Collision Resolution Protocols

00:00 29-05-2006

Multiple Access protocols are distributed algorithms that enable a set of geographically dispersed stations to communicate using a single shared broadcast channel. When two or more stations attempt transmission at the same time, they collide and need to retransmit their data. In traditional protocols (e.g., Aloha CSMA and the like), attempt to resolve collisions are always deferred to the future, with the hope that things will then work out, somehow, but they never do. In this talk we describe multiple access protocols with a different philosophy. In these protocols, called Collision Resolution Protocols (CRP), the efforts are concentrated on resolving collisions as soon as they occur. The basic idea behind these protocols is to exploit in a more sophisticated manner the feedback information that is available to the stations in order to control the retransmission process, so that collisions are resolved more efficiently and without chaotic events.

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