Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancements of the 3GPP LTE-Advanced and the Prized Asset: Dynamic TDD
  Transmissions   In this paper, we perform a survey on new Third Generation Partnership
Project (3GPP) Long Term Evolution-Advanced (LTE-Advanced)
enhancements,covering the technologies recently adopted by the 3GPP in LTE
Release 11 and those being discussed in LTE Release 12. In more details, we
introduce the latest enhancements on carrier aggregation (CA), multiple-input
multiple-output (MIMO) and coordinated multi-point (CoMP) as well as
three-dimensional (3D) MIMO. Moreover, considering that network nodes will
become very diverse in the future, and thus with heterogeneous network (HetNet)
being a key feature of LTE-Advanced networks, we also discuss technologies of
interest in HetNet scenarios, e.g., enhanced physical data control channel
(ePDCCH), further enhanced inter-cell interference coordination (FeICIC) and
small cells, together with energy efficiency concerns. In particular, we pay
special attention to one of the most important enhancements in LTE Release 12,
i.e., dynamic time division duplex (TDD) transmissions, and present performance
results that shed new light on this topic.

9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an