January 2004 doc IEEE 802 11 040120 r

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January 2004 doc. : IEEE 802. 11 -04/0120 r 2 PHY Abstraction to be

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 PHY Abstraction to be used in MAC simulation B. Jechoux, H. Bonneville Mitsubishi ITE Submission 1 H. Bonneville, B. Jechoux

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 History – Questions raised

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 History – Questions raised in 11 -03 -0888 -02 (Jeff Gilbert) • PHY impairments: currently being fixed in FRCC • PHY abstraction used in MAC: to be addressed – Large consensus in Jan 6 th FRCC telecon for the need of a “unified way of modeling PHY error rate in MAC simulation” Submission 2 H. Bonneville, B. Jechoux

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 PHY Abstraction problem –

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 PHY Abstraction problem – PHY/MAC Interface can drastically impact overall results: • Time varying channel creates time varying PER • Affects overall delay, jitter and goodput – Challenge • Properly model detailed PHY characteristics • Keep flexibility to adapt to various PHYs • Keep simulation effort reasonable Submission 3 H. Bonneville, B. Jechoux

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Benefits – Transparency •

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Benefits – Transparency • Assess MAC simulation result validity • Allow cross checking – Comparability • Fair comparison between System results • Fair comparison between MACs – Merging ability • MAC and PHY from different proposers Submission 4 H. Bonneville, B. Jechoux

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Risks of not specifying

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Risks of not specifying Abstraction – Without common PHY/MAC interface, results could depend more on simulation methodology than proposal. – Possible interpretations: • • Submission Idealized PHY Distance -> fixed PER (based on theoretical values) Distance -> mean SNR (w, w/o interference) -> PER Distance -> fading SNR -> capacity formula -> PER Fully accurate PHY model w/rate adaptation -> PER lookup Approximate PHY based on SNR profile in MAC simulation Full PHY simulation per packet in MAC simulation 5 H. Bonneville, B. Jechoux

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Straw polls – Straw

January 2004 doc. : IEEE 802. 11 -04/0120 r 2 Straw polls – Straw Poll #1: • Do we want a unified way of modeling PHY error rate in MAC/System simulation? – Straw Poll #2: • When must this be completed by? – By the time of the call for proposals – By the session following the call for proposals – The call for proposals should not be issued until this completes (by next session latest) Submission 6 H. Bonneville, B. Jechoux

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