Transcript 19-05-0008-00-0000-reflections-on-TGn-developments-and-proposals-for-802.19.ppt

Month Year
doc.: IEEE 802.19-05-0008-00-0000
[Reflections on TGn Development and
Proposals for 802.19]
Date: 2005-03-07
Authors:
Name
Company
Changwen Liu
Intel
Adrian Stephens
Intel
Barry O'Mahony
Intel
Address
Phone
email
503-264-9262
[email protected]
[email protected]
om
[email protected]
m
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Submission
Slide 1
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Abstract
This presentation presents our observations and
reflections on TGn development process and our
suggestions on 802.19 development.
Submission
Slide 2
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Our Observations on TGn Development
• Have a well-thought procedure to follow
– Adopt Usage Models for the IEEE 802.11n amendment
– Adopt Channel Models corresponding to the usage models that
may be used for evaluation of proposals.
– Adopt Functional Requirements that must be met by all complete
proposals.
– Adopt Comparison Criteria that must be address by all proposals
– …
Submission
Slide 3
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Proposals for .19
• In a CA document, require the following:
– A definition of usage cases considering reasonable victim and
interferer devices
– A definition of metrics establishing the impact of interferer on
victim
– An assessment showing this impact is reasonable
Submission
Slide 4
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Our Observations on TGnSync Simulation
Methodology
• Many required behaviors are not fully defined by specs
and different heuristics for them in simulation have big
impacts on the end results
– E.g. scheduling, retry behavior
• Simulation results are sensitive to simulation parameters
– E.g. TCP result is sensitive to buffer sizes.
• Different implementations of the same protocol results in
very different performances.
Submission
Slide 5
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Lessons Learned – Conclusions
• We are fooling ourselves if we believe a system
simulation gives a precise result
– Two different system simulations of the same protocol may yield
very different results
• We can afford to make considered simplifications to
avoid:
– Needing to create expensive system simulation models
– Needing to validate heuristics of protocols we have no expertise in
• We need powerful analytical models
– Call to arms!
Submission
Slide 6
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
A Proposed Plan for TGn CA Document
• Create coexistence usage cases and define relevant
metrics
• Create analytical models for interference modeling
– Rely .19 to provide analytical model behavior of non TGn systems
• Perform simulation
– Extend system-level simulator for interference modeling and
collaborate results with these from analytic methodology
• Measure testbed results for interference
– Depends on the availability of prototype equipment
• Produce Assessment of impact
Submission
Slide 7
Changwen Liu et al, Intel
Month Year
doc.: IEEE 802.19-05-0008-00-0000
Summary
• It is unrealistic to expect system-level simulations as a
basis of CA results
• It will be necessary for .19 to provide (or make
available) analytical models of “other” systems for use
in a CA analysis
Submission
Slide 8
Changwen Liu et al, Intel