Terminal Apparatus NAICS Control via Downlink Format Detection
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Solution Overview
Problem
In Network-Assisted Interference Cancellation and Suppression (NAICS) systems, determining whether to cancel or suppress interference signals efficiently is challenging due to increased control information transmission, which degrades throughput and reception performance.
Innovation Solution
The terminal apparatus employs a method to determine whether to cancel or suppress interference signals by using different downlink control information formats, allowing it to reduce control information without explicit signaling, thereby optimizing interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits control information indicating whether interference cancellation or suppression is needed, then the terminal can efficiently perform interference cancellation or suppression, but the amount of control information increases, decreasing efficiency and degrading throughput
Solution Approach 1:
The terminal apparatus autonomously determines whether interference cancellation or suppression is needed by detecting interference signals and evaluating reception quality, without requiring explicit control information from the base station. This self-service approach eliminates the need for additional control signaling while maintaining effective interference management
Solution Approach 2:
The terminal uses feedback from its own reception quality measurements and interference signal detection to autonomously decide on interference cancellation or suppression operations, creating a closed-loop system that adapts to channel conditions without additional control overhead
2Productivity
If the terminal apparatus autonomously determines interference cancellation needs, then control information amount is reduced, but the terminal complexity increases
Solution Approach 1:
The terminal performs partial interference cancellation or suppression only when interference signals are detected and reception quality deteriorates, rather than continuously processing all signals. This selective approach reduces computational complexity while maintaining effectiveness when needed
Solution Approach 2:
The terminal changes its processing parameters dynamically based on detected interference conditions, switching between different reception modes (e.g., regular reception, interference cancellation, or suppression) based on channel state, which optimizes the balance between complexity and performance
Data Source
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AI summary
Degradation in reception performance due to interference is reduced while suppressing control information from increasing. A higher layer that determines whether or not to apply NAICS and a reception unit that receives Downlink Control Information are included. In a case where, with the higher layer, an indication that the NAICS has to be applied is provided, if a first downlink control information format is received, signal detection in compliance with the NAICS is performed, and, in the case where, with the higher layer, the indication that the NAICS has to be applied is provided, if a second downlink control information format is received, signal detection in compliance with a linear scheme is performed. The first downlink control information format is constituted as at least one downlink control information format that is allocated only to a UE-specific search space.