Consideration of tgah power saving for functional requirement

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Presentation transcript:

Consideration of tgah power saving for functional requirement April 2011 doc.: IEEE 802.11-11/0547r0 May 2011 Consideration of tgah power saving for functional requirement Date: 2011-05-05 Authors: Slide 1 ZTE Corporation. Mitsuru Iwaoka, Yokogawa Elec. Co.

Abstract This presentation proposes some considerations on power April 2011 doc.: IEEE 802.11-11/0547r0 May 2011 Abstract This presentation proposes some considerations on power saving functional requirement related to use case category 1. Slide 2 ZTE Corporation. Mitsuru Iwaoka, Yokogawa Elec. Co.

May 2011 Use Case Category 1 1a: 11/17r5, slide 7 Smart Grid - Meter to Pole 1c: 11/253, Environmental/Agricultural Monitoring 1d: 11/260r1, slid 4 Industrial process sensors 1e: 11/17r5, slid 17 Healthcare 1f: 11/241r0, slide 3 Healthcare 1g: 11/241r0, slid 5 Home/Building Automation 1h: 11/242r0, slid 2 Home sensors Slide 3 ZTE Corporation.

Battery life example for Sensor May 2011 Battery life example for Sensor An traditional sensor controller with 1200mAh battery (real case!) Working cycle: 10s sleeping slot with 10ms working slot; 3uA for sleeping while 40mA for working; Power consumption: Working part: 0.01/10h*40mA=0.04mAh; Sleeping part: (1-0.01/10)h*0.003mA=0.002997mAh Cycle life: 1200/(0.04+0.002997)=27908h=1162day=3.18Y What is the Cycle life result if working slot to be 20ms? 1200/(0.08+0.002994) = 14459h= 602day = 1.65Y Nearly half of original value! So power saving features is very important to be described in the functional requirement for sensor use cases. Slide 4 ZTE Corporation.

May 2011 Some considerations on power saving functional requirement of Use Case Category 1 Well, from previous example, duty cycle needs to be considered to be key requirements for 802.11ah enabled sensors, Channel access model/mechanism should also be carefully evaluated when we have thousands of sensors connected with one AP, what a busy channel! Network management should be considered too as sensor also needs contention window to communicate with AP; Battery life will be an important requirement for sensor scenarios also, while its value varies in large range given the different use cases. Suggest further investigation on sensor power consumption values. Slide 5 ZTE Corporation.

April 2011 doc.: IEEE 802.11-11/0547r0 May 2011 References [1] Potential Compromise for 802.11ah Use Case Document, IEEE802.11-11/0457r0 [2] Discussion for 11ah Functional Requirements , IEEE802.11-11/0528r0 Slide 6 ZTE Corporation. Mitsuru Iwaoka, Yokogawa Elec. Co.