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

Date: 2012-07-18

Authors:

Xavier Perez Costa, NEC


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


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


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


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


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


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


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


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


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


802.11 solutions addressing OBSS

  • Others?

Xavier Perez Costa, NEC


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


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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