MAC Component Breakdown Topics for Discussion July 2008 doc.: IEEE 802.11-08/0910r0 July 2008 MAC Component Breakdown Topics for Discussion Date: 2008-07-17 Authors: Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

July 2008 doc.: IEEE 802.11-08/0910r0 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

Outline Problem statement Overload Examples Considerations July 2008 doc.: IEEE 802.11-08/0910r0 July 2008 Outline Problem statement Overload Examples Considerations Possible Solutions Straw Polls Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

July 2008 doc.: IEEE 802.11-08/0910r0 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

Overload Examples measurements diagnostics event logs syslog dump July 2008 doc.: IEEE 802.11-08/0910r0 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

July 2008 doc.: IEEE 802.11-08/0910r0 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

Possible Solutions Add QOS header to MMPDUs July 2008 doc.: IEEE 802.11-08/0910r0 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

Straw Polls Is this an important issue? Y/N Approach preference? July 2008 doc.: IEEE 802.11-08/0910r0 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

References 1. IEEE Std. 802.11-2007 2. P802.11v_D3.0.pdf July 2008 doc.: IEEE 802.11-08/0910r0 July 2008 References 1. IEEE Std. 802.11-2007 2. P802.11v_D3.0.pdf Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

Revisions r0 – 2008-07-17 First presentation to TGv. July 2008 doc.: IEEE 802.11-08/0910r0 July 2008 Revisions r0 – 2008-07-17 First presentation to TGv. Darwin Engwer, Nortel Networks Darwin Engwer, Nortel Networks

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

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