Circuit switching fallback network location provision USSD request / notification processing, mobile incoming location request processing, internetworking for subscriber information provision processing

摘要

A method of switching a user equipment from a long term evolution system to a circuit switching system when a voice call is received is disclosed. In this method, an IWF (Internetworking Function) network node receives mobile communication application part unstructured supplementary service data (MAP USSD) that identifies a user equipment (UE) derived from a USSD application, and the UE A home location that is associated with one circuit switching center (MSC) and initiates a circuit switching fallback (CSFB) by sending a paging request to the UE, indicating that the UE is associated with a second MSC Receive a cancel location message associated with the UE from the register (HLR), send a MAP USSD message to the UE via the HLR and the second MSC, receive a MAP USSD response message from the UE via the HLR, and MAP USSD response message to USSD application Including sending. [Selection] Figure 1