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Video-on-demand (VoD) is a rapidly growing method for viewing and sharing video content over the Internet. However, video on demand consumes a significant amount of bandwidth, forcing content publishers and content delivery networks to examine approaches such as the use of peer-to-peer (P2P) technologies to assist in video distribution. We study the performance impact of a peer localization strategy...
In order to solve the problem of the lack of fairness and poor security in online games, this paper presents a multi-granularity reputation management model for P2P MMOG. In order to accurately evaluate the reputation of the different roles of the games players, the model assesses the reputation of different roles taken by players respectively and calculates the player's reputation by fuzzy theory...
Streaming services have grown rapidly in the last few years and providers of video on-demand, such as Netflix or YouTube, are increasing the number of users even more quickly. The majority of these companies implement their services using huge Content Delivery Networks that are as much powerful as expensive, e.g. Amazon and Akamai. In this paper we propose a hybrid CDN/P2P solution that aims at reducing...
Live streaming distribution services have spread as one of the most popular services. The technique of creating contents has been developed, and users can use it easily. Accordingly, the number of contents rapidly increased. In the existing content distribution system, users must select an interesting content from a large amount of contents in the Internet. It takes long time to find out the most...
In recent years, BitTorrent traffic accounts for a substantial percentage of Internet traffic in the world. However, the current BitTorrent protocols disregards traffic cost at the underlying network and generate a large amount of inter-AS traffic. As a result, BitTorrent peers may suffer from slow download of files due to long delays. Moreover, ISPs may limit BitTorrent traffic to reduce inter-AS...
The consistent performance, energy efficiency, and reliability are important factors for real-time monitoring of a patient's data, especially in a hospital environment. In this paper a routing protocol is proposed by considering the Quality of Service requirements of the body area network data packets. A mechanism for handling delay-sensitive packets is provided by this protocol. Extensive simulations...
In this paper we compare and evaluate two multicast approaches for delay sensitive media distribution in P2P networks. First approach is based on cooperative m-ary trees, while the second approach is based on a cooperative mesh network. Both schemes exploit the full upload capacity of the participating peers and their proximity relation. Our delivery strategy involves the full cooperation between...
Current trends show an increasing number of Dedicated Channels having a Small number of Viewers (DCSV for short) in multi-channel live streaming systems. Usually, DCSV channels are either user generated or dedicated channels and they suffer adversely from poor channel performance, mainly, due to having a small number of participants. As a result, when a viewer explicitly requests for a block of streaming...
Even though many studies have dealt with the common channel issues, the detailed procedures for common channel configuration have not been paid much attention. In this paper, the fast and reliable dynamic common channel setup and reconstruction method for the point-to-point communications in DSA networks is proposed. The detailed time parameters for common channel setup and reconstruction, such as...
It is typical for enterprises to rely on services from cloud providers in order to build a scalable platform with abundant available resources to satisfy user demand, and for cloud providers to deploy a number of datacenters inter-connected with high-capacity links, across different geographical regions. In this paper, we propose that video conferencing, even with its stringent delay constraints,...
In this paper, we examine a new kind of P2P traffic localization approach exploiting the peer selection adaptation (i.e., preferring peers who are likely to provide better performance), called Netpherd. Netpherd tries to affect the peer selection adaptation to localize the P2P traffic by manipulating the network performance. To manipulate the network performance, Netpherd adds an artificial delay...
Active network measurements play an important role not only in network monitoring for OAM purposes, but also in assessing the current network status and providing real-time information for the optimization of applications. This paper proposes the extension of SNMP-based monitoring mechanisms to also support active in-network measurements conforming to the standardized OWAMP protocol. A specialized...
We present LVRI, a hybrid link-state routing protocol based on exchange of link states in a region of interest. The region of interest (ROI) is defined as a connected component of the network that includes the source, destination nodes and the nodes that act as relays for the data. An ROI is established on-demand and exists as long as there are data to be sent. Each node in the region of interest...
BitTorrent is the most widely used Peer-to-Peer (P2P) protocol and it comprises the largest share of traffic in Europe. To make BitTorrent more Internet Service Provider (ISP) friendly, BitTorrent Inc. invented the Micro Transport Protocol (uTP). It is based on UDP with a novel congestion control called Low Extra Delay Background Transport (LEDBAT). This protocol assumes that the receiver always gives...
Requirements on end-to-end latency and jitter are becoming more and more important due to new real-time services ‘delay sensitive’ to be transported. Capability to support measurements of end-to-end latency and jitter is essential in particular for Carrier Ethernet products [1]. This paper addresses a concrete example of measurement of the end-to-end latency and jitter in a Carrier Ethernet network...
Using a decentralized content distribution scheme is appealing when considering the potentially enormous amount of data generated by high quality video on demand (VoD) services. There is, unfortunately, little information available about which form of content delivery would yield maximum benefit and how it should be configured to achieve that, given a certain cost structure and request distribution...
Many Internet users use P2P live streaming services which deliver live video contents to many users. In the services, the video content is sliced into small pieces called chunks. The peers not only receive but also send the chunks to watch the video contents. Source's load for delivering is reduced. In an Offer Select method, each peer offers sendable chunks to it's neighbors. The neighbors select...
We extend the mean-field (a.k.a. fluid-analysis) approach for massively-parallel continuous-time Markov chains (CTMCs) to models with both Markovian and deterministically-timed transitions. We introduce a new low-level formalism for specifying massively-parallel models with generally-timed transitions, the population generalised semi-Markov process (PGSMP). We then show how systems of coupled delay...
The notion of a decentralized lookup service is very useful for many distributed applications. Information lookup systems using Distributed Hash Table (DHT) have been actively studied. In the Chord DHT, nodes are configured as a ring structure and lookup requests are for-warded along with the ring. In order to get information efficiently, response time should be short. However, since Chord overlay...
Recently, it has been noted that the inefficiencies in peer-to-peer (P2P) overlay networks result in a large quantity of traffic among internet service providers (ISPs) or autonomous systems (ASes). To optimize cross-ISP/AS traffic, the existing approaches introduce network-aware strategies in which peers select geographically close peers as neighbors using topological information. However, each P2P...
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