Beamformed Reference Signal Feedback for Wireless Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting interference feedback from user equipment (UE) to access points, particularly with complex receivers, as explicit feedback requires large matrices, which can be burdensome and not useful for the access point.
Innovation Solution
The method involves generating and transmitting a beamformed reference signal (RS) along with a normalization vector from the UE to the base station, allowing the base station to determine interference conditions and schedule uplink resources without requiring the full n × n matrix, thereby reducing feedback overhead.
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 n² real numbers required
Solution Approach 1:
The patent extracts only the essential interference information needed for resource scheduling rather than transmitting the complete n² interference matrix. The UE identifies and reports only the dominant interferers and their characteristics, separating the critical information from the redundant data in the full matrix.
Solution Approach 2:
Instead of transmitting the actual complete interference matrix, the patent uses simplified representations or compressed forms that capture the essential interference characteristics. The access point receives a condensed version that allows it to reconstruct or infer the necessary scheduling decisions without processing the full matrix.
2Loss of information
If full n × n interference matrix is reported by UE, then complete interference data is available, but complexity of feedback processing increases
Solution Approach 1:
The patent extracts only the essential interference information needed for resource scheduling rather than transmitting the complete n² interference matrix. The UE identifies and reports only the dominant interferers and their characteristics, separating the critical information from the redundant data in the full matrix.
Solution Approach 2:
The patent applies partial action by reporting only the most significant interference components rather than the complete matrix. The UE identifies top-k dominant interferers or uses compressed representations that capture essential characteristics without transmitting all n² elements, achieving sufficient accuracy with reduced complexity.
3Reliability
If complex receivers are used at UE, then reception performance is improved, but the feedback becomes less useful for access point scheduling decisions
Solution Approach 1:
The patent extracts interference information that is specifically useful for access point scheduling decisions, separate from the detailed processing performed by complex UE receivers. The feedback focuses on macroscopic interference characteristics that guide resource allocation rather than microscopic receiver-level details.
Solution Approach 2:
The patent inverts the traditional feedback approach by having the UE report interference characteristics from the perspective of resource scheduling needs rather than receiver performance optimization. The feedback is structured to directly support access point scheduling decisions, converting receiver-centric information into scheduler-centric information.
Data Source
Figure 1
Figure 2
Figure 3
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 modifying the channel covariance matrix and 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.