A Micro-Mobility Management Scheme for Handover and Roaming

Even though the PMIP provides mobility solutions, there are many issues of user identity, mobilitycontext of users from a home network to the visiting network, the assignment of home address toa user terminal in a visiting network, identification of the user terminal’s mobility, and identificationof MPA and HA. In this paper, we propose a new mechanism with proxy mobile IPv4, as amobility solution in networks. In this mechanism during mobile node access authentication, MPAexchanges registration messages with the HA (Home Agent) to set up a suitable routing andtunneling for packets from/to the MN. In this method, the authentication request of the mobilenode is passed through the NAS or AP of visiting network, this is then passed to the AAA(Authentication Authorization and Accounting) server, and the authentication server checks therealm and does start authentication procedure at the time of initialing authorizing module of themobile terminal. It also initiates the mobility extension module, where the AAA server initiatesMPA of the access network, which also informs the AAA server of the home network withinformation on the mobility extensions and request of the mobility parameters of the user terminal.The home AAA server interacts with the HA and collects mobile node parameters, as well assending back details as a reply request to the visiting AAA server. After the mobility contexttransfer, the MPA conducts a mobility registration to the HA for that particular mobile node. Laterin this paper, we will provide sequence of message exchanges during a mobility session of a usermobile node during handover.