1. doc.: IEEE 802.11-11/1238r0 Submission September 2011 Rolf de Vegt, QualcommSlide 1 Channelization and Bandwidth Modes for 802.11ah Date: 2011-9-18 Authors:

2. doc.: IEEE 802.11-11/1238r0 Submission Abstract In this document we propose the transmission bandwidths and channelization for 802.11ah –Transmission bandwidths (BW) refer to the channel widths (or BW modes) for which the 802.11ah PHY should provide support Impacts the actual clause on 802.11ah PHY specification –Channelization refers to the process of breaking down the available spectrum in different regions into ‘channels’ Mainly impacts sections analogous to Annex J of Std-802.11-2007 Slide 2Rolf de Vegt, Qualcomm

3. doc.: IEEE 802.11-11/1238r0 Submission Sub 1GHz Spectrum Availability in Key Geographies Slide 3 902928 MHz 917923.5 929.7 779787863868.6 8 MHz 5.6 MHz 26 MHz 6.5 MHz China (max erp <= 10 mW) EU US (max erp <=1 W) Korea Japan (Max BW = 1MHz) RegionTx power regulations USMax e.r.p. <= 1 W EUmax erp <=14 dBm PSD <= -4.5 dBm/100KHz (863~868.6MHz) PSD <= 6.2 dBm/100KHz (865~868MHz) Korea3 mW or 10 mW (920.6~923.5MHz and six 200 KHz channels below 920.6 MHz) ChinaMax e.r.p. <= 10 mW Japan1mW, 20 mW or 250 mW (915.9~929.7MHz) Max BW <= 1 MHz 915.9 928 MHz 13.8 MHz Rolf de Vegt, Qualcomm

4. doc.: IEEE 802.11-11/1238r0 Submission Practical Applicability of Use Cases by Geography based on Spectrum Availability Considerations GeoSensorBackhaul For Sensor Extended Range Wi-Fi Rationale USYes EUYes?No Stringent Duty Cycle Limitations Only one 4MHz channel available JapanYes No No channel BW >1 MHz available KoreaYes No Only 6.5MHz total BW available China??? TBD Incremental market opportunity for 802.11 LargerSmaller Extended Range Wi-Fi use case will most likely lead to feature adds to existing wi-fi devices Slide 4Rolf de Vegt, Qualcomm

5. doc.: IEEE 802.11-11/1238r0 Submission Proposal for Transmission Bandwidths in 11ah Definitely need a 1MHz mode –Japan has a max BW limit –Need enough channels in regions like EU/Korea Limited spectrum 2 MHz mode needed for the following reasons –Accommodate waveforms that are multiples of 2 MHz channels, to meet the extended range Wi-Fi use-case requirement Need higher BWs for satisfying that use-case –Ensure that 1 MHz waveforms can inter-operate globally with higher BWs We propose that the following BWs be supported in the standard –1 MHz (Mandatory) –2 MHz (Mandatory) –4, 8 and 16 MHz (Optional) Slide 5Rolf de Vegt, Qualcomm

6. doc.: IEEE 802.11-11/1238r0 Submission PHY Numerology for the Transmission BWs Propose to have the same tone spacing for all BW modes –Different BWs should be achieved through different FFT sizes –Helps in achieving co-existence if we have same symbol duration Propose to have 64 tones for the 2 MHz mode –Gives a long enough CP for outdoor deployments –Minimizes new design work as 11ac already has designs for up-to 512 pt FFT Modes >= 2 MHz become 10x down-clocking (expansion) in terms of symbol times and other related parameters in 11ac –1 MHz mode is the only mode which will need a new design Slide 6Rolf de Vegt, Qualcomm

7. doc.: IEEE 802.11-11/1238r0 Submission Considerations regarding Mandatory 1MHz and 2MHz BW Modes For the US market alone, a minimum BW of 2 MHz would be highly feasible –May be preferable in some aspects However, we assume vendors’ desire to create global products as much as possible –Experience of Wi-Fi technology thus far Global market requires a 1 MHz bandwidth mode Full interoperability and coexistence between 1MHz and 2MHz modes –Stakeholders in 802.11ah likely to demand this –Makes the standard less vulnerable to potential regulatory changes –Simplifies co-existence and transmission of management frames –Assuming that the standard will contain a 1 MHz mode, there is no way to control where devices in 1 MHz are deployed Regulatory bodies don’t police this WFA does not test for this either Slide 7Rolf de Vegt, Qualcomm

8. doc.: IEEE 802.11-11/1238r0 Submission Proposal for Channelization Channelization for different regions –2, 4, 8, 16 MHz in the US With 26 MHz of spectrum, provides 13 channels No wastage of spectrum at the edges –1, 2, 4 MHz in EU/ Korea Limited spectrum makes 1 MHz channels necessary –1 MHz in Japan Max BW limit in Japan makes 1 MHz necessary Channelization much smaller than 1 MHz would encourage modes which are difficult to design as interoperable modes with higher BW modes –China, TBD Two possible options (contingent on regulatory developments) –Ability to use 779~787MHz (TV Bands) –Expansion of channel width to1 or 2 MHz in the future in some of the other bands Slide 8Rolf de Vegt, Qualcomm

9. doc.: IEEE 802.11-11/1238r0 Submission Resulting Global Channel Availability GeoFreq (MHz) BW Max BW allowed Tx Power Regulations Other limitations # of 1MHz Ch # of 2MHz Ch # of 4MHz Ch US 902 - 92826 MHz Max e.r.p. <= 1 W n/a136 EU 863 -868.65.6 MHz max erp <=14 dBm PSD <= -4.5 dBm/100KHz (863~868.6MHz) PSD <= 6.2 dBm/100KHz (865~868MHz High power RFID (2W!) share the band 865- 868MHz (hence allowing much higher PSD) Duty cycle limitation of 2.8% for a given 200KHz (max 100sec transmission in 1 hour) 521 Japan 915.9-929.713.8 MHz 1 MHz 1mW, 20 mW or 250 mW (915.9~929.7MHz) Max BW <= 1 MHz 130 (6)0 (3) Korea 917 – 923.56.5 MHz 3 mW or 10 mW (920.6~923.5MHz and six 200 KHz channels below 920.6 MHz) 631 China 779 – 7878 MHz ? Max e.r.p. <= 10 mW ??? Slide 9Rolf de Vegt, Qualcomm