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NDP Probing

NDP Probing. Authors:. Date: 2012-07-12. Authors:. Authors:. Motivation. How much power does STA consume during the scanning? In US [1], the numbers of 1MHz are 26 Total Energy Consumption = {(1360us*TX Power)+(550us*RX Power)}*26 = {(1360us*500mW)+(550us*250mW)}*26

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NDP Probing

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  1. NDP Probing Authors: Date: 2012-07-12 YonghoSeok, LG Electronics

  2. Authors:

  3. Authors: Yongho Seok, LG Electronics

  4. Motivation • How much power does STA consume during the scanning? • In US [1], the numbers of 1MHz are 26 • Total Energy Consumption = {(1360us*TX Power)+(550us*RX Power)}*26 • = {(1360us*500mW)+(550us*250mW)}*26 • = (0.68+0.1375)*26 = 21.255 mWxSec Yongho Seok, LG Electronics

  5. Motivation • How much power does STA consume during the scanning? Yongho Seok, LG Electronics

  6. Motivation • Standby time of the current smart phone having 1,500mAh battery is almost 350 hour. • The average energy consumption per minute is 0.266mWh. • It assumes turning off Wi-Fi. • What does Wi-Fi impact on the standby time ? • The Wi-Fi scanning frequency in the android OS is once per 20 second. • The Wi-Fi energy consumption per minute is 0.025mWh (30.7mWs*3/3600). • Wi-Fi is occupying about 9.3% compared with all components of the smart phone (e.g., Display, CPU and 3G modem). • Just by turning on Wi-Fi, standby time of the smart phone can be reduced from 350 hour to 320 hour. • So, reducing the energy consumption of scanning is valuable work. Yongho Seok, LG Electronics

  7. Proposed NDP Probing Procedure • NDP Probing Procedure • STA transmit NDP Probe Request frame. • SIG field may contain Access Network Option, Partial SSID. • SIG field may contain Probe Response/Short Beacon Indication as the response frame of NDP Probe Request frame. • AP responses Probe Response/Short Beacon frame after back-off. • Probe Response/Short Beacon frame is broadcasted. Yongho Seok, LG Electronics

  8. Proposed NDP Probing Procedure • NDP Probing Procedure • PHY-CCA.indication (busy) primitive has not been detected before the ProbeTimer reaches MinChannelTime, then set NAV to 0 and scan the next channel. [IEEE 802.11-2012] • After receiving Short Beacon/Probe Response frame, STA may transmit Probe Request frame/Association Request frame or listen to full Beacon frame for obtaining the more information. Yongho Seok, LG Electronics

  9. Performance Evaluation • Case 1 : Any BSS is not operating Yongho Seok, LG Electronics

  10. Performance Evaluation • Case 2 : At least one BSS is operating on some 1MHz channel Yongho Seok, LG Electronics

  11. Performance Evaluation • Case 2 : At least one BSS is operating on some 1MHz channel • X-axis is the number of the busy channel s where at least one BSS is operating • Y-axis is the total energy consumption (mWxSec) • Left figure assume that one busy channel has only one BSS • STA receives only one Probe Response frame after transmitting Probe Request frame Gain mWxSec Number of busy channels Yongho Seok, LG Electronics

  12. Conclusion • The energy consumption during the scanning is significantly high. • Especially, when the AP is not existing, the unnecessary scan is a problem. • To solve this problem, we proposed NDP Probing Procedure. • In the proposed NDP Probing Procedure, STA transmits NDP Probe Request frame and receives a Probe Response/Short Beacon frame. • The contents of SIG field is TBD. Yongho Seok, LG Electronics

  13. Straw Poll 1 • Do you support to define a NDP Probe Request frame with the following format? STF LTF1 SIG Yongho Seok, LG Electronics

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