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Peer-assisted content distribution technologies have been attracting attention. By using not only server resources but also the resources of end hosts (i.e., peers), we can reduce the offered load on servers as well as utilization of the access bandwidth of the servers. However, offered traffi to the network may increase because the traffi exchanged between peers passes across the network. Specificall,...
In this paper, we propose a novel P2P VoD streaming system, named PECAN where each peer adjusts its cache capacity adaptively to meet the server's upload bandwidth constraint and achieve the fairness. For doing so, we first propose a new cache replacement algorithm that designs the number of caches for a segment to be proportional to its popularity. Second, we mathematically prove that if the cache...
As compared to live peer-to-peer (P2P) streaming, modern P2P video-on-demand (VoD) systems have brought much larger volumes of videos and more interactive controls to the Internet users. Nevertheless, the larger number of available videos and the flexibility of allowing users to jump back and forth in a video, have led to much fewer numbers of concurrent peers watching at a similar pace, that reduces...
In this paper we study the content retrieval delay in a hybrid content distribution system, e.g., emerging content clouds [1], where a requested content item can be vertically retrieved from the central server and horizontally retrieved from network nodes. The content retrieval delay depends on the load intensities of the retrieval sources, which have asymmetric system properties such as bandwidth...
Reducing server's bandwidth pressure is one of the key problems in the designing of peer-to-peer video-on-demand system. In this paper, we analysis and model this problem via using the “pseudo sequence scheduling”, which is widely used by many peer-to-peer video-on-demand systems. We reveal the relations between the server bandwidth consumption, the cache size and the join speed of peers. This result...
In this work we study the benefits of a peer- assisted approach to online backup applications, in which spare bandwidth and storage space of end- hosts complement that of an online storage service. Via simulations, we analyze the interplay between two key aspects of such applications: data placement and bandwidth allocation. Our analysis focuses on metrics such as the time required to complete a backup...
Peer-to-peer (P2P) on-demand streaming systems inevitably suffer from peers churn that is the inherent dynamic characteristic of overlay network. With frequent peer departure, a large amount of media data cached on peer disk turns offline and unavailable, which becomes the major reason of heavy server load. To address the above issue, a new proactive data replication mechanism is proposed and implemented...
At present, streaming media service is one of the important application of the information technology. P2P network has played an important role in the distribution of large data flow of streaming media in application The bandwidth of network and disk I/O is the main bottleneck to the transferring of real-time streaming media. Data caching technology is widely used in the area as a useful method to...
VOD (video-on-demand) system must satisfy the user's demands of real-time VCR (video cassette recording) operations; this will bring an unbearable load to server if there are a large number of concurrent users. P2P (peer to peer) technology is the key solution to the problem. With the technology, multimedia data will be cached in peers and transmitted between peers, idle bandwidth between nodes will...
The rise in peer-to-peer (P2P) networking has been tremendous in last several years; a large amount of network bandwidth backbone is consumed by P2P traffic. Although many methods have been proposed to manage P2P traffic, these methods require a lot of knowledge about the workloads and are generally difficult to implement. In this paper, we propose a mechanism of traffic cache based on P2P networks...
How to improve the scalability and QoS of peer-to-peer on-demand streaming system based on unstructured overlay is still a problem. Researchers have proposed some memory based buffering schemes to archive the targets. Considering the limited space of memory on one peer, a new caching strategy, which can integrate memory-caching strategy with disk-caching strategy, is proposed to make full use of peers...
Peer-to-Peer (P2P) networks risen as a promising approach to provide large-scale VOD services over the Internet for their potential scalability. Since videos are typically large in volume and require high communication bandwidth for delivery, many peers are unwilling to cache them in whole for serving others. In this paper, we propose a new time-based cache management on peers and a peer clustering...
In client-side segmented cache based P2P VOD system, statically cached video files in peers' disks can efficiently improve data acquisition rate. However, since disk space in a single peer is very limited, it becomes a key problem to design reasonable strategies for replacing those data segments. We start at studying the three VOD system models, and analyze the necessity of utilizing segmented storage...
Nowadays, sharing multimedia contents in P2P systems has become a common practice. In general, it is done in "download" mode as any other type of data. However, due to their huge volume and real time constraint, multimedia data present another consumption mode which is the streaming mode. In this mode, rather than downloading the entire data before viewing it, it initiates a stream from...
File sizes have grown tremendously over the past years for music/video applications and the trend is still growing. As a result, large ISPs are facing increasing demand for bandwidth from the growth of file sizes. A main contribution to this bandwidth demand problem is inefficient use of bandwidth due to many ISP customers downloading the same large files multiple times. This paper first reports real...
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