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Non contiguous 40+40 MHz mode for Europe, Japan and global

This proposal suggests adding a non-contiguous 40+40 MHz transmission mode to the 11ac specification framework to improve frequency planning and increase the probability of transmitting at 80 MHz in the presence of neighboring BSS or radars. This mode would provide a high throughput experience for end-users in dense areas.

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Non contiguous 40+40 MHz mode for Europe, Japan and global

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  1. Non contiguous 40+40 MHz mode for Europe, Japan and global Date: 2010-11-06

  2. Content • The following modes have already been accepted by 11ac • 20MHz, 40MHz, 80MHz (mandatory) • Contiguous and non contiguous 160MHz (optional) • Optional 40+40MHz non contiguous transmission mode should be added to the spec framework especially for Europe, Japan and Global operating class tables • it enables to exploit the part of the band left aside by the current contiguous 80MHz frequency planning • it increases the probability to transmit at 80MHz (the target of 11ac) in presence of neighboring BSS or radars • its complexity is identical to the 80+80MHz mode already accepted by TGac

  3. 80MHz Channel planning in 5GHz band Weather radars 5170 MHz 5330 MHz 5490 MHz 5710 MHz 5735 MHz 5835 MHz • Only 4 channels for 80MHz in Europe/Japan/Global, only 2 at 30dBm • If a weather radar is active, one channel (in red) is denied, reducing the number of available channels to 3 • In many cases, contiguous only BSS will not be able to transmit at 80MHz without overlapping • Non contiguous 40+40MHz mode is the solution in this part of the band • each 40MHz segment is allocated in the band according to 40MHz channel planning 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165 IEEE channel # 20 MHz 40 MHz 80 MHz only in US Slide 3

  4. Neighboring BSS issue Neighboring BSS is an issue in big cities of Europe/Japan/Global because the density of population is high (>3000 people per sqKm) Europe: Japan USA Source : www.citymayors.com Slide 4

  5. Typical example of fragmented usage of 5GHz band in Europe/Japan Weather radars 5170 MHz 5330 MHz 5490 MHz 5710 MHz • In red colour, the 20MHz channels (48, 60, 100, 116 and 136) with a high load (neighboring 802.11g and 802.11n APs) • If a new 802.11ac AP is looking for 80MHz bandwidth … • Contiguous 80MHz transmission is disrupted due to high loaded channels (load > 80%) • Contention with neighboring APs and channel access is deferred • Non contiguous 40+40MHz transmission is assured thanks to low loaded channels (load < 10%) • Four 40MHz non contiguous channels are available !!! 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 IEEE channel # 20 MHz Load < 20% 40 MHz Load > 80% 80 MHz

  6. Extension of the existing non-contiguous mode • Non contiguous 40+40MHz mode could be paired with in the non contiguous 80+80 MHz mode • Chipsets with the non contiguous option could target 2 markets: • Low density areas when using 80+80 MHz • High density areas when using 40+40 MHz • Non contiguous 40+40MHz mode provides a high throughput experience for end-user in dense areas instead of a fallback of 40MHz mode ("802.11n like" behavior) • People living in cities of Europe, Japan, China, …

  7. Conclusion • 40+40MHz non contiguous transmission mode should be added to the spec framework as an optional feature for Europe/Japan/Global • Areas with less channels and high density of population • it enables to exploit the part of the band left aside by the current contiguous 80MHz frequency planning • it increases the probability to transmit at 80MHz (the target of 11ac) in presence of neighbors or radars.. • its complexity of integration is identical to the 80+80MHz mode already accepted by TGac

  8. Pre-motion • Do you support adding the following section and item into the specification framework document, 11-09/0992? • Section 3.1.D Non contiguous 160 MHz PHY Transmission • R3.1.D.1: The draft specification shall include support for non contiguous 40+40MHz PHY transmission, whose frequency spectrum consists of two segments, non-adjacent in frequency, each transmitted using one 40 MHz channel, for devices supporting non contiguous 160 MHz. • Yes: • No: • Abstain:

  9. References • [1] Cariou, L. and Christin, P., Non contiguous 40+40 additional bandwidth mode, IEEE 802.11-10/1159r1, Sept 2010 • [2] Cariou, L. and Christin, P., 80MHz and 160MHz channel access modes, IEEE 802.11-10/0385r1, Mar. 2010 • [3] Cariou, L. and Benko, J., Gains provided by multichannel transmissions, IEEE 802.11-10/0103r1, Jan. 2010

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