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TGah Use Case: AP Power Saving in Smart Grid. Date: February 28 , 20 1 1. Authors:. 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
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TGah Use Case:AP Power Saving in Smart Grid Date: February 28, 2011 Authors:
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)
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
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
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
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
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