Patent ID: 8811936
Filing Date: 2014-08-19
Classification: H04L,H04W

Abstract:
1. A method of handling call origination for a mobile device in a wireless communication system, the mobile device camping on a first cell, the method comprising the steps of: originating a service; establishing a radio resource control (RRC) connection corresponding to the service; receiving a non-access stratum (NAS) message via the RRC connection or a broadcast message from a first network; determining whether the first network supports the service of an IP multimedia subsystem (IMS) domain, according to the NAS message or the broadcast message; performing the service in a circuit switched (CS) domain when the first network does not support the service of the IMS domain; receiving a CS fallback command; transferring the RRC connection from the first network to a second network which provides the service in the CS domain, according to the CS fallback command; and selecting a second cell which provides the service in the CS domain; wherein transferring the RRC connection from the first network to the second network which provides the service in the CS domain, according to the CS fallback command, comprises: