Luı́s Henrique M. K. Costa

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This paper presents the design of a plug-in for the Optimized Link State Routing (OLSR) protocol with the Expected Transmission Time (ETT) metric and experiments in an indoor testbed. The ETT metric is implemented as a plug-in, keeping portability and facilitating its deployment on operational networks. Our design identifies important implementation issues.(More)
We performed a comparison of four selected protocols from the literature using microtitre-plate and colorimetric biomass assay for evaluation of enterococci biofilm formation ability and optimized a protocol after the identification and stringent performance of biofilm formation steps. The optimized protocol uses a dynamic model that provided a greater(More)
A wireless ad hoc network is a collection of wireless nodes that can dynamically self-organize into an arbitrary and temporary topology to form a network without necessarily using any pre-existing infrastructure. These characteristics make ad hoc networks well suited for military activities, emergency operations, and disaster recoveries. Nevertheless, as(More)
This paper presents and analyzes a collision avoidance mechanism that increases the throughput and decreases the delay in wireless local area networks. The analysis considers the IEEE 802.11 standard parameters employed in the Distributed Coordination Function used in the Ad Hoc mode operation. The mechanism is based on the Deferral Counter (DC) algorithm(More)
This paper proposes a deepwater monitoring system built with sensors distributed over the subsea pipelines which are responsible for transportation of oil production. Data transmission is undertaken by underwater acoustic modems installed on the sensors and vessels used for logistic support of the oil exploration. However, the vessels may not be within(More)
Internet Service Providers resist innovating in the network core, fearing that deploying a new protocol or service compromises the network operation and their profit, as a consequence. Therefore, a new Internet model, called Future Internet, which enables core innovation, must accommodate new protocols and services with the current scenario, isolating each(More)
The Brazilian government intends to use the Digital TV technology as a vehicle of digital inclusion on underserved communities. The wireless ad hoc network is a low-cost, scalable and easy solution to implement the return channel. This work analyzes the performance of an ad hoc return channel using the wireless IEEE 802.11 technology in different Brazilian(More)
This paper proposes an underwater positioning system built with sensors distributed over the submarine infrastructure responsible for the oil production, which will be located by trilateration of acoustic signals emitted by units (vessels and platforms) with known coordinates. However, the acoustic signals needed to the calculation of the position depend on(More)
This chapter presents IEEE 802.11s, an emerging standard for wireless mesh networks (WMNs). IEEE 802.11s proposes multihop forwarding at the MAC level, which is a new approach for building WMNs. Traditional solutions for WMNs use network-level routing protocols to allow multihop forwarding among wireless mesh nodes. IEEE 802.11s specifies multihop MAC(More)
Ad hoc routing protocols that use broadcast for route discovery may be inefficient if the path between any pair sourcedestination is frequently broken. In order to efficiently use network resources, this paper proposes to use a controlled flooding (CF) mechanism to replace network-wide broadcast in route discovery procedures. CF is used to build alternative(More)