Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SDN-enabled MIMO Heterogeneous Cooperative Networks with Flexible Cell
  Association   Small-cell densification is a strategy enabling the offloading of users from
macro base stations (MBSs), in order to alleviate their load and increase the
coverage, especially, for cell-edge users. In parallel, as the network
increases in density, the BS cooperation emerges as an efficient design method
towards the demands for drastic improvement of the system performance against
the detrimental overall interference. In addition, the tiers are enhanced with
cell association policies by introducing the concept of the association
probability. Above this and motivated by the advantages of cooperation among
BSs, the small base stations (SBSs) are enriched with this property in their
design. SBS cooperation allows shedding light into its impact on the cell
selection rules in multi-antenna HetNets. Under these settings,
software-defined networking (SDN) is introduced smoothly to play the leading
role in the orchestration of the network. {In particular, heavy operations such
as the coordination and the cell association are undertaken by virtue of an SDN
controller performing and managing efficiently the corresponding computations
due to its centralized adaptability and dynamicity towards the enhancement and
potential scalability of the network}. In this context, we derive the coverage
probability and the mean achievable rate. Not only we show the outperformance
of BS cooperation over uncoordinated BSs, but we also demonstrate that the SBS
cooperation enables the admittance of more users from the macro-cell BSs
(MBSs). Moreover, we investigate the performance of different transmission
techniques, and we identify the optimal bias in each case when SBSs cooperate.
Finally, we depict that the SBS densification is beneficial until a specific
density value since a further increase does not increase the coverage
probability.

21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol