Generic CSI Segmentation for Interference Cancellation
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Solution Overview
Problem
In wireless communication systems, existing methods struggle to effectively remove interference and accurately receive signals, particularly in multi-user MIMO environments where interference from neighboring cells affects channel state information (CSI) calculation and data demodulation.
Innovation Solution
A method is introduced where a UE transmits first generic CSI based on desired signal power and second generic CSI based on interference signal power, with recalculated CSI used to adjust for changed interference conditions, enabling improved interference cancellation and data reception by recalculating CSI using the interference condition changed after transmitting both CSIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CSI calculation methods are used in multi-user MIMO environments, then the calculation process is simple, but interference from neighboring cells degrades channel state information accuracy and data demodulation performance
Solution Approach 1:
The patent segments CSI calculation into two distinct components: first generic CSI based on desired signal power and second generic CSI based on interference signal power. This segmentation allows separate measurement and reporting of signal and interference characteristics, enabling more accurate CSI calculation that accounts for both components independently rather than treating them as a single combined measurement.
Solution Approach 2:
The patent changes the parameters used in CSI calculation by introducing separate power measurements for desired signals and interference signals. Instead of using a single CSI value, the system uses multiple parameters (first generic CSI and second generic CSI) that can be independently adjusted and combined, allowing dynamic adaptation to varying interference conditions in multi-user MIMO environments.
2Reliability
If interference cancellation techniques are applied to improve signal reception, then data demodulation accuracy improves, but the complexity of the receiving process increases
Solution Approach 1:
The patent applies preliminary action by having the UE pre-calculate and report first generic CSI and second generic CSI before data reception. These pre-calculated values contain interference characteristics that the base station can use to perform interference cancellation in advance, reducing the complexity of real-time interference removal during data demodulation and improving overall reception reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports first generic CSI and second generic CSI back to the base station. This feedback loop enables the base station to adjust transmission parameters and perform interference cancellation based on actual channel and interference conditions, improving data transmission reliability while distributing the complexity between UE measurement/reporting and base station processing.
Data Source
AI summary
The present invention relates to a wireless communication system. A method of removing interference and receiving data by means of a terminal in a wireless communication system according to an embodiment of the present invention may include: transmitting first generic channel state information (CSI) generated based on required signal power from a serving cell; transmitting second generic CSI generated based on interference signal power from an interference cell; and receiving data generated based on CSI recalculated by using an interference condition that has changed after the transmission of the first and second generic CSI.