661 research outputs found
Design of a shared whiteboard component for multimedia conferencing
This paper reports on the development of a framework for multimedia applications in the domain of tele-education. The paper focuses on the protocol design of a specific component of the framework, namely a shared whiteboard application. The relationship of this component with other components of the framework is also discussed. A salient feature of the framework is that it uses an advanced ATM-based network service. The design of the shared whiteboard component is considered representative for the design as a whole, and is used to illustrate how a flexible protocol architecture utilizing innovative network functions and satisfying demanding user requirements can be developed
Towards a Framework for Modelling Multimedia Conferencing Calls in the Next Generation Network
This paper is concerned with the creation of a multiparty multimedia conferencing application which can be used in Next Generation Networks. It begins by suggesting ways in which conferencing can be modeled with a focus on separating signaling and media transfer functionality. Enabling technologies which could support the modeling framework derived and which are compatible with Next Generation Network (NGN) principles are reviewed. Finally, a design and implementation for a simple multimedia conferencing application are described
A Cloud Platform-as-a-Service for Multimedia Conferencing Service Provisioning
Multimedia conferencing is the real-time exchange of multimedia content
between multiple parties. It is the basis of a wide range of applications
(e.g., multimedia multiplayer game). Cloud-based provisioning of the
conferencing services on which these applications rely will bring benefits,
such as easy service provisioning and elastic scalability. However, it remains
a big challenge. This paper proposes a PaaS for conferencing service
provisioning. The proposed PaaS is based on a business model from the state of
the art. It relies on conferencing IaaSs that, instead of VMs, offer
conferencing substrates (e.g., dial-in signaling, video mixer and audio mixer).
The PaaS enables composition of new conferences from substrates on the fly.
This has been prototyped in this paper and, in order to evaluate it, a
conferencing IaaS is also implemented. Performance measurements are also made.Comment: 6 pages, 6 figures, IEEE ISCC 201
Options for Securing RTP Sessions
The Real-time Transport Protocol (RTP) is used in a large number of
different application domains and environments. This heterogeneity
implies that different security mechanisms are needed to provide
services such as confidentiality, integrity, and source
authentication of RTP and RTP Control Protocol (RTCP) packets
suitable for the various environments. The range of solutions makes
it difficult for RTP-based application developers to pick the most
suitable mechanism. This document provides an overview of a number
of security solutions for RTP and gives guidance for developers on
how to choose the appropriate security mechanism
Flexible media transport framework based on service composition for future network
This work introduces common guidelines defined in several standardization organisms towards future networks based on the actual mechanisms and protocols used to treat the
multimedia data, most of them placed in the application layer of the OSI reference model.Peer ReviewedPreprin
Signaling For Multimedia Conferencing in Stand-Alone Mobile Ad Hoc Networks
Mobile ad hoc networks (MANETs) are infrastructure-less and can be set up anywhere, anytime. They can host a wide range of applications in rescue operations, military, private, and commercial settings. Multimedia conferencing is the basis of a wealth of “killer†applications that can be deployed in MANETs. Some examples are audio/video conferencing, multiplayer games, and online public debating. Signaling is the nerve center of multimedia conferences—it establishes, modifies, and tears down conferences. This paper focuses on signaling for multimedia conferences in MANETs. We review the state of the art and propose a novel architecture based on application-level clusters. Our validation employed SIP as the implementation technology and OPNET as our simulation tool. Our clusters are constructed dynamically and the nodes that act as cluster heads are elected based on their capabilities. The capabilities are published and discovered using a simple application-level protocol. The architectural principles and the clustering operations are discussed. Our SIP-based implementation is also presented along with the performance evaluation. Keywords: MANET, SIP-technology, OPNET-simulation tool, cluste
Meta-Generalization for Multiparty Privacy Learning to Identify Anomaly Multimedia Traffic in Graynet
Identifying anomaly multimedia traffic in cyberspace is a big challenge in
distributed service systems, multiple generation networks and future internet
of everything. This letter explores meta-generalization for a multiparty
privacy learning model in graynet to improve the performance of anomaly
multimedia traffic identification. The multiparty privacy learning model in
graynet is a globally shared model that is partitioned, distributed and trained
by exchanging multiparty parameters updates with preserving private data. The
meta-generalization refers to discovering the inherent attributes of a learning
model to reduce its generalization error. In experiments, three
meta-generalization principles are tested as follows. The generalization error
of the multiparty privacy learning model in graynet is reduced by changing the
dimension of byte-level imbedding. Following that, the error is reduced by
adapting the depth for extracting packet-level features. Finally, the error is
reduced by adjusting the size of support set for preprocessing traffic-level
data. Experimental results demonstrate that the proposal outperforms the
state-of-the-art learning models for identifying anomaly multimedia traffic.Comment: Correct some typo
Inter-domain interoperability framework based on WebRTC
Nowadays, the communications paradigm is changing with the convergence of communication
services to a model based on IP networks. Applications such as messaging or voice over IP are
increasing its popularity and Communication Service Providers are focusing on offering this kind
of services.
Moreover, Web Real Time Communication (WebRTC) has emerged as a technology that
eases the creation of web applications featuring Real-Time Communications over IP networks
without the need to develop and install any plug-in. It lacks of specifications in the control plane,
leaving the possibility to use WebRTC over tailored web signalling solutions or legacy networks
such as IP Multimedia Subsystem (IMS). This technology brings a wide range of possibilities for
web developers, but Communication Service Providers are adviced to develop solutions based
on the WebRTC technology as described in the Eurescom Study P2252.
The lack of WebRTC specifications on the signalling platform together with the threats
and opportunities that this technology represents for Communication Service Providers, makes
evident the need of research on interoperability solutions for the different kind of signalling implementations
and experimentation on the best way for Communication Service Providers to
obtain the maximum benefit from WebRTC technology.
The main goal of this thesis is precisely to develop a WebRTC interoperability framework
and perform experiments on whether the Communication Service Providers should use their
existing IMS solutions or develop tailored web signalling platforms for WebRTC deployments.
In particular, the work developed in this thesis was completed under the framework of the
Webrtc interOperability tested in coNtradictive DEployment scenaRios (WONDER) experimentation
for the OpenLab project. OpenLab is a Large-scale integrating project (IP) and is part of
the European Union Framework Programme 7 for Research and Development (FP7) addressing
the work programme topic Future Internet Research and Experimentation.Actualmente, el paradigma de comunicaciones está cambiando gracias a la convergencia de los
servicios de comunicaciones hacia un modelo basado en redes IP. Aplicaciones tales como la
mensajería y la voz sobre IP están creciendo en popularidad mientras los proveedores de servicios
de comunicaciones se centran en ofrecer este tipo de servicios basados en redes IP.
Por otra parte, la tecnología WebRTC ha surgido para facilitar la creación de aplicaciones
web que incluyan comunicaciones en tiempo real sobre redes IP sin la necesidad de desarrollar o
instalar ningún complemento. Esta tecnología no especifica los protocolos o sistemas a utilizar
en el plano de control, dejando a los desarrolladores la posibilidad de usar WebRTC sobre soluciones
de señalizaci on web específicas o utilizar las redes de señalización existentes, tales como
IMS. WebRTC abre un gran abanico de posibilidades a los desarrolladores web, aunque también se recomienda a los proveedores de servicios de comunicaciones que desarrollen soluciones
basadas en WebRTC como se describe en el estudio P2252 de Eurescom.
La falta de especificaciones en el plano de señalización junto a las oportunidades y amenazas
que WebRTC representa para los proveedores de servicios de comunicaciones, hacen evidente la
necesidad de investigar soluciones de interoperabilidad para las distintas implementaciones de
las plataformas de señalización y de experimentar c omo los proveedores de servicios de comunicaciones
pueden obtener el máximo provecho de la tecnología WebRTC.
El objetivo principal de este Proyecto Fin de Carrera es desarrollar un marco de interoperabilidad
para WebRTC y realizar experimentos que permitan determinar bajo que condiciones
los proveedores de servicios de comunicaciones deben utilizar las plataformas de se~nalizaci on
existentes (en este caso IMS) o desarrollar plataformas de señalización a medida basadas en
tecnologías web para sus despliegues de WebRTC.
En particular, el trabajo realizado en este Proyecto Fin de Carrera se llevó a cabo bajo
el marco del proyecto WONDER para el programa OpenLab. OpenLab es un proyecto de
integración a gran escala en el cual se desarrollan investigaciones y experimentos en el ámbito
del futuro Internet y que forma parte del programa FP7 de la Unión Europea.Ingeniería de Telecomunicació
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