name: AAR
full_form: Access-Authorization Message
context: A visited PLMN may offer to roaming users MBMS user services from their home PLMN. For this case, the PDP connection, which will be used for the JOIN step, may be from the UE to the visited GGSN due to operator policy or routing optimization. Then the authorization is done in the BM-SC in visited PLMN with the authorization information retrieved from the BM-SC in home PLMN.
  Whether GGSN of home or visited PLMN would be used is based on the operator policy, or agreement between PLMNs.
  The MBMS user traffic is provided by the BM-SC in home PLMN and proxyed.
  Figure 28: Activation of an MBMS multicast service in roaming scenario with service provided in the home PLMN
  1.        The GGSN sends an AAR to the BM-SC in visited PLMN seeking authorizationt for the activating roaming UE to receive data from a particular service.
  2.        The BM-SC in visited PLMN finds the BM-SC in home PLMN which will serve the roaming UE based on the multicast IP address, and identity of the user, and sends the AAR to it for the roaming UE to receive data from a particular service.
  3.        The authorization decision is provided from BM-SC in home PLMN in the AAA to BM-SC in visited PLMN. An APN may be included in the signalling between BM-SCs, which indicates a GGSN in home PLMN which will serve the UE for the specific MBMS service. The BM-SC in the visit network may modify the APN based on the operator policy or agreement between PLMNs.
  4.        The authorization decision, as received from BM-SC in home PLMN, is provided in the AAA to GGSN together with the APN to be used for creation of the MBMS UE Context If  the AAA indicates that  the roaming UE is not authorized to receive  the MBMS data the process terminates with no additional message exchange.
  Whether GGSN of home or visited PLMN would be used is based on the operator policy, or agreement between PLMNs, for example, the visited BM-SC may modify the APN from the home BM-SC according to configuration of operator policy.
  5.        The GGSN sends an AAR seeking authorization for the activating UE to BM-SC in home PLMN. This GGSN may be different from the GGSN that receives IGMP join message.
  6.        The authorization decision is provided in the AAA to GGSN.
description: The AAR is a signaling message sent by the GGSN to the BM-SC for service authorization. It contains information about the requesting UE and the desired MBMS service.
explanation: Categorized as Message  since it facilitates communication between network components.
biotag_Context: O,O,B-Network,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Network Function,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,B-Network Function,O,O,B-Message,O,O,B-Network Function,O,O,B-Network,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,B-Network Function,O,O,B-Network,O,O,O,O,O,B-Device,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,B-Message,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,B-Service,O,B-Network Function,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,O,O,B-Device,O,O,O,B-Service,O,O,B-Network Function,O,O,O,O,O,O,O,B-Network,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,B-Service,O,B-Network Function,O,O,O,B-Network,O,O,O,O,O,O,O,B-Service,B-Device,O,O,O,B-Service,O,O,O,O,B-Device,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,B-Network,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Message,O,O,O,O,O,B-Device,O,B-Network Function,O,O,O,O,B-Network Function,O,O,O,O,O,B-Network Function,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,B-Service,O,O
biotag_Description: O,B-Message,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,B-Service,O