  The proliferation of smartphones/mobile devices that support a wide range of
broadband applications and services has driven the volume of mobile data
traffic to an unprecedented high level, requiring a next generation mobile
communication system, i.e., the fifth generation (5G). Millimeter wave bands,
due to the large available spectrum bandwidth, are considered as one of the
most promising approaches to significantly boost the capacity. In this paper,
we define a typical use case envisaged in the early stage of the 5G system
rollout, where users can experience 100M+ data rate in the target area and at
the same time enjoy services demanding extremely high data rates, such as
virtual reality and ultra-high definition video. We then break down the use
case into four different traffic types: web browsing, content sharing, virtual
reality experience and ultra-high definition video, and derive and analyze the
distributions of the required instantaneous data rates for each individual
traffic type. Finally, we consider the case where multiple users with mixture
of traffic types are simultaneously active and analyze the overall data rate
and bandwidth requirements to support such a scenario.
