Introducing a New Product

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ENSC 835 COMMUNICATION NETWORKS CMPT 885
SPECIAL TOPICS COMMUNICATION NETWORKS FINAL
PROJECT PRESENTATION Spring 2008 Deployment of
Mobile and Fixed Video Conferencing over an
Existing IP Infrastructure Victor
Gusev http//www.sfu.ca/vga9/ensc835.htm vga9_at_sfu
.ca
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Roadmap

• Introduction
• Related Work
• Problem Description
• Models
• Simulation Study
• Results and Discussions
• Conclusions and Future Improvements
• References

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Motivation and Overview

• Use already existing IP infrastructure
• Minimal deployment cost
• Video conferencing deployment not yet analysed
  for WiFi in OPNET
• Commercial interest (simulate before investing
  time and money into hardware/software setup)?
• Research interest (optimization, capacity)?

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Introduction (continues)?

• Typical scenario plant/warehouse floor
  (wireless), and office floor (desktops)?
• Plant maintenance (chemical, power)?
• Personnel with PDAs reporting to office
• Production environment
• Warehouse, equipment maintenance, report to
  office
• Office with 2 floors
• Mix of wireless clients and desktops
• Existing standards 802.11a/b/g, 802.11e, 802.11n
• This project concentrates on the most popular
  deployed hardware 802.11b and 802.11g, installed
  on one floor and wired workstations on the second
  floor

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Related Work

• X. Cao, G. Bai, and C. Williamson, Media
  streaming performance in a portable wireless
  classroom network

• Ad-hoc 802.11b testbed
• 400 kbps video
• 128 kbps audio
• Demonstrates that up to 8 clients can be supported

3 X. Cao, G. Bai, and C. Williamson, Media
streaming performance in a portable wireless
classroom network, in Proceedings of the IASTED
European Workshop on Internet Multimedia Systems
and Applications (EuroIMSA), Feb. 2005, pp.
246252.
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Related Work

• Salah, K., and Alkhoraidly, A., An Opnet-based
  Simulation Approach for Deploying VoIP
• VoIP parameters
• Chooses G.711

2 K. Salah and A. Alkhoraidly, An OPNET-based
Simulation Approach for Deploying VoIP,
International Journal of Network Management, vol.
16, no. 3, May 2006, pp. 149-183.
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Related Work

• 1 K. Salah, Analytic approach for deploying
  desktop videoconferencing, IEE Proceedings
  Communications, vol. 153, no. 3, June 2006, pp.
  434444.

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Problem Description Technical Details

• Want to extend existing desktop conferencing
  simulation 1 to include wireless links
• Previously simulated capacity using 100BaseT must
  be larger than our WLAN's capacity
• WLAN becomes a bottleneck
• Want to examine throughput, drop rate, delay,
  number of supported clients
• Compare 802.11b, 802.11g in a typical environment
  with a mix of desktop and mobile clients

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Model Typical Office Environment
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Model Typical Office with Wireless Clients

• Floor 1 Plant/warehouse floor with equipment
• Floor 2 Office, dispatch
• Examples
• UPS, CanadaPost
• Manufacturing, chemical, power and other plants
• Enable interactive voice or video call to report
  to the main office or between personnel

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Choice of parameters H.323

• Widely implemented by voice and videoconferencing
  equipment manufacturers
• Used within various Internet real-time
  applications (i.e. GnuGK, NetMeeting and
  X-Meeting)?
• Deployed worldwide by service providers and
  enterprises for voice and video services over IP
  networks.
• H.323s strength multimedia communication
  functionality designed specifically for IP
  networks.

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Choice of parameters G.711

• Popular audio encoder scheme
• Payload of VoIP 160
• OPNET uses 32 voice samples, 8 bits each
• Set Voice frames per packet 5

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Scenarios

• Scenario 1 802.11b (OPNET), increasing calls
  model
• Scenario 2 802.11g (OPNET), increasing calls
  model
• Scenario 3 802.11b verification (IT Guru)?
• All 3 scenarios have 2 floors (wireless and
  wired)?

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Scenario 1 802.11b Global pps

• IP background traffic starts at 40s, VConf at 70s
• Tx/Rx pps mismatch at 1m 38s

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Scenario 1 802.11b

• Wireless LANs Dropped data (bits/s), Delay (s)
  and Media access delay (s)?

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Scenario 1 802.11b

• Wireless LANs Queue Size (packets)?

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Scenario1 Discussion

• Video conferencing calls supported
• Traffic Rx/Tx Mismatch at 1m 38s, good at 1m 36s.
• Started with 2 video packets at 70s
• Added 2 new calls every 2 seconds
• Hence
• 2calls 2calls((1m 60s/m 36s 70s)/2s)
  28 videoconferencing calls

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Scenario 1 802.11b

• Wireless LANs Load, Throughput and Data Dropped
  (bits/s)?

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Scenario1 Discussion

• 802.11b reaches the typical throughput of 6 Mbps
  (max theoretical rate is 11Mbps)?
• Due to the CSMA/CA protocol overhead, the actual
  throughput is 4.3-5.9 Mbps (TCP) and 7.1 (UDP)
  Mbps.

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Scenario 2 802.11g

• Videoconferencing traffic sent/received
  (packets/sec)?

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Scenario 2 802.11g

• Videoconferencing traffic sent/received
  (bytes/sec)?

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Scenario 2 802.11g

• Wireless LANs Data Dropped (bits/s), Queue size
  (packets)?

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Scenario 2 Discussion

• Video conferencing calls supported
• Traffic Rx/Tx Mismatch at 2m 48s, good at 2m 46s.
• Started with 2 video packets at 70s
• Added 2 new calls every 2 seconds
• Hence
• 2calls 2calls((2m 60s/m 46s 70s)/2s)
  98 videoconferencing calls

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Scenario 2 802.11g

• Wireless LANs Load, Throughput, Data Dropped
  (bits/s)?

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Scenario 2 Discussion

• The modulation scheme is OFDM with data rates of
  up to 54 Mbit/s
• Higher speeds than 802.11b, higher link capacity
• 802.11g reaches its typical 23 Mbps (note 54
  Mbps is a theoretical limit

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Scenario 3 Further Analysis

• Videoconferencing calls
• First floor 802.11b 28
• First floor 802.11g 98
• Are these the actual number of calls 802.11 can
  support? Careful!
• Each of these calls can be made between the
  clients of the same floor!
• Verify

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Scenario 3 802.11b Throughput

• Verify the validity of Scenario 1
• Used IT Guru for a quicker set of simulations for
  verification purposes
• One server supports all services
• Only one desktop - fixed
• Manually add wireless clients until the packets
  are dropped (in contrast to automatic calls
  increase)?
• Compare results

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Scenario 3 802.11b revisited IT Guru
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Scenario 3 9 wireless, 1 desktop

• Note the mismatch between sent and received VC
  traffic

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Scenario 3 8 wireless, 1 desktop

• Videoconferencing traffic sent received

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Results

• Limit for 802.11b is 9 video calls (all
  wireless)!
• Agrees with X. Caos results (Media streaming
  performance in a portable wireless classroom
  network paper)?
• Similar check can be done for 802.11g

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Conclusions

• This study analyzed a deployment of
  videoconferencing clients over an existing IP
  infrastructure
• Both, inter and intra floor communication was
  taking into account
• 802.11 reached its bandwidth limits before the IP
  network as expected
• Longer simulations would result in IP packet drop
  rate gt 0
• Videoconferencing (inter and intra floor)
  calls
• First floor 802.11b 28
• First floor 802.11g 98

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Future Work

• Compare with 802.11e, 802.11n
• Add wireless to all floors
• Add background wireless traffic
• Add weighted call destinations to limit calls
  within the same floor
• Multiple access points spaced far apart
• Security

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References

• 1 K. Salah, Analytic approach for deploying
  desktop videoconferencing, IEE Proceedings
  Communications, vol. 153, no. 3, June 2006, pp.
  434444.2 K. Salah and A. Alkhoraidly, An
  Opnet-based Simulation Approach for Deploying
  VoIP, International Journal of Network
  Management, vol. 16, no. 3, May 2006, pp.
  149183.3 X. Cao, G. Bai, and C. Williamson,
  Media streaming performance in a portable
  wireless classroom network, in Proceedings of
  the IASTED European Workshop on Internet
  Multimedia Systems and Applications (EuroIMSA),
  Feb. 2005, pp. 246252.4 Y. E. Liu, J. Wang,
  M. Kwok, J. Diamond and M. Toulouse, Capability
  of IEEE 802.11g Networks in Supporting
  Multi-player Online Games, Consumer
  Communications and Networking Conference, Jan.
  2006, pp. 11931198.5 A. Wijesinha, Y. Song,
  M. Krishnan, V. Mathur, J. Ahn, and V.
  Shyamasundar, Throughput measurement for UDP
  traffic in an IEEE 802.11g WLAN, in Proceedings
  of the 6th International Conference on Software
  Engineering, Artificial Intelligence, Networking
  and Parallel/Distributed Computing, 2005 and
  First ACIS International Workshop on
  Self-Assembling Wireless Networks, May 2005, pp.
  220225.