In-Band α-Duplex Scheme for Cellular Networks: A Stochastic Geometry Approach

Ahmad AlAmmouri, Hesham Elsawy, Osama Amin, Mohamed Slim Alouini

Research output: Contribution to journalJournal articlepeer-review

35 Scopus citations


In-band full-duplex (FD) communications have been optimistically promoted to improve the spectrum utilization and efficiency. However, the penetration of FD communications to the cellular networks domain is challenging due to the imposed uplink/downlink interference. This paper presents a tractable framework, based on stochastic geometry, to study FD communications in cellular networks. Particularly, we assess the FD communications effect on the network performance and quantify the associated gains. This paper proves the vulnerability of the uplink to the downlink interference and shows that FD rate gains harvested in the downlink (up to 97%) come at the expense of a significant degradation in the uplink rate (up to 94%). Therefore, we propose a novel fine-grained duplexing scheme, denoted as the α-duplex scheme, which allows a partial overlap between the uplink and the downlink frequency bands. We derive the required conditions to harvest rate gains from the α-duplex scheme and show its superiority to both the FD and half-duplex (HD) schemes. In particular, we show that the α-duplex scheme provides a simultaneous improvement of 28% for the downlink rate and 56% for the uplink rate. Finally, we show that the amount of the overlap can be optimized based on the network design objective.

Original languageEnglish
Article number7511737
Pages (from-to)6797-6812
Number of pages16
JournalIEEE Transactions on Wireless Communications
Issue number10
StatePublished - Oct 2016
Externally publishedYes


  • ergodic rate
  • error probability
  • Full duplex
  • half duplex
  • network interference
  • outage probability
  • partial overlap
  • stochastic geometry


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