Handoff in hybrid mobile data networks
Pahlavan, K.; Krishnamurthy, P.; Hatami, A.; Ylianttila, M.; Makela, J.P.; Pichna, R.; Vallstron, J.
Personal Communications, IEEE
Volume 7, Issue 2, Apr 2000 Page(s):34 - 47
Digital Object Identifier 10.1109/98.839330
Summary:With the emergence of a variety of mobile data services with
variable coverage, bandwidth, and handoff strategies, and the need for
mobile terminals to roam among these networks, handoff in hybrid data
networks has attracted tremendous attention. This article presents an
overview of issues related to handoff with particular emphasis on hybrid
mobile data networks. Issues are logically divided into architectural
and handoff decision time algorithms. The handoff architectures in
high-speed local coverage IEEE 802.11 wireless LANs, and low-speed wide
area coverage CDPD and GPRS mobile data networks are described and
compared. A survey of traditional algorithms and an example of an
advanced algorithm using neural networks for PTO decision time in
homogeneous networks are presented. The HO architectural issues related
to hybrid networks are discussed through an example of a hybrid network
that employs GPRS and IEEE 802.11. Five architectures for the example
hybrid network, based on emulation of GPRS entities within the WLAN,
mobile IP, a virtual access point, and a mobility gateway (proxy), are
described and compared. The mobility gateway and mobile IP approaches
are selected for more detailed discussion. The differences in applying a
complex algorithm for HO decision time in a homogeneous and a hybrid
network are shown through an example
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