name: F1-U
full_form: F1 User plane interface
context: Figure 8.14.10.2-1: Multicast Distribution Setup procedure: Successful Operation The gNB-DU initiates the procedure by sending MULTICAST DISTRIBUTION SETUP REQUEST message to the gNB-CU. If the gNB-CU succeeds to establish the multicast context, it replies to the gNB-DU with MULTICAST DISTRIBUTION SETUP RESPONSE. The MULTICAST DISTRIBUTION SETUP REQUEST message shall contain F1-U TNL information for the MRBs accepted for the MBS Session by the gNB-DU and indicate in the MBS Multicast F1-U Context Descriptor IE, if the shared F1-U tunnel(s) for the MRB(s) are established on a per NR CGI or per MBS Area Session ID basis or for a ptp MRB leg. Upon reception of the MULTICAST DISTRIBUTION SETUP REQUEST message the gNB-CU shall allocate F1-U resources and reply accordingly to the gNB-DU in the MULTICAST DISTRIBUTION SETUP RESPONSE message. If the MC F1-U Context usage IE in the MBS Multicast F1-U Context Descriptor IE is set to "ptp forwarding" the gNB-CU shall, if supported, use the MRB
description: The F1 User plane interface (F1-U) is a reference point between the gNB-DU and gNB-CU for user plane data transmission in the 5G Next Generation Radio Access Network (NG-RAN). It enables the exchange of user plane data, including multicast distribution setup requests and responses.
explanation: The context explicitly mentions F1-U as an interface used by the gNB-DU and gNB-CU for exchanging user plane information, specifically for setting up multicast distributions. This indicates that F1-U is a communication pathway between network functions, fitting the definition of an Interface.
section_title: 8.14.10.2Successful Operation
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