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doc.: IEEE 802.11-15/0880r1
Submission
Scheduled Trigger framesJuly 2015
Slide 1
Date: 2015-07-04
Authors: Name Affiliation Address Phone email
Alfred Asterjadhi
Qualcomm
5775 Morehouse Dr. San Diego, CA, USA
aasterja@qti.qualcomm.com
Simone Merlin smerlin@qti.qualcomm.com
Bin Tian btian@qti.qualcomm.com
Carlos Aldana 1700 Technology Drive San
Jose, CA 95110, USA caldana@qca.qualcomm.com
George Cherian 5775 Morehouse Dr. San
Diego, CA, USA
gcherian@qti.qualcomm.com
Gwendolyn Barriac gbarriac@qti.qualcomm.com
Hemanth Sampath hsampath@qti.qualcomm.com
Menzo Wentink
Straatweg 66-S Breukelen, 3621 BR Netherlands
mwentink@qti.qualcomm.com
Richard Van Nee rvannee@qti.qualcomm.com
Albert Van Zelst allert@qti.qualcomm.com
Rolf De Vegt 1700 Technology Drive San
Jose, CA 95110, USA rolfv@qca.qualcomm.com
Sameer Vermani 5775 Morehouse Dr. San
Diego, CA, USA svverman@qti.qualcomm.com
Tevfik Yucek 1700 Technology Drive San
Jose, CA 95110, USA
tyucek@qca.qualcomm.com
VK Jones vkjones@qca.qualcomm.com
Youhan Kim youhank@qca.qualcomm.com
1 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
July 2015
Slide 2
Authors (continued):
Name Affiliation Address Phone email
Wookbong Lee
LG Electronics
19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130,
Korea wookbong.lee@lge.com
Kiseon Ryu kiseon.ryu@lge.com
Jinyoung Chun jiny.chun@lge.com
Jinsoo Choi js.choi@lge.com
Jeongki Kim jeongki.kim@lge.com
Giwon Park giwon.park@lge.com
Dongguk Lim dongguk.lim@lge.com
Suhwook Kim suhwook.kim@lge.com
Eunsung Park esung.park@lge.com
HanGyu Cho hg.cho@lge.com
Shahrnaz Azizi
Intel
2200 Mission College Blvd, Santa Clara, CA 95054
shahrnaz.azizi@intel.com
Eldad Perahia eldad.perahia@intel.com
Robert Stacey 2111 NE 25th Ave, Hillsboro
OR 97124, USA +1-503-724-893 robert.stacey@intel.com
Po-Kai Huang po-kai.huang@intel.com
Qinghua Li quinghua.li@intel.com
Xiaogang Chen xiaogang.c.chen@intel.com
Chittabrata Ghosh chittabrata.ghosh@intel.com
Rongzhen Yang rongzhen.yang@intel.com
Laurent cariou laurent.cariou@intel.com
1 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission Slide 3
Authors (continued)Name Affiliation Address Phone email
Ron Porat
Broadcom
rporat@broadcom.com
Matthew Fischer mfischer@broadcom.com
Sriram Venkateswaran
Tu Nguyen
Vinko Erceg
Lei Wang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054
858-205-7286 Leileiw@marvell.com
Hongyuan Zhang
hongyuan@marvell.com
Yakun Sun yakunsun@marvell.com
Liwen Chu liwenchu@marvell.com
Jinjing Jiang jinjing@marvell.com
Yan Zhang yzhang@marvell.com
Rui Cao ruicao@marvell.com
Sudhir Srinivasa sudhirs@marvell.com
Saga Tamhane sagar@marvell.com
Mao Yu my@marvel..com
Edward Au edwardau@marvell.com
Hui-Ling Lu hlou@marvell.com
1
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission Slide 4
Authors (continued)
James Yee
Mediatek
No. 1 Dusing 1st Road, Hsinchu, Taiwan
+886-3-567-0766 james.yee@mediatek.com
Alan Jauh alan.jauh@mediatek.com
Chingwa Hu chinghwa.yu@mediatek.com
Frank Hsu frank.hsu@mediatek.com
` 1 Thomas Pare
Mediatek USA
2860 Junction Ave, San Jose, CA 95134, USA
+1-408-526-1899 thomas.pare@mediatek.com
ChaoChun Wang chaochun.wang@mediatek.com
James Wang james.wang@mediatek.com
Jianhan Liu Jianhan.Liu@mediatek.com
Tianyu Wu tianyu.wu@mediatek.com
Russell Huang russell.huang@mediatek.com
` 1
Name Affiliation Address Phone email
1
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission Slide 5
Authors (continued)
Name Affiliation Address Phone email
Phillip Barber
Huawei
The Lone Star State, TX pbarber@broadbandmobiletech.com
Peter Loc peterloc@iwirelesstech.com
Le Liu F1-17, Huawei Base, Bantian,
Shenzhen +86-18601656691 liule@huawei.com
Jun Luo 5B-N8, No.2222 Xinjinqiao
Road, Pudong, Shanghai jun.l@huawei.com
Yi Luo F1-17, Huawei Base, Bantian,
Shenzhen +86-18665891036 Roy.luoyi@huawei.com
Yingpei Lin 5B-N8, No.2222 Xinjinqiao
Road, Pudong, Shanghai linyingpei@huawei.com
Jiyong Pang 5B-N8, No.2222 Xinjinqiao
Road, Pudong, Shanghai pangjiyong@huawei.com
Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA 92121
NA zhigang.rong@huawei.com
Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Rob.Sun@huawei.com
David X. Yang F1-17, Huawei Base, Bantian,
Shenzhen david.yangxun@huawei.com
Yunsong Yang 10180 Telesis Court, Suite 365, San Diego, CA 92121
NA yangyunsong@huawei.com
Zhou Lan F1-17, Huawei Base, Bantian,
SHenzhen +86-18565826350 Lanzhou1@huawei.com
Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada
Junghoon.Suh@huawei.com
Jiayin Zhang 5B-N8, No.2222 Xinjinqiao
Road, Pudong, Shanghai +86-18601656691 zhangjiayin@huawei.com
1
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission Slide 6
Authors (continued)Name Affiliation Address Phone email
Thomas Derham Orange
thomas.derham@orange.com
1 Yasushi Takatori
NTT
1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan
takatori.yasushi@lab.ntt.co.jp
Yasuhiko Inoue inoue.yasuhiko@lab.ntt.co.jp
Yusuke Asai asai.yusuke@lab.ntt.co.jp
Koichi Ishihara ishihara.koichi@lab.ntt.co.jp
Akira Kishida kishida.akira@lab.ntt.co.jp
Akira Yamada
NTT DOCOMO
3-6, Hikarinooka, Yokosuka-shi, Kanagawa, 239-8536,
Japan yamadaakira@nttdocomo.co
m
Fujio Watanabe 3240 Hillview Ave, Palo
Alto, CA 94304 watanabe@docomoinnovatio
ns.com
Haralabos Papadopoulos
hpapadopoulos@docomoinnovations.com
1 Fei Tong
Samsung
Innovation Park, Cambridge CB4 0DS (U.K.)
+44 1223 434633 f.tong@samsung.com
Hyunjeong Kang Maetan 3-dong; Yongtong-Gu
Suwon; South Korea +82-31-279-9028 hyunjeong.kang@samsung.co
m
Kaushik Josiam 1301, E. Lookout Dr, Richardson TX 75070
(972) 761 7437 k.josiam@samsung.com
Mark Rison Innovation Park,
Cambridge CB4 0DS (U.K.) +44 1223 434600 m.rison@samsung.com
Rakesh Taori 1301, E. Lookout Dr, Richardson TX 75070
(972) 761 7470 rakesh.taori@samsung.com
Sanghyun Chang Maetan 3-dong; Yongtong-Gu
Suwon; South Korea +82-10-8864-
1751 s29.chang@samsung.com
1
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission Slide 7
Authors (continued)
Name Affiliation Address Phone email
Bo Sun
ZTE
#9 Wuxingduan, Xifeng Rd Xian, China
sun.bo1@zte.com.cn
Kaiying Lv lv.kaiying@zte.com.cn
Yonggang Fang
Ke Yao
Weimin Xing
Brian Hart Cisco Systems
170 W Tasman Dr, San Jose, CA 95134
brianh@cisco.com
Pooya Monajemi pmonajem@cisco.com
Joonsuk Kim
Apple
joonsuk@apple.com
Aon Mujtaba mujtaba@apple.com
Guoqing Li guoqing_li@apple.com
Eric Wong ericwong@apple.com
Chris Hartman chartman@apple.com
1
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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 STA’s TWT request
July 2015
Slide 8 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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
• “Solicited” trigger TWT:– A STA requests the AP to schedule TFs (using TWT request)
• TWT pattern is based on STA’s UL traffic pattern and QoS requirements– The pattern can be periodic or aperiodic
– The AP responds confirming or providing alternative TWT schedules• The AP allocates its resources based on multiple STA’s information
– STAs with similar traffic pattern can be allocated in similar TWTs, with similar TWT service periods (SPs), and other similar parameters
July 2015
Slide 9
Beacon
TF
Next TWT Beacon
TF
TF
TF
TWT element: Implicit TWT, Next TWT, TWT Wake Interval
TWT Wake Interval
DL/ULMU
DL/ULMU
DL/ULMU
DL/ULMU
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
Solicited Trigger TWT
• Trigger TWT setup (negotiated):– 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
• 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– DL BU availability is notified during the TWT SP itself.– STAs can renegotiate their TWTs when a traffic pattern changes
July 2015
Slide 10
STA 1 STA 2 Poll 4Poll 2
Trigger
Poll 1
STA 4
TWT Wake Interval
TWT SP
Next TWT(s)TWT Setup(s)
Ack
Trigger
BU 1BU 2BU 4
BA 1
BA 2BA 4
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
Broadcast Trigger TWT
• 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
• 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.
July 2015
Slide 11
AP
STA1, STA2
Target trans. Time 1
SIFS
Awake State
SIFS
STA1, STA2 STA1, STA2
TWT Req
TIMBeacon
TWT Res
TFDL MU Data
UL MUPS-Poll
▪ ▪ ▪
▪ ▪ ▪
▪ ▪ ▪
▪ ▪ ▪
TIMBeacon
TIMBeacon
Target TBTT Listen Interval
(Target TBTT, Listen Interval)
Doze Doze Doze Doze
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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
July 2015
Slide 12 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
TWT element
• Define a Triggered subfield in the Request Type field of the TWT element:– 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– Which requires the use of TACK/STACK/BAT frames
– Hence, here we focus only on the implicit TWT
July 2015
Slide 13
B0 B1 B3 B4 B5 B6 B7 B9 B10 B14 B15
TWT Request
TWT Setup Command
ReservedTriggered Implicit Flow Type TWT Flow
IdentifierWake Interval
Exponent TWT Protection
Bits: 1 3 1 1 1 3 5 1
Element ID Length Control Request
Type
TargetWake Time
TWT Group
Assignment
Nominal Minimum
Wake Duration
TWT Wake Interval Mantissa
TWT Channel
NDP Paging
(optional)
Octets: 1 1 1 2 8 or 0 9 or 3 or 0 1 2 1 0 or 4
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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]
July 2015
Slide 14 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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
Slide 15
July 2015
A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
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
July 2015
Slide 16 A. Asterjadhi, H. Choi, et. al.
doc.: IEEE 802.11-15/0880r1
Submission
References
[1] M. Fischer (Broadcom) et. al., 11-12-0823-00-00ah-targetwaketime
Slide 17
July 2015
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