1. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 1 Writing a Coexistence Assurance Document Notice: This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEEs name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEEs sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.19. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the TAG of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.19 TAG. If you have questions, contact the IEEE Patent Committee Administrator at.http:// ieee802.org/guides/bylaws/sb-bylaws.pdfpatcom@ieee.org Date: 2009-01-21 Authors:

2. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 2 Abstract A coexistence assurance (CA) document shows how well two wireless networks This presentation provides an overview of how to write a CA document

3. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 3 Steps in Writing a CA Document 1.Specify a set of coexistence scenarios 2.Specify a set of coexistence metrics 3.Compute the value of the coexistence metrics 4.Draft the CA document 5.Review of CA document by 802.19 TAG (formal or informal)

4. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 4 Coexistence Scenarios A coexistence scenario specifies the following items –What networks are present –Physical geometry of devices –Type of network traffic on each network –Type of usage in each network (downloading data, voice or video traffic, etc.) –Description of physical scenario including whether it is indoor, outdoors, between walls, etc. –Any other specifications to describe the scenario

5. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 5 Coexistence Metrics A coexistence metric is something you measure to evaluate how well two (or more) networks coexist The specific coexistence metrics are typically a function of how the network is being used –Change in mean throughput when second network is present versus no other network being present –Change in latency –Packet error rate –Distance between network at which packet error rate reaches a specified threshold –Etc.

6. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 6 Coexistence Metrics Coexistence network are to be provided on both networks Let us say there are two networks –Network A –Network B Some metrics will measure the impact of Network A on Network B Others will measure the impact of Network B on Network A These metrics may be the same or may be different, most likely based on the use of each network

7. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 7 Computing Value of Coexistence Metrics There are multiple methods of computing the value of the coexistence metrics –Simulations –Analytical Models –Hybrid Simulation/Analysis Typically the coexistence metrics are plotted as a function of an independent parameter –Network separation –Network traffic loading –Etc.

8. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 8 Drafting a CA Document The WG (or TG) prepares a document including –Description of the scenarios –Description of the coexistence metrics –Description of simulation/analysis method –Simulation/Analysis results showing value of the coexistence metrics as a function of various independent parameters –Conclusions about the coexistence of the two networks –Possible recommendations about under what conditions the two networks coexist well and when the coexist poorly

9. doc.: IEEE 802.19-09/0001r0 Submission January 2009 Steve Shellhammer, QualcommSlide 9 Working with the 802.19 TAG The WG is encouraged to work with the 802.19 TAG Prior to WG Letter Ballot –Schedule joint meeting with TAG to discuss coexistence scenarios, metric, methods of calculations –Provide early versions of CA document to TAG for review During WG Letter Ballot –CA document is to be provide with draft to entire ballot pool and 802.19 TAG –TAG will provide comments back to WG on CA document