Ultra-Reliable and Low-Latency Communications in 5G Downlink: Physical Layer Aspects

By Hyoungju Ji, Sunho Park, Jeongho Yeo, Younsun Kim, Juho Lee, Byonghyo Shim. IEEE wireless communications, 2017

506 citations recorded by the source corpus.

URLLC is a new service category in 5G to accommodate emerging services and applications having stringent latency and reliability requirements. In order to support URLLC, there should be both evolutionary and revolutionary changes in the air interface named 5G NR. In this article, we provide an up-to-date overview of URLLC with an emphasis on the physical layer challenges and solutions in 5G NR downlink. We highlight key requirements of URLLC and then elaborate the physical layer issues and enabling technologies including packet and frame structure, scheduling schemes, and reliability improvement techniques, which have been discussed in the 3GPP Release 15 standardization.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/226769c8acab2c2952823355f3339d8a1dd237e2

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In Computer Networks and Communications

In Electrical and Electronic Engineering

Citations in the corpus

Stochasticity and Skip Connection Improve Knowledge Transfer (2021, background): “In recent years, we have witnessed great success in deep neural networks (DNN) in various applications such as driverless vehicles and drone-based deliveries, smart cities and factories, remote medical diagnosis and surgery, and artificial intelligencebased personalized assistants [1]–[6].”
A Survey on Low Latency Towards 5G: RAN, Core Network and Caching Solutions (2017, background): “In mission critical communication (MCC)/ultra reliable low latency communication (uRLLC2,) both the latency and reliability issues need to be addressed [6], [7].”
A Comprehensive Overview on 5G-and-Beyond Networks With UAVs: From Communications to Sensing and Intelligence (2020, background): “• Ultra-reliable and low-latency communications (URLLC) which aims to support mission-critical applications such as remote surgery, autonomous vehicles, and the Tactile Internet, requiring both ultra-high reliability and short delay [13], [14].”
User-Centric Cell-Free Massive MIMO Networks: A Survey of Opportunities, Challenges and Solutions (2021, background): “The hardware of the transmitter and the receiver are not reciprocal in the sense that they can introduce different amplitude scaling and phase shifts on the uplink and down-link channels [144], respectively.”
Wireless Access in Ultra-Reliable Low-Latency Communication (URLLC) (2018, background): “Finally, we note that the interested reader can find further details on design and optimization of 5G for URLLC services in [47], [55].”
A Survey on Mobile Augmented Reality With 5G Mobile Edge Computing: Architectures, Applications, and Technical Aspects (2021, methodology): “To enable extremely low latencies in the range of 1 ms, the entire system should be redesigned [113], including Radio Access Network (RAN), backhaul and storage [114], various diversity sources, design of packets, network topology, access protocols [115].”
Intelligent Resource Slicing for eMBB and URLLC Coexistence in 5G and Beyond: A Deep Reinforcement Learning Based Approach (2020, background): “For example, the work in [3] highlighted the key requirements of URLLC and its physical layer issues.”