cidr2003-sensor - Query Processing for Sensor Networks Yong...

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Unformatted text preview: Query Processing for Sensor Networks Yong Yao Johannes Gehrke Department of Computer Science Cornell University Ithaca, NY 14850 { yao,johannes } Abstract Hardware for sensor nodes that combine phys- ical sensors, actuators, embedded processors, and communication components has advanced significantly over the last decade, and made the large-scale deployment of such sensors a reality. Applications range from monitoring applications such as inventory maintenance over health care to military applications. In this paper, we evaluate the design of a query layer for sensor networks. The query layer accepts queries in a declarative language that are then optimized to generate efficient query execution plans with in-network pro- cessing which can significantly reduce resource requirements. We examine the main architec- tural components of such a query layer, con- centrating on in-network aggregation, interac- tion of in-network aggregation with the wire- less routing protocol, and distributed query processing. Initial simulation experiments with the ns-2 network simulator show the tradeoffs of our system. 1 Introduction Recent developments in hardware have enabled the widespread deployment of sensor networks consisting of small sensor nodes with sensing, computation, and communication capabilities. Already today networked sensors measuring only a few cubic inches can be pur- chased commercially, and Moores law tells us that we will soon see components that measure 1/4 of a cubic inch, running an embedded version of a stan- dard operating system, such as an embedded version Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment. Proceedings of the 2003 CIDR Conference of Linux or Windows CE .NET [2, 1]. Figure 1 shows a Berkeley MICA Mote[13], one of the platforms avail- able commercially today, and Figure 2 shows its hard- ware characteristics. 1 Sensor nodes come in a variety of hardware configurations, from nodes connected to the local LAN attached to permanent power sources to nodes communicating via wireless multi-hop RF radio powered by small batteries, the types of sensor nodes considered in this paper. Such sensor nodes have the following resource constraints: Communication. The wireless network con- necting the sensor nodes provides usually only a very limited quality of service, has latency with high variance, limited bandwidth, and frequently drops packets. [28]....
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cidr2003-sensor - Query Processing for Sensor Networks Yong...

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