Optimal buffer-aided relaying with imperfect CSI

Vahid Jamali, Noha Waly, Nikola Zlatanov, Robert Schober

Research output: Contribution to journalArticleOtherpeer-review

11 Citations (Scopus)


In this letter, we consider a two-hop relay channel that consists of a source, a half-duplex decode-and-forward relay, and a destination. We derive the optimal buffer-aided relaying policy based on imperfect channel state information (CSI) and under long-term per-node power constraints for the source and the relay. In particular, the proposed protocol determines the optimal state of the relay node, namely, the transmit, receive, or silent state, based on the imperfect CSI of the involved links, the quality of the CSI, and the required acquisition overhead. Our simulation results verify the analysis and reveal that there is an optimal tradeoff between the required acquisition overhead and the quality of the CSI that maximizes the throughput.

Original languageEnglish
Article number7460880
Pages (from-to)1309-1312
Number of pages4
JournalIEEE Communications Letters
Issue number7
Publication statusPublished - 8 Jul 2016


  • Adaptive link selection
  • Buffer-aided relaying
  • Imperfect CSI
  • CSI acquisition overhead
  • Outage probability

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