Scheduled Trigger frames - IEEE Standards Association

Scheduled Trigger frames - IEEE Standards Association

July 2015 doc.: IEEE 802.11-15/0880r2 Scheduled Trigger frames Date: 2015-07-04 Authors: Name Affiliation Address Phone Alfred Asterjadhi [email protected] 5775 Morehouse Dr. San Diego, CA, USA Simone Merlin Bin Tian [email protected] [email protected] 1700 Technology Drive San Jose, CA 95110, USA Carlos Aldana George Cherian 5775 Morehouse Dr. San Diego, CA, USA Gwendolyn Barriac [email protected] [email protected] [email protected] Hemanth Sampath [email protected] Menzo Wentink [email protected] Richard Van Nee Qualcomm Straatweg 66-S Breukelen, 3621 BR Netherlands Albert Van Zelst Rolf De Vegt Sameer Vermani Tevfik Yucek VK Jones [email protected] [email protected] 1700 Technology Drive San Jose, CA 95110, USA 5775 Morehouse Dr. San Diego, CA, USA 1700 Technology Drive San Jose, CA 95110, USA Youhan Kim

1 Submission email [email protected] [email protected] [email protected] [email protected] [email protected] Slide 1 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Authors (continued): Name Affiliation Address Phone 19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130, Korea Kiseon Ryu [email protected] Hyeyouong Choi [email protected] Jinyoung Chun [email protected] Jinsoo Choi [email protected] Jeongki Kim Giwon Park [email protected] LG Electronics giwon[email protected] Dongguk Lim [email protected] Suhwook Kim [email protected] Eunsung Park [email protected] HanGyu Cho [email protected] Jinmin Kim [email protected]

2200 Mission College Blvd, Santa Clara, CA 95054 Shahrnaz Azizi [email protected] Eldad Perahia [email protected] 2111 NE 25th Ave, Hillsboro OR 97124, USA Robert Stacey Po-Kai Huang Qinghua Li Submission 1 email +1-503-724-893 [email protected] [email protected] Intel [email protected] Xiaogang Chen [email protected] Chittabrata Ghosh [email protected] Rongzhen Yang [email protected] Laurent cariou [email protected] Slide 2 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Authors (continued) Name Affiliation Address Phone email Ron Porat [email protected] Matthew Fischer [email protected]

Sriram Venkateswaran Broadcom Tu Nguyen Vinko Erceg 5488 Marvell Lane, Santa Clara, CA, 95054 Lei Wang 858-205-7286 [email protected] Hongyuan Zhang [email protected] Yakun Sun [email protected] Liwen Chu [email protected] Jinjing Jiang [email protected] Yan Zhang Marvell [email protected] Rui Cao [email protected] Sudhir Srinivasa [email protected] Saga Tamhane [email protected] Mao Yu [email protected] Edward Au [email protected] Hui-Ling Lu [email protected] 1 Submission Slide 3 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Authors (continued)

Name 1 Affiliation James Yee Address No. 1 Dusing 1st Road, Hsinchu, Taiwan Phone +886-3-567-0766 Alan Jauh email [email protected] [email protected] Mediatek 1 Chingwa Hu [email protected] Frank Hsu [email protected] 2860 Junction Ave, San Jose, CA 95134, USA ` Thomas Pare +1-408-526-1899 [email protected] m ChaoChun Wang James Wang Jianhan Liu 1 [email protected] [email protected] Mediatek USA [email protected] Tianyu Wu [email protected] Russell Huang [email protected] ` Submission Slide 4 A. Asterjadhi, H. Choi, et. al. July 2015

doc.: IEEE 802.11-15/0880r2 Authors (continued) Name Affiliation Phillip Barber Address Phone [email protected] ch.com The Lone Star State, TX Peter Loc [email protected] Le Liu F1-17, Huawei Base, Bantian, Shenzhen Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Yi Luo F1-17, Huawei Base, Bantian, Shenzhen Yingpei Lin 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai Jiyong Pang Zhigang Rong Rob Sun David X. Yang Yunsong Yang Zhou Lan email Huawei +86-18601656691 [email protected] +86-18665891036 Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai [email protected] [email protected] 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA

303 Terry Fox, Suite 400 Kanata, Ottawa, Canada F1-17, Huawei Base, Bantian, Shenzhen 10180 Telesis Court, Suite 365, San Diego, CA 92121 NA F1-17, Huawei Base, Bantian, SHenzhen [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] +86-18565826350 [email protected] [email protected] +86-18601656691 [email protected] 1 Submission Slide 5 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Authors (continued) Name Thomas Derham 1 Affiliation Address Phone Orange [email protected] 1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan Yasushi Takatori takatori.ya[email protected] Yasuhiko Inoue Yusuke Asai email [email protected] NTT [email protected] Koichi Ishihara

[email protected] Akira Kishida [email protected] Akira Yamada Fujio Watanabe NTT DOCOMO 3-6, Hikarinooka, Yokosukashi, Kanagawa, 239-8536, Japan [email protected] m 3240 Hillview Ave, Palo Alto, CA 94304 [email protected] ns.com Haralabos Papadopoulos 1 [email protected] vations.com Fei Tong Innovation Park, Cambridge CB4 0DS (U.K.) +44 1223 434633 [email protected] Hyunjeong Kang Maetan 3-dong; Yongtong-Gu Suwon; South Korea +82-31-279-9028 [email protected] m Kaushik Josiam 1301, E. Lookout Dr, Richardson TX 75070 (972) 761 7437 [email protected] Mark Rison Innovation Park, Cambridge CB4 0DS (U.K.) +44 1223 434600 [email protected] Rakesh Taori 1301, E. Lookout Dr, Richardson TX 75070 (972) 761 7470

[email protected] Sanghyun Chang Maetan 3-dong; Yongtong-Gu Suwon; South Korea +82-10-88641751 [email protected] Samsung 1 Submission Slide 6 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Authors (continued) Name Affiliation Address Phone #9 Wuxingduan, Xifeng Rd Xian, China Bo Sun [email protected] Kaiying Lv Yonggang Fang email [email protected] ZTE Ke Yao Weimin Xing Brian Hart Pooya Monajemi Cisco Systems 170 W Tasman Dr, San Jose, CA 95134 [email protected] [email protected] Joonsuk Kim [email protected] Aon Mujtaba Guoqing Li [email protected] Apple [email protected] Eric Wong

[email protected] Chris Hartman [email protected] 1 Submission Slide 7 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Introduction MU procedures are under discussion in 11ax The AP enables multiple STAs to transmit UL frames via Trigger frames (TFs) MU STAs wait for the TF prior to transmitting UL frames Upon reception of a TF intended to them they can transmit to the AP In this presentation we focus on trigger frame scheduling with TWT signaling [1] This way we also enable other useful operation modes for power save that fit in the 11ax use cases I.e., STAs wake up only in the allocated TWT SP and can sleep outside of them For simplicity, we focus on the implicit TWT operation which enables: Broadcast TWT: Scheduled by the AP, irrespective of TWT requests, and indicated in the Beacon for multiple STAs (a generic scheduling mechanism that covers operation in [1]) Solicited TWT: Scheduled by the AP, accounting for the STAs TWT request Submission Slide 8 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Basics of Trigger TWTs Broadcast trigger TWT: AP indicates the target trigger times in a TWT response included in the Beacon The pattern can be periodic, aperiodic (i.e., single indication for multiple Trigger frames) The pattern is only valid for the Beacon Interval following the Beacon. The AP can indicate the broadcast trigger TWTs during a TWT Setup Next TWT B e a c o

n TWT Wake Interval T F DL/ ULMU T F DL/ ULMU T F DL/ ULMU T F DL/ ULMU B e a c o n TWT element: Implicit TWT, Next TWT, TWT Wake Interval Solicited trigger TWT: A STA requests the AP to schedule TFs (using TWT request) TWT pattern is based on STAs UL traffic pattern and QoS requirements The AP responds confirming or providing alternative TWT schedules The AP allocates its resources based on multiple STAs information Submission The pattern can be periodic or aperiodic STAs with similar traffic pattern can be allocated in similar TWTs, with similar TWT service periods (SPs), and other similar parameters Slide 9 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Solicited Trigger TWT TWT Setup(s) Next TWT(s) STA 1

STA 2 BA 1 BA 2 BA 4 TWT Wake Interval Setup of TWT parameters is the same as for basic TWT operation with the following additions: The HE non-AP STA may request scheduling of a TF at the start of each TWT The AP confirms scheduling of a TF at the start of each TWT Trigger TWT operation: AP schedules a TF at the beginning of each TWT SP Non-AP STAs wake up at the TWT, wait for the TF and get ready for MU DL/UL exchange Poll 1 Poll 2 Poll 4 T ri BU 1 A g c BU 2 g k BU 4 e r SP TWT Trigger TWT setup (negotiated): STA 4 T ri g g e r STAs are not supposed to contend during the TWT SP but rather wait for the TFs sent by the AP During the TWT SP, STAs can exchange PS-Polls, APSD trigger frames, UL/DL BUs, etc. upon reception of TFs. STAs that negotiate TWT need not wake up to read the Beacon frame Submission DL BU availability is notified during the TWT SP itself. STAs can renegotiate their TWTs when a traffic pattern changes Slide 10 A. Asterjadhi, H. Choi, et. al. July 2015

doc.: IEEE 802.11-15/0880r2 Broadcast Trigger TWT (Target TBTT, Listen Interval) STA1, STA2 STA1, STA2 TIM Beac on TWT Res Target trans. Time 1 TF SIFS DL MU Data TIM Beac on TIM Beac on AP Awake State TWT Req STA1, STA2 SIFS Doze Doze Target TBTT UL MU PSPoll Doze Doze Listen Interval TWT setup for broadcast trigger TWT TWT request/response can be exchanged by a STA and an AP to negotiate the target Beacon

frame monitored by the PS STA. Example of operation Submission A STA sends a TWT Request to request the broadcast trigger TWT operation. An AP sends a TWT Response including the Target Wake Time set to the target TBTT and TWT Wake Interval set to the ListenInterval of the STA. A STA monitors the Beacon frame with the period of TWT Wake Interval (ListenInterval) from the time of Target Wake Time (target TBTT). If a STA receives the target trigger times in a TWT response included in the Beacon, the STA may save its power till the time and the STA wakes up at the target trigger time to receive the Trigger frame. Otherwise, the STA save its power according to TWT Wake Interval. Note. It is applicable to PS STAs which should monitor the TIM Beacon frame with certain periodicity. Slide 11 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Benefits of TWTs TWT scheduling improves power saving for the SU case as exemplified in [1] It also eases contention as the STAs should not access the medium outside the TWT SPs For the MU case, the STA indicates/negotiates with the AP: The TWT SPs during which it is active and the rest of the times during which it is inactive Similar benefits to the SU case: STAs save power, eases channel contention, To send TFs at the start of the TWT SPs Enables MU operation during the TWT SP and protects the medium access for the STA Increases throughput as transmissions are protected at the receiver Increases network efficiency due to MU transmissions and reducing collisions The AP uses the TWT scheduling to: Spread out the wake up and access times of the STAs easing contention Allocate MU resources more efficiently (as it can be based on received feedback) Avoids allocating resources to STAs with no UL data Submission Slide 12 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 TWT element Element ID Length Control Request Type

Target Wake Time TWT Group Assignment Nominal Minimum Wake Duration TWT Wake Interval Mantissa TWT Channel NDP Paging (optional) 1 1 1 2 8 or 0 9 or 3 or 0 1 2 1 0 or 4 Octets: B0 Bits: B3 B4 B5 B6 B7 B9 B10 B14 B15 TWT Request TWT Setup Command Reserved Triggered Implicit

Flow Type TWT Flow Identifier Wake Interval Exponent TWT Protection 1 3 1 1 1 3 5 1 Define a Triggered subfield in the Request Type field of the TWT element: B1 Set to 1 in a TWT Request to request for a TF at the start of the TWT Set to 1 in a TWT Response to indicate that a TF will be scheduled at the start of the TWT Most of the use cases for 11ax seem to be covered by implicit TWT setup So suggestion is that for 11ax the Implicit field of the TWT element be set to 1 Some more evaluations are needed to understand the benefits of explicit TWT Submission Which requires the use of TACK/STACK/BAT frames Hence, here we focus only on the implicit TWT Slide 13 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Summary of Trigger TWT Define implicit TWT operation for 11ax that enables: Solicited TWT: STA and the AP negotiate the TWT parameters STA sends TWT request and AP responds with a TWT response Broadcast TWT: AP indicates to STAs the TWT parameters AP sends TWT response to the STAs without receiving TWT requests The proposed Trigger TWT procedure Inherits the power saving properties of the TWT protocol [1] Submission Slide 14

A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Straw Poll #1 Do you support to add the following text in the SFD: The spec shall include a mechanism that allows a target transmission time for a Trigger frame to be indicated. The mechanism is based on implicit TWT operation and additionally enables: Broadcast triggered TWT by including a TWT element in the Beacon Solicited triggered TWT by using implicit TWT negotiation procedure Yes No Abstain Submission Slide 15 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 Straw Poll #2 Do you support to add the following text in the SFD: When the broadcast triggered TWT is enabled, STA and AP may exchange TWT request/response to indicate the target Beacon frame to be monitored by the PS STA. Yes No Abstain Submission Slide 16 A. Asterjadhi, H. Choi, et. al. July 2015 doc.: IEEE 802.11-15/0880r2 References [1] M. Fischer (Broadcom) et. al., 11-12-0823-00-00ah-targetwaketime Submission Slide 17

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