July 2010 doc IEEE 802 11 100922 r

July 2010 doc. : IEEE 802. 11 -10/0922 r 0 Achievable gains in AP Discovery Date: 2010 -07 -15 Authors: Submission Slide 1 Marc Emmelmann, FOKUS

July 2010 doc. : IEEE 802. 11 -10/0922 r 0 Abstract Based on the ongoing discussion in FIA SG, there requests were risen to elaborate how all phases being part of an initial link set-up could be shortened. This document presents some initial toughs on improving AP discovery, Submission Slide 2 Marc Emmelmann, FOKUS

July 2010 doc. : IEEE 802. 11 -10/0922 r 0 Network Discovery Reduce number No Assumptions (scan all channels), of channels (to 1) st where APs are Expected Mean (scan all channels), stop after 1 APs known to operate is found find all APs of time spent in scanning for 2. 4 GHz 5 GHz Passive scanning Active scanning 1100 ms 2300 ms 550 ms 1150 ms 100 ms Return after AP Responses (scan 1 channel) Enablement at 5 GHz via 2. 4 GHz 5 GHz 2. 4 GHz 50 ms 5 GHz 50 ms 95% gain 98% gain 60 ms (x) n/a 20 ms (y) Amendment required • • 100 ms 1 st n/a 15 ms n/a 11 k may work, But not for initial link set-up Amendment required 2 ms Amendment required n/a 2 + ε ms 2 ms 97% gain 99% gain Amendment required (x)= ca. 60 ms (rough guess, depends on deployment, i. e. on probability that there is at least one AP on a given channel) (y) = ca. 20 ms ms (rough guess, depends on deployment, i. e. on probability that there is at least one AP on a given channel) Submission Slide 3 Marc Emmelmann, FOKUS

July 2010 doc. : IEEE 802. 11 -10/0922 r 0 References Submission Slide 4 Marc Emmelmann, FOKUS