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Non contiguous 40+40 additional bandwidth mode

Explore the benefits of implementing the optional 40+40MHz non-contiguous transmission mode to optimize band utilization in 11ac networks. This mode increases 80MHz transmission probability and minimizes interference from neighboring devices. Learn about its channel planning and integration complexity. Consider its application in regions with limited channels like Europe and China, where contiguous 80MHz mode may face challenges. Embrace this mode as a market-driven solution for enhanced network performance.

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Non contiguous 40+40 additional bandwidth mode

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  1. Non contiguous 40+40 additional bandwidth mode Date: 2010-09-16

  2. Content • The following modes have already been accepted by 11ac • 20MHz, 40MHz, 80MHz (mandatory) • 160MHz (optional) • Optional 40+40MHz non contiguous transmission mode should be added to the spec framework • 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 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, only 2 at 30dBm • With one channel (in red) which can strongly be affected by weather radars (see map next slide) • In many cases, contiguous only BSS will not be able to transmit at 80MHz without overlapping • Non contiguous 2x40MHz 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. 80MHz Channel planning in 5GHz band Map of weather radars occupying 5GHz spectrum in France On most of these regions, only 3 80MHz channels will be available

  5. Example of the use of 40+40MHz mode Weather radar 5170 MHz 5330 MHz 5490 MHz 5710 MHz • Non contiguous 2x40MHz mode enables full 80MHz transmission • Contiguous 80MHz mode is forced to share channel access 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 IEEE channel # 11ac neighbor 11n neighbor Interferer Interferers New BSS with contiguous 80 MHz New BSS with non contiguous 40 +40 MHz Limited access to channel Full access to channel Slide 5

  6. 40+40MHz mode • 40+40MHz mode leads to lower maximum throughput than contiguous 80MHz. • However, we have demonstrated in [1] and [2] that 40+40MHz mode is way more resistant to neighbors traffic than 80MHz mode. The environment doesn’t need to be very dense to see the gains provided by 40+40MHz mode. • For China where the number of channels are even more limited, the efficiency of this mode compared to contiguous 80MHz will be even more significant. • It’s very likely that some products in the market already implement this technology. • We should define this mode and let the market decide.

  7. Possible transmit flowfor 40+40MHz mode • Transmit flow for non-contiguous 40+40MHz transmissions: • Perform channel coding • Parse the encoder output bits into stream(s) • For each stream, the stream parser output bits are allocated to two 40 MHz segments in an alternating fashion • Even bits to the 40 MHz segment lower in frequency and odd bits to 40 MHz segment higher in frequency, where the first bit from the stream parser output in each symbol is an even bit • If BCC is used, interleave per 40 MHz segment, with each segment using interleaver defined for 40 MHz transmission

  8. Conclusion • 40+40MHz non contiguous transmission mode should be added to the spec framework as an optional feature • 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

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

  10. References • [1] Cariou, L. and Christin, P., 80MHz and 160MHz channel access modes, IEEE 802.11-10/0385r1, Mar. 2010 • [2] Cariou, L. and Benko, J., Gains provided by multichannel transmissions, IEEE 802.11-10/0103r1, Jan. 2010

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