RIM Reference Signal Phase Ramp for Disaggregated Base Station Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communications systems, particularly in those with disaggregated base stations, the generation and transmission of Remote Interference Management (RIM) Reference Signals (RS) require dedicated processing flows, leading to increased processor resources, code complexity, processing latency, and memory usage due to their unique time domain signal structure, which differs from traditional downlink signals.

Innovation Solution

Applying a phase ramp to the RS sequences allows for the transmission of RIM-RS using traditional downlink signal processing, enabling normal CP insertion and avoiding the need for dedicated processing flows, thus reducing processor resources and complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If dedicated processing flows are used for RIM-RS generation and transmission, then the unique time domain signal structure can be supported, but processor resources, code complexity, processing latency, and memory usage increase

Engineering Contradiction:

Improvesupport for unique time domain signal structureVSAvoidprocessor resources and code complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies a phase ramp (frequency domain function) to the RS sequence in the frequency domain before transmission. This parameter transformation in the frequency domain creates the desired circular time shift in the time domain after IFFT, enabling the unique RIM-RS time domain structure to be achieved through frequency domain parameter modification rather than dedicated time domain processing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces complex time domain signal processing operations with frequency domain processing. By performing the phase ramp operation in the frequency domain and using IFFT to convert to time domain, the system avoids the need for dedicated time domain processing flows, reducing processor resource requirements and code complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If dedicated processing flows are used for RIM-RS, then the unique time domain signal structure can be achieved, but processing latency increases

Engineering Contradiction:

Improveunique time domain signal structureVSAvoidprocessing latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The phase ramp is applied to the RS sequence in advance in the frequency domain before the IFFT operation. This preliminary frequency domain transformation prepares the signal so that the desired circular time shift is already embedded, eliminating the need for additional time domain processing steps and reducing overall processing latency

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If dedicated processing flows are used for RIM-RS, then the unique time domain signal structure can be supported, but memory usage increases

Engineering Contradiction:

Improveunique time domain signal structureVSAvoidmemory usage

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent substitutes frequency domain processing for time domain processing operations. By performing the phase ramp operation in the frequency domain and using IFFT to generate the time domain signal, the system avoids storing multiple intermediate time domain processing stages, thereby reducing memory requirements

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables transparent RIM-RS transmission without additional hardware resources or increased latency, allowing disaggregated base stations to support RIM-RS without specific design accommodations, thereby improving processing efficiency and reducing overhead.

Implementation Method 1

performing an inverse Fourier transform (IFT) on the modified copy of the first RS sequence to obtain a circularly time-shifted RS signal in the time domain

Methodology Applied

Scientific EffectFourier transform:

Data Source

PatentUS20240406047A1Radio unit remote interference management reference signal transmission

Publication Date: 2024.12.05 QUALCOMM INC

AI summary

Certain aspects of the present disclosure provide techniques for interference management reference signal (RS) transmission. An example method, performed at a first network entity, generally includes applying a frequency domain function to a first copy of a first reference signal (RS) sequence to obtain a modified first copy of the first RS sequence, and outputting, to a second network entity, frequency domain samples of the modified first copy of the first RS sequence and frequency domain samples of a second copy of the first RS sequence.