CSI-RS Beam Management for mmWave Path Loss
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Solution Overview
Problem
In mmWave wireless communication systems, managing beams effectively is challenging due to high path loss and the need for precise beamforming, especially in areas with radio shadows, where conventional methods fail to prevent beam mismatch and ensure reliable signal transmission.
Innovation Solution
A method for determining and managing beams using channel state information-reference signals (CSI-RS) that configures primary and secondary beams, allowing user equipment (UE) to receive CSI-RS from a base station, determine the appropriate beam, and feedback preferred beams to the base station, with procedures for beam recovery when mismatches occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is elaborately designed for mmWave communication, then signal transmission reliability is improved, but device complexity and beam management difficulty increase
Solution Approach 1:
The patent segments beam management into two distinct levels: primary beam management using CSI-RS resources and secondary beam management using CSI-RS ports. This segmentation allows independent optimization of each beam level, reducing overall management complexity while maintaining reliable signal transmission through coordinated operation of both beam types.
Solution Approach 2:
The patent implements dynamic beam switching mechanisms where the UE can switch between different primary and secondary beams based on channel conditions. The base station dynamically adjusts beam configurations and the UE dynamically selects preferred beams, enabling adaptive response to changing propagation conditions without requiring complex static beam management.
2Reliability
If beam configuration is optimized for path loss mitigation, then communication performance in radio shadow areas is improved, but beam mismatch risk increases
Solution Approach 1:
The patent employs preliminary beam configuration where the base station pre-configures multiple primary and secondary beams before actual communication. The UE performs beam measurement and selection in advance, identifying preferred beams before data transmission begins. This preliminary action ensures that suitable beams are ready for use, mitigating path loss effects while reducing beam mismatch risk during actual communication.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports preferred beam information (CRI and CSI-RS port index) to the base station. This feedback enables the base station to verify beam selection accuracy and adjust configurations to prevent beam mismatch, while the UE can request beam switching if mismatch is detected, thereby reducing beam mismatch harm while maintaining optimized path loss compensation.
3Adaptability or versatility
If hierarchical beam management with primary and secondary beams is implemented, then beam management flexibility is improved, but system complexity increases
Solution Approach 1:
The patent divides the beam management system into hierarchical segments: primary beams (CSI-RS resources) for broad coverage and secondary beams (CSI-RS ports) for precise signal transmission. Each segment has dedicated configuration and management procedures, allowing flexible adaptation to different scenarios while managing complexity through modular design where each segment can be independently optimized.
Solution Approach 2:
The patent creates a universal beam management framework where the same CSI-RS structure serves multiple functions: primary beams provide broad coverage and initial access, while secondary beams enable precise beamforming and channel estimation. This multi-functionality increases flexibility without proportionally increasing complexity, as the same underlying mechanism supports both primary and secondary beam operations.
Data Source
AI summary
According to one embodiment of the present disclosure, a method for determining a beam used in communication by a terminal in a mmWave communication system can be provided. The method for determining the beam may comprise a step of receiving CSI-RS from a base station, and a step of determining the beam on the basis of the CSI-RS. A CSI-RS resource and a CSI-RS port are determined on the basis of the CSI-RS, and the determined beam may correspond to the CSI-RS resource and the CSI-RS port.