Distributed MIMO CSI Acquisition with Segmented Reference Signals
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently acquiring channel state information (CSI) in distributed MIMO transmitters/receivers, which affects data transmission quality and efficiency.
Innovation Solution
A UE determines that reference signals are transmitted from L antenna ports of a base station on specific time-frequency resources, receives these signals at different groups of physical antennas on separate time-frequency resources, and generates CSI reports based on channel state measurements derived from these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE receives reference signals from L antenna ports using traditional single-time-frequency resource methods, then the CSI acquisition is simplified, but the data transmission quality and efficiency in distributed MIMO systems deteriorates
Solution Approach 1:
The patent segments the reference signal reception process into multiple groups of physical antennas, where each group receives reference signals from a subset of antenna ports. This segmentation allows the UE to acquire CSI for distributed MIMO systems by processing signals in manageable portions across different time-frequency resources, thereby improving transmission efficiency without overwhelming complexity.
Solution Approach 2:
The patent introduces a new dimension by mapping reference signals from L antenna ports to multiple groups of physical antennas across different time-frequency resources. This dimensional transformation enables the UE to capture spatial information from distributed MIMO antennas through multiple reception paths, enhancing CSI acquisition quality and data transmission efficiency simultaneously.
2Measurement precision
If the UE uses multiple groups of physical antennas on separate time-frequency resources to receive reference signals, then the channel state measurement precision improves, but the signal processing complexity increases
Solution Approach 1:
The patent divides the reference signal reception into multiple segments, with each segment corresponding to a specific group of physical antennas receiving signals from a subset of antenna ports. This segmentation enables precise channel state measurement for each antenna group while maintaining manageable signal processing complexity through structured processing of discrete signal segments.
Solution Approach 2:
The patent introduces time-frequency resources as intermediary elements that map reference signals from the base station's antenna ports to the UE's physical antennas. This intermediary framework organizes the complex multi-antenna signal processing into structured transformations, enabling precise channel state measurement while simplifying the detection and measurement process through standardized mapping relationships.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines that reference signals are transmitted from L antenna ports of a base station on reference time-frequency resources. The UE receives first RF signals at Nr1 physical antennas on first time-frequency resources. The first RF signals carries the reference signals. Nr1 and L are positive integers. Nr1 is less than L. The UE receives second RF signals at Nr2 physical antennas on second time-frequency resources. The second RF signals carries the reference signals. Nr2 is a positive integer and less than L. The UE obtains channel state measurements corresponding to the reference signals based on baseband signals derived from the first RF signals and the second RF signals. The UE generates a CSI report based on the channel state measurements.