Network Coding for Wireless Cooperative Networks: Simple Rules, Near-optimal Delay

Hana Khamfroush, Daniel Enrique Lucani Roetter, João Barros

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

4 Citations (Scopus)

Abstract

We consider the problem of finding an optimal packet transmission policy that minimizes the total cost of transmitting M data packets from a source S to two receivers R1,R2 over half-duplex, erasure channels. The source can either broadcast random linear network coding (RLNC) packets to the receivers or transmit using unicast sessions at each time slot. We assume that the receivers can share their knowledge with each other by sending RLNC packets using unicast transmissions. We model this problem by using a Markov Decision Process (MDP), where the actions include the source of and type of transmission to be used in a given time slot given perfect knowledge of the system state. We study the distribution of actions selected by the MDP in terms of the knowledge at the receivers, the channel erasure probabilities, and the ratio between the cost of broadcast and unicast. This allowed us to learn from the optimal policy and devise two simple, yet powerful heuristics that are useful in practice. Our heuristics rely on different levels of feedback, namely, sending 1 or 2 feedback packets per receiver per M data packets by choosing the right moment to send this feedback. Our numerical results show that our heuristics are able to achieve the same performance of the MDP solution.
Original languageEnglish
Title of host publicationCommunications Workshops (ICC), 2014 IEEE International Conference on
PublisherIEEE Press
Publication date2014
Pages255-260
ISBN (Print)9781479946402
DOIs
Publication statusPublished - 2014
Event2014 IEEE International Conference on Communications - Sydney , Australia
Duration: 10 Jun 201414 Jun 2014
Conference number: 31675

Conference

Conference2014 IEEE International Conference on Communications
Number31675
CountryAustralia
CitySydney
Period10/06/201414/06/2014
SeriesIEEE International Conference on Communications
ISSN1938-1883

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