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TGah Use Case: AP Power Saving in Smart Grid

This use case proposes AP power saving features in IEEE 802.11ah to reduce energy costs and unnecessary CO2 emissions in wireless Smart Grid applications. It focuses on idle periods, such as night time, with less meter data transmission.

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TGah Use Case: AP Power Saving in Smart Grid

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  1. TGah Use Case:AP Power Saving in Smart Grid Date: February 28, 2011 Authors:

  2. Objective • Proposed AP power saving use case in Smart Grid for IEEE 802.11ah TG • Submission supports DCN 11/46r2 “AP Power Saving” by adding a use case scenario description • AP power saving features are highly attractive for wireless Smart Grid applications to increase customer acceptance and to reduce CO2 emissions (Green Grid)

  3. Motivation • IEEE 802.11ah MAC should provide energy saving functions so that it can be deployed in Smart Grid as a communication infrastructure that • Reduces energy costs • Reduces unnecessary CO2 emissions that may occur during idle periods • Idle times • Night time with less/no meter data • Different meter strategies (gas, water, power) cause different idle times • Periodic monitoring and transmission of meter data, e.g., every 30 min. [3] • Idle time is an excellent candidate for power saving • Between meter data transmissions 11ah AP/STAs may change the state from active to sleep to reduce energy consumption and CO2 emissions • 11ah STAs may change to sleep mode (not part of this submission, see [4]) • 11ah APs may change to sleep mode (part of this submission, see [5]) Slide 3

  4. Use Case: AP Power Saving in Smart Grid Transmission of meter data Idle period, e.g., night time 11ah STAs 11ah STA(*)Meter/sensor active active active t day night day night day Request: AP sleep Response Sleep duration AP sleep state 11ah AP 11ah AP(**) sleep sleep t day night day night day IEEE 802.11ah network (*) = IEEE 802.11ah STA with proposed AP power saving support (**) = IEEE 802.11ah AP with proposed AP power saving support Slide 4

  5. Use Case Scenario Description: AP Power Saving in Smart Grid • During communication idle periods in Smart Grid • 11ah AP: Request • AP wants to change from active to sleep mode • 11ah STA: Response • STA state support: AP active/AP light sleep/AP deep sleep • STAs high priority messages supported during light sleep mode • Proposed 11ah AP modes (similar to IEEE 802.11s) [6] • active mode: A link specific power mode in which the AP operates in the Awake state. • light sleep mode: A link specific power mode in which the AP operates in the Awake or the Doze state and where the AP is expected to receive frames from the STA. • deep sleep mode: A link specific power mode in which the AP operates in the Doze state and where the AP is not expected to receive frames from the STA. • E.g., utilizing IEEE 802.11v features [7] Slide 5

  6. References [1] IEEE P802.11 Wireless LANs, IEEE 802.11ah Call for proposals, IEEE 802.11-10/1373r0, 11.11.2010 [2] IEEE P802.11 Wireless LANs, Proposed IEEE 802.11ah Use Cases, IEEE 802.11-11/0017r5 [3] Smart Meter Service Information (Japanese), October 4, 2010 [4] IEEE P802.11 Wireless LANs, BSS Max Idle Period and Sleep Interval, IEEE 802.11-10/1326r0, 11.8.2010 [5] IEEE P802.11 Wireless LANs, AP Power Saving, IEEE 802.11-11/46r2, 15.1.2011 [6] IEEE 802.11s(TM)/D7.0, 2010 [7] IEEE 802.11v(TM)/D16.0, 2010

  7. Acknowledgement This contribution was funded in part by a grant from the Promotion program for Reducing global Environmental loaD through ICT innovation (PREDICT) led by the Ministry of Internal Affairs and Communications, Japan. Slide 7

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