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Cloudlet
A cloudlet is a mobility-enhanced small-scale cloud datacenter that is located at the edge of the Internet. The main purpose of the cloudlet is supporting resource-intensive and interactive mobile applications by providing powerful computing resources to mobile devices with lower latency. It is a new architectural element that extends today’s cloud computing infrastructure. It represents the middle tier of a 3-tier hierarchy: mobile ''device --- cloudlet --- cloud''. A cloudlet can be viewed as a ''data center in a box'' whose goal is to ''bring the cloud closer''. The cloudlet term was first coined by M. Satyanarayanan, Victor Bahl, Ramón Cáceres, and Nigel Davies,〔(【引用サイトリンク】title=The Case for VM-Based Cloudlets in Mobile Computing )〕 and a prototype implementation is developed by Carnegie Mellon University as a research project.〔(【引用サイトリンク】title=Elijah: Cloudlet-based Mobile Computing )〕 The concept of cloudlet is also known as mobile edge computing,〔(【引用サイトリンク】title=Mobile-Edge-Computing White Paper )〕 follow me cloud,〔(【引用サイトリンク】title=Follow Me Cloud: Interworking Federated Clouds & Distributed Mobile Networks )〕 and mobile micro-cloud.〔(【引用サイトリンク】title=Emulation-Based Study of Dynamic Service Placement in Mobile Micro-Clouds )〕
==Motivation==
Many mobile services split the application into a front-end client program and a back-end server program following the traditional client-server model. The front-end mobile application offloads its functionality to the back-end servers for various reasons such as speeding up processing. With the advent of cloud computing, the back-end server is typically hosted at the cloud datacenter. Though the use of a cloud datacenter offers various benefits such as scalability and elasticity, its consolidation and centralizion lead to a large separation between a mobile device and its associated datacenter. End-to-end communication then involves many network hops and results in high latencies and low bandwidth.
For the reasons of latency, some emerging mobile applications require cloud offload infrastructure to be close to the mobile device to achieve low response time.〔(【引用サイトリンク】title=The Impact of Mobile Multimedia Applications on Data Center Consolidation )〕 In the ideal case, it is just one wireless hop away. For example, the offload infrastructure could be located in a cellular base station or it could be LAN-connected to a set of Wi-Fi base stations. The individual elements of this offload infrastructure are referred to as cloudlets. And the entire collection of cloudlets is referred to as Mobile-edge Computing, which is an industry initiative created by the European Telecommunications Standards Institute (ETSI).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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