1,732 research outputs found
MULTIMEDIA ON GEOGRAPHIC NETWORK
In this thesis we investigate the topic of the multimedia contents distribution on a geo-
graphic network which is a rarefied and huge field. First of all we have to classify the main
parts necessary in the multimedia distribution on a geographic network. The main aspects
of a geographic network that will be highlighted in this thesis are: the mechanism used to
retrieve the sources of the multimedia content; in the case of the peer-to-peer network on
geographic network one of the most important mechanism is the query flooding protocol.
The kind of overlay network (peer-to-peer) used to distribute the multimedia content. The
usage of this overlay network in a multicast network. The security of the overlay network
over a geographic network.
Therefore the first topic which is investigated in this thesis is the query flooding protocol
that can be used in any kind of query operation on a peer-to-peer network. For this protocol
we achieve an analytical model through a complex analysis of the proxies network. In this
analysis we can see how the proxies permit an improvement in the performance with respect
to the routing operations in a generic network of routers. Moreover we address a simple
formulation and framework about the performance of the network with and without layer
7 (proxy) and we apply them in three different types of scenarios to show the advantages
achieved with the usage of proxies instead of routers.
Through the query flooding operation, each peer of the peer-to-peer network can achieve
the list of the peers that hold the desired multimedia content. In a multimedia content dis-
tribution system, after the previous step in which the list of the peers that hold the desired multimedia content is retrieved, it is necessary to establish the kind of peer-to-peer network
used to distribute this multimedia content to the peers that require it. Therefore the second
aspect analysed in this thesis, is how the peer-to-peer network is built so that it is possible to
provide the multimedia content to the vast majority of peers (that require this content) with
the minimum delay. The construction of the peer-to-peer networks used for the distribution
of the multimedia contents is not a very investigated field. Thus in this thesis we produce
new algorithms used to build peer-to-peer networks in an incremental way on asymmetric
and radio channel and we establish which algorithm is better with respect to the maximum
delay of the network, the maximization of the number of peers accepted in the network and
the minimization of the bit error probability of each peer of the peer-to-peer network.
In this thesis, we propose an usage of the overlay network (peer-to-peer network) in
a multicast network. We introduce an innovative mechanism that exploits the peer-to-peer
network to make reliable a standard unreliable multicast network. Moreover we present an
analytical model for this innovative mechanism.
Finally the last aspect of a geographic network is the security of the communications
among a group of peers. Thus to ensure the maximum level of security with secure commu-
nications among a group of three or more peers, in this thesis we propose a new protocol,
based on the Massey Omura protocol, which can allow the communications among the
peers of a peer-to-peer network in a secure way. Moreover we present the security prob-
lems of this Massey Omura Multiple Users Protocol and how it is possible to avoid these
issues through a specific encryption function and a specific decryption function by chang-
ing the encryption and decryption keys of each peer when the source peer changes. Finally
we present a new cryptography protocol which we use to share the decryption shared key
that is used in the Massey Omura Multiple Users Protocol
Recommended from our members
Multimedia delivery in the future internet
The term “Networked Media” implies that all kinds of media including text, image, 3D graphics, audio
and video are produced, distributed, shared, managed and consumed on-line through various networks,
like the Internet, Fiber, WiFi, WiMAX, GPRS, 3G and so on, in a convergent manner [1]. This white
paper is the contribution of the Media Delivery Platform (MDP) cluster and aims to cover the Networked
challenges of the Networked Media in the transition to the Future of the Internet.
Internet has evolved and changed the way we work and live. End users of the Internet have been confronted
with a bewildering range of media, services and applications and of technological innovations concerning
media formats, wireless networks, terminal types and capabilities. And there is little evidence that the pace
of this innovation is slowing. Today, over one billion of users access the Internet on regular basis, more
than 100 million users have downloaded at least one (multi)media file and over 47 millions of them do so
regularly, searching in more than 160 Exabytes1 of content. In the near future these numbers are expected
to exponentially rise. It is expected that the Internet content will be increased by at least a factor of 6, rising
to more than 990 Exabytes before 2012, fuelled mainly by the users themselves. Moreover, it is envisaged
that in a near- to mid-term future, the Internet will provide the means to share and distribute (new)
multimedia content and services with superior quality and striking flexibility, in a trusted and personalized
way, improving citizens’ quality of life, working conditions, edutainment and safety.
In this evolving environment, new transport protocols, new multimedia encoding schemes, cross-layer inthe
network adaptation, machine-to-machine communication (including RFIDs), rich 3D content as well as
community networks and the use of peer-to-peer (P2P) overlays are expected to generate new models of
interaction and cooperation, and be able to support enhanced perceived quality-of-experience (PQoE) and
innovative applications “on the move”, like virtual collaboration environments, personalised services/
media, virtual sport groups, on-line gaming, edutainment. In this context, the interaction with content
combined with interactive/multimedia search capabilities across distributed repositories, opportunistic P2P
networks and the dynamic adaptation to the characteristics of diverse mobile terminals are expected to
contribute towards such a vision.
Based on work that has taken place in a number of EC co-funded projects, in Framework Program 6 (FP6)
and Framework Program 7 (FP7), a group of experts and technology visionaries have voluntarily
contributed in this white paper aiming to describe the status, the state-of-the art, the challenges and the way
ahead in the area of Content Aware media delivery platforms
SCOPE: Synergistic Content Distribution and Peer-to-Peer Networks
Distributing content on the Internet is an important economic, educational, social, and cultural endeavor. To this end, several existing efforts use traditional server-based content distribution networks (CDNs) to replicate and distribute Web and multimedia content of big content producers, such as news Web sites, or big businesses, such as online shopping websites, etc., to millions of Internet users. This approach places a large number of content servers at strategic locations on the Internet, incurring a very large deployment and operating cost. Therefore, it is available only to some wealthy companies/organizations. Individual users and small content publishers may rely on a more economical content dissemination approach based on recent peer-to-peer technology to distribute their own content. Nevertheless, it is the ephemeral and the limited resources nature of peer-to-peer networks that hinder a wide spread adoption of peer-to-peer technology as a reliable content distribution solution. It is, therefore, important that a new generation of cost-effective and reliable content distribution framework be proposed and investigated. Building on the successes and failures of previous content distribution approaches, the proposed research goal is to find and evaluate a Synergistic Content Distribution and Peer-to-Peer Networks (SCOPE). SCOPE leverages the reliability and the resourcefulness of traditional server-based CDNs while tapping on the economical and dynamic resources of peers
Multiple-Tree Push-based Overlay Streaming
Multiple-Tree Overlay Streaming has attracted a great amount of attention
from researchers in the past years. Multiple-tree streaming is a promising
alternative to single-tree streaming in terms of node dynamics and load
balancing, among others, which in turn addresses the perceived video quality by
the streaming user on node dynamics or when heterogeneous nodes join the
network. This article presents a comprehensive survey of the different
aproaches and techniques used in this research area. In this paper we identify
node-disjointness as the property most approaches aim to achieve. We also
present an alternative technique which does not try to achieve this but does
local optimizations aiming global optimizations. Thus, we identify this
property as not being absolute necessary for creating robust and heterogeneous
multi-tree overlays. We identify two main design goals: robustness and support
for heterogeneity, and classify existing approaches into these categories as
their main focus
Towards QoE-Driven Optimization of Multi-Dimensional Content Streaming
Whereas adaptive video streaming for 2D video is well established and frequently used in streaming services, adaptation for emerging higher-dimensional content, such as point clouds, is still a research issue. Moreover, how to optimize resource usage in streaming services that support multiple content types of different dimensions and levels of interactivity has so far not been sufficiently studied. Learning-based approaches aim to optimize the streaming experience according to user needs. They predict quality metrics and try to find system parameters maximizing them given the current network conditions. With this paper, we show how to approach content and network adaption driven by Quality of Experience (QoE) for multi-dimensional content. We describe components required to create a system adapting multiple streams of different content types simultaneously, identify research gaps and propose potential next steps
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