Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A mmWave Bridge Concept to Solve the Cellular Outdoor-to-Indoor
  Challenge   Wireless indoor coverage and data capacity are important aspects of cellular
networks. With the ever-increasing data traffic, demand for more data capacity
indoors is also growing. The lower frequencies of the legacy frequency bands of
macro outdoor cells manage to provide coverage inside buildings, however, new
frequencies foreseen for the 5th generation (5G) of mobile communications in
the millimeter wave (mmWave) spectrum penetrate very poorly into buildings.
Therefore, a massive densification of the network would require to deploy a
large number of indoor small cells, which would lead to high deployment costs
to install the necessary wired/optical backhaul. Hence, other methods are
needed that allow an increase of the data capacity indoors, bearing a lower
cost than a fiber deployment. We propose a cost-efficient out-of-band repeater
architecture that provides more data capacity indoors than an outdoor
macro/micro network can provide to indoor, without adversely affecting a legacy
network, and which readily works with the established cellular infrastructure
as well as standard handsets/smartphones. This proposal is compared to
conventional in- and out-of-band repeaters and relay nodes in order to
highlight the advantages of our solution. While the data capacity for a single
link is similar to that of repeaters and relays, a macro cell can be
effectively offloaded. Cell capacities corresponding to at least 3--4 times
that of a repeater or relay solution can be provided, depending on the number
of parallel installed links and the bandwidth in the mmWave spectrum.

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The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex