THE NORTH JERSEY CHAPTER OF THE IEEE COMMUNICATIONS SOCIETY and THE CENTER FOR COMMUNICATIONS AND SIGNAL PROCESSING RESEARCH Present ANALYSIS OF HANDOFF ALGORITHM by DR. JACK M. HOLTZMAN RUTGERS UNIVERSITY, WINLAB WHEN: Wednesday, April 17, 1996, 6:30 p.m. (Pizza & pop at 6:15) WHERE: Room 202, Electrical and Computer Engineering Center New Jersey Institute of Technology ABSTRACT Properly designed handover algorithms are critical for the overall functioning of a cellular radio system. We present a model for analyzing the performance of handoff algorithms. This model enables us to evaluate the effect of averaging and hysteresis on the handoff process. Handoffs are related to level crossings of the difference between the received signal strengths from two base stations. It is shown that algorithm performance can be well predicted by modeling the level crossings as Poisson processes with time- varying rate functions. The model is seen to yield results that agree with simulations over the range of algorithm parameters of practical interest. These results can be used to determine the averaging interval and hysteresis level that achieve the optimum tradeoff between the number of unnecessary handoffs and the delay in handing off. The results were somewhat surprising in that they used asymptotic results for level crossings. It may have been anticipated that such asymptotic results would not be applicable in practical parameter regions. The applicability is explained. This work stimulated further work in analyzing handoff. Some of the further work will be discussed, including soft handoff as used in the IS-95 CDMA system. BIOGRAPHY Dr. Jack M. Holtzman received the Ph.D. degree from the Polytechnic Institute of Brooklyn, Brooklyn, NY. He worked for AT&T Bell Laboratories for 26 years, where he was supervisor of the Mathematical Analysis and Consulting Group and then head of the Teletraffic Theory and System Performance Department. In 1990 he joined Rutgers University, New Brunswick, NJ, where he is a professor with the Department of Electrical and Computer Engineering and associate director of the Wireless Information Network Laboratory. He is also director of the Wireless Communications Certificate Program. His current areas of work include spread spectrum, handoffs, resource management, location estimation, propagation, and wireless system performance. PLEASE POST For more info. contact N. Ansari, (201) 596-3670, ang@faraday.njit.edu; or Z. Siveski, (201) 596-5710, zoran@hertz.njit.edu WWW: http://hertz.njit.edu/~ieeenj TRAVEL DIRECTIONS TO NEW JERSEY INSTITUTE OF TECHNOLOGY By Car GARDEN STATE PARKWAY (GSP): Take Exit 145 to Route 280 East, then follow Route 280 East directions. 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