name: MBSTF
full_form: Multicast/Broadcast Service Transport Function
context: This solution addresses both KI#2 and KI#3. It is based on the converged architecture in TR 23.757 [2] which is concluded as the adopted architecture for 5G MBS. According to TR 23.757 [2], in the adopted architecture, the MBSTF (Multicast Broadcast Service Transport Function ) and MBSF(Multicast Broadcast Service Function ) are two functional components introduced at Service Layer. MBSTF is the media anchor for MBS data, performs generic packet transport functionalities such as framing, packet encoding, etc. MBSF provides service level functionality to support MBS, interacts with AF and MB-SMF for session operations and transport, controls MBSTF, and etc. Both MBSTF and MBSF belong to the operator domain. In this solution, the MBS traffic is protected between the MBSTF and the UE, and the protection is transparent to the content provider. MBS Traffic Key (MTK) is generated by MBSF and securely distributed to the MBSTF and the UEs through the control plane. MBSTF uses the MTK to
description: The Multicast/Broadcast Service Transport Function (MBSTF) is a network component responsible for performing generic packet transport functionalities, such as framing and packet encoding, for multicast/broadcast services in the 5G core network. It acts as a media anchor for MBS data and operates under the control of the Multicast Broadcast Service Function (MBSF).
explanation: MBSTF is classified as a Network Function because it performs specific tasks related to data transport within the 5G network, particularly for multicast/broadcast services. Its functionalities, like framing and packet encoding, are typical of network functions.
section_title: 6.3.1	Solution overview
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