IEEE 802 Wireless Coexistence Study Group

1. IEEE 802 Wireless Coexistence Study Group Jim Lansford Jim.Lansford@mobilian.com Tim Blaney tim@commcepts.net Sydney Interim Meeting Wednesday Afternoon Jim Lansford, Mobilian Corporation

2. Update for Sydney meeting • SEC conference calls held between meetings • Refine mission statement • Discussion of goals for anticipated TAG • Definition of Coexistence • Goals for Sydney meeting • Broader feedback • Further refinement of mission statement and goals • Finalize mission statement and charter • Proposed definition of coexistence • Start work on organization and voting rules • Prep for Vancouver plenary Jim Lansford, Mobilian Corporation

3. Tasks the SG/TAG needs to accomplish • Develop Mission Statement (SG ongoing) • Statement of purpose (Recommend to ExCom how IEEE 802 should address coexistence in existing and future specs) (SG ongoing) • Definition of coexistence (TAG) • Summary of current standards where coexistence is an issue (TAG) • Recommendations to SEC (SG July Plenary) • Summary and report (SG July Plenary) Jim Lansford, Mobilian Corporation

4. Mission Statement (Based on feedback from 1 May conference call) • The IEEE 802 Coexistence Technical Advisory Group (TAG) has the following missions: • The COEX TAG develops and maintains the IEEE 802 policy for establishing coexistence between Standards. • <The COEX TAG develops and maintains guidelines for the communications industry to foster coexistence.> • The COEX TAG evaluates the coexistence issues between IEEE 802 PARs and Draft Standards, and makes recommendations to the IEEE 802 Executive Committee. Jim Lansford, Mobilian Corporation

5. Coexistence Definition • Coexistence: The ability of one system to perform a task in a given shared environment where other systems have an ability to perform their tasks and may or may not be using the same set of rules. • Coexistence is quantified by degradation (simulated or measured) under a set of usage model assumptions, which must be defined for coexisting systems Jim Lansford, Mobilian Corporation

6. Q&A #1 • Will this group try to “quantify” coexistence? • Not likely – coexistence depends on so many variables (geometry, power, etc.) that defining a number that says whether you have achieved it or not isn’t practical. • What will this group do then? • We currently don’t have a policy for addressing coexistence; that’s first. This policy will address the ground rules for analyzing the degradation two systems cause to each other (or pairs of systems for multiple standards). Jim Lansford, Mobilian Corporation

7. Q&A #2 • How would this work? • The TAG first defines policy. For example, the policy might be to say a WG needs to pick five usage models and determine the degradation due to a set of other approved standards, pairwise. We want to examine most likely scenarios, not corner cases, which may give pathological results. • So how would you know if two systems “coexist”? • The TAG is an advisory group to SEC; analysis using the usage models would be used by WGs and SEC to make informed decisions. This is a similar concept to the FCC’s OET. So the answer is that the TAG procedures will either convince voters that a Recommended Practice is needed, or that a draft has no coexistence issues and can proceed to further balloting. Jim Lansford, Mobilian Corporation

8. Q&A #3 • Does the TAG play a role other than formulating policy? • Possibly. The current thinking is that the COEX TAG develops a definition of coexistence and a policy to guide WG’s analysis of coexistence. Beyond that, the TAG may be called upon to help resolve coexistence conflicts by writing an independent report when a draft is submitted to SEC, but this has not been agreed upon. • What about participation and voting? • A TAG is governed by the same attendance and voting rules as WG’s, but the specifics are not finalized. Jim Lansford, Mobilian Corporation

9. Notes from Monday • Minutes: “COEX-02017r0_Coexistence-Meeting-Minutes-Sydney” on Mars • Key points: • Desireable to coordinate with ETSI/BRAN • Discussion of “acceptable” degradation • Several ingredients needed in policy: • PHY model (first order) • MAC model (second order) • Upper layers (third order) • Usage models are critical, and must be agreed upon between affected WG’s Jim Lansford, Mobilian Corporation

10. Proposed Operation (discussion points) • The Coexistence TAG is responsible for defining the meaning of coexistence within the IEEE 802 context. • The Coexistence TAG will develop the guidelines by which WGs establish whether a given TG coexists. • Uses official definition • Uses usage models • Uses modeling and/or measurements • Recommends creation of a TG to develop a Recommended Practice, if needed (a la 802.15.2) • The Coexistence TAG will publish guidelines by which the industry can evaluate coexistence. • The Coexistence TAG is responsible for reviewing all proposed wireless PARs • Like FCC/OET, evaluates PARs and highlights those that may require a Recommended Practice • Summary report to be voted on by TAG • Summary report presented to SEC • SEC members take this summary under advisement • This TAG is responsible for generating a final review report of the Draft Standard prior to Sponsor Ballot • TAG should begin work when the first WG ballot is published • Preliminary report should be issued to SEC within 40 days • Must be voted on by TAG • Must be ratified by SEC • SEC can require creation of a TG to write Recommended Practice Jim Lansford, Mobilian Corporation