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Review of Overlapping 802.11 Networks (OBSS) Status and IEEE 802.11 Solutions

Review of Overlapping 802.11 Networks (OBSS) Status and IEEE 802.11 Solutions. Date: 2012-07-18. Authors:. OBSS Status. [Source: Wired, Wi-Fi and mobile traffic volume in 2010 and 2015. Source: Cisco Visual Networking Index (VNI), www.cisco.com]

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Review of Overlapping 802.11 Networks (OBSS) Status and IEEE 802.11 Solutions

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  1. Review of Overlapping 802.11 Networks (OBSS) Status and IEEE 802.11 Solutions Date: 2012-07-18 Authors: Xavier Perez Costa, NEC

  2. OBSS Status • [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] • 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. Xavier Perez Costa, NEC

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

  4. OBSS Status Daily Number of WiFi Networks Total Number of WiFi Networks [Source: http://wigle.net/gps/gps/main ] • WiFi Market penetration figures • Number of WiFi networks increasing every day … Xavier Perez Costa, NEC

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

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

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

  8. 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. 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 Xavier Perez Costa, NEC

  10. 802.11 solutions addressing OBSS [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] • IEEE 802.11ac • Potential Channel overlapping example • 802.11ac channel selection and management solutions Xavier Perez Costa, NEC

  11. 802.11 solutions addressing OBSS • Others? Xavier Perez Costa, NEC

  12. 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 Xavier Perez Costa, NEC

  13. OBSS Status • Straw poll question • Should 802.11 consider defining further OBSS management solutions in current or future task groups? • Yes • No • Abstain Xavier Perez Costa, NEC

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