An Efficient Approach for Vertical Handover between WLAN and EVDO

The IEEE 802.11 based wireless LAN (WLAN) is most widely used for the real time communication such as Voice over IP (VOIP) video conferencing and etc. As the wireless internet access is increasing day by day by the combination of different small regions which are served by one operator or one Access Terminal. So there is the problem of mobility that a Mobile Node (MN) may move from one network to other network, also there is the problem of connectivity. To maintain the connectivity of a established call between two different networks using mobility management we proposed an efficient algorithm which maintain the real time connection as well as preventing the data loss during transition. We experiment our proposed algorithm by using a redundant buffer which store the data in transition mode and vanish the alternate data bits when the connection is establish with the network. The alternate data bit is also send for the same time as the time taken by the redundant buffer to disappear the data. This process saves our data in the transition time.