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Consideration on Max Idle Period Extension for 802.11ah Power Save

Learn about extending Max Idle Period to support long transmission duty cycles, with considerations for mobile devices and sensors in use cases like smart grids. Explore solutions and benefits of managing Max Idle Period effectively.

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Consideration on Max Idle Period Extension for 802.11ah Power Save

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  1. ZTE Corporation Consideration on Max Idle Period Extension for 802.11ah Power Save • Date: 2012-01-19 Authors:

  2. ZTE Corporation Abstract • The target of this presentation is to provide some considerations on Max Idle Period extension for 802.11ah power save.

  3. ZTE Corporation Transmission Characteristics of 11ah Use Case [1]

  4. ZTE Corporation Motivation • 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. • 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)

  5. ZTE Corporation 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. • To save power of sensors in these use cases, AP should support multiple max idle period management scheme

  6. ZTE Corporation Power Save for very long transmission duty cycle (~days) • 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 APby periodically listen to TIM message.

  7. ZTE Corporation Power Save for very long transmission duty cycle (~days) • 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) . Idle Options: ZTE Corporation

  8. ZTE Corporation 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.

  9. ZTE Corporation 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

  10. ZTE Corporation 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.

  11. ZTE Corporation 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.

  12. ZTE Corporation 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.

  13. ZTE Corporation backup

  14. ZTE Corporation 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 ?

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