Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joint Optimization of User Association, Data Delivery Rate and Precoding
  for Cache-Enabled F-RANs   This paper considers the downlink of a cache-enabled fog radio access network
(F-RAN) with limited fronthaul capacity, where user association (UA), data
delivery rate (DDR) and signal precoding are jointly optimized. We formulate a
mixed-integer nonlinear programming problem in which the weighted difference of
network throughput and total power consumption is maximized, subject to the
predefined DDR requirements and the maximum transmit power at each eRRH. To
address this challenging problem, we first apply the l0-norm approximation and
l1-norm minimization techniques to deal with the UA. After this key step, we
arrive at an approximated problem that only involves the joint optimization of
DDR and precoding. By using the alternating descent method, we further
decompose this problem into a convex subproblem for DDR allocation and a
nonconvex subproblem for precoding design. While the former is globally solved
by the interior-point method, the latter is solved by a specifically tailored
successive convex quadratic programming method. Finally, we propose an
iterative algorithm for the original joint optimization that is guaranteed to
converge. Importantly, each iteration of the developed algorithm only involves
solving simple convex problems. Numerical examples demonstrate that the
proposed design significantly improves both throughput and power performances,
especially in practical F-RANs with limited fronthaul capacity. Compared to the
sole precoder design for a given cache placement, our joint design is shown to
improve the throughput by 50% while saving at least half of the total power
consumption in the considered examples.

15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th