Yeqiong Song

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The use of networks for communications between the electronic control units (ECU) of a vehicle in production cars dates from the beginning of the 1990s. The specific requirements of the different car domains have led to the development of a large number of automotive networks such as Local Interconnect Network, J1850, CAN, TTP/C, FlexRay, media-oriented(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)
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)
Duty-cycling technique has been widely adopted in MAC protocols for wireless sensor networks to conserve energy. However, low duty-cycle also leads to limited throughput in most of existing solutions. In this paper, we propose iQueue-MAC to provide immediate yet energy-efficient throughput enhancement for dealing with burst or heavy traffic. Combined with(More)
Existing low-power MAC protocols only provide low throughput because of the fixed low duty-cycle. This often leads to poor performance when dealing with timeconstrained burst traffic. In this paper, we propose a new hybrid CSMA/TDMA MAC protocol, called QueueMAC, that dynamically adapts the duty-cycle according to the current network traffic. The queue(More)
(m,k)-firm model has recently drawn a lot of attention. It provides a flexible real-time system with graceful degradation of the QoS, thus achieving the fault tolerance in case of system overload. In this paper we first give a review of the existing work on the use of the (m,k)-firm model for handling the QoS and fault tolerance management. Then we focus on(More)
The X-by-Wire systems in cars can only be accepted if they provide at least the same dependability than the traditional ones. In this paper we propose a new approach to evaluate the impact of the EMI perturbations on the dependability of an X-by-Wire architecture. The considered X-by-Wire architecture is distributed around a TDMA-like communication(More)
IEEE 802.15.4 protocol stack is the basis of many wireless sensor networks (WSN) and has been proposed for low data rate and low power applications. The standard defines a duty cycle in order to allow devices to achieve efficient energy consumption. Defining the best duty cycle configuration becomes important to extend the network life time. Several works(More)
This paper describes a system design approach for wireless sensor network based wildfire monitoring, including the system architecture, hardware and software framework. Effectiveness of the solution is evaluated in terms of reactivity, reliability, robustness and network lifetime. The main contribution of the paper is the design of a sensor network that can(More)