AID Selection Date: 2010-09-12 Authors: September 2010 Month Year doc.: IEEE 802.11-yy/xxxxr0 September 2010 AID Selection Date: 2010-09-12 Authors: Youhan Kim, et al. John Doe, Some Company

September 2010 Background AID is a value assigned by AP during association that represents the ID of the STA Possible AID values: 1–2007 AID of value 0 is reserved for broadcast/multicast packets VHT-SIG A has a partial AID field for SU packets to enable STA power saving [1] Youhan Kim, et al.

Special AID for AP No AID defined for APs September 2010 Special AID for AP No AID defined for APs AID 0 reserved for broadcast/multicast packets STA unable to utilize AID based power save mode when detecting STA-to-AP packets if AID 0 is reused for STA-to-AP packets Suggest to use special (non-zero) AID value(s) for STA-to-AP packets Youhan Kim, et al.

September 2010 AID Generation (1) 802.11 spec does not define how AP should generate/assign AIDs Most existing AP implementations assign AIDs starting from 1 and increasing sequentially Highly likely two STAs in OBSSs will share the same AID Unable to utilize AID based power save mode when detecting packets destined to the STA in OBSS AP should generate/assign AID in a random manner E.g. AP picks a random base for AID assignment upon power up. AP then assign AIDs in sequence starting from the base. If N is picked as base, AID assigned in sequence of N, N+1, N+2, … Enterprise vendors may want to manually configure every AP’s starting AID number Network topology known Youhan Kim, et al.

September 2010 AID Generation (2) AP should avoid assigning an AID value with its 9 LSB bits as 0 AID 512, 1024, and 1536 should be avoided AP should avoid assigning AID values with its 9 LSB bits matching the special partial AID value used in STA-to-AP packets E.g. If all 9 bits of 1 is used as the special AID value for STA-to-AP packets AID 511, 1023, and 1535 should be avoided Youhan Kim, et al.

September 2010 Straw Poll #1 Do you support adding the following into the specification framework document, 11-09/0992? Partial AID field in VHT-SIG A shall be set to special value(s) (TBD) for STA-to-AP packets. Youhan Kim, et al.

September 2010 Straw Poll #2 Do you support adding the following into the specification framework document, 11-09/0992? AP should choose AID numbers such that the probability of AID numbers overlapping between OBSS is reduced. Youhan Kim, et al.

September 2010 Straw Poll #3 Do you support adding the following into the specification framework document, 11-09/0992? Any AID values with 9 LSB bits of 0 should not be assigned as a non-AP STA AID. Youhan Kim, et al.

September 2010 References [1] Stacey, R. et al., Specification Framework for TGac, IEEE 802.11-09/0992r13, July 2010 Youhan Kim, et al.