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—IEEE 802.15.4 is considered as the de facto standard for wireless sensor networks (WSN). However, the increased probability of collision at heavy load caused by the inherent behavior of CSMA/CA degrades the performance of WSN in terms of throughput and energy consumption. This led some to propose other MAC layer solutions to tackle these problems. Most of(More)
We describe the architecture of FlowQoS, a system that makes it easier for users in home broadband access networks to configure quality of service based on applications and devices, as opposed to obscure, low-level parameters. The central tenet of FlowQoS's design is control logic that performs application identification and uses flow-table rules to forward(More)
—A two-hop neighborhood information-based routing protocol is proposed for real-time wireless sensor networks. The approach of mapping packet deadline to a velocity is adopted as that in SPEED; however, our routing decision is made based on the novel two-hop velocity integrated with energy balancing mechanism. Initiative drop control is embedded to enhance(More)
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt età la diffusion(More)
Fair Queuing scheduling algorithms, such as Weighted Fair Queueing (WFQ) and its variants, are intended to provide hard real-time guarantees by making bandwidth reservation. However, hard guarantees are based on pessimistic estimation that leads to underutilize network resources. We propose in this paper a trade-off between hard and soft real-time(More)
– Steer-by-wire systems must meet not only reliability but also real-time requirements. This paper presents an integrated approach for evaluating both the temporal performance and the behavioral reliability of Steer-by-wire systems taking into account the delay variation introduced by network transmission errors. The considered temporal performance is the(More)