Identity-Driven Backscatter Resource Allocation for Positioning

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Solution Overview

Problem

Zero-power devices, such as RFID tags, experience interference when transmitting backscatter signals, which affects positioning accuracy due to multiple devices using the same resources, leading to challenges in reception and measurement performance.

Innovation Solution

Each zero-power device determines a time, frequency, spatial, or code domain resource for backscattering based on its identity, group identity, or received signaling to avoid interference, improving reception and measurement performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple zero-power devices transmit backscatter signals on the same resource, then deployment density and scale are improved, but interference between devices increases and positioning accuracy deteriorates

Engineering Contradiction:

Improvedeployment density of zero-power devicesVSAvoidpositioning accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent divides the backscatter resource pool into multiple orthogonal resources (time, frequency, spatial, code domains) and assigns different resources to different zero-power devices. This segmentation prevents interference by ensuring that devices transmit on distinct, non-overlapping resources while maintaining high deployment density.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces multiple resource dimensions (time domain, frequency domain, spatial domain, code domain) to resolve resource conflicts. By allocating resources across these dimensions, the system accommodates more devices without increasing interference, thus improving positioning accuracy while maintaining deployment scale.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If zero-power devices use simple backscatter transmission, then device complexity and cost are reduced, but resource coordination and interference management become more difficult

Engineering Contradiction:

Improvecomplexity of zero-power deviceVSAvoidresource coordination difficulty

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent enables zero-power devices to autonomously determine their backscatter resources by receiving configuration information and applying predetermined rules based on device identity. This self-service mechanism simplifies device complexity while effectively coordinating resources and managing interference without requiring complex centralized control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces configuration information as an intermediary that carries resource pool and allocation rule data from the network to zero-power devices. This intermediary enables simple devices to operate with proper resource coordination, resolving the contradiction between device simplicity and resource management complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If zero-power devices transmit continuously for positioning, then positioning measurement quality is improved, but interference and resource conflicts increase

Engineering Contradiction:

Improvebackscatter signal reception qualityVSAvoidinterference from multiple devices

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent implements periodic backscatter transmission where devices transmit at scheduled intervals rather than continuously. Configuration information includes timing parameters that coordinate these periodic transmissions across multiple devices, maintaining measurement quality while reducing interference through time-division separation.

Inventive Principle:

Principle #19Periodic action

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 enhances positioning accuracy by minimizing interference among zero-power devices, thereby improving the reception and measurement of backscatter signals.

Implementation Method 1

receiving, by a zero-power device, a carrier signal, where the carrier signal is used to be modulated to generate a backscatter signal for positioning; and transmitting, by the zero-power device, the backscatter signal on at least one resource

Methodology Applied

Scientific EffectBackscatter modulation:

Data Source

PatentUS20250294541A1Positioning methods and devices

Publication Date: 2025.09.18 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided in the embodiments of the present application are positioning methods and devices. A positioning method comprises: receiving, by a zero-power device, a carrier signal, wherein the carrier signal is used to be modulated to generate a backscatter signal for positioning; and transmitting, by the zero-power device, the backscatter signal on at least one resource, wherein the at least one resource is determined based on at least one of following: a target resource pool, identity information of the zero-power device, group identity information of the zero-power device, or first signalling received by the zero-power device.