Network node, method, and mobile terminal for providing voice calls to a mobile terminal in a packet-switched-only network

摘要

A network node, method, and mobile terminal for providing circuit-switched (CS) voice calls to a mobile terminal operating in a packet-switched (PS)-only network. A control node such as an EPC node in an SAE/LTE PS-only network is modified to mimic the messaging functionality of a Serving GPRS Service Node (SGSN). The EPC node is connected to an MSC/VLR in a CS network through a Gs interface. The EPC node registers the terminal with the MSC/VLR and provides a VLR TMSI to the terminal. When the MSC/VLR receives an incoming CS voice call for the terminal, the MSC/VLR notifies the EPC node, which sends a paging message to the terminal. To set up the CS voice call, the terminal sends a paging response directly to the MSC/VLR.

主权项

1. A method of providing a circuit-switched (CS) voice call to a mobile terminal operating in a packet-switched-only System Architecture Evolution/Long Term Evolution (SAE/LTE) network, said method comprising:
in a control node in the SAE/LTE network, mimicking the messaging functionality of a Serving GPRS Service Node (SGSN); connecting the control node in the SAE/LTE network to a mobile switching center/visitor location register (MSC/VLR) in a CS network through a Gs interface; receiving by the control node, a paging message from the MSC/VLR utilizing the Gs interface; and sending an equivalent of a CS paging request message from the control node to the mobile terminal in the SAE/LTE network, the equivalent of the CS paging request message indicating the MSC/VLR has received an incoming CS voice call for the mobile terminal, wherein the equivalent of the CS paging request message causes the mobile terminal to send a CS paging response directly to the MSC/VLR.