Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Dynamic and Incentive Policy for Selecting D2D Mobile Relays   User-to-network relaying enabled via Device-to-Device communications (D2D) is
a promising technique for improving the performance of cellular networks. Since
in practice relays are in mobility, a dynamic relay selection scheme is
unavoidable. In this paper, we propose a dynamic relay selection policy that
maximizes the performance of cellular networks (e.g. throughput, reliability,
coverage) under cost constraints (e.g. transmission power, power budget). We
represent the relays' dynamics as a Markov Decision Process (MDP) and assume
that only the locations of the selected relays are observable. Therefore, the
dynamic relay selection process is modeled as a Constrained Partially Observed
Markov Decision Process (CPOMDP). Since the exact solution of such framework is
intractable to find, we develop a point-based value iteration solution and
evaluate its performance. In addition, we prove the submodularity property of
both the reward and cost value functions and deduce a greedy solution which is
scalable with the number of discovered relays. For the muti-user scenario, a
distributed approach is introduced in order to reduce the complexity and the
overhead of the proposed solution. We illustrate the numerical results of the
scenario where throughput is maximized under energy constraint and evaluate the
gain that the proposed relay selection policy achieves compared to a
traditional cellular network.

27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics