Identifier Response Timing Windows for Collision-Aware Backscatter

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Solution Overview

Problem

UHF RFID systems face inefficiencies due to poor timing ability in identifiers, leading to increased power consumption, overhead, and collisions in NR systems, which are not compatible with passive IoT devices using backscatter communication.

Innovation Solution

Implementing a time domain window divided into equal duration sub-windows with guard time durations to manage identifier responses, reducing the need for repeated synchronization signals and minimizing collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If identifiers transmit responses without structured time domain windows, then communication flexibility is maintained, but collisions between responses increase and timing accuracy deteriorates

Engineering Contradiction:

Improvetiming accuracyVSAvoidcollision rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The time domain window is segmented into multiple equal-duration sub-windows, with each sub-window assigned to specific identifiers. This segmentation structure organizes response transmissions in distinct time slots, preventing collisions between identifiers while maintaining systematic communication flow.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically assigns identifiers to specific sub-windows based on communication needs. The time domain window structure allows flexible allocation and reassignment of sub-windows to different identifiers, enabling adaptive response management while preventing collisions through structured timing.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If synchronization signals are transmitted repeatedly to maintain timing, then timing accuracy is improved, but power consumption and overhead increase

Engineering Contradiction:

Improvetiming accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Synchronization signals are transmitted in advance to establish the time domain window structure and sub-window assignments before identifier responses occur. This preliminary synchronization enables identifiers to transmit responses at predetermined times without requiring continuous synchronization signal transmissions, reducing power consumption while maintaining timing accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses periodic time domain windows with predetermined sub-window structures instead of continuous synchronization signaling. Identifiers transmit responses at regular, predetermined intervals within the structured windows, eliminating the need for repeated synchronization signals while maintaining timing coordination.

Inventive Principle:

Principle #19Periodic action

3Ease of operation

If identifiers transmit responses simultaneously without time domain structure, then communication simplicity is maintained, but collisions increase and system efficiency decreases

Engineering Contradiction:

Improvecommunication simplicityVSAvoidsystem efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the time domain parameter by introducing structured windows with specific sub-window assignments. Instead of allowing simultaneous transmissions, identifiers transmit responses in designated time slots defined by the window structure, preventing collisions while maintaining organized communication.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250365711A1Communication timing for identifiers

Publication Date: 2025.11.27 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a signal indicating a quantity of identifiers, each indicated identifier to transmit a response during a time domain window. The time domain window may include a quantity of sub-windows, where each sub-window is of equal duration. The UE may receive, from each identifier of the quantity of identifiers, a response in each sub-window, based on transmitting the signal. The time domain window may also include one or more guard time durations.