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The efficiency of BitTorrent in content distribution has inspired a number of peer-to-peer (P2P) protocols for on-demand video (VoD) streaming systems (henceforth BitTorrent-like VoD systems). However, the fundamental quality-of-service (QoS) requirements of VoD (i.e. providing peers with a smooth playback continuity and a short startup delay) make the design of these systems more challenging than...
The key to Web Service discovery is how to quickly locate target services among numerous registries, and exactly describe services so as to match between service requests and advertisements. Currently Web Service systems, which publish WSDL-described Web Services in UDDI, cannot support automatic Web Service publication, discovery and execution. UDDI has become the bottleneck of the whole system and...
Overlay networks based on the P2P paradigm have been successfully employed to facilitate reliable data transport. They are used to improve the dependability of traffic flows between end-hosts without changing the underlying infrastructure. By observing connections between neighbours, the overlay can predict the statistical behaviour of the network and can thus select proper routes. In particular,...
One of the challenges for the P2P-based service composition process is how to effectively discover and select the most appropriate peers to execute the service applications when considering multiple properties of the requested services. Different ontology-based e-service profiles have been proposed to facilitate handling multiple properties and to enhance the service oriented process in order to achieve...
While virtual networks have been subjected to detailed analysis, prototypes are usually constructed and instantiated manually or by means of control protocols that mostly neglect security considerations. In this work, we present our proposal for a Virtual Link Setup Protocol (VLSP) that is designed as a modular extension to a standardized and extensible state-of-the-art signaling protocol suite. We...
Delivery of high-quality streaming services over multi-hop wireless mesh networks (WMNs) is a challenging research problem because of quality fluctuation and interference of wireless links in WMNs, as well as strict throughput, delay, and reliability requirements of streaming applications. In this paper, we propose a Network Assisted Peer-to-Peer (NAP2P) system for file-based media streaming services...
Advancements in technology over the past decade are leading to a promising future for large-scale distributed systems, where globally-scattered distributed resources are collectively pooled and used in a cooperative manner to achieve unprecedented petascale supercomputing capabilities. The issues of resource management (resMgt) and reputation management (repMgt) need to be addressed in order to ensure...
Peer-to-peer networks (P2Ps) use reputation systems to provide incentives for nodes to offer high quality of service (QoS) and thwart the intentions of dishonest or selfish nodes. Existing reputation systems have two problems. First, they directly regard node reputation as trust. Reputation represents the opinion formed by others about a node's QoS behavior, while trust represents a node's honesty...
Recent works have shown how Multiple Description Coding (MDC) and Peer-to-Peer transmission protocols prove to be extremely helpful in streaming video sequences. The quality of the reconstructed sequence can be significantly improved by differentiating the Quality-of-Service levels via distributed packet classifications performed by each peer independently. The packet labelling can be modelled via...
Supporting Quality-of-Service resource reservations for IP multicast flows is especially advantageous for distributed multimedia applications like video conferencing, 3D tele-immersion, or multi-player online gaming. In response to various limitations of RSVP the IETF developed more flexible signaling protocols within the Next Steps in Signaling (NSIS) framework. But unlike RSVP, the NSIS protocols...
Research and industries are recently more interesting and attracting to the Vehicular Ad hoc Networks (VANETs) development domain. They contribute to safer and more efficient roads by providing timely and accuracy information to drivers and authorities. Thus, the definition of a quality of service routing protocol for VANETs is one of their challenges. In this paper, we propose QoSBeeVanet, a new...
Aiming at improving the QoS performance over fading channels, this paper presents an analysis of the effective capacity for a relay-assisted communication system which utilizes a cooperative packet retransmission protocol at the link-layer in conjunction with AMC-based multi-rate transmission at the physical layer. In the considered model, a source (S) node employs AMC to transmit delay-constrained...
Anypath routing, a new routing paradigm, has been proposed to improve the performance of wireless networks by exploiting the spatial diversity and broadcast nature of the wireless medium. In this paper, we study the problem of finding an anypath subject to multiple (K) constraints, which has been proved to be NP-hard. We present a polynomial distributed K-approximation routing algorithm. Our algorithm...
One of the most important problems in the field of performance optimization for data networks is the problem of routing to achieve delay minimization. This becomes extremely important in the context of providing Quality of Service while satisfying demand. The problem is classical and was considered three decades ago by a number of authors primarily Gallagher, Bertsekas and Garcia-Luna-Aceves. The...
Due to integrated high-speed networks accommodating various types of services and applications, the quality of service (QoS) requirements for those networks have also become diverse. The network resources are shared by the individual service traffic in the integrated network. Thus, the QoS of all the services may be degraded indiscriminately when the network becomes congested due to a sudden increase...
In NCS (networked control systems), the control performance depends on not only the control algorithm but also the communication protocol stack. This paper presents a framework for the protocol reconfiguration in NCSs. Task queuing, network transmission policy and communication link control are emphasized as three key protocol functionalities related to the system performance. Based on it, data and...
Network virtualization has been recognized as a promising solution to enable the rapid deployment of customized services by building multiple Virtual Networks (VNs) on a shared substrate network. Whereas various VN embedding schemes have been proposed to allocate the substrate resources to each VN requests, little work has been done to provide backup mechanisms in case of substrate network failures...
The number of educational resources in universities has been growing explosively during the past few years, on the other hand, although e-learning system could provide learning service access for learners, some learners couldn't access the educational resources conveniently. At the same time, the current e-learning system couldn't solve e-learning resource sharing system of interoperability, and can't...
To provide live streaming service to mobile users, traditionally each user pulls content from a server over his cellular network. In order to overcome the scalability problem of last-hop bandwidth bottleneck, mobile peer-to-peer (P2P) streaming can be used where mobile devices relay their stream received in a multi-hop manner by means of a secondary channel (such as Wi-Fi or bluetooth). We investigate...
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