Abstract
Due to their high mobility, unmanned aerial vehicles (UAVs) can offer better connectivity by complement or replace with the existing terrestrial base stations (BSs) in the mobile cellular networks. In particular, introducing UAV and millimeter wave (mmWave) technologies can better support the future wireless networks with requirements of high data rate, low latency, and seamless connectivity. However, it is widely known that mmWave signals are susceptible to blockages because of their poor diffraction. In this context, we consider macro-diversity achieved by the multiple UAV BSs, which are randomly distributed in a spherical swarm. Using the widely used channel model incorporated with the distance-based random blockage effects, which is proposed based on stochastic geometry and random shape theory, we investigate the outage performance of the mmWave UAV swarm network. Further, based on our analysis, we show how to minimize the outage rate by adjusting various system parameters such as the size of the UAV swarm relative to the distance to the receiver.
Highlights
Unmanned aerial vehicle (UAV)-assisted communications have attracted significant research attention as a promising technology to support emergent and ad hoc communications for the ground and low-altitude users by deploying unmanned aerial vehicles (UAVs) [1,2,3,4]
Deploying as a group, UAV swarm can be used to retrieve a line-of-sight (LoS) path to users, which can provide better connectivity to users compared to terrestrial base stations (BSs), because terrestrial BSs frequently suffer from physical obstacles such as buildings and mountains
We present the statistics of the distance between an arbitrary UAV BS in a sphere-shaped swarm to the user
Summary
Unmanned aerial vehicle (UAV)-assisted communications have attracted significant research attention as a promising technology to support emergent and ad hoc communications for the ground and low-altitude users by deploying UAVs [1,2,3,4]. Deploying as a group, UAV swarm can be used to retrieve a line-of-sight (LoS) path to users, which can provide better connectivity to users compared to terrestrial BSs, because terrestrial BSs frequently suffer from physical obstacles such as buildings and mountains When it comes to millimeter-wave (mmWave) communication, this blockage by the obstacles become more critical compared to sub-6 GHz frequency bands. The probability that the blockage-free LoS path exists is an exponentially decreasing function of the Euclidean distance between the transmitter and the receiver This model has been widely used to analyze the mmWave network performance as in [18,19,20,21].
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