Infotainment applications may use the
conventional IPv4 and IPv6 protocol stack, encapsulating IP
packets into Geocast packets and tunneling over the ad-hoc
network. Common to other safety applications, STS relies on
the Geocast features to provide communication among OBUs
over IEEE 802.11p radio. Geocast is a routing protocol that
provides single or multi-hop communication over the adhoc
network and implements geographical forwarding that
can address a node by its geographical position or multiple
nodes in a geographical region. Geocast also implements
topological-scoped broadcast to forward data packets from
a source to all nodes located at a distance of n-hops.