Fog computing is a computing paradigm that pushes cloud services to the user's edge.It mainly accelerates content distribution through the method of users' passively pulling content,and lacks active push capacity.Therefore,we propose to use the active push with strong broadcast structure to assist the fog computing architecture and to achieve the active push of the content.Then,a collaborative content distribution mechanism based on software definition is proposed for distributed content distribution,which includes multi-granularity cooperative storage mechanism,software definition strategy and multi-node cooperative strategy in the domain.Finally,the prototype system was used for the experimental test and result analysis.The result reveals that the mechanism can reduce the user request delay and improve the user experience.%雾计算是一种将云服务推向用户边缘的计算范型,其主要采用用户被动拉取内容的方式来加速内容分发,缺乏主动推送能力.因此,提出利用具备主动推送力度强的播存结构来辅助雾架构以实现内容的主动推送.在此基础上,针对边缘内容协同分发,提出一种基于软件定义的内容协同分发机制,具体包括多粒度协同存储机制、软件定义策略和域内多节点协同策略.最后利用原型系统进行实验测试与结果分析,结果验证该机制能够高效减少用户请求时延,提升用户体验.
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