11ah Channelization Discussion September 2006 doc.: IEEE 802.11-06/1458r0 September 2011 11ah Channelization Discussion Date: 2011-09-12 Authors: James Wang et al Joonsuk Kim, Broadcom Corp.

FCC Part 15 (US) Frequency Hopping Scheme should be avoided. 2019/12/18 FCC Part 15 (US) Frequency Hopping Scheme should be avoided. Adrian Stephen Jan 04, 11 email opposed the use of Frequency Hopping. § 15.247 a.(2) Systems using digital modulation techniques may operate in the 902–928 MHz, 2400–2483.5 MHz, and 5725–5850 MHz bands. The minimum 6 dB bandwidth shall be at least 500 kHz. To avoid using FH, channel bandwidth in US needs to be > 500 kHz James Wang et al

Example Timing Related Parameters: Downclocking of 11ac by 10 September 2011 Example Timing Related Parameters: Downclocking of 11ac by 10 Corresponding 11ac BW MHz 20 40 80 160 FFT Size 64 128 256 512 Tfft: Inverse FFT Period μS (1/Δf) 3.2 TGI: Guard Time μS .4 BW 1 2 4 8 16 32   Sampling Frequency Cyclic Prifix, Sample Sample TGI: Guard Time Duration μs Number of Data Subcarriers 26 52 108 234 468 Number of Pilot Subcarrier 6 Δf: Subcarrier Spacing kHz 31.25 Tsymbol: Symbol Duration Note: Sub 1MHz BW TBD, James Wang et al (MediaTek)

Regulatory Restrictions on Channel/BW September 2011 Regulatory Restrictions on Channel/BW US Japan China Singapore Korea Europe Channel 100kHz /200kHz 200kHz/400kHz /1MHz? 200kHz Min BW 500kHz Max BW None 1MHz 1MHz (470-566 , 614-787MHz) .6/3/7 MHz Ref Doc # 11-11-0947 11-11-0957, 11-11-0972 11-11-1133 11-11-0685 Note from 00-00-0972 ZTE presentation: 200KHz limitation in Band 470MHz-510MHz leads to limited date rate, may satisfy use case 1 categories, but hard to support use case 3 with up to 10Mbps 400KHz limitation in Band 314MHz~316MHz and 430MHz~434MHz doubles previous 200KHz, and provided limited date rate too No limitation in 779MHz~787MHz James Wang et al (MediaTek)

Channelization/Bandwidth Proposal 2019/12/18 Channelization/Bandwidth Proposal Channelization/Bandwidth affects the choice of the reference clock for PLL (needs to step through channel) Too high a reference clock results in difficulty in the band edge alignment (waste of bandwidth) Too small a reference clock affects phase noise and synthesizer choice (fractional vs integer) Proposed BW: 1/2/4/8/16 MHz (Narrower BW TBD) Note: Another possibility is .625M/1.25M/2.5M/5M/10M/20M Too wide for Japan, China James Wang et al

September 2011 Straw poll Do you support the bandwidths of 1, 2, 4, 8, 16 MHz with narrower bandwidth TBD for 11ah? Yes No Abstain James Wang et al (MediaTek)

Example Timing Related Parameters: Shorter Guard Time September 2011 Example Timing Related Parameters: Shorter Guard Time Corresponding 11ac BW MHz 20 40 80 160 FFT Size 64 128 256 512 Tfft: Inverse FFT Period μS (1/Δf) 3.2 TGI: Guard Time μS .8 BW 1 2 4 8 16 32   Sampling Frequency Cyclic Prifix, Sample Sample TGI: Guard Time Duration μs Number of Data Subcarriers 26 52 108 234 468 Number of Pilot Subcarrier 6 Δf: Subcarrier Spacing kHz 31.25 Tsymbol: Symbol Duration 36 Note: Sub 1MHz BW TBD James Wang et al (MediaTek)