User Terminal Transport Block Size Control for Subframe Overhead Variation
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Solution Overview
Problem
In LTE systems, the variation of overhead within a subframe can lead to deviations in the calculated coding rate, affecting the quality of downlink and uplink signals, resulting in excessive or insufficient throughput.
Innovation Solution
A user terminal with a transmitting/receiving section and control section adjusts transport block sizes based on subframe overhead and desired coding rate to maintain consistent coding rates across subframes, reducing the impact of overhead variation on signal throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TBS is determined using the same method as in existing LTE systems, then the device complexity is reduced, but the coding rate deviates from the desired coding rate and the throughput is affected
Solution Approach 1:
The patent changes the parameter used for TBS determination from a fixed method to a dynamic method that considers overhead variations. Specifically, the control section determines TBS based on the relationship between overhead and coding rate, adjusting the TBS to compensate for overhead changes in subframes, thereby maintaining the desired coding rate and improving throughput.
2Ease of operation
If the TBS is determined without considering overhead variation, then the ease of operation is improved, but the coding rate accuracy deteriorates
Solution Approach 1:
The patent introduces a feedback mechanism where the control section monitors the overhead in each subframe and adjusts the TBS accordingly. The control section determines the TBS based on the detected overhead, creating a closed-loop system that maintains coding rate accuracy despite overhead variations, while keeping the operation relatively simple through automated adjustment.
3Measurement precision
If the TBS is adjusted based on overhead variation, then the coding rate accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by having the control section determine the TBS in advance based on the relationship between overhead and coding rate. The control section calculates the appropriate TBS adjustment before transmission, ensuring the desired coding rate is achieved without requiring complex real-time adjustments during transmission.
Data Source
AI summary
The present invention is designed to reduce the impact which the variation of the amount of overhead within a subframe has upon the throughput of data channels. A user terminal, according to the present invention, has a transmitting/receiving section that receives a downlink (DL) signal and/or transmits an uplink (UL) signal in a subframe, and a control section that controls transport block sizes (TBSs) of the DL signal and/or the UL signal. The user terminal controls the TBSs based on overhead in the subframe or a desired coding rate.