Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal Caching and User Association in Cache-enabled Heterogeneous
  Wireless Networks   Heterogenous wireless networks (Hetnets) provide a powerful approach to meet
the massive growth in traffic demands, but also impose a significant challenge
on backhaul. Caching at small base stations (BSs) and wireless small cell
backhaul have been proposed as attractive solutions to address this new
challenge. In this paper, we consider the optimal caching and user association
to minimize the total time to satisfy the average demands in cached-enabled
Hetnets with wireless backhaul. We formulate this problem as a mixed
discrete-continuous optimization for given bandwidth and cache resources.
First, we characterize the structure of the optimal solution. Specifically, we
show that the optimal caching is to store the most popular files at each pico
BS, and the optimal user association has a threshold form. We also obtain the
closed-form optimal solution in the homogenous scenario of pico cells. Then, we
analyze the impact of bandwidth and cache resources on the minimum total time
to satisfy the average demands. Finally, using numerical simulations, we verify
the analytical results.

9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int