IC Card Switch Control for Dual Communication Paths
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Solution Overview
Problem
IC Cards are limited to communicating only with the read-write device they are powered by, as they can only use the I/O contact pad for data transmission, restricting their ability to establish secondary communications with other devices without modifying the ISO 7816-3 protocol.
Innovation Solution
An IC Card with a microprocessor, memory unit, and an I/O contact pad for primary communication with a read-write device, along with an additional device connected via a secondary interconnection and a switch control to selectively switch between primary and secondary data transmissions, allowing communication with additional devices without interrupting the ISO 7816-3 protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IC Card uses the I/O contact pad for primary communication with the read-write device according to ISO 7816-3 protocol, then the communication reliability with the read-write device is ensured, but the IC Card cannot establish secondary communication with additional devices
Solution Approach 1:
The patent implements a dynamic switching mechanism that allows the I/O contact pad to be selectively connected to either the main device or the additional device based on communication needs. The switch control dynamically reconfigures the communication path, enabling the system to adapt between primary ISO 7816-3 communication and secondary communication modes without compromising either function's reliability when activated.
Solution Approach 2:
The I/O contact pad is designed to serve multiple functions: it can be used for primary communication with the read-write device according to ISO 7816-3 protocol, or for secondary communication with additional devices. The switch control enables this multi-functionality by routing the contact pad to the appropriate device based on the active communication mode, making a single component perform multiple roles.
2Adaptability or versatility
If the IC Card establishes secondary communication with additional devices, then the communication versatility is improved, but the primary communication with the read-write device is interrupted
Solution Approach 1:
The switch control dynamically manages the I/O contact pad allocation, switching between main device and additional device connections based on communication priority and timing. This dynamic control prevents simultaneous conflicts and ensures that secondary communication with additional devices does not permanently interrupt primary communication capabilities.
Solution Approach 2:
The communication system operates in periodic cycles, alternating between primary ISO 7816-3 communication modes and secondary communication modes. The switch control implements periodic switching that allows both communication channels to function at different times, ensuring data transmission continuity across the entire system while enabling versatile communication options.
3Adaptability or versatility
If the I/O contact pad is used for both primary and secondary communication simultaneously, then the communication versatility is improved, but the ISO 7816-3 protocol is damaged
Solution Approach 1:
The switch control implements dynamic time-division multiplexing, where the I/O contact pad is exclusively assigned to either the main device or the additional device at any given moment. This dynamic switching ensures that the ISO 7816-3 protocol is never compromised by simultaneous conflicting access, while still enabling dual communication capabilities through sequential operation.
Solution Approach 2:
The switch control acts as an intermediary device that manages access to the I/O contact pad. It mediates between the main device and the additional device, ensuring that only one device communicates with the contact pad at a time. This intermediary function protects the integrity of the ISO 7816-3 protocol while enabling versatile communication through controlled access.
Data Source
AI summary
The IC Card includes a main device having a microprocessor and a memory unit, and an I/O contact pad for a connection between the main device and a read write device, also referred to as a main interconnection. The IC card also includes additional device connectable to the main device via a secondary interconnection including the I/O contact pad, and a switch control for selectively switching between the main interconnection, for a transmission of data between the read write device and the main device, and the secondary interconnection, for a transmission of data between the main device and the additional device.