Section: 4.3.12.3 Mobility and Access Restrictions for Emergency Services
Content: When Emergency Services are supported and local regulation requires Emergency Sessions to be provided regardless of mobility or access restrictions, the Mobility Restrictions in clause 4.3.5.7, should not be applied to UEs receiving emergency services. When the E-RABs for emergency bearers are established, the ARP value for emergency bearer services indicates the usage for emergency services to the E-UTRAN. During handovers, the source E-UTRAN and source MME ignore any UE related restrictions during handover evaluation when there are active emergency bearers. E-UTRAN shall not initiate handover to GERAN PS domain. During handover to a CSG cell, if the UE is not a CSG member of target CSG cell and has emergency bearer services, the target eNodeB only accepts the emergency bearers and the target MME releases the non-emergency PDN connections that were not accepted by the target eNodeB as specified in clause 5.10.3. Such UEs behave as emergency attached. During Tracking Area Update procedures, including a TAU as part of a handover, the target MME ignores any mobility or access restrictions for UE with emergency bearer services where required by local regulation. Any non-emergency bearer services are deactivated, according to clause 5.10.3, by the target MME when not allowed by the subscription for the target location. Such UEs behave as emergency attached. To allow the emergency attached UE to get access to normal services after the emergency session has ended and when it has moved to a new area that is not stored by the UE as a forbidden area, the UE may explicitly detach and reattach to normal services without waiting for the emergency PDN connection deactivation by the PDN GW. This functionality applies to all mobility procedures.