IEEE 802.11ae Prioritization Scheme Overview
Explore the introduction of IEEE 802.11ae and its prioritization scheme for management frames. Understand the amendments, history, and rationale behind the development of this standard to enhance wireless LAN management traffic efficiency in dense deployments.
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September 2015 doc.: IEEE 802.11-14/1013r1 802.11ae & 802.11ax Date: 2015-08-25 Authors: Name Guido R. Hiertz Affiliations Address Ericsson Phone +49-2407- 575-5575 email hiertz@ieee.org Ericsson Allee 1 52134 Herzogenrath Germany F r gatan 6 Stockholm Sweden filip.mestanov@ericsson.c om Filip Mestanov Ericsson +46-725-298- 161 mmontemurro@blackberr y.com Michael Montemurro BlackBerry Ltd 4701 Tahoe Blvd +1-289-261- 4183 Mississauga, ON CANADA L4W 0B4 170 W Tasman Dr, San Jose, CA 95134, USA Brian Hart Cisco Systems +1-408- 5253346 brianh@cisco.com Submission Slide 1 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Abstract 802.11ae introduces a prioritization scheme for management frame. Submission [7] proposes to mandate support for 802.11ae with 802.11ax. The submission was presented during the July 2015 meeting but attendees asked for more time to review the principles of 802.11ae. The present submission intends to provide further explanations about 802.11ae. Submission Slide 2 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 IEEE 802.11ae-2012 IEEE 802.11ae-2012 [2] is the first amendment of IEEE 802.11-2012 IEEE 802.11ae describes Prioritization of Management Frames The amendment consists of a grand total of 52 pages 38 pages of normative text The PAR was approved 2009-12-09 The final amendment was approved 2012-03-01 The project had five Letter Ballots and four Sponsor Ballots The first draft had 81% approval rate and the final draft 100% approval rate without any non-satisfied comments remaining [1] Submission Slide 3 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 History Because the first 802.11 letter ballot received >75% approval rate, the ballot group was closed [3] contains the list of voters LB181 is the last 802.11 letter ballot on P802.11ae 182 affirmative votes 7 negative votes 35 abstention votes Negative votes must be accompanied by comments, the latter are documented in [4] Zero comments in LB181, last comments in LB180 A total of eight 802.11 voting members provided comments Submission Slide 4 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Why 802.11ae? The 802.11ae press release [5] explains Wireless LANs increasingly carry more management traffic. Management traffic is currently transmitted at a single priority that is higher than most data traffic. Without 802.11ae, all management frames use highest Access Category (Voice, AC VO) parameters Not necessarily queued with Data frames Not all management frames need high priority handling Previous studies reveal that management traffic is severe in dense deployments [6] Submission Slide 5 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Management frame traffic problem Various contributions outline that in dense deployments 60% or more can be management traffic Many management frames are sent at the most robust Modulation and Coding Scheme (MCS) 1 Mb/s @ 2.4 GHz, 6 Mb/s @ 5 GHz Substantial airtime killer Access Category Voice (AC_VO) uses very aggressive default settings AIFSN = 2, CWmin = 3, CWmax = 7 Management frames severely impact VoIP transmissions Threatening market opportunity for Wi-Fi calling Submission Slide 6 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 What is 802.11ae? The 802.11ae press release [5] explains This amendment defines a new mechanism for the prioritization of management frames and a protocol to communicate management frame prioritization policy. The new protocol allows IEEE 802.11 devices to define and communicate a local management frame prioritization policy for the Wireless LAN. The mechanism allows IEEE 802.11 devices to prioritize management frames against other management and data traffic. [ ] IEEE 802.11ae allows devices to communicate a prioritization policy for management frames, and a mechanism for transmitting management frames at different priorities according to that policy. Submission Slide 7 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Default QMF policy (1) Group addressed (Broadcast) Probe requests are assigned to the Best Effort category Individually addressed Probe requests remain in AC_VO Submission Slide 8 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Default QMF policy (2) Mobility related management frames remain in AC_VO Enable timely handling Submission Slide 9 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Summary A management frame prioritization policy can be locally adjusted However, there is no requirement for an AP to use this mechanism Implementation of 802.11ae requires little (high level) changes 802.11ae prevents overloading the highest priority The default table covers most aspects Time critical management frames remain in AC_VO Submission Slide 10 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 STRAW POLL Submission Slide 11 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Straw Poll Do you agree to add the following to the IEEE 802.11 TGax Specification Framework? Add to the end of Clause 6 (MAC): The amendment shall define a HE STA to be a QMF STA. Submission Slide 12 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Transform successful straw poll into a motion MOTION Submission Slide 13 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 Motion Moved to add to the end of Clause 6 (MAC) of the IEEE 802.11 TGax Specification Framework: The amendment shall define a HE STA to be a QMF STA. Moved by: Seconded: Submission Slide 14 Guido R. Hiertz et al., Ericsson
September 2015 doc.: IEEE 802.11-14/1013r1 References 1. M. Montemurro and B. Kramer, P802.11ae report to EC on in support of approval to proceed to RevCom, Jan. 2012. [Online]. Available: https://mentor.ieee.org/802.11/dcn/12/11-12-0030 IEEE, IEEE Standard for Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications Amendment 1: Prioritization of Management Frames, Apr. 2012. [Online]. Available: http://standards.ieee.org/getieee802/download/802.11ae-2012.pdf Voters List for Recirculation Letter Ballot 181 (TGae Draft 5.0) And previous Ballots: 169, 172, 176 and 180, [Online]. Available: http://www.ieee802.org/11/LetterBallots/LB181ae/LB181_voters_list.xls M. Montemurro, TGae LB180 Comment Resolutions, Jun. 2011. [Online]. Available: https://mentor.ieee.org/802.11/dcn/11/11-11-0888 B. Kramer and M. Montemurro, P802.11ae Press Release, Apr. 2012. [Online]. Available: https://mentor.ieee.org/802.11/dcn/12/11-12-0478 K. Yunoki et al., Understanding Current Situation of Public Wi-Fi Usage Possible Requirements for HEW, [Online]. Available: https://mentor.ieee.org/802.11/dcn/13/11-13-0523 G. R. Hiertz et al., Efficiency enhancement for 802.11ax, Jul. 2015. [Online]. Available: https://mentor.ieee.org/802.11/dcn/15/11-15-0871 2. 3. 4. 5. 6. 7. Submission Slide 15 Guido R. Hiertz et al., Ericsson
