Partial Antenna Array Beamforming CSI Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information for partial antenna array based beamforming, which affects the performance of beamforming in wireless communication systems.
Innovation Solution
A method and apparatus for efficiently reporting channel state information (CSI) for beamforming using a partial antenna array, allowing user equipment (UE) to effectively communicate CSI to a base station (eNB) for adaptive beamforming, enabling efficient beamforming operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full antenna array based beamforming is used, then beamforming performance is improved, but feedback overhead increases
Solution Approach 1:
The antenna array is divided into multiple sub-arrays, and the channel state information is reported separately for each sub-array. This segmentation allows the system to achieve beamforming performance close to full array while reducing the overall feedback overhead by only reporting essential sub-array specific information.
Solution Approach 2:
Instead of reporting complete channel state information for all antennas in the full array, the system reports partial information only for the active sub-arrays. This partial action approach maintains adequate beamforming performance while significantly reducing feedback overhead.
2Loss of information
If partial antenna array is used, then feedback overhead is reduced, but beamforming performance deteriorates
Solution Approach 1:
The system dynamically selects which sub-arrays to activate and reports channel state information based on current channel conditions and traffic requirements. This dynamic adaptation allows the system to maintain beamforming performance by activating sufficient sub-arrays while reducing feedback overhead when fewer sub-arrays are needed.
Solution Approach 2:
The system changes the parameter of antenna array configuration by selecting different numbers and combinations of sub-arrays based on channel conditions. This parameter change allows optimization between beamforming performance and feedback overhead by adjusting the effective antenna array size dynamically.
Data Source
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AI summary
A method for receiving a signal from a base station by a user equipment, using beamforming based on a massive antenna array of the base station in a wireless communication system is disclosed. The method includes configuring an effective antenna array in the massive antenna array, receiving a pilot signal corresponding to the effective antenna array from the base station, reporting channel state information for beamforming to the base station, using the pilot signal, and receiving a user equipment-specifically beamformed signal through the effective antenna array from the base station, wherein the effective antenna array is defined as one or more horizontal antenna ports and one or more vertical antenna ports.