Volume : III, Issue : II, February - 2013

GTS Allocation Of IEEE 802.15.4 Used in Irrigation System

Prof. Ms. A. K. Patil, Prof. A. J. Patil

Abstract :

The accurate determination of an irrigation schedule is a time–consuming and complicated process. The introduction of computer programs, however, has made it easier and it is possible to schedule the irrigation water supply exactly according to the water needs of the crops. Ideally, at the beginning of the growing season, the amount of water given per irrigation application, also called the irrigation depth, is small and given frequently. This is due to the low evapotranspiration of the young plants and their shallow root depth. During the mid season, the irrigation depth should be larger and given less frequently due to high evapotranspiration and maximum root depth. Thus, ideally, the irrigation depth and/or the irrigation interval (or frequency) vary with the crop development. When sprinkler and drip irrigation methods are used, it may be possible and practical to vary both the irrigation depth and interval during the growing season. With these methods it is just a matter of turning on the tap longer/shorter or less/more frequently. When surface irrigation methods are used, however, it is not very practical to vary the irrigation depth and frequency too much. With, in particular, surface irrigation, variations in irrigation depth are only possible within limits. It is also very confusing for the farmers to change the schedule all the time. Therefore, it is often sufficient to estimate or roughly calculate the irrigation schedule and to fix the most suitable depth and interval. Irrigation water supply is implemented by wireless sensor network.for guarnted time slot between water supply as per demand of crops we use IEEE 802.15.4 protocol. The IEEE 802.15.4 protocol proposes a flexible communication solution for Low–Rate Wireless Local Area Networks including sensor networks. It presents the advantage to fit different requirements of potential applications by adequately setting its parameters. When enabling its beacon mode, the protocol makes possible real–time guarantees by using its Guaranteed Time Slot (GTS) mechanism. However, power efficiency and real–time guarantees are two antagonist requirements in wireless sensor networks. This paper analyzes the performance of the GTS allocation mechanism in IEEE 802.15.4. The analysis gives a full understanding of the behavior of the GTS mechanism with regards to delay, throughput and power efficiency metrics. First, we propose two accurate models of service curves for a GTS allocation as a function of the IEEE 802.15.4 parameters. We then evaluate the delay bounds guaranteed by an allocation of a GTS using Network Calculus formalism. Finally, based on the analytic results, we analyze the impact of the IEEE 802.15.4 parameters on the throughput, delay and power efficiency of a GTS allocation. The results of this work pave the way for an efficient dimensioning of an IEEE 802.15.4 cluster.

Keywords :

Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Prof. Ms. A.K. Patil,Prof.A.J.Patil GTS Allocation Of IEEE 802.15.4 Used in Irrigation System Indian Journal of Applied Research, Vol.III, Issue.II February 2013

Number of Downloads : 333

References :