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Mobile Computing Model:
•Mobile Computing Model: It consists of a set
of mobile computers & stationary hosts
consulted by a fixed n/w.
•Mobile Transaction: Mobile computing is the
ability of user to access the database by means
of wireless devices.
•There exist a stationary architecture that is a
backbone for a distributed mobile computing
system.
•Stationary Host (SH) also called fixed host (FH) &
base station (BS).
•The wireless device that issue the transaction
are called mobile station (MS).
•Transaction is a set of database operation
(Insertion, Deletion, Updation, Retrival of data)
•The transaction can be written in query
language such as SQL.
•NOTE: A mobile transaction is a transaction
where at least one mobile host is involve in the
transaction.
•Mobile Computing Environment:-
•A mobile computing environment includes-
•A wired n/w with fixed hosts (FH)
•Mobile hosts (MH) and
•Mobile support stations (MSS)
•Connection b/w MH & MSS is wireless n/w. This
n/w is characterized by low bandwidth, error
prone & frequent disconnections.
•MSS& FH communicate each other via reliable
high speed connection n/ws, which can be wired
n/w or wireless n/w .
•The MSS is motionless. The role of MSS is not as
a processing element but it is acting as an
interface to MH getting contact with relevant FH.
•Each MSS responds for an area (Cell) in which it
will support all MHs operating in this area.
