Achievable rates for the fading half-duplex single relay selection network using buffer-aided relaying

Nikola Zlatanov, Vahid Jamali, Robert Schober

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)


In the half-duplex single relay selection network, comprised of a source, M half-duplex relays, and a destination, only one relay is active at any given time, i.e., only one relay receives or transmits, and the other relays are inactive, i.e., they do not receive nor transmit. The capacity of this network, when all links are affected by independent slow time-continuous fading and additive white Gaussian noise (AWGN), is still unknown, and only achievable average rates have been reported in the literature so far. In this paper, we present new achievable average rates for this network, which are larger than the best known average rates. These new average rates are achieved with a buffer-aided relaying protocol. Since the developed buffer-aided protocol introduces unbounded delay, we also devise a buffer-aided protocol which limits the delay at the expense of a decrease in rate. Moreover, we discuss the practical implementation of the proposed buffer-aided relaying protocols and show that they do not require more resources for channel state information acquisition than the existing relay selection protocols.
Original languageEnglish
Article number7084188
Pages (from-to)4494-4507
Number of pages14
JournalIEEE Transactions on Wireless Communications
Issue number8
Publication statusPublished - Aug 2015
Externally publishedYes


  • Buffer-aided relaying
  • Half-duplex
  • Relay selection
  • Achievable rate

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