3D MIMO Beam Selection Using CSI-RS Measurement Resources
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Solution Overview
Problem
Conventional methods for beam selection in 3D MIMO systems are not accurate enough, leading to inefficiencies in beam-forming and increased interference between beams, as they rely on conventional reference signals that do not effectively reflect specific beam-formed gains for each user equipment (UE).
Innovation Solution
The proposed solution involves configuring user equipment (UE) with enhanced measurement resources, such as channel state information reference signals (CSI-RSs), which allow the UE to measure and report more accurate beam-formed gains, enabling the base station to select optimal beams for 3D MIMO transmission through improved channel state information processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional reference signals are used for beam selection, then the system can operate with standard measurement resources, but the beam selection accuracy is insufficient and beam-formed gain cannot be effectively reflected
Solution Approach 1:
The patent segments the measurement process by introducing dedicated CSI-RS resources specifically for beam measurement, separate from conventional reference signals. This segmentation allows accurate beam-formed gain measurement while maintaining standard operation for other purposes.
Solution Approach 2:
The patent introduces CSI-RS as an intermediary measurement resource that mediates between the base station's beam transmission and the UE's measurement capability. This intermediary enables accurate beam selection without requiring changes to the core transmission system.
2Reliability
If multiple antennas are used for joint transmission to improve efficiency and reliability, then system performance increases, but inter-antenna co-channel interference becomes more complex
Solution Approach 1:
The patent implements feedback through UE measurement reports on CSI-RS resources. The UE measures beam-formed gains and reports back to the base station, enabling the system to select beams with minimal interference and adjust transmission accordingly.
Solution Approach 2:
The patent changes the measurement parameter from conventional reference signal metrics to CSI-RS based beam-formed gain measurements. This parameter change enables accurate identification of optimal beams that minimize inter-beam interference while maintaining reliability.
3Power
If beam width is narrowed to increase antenna gain, then beam-forming effectiveness improves, but beam selection and coordination become more critical and complex
Solution Approach 1:
The patent enables the system to self-optimize beam selection through automated UE measurements and reporting. The base station configures CSI-RS resources and automatically selects beams based on UE feedback, reducing manual coordination complexity while maintaining high antenna gain.
Solution Approach 2:
The patent performs preliminary beam measurement and selection using CSI-RS before actual data transmission. This preliminary action identifies optimal beams in advance, simplifying subsequent coordination and ensuring high gain without real-time complexity.
Data Source
AI summary
Embodiments of the present disclosure provide a beam selection method and apparatus and a communication system. The method includes: a base station configures user equipment (UE) with measure resources, each measure resource corresponding to one beam: and selects a beam used for performing 3-dimensional multiple input multiple output (3D MIMO) transmission according to a measurement result reported by the UE. With the method of the embodiments of the present disclosure, measurement of the UE end is used to optimize beam selection, thereby improving accuracy of beam-forming at the base station end.