Method and apparatus for setup of a circuit switched call during circuit switched fallback

A user equipment comprising:

• a processor;
• a communications subsystem;
• wherein the user equipment is configured:
• send a request to a first network for Circuit Switched Fallback (‘CSFB’) while connected to the first network;
• receive, responsive to the request, redirection information to a second network;
• acquire the second network based on the redirection information;
• initiate Packet Switched (‘PS’) signaling with the second network after radio bearers for a circuit switched (CS) connection are established with the second network.

A method, at a network element, comprising:

• receiving a request for Circuit Switched Fallback (‘CSFB’) from a user equipment (‘UE’), the UE having a connection to a first network;
• sending, to the UE, redirection information for transfer of the connection to a second network;
• receiving a Routing Area Update (‘RAU’) message from the UE to initiate the transfer of the connection to the second network;
• initiating Packet Switched (‘PS’) signaling with the second network after radio bearers for a circuit switched (CS) connection are established with the second network

A network element, comprising:

• a processor;
• a communications subsystem;
• wherein the network element is configured to:
• send a request to a first network for Circuit Switched Fallback (‘CSFB’) while connected to the first network;
• receive, responsive to the request, redirection information to a second network;
• acquire the second network based on the redirection information;
• initiate Packet Switched (‘PS’) signaling with the second network after radio bearers for a circuit switched (CS) connection are established with the second network.