从云计算到雾计算的范式转变

虽然云计算的应用越来越广泛，但也具有不能支持高移动性、不支持地理位置信息及高时延等亟待解决的问题.为此，雾计算已经出现，并将云计算扩展到网络的边缘，以减少延迟和网络拥塞.首先介绍了雾计算的概念、特点和结构，然后讨论了具有代表性的应用场景以及雾计算的安全问题.另外，还对雾计算相似的原位计算和连续计算进行了介绍.最后，给出了云计算与雾计算的区别与联系，并分析了雾计算未来的发展方向.雾计算扩大了以云计算为特征的网络计算范式，将网络计算从网络的中心扩展到网络的边缘，从而可以更加广泛地运用于更多的应用形态和服务类型.

A paradigm shift from cloud computing to fog computing and edge computing

Although the cloud computing has more and more extensiveapplications,it is hindered by problems such as non-support of high mobility or geographical position information,high latencyand so on.To this end,fog computing has emerged,where cloud computing is extended to the edge of the network to decrease the latency and network congestion.This paper first introduces the concept,characteristics,and a reference architecture for fog computing,then discusses the application scenarios and the issue of fog computing security.Similar paradigmsto fog computing like in-situ computing and edge computing are also delineated.Finally,the distinctions and relations between cloud computing and fog calculation are given,and the future development direction of the fog is analyzed.Fog brings computing from the core tothe edge of the network,which expands the network computing paradigm characterized by cloud computing,thus will be applied to more and more extensive serviceforms and types.