MINIMIZATION OF HANDOFF LATENCY BY CO-ORDINATE EVALUATION METHOD USING GPS BASED MAP

MINIMIZATION OF HANDOFF LATENCY BY CO-ORDINATE EVALUATION METHOD USING GPS BASED MAP
Debabrata Sarddar1, Joydeep Banerjee1, Souvik Kumar Saha1, Tapas Jana2,Utpal Biswas3 and M.K. Naskar1
1 Department of Electronics and Telecommunication Engg, Jadavpur University, Kolkata, India
2. Department of Electronics and Communication Engg, Netaji Subhash Engg College, Techno City, Garia, Kolkata, India
3. Department of Computer Science and Engg, University of Kalyani, Nadia, West Bengal

ABSTRACT

Handoff has become an essential criterion in mobile communication system, specially in urban areas, owing to the limited coverage area of Access Points (AP). Handover of calls between two BS is encountered frequently and it is essentially required to minimize the delay of the process. Many solutions attempting to improve this process have been proposed but only a few use geo-location systems in the management of the handover. Here we propose to minimize the handoff latency by minimizing the number of APs scanned by the mobile node (MN) during each handoff procedure. We consider the whole topographical area as a two dimensional plane. By GPS, we can note down the co-ordinates of the MN at any instant. The average rate of change of its latitudinal distance and longitudinal distance with a specific time period is evaluated at the end of the given time period. With the knowledge of the given parameter, it is possible to determine the latitude and longitude of the MN after a particular instant of time. Hence the direction of motion of the MN can be determined which in turns gives the AP towards which the MN is heading towards. This reduces the number of APs to be scanned. Thus, on an overall basis, the handoff latency can be reduced by almost half to on third of its value.

KEYWORDS

IEEE 802.11,GPS (Global Positioning System), trajectory of MN, Neighbor APs, co-ordinate evaluation. 

Original Source Link : http://aircconline.com/vlsics/V1N2/0610vlsics4.pdf
http://airccse.org/journal/vlsi/vol1.html