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		html4
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	<h2><b><strike>Reserch Topic:</strike></b></h2>
	<center>Published In : <br>IEEE International Conference on Parallel Processing, 2004.</center>

		<h1>
			<u><font color="purple" style="arial"> A Cellular Network Planning Technique to Minimize Exposure to RF Radiation</font></u>
		</h1>
		<h2>
			<font color="blue">Introduction</font>
		</h2>
			<p>
				 Cellular communications use the cellular network as its infrastructure. Service coverage area is divided into smaller areas called <i>cells</i>. Each cell is served by a <i>base station </i>(BS). A base station is connected to the <i>mobile switching center </i>(MSC). MSC connected to the <i>public switched telephone network </i>(PSTN).
			</p><hr>
		<h2>
			<font color="blue">Problem Definition</font>
		</h2>
			<p>
				Given a set S of sites and a planned cellular network T with a fixed cell size and network orientation. To find the position C to deploy the planned network such that the minimal network distance between the site set S and the deployed network T(C) is maximized.
			</p><hr>
		<h2>
			<font color="blue">Solution </font>
		</h2>
			<p>
				Based on a new geometric diagram called the <i><b>nearest-point umbrella diagram</b></i>. S ={P<sub>0</sub> , P<sub>1</sub> , ..., P<sub>n</sub> } set of n planar points. T is thenetwork pattern. The nearest-point umbrella diagram of S under T divide the plane into a set of n regions, UT (P<sub>i</sub> , S) is the locus of points that have smaller network distance to T (P<sub>i</sub> ) than to T (P<sub>j</sub> ) for all j = i. UT (P<sub>i</sub> , S) is the umbrella region of P<sub>i</sub> . If planned network deployed at any point within umbrella region of P<sub>i</sub> then P<sub>i</sub> will have a smaller distance to deployed network than P<sub>j</sub> . To maximize the distance between P<sub>i</sub> and deployed network, Planned network deployed on the point at the contour of umbrella region (C<sub>i</sub> ). that Point has largest distance to P<sub>i</sub> . d<sub>i</sub> is the Network distance between C<sub>i</sub> and P<sub>i</sub> . Compute d<sub>i</sub> for all P<sub>i</sub> . C<sub>k</sub> is the point of deployment of T.
			</p><hr>
		<h2>
			<font color="blue">Conclusion</font>
		</h2>
			<p>
				<i><b>Nearest point umbrella diagram</b></i> of n sites computed in O(n <sup>2</sup>logn) time. Based on the umbrella diagram Minimal exposure problem of size n can be solved in O(n <sup>2</sup> logn) time.
			</p><hr>
		<h2>
			<font color="blue">Limitations</font>
		</h2>
			<p>
				High  complexity of algorithms to compute the umbrella diagrams.

			</p>
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