Terminal Apparatus Interference Cancellation via Extracted Signal Parameters
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Solution Overview
Problem
The transmission of information on interfering signals to terminal apparatuses by base stations increases control signals, leading to deterioration in throughput and interference challenges in high-density wireless networks.
Innovation Solution
A terminal apparatus and base station apparatus configuration that determines and transmits the number of layers, antenna port numbers, and scrambling identities of signals and interfering signals using downlink control information, allowing for accurate cancellation or suppression of interfering signals without increasing control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base station transmits information on interfering signals to terminal apparatus, then terminal apparatus can cancel or suppress interfering signals, but control signal increases leading to throughput deterioration
Solution Approach 1:
The patent extracts only the essential parameters needed for interference cancellation (number of layers, antenna port numbers, scrambling identities) from the complete interfering signal information, transmitting only these extracted elements to the terminal apparatus. This selective extraction reduces control signal overhead while maintaining the terminal's ability to suppress interference effectively.
Solution Approach 2:
The patent segments the interfering signal information into distinct parameter categories (number of layers, antenna port numbers, scrambling identities), allowing the terminal apparatus to process each segment independently. This segmentation enables efficient interference cancellation using minimal control information, avoiding the need to transmit complete signal descriptions.
2Measurement precision
If base station transmits complete information on interfering signals, then terminal apparatus can accurately cancel interfering signals, but control information overhead increases
Solution Approach 1:
The patent extracts only the critical parameters (number of layers, antenna port numbers, scrambling identities) required for interference cancellation, excluding redundant information. This extraction maintains cancellation accuracy while significantly reducing control information overhead that would otherwise be transmitted.
Solution Approach 2:
The terminal apparatus uses its own received signal parameters in combination with the transmitted interfering signal parameters to perform interference cancellation. This self-service approach allows the terminal to accurately cancel interference using minimal external information, reducing the need for comprehensive base station transmissions.
Data Source
AI summary
A terminal apparatus that communicates with a base station apparatus includes: a higher layer on which NAICS information is configured from the base station apparatus; and a control unit that, in a case where the NAICS information has been configured, determines the number of layers, antenna port numbers, and scrambling identities of a signal addressed to the terminal apparatus and an interfering signal. The terminal apparatus further includes a receiving unit that receives downlink control information, and the control unit determines at least one of the number of layers, antenna port number, and scrambling identity of the interfering signal on the basis of the downlink control information.