Section: 19.2.2.1 Service Provided by the BM-SC in home PLMN
Content: Figure 30a: Deactivation of an MBMS multicast service in roaming scenario with service provided in the home PLMN 1. Upon receiving the leave indication, the GGSN sends an STR to the BM-SC in visited PLMN, indicating that the roaming UE is requesting to leave the multicast service. The session to be terminate is uniquely identified by the Diameter session-id. 2. Upon reception of the STR, the BM-SC in visited PLMN finds the BM-SC in home PLMN which serves the roaming UE, and sends an STR to it for the roaming UE to deactivate a particular service. 3. Upon reception of the STR, the BM-SC in home PLMN verifies that the IP multicast address corresponds to a valid MBMS bearer service and responds the BM-SC in visited PLMN with an ST-Answer. The APN shall be the same that was provided during service activation. 4. Upon reception of the STA, the BM-SC in visited PLMN sends an STA to the GGSN that orignated the Leave Indication. 5. The GGSN which is used to establish the MBMS bearer service deletes the MBMS UE Context and sends an STR to the BM-SC in home PLMN to confirm the successful deactivation of the MBMS UE Context. 6. The BM-SC in home PLMN then, deletes the MBMS UE Context and sends a confirmation to the GGSN in an STA message.