Question: In a UICC-terminal interface supporting Inter-Chip USB, how are APDU commands and responses transmitted over USB for 3GPP applications?
Option 1: Encapsulated in TPDU as per ETSI TS 102 221, then transmitted over USB.
Option 2: Transmitted as plain text without any encapsulation to ensure compatibility.
Option 3: Directly encapsulated as C-APDU and R-APDU at the application layer for transmission.
Option 4: Converted into HTTP requests for transmission over the USB interface.
Explanation: For UICC applications running over Inter-Chip USB, APDU commands and responses are directly encapsulated as C-APDU (Command APDU) and R-APDU (Response APDU) at the application layer. This method ensures efficient transmission of APDU-level exchanges without requiring additional mapping.