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doc.: IEEE 802.11-15/1122r0
Submission
Identifiers in HE PPDUs for power saving
Slide 1
Date: 2015-09-12Authors: Name Affiliation Address Phone email
Alfred Asterjadhi
Qualcomm
5775 Morehouse Dr. San Diego, CA, USA
Simone Merlin [email protected]
Bin Tian [email protected]
Carlos Aldana 1700 Technology Drive San Jose, CA 95110, USA [email protected]
George Cherian 5775 Morehouse Dr. San
Diego, CA, USA
Gwendolyn Barriac [email protected]
Hemanth Sampath [email protected]
Menzo Wentink
Straatweg 66-S Breukelen, 3621 BR Netherlands
Richard Van Nee [email protected]
Albert Van Zelst [email protected]
Rolf De Vegt 1700 Technology Drive San Jose, CA 95110, USA [email protected]
Sameer Vermani 5775 Morehouse Dr. San Diego, CA, USA [email protected]
Tevfik Yucek 1700 Technology Drive San
Jose, CA 95110, USA
VK Jones [email protected]
Youhan Kim [email protected]
1 Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Slide 2
Authors (continued):Name Affiliation Address Phone email
Kiseon Ryu
LG Electronics
19, Yangjae-daero 11gil, Seocho-gu, Seoul 137-130,
Korea [email protected]
Hyeyouong Choi [email protected]
Jinyoung Chun [email protected]
Jinsoo Choi [email protected]
Jeongki Kim [email protected]
Giwon Park [email protected]
Dongguk Lim [email protected]
Suhwook Kim [email protected]
Eunsung Park [email protected]
HanGyu Cho [email protected]
Jinmin Kim [email protected]
Shahrnaz Azizi
Intel
2200 Mission College Blvd, Santa Clara, CA 95054 [email protected]
Eldad Perahia [email protected]
Robert Stacey 2111 NE 25th Ave, Hillsboro OR 97124, USA +1-503-724-893 [email protected]
Po-Kai Huang [email protected]
Qinghua Li [email protected]
Xiaogang Chen [email protected]
Chittabrata Ghosh [email protected]
Rongzhen Yang [email protected]
Laurent cariou [email protected]
1 Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Slide 3
Authors (continued)Name Affiliation Address Phone email
Ron Porat
Broadcom
Matthew Fischer [email protected]
Sriram Venkateswaran
Tu Nguyen
Vinko Erceg
Lei Wang
Marvell
5488 Marvell Lane, Santa Clara, CA, 95054 858-205-7286 [email protected]
Hongyuan Zhang [email protected]
Yakun Sun [email protected]
Liwen Chu [email protected]
Jinjing Jiang [email protected]
Yan Zhang [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
Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Slide 4
Authors (continued)
James Yee
Mediatek
No. 1 Dusing 1st Road, Hsinchu, Taiwan +886-3-567-0766 [email protected]
Alan Jauh [email protected]
Chingwa Hu [email protected]
Frank Hsu [email protected]
` 1 Thomas Pare
Mediatek USA
2860 Junction Ave, San Jose, CA 95134, USA +1-408-526-1899 [email protected]
ChaoChun Wang [email protected]
James Wang [email protected]
Jianhan Liu [email protected]
Tianyu Wu [email protected]
Russell Huang [email protected]
` 1
Name Affiliation Address Phone email 1
Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Slide 5
Authors (continued)Name Affiliation Address Phone email
Phillip Barber
Huawei
The Lone Star State, TX [email protected]
Peter Loc [email protected]
Le Liu F1-17, Huawei Base, Bantian, Shenzhen +86-18601656691 [email protected]
Jun Luo 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai [email protected]
Yi Luo F1-17, Huawei Base, Bantian, Shenzhen +86-18665891036 [email protected]
Yingpei Lin 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai [email protected]
Jiyong Pang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai [email protected]
Zhigang Rong 10180 Telesis Court, Suite 365, San Diego, CA 92121
Rob Sun 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada [email protected]
David X. Yang F1-17, Huawei Base, Bantian, Shenzhen [email protected]
Yunsong Yang 10180 Telesis Court, Suite 365, San Diego, CA 92121
Zhou Lan F1-17, Huawei Base, Bantian, SHenzhen +86-18565826350 [email protected]
Junghoon Suh 303 Terry Fox, Suite 400 Kanata, Ottawa, Canada [email protected]
Jiayin Zhang 5B-N8, No.2222 Xinjinqiao Road, Pudong, Shanghai +86-18601656691 [email protected]
1 Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Slide 6
Authors (continued)Name Affiliation Address Phone email
Thomas Derham Orange
1 Yasushi Takatori
NTT
1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan [email protected]
Yasuhiko Inoue [email protected]
Yusuke Asai [email protected]
Koichi Ishihara [email protected]
Akira Kishida [email protected]
Akira Yamada
NTT DOCOMO
3-6, Hikarinooka, Yokosuka-shi, Kanagawa, 239-8536,
Japan [email protected]
m
Fujio Watanabe 3240 Hillview Ave, Palo Alto, CA 94304 watanabe@docomoinnovatio
ns.com
Haralabos Papadopoulos hpapadopoulos@docomoinno
vations.com
1 Fei Tong
Samsung
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
+82-10-8864-1751 [email protected]
1 Alfred Asterjadhi, et. al.
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doc.: IEEE 802.11-15/1122r0
Submission Slide 7
Authors (continued)
Name Affiliation Address Phone email
Bo Sun
ZTE
#9 Wuxingduan, Xifeng Rd Xian, China [email protected]
Kaiying Lv [email protected]
Yonggang Fang
Ke Yao
Weimin Xing
Brian Hart Cisco Systems
170 W Tasman Dr, San Jose, CA 95134 [email protected]
Pooya Monajemi [email protected]
Joonsuk Kim
Apple
Aon Mujtaba [email protected]
Guoqing Li [email protected]
Eric Wong [email protected]
Chris Hartman [email protected]
1
Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Introduction
• Currently, PHY is discussing populating SIG-A and SIG-B– An identifier of the BSS (e.g., BSS COLOR) is proposed in SIG-A that is
• Beneficial for spatial reuse as discussed in [1] • Beneficial for power save as discussed in this presentation
– Other identifiers, such as the (set) receiver(s) is likely to be present in the SIG-B field of HE DL MU PPDUs• However, it is not clear whether it will be present in the other cases
• In addition to the BSS COLOR field, we propose SIG-A to contain an UL/DL Flag field to:– Enable intra-PPDU power saving
Slide 8
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Proposed Identifiers in PHY header
• BSS COLOR field is proposed for the SIG-A field of an HE PPDU– The BSS COLOR contains a non-unique value that identifies the BSS
• All HE PPDUs generated by BSS’s members have same value– A STA that receives an HE PPDU with a BSS COLOR equal to its BSS
classifies it as a member PPDU– Otherwise, it classifies it as a nonmember PPDU
• UL/DL Flag field is proposed for the SIG-A field of an HE PPDU:– The UL/DL Flag indicates whether the frame is Uplink or Downlink
Slide 9
September 2015
Legacy Preamble(L-SIG)
HE Preamble(RL-SIG, SIG-A, SIG-B, …)
PSDU((A-)MPDU)
Identifiers: COLOR, RA, TA, …
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Considerations on power save
• A non-AP STA that has declared to its AP to be in Awake state– Can go to sleep for a duration of time only if:
• The AP is not going to transmit a frame to that STA during that duration of time• E.g., the AP is busy communicating exclusively with other devices
• For the purpose of this proposal we focus on intra-PPDU power save– After decoding the PHY header of a PPDU, the STA can sleep for the PSDU duration only if
• The PPDU is a member PPDU and is not intended for the STA
• Hence, the non-AP STA is not allowed to sleep for the duration of a PSDU that:– Is contained in a non-member PPDU– Is contained in a member PPDU intended for the STA
Slide 10
September 2015
UL PPDU STA 2
PS state as known at AP (Awake)
STA 1 state
DL PPDU STA 2
UL PPDU
DL PPDU STA 1
DL PPDU
DL PPDU STA 4
OBSS Activity
BSS Activity
Doze
Awake
UL PPDU STA 7
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Can BSS COLOR alone enable intra-PPDU PS?
• Assuming that only the BSS COLOR field is available in the PHY header:– The STA could go to sleep only if the received frame is a non-member PPDU
• But by doing so it could end up sleeping while the AP happens to transmit to it, missing the frame!– In general, it is not a good idea to do so as it increases transmission failures
• In addition, BSS COLOR does not differentiate if the PPDU is intended to the STA– Hence, the STA cannot go to sleep during the PSDUs that are:
• Transmitted by the AP and intended to other associated STAs (basically all BSS DL traffic minus 1)• Transmitted by other associated STAs intended to the AP (basically all BSS UL traffic)
– Activating intra-PPDU PS for these PSDUs is very beneficial • A STA is expected to receive frames generated within the BSS very frequently
• Hence, BSS COLOR alone does not provide information to enable intra-PPDU PS– Because the STA at least needs to know that the PPDU is not intended for it– Additional identifiers can help (see next slide)Slide 11
September 2015
Legacy Preamble(L-SIG)
HE Preamble(RL-SIG, SIG-A, SIG-B, …)
PSDU((A-)MPDU)
Identifiers: COLOR, RA, TA, …Sleep if member-PPDU…
PPDU intended to non-AP STA
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Intra-PPDU PS enhancements
• When both BSS COLOR field and UL/DL Flag are available:– Non-AP STA determines if the member PPDU is uplink or downlink
• The STA can go to sleep for all member PPDUs that are uplink (only UL)
• Hence, the addition of UL/DL Flag is beneficial for intra-PPDU PS– Non-AP STAs can sleep during all UL member PSDUs not intended to it
• Note: A STA still has to receive DL member PPDUs not intended to it – I.e., no intra-PPDU PS is possible for these frames– An identifier of the intended receiver helps in this case,
• Pros and cons of this case are currently under investigation
Slide 12
September 2015
doc.: IEEE 802.11-15/1122r0
Submission
Summary
• We propose adding a BSS COLOR field and an UL/DL Flag field in the common portion of the HE PHY header to enable intra PPDU power saving for HE STAs
Slide 13 Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Straw Poll 1
• Do you support to add to the SFD:– The spec shall support adding a BSS COLOR field in the SIG-A field
• The BSS COLOR field is an identifier of the BSS (size TBD)
Slide 14
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Straw Poll 2
• Do you support adding the following rules to the SFD:– An HE non-AP STA may enter the Doze state until the end of an HE DL
MU PPDU if:• the value of the PPDU’s BSS COLOR field is equal to the BSS COLOR of its
BSS, and• the value derived from any of the STA Identifiers in the SIG-B field does not
match its own identifier or that of a broadcast/multicast identifier– An HE non-AP STA may enter the Doze state until the end of an HE UL
MU PPDU if:• the value of the PPDU’s BSS COLOR field is equal to the BSS COLOR of its
BSS
Slide 15
September 2015
doc.: IEEE 802.11-15/1122r0
Submission
Straw Poll 3
• Do you support adding an UL/DL Flag field in the SIG-A of an HE SU PPDU?– The UL/DL Flag indicates whether the frame is Uplink or Downlink
• The value of this field for TDLS is TBD
Slide 16 Alfred Asterjadhi, et. al.
September 2015
doc.: IEEE 802.11-15/1122r0
Submission Alfred Asterjadhi, et. al.
Straw Poll 4
• Do you support to add the following rules to the SFD:– An HE STA may enter the Doze state until the end of an HE SU PPDU if:
• the value of the PPDU’s BSS COLOR field is equal to the BSS COLOR of its BSS, and
• the value of the UL/DL Flag field indicates that the frame is uplink
Slide 17
September 2015
doc.: IEEE 802.11-15/1122r0
Submission
References
[1] R. Porat (Broadcom), et, al, 11-14-0082-00-0hew-Improved-Spatial-Reuse-Feasibility-Part-I[2] 11-15/0314r2 Sleep States in IEEE 802.11ax Simulation Scenarios
Slide 18
September 2015
Alfred Asterjadhi, et. al.
