3D MIMO Channel State Information Feedback via Segmented Beamforming
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Solution Overview
Problem
Current 3D MIMO CSI feedback methods incur high pilot resource overhead and complexity for User Equipment (UE), leading to increased power consumption and difficulty in processing CSI feedback, which hinders the implementation and resource efficiency of 3D MIMO techniques.
Innovation Solution
A method where the network side device determines beamforming array information in one dimension, beamforms a pilot signal in the second dimension, and transmits it to the UE, allowing the UE to measure and report CSI in the second dimension, thereby reducing the need for excessive pilot resources and simplifying CSI processing at the UE side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pilot resources are configured in both horizontal and vertical dimensions for 3D MIMO CSI feedback, then the CSI feedback accuracy is improved, but the pilot resource overhead increases significantly
Solution Approach 1:
The patent segments the 3D MIMO CSI feedback process into two independent stages: first obtaining vertical dimension beamforming information, then using it to pre-process horizontal dimension pilot resources. This segmentation allows the system to acquire accurate 3D CSI feedback while significantly reducing the number of pilot resources needed in the horizontal dimension, as the vertical dimension information is obtained separately and used to enhance the horizontal measurements.
Solution Approach 2:
The patent applies preliminary action by first acquiring beamforming information in the vertical dimension before configuring and measuring horizontal dimension pilot resources. The obtained vertical beamforming information is then used to pre-process and optimize the horizontal pilot resources, thereby reducing the overall pilot overhead while maintaining measurement accuracy.
2Measurement precision
If multiple pilot resources are configured for vertical dimension beamforming, then the beamforming accuracy is improved, but the UE processing complexity increases
Solution Approach 1:
The patent segments the complex task of processing multiple pilot resources into two separate, simpler tasks: first processing vertical dimension beamforming information, then using that result to guide horizontal dimension pilot resource processing. This segmentation reduces UE processing complexity by breaking down the originally complex joint 3D processing into sequential, more manageable steps.
Solution Approach 2:
The patent applies preliminary action by first completing the vertical dimension beamforming information acquisition and processing before proceeding to horizontal dimension pilot resource measurements. This preliminary step simplifies subsequent horizontal processing, as the UE only needs to process horizontal pilots with the benefit of already-obtained vertical beamforming information, rather than processing all dimensions simultaneously.
3Reliability
If comprehensive pilot resources are configured for 3D MIMO, then the system performance is improved, but the power consumption increases
Solution Approach 1:
The patent segments the power-consuming pilot resource configuration into two parts: a minimal vertical dimension configuration and a reduced horizontal dimension configuration. By obtaining vertical beamforming information separately and using it to optimize horizontal pilot resources, the system maintains comprehensive 3D MIMO performance while significantly reducing the total number of pilot resources that need to be transmitted and processed, thereby reducing power consumption.
Solution Approach 2:
The patent applies preliminary action by first acquiring vertical dimension beamforming information, which then serves as a foundation for optimizing horizontal pilot resource configuration. This preliminary step enables the system to achieve comprehensive 3D performance with fewer overall pilot resources, reducing the energy required for transmission, reception, and processing across the entire system.
Data Source
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AI summary
A CSI feedback method, a CSI acquisition method, a CSI feedback device and a CSI acquisition device are provided, so as to reduce pilot resources configured for a UE and reduce the difficulty in processing CSI progresses at a UE side, thereby to facilitate the CSI feedback and acquisition and save resources. The CSI acquisition method includes steps of: determining beamforming array information in a first dimension; beamforming a pilot signal in a second dimension in accordance with the beamforming array information in the first dimension, and transmitting the beamformed pilot signal in the second dimension to a UE through a pilot resource in the second dimension; and receiving, from the UE, CSI in the second dimension obtained by measuring the pilot signal in the second dimension.