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Optimum Parameters for VoIP in IEEE 802.11e Wireless LAN. APAN Network Research Workshop 2007 August 27 th , 2007 Sheraton Xi’an Hotel, China Ryo Kitahara (NTT DoCoMo) Koichiro Doi, Tomoya Iinuma, Shingo Morita, Shigeki Goto (Waseda Univ.). Table of Contents. Introduction and Motivation - PowerPoint PPT Presentation
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27th Aug, 2007 Netwrok Research Workshop 2007 1
Optimum Parameters for VoIP in IEEE 802.11e Wireless LAN
APAN Network Research Workshop 2007August 27th, 2007
Sheraton Xi’an Hotel, China
Ryo Kitahara (NTT DoCoMo)Koichiro Doi, Tomoya Iinuma, Shingo Morita, Shigeki Goto (Waseda Univ.)
Netwrok Research Workshop 2007 227th Aug, 2007
Table of Contents
1. Introduction and MotivationIssues on 802.11e and its early studies
2. Feature of 802.11eQoS mechanism
3. ExperimentsTo confirm effectiveness of 802.11e
To seek optimum parameter set
4. Summary and Future Plans
Netwrok Research Workshop 2007 327th Aug, 2007
1. Introduction and Motivation
Netwrok Research Workshop 2007 427th Aug, 2007
Introduction
Deployments as network infrastructure Home and office LAN Public internet access e.g. airport and railway station AP sharing services such as FON
Applications over 802.11 Non-realtime: WWW, E-mail, short message Realtime: Video streaming, IP telephony (VoIP)
QoS functions i.e. 802.11e has been introduced.
Netwrok Research Workshop 2007 527th Aug, 2007
Motivation
Issues on 802.11e A few parameters to set
AIFS, CW, TXOP Not always suitable for each application
Default parameter set depends on manufacturers’ implementation. A lot of early studies to resolve issues and improve packet-level
QoS.
Our approach Seek optimum parameter set from the perspective of user-level
QoS. By 3 kinds of experiments with working test-beds
Netwrok Research Workshop 2007 627th Aug, 2007
2. Feature of 802.11e
Netwrok Research Workshop 2007 727th Aug, 2007
What is IEEE 802.11e ?
An Extension to IEEE 802.11 a/b/g Quality of Service Enhancement
QoS Guarantee HCCF – rarely implemented
QoS Classification EDCA – common implementation of “IEEE 802.11
e enabled” Access Points
Netwrok Research Workshop 2007 827th Aug, 2007
EDCA – MAC layer behavior
MAC behaviorEnhanced CSMA/CA
AIFS CW TXOP
Netwrok Research Workshop 2007 927th Aug, 2007
EDCA – parameters
AIFS CW TXOP
AC_VO
AC_VI
AC_BE
AC_BK
Parameters
Prio
rity
HIG
HL
OW
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3. Experiments
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3 Kinds of Experiments
Actual environment 3 wireless nodes of PC
I. Default parameters
II. Altered parameters
Computer simulation Up to 12 virtual wireless nodes
III. Various parameter sets of AIFS, CW, TXOP
Netwrok Research Workshop 2007 1227th Aug, 2007
Default Setting Performance
EDCA Effectiveness over AC_VO Traffic
23.5
77
0
10
20
30
40
50
60
70
80
90
EDCA OFF EDCA ON
R v
alueBackground
×2VoIP (AC_VO)
46.5pt
Netwrok Research Workshop 2007 1327th Aug, 2007
Altered settings performance 1 Change the parameters independently
CW size
AIFS
TXOP
Netwrok Research Workshop 2007 1427th Aug, 2007
Altered Settings Performance 2 Gained better performance
Netwrok Research Workshop 2007 1527th Aug, 2007
3 Kinds of Experiments
Actual environment 3 wireless nodes of PC
I. Default parameters
II. Altered parameters
Computer simulation Up to 12 virtual wireless nodes
III. Various parameter sets of CW and TXOP
Netwrok Research Workshop 2007 1627th Aug, 2007
Simulation Setup
Bi-directionalVoIP flows
C11
S11 Desmo-J (General-purpose library)
Fixed nodes: up to 12
Wireless nodes: up to 12
PHY Layer: [email protected]
VoIP flows in each direction: up to 12
Payload size: 160bytes
Queue length for EDCA: 200 frames
Netwrok Research Workshop 2007 1727th Aug, 2007
Simulation Resutls – CW size and TXOP
CW size TXOP
Change the parameters independently
Netwrok Research Workshop 2007 1827th Aug, 2007
Simulation Resutls – CW size (Up and Down)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
2731
_127
63_1
27
63_2
5512
7_25
5
255_
511
511_
1023
1023
_204
73_73_15
3_31
7_317_63
15_63
15_12731_127
63_127
63_255127_255
255_511
511_10231023_2047
CwMin_CwMax(Down)
CwMin_CwMax(Up)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
73_7
3_15
3_31
7_31
7_63
15_63
15_127
31_127
63_127
63_255
127_255
255_511
511_1023
1023_2047
CwMin_CwMax(Down)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
73_7
3_15
3_31
7_31
7_63
15_63
15_127
31_127
63_127
63_255
127_255
255_511
511_1023
1023_2047
CwMin_CwMax(Down)
CwMin_CwMax(Up)
90-100 90-100 85-90
75-9075-80 50-55
45-50
5-10
30-35
80-90
70-8050-6040-5030-40
0-10
80-90
70-80
0-10
40-50
10 pair 11 pair 12 pair
Netwrok Research Workshop 2007 1927th Aug, 2007
Simulation Results –TXOPlimit
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
765535_0
65535_816
65535_3264
65535_8160
65535_13056
65535_20400
65535_32640
65535_48960
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
765535_0
65535_816
65535_3264
65535_8160
65535_13056
65535_20400
65535_32640
65535_48960
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
765535_0
65535_816
65535_3264
65535_8160
65535_13056
65535_20400
65535_32640
65535_48960
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
70_65535
816_63335
3264_65535
8160_65535
13056_65535
20400_65535
32640_65535
48960_65535
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)
3_7
3_1
5
3_3
1
7_3
1
7_6
3
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_2
55
255_5
11
511_1
023
1023_2
0470_65535
816_63335
3264_65535
8160_65535
13056_65535
20400_65535
32640_65535
48960_65535
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
70_65535
816_63335
3264_65535
8160_65535
13056_65535
20400_65535
32640_65535
48960_65535
65535_65535
CwMin_CwMax
Txop(Down)_Txop(Up)Down
Up10 pair 11 pair 12 pair
90-10080-9070-80
50-60
60-70
0-10
10-20
30-40
90-100 90-100
90-10080-90
70-80
40-50
50-60
50-60
40-50
85-90
80-8575-8065-70
35-40
50-55
45-50
30-40
10-20
Netwrok Research Workshop 2007 2027th Aug, 2007
Simulation Results – CW size and TXOPlimit
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
70_0
816_816
3264_3264
8160_8160
13056_13056
20400_20400
32640_32640
48960_48960
65535_65535
CwMin_CwMax
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
70_0
816_816
3264_3264
8160_8160
13056_13056
20400_20400
32640_32640
48960_48960
65535_65535
CwMin_CwMax
90- 10080- 9070- 8060- 7050- 6040- 5030- 4020- 3010- 200- 10
3_7
3_15
3_31
7_31
7_63
15_6
3
15_1
27
31_1
27
63_1
27
63_2
55
127_
255
255_
511
511_
1023
1023
_204
70_0
816_816
3264_3264
8160_8160
13056_13056
20400_20400
32640_32640
48960_48960
65535_65535
CwMin_CwMax
10 pairs 12 pairs
11 pairs
90-10080-9070-80
50-6060-700
-10
10-20
30-40 50-60
50-60
90-100
60-70
80-90
30-400
-10
10-20
80-9070-8060-70
40-50
30-40
0-10
10-20
Netwrok Research Workshop 2007 2127th Aug, 2007
4. Summary and Future Plans
Netwrok Research Workshop 2007 2227th Aug, 2007
Summary and Future Plans
Summary 3 kinds of experiments showed that;
Effectiveness of EDCA Tendency of optimal parameter sets for VoIP
Future plans Seeking optimal parameter sets for traffic mixed with r
eal-time and non real-time Development of algorithmic or parameter-tuning meth
od to change parameters adaptively
Netwrok Research Workshop 2007 2327th Aug, 2007
Thank you for your attention!!
Q & A
Netwrok Research Workshop 2007 2427th Aug, 2007
Contact
Ryo Kitahara ([email protected])Service & Solution Development Department
NTT DoCoMo, Inc.
Netwrok Research Workshop 2007 2527th Aug, 2007
Netwrok Research Workshop 2007 2627th Aug, 2007
VoIP: Quality Measurement Issues
Packet-level indicators do NOT necessarily directly reflect voice quality.
R valueVoice quality Established comparison with PSTN phone
qualityEstablished conversion with MOS, another
voice quality indicator
![Analytical Study of TCP Performance over IEEE 802.11e WLANsdaji/papers/monet2008.pdf2.1 IEEE 802.11e EDCA and TXOP The 802.11 DCF [8] does not support service differ-entiation. Basically,](https://img.pdfslide.us/doc/110x75/60b0104627d5601cea74f494/analytical-study-of-tcp-performance-over-ieee-80211e-dajipapersmonet2008pdf.jpg)
![Performance Analysis of IEEE 802.11e EDCA with QoS ......The enhanced distributed channel access (EDCA) protocol of the emerging IEEE 802.11e standard [5] supports access category](https://img.pdfslide.us/doc/110x75/60b0104527d5601cea74f490/performance-analysis-of-ieee-80211e-edca-with-qos-the-enhanced-distributed.jpg)
