IC Card Extended Format Support Information Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Host devices cannot determine which commands support the extended format in IC cards, as IC cards only transmit information on whether the extended format is supported in general, not specifying which commands support it.
Innovation Solution
IC cards transmit extended format support information indicating whether the extended format is supported for each command group, allowing host devices to determine which commands can use the extended format based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If IC cards only transmit general extended format support information, then the communication protocol remains simple, but the host device cannot determine which specific commands support extended format
Solution Approach 1:
The extended format support information is segmented by command group, with each bit indicating support status for a specific command group. This allows detailed command-specific information transmission while maintaining a structured and manageable format.
Solution Approach 2:
The patent transitions from a single-bit general support indicator to an 8-bit detailed support information structure, adding a dimension of granularity that enables command-specific extended format support determination.
2Productivity
If host device uses extended format for all commands, then command response efficiency improves, but compatibility issues arise with IC cards that support extended format only for certain commands
Solution Approach 1:
The host device dynamically adjusts its command format based on the received extended format support information. The system transitions from a static format assumption to a dynamic format selection process that adapts to the specific IC card capabilities.
Solution Approach 2:
The patent changes the parameter of command format selection based on the extended format support information bits. Depending on the bit values received, the host device changes whether to use extended format or ordinary format for specific command groups.
Data Source
AI summary
According to an embodiment, an IC card includes a communication interface and a processor. The communication interface communicates with an IC card processing apparatus. The processor transmits extended format support information indicating whether an extended format is supported for each of commands to the IC card processing apparatus.