1. doc.: IEEE 802.11-12/936r0 Submission July 2012 Xavier Perez Costa, NECSlide 1 Review of Overlapping 802.11 Networks (OBSS) Status and IEEE 802.11 Solutions Date: 2012-07-18 Authors:

2. doc.: IEEE 802.11-12/936r0 Submission OBSS Status WiFi Market penetration figures –WiFi 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. July 2012 Xavier Perez Costa, NEC Slide 2 [Source: Wired, Wi-Fi and mobile traffic volume in 2010 and 2015. Source: Cisco Visual Networking Index (VNI), www.cisco.com] [Source: WiFi certified passpoint - white paper – Feb 2012] [Source: ComScore, “Digital Omnivores: How Tablets, Smartphones and Connected Devices are Changing U.S. Digital Media Consumption Habits”, 2011]

3. doc.: IEEE 802.11-12/936r0 Submission OBSS Status WiFi Market penetration figures –In many countries more than 50% of households use 802.11 July 2012 Xavier Perez Costa, NEC Slide 3 [Source: http://recombu.com/digital/news/almost-three-quarters-of-british-homes-have-a-wifi-network_M10255.html]

4. doc.: IEEE 802.11-12/936r0 Submission OBSS Status WiFi Market penetration figures –Number of WiFi networks increasing every day … July 2012 Xavier Perez Costa, NEC Slide 4 [Source: http://wigle.net/gps/gps/main ] Daily Number of WiFi Networks Total Number of WiFi Networks

5. doc.: IEEE 802.11-12/936r0 Submission OBSS Status 802.11 Available Channels 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. July 2012 Xavier Perez Costa, NEC Slide 5 Channelization for US Channelization for Europe, Japan [Source: Robert Stacey et al., “Specification Framework for TGac”, IEEE 802.11-09/0992r18, Sep. 2010] [Source: S. Merlin et al., “ CCA for RTS/CTS Operation in Wider Channels ”, IEEE 802.11-10/1280r2, Nov 2010]

6. doc.: IEEE 802.11-12/936r0 Submission OBSS Status 802.11 network capacity degradation figures due to increasing number of stations in the same set of resources (EDCA) July 2012 Xavier Perez Costa, NEC Slide 6 [Source: ‘Saturation Throughput of IEEE 802.11e EDCA Based on Mean Value Analysis, IEEE WCNC 2006]

7. doc.: IEEE 802.11-12/936r0 Submission OBSS Status 802.11 network capacity degradation figures due to increasing number of stations in the same set of resources (STAs with Power Saving) July 2012 Xavier Perez Costa, NEC Slide 7 [Source: ‘IEEE 802.11e QoS and Power Saving Features, Overview and Analysis of Combined Performance’, IEEE Wireless Communications 2010 ]

8. doc.: IEEE 802.11-12/936r0 Submission OBSS Background (802.11aa) 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 40MHz channel or split to two independent 20MHz channels? –Depends on the traffic as when doubled the EDCA overhead increases jeopardizing the gain of a 40MHz channel Xavier Perez Costa, NEC

9. doc.: IEEE 802.11-12/936r0 Submission 802.11 solutions addressing OBSS IEEE 802.11aa –Channel Selection Provides methods for QoS 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 QoS loading of its network as well as ‘overlap’ –Sharing Provides the capability for QoS APs to share such that an expectation of QoS 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 July 2012 Slide 9 Xavier Perez Costa, NEC

10. doc.: IEEE 802.11-12/936r0 Submission 802.11 solutions addressing OBSS IEEE 802.11ac –Potential Channel overlapping example –802.11ac channel selection and management solutions July 2012 Slide 10 [Source: OBSS issue and simulation scenarios in TGac, IEEE 802.11-09/1157r1] [Source: Channel Bounding and MAC protection mechanisms for 802.11ac, IEEE Globecom 2011] Xavier Perez Costa, NEC

11. doc.: IEEE 802.11-12/936r0 Submission 802.11 solutions addressing OBSS Others? July 2012 Slide 11 Xavier Perez Costa, NEC

12. doc.: IEEE 802.11-12/936r0 Submission 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 July 2012 Slide 12 Xavier Perez Costa, NEC

13. doc.: IEEE 802.11-12/936r0 Submission OBSS Status Straw poll question –Should 802.11 consider defining further OBSS management solutions in current or future task groups? Yes No Abstain July 2012 Slide 13 Xavier Perez Costa, NEC