PMI Feedback for Dynamic 3D Beam-Forming in Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems, such as LTE/LTE-A, do not support the feedback of vertical Pre-coding Matrix Indicators (PMIs) necessary for dynamic 3D beam-forming, limiting the improvement of throughput at the edge of a cell.
Innovation Solution
A method and system for feeding back and receiving PMIs, including horizontal and vertical PMIs, in both non-periodical and periodical Channel State Information (CSI) feedback modes, enabling dynamic 3D beam-forming by determining and transmitting PMIs through specific feedback modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing LTE/LTE-A feedback modes are used, then the system structure remains simple and compatible, but vertical PMI feedback is not supported and 3D beam-forming cannot be achieved
Solution Approach 1:
The patent segments the PMI feedback into horizontal PMI and vertical PMI components, allowing them to be fed back separately through existing PUCCH formats. This segmentation enables 3D beam-forming support while maintaining compatibility with existing feedback mechanisms, as each component can be transmitted using established procedures.
Solution Approach 2:
The patent extends the feedback mechanism from two-dimensional (horizontal only) to three-dimensional (horizontal and vertical) by adding vertical PMI feedback capability. This dimensional expansion enables 3D beam-forming while utilizing existing feedback channels, thus improving adaptability without requiring a complete system redesign.
2Productivity
If vertical PMI feedback is added to existing feedback modes, then 3D beam-forming capability is enabled, but the feedback mechanism becomes more complex
Solution Approach 1:
The patent makes existing PUCCH feedback formats universal by enabling them to carry both horizontal and vertical PMI information. The same feedback channels and procedures are used for both 2D and 3D beam-forming scenarios, allowing the system to maintain simplicity while achieving improved throughput through multi-functional utilization of existing resources.
Solution Approach 2:
The patent changes the parameter configuration of existing feedback modes to include vertical PMI information. By modifying the feedback content parameters rather than creating entirely new feedback mechanisms, the system enables 3D beam-forming and improves cell edge throughput while keeping the overall mechanism relatively simple and manageable.
3Measurement precision
If comprehensive CSI feedback including vertical PMI is implemented, then beam-forming accuracy improves, but feedback overhead increases
Solution Approach 1:
The patent segments the comprehensive CSI feedback into distinct horizontal and vertical PMI components, each transmitted through dedicated portions of the feedback message. This segmentation allows for precise channel state information feedback while maintaining manageable feedback overhead, as each component can be optimized independently for its specific purposes.
Solution Approach 2:
The patent implements partial feedback by providing vertical PMI information only when and where needed for 3D beam-forming, rather than universally feeding back all possible CSI parameters. This selective approach improves measurement precision for beam-forming applications while avoiding excessive feedback overhead in scenarios where 3D beam-forming is not required.
Data Source
AI summary
The embodiments of the disclosure relate to the technical field of wireless communications, and particularly relate to a method, a system and a device for feeding back and receiving a Pre-coding Matrix Indicator (PMI), which is used for feeding back a vertical dimension PMI. The method for feeding back the PMI provided by the embodiments of the disclosure comprises: confirming the PMI needed to be fed back, wherein the PMI comprises a horizontal dimension PMI and a vertical dimension PMI, or a PMI combined by horizontal dimension and vertical dimension (801); feeding back the confirmed PMI in a non periodic Channel State Information (CSI) feedback mode or a periodic CSI feedback mode (802). Since the capability of feeding back the vertical dimension PMI, dynamic 3D beam shaping technology can be implemented and the throughput of the user equipments in the edge of cell and the average throughput can be improved.