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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,...
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