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Energy-efficient dynamic resource control problem in buffer-aided hybrid sensor networks is investigated, where each sensor with one buffer is introduced for data storage. The considered problem is formulated as a stochastic optimization problem, which jointly considers the quality-of-service requirements and dynamic characteristics. The Lyapunov optimization theory is applied to transform the intractable...
Neighbor Discovery is one of the emerging research areas in both wireless sensor network and mobile computing applications. The main objective of Neighbor discovery is to acquire information about nearby tags for subsequent communication. Besides, the periodic-signaling mechanism of Neighbor Discovery is suitable for wireless positioning applications. However, the collision problem has been left to...
Content centric network Is a kind of promising architecture of future internet. When implementing the CCN architecture in the energy-constraint wireless scenarios, there is a great challenge that is not considered in the original design of C-CN, that is, the energy saving problem. In this paper, we propose a lightweight energy-aware probabilistic forwarding strategy. Unlike the existing approaches...
The time synchronization of network will encounter a severe challenge due to the proliferation of scale in wireless sensor networks. In order to improve the precision of time synchronization in network, a time synchronization protocol based on frequency skew bid and dynamic topology (FBDT) is designed in the paper as well as realized on Embedded Linux System. To be able to effectively inhibit synchronization...
To build an experimental platform for wireless sensor networks based on 802.11 high rate data transmission protocol, AODV-UU and DSR-UU high rate routing protocols are implemented on the Smart210 development board with embedded Linux operating systems in this paper. In a real static environment, the average end to end delay, packet loss rate and throughput of the network system are tested and compared...
Node flip ambiguity is a key problem that needs to be addressed for the range-based node localization in wireless sensor networks. A Robust Node Localization Method (RNLM) is proposed in this paper. It is a two phase methods. In the first phase, the orthogonal projection detection method is adopted to detect the unknown nodes needed to be positioned. For the unknown nodes that will not occur flip...
Lifetime of wireless sensor nodes is a big challenge in bridge structural monitoring as these nodes may be deployed inside the bridges. In this situation, it is infeasible to replace batteries or harvest solar and wind energy. To prolong lifetime, vibration energy begins to be utilized to replenish energy for sensor nodes. In this study, a vibration energy harvester based on Micro Fiber Composite...
Node flip ambiguity is a key problem that needs to be addressed for range-based node localization in wireless sensor networks. In this paper we have implemented robustness analysis for three-dimensional node localization in wireless sensor networks. A robustness criterion to detect flip ambiguity for range-based three-dimensional nodes localization is proposed. We have proposed that flip ambiguity...
Rapid increase of elderly population in the world is motivating innovative technologies for healthcare services that are both high-quality and cost-effective. Wireless sensor networks (WSNs) based smart home for assisted living is one of the most prosperous solutions to this area, since it removes the requirement of deploying wired devices and is easy to be implemented in existing home environments...
Power consumption is one of the most critical challenges in wireless sensor networks, as sensor nodes are powered by batteries in most situations. Wireless communication is the main source of power consumption in a sensor node. Many energy aware protocols and algorithms have been proposed in the past few years. The basic idea of these methods is to reduce the data that nodes exchange and the time...
To detect a node flip ambiguity in range-based wireless network node localization, Wang et al. have proved that the flip ambiguity detection is equal to whether there is a straight line intersecting with all range error circles of reference node, which is called the existence of intersecting line (EIL) problem. To solve the EIL problem under equal radii, a convex hull algorithm proposed by Wang et...
In this paper, we propose an adaptive resource discovery method in heterogeneous wireless application networks. The adaptive method uses either centralized mode or flooding mode to discover available resources according to different network status. The proposed adaptive method is used to reduce energy consumption in resource discovery process. We establish theoretical energy model for both modes....
For wireless sensor network applications, such as Structural Health Monitoring (SHM), data traffic adaptive becomes more and more important for Medium Access Control (MAC) protocol design. In this work, we present a new hybrid MAC protocol. This protocol is able to adapt for both low and high traffic load. For better energy efficiency and network scalability, we use improved Carrier Sense Multiple...
A reliable data collection protocol for structural health monitoring (SHM) is presented. This application is deployed on Ronghu Bridge in the city of Wuxi, Jiangsu Province, China. The system monitors seven types of sensor (vibration, strain, tension, temperature, bridge deck settlement, bridge tower tilt, wind speed and direction) in real time. Since radio transmission consume most part of the node...
Radio frequency identification (RFID) has become more popular and used ubiquitously in various applications nowadays. They are also commonly found in close proximity to human body in everyday life. There has been growing concerns over health issues caused by the widely spread radio technologies which might be hazardous if operated in close proximity of human beings continuously. However, in our novel...
Wireless intra-aircraft communication is expected to be the enabler for more flexible avionic systems and the reduction of weight and cost in system installations. An alternative to the usage of a dedicated frequency band for wireless intra-aircraft avionics could be the usage of a virtually unregulated ISM band. Cognitive radio techniques could be used to increase system robustness in the likely...
Cable tension force is one of the most important criteria for assessing the work condition of a cable-stayed bridge. As a result, it is necessary to be monitored during operation. Rapid development of wireless sensor network (WSN) technology makes it possible to realize cable tension monitoring conveniently. In this paper, a wireless sensor network based monitoring system was proposed for cable tension...
This paper presents a hybrid sensor network with both fixed nodes and mobile nodes for monitoring and protecting Milu Deer, a specific kind of rare animals in China. Our goal is to provide unprecedented fine-grained environmental and individual data for zoologists and explore potential problems in hybrid sensor networks. Total 116 nodes have been deployed up to now, which consists of 30 mobile nodes...
The Mote architecture is the most popular platform used in wireless sensor network applications. In this architecture, microcontroller is responsible for all jobs, such as scheduling, sampling, computing, and communication. In the past one year, two practical applications: bridge structural health monitoring system and rare animal monitoring system are developed and deployed in Wuxi and Beijing, China...
In this paper, we deal with possible data transmission congestion on the sink node in wireless sensor networks (WSNs). We consider a scenario in which all the sensor nodes have a certain amount of storage space and acquire data from the surroundings at heterogeneous speed. Because receiving bandwidth of the sink node is limited, a proper bandwidth allocation mechanism should be implemented to avoid...
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