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BRACER: A DISTRIBUTED BROADCAST PROTOCOL IN MULTI-HOP COGNITIVE RADIO AD HOC NETWORKS WITH COLLISION AVOIDANCE?

By Admin on

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.

BRACER: A DISTRIBUTED BROADCAST PROTOCOL IN MULTI-HOP COGNITIVE RADIO 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 research attention due to their various applications. Broadcast is an important operation in ad hoc networks, especially in distributed multi-hop multi-channel networks.


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