Patent ID: 6404754
Filing Date: 2002-06-11
Classification: H04W

Abstract:
A method of determining Internet interworking protocol address, comprising:transmitting mobile station packet calls from a mobile terminal of a mobile station to a radio network controller in a radio packet data network and registering as a packet data service option of the mobile terminal one of a simple interworking protocol (SIP) option, a mobile interworking protocol (MIP) option, and a unique interworking protocol (UIP) option in accordance with a response to the transmitted mobile station packet calls; establishing a point-to-point (PPP) link by calling data service packets in accordance with the option registered in the mobile terminal after the registration of the packet data service option and releasing a packet channel of the mobile terminal if a term of a PPP link timer of the radio network controller expires and a present state is a dormant-open state; and re-establishing the established PPP link by re-transmitting the mobile station packet calls to a new radio network controller and transmitting upper layer data on a virtual network pipeline (VNP) if a handoff is generated between the mobile station and the new radio network controller in the dormant-open state of the PPP link.