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With the rapid development of network technology and network services, the users' requirements of network QoS are also improved. The traditional Active Queue Management(AQM) mechanisms are not adequate to provide QoS guarantee to multimedia video traffics effectively. To provide better quality of service to the multimedia applications in Mobile Ad Hoc Network(MANETs), whose resource is limited and...
Nowadays main service providers are launching the initial mobile TV commercial services, which are offered from wireless broadband networks. This article shows a common architecture for monitoring the QoS (Quality of Service) of mobile TV platforms. This solution, which is based on the analysis of quality figures through network probes, will allow service providers to offer their audiovisual services...
In the (mobile) communications domain, Quality of Experience (QoE) has become the ultimate metric influencing the success or failure of new applications and services. Since it is increasingly argued in the literature that QoE should be seen as a multi-dimensional concept, this paper focuses on QoE from an interdisciplinary perspective. In this paper, we discuss a framework that can be used for the...
In recent years a number of research efforts have focused on effective use of P2P-based systems in providing large scale video streaming services. In particular, live streaming and Video-on-Demand (VoD) systems have attracted much interest. While previous efforts mainly focused on the common challenges faced by both types of applications, there are still a number of fundamental open questions in designing...
Network coding has been shown to be capable of greatly improving quality of service in P2P live streaming systems (e.g., IPTV). However, network coding is vulnerable to pollution attacks where malicious nodes inject into the network bogus data blocks that are combined with other legitimate blocks at downstream nodes, leading to incapability of decoding the original blocks and substantial degradation...
Video streaming applications are commonly used in both wired and wireless environment; however, wireless links are burden by higher packet loss ratio and delay variation. In order to make video transmission possible in wireless networks MPEG video coding is usually used to reach the bandwidth constrains of the links. The video quality and compression ratio depends on Group of Pictures (GOP) structure,...
Multimedia services are typically much more sensitive to throughput, delay, and packet loss than traditional services. These parameters give technical performances of the network but they do not reveal QoS perceived by users. Hence, how to capture users' overall perceptions when they are using network services is an important issue. In this paper, we simulate a streaming video environment in bandwidth...
Over the last years many technological advances were introduced in Internet television to meet user needs and expectations. However due to an overwhelming bandwidth requirements traditional IP-based television service based on simple client-server approach remains restricted to small group of clients. In such situation the use of the peer-to-peer overlay paradigm to deliver live television on the...
This paper addresses the issue of buffer underflow in wireless multimedia service, due to both the unreliable and time-varying nature of the wireless channel. Specifically, we propose a statistical model to estimate the buffer underflow time. Based on the estimation of the underflow time, a scene-aware adaptive playout algorithm with dual-threshold to adjust the frame rate is presented. This approach...
Emerging multimedia applications over mobile devices are becoming very popular, especially over infrastructure wireless networks such as cellular and WLANs. However, providing this kind of services over infrastructure-less networks like ad hoc networks presents many additional problems. One of these problems is how to share resources fairly among the users involved. In this article we propose a QoS...
The design of effective broadband mobile healthcare systems using emerging WiMAX networks is an important issue, especially for remote medical diagnostic systems. In this paper, we introduce a new cross layer design approach for medical video streaming in WiMAX networks. The proposed approach is based on optimising medical Quality of Service (m-QoS) in the network environments. Preliminary performance...
Wireless medical ultrasound streaming is considered one of the emerging application within the broadband mobile healthcare domain. These applications are considered as bandwidth demanding services that required high data rates with acceptable diagnostic quality of the transmitted medical images. In this paper, we present the performance analysis of a medical ultrasound video streaming acquired via...
Multimedia services have gained an increasing interest of industry and the research community over the last decade. In this paper we present an RTP-based platform for video streaming evaluation in simulated environments. We have developed a new NS-2 module providing an accurate RTP and RTCP implementation (following strictly the RFC 3550 specification) and we propose to combine it with several tools...
This paper presents a real-time adaptive video streaming system based on the latest standardized video codec H.264/MPEG-4 AVC scalable extension (SVC). The system provides a full MPEG-21 media access framework over heterogeneous networks and terminals with end-to-end QoS control and multimedia adaptation based on SVC. This adaptive streaming system is composed of a server with a real-time SVC encoder,...
The evolution of the WCDMA air interface, namely High Speed Downlink Packet Access (HSDPA) allows UMTS networks to improve network capacity and increase the theoretical data rates up to or above 10 Mbps. However, in HSDPA networks and the shared downlink radio channel used in HSDPA stills suffers from the insufficient data rates and are considered a challenging environment for delay and loss-sensitive...
A useful measure for characterizing the degree of bursty loss is studied. The growth of the Internet technology enables us to use network applications for streaming audio and video. In such applications, bursty loss of packets has much effect on the quality of service (QoS) in these applications. Actually, whether a packet is successfully received or lost depends heavily on the result of the transmission...
Ultra-wideband (UWB) is a new wireless technology that transfers data over shorter distances with higher data rates and lower transmission power. WiMedia Alliance's Media Access Control (MAC) protocols for UWB-based wireless personal area networks have become an international standard. The Distributed Reservation Protocol (DRP) is part of this standard that reserves the wireless channel on a slot-by-slot...
Video distributions using TCP (called "TCP streaming") like YouTube have been increased rapidly with the improvement on the speed and capacity of the Internet. Thus, it is an important technical issue to guarantee QoS (quality of service) suitable for TCP streaming. However, it is difficult for the existing IP network to guarantee QoS of the TCP streaming. So far, in order to achieve the...
Due to the advance of WLAN technology, the use of the multimedia service such as the video streaming service has been increased in the home network or CCTV monitoring for cars or construction materials. However, we need to study the method which decreases the transmission delay and the frame loss rate to provide QoS of the video streaming service. Therefore, this paper proposes an active buffer management...
In this paper we propose SWOR, an architecture to deliver Scalable Video Coding (SVC) contents over P2P network. SWOR architecture is based on twofold mechanisms: (1) organization of peers in Small-World (SW) overlay networks, (2) delivering SVC content using push-pull mechanism. SWOR is evaluated and compared with CoolStreaming/DONet (CS) on QoS metrics using NS-2 simulator. Performance evaluation...
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