Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joint Base Station Activation and Coordinated Downlink Beamforming for
  HetNets: Efficient Optimal and Suboptimal Algorithms   In cellular heterogeneous networks (HetNets), a number of distributed base
stations cooperatively provide services to multiple mobile users. This paper
addresses joint base-station activation and coordinated beamforming design for
downlink transmission in HetNets. To this end, a mixed integer program is
formulated to optimize the total power consumption of a HetNet. A novel
approach based on Benders' decomposition is then put forth to obtain the
optimal solution for the problem of interest with guaranteed convergence.
Building on our new formulation, a dual-subgradient algorithm is also proposed
to find an approximate solution in polynomial time. The proposed approaches can
be generalized to more general setups, including robust beamforming designs
under channel uncertainty, and coordinated beamforming for multi-cell
scenarios.

4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
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
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ