4 GHz band), are designed to be simpler and more economical than the modules from other candidate standards for WPANs (such as Bluetooth). selleck chem Inhibitors,Modulators,Libraries Additionally, the standard also contemplates the possibility of real-time guarantees so it can be also put into operation in scenarios where real-time flows (e.g., voice or the signal from a biosensor such as an electrocardiogram) are expected to be transmitted. As a consequence, in spite of the immature state of ZigBee technology, it has become an appealing alternative to support a wide set of services, particularly for low consume domotic sensor networks but also for other applications ranging from medical telemonitoring to industrial plant-process control.The main attractiveness and also the main challenge of IEEE 802.15.
4/ZigBee is its potentiality to set up self-organizing Inhibitors,Modulators,Libraries networks capable of adapting to diverse topologies, node connectivity and traffic conditions. Inhibitors,Modulators,Libraries Typical applications of 802.15.4/ZigBee usually consist of tens or hundreds of simple battery-powered sensor nodes (or ��motes��) which periodically (or sporadically) transmit their sensed data to one or several data sinks (acting as the ZigBee Coordinator or intermediate routers in the way to the Coordinator).ZigBee/802.15.4 technology was conceived to minimize the power consumption of these motes. For this purpose, the activity of the motes must be reduced up to a minimum so they can remain most of the time in a low-power (sleep) state. Therefore, a mote just has to ��wake up�� (to be active) in order to sense and transmit (or receive) the data for a small fraction of time.
The general objective is to maximize the lifetime of the battery in the motes and consequently the lifetime of the sensor network itself.In order to predict the battery duration of the devices in a practical implementation of a 802.15.4/ZigBee network, we must characterize Inhibitors,Modulators,Libraries the activity cycles of the motes as well as the current which is drained from the battery during the different operations imposed by the dynamics Anacetrapib of 802.15.4 communications, especially those which imply the activation of the radio transceiver (main source of battery consumption in the motes).In the literature there are studies that model the power consumed by devices which utilize proprietary stacks or just the physical layer of 802.15.4 (see, for example, the study in [3] about the CC1000 radio module of Mica2 motes by Crossbow [4]).
In this paper we present an experimental testbed developed to empirically model the Cisplatin cancer power consumption of commercial motes that implement the entire 802.15.4/ZigBee stack. The obtained results are applied to define a model which, in different circumstances, permits to forecast the battery lifetime of the motes in a wireless sensor network.This paper is organized as it follows: Section 2 outlines the main characteristics of 802.15.4 Medium Access Control. Section 3 reviews the existing literature on the characterization of 802.15.4/ZigBee.
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