Patent ID: 7680081

Claim:
A mobile node having a capability of performing communications on a mobile IP (Internet Protocol) network, comprising: a network device having a function of interfacing with said network; a network quality monitor to monitor a quality of said network, based on at least one of an intensity and a radio bandwidth of a radio wave received by said network device; a hand-over controller to execute a hand-over operation of transmitting a care of address to an address registering destination in response to a state of said network quality before disconnecting a communication, changing a route of communication information, and switching a connecting destination into a new network; and a network controller to receive a response that indicates an update of said care of address in said address registering destination and to keep a function of receiving data from the previous network before being switched until said communication is disconnected, wherein: said network quality monitor includes a shortage threshold value for detecting a shortage of said radio bandwidth currently available and a recovery threshold value for detecting a recovery from said shortage of said radio bandwidth, said recovery threshold value being higher than said shortage threshold value; said hand-over controller performs the hand-over operation accompanied with a lower network quality if said radio bandwidth is lower than said shortage threshold value; and said hand-over controller performs the hand-over operation accompanied with a recovered network if said radio bandwidth is higher than said recovery threshold value.