The IEEE Communications North Jersey Chapter
The IEEE Signal Processing North Jersey Chapter
The Center for Communications and Signal Processing
		PRESENT

Speaker: Dr. Li-Chun Wang from AT&T Laboratories.
Place: 202 ECEC, NJIT.
Date: October 21, 1997
Time: 4:45pm (refreshments start at 4:45pm).

TITLE: Cellular Architectures for Wireless Personal Communications

ABSTRACT: 
Hierarchical microcell/macrocell architecture has been proposed
for future personal communications systems.  This architecture
provides capacity relief to a macrocell system and offer many
advantages over a pure microcell system. Unlike the pure
microcell system, which requires extensive microcell base
station (BS) deployment throughout the whole service area,
a hierarchical architecture allows gradual deployment
of microcells as user demand increases.  The hierarchical architecture
also protects investment cost in the existing macrocellular system,
while a pure microcell system requires replacement of the macrocell BSs.
Furthermore, the fast handoff requirement in a pure microcell system can
be relieved in the overlaying architecture by temporally connecting the
call to a macrocell BS.

The method of sharing the radio spectrum is the key issue for
hierarchical microcell/macrocell systems. In this talk, different
kinds of frequency sharing schemes for hierarchical
microcell/macrocell systems is  discussed. We present an innovative
hierarchical microcell/macrocell architecture and its frequency
management methodology. By applying the concept of cluster planning,
the proposed sectoring arrangement can provide good shielding
between micro- and macro-cells. As a result, underlaid microcells
can reuse the same frequencies as overlaying macrocells without
decreasing the macrocell system capacity. With the proposed method,
microcells not only can be gradually deployed, but they can
be extensively installed to provide complete coverage and
increase capacity throughout the service area.
With these flexibilities, the proposed
method allows existing macrocellular systems to evolve smoothly
into a hierarchical microcell/macrocell architecture.

BIO:
Li-Chun Wang received the B.S. degree from National 
Chiao Tung University in 1986; the M.S. degree from 
National Taiwan University in 1988; the M.Sci. and  
Ph.D. degrees from the Georgia Institute of Technology 
in 1995 and 1996, all in electrical engineering.

From 1990 to 1992 he was with the Telecommunications 
Laboratories of Ministry of Transportations and Communications 
in Taiwan (currently the Telecom Labs of Chunghwa Telecom Co.).  
In 1995 he worked at Bell Northern Research of Northern 
Telecom Inc. (currently Nortel Inc.) in Richardson, Texas.
Since July 1996, Dr. Wang has been with AT\&T Laboratories, 
where he is a Senior Technical Staff Member in the Wireless 
Communications Research Department.  His current research 
interests are in the area of cellular architectures, radio 
resource management, and propagation channel modeling. 
Specific topics include hierarchical cellular architectures,
macrodiversity cellular systems, dynamic channel allocations, 
power control, and micorcellular interference modeling.

NOTE THAT election for next year COMSOC chapter officials will be
held prior to the election.