9,184 research outputs found
Congratulations to Ian Stedman on receiving the IP Osgoode David Vaver Medal for Excellence in IP!
No full textIP Osgoode is pleased to announce the award of the IP Osgoode David Vaver Medal for Excellence in IP to Ian Stedman, PhD
A survey of requirements and standardization efforts for IP-telephony-security
No full textSecurity as a dimension of trustworthiness in IP-Telephony systems and protocols is a main condition for the commercial success of IP-Telephony. In this work, we present a survey of security requirements and show how various standardization efforts address these requirements. We describe the basic tasks and elements of IP-Telephony systems and compare them to Telephony via PSTNs to derive some possible attacks for example. We classify the security preconditions to achieve trustworthiness of users and providers in this systems. We list weighty criteria for further evaluation of security mechanisms which can fulfil these requirements. After this, we describe the integration of security mechanisms in current IP-Telephony protocols and figure out work areas which have to be solved in future
Support For IP Mobility and Diversity in a Broadband Wireless Access Network
No full textBroadband wireless access (BWA) network working at millimetre bands possesses the advantages of quick deployment, more flexibility, wide service coverage and cost efficiency. The range of services to be provided via the system includes broadband digital television, Internet data, telephony and videoconference. Apart from broadcast digital television, all traffic is carried in Internetworking Protocol (IP) format.
Unfortunately the services of such a system are susceptible to impairment by buildings, vegetation, terrain and attenuation caused by rain, snow and sleet, etc. Accordingly the service availability and system performance can drop dramatically. In the worst case, the system will experience heavy packet loss and the services might be completely unavailable.
An extended multiprotocol label switching (MPLS) network architecture is proposed in this thesis, which allows fast mobile IP access and diversity routing for traffic under fade condition. This supports nomadic access, reduced packet loss and improved service availability in BWA network during system outage. Also developed herein is a Diversity and Shadow Flow Merging Mechanism, which, besides sending a packet on its normal path, also duplicates the packet and sends it on a separate, diverted labelled path. The shadow flow merging mechanism is responsible for merging the normal flow and shadow flow together and delivering the merged packet to its destination. It is anticipated that the packet can be successfully delivered to the destination even if one path fails completely during the system outage.
The protocol is tested on a general BWA network that is configured with Digital Video Broadcast (DVB) downlink and Multi-Frequency Time Division Multiplex Access (MF-TDMA) uplink equipments. The protocol’s ability of reducing packet loss and improving service availability, during the period of link failure, is verified. It is concluded that the protocol is effective in improving the service availability of BWA network
Qualidade de serviço em aplicações multimídia sobre redes IP/ATM
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.Esta dissertação analisa os fatores relevantes para o suporte a QoS para aplicações multimídia distribuídas, além de alguns protocolos e sistemas disponíveis atualmente que provêm QoS. Qualidade de Serviço (QoS) é uma especificação qualitativa e quantitativa dos requisitos de uma aplicação que um sistema multimídia deve satisfazer a fim de obter a qualidade desejada. QoS é um requisito fundamental para diversas aplicações, envolve atividades como especificação,mapeamento, negociação e gerenciamento de recursos. As redes ATM fornecem a QoS, mas quando são utilizadas aplicações IP sobre ATM esta característica é perdida. O objetivo da dissertação foi estudar o problema de provimento de QoS em aplicações multimídia em redes locais IP sobre ATM e propor uma extensão no CLIP a fim de prover QoS às aplicações IP
IMS: The New Generation of Internet-Protocol-Based Multimedia Services
No full textLegacy networks, both fixed and mobile, which were originally designed for voice communications, are progressively migrating to new infrastructures that promise to revolutionize the services offered. In this paper, we will cover this new generation of personal communication services, with an emphasis on the family of Internet protocol (IP)-based multimedia subsystem (IMS)-aided infrastructure that relies on the session initiation protocol (SIP). As a benefit, the end users will enjoy a new generation of personal communications services that are accessible anywhere and anytime. These services are timedia subsystem (IMS)-aided infrastructure that relies on the directly related to the end users rather than to their diverse devices. It is anticipated that the new deployments of next-of the IMS technology. generation networks (all-IP based) will accelerate the adoptio
Perceptions of intellectual property: a review
No full textIn “The right to good ideas: patents and the poor”, The Economist depicts two driving forces in the contemporary discourse on IP and globalization. The one is interested in advancing the knowledge economy, an approach based on the belief that knowledge is the driving factor behind economic growth. The other resides on a belief that IP is a major means to advance the process of globalization. While the former is strongly motivated by new economic growth theory, as for example advanced by Stanford professor Paul Romer, the latter is based on typical anti-globalization arguments, such as for example the position that the IP system helps multinational companies to build up monopolies to the detriment of the poor, drives small and medium-sized enterprises (SMEs) and local business in developing countries out of business and increases prices for consumer products, be they pharmaceuticals or software. The purpose of this review is to help understand the current discourse on intellectual property, to grasp underlying themes, assumptions and connotations associated with the term “IP”, so as to identify paths leading to a more comprehensive understanding of IP and the opportunities and pitfalls it may provide
Efficient Learning of Communication Profiles from IP Flow Records
No full textThe task of network traffic monitoring has evolved drastically with the ever-increasing amount of data flowing in large scale networks. The automated analysis of this tremendous source of information often comes with using simpler models on aggregated data (e.g. IP flow records) due to time and space constraints. A step towards utilizing IP flow records more effectively are stream learning techniques. We propose a method to collect a limited yet relevant amount of data in order to learn a class of complex models, finite state machines, in real-time. These machines are used as communication profiles to fingerprint, identify or classify hosts and services and offer high detection rates while requiring less training data and thus being faster to compute than simple models.Accepted author manuscriptCyber Securit
Data communication
No full textThe aim of this report is to explain the limitations inherent in communications across a communicational telephone link, and also to explore the concept of layering for the internet and TCP/IP protocols. The objective of this report is to browse the problems that hamper data transmission over a Public Switch Telephone Network (PSTN) and to see how these dilemmas are defeated. Also, this report explains the layers involved in internet communication, specifically the TCP/IP.
This report begins with an introduction to the need for communications. Subsequently, the report demonstrates the telephone and at the outset, the use of it, and how it has changed progressively to follow the demands of modern communication. The end of the report explains the need for the layer model, especially the TCP/IP and how it was generated from a previous network model, the OSI layers scheme. This report shows the rapid changes and the dilemmas that are facing present day communications. The information that is used for the report subject headings was all derived from different resources, such as books, websites, and journal articles
Intellectual Property for Economic Development: Issues and Policy Implications
No full textCollection of articles from a conference at the Korean Development Institute on IP and economic developmen
Solução de telefonia IP em uma rede corporativa
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação
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