Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beyond the Ultra-Dense Barrier - Paradigm shifts on the road beyond
  1000x wireless capacity   It has become increasingly clear that the current design paradigm for mobile
broadband systems is not a scalable and economically feasible way to solve the
expected future 'capacity crunch', in particular in indoor locations with large
user densities. 'Moore's law', e.g. state-of-the art signal processing and
advanced antenna techniques now being researched, as well as more millimeter
wave spectrum indeed provide more capacity, but are not the answer to the 3-4
orders of magnitude more capacity at today's cost, that is needed.We argue that
solving the engineering problem of providing high data rates alone is not
sufficient. Instead we need to solve the techno-economic problem to find both
business models and scalable technical solutions that provide extreme area
capacity for a given cost and energy consumption. In this paper we will show
that achieving very high capacities is indeed feasible in indoor environments.

37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics