Optimization of a relay-assisted link with buffer state information at the source

Ahmed El Shafie, Mohammad Galal Khafagy, Ahmed Sultan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This letter proposes a random-access scheme employed by a source in a three-node network composed of a source, a relay, and a destination. The source knows the exact number of packets at the finite buffer of the relay. Based on this knowledge, the source probabilistically accesses the channel. We consider a fixed-rate transmission and study the cases with and without channel outage state information at the transmitting nodes. We maximize the throughput in both cases and provide numerical results to illustrate and verify the ideas presented in this work.

Original languageEnglish (US)
Article number6924731
Pages (from-to)2149-2152
Number of pages4
JournalIEEE Communications Letters
Issue number12
StatePublished - Dec 1 2014


  • BSI
  • Buffer-aided relay
  • CSI
  • linear-fractional program
  • Markov chain
  • queuing theory

ASJC Scopus subject areas

  • Modeling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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