The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The latest experiences hint that the QoS (Quality of Service) approaches adopted by IMS (IP Multimedia Subsystem) technologies are still suffering from a primary containment factor due to the nondifferentiation between IPTV (Internet Protocol Television) video components. The success of IPTV services depends on how the customer perceives QoS related to the provided stream. The satisfaction of this...
In this paper the method of prioritized queue processing MPQ (modified priority-based queuing) is investigated. This method allows fulfilling QoS requirements for packets of real-time flows that have sustained some particular degree of the delay en-route. In order to test this method, the test bed that consists of virtual routers and traffic generators has been developed. Running experiments on this...
Nowadays service providers focus all their effort on customers' satisfaction although determining the Quality of Experience (QoE) is not a trivial task. In addition, the evolution from traditional networks towards Next Generation Networks (NGN) is enabling service providers to deploy a wide range of multimedia services such as Internet Television (IPTV), Video on Demand (VoD), and multiplayer games...
Over the last 5 years the Communications Research Group at the University of Cape Town has been actively involved in IP Multimedia Subsystem (IMS) testbed research initiatives. This paper aims to describe the research work that was done within this testbed. The work ranges from work on an IMS client, IMS based services such as IPTV and Advertising, as well as network management work relating to QoS,...
Internet Protocol Television (IPTV) describes a mechanism for transporting streams of video content encapsulated in IP packets over a managed network infrastructure using networking protocols. It provides a so called “walled garden” architecture to guarantee necessary QoE for subscribers. We analyze the different components of an IPTV system with a focus on access networks. Among many variants of...
In this paper, we propose three IMS Architectures for evaluation QoE of the IPTV service considering Subjective Measurement; in this case, we added QoE AS, which applies in a periodical time a survey to collect the QoE value, Objective Measurement; in this architecture, we propose collected information about the QoS from the IMS Policy and Charging Control entity, then, We could calculate the QoE...
IPTV is an emerging Internet application that pumps heavy video traffic to both access networks and ISP backbones. Due to the lack of commercial deployment of IP multicast, huge volume of streaming traffic may overload the servers. Hence, P2P IPTV distribution becomes popular and advances quickly. P2P IPTV uses two approaches: tree-push and mesh-pull. The latter has experienced a number of successful...
The most popular Differentiated Services composed of two key components: traffic conditioning and PHB (Per Hop Behavior). This paper addresses the affects of a packet handling mechanism LLQ (Low Latency Queuing) and several dropping schemes to quality of service in term of delay, jitter and packet loss. These schemes include RED (Random Early Detection), WRED (Weighted Random Early Detection) and...
This paper studies QoE (Quality of Experience) in Multi-View Video and Audio (MVV-A) transmission over IP networks where the users change the viewpoint by request. It jointly analyzes the effects of user interfaces for viewpoint change and contents in conjunction with network performance in a multidimensional way. In order to assess the QoE, we perform a subjective experiment which employs two user...
The IPTV services represents one of the main pillars in the development of Internet multimedia content sources worldwide and is the main driver of growth in Internet data traffic in terms of volume. In the last two years (2009–2010) we can see an explosive growth in the usage of ultra-mobile terminals having various sizes and operating systems: smartphones, tablets, Google Android, Apple iOS, Microsoft...
In recent years, we have seen the emergence of realtime applications that have delay and reliability constraints. The challenge of the transport protocol is to provide a reliable service while reducing the delay. SCTP is a reliable transport protocol that have inherited the best characteristics of TCP and UDP and provided new attractive features such as multi-homing and multi-streaming. In this paper,...
IPTV is an emerging Internet application, and is revolutionizing the entertainment and media industries. In this paper, we examine the current progress in research and development of IPTV systems. We provide an overview of two major IPTV system architectures, namely, the IP multicast architecture and the P2P architecture, and review various challenges, design issues, and interesting research problems...
Several network segments are involved in a large scale IPTV deployment, from the original video content server to the set-top-box (STB). Each network segment could be error-prone. QoS monitoring and troubleshooting are critical to guarantee satisfying user experience. In this paper, we discuss QoS monitoring and troubleshooting in AT&T U-Verse, one of the largest IPTV deployments in the world...
Prioritization of flows in a home network based on traffic classification is still no guarantee that enough bandwidth will be available between a content server and a client. Besides, such QoS technologies need to be supported by every device in the end-to-end path to be effective, which is relatively expensive for the owners of home networks. In any small-scale IP network, best effort or QoS-enabled,...
This tutorial presents on IPTV technology. Internet Protocol television (IPTV) is a system through which television services are delivered using the architecture and networking methods of the Internet Protocol suite over a packet-switched network infrastructure. IPTV services may be classified into three main groups: live television, time-shifted programming, and video on demand. IPTV can be viewed...
With open market platform for media services or applications, 3rd party service providers can register and provide their own services. Under such an environment, developing solid IP media QoS/QoE measurement system and providing measurement results to 3rd party service providers are required. In this paper, we present IP media QoS/QoE measurement system we developed and open interface technology of...
As the escalating demand for bandwidth continues, 100-Gigabit networks mark the new frontier to be ventured by networking equipment vendors. Network processors (NPUs), fast emerging as key components in 10-Gigabit platforms, will also empower the 100-Gigabit platforms. However, packet processing at these line rates presents significant challenges to network processor designs. The most important driving...
Current QoS solutions for IP networks are usually based on traffic classification and need to be supported by every device in the end-to-end path to be effective. This is relatively expensive for home networks. Alternative techniques have been proposed that require end-user services to pragmatically adapt their properties to the actual condition of the network. For this, the condition of the network...
In the IMS-based NGN service platform, live streaming is an important value-added service. But the distribution of streaming media is a difficult problem because of its massive bandwidth requirement and real-time requirement. Since IP multicast needs to update the whole network routers, this paper introduces P2P technology into live streaming system, which leverages the IP-based policy control and...
This paper presents an idea in the context of multicasting: it is to manage QoS with a certain level of hazard. The Xcast and IPv6 are used in the context of IPTV which is a contestable choice since the number of user could be high regarding the size of the packet header. In large IPTV network, even an IPTV stream with a small number of subscribers could have hundreds of them. Moreover if Xcast stream...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.