UE Interference Measurement via CSI-IM Resource Segmentation
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Solution Overview
Problem
In radio communications systems, user equipment (UE) struggles to accurately measure downlink channel state information (CSI) due to interference from micro base stations when using CSI-IM resources, as the received signal may include data signals, leading to inaccurate interference measurements.
Innovation Solution
The UE determines a specific resource for interference measurement based on zero-power or non-zero power CSI-RS configuration information and CSI-IM configuration, ensuring that interference measurement and data reception do not occur simultaneously, allowing only interfering signals to be measured, thereby improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures interference on CSI-IM resources in a CoMP scenario with macro and micro base stations, then the UE can calculate CSI for coordination between base stations, but the measured interference includes data signals from the micro base station which reduces measurement accuracy
Solution Approach 1:
The patent segments the resource allocation by dividing subframes into two distinct types: interference measurement subframes where the micro base station transmits only reference signals (no data), and data transmission subframes where the micro base station transmits data to the UE. This segmentation allows the UE to perform accurate interference measurement on CSI-IM resources during interference measurement subframes without contamination from data signals, while still maintaining CoMP coordination capability through separate CSI calculations for different transmission scenarios.
2Productivity
If the UE performs interference measurement and data reception simultaneously on the same resource, then resource utilization is maximized, but the interference measurement becomes inaccurate due to presence of data signals
Solution Approach 1:
The patent implements periodic action by configuring the network to alternately transmit different types of signals in different subframes. Specifically, interference measurement subframes occur periodically where only reference signals are transmitted, followed by data transmission subframes. This periodic pattern allows the UE to regularly perform accurate interference measurements while maintaining high overall resource utilization through continuous data transmission in non-measurement subframes.
Data Source
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AI summary
Embodiments of the present invention provide an interference measurement method, a base station, and a user equipment. The method includes: determining, by a user equipment, a first resource for interference measurement in a first subframe or determining a second resource not for interference measurement in the first subframe according to at least one of the zero-power CSI-RS configuration information, the non-zero power CSI-RS configuration information, and the CSI-IM configuration information; and performing interference measurement on the first resource, or performing no interference measurement on the second resource. The embodiments of the present invention can improve precision of interference measurement.