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In mobile ad hoc networks (MANETs), locationbased service (LBS) is a typical application. In a LBS, it is valuable for each node to grasp the convex hull of nodes which compose a network by using a convex hull query. However, if the query-issuing node acquires the information on all the nodes, the information on nodes which are not the vertexes of the convex hull is replied, which is unnecessary for...
In mobile ad hoc networks (MANETs), it is effective for mobile nodes to retrieve data items using top-k queries, in which data items are ordered according to a particular attribute score, and the query-issuing node acquires the data items with the k highest scores. However, accurate results may not be acquired in environments where malicious nodes are present. In top-k queries, it is important to...
In this paper, we propose two beacon-less \(k\) NN query processing methods for reducing traffic and maintaining high accuracy of the query result in mobile ad hoc networks (MANETs). In these methods, the query-issuing node first forwards a \(k\) NN query using geo-routing to the nearest node from the point specified by the query (query point). Then, the nearest node from the query point forwards...
In mobile ad hoc networks (MANETs), to acquire only necessary data items, it is effective for each mobile node to retrieve data items using a top-k query. In our previous work, we proposed a routing method for top-k query processing to reduce traffic while keeping highly accurate query result by using a routing table. This method performs query transmission by unicast to each node which contributes...
In mobile ad hoc networks (MANETs), to acquire only necessary data items, it is effective that each mobile node retrieves data items using a top-k query, in which data items are ordered by the score of a particular attribute and the query-issuing mobile node acquires data items with k highest scores. In our previous works, we proposed top-k query processing methods for reducing traffic and also keeping...
In this paper we consider the problem of high accuracy localization of mobile nodes in a multipath-rich environment where sub-meter accuracies are required. We employ a peer to peer framework where the vehicles/nodes can get pairwise multipath-degraded ranging estimates in local neighborhoods together with a fixed number of anchor nodes. The challenge is to overcome the multipath-barrier with redundancy...
Accurately determining the location of mobile wireless sensor nodes in real-time is essential for many purposes. This paper proposes a new and efficient algorithm for localization of mobile node(s) within a WSN. The proposed algorithm, called iterative CCA-MAP (iCCA-MAP), is based on the CCA-MAP algorithm which applies an efficient nonlinear data mapping technique. The latter has been shown to perform...
Composed of mobile nodes, MANETs rely on the entire collaboration of nodes to provide routing and forwarding functions. Most MANET security solutions identify and exclude malicious and selfish nodes. These mechanisms rely on local monitoring tools to detect untrustworthy nodes and then spread trust information through recommendations. In this paper we apply a Bayesian model [1] to improve MANET security...
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