1. LG R&D Complex Anyang-Shi, Kyungki- Do, Korea
Month Year
doc.: IEEE yy/xxxxr0
September 2012
Partial AID
Date:
Authors:
Name
Affiliations
Address
Phone
Yongho Seok
LG Electronics
LG R&D Complex Anyang-Shi, Kyungki- Do, Korea
Jinsoo Choi
Jeongki Kim
Jin Sam Kwak
Eric Wong
Broadcom
Sunnyvale, CA
Matthew Fischer
Minyoung Park
Intel
Hillsboro, OR
Adrian Stephens
Tom Tetzlaff
Emily Qi
Simone Merlin
Qualcomm
San Diego, CA
Santosh Abraham
Menzo Wentink
Alfred Asterjadhi
Amin Jafarian
Hemanth Sampath
VK jones
Yongho Seok, LG Electronics
John Doe, Some Company

2. Authors: September 2012 Month Year doc.: IEEE 802.11-yy/xxxxr0 Name
Affiliations
Address
Phone
Yong Liu
Marvell
Hongyuan Zhang
Sudhir Srinivasa
George Calcev
Huawei
Rolling Meadows, IL, USA
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

3. 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

4. September 2012
Motivation
In IEEE ac, 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

5. September 2012
Motivation
In IEEE ah spec framework, SIG field of SU preamble does not have a group ID field
Then, in IEEE ah, 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

6. 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

7. 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

8. 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

9. 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

10. 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 ac 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

11. September 2012
Reference
Yongho Seok, LG Electronics

12. 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