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  • Open Access

    ARTICLE

    Throughput Analysis of HARQ Scheme Based on Full-Duplex Two-Way AF SWIPT Relay

    Xiaoye Shi1,*, Fei Ding1,2, Haiting Zhu1, Zhaowei Zhang1, Lei Zhang1

    CMC-Computers, Materials & Continua, Vol.74, No.3, pp. 4819-4830, 2023, DOI:10.32604/cmc.2023.018637

    Abstract The simultaneous wireless information and power transfer (SWIPT) relay system is one of the emerging technologies. Xiaomi Corporation and Motorola Inc. recently launched indoor wireless power transfer equipment is one of the most promising applications. To tap the potential of the system, hybrid automatic repeat request (HARQ) is introduced into the SWIPT relay system. Firstly, the time slot structure of HARQ scheme based on full duplex two-way amplify and forward (AF) SWIPT relay is given, and its retransmission status is analyzed. Secondly, the equivalent signal-to-noise ratio and outage probability of various states are calculated by approximate simplification. Thirdly, the energy… More >

  • Open Access

    ARTICLE

    HARQ Optimization for PDCP Duplication-Based 5G URLLC Dual Connectivity

    Changsung Lee1,3, Junsung Kim2,3, Jaewook Jung3, Jungsuk Baik3, Jong-Moon Chung3,*

    CMC-Computers, Materials & Continua, Vol.72, No.1, pp. 727-738, 2022, DOI:10.32604/cmc.2022.024824

    Abstract Packet duplication (PD) with dual connectivity (DC) was newly introduced in the 5G New Radio (NR) specifications to meet the stringent ultra reliable low latency communication (URLLC) requirements. PD technology uses duplicated packets in the packet data convergence protocol (PDCP) layer that are transmitted via two different access nodes (ANs) to the user equipment (UE) in order to enhance the reliability performance. However, PD can result in unnecessary retransmissions in the lower layers since the hybrid automatic retransmission request (HARQ) operation is unaware of the transmission success achieved through the alternate DC link to the UE. To overcome this issue,… More >

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