Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extreme coverage in 5G Narrowband IoT: a LUT-based strategy to optimize
  shared channels   One of the main challenges in IoT is providing communication support to an
increasing number of connected devices. In recent years, narrowband radio
technology has emerged to address this situation: Narrowband Internet of Things
(NB-IoT), which is now part of 5G. Supporting massive connectivity becomes
particularly demanding in extreme coverage scenarios such as underground or
deep inside buildings sites. We propose a novel strategy for these situations
focused on optimizing NB-IoT shared channels through the selection of link
parameters: modulation and coding scheme, as well as the number of repetitions.
These parameters are established by the base station (BS) for each block
transmitted until reaching a target block error rate (BLER_t ). A wrong
selection of these magnitudes leads to radio resource waste and a decrease in
the number of possible concurrent connections. Specifically, our strategy is
based on a look-up table (LUT) scheme which is used for rapidly delivering the
optimal link parameters given a target QoS. To validate our proposal, we
compare with alternative strategies using an open source NB-IoT uplink
simulator. The experiments are based on transmitting blocks of 256 bits using
an AWGN channel over the NPUSCH. Results show that, especially under extreme
conditions, only a few options for link parameters are available, favoring
robustness against measurement uncertainties. Our strategy minimizes resource
usage in all scenarios of acknowledged mode and remarkably reduces losses in
the unacknowledged mode, presenting also substantial gains in performance. We
expect to influence future BS software design and implementation, favoring
connection support under extreme environments.

10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int