1. IEEE 802 Wireless Coexistence Study Group Update
1 July 2018
doc.: IEEE COEX-02/015
May 2002
IEEE 802 Wireless Coexistence Study Group Update
Jim Lansford
(405)
Sydney Interim Meeting
Monday evening
Jim Lansford, Mobilian Corporation
Jim Lansford, Mobilian

2. Update for Sydney meeting
May 2002
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
Meets Monday 6:30 (w/TG2),
Jim Lansford, Mobilian Corporation

3. Tasks the SG/TAG needs to accomplish
May 2002
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. May 2002
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
1 July 2018
doc.: IEEE COEX-02/015
May 2002
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
Jim Lansford, Mobilian

6. Q&A #1 Will this group try to “quantify” coexistence?
May 2002
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?
May 2002
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?
May 2002
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. Proposed Operation May 2002
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 )
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