TechnoMaster Co. Ltd.
The authors are now going to the 4G network and in the 4G network environment, there are so many devices connected to the Internet while they move. They have protocol that can support movement of communicating node without any disruption of their connection status named Mobile IP (MIP). But, the major problem of this MIP is too heaviness of the protocol for small mobile nodes. So, IETF now propose PMIP to solve this problem. But, there is no way to authenticate the mobile node in PMIP.