1Division of Agricultural Engineering, S. K. University of Agricultural Sciences and Technology-Shalimar, Srinagar, Kashmir, India.
2Department of Electronics and Instrumentation Technology, University of Kashmir, Srinagar, India.
3National Institute of Technology, Jalandhar, India.
The size of the microcell causes a dramatic increase in the number of handoffs. In addition, the small size of the microcell requires handoff algorithms to respond faster. The problems are further exacerbated by the traffic overloading in downtown areas at peak hours and the phenomenon of comer effect causing the signal level to drop by 20–30 dB in 10–20m. Thus, in order to maintain reliable communication in a microcellular system new and better handoff algorithms must be developed. The use of hysteresis and averaging window in classical handoff techniques reduces unnecessary handoffs, but causes delays which result in the calls being dropped. This paper presents a fuzzy logic based handoff algorithm which takes care of inflation of traffic during peak hours and corner effects as well. This is achieved by selecting variable hysteresis corresponding to the increase in traffic density and the change in mobile velocity.
