Modulation and Coding Scheme Prediction for Retransmission
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in retransmitting signals due to inadequate modulation and coding scheme determination based on changing communication quality, leading to wasteful use of radio resources and increased device load.
Innovation Solution
A base station device determines a modulation and coding scheme based on predicted communication quality at both initial transmission and retransmission times, allowing for adaptive adjustment of the scheme to match the current communication environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses the same modulation and coding scheme for retransmission as for initial transmission, then the device complexity is reduced, but the reliability of signal reception deteriorates when communication quality has degraded
Solution Approach 1:
The base station device performs preliminary determination of the modulation and coding scheme for retransmission by predicting future communication quality before the retransmission actually occurs. This allows the system to proactively select an appropriate scheme that accounts for anticipated channel conditions, rather than reactively using the same scheme as the initial transmission.
Solution Approach 2:
The modulation and coding scheme is made dynamic by allowing it to change based on predicted communication quality. The base station device adjusts the scheme according to time-varying channel conditions, transitioning from a static approach (same scheme for retransmission) to a dynamic approach (adapted scheme based on predictions).
2Device complexity
If the modulation class is determined based on past communication environment information stored in the base station device, then the device complexity is reduced, but the adaptability to current communication environment deteriorates
Solution Approach 1:
Instead of relying solely on past stored information, the base station device performs preliminary prediction of future communication quality using current channel state information and predicted future conditions. This allows the system to proactively adapt to anticipated channel variations rather than reactively responding to historical data.
Solution Approach 2:
The system incorporates feedback mechanisms where the base station device uses current channel state information and predicted future quality to dynamically adjust the modulation and coding scheme. This creates a closed-loop system that continuously adapts to changing communication conditions rather than relying on open-loop historical data.
Data Source
AI summary
[Problem] According to conventional techniques, a modulation class is determined on the basis of past communication environment information stored at a base station, and the modulation class cannot be determined with consideration of a communication environment in which a signal is retransmitted. Thus, with the conventional techniques, a modulation and coding scheme cannot be determined with consideration of the communication environment in which the signal is retransmitted.[Solution] An embodiment of this communication system has a control unit that determines a first modulation and coding scheme to be applied to a signal on the basis of information about predicted first communication quality when a signal is transmitted at a first timing and information about predicted second communication quality when the signal is retransmitted at a second timing.