Speeding Multicast by Acknowledgment Reduction Technique (SMART)
The authors present a novel feedback protocol for wireless broadcast networks that utilize linear network coding. They consider transmission of packets from one source to many receivers over a single-hop broadcast erasure channel. Their method utilizes a predictive model to request feedback only when the probability that all receivers have completed decoding is significant. In addition, their proposed NACK-based feedback mechanism enables all receivers to request, within a single time slot, the number of retransmissions needed for successful decoding. They present simulation results as well as analytical results that show the favorable scalability of their technique as the number of receivers, file size, and packet erasure probability increase.