Patent ID: 9088881
Filing Date: 2015-07-21
Classification: H04J,H04W

Abstract:
1. A method in a Mobile Switching Center Server (MSC-S) for delivering a Short Message Service (SMS) message to a terminating User Equipment (UE) over an SAE core network and an LTE radio access network, said method comprising: sending a paging request message from the MSC-S to a Mobility Management Entity (MME) in the SAE core network with an indication that a mobile terminated SMS message is available for the terminating UE; receiving by the MSC-S, a paging response or service request message from the MME, wherein when the UE is in LTE-ACTIVE state, the MSC-S receives an immediate paging response or service request message from the MME without paging the UE, and when the UE is in LTE-IDLE state, the MSC-S receives the paging response or service request message from the MME after a delay for paging the UE; and forwarding the mobile terminated SMS message from the MSC-S to the MME via an extended SGs interface (SGs+) between the MSC-S and the MME, wherein the SGs+ interface supports transmission of SMS packet data units; wherein forwarding the mobile terminated SMS service message includes sending an SGs+ downlink data transfer message to the MME, said SGs+ downlink data transfer message including SMS control plane packet data units and SMS message content for delivery to the terminating UE.