Registering user equipment with a circuit-switched domain

Abstract

A system and method for registering a user equipment (UE) to a circuit-switching (CS) domain only is discussed herein. An application server (AS) generates a subscribe-notifications-request (SNR) and transmits the SNR to a node of a network, such as a home subscriber server, to request a change in user data when a user equipment (UE) registers only with the CS domain after reconnection to the network. The SNR includes an attribute value pair (AVP) to generate a notification that the UE is registered with the CS domain without requiring initial registration with a packet-switched (PS) domain. The HSS, which receives notification of registration of the UE to the CS domain from a home location register (HLR) a mobile switching center/visitor location register (MSC/VLR), generates a push-notification-request (PNR) to notify the AS of the change in user data.

Dependencies are inferred from the claim text.