Fog-RAN Enabled Multi-Connectivity and Multi-Cell Scheduling Framework for Ultra-Reliable Low Latency Communication

Binod Kharel,Onel L Alcaraz Lopez,Nurul Huda Mahmood,Matti Latva-Aho,Hirley Alves

doi:10.1109/access.2022.3142430

Binod Kharel, Onel L Alcaraz Lopez + Show 3 more

Open Access

https://doi.org/10.1109/access.2022.3142430

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Abstract

Ultra-Reliable Low Latency Communication (URLLC) is a newly introduced service class targeting emerging Internet-of-Things (IoT) application scenarios. This paper assumes an interference-limited Fog Radio Access Network (F-RAN) setup composed of multiple Remote Radio Heads (RRHs) equipped with multiple antennas serving single-antenna users. F-RAN facilitates collaborative solutions while reducing delay by pushing the network capabilities beyond the edge. By leveraging diversity, RRHs may cooperate through silencing, reducing interference, or joint transmission strategies such as maximal ratio transmission. We derive closed-form outage probability expressions and attain their diversity gain. We validate the derived analytical results through extensive numerical simulations. Furthermore, we propose a mini-slots-based scheduling framework to serve URLLC users within their fixed latency budget. In an interference-limited regime with the proposed scheduling framework, we show that a performance gain is superior when RRHs cooperate compared to when they do not. We briefly discuss the cost of reliability, i.e., the impact on the system’s average sum throughput under cooperation. Moreover, numerical results verify that cooperating transmission schemes boost transmission reliability with a significantly improved latency performance at the cost of reduced system’s average sum throughput.

Highlights

Many emerging applications in the domain of the Internet of Things (IoT) require efficient machine-type communications (MTC) to interconnect wirelessly without the need for human intervention [1]
We studied the performance of the Fog Radio Access Network (F-RAN)-enabled framework for Ultra-Reliable Low Latency Communication (URLLC) with Maximum Ratio Transmission (MRT) and silencing diversity schemes in the interference-limited downlink scenarios
The analysis presented demonstrates that the outage probability performance improves with the number of cooperating Remote Radio Heads (RRHs), transmitting antennas at the RRHs, and diversity schemes

Summary

Introduction

Many emerging applications in the domain of the Internet of Things (IoT) require efficient machine-type communications (MTC) to interconnect wirelessly without the need for human intervention [1]. Latency requirements in 5G New Radio (NR) [3] In this context, several mission-critical applications require URLLC services, e.g., factory automation [4], process automation [4], intelligent transportation systems [4], automated guided vehicles (AGV) [5] and smart grids [6]. Several mission-critical applications require URLLC services, e.g., factory automation [4], process automation [4], intelligent transportation systems [4], automated guided vehicles (AGV) [5] and smart grids [6] These applications require high reliability (e.g., 10−5 to 10−9 outage probability depending upon the application) and simultaneously latency budgets of few milliseconds [6]. URC technique is possible via diversity, including Multi-Connectivity (MC) and robust physical layer design

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