Beamformed Reference Signal Feedback for Wireless Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting interference feedback, particularly for devices with multiple antennas, as explicit feedback requires transmitting a large number of real numbers, which is burdensome and may not be useful for complex receivers.
Innovation Solution
The system allows user equipment (UE) to report feedback in the form of a beamformed reference signal (RS) and an associated normalization vector, enabling the base station to determine interference conditions and schedule uplink resources without requiring the full n × n matrix, thereby reducing the overhead and improving feedback efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If explicit feedback of interference matrix is transmitted from UE to access point, then interference information is provided, but feedback overhead increases significantly due to n×n matrix transmission
Solution Approach 1:
The patent extracts only the essential interference information from the complete n×n interference matrix. Instead of transmitting the full matrix, the system transmits a reduced set of parameters that capture the dominant interference characteristics. This extraction principle reduces feedback overhead while preserving the most critical interference information needed for downlink precoding optimization.
Solution Approach 2:
The interference matrix transmission is segmented into multiple components: a reduced-rank representation of the interference subspace and optional supplemental information. This segmentation allows the system to transmit interference information in a structured manner that reduces overall overhead while maintaining accuracy where most needed.
2Loss of information
If full n×n interference matrix is transmitted, then complete interference information is provided, but device complexity and processing burden increase
Solution Approach 1:
The patent applies extraction by identifying and transmitting only the essential components of interference information. The reduced-rank interference representation extracts the dominant interference subspace, eliminating redundant information while maintaining the complexity necessary for effective downlink precoding. This reduces both transmission overhead and processing complexity at the access point.
3Measurement precision
If detailed interference feedback is provided, then interference accuracy is improved, but feedback overhead and processing burden increase
Solution Approach 1:
The patent extracts the essential interference measurement information by transmitting a reduced-rank representation that captures the dominant interference characteristics. This extraction maintains measurement precision for the most significant interference components while reducing the overall data volume of feedback transmitted from UE to access point.
Data Source
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AI summary
Aspects of the present disclosure describe receiving, from an access point, an indication of at least one of a beamforming method for beamforming a RS or a normalization method for normalizing power for beamforming the RS. A channel covariance matrix corresponding to interference over a plurality of antenna ports can be generated, as well as a RS beamforming matrix based at least in part on at least one of modifying the channel covariance matrix or on the normalization method. The RS can be generated based on the RS beamforming matrix and the beamforming method. The RS can be transmitted to the access point based on the RS beamforming matrix.