kumoh national institute of technology
Networked Systems Lab.

Won Jae Ryu, Jae Woo Kim, Soo Young Shin, Dong-Seong Kim, "Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge User of URLLC in Downlink NOMA Systems," IEEE Communications Letters (In revision), 2021
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Date : 2021-02-02
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Non-orthogonal multiple access (NOMA) has a key feature that the cell-center user (CCU) has prior information about the messages of the cell-edge user(CEU) in the same user-pair. It means that CCU can be used for retransmission when the CEU requests retransmission. As ultra-reliability and low-latency communication (URLLC) requires high-reliability constraints (e.g., 99.999%), using CCU for retransmission can be useful to satisfy the reliability constraint. In this study, to ensure the reliability of CEU, cooperative retransmission(CR) scheme for downlink NOMA systems is proposed.