CSI Measurement Resource Units in Communication Networks
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Solution Overview
Problem
Current CSI measurement techniques in communication networks face challenges in accurately measuring interference levels, especially at low loads, due to overestimation by Cell-specific Reference Signals (CRS) and averaging across subframes, which affects CoMP and TDD systems, leading to inefficient resource allocation and increased measurement overhead.
Innovation Solution
The method involves determining a set of measurement resource units (MRUs) shared by a group of cells, configuring MRUs based on the number of cells and MRUs for transmission and measurement, and selecting subsets for transmission and measurement to minimize concurrent transmissions and improve estimation accuracy, using a Balanced Incomplete Block Design (BIBD) theory for scalable and uniform CSI estimation across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference level is measured using Cell-specific Reference Signals (CRS), then interference measurement can be performed, but at low loads the measurement overestimates the interference level
Solution Approach 1:
The patent extracts the interference measurement function from CRS and creates a separate CSI-IM resource structure. This allows interference to be measured independently from reference signal transmissions, eliminating the overestimation problem that occurs when CRS transmissions dominate the measurement at low loads.
Solution Approach 2:
The patent introduces CSI-IM resources as an intermediary measurement mechanism. These dedicated interference measurement resources allow the system to measure interference without the contamination from CRS transmissions, providing accurate interference levels even when actual interference is low.
2Stability of the object's composition
If interference measurement averages across multiple subframes, then measurement stability improves, but uncertainty on how interference is measured increases
Solution Approach 1:
The patent implements periodic CSI-IM resources that are configured at specific intervals. This periodic structure provides stable, predictable measurement opportunities while maintaining precise interference measurement by using dedicated resources rather than averaging contaminated CRS measurements across subframes.
3Productivity
If more MRUs are allocated for transmission, then transmission capacity increases, but the number of concurrent transmissions increases causing measurement interference
Solution Approach 1:
The patent segments the MRU configuration into dedicated transmission resources and dedicated measurement resources (CSI-IM). This segmentation allows transmission capacity to be increased on transmission resources while measurement accuracy is preserved on separate measurement resources that are specifically designed to avoid transmission interference.
4Area of stationary object
If CRS transmissions are used in neighboring cells, then reference signal coverage is maintained, but interference measurement is dominated by CRS transmissions leading to overestimation
Solution Approach 1:
The patent extracts the interference measurement function from CRS and creates a separate CSI-IM resource structure. This allows interference to be measured independently from reference signal transmissions, eliminating the overestimation problem that occurs when CRS transmissions dominate the measurement at low loads.
Data Source
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AI summary
Embodiments of the present disclosure relate to channel state information measurement in communication networks. According to embodiments of the present disclosure, the measurement resource unit, MRU, configuration is determined based on the number of MRU and the identity of the cell. The MRU configuration is scalable and the set of MRUs is reused by the network. In this way, the resources are saved and the accuracy is improved.