Enterprise Simulation Scenario September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 Enterprise Simulation Scenario Date: 2009-09-17 Brian Hart (Cisco) Hart (Cisco)

Improvements to the enterprise simulation scenario September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 Improvements to the enterprise simulation scenario Situation 11ac has 5 or 6 channels at 5GHz whereas 11n had 12 channels. Overlapping APs are much more likely with 5 or 6 channels. The Functional Requirements and Evaluation Methodology 09/451r7 includes: “Note) It is encouraged that TGac technology proposals describe its impact on OBSS” Complication This Note will lead to un-comparable qualitative comments. In San Francisco we straw-polled a specific change that would modify the Note to make it more quantitative, with results Y34, N0, A30 This is a large number of Abstains During a TGac we solicited doubts and questions re the specific change, and proposed a compromise change in 09/980r0 Key Line We bring the topic to a motion Brian Hart (Cisco) Hart (Cisco)

There are only five or six 80 MHz channels September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 There are only five or six 80 MHz channels There are five 80MHz channels at 5 GHz 36-48, 52-64, 100-112, 116-128, 149-161 Plus a sixth, 132-144, with a regulatory change Typical channel plan with six channels is: Brian Hart (Cisco) Hart (Cisco)

So we expect two overlapping BSSs September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 So we expect two overlapping BSSs APs co-channel with the (0,0) AP are at (-20,-40), (20,40)m [44m range] (-40,40), (40,40)m [57m range] (0,60), (-60,0)m [60m range] Now range with -76dBm CCA (for 80MHz) is 50m: 17dBm + 3dBi - 47dB[1m] - 20log10(5m/1m) - 35log10(50m/5m) = -76dBm With multistorey deployments, 20dBm TX power, 6dBi antennas, cubes, realistic sensitivities, 10 or 20m breakpoint, the actual overlap is worse But let’s assume 2 overlapping BSSs for simplicity Brian Hart (Cisco) Hart (Cisco)

Proposal: let’s allow comparability in OBSS behavior September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 Proposal: let’s allow comparability in OBSS behavior Uplink/downlink MU-MIMO / SDMA and OFDMA are valuable technologies that we should be exploring, yet they are more challenging in an OBSS world We should include OBSS as an “impairment” because otherwise there is a risk we will make suboptimal design choices based on false optimism: i.e. 2 simulation scenarios, with & without OBSS, so they are directly comparable minimize #stations to simulate (33 total) a compromise between homogeneous BSSs versus 1 client in the OBSSs, proposed as 20/5/5 clients for the 3 BSSs 40 MHz 11ac APs are further apart than 80 MHz 11ac APs one OBSS is a legacy 20/40 MHz 11n AP both 11ac BSSs have the same bandwidth (40 or 80) BSS distances are provided Brian Hart (Cisco) Hart (Cisco)

Proposed Motion Motion: September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 Proposed Motion Motion: TGac approves applying the changes in 09/980r1 to 09/451 for the purpose of allowing comparability in OBSS behavior Moved: Seconded: Result: Y/N/A Brian Hart (Cisco) Hart (Cisco)

Soliciting Doubts and Questions September 2009 doc.: IEEE 802.11-09/816r5 Sept. 2009 Soliciting Doubts and Questions ? Brian Hart (Cisco) Hart (Cisco)