Iterative Relay Scheduling With Hybrid ARQ Under Multiple User Equipment (Type II) Relay Environments
- Authors
- Nam, Sung Sik; Alouni, Mohamed-Slim; Choi, Seyeong
- Issue Date
- Jan-2018
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- UE relays; open-loop access link; dynamic decode-and-forward (DDF); iterative scheduling; hybrid ARQ; rateless codes; subframe decoding
- Citation
- IEEE ACCESS, v.6, pp.6455 - 6463
- Journal Title
- IEEE ACCESS
- Volume
- 6
- Start Page
- 6455
- End Page
- 6463
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/78657
- DOI
- 10.1109/ACCESS.2018.2791520
- ISSN
- 2169-3536
- Abstract
- 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.
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