Zusammenfassung
With reference to road transport information (RTI) applications,
such as cooperative driving, short-range intervehicle communications in
a highway environment are investigated in this paper. The research in
this field indicates the suitability of the 60-64-GHz band. Due to the
distributed nature of the intervehicle communication system, an R-ALOHA
protocol is considered; multihop (MH) and single-hop (SH) strategies are
compared. Network performance is assessed by considering the joint
impact of random access, interference, thermal noise, propagation, and
packet capture effect. Several figures of merit are analyzed and
discussed: packet success probability (PSP), system stabilization time
(SST), first success time (FST), and deadline failure probability (DFP).
Network performance is evaluated either by an analytical approach or by
a software tool able to simulate a one-lane highway scenario. Both
steady-state and transition situations are considered. System
performance in terms of PSP (in the presence of two-way Rice fading,
noise, and interference with antenna diversity and selection combining)
is analytically evaluated to validate the simulation tool and to prove
the suitability of an MH network strategy. The simulation approach
allows the evaluation of the impact of protocol parameters on network
performance, with reference to nonsteady-state situations
Nutzer