Friday, 12 June 2015 • 09:00 – 18:00

WS-07: Massive Uncoordinated Access Protocols (MASSAP)

Organizer: Enrico Paolini (University of Bologna, Italy)

Uncoordinated multiple access protocols, such as random access ones, represent a key element of communications systems where a very large population of users, each with sporadic and unpredictable activity, need to transmit over a shared medium. Their role is relevant in delay-critical applications, such as interactive satellite communications, real-time machine-type communication, etc. While traditional uncoordinated access protocols treat collisions as a waste and are designed to avoid them, several innovative developments were recently proposed, such as physical layer network coding and various techniques based on successive interference cancellation, where interference is embraced and creatively utilized. A completely new perspective was thus opened for uncoordinated protocols, paving the way to dramatic performance improvements, and rendering the throughput of random access channels competitive with that of coordinated protocols. These new approaches also created a new conceptual relationship with error correcting codes, thereby opening fundamentally new problems for two rather separated research communities.

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