34 research outputs found

    Bandwidth renegotiation scheme for VBR video services

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    Implementation of MANET routing protocols on OMNeT++

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    This work describes how some of the most popular ad hoc routing protocols (DYMO, DSR, AODV) have been implemented for the INET library of OMNeT++ simulator tool. The developed modules have been programmed so they can be easily extensible to include future routing MANET protocols

    A Smart Phone-based Personal Area Network for Remote Monitoring of Biosignals

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    This paper presents a system whose purpose is to monitor a patient continuously from indoor or outdoor environments. The system is based on a Bluetooth PAN, carried by the patient, whose central node, a smart phone, compiles information about patient’s location and health status. These data are encrypted to be sent to a server through Wifi or GPRS/UMTS. The system provides facilities to access to patient’s data, even from a smart phone by a J2ME application. It also allows to configure remotely the threshold values used to detect emergency situations.Ministerio de Eduación y Ciencia TEC2006-12211-C02-01/TCMMinisterio de Educación y Ciencia TIC2003- 07953-C02-0

    Heavy-tailed distribution of scene duration in VBR video

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    Characterisation and modelling of VBR video traffic

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    Link-Layer Based Anycast Routing for a Dynamic and Distributed Portal Selection in Wireless Mesh Networks

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    Part 7: Wireless Multi-hop Communications Challenges in the Future InternetInternational audienceWireless mesh networks may be equipped with multiple Portals that offer access to external networks such as the Internet. These Portals are provided with two interfaces: one to a wired network (to communicate with other Portals and Gateways) and another one to the wireless network. In the current 802.11s standard, the interaction between these two interfaces is not defined. By connecting both interfaces in a seamless way, this paper addresses and solves the problem of dynamically selecting multiple Portals in a Wireless Mesh Network. In particular, the proposal is supported by the definition of an anycast group formed by the Portals in the network. Any data frame whose destination is an external host is routed to any Portal in the network. The route is selected depending on the instantaneous network conditions (e.g. path availability, number of hops, delay or losses). To make this selection a distributed process, a link-layer based forwarding scheme is employed. By means of simulations, we state that the application of the proposed technique yields to significant improvements concerning the network performance
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