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Rateless codes allow a user to incrementally send additional redundancy, so they can be useful for heterogeneous and time-varying networks for which the choice of redundancy level in advance is difficult. Rateless codes are an attractive application layer forward error correction solution due to their flexibility and capacity-approaching performance. The original rateless codes were developed for...
Most of the multimedia applications use the User Datagram Protocol (UDP) as a transport layer protocol because it is suitable for the delivery of multimedia data over the Internet. However, the use of UDP could endanger the stability of the network because there is no congestion control applied. To a certain extent, the network can collapse if too many applications deliberately use this protocol....
Replicas of multimedia objects are distributed to peers in overlay networks. Multimedia objects are characterized in terms of not only data structure parameter but also quality of service (QoS) parameters like frame rate. Replicas have to be synchronized to be mutually consistent. Each parameter of a replica is read and written by transactions. Thus, the data structure and QoS parameters of a replica...
The Internet Protocol Multimedia Subsystem (IMS) has been recognized as a common signaling architecture for providing next generation multimedia services. In order to enhance perceived service quality regardless of access network and device, IMS supports Quality of Service (QoS) negotiation and signaling. The IMS procedures used for that purpose are based on Session Initiation Protocol (SIP). Therefore,...
With the ongoing convergence of telecommunication networks towards an all IP architecture, service providers are challenged by the need of continuously renewing their offer of value-added multimedia services. In this paper, we propose an abstraction layer to be used in application servers, based on the concepts proposed in the so called Java Call Control (JCC) specifications. It simplifies the creation...
Traditional transport layer protocols have been designed to perform end-to-end error control transparently to the intermediate nodes (e.g., TCP). However, the resource constraints featured by Wireless Sensor Network (WSN) require a different paradigm where intermediate nodes are able to cache packets and if possible retransmit them on-demand to avoid incurring costly end-to-end retransmissions. Lately,...
Even when IMS is the most popular platform for multimedia services, the open versions of IMS ecosystem are lacking in specified functionalities for IPTVv6 and VoIPv6 services. In this paper, we extend current client and server open source software in order to provide reliability and security to these multimedia services. As a part of our work the IMS architecture for conferencing system with proposed...
Broadband services are changing our life. The applications of a variety of new services are also a profit growth point for operators. The evolution of the transmission quality for service has gradually attracted the operator's attention. In this paper, we classify the services of application from user's perspective, then describe and analyze service broadband in communication system in detail. Secondly,...
In this paper, we propose three IMS Architectures for evaluation QoE of the IPTV service considering Subjective Measurement; in this case, we added QoE AS, which applies in a periodical time a survey to collect the QoE value, Objective Measurement; in this architecture, we propose collected information about the QoS from the IMS Policy and Charging Control entity, then, We could calculate the QoE...
in shared-memory Chip Multiprocessor (CMP), shared data between different cores must be exchanged through the last-level-shared-cache and cache coherence must be maintained at the same time. As the number of cores increase, the cache coherence wall has become more and more serious. As for the multimedia applications full of streaming-like data, existing multicore cache coherence protocols show lower...
Internet traffic volume has been increasing rapidly due to popularization of various multimedia services such as P2P, streaming and online games other than simple Web browsing. In addition, management of increased Internet traffic is regarded as important to provide stable services guaranteeing QoS (Quality of Service) and security. In particular, for the HTTP traffic, its amount used is also on the...
Replicas of multimedia objects are distributed to peers in overlay networks. In quorum-based (QB) protocols, every replica may not be up-to-date and the up-to-date replica can be found in the version counter. Multimedia objects are characterized in terms of not only data structure but also quality of service (QoS) parameters like frame rate. Each parameter of a replica is read while there is a read...
Web-based applications offer a range of the benefits over traditional desktop applications; they are good for wide accessibility, platform independence, rich user experience, dynamic content, high scalability easy-to-share, and easy-to-use. This paper proposes a web-based framework of multimedia support for collaborative editing. A transmission protocol that integrates OT with the consideration of...
Multimedia sensor network (MSN) has been deployed in many fields owing to its reliability, flexibility and availability of multimedia data. Correspondingly more challenges draw into the QoS guarantee research. In this paper, we establish a comprehensive performance analytical framework for MSN considering both the traffic self-similarity and stochastic service curve of MSN with S-MAC protocol based...
Networked mixed reality applications typically consist of several kinds of media objects, e.g. live video streams of real objects combined with 3D animations, download, chat and haptic interaction control. Even though it seems obvious that these applications are likely to profit from concepts as Quality of Service (QoS) or path diversity, there often seems to be a kind of gap between the world of...
The widespread use of SIP has exposed a lot of vulnerabilities in this protocol. Among them, overload can cause serious problems for SIP servers. SIP overload occurs when a SIP server does not have enough resources to process messages. In this paper, we proposed effective methods to control SIP server overload based on the Window-Based overload control method, considering not only the maximum window...
Replicas of multimedia objects are distributed to peers through downloading and caching in peer-to-peer(P2P) overlay networks. Every replica has to be consistent. In quorum-based (QB) protocols, every replica may not be up-to-date and the up-to-date replicas can be found in the version counters. On the other hand, multimedia objects are characterized in terms of not only data structure parameter but...
Multimedia applications are gaining popularity over smart devices. Sharing and using multimedia contents among multiple devices is a hot issue in N-screen environment. In this paper, we are going to investigate how the same stream can be shared by distinct bit rates devices and how several streams can be managed to different devices. We propose control architecture of group communication using Group...
Current Internet architecture is challenged by the overwhelming multiplication of available content and the increasing requirements of the content delivery applications. Content Delivery Networks have been playing a catalytic role in content delivery solutions, replicating (caching) content at the edges of the network. In this paper, we investigate the role and the benefits of a more flexible and...
Transmission of video and imaging data requires both energy and QoS aware routing in order to ensure efficient usage of the sensors and effective access to the gathered information. In large-scale networks with a large number of sensor nodes, multiple sink nodes should be deployed to increase the manageability of the network and also to reduce the energy dissipation at each node. In this paper we...
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