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Mobile Cloud Computing - Purdue University

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Mobile Cloud Computing by Preston Cox
General Information
Smart phones, tablets, and cloud computing are converging1 trillion cloud-ready devicesGartner predicts that mobile cloud computing will reach a market value of US$9.5 billion by 2014Cloud computing enables convenient, on-demand network access to a shared pool of configurable computing resources (such as networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.
Mobile cloud computingwas defined in a 5 March 2010 entry in the Open Gardens blog as "the availability of cloud computing services in a mobile ecosystem. This incorporates many elements, including consumer, enterprise,femtocells, transcoding, end-to-end security, home gateways, and mobile broadband-enabled services." (Afemtocellis a small cellular base station.)
Platforms: smart phonesThere are many smart phone manufacturers, but the devices themselves can be grouped by operating system. The most-used mobile operating systems are the Research in Motion (RIM) BlackBerry operating system, the Windows™ Mobile® operating system, Nokia's Symbian platform, and UNIX® variations such as Google Android and AppleiOS.
Operating Systems
The BlackBerry operating system, developed by RIM, is a proprietary mobile operating system. For application developers, it offers a Java™ development environment that includes a BlackBerry IDE, a smart phone simulator, and APIs for Java Platform, Micro Edition (Java ME) and BlackBerry. Applications are distributed through BlackBerry App World and third-party vendors such asMobiHand.The Android mobile operating system is built on a modified Linux® kernel. Initially developed by Android, Inc., and bought by Google in 2005, Android development and maintenance is now performed by the Android Open Source Project led by Google. Android application developers write code mainly in the Java language using the Android SDK, which includes an emulator of a run time environment for testing and debugging. Applications are distributed through the Google Android Market and other distribution channels, such asGetJarandHandango.AppleiOSis derived from Apple Mac OS X, which itself is a set of UNIX-based operating systems and GUIs. Developers build applications—mainly in Objective-C—using the AppleiOSSDK,Xcode, and Interface Builder. Applications are distributed through Apple's App Store, which currently contains more than 300,000 applications.
Operating Systems
The current Windows Mobile proprietary operating system is called Windows® Phone 7, which is a successor to the Windows Mobile operating system. According to Microsoft, Windows Phone 7 was designed for the user experience instead of enterprise support. Developers write code to access the device through its APIs, but some APIs are not yet available, such as a compass API, a video API, or a sockets API. Applications are distributed through the Windows Phone Marketplace.The Symbian platform is an open source operating system designed for Nokia smart phones. It uses a proprietary operating system services layer, with a Java ME application services layer. Application developers write code in C++, the Java language, and Perl and use an SDK that can be customized for the IDE the developer intends to use.Nokia and Microsoft announced a pact to adopt Windows Phone 7 for Nokia's phones. An announcement from Nokia suggests that it will take about a year for Nokia phones running Windows Phone 7 to appear on the market and that 2011 and 2012 will be transition years for smart phone sales. Symbian-based smart phones will be phased out as Windows Phone 7 smart phones begin to appear.
Platforms: tabletsTablet computers are larger than a smart phone but interact with the user in much the same way, using a touchscreen as a primary input device. They often don't have a keyboard. Unlike laptops, they are single-user personal devices; however, tablets access the cloud in the same manner as smart phones. As of the end of 2010, the top-selling tablets were the AppleiPadand Android tablets made by Samsung, Motorola, and Acer.Visitors at the Consumer Electronics Show in Las Vegas, Nevada, in January 2011 saw a rain of tablets that will enter the market in 2011. Many will be based on the Android operating system. RIM will introduce its BlackBerryPlayBook, which uses the BlackBerry Tablet OS. Motorola will introduce its Android-basedXoomtablet. Apple will release its second- and third-generationiPadtablets. Expected improvements include a dual-core processor, a higher-quality display, a front-facing camera, and an SD card slot.
A notable issue with the mobile cloud is the resource poverty of mobile devices. Compared to desktop computers, they have less screen real estate, less memory, less compute power, and battery capacity limits. Because of the resource poverty, the mobile cloud is most often viewed as anSaaScloud,meaning that computation and data handling are usually performed in the cloud. Smart phones often access the cloud through web browsers or thin clients.Latency and bandwidth affect the mobile cloud, as well. Wi-Fi improves latency but may decrease bandwidth when many mobile devices are present. Bandwidth for 3G cellular may further be limited by cell tower bandwidth in some areas. Similarly, connectivity may be intermittent. As cellular providers build out their networks, the situation will improve, but dead spots won't completely disappear.Security issues increase with mobile devices. After all, it's easier to lose a mobile device. What if that device contains sensitive data just downloaded from the cloud? Hopefully, years of experience in the computer industry and cloud computing mean that mobile is not far behind in resolving these issues.
Enabling Technologies
The growth of the mobile computing market will be enhanced by a wide range of enabling technologies. The impact of the broad introduction of tablet computers throughout 2011 could be an added motivator for advancements, as well.4GCertainly, one of the biggest enablers will be the full roll-out of 4G technology, which will help with issues of latency and bandwidth. For example, Samsung introduced the Yes Buzz 4G cloud phone in Malaysia in January 2011. It has no SIM card and allows contacts to be saved and synchronized on the Internet.In February 2011, Motorola introduced theAtrix, a 4G phone with a fingerprint reader for use in unlocking the phone. It also fits into an optional dock that connects to a keyboard and mouse, converting the phone into a laptop. Reports say this new phone is buggy, but Motorola claims that it shows how we'll be using mobile devices in 10 years. TheAtrixbegan shipping in March 2011, following pre-orders in February.
Enabling Technologies
HTML5 and CSS3HTML5 is an important step for mobile web applications. HTML is a document publishing markup language that provides a means of specifying web page elements such as headings, text, tables, lists, and photos. Enhancements that HTML5 introduces address the need for web application support. HTML5 also allows specification of offline support, which makes local storage possible, helping with connectivity interruptions. It also adds canvas and video features, enabling graphics and video without plug-ins. HTML5 features improvements in forms specifications that benefit mobile applications. In addition, HTML5 often comes with ageolocationAPI.One example of an HTML5 benefit is the ability to watch a video without a plug-in like Adobe® Flash® or Microsoft® Silverlight™. Another example is the ability to store and access data such as e-mail messages and calendars, which helps make web applications more useful.CSS3 works with HTML5 to specify how elements of a page should be rendered. An HTML specification tells a web browser what to display, and a CSS specification tells the web browser how to display it. New elements in the HTML5 specification require new guidance to display them—hence the need for the new version of the CSS standard.Both HTML5 and CSS3 are still under development, but some of their features are being implemented in browsers such as Apple Safari and Google Chrome. Sample web sites can be found at,The New York Times, andVimeo. HTML5 features are also implemented in hybrid application frameworks like Phone Gap,QuickConnect,RhoMobile, Titanium, and Mobile. These frameworks are helping to enable cross-platform development for mobile devices.
Enabling Technologies
HypervisorAnother enabler for cross-platform applications is an embedded hypervisor, which allows a web application to run on any smart phone without being aware of the underlying architecture. The hypervisor allows other software to run in a virtualized environment.Mobile platforms require the hypervisor to be built in. For example, the MotorolaAtrixhas an embedded hypervisor that allows it to run a wider range of applications, not just those developed specifically for it.CloudletsIf you expand the view to include devices like thefemtocellmentioned earlier, then you can talk aboutcloudlets,which promise to help with the latency issue in mobile cloud computers. Wi-Fi hotspots and other local devices can be equipped with local processing and storage.Acloudletis a small, simple device that resides nearby—maybe in a coffee shop. When needed, the device downloads user data from a centralized location, permitting local access by the user and thereby reducing latency. When finished, the user data can be returned to the centralized location, if necessary. This process occurs invisibly to the user, except that the user is pleased with faster response.
Enabling Technologies
Web 4.0The tweeting dieffenbachia mentioned at the beginning of this article is an example of an ongoing development called theInternet of Things—a phrase coined by a research group at the Massachusetts Institute of Technology. It is also calledMachine to Machine communicationand refers to communication through the Internet between non-phone, ordinary objects providing information about their surroundings and activities.Humans can also be a part of this phenomenon, as in the example of answering the question, "What are you doing?"—the reason behind Twitter, of course. In this case, your smart phones and feature phones become like sensors conveying to the Internet information you supply about your surroundings and activities.Another term for the Internet of Things isWeb 4.0and sometimes, theSymbiotic Web.One writer describes the phenomenon as the migration of online functionality to real-world objects, as in the example of being able to run a Google search of your home to find the TV remote control. The existence of this phenomenon is not so much an enabling technology as it is a driving technology for mobile cloud computing.
CC as Disruptive Force
There are two primary reasons why ABI believes cloud computing will become a disruptive force in the mobile world. The first is simply the number of users the technology has the power to reach: far more than the number of smartphone users alone. The second reason has to do with how applications are distributed today. Currently, mobile applications are tied to a carrier. If you want an iPhone app, for example, you have to first have a relationship with the mobile operator who carries the iPhone. If you want a Blackberry app, the same rule applies. But with mobile clouding computing applications, as long as you have access to the web, you have access to the mobile application.
There are some potential issues that could be barriers to this shift in mobile computing. The most notable problem is the lack of speedy mobile Internet access everywhere. Here in the US, for example, 3G coverage is spotty outside urban areas, leading to intermittent connection issues and slow speeds. Other markets may have it even worse.However, new technologies like HTML5, which does local caching, could help mobile cloud apps get past those sorts of issues. And there's even a chance that the browser could one day be replaced - at least in some markets - with another technology altogether which provides a better way to access the mobile web.





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