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Jan 2012 doc.: IEEE 11-12/69r2
ZTE CorporationSlide 1
Consideration on Max Idle Period Extension for 802.11ah Power Save
Date: 2012-01-19
Name Affiliations Address Phone email Dezhi Zhang ZTE Corporation
E3048,Bibo Rd,Pudong, shanghai,china
+86-13816335629
Lin Wang ZTE Corporation ZTE Plaza,No.19,East Huayuan Road, Haidian District, Beijing,China
+86- 13811485019
Junjian Zhang ZTE Corporation No 50 software avenue,Yuhuatai district, Nanjing ,China
+86-13585108157
Boshan Zhang ZTE Corporation E3048,Bibo Rd,Pudong, shanghai,china
+86-13916146095
Zhendong Luo CATR No.52 Huayuan Beilu，Beijing，100191
86-01-62300171 [email protected]
Daning Gong CATR No.52 Huayuan Beilu，Beijing，100191
86-01-62300156 [email protected]
Authors:
Submission
Jan 2012 doc.: IEEE 11-12/69r2
ZTE CorporationSlide 2
Abstract
The target of this presentation is to provide some considerations on Max Idle Period extension for 802.11ah power save.
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Transmission Characteristics of 11ah Use Case [1]
No.
Use Cases STA/AP communication Traffic type STA Capacity
1a Smart Grid 2-way (meter data & control) Continuous/periodic/burst 6000
1c Environ./Agri. Mon.
2-way (monitoring data and control; mostly monitoring)
Periodic, event-based 300
1d Industrial Process Automation
2-way (meter data & control) Periodic (0.1s~100s), Burst 500
1e Indoor Healthcare System
2-way (meter data & control) Periodic, event-based 50
1f Healthcare/Fitness 2-way (meter data & control) •Periodic: few 100 bytes every minute• Event-based: few 100 bytes per event
50 (multi-story center can have higher density)
1g Home/Building Automation/Control
2-way (meter data & control) 50~100
1h Temperature Sensor Network
2-way (meter data & control) Periodic, event-based 5~20
3a Outdoor Extended Range Hot Spot
2-way (meter data & control) Burst/permanent 50
3b Outdoor Wi-Fi for Cellular Offloading
2-way (meter data & control) Burst/permanent 50ZTE CorporationSlide 3
Submission
Jan 2012 doc.: IEEE 11-12/69r2
• In this presentation, we discuss the power save for 11ah use cases with Very long reporting interval and little downlink control message transfer, for example,
• Gas detector only need to transfer alarm message & data to AP, the detector potentially may sleep several days or even longer.
• In some smart grid use cases, meters report the data with very long period (more than one day) for only charge requirement.
Slide 4 ZTE Corporation
Motivation
Current 11v BSS Max Idle Period management scheme couldn’t satisfy the requirements of these 11ah use cases.
• All of STAs in the BSS are deployed the same Max Idle Period by the AP;
• The length of Max Idle Period is less than 1 day (~18.64hrs)
Current 11v BSS Max Idle Period management scheme couldn’t satisfy the requirements of these 11ah use cases.
• All of STAs in the BSS are deployed the same Max Idle Period by the AP;
• The length of Max Idle Period is less than 1 day (~18.64hrs)
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Problems of support both mobile devices and sensors
• In current BSS Max Idle Period management scheme, all of STAs in the BSS are deployed the same Max Idle Period by the AP.
• If 11ah sensors are set to the same value of several minutes as mobile phone,
• It will be a big power consumption for 11ah battery-powered sensors.
• There may be a large number of keep-alive messages occupy the channel resources frequently, channel access competition and access delay may be a big problem.
ZTE CorporationSlide 5
To save power of sensors in these use cases, AP should support multiple max idle period management scheme To save power of sensors in these use cases, AP should support multiple max idle period management scheme
Submission
Jan 2012 doc.: IEEE 11-12/69r2
• Current length of BSS Max Idle Period is only ~18.64hrs (16bit with unit of 1000TU).
• Suppose AP supports longer max idle period (~days) with ultra low sleep power consumption,
• STA could sleep longer than 18hrs to save more power, without sending keep-alive frame every 18hrs.
• By keep association with AP, if emergency situation happens, STA can quickly wake up and report important data to AP.
• Besides, STA can response to event-based query/control message
from AP by periodically listen to TIM message.
Power Save for very long transmission duty cycle (~days)
Slide 6 ZTE Corporation
Submission
Jan 2012 doc.: IEEE 11-12/69r2
• One of the simply solution is to enlarge the unit of Max Idle Period, e.g. from ‘1000TU’ (1s)
to ‘10000TU’ (10s), so that the length of Max Idle Period will be extended from ~18.64hrs to
~186hrs (7.75days) .
Power Save for very long transmission duty cycle (~days)
Slide 7 ZTE Corporation
Idle Options:
ZTE Corporation
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Summary
• Multiple Max Idle Period management extension for Support both mobile devices and sensors
• Very long Max Idle Period management extension (~days) for support related 11ah use cases
• One of the simply solution is to change the unit of Max Idle Period, so that the length of Max Idle Period will be extended longer than ~18hrs.
ZTE CorporationSlide 8
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Reference
[1] 11-11-0457-00-00ah-potential-compromise-of-802-11ah-use-case-document
[2] 802.11v-2011
[3] 11-11-0985-01-00ah-performance-evaluation-of-multiple-STAs’-authentication-and-association-process
[4]11-11-1204-00-00ah-power-saving-mechanism-consideration-for-802.11ah-framework
[5] 11-11-0060-01-00ah-low-power-capability-support-for-802-11ah
ZTE CorporationSlide 9
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Straw Poll 1
Do you support the concept of Multiple Max Idle Period management extension for Support both mobile devices and sensors？
Y:
N:
A:
Slide 10 Minyoung Park, Intel Corp.ZTE CorporationSlide 10
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Straw Poll 2
Do you support the concept of very long Max Idle Period (~days) extension for better support related 11ah use cases?
Y:
N:
A:
Slide 11 Minyoung Park, Intel Corp.ZTE CorporationSlide 11
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Straw Poll 3
Do you support the concept of very long Max Idle Period (~days) by simply change the unit of Max Idle Period, so that the length of Max Idle Period will be extended longer than ~18hrs?
Y:
N:
A:
Slide 12 Minyoung Park, Intel Corp.ZTE CorporationSlide 12
Submission
Jan 2012 doc.: IEEE 11-12/69r2
backup
ZTE CorporationSlide 13
Submission
Jan 2012 doc.: IEEE 11-12/69r2
Power Save for very long transmission duty cycle (~days)
• If the sensor is disassociated with AP until requirement of burst data transmission
To meet the requirement,
• successful and faster association process is needed to satisfy the delay requirement and security requirement for these time-sensitive and life/property-related important data transmission, especially for burst data transmission by large number of STAs at the same time due to emergency event happens such as fire disaster.[3]
• AP also needs to check the status of sensor or query sensor occasionally. How disassociated-STA quickly responses to this event-based query/control message from AP ?
Num of STAs
Authentication and association time (s)
50 1.2073
100 1.8012
200 2.6550
500 4.6366
900 11.2495
1000 12.345
1500 82.9897
2000 152.024
2500 238.603
3000 323.556
ZTE CorporationSlide 14
