Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 5G New Radio for Public Safety Mission Critical Communications   Driven by increasing demands on connectivity to improve safety, situational
awareness and operational effectiveness for first responders, more and more
public safety agencies are realizing the need of modernization of their
existing non-3GPP networks. 3GPP based cellular networks offer the unique
opportunity of providing fast, reliable, and prioritized communications for
first responders in a shared network. In this article, we give an overview of
service requirements of public safety mission critical communications. We
identify key technical challenges and explain how 5G NR features are being
evolved to meet the emerging safety critical requirements, including enabling
connectivity everywhere, supporting efficient group communications,
prioritizing mission critical traffic, and providing accurate positioning for
first responders.

14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin