Enterprise Simulation Scenario September 2006 doc.: IEEE 802.11-06/1458r0 Sept. 2009 Enterprise Simulation Scenario Date: 2009-09-08 Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.

Improvements to the enterprise simulation scenario September 2006 doc.: IEEE 802.11-06/1458r0 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 Key Line We solicit doubts and questions so as to bring an improved motion in Hawaii that changes to the Note. Hart (Cisco Systems) Summary Joonsuk Kim, Broadcom Corp.

There are only five or six 80 MHz channels September 2006 doc.: IEEE 802.11-06/1458r0 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: Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.

So we expect two overlapping BSSs September 2006 doc.: IEEE 802.11-06/1458r0 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 Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.

Proposal: let’s allow comparability in OBSS behavior September 2006 doc.: IEEE 802.11-06/1458r0 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 The simplest proposal is to triplicate the APs and clients in scenario #4, keep the first copy at (0,0), translate the second copy by (20,40) and translate the third copy by (-20,-40)m Note: multiple APs is more in harmony with Usage Model 2d in 09/161r2 Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.

Proposed Motion Change the Note in section 4.4 of 09/451 as follows: September 2006 doc.: IEEE 802.11-06/1458r0 Sept. 2009 Proposed Motion Change the Note in section 4.4 of 09/451 as follows: E.g. Note) It is encouraged that TGac technology proposals describe its impact on OBSS. The recommended simulation scenario is the Enterprise Simulation Scenario with the BSS triplicated then each copy translated by (0,0), (20,40) and (-20,-40)m Y, N, A Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.

Soliciting Doubts and Questions September 2006 doc.: IEEE 802.11-06/1458r0 Sept. 2009 Soliciting Doubts and Questions ? Hart (Cisco Systems) Joonsuk Kim, Broadcom Corp.