Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What Will 5G Be?   What will 5G be? What it will not be is an incremental advance on 4G. The
previous four generations of cellular technology have each been a major
paradigm shift that has broken backwards compatibility. And indeed, 5G will
need to be a paradigm shift that includes very high carrier frequencies with
massive bandwidths, extreme base station and device densities and unprecedented
numbers of antennas. But unlike the previous four generations, it will also be
highly integrative: tying any new 5G air interface and spectrum together with
LTE and WiFi to provide universal high-rate coverage and a seamless user
experience. To support this, the core network will also have to reach
unprecedented levels of flexibility and intelligence, spectrum regulation will
need to be rethought and improved, and energy and cost efficiencies will become
even more critical considerations. This paper discusses all of these topics,
identifying key challenges for future research and preliminary 5G
standardization activities, while providing a comprehensive overview of the
current literature, and in particular of the papers appearing in this special
issue.

32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex