CSI Feedback Flexibility in 3D MIMO Systems
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Solution Overview
Problem
Current CSI measurement and feedback methods are not specifically designed for 3D MIMO technology, limiting flexibility and efficiency in channel state information feedback.
Innovation Solution
A CSI feedback method that involves receiving and sending CSI process configuration information, including reference signal resources and interference measurement resources, to obtain and send CSI with a target index representing the target reference signal or interference measurement resource, enhancing flexibility in CSI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional CSI feedback methods are used, then the feedback process is simple, but the flexibility and efficiency in 3D MIMO systems is limited
Solution Approach 1:
The patent segments the CSI feedback process into distinct components: reference signal resource selection, interference measurement resource selection, and CSI calculation. By dividing the complex feedback process into manageable segments, the system achieves flexibility in 3D MIMO configurations while maintaining operational simplicity through structured procedures.
Solution Approach 2:
The patent implements dynamic resource selection mechanisms where the terminal can dynamically choose from multiple reference signal resources (K options) and interference measurement resources (M options) based on current channel conditions. This dynamic adaptability enables the system to optimize CSI feedback for various 3D MIMO scenarios without requiring a completely new feedback protocol.
2Measurement precision
If multiple reference signal resources and interference measurement resources are provided, then CSI feedback precision is improved, but the complexity of resource configuration increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple reference signal resources (K resources) and interference measurement resources (M resources) before the actual CSI measurement process. This allows the terminal to select from pre-prepared resources during feedback, achieving high measurement precision without the complexity of real-time resource configuration. The base station prepares the resource sets in advance, and the terminal simply needs to select from these pre-configured options.
3Productivity
If 3D MIMO technology is implemented, then system capacity and throughput are increased, but existing CSI feedback methods do not fully support the technology
Solution Approach 1:
The patent creates a universal CSI feedback mechanism that can handle multiple 3D MIMO configurations through a single standardized process. The feedback method is designed to be multi-functional, supporting various beam directions (horizontal and vertical adjustments) and antenna configurations (1D and 2D antennas) within the same feedback framework. This universality enables the system to maintain high throughput while achieving broad adaptability to different 3D MIMO scenarios.
Data Source
AI summary
A channel state information (CSI) feedback method is provided. A receive end receives CSI process configuration information. The CSI process configuration information includes at least one CSI process, and a first CSI process in the at least one CSI process is associated with K reference signal resources and M interference measurement resources. For the first CSI process, the receive end obtains a target reference signal resource based on the K reference signal resources, obtains a target interference measurement resource based on the M interference measurement resources, and obtains CSI based on the target reference signal resource and the target interference measurement resource. The receive end sends the CSI. The CSI includes a target index, and the target index is used to represent the target reference signal resource and/or the target interference measurement resource. In this way, CSI feedback flexibility is improved.