Int
ern
at
i
onal
Journ
al of Ele
ctrical
an
d
Co
mput
er
En
gin
eeri
ng
(IJ
E
C
E)
Vo
l.
10
,
No.
3
,
June
2020
,
pp.
3193
~
3199
IS
S
N:
20
88
-
8708
,
DOI: 10
.11
591/
ijece
.
v
10
i
3
.
pp3193
-
31
99
3193
Journ
al h
om
e
page
:
http:
//
ij
ece.i
aesc
or
e.c
om/i
nd
ex
.ph
p/IJ
ECE
A Simu
lation stu
dy of
v
ide
o
c
onf
eren
cing system
over
IEE
E
802.11n
w
ireles
s LAN
Omar
M.
Ali
,
Ya
z
en S
. Shee
t
,
Fir
as
S. Als
ha
rb
aty
Depa
rt
m
ent
o
f
E
le
c
tri
c
al E
ngin
eering,
Mos
ul
Uni
ver
sit
y
,
Ira
q
Art
ic
le
In
f
o
ABSTR
A
CT
Art
ic
le
history:
Re
cei
ved
A
pr
26
, 201
9
Re
vised
Dec
13
,
20
19
Accepte
d
J
an
7
, 2020
W
ire
le
ss
loc
a
l
are
a
n
et
work
(
W
LAN)
is
the
cor
e
of
th
e
class
ic
wire
l
ess
comm
unic
at
ions
s
y
stems
and
o
wns
the
infra
str
uct
ure
wh
ic
h
wi
de
sprea
ds
i
n
m
an
y
reg
ions
in
the
world.
IE
EE
802.
11n
is
an
at
t
rac
t
ive
stand
ard
of
W
LAN
and
offe
rs
a
da
t
a
ca
p
ac
i
t
y
of
th
e
cell
.
Thi
s
pap
er
esti
m
ates
the
m
axi
m
u
m
li
m
it
s
of
the
IE
E
E
802.
11n
st
and
ard
c
el
l
as
a
te
r
m
of
num
ber
of
users
which
are
suc
ce
ss
fully
serve
d
b
y
th
e
c
el
l
in
ca
se
of
vi
deo
conf
ere
n
ce
appl
i
ca
t
ion
.
The
result
s
sho
wn
tha
t,
th
e
c
el
l
of
802.
11n
cou
ld
serve
about
9
user
s
under
the
service
of
vide
o
conf
ere
n
ce
i
n
ca
se
of
20MHz
cha
nne
l
band
width
bef
or
e
conge
stion
oc
cur
s whil
e the 40MH
z
cha
nn
el c
oul
d
support
18
use
rs.
Ke
yw
or
d
s
:
C
hannel
b
an
dwidth
IEEE 8
02.11
n
Vide
o
c
onfer
e
ncin
g
Copyright
©
202
0
Instit
ut
e
o
f Ad
vanc
ed
Engi
n
ee
r
ing
and
S
cienc
e
.
Al
l
rights re
serv
ed
.
Corres
pond
in
g
Aut
h
or
:
Om
ar M.
Ali,
Dep
a
rtm
ent o
f El
ect
rical
En
gi
neer
i
ng,
Mosu
l
U
niv
e
rs
it
y,
Nina
va,
Ir
a
q.
Em
a
il
: o
m
ard
dr8
3@gm
ai
l.com
1.
INTROD
U
CTION
In
rece
nt
ye
ars
,
de
velo
pm
ent
of
m
ob
il
e
de
vi
ces,
su
c
h
as
la
ptops
a
nd
sm
ar
tphon
e
s
ha
s
in
creased
their
popula
rity
an
d
thu
s
the
wirel
ess
net
work
ha
s
bec
om
e
the
prefe
rr
e
d
netw
ork
of
us
ers
,
be
cause
it
al
lo
ws
the
m
to
co
nnect
to
the
Web
a
nd
am
bu
la
te
w
it
hin
a
s
pecifi
c
ge
ographica
l
area
[
1,
2
]
.
O
n
the
oth
e
r
ha
nd,
the
ap
plica
ti
on
s
us
ed
in
t
hes
e
dev
ic
es
ha
ve
beco
m
e
so
phist
ic
at
ed
and
this
has
res
ulted
in
an
inc
re
ase
in
the
am
ou
nt
of
data
to
be
tr
ansf
e
rr
e
d
over
the
wireless
netw
ork
[
3
-
5]
.
The
wireless
netw
ork
rece
ive
s
the
at
te
ntion
o
f
researc
hers
to i
m
pr
ove
the q
ua
li
ty
of
the
co
m
m
un
ic
at
ion
or
to
stu
dy
the
possibil
it
y
of
r
unni
ng
so
m
e app
li
cat
ion
s
w
it
hin
t
he wirel
ess
netw
ork
.
The
IEE
E
802.11
sta
nda
rd
co
ntains
a
series
of
ve
rsions
,
each
one
has
a
te
chnolo
gical
de
velo
pm
ent
ov
e
r
m
any
ye
ars.
In
the
1990
s,
the
first
wir
el
ess
LA
N
s
ta
nd
a
r
d
em
erg
ed
w
hich
s
uppor
ts
a
data
rate
up
to
2Mbps.
H
ow
e
ver,
the 802.1
1b
wi
reless
sta
ndar
d
was
c
reated,
s
uppo
rting
d
at
a
rate up
t
o
11
M
bps u
sin
g
DSS
S
and
F
HS
S
te
c
hnol
og
ie
s
.
It
op
erates
withi
n
t
he
2.4GHz
ba
nd.
T
he
802.1
1a
wireless
sta
nd
ard
has
a
data
r
a
te
of
up
to
54
Mb
ps
us
ing
the
OFDM
te
chnolo
gy
.
It
create
d
in
1999
a
nd
dea
ls
with
the
5GHz
ba
nd.
Net
works,
wh
ic
h
us
e
d
802.1
1g
operate
at
2.4
G
Hz
ba
nd,
t
he
sam
e
ba
nd
as
80
2.11b,
but
t
he
802.1
1g
us
es
O
FD
M
te
chnolo
gy tha
t al
lows
data
ra
te
sp
ee
d
to
r
ea
ch 54 M
bp
s
[
6
-
8
].
The
IEE
E
802.1
1n
sta
nda
rd
was
intr
oduce
d
in
2009.
It
is
based
on
m
a
ny
acce
le
rator
te
chnolo
gies
su
c
h
as
the
M
ulti
ple
Inp
ut
Mult
iple
Ou
t
put
(MIM
O)
te
chnolo
gy,
the
fr
am
e
agg
re
ga
ti
on
,
c
hannel
bondin
g,
and
the
bl
ock
ackno
wled
gm
e
nt
m
echan
ism
to
s
upport
high
data
rate
[
6
]
.
IE
EE
802.1
1n
operates
on
e
it
he
r
the
2.4
GH
z
or
the
5
G
Hz
ba
nd,
it
support
s
two
c
ha
nn
el
band
width
20
MHz
an
d
40
M
Hz
[
6,
7
]
.
T
he
IEEE
802.1
1n
c
ould
su
pp
or
t
the
da
ta
rate
of
6.5
Mbp
s
i
n
the
c
ase
of
t
he
f
ollow
i
ng
c
onditi
on
s
(
20
M
Hz
c
hannel
,
800
ns
guar
d
i
nter
val
GI
m
od
e,
a
nd
1x1
M
IMO
te
ch
nolo
gy)
w
hile
the
high
le
vel
of
802.1
1n
(
600M
bp
s
)
is
achieve
d
un
de
r
the
f
ollow
i
ng
co
nd
it
io
ns
(
40
M
Hz
cha
nn
el
,
400ns
guar
d
inter
val
GI
m
od
e,
and
4x4
MIM
O
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2088
-
8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
10
, No
.
3
,
J
une
2020
:
31
93
-
3199
3194
te
chnolo
gy)
[
9
-
1
2,
8
].
A
vide
o
co
nfere
ncin
g
is
one
of
th
e
m
o
st
i
m
po
rtant
ap
plica
ti
ons
currently
use
d
a
s
an
easy
way
to
m
ake
a
com
m
un
ic
at
io
n
be
tw
een
pe
ople
s
[
1
3
]
.
It
is
us
e
d
t
o
hold
m
eet
ings
betwee
n
m
anag
ers
and
em
plo
ye
es,
to
cond
uct
distance
le
arn
in
g
session
s
,
an
d
et
c
[1
4
]
.
Vi
de
o
co
nf
e
ren
ci
ng
req
ui
res
a
relat
ively
high
data
rate
beca
us
e
it
se
nd
s
vid
e
o
sig
nal
data
.
T
his
is
an
ap
plica
ti
on
th
at
drai
ns
net
work
res
ource
s
,
wh
et
her
wire
d
or
wireless
[
15
]
.
Re
searc
h
has
bee
n
ca
rr
ie
d
out
to
cal
c
ulate
the
up
per
lim
its
of
the
total
de
la
y
tim
e
fo
r
vid
e
o
confere
ncin
g
a
nd
the
ti
m
e
la
g.
The
acce
pta
bl
e
delay
in
c
onfer
e
nce
a
pp
li
ca
ti
on
to
w
ork
w
el
l
is
le
ss than 15
0 m
sec and
the
de
la
y variance
is not m
or
e tha
n 30 m
sec [1
4
,
16
]
.
If
the
vi
deo
is
trans
ferred
without
any
com
pr
essio
n
proce
ss
,
it
will
con
s
um
e
a
lot
data
rate
[17
]
that
the
wi
red
network
m
ay
no
t
be
able
t
o
ca
r
ry
it
,
a
nd
the
r
efore
wireless
netw
ork
will
not
w
ork
.
Accord
i
ng
ly
vid
e
o
c
om
pr
ession
is
m
ade on
the
v
i
deo at r
eal
tim
e b
efo
re
b
ei
ng se
nt
ov
e
r
the
netw
ork
[
18
,
19
]
.
As
t
he
v
id
e
o
confere
nce
be
gan,
s
eve
ral
ve
rsions
of
real
tim
e
vid
eo
c
om
pr
esso
rs
ha
ve
bee
n
create
d
li
ke
(H.26
1,
H263,
H.264,
and
H.2
65)
t
o
m
ini
m
ize
the am
ou
nt
dat
a rate of t
he
t
ran
sm
it
te
d
vide
o
[
1
0
-
2
2
].
2.
LIT
ERATUR
E REVIE
W
The
802.1
1n
wireless
net
work
sta
ndar
d
re
cei
ved
the
at
te
ntion
of
resea
r
cher
s
,
an
d
se
ve
ral
stud
ie
s
hav
e
bee
n
c
ondu
ct
e
d
to
te
st
the
pe
rfor
m
ance
of
t
his
wire
le
ss
sta
nd
a
rd.
In
[23
]
,
t
he
re
searche
rs
c
onduct
e
d
a
stud
y
to
est
im
at
e
the
capaci
ty
of
a
m
ul
tim
edia
app
li
cat
io
ns
su
c
h
as
the
IP
T
V
an
d
V
oIP
ov
e
r
wireles
s
LAN
that
operates
a
ccordin
g
t
o
th
e
802.
11n
wirel
ess
sta
ndar
d
.
T
heir
res
ults
showe
d
a
25%
i
m
pr
ov
em
ent
in
IP
T
V
app
li
cat
io
n
ca
pa
ci
ty
w
hen the
TFRC
pro
t
oco
l
w
as
ad
opte
d wit
hin
t
he
tra
nsport l
ay
er
with the
TCP
prot
oco
l.
S.
D
ha
r
an
d
S
.
Chatt
erj
ee
i
n
[24
]
co
nducte
d
a
stud
y
to
ass
ess
the
perfor
m
ance
of
dif
fe
ren
t
ty
pes
of
so
un
d
com
pr
e
ssion
te
c
hn
i
ques
us
e
d
in
the
app
li
cat
io
n
of
VOIP
wh
e
n
i
t
wo
r
ki
ng
ove
r
the
wi
reless
LAN
sta
nd
a
rd
IEE
E
802.1
1n.
T
he
resu
lt
s
of
the
stud
y
s
howe
d
that
the
us
e
of
the
sou
nd
c
om
pr
essor
ty
pe
G
.
711
giv
es
sat
isfact
or
y
resu
lt
s
in
te
rm
s
of
the
qual
it
y
of
th
e
au
dio
in
ad
diti
on
t
o
the
value
of
the
delay
.
Evizal
A.
Ka
di
r
an
d
et
al
in
[
25
]
,
te
ste
d
the
eff
ect
of
s
om
e
par
am
et
ers
in
the
a
pp
li
cat
ion
of
distance
le
a
rn
i
ng
ov
e
r
t
he
wireless
net
work
sta
nd
a
r
d
of
IEEE
802.1
1
n.
T
heir
te
st
res
ults
showe
d
t
hat
the
WL
AN
can
pr
oppi
ng
up
100
us
er
s
de
al
ing
with
t
he
distance
le
ar
ni
ng
a
pp
li
cat
ion
at
the
sa
m
e
tim
e
.
In
[
26
]
,
t
he
researc
hers
te
ste
d
the
802.1
1n
w
irel
ess
LA
N
QoS
pro
vid
e
d
by
their
pro
pose
d
te
chnol
ogy
to
s
up
port
real
-
ti
m
e
app
li
cat
ion
s
.
Their
res
ults
s
howe
d
that
t
he
ir
pro
pose
d
m
et
hod
im
pr
ove
d
the
qual
it
y
of
se
rv
ic
e
for
re
al
-
tim
e
app
li
cat
ion
s
.
Be
ra
Bulut
an
d
et
al
in
[1
1
]
,
inv
est
igate
d
the
ad
van
ta
ges
of
us
i
ng
A
L
-
FEC
to
transm
it
hig
h
-
qual
it
y
vid
e
o
us
in
g
M
ulti
cast
ov
e
r
the
80
2.11n
wireless
L
AN
with
t
he
use
of
MI
M
O
te
chnolo
gy
,
The
stud
y
c
on
cl
ude
d
that
AL
-
FEC
ca
n
be
us
e
d
to
im
pr
ov
e
both
reli
ab
il
ity
and
t
ran
s
port
e
ff
ic
ie
ncy,
if
MIM
O
cha
nnel
s
has
lo
w
s
patia
l
correla
ti
on
s
3.
PROBLE
M
S
TAT
E
MENT
W
i
reless
L
A
N
is
lim
i
te
d
in
ba
ndwidt
h
a
nd
infl
uen
c
ed
by
exte
rn
al
factors
s
uch
a
s
noise
an
d
interfe
ren
ce
.
U
s
ing
WL
AN
i
n
transf
e
r
data
of
real
-
ti
m
e
app
li
cat
ion
s
su
c
h
as
vid
e
o
co
nfe
ren
ci
ng
poses
m
any
chall
enges.
O
n
the
oth
er
ha
nd
,
m
os
t
of
t
he
previ
ou
s
rele
va
nt
resea
rc
h
cal
culat
e
s
the
var
i
ables
of
t
he
wireless
netw
ork
base
d
on
a
li
m
it
ed
num
ber
of
us
e
rs
,
w
hile
it
is
ne
cessary
to
cal
c
ulate
the
la
rg
e
st
num
ber
of
use
rs
i
n
the
ser
vice
that
the
wireless
netw
ork
can
a
f
ford
for
real
ti
m
e
app
li
cat
ions
befor
e
the
c
ol
la
ps
e
of
the
w
irel
ess
ne
tw
ork.
A
fter
knowin
g
the
br
ea
k
po
i
nt,
s
erv
ic
e
pro
vid
e
rs
will
ha
ve
a
pr
i
or
knowle
dg
e
of
their
w
irel
ess
netw
ork
ca
pa
bili
ti
es.
4.
RESEA
R
CH MET
HO
D
This
pa
per
buil
ds
a
m
od
el
in
order
to
sim
ulate
a
wireless
local
area
net
work
(
WLAN
)
based
on
the
sta
nda
rd
of
802.
11
n
i
n
ca
se
of
vid
e
o
c
onfe
ren
ce
a
pp
li
cat
ion
.
The
re
a
re
tw
o
m
ai
n
sc
enar
i
os
for
t
he
m
od
el
deali
ng
with
the
vid
e
o
c
onfe
ren
ce
a
pp
li
cat
ion,
the
first
on
e
of
fe
rs
the
ba
sic
con
ce
pt
of
this
sta
nd
a
rd
wh
e
re
the
co
nd
it
io
ns
of
the
basic
le
vel
of
t
he
sta
nd
a
r
d
an
d
ba
nd
wi
dth
e
qu
al
to
20MHz
.
Thi
s
scenari
o
ai
m
s
to
m
easur
e
the
ba
sic
capaci
ty
of
the
IE
EE8
02.11
n
cel
l
without
any
enhancem
ent
equ
ipm
ent
s
.
The
second
scenari
o
est
im
at
es
the
capaci
ty
of
IEE
E
80
2.11n
cel
l
in
cas
e
of
upgrade
th
e
band
width
t
o
40
M
Hz.
T
he
m
od
el
of
this
rese
arc
h
is
bu
il
t
us
in
g
Re
ver
bi
d
soft
war
e
a
nd
offers
m
any
per
f
orm
ance
m
et
rics
with
the
incre
m
ent
of
us
ers
num
ber
.
The
basic
co
m
po
nen
ts
of
t
he
m
od
el
s
are
a
serv
e
r
c
onnected
to
wire
le
ss
router
s
uppo
rts
the
sta
ndar
d
of
802.1
1n
w
it
h
wireless
us
er
s,
as
sho
wn
in
F
igure
1
.
T
he
c
om
plete
assumpti
ons
of
t
he
m
od
el
are li
ste
d
i
n
T
a
ble 1
.
Evaluation Warning : The document was created with Spire.PDF for Python.
In
t J
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p
En
g
IS
S
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20
88
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8708
A S
i
mu
l
ation stud
y
o
f vi
deo c
onfe
renci
ng syst
em over
IEEE
802.1
1n wi
rel
ess LAN
(
O
m
ar
M. Ali
)
3195
(a
)
(b
)
Figure
1.
The
W
i
reless
netw
ork
m
od
el
s
:
(
A
)
B
asi
c
m
od
el
,
(B)
C
om
plate
m
od
el
Table
1.
A
ss
um
pt
ion
s
wer
e
a
dopted
in
t
he wirel
ess m
od
el
Para
m
eter
Valu
e
Si
m
u
latio
n
Ar
e
a
Of
f
ice netwo
rk (10
0
x
1
0
0
)
m
ete
r
Netwo
rk ar
ch
itect
u
re
Clien
t
-
Server
W
L
AN stan
d
ard
IE
E
E
8
0
2
.11
n
W
L
AN ban
d
2
.4GHz
No
.
o
f
sp
atial strea
m
s
1
Gu
ard Interval
(G
I
)
4
0
0
ns
Ch
an
n
el ban
d
wid
t
h
2
0
MHz
/ 40
MHz
Data Rate
6
5
M
b
p
s (Base)
Bu
ff
er
size
2
M
B
Netwo
rk Ap
p
licati
o
n
Vid
eo
Co
n
f
erence
Vid
eo
con
f
erence data ra
te
1
0
2
4
Kb
p
s
Tr
an
s
m
iss
io
n
pro
t
o
co
l
UDP
Si
m
u
latio
n
ti
m
e
3
0
0
seco
n
d
s
The
m
et
ho
d o
f t
his r
esea
rch d
epends
on t
hr
e
e m
a
in asp
ect
s:
a)
En
d
to
End
del
ay
≤
1
5
0
m
sec.
b)
Ma
x.
Jit
te
r ≤
30 m
sec.
c)
The rat
io
of tra
ff
ic
≥ 99
%
.
5.
RESU
LT
S
A
ND
DI
SCUS
S
ION
S
Af
te
r
buil
ding
an
IEEE
802.
11n
wireless
LAN
m
od
el
in
the
Ri
verbe
d
S
oft
war
e
M
od
el
e
r
a
nd
config
ur
i
ng
th
e
Ri
verbed
wit
h
the
re
quire
d
set
ti
ng
s,
t
he
si
m
ula
ti
on
w
as
perform
ed
an
d
the
fo
ll
owin
g
resu
lt
s
wer
e
obt
ai
ne
d
.
5
.1
.
Video co
nf
ere
nce M
A
X
.
pa
c
ket
d
el
ay
va
ri
at
i
on
Table
2
s
how
s
the
MA
X.
Packet
Delay
Var
ia
ti
on
of
vid
e
o
c
onfer
e
ncin
g
a
pp
li
cat
ion
for
bot
h
IEEE
802.1
1n
channel
ba
nd
widths.
W
e
c
an
see
that
th
e
delay
var
ia
nc
e
sta
rts
to
app
ea
r
sig
nific
antly
if
the
num
ber
of
co
nnect
ed
node
s
reac
hes
15
for
a
20
MHz
cha
nnel
band
width.
On
t
he
ot
her
hand,
the
incre
ase
in
delay
va
riat
ion
is
noti
ceable
wh
e
n
t
he
num
ber
of
c
onne
ct
ed
no
des
bec
om
es
equ
al
to
24
f
or
the 40M
Hz
c
ha
nn
el
.
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2088
-
8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
10
, No
.
3
,
J
une
2020
:
31
93
-
3199
3196
Table
2.
Vide
o
c
onfe
ren
ce
M
AX.
p
acket
d
el
ay
v
ariat
io
n
MAX.
Packet
Dela
y
Va
riation
(
≤
)
No
.
o
f
us
ers
4
0
MHz
2
0
MHz
9
.57
E
-
8
1
.80
E
-
7
1
2
.97
E
-
7
1
.32
E
-
6
3
2
.30
E
-
6
4
.96
E
-
6
6
3
.03
E
-
6
8
.43
E
-
6
9
6
.28
E
-
6
6
.67
E
-
4
12
8
.59
E
-
6
2
.29
E
-
2
15
3
.35
E
-
4
3
.79
E
-
2
18
1
.09
E
-
3
21
2
.98
E
-
3
24
1
.17
E
-
2
27
5.2.
Video co
nf
ere
nce
p
acke
t
e
nd
-
to
-
e
nd
d
el
ay
(
Sec
.
)
Figure
2
sho
w
s
the
relat
ion
s
hip
bet
ween
vi
deo
co
nf
e
re
nc
ing
pac
ket
E2
E
delay
and
the
increase
of
us
e
rs
nu
m
ber
for
bo
t
h
IEEE
802.1
1n
channel
band
widths.
It
s
ho
uld
be
no
te
d
that
the
inc
re
ase
in
the
en
d
-
to
-
e
nd
delay
val
ue
i
s
directl
y
pr
oport
io
nal
to
t
he
inc
reasin
g
nu
m
ber
of
us
ers
in
each
c
hannel
band
width.
At
20MHz
cha
nnel
band
width,
the
E2E
delay
excee
ds
t
he
vid
e
o
c
onfe
renci
ng
fail
ure
t
hresh
old
delay
w
it
hi
n 1
5 user
s
whil
e
24
us
ers
e
ncroa
ch
the
f
ai
lu
r
e t
hr
es
hold
delay
at
4
0M
Hz
c
ha
nn
el
ba
ndwidt
h.
5.3.
Perce
ntag
e
of
v
ideo
confere
nce
t
r
affic
r
ec
ei
ved/
t
r
affic
s
ent
Figure
3
S
how
s
the
per
ce
ntage
traff
ic
recei
ved
/
traff
ic
se
nt
of
the
vi
deo
con
fe
re
ncin
g
app
li
cat
io
n
for
eac
h
IEEE
802.1
1n
c
hannel
ba
ndwi
dths.
It
is
note
d
that
the
vi
deo
c
onfer
e
nce
is
w
orkin
g
c
orrectl
y
un
ti
l
the
recei
ve
d
vi
deo
becam
e
le
ss
tha
n
t
he
vi
deo
bei
ng
se
nt
becau
se
the
802.11n
reac
h
the
thr
ottl
e
sta
ge.
At
20
M
Hz
ch
ann
el
ba
ndwi
dt
h
the
vid
e
o
confere
nce
w
ork
pr
op
e
rly
with
9
us
ers
,
but
40
M
Hz
c
ha
nn
e
l
band
width ser
ve
d pro
per
ly
18 users
.
Figure
2
.
Vi
de
o
c
onfer
e
nce
p
acket
e
nd
-
to
-
e
nd
d
el
ay
Figure
3.
Perc
en
ta
ge
of
v
ide
o
co
nfe
ren
c
e TR/
TS
5.4.
WLAN
d
ata d
ropp
e
d
Figure
4
Sho
w
s
that
data
dr
op
(Buffe
r
Ov
e
rf
lo
w
)
will
ap
pear
w
he
n
the
num
ber
of
use
rs
e
xceed
9
us
ers
at 2
0MH
z cha
nn
el
ba
ndwidth w
hile da
ta
d
r
op w
il
l ap
pear
w
hen the
nu
m
ber
of u
se
r
s ex
cee
d 18 use
rs
f
or
40
M
Hz
c
ha
nnel
band
width. Th
is happe
ned b
ecau
se
the
nu
m
ber
of
u
se
rs
i
ncr
ease
d
t
o
the
point wh
e
re 802.11
n
cou
l
d no
t t
ran
s
fer
m
or
e
data
f
or each
b
a
ndwi
dth
s
.
5.5.
Wir
el
ess LA
N
dela
y (Sec)
Figure
5
S
hows
that
the
de
la
y
of
the
wir
el
ess
netw
ork
is
increase
d
as
the
am
ou
nt
of
tran
sm
i
tt
ed
vid
e
o
data
inc
reased
a
nd
be
com
es
hig
her
wh
e
n
the
network
reac
hes
the
bott
le
neck
lim
it
.
The
delay
of
the
wir
el
ess
ne
twork
sta
rts
a
t
a
hig
h
rate
wh
e
n
the
nu
m
ber
of
us
ers
be
com
es
gr
eat
er
than
9
in
the
case
of
a
20MHz
c
ha
nn
el
ba
ndwidt
h,
wh
il
e
the
de
la
y
increase
wh
e
n
t
he
num
ber
of
use
rs
e
xceeds
15
at
40
M
H
z
channel
band
w
idth.
Evaluation Warning : The document was created with Spire.PDF for Python.
In
t J
Elec
&
C
om
p
En
g
IS
S
N:
20
88
-
8708
A S
i
mu
l
ation stud
y
o
f vi
deo c
onfe
renci
ng syst
em over
IEEE
802.1
1n wi
rel
ess LAN
(
O
m
ar
M. Ali
)
3197
5.6.
Wir
el
ess LA
N
t
hr
oughp
ut
(
bits/Sec)
Figure
6
sho
ws
that
the
th
rou
ghput
of
the
wir
el
ess
net
work
is
incr
eased
as
t
he
am
ount
of
t
ran
sm
it
te
d
vid
e
o
data
inc
reased
unti
l
the
wireless
ne
twork
reac
hes
t
he
bott
le
nec
k
lim
it
.
At
this
po
i
nt
the
th
rough
put
beg
i
ns
t
o decre
ase d
ue
t
o
the
lack
of
net
work capacit
y f
or such
data.
Figure
4
.
D
at
a
dro
pp
e
d
i
n WL
AN
due t
o buffe
r
ov
e
rf
l
ow
Figure
5.
W
irel
ess LAN
d
el
ay
Figure
6
.
W
irel
ess LAN
t
hro
ughp
ut
6.
CONCL
US
I
O
N
As
m
entione
d
be
fore,
t
his
r
esearch
stu
die
d
the
ca
pacit
y
of
802.1
1n
w
irel
ess
local
a
rea
netw
ork
(
W
L
A
N)
cel
l
as
a
te
rm
of
use
rs
num
ber
in
case
of
vid
e
o
confere
nce
a
ppli
cat
ion
.
T
he
resu
lt
s
of
sim
ulati
on
sh
ow
n
that
the
cel
l
of
802.1
1n
sta
ndar
d
co
ul
d
suppo
rt
9
use
rs
su
c
cessf
ul
ly
(w
it
hout
dat
a
lost
from
rec
ei
ved
traff
ic
point
of
view
)
i
n
cas
e
of
the
ba
nd
width
e
qu
al
to
20
MHz
.
Wh
i
lst
the
nu
m
ber
of
us
e
rs
w
hic
h
are
su
ccess
fu
ll
y
s
upporte
d
by
t
he
cel
l
of
802.1
1n
sta
ndar
d
is
increase
d
t
o
18
us
e
rs
i
n
ca
se
of
40M
Hz
channel
band
width f
or
the sam
e app
li
cat
ion
.
ACKN
OWLE
DGE
MENTS
This
wor
k was
su
pp
o
rte
d by E
le
ct
rical
D
epa
r
t
m
ent, Enginee
rin
g
Coll
eg
e,
Mosu
l
U
niv
e
rs
it
y.
REFERE
NCE
S
[1]
C.
Li,
C.
Peng
,
S.
Lu,
X.
W
ang
and
R.
Chandr
a,
"La
te
n
c
y
-
awa
r
e
rat
e
ada
pt
ation
i
n
802.
11n
hom
e
net
works
,
"
201
5
IEE
E
Confe
ren
c
e
on
Comput
er
Comm
unic
ati
ons (
INFOCOM
)
,
Kow
loon,
pp
.
129
3
-
1301
,
2015
.
[2]
L.
Yu,
H.
Li
an
d
W
.
Li,
"W
irel
ess
Coopera
t
ive
Video
Coding
Us
ing
a
H
y
brid
Digit
a
l
–
Analog
Scheme,
"
in
I
EEE
Tr
ansacti
ons on Cir
cui
ts and
Sys
te
ms
for Vide
o
Technol
og
y
,
vol.
25,
no
.
3
,
pp
.
43
6
-
450,
Mar
.
201
5.
Evaluation Warning : The document was created with Spire.PDF for Python.
IS
S
N
:
2088
-
8708
In
t J
Elec
&
C
om
p
En
g,
V
ol.
10
, No
.
3
,
J
une
2020
:
31
93
-
3199
3198
[3]
T.
Kae
wkir
i
y
a
,
"P
erf
orm
anc
e
compari
son
of
W
i
-
Fi
IEE
E
80
2.
11ac
and
W
i
-
Fi
IEE
E
802
.
1
1n,
"
2017
2nd
Inte
rnational
C
onfe
renc
e
on
C
omm
unic
ati
on
S
yste
ms
,
Comput
ing
and
IT
Ap
pli
cations
(
CSCIT
A)
,
Mum
bai
,
pp.
235
-
240
,
20
17
.
[4]
J.
Pokhrel
et
al
,
"
Perform
anc
e
Eva
lu
at
ion
of
V
ide
o
tra
nsm
ission
over
802.
11n
wire
le
ss
net
wor
k:
A
MA
C
lay
e
r
per
spec
t
ive
,"
2014
Inte
rnational
Confe
renc
e
on
Smar
t
Comm
u
nic
ati
ons
in
N
etwor
k
Technol
og
ie
s
(
SaCoNeT
)
,
IEE
E
,
2014
.
[5]
Q.
Chen
and
D.
W
u,
"D
el
a
y
-
Ra
t
e
-
Distorti
on
Mo
del
for
R
eal
-
Tim
e
Video
Com
m
unic
at
ion
,
"
in
IEE
E
Tr
ansactio
ns
on
Circui
ts
and
Syste
ms
for Vide
o
Technol
og
y
,
v
ol.
25
,
no
.
8
,
pp
.
1376
-
1394,
Aug.
2015.
[6]
O.
O.
Olusegun
and
C.
E
.
T
an,
"TCP
throughput
eff
i
ci
en
c
y
en
hanc
ement
in
I
EE
E
802
.
11n
n
et
work,"
2013
8
th
Inte
rnational
Co
nfe
renc
e
on
Info
rm
ati
on
Technology
in
Asia
(
C
IT
A)
,
Kota
Sam
ar
a
han,
pp
.
1
-
5
,
201
3
.
[7]
W
.
Os
te
rha
ge
,
"
W
ire
le
ss
Networ
k
Secur
i
t
y
,
" Pub
li
shed
b
y
CRC P
ress T
a
y
lor
&
Franc
is Group
,
pp
.
20
-
27,
2018.
[8]
D.
Mara
j
and
A.
Mara
j
,
"P
er
form
anc
e
an
alys
is
of
W
LAN
802.
11g/n
st
and
ard
s
using
OP
NET
(Riv
erb
ed
)
appl
i
ca
t
ion,
"
20
15
57th
In
te
rnati
onal
Symposium
ELMAR (
ELMAR
)
,
Za
d
ar
,
pp.
12
9
-
132
,
2015
.
[9]
S.
K.
Debna
th
et
al
,
"A
Throu
ghput
Esti
m
at
io
n
Model
for
IE
EE
802.
11n
MI
MO
Li
nk
in
W
ire
le
ss
Local
Are
a
Networks,"
3rd I
nte
rnational
Co
nfe
renc
e
on
Co
mputer
and
Com
municat
ion
System
s (
I
2S
)
,
IEE
E
,
2018.
[10]
A.
Srivasta
va
et
al
,
"
Covera
g
e
I
m
prove
m
ent
of
IEE
E
802
.
11n
Ba
sed
Campus
W
i
de
W
ire
le
ss
LA
Ns
,
"
Inte
rnation
al
Confe
renc
e
on
A
dvanc
es
in
Com
municat
ion
and
Computing
Tech
nology
(
ICACCT)
,
IEE
E
,
2018
.
[11]
B.
Bulut
et
al
,
"
Cross
-
Lay
er
Design
of
Rap
tor
Codes
for
Vide
o
Multi
c
ast
ove
r
802.
l
ln
MIM
O
Channe
ls
,"
26t
h
Inte
rnational
S
y
mpos
ium
on
Pe
rs
onal,
Indoor
and
Mobil
e
Radi
o
Comm
unic
ati
ons
-
(
PIM
RC)
:
Mo
bil
e
and
W
irel
es
s
Net
works,
I
EEE,
2015.
[12]
R.
Karm
aka
r,
S.
Chat
topa
dh
y
a
y
and
S.
Chakra
bort
y
,
"Im
pac
t
of
IEE
E
802.
11n/
ac
PH
Y/MA
C
High
Throughput
Enha
nc
ements
on
Tra
nsport
and Applic
a
ti
on
Prot
ocol
s
—
A Survey
,
" i
n
IE
EE
Comm
unic
ati
ons Surve
ys
&
T
utorial
s
,
vol.
19
,
no
.
4
,
pp
.
2050
-
2091
,
Fo
urthqua
rt
er
2017
.
[13]
A.
Bahna
ss
e
et
al
,
"
D
y
namic
Multi
point
Virtu
al
Private
Network
infl
uence
on
Video
Confer
enc
ing
Qual
ity
of
Servic
e
,
"
2019
2
nd
Inte
rnat
ional
Confe
renc
e
on
C
omputer
Applica
ti
ons
&
Infor
mation
Se
curit
y
(
ICCAIS)
,
2019.
[14]
F.
S.
Alsharba
t
y
et
al
,
"P
erf
orma
nce
Ev
al
ua
ti
on
of
Adapti
ve
Re
al
Ti
m
e
Applic
a
ti
on
in
the
Cel
l
of
IEE
E
802.
16
e
Standa
rd
,"
Jour
n
al
of
Adv Research
i
n
Dynamic
a
l
&
Control
System
s
, v
ol. 10, 09
-
Special
Iss
ue
,
201
8.
[15]
P.
La
ddha
and
S.Ra
m
al
ing
am,
"
Bit
rate
and
Co
m
ple
xity
Optimi
za
t
ions
for
Vide
o
Confer
encing
S
y
stems
,"
2016
IEE
E
Inte
rnat
io
nal
Conf
ere
nce
on
Consum
er
Elec
troni
cs
(
ICCE)
,
IEE
E
,
2016
.
[16]
A.
Te
sfam
ic
a
el
et
al
,
"
Model
ing
for
a
QoS
-
Eff
ic
ie
nt
Re
al
-
T
ime
Video
C
onfe
ren
ci
ng
S
y
stem
in
t
he
Cloud,
"
2018
26th
Int
ernati
on
al
Conf
ere
nce o
n
Soft
ware
,
Te
lecomm
unic
ati
ons
and
Computer
N
et
works (
Soft
COM)
,
IEE
E
,
2018
.
[17]
Q.
Shi
and
H
S
un,
"Im
age
and
vide
o
compress
ion
for
m
ult
im
edi
a
eng
ineeri
ng
:
Fundam
ent
al
s,
al
gorit
hm
s,
an
d
standa
rds
,"
CRC
pre
ss
,
pp
.
3
-
4
,
2
008
.
[18]
A.
Li
u,
W
.
Li
n,
M.
Paul,
F.
Zha
ng
and
C.
Deng,
"
Optimal
Com
pre
ss
ion
Plane
for
Eff
icient
Video Coding,
" i
n
IE
E
E
Tr
ansacti
ons on Im
age
Proc
essing
,
vol
.
20
,
no
.
10
,
pp
.
2788
-
2799
,
Oct. 2011
[19]
E.
R
ic
h
ard
son,
"
The
H.264
Adva
nce
d
Vid
eo
Com
pre
ss
ion
Standa
r
d
,"
John W
il
e
y
&
Sons
Lt
d
.
,
20
10.
[20]
I.
U.
Khan
et
a
l
,
"
Perform
anc
e
Anal
y
sis
of
H.
264
Video
Dec
oder
:
Algorit
hm
and
Applic
a
ti
o
ns
,"
Inte
rnation
al
Confe
renc
e
on
E
nergy
E
conomics
and
Environm
e
nt
(
ICEE
E)
,
I
EEE,
2015
.
[21]
N.
Minal
la
h
et
a
l
,
"
Perform
anc
e
Anal
y
sis
of
H.2
65/HEVC
(HighEff
iciency
Vid
e
o
Coding)
with
ref
ere
n
ce
to
Oth
e
r
Codec
s
,
"
13
th
In
te
rnational
Conf
ere
nce on Fronti
ers of
Informatio
n
Technol
og
y
,
I
EE
E
,
2015
.
[22]
Y.
Yoon,
M.
Kim
,
S.
Le
e,
B
.
Lee,
S.
J.
H
y
un
an
d
K.
Le
e
,
"P
erf
orm
anc
e
anal
y
s
is
of
H.264/
AV
C,
H.264/
SV
C,
and
VP
8
over
IEEE
802.
11
wir
el
ess
net
works
,
"
201
2
IEE
E
Symposi
um
on
Compute
rs
and
Comm
un
ic
ati
ons
(
ISCC)
,
Cappa
doc
ia
,
pp
.
000151
-
000156
,
2012
.
[23]
S.
Sale
h
and
et
al
,
"Capa
ci
t
y
Anal
y
sis
of
Co
m
bine
d
IPTV
a
nd
VoIP
ov
er
I
EE
E
802.
11n
,"
38th
Annua
l
IE
E
E
Confe
renc
e
on
Local
Comput
er
Net
works
,
I
EEE,
2013.
[24]
S.
Dhar
and
S
Chat
t
erj
e
e,
"
A
Stu
d
y
of
Voip
Code
cs
Perform
anc
e
Over
Iee
e
8
02.
1
1n
,"
2017
Dev
i
c
es
for
Inte
grated
Circui
t
(
Dev
IC)
,
IEEE, 2017.
[25]
E.
A.
Kadir
e
t
al
,
"P
erf
orm
anc
e
Anal
y
sis
of
W
ire
le
ss
LAN
802.
11n
Standa
rd
for
e
-
Learni
ng
,
"
Fo
urth
Inte
rnation
al
Confe
renc
e
on
I
nformation
and
Comm
unic
ati
on
Technol
ogi
es
(
ICoICT)
,
IEE
E, 2
016.
[26]
E.
Cha
rfi
et
al
,
"
QoS
Support
of
Voice
/v
ide
o
Se
r
vic
es
under
IE
E
E
802.
11n
W
LA
Ns
,
"
9th
Inte
rnat
ional
Symposiu
m
on
Comm
unic
ation Sy
stems,
Networ
ks
&
Digit
al
Sign
(
CSNDSP)
,
IEEE, 2014.
BIOGR
AP
H
I
ES
OF
A
UTH
ORS
Omar
M.
Ali
c
om
ple
te
d
the
B.
S.
in
el
ectri
ca
l
e
ngine
er
ing
/
e
le
c
tr
onic
and
comm
unic
a
ti
on
from
Univer
sit
y
of
Mos
ul,
Ira
q,
in
20
0
6
and
recei
ved
the
M.Sc
degr
ee
in
computer
netw
orks
in
201
2
from
Mos
ul
Uni
ver
sit
y
.
He
inter
este
d
in
the
fi
el
d
of
computer
ne
t
works
and
comm
unic
at
ion
and
he
had
publica
tion
pape
rs
in
W
LAN
(
802.
11a,
802.
11g,
and
80
2.
11n)
.
He
has
b
ee
n
working
as
a
comm
unic
at
io
ns
le
ct
ure
r
and
computer
net
wo
rks
le
ct
ure
r
a
t
Univer
sit
y
of
Mos
ul
since
201
2
.
He
is a mem
ebe
r
of
comput
er
n
etw
orks l
ab
in
E
lectr
i
ca
l
Dept
/
Eng
ine
er
ing
Col
le
g
e
.
Evaluation Warning : The document was created with Spire.PDF for Python.
In
t J
Elec
&
C
om
p
En
g
IS
S
N:
20
88
-
8708
A S
i
mu
l
ation stud
y
o
f vi
deo c
onfe
renci
ng syst
em over
IEEE
802.1
1n wi
rel
ess LAN
(
O
m
ar
M. Ali
)
3199
Ya
z
en
S.
Sh
ee
t
complet
ed
the
B
.
S.
in
elec
t
rical
e
ngine
er
ing
/
e
le
c
tr
onic
and
comm
unic
a
ti
on
from
Univer
sit
y
of
Mos
ul,
Ira
q,
in
20
0
5
and
recei
ved
the
M.Sc
degr
ee
in
computer
netw
orks
in
201
1
from
Mos
ul
Uni
ver
sit
y
.
He
inter
este
d
in
the
fi
el
d
of
computer
ne
t
works
and
comm
unic
at
ion
and
he
had
publica
tion
pape
rs
in
80
2.
16e
.
He
h
as
bee
n
working
as
a
co
m
m
unic
at
io
ns
le
ct
ur
er
and
computer
net
wo
rks
le
ct
ur
er
a
t
Univer
sit
y
of
M
osul
since
2012.
He
is
a
m
emebe
r
of
computer
net
works
la
b
in
El
e
ct
ri
ca
l
Dept
/
Engi
ne
eri
ng
Co
l
le
ge
.
Fi
ras
S.
Alsh
ar
baty
completed
the
B.
S.
in
elec
t
ric
a
l
engi
n
ee
r
ing
/
elec
tron
ic
and
c
om
m
unic
at
ion
from
Univer
sit
y
of
Mos
ul,
Ira
q,
i
n
2007
and
received
the
M.Sc
d
e
gre
e
in
computer
net
works
and
comm
unic
at
ion
i
n
2010
from
Mo
sul
Univer
sit
y
.
He
int
ere
st
ed
in
the
field
of
computer
net
works
and
comm
unic
ation
and
he
had
publi
c
at
ion
pap
e
rs
in
W
iM
AX
(
802.
16d,
802.
16
e),
Mesh,
LTE
and
zi
gb
ee.
He
has
bee
n
workin
g
as
a
comm
unic
ations
le
c
ture
r
and
computer
n
e
tworks
le
ct
ur
er
at
Univer
sit
y
of
Mos
ul
since
2011.
He
is
a
me
m
ebe
r
of
computer
n
et
works
la
b
in
Elec
tri
c
al
Dept/
Engi
n
ee
r
in
g
Coll
ege
.
Evaluation Warning : The document was created with Spire.PDF for Python.