1. BSS Max Idle Time Advertisement
Month Year
doc.: IEEE yy/xxxxr0
May 2007
BSS Max Idle Time Advertisement
Authors:
Date:
Name
Company
Address
Phone
Thomas Kuehnel
Microsoft Corp
One Microsoft Way, Redmond, WA 98075
Subbu Ponnuswamy
Aruba Networks
1322 Crossman Ave, Sunnyvale, CA 94089
Henry Ptasinski
Broadcom
190 Mathilda Place, Sunnyvale, CA 94086
Emily Qi
Intel Corporation
2111 NE 25th Hillsboro, OR 97124
Jiandong Ruan
Allan Thomson
Cisco Systems
170 W. Tasman Drive, San Jose, CA 95134
James Tsai
Qi Wang
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Thomson et al, Cisco Systems
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
May 2007
Abstract
This presentation introduces a method for an AP to advertise how long a non-AP STA may remain idle before the AP disassociates the STA
Thomson et al, Cisco Systems
John Doe, Some Company

3. The Problem STAs may go to sleep while associated to an AP
STAs have no way of knowing how long they are allowed to remain asleep before AP disassociates the STA
Effect: STA can not maximize sleep time while remaining associated
Thomson et al, Cisco Systems

4. Solution Today Proprietary schemes exist
May 2007
Solution Today
Proprietary schemes exist
Assumptions or proprietary agreements about AP disassociate time period
STA must periodically wake based on that time period to send a keep-alive frame
Upon receipt of the keep-alive frame the AP resets the idle timer associated with the STA
Thomson et al, Cisco Systems

5. Proposed Solution Mechanism for AP to advertise max idle time period
May 2007
Proposed Solution
Mechanism for AP to advertise max idle time period
STA must send keep-alive before idle time period expires to reset the AP’s idle timer for the STA
Thomson et al, Cisco Systems

6. New BSS Max Idle Time IE Sent in (re)association responses Two fields
May 2007
New BSS Max Idle Time IE
Sent in (re)association responses
Two fields
Max Idle Period
Idle Options
Max Idle Period defined in 1000 TUs
Value 5 = 5 * 1024uS * 1000 = uS = ~5secs
Value 300 = 307.2s = ~5mins
Thomson et al, Cisco Systems

7. Idle Options APs may require all keep-alives to be protected frames
Removes DoS attack
Avoids keep-alive spoofing
Administrators may choose to allow unprotected keep-alives even if RSNA deployed
Thomson et al, Cisco Systems

8. May 2007
Motion
Move to include normative text in document xxx v-bss-max-idletime.doc into the TGv draft.
Mover:
Seconder:
Result:
Thomson et al, Cisco Systems