System and method for minimizing loss of IP context during IRAT handover

摘要

A method for maintaining IP context during an inter RAT handover of a UE between an eHRPD network and an LTE network may include delaying a transfer of an Internet Protocol context for at least one active packet data network until an IP address for an attach (PDN) Packet Data Network has been assigned and in the case where the Internet Protocol address for the Attach Packet Data Network is not assigned, initiating a detach operation from the LTE network without the user equipment losing the Internet Protocol context of the at least one active Packet Data Network.

主权项

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.