Long-Term Evolution in unlicensed bands (LTE-U) has been considered as an effective way of offloading traffic from licensed bands. This paper discusses the scenarios, requirements and different operation modes of LTE-U. Motivations and benefits of supporting two of the operation modes namely Dual Connectivity(DC) and standalone are discussed. Further, evaluation results of some typical LTE-U scenarios are provided to show the benefits of supporting dual connectivity and standalone modes for LTE-U.
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