MTC Terminal CSI Measurement Across Narrow Bands
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Solution Overview
Problem
Low-cost Machine-Type Communication (MTC) terminals in cellular systems face challenges in efficiently measuring and reporting Channel State Information (CSI) across multiple narrow bands, due to limited band usage and increased power consumption from periodic measurements.
Innovation Solution
Implementing a user terminal with a receiving section for CSI measurement information, a measurement section to measure CSI in multiple narrow bands, and a transmission section to report these measurements, triggered by downlink control signals, allowing for dynamic CSI measurement and reporting based on CSI subframe sets, start/stop control, and CSI measurement requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic CSI measurements are performed in multiple narrow bands, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic CSI measurements only in specific subframes designated as CSI subframes, rather than continuous measurements. The terminal measures CSI in multiple narrow bands periodically according to a configured measurement cycle, and reports CSI in periodic CSI reports. This periodic measurement approach maintains measurement precision across multiple bands while significantly reducing power consumption compared to continuous measurements.
Solution Approach 2:
The patent divides the system band into multiple narrow bands and configures different CSI measurement subframe sets for each narrow band. Each narrow band has its own measurement timing and reporting schedule, allowing the terminal to measure and report CSI for different bands at different times. This segmentation enables efficient resource utilization and power management while maintaining comprehensive CSI coverage across all narrow bands.
2Loss of information
If CSI measurements are performed in multiple narrow bands, then information completeness is improved, but device complexity increases
Solution Approach 1:
The patent segments CSI measurement and reporting into separate periodic processes for different narrow bands. Each narrow band is assigned specific measurement subframes and reporting timing, allowing the terminal to handle multiple bands systematically. The base station configures and manages multiple CSI subframe sets, each associated with specific narrow bands, reducing terminal processing complexity while ensuring complete CSI information is collected across all bands.
Solution Approach 2:
The patent implements dynamic CSI measurement and reporting where the terminal adapts its measurement and reporting behavior based on configured parameters and current conditions. The base station dynamically configures measurement subframe sets, reporting timing, and band assignments, allowing flexible resource allocation. This dynamic approach enables complete CSI collection while managing terminal complexity through adaptive rather than static processing requirements.
Data Source
AI summary
The present invention is designed to measure and/or report CSI (Channel State Information) of a plurality of narrow bands, even when the band to use is limited to a partial narrow band in a system band. According to one aspect of the present invention, a user terminal, in which the band to use is limited to a partial narrow band in a system band, has a receiving section that receives information related to CSI (Channel State Information) measurement in a narrow band, a measurement section that measures CSIs in a plurality of narrow bands based on the information related to CSI measurement, and a transmission section that reports the measured CSIs.


