SWP Microcircuit Card Power Management During Internal Procedures

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Solution Overview

Problem

Current microcircuit cards using the SWP interface lack a mechanism to ensure continuous power supply during internal operations, as the contactless communication module can deactivate the power supply between communication exchanges, leading to premature termination of internal procedures.

Innovation Solution

The microcircuit card prolongs the negotiation phase by sending RSET frames until the completion of internal procedures, ensuring the contactless communication module maintains power supply during initialization and negotiation phases, using a callback function and timer to manage the RSET frame transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the contactless communication module deactivates power supply between communication exchanges to save energy, then energy consumption is reduced, but internal procedures of the microcircuit card cannot be completed

Engineering Contradiction:

Improveenergy consumptionVSAvoidcompletion of internal procedures

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The microcircuit card detects the need to prolong power supply in advance during the negotiation phase, before internal procedures begin. By sending RSET frames during negotiation, the card proactively ensures power will be maintained throughout the subsequent internal operations, preventing premature termination

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The microcircuit card uses feedback mechanisms during the negotiation phase to communicate its power needs to the contactless communication module. Through RSET frame exchanges, the card provides feedback about its operational requirements, enabling the module to adjust power supply timing accordingly

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the microcircuit card waits for commands from the terminal to communicate, then communication follows master/slave protocol standards, but the card cannot initiate messages or operations

Engineering Contradiction:

Improvecommunication protocol compatibilityVSAvoidinitiative of card operations

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The invention inverts the typical master/slave dynamic by enabling the slave microcircuit card to initiate the power supply prolongation request during negotiation. Instead of passively waiting for terminal commands, the card actively sends RSET frames to control the timing of its own power supply, reversing the usual initiative hierarchy

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The system transitions from a static master/slave command structure to a dynamic interaction during the negotiation phase. The microcircuit card dynamically adjusts communication timing by sending RSET frames based on its internal procedure requirements, creating flexibility within the standardized protocol framework

Inventive Principle:

Principle #15Dynamics

3Productivity

If the negotiation phase is ended immediately after standard initialization, then communication setup is fast, but power supply is cut off before internal procedures complete

Engineering Contradiction:

Improvecommunication setup speedVSAvoidpower supply duration

Core Design Contradiction:

ProductivityVSDuration of action of moving object

Solution Approach 1:

The invention extends the useful action of the negotiation phase beyond standard initialization requirements. By maintaining power supply through the execution of internal procedures via RSET frame exchanges, the system ensures continuous operation without interruption, bridging the gap between initialization completion and procedure finish

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The negotiation phase performs more than the minimum required for standard initialization. The microcircuit card uses additional RSET frames to prolong power supply beyond what is strictly necessary for basic setup, ensuring sufficient time for internal procedures while still maintaining protocol compliance

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP2975775B1Method for establishing a communication session via an swp interface

Publication Date: 2017.05.24 OBERTHUR TECH SA

Figure 1~2
Figure 3~4A1
Figure 4A2

AI summary

This method, implemented by a microcircuit board, establishes a communication session between the microcircuit board and a contactless communication module via an SWP interface. The method comprises: - an initialization phase of the SWP interface; and - a negotiation phase (F120) between the microcircuit board (100) and the contactless communication module (200), the contactless communication module being capable of maintaining power to the microcircuit board during these phases. The method is notable in that the microcircuit board (100) extends the negotiation phase (F120) until the end (F300) of an internal procedure within the microcircuit board.