name: MBSF-U
full_form: MBSF User Plane
context: This solution addresses Key Issue 2&3 to support the secure MBS traffic delivery from context provider to multiple UEs through 5GS. In the agreed architecture in TR 23.757 [2], the MBSF-U (Multicast/Broadcast Service Function-User plane) is defined as a new entity to handle the payload part to cater for the service level functions and management. MBSF-C (Multicast/Broadcast Service Function-Control plane) is defined as a new entity to functionality to handle the control plane signalling. This solution protects the MBS traffic between the MBSF-U in the operator domain and the UE. It is independent to the protection in the application layer from the content provider. The keys for protection of MBS traffic are generated in the SMF. Afterwards, the keys are distributed to UEs and MBSF-U respectively. The UEs, which belongs to a multicast group, acquire the same keys in the MBSF-U. The keys can be updated in an efficient way.
description: The Multicast/Broadcast Service Function-User plane (MBSF-U) handles the payload part of multicast and broadcast services, catering to service level functions and management. It operates in the user plane and secures MBS traffic between the operator domain and user equipment.
explanation: The text explicitly states that MBSF-U is a 'network function' responsible for specific tasks within a network architecture.
section_title: 6.2.1	Solution overview
biotag_Context: O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,B-Specification,O,O,O,B-Network Function,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-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,B-Network Function,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-Service,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,B-Network Function,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
biotag_Description: O,B-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,B-Service,O,O,O,O,O,O,O,O