Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Base-Station Assisted Device-to-Device Communications for
  High-Throughput Wireless Video Networks   We propose a new scheme for increasing the throughput of video files in
cellular communications systems. This scheme exploits (i) the redundancy of
user requests as well as (ii) the considerable storage capacity of smartphones
and tablets. Users cache popular video files and - after receiving requests
from other users - serve these requests via device-to-device localized
transmissions. The file placement is optimal when a central control knows a
priori the locations of wireless devices when file requests occur. However,
even a purely random caching scheme shows only a minor performance loss
compared to such a genie-aided scheme. We then analyze the optimal
collaboration distance, trading off frequency reuse with the probability of
finding a requested file within the collaboration distance. We show that an
improvement of spectral efficiency of one to two orders of magnitude is
possible, even if there is not very high redundancy in video requests.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio