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The ever increasing demand for mobile devices especially smartphones poses newer challenges concerning data management in wireless environment. These devices have lot of constraints such as limited memory, small display size, battery power and intermittent wireless connectivity to the network. Data management and multimodal aspect of data needs to be addressed in such an environment. Caching is one...
Dynamic Adaptive Streaming over HTTP (DASH) standard was designed to improve quality of experience (QoE) by enabling video distribution at different quality levels according to the clients' network conditions. Moreover, DASH is compatible with the H.264 Scalable Video Coding (SVC) technology. In Content Delivery Networks (CDNs)-P2P hybrid approach, users can fetch contents from the CDN edge network,...
Transfer data in only one network segment is not a sticky work. However, communication between different network segments is worth studying. Especially when one or both sides network segment behind NAT devices. This text has a brief description about the classification of NAT, and explains the problems that need to be solved about NAT traversal. According to the features of NAT and the needs of our...
In recent years, availability of digital content over cyberspace has grown exponentially, which can be found using both legal and illegal means. The wide spread availability and access to Internet and also the relative ease of sharing content illegally has made music piracy a big menace. Digital Rights Management (DRM) systems have been introduced to restrict and control the unwarranted consumption...
Currently commercial live video streaming systems are based either on a typical client-server or on a peer-to-peer architecture. The former outperforms in terms of stability and quality of service, provided that the system is not stretched beyond its limits, while the latter is scalable and has a much lower cost of operation with regards to the required bandwidth resources. In this paper, we propose...
In a P2P media streaming system, a centralized tracker server is always used to maintain the topology. However, sometimes the server becomes overloaded when too many clients are coming. Then, the response time is too long because of many frequent VCR operations and the tracker server cannot support large-scale users' requests. In this paper, a distributed tracker organization is designed to solve...
Nowadays, a lot of e-Learning systems are widely deployed in educational schools. Typical e-Learning systems are implemented as client-server model. In the client-server model, the number of clients affects on the load of the server. In order to reduce the load on the server, we developed a P2P-based distributed e-Learning system. The proposed system consists of a lot of mobile agents which manage...
On providing multimedia streaming services such as live streaming, VoD, server-client model has been used. By the way, server-client model does not provide enough scalability and load concentration problems. Hence, there are several P2P solutions have been emerged. P2P-based streaming service can provide very high scalabilities and accommodate massive number of users simultaneously. In this paper,...
The peer-to-peer networking technologies and systems provide a rapid and scalable content distribution mechanism for the increasing client population to access an explosive volume of media files on the Internet. Whereas the BitTorrent protocol and its derivatives are the most popular peer-to-peer file sharing applications, this paper proposes the performance measurement and analysis of BitTorrent...
Currently P2P application is very popular for services such as file sharing, multimedia streaming, etc. With popularity of P2P application, peers participating P2P network have various capabilities and belong to heterogeneous network environments. Especially, explosively growing mobile device market trend makes heterogeneity problem of peer more serious. In order to handle the heterogeneity of peer,...
Many research activities have been provided to allow Session Initiation Protocol (SIP) based communication in Peer-to-Peer (P2P). We have contributed to these activities by proposing a scalable proxy topology building and routing in P2P SIP network where SIP location service is integrated in proxies that run over peer entities. Therefore as SIP cannot work efficiently through a NAT (Network Address...
Bee zone is a large-scale live video streaming system, which adopts dual-protocol-stack technology and gossip-like protocol to build an unstructured P2P application layer overlay, which can be used in IPv4/v6 hybrid network environment. We run the system during the 2010 FIFA World Cup South Africa. By collecting the logs from the system when it works, we study the workload, performance, and dynamics...
The rapid development of computer network has greatly popularized online education. Currently, most online education systems are using a learning platform of three-split screen courseware, in which stream media take up a majority of resources in bandwidth and storage space. Due to more and more students receiving online education, the load of stream media service is getting heavier, so that the traditional...
To solve the flux hedging in live streaming system, this paper proposes a new P2P live streaming architecture which includes a client side and a back-stage management system. Details design and implementation of key modules are also presented. Real case study shows that our system has less latency in broadcasting and better load balancing. It can realize better resource sharing among nodes and improve...
In this paper, we propose a P2P-based live streaming system called PcubeCast. Different from conventional P2P systems, PcubeCast utilizes servers to ensure end-user QoS. Thus, the proposed PcubeCast takes advantage of traditional systems: 1) Quality-of-Service(QoS) from client-server systems and 2) scalability and cost reduction from P2P systems. Through the experiments with real-world application...
According to the characteristics of 3Tnet VOD, we propose a design and implementation of Media Distribution System for streaming media, which utilizes the bandwidth of 3Tnet and improves the media distribution speed, while also providing a more scalable distribution scheme. Simulation results show that the proposed scheme could not only support VOD service on the 3Tnet in a scalable way, but also...
In this paper, we consider Peer-to-Peer Video on- Demand (P2P VoD) systems based on the Bit Torrent file sharing protocol. Since the rarest first policy adopted in the Bit Torrent protocol could not collect all pieces corresponding to a video file by their playback time, we need to develop a new piece selection rule particularly designed for P2P VoDs. In the proposed scheme, we assume the existence...
Introducing Peer-to-Peer (P2P) technology into IP Multimedia Subsystem (IMS) is hard but important, especially to the streaming media service. Based on the strength analysis of IMS and P2P, three solutions with the features of signaling centralized and media distributed are compared, and eventually the solution of managing P2P via application server is selected. For the purpose of reusing the public...
Base on the characteristics of IPTV(Internet Protocol television) Bearer Network, this paper discusses two core technologies of IPTV -- IP Multicast technology and CDN (Content Delivery Network), pointing out the advantages and shortcomings of them, then makes an analysis on several update improvement strategies of IPTV, including Controllable IP Multicast technology, P2P technology, DRM and QoE.
The large amount of bandwidth and other resources required to deliver streaming media limits the number of concurrent users. We propose a virtual active network (VAN) architecture for streaming media data delivery over wide area networks. In the proposed architecture, cooperating proxies support multiplexing and delivery of live streaming media. The hierarchical delivery structure is dynamically adjusted...
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