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In dynamic networks like sparse mobile ad hoc networks used during rescue operations, data and service availability and reachability is crucial. Such dynamic networks can be analysed to identify stable clusters as well as nodes with frequent cluster affiliation changes; these structural and behavioural properties can then be utilised for careful data and service placement and ferry selection. Factors...
Information sharing in dynamic mobile ad-hoc networks is a challenging task. High data availability in the presence of short and long term disconnections can be obtained by replicating shared data. The number of replicas must however be balanced against the cost of consistency management. In the MIDAS Data Space (MDS) we use optimistic replication together with internal versioning of data; this allows...
An approach to information sharing in mobile ad hoc networks (MANETs) used e.g. in rescue operations, is to store on every node a small amount of metadata describing what information resources exist in the network and where they reside, allowing applications to first search locally for information about suitable resources, and next request relevant information from a node that contains the resource...
To increase the availability of mission critical services and information in sparse MANETs with frequent and/or long term network partitions, we aim to develop efficient replication and placement algorithms. The prediction of the neighborhood of a node is one core element in these algorithms. In this paper we present a neighborhood prediction algorithm based on the Sequential Monte Carlo framework,...
Efficient information sharing is very important for emergency and rescue operations. Mobile ad-hoc Networks (MANETs) are often the only network environment for such operations. We have developed the MIDAS data space (MDS) to transparently share information among rescue applications in such environments. To achieve the required level of availability for important information, MDS performs optimistic...
In emergency and rescue operations MANETs can help to increase the efficiency of the collaborative work. The goal is to increase the availability of services and information through resource awareness. The work described in this paper, presents our approach towards prediction of current and future resources available on remote devices. Our solution is based on information extracted from the node's...
In emergency and rescue operations MANETs can help to improve the efficiency of the collaborative work. The goal is to increase the availability of services and information through resource awareness. The work described in this paper, presents our approach towards prediction of current and future resources available on remote devices. Our resource prediction algorithm is based on information extracted...
Web Services technology is being used for increasingly different environments than it was designed for. To facilitate discovery of Web Services in dynamic environments, both service description and distribution of descriptions must be improved. Several research efforts target semantic description of services. However, Semantic Web Service discovery in peer-to-peer-like, dynamic environments where...
In the ad-hoc InfoWare project we investigate middleware solutions for mobile ad-hoc networks (MANETs) used in emergency and rescue situations. One goal in the project is to increase availability of services and information through resource awareness. In this context we regard the ability to predict with a certain confidence the future resource availability as very helpful. The work described in this...
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