A throughput-delay trade-off in packetized systems with erasures

Mikko Vehkaperä, Muriel Médard

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

22 Citations (Scopus)


In this paper we propose an information theoretic framework for studying coding and throughput optimization for multi-layered packet transmission systems. Our approach assumes that the system is divided into two separate layers: One code word forms a packet at the physical layer and the code at the network layer spans over these packets. At the receiver, the network layer assumes that the decoded packets arriving from the physical layer either have no errors or are marked as deleted. Thus, albeit the packet loss may be caused, for example, by decoding error, congestion or channel conditions, the network layer treats all decoding errors as erasures regardless of the cause. This allows us to view the system at the network layer as transmission over memoryless erasure channel. We study the throughput optimization and code design across the layers under a total code length constraint while taking also into account the network layer imperfections in the transmission. We use random coding error exponents to achieve results that do not depend on specific coding scheme used. The proposed scheme provides also means for investigating important physical layer phenomena, such as, channel model and lower layer error correction coding in the packet erasure models. Our approach extends to fading channels and networks of multiple nodes and by viewing the two layers of coding as a concatenated coding scheme, a comparison between layer-by-layer and joint cross-layer rate optimization can be made, as outlined in this paper.

Original languageEnglish
Title of host publication2005 IEEE International Symposium on Information Theory, ISIT 2005
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Print)0-7803-9151-9
Publication statusPublished - 1 Dec 2005
MoE publication typeA4 Article in a conference publication
Event2005 IEEE International Symposium on Information Theory, ISIT 05 - Adelaide, Australia
Duration: 4 Sept 20059 Sept 2005

Publication series

SeriesIEEE International Symposium on Information Theory. Proceedings


Conference2005 IEEE International Symposium on Information Theory, ISIT 05


Dive into the research topics of 'A throughput-delay trade-off in packetized systems with erasures'. Together they form a unique fingerprint.

Cite this