CoMP Precoding Vector Decision via Inter-Cell Correlation
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Solution Overview
Problem
Current CoMP feedback schemes for LTE-Advanced do not consider inter-cell interference, resulting in poorer performance compared to joint precoding methods, and have high feedback overhead.
Innovation Solution
A method for deciding a precoding vector for CoMP that includes receiving channel state information with inter-cell correlation properties between serving and cooperating cells, allowing for joint precoding vector selection to minimize inter-cell interference and reduce feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate precoding is used for each cell in CoMP, then feedback overhead is reduced, but CoMP performance deteriorates due to not considering inter-cell interference
Solution Approach 1:
The patent combines the feedback information from multiple cells by introducing an inter-cell correlation matrix that captures the relationship between serving cell and cooperating cell channels. This merging approach allows the eNB to perform joint precoding that considers inter-cell interference while maintaining manageable feedback overhead through correlated information sharing.
Solution Approach 2:
The patent introduces an inter-cell correlation matrix as an intermediary that mediates between the serving cell and cooperating cell feedback information. This matrix serves as a compact representation that enables joint precoding decisions without requiring full channel state information from all cells, thus reducing feedback overhead while improving CoMP performance.
2Reliability
If joint precoding is used for CoMP, then CoMP performance improves by considering inter-cell interference, but feedback overhead increases
Solution Approach 1:
The patent extracts only the essential inter-cell correlation information from the full channel state, rather than transmitting complete channel matrices. By taking out only the correlation properties between serving and cooperating cells, the system achieves joint precoding capability with significantly reduced feedback overhead.
Solution Approach 2:
The patent changes the feedback parameter from full channel state information to inter-cell correlation matrix elements. This parameter transformation reduces the dimensionality and complexity of feedback while preserving the essential information needed for joint precoding, thus improving CoMP performance without proportionally increasing feedback overhead.
3Ease of manufacture
If per-cell feedback is used for CoMP, then feedback scheme is simple and backward-compatible, but inter-cell interference is not considered
Solution Approach 1:
The patent introduces dynamic joint precoding capability that can switch between separate and joint precoding modes based on channel conditions and feedback availability. The system dynamically adapts the precoding strategy by utilizing inter-cell correlation information when available, while maintaining backward compatibility with existing per-cell feedback schemes.
Data Source
AI summary
A precoding vector of coordinated multipoint transmission (CoMP) for at least one user equipment is decided by receiving the channel state information for CoMP from the user equipment, wherein the channel state information includes inter-cell correlation property between a serving cell serving the user equipment and a cooperating cell for CoMP; and deciding the precoding vector of CoMP based on the channel state information.