  Collisions between vehicles and pedestrians usually result in the fatality to
the vulnerable road users (VRUs). Thus, new technologies are needed to be
developed for protecting the VRUs. Based on the high density of pedestrians and
limited computing capability of base stations, in this paper the cloud
computing technologies are adopted to handle the huge amounts of
safety-critical messages. Moreover, the wireless multi-hop backhaul technology
is adopted to overcome the bottlenecks of limited transmission capability and
queueing delay of the transmitted safety-critical messages between base
stations and clouds. Based on the multi-hop wireless transmission scheme, the
signal transmission success probability and delay between pedestrians and
clouds are derived for performance analysis. Furthermore, numerical simulations
are performed to illustrate the relationship between the transmission success
probability and the received signal to interference plus noise ratio (SINR)
threshold.
