Barbara Hughes, René Meier, Raymond Cunningham, and Vinny Cahill., Towards real-time middleware for vehicular ad hoc networks., First ACM International Workshop on Vehicular Ad Hoc Networks (VANET 2004), October, ACM, 2004, 95-96.
Applications of inter-vehicle and vehicle-to-roadside
communication that make use of vehicular ad hoc networks
(VANETs) will often require reliable communication that
provides guaranteed real-time message propagation. This paper
describes an event-based middleware, called RT-STEAM. Unlike
other event systems, RT-STEAM does not rely on a centralized
event broker or look-up service while still supporting event
channels providing hard real-time event delivery. RT-STEAM
event filtering can be based on subject, content and/or proximity.
To guarantee real-time communication, we exploit proximitybased
event propagation to guarantee real-time constraints within
the defined proximities only. The proximity within which realtime
guarantees are available is adapted to maintain time bounds
while allowing changes to membership and topology, typical of
VANETs. This Space-Elastic Model of real-time communication
is the first to directly address adaptation in the space domain to
guarantee real-time constraints.
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