One of the primary application scenarios for mobile wireless multi-hop networks are disaster areas. However, these pose specific challenges for routing, such as mobility and highly unpredictable links. The main applications for disaster area networks - group-based voice communication and group-oriented, map-based tracking - can be realized using multicast groups. Thus, we decided to implement ODMRP for disaster area deployments. In several disaster area maneuver on-site deployments, we identified the need for extensions, making the protocol more suitable for real-world deployments. In this paper, we propose three extensions to ODMRP: (1) link quality based routing, (2) prioritization of control messages, and (3) overhead reduction mechanisms. In simulations as well as in real-world measurements, we show the benefit of the extensions proposed
In this paper, we present novel approaches to routing in tactical networks. We combine recent advances in OLSR development regarding modularization, scalability, extensibility, and metrics with a node architecture concept based on radio and router separation adopted to tactical networks. This node architecture consists of a single router with several external radios acting as wireless bridges and connecting to the router via standard Ethernet. Furthermore, we propose the use of our Directional Airtime (DAT) routing metric that is suitable for the heterogeneous link characteristics often found in tactical networks. In addition, we present some enhanced features unique to our implementation that include means to increase the self-configuration capabilities in IPv4, IPv6, and dual-stack configurations. For the protocol evaluation we used a physical testbed consisting of over 20 nodes implementing our tactical node design
Public safety organizations need robust communication networks to transmit different kind of sensor information. These networks must be reliable even when all infrastructure has been destroyed. Wireless multi-hop networks (such as Mobile Ad-Hoc Networks (MANETs), Wireless Sensor Networks (WSNs), and Wireless Mesh Networks (WMNs)) are supposed to meet the requirements of (1) spontaneous deployment, (2) being independent of any kind of existing infrastructure, and (3) robustness in the sense of selforganization and self-healing by their very definition. These networks have been a topic in research for more than a decade now. Recently, real-world tests and deployments provide valuable insights concerning challenges and future research directions. There are different mesh and WSN testbeds (e.g., [4,9,10]) enabling the research community to run tests in static real-world networks. However, concerning public safety requirements, there are significant differences: (1) No spontaneous deployment, (2) no or at least no mobility typical for public safety, (3) no typical applications and traffic for public safety scenarios. Due to these characteristics, developing algorithms and protocols for public safety scenarios and deploying public safety networks is a huge challenge.To overcome this challenge, we developed a prototype based on commercial off-the-shelf (COTS) hardware. The prototype comprises typical public safety application and is spontaneously deployable. Furthermore, this prototype enables us to perform evaluations with real public safety endusers, e.g. by deploying the prototype in maneuvers. In our demo, we will demonstrate our COTS-based prototype.
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