The article "Survey of Important Issues in UAV Communication Networks" by Lav Gupta, Raj Jain, and Gabor Vaszkun discusses the challenges and opportunities in developing stable and reliable communication networks for Unmanned Aerial Vehicles (UAVs). UAVs have significant potential in public and civil domains, particularly in applications where human lives are at risk. Multi-UAV systems can complete missions more efficiently and economically compared to single UAV systems, but several issues need to be addressed before these systems can be effectively utilized. The authors highlight that existing research in Mobile Ad Hoc Networks (MANETs) and Vehicular Ad Hoc Networks (VANETs) does not fully address the unique characteristics of UAV networks, such as dynamic topology, intermittent links, and power constraints. Key issues discussed include: 1. **Network Topology and Mobility**: UAV networks are characterized by fluid topology, intermittent links, and varying speeds of UAVs, which pose challenges for routing and network management. 2. **Energy Efficiency**: Limited energy resources in UAVs require protocols that optimize energy consumption and extend the network's lifespan. 3. **Seamless Handover**: The dynamic nature of UAV networks necessitates seamless handovers between failed or out-of-service UAVs and active ones. 4. **Routing Protocols**: Traditional routing protocols used in MANETs and VANETs are not suitable for UAV networks due to their high mobility, dynamic topology, and intermittent links. New protocols are needed to handle these challenges. 5. **Software Defined Networking (SDN)**: SDN can facilitate flexible deployment and management of new services, reduce costs, and enhance security and availability in UAV networks. The article also provides a detailed characterization of UAV networks, categorizing them based on application requirements and network architecture. It discusses the advantages of multi-UAV systems and the challenges of self-organization, disruption tolerance, and SDN control. The authors emphasize the need for research in routing protocols, seamless handover procedures, and energy efficiency to build successful UAV networks.The article "Survey of Important Issues in UAV Communication Networks" by Lav Gupta, Raj Jain, and Gabor Vaszkun discusses the challenges and opportunities in developing stable and reliable communication networks for Unmanned Aerial Vehicles (UAVs). UAVs have significant potential in public and civil domains, particularly in applications where human lives are at risk. Multi-UAV systems can complete missions more efficiently and economically compared to single UAV systems, but several issues need to be addressed before these systems can be effectively utilized. The authors highlight that existing research in Mobile Ad Hoc Networks (MANETs) and Vehicular Ad Hoc Networks (VANETs) does not fully address the unique characteristics of UAV networks, such as dynamic topology, intermittent links, and power constraints. Key issues discussed include: 1. **Network Topology and Mobility**: UAV networks are characterized by fluid topology, intermittent links, and varying speeds of UAVs, which pose challenges for routing and network management. 2. **Energy Efficiency**: Limited energy resources in UAVs require protocols that optimize energy consumption and extend the network's lifespan. 3. **Seamless Handover**: The dynamic nature of UAV networks necessitates seamless handovers between failed or out-of-service UAVs and active ones. 4. **Routing Protocols**: Traditional routing protocols used in MANETs and VANETs are not suitable for UAV networks due to their high mobility, dynamic topology, and intermittent links. New protocols are needed to handle these challenges. 5. **Software Defined Networking (SDN)**: SDN can facilitate flexible deployment and management of new services, reduce costs, and enhance security and availability in UAV networks. The article also provides a detailed characterization of UAV networks, categorizing them based on application requirements and network architecture. It discusses the advantages of multi-UAV systems and the challenges of self-organization, disruption tolerance, and SDN control. The authors emphasize the need for research in routing protocols, seamless handover procedures, and energy efficiency to build successful UAV networks.