Enhanced CSI Process for Interference Cancellation Reporting
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Solution Overview
Problem
Current wireless communication systems lack an effective method to report channel state information reflecting interference cancellation performance, which hinders system throughput improvement.
Innovation Solution
A method for a user equipment (UE) to receive a configuration for an enhanced channel state information (CSI) process, measure interference signals, and calculate enhanced channel quality information (CQI) by canceling interference from specific cells, using a dummy or known sequence signal, and report this information to the serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional channel state reporting is used, then the reporting mechanism is simple, but the interference cancellation performance is not reflected
Solution Approach 1:
The patent applies preliminary action by having the UE perform interference cancellation calculations before the actual channel state reporting. The UE calculates the interference component and subtracts it from the total received signal to obtain the estimated desired signal, then uses this pre-processed information to generate accurate CQI values that reflect interference cancellation performance.
Solution Approach 2:
The patent introduces an intermediary approach by using a dedicated CSI-IM (Channel State Information - Interference Measurement) resource that separates the measurement function from the data reception function. This intermediary resource allows the UE to measure interference independently and accurately without being contaminated by data signals, enabling precise interference characterization.
2Reliability
If interference cancellation is performed, then the communication quality improves, but the measurement and calculation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the signal measurement process into separate components: a desired signal measurement portion (using CSI-RS) and an interference measurement portion (using CSI-IM). This segmentation allows the UE to independently measure and characterize interference without the contamination of data signals, reducing measurement difficulty while maintaining communication quality improvement through interference cancellation.
Data Source
AI summary
Provided is a method for reporting a channel state, on which an interference cancellation performance is reflected, in a wireless communication system according to an embodiment of the present invention. The method may include: receiving, from a serving cell, a configuration for a channel state information (CSI) process (hereinafter, referred to as “enhanced CSI process”) for reporting the channel state on which the interference cancellation performance is reflected; receiving a signal at a CSI-interference measurement (CSI-IM) resource according to the enhanced CSI process; and calculating a value of the reporting of the channel state on which the interference cancellation performance is reflected, by removing an interference signal, which is from a specific interference cell among one or more interference cells.