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In recent years, with the rapid development of China's high-speed railway, high-speed rail EMU production is also increasing, but the existing high-speed rail EMU brake test system requires a lot of manual operation, recording, workload, braking signal and data, vehicle status confirmation can not be centralized managed, archiving. The structure is complex with high maintenance requirements and the...
Infrastructure monitoring is an important class of wireless sensor network (WSN) applications. When the topology of a WSN designed for infrastructure monitoring is linear in nature, such as bridges, highways and pipelines, this kind of WSN is known to be linear WSN (LWSN). To achieve the high-reliable infrastructure monitoring services, hybrid LWSN has been designed where a limited number of support...
A large number of sensor nodes are deployed to remote locations and left unattended for a long time in wireless sensor network applications. When a battery-powered sensor node depletes its energy, it is assumed as “dead” and recharging or replacing the battery is not possible in most of the applications. Lifetime of the wireless sensor network depends on the efficient use of available restricted energy...
Cooperative communication approaches are being increasingly used to improve the reliability of Wireless Sensor Networks (WSNs) communication, allowing better spatial and temporal diversity. For the success of these techniques, a proper selection of the relay nodes is a crucial task. This paper proposes a new technique, named Smart, for the selection of cooperating WSN nodes according to criteria considered...
This paper proposes PBRR and Blowfish algorithms to achieve three factors in one dimensional (1-D) queue network. These factors are network lifetime, increased packet delivery ratio and average residual energy. Network lifetime is defined as amount of time the nodes are awake in the network. Packet delivery ratio is defined as ratio of number of packets received by destination to the number of packets...
The use of wireless sensor networks (WSN) to support critical monitoring applications is becoming a relevant topic of interest. These networks allow a highly flexible approach to data monitoring and, consequently, a major breakthrough for several application domains, from industrial control applications to large building domotics and health care applications. One of the major impairments of using...
We propose a relay subset selection method for two-hop Wireless Sensor Networks (WSNs) where the source-relay links are modeled as time-varying fading channels. Assuming perfect channel estimation at relays, the channel state is quantized to binary levels, called as Good and Bad states, and is modeled by a Gilbert-Elliott channel. The relays compress their quantized channel state information and transmit...
Recently, many Internet of Things (IoT) or wireless sensor network (WSN) applications adopt ZigBee as their communication protocol. In these applications, messages may need to be disseminated to some specific objects or nodes using multicast transmissions. However, we observe that the original ZigBee multicast protocol causes extremely high packet overhead and energy consumption. In this work, we...
This paper compares the performance of two schemes that rely on relays to ensure the reliability of the communication in ultra wideband body networks. Dual hop and cooperative diversity architectures are compared and the performance superiority of this latter is assessed with different modulation orders and number of relay nodes.
This paper presents cooperative routing scheme to improve data reliability. The proposed protocol achieves its objectives, however, at the cost of surplus energy consumption. Thus sink mobility is introduced to minimize the energy consumption cost of nodes as it directly collects data from the network nodes at minimized communication distance.
Energy efficiency is one of the most important performances of a wireless sensor network. In this paper, we show that choosing a proper transmission scheme given the channel and network conditions can ensure a high energy performance in different transmission environments. Based on the energy models we established for both cooperative and non-cooperative communications, the efficiency in terms of...
Performance of multihop cooperative sensor networks depends on relaying candidate selection, optimal relay assignment, and cooperative communication. In this paper, we first propose a novel relaying candidate selection scheme (KCN-selection) to choose k-cooperative nodes (KCN) at each hop based on geographic information, while the certain number of k is initially determined based on an on-demand end-to-end...
This paper deals with a way to probabilistically guarantee reliable packet delivery in WirelessHART based networks suitable for industrial control systems. We propose a new scheduling scheme, called Iterative Probabilistic Scheduling with Adaptive Relaying (IPS-AR), which consists of a static part (IPS) and a dynamic part (AR). IPS takes into account the channel characteristics and exploits relaying...
Wireless sensor networks (WSNs) have become an effective technique in monitoring water, oil, and gas pipelines. Wireless sensor nodes have played a greater role in multidimensional applications such as tactical monitoring, weather monitoring, and battlefield detecting. Combined wireless nodes create a network in a distributed manner. They can provide accurate results in both aboveground and underground...
This paper considers the problem of intra-interference in a Wireless Body Area Network (WBAN). The problem arises mainly because each bio-sensor collects different parameters with different data rate and alternation. Another source of interference is related to normal patient movement. Proposals in the literature usually assume that the interference can be handled using time multiplexing or by listening...
Many applications in factory and process automation require robust wireless sensor networks (WSNs) for collecting sensor data with sampling and transmission rates up to 100 Hz from battery powered sensor nodes. To establish real-time communication in a star network topology, the LLDN mode of IEEE 802.15.4e amendment was released. We present a demonstration system which applies a recently introduced...
In distributed applications, a group of multiple process are cooperating with each other by exchanging messages in underlying networks. A message sent by each process has to be delivered to every process in a group. In this paper, we discuss a protocol for reliably, efficiently transmitting messages to every operational process in a group. We assume that each process can send messages to only neighboring...
Wireless Sensor Networks (WSNs) often need to operate under strict requirements on energy consumption and be capable of self-adapting to the presence of non-trusted nodes which do not fully cooperate in the packet forwarding operation. In such an environment, the mechanism employed for the calculation of routing paths of minimum cost in terms of the number of transmissions executed for the reliable...
In this paper medical ICT scenarios are considered where a user/patient communicates to a base station with the help of one or more mobile devices in its close proximity. The system model assumes all the wireless devices cooperate in a mobile cloud. First of all, we identify medical ICT scenarios and select the most promising ones where the concept of mobile cloud can be readily exploited. Two cooperative...
To be accepted for use in industrial applications, wireless technologies must offer similar performance in terms of reliability and timeliness as provided by current wired solutions. Wireless channels, introducing time-varying packet error rates, impose a significant challenge to fulfill these requirements. One way to improve reliability in industrial wireless networks is to use relaying, whereas...
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