Method of performing session handover between terminals, network system, and program

摘要

It is difficult to perform handover between mobile terminals. In addition, when a session handover is performed between terminals whose mobilities are managed by individual Mobile IP HAs, it is difficult for an IETF standard to normally treat an Uplink packet. A network system includes: a function 9 that manages bind information between terminals which are arranged in a network and are subjected to the control of a user; a function 5 that translates an address; a function 7 that performs encapsulation between HAs; and a function that is provided in a terminal and transmits the bind information and a handover trigger to the bind information management function 9.