CSI-RS Resource Set Configuration for Beam Management
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Solution Overview
Problem
Current beam management schemes in wireless communication systems, such as P1, P2, and P3, face complexity and limitations in UE implementation due to the need for frequent RX beam changes per CSI-RS time unit, which increases implementation complexity and is only suitable for high-end UEs, while also constraining the number of CSI-RS within a set and requiring complex reporting mechanisms.
Innovation Solution
A novel CSI-RS configuration that allows a single set of CSI-RS resources to be transmitted using different TX beams, enabling the UE to apply different RX beams for different sets, with semi-persistent transmission and reporting of selected CSI-RS indices based on quality criteria, reducing UE complexity and supporting various UE categories with flexible beam sweeping capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CSI-RS resource sets are configured in a resource setting with different TX beams for different CSI-RS resources, then beam management capability is improved, but UE implementation complexity increases due to frequent RX beam changes per CSI-RS time unit
Solution Approach 1:
The patent divides the beam management process into two distinct procedures: TX beam sweeping (P1) where the BS transmits multiple CSI-RS resources with different TX beams, and RX beam sweeping (P2) where the UE measures CSI-RS resources with different RX beams. This segmentation allows the system to achieve comprehensive beam management capability while reducing UE complexity by separating the functions that were previously combined in a single resource set.
Solution Approach 2:
The patent introduces a new dimension to beam management by configuring multiple CSI-RS resource sets across different resource settings, rather than within a single resource setting. This dimensional change allows the UE to perform RX beam sweeping across resource sets while the BS performs TX beam sweeping within resource sets, thereby achieving comprehensive beam management with reduced UE implementation complexity.
2Manufacturing precision
If multiple CSI-RS resource sets are configured for beam management, then beam refinement capability is improved, but the number of beams that can be used by the UE is limited
Solution Approach 1:
The patent enables dynamic beam selection by configuring multiple CSI-RS resource sets with different parameters (e.g., different spatial QCL assumptions, different repetition settings). The UE can dynamically select the appropriate resource set and corresponding beams based on channel conditions, thereby achieving beam refinement capability while maintaining flexibility in the number of usable beams through adaptive configuration rather than fixed limitations.
3Manufacturing precision
If RX beam sweeping is performed within a CSI-RS resource set, then RX beam refinement is improved, but UE complexity increases and reporting mechanisms become more complex
Solution Approach 1:
The patent extracts the RX beam sweeping function from the TX beam sweeping resource set configuration. By configuring separate CSI-RS resource sets with specific parameters (repetition OFF, spatial QCL assumptions), the UE can perform RX beam sweeping independently without the complexity of simultaneously managing TX beam changes. This extraction simplifies the reporting mechanism as the UE only needs to report CRI for the selected resource set rather than managing complex beam pair indicators.
Data Source
AI summary
A method of transmitting Channel State Information (CSI)-Reference Signals (RSs) in a wireless communication system that includes a base station (BS) and a user equipment (UE) includes transmitting, from the BS to the UE, first multiple CSI-RSs in a CSI-RS resource set that consists of CSI-RS resources. The first multiple CSI-RSs are transmitted using the CSI-RS resources, respectively. The CSI-RS resource set is repeated in a time domain or a frequency domain. The transmitting transmits second multiple CSI-RSs in the repeated CSI-RS resource set.