Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heterogeneous Ultra-Dense Networks with Traffic Hotspots: A Unified
  Handover Analysis   With the ever-growing communication demands and the unceasing miniaturization
of mobile devices, the Internet of Things is expanding the amount of mobile
terminals to an enormous level. To deal with such numbers of communication
data, plenty of base stations (BSs) need to be deployed. However, denser
deployments of heterogeneous networks (HetNets) lead to more frequent
handovers, which could increase network burden and degrade the users
experience, especially in traffic hotspot areas. In this paper, we develop a
unified framework to investigate the handover performance of wireless networks
with traffic hotspots. Using the stochastic geometry, we derive the theoretical
expressions of average distances and handover metrics in HetNets, where the
correlations between users and BSs in hotspots are captured. Specifically, the
distributions of macro cells are modeled as independent Poisson point processes
(PPPs), and the two tiers of small cells outside and inside the hotspots are
modeled as PPP and Poisson cluster process (PCP) separately. A modified random
waypoint (MRWP) model is also proposed to eliminate the density wave phenomenon
in traditional models and to increase the accuracy of handover decision. By
combining the PCP and MRWP model, the distributions of distances from a typical
terminal to the BSs in different tiers are derived. Afterwards, we derive the
expressions of average distances from a typical terminal to different BSs, and
reveal that the handover rate, handover failure rate, and ping-pong rate are
deduced as the functions of BS density, scattering variance of clustered small
cell, user velocity, and threshold of triggered time. Simulation results verify
the accuracy of the proposed analytical model and closed-form theoretical
expressions.

31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph