Processing Circuit Switched Services in an Evolved Packet Network

A mobility management entity (MME) comprising a receiving unit, a transmitting unit and a processing unit, wherein:

• the receiving unit is configured to receive information of a mobile terminated (MT) service from a mobile switching center (MSC), wherein the MT service is a circuit switched (CS) service;
• the transmitting unit is configured to send a message to a user equipment (UE) in an evolved packet system (EPS) network to notify the UE of the MT service;
• the receiving unit is further configured to receive an MT service response from the UE;
• and
• the processing unit is configured to perform one or more subsequent operations according to the MT service response, wherein the MT service response indicates to accept the MT service, or reject the MT service.

A system, comprising:

• a mobile switching center (MSC) and a mobility management entity (MME);
• wherein the MSC is configured to send information of a mobile terminated (MT) service to the MME after receiving the information of the MT service, wherein the MT service is a circuit switched (CS) service, and
• wherein the MME is configured to:
• receive the information of the MT service from the MSC;
• send a message to a user equipment (UE) to notify the UE of the MT service;
• receive an MT service response returned by the UE, and
• perform one or more subsequent operations according to the MT service response, which indicates to accept the MT service, or reject the MT service.