Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of Non-Terrestrial Networks From 5G to 6G: A Survey   Non-terrestrial networks (NTNs) traditionally had certain limited
applications. However, the recent technological advancements opened up myriad
applications of NTNs for 5G and beyond networks, especially when integrated
into terrestrial networks (TNs). This article comprehensively surveys the
evolution of NTNs highlighting its relevance to 5G networks and essentially,
how it will play a pivotal role in the development of 6G and beyond wireless
networks. The survey discusses important features of NTNs integration into TNs
by delving into the new range of services and use cases, various architectures,
and new approaches being adopted to develop a new wireless ecosystem. Our
survey includes the major progresses and outcomes from academic research as
well as industrial efforts. We first start with introducing the relevant 5G use
cases and general integration challenges such as handover and deployment
difficulties. Then, we review the NTNs operations in mmWave and their potential
for the internet of things (IoT). Further, we discuss the significance of
mobile edge computing (MEC) and machine learning (ML) in NTNs by reviewing the
relevant research works. Furthermore, we also discuss the corresponding higher
layer advancements and relevant field trials/prototyping at both academic and
industrial levels. Finally, we identify and review 6G and beyond application
scenarios, novel architectures, technological enablers, and higher layer
aspects pertinent to NTNs integration.

26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
2
The categories of this paper are: math
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph