N.2 Application Mode

31.1113GPPRelease 18TSUniversal Subscriber Identity Module (USIM) Application Toolkit (USAT)

Mobile initiated USSD operation, Network does not request further information

Network	ME		UICC
		SEND USSD
		
		ussd-DCS(8 bits), ussd-String

REGISTER

Facility (Invoke = ProcessUnstructuredSS-Request (ussd-DCS, ussd-String))
		TERMINAL RESPONSE
		
		DCS, text string data object
Release Complete

Facility (Return result = ProcessUnstructuredSS-Request (ussd-DCS, ussd-String))

		ENVELOPE(USSD Data Download)
		
		ussd-DCS, ussd-String

Figure N.3

Mobile initiated USSD operation, Network requests further information

Network	ME		UICC
		SEND USSD
		
		ussd-DCS(8 bits), ussd-String

REGISTER

Facility (Invoke = ProcessUnstructuredSS-Request (ussd-DCS, ussd-String))
		TERMINAL RESPONSE
		
		DCS, text string data object
FACILITY

Facility (Invoke = UnstructuredSS-Request (ussd-DCS, ussd-String))

		ENVELOPE(USSD Data Download)
		
		ussd-DCS, ussd-String



		SEND USSD
		
		ussd-DCS, ussd-String

FACILITY

Facility (Return result = UnstructuredSS-Request (ussd-DCS, ussd-String))
		TERMINAL RESPONSE
		
		DCS, text string data object
Release Complete

Facility (Return result = ProcessUnstructuredSS-Request (ussd-DCS, ussd-String))
		ENVELOPE(USSD Data Download)
		
		ussd-DCS, ussd-String

Figure N.4