Thibaud Rohmer - Academia.edu (original) (raw)

Papers by Thibaud Rohmer

Research paper thumbnail of Optimal Peer Selection Strategy in P2P-VoD Systems Using Dynamic Evolution Strategy

2013 IEEE International Symposium on Parallel & Distributed Processing, Workshops and Phd Forum, 2013

Peer-to-Peer Video-on-Demand (VoD) systems are rising as a new dominant way to distribute video c... more Peer-to-Peer Video-on-Demand (VoD) systems are rising as a new dominant way to distribute video content over IP networks. Although this approach improves the overall VoD system scalability, it still poses new challenges such as peers resource allocation. There has been numerous research works versed into the P2P streaming with different focus areas, and different approaches. Some work cover the resource allocation issue in P2P streaming systems where the realtime streaming add another dimension to the problem. Most work on P2P resource allocation approaches the problem with static rules strategies that fail to dynamically adjust in face of changing content demand (popularity) trends. In this paper, we focus on the problem of enhancing the performances of a P2P system by adapting the peer allocation strategy. The proposed resource allocation system dynamically switches between multiple strategies to optimally respond to observed and predicted shifts in the content popularity. To do so, a dynamic estimation problem is solved using a Levy distribution based Dynamic Evolution Strategy algorithm. The obtained results show that using a dynamic resource allocation reduces the rejection rate while maintaining high diversification in the face of a dynamically changing title demand.

Research paper thumbnail of Priori Knowledge Guided Approach for Optimal Peer Selection in P2P VoD Systems

IEEE Transactions on Network and Service Management, 2014

Research paper thumbnail of Optimisation Dynamique de l’allocation de ressources appliquée au problème de Vidéo à la demande

Research paper thumbnail of A learning-based resource allocation approach for P2P streaming systems

IEEE Network, 2015

aced with growing streaming volumes, VoD service providers are looking for ways to reduce their c... more aced with growing streaming volumes, VoD service providers are looking for ways to reduce their cost base through the design of a scalable VoD streaming system. Many research works have shown the interest of using a Peer-to-Peer (P2P) architecture to improve the scalability of video delivery systems . Most of these systems are based on P2P architectures, where titles are divided into complementary parts and stored in different peers, which are typically set-top boxes. A VoD request for a title is then satisfied through a multi-source streaming session from contributing peers to the receiving peer. A central node (SuperNode in our case) processes the VoD requests and decides which contributing peers should be selected to satisfy an incoming VoD request. We refer to the process of selecting contributing peers for a VoD request as "resource allocation" because the peer selection process has an important impact on the system resource depletion, and ultimately determines the long-term system performance.

Research paper thumbnail of On resource allocation strategies in managed peerassisted VOD streaming systems

2012 IEEE Symposium on Computers and Communications (ISCC), 2012

Research paper thumbnail of Design and analysis of a peer-assisted VOD provisioning system for managed networks

Multimedia Tools and Applications, 2012

ABSTRACT With the rise of VOD (Video-on-Demand) services provisioning as a successful service on ... more ABSTRACT With the rise of VOD (Video-on-Demand) services provisioning as a successful service on the Internet and managed networks, we are witnessing a drive towards cost-efficiency and economies of scale. Many broadband operators around the world are experimenting with P2P (Peer-to-Peer) systems centered on STBs (Set-Top-Boxes) to increase the competitiveness of their VOD services offering. By leveraging the storage and uplink bandwidth capacities available at a certain number of STBs operated by the broadband operator, the savings in terms of backend streaming capacities will represent sizable and decisive gains in cost. In these systems, video contents are usually fragmented into a number of complementary content fragments, called sub-streams, which are randomly injected in the network of STBs, and the VOD service is essentially provisioned through multisource streaming sessions from neighboring STBs to the requesting STB. One of the main challenges in such peer-assisted streaming systems remains the maximization of the utilization of STB resources utility for a given content popularity pattern. In this paper, we specifically focus on the content injection strategy and how the different content fragments should be dispatched in the network to achieve the highest performance in the VOD services provisioning epoch. We demonstrate that the random injection strategy is not appropriate for maximizing the number of simultaneous VOD streaming sessions in the network. Our objective is to first gain a better understanding of the factors driving P2P-based VOD streaming systems and provide guidelines to better operate such systems and ultimately give service operators the tools to achieve different performance objectives and/or fit specific network configurations. Further, we propose a new content dispatching strategy that maximizes the number of served VOD sessions by balancing the streaming load among the different STBs. Finally, we propose a complementary streaming resources reprovisioning mechanism that acts in real-time to reprovision the resources for serving VOD sessions to new STBs and to release trapped resources for new incoming VOD service requests.

Research paper thumbnail of Multiple Radio Simulation Support for Cyber Physical Systems

... Thibaud Rohmer, Branislav Kusy, Raja Jurdak Autonomous Systems Lab, CSIRO ICT Centre, Brisban... more ... Thibaud Rohmer, Branislav Kusy, Raja Jurdak Autonomous Systems Lab, CSIRO ICT Centre, Brisbane, Australia firstname.lastname@csiro.au ... The remainder of this paper focuses on ourim-plementation and validation of multiple radio support in the TinyOS [2] simulator. ...

Research paper thumbnail of Adaptive Peer Selection Strategy in P2P-VoD Systems Based on Dynamic Metaheuristic

Research paper thumbnail of Optimal Peer Selection Strategy in P2P-VoD Systems Using Dynamic Evolution Strategy

2013 IEEE International Symposium on Parallel & Distributed Processing, Workshops and Phd Forum, 2013

Peer-to-Peer Video-on-Demand (VoD) systems are rising as a new dominant way to distribute video c... more Peer-to-Peer Video-on-Demand (VoD) systems are rising as a new dominant way to distribute video content over IP networks. Although this approach improves the overall VoD system scalability, it still poses new challenges such as peers resource allocation. There has been numerous research works versed into the P2P streaming with different focus areas, and different approaches. Some work cover the resource allocation issue in P2P streaming systems where the realtime streaming add another dimension to the problem. Most work on P2P resource allocation approaches the problem with static rules strategies that fail to dynamically adjust in face of changing content demand (popularity) trends. In this paper, we focus on the problem of enhancing the performances of a P2P system by adapting the peer allocation strategy. The proposed resource allocation system dynamically switches between multiple strategies to optimally respond to observed and predicted shifts in the content popularity. To do so, a dynamic estimation problem is solved using a Levy distribution based Dynamic Evolution Strategy algorithm. The obtained results show that using a dynamic resource allocation reduces the rejection rate while maintaining high diversification in the face of a dynamically changing title demand.

Research paper thumbnail of Priori Knowledge Guided Approach for Optimal Peer Selection in P2P VoD Systems

IEEE Transactions on Network and Service Management, 2014

Research paper thumbnail of Optimisation Dynamique de l’allocation de ressources appliquée au problème de Vidéo à la demande

Research paper thumbnail of A learning-based resource allocation approach for P2P streaming systems

IEEE Network, 2015

aced with growing streaming volumes, VoD service providers are looking for ways to reduce their c... more aced with growing streaming volumes, VoD service providers are looking for ways to reduce their cost base through the design of a scalable VoD streaming system. Many research works have shown the interest of using a Peer-to-Peer (P2P) architecture to improve the scalability of video delivery systems . Most of these systems are based on P2P architectures, where titles are divided into complementary parts and stored in different peers, which are typically set-top boxes. A VoD request for a title is then satisfied through a multi-source streaming session from contributing peers to the receiving peer. A central node (SuperNode in our case) processes the VoD requests and decides which contributing peers should be selected to satisfy an incoming VoD request. We refer to the process of selecting contributing peers for a VoD request as "resource allocation" because the peer selection process has an important impact on the system resource depletion, and ultimately determines the long-term system performance.

Research paper thumbnail of On resource allocation strategies in managed peerassisted VOD streaming systems

2012 IEEE Symposium on Computers and Communications (ISCC), 2012

Research paper thumbnail of Design and analysis of a peer-assisted VOD provisioning system for managed networks

Multimedia Tools and Applications, 2012

ABSTRACT With the rise of VOD (Video-on-Demand) services provisioning as a successful service on ... more ABSTRACT With the rise of VOD (Video-on-Demand) services provisioning as a successful service on the Internet and managed networks, we are witnessing a drive towards cost-efficiency and economies of scale. Many broadband operators around the world are experimenting with P2P (Peer-to-Peer) systems centered on STBs (Set-Top-Boxes) to increase the competitiveness of their VOD services offering. By leveraging the storage and uplink bandwidth capacities available at a certain number of STBs operated by the broadband operator, the savings in terms of backend streaming capacities will represent sizable and decisive gains in cost. In these systems, video contents are usually fragmented into a number of complementary content fragments, called sub-streams, which are randomly injected in the network of STBs, and the VOD service is essentially provisioned through multisource streaming sessions from neighboring STBs to the requesting STB. One of the main challenges in such peer-assisted streaming systems remains the maximization of the utilization of STB resources utility for a given content popularity pattern. In this paper, we specifically focus on the content injection strategy and how the different content fragments should be dispatched in the network to achieve the highest performance in the VOD services provisioning epoch. We demonstrate that the random injection strategy is not appropriate for maximizing the number of simultaneous VOD streaming sessions in the network. Our objective is to first gain a better understanding of the factors driving P2P-based VOD streaming systems and provide guidelines to better operate such systems and ultimately give service operators the tools to achieve different performance objectives and/or fit specific network configurations. Further, we propose a new content dispatching strategy that maximizes the number of served VOD sessions by balancing the streaming load among the different STBs. Finally, we propose a complementary streaming resources reprovisioning mechanism that acts in real-time to reprovision the resources for serving VOD sessions to new STBs and to release trapped resources for new incoming VOD service requests.

Research paper thumbnail of Multiple Radio Simulation Support for Cyber Physical Systems

... Thibaud Rohmer, Branislav Kusy, Raja Jurdak Autonomous Systems Lab, CSIRO ICT Centre, Brisban... more ... Thibaud Rohmer, Branislav Kusy, Raja Jurdak Autonomous Systems Lab, CSIRO ICT Centre, Brisbane, Australia firstname.lastname@csiro.au ... The remainder of this paper focuses on ourim-plementation and validation of multiple radio support in the TinyOS [2] simulator. ...

Research paper thumbnail of Adaptive Peer Selection Strategy in P2P-VoD Systems Based on Dynamic Metaheuristic