Random Linear Network Coding for Time Division Duplexing: When To Stop Talking And Start Listening

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

Daniel E. Lucani (Author) FEUP; Milica Stojanovic (Author) FEUP; Muriel Médard (Author) FEUP

Conference proceedings International

Title: IEEE Infocom 2009, Rio de Janeiro, Brazil, April 2009

Pages: 1800-1808

IEEE Infocom 2009, Rio de Janeiro, Brazil, April 2009

Rio de Janeiro, Brazil, April 2009, April 2009

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

CORDIS: Technological sciences > Engineering > Communication engineering > Telecommunications engineering

Other information

Resumo (PT): A new random linear network coding scheme for reliable communications for time division duplexing channels is proposed. The setup assumes a packet erasure channel and that nodes cannot transmit and receive information simultaneously. The sender transmits coded data packets back-to-back before stopping to wait for the receiver to acknowledge (ACK) the number of degrees of freedom, if any, that are required to decode correctly the information. We provide an analysis of this problem to show that there is an optimal number of coded data packets, in terms of mean completion time, to be sent before stopping to listen. This number depends on the latency, probabilities of packet erasure and ACK erasure, and the number of degrees of freedom that the receiver requires to decode the data. This scheme is optimal in terms of the mean time to complete the transmission of a fixed number of data packets. We show that its performance is very close to that of a full duplex system, while transmitting a different number of coded packets can cause large degradation in performance, especially if latency is high. Also, we study the throughput performance of our scheme and compare it to existing half-duplex go-back-N and selective repeat ARQ schemes. Numerical results, obtained for different latencies, show that our scheme has similar performance to the selective repeat in most cases and considerable performance gain when latency and packet error probability is high.

Abstract (EN): A new random linear network coding scheme for reliable communications for time division duplexing channels is proposed. The setup assumes a packet erasure channel and that nodes cannot transmit and receive information simultaneously. The sender transmits coded data packets back-to-back before stopping to wait for the receiver to acknowledge (ACK) the number of degrees of freedom, if any, that are required to decode correctly the information. We provide an analysis of this problem to show that there is an optimal number of coded data packets, in terms of mean completion time, to be sent before stopping to listen. This number depends on the latency, probabilities of packet erasure and ACK erasure, and the number of degrees of freedom that the receiver requires to decode the data. This scheme is optimal in terms of the mean time to complete the transmission of a fixed number of data packets. We show that its performance is very close to that of a full duplex system, while transmitting a different number of coded packets can cause large degradation in performance, especially if latency is high. Also, we study the throughput performance of our scheme and compare it to existing half-duplex go-back-N and selective repeat ARQ schemes. Numerical results, obtained for different latencies, show that our scheme has similar performance to the selective repeat in most cases and considerable performance gain when latency and packet error probability is high.

Language: English

Type (Professor's evaluation): Scientific