An analytical model for optimum byte-level and packet-level FEC assignment using buffer dynamics

Authors:
Azfar Moid;Abraham O. Fapojuwo
Affiliations:
Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB, Canada;Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB, Canada
Venue:
Research Letters in Communications - Regular issue
Year:
2008

Citing 3
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Abstract

This letter presents an analytical model that jointly exploits the buffer dynamics of both the sending and receiving nodes to find the optimum number of byte-level and packet-level forward error correction (FEC) units for real-time multimedia transmission over wireless networks. The proposed 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 and network conditions. The accuracy of the proposed model is dependent on two parameters: the variable 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 error probability, which is achieved when the byte-level FEC scheme is supplemented by the packet-level FEC scheme.