1. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 1 MAC Breakdown Update Date: 2009-03-12 Authors:

2. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 2 Abstract This submission provides an update on the MAC breakdown work accomplished during the 2008-12-16 and 2009-01-13 conference calls.

3. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 3 Outline Recap of MAC Component Breakdown WIP BSS Management Analysis for 2008-12-16 Insights from the 2008-12-16 analysis Intro to Functional Analysis WLAN Functional Breakdown Next Steps References References for conf calls F.A.S.T. References

4. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 4 Recap of MAC Component Breakdown work-in-progress (WIP) In previous meetings and conf calls we made progress on construction of a MAC component breakdown. The result after the Nov 2008 meeting: –11-08-1298-01-0arc-MAC-component-breakdown.doc The work continued in two recent conference calls: 2008-12-16 and 2009-01-13. –The agenda for those calls was to continue the incremental work on the MAC component breakdown diagram and descriptions. –The objective was to delve deeper into Block 10, "MLME", on the top level diagram and codify the aspects of the MLME that relate to formation and management of the BSS, including establishment, advertising, discovery and “membership” updates.

5. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 5 BSS Management Analysis for 2008-12-16 http://tinyurl.com/bss-manage-1 This is a hierarchical analysis diagram showing the components of BSS Mgmt, but it highlights the need for a functional breakdown.

6. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 6 Insights from the 2008-12-16 analysis The discussion led to a meta discussion on the nature of the MAC breakdown work since the BSS Management block is difficult to decompose from a component perspective but easy from functional perspective. This is because a component breakdown becomes more complicated as finer levels of detail are sought because state must be indicated and there are always exceptions. Past discussions have revealed that everyone knows how to do component breakdown – the difficulty is that everyone does it differently. This is understandable since the participants come from different backgrounds (e.g. chip mfgr, systems engineer, architect,...), work in different engineering environments, and operate at different levels of analysis and implementation. i.e. the components are arbitrary. A full MAC analysis requires both a component and a functional breakdown. Thus, pursuing a functional breakdown of the MLME block is not counter to the current MAC analysis efforts. In particular, a functional analysis might add insight and meaning to the analysis of BSS Management. Functional analysis leads to a deeper understanding of the reasons behind and the relations between the most important functions. This outcome is aligned the goals of the ARC SC work.

7. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 7 Intro to Functional Analysis Function Analysis Systems Technique (F.A.S.T.) is a formal method of functional analysis. FAST is “a means of explicitly representing something, a means of analyzing a system” Knowing the components, a FAST analysis proceeds by asking a series of WHY, HOW questions to uncover the corresponding functions and the relations between those functions. –The functions are arranged as entries or blocks on a diagram with WHY answers on the left and HOW answers on the right. –Functions are described using simple verb-noun phrases. –Relationship lines connect the functional blocks together in a way that captures the relations between the functions.

8. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 8 FAST Example Lightbulb components: –Filament –Glass bulb –Support wires –Lead-in wires –Heat deflecting disc –Stem –Stem press –Base rim –Insulation –Center contact

9. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 9 FAST Example - Light Bulb Functions Provide Luminous Energy Product Light Convert Energy Heat Filament Prevent Oxidation Confine Filament HOWWHY Exclude Oxygen Supply Power Conduct Current Connect Wires

10. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 10 The Mindomo Tool A mind map is not ideal for drawing FAST diagrams, but it’s close and quick and easy to use, with capable online tool versions available that allow for effective collaborative work efforts. Mindomo is one such mind map tool. See www.mindomo.com

11. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 11 WLAN Functional Breakdown rev 1 http://tinyurl.com/bss-manage-2 This is an analysis diagram in transition to a FAST diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions. HOWWHY

12. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 12 WLAN Functional Breakdown rev 2 This is an analysis diagram in transition to a FAST diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions. HOWWHY

13. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 13 WLAN Functional Breakdown rev 3 This is an analysis diagram in transition to a FAST diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions. HOWWHY

14. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 14 Next Steps Construct a MAC functional breakdown to argument our component level breakdown since ultimately both are needed. –We have the necessary subject matter experts (SMEs). –Functional analysis is well suited to a collaborative team effort. –The functional breakdown will be useful to our ongoing ARC efforts and those of other groups.

15. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 15 Functional Analysis WIP Snapshots 2009-01-22 rev 4 (output) 2009-02-02 (input) 2009-02-03 (output) 2009-02-16 (input) 2009-02-17 (output)

16. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 16 WLAN Functional Breakdown rev 20090122 This is a FAST functional n analysis diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions. HOWWHY

17. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 17 WLAN Functional Breakdown rev 20090202 This is a FAST functional n analysis diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions.

18. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 18 WLAN Functional Breakdown rev 20090203 This is a FAST functional n analysis diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions.

19. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 19 WLAN Functional Breakdown rev 20090216 This is a FAST functional n analysis diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions.

20. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 20 WLAN Functional Breakdown rev 20090217 This is a FAST functional n analysis diagram, beginning to examine the underlying functions of the MAC and the relationships between those functions. http://tinyurl.com/ARC-SC-MAC-func-20090217-png

21. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 21 References 1. IEEE Std. 802.11-2007 –Cl. 5 General Description 5.2.5 Integration with non-802.11 LANs Figure 5.6 Connecting to other IEEE 802 LANs [shows portal] –Annex N AP Functional Description Figure N.4 High-level UML entity diagram for the WLAN system Figure N.5 AP UML composition diagram (alternate syntax) 2. 11-04-1225-08 AP Function Summary 3. 11-08-0496-01-000v-merged-access-unit-framework.ppt, Engwer, April 2008 4. 11-05-1606-00-0apf-ap-functions-diagram.ppt, Engwer, Jan 2005 5. 11-08-0867-01-0arc-MAC-Component-Breakdown-Topics-for- Discussion.ppt 6. 11-08-0869-00-0arc-minutes-arc-sc-July-2008.doc 7. 11-08-0949-04-0arc-MAC-Component-Breakdown-WIP.ppt 8. 11-08-1298-01-0arc-MAC-component-breakdown.doc

22. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 22 References for 2008-12-16  2009-03-03 conference calls 2008-12-16: –JPG image of MLME component breakdown of BSS Management http://tinyurl.com/bss-manage-1 2009-01-13: –JPG image of WLAN functional breakdown map rev1 2009-01-12 http://tinyurl.com/bss-manage-2 –Mindomo map of WLAN functional breakdown http://tinyurl.com/7eksy2 2009-02-03: –TBD 2009-02-17: –PNG image of WLAN functional breakdown map 20090217 http://tinyurl.com/ARC-SC-MAC-func-20090217-png –Mindomo map share link TBD

23. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 23 Function Analysis Systems Technique (F.A.S.T.) References “Function Analysis As A General Design Dicipline”, Dan A. Seni, P.Eng., Ph.D. Professor, Department of the Management of Technology. School of Management, University of Quebec at Montreal, 2004, www.value- eng.org/knowledge_bank/attachments/200441.pdfwww.value- eng.org/knowledge_bank/attachments/200441.pdf “Genesis of FAST”, Charles W. Bytheway, 2005, http://www.value- eng.org/knowledge_bank/attachments/Genesis%20of%20FAST.pdfhttp://www.value- eng.org/knowledge_bank/attachments/Genesis%20of%20FAST.pdf “Function Analysis and Decomposition Using Function Analysis Systems Technique”, Charles W. Bytheway, 1999-06-10, www.osti.gov/bridge/servlets/purl/8929-OkjsUp/native/8929.PDF www.osti.gov/bridge/servlets/purl/8929-OkjsUp/native/8929.PDF “Functional Analysis System Technique (F.A.S.T.) as a Group Knowledge Elicitation Method for Model Building”, J.E. Bartolomei, T. Miller, 2001, http://www.systemdynamics.org/conferences/2001/papers/Bartolomei_2.pdf http://www.systemdynamics.org/conferences/2001/papers/Bartolomei_2.pdf “Value: Its Measurement, Design, and Management”, M. Larry Shillito, David J. De Marle, 1992, (Google Books), http://books.google.com/books?id=e01LfamiCpUC&pg=PA153&lpg=PA153 &dq=charles+bytheway+%22light+bulb%22&source=web&ots=nfrS- 5o7nM&sig=whr5YhytmTz8JnmRqVOnlJbSbxE&hl=en&sa=X&oi=book_res ult&resnum=3&ct=result http://books.google.com/books?id=e01LfamiCpUC&pg=PA153&lpg=PA153 &dq=charles+bytheway+%22light+bulb%22&source=web&ots=nfrS- 5o7nM&sig=whr5YhytmTz8JnmRqVOnlJbSbxE&hl=en&sa=X&oi=book_res ult&resnum=3&ct=result

24. doc.: IEEE 802.11-09/0118r1 Submission March 2009 Darwin Engwer, Nortel NetworksSlide 24 Revisions r0: 2009-01-19 Created. r1: 2009-03-12 Updated with results of 2009-02-03 and 2009-02-17 conf calls.