CSI-RS Resource Element Multiplexing for Interference Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In high-frequency wireless communication systems, phase noise and beam switching cause interference between CSI-RSs, leading to inaccurate channel estimation and reduced signal quality.

Innovation Solution

The method involves determining a plurality of resource elements to carry a CSI-RS, where the CSI-RS values on at least two resource elements are different, and using a multiplex code to load these values, thereby increasing the sequence length of the CSI-RS in each symbol and reducing correlation between sequences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If CSI-RSs from multiple network devices use the same time-frequency resource and multiplex code, then resource utilization is improved, but correlation between sequences increases causing interference

Engineering Contradiction:

Improveresource utilizationVSAvoidinterference between CSI-RSs

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the sequence by introducing a first portion and a second portion, where the first portion is common across network devices but the second portion is device-specific. This segmentation allows resource efficiency while reducing correlation through the device-specific second portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making the second portion of the sequence unique to each network device while keeping the first portion common. This creates local differentiation in the sequence structure that reduces correlation and interference between devices using the same resources.

Inventive Principle:

Principle #3Local quality

2Reliability

If sequence length of CSI-RS is increased, then correlation between sequences is reduced, but time consumption increases

Engineering Contradiction:

Improvecorrelation reductionVSAvoidtime consumption

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

By segmenting the sequence into a common first portion and device-specific second portion, the patent achieves reduced correlation through the second portion without requiring the entire sequence to be long. The first portion can be processed efficiently while the second portion provides the necessary differentiation.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12328270B2Reference signal sending method, reference signal receiving method, network device, and terminal device

Publication Date: 2025.06.10 HUAWEI TECH CO LTD

AI summary

A reference signal sending or receiving method includes: determining, by the network device, a plurality of resource elements REs used to carry a first CSI-RS, where the plurality of REs are distributed in a plurality of resource units, and in each resource unit, a plurality of REs used to carry the first CSI-RS are located on a plurality of subcarriers in a same symbol, values of the first CSI-RS carried on at least two REs are different, and values of the first CSI-RS are loaded to the plurality of REs in the resource unit by using a first multiplex code; and sending, by the network device, the first CSI-RS to the terminal device by using the plurality of REs.