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Comparing Beacon Transmission Approaches for Minimizing Power Consumption in WPANs

This document compares power consumption in two proposed beacon transmission approaches for Wireless Personal Area Networks (WPANs). It analyzes energy consumed for beacon transmissions, durations, power values, and energy consumption calculations to assess the efficiency of transmission methods. The comparison reveals that the BP approach significantly reduces power consumption compared to the Non-BP approach, making it more energy-efficient for sleeping devices in WPANs.

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Comparing Beacon Transmission Approaches for Minimizing Power Consumption in WPANs

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Power consumption] Date Submitted: [8 March, 2006] Source: [Sebastian Max, Chun-Ting Chou] Company [Philips] Address [Kopernikusstr. 16, 52074 Aachen, Federal Republic of Germany] Voice:[+49-241-80-25-82-9], FAX: [+49-241-80-22-24-2], E-Mail:[smx@ieee.org] Re: [] Abstract: [This document compares the power that is consumed in the two proposed different beacon transmission approaches] Purpose: [To aid discussion.] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. S. Max, Chun-Ting Chou

  2. Power consumption Sebastian Max Chun-Ting Chou Philips Research Laboratories & Chair of Communication Networks, RWTH Aachen S. Max, Chun-Ting Chou

  3. Non-BP approach • Consumed Energy for N beacons • N (Ewakeup + EGuard + ESIFS + EBeacon) S. Max, Chun-Ting Chou

  4. BP approach • Consumed Energy for N beacons • Ewakeup +N (EGuard + ESIFS + EBeacon +EIdle) S. Max, Chun-Ting Chou

  5. Durations • twakeup = 5ms • tguard = 13.1072 µs • IEEE 802.15.3, 8.4.3.6 Guard Time • ClockAccuracy = 0.25ppm (See 11.5.5) • SFmax = 256*256µs • MaxDrift = [Clock accuracy (ppm) / 1e6] * interval (SFmax) • MaxLostBeacons = 3 • GuardTime = [MaxLostBeacons*2 + 2] * MaxDrift • tSIFS = 10 µs • tBeacon = ¾ * 256µs = 192µs • tIdle = ¼ * 256µs = 64µs S. Max, Chun-Ting Chou

  6. Power consumation • Values from [1] • Pwakeup = n.a. • PGuard = PSIFS = PIdle = 290mW • PBeacon = PRx = 290mW • neglecting the one beacon Tx S. Max, Chun-Ting Chou

  7. Energy Consumation • Values from [1] • Ewakeup = 0.3248 mWs • (see backup for calculation) • EGuard = PGuard * tguard = 0.0038 mWs • ESIFS = PSIFS * tSIFS = 0.0029 mWs • EIdle = PIdle * tIdle = 0.01856 mWs • EBeacon = PBeacon * tBeacon = 0.05568 mWs S. Max, Chun-Ting Chou

  8. Comparison • Non-BP approach • ETotal = 0.38718mWs * N • Assuming N = 10  3.8718 mWs • BP approach • ETotal = 0.3248 mWs + 0.08094mWs * N • Assuming N = 10  1.1342 mWs • A sleeping device needs with the Non-BP approach more than 3x the power S. Max, Chun-Ting Chou

  9. References • [1] Prism Power Management Modes, Carl Andren, Tim Bozych, Bob Rood and Dough Schultz, Feb. 1997, available at http://www.cnds.jhu.edu/research/networks/archipelago/prism_power_management_modes.pdf S. Max, Chun-Ting Chou

  10. Backup S. Max, Chun-Ting Chou

  11. Energy consumption during wakeup • Wake-up time flow can be found in [1] S. Max, Chun-Ting Chou

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