doc.: ieee 802.11-13/0089r0 submission listen interval update jan 2013 slide 1 date: 2013-01-13...
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doc.: IEEE 802.11-13/0089r0
Submission
Listen interval update
Jan 2013
Slide 1
Date: 2013-01-13Authors:
Jinsoo Choi, LG Electronics
Name Affiliations Address Phone email Jinsoo Choi LG Electronics LG R&D Complex Anyang-
Shi, Kyungki-Do, Korea +82-31-450-1918 [email protected]
Yongho Seok LG Electronics
Jeongki Kim LG Electronics
HanGyu Cho LG Electronics
Minyoung Park Intel Corp. [email protected]
Tom Tetzlaff Intel Corp. [email protected]
Emily Qi Intel Corp. [email protected]
Su Khiong Yong Marvell [email protected]
Hongyuan Zhang Marvell [email protected]
Sudhir Srinivasa Marvell [email protected]
Matthew Fischer Broadcom 190 Mathilda Place, Sunnyvale, CA
+1 408 543 3370 [email protected]
Eric Wong Broadcom [email protected]
Yong Liu Broadcom [email protected]
Rojan Chitrakar Panasonic [email protected]
Ken Mori Panasonic [email protected]
doc.: IEEE 802.11-13/0089r0
Submission
Jan 2013
Jinsoo Choi, LG ElectronicsSlide 2
Name Affiliations Address Phone email Simone Merlin Qualcomm 5775 Morehouse Dr,
San Diego, CA 8588451243 [email protected]
Alfred Asterjadhi Qualcomm
Amin Jafarian Qualcomm
Santosh Abraham Qualcomm
Menzo Wentink Qualcomm
Hemanth Sampath Qualcomm
VK Jones Qualcomm
Sun, Bo ZTE [email protected]
Lv, Kaiying ZTE [email protected]
Huai-Rong Shao Samsung [email protected]
Chiu Ngo Samsung [email protected]
Minho Cheong ETRI 138 Gajeongno, Yuseong-gu, Dajeon, Korea
+82 42 860 5635
Jae Seung Lee ETRI [email protected]
Hyoungjin Kwon ETRI [email protected]
Jaewoo Park ETRI [email protected]
Sok-kyu Lee ETRI [email protected]
Sayantan Choudhury Nokia 2075 Allston Way, Suite 200, Berkeley, CA 94704
+1 510 599 9268 [email protected]
Klaus Doppler Nokia
Chittabrata Ghosh Nokia
Esa Tuomaala Nokia
doc.: IEEE 802.11-13/0089r0
Submission
Jan 2013
Jinsoo Choi, LG ElectronicsSlide 3
doc.: IEEE 802.11-13/0089r0
Submission
Introduction
• A STA can operate as different behavior or pattern based on its demand, for example operating as a TIM mode or as a Non-TIM mode [1]
– STA’s traffic pattern or remaining battery may be changed– Behavior can change from receiving beacon/control frames from AP to being sleep mode for
power saving
• Listen interval is related to STA’s wakeup interval for power saving, which is mandatorily transmitted in the association request frame and now is able to have very wide range [2]
– A STA should behave with power management operation based on the established listen interval
– AP can utilize that information for its operation by getting knowledge of STA’s behavior
• If the STA want to change its operation mode with different wakeup interval for power saving, the listen interval is need to be updated but we don’t have an efficient mechanism to do that (possibly using reassociation request frame but causing unnecessary overhead)
• In this contribution, we propose the listen interval update procedure
Jan 2013
Slide 4 Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
Case: change of operation mode
• When a STA changes its operation mode (e.g. TIM mode to Non-TIM mode), then the STA needs to update its listen interval for power saving and is able to get the buffered data by informing the updated value to AP
– Changing of TIM/Non-TIM mode could require far different listen interval so it’s likely to update that (e.g. some sensor devices in Non-TIM mode at a duty cycle of several days/months)
– AP can discard and buffer the traffic for the STA based on the updated listen interval
Jan 2013
Slide 5 Jinsoo Choi, LG Electronics
Beacon (TIM)
TIM mode (check beacon, receive control frames, etc)
Changed to Non-TIM mode (Stay in power save mode)
Power saving with updated listen interval
Listen interval
PS-Poll/trigger
doc.: IEEE 802.11-13/0089r0
Submission
Frame for informing the update
• Option1: reusing reassociation request frame- Pros: reuse existing AP code for processing reassociation request - Cons: burden on overhead
• Option2: conditionally including the information into a existing frame- Pros: no need to define a new frame format and minimized overhead- Cons: need to clarify the usage from the original frame format (but easily
implemented as an option)- Suggestion: optionally adding listen interval field in the AID switch request frame
[3] Consideration on wakeup interval and listen interval
In the case of TIM STAs, wakeup interval (linked to AID group interval) in the AID request IE could replace listen interval because they should listen the beacon frame having the TIM segmentation.
For Non-TIM STAs, however, listen interval should be updated for power saving while wakeup interval would not be needed because they’re not going to listen the beacon frame having the TIM segmentation.
Conditional update by TIM to Non-TIM mode change: B3 set to 1 + 2 octet listen interval In the case of no AID switching, the reserved bit could be used to indicate the status
(possibly with other cases like addition or deletion, etc).
Jan 2013
Jinsoo Choi, LG ElectronicsSlide 6
doc.: IEEE 802.11-13/0089r0
Submission
Proposal
• A STA in power save mode can update the listen interval when it changes its operation mode from TIM to Non-TIM mode
• A STA may inform an AP of the updated listen interval and the AP may response to the STA
• The informing frame format can be designed as– Conditionally including the information into a existing frame (e.g.
AID switch request/response frame)
Jan 2013
Slide 7 Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
Conclusion
Jan 2013
Slide 8
• Listen interval update is needed when a STA changes its operation mode – Specifically required for TIM to Non-TIM mode change
• A STA may inform to AP the updated listen interval for helping AP’s operation such as buffering/discarding DL traffic – The informing frame should not cause critical overhead and need
to have a optimized format
Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
References
[1] 11-12-0891-00-00ah-aid-reassignment-for-tim-and-non-tim-modes-switching[2] 11-12-0656-01-00ah-extended-sleep-mode-for-battery-powered-stas[3] 11-12-1304-00-00ah-aid-assignment-protocol
Jan 2013
Slide 9 Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
Straw Poll - 1
• Do you support that a STA can update the listen interval when it changes its operation mode from TIM to Non-TIM mode?
Jan 2013
Slide 10 Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
Straw Poll - 2
• Do you support that a STA may inform to an AP its updated listen interval and the AP may response to the STA?
Jan 2013
Slide 11 Jinsoo Choi, LG Electronics
doc.: IEEE 802.11-13/0089r0
Submission
Straw Poll - 3
• Do you support that the updated listen interval is optionally included in an existing frame (e.g. conditional update at TIM to Non-TIM mode change in the AID switch request frame)
Jan 2013
Slide 12 Jinsoo Choi, LG Electronics