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Scalable video coding is used with peer to peer networks to minimize the upload bandwidth of peers and to reduce the effects of churn. We have formulated an NP complete optimization problem to describe the upload bandwidth at each peer. We proposed an approximation algorithm to solve this problem. Furthermore, seed servers are deployed in the network to overcome the upload bandwidth limitation at...
An information-centric network should realize significant economies by exploiting a favourable memory-bandwidth tradeoff: it is cheaper to store copies of popular content close to users than to fetch them repeatedly over the Internet. We evaluate this tradeoff for some simple cache network structures under realistic assumptions concerning the size of the content catalogue and its popularity distribution...
P2P live streaming are increasingly popular nowadays. Due to their popularity, these systems may be a target of attacks and opportunistic user behavior. In this paper, we address the pollution attacks in such systems. We present a pollution damage model and also analyze a reputation system as a tool to fight attacks in P2P live streaming systems. The model we propose evidences that attacks are harmful...
The Internet is replacing the traditional telephone network as the ubiquitous network infrastructure. Internet customers are increasing at an exponential rate and will continue to increase in the near future. Among the various Internet services, IPTV VoD (Video on Demand) service is expected to be one of the most popular services. In general, for deploying streamed video service, it is likely to use...
As audiovisual communications services become the dominant traffic source in the Future Internet, their stable coexistence and their fairness towards background traffic is an active research topic. The Internet implements flow multiplexing in a decentralized fashion via congestion control. Audiovisual media streams, however, are classified as inelastic traffic flows that do not allow rate control...
With the advances in mobile technologies, smart mobile computing devices have become increasingly affordable and powerful, leading to a significant growth in both the number of advanced mobile users and their bandwidth demands. Moreover multimedia streaming to these high-end mobile devices has become widespread. However, multimedia applications are known to be resource-hungry and in order to cope...
A key driver for the evolution of Future Media Networks (FMNs) is the emergence of beyond High Definition (HD) media formats. These formats impose far greater demands on networks for high-capacity, low latency and stringent Quality-of-Service (QoS) compared to other existing formats. In addition, their data-intensiveness will require real-time interconnection of multiple, possibly distributed, high...
Throughput-sensitive multimedia applications, such as on-demand video streaming and non-interactive live streaming require a high sending rate and a certain-level of smoothness. On the other hand, interactive streaming such as on-line conferencing requires a smooth sending rate. TFRC and TFWC support smoothness-sensitive multimedia applications, however, they cannot provide enough sending rate to...
The quick seek of VOD is vital for a high level of user satisfaction. At the same time, many server resources are required to achieve quick seek of VOD. In this research, to improve the efficiency of VOD system achieving quick seek, we propose a load balancer that clusters two types of servers. The first type is the bursty server to transmit initial video data at high throughput. The second type is...
In this paper, we address the problem of content placement in peer-to-peer systems, with the objective of maximizing the utilization of peers' uplink bandwidth resources. We consider system performance under a many-user asymptotic. We distinguish two scenarios, namely “Distributed Server Networks” (DSN) for which requests are exogenous to the system, and “Pure P2P Networks” (PP2PN) for which requests...
In peer-to-peer video-on-demand (P2P VoD) streaming services, a video server load is reduced by peers who cache data of the viewed videos and send these data to other peers instead of the video server. Although FIFO is typically used as the caching algorithm, it is not efficient for using upload bandwidth of the peers because the peers can cache the data of unpopular videos and cannot be requested...
Peer-to-peer (P2P) is a promising design paradigm for developing large-scale video distribution systems. In particular, P2P streaming systems have shown to deliver good overall video quality to its users. However, most proposed systems evaluate video quality considering mainly delay and other network related metrics, while considering spatial quality or video resolution as a fixed parameter. Evaluation...
Rate control, which involves adapting the sending rate and video rate to network environments, is effective for stably streaming stored video over unmanaged IP networks. In this paper, we propose a novel rate control technique for optimizing the evaluation function defined as user-perceived video quality using an optimal control law in modern control theory. We call our method Joint Rate Control because...
Emerging technologies such as orthogonal frequency division multiplexing (OFDM) and multiple in multiple out (MIMO) has significantly increased the bandwidth of a wireless channel. A potential application of these technologies is to distribute digital video content over wireless in a home environment. However, video streaming is bandwidth demanding, and the number of interference free wireless channels...
Spatial and temporal variations in network bandwidth constraints constitute serious challenges to the multicast distribution of real-time video content. We present a video multicast algorithm that combines multi-layered video encoding with feedback-based source adaptation in order to address varying bandwidth constraints in a multicast tree. The proposed algorithm uses a novel multicast flow control...
The Stream Control Transmission Protocol (SCTP) supports multiple streams to minimize head-of-line blocking. This requires a scheduler for sending and receiving messages of different streams, but the specification of SCTP does not make any statement regarding their implementation. Hence, after examining the possibilities, we show that several standard scheduling algorithms are a benefit when used...
This paper proposes an efficient memory system (MS) for fast block matching motion estimation algorithms, which suffer from bandwidth problem and random block data access problem. One novel data-to-memory mapping algorithm is proposed to solve these problems. By data reuse and efficient memory arrangement based on Latin Square, the bandwidth can be reduced to 5.15 Mbit/s for SVGA video. To balance...
This paper describes UTFRC - utility-driven TCP-friendly rate control, a congestion control mechanism more suitable for streaming layered scalable video streams incest-effort networks than TFRC. UTFRC relies on the original TFRC for achieving a stable throughput, but uses the throughput outputted by TFRC only as a guideline and shapes this throughput, on a coarser granularity scale, according to media...
We consider the problem of broadcasting video streams to a large number of users through P2P overlay, which is emerging as a killer application after P2P file sharing. Considerable research has been conducted in this area in recent years. But most of them are experimental or on a particular algorithm/implementation. The lacking of a general model prevents formal studies on P2P streaming. In this paper,...
Fast-growing applications like streaming media make TCP a poor fit. Because the UDP protocol lacks congestion control, equation-based and AIMD-based congestion control schemes have been two promising alternative to TCP for real-time multimedia streaming over the Internet. Past studies have shown that they are able to maintain throughput smoothness and achieve reasonable fairness with competing TCP...
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