Performance evaluation of next generation wireless UAV relay with millimeter-wave in access and backhaul

Khan, S 2019, Performance evaluation of next generation wireless UAV relay with millimeter-wave in access and backhaul, Masters by Research, Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Performance evaluation of next generation wireless UAV relay with millimeter-wave in access and backhaul
Author(s) Khan, S
Year 2019
Abstract Future wireless communication, particularly densified 5G networks, will bring numerous innovations to the telecommunication industry and will support 100-fold gain in throughput rates, 100-fold in capacity (for at least 100 billion devices), individual user data rate of up-to 10 Gb/s, extremely low latency and response times. In such a scenario, the use of Unmanned Aerial Vehicle (UAV) as a Base Station (gNB) becomes a viable option for providing 5G services, both on-demand and on a regular basis. Recent development of UAVs have made its deployment faster and reliable, resulting in a shift in its usage from traditional military to more commercial and corporate industries. On the other hand, due to the abundant availability of bandwidth in the millimeter-wave band (mmWave), there is an immense potential to utilize this band for next generation radio systems. In this case, smart integration of UAVs in 5G network provides immense potential, however, such network require efficient placement mechanism for providing blazingly fast wireless cellular network services. In this study, we analyze and describe the distinctive characteristics of mmWave propagation. The main goal is to investigate and evaluate the use of mmWave in Access and Back-haul communication links simultaneously for Amplify-and-Forward relays deployed on UAVs. We formulate the required mathematical framework for calculating the UE received power for direct path (gNB-UE) and relay path (gNB-UAV-UE) based on two cases; (i) Friis Transmission Equation and (ii) Log-Distance Path loss Model. We conduct simulations using ray-tracing simulator in different scenarios while comparing and verifying the simulation results vs mathematical equations. For the proposed system architecture, International Telecommunication Union (ITU) recommendation city model is used to calculate the probability for Line of Sight (LoS) and Non Line of Sight (NLoS) paths in different urban environments. Furthermore, we study and identify different parameters i.e., UAV location, and amplification factor to maximize the performance of an Amplify-and-Forward UAV based relay for providing enhanced coverage to the users. Similarly, the optimum UAV-gNB height is evaluated in different urban environments while providing coverage to the users via an Amplify-and-Forward relay. The study concludes with the Signal to Noise Ratio (SNR) analysis for the relay path compared with the direct path where we identify the constraints for effective relaying.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Engineering
Keyword(s) 5G
unmanned aerial vehicle
millimeter wave
signal to noise ratio
UAV location
amplification factor direct path
relay path
ray tracing simulations
future wireless communication
enhanced coverage
amplify and forward relay
line of sight and non line of sight paths
different urban environments
next generation radio systems
efficient placement mechanism
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Created: Mon, 11 Nov 2019, 13:37:58 EST by Keely Chapman
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