name: USSD
full_form: Unstructured Supplementary Service Data
context: The user checks that the ussd string sent by the SS is correctly displayed by the UE and answers the request using appropriate MMI/AT commands. Then the UE sends a FACILITY message with ussd string exactly containing the digits and symbols contained in AT/MMI commands. - Then the SS originates a call to the UE. When the UE is in the U10 state, the SS releases the transaction identifier concerning USSD transaction by sending a RELEASE COMPLETE. The SS initiates a new ussd transaction by sending a REGISTER message containing a facility information element with operation code set to UnstructuredSS-Request. The user checks that the ussd string sent by the SS is correctly displayed by the UE and answers the request using appropriate MMI/AT commands. Then the UE has to send a FACILITY message with ussd string exactly containing the digits and symbols expressed on the mobile equipment keypad. Finally the SS releases both MM connections and the radio link. Expected sequence Specific message
description: Unstructured Supplementary Service Data (USSD) is a service that enables users to interact with applications and services using a simple, text-based interface on their mobile devices. It allows users to send and receive information, such as balance inquiries or notifications, without the need for internet connectivity.
explanation: USSD facilitates communication between users and applications/services via text commands, enabling functionalities like information retrieval and updates, which are characteristic of telecommunications services.
section_title: 15.9.5UnstructuredSS-Request/accepted
biotag_Context: O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,B-Interface,I-Interface,O,O,O,O,O,O,O,O
biotag_Description: B-Service,I-Service,I-Service,I-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O