  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.
