  Fifth Generation (5G) wireless networks are designed to meet various end-user
Quality of Service (QoS) requirements through high data rates (typically of
Gbps order) and low latencies. Coupled with Fog and Mobile Edge Computing
(MEC), 5G can achieve high data rates, enabling complex autonomous smart city
services such as the large deployment of self-driving vehicles and large-scale
Artificial Intelligence (AI)-enabled industrial manufacturing. However, to meet
the exponentially growing number of connected IoT devices and irregular data
and service requests in both low and highly dense locations, the process of
enacting traditional cells supported through fixed and costly base stations
requires rethought to enable on-demand mobile access points in the form of
Unmanned Aerial Vehicles (UAV) for diversified smart city scenarios. This
article envisions a 5G network environment that is supported by
blockchain-enabled UAVs to meet dynamic user demands with network access
supply. The solution enables decentralized service delivery (Drones as a
Service) and routing to and from end-users in a reliable and secure manner.
Both public and private blockchains are deployed within the UAVs, supported by
fog and cloud computing devices and data centers to provide wide range of
complex authenticated service and data availability. Particular attention is
paid tocomparing data delivery success rates and message exchange in the
proposed solution against traditional UAV-supported cellular networks.
Challenges and future research are also discussed with highlights on emerging
technologies such as Federated Learning.
