Papers by Rui Santos Cruz
This article presents a platform that lets users direct their own coverage of large athletic even... more This article presents a platform that lets users direct their own coverage of large athletic events, letting them set up their own virtual director and orchestrate event viewing according to their preferences.
This paper presents the design of a platform for distribution of multimedia content streams suppo... more This paper presents the design of a platform for distribution of multimedia content streams supported through innovative techniques, both in terms of media encoding and media distribution. The platform architecture accommodates the use of scalable media coding techniques, including both standard and state of the art research methods (wavelets, multiple description coding), combined with new transport and real- time streaming protocols deployed over peer-to-peer networks. Furthermore, discovery of media resources and selection of peer nodes takes into account social networking related information, as this is available in user communities over the Internet. The design of the platform is taking place in the context of the European FP7 project SARACEN
In this paper, an analysis of the different techniques for supporting robust multimedia transmiss... more In this paper, an analysis of the different techniques for supporting robust multimedia transmission over wireless media is given. The analysis includes Radio Resource Management techniques on the Physical layer, transmission techniques on the Network (IP) layer, optimisation techniques on the Transport layer and techniques focusing on the Application layer. Also there is a report on the selection of the most efficient solutions and the way these can be combined in an integrated solution is presented. The paper has been prepared following the results of the research performed in the context of the ICT project my-eDirector 2012 in order to support the robust transmission of live streaming services for the coverage of athletic events for large numbers of heterogeneous users.
The combination of Scalable Video Coding and Peer- to-Peer networks is a potential area of innova... more The combination of Scalable Video Coding and Peer- to-Peer networks is a potential area of innovation in terms of video streaming on the Internet. Applications for sharing files, such as BitTorrent, have been broadly developed and nowadays they cater for the majority of the Internet traffic, adding the need for the exploration of real-time streaming services based on these networks. Several Peer-to-Peer streaming techniques have been deployed, but very few explore bandwidth adaptation, support of diverse terminal and computational setups, adequate incentives for contributing in a multi-source streaming environ- ment or maintenance of a stable perceived video quality. This paper presents the design and implementation of a Scalable Video Coding and Peer-to-Peer Player prototype that uses a novel adaptive algorithm, the Prioritized Sliding Window, that addresses all these related issues in terms of maintaining a stable QoS/QoE. The evaluation of the prototype shows that it achieves a robust real-time streaming service, supports several terminal setups, adapts bandwidth to various access networks and discourages free-riders in the network.
User Centric Media, Jan 1, 2010
This paper presents a HTTP based multimedia content streaming architecture able to provide large ... more This paper presents a HTTP based multimedia content streaming architecture able to provide large scale WebTV services to end users connected over several access network technologies. The architecture features smooth Rate Adaptation, context Personalization information (Channel Suggestions), fast program channel switching, Network Portability (Vertical Handover) and Terminal Portability capabilities. The prototypical solution is being developed under the scope of the My-eDirector 2012 european project.
2009 Fifth International …, Jan 1, 2009
The IP multimedia subsystem (IMS), originally designed by 3GPP and later updated by 3GPP, 3GPP2 a... more The IP multimedia subsystem (IMS), originally designed by 3GPP and later updated by 3GPP, 3GPP2 and TISPAN, presents itself as an architectural framework that allows the convergence of the Internet, wireless and wireline networks and a global platform for the delivery of IP multimedia applications in next generation networks (NGN). One of the most used services to test IMS capabilities is push-to-talk (PTT). This service follows the IMS specifications and has motivated standardization work by the Open Mobile Alliance to assure interoperability between different operators. This paper describes a PTT over IMS solution designed with a talk burst control protocol based on SIP messages for call session control. The implementation was deployed and tested both with high-bandwidth LAN and CDMA2000 wireless network, demonstrating that IMS is a powerful and flexible architecture allowing the quick and easy development of multimedia applications, like PTT, for convergent networks.
…, Jan 1, 2009
This paper presents an IPTV service architecture using Session Initiation Protocol (SIP) for sess... more This paper presents an IPTV service architecture using Session Initiation Protocol (SIP) for session and media control and based on the IP Multimedia Subsystem (IMS) concept. The proposed IPTV architecture is suitable for scalable converged networks, like flexible multimedia delivery of personalized streams over a variety of channels and networking infrastructures, including mobile networks. A new Quality of Service (QoS) adaptation method allows dynamic updates of session parameters, in order to maximize the Quality of Experience (QoE) and turning the solution suitable for live multimedia streaming, independently of the cast mode (unicast or multicast). The details of both the IPTV Application Server and the IPTV Client prototypical implementations are described, as well as the results of field tests carried out across different Fixed and Mobile access networks.
User Centric Media, Jan 1, 2010
This paper presents a novel hybrid RTSP, SIP and HTTP solution for providing converged WebTV serv... more This paper presents a novel hybrid RTSP, SIP and HTTP solution for providing converged WebTV services with automatic Rate Adaptation of multimedia content. The prototypical solution, being developed under the scope of the My-eDirector 2012 european project, was deployed in a high-bandwidth LAN and some preliminary tests were performed.
Next Generation Internet (NGI), …
This paper presents the design of a HTTP Adaptive Streaming WebTV Client, featuring smooth media ... more This paper presents the design of a HTTP Adaptive Streaming WebTV Client, featuring smooth media Rate Adaptation, context Personalization, fast program channel switching and Terminal/Network Portability capabilities. The QoS-Awareness during streaming is achieved dynamically by a regulating technique that takes into account network conditions, user's device capabilities and the context of viewing. By dynamically optimizing the video quality experienced by the user, the solution provides an excellent streaming application and protocol for heterogeneous network environments.
Multimedia Tools and …
This paper describes the development, implementation and evaluation of a SIP based IPTV architect... more This paper describes the development, implementation and evaluation of a SIP based IPTV architecture with a new dynamic QoS adaptation method and signaling structure.
The implemented QoS adaptation method allows dynamic updates of session parameters, maximizing the QoE and turning the solution suitable for live multimedia streaming, independently of the cast mode (unicast or multicast).
The new SIP signaling structure, for session and media control, was developed following an All-SIP approach and a hybrid SIP+RTSP approach, both suited for an IMS environment, in order to compare the system behavior and performance using either approach.
The details of both the IPTV Application Server and the IPTV Client prototypical implementations are described, as well as the results of field tests carried out across different Fixed and Mobile access networks for each of the signaling structures.
The proposed IPTV architecture revealed to be suitable for scalable converged networks, due to its flexible multimedia delivery of personalized streams over a variety of network infrastructures, namely, Mobile radio networks.
nem-summit.eu
Motivated by the revolution in the media industry brought by recent developments in video access ... more Motivated by the revolution in the media industry brought by recent developments in video access and sharing, this paper investigates the future of internet video. We present new web standards such as HTML5, promising unified, simple and platform independent access to video files and streams, as well as novel techniques for adaptive video coding. We also analyze how these techniques can be used both over traditional client server and novel P2P based media distribution models. This analysis is followed by a description of the remaining challenges for making video a true citizen of the Web.
Multimedia, …
This paper presents a platform that gives end users the power to direct their own coverage of lar... more This paper presents a platform that gives end users the power to direct their own coverage of large athletic events, enabling users to set up their own personal ?virtual director? and orchestrate event viewing to their preferences. The platform features automatic video annotation, user preference matching to video content and dynamic adaptation to the end user environment (including terminal and network capabilities). A simplified architectural overview of the platform, together with a description of the constituent supporting modules supporting heterogeneous network infrastructures is also presented. The platform is the result of the EU funded project My-eDirector 2012, and endeavours to provide a unique technology showcase for the coverage of major athletic events with concurrent events and multitudes of cameras.
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Papers by Rui Santos Cruz
The implemented QoS adaptation method allows dynamic updates of session parameters, maximizing the QoE and turning the solution suitable for live multimedia streaming, independently of the cast mode (unicast or multicast).
The new SIP signaling structure, for session and media control, was developed following an All-SIP approach and a hybrid SIP+RTSP approach, both suited for an IMS environment, in order to compare the system behavior and performance using either approach.
The details of both the IPTV Application Server and the IPTV Client prototypical implementations are described, as well as the results of field tests carried out across different Fixed and Mobile access networks for each of the signaling structures.
The proposed IPTV architecture revealed to be suitable for scalable converged networks, due to its flexible multimedia delivery of personalized streams over a variety of network infrastructures, namely, Mobile radio networks.
The implemented QoS adaptation method allows dynamic updates of session parameters, maximizing the QoE and turning the solution suitable for live multimedia streaming, independently of the cast mode (unicast or multicast).
The new SIP signaling structure, for session and media control, was developed following an All-SIP approach and a hybrid SIP+RTSP approach, both suited for an IMS environment, in order to compare the system behavior and performance using either approach.
The details of both the IPTV Application Server and the IPTV Client prototypical implementations are described, as well as the results of field tests carried out across different Fixed and Mobile access networks for each of the signaling structures.
The proposed IPTV architecture revealed to be suitable for scalable converged networks, due to its flexible multimedia delivery of personalized streams over a variety of network infrastructures, namely, Mobile radio networks.