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Using Peer-to-Peer (P2P) overlay networks have become a progressively popular approach for streaming live media over the Internet due to their deployment simplicity and scalability. In this paper, we propose a new hybrid push-pull live P2P video streaming protocol called PPM that combines the benefits of pull and push mechanisms for video delivery. Our main goal is to minimize the network end-to-end...
High-performance networks have been increasingly deployed to provision dedicated channels for large data transfers over long distances to support various network-intensive applications with promised Quality of Service in terms of bandwidth and delay. These networks are generally capable of both advance and immediate bandwidth reservations, the former reserving resources ahead of time in a future time...
If network congestion occurs, packets cannot be delivered timely, the data rate decreases significantly and the required level of QoS cannot be achieved for all nodes. Especially in Home Area Networks (HANs) with limited uplink bandwidth for internet access, congestion is a major problem. Different approaches for congestion aware link sharing and QoS provisioning exist. Also the Distributed Fair Congestion...
ECG signals received from a long distance call through mobile phone network need to be displayed instantaneously, smoothly and recorded. Due to non-uniform load and inherent time delay in the network the real-time display is incoherent. This will cause some discomfort or inaccuracies in observing the waveform at the critical moment, and then more or less affect the quality of work performed by the...
Vehicular network is different from wired network due to its network environment changes rapidly. The connection lifetime between vehicles is usually short because vehicles move in high speeds. Hence, deploy peer-to-peer (p2p) applications over vehicular network is a challenging research issue. There are many problems confronted in p2p file sharing, e.g. how to search files effectively, how to share...
Small playback lag in live streaming is important for time-critical and interactive applications such as live stock, market updates, sports and remote education. In this paper, we present Elite addresses the playback lag problem in peer-assisted live streaming systems. Instead of deploying a large initial offset to all the users, Elite seeks the possibility of initializing users with layered proportional...
In order to solve the problem of transporting e-VLBI data in fast long distance networks, a new TCP algorithm is proposed in this paper. This new algorithm directly relays on the application layer to adjust its congestion window (cwnd) and transfer rate, so we named it ABCTCP (Application Based rate Controllable TCP). To reach the desired throughput, ABCTCP increases its cwnd aggressively without...
So far latency has been regarded as a minor issue in Passive Optical Networks (PONs). However it may become a key factor for the commercial success of PON and WDM-PON. In this work we review the relevance of very-low latency in the access as the enabler of new higly-interactive cloud services. Then, we propose an approach for delay-based differentiation in PON that causes the delay variance to become...
Transmission Control Protocol (TCP) carries the maximum Internet traffic, so performance of TCP largely affects the performance of Internet. However, end-to-end throughput in TCP degrades notably when operated in wireless networks, since random packet losses and packet reordering are considered as congestion. In wireless networks, due to high bit error rate and changing level of congestion, retransmission...
3D Tele-immersive systems create real-time multi-stream and multi-view 3D collaborative contents from multiple sites to allow interactive shared activities in virtual environments. Applications of 3DTI include online sports, tele-health, remote learning and collaborative arts. In addition to interactive participants in 3DTI environments, we envision a large number of passive non-interactive viewers...
A heterogeneous network, where a switched Ethernet backbone interconnects several existing CAN buses via bridges, is a promising candidate to build a large scale network. For real-time applications, deterministic communication is a key issue. A worst-case delay analysis on such a network has to deal with heterogeneity properties, such as different bandwidths, scheduling policies and bridging strategies...
Online videos are one of the most prevalent forms of communication over the Internet because humans are attracted to visual stimulations. Multimedia services, especially real-time services, require data to arrive on time. Unlike any other transmissions, video streaming needs to be monitored and adapted to bandwidth, when the video stream passes through the best-effort environment. A guaranteed QoS...
Active Queue Management (AQM) algorithm, as a typical router based congestion control strategy, has been the focus of researchers in the past few years and widely used in congestion control. There are a few drawbacks such as large queuing delay and queue jitter, which cause data retention drop and oscillation. It means that the existing AQM algorithms under high bandwidth can not meet the Quality...
The optimal allocation of Communication-Intensive Applications is a well-know complex issue in Clouds. This kind of applications, due to the strong impact of communications on their performance, requires not only that their tasks are allocated on resources able to satisfy their computational requirements but also that the distance among these resources, in terms of communication delay or latency,...
The use of dynamic optical circuits for IP offloading, also referred to as optical bypass, was proposed to counter overloading in IP networks caused by sudden traffic surges. Approaches proposed to date use single path routing to setup optical bypass. However, the discrete bandwidth granularities of optical circuits may lead to the so-called bandwidth mismatch issue where the capacity of an optical...
We study the effect of TCP synchronization on Optical Burst Switched (OBS) networks and its impact on capacity dimensioning. The synchronization of TCP flows appears when a burst with segments from different TCP flows is discarded, making that all TCP flows reduce their transmission rate at the same time, leading to inefficient bandwidth sharing. This paper analyzes the bandwidth capacity that needs...
Ring-oscillators provide a low-cost digital VCO solution in fully integrated PLLs, but due to their supply noise sensitivity and high noise floor, their applications have been limited. A fully integrated feed-forward, delay-discriminator based adaptive noise-cancellation architecture that improves phase noise characteristic of ring-oscillators outside the PLL bandwidth is presented. Proposed technique...
This article proposes a mechanism to increase the energy efficiency of the upstream channel in TDM-base PONs. Essentially, the ONUs are encouraged to accumulate traffic and transmit data bursts just by increasing the cycle time values artificially. The guard time is enlarged to avoid the case where ONUs are queried by the OLT and have none or few packets to transmit, thus allowing more time to sleep...
HTTP Adaptive Streaming (HAS) is rapidly becoming a key video delivery technology for fixed and mobile networks. However, today there is no solution that allows network operators or CDN providers to perform network-based QoE monitoring for HAS sessions. We present a HAS QoE monitoring system, based on data collected in the network, without monitoring information from the client. To retrieve the major...
Mobile Access Gateway (MAG) is a component of Proxy Mobile IPv6 (PMIPv6) which provides network-layer transparent mobility to mobile nodes (MN). MAG serves a local geographical area and mobile nodes in its vicinity may attach to it to get the mobility services from its controlling PMIPV6 domain. Since MAG is the point of attachment of mobile nodes, negotiated and guaranteed quality of service (QoS)...
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