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When mobile sensors are initially deployed, some sensors may be located far away from the region of interest and due to the sensor's limited sensing of range, some sensors may not be able to participate in the coverage task. This paper proposes a new algorithm on the coverage problem for mobile sensor networks which guarantees all sensors to participate in the coverage task. The algorithm is a combination...
A new scheme that serves to find a routing path for Wireless Sensor Networks (WSNs), with a view to facilitate an increase in the network life time is proposed in this paper. It envisages the network to be in the form of clusters and develops an algorithm for transfer of information within the nodes and to the remote Base Station (BS). The approach involves the use of Ad-hoc On Demand Distance Vector...
This paper studies mobility strategies to control positions of mobile robots in a mobile sensor network in order to maximize lifetime of the network. With communication and mobility energy costs modeled, the problem is formulated into a nonlinear non-convex optimization problem, then reformulated into a convex optimization problem. The separable property of the system is then exploited by Lagrangian...
In wireless sensor networks, many studies on data dissemination to individual mobile sinks traditionally rely on a strategy that consists of a virtual infrastructure to serve current location of the mobile sinks and a per-sink foot-print chaining mechanism to support local mobility after location update. To adapt the strategy for supporting mobile sink groups, it may be simply considered to exploit...
Node failures in Wireless Sensor Networks composed by static sensor nodes are common due to the nature of the sensor devices and the usually harsh environments in which they are deployed. Node failures can diminish the performance of the network as a whole, thus affecting its functionality in delivering the desired services. For instance, significant regions can become uncovered due to failure of...
Web Service technologies are state of the art in current enterprise distributed applications. To integrate highly resource-constrained devices, such as sensor nodes, into enterprise applications via Web Services, gateways are commonly used. Our aim was to investigate the intermediate, homogeneous communication between enterprise applications and highly resource-constrained devices. We therefore present...
In this paper, a kind of novel alarming access scheme is proposed for the pervasive and mobile healthcare application. This algorithm makes use of the wasted bandwidth in Contention Free Period in order to reduce transmission latency of alarming packets. The performance evaluation shows that this scheme can reduce the delay time of the alarming frame, especially in handling the time-critical problem...
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...
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. In this paper, we investigate how the sensor network performs in the case when three events move with special movement path. We compare the simulation results for three cases: stationary, random and simple...
Although advance network planning and dense node deployment, wireless sensor networks (WSNs) may achieve the required performance, it still face the fundamental challenge of meeting stringent power and time requirements using nodes with limited sensing capacities. To better cope with the power consumption problem, mobile sensor nodes can be introduced to dynamically reconfigure the sensor network...
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...
In this paper, a novel secure routing protocol is proposed for wireless sensor networks in which sensor nodes as well as the base station are mobile. The protocol achieves security property through symmetric key cryptography and threshold key cryptography. An analysis of the security strengths of the protocol is presented. Simulation results show the throughput of the proposed protocol and a comparison...
The emergence of Wireless Sensor Networks brought many benefits in different application domains such as collaborative tasks, lower costs, equipment's autonomy and higher tolerance to failures. These advantages made the number of applications that use this kind of network grow in the past few years. Meanwhile, the possibility of employing these systems to trace the movement of an object, which can...
Rumor Routing is one of the routing algorithm categories in wireless sensor networks which is well extended and optimized in the recent years. Common principal ideas in all rumor routing algorithms are conjunction of query-agents with the traversed path of event information propagator agents in the network. In this paper we propose a new method to reduce the number of routing agents to consequently...
In this paper, a ZigBee-based sensor network is realized and evaluations are carried out in order to clarify the fundamental performance of this sensor network. Life recording and management system is introduced as an example of ZigBee-based sensor networks, and the system is introduced into mobile WiMAX network in Azumino city in order to solve some medical problems in local cities. The following...
Wireless communication in a car has several advantages, given that demanded safety and real-time requirements are fulfilled. This paper presents a wireless MAC protocol designed for the needs of automotive and industrial applications. The proposed MAC protocol provides special support for network traffic prioritization in order to guarantee worst-case message delays for a set of high-prioritized nodes...
Securing Network Program update is essential for many crucial military applications. Present Network Programming protocols proposed by Hailun Tan et al. provides confidentiality and authentication with high computational effort and power consumption. We have developed a confidential network program update protocol for clustered wireless sensor networks. Our scheme has two phases, key computation phase...
This paper discusses a joining method of the mobile nodes in PANs. The mobile nodes repeat frequently a joining association at the boundary points. A joining method using hysteresis features in PANs is proposed for solving the problem. For performance analysis, the joining period of the mobile nodes in PANs is investigated and analyzed using the proposed method.
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,...
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