Terminal Feedback Control for Modulation Selection in Radio Systems
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Solution Overview
Problem
Current radio communication systems face challenges in efficiently transmitting feedback for selecting modulation methods on downlink channels, particularly in terms of flexibility and signaling load, especially in high-frequency bands where phase noise is a concern.
Innovation Solution
A terminal and radio communication system that includes a transmission unit and a control unit capable of determining the content of feedback, which explicitly or implicitly indicates a desired modulation scheme, the difference between current and desired modulation schemes, and an index associated with this difference, to facilitate appropriate modulation method selection on downlink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit feedback indicating desired modulation scheme is transmitted, then modulation selection accuracy is improved, but signaling load increases
Solution Approach 1:
The patent applies local quality by providing different feedback granularity options: full explicit modulation scheme indication for high accuracy requirements, or differential feedback for cases where less signaling is acceptable. This allows the system to adapt the feedback detail level to specific channel conditions and service requirements.
Solution Approach 2:
The patent enables dynamic feedback mechanisms where the terminal can switch between different feedback types (explicit modulation scheme, differential feedback, or index-based feedback) based on current channel conditions, service requirements, and base station capabilities, optimizing the balance between accuracy and signaling overhead in real-time.
2Adaptability or versatility
If flexible feedback content is provided, then modulation scheme adaptability is improved, but feedback complexity increases
Solution Approach 1:
The patent segments the feedback information into multiple optional components: desired modulation scheme indication, differential feedback relative to current scheme, and index-based feedback. This segmentation allows the system to select only the necessary feedback elements based on specific requirements, reducing overall complexity while maintaining adaptability.
Solution Approach 2:
The patent creates a universal feedback framework that can accommodate multiple feedback types (explicit, differential, index-based) within a single standardized interface. This multi-functionality allows the same feedback mechanism to serve different adaptation needs without requiring separate complex systems for each feedback type.
3Productivity
If differential feedback is used to reduce signaling load, then information transmission efficiency is improved, but feedback interpretation complexity increases
Solution Approach 1:
The patent introduces the base station as an intermediary that maintains knowledge of the current modulation scheme and performs the interpretation of differential feedback. Instead of requiring the terminal to handle complex interpretation, the base station uses its contextual knowledge to translate the differential feedback into the actual desired modulation scheme, simplifying the terminal's processing requirements.
Data Source
AI summary
A terminal comprising: a transmission unit that transmits a feedback to be used in selecting a modulation method used on a downlink channel; and a control unit that determines a content of the feedback; wherein the content of the feedback includes at least one of an information element that explicitly or implicitly indicates a desired modulation scheme, an information element that explicitly or implicitly indicates a difference between a current modulation scheme and a desired modulation scheme, and an information element that indicates an index that is explicitly or implicitly associated with a difference between a current modulation scheme and a desired modulation scheme.