doc.: IEEE /936r0 Submission July 2012 Xavier Perez Costa, NECSlide 1 Review of Overlapping Networks (OBSS) Status and IEEE Solutions Date: Authors:
doc.: IEEE /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 Source: Cisco Visual Networking Index (VNI), [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]
doc.: IEEE /936r0 Submission OBSS Status WiFi Market penetration figures –In many countries more than 50% of households use July 2012 Xavier Perez Costa, NEC Slide 3 [Source:
doc.: IEEE /936r0 Submission OBSS Status WiFi Market penetration figures –Number of WiFi networks increasing every day … July 2012 Xavier Perez Costa, NEC Slide 4 [Source: ] Daily Number of WiFi Networks Total Number of WiFi Networks
doc.: IEEE /936r0 Submission OBSS Status 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 ’, Fourth Annual Conference on Wireless on Demand Network Systems and Services, 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 /0992r18, Sep. 2010] [Source: S. Merlin et al., “ CCA for RTS/CTS Operation in Wider Channels ”, IEEE /1280r2, Nov 2010]
doc.: IEEE /936r0 Submission OBSS Status 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 e EDCA Based on Mean Value Analysis, IEEE WCNC 2006]
doc.: IEEE /936r0 Submission OBSS Status 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 e QoS and Power Saving Features, Overview and Analysis of Combined Performance’, IEEE Wireless Communications 2010 ]
doc.: IEEE /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
doc.: IEEE /936r0 Submission solutions addressing OBSS IEEE aa –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
doc.: IEEE /936r0 Submission solutions addressing OBSS IEEE ac –Potential Channel overlapping example –802.11ac channel selection and management solutions July 2012 Slide 10 [Source: OBSS issue and simulation scenarios in TGac, IEEE /1157r1] [Source: Channel Bounding and MAC protection mechanisms for ac, IEEE Globecom 2011] Xavier Perez Costa, NEC
doc.: IEEE /936r0 Submission solutions addressing OBSS Others? July 2012 Slide 11 Xavier Perez Costa, NEC
doc.: IEEE /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 devices per squared meter in the future? Yes No Abstain July 2012 Slide 12 Xavier Perez Costa, NEC
doc.: IEEE /936r0 Submission OBSS Status Straw poll question –Should consider defining further OBSS management solutions in current or future task groups? Yes No Abstain July 2012 Slide 13 Xavier Perez Costa, NEC