Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-Low Latency for 5G - A Lab Trial   In this paper, we introduce a lab trial that is conducted to study the
feasibility of ultra-low latency for 5G. Using a novel frame structure and
signaling procedure, a stabilized 1.5 ms hybrid automatic repeat request (HARQ)
round trip time (RTT) is observed in lab trial as predicted in theory. The
achieved round trip time is around 5 times shorter compared with what is
supported by LTE-Advanced standard.

25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc