An Analytical Model for Optimum Byte-Level and Packet-Level FEC Assignment Using Buffer Dynamics

摘要

This letter presents an analytical model that jointly exploits the buffer dynamics of both thesending and receiving nodes to find the optimum number of byte-level and packet-level forward errorcorrection (FEC) units for real-time multimedia transmission over wireless networks. Theproposed analytical model first provides an optimum number of FEC units required at the byte-level, and then chooses the number of FEC units at the packet-level based on current channel andnetwork conditions. The accuracy of the proposed model is dependent on two parameters: thevariable deadline-time at the byte-level and fixed round-trip time (RTT) delay at the packet-level.Numerical results demonstrate the effectiveness of the model in reducing the unrecoverable errorprobability, which is achieved when the byte-level FEC scheme is supplemented by the packet-levelFEC scheme.