Channel State Information Determination Using Demodulation Reference Signals
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Solution Overview
Problem
Current channel state information (CSI) reporting in 5G wireless communication systems is inefficient, leading to high overhead and latency, which affects data traffic channel resources and delays sensitive applications like URLLC and mission-critical services, as existing methods rely heavily on periodic CSI-RS and cannot capture instantaneous channel variations.
Innovation Solution
The system determines CSI using scheduled PDSCH and DM-RS, allowing for efficient CSI computation and reporting, reducing overhead and enabling the UE to compute CQI, PMI, and RI during PDSCH decoding, thereby updating channel estimates in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic CSI-RS is used for channel state information reporting, then channel estimation can be performed, but signaling overhead increases and latency is introduced
Solution Approach 1:
The patent extracts the channel state information determination from the periodic CSI-RS framework and relocates it to the PDSCH decoding process. By computing CSI during PDSCH decoding using DM-RS, the system eliminates the need for separate periodic CSI-RS measurements, thereby reducing signaling overhead and reporting latency while maintaining channel estimation accuracy.
Solution Approach 2:
The patent merges the channel state information determination function with the PDSCH decoding process. Instead of performing CSI measurement separately through periodic CSI-RS, the system combines CSI computation with the existing PDSCH decoding operations, utilizing the same received signals and processing resources to achieve both data decoding and channel state estimation simultaneously.
2Measurement precision
If periodic CSI-RS is used for channel state information reporting, then channel quality can be assessed, but data traffic channel resources are reduced
Solution Approach 1:
The patent makes the DM-RS serve multiple functions: it acts as both the demodulation reference signal for PDSCH and the channel state information reference signal. This multi-functional approach eliminates the need for separate CSI-RS resources, thereby increasing the availability of data traffic channel resources while maintaining accurate channel quality assessment capabilities.
Solution Approach 2:
The patent extracts the CSI measurement function from the periodic CSI-RS framework and integrates it into the PDSCH decoding process. By doing so, the system eliminates dedicated CSI-RS resource allocations and repurposes the existing PDSCH and DM-RS resources for dual purposes: data transmission and channel state estimation.
3Loss of information
If periodic CSI-RS is used for channel state information reporting, then channel information can be obtained, but system complexity increases
Solution Approach 1:
The patent merges the CSI determination process with PDSCH decoding operations. By computing CSI during the same processing cycle as data decoding and utilizing the same received signals and algorithmic steps, the system reduces the need for separate CSI measurement and reporting infrastructure, thereby simplifying the overall system complexity while ensuring continuous channel information availability.
Data Source
AI summary
Facilitating channel state information determination using demodulation reference signals in advanced networks (e.g., 4G, 5G, and beyond) is provided herein. Operations of a system can comprise communicating first channel state information to a network device of a communication network. The first channel state information can be determined based on a received reference signal. The operations can also comprise determining second channel state information based on a scheduled demodulation reference signal received from the network device and comprising determining a precoding matrix index, rank information, and channel quality index information. Further, the operations can comprise communicating the second channel state information to the network device.