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In this paper, a novel wireless relay algorithm is proposed to support newly appeared data flow. The relay node is integrated with new data forwarding capability. The most widely applied wireless sensor network is introduced with IEEE 802.15.4 which is a common lower layer of WIA and ZigBee. The bandwidth is reserved through the broadcasting beacon and direct diffusion approach. All the data flow...
The conventional methods of improving the performance of wireless sensor network focus on proposed algorithm mechanism to increase the packet delivery ratio, reduce the delay and so on. In this paper, firstly we propose an adaptive sleep scheduled scheme to reduce the energy consumption of the whole network. Based on this, we introduce weight w to measure the importance of data. We assume that the...
As a conventional MAC control protocol for wireless networks, IEEE 802.11 DCF hasn't taken account into the requirement, which TCP/UDP hybrid stream access needs for MAC frame length. The TCP/UDP hybrid stream's transmission delay would increase significantly, that always generate failure of TCP stream transmitting. This paper proposes an improved IEEE 802.11 DCF protocol and theory model based on...
Trend of accelerated aging society increases need of care for the aged at home. To fit this need, we designed the continuous body posture monitoring system based on wireless sensor networks. The hardware platform is made up of anchor nodes, the central control node and wireless sensor nodes which include the three axis low-g accelerometer MMA7260, 2-axis magnetic sensor HMC5883L and CC2431 System-on-Chip...
This thesis introduces the architectures and characteristics of wireless sensor networks. According to their features and the application scope of each method, it puts forward a new whole design scheme, which adopts software structure based on .net micro framework to accelerate wireless sensor networks development and simplify system complexity. Concepts verification and prototypes system design are...
This paper presents a new method for odor source localization using a Wireless Sensor Network (WSN) by means of collaboration with a mobile robot. The method has two steps: an initial estimation of the position of odor-source is obtained centrally by one robot and is based on particle filtering. It does not require any prior information about the position of the nodes. In the second stage, the nodes...
Mobile sensor networks comprise of mobile and static sensor nodes set up for the purpose of collaboratively performing tasks like sensing a phenomenon or monitoring a region. Sensor deployment is an important problem in mobile wireless sensor networks, which affects the performance and lifetime of the networks. This paper presents a distributed deployment algorithm for mobile sensors. Our algorithm...
Knowledge of topology in wireless sensor networks is significant for network management and maintenance. In this paper, a conditional probability of data loss theorem is proposed for wireless sensor networks based on the data aggregation paradigm.al probability of data loss theorem. It reveals the relationship between conditional probabilities of sensor data loss given different conditions. Based...
Location information is very crucial for the sensing data in wireless sensor networks (WSN). But localization precision and cost are two challenging problems for practical localization applications. We proposed a novel algorithm to tackle these challenges. Our collaborative sparse-anchored scheme, CSA, utilizes multi-hop anchors collaboration to improve localization accuracy and ratio, especially...
In recent years, a variety of new data dissemination protocols have been developed specifically for wireless sensor networks (WSN), but no realistic performance comparison between them has been attempted. This paper reports on the results of a simulation comparison of three available data dissemination protocols for wireless sensor networks, using Ns simulations. Our performance study provides useful...
We consider the problem of reliable data dissemination in the context of wireless sensor networks. For some application scenarios, reliable data dissemination to all nodes is necessary for propagating code updates, queries, and other sensitive information in wireless sensor networks. Epidemic algorithms are a natural approach for reliable distribution of information in such ad hoc, decentralized,...
Wireless Sensor Networks have been identified as one of the most important technologies for the 21st century, which have already enabled numerous embedded wireless applications. In this paper, we introduce a design system of the wireless sensor networks with multi-agent systems for lighting control of intelligent building. The system of intelligent buildings control provides a practical application...
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