Extended CSI-RS Port Patterns for High-Density Channel Estimation
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Solution Overview
Problem
Existing CSI-RS port patterns are limited to 32 ports and cannot efficiently support quantities greater than 32, leading to decreased channel estimation performance due to lower port density and mismatched observations, which affects beamforming and spatial dimensions.
Innovation Solution
Extend CSI-RS port patterns by duplicating or adding CDM groups in the time domain and down-sampling in the frequency domain across resource blocks, ensuring consistent port observations and maintaining higher density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CSI-RS port patterns are extended to support more than 32 ports, then the quantity of supported ports increases, but the port density decreases leading to lower channel estimation performance
Solution Approach 1:
The patent extends CSI-RS port patterns by utilizing additional time-domain dimensions through CDM group extensions. Instead of only frequency-domain multiplexing which limits port density, the invention introduces time-domain resource allocation for CDM groups, effectively adding a temporal dimension to the port multiplexing scheme. This allows supporting more than 32 ports while maintaining adequate port density through proper time-frequency resource distribution.
Solution Approach 2:
The patent modifies the CDM group configuration parameters to support extended port quantities. By changing the number of CDM groups, the length of CDM sequences, and the time-frequency resource allocation parameters, the system can dynamically adapt to support different port quantities (e.g., 48, 64, or more ports) while optimizing channel estimation performance for each configuration.
2Quantity of substance
If CDM groups are extended in time domain to support more ports, then port quantity increases, but observation mismatch increases affecting estimation accuracy
Solution Approach 1:
The patent applies different time-domain extension strategies to different CDM groups based on their specific requirements. Each CDM group can be configured with appropriate time-extension factors and resource allocation patterns tailored to its position and function in the extended port pattern, ensuring optimal observation consistency for each group while supporting the overall increased port quantity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a network entity, an indication of a quantity of channel state information (CSI)-reference signal (RS) ports to be used by the network entity for transmission of a CSI-RS. The quantity of CSI-RS ports may be greater than 32 and have a first CSI-RS port pattern. The first CSI-RS port pattern may be an extension of a second CSI-RS port pattern for 32 or fewer CSI-RS ports. The extension may include an extension of code division multiplexing (CDM) groups of the second CSI-RS port pattern in a time domain and a down-sampling in a frequency domain of the CDM groups of the second CSI-RS port pattern across multiple resource blocks. The UE may receive the CSI-RS via the quantity of CSI-RS ports in accordance with the first CSI-RS port pattern and estimate a channel.