A Virtual Access Point Based Fast Handoff Scheme of IEEE 802.11

–In the fast growing wireless technologies, IEEE 802.11 handoff is a big issue in communication. The seamless handoff problem in WLANs is a very important design issue to support the new astounding and amazing applications in WLANs, particularly for a user in a mobile vehicle. The entire delay time of a handoff is divided into probe, authentication, and reassociation delay times. Because the probe delay occupies most of the handoff delay time, efforts have mainly focused on reducing the probe delay to develop faster handoff schemes. In the proposed system we reduce the latency of handoff in wireless network by using scanning techniques, preregistration and virtualization techniques that will make the handoff faster. The main challenge in the fast handoff is to find the suitable APs, because the most of delay in seamless handoff is due to probe delay. We use the heuristic approach for finding the adjacent APs. After finding all the suitable APs the preregistration process will be started and security context will be transferred to all the selected APs. We are also providing the solution of inter ESS domain handoff problem with the help of virtual AP and buffering mechanism. In the virtual AP technique we use parallel processing of communication between different APs and MH. Keywords––virtual, access point, buffering, handoff, probe delay, ESS domain.