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Published on : Feb 24, 2014
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Slide 1 - Challenges In Mesh Networking S. Keshav School of Computer Science University of Waterloo
Slide 2 - Outline Why Mesh? WLAN challenges Mesh challenges Perspective
Slide 3 - Why Mesh? Eliminate cost of wired backhaul Support a mobile workforce Increase coverage at little additional cost …if WiFi is good, then mesh must be better…
Slide 4 - Unfortunately… WiFi is hard, and mesh is harder! We scarcely understand how to do WiFi well…
Slide 5 - Top10 WLAN problems Interference Irregular coverage Dynamic coverage Hidden terminals Exposed terminals Parameter hell RF environment Interference verses transmission range Legacy clients Time synchronization
Slide 6 - 1. Interference Wired  wireless Due to simultaneous reception of two transmissions at the same receiver 4 types AP::AP AP + AP :: client AP + client :: client Client :: client
Slide 7 - 2. Irregular Coverage Source: J. Yeo, M. Youssef, A. Agrawala, Characterizing the 802.11 Traffic: The Wireless Side, UMD Tec. Report (CS-TR-4570)
Slide 8 - 3. Dynamic coverage Source: J. Yeo, M. Youssef, A. Agrawala, Characterizing the 802.11 Traffic: The Wireless Side, UMD Tec. Report (CS-TR-4570)
Slide 9 - 4. Hidden terminal
Slide 10 - 5. Exposed Terminal
Slide 11 - 6. Parameter Hell For each AP, need to select Technology: a, b, g (or n?) Channel: 1 of 3 or 12 Power level: 1 of about 50 Sensitivity: a number from 1 to 90 Security type: WEP, WPA, 802.1x, … Vendor-specific extensions …
Slide 12 - 7. RF environment Source: V. Bahl, Openness and the Public Airwaves, Presentation at MobiHoc 2005
Slide 13 - 8. Interference Verses Transmission Range Transmission range Interference range
Slide 14 - 9. Legacy Clients Can’t assume that you can change all client software even in corporate environments!
Slide 15 - 10. Time Synchronization Any kind of coordination between APs requires microsecond-level synchronization Not easy to achieve
Slide 16 - If You Think WLAN Is Bad…
Slide 17 - Mesh Is Worse! All the problems of WLAN, and also Congestion near gateways Backhaul consumes a channel Hard to give QoS bounds Control and data share channel Delays in control loop Fault diagnosis is hard
Slide 18 - Perspective Our understanding of WLANs and meshes is inadequate Are we biting off more than we can chew by rushing to deployment?
Slide 19 - Perspective After all, there is an alternative!
Slide 20 - Thanks! & Questions?
Slide 21 - © 2006 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
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