CHAPTER 6 - Frequency Management and Channel Assignment

EXAMPLE 6.1 - PG NO.159

In [1]:
#page no. 159
K=4.
tbw=20.*10.**6.#total bandwidth
cbwpc=25.*10.**3.#channel bandwidth/simplex channel
n=2.#in a duplex link no of channels
dcbw=n*cbwpc#duplex channel bandwidth
N=tbw/dcbw
N1=N/K
print '%s %d %s' %('total no. of duplex channels =',N,'channels')
print '%s %d %s' %('no.of channels per cell-site =',N1,'channels')

total no. of duplex channels = 400 channels
no.of channels per cell-site = 100 channels

EXAMPLE 6.4 - PG NO.162

In [3]:
#page no. 162
K=4.
N=9.#no.of cells in 1 cluster
tbw=60.*10.**6.#total bandwidth
cbwpc=25.*10.**3.#channel bandwidth/simplex channel
n=2.#in a duplex link no of channels
dcbw=n*cbwpc#duplex channel bandwidth
N=tbw/dcbw

sbw=10.**6.#bandwidth for setup channels
N1=sbw/dcbw#total no.of available setup channels
print'%s %.f %s' %('total no.of available setup channels =',N1,'channels')

vbw=tbw-sbw
N2=vbw/dcbw#total no. of available voice channels

print'%s %.f %s' %('total no.of available voice channels =',N2,'voice channels')

total no.of available setup channels = 20 channels
total no.of available voice channels = 1180 voice channels

EXAMPLE 6.5 - PG NO.164

In [4]:
#page no.164
NV=168.
N=7.
NVpc=NV/N#number of voice channels omnidirectional case

NS=3.
NScl=N*NS
NcS=NV/NScl #number of voice channels 3-sector

NS1=6.
NScl1=N*NS1
NcS1=NV/NScl1 #number of voice channels 6-sector

print'%s %.f' %('number of voice channels assigned in each cell is =',NVpc)

print'%s %.f' %('number of voice channels assigned in each sector(3-sector case) is =',NcS)

print'%s %.f' %('number of voice channels assigned in each sector(6-sector case) is =',NcS1)

number of voice channels assigned in each cell is = 24
number of voice channels assigned in each sector(3-sector case) is = 8
number of voice channels assigned in each sector(6-sector case) is = 4

EXAMPLE 6.10 - PG NO.173

In [5]:
#page no. 173
import math
R2=20.
N=7.
R1=R2/2.6
A=round(3.*math.sqrt(3.)/2.*R1**2.)#size of smaller cell
print'%s %.f %s' %('size of each smaller cell is =',A,'kmsqr')

size of each smaller cell is = 154 kmsqr