Iterative Relay Scheduling with Hybrid ARQ under Multiple User Equipment (Type II) Relay Environments

Sung Sik Nam, Mohamed-Slim Alouini, Seyeong Choi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


In this work, 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 ACK/NACK 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 9 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by Wonkwang University in 2017.


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