Mauro Fonseca

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A Mobile Ad Hoc Networks (MANET) is a collection of mobile nodes that can communicate with each other using multi hop wireless links without utilizing any fixed based-station infrastructure and centralized management. The topology of a MANET can be very dynamic due to the mobility of mobile nodes. Because of the dynamic topology and wireless link(More)
To adapt the data rate in accordance with the quality of the link, the IEEE 802.11b standard proposes the variable rate shifting functionality. This intrinsic functionality of the 802.11b products progressively degrades the bit rate when a host detects unsuccessful frame transmissions. Furthermore, the basic CSMA/CA channel access method guarantees that the(More)
In this work, we will focus on the work undertaken in the specification of policies, the different notations developed, and how policies are deployed within a managed system. We will motivate, analyze, and classify all major existing policy notations through several criteria and try to consider the consistent merging of their strengths into a more(More)
We propose ZAP, an algorithm for the distributed channel assignment in cognitive radio (CR) networks. CRs are capable of identifying underutilized licensed bands of the spectrum, allowing their reuse by secondary users without interfering with primary users. In this context, efficient channel assignment is challenging as ideally it must be simple, incur(More)
The objective of this work is to propose an architectural solution to achieve an efficient, distributed control and management of DiffServ enabled networks. DiffServ offers a scalable QoS provisioning solution but it introduces a certain amount of complexity in terms of management and control. The proposed solution is an alternative to the client/server(More)
This work proposes a XML-based model for defining service level agreements (SLA). The model has XML elements to define a semantic to represent key performance indicators (KPI) and key quality indicators (KQI) and the relationship between them. Upper and lower thresholds are associated to the indicators in order to indicate warnings or errors conditions. The(More)
The COPS-PR protocol has been defined by the IETF to provide policy provisioning in networks managed through the policy-based network management approach. Although some network players already ship their devices with proper COPS-PR support, there is a trend in the industry and in the IETF of discontinuing COPS-PR as a policy protocol. Meanwhile, two other(More)
We propose a novel protocol to deal with the synchronization problem for multimedia ad hoc networks. Our proposal eliminates the need for hard clock synchronization by implementing a virtual scheme that relies on the desynchronization between nodes. Such a decision is made because of the dynamic nature of the network topology. Therefore, the proposed(More)