1. MAC Component Breakdown Topics for Discussion
July 2008
doc.: IEEE /0910r0
July 2008
MAC Component Breakdown Topics for Discussion
Date:
Authors:
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

2. July 2008
doc.: IEEE /0910r0
July 2008
Abstract
This presentation introduces some conditions that can lead to network overload due to excessive RRM and/or WNM frames.
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

3. Outline Problem statement Overload Examples Considerations
July 2008
doc.: IEEE /0910r0
July 2008
Outline
Problem statement
Overload Examples
Considerations
Possible Solutions
Straw Polls
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

4. July 2008
doc.: IEEE /0910r0
July 2008
Problem statement
RRM/WNM frames are meant to characterize and help optimize the wireless network.
But, overuse of those frames could itself overwhelm the network to the point of complete failure (due to bandwidth starvation for real data laden frames).
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

5. Overload Examples measurements diagnostics event logs syslog dump
July 2008
doc.: IEEE /0910r0
July 2008
Overload Examples
measurements
diagnostics
event logs
syslog dump
location tracking
Scenarios with great potential for network overload by RRM/WNM frames that can overwhelm real data laden frames.
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

6. July 2008
doc.: IEEE /0910r0
July 2008
Considerations
A specific deployment may constitute a system that ONLY does location tracking, e.g. in a warehouse application, so that might be acceptable.
But, in a normal multi-use network deployment RRM/WNM frames could overwhelm normal data frames. In particular delivery of high priority, time sensitive data like VOIP data frames could be compromised.
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

7. Possible Solutions Add QOS header to MMPDUs
July 2008
doc.: IEEE /0910r0
July 2008
Possible Solutions
Add QOS header to MMPDUs
set lowest priority for RRM/WNM frames
Duty cycle limit RRM/WNM frames
Other?
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

8. Straw Polls Is this an important issue? Y/N Approach preference?
July 2008
doc.: IEEE /0910r0
July 2008
Straw Polls
Is this an important issue? Y/N
Approach preference?
QOS header
Duty cycle limits
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

9. References 1. IEEE Std. 802.11-2007 2. P802.11v_D3.0.pdf July 2008
doc.: IEEE /0910r0
July 2008
References
1. IEEE Std
2. P802.11v_D3.0.pdf
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

10. Revisions r0 – 2008-07-17 First presentation to TGv. July 2008
doc.: IEEE /0910r0
July 2008
Revisions
r0 – First presentation to TGv.
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

11. Backup Slides July 2008 July 2008 doc.: IEEE 802.11-08/0910r0
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks

12. July 2008
doc.: IEEE /0910r0
July 2008
Darwin Engwer, Nortel Networks
Darwin Engwer, Nortel Networks