBS combinations for flexible data transmission.
2Measurement precision
If floating-point precision is used for intermediate value calculation, then TBS determination accuracy is improved, but device complexity increases due to different UE implementations
Solution Approach 1:
The patent transforms the intermediate value from a floating-point number to an integer by applying a scaling factor. Instead of using floating-point arithmetic which varies across different UE implementations, the system uses integer arithmetic with a predefined scaling factor (e.g., 2^14), thereby reducing device complexity while maintaining sufficient precision for TBS determination.
Solution Approach 2:
The patent performs preliminary scaling of the intermediate value N_info by a predetermined factor before further processing. This preliminary action converts the floating-point value to an integer representation early in the calculation process, ensuring consistency between UE and gNB and avoiding subsequent floating-point operations that would increase device complexity.
Data Source
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AI summary
Method, systems and devices for determining a transport block size (TBS) are disclosed. The method comprises determining the TBS based on a parameter or a signaling associated with an event of determining an intermediate value of a TBS determination procedure, wherein the parameter or a signaling is available for a wireless terminal supporting a release version, wherein the intermediate value is determined based on a plurality of resource parameters, wherein the plurality of resource parameters comprises at least one of the total number of resource elements allocated to the wireless terminal, a rate, a modulation order, and the number of layers.