Mobile Cloud-Computing: Supporting users with multiple devices

云计算允许个人和组织以即付即用的方式购买虚拟硬件(基础设施即服务，IaaS)、软件平台(平台即服务，PaaS)或应用程序/功能(软件即服务，SaaS)，可与计量购买电力、天然气或水相媲美，通常被视为提高可扩展性和降低IT解决方案成本的解决方案。移动云计算(MCC)专注于使用移动设备参与云托管服务，因此是云计算和移动计算的交集。MCC的主要驱动力是PC的衰落及其随着移动设备(平板电脑和智能手机)数量的增加而被取代。根据Gartner的数据，2014年PC市场(传统PC、笔记本电脑和超移动设备)的总出货量预计将达到3.16亿台(全球)。相比之下，平板电脑的全球销量预计将达到3.2亿台(全球)，智能手机(占移动手机市场的66%)预计将达到9亿台。为了克服与个人电脑相比明显缺乏计算资源的问题，Mark Baccue提出了使用云计算的想法，这导致了一个良性循环，在这个循环中，云计算和移动设备都是对方增长的驱动力。因此，MCC作为移动和云计算的组合，在IT领域确立了自己的关键组件/技术也就不足为奇了。

Cloud-Computing allows individuals and organizations to purchase virtualized hardware (Infrastructure as a Service, IaaS), software platforms (Platform as a Service, PaaS) or applications/functionality (Software as a Service, SaaS) in a pay-as-you-go manner, comparable to the metered purchase of electricity, gas or water and is most often seen as a solution to improve scalability and reduce costs for IT solutions. Mobile Cloud-Computing (MCC) focuses on using mobile devices to engage cloud-hosted services and is therefore the intersection of cloud-computing and mobile-computing. The main driver for MCC is the decline of the PC and its replacement with the rising number of mobile devices (tablets & smartphones). According to Gartner in 2014 the combined shipments in the PC market (traditional PC, laptops & ultra-mobiles) are expected to reach 316 million units (worldwide). By contrast the worldwide sales of tablets are expected to reach 320 million units (worldwide) and smartphones (66% of mobile handset market) are expected to reach 900 million units. To overcome the apparent lack of computational resources when compared to PCs, Mark Baccue proposed the idea of using cloud-computing which has led to a virtuous cycle in which cloud-computing and mobile devices each are the driver for the growth of the other. It is therefore not surprising that MCC, as the combination of mobile and cloud-computing has establishing itself within IT as a key component/technology.