IC Card Passive to Active Mode Switching via Reader Intermediary
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Solution Overview
Problem
IC cards face increased processing time when switching from a passive to an active mode due to the need for collision avoidance and initial setting with other IC cards within their communicable range, which complicates data transmission and reception.
Innovation Solution
An IC card with a receiver, determining processor, switching processor, identification information acquiring processor, command generating processor, and command transmitter allows for smooth switching from a passive to an active mode, enabling efficient communication and reducing processing time by acquiring and transmitting identification information to manage multiple IC cards within the communicable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IC card switches to an active device mode, then the IC card can perform active communication and data transmission, but the processing time increases due to collision avoiding processing and initial setting
Solution Approach 1:
The patent applies preliminary action by performing initial setting and collision avoiding processing during the card selection phase, before the actual active device mode operation begins. The reader/writer executes anticollision processing and initial setting commands (such as SELECT AFD or SELECT DF) to establish communication parameters and identify the target IC card in advance, so that when the IC card switches to active mode, the communication channel is already prepared and optimized, reducing the processing time required for actual data transmission operations
2Reliability
If the IC card performs collision avoiding processing and initial setting, then the IC card can detect other IC cards in communicable range, but the communication complexity increases
Solution Approach 1:
The patent employs the reader/writer as an intermediary that manages and coordinates the collision avoiding processing and initial setting procedures. Instead of requiring the IC card to independently perform complex detection and coordination with multiple other cards, the reader/writer executes standardized anticollision algorithms (such as binary tree search or time-division multiplexing) and initial setting commands, simplifying the IC card's role to responding to reader-initiated procedures. This intermediary approach maintains reliable detection accuracy while reducing the communication complexity burden on the IC card itself
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 solution enables IC cards and portable electronic devices to switch modes efficiently, enhancing convenience by reducing processing time and facilitating seamless communication between IC cards and external devices.
Implementation Method 1
The IC card receives magnetic field outputted from a reader/writer of an IC card processing device which processes the IC card through the antenna within the IC card, and operates by electric power induced by electromagnetic induction.
Data Source
AI summary
An IC card of an embodiment is provided with a receiver to receive a first command transmitted from an external device, a determining processor to determine whether or not the first command is a switching request command to request switching the IC card from a passive mode to an active mode, a switching processor to switch oneself from the passive mode to the active mode, when the first command is the switching request command, an identification information acquiring processor to acquire identification information of other IC card existing in a communicable range of the external device from the switching request command, a command generating processor to generate a second command which includes the identification information acquired by the identification information acquiring processor so as to make the other IC card execute processing, and a command transmitter to transmit the second command to the other IC card.