Blockchain envisioned UAV networks: Challenges, solutions, and comparisons Abstract   Unmanned Aerial Vehicles (UAV) or drones is a technology with a huge potential for proving different efficient solutions in the smart city. It has been mostly adopted by military, aviation, civil, and commercial sectors for audio and video surveillance. The communication and security challenges of UAV is well mentioned by researchers and organizations (defense) around the world, although many of the challenges remain unresolved (especially for sensitive and consumerrelated applications). Moreover, the conventional network systems may not be very efficient in dealing with the dynamic requirements of UAVs. As the UAVs are generally deployed in tough environments and terrains, therefore it is quite essential to provide a strong and secure network. Motivated from these facts, this paper presents an extensive survey on security issues in 5Genabled UAV networks as per the literature published till the fourth quarter of 2019. It also presents the taxonomy of existing security issues in 5Genabled UAV networks. Based on the findings from the survey, we present a Blockchain (BC)based security solution and a summary of research challenges in the integration of BC with 5Genabled UAV. Then, we present a case study of implementing BC with UAVs to secure industrial applications.

Discussion on the Application of 5G Network UAV in Public Security of Smart Cities This paper first introduces and implements the functions of the 5G networked UAV. Secondly, combined with 5G mobile communication network, explore the typical applications of 5G network drones in smart cities such as security, rescue, inspection etc., and propose overall solutions for different application scenarios and requirements for 5G communication capabilities of networked drones. Finally, summarize the difficulties and solutions encountered by the current 5G network drones. In summary, the outstanding performance of 5G network UAVs in realtime monitoring, command and dispatch, and collection of data center cloud records and calls makes it an advanced media work platform for decisionmaking level of emergency command. In the future, the management of the entire smart city will play a more important role, providing the government with multiple conveniences for the citizens.