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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 21 : Cellular Radio"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 1 : pg 795"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Handoff time is 720.0 sec\n",
+      "Handoff time is 36.0 sec\n"
+     ]
+    }
+   ],
+   "source": [
+    " \n",
+    "# page no 795\n",
+    "# prob no 21.1\n",
+    "#calculate the hand off time\n",
+    "#given\n",
+    "v=100.;#in km/hr\n",
+    "# first convert speed into m/sec\n",
+    "v1=(100.*10**3)/3600;#in km/sec\n",
+    "#calculations and results\n",
+    "#part a)\n",
+    "r=10.**4;#in m\n",
+    "t=(2*r)/v1;\n",
+    "print 'Handoff time is',t,'sec'\n",
+    "#part b)\n",
+    "r=500;#in m\n",
+    "t=(2*r)/v1;\n",
+    "print 'Handoff time is',t,'sec'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 2 : pg 807"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "a) The average traffic is 416.667 E\n",
+      "The peak traffic is 3333.333 E\n",
+      "b) The average traffic per cell is 3.472 E\n",
+      "The peak traffic per cell is 27.778 E\n"
+     ]
+    }
+   ],
+   "source": [
+    " \n",
+    "# page no 807\n",
+    "# prob no 21.2\n",
+    "#calculate the average and peak traffic\n",
+    "#given\n",
+    "N = 12\n",
+    "m = 120.\n",
+    "a = 20000.\n",
+    "th = 30.#in min/day this means\n",
+    "H = 0.5\n",
+    "tp = 10.\n",
+    "#calculations and results\n",
+    "#part a)Calculation of the average and peak traffic in erlangs for the whole\n",
+    "#system\n",
+    "# The average traffic is\n",
+    "T = a * H / 24\n",
+    "print 'a) The average traffic is',round(T,3),'E'\n",
+    "# The peak traffic is\n",
+    "T1 = (a * tp) / 60\n",
+    "print 'The peak traffic is',round(T1,3),'E'\n",
+    "#part b)Calculation of the average and peak traffic in erlangs for one cell\n",
+    "# The average traffic per cell is\n",
+    "t = T / m\n",
+    "print 'b) The average traffic per cell is',round(t,3),'E'\n",
+    "# The peak traffic per cell is\n",
+    "t = T1 / m\n",
+    "print 'The peak traffic per cell is',round(t,3),'E'\n",
+    "# part c)\n",
+    "# For average traffic at 3.47E, the blocking probability is much less than 1%,\n",
+    "# since the average no of call is much less than the no of channels. \n",
+    "#However, the blocking probability increases to just over 5%"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 3 : pg 816"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The maximum distance between base and mobile is 36900.0 m\n"
+     ]
+    }
+   ],
+   "source": [
+    " \n",
+    "# page no 816\n",
+    "# prob no 21.3\n",
+    "#calculate the max distance\n",
+    "#given\n",
+    "tg=123.*10**-6;\n",
+    "c=3.*10**8;\n",
+    "#calculations\n",
+    "#The maximum distance between base and mobile is\n",
+    "d=c*tg;\n",
+    "#results\n",
+    "print 'The maximum distance between base and mobile is',d,'m'"
+   ]
+  }
+ ],
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