Assignment: Cell Coverage and Capacity Planning

TCOM$8011-$ Spring $2024$

July $9,2024$

$1$ Objective

You need to design a cellular network for a metropolitan area, ensuring both adequate

coverage and sufficient capacity to handle expected user traffic.

$1\mathrm{.}1$ Scenario

You are tasked with designing a cellular network for a city with an area of $688$ km$2.$ The

dedicated system bandwidth for that service area is $16\mathrm{.}8$ MHz$.$ Frequency reuse concept is

applied to enhance the system capacity, cluster size N $=7.$

$2$ Tasks and Steps

$2\mathrm{.}1$ Determine the Cell Radius

$$ Carrier frequency fc: $900$ MHz

$$ Path Loss Model: Use the Hata model for urban areas.

$$ The Hata model for urban areas is given by:

PL $=69\mathrm{.}55+26\mathrm{.}16$ log$10($fc$)13\mathrm{.}82$ log$10($hb$)\backslash$alpha $+$

$44\mathrm{.}96\mathrm{.}55$ log$10($hb$)$

log$10($d$)$

where

fc $=$ frequency in MHz

hb $=$ height of the base station antenna in meters $($assume $30$ meters$)$

hm $=$ height of the mobile antenna in meters $($assume $1\mathrm{.}5$ meters$)$

d $=$ distance between the base station and the mobile in kilometers

$\backslash$alpha $=$ correction factor for mobile antenna height:

$1$

$\backslash$alpha $=3\mathrm{.}2$

log$10(11\mathrm{.}75$ hm$)$

$2$

$4\mathrm{.}97$

Assume the acceptable path loss is $133$ dB$.$

$$ Calculate Cell Radius:

$-$ Using the Hata model, rearrange to solve for d$,$ the cell radius.

$2\mathrm{.}2$ Determine the Number of Clusters

$$ City Area $($ATotal$)$: $688$ km$^2$

$$ Coverage Area of Each Cell: Use the cell radius calculated to find the area covered

by each cell $($approximate each cell as a hexagon$)$:

Acell $=$

$3$

$$

$3$

$2$

d$2$

$$ Area of every Cluster $($km$2)$:

ACluster $=$ Acell $\backslash$times N

$$ Number of Clusters M $($round to integer$)$:

M $=$

ATotal

ACluster

$2\mathrm{.}3$ Calculate the System$$s Capacity

$$ System bandwidth $=16\mathrm{.}8$ MHz

$$ Channel bandwidth $=50$ kHz

$$ No$.$ of channels to be reused in each cluster:

Channels per cluster $=$

System bandwidth

Channel bandwidth

$$ Capacity of Each Cell:

Cell Capacity $=$

Channels per cluster

N

$$ Total System capacity:

System Capacity $=$ Channels per Cluster $\backslash$times Clusters