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Peer-to-peer live streaming is a promising way for service providers to offer high-quality IPTV to consumers at reasonable cost. The fundamental problem in peer-to-peer streaming is its capacity problem, or the maximum supported stream rate for a given network with a given peer selection constraint. This problem has been widely studied for small networks where the number of downloading peers is unlimited...
Although the use of workflow techniques based on Web services (WS) has grown rapidly for the past several years, there is still a significant gap to be bridged before such an approach is widely accepted as the standard way to build and represent WS-based applications. One of the reasons for this is the inability in most current workflow languages to support large and complex applications that require...
We use a novel multitree/mesh design to utilize the locality properties of network. The multitree-based mesh over a structured P2P overlay reduces the long delay of P2P Internet video broadcast system. Through analysis and simulation, we show that the partnership management and scheduling algorithm of MTreeTV has short delay (<9s) and high playback continuity (>98%). We also explore how the...
File consistency maintenance in P2P systems is a technique for maintaining consistency between files and their replicas. Most traditional consistency maintenance methods depend on either message spreading or structure for update propagation by pushing. Message spreading generates high overhead due to redundant messages, and cannot guarantee that every replica node receives an update. Structure-based...
Live peer-to-peer streaming has became a powerful and flexible method for multimedia content delivering. The media content transmission scheme which is responsible for availability information exchanging and data assignment is the key service for media streaming. A differential media delivering strategy proposed in this paper adopts an optimal buffer management and redundant data receiving scheme...
The paradigm of network applications is changed from traditional client/server approach to peer-to-peer (P2P) approach. One typical concepts of P2P system provides the resource sharing, and expands the flexibility to distribute resource accesses reducing the centralized server accesses. This flexibility of P2P system easily expands to be utilized the file distribution system of Web server. Current...
Multicast has been intensively studied over the past decade. Existing multicast services come in two flavors, IP multicast and application level multicast, depending on which layer the service is implemented on. After investigating the pros and cons of both approaches, as well as the characteristics of interactive distance learning, we find it an imperative to combine these two multicast approaches...
The IEEE 802.15.4 and ZigBee protocol stack offers great potentials for ubiquitous and pervasive computing, namely for wireless sensor networks. However, there are still some open and ambiguous issues that turn its practical use a challenging task. One of those issues is the study of low power consumption of sensor device, which is the biggest issue in sensor network, still has many unresolved issues...
Peer-to-peer (P2P) video conference systems receive more attention recently due to their distinct advantages over traditional server-based systems. Security is of primary concern for these systems when running over the public network. To secure the privacy of meetings an appropriate security architecture is required. The security policy management is one of the central components in such architecture...
Scalable data management is essential to share real-time sensor data in a worldwide sensor web. A peer-to-peer (P2P) network is suitable for it because of its scalability, flexibility, and robustness. When we share sensor data from the physical world in a global P2P network, overhead in data updates may be very large because sensor data frequently change in general. However, traditional works in P2P...
This paper presents VoRaQue, a software layer supporting range queries on Voronoi P2P overlays. VoRaQue maps data in a 2-dimensional space. The P2P overlay is defined by links connecting nodes that are close in the 2-dimensional space and by a set of long-range links which guarantee a poly-logarithmic routing. When a query is submitted, VoRaQue finds out a node belonging to the region defined by the...
Structured P2P networks are vulnerable to the sybil attack. In this attack, a misbehaving person generates a huge number of node identifiers and possibly chooses some of them in order to disrupt availability or integrity in the P2P network. In order to circumvent this attack, one person should be able to obtain only a limited set of identifiers and should not be able to choose them. Moreover, due...
We propose an overlay consisting of multiple trees with moderate outdegree to reduce end-to-end transmission delays in P2P media streaming systems. In real-time media streaming, lower end-to-end delays lead to less waiting time before playback and hence improve interactivity. A theoretical analysis of degree-bounded trees reveals that an optimal number of multiple trees can be chosen by considering...
Todaypsilas P2P media streaming application periodically suffers from routing hotspots, a.k.a., flash crowds. A routing hotspot is typically created by an unanticipated new event that triggers an unanticipated surge of users that request streaming service from some particular peers, temporarily overwhelming the peerpsilas delivery capabilities. In this paper, we consider how to discover the routing...
Peer-to-peer (P2P) media streaming quickly emerges as an important application over the Internet. A plethora of approaches have been suggested and implemented to support P2P media streaming. In our study, we first classified existing approaches and studied their characteristics by looking at three important quantities: number of upstream peers (parents), number of downstream peers (children) and average...
k-mutual exclusion is an important problem for resource-intensive peer-to-peer applications ranging from aggregation to file downloads. In order to be practically useful, k-mutual exclusion algorithms not only need to be safe and live, but they also need to be fair across hosts. We propose a new solution to the k-mutual exclusion problem that provides a notion of time-based fairness. Specifically,...
Previous works in P2P streaming provide many kinds of solutions to construct an effective streaming overlay, they either lack of flexibility or can not gain global optimal performance. A new synchronization based approach proposed in this paper use a fully distributed scheme to achieve optimal peer selection and dynamic peer management. Especially, the working set discrepancy between peers is taken...
In order to improve scalability and reduce maintenance overhead for structured peer-to-peer systems, researchers design optimal architectures with constant degree and logarithmical diameter. The expected topologies, however, require the number of peers to be some given values determined by the average degree and the diameter. Hence, existing designs fail to address the issue due to the fact that (1)...
We introduce COSTA, for content-based search using term aggregation. Besides advantages shared with other P2P-based information retrieval systems, the system has several characteristics that distinguish itself from other systems: First, an adaptive indexing scheme which can dynamically identify important terms is used. Important terms are indexed in a chord-like ring, while other terms are aggregated...
Active XML (AXML) systems provide an elegant platform to integrate the power of XML, Web services and Peer to Peer (P2P) paradigms by allowing (active) Web service calls to be embedded within XML documents. In this work, we focus on the replication aspect of AXML systems, and study the effect of peer disconnection (an inherent trait of P2P systems) on replication. To be more precise, given peer disconnection...
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