Section: .2 Downlink Data Notification Acknowledge
Content: A Downlink Data Notification Acknowledge shall be sent from a MME/SGSN to a SGW in response to Downlink Data Notification with an indication of success, or failure when MME/SGSN has reachability or abnormal conditions. Possible Cause values are specified in Table 8.4-1. Message specific cause values are: - "Unable to page UE". - "Context not found". - "Unable to page UE due to Suspension". - "UE already re-attached". - "Temporarily rejected due to handover/TAU/RAU procedure in progress". - "Rejection due to paging restriction". Table .2-1 specifies the presence of the IEs in the message. Table .2-1: Information Elements in a Downlink Data Notification Acknowledge