Patent ID: 8855049

Claim:
A Mobile Switching Centre (MSC) server enhanced for a voice call continuity from UTRAN/GERAN (UMTS Terrestrial Radio Access Network/GSM EDGE Radio Access Network) to E-UTRAN/HSPA (Evolved UMTS Terrestrial Radio Access Network/High Speed Packet Access) which is reverse to a direction from E-UTRAN or HSPA to UTRAN or GERAN in a network, comprising: a transceiver configured for transmitting and/or receiving a radio signal; and a processor operatively coupled to the transceiver and configured for: acquiring an rSRVCC (reverse Single Radio Voice Call Continuity) capability indication of a user equipment (UE) related to the voice call continuity from the UTRAN or GERAN to the E-UTRAN or HSPA, wherein, if the network operates in Network Mode of Operation (NMO) type I, the rSRVCC capability indication is originated from an attach request message sent by the UE and received via a serving GPRS (General Packet Radio Service) support node (SGSN), and wherein, if the network operates in Network Mode of Operation (NMO) type II, the rSRVCC capability indication is sent by the UE; receiving a subscriber data including an rSRVCC allowed indication indicating whether the voice call continuity is allowed or not for a user, wherein the subscriber data including the rSRVCC allowed indication is received during an attach procedure for the UE from a home subscriber server (HSS); determining whether the voice call continuity from the UTRAN or GERAN to the E-UTRAN or HSPA is possible or not, based on all of: the rSRVCC capability indication; the rSRVCC allowed indication; and a status of a registration of the UE; and transmitting an indicator for indicating whether the voice call continuity is possible or not based on the determination result to a base station controller (BSC) or a radio network controller (RNC).