TITLE:
A Hierarchical Link Scheme in Multi-Hop VANETs with Delay Analysis for Congestion Scenario
AUTHORS:
Yuanlin Yu, Demin Li, Guanglin Zhang, Xiaolu Zhang
KEYWORDS:
VANETs, Hierarchical Link Scheme, Delay, Congestion Scenario
JOURNAL NAME:
Journal of Computer and Communications,
Vol.4 No.8,
June
17,
2016
ABSTRACT: Vehicular Ad-Hoc Networks (VANETs) as a
part of intelligent transportation systems (ITS) are a new perspective to
settle the traffic problem. Because of the high velocity, variational topology
and such other characters, the link between VANETs and road side unit (RSU) is
unstable. Besides, on account of the high cost of RSU, some places can’t be
covered completely which make the Internet accessing difficult and accessing
delay long. In this paper, we propose a hierarchical link scheme to help
vehicles access the Internet based on delay analysis for congestion scenario.
We select some moving accessing help points (AHPs) from vehicles in VANETs. Two
different hierarchical schemes under the circumstances of whole road covered or
not are proposed. When the RSUs are enough to cover the whole road fully, we
propose the inward progressive hierarchical method. When the RSUs are not
enough to cover the whole road, we propose the outward extend hierarchical
method. According to the delay analysis, we can get the optimal hierarchy
number. This hierarchical link scheme can decrease delay and make all vehicles
access the Internet with delay guarantee. The simulation results indicate that
our proposed hierarchical link scheme in VANETs can decrease the link delay
effectively.