RF Sensing Reference Signal Timing for Accurate Doppler Estimation

Solution Overview

Problem

Existing wireless communication systems face challenges in achieving high spectrum efficiency while maintaining accurate speed estimation of targets through RF sensing, particularly in scenarios requiring long observation windows and high Doppler granularity.

Innovation Solution

Implementing non-uniform time domain resource allocation for RF sensing, utilizing non-uniform pulse repetition frequency (PRF) to enhance spectrum and power efficiency while maintaining high resolution speed estimations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If uniform time domain resource allocation is used for sensing reference signals, then implementation is simple, but spectrum efficiency is low and phase discontinuities occur

Engineering Contradiction:

Improveresource allocation implementationVSAvoidspectrum efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent implements dynamic time domain resource allocation where the time domain position of sensing reference signals is determined based on communication signal parameters. The time domain offset is calculated as a function of subcarrier spacing and cyclic prefix configuration, allowing the sensing resources to adapt dynamically to different communication scenarios rather than using fixed uniform allocation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the allocation parameters by deriving time domain positions from communication signal parameters (subcarrier spacing, cyclic prefix length) rather than using fixed uniform intervals. This parameter transformation enables the sensing reference signals to be positioned optimally for both spectrum efficiency and phase continuity while maintaining implementation feasibility through standardized parameter relationships

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If uniform time domain resource allocation is used, then resource distribution is simple, but speed estimation accuracy deteriorates

Engineering Contradiction:

Improveresource allocation structureVSAvoidspeed estimation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements dynamic time domain resource allocation where the time domain position of sensing reference signals is determined based on communication signal parameters. The time domain offset is calculated as a function of subcarrier spacing and cyclic prefix configuration, allowing the sensing resources to adapt dynamically to different communication scenarios rather than using fixed uniform allocation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the allocation parameters by deriving time domain positions from communication signal parameters (subcarrier spacing, cyclic prefix length) rather than using fixed uniform intervals. This parameter transformation enables the sensing reference signals to be positioned optimally for both spectrum efficiency and phase continuity while maintaining implementation feasibility through standardized parameter relationships

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If larger bandwidths are allocated for wireless cellular communications, then more use cases are supported, but spectral efficiency decreases without non-uniform resource allocation

Engineering Contradiction:

Improveuse case supportVSAvoidspectral efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies local quality by allocating sensing reference signal resources differently in different time domain locations based on local communication conditions. Instead of uniform allocation, the time domain offset is determined locally for each sensing resource set based on the specific subcarrier spacing and cyclic prefix configuration, optimizing resource usage in each local context

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic time domain resource allocation where the time domain position of sensing reference signals is determined based on communication signal parameters. The time domain offset is calculated as a function of subcarrier spacing and cyclic prefix configuration, allowing the sensing resources to adapt dynamically to different communication scenarios rather than using fixed uniform allocation

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12615626B2Non-uniform time domain resource allocation for radio frequency (RF) sensing in cellular systems

Publication Date: 2026.04.28 QUALCOMM INC

AI summary

Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. In one illustrative example, a network device can transmit, to a network entity, a capability report comprising a capability of the network device to support non-uniform time domain resource allocation of sensing reference signals (RSs). The network device can receive the sensing RSs for sensing one or more targets.