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In this paper we present VCube-PS, a topic-based Publish/Subscribe system built on the top of a virtual hypercubelike topology. Membership information and published messages to subscribers (members) of a topic group are broadcast over dynamically built spanning trees rooted at the message’s source. For a given topic, delivery of published messages respects causal order. Performance results...
Time synchronization is the most fundamental service to many wireless sensor network applications, which count mainly with low-power devices. This paper focuses in proposing and implementing a time synchronization service for low-power wireless sensor networks using low frequency real-time clocks in each node. This work present the design, implementation and test of an adaptive algorithm, making the...
This paper presents a novel cross-layer anycast medium access control (MAC) protocol for wireless sensor networks (WSNs) based on advanced preamble propagation and geographic routing. The protocol aims at reducing the sleep-delay problem, common in asynchronous preamble-based MAC protocols. When a packet is ready to be transmitted, differently from other state-of-the-art protocols, the preamble sequence...
This paper presents a new routing protocol for opportunistic networks based on sociological movement model. In this movement model, the mobile nodes have the tendency to visit fixed places frequently. Our approach recognizes the encounter places, called hubs, and employs them as base elements for the routing procedure. Nodes visiting frequently two or more hubs are considered carriers and are used...
This paper presents AGA-MAC: an adaptive geographic any cast medium access control (MAC) protocol for wireless sensor networks (WSNs). The protocol aims at reducing the sleep-delay problem of asynchronous preamble-based MAC protocols by selecting opportunistically the next relay node from a set of candidates. The size of the Forwarding Candidate Set (FCS) is influenced by a threshold parameter in...
This paper presents a method for federating disjoint segments of Wireless Sensor Networks (WSNs) in the presence of unbalanced traffic. The approach relies on an Unmanned Aerial Vehicle (UAV) for message ferrying. Network disconnections compromise the system operation, ergo an alternative to mitigate disconnections is important to extend the network lifetime. In our work, a UAV becomes a data mule,...
This paper presents a method for federating disjoint segments of Wireless Sensor Networks (WSNs) using an Unmanned Aerial Vehicle (UAV) for message ferrying. Since network disconnections compromise the system operation, providing an alternative to mitigate disconnections can extend its lifetime. Several other proposals tackle the problem of disconnections by means of redundant deployment or even using...
This article presents a systematic evaluation of a framework based on Genetic Programming (GP) which aims the automatic generation of Wireless Sensor Network (WSN) applications. Developing WSN applications poses a challenge due to massive distribution of the network nodes. The automatic generation of applications reduces drastically costs, since the manual development is a laborious process. In our...
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