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The scour is one of the major causes for bridge failure. Scour failure occurs suddenly without prior warning or sign of distress to the bridge. However, there are many challenges to monitor the processes of hydraulic scour, such as measuring equipments are essentially critical, especially during the floods. This paper presents an in-situ scour monitoring system by using the novel mobile wireless technology...
Pervasive computing is a rapidly developing area of Information and Communications Technology (ICT). It refers to the increasing integration of ICT into people's lives and environments, made possible by the convergence of advanced electronic - and particularly, wireless - technologies and the Internet. Wireless technologies are expected to connect various devices in many potential applications, from...
Contention among multiple nearby WLANs in urban areas may cause severe TCP unfairness, where some TCP flows can achieve very high throughput at the expense of starving others. This unfairness results from the fact that different physical nodes conveying TCP flows at a wireless bottleneck may have different channel observations and consequently they may provide inconsistent feedbacks to the TCP sources...
This paper presents a method for supporting wireless media streaming using a cache that is distributed across the mobile devices in the network. The performance of this scheme is compared to traditional institutional server (IS) caching on a network with a bandwidth constrained wireless backhaul. In addition to traditional caching hit ratio metrics, the paper studies how caching affects the call drop...
Wireless sensor network (WSN) is the connection between the physical world and mankind. Particularly, environmental monitoring and devices automatic control of intelligent building based on wireless sensor network is considered as one of the most crucial applications. It can perceive many kinds of environmental parameters and feedback control information to some devices to provide comfortable environment...
Adaptive packet sizing techniques are widely used in wireless communication to enhance the link reliability. Typically, shorter packets are less error prone than longer packets. Adaptive packet size technique is used in IEEE 802.11 wireless network to enhance link reliability and packet delivery ratio. In this work, we adopt this technique to work in IEEE 802.15.4 based networks, and specifically...
Location fingerprinting for outdoor areas using existing wireless local area network infrastructure is growing rapidly in importance and gains commercial interests in location-based services. The most challenge in outdoor fingerprint positioning is the fluctuation of received signal strength (RSS). In the paper, we propose a micro-cell-based radio map construction method targeted to deal with the...
This paper deals with load management in flexible industrial networks, characterized by a hybrid wired/wireless architecture and mobile wireless nodes. Our target scenario is an industrial network, in which data is exchanged between sensors and actuators running on the wireless side and a wired automation network. As many unpredictable elements affect the performance of wireless data transmission,...
One of the most promising technologies for tomorrow's sensor networks are wireless approaches. Mesh networks using ad-hoc concepts are very popular, but have the drawback that real-time constraints cannot easily be fulfilled, because data transmission times are not fully deterministic. On the other hand, infrastructure networks based on central access points are limited in their range. For time-critical...
This is a research with the main objective to investigate the error rate in the location estimation of a wireless node, by considering the error rate of different terrains/clutters. Radio waves behave differently in different terrains. When the transmitted signal propagates through different terrains, the terrain impairments affect the transmitted signal. Because of the noise addition, the received...
Performance of a deployed Wireless Sensor Network (WSN) is greatly influenced by the interference it is subject to during operation. Degradation happens due to interference resulting in packet drops, retransmissions, link instability and inconsistent protocol behavior. We have conducted experiments that highlight the fact that interference caused by WiFi and co-channel contention significantly degrades...
This paper first introduces a heterogeneous multi-layer networking architecture for the mobile cyber-physical systems (CPS). In the network, a CPS terminal can adaptively access to a wireless local-area access network (WLAN) gateway or a wireless wide-area access network (WWAN) base station (BS) according to the channel conditions. The heterogeneous CPS wireless network schedules the CPS terminal...
Wireless backhaul has been received much attention as an enabler of future broadband mobile communication systems because it can reduce deployment cost of pico-cells, an essential part of high capacity system. A high performance network in terms of high throughput, low average delay and low packet loss rate, is highly appreciated to sustain the increasing proliferation in multimedia transmissions...
Both research and practice have revealed that sensor devices running the 802.15.4 on their MAC layer may be competing for wireless communication on the 2.4 GHz ISM band with Wi-Fi, Bluetooth and other proprietary devices. Building upon a SunSPOT development platform, we evaluate the impact of channel hopping on interference mitigation in the 2.4 GHz ISM band and propose a channel hopping model that...
In this paper we propose a novel distributive algorithm for WLAN localization in which some nodes know their positions and others determine their position by measuring distances to these known nodes and neighboring nodes. Localization is a process by which physical positions of the nodes are determined. Localization where positions are reconstructed given measured distances is a non-convex optimization...
In the field of information collection process, we not only pay attention to the environmental temperature, humidity, light, etc, but also hope to accurately locate acquisition nodes. Especially in the study of soil pH and soil nutrients, the soil pH is not uniformly distributed in different regions. In this paper, we constructed a wireless positioning sensor network based on the Zigbee technology,...
The “Internet of Things” infrastructure will be strongly integrated with the environment, and its integration with the enterprise systems will not only further blur the line between business IT systems and the real world. To contribute to the secure development of IOT, the research mainly focuses on the key trust control technologies in IOT, including heterogeneous network model, trust routing, and...
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