Radio Terminal Transmission Rate Prediction with Early Termination
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Solution Overview
Problem
Conventional transmission rate prediction methods fail to accurately calculate predictive transmission rates when the maximum slot number is dynamically changed according to reception quality in radio terminals, leading to errors due to the lack of consideration for early termination in data decoding.
Innovation Solution
A radio terminal with a decoding unit, storage unit, and calculation unit that associates corrected transmission rates with index values of reception quality, calculates the probability of successful decoding, and uses this information to predict the reception quality and subsequently the predictive transmission rate, taking into account the influence of early termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum slot number is dynamically changed according to reception quality, then transmission efficiency is improved, but prediction accuracy of transmission rate deteriorates
Solution Approach 1:
The patent pre-calculates and stores corrected transmission rates for various slot numbers and reception quality combinations before actual transmission occurs. This preliminary preparation allows the system to quickly retrieve accurate prediction values without real-time calculation delays, resolving the contradiction between dynamic adaptation and prediction accuracy.
Solution Approach 2:
The patent introduces corrected transmission rates that adjust the defined transmission rate based on the actual number of slots used and reception quality. By changing the parameter from fixed defined transmission rate to variable corrected transmission rate, the system accurately reflects early termination effects while maintaining dynamic slot allocation for efficiency.
2Measurement precision
If early termination in data decoding is considered, then prediction accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent pre-calculates corrected transmission rates for all possible combinations of slot numbers and reception quality values, storing them in lookup tables. This eliminates the need for complex real-time calculations during actual operation, as the system only needs to retrieve pre-computed values based on current conditions.
Solution Approach 2:
The patent creates a simplified model by copying and storing transmission rate information in advance for various scenarios. Instead of performing complex probabilistic calculations during real-time operation, the system uses pre-copied corrected transmission rate values that already incorporate early termination effects.
3Productivity
If all slots are used for transmission, then defined transmission rate is achieved, but actual transmission rate decreases due to early termination
Solution Approach 1:
The patent changes the transmission rate parameter from the fixed defined transmission rate to a variable corrected transmission rate that accounts for the actual number of slots used. This parameter change allows the system to accurately represent the actual transmission rate while maintaining the benefits of dynamic slot allocation.
Solution Approach 2:
The patent incorporates feedback about actual decoding success and slot utilization into the transmission rate calculation. By using corrected transmission rates that reflect actual early termination occurrences, the system adjusts future transmissions to optimize both efficiency and accuracy.
Data Source
AI summary
In a radio communication system employing HARQ scheme wherein the maximum number of slots is changed, a radio terminal (1) which calculates a predictive transmission rate being the predictive value of a downlink transmission rate at a future time after the receiving time of a downlink radio signal is provided with a storage unit (15A) which stores in association with a DRC a corrected transmission rate obtained by causing a defined transmission rate being a downlink transmission rate in the case of using all the maximum number of slots to reflect the probability of succeeding in decoding data using only some of the slots, and a calculation unit (142) which predicts the reception quality at the future time on the basis of the reception quality before the receiving time, obtains from the storage unit (15A) the corrected transmission rate associated with the DRC corresponding to the predicted reception quality, and calculates the predictive transmission rate from the obtained corrected transmission rate.