Our paper proposes a new quality of service concept for smart home services. We assume that every flat in a house has its own smart computer to perform local services and acts as an interface for the different sensors and actors inside the flat. These smart computers are interconnected using a plain switched Ethernet infrastructure. A central server offers shared services for each user and a gateway realizes Internet access. Based on the defined priority of each service, we present a solution to prevent congestion situations inside the network based on a distributed traffic shaping scheme. Furthermore, the proposed system is not only applicable to the smart home services scenario, it could also be applied to handle similar problems within classic computer networks and many other fields.
Node mobility is one essential feature of mobile networks, especially for delay tolerant networks, where packet delivery is only possible through node movements. In mobile ad hoc networks, mobility adds new challenges to the protocol design. Therefore, realistic movement models are required to evaluate protocol performance. Usually, random node movement is considered for that but this kind of movement is not applicable for first responders in disaster scenarios. Their movements are driven by tactical mission requirements and highly depend on the type of disaster. In this paper, we analyze two different movement scenarios to derive common features as well as differences and present how to use these results to generate generic and at the same time realistic movements for first responders.
Flooding, earthquakes, and other disasters are recent phenomenons which unfortunately occur more and more often. After such occurrences, the infrastructure is likely damaged, but rescue teams need to communicate with each other to plan the rescue missions. Mobile Ad hoc Networks (MANETs) are an efficient and cost-effective opportunity to establish communication, if no working infrastructure is available. However, they come with several challenges, e.g. interruptions due to partitioned MANETs. Delay Tolerant Networks (DTNs) are a possible solution to overcome this problem. Furthermore, rescue missions require reliable communication between different rescue teams and among their team members. In order to efficiently reach all members of a team, multicast is promising. However, guaranteeing that all recipients receive a DTN multicast message is difficult and might consume too much buffer space in the DTN nodes. In this paper, we present our approach of a DTNbased multicast protocol that provides efficient buffer management without neglecting the required reliability. We explain our algorithm to efficiently free the node buffers. Our simulation results will show that our algorithm increases the delivery ratio for different group sizes.Index Terms-Mobile ad hoc networks; delay tolerant networks; reliable multicast; disaster scenario.
Intermittent connectivity is one major challenge for mobile nodes that move between different networks. Existing handover procedures are able to maintain the connectivity, if the communication ranges of the networks overlap. Otherwise, the connection will be lost. This is especially problematic for ehealth applications, when emergency physicians are on the way to a patient and need to stay in contact with him during the journey. Delay tolerant networks provide an option to maintain at least asynchronous communication under such conditions. But the whole network has to support the corresponding protocols, even if they are not needed in fully connected parts of the network. Therefore, we present an approach to provide handover functionality which allows nodes to switch to delay tolerant transmission seamlessly. We will discuss some conceptual aspects before presenting our solution and show the feasibility of our approach for an e-health scenario.
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