Section: 5.3.11.2 UE Reachability Notification Request procedure
Content: The UE Reachability Notification Request procedure is illustrated in Figure 5.3.11.2-1. Figure 5.3.11.2-1: UE Reachability Notification Request Procedure 1) If a service-related entity requests the HSS to provide an indication regarding UE reachability on EPS, the HSS stores the service-related entity and sets the URRP-MME parameter to indicate that such request is received. If the value of URRP-MME parameter has changed from "not set" to "set", the HSS sends a UE-REACHABILITY-NOTIFICATION-REQUEST (URRP-MME) to the MME. If the MME has an MM context for that user, the MME sets URRP-MME to indicate the need to report to the HSS information regarding changes in UE reachability, e.g. when the next NAS activity with that UE is detected.