UWB Transaction Zone Ranging for Reliable Contactless Payments

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Solution Overview

Problem

Conventional NFC-based contactless payments require close proximity between devices, leading to errors due to improper placement or communication difficulties, making transactions inefficient.

Innovation Solution

Implementing Ultra-Wideband (UWB) ranging to calculate distance and angle of arrival (AoA) to determine if a device is within a transaction zone, enabling wireless transactions by confirming device orientation and location within a predefined range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If NFC-based contactless payments are used, then wireless transactions can be performed, but transaction efficiency deteriorates due to errors from improper placement and communication difficulties

Engineering Contradiction:

Improvetransaction efficiencyVSAvoidtransaction success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces NFC-based mechanical proximity coupling with UWB wireless ranging technology. The system uses UWB to calculate precise distance and angle of arrival, eliminating the need for close physical proximity and improving both transaction efficiency and success rate by enabling contactless payments at increased distances without placement errors

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces UWB ranging as an intermediary measurement system between the payer device and payee device. By using UWB to determine distance and AoA as intermediate parameters, the system can confirm device positioning and orientation before executing the transaction, thereby reducing communication errors and improving reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If close proximity is required for wireless transactions, then communication can be established, but device placement precision must be high to avoid errors

Engineering Contradiction:

Improvecommunication reliabilityVSAvoiddevice placement ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent substitutes the mechanical proximity requirement with UWB-based wireless positioning. Instead of requiring devices to be placed in close proximity for communication, the system uses UWB ranging to calculate distance and AoA, allowing transactions at increased distances while maintaining communication reliability through precise positional confirmation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements a feedback mechanism where the system continuously monitors distance and AoA during the transaction process. The system provides feedback to confirm that devices remain within the appropriate transaction zone and maintain proper orientation, allowing users to understand their device positioning status without requiring high placement precision initially

Inventive Principle:

Principle #23Feedback

3Measurement precision

If UWB ranging is performed to calculate distance and AoA, then transaction zone determination is accurate, but system complexity increases

Engineering Contradiction:

Improvedevice position accuracyVSAvoidranging system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent makes the UWB ranging system multi-functional by using the same distance and AoA measurements for multiple purposes: determining transaction zone eligibility, confirming device orientation, validating proximity during transaction execution, and providing user feedback. This universal use of ranging data justifies the system complexity through enhanced transaction reliability and precision across multiple operational phases

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

UWB technology enhances the efficiency of wireless transactions by accurately determining device positions, allowing contactless payments at increased distances and improving transaction success rates.

Implementation Method 1

calculating a distance between a first device and a second device

Methodology Applied

Scientific EffectTime of flight: Time of Flight

Implementation Method 2

calculating an angle of arrival (AoA) of the second device

Methodology Applied

Scientific EffectAngle of arrival:

Data Source

PatentUS12536540B2Methods and system for wireless transactions

Publication Date: 2026.01.27 NXP BV

AI summary

Embodiments of methods and a system for wireless transactions are disclosed. In an embodiment, the method includes performing multicast Ultra-Wideband (UWB) ranging, where the multicast UWB ranging includes calculating a distance between a first device and a second device, and calculating an angle of arrival (AoA) of the second device, determining, using the distance and the AoA, whether the second device is located in a transaction zone that is defined by the first device, exchanging wireless transaction information between the first device and the second device when the second device is located in the transaction zone, where the wireless transaction information includes a transaction request, and initiating a transaction upon the second device accepting the transaction request and upon confirming, using the distance and the AoA, that the second device is still located in the transaction zone, and the second device is oriented towards the first device.