27-12-2012, 01:52 PM
Mobile Computing
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Migration is important for survival.
Mobility originated from the desire to move either
toward resources or away from scarcity.
Mobile computing about both physical and logical
computing entities that move.
Physical entities are computers that change locations
Logical entities are instances of a running user
application or a mobile agent.
Mobile agents can migrate any where over internet.
But active applications can only move to a local
cluster of computers.
Buzzwords
Mobile, ubiquitous, nomadic, untethered, pervasive
and any time, any where, any person computing
are used by researchers to refer to computing
that uses small portable devices and wireless
communication n/w.
Nomadic computing refer to limited migration.
Migration is within a building at a pedestrian
speed.
Interleaved pattern of user relocation and indoor
connections
In the same vein, users carrying laptop with
DIAL-UP modems are engaged in nomadic computing.
Challenges
Mobility/context aware applications
Naming and locating
Routing data and messages
Reliability in presence of disconnection
Data management
Transaction models
Security
Mobile computing aects entire spectrum of issues
in computing.
First of all it is distributed + mobile computing.
Distributed computing as we know works on
static wired network.
Node may initiate computation some where and
migrate to another place.
So two major problem that arise due to mobility