Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revisiting LTE LAA: Channel Access, QoS, and Coexistence with WiFi   Network operators are looking towards LTE License Assisted Access (LAA) as a
means of extending capacity by offloading traffic to unlicensed bands. However,
operation in these bands requires abiding to certain coexistence rules in terms
of channel access. The description of these rules in existing literature is not
always in line with the latest standards. Therefore, in this paper, we clarify
the operation of LAA, focusing on channel access and methods of providing
Quality of Service (QoS) support. In terms of coexistence, we evaluate the
impact of LAA under its various QoS settings on Wi-Fi performance in an
experimental testbed. Finally, we describe the upcoming research challenges for
LTE-based technologies in unlicensed bands considering the latest developments.

10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con