MOBILE CLOUD
COMPUTING
VENKAT PEREDDY
OUTLINE
MOTIVATION
WHAT IS MOBILE CLOUD COMPUTING?
WHY IS MOBILE CLOUD COMPUTING?
ARCHITECTURE
ADVANTAGES
APPLICATIONS
ISSUES
WHEN TO OFFLOAD?
CLOUDLETS AND OFFLOADING CODE USING CLOUDLETS
MOTIVATION
Motivation
◦ In human life Mobile devices e.g., smartphone, tablet pcs, etc) become an essential part of
◦ Dream of “Information at your fingertips anywhere anytime”,
◦ When compared to conventional information processing devices these Mobile devices are lack in
resources.
Soultion
Mobile Cloud Computing (MCC)
WHAT IS MOBILE CLOUD COMPUTING?
• MCC refers to an infrastructure where both the data storage and data processing happen
outside of the mobile device.
• Mobile cloud applications move the computing power and data storage away from the mobile
devices and into powerful and centralized computing platforms located in clouds, which are
then accessed over the wireless connection based on a thin native client.
• MOBILE CLOUD COMPUTING = MOBILE COMPUTING + CLOUD COMPUTING
WHY DO WE NEED MCC?
◦ Mobile devices face many resource challenges (battery life, storage, bandwidth etc.)
◦ Cloud computing offers advantages to users by allowing them to use infrastructure, platforms and
software by cloud providers at low cost and elastically in an on-demand fashion.
◦ Mobile cloud computing provides mobile users with data storage and processing services in clouds,
obviating the need to have a powerful device configuration (e.g. CPU speed, memory capacity etc), as all
resource-intensive computing can be performed in the cloud.
ARCHITECTURE
APPLICATIONS
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Mobile Commerce.
Mobile HealthCare.
Mobile Learning.
Mobile Gaming.
ADVANTAGES
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•
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Extending battery lifetime
Improving data storage capacity and processing power
Improving reliability and availability
Dynamic provisioning
Scalability
Multi-tenancy
Ease of Integration
ISSUES
Mobile communication issues:
• Low bandwidth: One of the biggest issues, because the radio resource for wireless networks is
much more scarce than wired networks
• Service availability: Mobile users may not be able to connect to the cloud to obtain a service
due to traffic congestion, network failures, mobile signal strength problems
• Heterogeneity: Handling wireless connectivity with highly heterogeneous networks to satisfy
MCC requirements (always-on connectivity, on-demand scalability, energy efficiency) is a
difficult problem
ISSUES IN COMPUTATION SIDE
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Computational Offload
Security
Enhancing the efficiency of data access
Context aware mobile cloud c
WHEN TO OFFLOAD?
The amount of energy saved is
S: the speed of cloud to compute C instructions
M: the speed of mobile to compute C instructions
D: the data need to transmit
B: the bandwidth of the wireless Internet
Pc: the energy cost per second when the mobile phone is doing computing
Pi: the energy cost per second when the mobile phone is idle.
Ptr: the energy cost per second when the mobile is transmission the data.
Suppose the server is F times faster—that is, S= F × M. We can rewrite the formula as
Contd..
Energy is saved when this formula produces a positive
number. The formula is positive if D/B is sufficiently small
compared with C/M and F is sufficiently large.
• Cloud computing can potentially save energy for mobile
users.
• Not all applications are energy efficient when migrated to
the cloud.
• Cloud computing services would be significantly different
from cloud services for desktops because they must offer
energy savings.
• The services should consider the energy overhead for
privacy, security, reliability, and data communication
before offloading.
THE CONVERGENCE OF MOBILE NETWORK AND
SERVICE PROVIDER
CODE OFFLOADING USING CLOUDLET
CLOUDLET:
“a trusted, resource-rich computer or cluster of computers that is well-connected to the Internet
and is available for use by nearby mobile devices.”
Code Offloading :
Offloading the code to the remove server and executing it.
This architecture decreases latency by using a single-hop network and potentially lowers battery
consumption by using Wi-Fi or short-range radio instead of broadband wireless which typically
consumes more energy.
Three Tier Architecture for code offload
Application Overlay Creation Process
Cloudlet Host
The Cloudlet Host is a physical server that hosts
1) a discovery service that broadcasts the cloudlet
IP address and port to allow mobile devices to
find it.
2) The Base VM Image that is used for VM
synthesis
3) a Cloudlet Server that handles code offload in
the form of application overlays, performs VM
synthesis and starts guest VM instances with the
resulting VM images, and
4) a VM Manager that serves as a host for all
guest VM instances that contain the computationintensive server component of the corresponding
mobile app.
Mobile Client
The Mobile Client is a handheld or wearable
device that hosts
1) the Cloudlet Client app that discovers cloudlets
and uploads application overlays to the cloudlet
and
2) a set of Cloudlet-Ready Apps that operate as
clients of the server code running in the cloudlet.
The Mobile Client stores an application overlay
for each cloudlet-ready app that a user would
conceivably want to execute and for which
computation offloading is appropriate. Each
application overlay is generated from the same
Base VM Image that resides in the cloudlet.
Workflow..
Cloudlet Host
The Cloudlet Host is a physical server that hosts
1) a discovery service that broadcasts the cloudlet
IP address and port to allow mobile devices to
find it.
2) The Base VM Image that is used for VM
synthesis
3) a Cloudlet Server that handles code offload in
the form of application overlays, performs VM
synthesis and starts guest VM instances with the
resulting VM images, and
4) a VM Manager that serves as a host for all
guest VM instances that contain the computationintensive server component of the corresponding
mobile app.
Mobile Client
The Mobile Client is a handheld or wearable
device that hosts
1) the Cloudlet Client app that discovers cloudlets
and uploads application overlays to the cloudlet
and
2) a set of Cloudlet-Ready Apps that operate as
clients of the server code running in the cloudlet.
The Mobile Client stores an application overlay
for each cloudlet-ready app that a user would
conceivably want to execute and for which
computation offloading is appropriate. Each
application overlay is generated from the same
Base VM Image that resides in the cloudlet.
Architecture for cloudlet-based code offload
REFERENCES
•http://thoughtsoncloud.com/2013/05/pattern-powered-cloudlets
•http://www.eecis.udel.edu/~cshen/367/papers/survey_MCC.pdf
•The imminent convergence of the technology trio: Demystifying the super potential of 4G, CDN
and cloud computing by Ramachnadran, N. ; Sivaprakasam, P.
•http://www.cs.cmu.edu/~satya/docdir/simanta-mobicase2012.pdf