# Multilayered Network Model for Mobile Network Infrastructure Disruption
## 2 Related Work  
In recent years, many studies investigated the possibilities of different networks convergence scenarios. Most of the works include MANET networks, WSN networks, Vehicular Ad-Hoc Networks (VANET) or networks composed of unmanned aerial vehicles (UAVs). [PERSON] et al. [4] proposed a MANET and WSN convergence network model to support a cost-effective realization of wide-scale urban monitoring applications. The authors assumed a tree-based data collection for WSN with generic tree-based protocol to easily enable its deployment and immediate usage with all emerging collection solutions and standard specifications. The MANET network organized in small local clusters acts as a WSN backbone network that allows urgent data to pass.  
[PERSON] et al. [1] described the advances in wireless sensor network (WSN) technology and unmanned aerial vehicles (UAVs) to enhance the ability of network-assisted disaster prediction, assessment, and response. UAVs are responsible for the data collection from fixed WSN sensors deployed in different areas. The authors introduced recommendations for WSN and UAV use during different disaster stages, but there are missing technology and protocol background. In [5], the solution was extended about the measurement of major UAV communication technologies and authors discussed the possible communications technology with Quality of Service (QoS) point of view. A conceptual mobile UAV station for disaster management was proposed as well.  
[PERSON] and [PERSON] [6] propose IoT network hierarchy comprising the Internet, WLAN and/or Internet gateway, MANET and WSN networks. Wireless sensor nodes were deployed in an IoT system that collecting data from the environment and sent them to the gateway node. Data can be directly sent to the Internet at the highest hierarchy level through WLAN Access Point or Internet gateway. MANET nodes are acting as intermediate nodes responsible for collecting data from WSN nodes if the direct Internet gateway is not available. Different communication technologies along with protocol stacks are also discussed [6]. In this work [6] to overcome interference between MANET (Wi-Fi IEEE802.11b) and WSN (ZigBee IEEE802.15.4) communication, the authors defined usable non-overlapping channels for WSN and MANET. Other related works considering convergence scenarios are [7; 8; 9].  
Unlike the research presented above that interconnects different variations of networks, in our proposal, we introduce a convergence scenario that interconnects WSN, MANET, and DRONET networks into a layered model with the ability to collect data and send it to the cloud services for processing. The layers are independent, but in case of network disruption, urgent data can pass layers based on a system of gateways that enables the interconnection of multiple layers. For each network layer, we provide communication technology and routing protocols recommendation. Besides that, our contribution includes the description of necessary changing and exceptions for routing protocol deployed on each layer (i.e., network) that allows the transporting of urgent data through multiple layers in the multilayered network model. In particular, in DRONET layer, we provide a simplified mechanism for UAV management in order to cover MANET nodes by slicing MANET networks into clusters. The main aim of this proposal is to provide a conceptual way for critical data of urgent applications to be continuously delivered in disrupted network scenarios caused by unpredictable situations.