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 ID: 353491
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Slide1
MOBILE CLOUD COMPUTING
Venkat PereddySlide2
OUTLINE
MOTIVATION
WHAT IS MOBILE CLOUD COMPUTING?
WHY IS MOBILE CLOUD COMPUTING?
ARCHITECTURE
ADVANTAGES
APPLICATIONS
ISSUES
WHEN TO OFFLOAD?
CLOUDLETS AND OFFLOADING CODE USING CLOUDLETSSlide3
MOTIVATION
In human life Mobile devices
e.g., smartphone, tablet pcs,
etc
)
become an essential part ofDream of “Information at your fingertips anywhere anytime”, When compared to conventional information processing devices these Mobile devices are lack in resources. Mobile Cloud Computing (MCC)
Motivation
Soultion Slide4
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 COMPUTINGSlide5
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. Slide6
ARCHITECTURESlide7
APPLICATIONS
Mobile Commerce.
Mobile HealthCare.
Mobile Learning.
Mobile Gaming.Slide8
ADVANTAGES
Extending battery
lifetime
Improving data storage capacity and processing
power
Improving reliability and availabilityDynamic provisioningScalabilityMulti-tenancyEase of IntegrationSlide9
ISSUES
Mobile communication
issues
:
Low
bandwidth: One of the biggest issues, because the radio resource for wireless networks is much more scarce than wired networksService 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 problemsHeterogeneity: Handling wireless connectivity with highly heterogeneous networks to satisfy MCC requirements (always-on connectivity, on-demand scalability, energy efficiency) is a difficult problemSlide10
ISSUES IN COMPUTATION SIDE
Computational Offload
Security
Enhancing the efficiency of data access
Context aware mobile cloud cSlide11
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 transmitB: the bandwidth of the wireless InternetPc: the energy cost per second when the mobile phone is doing computingPi: 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 Slide12
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. Slide13
THE CONVERGENCE OF MOBILE NETWORK AND SERVICE PROVIDERSlide14
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.Slide15
Three Tier Architecture for code offload Application Overlay Creation ProcessSlide16
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 computation-intensive server component of the corresponding mobile app.Mobile ClientThe 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
.Slide17
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 computation-intensive server component of the corresponding mobile app.Mobile ClientThe 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
.Slide18
Architecture for cloudlet-based code offloadSlide19
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.pdfSlide20