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The operation of Ad-hoc networks depends on the cooperation among nodes to provide connectivity and communication routes. However, such an ideal situation may not always be achievable in practice. Some nodes may behave maliciously, resulting in degradation of the performance of the network or even disruption of its operation altogether. To mitigate the effect of such nodes and to achieve higher levels...
In this paper we formulate and analyze a model for assessing the reliability of a wireless sensor network (WSN) based on classifying the operating states of each node at any instant into one of three possible states: a state where both the sensing and wireless modules are operating, a state where only the wireless module is operating, and a state where the wireless module is failed. Thus, in the second...
Unattended Wireless Sensor Networks (UWSNs) operated in hostile environments face a risk on data security due to the absence of real-time communication between sensors and sinks, which imposes sensors to accumulate data till the next visit of a mobile sink to off-load the data. Thus, how to ensure forward secrecy, backward secrecy and reliability of the accumulated data is a great challenge. For example,...
We propose a physical layer approach to detect the relay node that injects false data or adds channel errors into the network encoder in multiple access relay networks. The misbehaving relay is detected by using the maximum a posteriori (MAP) detection rule which is optimal in the sense of minimizing the probability of incorrect decision (false alarm and miss detection). The proposed scheme does not...
Reliable data delivery in distributed sensor networks can be achieved by selecting error free links, prompt recovery from packet losses, and avoidance of congested gateways. Since link failures and packet losses are unavoidable in resource-constrained sensor networks, it might be necessary to tolerate a certain level of reliability without significantly affecting packets delivery performance in favor...
Recently, a new cognitive radio network architecture named after hierarchical spectrum sharing network (HSSN) is proposed to improve the utilization of the spectrum resource by taking the time and spatial dimensions of spectrum resource into account. For testing and verifying performance and reliability of algorithms and protocols for HSSN, evaluating HSSN network performance and the level of interference...
Ubiquitous technology through sensor networks is being applied to numerous industrial fields specially to increase the quality of human life (QoL). Therefore, Wireless Sensor Networks (WSNs) lossless data is one of the communications challenges to provide accurate data. Although, end-to-end data retransmission has evolved as a reliable transportation in Internet, this method is not applicable to WSNs...
This paper presents a comprehensive approach for reliability analysis of a clusterbased sensor network. A three-level hierarchical model is used for sensor networks using fault trees and use Markov chains at the bottom level to model the reliability of individual sensor nodes. The model can capture the hardware/software failures of a sensor node, failures of clusters and base station as well as channel...
This paper proposes an adaptive error control mechanism (G-AEC) for wireless media streaming, in the hope that the media could be played on receivers with high quality. This model, based on group of pictures fetching according to the frame decoding dependency model of MPEG-4 and cross-layer optimization design, which uses adaptive Forward Error Correction (FEC) at the application layer to adjust to...
Location information has become an important enabler for services that interacts with the physical environment. Focus has therefore been on providing accurate information on the user's position, but less on the reliability of the information. This paper gives a methodology to evaluate numerically the reliability of estimated positioning of mobile devices, and shows how the methodology can be applied...
While significant research effort has been dedicated to wireless localization over the past decades, most aspects of location security have been overlooked. In particular, adversaries can take advantage of security vulnerabilities of current location systems to launch location spoofing attacks, thus disguising their position in the network. In this paper, we address issues associated with location...
The traditionally wired automation infrastructure is quickly migrating to more flexible and scalable wireless solutions. To cope with the stringent requirements of process automation in terms of latency and reliability, the network resources must be optimized to ensure timely and reliable communication. This paper considers the joint routing and transmission scheduling problem for reliable real-time...
As a multimedia information acquisition and processing method, wireless multimedia sensor network (WMSN) has great application potential in military civilian. Compared with traditional wireless sensor network, the routing design of WMSN should obtain more attention on the quality of transmission. This paper proposes a reliable routing based on energy prediction (REP), which includes energy prediction...
The following topics are dealt with: ad hoc and sensor networking; communications and information systems security; communications QoS, reliability and modeling; communication software, services and multimedia applications; communication theory; next-generation networking; optical networks and systems; selected areas in communications; signal processing for communications wireless communications;...
In this paper, we study the terminal-pair reliability in grid networks. An area switched tactical communication system such as ATN (Army Tactical Network) involve large number of nodes, and of links. The resulting huge number of possible combinations of node and link failures makes it difficult to perform quantitative analysis for system survivability assessments in terms of multi-hop connectivity,...
Adaptive relaying schemes significantly improve the performance of relay networks by switching the forwarding technique according to the reliability of the received signal. In this paper, semi-analytical solution for the power optimization in adaptive relay network is derived. Furthermore, the accuracy of the solution is confirmed by using the polyblock algorithm, which is an optimization tool for...
Data packets in multi-hop wireless sensor networks require a variety of Communication Reliability (CR) according to applications. Recently, a scheme for supporting a desired CR, called AC, has proposed. In order to support the desired CR, AC simply maintains 100% of data packets of a source at intermediate nodes on a routing path which do not satisfy the desired CR. However, since AC does not consider...
Sensor nodes in Cognitive Sensor Networks (CSNs) can work on different frequency bands (or channels) according to dynamically available wireless resources. This paper proposes a spectrum-aware routing scheme for CSNs, which jointly considers traffic balance, route configuration and power control for reliable end-to-end communications. Bayesian learning method is used to estimate the number of neighboring...
Using wireless mesh network characteristics of multi-hop networks, self-organization and other features, to improve the question of the overlarge quantities of communication task, uneven use of resources lead to the problem of low reliability of network communication. Analyze the factors which affect network reliability in the processes of information communication. And combine with bandwidth, node...
Due to the mobility of nodes, servers and clients, the reliability of service delivery over MANETs is a major concern. Traditional route discovery based method is to predict and detect breakdown of connectivity and try to find an alternative path from the client to the same server (We call it traditional rerouting method). The introduction of service delivery platform over MANETs enables and facilitates...
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