July 2012 doc IEEE 802 11 -12 936

July 2012 doc. : IEEE 802. 11 -12/936 r 0 Review of Overlapping 802. 11 Networks (OBSS) Status and IEEE 802. 11 Solutions Authors: Submission Date: 2012 -07 -18 Slide 1 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • Wi. Fi Market penetration figures – Wi. Fi accounts for an increasing portion of total network access • 36% in 2010 to a forecasted 46% in 2015 – More than 37% of mobile phone traffic and more than 90% of tablet traffic is already transported over Wi-Fi in the US. [Source: Wired, Wi-Fi and mobile traffic volume in 2010 and 2015. Source: Cisco Visual Networking Index (VNI), www. cisco. com] [Source: Wi. Fi certified passpoint - white paper – Feb 2012] [Source: Com. Score, “Digital Omnivores: How Tablets, Smartphones and Connected Devices are Changing U. S. Digital Media Consumption Habits”, 2011] Submission Slide 2 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • Wi. Fi Market penetration figures – In many countries more than 50% of households use 802. 11 [Source: http: //recombu. com/digital/news/almost-three-quarters-of-british-homes-have-a-wifi-network_M 10255. html] Submission Slide 3 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • Wi. Fi Market penetration figures – Number of Wi. Fi networks increasing every day … Daily Number of Wi. Fi Networks Total Number of Wi. Fi Networks [Source: http: //wigle. net/gps/main ] Submission Slide 4 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • 802. 11 Available Channels Channelization for US [Source: Robert Stacey et al. , “Specification Framework for TGac”, IEEE 802. 11 -09/0992 r 18, Sep. 2010] Channelization for Europe, Japan [Source: S. Merlin et al. , “CCA for RTS/CTS Operation in Wider Channels”, IEEE 802. 11 -10/1280 r 2, Nov 2010] • Field studies showing that non-overlapping channels interfere each other often in practice – ‘The myth of non-overlapping channels: interference measurements in IEEE 802. 11’, Fourth Annual Conference on Wireless on Demand Network Systems and Services, 2007. Submission Slide 5 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • 802. 11 network capacity degradation figures due to increasing number of stations in the same set of resources (EDCA) [Source: ‘Saturation Throughput of IEEE 802. 11 e EDCA Based on Mean Value Analysis, IEEE WCNC 2006] Submission Slide 6 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • 802. 11 network capacity degradation figures due to increasing number of stations in the same set of resources (STAs with Power Saving) [Source: ‘IEEE 802. 11 e Qo. S and Power Saving Features, Overview and Analysis of Combined Performance’, IEEE Wireless Communications 2010 ] Submission Slide 7 Xavier Perez Costa, NEC

doc. : IEEE 802. 11 -12/936 r 0 OBSS Background (802. 11 aa) • Estimates of maximum potential number of APs within range – Detached Houses 12 – Terraced Houses 16 – Townhouses 25 – Single Layout Apartments 28 – Double Layer Apartments 53 • OBSS traffic gets worse not only because of sharing, but also because of EDCA Overhead. For instance: – Is it better to share a 40 MHz channel or split to two independent 20 MHz channels? – Depends on the traffic as when doubled the EDCA overhead increases jeopardizing the gain of a 40 MHz channel Submission Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 802. 11 solutions addressing OBSS • IEEE 802. 11 aa – Channel Selection • Provides methods for Qo. S APs to select an occupied channel if no free channel is available – Different preferred partner selection list for EDCA Admission Control and HCCA – AP provides means to aid the channel selection based upon Qo. S loading of its network as well as ‘overlap’ – Sharing • Provides the capability for Qo. S APs to share such that an expectation of Qo. S can be “guaranteed” – EDCA Admission Control APs can co-operate – HCCA APs can co-operate with EDCA Admission Control APs – HCCA APs can co-operate Submission Slide 9 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 802. 11 solutions addressing OBSS • IEEE 802. 11 ac – Potential Channel overlapping example [Source: OBSS issue and simulation scenarios in TGac, IEEE 802. 11 -09/1157 r 1] – 802. 11 ac channel selection and management solutions [Source: Channel Bounding and MAC protection mechanisms for 802. 11 ac, IEEE Globecom 2011] Submission Slide 10 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 802. 11 solutions addressing OBSS • Others? Submission Slide 11 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • Straw poll question – Do you believe that the current set of OBSS management solutions will be enough for the increasing number of 802. 11 devices per squared meter in the future? • Yes • No • Abstain Submission Slide 12 Xavier Perez Costa, NEC

July 2012 doc. : IEEE 802. 11 -12/936 r 0 OBSS Status • Straw poll question – Should 802. 11 consider defining further OBSS management solutions in current or future task groups? • Yes • No • Abstain Submission Slide 13 Xavier Perez Costa, NEC