Transcript Quality evaluation of MPEG4 video transmission over GPRS

Quality evaluation of MPEG4
video transmission over GPRS
networks..
Presented by:
Abdullah M. Rana
Multimedia Communication
Project Overview…

Motivation of the Project…
◦
◦
◦
◦
◦
Multimedia Transmission
Low bandwidth wireless networks
Cellular Network infrastructure
GPRS as the medium
Applications requiring better audio/video
quality these wireless networks..
◦ NS2 Network Simulator
◦ Evalvid- Quality Evaluation.
GPRS

GSM based architecture

Provision for multi slotting

IP Network

Channel Protection Coding schemes (CS1-CS3)
• Packet switched radio transmission
• Suited for bursty applications (e.g. Internet)
• Data rates up to 170 kbps
• Re-uses GSM resources
• Lower call set-up times; cheaper

Scheme
Code Rate
Throughput(bits/ts)
Data Rate

cs-I
I /2
6400
9.05

cs-2
2/3
9880
13.4

cs-3
3/4
11600
15.6

cs-4
1
16280
21.4
GPRS architecture
www.networkdictionary.com/images/gprs.jpg
Network Simulator NS2
• Event driven simulator
• Split language – OTcl and C++
• Nodes and links; routing algorithms; queuing
•
•
•


schemes
Protocols – TCP, UDP, IP
Traffic generators – CBR, Exponential, Pareto
Basic mobility support.
Graphical interface NAM
Graphs - Xgraph
Evalvid
hpds.ee.ncku.edu.tw/.../image017.jpg
Example TCL script
set ns1 [new Simulator]
#Creating two nodes
set node1 [$ns1 node]; set node2 [$ns1 node]
#Creating a link between the nodes; prop delay=10ms; Drop tail.
$ns duplex-link $n0 $n1 1Mb 10ms DropTail
#Nodes themselves don't send/receive data. Create an agent to do so
set cbr0 [new Agent/CBR]
$ns attach-agent $n0 $cbr0
#create sink
set null0 [new Agent/Null]
$ns attach-agent $n1 $null0
#connect the two agents
$ns connect $cbr0 $null0
#Tell cbr0 when to start and stop
$ns at 0.5 "$cbr0 start"
$ns at 4.5 "$cbr0 stop“
$ns run
Wireless Simulation code
# Set up hierarchical routing.
# Specify topology.
# Create ‘God’
# Create a Base Station
$ns_ node-config -adhocRouting DSR
-llType
LL
-macType
802.11
-ifqType
DropTail
-ifqLen
100
-antType
OmniAntenna
-propType
TwoRayGround
-phyType
WirelessPhy
-topoInstance $topo
-wiredRouting ON
-agentTrace
ON
-routerTrace ON
-macTrace ON
-movementTrace OFF
-channel $chan_
Wireless Simulation Code
set BS(0) [$ns_ node 1.0.0]
$BS(0) random-motion 0
$BS(0) set X_ 1.0
$BS(0) set Y_ 2.0
# create mobile nodes in the same domain as BS(0)
$ns_ node-config -wiredRouting OFF
set node_(0) [ $ns_ node 1.0.1]
$node_(0) base-station [AddrParams addr2id [$BS(0) node-addr]]
#create and attach Agents – TCP/UDP/CBR
:
:
#include movement..
$ns_at 10.0 “$node(0) setdest 200.0 150.0 15.0
:
:
:
Quality Evaluation..
PSNR
MOS
Quality
Impairment
> 37
5
Excellent
Imperceptible
31-37
4
Good
Perceptible/ non
annoying
25-30
3
Fair
Slightly annoying
20-24
2
Poor
Annoying
<20
1
Bad
Very annoying
Results…
File Sizes vs. PSNR
FPS= 20 , BIT Rate= 128KBPS, Q=15, size =Qcif
40
35
P
S
N
R
30
25
20
15
10
5
0
10
15
20
25
30
35
File Sizes in Kbs
40
45
50
55
60
70
80
Results…
Frame rate vs. PSNR
File Size= 10Kb, Bit rate= 128 kbps, Q=15
40
P
S
N
R
35
30
25
20
15
10
5
0
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Frame Rate in Frames per Second
Results…
Quantization Scale vs. File size
Bit Rate= 128Kbps, FPS=10, GOP=13, Size= Qcif, error
resilience=4
35
30
Quantization
Scale
25
20
15
10
5
0
150
105
95
77
56
41
29
21
File Sizes in Kbs
19
16
14
11
9
7
6
5
Results…
Bit rate vs. File Size
FPS= 10, GOP=30, size= Qcif, Q=15, error= 4
400
Fi
I
e
Si
z
e
350
300
250
200
150
100
50
0
1024
512
256
128
64
Bit Rate in Kbps
32
16
8
4
2
1
Results…
GOP vs File Size
FPS=10, Bit rate=5Kbps, Q=15,size=Qcif,error=4
70
60
File
Size
50
40
30
20
10
0
60
55
50
45
40
GOP
35
30
25
20
15
10
5
2