Patent ID: 8982836
Filing Date: 2015-03-17
Classification: H04W

Abstract:
1. A method for maintaining an Internet Protocol (IP) context during an inter radio access technology (IRAT) handover, comprising: sending a handover attach request message to an attach packet data network (PDN) of a second RAT when a user equipment (UE) is camped on a cell of a first RAT; sending a PDN connectivity request to one or more other active PDNs of the second RAT; determining whether an IP address is received from the attach PDN; and transferring the IP context from a PDN of the first RAT to the one or more other active PDNs of the second RAT when the UE receives the IP address from the attach PDN of the second RAT or sending a detach request when the IP address from the attach PDN is not received at the UE.