Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [STDS-802-11-TGBN] Roaming TTT: 11-25/1982 doc on Urgent roaming

Hi Binita ,


Thanks for your efforts on this.


Regarding on the following proposed new text, I wonder when the target AP MLD install the SMD _Roaming _Key? Does it happened after any UHR STA associated with any AP MLD in the SMD ? If so, I'm afraid the SMD _Roaming_Key number will be equal to the UHR STA numbers in the same SMD , and that will be a huge memory cost on each AP MLD in a larger network. Please help clarify that, maybe I make some mistake.



If thePer-AP MLD PTK mode is used, an SMD _Roaming_Key is derived using  the SMD _KDKat the time of initial association to the SMD -ME.The SMD _Roaming_Key is an SMD level key that is used to encrypt ST direct request and response frames exchanged over-the-air directly between the non-AP MLD and the target AP MLD when Per-AP MLD PTK mode is used.

The SMD _Roaming_Keyis derived as below:

-       SMD _Roaming_Key = KDF -Hash-Length(SMD _KDK,“SMD Roaming Key”, Min(AA,SPA) || Max(AA,SPA) || Min(ANonce,SNonce) || Max(ANonce,SNonce) || SMD Identifier)

where,

-       KDF -Hash-Length is the key derivation function as defined in 12.7.1.6.2 (Key derivation function (KDF )) using the hash algorithm identified by the corresponding AKM .

-       Length is the total number of bits to derive, i.e., number of bits of theSMD_Roaming_Keyand is equal to the length of the PTK .

-       The AA is the MLD MAC address of the AP MLD through which association to the SMD -ME occurs.






Thanks


Best Regards


Jay Yang (杨志杰)



Original
From: BinitaGupta <bingupta.ieee@xxxxxxxxx>
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx <STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx>;
Date: 2026年01月08日 22:31
Subject: [STDS-802-11-TGBN] Roaming TTT : 11-25/1982 doc on Urgent roaming
Hi Roaming TTT members,
I have uploaded doc 11-25/1982 that resolves 12 CIDs related to supporting urgent roaming directly with a target AP MLD within an SMD .

Could you please review and provide any feedback you have.

@Alfred Asterjadhi  - could you please add following to the TGbn MAC agenda.

  • 11-25/1982 (12 CIDs ) 


Thanks,
Binita

To unsubscribe from the STDS-802-11-TGBN list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1


To unsubscribe from the STDS-802-11-TGBN list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1