The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper we present a novel vehicular communication protocol, which aims to reduce the effect of broadcast storm problem in VANETs. When the traffic density is above a certain value (e.g., when vehicles are in congested traffic scenarios), one of the most serious problems is the increase of packet collisions and medium contentions among vehicles which attempt to communicate.
The paper introduces Smart Grids and the methodology for the selection of ICT technologies for them. It describes the quality and implementation-operating parameters for evaluation ICT technologies and services and applications running in Smart Grids. The methodology is based on a comparison of these parameters. This methology is also based on the availability and reliability of ICT technologies....
For handling high currents and voltages reliable and durable switching devices are needed. When it comes to maximum power applications the use of gas-discharge-switches is still inevitable.
In this paper we address the issues of timeliness and transmission reliability of existing industrial communication standards. We combine a Forward Error Correction coding scheme on the Medium Access Control layer with a lightweight routing protocol to form an IEEE 802.15.4-conformable solution, which can be implemented into already existing hardware without violating the standard. After laying the...
Being reliable and real-time, are the two most challenging requirements of wireless industrial networks due to the shared, error-prone and non-deterministic behaviour of wireless communication medium. Retry-Limit (RL) parameter of IEEE 802.11 standard directly effects on the packet reliability, whereas other parameters mostly effect on packet delay. In this paper, at first the delay-reliability trade-off...
Smart grids are characterized by a dynamic nature in which distributed energy resources (DER's) changes internal states and availability over time. Distributed Energy Resources (DER's) and the distributed control system will thus be required to automatically configure itself to this dynamic behavior. This paper1 addresses communication and control challenges to achieve a plug'n'play type of DER management...
Platooning with IVC-enabled autonomous vehicles may enable a significant increase in lane capacity, if performed with constant spacing policies. However, to be effective, such system is very demanding with respect to communication performance and reliability. Dedicated short range communications (DSRC) is the prominent intervehicle communication (IVC) technology. However, its reliability rises concerns...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory (governmental) domains, the potential of Intelligent Transportation Systems (ITS) is vast. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation...
Reliability and availability have always been important characteristics of systems but become even more critical and complex issues on networks. Due to the high complexity of accurate calculation methods, simulation methods for network reliability and availability evaluation have been a popular area of research, and received significant attention. In this paper the network topology model, the failure...
Opportunistic routing is widely known to have substantially better performance than traditional unicast routing in wireless networks with lossy links. However, wireless sensor networks are heavily duty-cycled, i.e. they frequently enter deep sleep states to ensure long network life-time. This renders existing opportunistic routing schemes impractical, as they assume that nodes are always awake and...
To improve safety, a warning message in VANETs should be delivered both reliably and urgently. Existing solutions either tend to compromise propagation delay or do not reach high reliability due to broadcast storm problem caused by excessive retransmissions. We propose ReC, which exploits geographical information to help nodes autonomously achieve agreement on forwarding strategies. Each forwarding...
In this paper we develop a novel bottleneck model which assumes that the capacity of the bottleneck is stochastic and follows uniform distribution. Commuters form a heterogeneous population with distinctive requirements on the probability of punctual arrival and the commuters' trip scheduling follows user equilibrium (UE) principle in terms of the mean travel cost. The analytical solution of the proposed...
State monitoring is widely used for detecting critical events and abnormalities of distributed systems. As the scale of such systems grows and the degree of workload consolidation increases in Cloud data centers, node failures and performance interferences, especially transient ones, become the norm rather than the exception. Hence, distributed state monitoring tasks are often exposed to impaired...
A hybrid wireless network combines a mobile ad-hoc network and an infrastructure network. Efficient and reliable data routing is important for high throughput in such networks. Existing routing schemes that simply combine ad-hoc and infrastructure routings inherit the drawbacks of ad-hoc routing and fail to take advantage of the infrastructure for high efficiency. Current reputation systems relying...
The evaluating indexes for the reliability of equipment support network plays an important role in the study of equipment support networking under the information conditions, and the evaluating indexes are the precondition and foundation for testing the reliability of equipment support network. The paper firstly defines equipment support network and the reliability of the network, and then makes the...
Traditionally, transmission power is adjusted dynamically to overcome unreliability over lossy links in energy-constrained Wireless Sensor Networks (WSNs). The network node increases its transmission power to achieve immunity against link errors or lowers the power to save energy and prevent interference. Through systematic analysis, we illuminate that it adversely affects the channel contention,...
This paper discusses mobile hidden station (MHS) problem which is a significant source of packet collisions in medium access control (MAC) protocols of vehicular networks due to relatively high node speeds. MHS problem occurs when mobile stations that are not present in the channel reservation period enter and disturb the existing communications. We present effect of MHS problem using Markov model...
Wireless sensor networks (WSNs) can be used for a variety of applications. For many applications, a high reliability and low delay are required. Due to lossy feature of wireless channel, providing a reliable communication is very challenging. The most frequently used approach for providing the reliability is to use the acknowledgement based retransmission mechanism which increases the end-to-end delay...
Bias Temperature Instability (BTI) becomes one of the most important reliability issues for nanometer process devices. We focus on aging degradation by BTI because it is known as one of the dominant factor that determines life time of circuits. In this paper, we show circuit delay degradation characteristic of BTI using the circuit simulation. The delay increase 15% after 10 years stress.
A QoS-aware and priority-based multipath routing (QoSPMR) algorithm is proposed for WMSNs. The proposed algorithm comprehensively considers the categories and priorities of multimedia streams, the residual energy of nodes, the local link reliability between nodes, the local congestion status and the distance from the candidate next hop nodes to the sink. Simulation results show the QoSPMR algorithm...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.