Project: IEEE P802.15 Working Group for Wireless Personal Area - - PowerPoint PPT Presentation

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 1 Submission SAIT/SEM

Project: IEEE P802.15 Working Group for Wireless Personal Area N Project: IEEE P802.15 Working Group for Wireless Personal Area Networks ( etworks (WPANs WPANs) )

Submission Title: Wake-up Radio Presentation for IEEE TG4a PHY Date Submitted: May 2005 Source: (1) Young-Hwan Kim, Jae-Hyon Kim, Seong-Soo Lee (2) Haksun Kim, Tahjoon Park, Eungju Kim, Changsoo Yang, Kyeongli Kim, Kwangdu Kim Company: (1) Samsung Electronics Co., Ltd. (Samsung Advanced Institute of Technology (SAIT)) (2) Samsung Electro-Mechanics Co., Ltd. (SEM) Address: (1) San 14-1, Nongseo-ri, Giheung-eup, Yongin-si, Gyeonggi-do, Korea 449-712 (2) 314, Maetan-3Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, Korea 443-743 Voice: [+82-31-280-9663], FAX: [+82-31-280-9555], E-Mail: [ jae.kim@samsung.com] Re: [Response to IEEE 802.15.4a Call for Proposals (04/380r2)] Abstract: [Proposal for the IEEE 802.15.4a PHY standard based on wake-up radio system technology.] Purpose: [Proposal for the IEEE 802.15.4a PHY standard.] 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.

doc.: May 2005

Slide 2 Submission SAIT/SEM

Wake-up Radio Presentation for IEEE 802.15.4a PHY

Presented by: Jae-Hyon Kim Samsung Advanced Institute of Technology (SAIT) Samsung Electro-Mechanics (SEM)

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 3 Submission SAIT/SEM

Objective

• Propose inclusion of wake-up radio to provide ability
• f controlling wake-up and to reduce power

consumption – Ultra-low Power Receiver

Requirements

Power Consumption (TG4a Technical Requirement)

• The device (complete communication system including alt-PHY and MAC) must operate

while supporting a battery life of months or years without intervention.

• Therefore very efficient power saving modes are desirable, in particular for devices that

transmit sporadically. In addition the coordination of nodes must not induce frequent wake up

• f nodes. These mechanisms must be supported by the alt-PHY layer.

Power Management Modes (TG4a Selection Criteria)

• The ability to reduce power consumption for devices compliant with this standard is

important.

• Definition: Power management modes and protocols allow device sleep, wakeup, and poll.

The IEEE 802.15.4 standard provides such power management capabilities.

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 4 Submission SAIT/SEM

Preamble

#1 Receiver #2 Receiver

ID Data Preamble ID

Carrier Sensing Wake-up

Receive Data

Carrier Sensing ID Sensing #N Receiver Carrier Sensing Transmitter Carrier Sensing Carrier Sensing Carrier Sensing ID Sensing discarded ID Sensing discarded

Wake-up: Procedure

All zeros to bypass

• r a code to wake up

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 5 Submission SAIT/SEM

Wake-up: ID

To provide wake-up ability it requires to include wake-up ID in the header

802.15.4 PPDU

Preamble SFD PHR PSDU

4 + 1 + 1 Bytes 32 Bytes

Proposed PPDU

Preamble SFD PHR PSDU

4 + 2 + 1 + 1 Bytes 0 ~ 127Bytes

WU-ID WU-ID: Wake-up ID WU-ID can be all 0 sequence (to bypass) or a code (to wake-up)

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 6 Submission SAIT/SEM

Power

Wake-up: Radio Structure

Wake Up Signal

Carrier Sensing Signal Detector Super-regenerative OSC LNA Correlator High Gain Amplifier Detector Wake-up Signal Switch

Carrier Signal Detector Wake-up Signal Detector

Main Transceiver

• Wake-up radio detects broadcast wake-up carrier signal and activates wake-up signal

detector for wake-up signal detection

• Conserves power by only turning on wake-up signal detector when it is needed; carrier

detector consumes little power on its own compared to wake-up signal detector

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 7 Submission SAIT/SEM

Wake-up: Signal Flow of Radio

Signal Carrier Signal Detector ON Carrier Signal ? Wake-up Signal Detector ON & Carrier Signal Detector OFF Wake-up Signal ? Main Data Radio ON Wake-up Signal Detector OFF Data Communication YES YES No No

doc.: May 2005

Slide 8 Submission SAIT/SEM

Back-up Slide

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 9 Submission SAIT/SEM

Wake-up Signal Detector ON

• Super-regenerative receiver has essentially infinite gain and high output level.
• The principle of super-regeneration allows a very simple architecture and appears to be

particularly suited to micro-power applications, compared to the super-heterodyne, the low IF or the direct conversion receiver. Super-regenerative OSC Comparator Low-Pass Filter Envelope Detector

A

β Σ

Quench RF IN

Wake-up: Carrier Signal Detector

Super-regenerative OSC

• Possible low power operation
• Allows Possible radio operation above device fT
• Allows low bias current levels
• Minimal number of active devices
• A very simple architecture
• Very good sensitivity

– Due to High RF gain – Allows reduction in transmit power

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 10 Submission SAIT/SEM

Wake-up: Signal Detector

LNA Correlator (Matched Filter) High Gain Amplifier Envelope Detector Low Pass Filter Identification Detector

RF IN Wake-up Signal

Tc

• Simple architecture and low power operation

– Does not require many high-frequency active components such as Mixer, PLL, OSC.

• The signal is reinforced by the correlator (matched filter) while the disturbances

contribute only as basic noise (system gain). Therefore, wake-up signal detector is very resistant against narrowband noise and interferer.

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 11 Submission SAIT/SEM

Wake-up: Characteristics of Signal

1 0 111 0 1 … Barker Code/BPSK OOK

Data 1 0 1 1 0 Transmitter Correlator (Matched Filter) Demodulated wake-up signal

• The signal is modulated by OOK.
• It has less complexity.
• Each symbol is modulated by

BPSK and is coded by barker code.

• It has very resistance against

narrowband noise and interferer.

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 12 Submission SAIT/SEM

Chaotic Source ( 1 )

• Colpitts Oscillator

a1 vo mimcap_shield_TT X 10

R R21 nmos_rf_TT TT spiral_s2_std_TT X 6 mimcap_shield_TT X 7

mimcap_shield_TT X 9

R R22 R R23 R R20 R=50 chotic_Filter2 X 11 V_DC SRC6 Vdc=Vc R L21 R=200 Ohm

CMOS I C ( On Chip) BPF ( Off Chip)

TSMC 0 .1 8 um CMOS Process Pow er Consum ption:1 .8 m W ( 1 m A, 1 .8 V)

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 13 Submission SAIT/SEM

Chaotic Source ( 2 )

0.16 0.18 0.20 0.22 0.24 0.26 0.14 0.28 0.6 0.8 1.0 1.2 0.4 1.4

Source_v Drain_V

5 10 15 20 25 30

• 180
• 160
• 140
• 120
• 100
• 80
• 200
• 60

freq, GHz dBm(fs(vo))

200 300 400 500 100 600

• 400
• 200

200 400

• 600

600

time, nsec vo, uV

• Simulation Results

.State trajectory

May 2005 doc.: IEEE 15-05-0316-00-004a

Slide 14 Submission SAIT/SEM

Layout of Chaotic Source

3 0 0 um 4 0 0 um

• Colpitts Oscillator