A wide range of multimedia services is expected to be offered for mobile users via various\nwireless access networks. Even the integration of Cloud Computing in such networks does not\nsupport an adequate Quality of Experience (QoE) in areas with high demands for multimedia\ncontents. Fog computing has been conceptualized to facilitate the deployment of new services that\ncloud computing cannot provide, particularly those demanding QoE guarantees. These services\nare provided using fog nodes located at the network edge, which is capable of virtualizing their\nfunctions/applications. Service migration from the cloud to fog nodes can be actuated by request\npatterns and the timing issues. To the best of our knowledge, existing works on fog computing focus\non architecture and fog node deployment issues. In this article, we describe the operational impacts\nand benefits associated with service migration from the cloud to multi-tier fog computing for video\ndistribution with QoE support. Besides that, we perform the evaluation of such service migration of\nvideo services. Finally, we present potential research challenges and trends
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