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How to measure and maintain connectivity is an important issue in ad hoc networks. A special case of such network is Wireless Sensor Networks (WSN), which are often deployed in harsh environments and also susceptible to a number of problems that may negatively affect the connectivity among the nodes. An additional factor that increases the cost of connectivity maintenance in ad hoc networks is when...
This paper presents a multi-hop dynamic moving algorithm to repair the coverage holes, while maintaining the initial topology and connectivity, for the wireless sensor networks. In such environment, the movement of each sensor node is fully distributed and autonomous. The proposed algorithm takes the density measures into consideration for determining which node to move and to what direction and distance...
In mobile wireless sensor networks where sensor nodes are general mobile terminals equipped by vehicles and pedestrians, it is difficult for applications to estimate coverages of sensor nodes due to their mobility. In addition, when a network is sparse, it is also difficult to estimate delivery delays of sensor readings to the sink node(s) because delays depend on both the distribution of nodes and...
This paper presents a cross-platform solution of smartphone-based mobile sink for wireless sensor networks, named uSink. With a cross-platform SD card, named uSD card, any smartphone with SD interface can be empowered with the capability to communicate with wireless sensor nodes. Furthermore, a middleware on mobile phone, named uSinkWare, is also designed to provide a typical mobile sink's functionalities,...
In this paper, we propose a practical range-free localization solution for wireless sensor networks (WSNs). Different from existing localization approaches, the proposed solution is specially designed for an ultra sparse mobile WSNs deployed in coal mine tunnels with linear topography. To obtain more reference information requited for localization with limited anchor nodes, the proposed solution sets...
Recent advancements in wireless communications and electronics have enabled the development of low cost sensor networks. The sensor networks can be used in various applications such as military, health, home. Depending on the application researches are resolving different technical issues. In some applications, a certain segment of the network becomes energy constrained before the remaining network...
Energy management has become one of the main hurdles in the quest for autonomous and reliable Wireless Sensor Networks (WSN). This paper examines the emerging problem of increasing network availability by recharging, replacing or redeploying depleted sensors with the help of mobile entities. When mobility becomes a sensor's attribute and service stations are static, we propose passive vs. pro-active...
Recently, the availability of numerous low-cost robotic units (e.g., Packbot, Robomote, and Khepera) has made it possible to massively deploy mobile sensors in a network and use them in a disposable manner. It has been shown that the controlled mobility offered by sensors can be exploited to improve the energy efficiency of a network. In this paper, we study a new problem called max-data mobile relay...
Wireless Sensor Networks (WSN) are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves can range from small passive micro sensors to larger scale, controllable weather-sensing platforms. In this work, we investigate how the sensor network performs in the...
With an increased adoption of technologies like wireless sensor networks by real-world applications, dynamic network topologies are becoming the rule rather than the exception. Node mobility, however, introduces a range of problems (communication interference, path uncertainty, low quality of service and information loss, etc.) that are not handled well by periodically refreshing state information,...
Underwater sensor networks were recently proposed to support quite a few aquatic applications such as ocean exploration and harbor monitoring. Different from terrestrial WSNs, the underwater sensor networks have many unique characteristics, such as greater propagation delay, higher dynamic topology and sparse node density. These features bring many new challenges to the protocol design of underwater...
The work establishes the asymptotic rate of decay for the probability of node isolation in bounded wireless sensor networks, in the high density regime. In this regime, the exposition reveals the role of the most isolated neighborhoods of the bounding region in exponentially increasing the average probability of isolation. The problem is treated for a large family of random spatial distributions of...
The benefits of using mobile sink to prolong sensor network lifetime have been well recognized. However, few provably theoretical results remain are developed due to the complexity caused by time-dependent network topology. In this work, we investigate the optimum routing strategy for the static sensor network. We further propose a number of motion stratifies for the mobile sink(s) to gather real...
Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves can range from small passive micro-sensors to larger scale, controllable weather-sensing platforms. In order to simulate Wireless Sensor Networks (WSNs), we implemented a simulation...
Object tracking is one of important applications in wireless sensor networks. The key issues involved in object tracking are object detection, target classification, location estimation, and location management. The main theme of this paper is location management. Tree-based location management schemes have been studied extensively. However, the traditional tree-based schemes have two major drawbacks...
Clustering offers a kind of hierarchical organization to provide scalability and basic performance guarantee by partitioning the network into disjoint groups of nodes. In this paper an energy efficient clustering algorithm is proposed under large-scale mobile sensor networks scenario. In the initial cluster formation phase, our proposed scheme features a simple execution process, which has a time...
Key management in Wireless Sensor Networks (WSNs) is a challenging research issue due to the limited resources of sensor nodes. Key management is even more complicated in scalable Mobile Sensor Networks (MSNs) where node mobility poses far more dynamics as compared to static WSNs. The unique characteristics of mobile nodes create a number of nontrivial challenges for security design, given stringent...
Sensor networks are composed of a great number of sensor nodes. Sensor nodes are typically energy restricted and hard to recharge, so reducing energy consumption has recently been a hot focus on wireless sensor network researches. One common approach is to make use of a logical structure, such as a grid, to construct an efficient routing topology for shorten the routing paths. This paper proposed...
A mobile sink is widely considered to facilitate the data collection from energy constrained sensor fields, by having the sink come close to the sensors and conserving precious sensor node energy. The effectiveness of such a data collection approach can be measured in terms of the sensor energy conserved and the time required to collect the sensor data from the field (or, equivalently, the length...
In wireless ad-hoc networks, there are several characteristics different with wired networks. The differences are changing of network topology, limited resources like bandwidth and energy and so on. In these days as the energy issue becomes more important, it is required to research about the efficient resource allocation methods optimized in wireless networks. In the paper, we improve LAR (Location-Aided...
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