Duplicate Bandwidth and Operation Month Year doc.: IEEE 802.11-yy/XXXXr0 March 2013 Duplicate Bandwidth and Operation Date: 2013-03-18 Authors: Name Affiliation Address Phone Email Liwen Chu STMicroelectronics Liwen.chu@st.com Hongyuan Zhang Marvell Hongyuan@marvell.com George Vlantis George.vlantis@st.com Yuan Zhou I2R yzhou@i2r.a-star.edu.sg Zander Lei Shoukang Zheng Haiguang Wang Yeow Wai Leong ChaoChun Wang MediaTek chaochun.wang@mediatek.com James Yee james.yee@mediatek.com Simone Merlin Qualcomm smerlin@qualcomm.com Minyoung Park Intel Corp. minyoung.park@intel.com Jianhan Liu jianhan.liu@mediatek.com Vish Ponnampalam vish.ponnampalam@mediatek.com James Wang james.wang@mediatek.com Liwen Chu, ST Shoukang ZHENG et. al, I2R, Singapore

Name Affiliation Address Phone Email March 2013 Name Affiliation Address Phone Email Huairong Shao Samsung Chiu Ngo chiu.ngo@samsung.com Su Khiong Yong Marvell skyong@marvell.com Sudhir Srinivasa sudhirs@marvell.com Sayantan Choudhury Nokia 2075 Allston Way, Suite 200, Berkeley, CA 94704 +1 510 599 9268 sayantan.choudhury@nokia.com Klaus Doppler Chittabrata Ghosh Esa Tuomaala Sun, Bo         ZTE sun.bo1@zte.com.cn Lv, Kaiying         lv.kaiying@zte.com.cn Tom Tetzlaff Intel Corp. thomas.a.tetzlaff@intel.com Emily Qi emily.h.qi@intel.com Yongho Seok LG Electronics LG R&D Complex Anyang-Shi, Kyungki-Do, Korea +82-31-450-1947 yongho.seok@lge.com Jinsoo Choi Jeongki Kim Jin Sam Kwak Liwen Chu, ST

Name Affiliation Address Phone Email March 2013 Name Affiliation Address Phone Email Matthew Fischer Broadcom 190 Mathilda Place, Sunnyvale, CA +1 408 543 3370 mfischer@broadcom.com Eric Wong ewong@broadcom.com Yong Liu yongliu@broadcom.com Rojan Chitrakar Panasonic Rojan.Chitrakar@sg.panasonic.com Ken Mori Mori.ken1@jp.panasonic.com Alfred Asterjadhi Qualcomm Amin Jafarian Santosh Abraham Menzo Wentink Hemanth Sampath VK Jones Minho Cheong ETRI 138 Gajeongno, Yuseong-gu, Dajeon, Korea +82 42 860 5635 minho@etri.re.kr Jae Seung Lee jasonlee@etri.re.kr Hyoungjin Kwon kwonjin@etri.re.kr Jaewoo Park parkjw@etri.re.kr Sok-kyu Lee Sk-lee@etri.re.kr Liwen Chu, ST

Name Affiliation Address Phone Email March 2013 Name Affiliation Address Phone Email George Calcev Huawei Rolling Meadows, IL USA George.Calcev@huawei.com Osama Aboul Magd Osama.AboulMagd@huawei.com Young Hoon Kwon Younghoon.Kwon@huawei.com Betty Zhao Betty.Zhao@huawei.com David Yangxun David.Yangxun@huawei.com Bin Zhen ZhenBin@huawei.com Anna Pantelidou Renesas Mobile Juho Pirskanen Timo Koskela Liwen Chu, ST

Duplicate Bandwidth Indication Requirement in 11ac/ah Bandwidth and dynamic indication are carried in PHY scrambler seed field. 3 bits are used: 2 bits for bandwidth indication (20MHz. 40MHz, 80MHz, 160/80+80MHz), 1bit for dynamic indication. Signalling TA is used to indicates that scrambler seed includes bandwidth. In 802.11ah, 1MHz duplicate and 2MHz duplicate are required. 4 bits is required for bandwidth and dynamic indication in a 1MHz duplicate mode. 3 bits for bandwidth indication (1MHz, 2MHz, 4MHz, 8MHz, 16MHz), 1bit for dynamic indication. There are issues in 11ah to carry bandwidth and dynamic indication in scrambler seed field. There is no legacy STAs in 11ah band. Changing control frames to carry Bandwidth and dynamic indication is ok. 7 reserved bits in Frame Control field can be used to carry such information. B0 B1 B2 B3 B4 B7 B8 B9 B10 B11 B12 B13 B14 B15 Protocol Version Type (Control) Subtype To DS (0) From DS (0) More Frag (0) Retry (0) Power Management More Data (0) Protected Frame (0) Order (0) Liwen Chu, ST 5

PHY Concerns Assume that we carry over the 11ac scrambler seed mechanism for delivering the BW and Dyn BW indications. In the case of 1MHz dup mode, 3 bits required for BW indication, and 1 bit required for DynBW indication, this leaves only 3 random bits for scrambling seed. Only 7~8 combinations. May affect the averaged data field PAPR. An alternative design is to use the reserved bit in the SERVICE field, but typically we don’t want to use up all the bits in SERVICE field. It is then easier to move this indication to MAC header reserved bits. Parsing the additional MAC subfield is much easier and of lower risks. Liwen Chu, ST

Proposed Duplicate Bandwidth Indication in 11ah In a 1MHz duplicate control frame, Bandwidth Indication 0, 1, 2, 3, 4 indicate 1MHz, 2MHz, 4MHz, 8MHz, 16 MHz respectively. Other values of Bandwidth Indication are reserved. In a 2MHz duplicate control frame, Bandwidth Indication 1, 2, 3, 4 indicate 2MHz, 4MHz, 8MHz, 16 MHz respectively. Other values of Bandwidth Indication are reserved. Dynamic Indication in RTS indicates whether duplicate RTS/CTS are used for dynamic bandwidth negotiation. Dynamic Indication is reserved (set to 0) in other control frames. B0 B1 B2 B3 B4 B7 B8 B10 B11 B12 B13 B14 B15 Protocol Version Type (Control) Subtype Bandwidth Indication Dynamic Indication Power Management More Data (0) Protected Frame (0) Order (0) Liwen Chu, ST 7

Pre Motion 1 Do you agree to include in 802.11ah SFD bandwidth and dynamic bandwidth indication to be defined in the frame control fields of control frames with details TBD, whether this is to be applied to non-duplicate control frames except 1 or 2 MHz is TBD? Yes No Abstain Liwen Chu, ST 8

Reference [1] 11-11/1137r13 Proposed Specification Framework for TGah. Liwen Chu, ST 9