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.

NEW JERSEY TURNPIKE:  Take Exit 15W to Route 280 West, then follow 280 West
directions.

ROUTE 280 WEST:  Take Exit 15 (Route 21, Newark) immediately after the William
Stickel Memorial Bridge.  At light at foot of ramp, make a soft left onto
University Avenue.  At fourth light, make a right on Central Avenue.  Go 
through light at King Blvd.  Make first left after light on Summit Street
to arrive at the NJIT campus.

ROUTE 280 EAST:  Take Exit 14A, King Blvd.  Make a right at the light at
the foot of the ramp.  Bear right through the first light, staying on King
Blvd.  Go two more lights and make a right on Central Avenue.  Make first
left on Summit Street to arrive at the NJIT campus.

ROUTE 1 & 9 NORTH AND SOUTH:  Take exit marked Newark, Route 21 (McCarter
Highway).  Cross bridge.  At light at end of bridge, make quick left then
quick right for Broad Street.  (There are clear signs for Broad Street.)
Go about 1 mile.  Make a left on Court Street.  Make right at third light
on King Blvd.  Make left at sixth light on Central Avenue.  Make first
left on Summit Street to arrive at the NJIT campus.

ROUTE 78:  Take Route 78 to the Garden State Parkway.  Follow GSP directions.

ROUTE 22:  Take Route 22 to Route 21 North.  Follow directions for Route 
21 North.

ROUTE 21 NORTH:  Cross bridge.  At light at end of bridge, make quick left
then quick right for Broad Street.  (There are clear signs for Broad Street.)
Go about 1 mile.  Make a left on Court Street.  Make right at third light
on King Blvd.  Make left at sixth light on Central Avenue.  Make first left
on Summit Street to arrive at the NJIT campus.

ROUTE 21 SOUTH:  Make a right on Market Street.  Bear right at fork.  Make 
right at top of hill on King Blvd.  At second light make a left on Central
Avenue.  Make first left on Summit Street to arrive at the NJIT campus.

NEW YORK THRUWAY:  Thruway to Exit 14A, Garden State Parkway.  Follow GSP
directions.

GEORGE WASHINGTON BRIDGE:  NJ Turnpike South to Exit 15W.  Follow Route 280
West directions.

LINCOLN TUNNEL:  West on Route 3 to NJ Turnpike South to Exit 15W.  Follow
Route 280 West directions.



			Other Transportation Systems

NEWARK INTERNATIONAL AIRPORT:  Five miles from the NJIT campus.  A minibus
(Newark Airlink) or taxi service connects the airport with Penn Station in
Newark.  Bus, city subway, and taxi connections may be obtained at the
station.

NEWARK PENN STATION:  Connections to the NJIT campus may be made by bus,
city subway, or taxi.

MORRIS & ESSEX BROAD STREET STATION:  A five block walk to the NJIT campus
via King Blvd. to Central Avenue.  Taxi service is also available.

NEWARK CITY SUBWAY:  From Penn Station in Newark, take the Warren Street
stop for the NJIT campus.