DMRS CSI-RS Frequency Division Multiplexing in Wireless Systems

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently multiplexing demodulation reference signals (DMRS) and channel state information-reference signals (CSI-RS) or sounding reference signals (SRS), which hinders resource utilization and performance in next-generation mobile communication systems requiring high data transfer rates and low latency.

Innovation Solution

The implementation of frequency division multiplexing (FDM) between DMRS and CSI-RS or SRS, allowing for efficient resource allocation and management in wireless communication systems, particularly in the context of New Radio (NR) systems, by configuring specific patterns and positions for these signals within the same symbol.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency division multiplexing is implemented between DMRS and CSI-RS/SRS, then resource efficiency is improved, but system complexity increases

Engineering Contradiction:

Improveresource efficiencyVSAvoidmultiplexing configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The frequency spectrum is segmented into different regions, with specific subcarriers allocated for DMRS and other reference signals (CSI-RS or SRS). This segmentation allows both signal types to coexist in the same time resource without interference, improving overall resource utilization efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces frequency domain multiplexing as an additional dimension to time domain resource allocation. By utilizing frequency division multiplexing, the system can transmit multiple reference signals simultaneously in different frequency regions, effectively increasing resource efficiency without requiring additional time resources.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Speed

If frequency division multiplexing is used for DMRS and CSI-RS/SRS, then data transfer rate is improved, but signal interference may increase

Engineering Contradiction:

Improvedata transfer rateVSAvoidsignal interference

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

Different frequency regions are assigned different qualities or characteristics for specific signal types. The DMRS occupies specific frequency resources optimized for demodulation, while CSI-RS or SRS occupies other frequency resources optimized for channel state estimation or sounding, allowing each signal to have its optimal local characteristics without mutual interference.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3657719B1Method for multiplexing between reference signals in wireless communication system, and apparatus for same

Publication Date: 2023.11.01 LG ELECTRONICS INC

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AI summary

The present specification provides a method for multiplexing a demodulation reference signal (DMRS) and a channel state information-reference signal (CSI-RS) in a wireless communication system. Specifically, a method performed by a terminal may comprise the steps of: receiving a DMRS from a base station; and receiving a CSI-RS from the base station, wherein frequency-division multiplexing (FDM) between the DMRS and the CSI-RS in a particular symbol is determined on the basis of a DMRS type.