Patent ID: 8509182

Claim:
A home agent that transmits and receives data with a mobile terminal, which performs handover between a first network and a second network, the home agent comprising: a network interface that transmits data to the mobile terminal and receives data from the mobile terminal, through the first network or the second network; and a mobility protocol module that receives a handover request message requesting to switch from the first network to the second network from the network interface, generates a first reply message describing acceptance of the switching transmitted through the second network, provides the first reply message to the network interface, starts packet transmission and reception using the second network, generates a reply request message transmitted through the first network, provides the reply request message to the network interface, acquires a second reply message in response to the reply request message from the network interface, and stops utilization of the first network, wherein the network interface transmits the first reply message to the mobile terminal, and the home agent discards a packet received through the first network after reception of the second reply message.