CSI Feedback Mode Configuration for 3D Beamforming
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently feeding back channel state information (CSI) when three-dimensional (3D) beamforming is applied, particularly in configuring CSI feedback modes and including necessary information for both vertical and horizontal domains.
Innovation Solution
A method and device for user equipment (UE) to receive a pilot signal from a base station, configure CSI transmission modes, and feed back CSI, which includes precoding matrix index (PMI) information for both vertical and horizontal beamforming, using either a first transmission mode with wideband or UE-selected channel quality indicators (CQI), and a second transmission mode with both 3D-CQI and selective V-CQI/H-CQI, via physical uplink control or shared channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 3D beamforming is applied to wireless communication system, then communication efficiency and service availability are improved, but the complexity of CSI feedback configuration and information management increases
Solution Approach 1:
The patent segments CSI feedback into multiple transmission modes (first transmission mode with wideband CQI, second transmission mode with UE-selected CQI, third transmission mode with 3D-CQI and V-CQI/H-CQI). This segmentation allows the system to handle 3D beamforming complexity by dividing CSI feedback into manageable components that can be selectively transmitted based on channel conditions and system requirements.
Solution Approach 2:
The patent implements dynamic CSI feedback mechanisms where the UE can select between different CQI types (wideband, UE-selected, 3D-CQI, V-CQI, H-CQI) based on current channel conditions. The base station dynamically configures which CSI parameters to feed back, allowing the system to adapt to varying 3D beamforming requirements without fixed complexity.
2Measurement precision
If multiple PMI information for vertical and horizontal beamforming is included in CSI, then beamforming precision is improved, but the amount of feedback information and processing overhead increases
Solution Approach 1:
The patent applies local quality by providing different levels of PMI information precision for vertical and horizontal beamforming based on specific needs. The system can include PMI for vertical beamforming, horizontal beamforming, or both, depending on the transmission mode and channel conditions, rather than always providing maximum precision for all parameters.
Solution Approach 2:
The patent creates a universal CSI feedback framework that can accommodate multiple types of PMI information (vertical, horizontal, or both) within a single feedback mechanism. The same feedback channel structure supports different precision levels and information types, making the system versatile in handling various beamforming precision requirements without requiring separate dedicated channels for each PMI type.
Data Source
AI summary
A method and device for feeding back channel state information (CSI) by a user equipment (UE) in a wireless communication system applied three-dimensional (3D) beamforming. The method includes: receiving a pilot signal (reference signal) from a base station; configuring a CSI transmission mode in one of a first transmission mode and a second transmission mode based on motion information of the UE; and feeding back the CSI based on the configured CSI transmission mode. The first transmission mode transmits the CSI including precoding matrix index (PMI) information for one of vertical beamforming or horizontal beamforming. The second transmission mode transmits the CSI including PMI information for both vertical beamforming and horizontal beamforming.