Speeding Multicast by Acknowledgment Reduction Technique (SMART) Enabling Robustness of QoE to the Number of Users
The authors introduce a novel feedback protocol, called SMART, for wireless broadcast networks that use linear network coding. They consider transmission of packets from a single source to many receivers over a single-hop broadcast erasure channel with heterogeneous links. They propose a predictive model to minimize feedback as well as extraneous data transmissions by the source. In addition, they use the method of types to provide a lower bound for the expected total transmission time, and use simulations to show that their protocol operates close to this lower bound. They show that with SMART, counter to conventional wisdom, the average user's QoE improves slightly as the number of users increases.