Multi-Periodic Process Networks: Technical Report

This paper aims at modeling video stream applications with structured data and multiple clocks. Multi-Periodic Process Networks (MPPN) are real-time process networks with an adaptable degree of synchronous behavior and a hierarchical structure. MPPN help to describe stream-processing applications and deduce resource requirements such as parallel functional units, throughput and buffer sizes

Multi-Periodic Process Networks: Prototyping and Verifying Stream-Processing Systems

International audienceModeling video and graphic streams with different clocks is largely an open problem. This article proposes a new kind of process network for application modeling, called Hierarchical Process Network. With properties such as abstraction, composition, synchronization and sequencing, hierarchy helps to describe stream-processing applications and deduce parameters such as throughput and buffer sizes more precisely. Real-time is explicit, as well as adaptable degrees of synchronous behavior

Evaluation d' une architecture IP orientée flot

PARIS-BIUSJ-Thèses (751052125) / SudocPARIS-BIUSJ-Mathématiques rech (751052111) / SudocSudocFranceF

DRRLV : un mécanisme d'ordonnancement pour une gestion de ressources efficace des réseaux CPL

International audienceLa technologie du Courant Porteur en Ligne (CPL) à usage domestique a franchi le débit de 200 Mbps, mais les caractéristiques de la couche physique de ce support de transmission conduisent à une capacité de lien variable. Dans ce contexte, les solutions d'accès de la couche MAC ne permettent pas une gestion équitable de ces ressources, d'autant qu'à ce jour les solutions basées sur TDMA ne sont pas déployées par tous les équipements CPL. Afin de remédier à ce problème d'équité et améliorer le service d'accès du CPL, nous utilisons un mécanisme d'ordonnancement de paquets basé sur le mécanisme Déficit Round Robin (DRR). L'objectif dans cet article est d'adapter le principe du DRR, tel qu'il est défini pour les technologies à capacité fixe, à la capacité variable des liens CPL. Pour cela, nous proposons un mécanisme dit DRRLV (DRR for Link Variation) dont l'équité est considérée en termes de temps d'occupation du lien et non pas en termes de quantité d'information transmise par le lien. L'évaluation du DRRLV révèle une amélioration significative des performances par rapport à DRR

NS-2 model of homeplug AV PLC technology

International audiencePower-Line Communication (PLC) technology has received considerable attention over the last few years because of its connectivity advantages and its transmission capacity. However, to the best of our knowledge, there is a lack of simulation tools to evaluate the performance of PLC-based networks. In this paper, we present a new PLC simulation model based on the HomePlug AV standard (HPAV) for the ns-2 simulator. This model allows the study of the prioritized HPAV CSMA-based MAC access service including PLC channel properties with OFDM and Tone Map aspects. In this access service, all of the Priority Resolution Period (PRP) and the processes of framing and segmentation are considered, and a new MAC queue system is developed to ensure HPAV flow classification. Besides, the model design enables the simulation of a hybrid In-Home or low voltage Access network with a mix of wired and wireless technologies. The model functionalities and design are reported in this paper with a preliminary performance analysis

Available bandwidth probing in hybrid home networks

International audienceA number of studies show that most of current probing tools, for available bandwidth, exhibit low accuracy, and slow convergence in Home Networks. Some reasons of this behavior include the high queuing variability of probing flows, which is induced by multiple-access mechanisms, time-variant capacity links of hybrid paths, and the instability of beta probing tools. Considering these constrains of the measurement process and the limitations of probing-tools, this paper proposes using Iperf in a lightweight mode to obtain maximum throughput of non-disruptive TCP flows to estimate the available bandwidth. Our experimental results show that Iperf doubles the accuracy of the estimates compared with IGI/PTR, Pathchirp and Wbest, on representative hybrid paths. We also show that due to the low bandwidth delay products (BDP), of home network paths, we can keep low overhead using TCP flows with convenient probing/polling intervals, which reduces the intrusiveness associated to the default Iperf usage

Piloting the home network

This article presents a way to manage and control home networking and, more specifically, a method to control the QoS within a HN. For providing this control, a new advanced platform was developed, based on a KP and unified knowledge management policies. This solution is very important for the development of mesh-networks within the home with adequate use of the combination of WiFi and PLC networks. A more extensive investigation of this technology is planned for the near future, including aspects such as congestion control and maintenance of the HN

ACEMIND: The smart integrated home network

Digital home business is a large potential market for which ACEMIND European collaborative project intends to provide a set of consistent solutions to enhance the local network management in home and small enterprises. These networks are typically constituted by some tens of devices connected to each other via a set of wired and wireless technologies. The deployment of such networks has been intensive in Europe in the last decade and will continue in the future. However common end-users still suffer from complicated installation, operation or maintenance