CSI-RS Resource Configuration for Multi-Beam Transmission in 5G NR
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Solution Overview
Problem
Current 5G NR beam management in MIMO systems lacks a method to efficiently configure CSI-RS resources for transmitting multiple beams in a single symbol, limiting beam alignment accuracy and flexibility in meeting diverse usage scenario requirements.
Innovation Solution
The proposed method involves configuring CSI-RS resources using a default CSI-RS configuration method in NR, allowing for the transmission of multiple beams in a single symbol by assigning empty PDSCH or mini-slots for CSI-RS transmission, and allocating non-overlapping CSI-RS resources across different symbols or frequencies to support flexible beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resources are configured for beam management in NR MIMO, then beam alignment accuracy is improved, but resource configuration complexity increases due to lack of standardized methods
Solution Approach 1:
The patent applies parameter changes by modifying the resource configuration parameters of CSI-RS resources. Specifically, it configures multiple CSI-RS resources with different time-frequency resource allocations, periodicities, and cyclic shifts to enable multiple beam transmissions. By changing these parameters systematically, the patent achieves improved beam alignment accuracy while maintaining manageable configuration complexity through standardized parameter sets.
Solution Approach 2:
The patent segments the beam management function by configuring multiple separate CSI-RS resources, each associated with a specific transmission beam. This segmentation allows independent configuration and optimization of each beam's resources, enabling precise beam alignment while organizing the complexity into manageable, discrete resource units that can be independently managed.
2Adaptability or versatility
If CSI-RS resources are allocated flexibly across different symbols and frequencies, then adaptability to diverse usage scenarios is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements universality by designing a multi-functional CSI-RS resource configuration that can serve different usage scenarios (eMBB, mMTC, URLLC) through a unified framework. The same CSI-RS resource configuration mechanism supports various beam management needs across different scenarios by adjusting parameters like periodicity, time-frequency location, and resource allocation patterns, rather than requiring separate mechanisms for each scenario.
Solution Approach 2:
The patent applies dynamics by enabling flexible and dynamic allocation of CSI-RS resources across different time symbols and frequency resources. The configuration allows adaptive adjustment of resource locations, periodicities, and allocations based on channel conditions and service requirements, providing the needed adaptability while using standardized dynamic parameter adjustment rather than complex static configurations.
3Productivity
If multiple beams are transmitted in a single symbol, then data transmission efficiency is improved, but interference management becomes more difficult
Solution Approach 1:
The patent uses orthogonal resources as an intermediary mechanism to separate multiple beam transmissions. By allocating different CSI-RS resources with orthogonal characteristics (different cyclic shifts, orthogonal covers, or non-overlapping time-frequency resources) within the same symbol, the patent enables simultaneous multi-beam transmission while preventing harmful interference through the mediating orthogonal resource structure.
Solution Approach 2:
The patent resolves interference by transitioning to another dimension for resource separation. Instead of separating beams only in time or frequency, it utilizes multiple dimensions simultaneously (time-frequency resources, cyclic shift dimensions, orthogonal cover dimensions) to allocate multiple CSI-RS resources in a single symbol, achieving high transmission efficiency while maintaining orthogonality and preventing interference through multi-dimensional resource separation.
Data Source
AI summary
Provided is an apparatus and method for beam management based on a channel state indicator (CSI)-reference signal (RS). A method for a user equipment (UE) to receive a CSI-RS from a base station (BS) includes receiving configuration information of a CSI-RS resource set including one or more CSI-RS resources, and receiving a CSI-RS from a BS through CSI-RS resources included in the CSI-RS resource set. The configuration information of the CSI-RS resource set includes indication information indicating beam configurations for the respective CSI-RS resources included in the CSI-RS resource set.