User Terminal TBS Correction for Constant Coding Rate
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Solution Overview
Problem
In existing LTE systems, the transport block size (TBS) for downlink (DL) and uplink (UL) signals is uniquely determined based on the modulation scheme and the number of resource blocks, leading to varying coding rates across different transmission time intervals (TTIs) with different numbers of symbols, which can result in excessive or insufficient received quality and impact data channel throughput.
Innovation Solution
The proposed solution involves a method to correct the TBS based on the number of symbols in each TTI, ensuring that the coding rate remains substantially constant across different TTIs. This is achieved by using a TBS table to select or correct the TBS, taking into account the number of symbols in each TTI, thereby reducing the impact of varying coding rates on data channel throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the TBS is uniquely determined based on the modulation scheme and the number of resource blocks in existing LTE systems, then the system complexity is reduced and ease of operation is improved, but the coding rate varies significantly across TTIs with different numbers of symbols, causing received quality to become excessive or insufficient and impacting data channel throughput
Solution Approach 1:
The patent modifies the TBS determination process by introducing the number of symbols in each TTI as an additional parameter. Instead of uniquely determining TBS based only on modulation scheme and resource blocks, the system now selects TBS from a table using multiple parameters including the number of symbols, thereby adapting the coding rate to match the actual TTI duration and maintaining consistent received quality across different TTI lengths
Solution Approach 2:
The patent implements dynamic TBS selection that adapts to varying TTI configurations. By making the TBS determination dependent on the actual number of symbols in each TTI, the system dynamically adjusts the transport block size to maintain appropriate coding rates regardless of whether the TTI is shortened or extended, thus preserving data channel throughput under varying transmission conditions
2Productivity
If the TBS is corrected based on the number of symbols in each TTI to maintain constant coding rate, then the data channel throughput is maintained, but the device complexity increases due to the need for TBS table selection and correction mechanisms
Solution Approach 1:
The patent employs pre-computed TBS tables that contain correction values for different TTI configurations. Instead of performing complex real-time calculations, the system selects the appropriate TBS from pre-prepared tables based on the number of symbols, thereby maintaining data channel throughput while reducing the computational complexity during actual transmission operations
Solution Approach 2:
The patent introduces TBS tables as an intermediary mechanism between the modulation scheme/resource block determination and the actual TBS selection. These tables serve as a lookup structure that simplifies the relationship between multiple parameters and the final TBS value, making the system easier to implement while maintaining accurate coding rate adjustment across different TTI lengths
Data Source
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AI summary
The present invention is designed to reduce the impact of communication using TTIs with different numbers of symbols (or different numbers of REs) on the throughput of data channels. A transmitting/receiving section that transmits and receives signals using a plurality of transmission time intervals (TTIs) with different numbers of symbols, and a control section that controls the transmission and receipt of the signals by applying a predetermined transport block size (TBS) in each TTI are provided, where the predetermined TBS in each TTI is controlled according to the number of symbols in each TTI or a target coding rate that is configured in advance.