name: SGi-mb
full_form: Service Gateway for multimedia broadcast
context: Figure 20.3.4.1: MBMS session termination
  1.	In exceptional cases (e.g. resource pre-emption or timeout of the MBMS session), the MBMS GW may send an STRÂ command to the BM-SC to initiate the termination of the Diameter session related to an MBMS bearer service. If a bearer plane had been established over SGi-mb for this MBMS bearer service, the bearer plane is released. If the MBMS GW detects the SGi-mb path failure as specified in subclause 20.3.2.1 of 3GPP TSÂ 23.007Â [104], the MBMS GW shall set the Termination-Cause to "DIAMETER_LINK_BROKEN" (see IETFÂ RFCÂ 6733Â [111]) and shall include the Diagnostic-Info AVP set to "User Plane Failure" if it tears down the MBMS session as a result of detecting an SGi-mb path failure.
  2.	The BM-SC removes the Diameter session and confirms the operation by sending an STA message to the MBMS GW.
description: The SGi-mb interface is used to establish bearer planes for MBMS services. It enables the transmission of multimedia content between network functions.
explanation: Categorized as an Interface because it facilitates communication and data transfer between network components.
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