This paper describes the concept of service blending—the ability of two or more services to inter... more This paper describes the concept of service blending—the ability of two or more services to interact under a unified control scheme. We introduce a novel infrastructure component, Service Broker, designed to support efficient blending through dynamically loadable program modules called steplets. We demonstrate their use through implementation of two IPTV-based service examples.
In this paper we describe music retrieval in ICOR, a project of Darmstadt TU. It is the goal of I... more In this paper we describe music retrieval in ICOR, a project of Darmstadt TU. It is the goal of ICOR to find new interfaces to support applications of music video and music CDs. Although the project consists of audio and video analysis we concentrate on a description of the audio algorithms in this paper. We describe our MPEG-7 like data
A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications ... more A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications used traditionally for file-sharing, and more recently for real-time communica tions and live media streaming. Such applications discover a route to each other through an overlay network with little knowledge of the underlying network topology. As a result, they may choose peers based on information deduced
2000 IEEE International Conference on Multimedia and Expo. ICME2000. Proceedings. Latest Advances in the Fast Changing World of Multimedia (Cat. No.00TH8532), 2000
In this paper, we present the ICOR (Intelligent COntent and Retrieval) framework, which enables t... more In this paper, we present the ICOR (Intelligent COntent and Retrieval) framework, which enables the user to easily integrate content description schemes and content analysis algorithms. We show how the generic framework can be adapted to provide appropriate meta-data for applications from different areas, such as music clips or sports games
2011 Eighth International Conference on Wireless On-Demand Network Systems and Services, 2011
Content-centric networking focuses on data delivery rather than end-to-end reachability by decoup... more Content-centric networking focuses on data delivery rather than end-to-end reachability by decoupling resources from the hosts they reside on. We consider content-centric networking as a fundamental driver for mobile ad hoc network (MANET) protocol design. We systematically evaluate the suitability and effectiveness of existing approaches toward designing a contentcentric MANET. We leverage the extensive prior work on both resource discovery and routing. To examine and compare the various existing designs, we identify a set of representative design alternatives. We develop analytical models for these designs that evaluate their efficiency for a content-centric MANET. Our models provide insights into the strengths and weaknesses of candidate design choices. Our analysis explores the performance boundaries of MANET designs and yields surprising results comparing unstructured flooding to more complex structured solutions. Based on our results, we derive a set of recommendations that are key to the successful design of a content-centric MANET.
Proceedings of the 1st International Conference on Energy-Efficient Computing and Networking - e-Energy '10, 2010
Our energy efficiency analysis of various content dissemination strategies reveals that a change ... more Our energy efficiency analysis of various content dissemination strategies reveals that a change in network architecture from host-oriented to content-centric networking (CCN) can open new possibilities for energy-efficient content dissemination. In this paper, we consider energy-efficient CCN architecture and validate its energy efficiency via trace-based simulations. The results confirm that CCN is more energy efficient than conventional CDNs and P2P networks, even under incremental deployment of CCN-enabled routers.
Conference Proceedings of the 2003 IEEE International, 2003
Multi-rate multicast has been proposed as a scalable solution to transmitting video over the Inte... more Multi-rate multicast has been proposed as a scalable solution to transmitting video over the Internet to receivers with heterogeneous and dynamic rate requirements. In this paper, the applicability of an equation-based mechanism to congestion control for a protocol which bases its join and leave actions on the calculation of the TCP response function is investigated. We focus on the rate calculation algorithm proposed in TFRC as it is currently a very promising and mature approach to calculating a TCPcompatible rate. By means of a network simulator and an adjusted TFRC protocol implementation we show that the TCP-compatible rate calculated with the algorithm as originally proposed tends to be biased when applied in environments with a low degree of statistical multiplexing. To improve the performance of the basic algorithm, a simple heuristic approach is proposed.
ABSTRACT The proliferation of pictures and videos in the Internet is imposing heavy demands on mo... more ABSTRACT The proliferation of pictures and videos in the Internet is imposing heavy demands on mobile data networks. Though emerging wireless technologies will provide more bandwidth, the increase in demand will easily consume the additional capacity. To alleviate this problem, we explore the possibility of serving user requests from other mobile devices located geographically close to the user. For instance, when Alice reaches areas with high device density – Data Spots – the cellular operator learns Alice’s content request, and guides her device to nearby devices that have the requested content. Importantly, communication between the nearby devices can be mediated by servers, avoiding many of the known problems of pure ad hoc communication. This paper argues this viability through systematic prototyping, measurements, and measurement-driven analysis.
2011 IEEE International Conference on Communications (ICC), 2011
Content-centric networking has been proposed as a new networking paradigm that is centered around... more Content-centric networking has been proposed as a new networking paradigm that is centered around the distribution of content. A key idea of content-centric networks is to address content by name and to enable nodes in the network to respond to content requests. Most proposals for content-centric networks require a "clean slate" approach and a replacement of today's TCP/IP protocol stack, which raises questions about a feasible deployment path.
Proceedings of the ACM SIGCOMM workshop on Information-centric networking - ICN '11, 2011
ABSTRACT Content-Centric Networking (CCN) and Service-Centric Networking(SCN) are two novel parad... more ABSTRACT Content-Centric Networking (CCN) and Service-Centric Networking(SCN) are two novel paradigms that seek to change the way content and services are perceived. CCN is centered around content distribution, while SCN focuses on dynamic customization of in-network services. We present SoCCeR--Services over Content-Centric Routing. SoCCeR extends CCN with integrated support for service routing decisions leveraging ant-colony optimization. SoCCeR adds a control layer on top of CCN for the manipulation of the underlying Forwarding Information Base (FIB). Without affecting content request and retrieval functionality of CCN, SoCCeR adds SCN functionality to CCN. Illustrating the interaction of SoCCeR with the routing layer, our simulation results show that SoCCeR routes service requests selectively to service instances with lighter loads and is highly responsive to network and service state changes.
2011 IEEE International Conference on Communications Workshops (ICC), 2011
Content-centric networking is a novel paradigm for the Future Internet. This paper argues that co... more Content-centric networking is a novel paradigm for the Future Internet. This paper argues that content-centric net- working should be generalized towards a service-centric net- working scheme. We propose a service-centric networking design based on an object-oriented approach, in which content and ser- vices are considered objects. We show implementation architec- tures for example services and how these can benefit from
... Faults Errors Failures Procurement V alidation A vailability Reliability Safety (Security) ..... more ... Faults Errors Failures Procurement V alidation A vailability Reliability Safety (Security) ... It is obvious that the topology dynamics are directly related to the dynamics of the routing ... Moreover, the wireless nature of the communication channel contributes to the routing system in ad ...
In this paper we explain how camera zooms in digital video can be recognized automatically. To ac... more In this paper we explain how camera zooms in digital video can be recognized automatically. To achieve this goal we propose a new algorithm to detect zooms automatically and present experimental data on its performance.
2008 Eighth International Conference on Peer-to-Peer Computing, 2008
ABSTRACT One of the key questions in dimensioning a hybrid P2P content distribution system is tha... more ABSTRACT One of the key questions in dimensioning a hybrid P2P content distribution system is that of the required infrastructure support in terms of server bandwidth. In this paper, we develop and propose simple mathematical models for analyzing and dimensioning hybrid peer-to-peer content distribution networks. We first use a deterministic fluid model to capture the essential peer and server dynamics within a single swarm, and subsequently derive a stochastic fluid model to capture the dynamics in the case of multiple swarms, i.e., concurrent swarms of a number of content objects. Based on the models, we derive solutions for estimating the server capacity required to support a single swarm as well as a number of concurrent file swarms at a given level of service quality. Numerical results demonstrate how a hybrid P2P approach can yield substantial performance gains and capacity savings compared to a pure client/server system, with churn rate and upload bandwidth being critical factors. Compared to a pure peer-to-peer scenario, the hybrid approach can dramatically boost the performance and improve reliability.
IEEE INFOCOM 2009 - The 28th Conference on Computer Communications, 2009
The consumer interest in mobile multimedia content is on the rise, driven by the higher bandwidth... more The consumer interest in mobile multimedia content is on the rise, driven by the higher bandwidth of 3G networks and by the availability of low-cost high-resolution mobile devices. However, providing a good user experience remains a challenge due to bandwidth bottlenecks at peak time, channel quality variations and high battery drain incurred by long data transmission times at lower bandwidths.
Proceedings IEEE International Conference on Multimedia Computing and Systems, 1999
We explain how camera pans and zooms in digital video can be used to create a panoramic view of a... more We explain how camera pans and zooms in digital video can be used to create a panoramic view of a video clip reordering the frames. As the view will normally be too large to be displayed on a single screen we propose the use of a grid where the user can move a virtual camera in different directions which are
To accommodate heterogeneous transmission conditions in a streaming scenario several multi-rate m... more To accommodate heterogeneous transmission conditions in a streaming scenario several multi-rate multicast solutions have been proposed, based on simulcasting or hierarchical layering. At present, most of these schemes follow a receiver-driven layered multicast approach, where the receivers join or leave a subset of the session's fixed-rate layers in response to changing network condi- tions. Yet, recently fine-grained coding schemes are
Security and Watermarking of Multimedia Contents II, 2000
... With the help of speech recognition technology it is possible to embed the spoken text, the c... more ... With the help of speech recognition technology it is possible to embed the spoken text, the content, of an audio file in the ... In our paper we describe an approach to ensure the integrity of multimedia streams using a combination of robust watermarking and content ...
This paper describes the concept of service blending—the ability of two or more services to inter... more This paper describes the concept of service blending—the ability of two or more services to interact under a unified control scheme. We introduce a novel infrastructure component, Service Broker, designed to support efficient blending through dynamically loadable program modules called steplets. We demonstrate their use through implementation of two IPTV-based service examples.
In this paper we describe music retrieval in ICOR, a project of Darmstadt TU. It is the goal of I... more In this paper we describe music retrieval in ICOR, a project of Darmstadt TU. It is the goal of ICOR to find new interfaces to support applications of music video and music CDs. Although the project consists of audio and video analysis we concentrate on a description of the audio algorithms in this paper. We describe our MPEG-7 like data
A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications ... more A significant part of the Internet traffic today is generated by peer-to-peer (P2P) applications used traditionally for file-sharing, and more recently for real-time communica tions and live media streaming. Such applications discover a route to each other through an overlay network with little knowledge of the underlying network topology. As a result, they may choose peers based on information deduced
2000 IEEE International Conference on Multimedia and Expo. ICME2000. Proceedings. Latest Advances in the Fast Changing World of Multimedia (Cat. No.00TH8532), 2000
In this paper, we present the ICOR (Intelligent COntent and Retrieval) framework, which enables t... more In this paper, we present the ICOR (Intelligent COntent and Retrieval) framework, which enables the user to easily integrate content description schemes and content analysis algorithms. We show how the generic framework can be adapted to provide appropriate meta-data for applications from different areas, such as music clips or sports games
2011 Eighth International Conference on Wireless On-Demand Network Systems and Services, 2011
Content-centric networking focuses on data delivery rather than end-to-end reachability by decoup... more Content-centric networking focuses on data delivery rather than end-to-end reachability by decoupling resources from the hosts they reside on. We consider content-centric networking as a fundamental driver for mobile ad hoc network (MANET) protocol design. We systematically evaluate the suitability and effectiveness of existing approaches toward designing a contentcentric MANET. We leverage the extensive prior work on both resource discovery and routing. To examine and compare the various existing designs, we identify a set of representative design alternatives. We develop analytical models for these designs that evaluate their efficiency for a content-centric MANET. Our models provide insights into the strengths and weaknesses of candidate design choices. Our analysis explores the performance boundaries of MANET designs and yields surprising results comparing unstructured flooding to more complex structured solutions. Based on our results, we derive a set of recommendations that are key to the successful design of a content-centric MANET.
Proceedings of the 1st International Conference on Energy-Efficient Computing and Networking - e-Energy '10, 2010
Our energy efficiency analysis of various content dissemination strategies reveals that a change ... more Our energy efficiency analysis of various content dissemination strategies reveals that a change in network architecture from host-oriented to content-centric networking (CCN) can open new possibilities for energy-efficient content dissemination. In this paper, we consider energy-efficient CCN architecture and validate its energy efficiency via trace-based simulations. The results confirm that CCN is more energy efficient than conventional CDNs and P2P networks, even under incremental deployment of CCN-enabled routers.
Conference Proceedings of the 2003 IEEE International, 2003
Multi-rate multicast has been proposed as a scalable solution to transmitting video over the Inte... more Multi-rate multicast has been proposed as a scalable solution to transmitting video over the Internet to receivers with heterogeneous and dynamic rate requirements. In this paper, the applicability of an equation-based mechanism to congestion control for a protocol which bases its join and leave actions on the calculation of the TCP response function is investigated. We focus on the rate calculation algorithm proposed in TFRC as it is currently a very promising and mature approach to calculating a TCPcompatible rate. By means of a network simulator and an adjusted TFRC protocol implementation we show that the TCP-compatible rate calculated with the algorithm as originally proposed tends to be biased when applied in environments with a low degree of statistical multiplexing. To improve the performance of the basic algorithm, a simple heuristic approach is proposed.
ABSTRACT The proliferation of pictures and videos in the Internet is imposing heavy demands on mo... more ABSTRACT The proliferation of pictures and videos in the Internet is imposing heavy demands on mobile data networks. Though emerging wireless technologies will provide more bandwidth, the increase in demand will easily consume the additional capacity. To alleviate this problem, we explore the possibility of serving user requests from other mobile devices located geographically close to the user. For instance, when Alice reaches areas with high device density – Data Spots – the cellular operator learns Alice’s content request, and guides her device to nearby devices that have the requested content. Importantly, communication between the nearby devices can be mediated by servers, avoiding many of the known problems of pure ad hoc communication. This paper argues this viability through systematic prototyping, measurements, and measurement-driven analysis.
2011 IEEE International Conference on Communications (ICC), 2011
Content-centric networking has been proposed as a new networking paradigm that is centered around... more Content-centric networking has been proposed as a new networking paradigm that is centered around the distribution of content. A key idea of content-centric networks is to address content by name and to enable nodes in the network to respond to content requests. Most proposals for content-centric networks require a "clean slate" approach and a replacement of today's TCP/IP protocol stack, which raises questions about a feasible deployment path.
Proceedings of the ACM SIGCOMM workshop on Information-centric networking - ICN '11, 2011
ABSTRACT Content-Centric Networking (CCN) and Service-Centric Networking(SCN) are two novel parad... more ABSTRACT Content-Centric Networking (CCN) and Service-Centric Networking(SCN) are two novel paradigms that seek to change the way content and services are perceived. CCN is centered around content distribution, while SCN focuses on dynamic customization of in-network services. We present SoCCeR--Services over Content-Centric Routing. SoCCeR extends CCN with integrated support for service routing decisions leveraging ant-colony optimization. SoCCeR adds a control layer on top of CCN for the manipulation of the underlying Forwarding Information Base (FIB). Without affecting content request and retrieval functionality of CCN, SoCCeR adds SCN functionality to CCN. Illustrating the interaction of SoCCeR with the routing layer, our simulation results show that SoCCeR routes service requests selectively to service instances with lighter loads and is highly responsive to network and service state changes.
2011 IEEE International Conference on Communications Workshops (ICC), 2011
Content-centric networking is a novel paradigm for the Future Internet. This paper argues that co... more Content-centric networking is a novel paradigm for the Future Internet. This paper argues that content-centric net- working should be generalized towards a service-centric net- working scheme. We propose a service-centric networking design based on an object-oriented approach, in which content and ser- vices are considered objects. We show implementation architec- tures for example services and how these can benefit from
... Faults Errors Failures Procurement V alidation A vailability Reliability Safety (Security) ..... more ... Faults Errors Failures Procurement V alidation A vailability Reliability Safety (Security) ... It is obvious that the topology dynamics are directly related to the dynamics of the routing ... Moreover, the wireless nature of the communication channel contributes to the routing system in ad ...
In this paper we explain how camera zooms in digital video can be recognized automatically. To ac... more In this paper we explain how camera zooms in digital video can be recognized automatically. To achieve this goal we propose a new algorithm to detect zooms automatically and present experimental data on its performance.
2008 Eighth International Conference on Peer-to-Peer Computing, 2008
ABSTRACT One of the key questions in dimensioning a hybrid P2P content distribution system is tha... more ABSTRACT One of the key questions in dimensioning a hybrid P2P content distribution system is that of the required infrastructure support in terms of server bandwidth. In this paper, we develop and propose simple mathematical models for analyzing and dimensioning hybrid peer-to-peer content distribution networks. We first use a deterministic fluid model to capture the essential peer and server dynamics within a single swarm, and subsequently derive a stochastic fluid model to capture the dynamics in the case of multiple swarms, i.e., concurrent swarms of a number of content objects. Based on the models, we derive solutions for estimating the server capacity required to support a single swarm as well as a number of concurrent file swarms at a given level of service quality. Numerical results demonstrate how a hybrid P2P approach can yield substantial performance gains and capacity savings compared to a pure client/server system, with churn rate and upload bandwidth being critical factors. Compared to a pure peer-to-peer scenario, the hybrid approach can dramatically boost the performance and improve reliability.
IEEE INFOCOM 2009 - The 28th Conference on Computer Communications, 2009
The consumer interest in mobile multimedia content is on the rise, driven by the higher bandwidth... more The consumer interest in mobile multimedia content is on the rise, driven by the higher bandwidth of 3G networks and by the availability of low-cost high-resolution mobile devices. However, providing a good user experience remains a challenge due to bandwidth bottlenecks at peak time, channel quality variations and high battery drain incurred by long data transmission times at lower bandwidths.
Proceedings IEEE International Conference on Multimedia Computing and Systems, 1999
We explain how camera pans and zooms in digital video can be used to create a panoramic view of a... more We explain how camera pans and zooms in digital video can be used to create a panoramic view of a video clip reordering the frames. As the view will normally be too large to be displayed on a single screen we propose the use of a grid where the user can move a virtual camera in different directions which are
To accommodate heterogeneous transmission conditions in a streaming scenario several multi-rate m... more To accommodate heterogeneous transmission conditions in a streaming scenario several multi-rate multicast solutions have been proposed, based on simulcasting or hierarchical layering. At present, most of these schemes follow a receiver-driven layered multicast approach, where the receivers join or leave a subset of the session's fixed-rate layers in response to changing network condi- tions. Yet, recently fine-grained coding schemes are
Security and Watermarking of Multimedia Contents II, 2000
... With the help of speech recognition technology it is possible to embed the spoken text, the c... more ... With the help of speech recognition technology it is possible to embed the spoken text, the content, of an audio file in the ... In our paper we describe an approach to ensure the integrity of multimedia streams using a combination of robust watermarking and content ...
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Papers by Ivica Rimac