Multi-IC Contactless Transponder Collision Management

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Solution Overview

Problem

Contactless transponders often experience communication collisions when multiple devices detect an external reader simultaneously, leading to data corruption, especially in applications where external readers do not handle collisions, prohibiting simultaneous communication of multiple transponders.

Innovation Solution

A contactless transponder device with multiple integrated circuits (ICs) is configured to inhibit or enable communication based on control inputs, allowing only one IC to respond to the external reader when collision handling is not supported, using a controller to manage the enable/disable states and store the previous state in memory to toggle between enable and disable states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple contactless transponders simultaneously respond to an external reader, then communication functionality is enhanced and versatility is improved, but communication collisions occur causing data corruption

Engineering Contradiction:

Improvecommunication functionalityVSAvoiddata integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies dynamics by making the transponder's communication state changeable through control inputs. The transponder can dynamically transition between enabled and disabled states based on collision detection and user input, allowing adaptive response to communication conditions rather than static operation

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback through collision detection mechanisms that monitor communication status and provide input signals to the controller. When collisions are detected, the system uses this feedback information to disable the transponder temporarily, creating a closed-loop control system that responds to real-time communication conditions

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If multiple ICs are enabled to respond to contactless fields, then functional versatility is improved, but device complexity increases due to coordination requirements

Engineering Contradiction:

Improvefunctional versatilityVSAvoidcoordination complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the contactless transponder into multiple independent ICs, each capable of performing specific functions (e.g., payment, automotive key, access control). This modular architecture allows functional versatility while managing complexity through independent, specialized components rather than a monolithic complex system

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements universality by designing a single transponder device that integrates multiple ICs capable of performing different functions. The controller coordinates these multi-functional ICs to provide diverse services (payment processing, automotive authentication, access control) within one unified device, eliminating the need for separate specialized devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If collision handling is not supported by the external reader, then compatibility with certain readers is improved, but simultaneous communication of multiple transponders is prohibited

Engineering Contradiction:

Improvereader compatibilityVSAvoidcommunication throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies partial action by having the transponder selectively enable or disable specific ICs based on the communication scenario. Rather than all ICs operating simultaneously (excessive action), the system enables only the necessary subset of ICs for each transaction type, optimizing compatibility with readers that don't support collision handling while maintaining efficient communication

Inventive Principle:

Principle #16Partial or excessive 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

Enables communication with external readers that do not handle collisions by ensuring only one contactless transponder communicates at a time, preventing data corruption and maintaining security through independent IC operations with varying security levels for different functions.

Implementation Method 1

A first IC includes a first contactless transponder interface circuit configured and arranged to respond to a contactless field by providing a first identifier of the first IC

Methodology Applied

Scientific EffectElectromagnetic field interaction: Electromagnetic Induction

Data Source

PatentUS8886119B2Coordinating multiple contactless data carriers

Publication Date: 2014.11.11 NXP BV

AI summary

A contactless transponder device is provided with multiple ICs. A first IC includes a first contactless transponder interface circuit configured and arranged to respond to a contactless field by providing a first identifier of the first IC. A second IC includes a second contactless transponder interface circuit configured and arranged to respond to the contactless field by providing a second identifier of the second IC. A controller is configured and arranged to inhibit the first IC from responding to the contactless field.