Mauro Fonseca

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12 OLSR is an optimization over classical link state protocols tailored for mobile ad hoc networks. In this paper, we pro-13 pose the QOLSR protocol which includes quality parameters to the standard OLSR. Three variants of QOLSR are intro-14 duced, taking into account the delay measurement together with the hop count metric. Then, we analyze new heuristics(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)
Ad hoc networks are gaining more and more acceptance due to the potential of applications, the facility to deploy them as well as the cost economy in term of infrastructure. However, they introduce a lot of challenges in term of routing algorithms, QoS assurance, security, management and so on. The aim of this paper is to present a state of art of these(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 desynchro-nization between nodes. Such a decision is made because of the dynamic nature of the network topology. Therefore, the proposed(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)
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)
This paper describes a new framework for the interoperability between ISP management domain for the purpose of satisfying end user requirement based on service level agreements (SLA) set up between a customer and its related ISP and also SLA set up between ISPs. The paper considers future policy based enabled equipments and management centers based on the(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)