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Quality evaluation of Quality evaluation of MPEG4 video MPEG4 video transmission over GPRS transmission over GPRS networks..networks..
Presented by:Abdullah M.
RanaMultimedia
Communication
Project Overview…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.
GPRSGPRS 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 architectureGPRS architecture
www.networkdictionary.com/images/gprs.jpg
Network Simulator NS2Network 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 NAMGraphs - Xgraph
EvalvidEvalvid
hpds.ee.ncku.edu.tw/.../image017.jpg
Example TCL scriptExample TCL scriptset 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“
$ns run
Wireless Simulation codeWireless Simulation code# Set up hierarchical routing.# Specify topology.# Create ‘God’
# Create a Base Station$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 $chan_
Wireless Simulation CodeWireless Simulation Codeset BS(0) [$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 OFFset 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..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…Results…File Sizes vs. PSNR FPS= 20 , BIT Rate= 128KBPS, Q=15, size =Qcif
Results…Results…Frame rate vs. PSNR File Size= 10Kb, Bit rate= 128 kbps, Q=15
Results…Results…Quantization Scale vs. File size Bit Rate= 128Kbps, FPS=10, GOP=13, Size= Qcif, error resilience=4
Results…Results…Bit rate vs. File Size FPS= 10, GOP=30, size= Qcif, Q=15, error= 4
Results…Results…
GOP vs File SizeFPS=10, Bit rate=5Kbps, Q=15,size=Qcif,error=4