name: Mz
full_form: Multicast Interface for Roaming Scenarios
context: 3GPP TSÂ 23.246Â [65] specifies that when MBMS bearers are used to provide MBMS user services to roaming users, three specific scenarios are used.
  One uses a GGSN in the Home PLMN, which is not related to Mz interface. The other two are enabled by use of the Mz interface for multicast services and are further described below.
  Mz is the roaming variant of the Gmb reference point with the same functionality as decribed under Gmb, i.e. with MBMS bearer and user specific signalling. The support of Mz with in BM-SC is needed for MBMS roaming scenario. Mz interface is defined between the visited BM-SC and the home BM-SC.
  MBMS bearer and user specific Mz signalling is used between a BM-SC in the visited PLMN and a BM-SC in the home PLMN when MBMS services from the home PLMN are offered by the visited PLMN.
  User specific signalling is used between a BM-SC in the visited PLMN and a BM-SC in the home PLMN when the visited PLMN offers MBMS user service to roaming users. This user specifice Mz signalling provides home PLMN authorisation for MBMS user service that are provided by the visited PLMN.
  Mz may use proxy capabilities as described for Gmb, e.g. to proxy signalling between BM-SCs.
description: The Mz interface is the roaming variant of the Gmb reference point, enabling multicast services and providing MBMS bearer and user-specific signaling between BM-SCs in different PLMNs.
explanation: Categorized as an Interface since it enables communication between BM-SCs for MBMS roaming scenarios.
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biotag_Description: O,B-Interface,O,O,O,O,O,O,O,B-Interface,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O