LG R&D Complex Anyang-Shi, Kyungki- Do, Korea Month Year doc.: IEEE 802.11-yy/xxxxr0 September 2012 Partial AID Date: 2012-09-17 Authors: Name Affiliations Address Phone Email 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 Eric Wong Broadcom Sunnyvale, CA +1 408 922 6672 ewong@broadcom.com Matthew Fischer mfischer@broadcom.com Minyoung Park Intel Hillsboro, OR +1 503 712 4705 minyoung.park@intel.com Adrian Stephens Tom Tetzlaff Emily Qi Simone Merlin Qualcomm San Diego, CA +1 858 845 1243 smerlin@qualcomm.com Santosh Abraham Menzo Wentink Alfred Asterjadhi Amin Jafarian Hemanth Sampath VK jones Yongho Seok, LG Electronics John Doe, Some Company

Authors: September 2012 Month Year doc.: IEEE 802.11-yy/xxxxr0 Name Affiliations Address Phone Email Yong Liu Marvell Hongyuan Zhang Sudhir Srinivasa George Calcev Huawei Rolling Meadows, IL, USA George.Calcev@huawei.com Osama Aboul Magd Young Hoon Betty Zhao David Yangxun Bin Zhen ChaoChun Wang MediaTek James Wang Jianhan Liu Vish Ponnampalam James Yee Huai-Rong Shao   Samsung Electronics Chiu Ngo Minho Cheong ETRI Jae Seung Lee Hyoungjin Kwon Heejung Yu Sok-kyu Lee Sun, Bo         ZTE Lv, Kaiying         John Doe, Some Company

Authors: September 2012 Name Affiliations Address Phone Email Sayantan Choudhury Nokia Taejoon Kim Klaus Doppler Chittabrata Ghosh Esa Tuomaala Ken Mori Panasonic Rojan Chitrakar Haiguang Wang I2R Shoukang Zheng Yeow Wai Leong Zander Lei Jaya Shankar Anh Tuan Hoang Joseph Teo Chee Ming Yongho Seok, LG Electronics

September 2012 Motivation In IEEE 802.11ac, what is the partial AID operation of the receiver? Access Point operation If the group ID field is equal to 0 and the partial AID field is equal to BSSID[39:47], AP decodes the following PSDU Otherwise, it does not decode the following PSDU STA operation If the group ID field is equal to 63 and the partial AID field is equal to either (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9 or 0, STA decodes the following PSDU Yongho Seok, LG Electronics

September 2012 Motivation In IEEE 802.11ah spec framework, SIG field of SU preamble does not have a group ID field Then, in IEEE 802.11ah, what is the partial AID operation of the receiver? Can the receiver use the following rule? Access Point operation If the group ID field is equal to 0 and the partial AID field is equal to BSSID[39:47], AP decodes the following PSDU Otherwise, it does not decode the following PSDU STA operation If the group ID field is equal to 63 and the partial AID field is equal to either (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9 or 0, STA decodes the following PSDU Yongho Seok, LG Electronics

Partial AID ambiguity issue September 2012 Partial AID ambiguity issue When BSSID[39:47] is equal to 0, STA decodes the following PSDU even though the corresponding PPDU is addressed to AP Issue Points Yongho Seok, LG Electronics

Partial AID ambiguity issue September 2012 Partial AID ambiguity issue When AP assign an AID to a STA that results in the PARTIAL_AID value, as computed using (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9, being equal to BSSID [39:47], the STA decodes following PSDU even though the corresponding PPDU is addressed to AP Issue Points Yongho Seok, LG Electronics

Proposal For resolving partial AID ambiguity issue September 2012 Proposal For resolving partial AID ambiguity issue Option 1: Add partial AID type field (1bit) in SIG [1] Drawback is wasting a scarce SIG resource Option 2: Modify partial AID rule as the following For solving the issue on slide 6, A STA that transmits a PPDU to an AP shall set the TXVECTOR parameter PARTIAL_AID to (dec(BSSID[39:47]) mod (2^9-1))+1 For solving the issue on slide 7, AP should not assign an AID to a STA that results in the PARTIAL_AID value, as computed using (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9, being equal to (dec(BSSID[39:47]) mod (2^9-1))+1 Preference is an Option 2 Yongho Seok, LG Electronics

Discussion Do we need to consider the following OBSS issue? September 2012 Discussion Do we need to consider the following OBSS issue? When AP assign an AID to a STA that results in the PARTIAL_AID value, as computed using (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9, being equal to (dec(Overlapping BSSID[39:47]) mod (2^9-1))+1, the STA decodes following PSDU even though the corresponding PPDU is addressed to Overlapping AP If needed, the proposed solution is as the following AP should not assign an AID to a STA that results in the PARTIAL_AID value, as computed using (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9, being equal to (dec(Overlapping BSSID[39:47]) mod (2^9-1))+1 And, a STA can request to change its AID when it is overhearing an uplink frames transmitted from other BSS Yongho Seok, LG Electronics

September 2012 Conclusion In order to resolve the partial AID ambiguity issue, two options are proposed Preference is to modify partial AID rule instead of adding partial AID type field in SIG Some AIDs may not be assigned for a STA In 802.11ac Draft 3.0, an AP should not assign an AID to a STA that results in the PARTIAL_AID value, as computed using (dec(AID[0:8]+dec(BSSID[44:47]XORBSSID[40:43])x2^5)mod 2^9, being equal to 0 Those AID can be used for the multicast frame transmission in a short MAC header Yongho Seok, LG Electronics

September 2012 Reference https://mentor.ieee.org/802.11/dcn/12/11-12-0832-02-00ah-sig-fields-design-of-long-preamble.ppt Yongho Seok, LG Electronics

Straw Poll Do you support to modify partial AID rule as the following? September 2012 Straw Poll Do you support to modify partial AID rule as the following? A STA that transmits a PPDU to an AP shall set the TXVECTOR parameter PARTIAL_AID to (dec(BSSID[39:47]) mod (2^9-1))+1 AP should not assign an AID to a STA that results in the PARTIAL_AID value, as computed using Equation (9-8a), being equal to either (dec(BSSID[39:47]) mod (2^9-1))+1 or (dec(Overlapping BSSID[39:47]) mod (2^9-1))+1 Yongho Seok, LG Electronics