As we know, Handoff is an important task in
maintaining the continuity of call in cellular systems and its
failure can result in ongoing call termination. As mobility in
wireless cellular communication systems is its backbone, so as to
enhance the quality of service (QoS) & to maintain the
continuous service for users to providing a ubiquitous coverage.
In this paper a brief description about the different handoff
techniques in cellular systems (GSM, CDMA) moreover it
compares all the handoff strategies on the basis of traffic,
execution time, S/I ratio, RSS (Relative Signal Strength), call
handling difficulty, handoff made and generation methods. Paper
also finds the brief comparison between all handoff strategies
which are used in mobile communication.
Amit Dixit : Professor, Quantum School of Technology,
Mandawar, Roorkee -Dehradun Highway, Roorkee, UK
Sujata Sharma : Research Scholar, Quantum School of Technology,
Mandawar, Roorkee -Dehradun Highway, Roorkee, UK
QoS
Handoff
Horizontal Handoff
Vertical
Handoff
Hard Handoff
soft handoff
GSM
CDMA
We have thoroughly studied handoff strategies and have
learned, that handoff is the process where changing the
channels like frequency, time slot, spreading codes or
combination of them, are associated with the current
connection during a call. The service of wireless
communication depends on the handoff strategy. Here we
can find out, which handoff strategy is suitable for the call
continually. Above discuss the all handoff strategies where
it shown that which handoff is required suitable parameter
to minimize the handoff, so in above discuss, it has been
cleared that the soft handoff occurred in the vertical
handoff where all the parameters have been discussed.
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