Abstract

The most important issue in Personal Communication Services (PCS) is the mobility management. And the efficiency of this PCS system is dependent on the maintenance of a reliable and optimal radio link between the mobile user and the fixed system. When the mobile user moves out of his coverage area, handoff is required to enjoy continuation of services. In this paper, a handoff algorithm termed as Fuzzy controller for Handoff Optimization (FCHO) is introduced based upon fuzzy logic. Traditional algorithms for handoff using fixed values of parameters can perform well only in specific environment but FCHO exploits attractive features of several existing algorithms, and adds more capabilities to provide adaptation to the dynamic environment. Simulation results reveal that the proposed FCHO algorithm eliminates the problem of corner effect by dynamically changing the value of threshold and hysteresis with the change in the RSSI and the velocity of the mobile station.

References

• A. A. Atayero, M. K. Luka. "Applications of Soft Computing in Mobile and Wireless Communications" International Journal of Computer Applications. Vol. 45, No. 22, PP. 54-56, 2012.
• H. Balakrishnan, S. Seshan, and R. H. Katz, "Improving Reliable Transport and Handoff Performance in Cellular Wireless Networks", ACM Wireless Networks Journal (WINET), Vol. 1, No. 4, PP. 469-481, 1995.
• D. Sarddar, S. Chatterje, U. Biswas, Mandovi Mukherjee, S. Mallik, P. Mazumder and M. K. Naskar. "Minimization of Handoff Latency by Cell Sectoring Method using GPS", International Journal of Computer Applications, Vol. 25, No. 4, PP. 22-29, 2011.
• N. S. V. Shet, K. Chandrasekaran and K. C. Shet, "Implementation of Handoff through wireless access point Techniques", Journal of Telecommunications, Vol. 2, No. . 2, 2010.
• T. C. Ling, J. F. Lee, K. P. Hoh, "Reducing Handoff Delay In Wlan Using Selective Proactive Context Caching", Malaysian Journal of Computer Science, Vol. 23, No. 1, PP. 49-59, 2010.
• M. Stemm and R. Katz, "Vertical handoffs in wireless overlay networks", ACM Journal on Mobile Networks and Applications, Vol. 3, No. 4, PP. 335-350, 1998.
• K. Pahlavan et al, "Handoff in hybrid mobile data networks", IEEE Communication Magazine, Vol. 7, No. 2, PP. 34-46, 2000.
• H. J. Wang, R. H. Katz and J. Giese, "Policy- Enabled Handoffs across Heterogeneous Wireless Networks", In Proceedings of Second IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), IEEE, PP. 51-60, 1999.
• P. Chan et al, "Mobility management incorporating fuzzy logic for a heterogeneous IP environment", IEEE Communication Magazine, Vol. 39, No. 12, PP. 42-51, 2001.
• D. Pubill, A. I. Perez, "Handover Optimization with Fuzzy Logic in 802. 11 Networks", In Proceedings of conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU), Paris (France) , 2006.
• C. F. Kwong, T. C. Chuah and S. W. Lee, "Adaptive Network Fuzzy Inference System (ANFIS) Handoff Algorithm", In Proceedings of International conference on Future Computer and Communication (ICFCC), Malaysia, PP. 195-198, 2009.
• A. S. Sadiq, K. A. Bakar, K. Z. Ghafoor, "A Fuzzy Logic Approach for Reducing Handover Latency in Wireless Networks", Network Protocols and Algorithms, Vol 2, No. 4, PP. 61-87, 2010.