Handoff Through AP Selection Methodology

IEEE 802.11 wireless networks are widely used. It provides more user friendly features on this. Also as the utility of wireless technology grows, wireless networks are being deployed in more widely varying conditions. In WLAN, the process of access point selection at each BS is a critical problem in order to obtain satisfactory throughputs. The data load of WLANs is often unevenly distributed among the access points (APs), which results in unfair bandwidth allocation among Mobile Users. This paper, mainly deals about the deployment of networks, and it is done by bandwidth mapping, handoff and/or handover methods. Selecting the network is initiated by selecting the access points based on many schemes like automatic AP selection, selective scanning algorithm, Graph cut algorithm etc. Also the AP selection had happened based on received signal strength, bandwidth, differentiate probe response. The APs are always decentralized controls and they never freely accept the mobile users, it may have restrictions. Some of the APs restrict foreign users in various ways. The ancient methods adopted AP selection by scanning rich AP information, and handoff from one base station to other base station. However, providing the illusion of continuous connectivity requires selecting the right moment to handoff and the right base station to transfer to. Unfortunately, 802.11-based networks only attempt a handoff when a clientʹs service degrades to a point where connectivity is threatened. In this paper we introduces a new approach ASSAAP [Advanced Scanning Selection of Appropriate AP in wireless networks] which over comes all the problems and select the appropriate AP at right time without wasting the time and cost.