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 nodesset 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 $cbr0#create sinkset null0 [new Agent/Null]$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 Imperceptible31-37 4 Good Perceptible/

non annoying25-30 3 Fair Slightly

annoying20-24 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