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diff --git a/3446/CH5/EX5.4/Ex5_4.sce b/3446/CH5/EX5.4/Ex5_4.sce
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+// Exa 5.4
+// To find the number of calls per hour per cell site.
+
+clc;
+clear all;
+
+spectrum=12.5*10^6; //in Hz
+CHBW=200*10^3;//in Hz
+N=4;//reuse factor
+Blocking=0.02; // 2%
+callHT=120;//average call holding time in sec
+PPL=4;//propogation path loss coefficient
+CntrlCH=3; //No of control channels
+Ts=8; // No of voice channels per RF channel
+
+//solution
+No_ofVCH=((spectrum*Ts)/(CHBW*N))-CntrlCH;
+printf('\n No of voice channels for N=4 are %d',No_ofVCH);
+disp("");
+disp("Using the Erlang-B trafﬁc table for 122 channels with 2% blocking,we ﬁnd a trafﬁc load of 110 Erlangs. ");
+TrafLoad=110;
+CarryLoad=(1-Blocking)*TrafLoad;
+Ncall=CarryLoad*3600/callHT;
+printf('\n Calls per hour per cell for N=4 are %d calls/hour/cell \n ',round(Ncall));
+S_I=10*(PPL/2)*(log10(N)-log10(1/3)-(2/PPL)*log10(6));
+printf('\n Mean S/I(dB) for N=4 is %.1f dB \n ',S_I);