Fast handoff mechanism in WLANs based on neighbor graph information

According to IEEE 802.11 based WLAN standard, handoff at link layer (L2) consists of three distinct phases scanning, authentication and re-association. Scanning process takes 90% of the total handoff execution time [7] which is known as handoff delay or handoff latency. So in this paper our main goal is to reduce scanning delay, as a small handoff delay results a seamless and successful handoff. And a successful handoff ensures an uninterrupted flawless connectivity when the mobile station (STA) moves out of its old base station´s (BS) coverage area. In this paper we proposed selective scanning based on position, speed and direction of motion of the Mobile station using the neighbor graph to reduce the scanning delay.