COLLISION AVOIDANCE
A fully-distributed Broadcast protocol in multi-hop Cognitive
Radio ad hoc networks with collision avoidance, BRACER, is proposed. In our
design, we consider practical scenarios that each unlicensed user is not
assumed to be aware of the global network topology, the spectrum availability
information of other users, and time synchronization information. By
intelligently downsizing the original available channel set and designing the
broadcasting sequences and scheduling schemes, our proposed broadcast protocol
can provide very high successful broadcast ratio while achieving very short
average broadcast delay. It can also avoid broadcast collisions. To the best of
our knowledge, this is the first work that addresses the unique broadcasting
challenges in multi-hop CR ad hoc networks with collision avoidance.
Cognitive radio (CR) technology has been proposed as an enabling
solution to alleviate the spectrum underutilization problem. With the
capability of sensing the frequency' bands in a time and location-varying
spectrum environment and adjusting the operating parameters based on the
sensing outcome, CR technology allows an unlicensed user(or, secondary user (SU)) to exploit those frequency bands
unused by licensed users (or, primary users) in an opportunistic manner.
Secondary users can form a CR infrastructure-based network or a CR ad hoc
network. Recently, CR ad hoc networks have attracted plentiful
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