An Implementation of Vertical Handoff in Heterogeneous Networks

With the development of wireless communication technologies and mobile Internet, the demand for the ubiquitous service is increasing dramatically. However, there are many critical issues which prevent the performance in accessing the ubiquitous heterogeneous wireless networks. So the subject has become the focus of many research institutions. We establish a practical testbed which includes the different wireless access network technologies: WLAN, GPRS and TD-SCDMA. In our experiment, the mobile node (MN) is a multi-interface device supporting mobile IPv6 (MIPv6). We implement the MN vertical handoff and evaluate the performance of MN vertical handoff in terms of the handoff delay.