Smart Card Active State Retention via Waiting Time Extension

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Solution Overview

Problem

Smart cards face inefficiencies when re-entering an electromagnetic field, as they need to interact with electronic devices to switch states, which is time-consuming and complex.

Innovation Solution

The smart card sends a waiting time extension instruction to the electronic device before leaving the field, allowing it to remain in an active state using its built-in power supply until re-entry, eliminating the need for subsequent state switching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the smart card interacts with the electronic device to switch states when re-entering the field, then the communication protocol is followed correctly, but the time consumption increases and efficiency decreases

Engineering Contradiction:

Improvecommunication protocol complianceVSAvoidtime for state switching

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The smart card sends a waiting time extension instruction to the electronic device before leaving the field, preliminarily establishing an agreement that allows the card to remain in active state without subsequent interaction when re-entering the field. This preliminary action eliminates the need for state switching interactions upon re-entry, reducing time loss while maintaining protocol compliance.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the smart card uses the electromagnetic field to power itself, then energy efficiency is improved, but the card cannot maintain active state when outside the field

Engineering Contradiction:

Improveenergy efficiencyVSAvoidduration of active state

Core Design Contradiction:

Use of energy by moving objectVSDuration of action of stationary object

Solution Approach 1:

Before leaving the field, the smart card preliminarily agreements with the electronic device through the waiting time extension instruction, establishing that the card will remain in active state upon re-entry. This allows the card to efficiently use electromagnetic field energy when available while maintaining active state when outside the field, resolving the contradiction between energy efficiency and active state duration.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the smart card re-enters the field frequently, then communication operations can be performed, but the repeated state switching increases complexity and reduces efficiency

Engineering Contradiction:

Improvecommunication capabilityVSAvoidcommunication process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The waiting time extension instruction preliminarily establishes an agreement between the smart card and electronic device, allowing the card to maintain active state across multiple field entries. This eliminates repeated state switching interactions, reducing communication process complexity while maintaining full communication capability for frequent field entries.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If the smart card interacts with the electronic device upon re-entering the field, then the state is properly updated, but the overall system efficiency decreases

Engineering Contradiction:

Improvestate managementVSAvoidre-entry efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The smart card sends a waiting time extension instruction to the electronic device before leaving the field, preliminarily establishing an agreement that allows the card to remain in active state without subsequent interaction when re-entering the field. This preliminary action maintains reliable state management while significantly improving re-entry efficiency by eliminating repeated state switching interactions.

Inventive Principle:

Principle #10Preliminary 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 simplifies communication processes and saves time when re-entering the field, improving efficiency by maintaining the active state during the waiting duration.

Implementation Method 1

the smart card can be in an electromagnetic field of the electronic device, and can acquire energy from the electromagnetic field of the electronic device

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP3404585B1Method for keeping working state of smart card entering field again, and smart card

Publication Date: 2022.03.02 TENDYRON CORP

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AI summary

A method for keeping a working state of a smart card entering a field again, and the smart card. The method comprises: when a smart card is in an electromagnetic field of an electronic device and is activated, send a waiting time extension instruction to an electronic device, the waiting time extension instruction at least comprising a preset waiting duration (S201); after the smart card receives a response to the waiting time extension instruction returned by the electronic device, start a timer, a timing time of the timer being a preset waiting duration (S202); when the smart card detects that the smart card leaves the field, determining whether the timer times out; and if not, keep the current state of the smart card to be an activation state, a built-in power supply of the smart card supplies power to the smart card when the smart card leaves the field (S203); and when the smart card enters the field again, determine whether the timer times out; and if not, keep the current state of the smart card to be an activation state (S204).