CSI Interference Measurement Using Zero-Power CSI-RS
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Solution Overview
Problem
Current wireless communication systems face challenges in precisely measuring interference, particularly in inter-cell interference situations, which can lead to inaccurate channel state information reporting and resource allocation inefficiencies.
Innovation Solution
A method is introduced where user equipment derives interference measurement based on zero-power CSI-RS related to CSI-IM resource configuration, calculates CQI values, and transmits CSI including these values to an eNB, with specific configurations for RE placement within ECCEs and PRB pairs to improve interference measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference measurement is performed in inter-cell interference situations, then channel state information can be obtained, but measurement precision deteriorates due to inaccurate interference measurement
Solution Approach 1:
The patent segments the interference measurement process by introducing CSI-IM (Channel State Information - Interference Measurement) resources that are specifically configured for interference measurement. These CSI-IM resources are separated from regular data transmission resources, allowing dedicated interference measurement without contamination from data signals. The eNB configures multiple CSI-IM resource sets that can be measured independently, enabling precise interference characterization for different spatial directions and transmission scenarios.
Solution Approach 2:
The patent introduces CSI-RS (Channel State Information - Reference Signal) as an intermediary element that facilitates accurate interference measurement. The CSI-RS signals are transmitted by the eNB and received by the UE, serving as a reference for measuring both channel characteristics and interference levels. By using these standardized reference signals, the system can separately measure channel effects and interference effects, improving the overall measurement precision.
2Measurement precision
If REs for CSI-IM are placed in ECCEs, then control channel interference can be measured, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by placing CSI-IM resources specifically within ECCE (Enhanced Control Channel Element) structures where control channel transmission occurs. This localized placement allows the UE to measure interference characteristics specific to control channel resources without affecting data channel measurements. The eNB can configure CSI-IM resources in specific ECCEs based on the actual control channel allocation patterns, enabling targeted interference measurement for control information delivery.
Solution Approach 2:
The patent implements preliminary action by pre-configuring CSI-IM resource patterns that align with expected ECCE structures before actual control channel transmission. The eNB provides CSI-IM resource configuration information to the UE in advance through RRC signaling, allowing the UE to prepare the appropriate measurement resources. This pre-configuration simplifies the measurement process during actual operation, as the UE already has the correct resource mappings established.
Data Source
AI summary
One embodiment of the present invention relates to a method by which a terminal reports channel state information (CSI) in a wireless communication system, the channel state information reporting method comprising the steps of: deriving an interference measurement on the basis of a zero power CSI-reference signal (RS) related to a CSI-interference measurement (IM) resource configuration: calculating a channel quality information (CQI) value on the basis of the interference measurement; and transmitting CSI including the CQI value to a base station, wherein at least one RE according to the CSI-IM resource configuration is included in different ECCEs included in a PRB pair.