Introduction to VoIP
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 1 2 3 4 5 6 7 8 9 10 11 sended/received packets tim e (in packetunits) X X sended packets received packets playouttim e (a) playouttim e (b) • clustering / dispersion → overflow / time-outs • Trade-offs management: Delay ↔ Loss Introduction to VoIP
description
Introduction to VoIP. clustering / dispersion → overflow / time-outs Trade-offs management: Delay ↔ Loss. Project Goals. Implementation of VoIP CRN Model using MATLAB @ Executing and Performance studying. Network & Codec. Jitter Buffer. Voice Quality. Loss. Delay. λ. K. - PowerPoint PPT Presentation
Transcript of Introduction to VoIP
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11se
nded
/rece
ived
pac
kets
time (in packet units)
XX
sended packetsreceived packetsplayout time (a)playout time (b)
• clustering / dispersion → overflow / time-outs • Trade-offs management: Delay ↔ Loss
Introduction to VoIP
Project Goals Implementation of VoIP CRN Model using
MATLAB@
Executing and Performance studying
E-model MOS
Kλ
Delay Loss
TDelay
Network conditions •Delay•Loss
Codec characteristics•Equipment impairment•Loss robustness
R-Factor
jitter bufferjitter
buffercodec codeccodec codec
jitter buffer controller
Voice Quality
Jitter Buffer
Network & Codec
System’s Model
E-model MOSR-Factor
jitter bufferjitter
buffercodec codeccodec codec
jitter buffer controller
Voice Quality
Jitter Buffer
Network & Codec
CRN System’s Model
CRN
E-model MOS
Kλ
Delay Loss
TDelay
Network conditions •Delay•Loss
Codec characteristics•Equipment impairment•Loss robustness
R-Factor
jitter bufferjitter
buffercodec codeccodec codec
jitter buffer controller
Voice Quality
Jitter Buffer
Network & CodecCRN System’s Model
C(t)
Spectrum opportunities
Network Simulator
Performance Studying
Scenarios generator
MOS
Channel State
Simulator
Adaptive Jitter
Buffer
Network simulator
Class Diagrams
Initial ResultsCRN activity vs. time for =0.1=0.1
time [sec]
chan
nel n
o.
100 200 300 400 500
5
10
15
20
25
CRN activity vs. time for =0.5=0.1
time [sec]
chan
nel n
o.
100 200 300 400 500
5
10
15
20
25
C=10MOS results (Network.type, participant.type, JBuffer.type)
4 3 2 1 JBuffer
4 3 2 1 4 3 2 1 4 3 2 1 4 3 2 1 participant
Network
0.5862 0.8795
0.9954
0.9588
0.7142
0.3779
0.9219
0.7088
0.9568
0.1156
0.9786
0.9698
0.5934
0.9966
0.7151
0.6133 1
0.6750 0.9264
0.9945
0.7063
0.5714
0.9966
0.8914
0.6958
0.9770
0.1054
0.9717
0.9924
0.5121
0.9966
0.8494
0.6067 2
0.7457 0.7892
0.9941
0.9963
0.5752
0.9966
0.8911
0.6618
0.9918
0.1360
0.9940
0.9854
0.5087
0.9966
0.7951
0.5724 3
0.5615 0.2876
0.8325
0.6240
0.6511
0.0802
0.8487
0.6742
0.7460
0.0986
0.8571
0.8333
0.5630
0.9698
0.8405
0.6298 4
0.4062 0.7625
0.9953
0.5018
0.5169
0.2508
0.8826
0.6703
0.9473
0.1190
0.9664
0.9673
0.3984
0.9799
0.7337
0.4943 5
0.4112 0.9197
0.9611
0.5114
0.5804
0.3846
0.8971
0.6370
0.9606
0.1156
0.9942
0.9742
0.3529
0.9966
0.7751
0.4644 6
