In this paper we focus on evaluating topk queries in an energyefficient manner such that the network lifetime is maximized. Wireless sensor networks have been widely used in civilian and military applications. Random and directed walkbased topk queries in wireless. Localized monitoring of knn queries in wireless sensor networks. Ieee transactions on knowledge and data engineering 19 7, 962. Privacypreserving topk query in twotiered wireless. A spatiotemporal approach to secure range queries in tiered sensor networks pdf jing shi, rui zhang, and yanchao zhang, ieee transactions on wireless communications, vol.
A query of this type continuously returns a list of k ordered nodes with the highest or lowest sensor readings. It is likely that they will be in use for a long time, generating a large amount of data. The algorithm does the query exactly and meanwhile uses conic section. In real world, these wearable sensor systems usually form a wireless sensor network to transfer collected data. The correctness of the topk result is ensured if all sensor. Topk monitoring queries are useful in many wireless sensor network applications. In vital status monitoring applications, patients wear sensors that supervise their. To process these queries, a wellknown approach is to install a. However, due to the battery energy exhausted, sensor nodes become invalid and get out of usage, hence researching on energy efficient algorithms plays a significant role in the area of sensor networks. On maximizing reliability of lifetime constrained data. Abstracttopk monitoring is important to many wireless sensor applications.
Abstracttoday, we can witness wireless sensor networks. Enroute data filtering technique for maximizing wireless sensor. Efficient query evaluation of probabilistic topk queries in wireless sensor networks p. International conference on acoustics, speech, and signal processing, 2001. Efficient data access in mobile cloud computing, siva naga venkata chaitanya vemulapalli.
Wireless sensor networks wsn the many tiny principle. Continuous distributed topk monitoring over highspeed. Processing topk monitoring queries in wireless sensor. It is responsible for transferring the received results to the authority on topk query request from them. State key laboratory for novel software technology, nanjing university, nanjing, china nju. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Topk query is one of very popular queries in wireless sensor networks, which is to find the k nodes with the highest values reading among the sensor nodes. Request pdf localized monitoring of knn queries in wireless sensor. Rui zhang, yanchao zhang, and yuguang fang, acm wireless networks, vol. A method of data aggregation for wearable sensor systems.
Efficient continuous skyline query processing in wireless sensor. The basic idea is to install a filter at each sensor node to. Gregory 4, 1 school of electrical and computer engineering, rmit university, melbourne, vic 3000, australia 2 melbourne institute of technology, melbourne vic 3000, australia 3 department of computer science. Wireless sensor networks have tremendous value for eventbased applications. This paper exploits the semantics of topk query and proposes an energyefficient monitoring approach called fila.
Optimizing lifetime for continuous data aggregation with precision guarantees in wireless sensor networks. In wireless sensor networks, filterbased topk query approaches are the stateoftheart solutions and have been extensively researched in the literature, however, they are very sensitive to the network parameters, including the size of the network, dynamics of the sensors readings and declines in the overall range of all the readings. On temporal and frequency responses of smartphone accelerometers for explosives detection, srinivas chakravarthi thandu. In this top k query response time is calculated by filtering technique. Topk monitoring in wireless sensor networks department of. Topk queries, sensor networks, distributed systems 1. Typical solutions rely on coordinated roottonodes and nodestoroot messages and on maintaining filters at the nodes, aiming at suppressing unnecessary messages, hence saving energy and furthering the network s lifetime. Maximizing lifetime for the shortest path aggregation tree. We present a novel methodology to construct an optimal query containing fewer sensory attributes as. Amount of sensory data drawn across wsns by a query can significantly impact wsns power consumption and its lifetime, since wsns are battery operated. Topk query processing has long been an important task in various research domains where the k highest or lowest data points are. Younis, a survey on routing protocols for wire less sensor. Instrumenting the world with wireless sensor networks.
A wireless sensor networks monitoring device based on. Aimed at the topk query problems in the wireless sensor networks wsn where enquirers try to seek the k highest or shortest reported values of the source nodes, using privacy protection technology, we present an exact topk query algorithm based on filter and data distribution table shorted for etqfd. Location monitoring systems are used to detect human activities and provide monitoring services, e. Monitoring topk query in wireless sensor networks core. In the process of topk queries, system usually calculates the property. In wireless sensor networks, filterbased top query approaches are the stateoftheart solutions and have been extensively researched in the literature, however, they are very sensitive to the network parameters, including the size of the network, dynamics of the sensors readings and declines in the overall range of all the readings. Introduction the advances in wireless communications along with the exponential growth of transistors per integrated circuit lead to a rapid evolution of wireless sensor devices wsds, permission. Monitoring topk query in wireless sensor networks citeseerx.
For ease of exposition, consider a set of sensors acquiring data from their environment at a given time. This paper exploits the semantics of topk query and proposes a novel energyefcient monitoring approach, called fila. Topk monitoring in wireless sensor networks abstract. As another example, consider wireless sensor networks. Localized monitoring of k nn queries in wireless sensor. Since topk query is one of the most frequently used operators in many instance of large scale wireless sensor networks, we implemented two well. Wireless sensor networks wsns have been deployed for various applications such as military target tracking, environment sensing, and health monitoring, etc in this paper, we consider a two. On maximizing reliability of lifetime constrained data aggregation tree in wireless sensor networks mengfan shan. Extending network lifetime for precisionconstrained data aggregation in wireless sensor networks. Efficient query evaluation of probabilistic topk queries. Research article an exact top k query algorithm with.
Our aim is to provide wsn designers with a topdown survey that offers a. Since the sensor node is energy constrained, how to construct a good tree to prolong the. Topk wireless sensor network abstract topk monitoring queries are useful in many wireless sensor network applications. K nearest neighbors knn 15 is one of the top 10 data. Journal of actuator networks sensor and article enhanced distributed dynamic skyline query for wireless sensor networks khandakar ahmed 1,2,3, nazmus s. Evaluating topk queries in distributed networks has been extensively studied in the literature for example, 4, 5, wu et al topk monitoring in wireless sensor networks 963 1. Secure topk query to variably encrypted signature in. Wireless sensor networks that support topk queries can be used to not only monitor the data generated. Minji wu and jianliang xu were supported in part by research grants council of hong kong under project no. Enhanced distributed dynamic skyline query for wireless. Random and directed walkbased top queries in wireless. An energyefficient routing algorithm based on bezier. In this work, a random walkbased topk query approach.
Topk query evaluation in sensor networks 157 points with largest values to the base station, where a point is referred to as the sensed value and the id of its generator sensor. Distributed adaptive topk monitoring in wireless sensor. Topk query is to find k results with highest values according to the rank of a userdefined function. Conventional queries, such as topk queries 1, and nearest neighbor queries 2. Aimed at the top k query problems in the wireless sensor networks wsn where enquirers try to seek the k highest or shortest reported values of the source nodes, using privacy protection technology, we present an exact top k query algorithm based on. Aggregate location monitoring for wireless sensor networks.
A priorityaware multidimensional topk query processing. These application requirements call for a key function to prioritize only a few first attentive sites, that is an efficient processing of the continuous multidimensional topk queries in wireless sensor networks. In this paper, we consider an aggregate location monitoring system where wireless sensor nodes are counting sensors that are only capable of detecting the number of objects within their sensing areas. In the proposed algorithm, whether a sensor is to forward the collected data to the base station is determined in accordance with the calculation of a proposed local function, which is the. Exploiting local node cache in topk queries within. Pure and applied sciences, open university of cyprus, p. Computer science masters theses computer science theses. A methodology to optimize query in wireless sensor. This paper exploits the semantics of topk query and proposes a novel energyefficient monitoring approach, called fila. Topk monitoring in wireless sensor networks article pdf available in ieee transactions on knowledge and data engineering 197. However, how to energyefciently answer topk queries is a great challenge to wireless sen sor networks.
Data compression, which deals with the correlation between data such that the number of reports is reduced, is another method for data gathering 5. An exact topk query algorithm with privacy protection in. Wearable sensor systems consist of devices with one or many sensor nodes. Introduction sensor networks will be deployed in buildings, cars, and the environment, for monitoring health, tra. In this work, a random walkbased top query approach.
Top k query evaluation in sensor networks with the. Our framework, coined kspot, utilizes a novel topk query processing algorithm we developed, in conjunction with the concept of innetwork views, in order to minimize the cost of query execution. In such applications, sensor nodes transmit the data continuously for a specific time period to the storage nodes. Data mining, histogram, outlier detection, wireless sensor networks 1. View pdf download pdf abstract storage nodes are predictable to be located as an intermediate tier of huge scale sensor networks for caching the composed sensor readings and responding to queries with benefits of influence and storage reduction for standard sensors. Most critical sensor readings topk monitoring in environment monitoring system are important to many wireless sensor applications.
There is a wellknown approach called fila to process this kind of queries. For simplicity, the overhead for initial data collection and filter setting is not shown here, but is counted in our experiments. Distributed topk monitoring proceedings of the 2003 acm. Here we focus on addressing the communication overhead which is critical for wireless sensor networks and their applications. In wireless sensor networks wsn, a query is commonly used for collecting periodical data from the objects under monitoring. Each sensor node is usually equipped with a lowspeed microprocessor, limited memory, and a radio transceiver and receiver 1,2,3. Primarily designed for monitoring purposes, many sensor applications require continuous collection and processing of sensed data. Citeseerx topk monitoring in wireless sensor networks. Abstractin many applications of wireless sensor networks, a sensor node senses the environment to get data and delivers them to the sink via a single hop or multihop path. Topk with diversitym data retrieval in wireless sensor networks, kiran kumar puram. Topk monitoring is important to many wireless sensor applications. Their combined citations are counted only for the first article.
The basic idea is to install a lter at each sensor node to suppress unnecessary sensor updates. Effectively monitoring the k most important events. Which reduces top k query response time, unnecessary number of message transmission, packet loss. Thus, a topk query may be issued to continuously monitor the sensor nodes with the least residual. Many systems use a tree rooted at the sink as the underlying routing structure. Dataaware topk monitoring in wireless sensor networks. In monitoring highspeed rail data flow with the massive data transmission, topk is a very important query algorithm, which returns k most important results according to the sorting function in the potential data space. To process these queries, a wellknown approach is to install a filter at each sensor node to avoid unnecessary transmissions of sensor readings. Topk queries are a popular type of query in wireless sensor networks. The basic idea is to install a filter at each sensor node to suppress unnecessary sensor updates.
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