Iterative Relay Scheduling With Hybrid ARQ Under Multiple User Equipment (Type II) Relay Environments

Sung Sik Nam, Mohamed Slim Alouini, Seyeong Choi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In this paper, we propose an iterative relay scheduling with hybrid ARQ (IRS-HARQ) scheme, which realizes fast jump-in/successive relaying and subframe-based decoding under the multiple user equipment (UE) relay environments applicable to the next-generation cellular systems (e.g., LTE-Advanced and beyond). The proposed IRS-HARQ aims to increase the achievable data rate by iteratively scheduling a relatively better UE relay closer to the end user in a probabilistic sense, provided that the relay-To-end user link should be operated in an open-loop and transparent mode. The latter is due to the fact that not only there are no dedicated control channels between the UE relay and the end user, but also a new cell is not created. Under this open-loop and transparent mode, our proposed protocol is implemented by partially exploiting the channel state information based on the overhearing mechanism of acknowledge/negative acknowledge for HARQ. Further, the iterative scheduling enables UE-To-UE direct communication with proximity that offers spatial frequency reuse and energy saving.

Original languageEnglish (US)
Pages (from-to)6455-6463
Number of pages9
JournalIEEE Access
StatePublished - Jan 8 2018

Bibliographical note

Publisher Copyright:
© 2018 IEEE.


  • Dynamic decode-And-forward (DDF)
  • Hybrid ARQ
  • Iterative scheduling
  • Open-loop access link
  • Rateless codes
  • Subframe decoding
  • UE relays

ASJC Scopus subject areas

  • General Engineering
  • General Computer Science
  • General Materials Science


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