1. A Comment on Black-Box adaptation for simulation methodology
January 2002
doc.: IEEE /xxxr0
March 2004
A Comment on Black-Box adaptation for simulation methodology
Adrian P Stephens
Intel Corporation
Adrian Stephens, Intel Corporation
John Doe, His Company

2. The universe of possible adaptation mechanisms
March 2004
The universe of possible adaptation mechanisms
The universe of possible n solutions includes:
ABL
MIMO: Open-loop & SVD
Varying rates of adaptation
Fast (per-exchange)
Slow (multiple exchanges, statistical analysis, long processing time)
+ other’s this author is not aware of
Adrian Stephens, Intel Corporation

3. Why is adaptation important?
March 2004
Why is adaptation important?
It is our “job” to use radio resources effectively
Current a/g systems adapt using heuristics based on inaccurate observables (e.g. PER). Current systems find it easy to “adapt down” but harder to “adapt up”
This author expects all proposals will include some method to make adaptation to the channel explicit
Adrian Stephens, Intel Corporation

4. How does adaptation work?
January 2002
doc.: IEEE /xxxr0
March 2004
How does adaptation work?
Adaptation algorithms respond to observed events and retained state:
Instantaneous Channel State observations
Averaged Channel State
Interference environment
Statistics of power level vs periodicity
Long term per STA PER
Previous packet PER, BER, quality
Adrian Stephens, Intel Corporation
John Doe, His Company

5. March 2004
The problem of bias
This author cannot see how the Black-box proposal could support the universe of reasonable adaptation n solutions without introducing much of the complexity of the MAC simulation into it – thereby rendering it useless as a simplification and undefined as a standard interface
Therefore I see that making this proposal a mandatory requirement of n introduces bias because it does not permit a reasonable class of solutions to be proposed
It is our duty to consider all reasonable solutions without introducing bias in our process
Adrian Stephens, Intel Corporation

6. March 2004
Conclusion
In the view of the author, attempting to standardize a mandatory MAC-PHY simulation interface that attempts to include the effect of link adaptation mechanisms would introduce bias into our selection process and is therefore counter to our policies and procedures
Adrian Stephens, Intel Corporation