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Range-free localization approaches are cost-effective for mobile sensor networks (because no additional hardware support is required). However, existing range-free localization approaches for mobile sensor networks suffer from either sparse anchor node problem or high communication cost. Due to economic considerations, mobile sensor networks typically have sparse anchor nodes which makes most range-free...
It is well-known that localization in Wireless Sensor Networks (WSNs) is costly. However, after deploying and localizing the sensors, sensors may be moved from their original location by the depredation of the enemy or natural phenomena. In such cases, moved sensors return the inconsistent information with their incorrect location to sink or spread the incorrect location to the network resulted in...
In wireless sensor networks, an important challenge often faced in geographic greedy forwarding is the local minimum phenomenon which is caused by holes. For solving this problem, most hole-avoiding protocols route packets along the perimeter of holes or forbidden regions. Thus, sensor nodes on the perimeter of holes and forbidden regions exhaust their energy faster than others, which enlarge the...
Wireless Sensor Networks (WSNs) is composed of sinks and sensor nodes, which can monitor large-scale environment. The sensor nodes have several advantages, such as low cost, small size, and capability of mobility, and they can do data sensing, data processing and wireless communication. However, the greatest challenge is the constraints of energy. The most critical issue is how to minimize the energy...
In mobile wireless sensor networks, it is important to understand the moving pattern of sensor nodes. There are a lot of application that need sensors nearby to co-work, such as data centric applications. Thus, knowing the co-moving nodes will be helpful to these applications. In this paper, we propose a co-moving sensor nodes detection algorithm based on virtual coordinate system. We use the geometric...
In traditional wireless sensor networks, the sensed data will be forwarded to sink by multi-hop, so that the hot spot problem will happen on the nodes near the sink. The power consumption of these nodes is higher than others, these nodes will be dead sooner. It leads to the network lifetime decreasing. We proposed a data transmission mechanism using mobile sink to solve this problem. We use two threshold...
How to save energy for target tracking in WSNs is an important issue. The basic idea of energy-saving method is using sleep mechanism. However, if nodes enter sleep state too much, targets may lose easily from the sleeping nodes. It is high consuming the energy to find back these losing targets. Thus, it would notice accuracy of tracing targets when saving energy. In this proposal, it offers a scheme...
Wireless Sensor Networks (WSNs) can be widely utilized in many applications, especially in environmental surveillance. However, there exists some holes within the WSNs caused by some factors, such as non-uniform deployment of sensor nodes, some depletion of energy from sensor nodes, the destruction from external forces and the existences of physical obstacles, such as mountains and lakes. These holes...
The relate technologies of Wireless Sensor Networks (WSNs) have become an essential research in the future. The sensor nodes of WSNs can only use limited energy like battery. When the energy has been exhausted, WSNs cannot work anymore. In order to extend the lifetime of WSNs, the management of the sensors¡¦ energy is an important issue. The Sleep Schedule addressed on ¡§A Power Control Mechanism...
In wireless sensor networks, sensor nodes will transmit the sensing data to sink through multi-hop, this kind of transmission will cause the hotspot problem, and also the effectiveness of sensing data will be decreased in larger network environment. To solve all these problems, we propose an instantaneous data dissemination mechanism which can use multiple mobile sinks to collect the sensing data...
Wireless sensor networks are widely used for applications such as environmental monitoring, airport safety, health care, etc. For user authentication, in 2009, Das proposed a two-factor user authentication scheme in wireless sensor networks. They claimed that this scheme provided efficiency, strong security, and user anonymity property. However, we find that Das's scheme is still vulnerable to masquerade...
The sensor node in Wireless Sensor Network is with the characteristics of low power consumption, but the sensor node can't be rechargeable. Therefore, the consumed of power is limited. How to effectively control the power of the sensor node and extend the life time of the whole network become a very important issue. This paper sets forth "The Optimal Sleep Control For Wireless Sensor Networks...
In wireless sensor networks, ??holes?? are hardly to know its location and avoid either because of various actual geographical environments. A hole can be dynamically formed due to unbalanced deployment, failure or power exhaustion of sensors, animus interference, or physical barriers such as buildings or mountains. Hence, we hope to propose the RNG Hole Avoiding Routing protocol, RNGHAR which can...
Wireless sensor networks (WSNs) is composed of sink and many sensor nodes. It has the great scope to monitor environment and the characteristics of wireless communications. Relatively, the advantages of sensor node bring themselves some restrictions. The greatest challenge among those is the constraints on energy. The most critical issue is how to minimize the energy consumption for keeping target...
Due to the property of sensor devices, the sensor networks may easily be compromised by attackers who modify messages or provide misleading information to other sensor nodes. On the other hand, nodes in a sensor network may be lost because of power exhaustion or malicious attacks. Therefore, new node deployment is necessary. Based on the one-way hash function, this paper will present a new dynamic...
Sensor networks are widely used for applications such as environmental monitoring, airports safety, health care, etc. Owing to the property of sensor devices, the sensor networks are easily compromised by an attacker who sends forged or modified messages. Therefore, the security is very important in the sensor networks. However, the traditional asymmetric cryptography such as Diffie-Hellman key agreement...
Since the mass development of the wireless network, the advancement in wireless communications and micro-electronics element promote the development of wireless sensor networks (WSNs). The sensor nodes of WSNs have the following abilities such as: sensing, computation, and wireless communication capabilities. Hence, WSNs can be used for various application domains. Recently, the localization issue...
The energy efficiency is a substantial key design issues in such networks. An efficient routing protocol is critical to prolong the life of sensor nodes. This work presents a hierarchical multiple-choice routing path protocol (HMRP) for wireless sensor networks. According to HMRP, the wireless sensor network is initially constructed as a layered network. Based on the layered network, sensor nodes...
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