Massive Antenna Array Feedback Reporting for Beamforming
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting feedback for massive antenna array based beamforming, which affects the performance and efficiency of beamforming in wireless communication systems.
Innovation Solution
A method for transmitting and receiving feedback information between user equipment and base stations to adaptively control beamforming using a partial antenna array, reducing feedback overhead and improving beamforming performance by selecting an effective antenna port set based on channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is reported using a massive antenna array for beamforming, then beamforming performance is improved, but feedback overhead increases
Solution Approach 1:
The patent segments the massive antenna array into multiple antenna ports and groups them for feedback reporting. Instead of reporting feedback for all antenna elements individually, the system divides the antenna array into manageable groups and reports feedback information for each group separately, thereby reducing the overall feedback overhead while maintaining beamforming performance.
Solution Approach 2:
The patent implements partial feedback reporting by selecting and reporting feedback information only for a subset of antenna ports rather than all antenna ports in the massive array. This partial action approach reduces feedback overhead significantly while still achieving effective beamforming through the reported subset information.
2Measurement precision
If feedback information is reported for all antenna ports, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the antenna ports into multiple groups and processes feedback information for each group separately. This segmentation reduces the complexity of feedback processing by breaking down the large-scale feedback task into smaller, more manageable sub-tasks, while still maintaining comprehensive channel state information through the aggregated feedback from all groups.
Solution Approach 2:
The patent dynamically adjusts the feedback reporting strategy by configuring different antenna port groups based on channel conditions and system requirements. This dynamic approach allows the system to adapt the level of feedback detail to actual needs, reducing unnecessary processing complexity while maintaining measurement precision when required.
3Loss of information
If a partial antenna array is used for beamforming, then feedback overhead is reduced, but beamforming gain decreases
Solution Approach 1:
The patent applies partial action by reporting feedback for only a selected subset of antenna ports rather than all ports. This partial feedback is sufficient to achieve effective beamforming in many scenarios, reducing overhead while maintaining acceptable beamforming gain through intelligent selection of which antenna ports to report.
Solution Approach 2:
The patent changes the parameter of feedback granularity by adjusting the number and configuration of antenna port groups reported. By dynamically changing these parameters based on system conditions, the system can optimize the trade-off between feedback overhead and beamforming gain, reporting more detailed information when high gain is needed and less when overhead reduction is prioritized.
Data Source
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AI summary
A method for transmitting feedback information to a base station by a user equipment, for massive antenna array based beamforming in a wireless communication system is disclosed. The method includes receiving information about a plurality of pilot patterns for a massive antenna array from the base station, estimating a plurality of channels corresponding to the plurality of pilot patterns by receiving a pilot signal based on the plurality of pilot patterns, and transmitting the feedback information for the plurality of channels to the base station, wherein the feedback information includes information about whether closed-loop beamforming or open-loop beamforming is applied to the plurality of channels and information about an effective antenna array for the plurality of channels.