Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joint Uplink/Downlink Resource Allocation and Data Offloading in
  OFDMA-Based Wireless Powered HetNets   This paper considers joint uplink/downlink of an orthogonal frequency
division multiple access (OFDMA)-based heterogeneous network (HetNet)
consisting of a single macro base station (MBS), multiple femto base stations
(FBSs) and access points (APs) where base stations (BSs) can offload data to
APs and each mobile user (MU) is able to harvest the received energy using the
simultaneous wireless information and power transfer (SWIPT) technique. We also
suppose that the harvested energy of MUs are used for their uplink information
transmission. We devise a radio resource allocation (RRA) algorithm to maximize
the uplink sum data rate of MUs subject to a minimum required downlink data
rate of each MU and maximum allowable transmit power of each BS, AP, and MU.
More specifically, both the frequency division duplex (FDD) and time division
duplex (TDD) schemes are investigated. The proposed non-convex optimization
problems are solved using an iterative algorithm. It is also proved that the
proposed algorithm converges to a near-optimal solution. Simulation results
illustrate that the TDD scheme improves the performance compared to the FDD
scheme. In addition, it is shown that utilizing the data offloading technique
improves the uplink sum data rate of MUs compared to the scenario without any
AP.

14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex