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Recently, wireless sensor networks (WSNs) have become increasingly available for data-intensive applications such as micro-climate monitoring, precision agriculture, and audio/video surveillance. A key challenge faced by data-intensive WSNs is to transmit the sheer amount of data generated within an application's lifetime to the base station despite the fact that sensor nodes have limited power supplies...
Base station mobility can be exploited to minimise the energy consumption in a wireless sensor network. This paper investigates the impact that base station movement has upon the performance of cluster-based wireless sensor networks. Three types of base station movement are considered: movement influenced by the position of cluster-heads, random movement and movement partially influenced by the position...
Compromised sensor nodes may collude to segregate a specific region of the sensor network preventing event reporting packets in this region from reaching the basestation. Additionally, they can cause skepticism over all data collected. Identifying and segregating such compromised nodes while identifying the type of attack with a certain confidence is critical to the smooth functioning of a sensor...
We investigate the scaling law of throughput capacity of hybrid networks with non-trivial node mobility. By non-trivial mobility, we mean it is strong enough to improve capacity. A general model with heterogeneous nodes and spatial inhomogeneities is adopted. We show in a network, whose physical extension grows at f(n), with n users and k base stations, the per-node capacity is ??(1/f(n)) + ??(k/n)...
In this paper, we discuss a new coastal tide collecting technology which is based on the integration of the CDMA Wireless network and GPS-RTK technology. With this new tide collecting technology, we can get the real-time tide level easily. At the same time, the FFT that is used for tide signal extraction is also discussed. Finally, its accuracy is verified by the experiment.
Mobile elements, which can traverse the deployment area and convey the observed data from static sensor nodes to a base station, have been introduced for energy efficient data collection in wireless sensor networks (WSNs). However, most existing solutions only plan a single path for the mobile element, which may lead to quick energy depletion for the sensor nodes that are far away from the path. In...
Distributed sensor networks are used for asset monitoring within industrial environments. Energy efficient operation of such systems is an important characteristic. Mobile data collectors have been proposed as an approach for reducing energy requirements of data dissemination. Macro level optimisation techniques for selecting the overall best route for data collection exists, but they often oversee...
High capacity mobile broadband access requires a dense infrastructure of base stations. The costs associated with the backhaul transmission for these base stations is often a significant part of the total cost of the access network. It has been proposed to use part of the available spectrum to route data between base stations, so-called in-band relaying or self-backhauling. Although self-backhauling...
We consider a downlink resource allocation problem for two systems or cells each consisting of a base station and multiple mobile stations. Each cell operates on a protected band for exclusive use and a band shared with the other cell. On simultaneous transmission in the shared band, the two systems disturb one another with interference. The strategies of the systems are their choices of power allocations...
Collaborating mobile robots equipped with WiFi transceivers are configured as a mobile ad-hoc network. Algorithms are developed to take advantage of the distributed processing capability inherent to multi-agent systems. The focus of this study will be to determine the optimal amount of communication which allows the robots to share a sufficiently detailed global map, while keeping their processing...
In this paper performance of soft handoff algorithm based on pilot signal strength measurements is studied. It has been observed that the available analytic expressions involve integration in infinite limit. The expressions containing such kind of integrals have been meticulously transformed into finite range equations. In soft handoff, probability of outage, number of base stations (BS) in the active...
Wireless sensor networks have been identified as being useful in a variety of domains to include military sensing and tracking, environment monitoring, patient monitoring and tracking smart environment, etc. When sensor networks are deployed in a hostile environment, security becomes extremely important, as they are prone to different types of malicious attacks. Due to the resource, limitations of...
The problem of server performance in a contemporary, rapidly developed and multi-discipline environment is examined. Multiple requests in a very short time increase the number of connections and push the server to the limit. For autonomous server operations many of the offered services need to be self-managed. A collaborative system involving nodes, base stations (BSs) and servers is developed, as...
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