Power Saving Methods in EPON

Power Saving Methods in EPON

Power Saving Methods in EPON

IEEE P1904.1 SIEPON Seminar, Prague, Czech 1April 20, 2012

Susumu Nishihara, NTT Corporation

ContributorsContributors

Hesham Elbakoury, Huawei TechnologiesMarek Hajduczenia, ZTE Corporation Ryan Hirth, Broadcom CorporationManabu Kato, PMC-SierraMitsunobu Kimura, Hitachi Ltd Hiroaki Mukai, Mitsubishi Electric Corporation

2IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012

OutlineOutline

Need for power saving in fiber access Power consumption of optical access network Social requirement and regional guidelines

Power-saving mechanisms in EPON Requirement Mechanisms

Performance of power-saving mechanisms Calculation model Power-saving effectiveness

April 20, 2012 IEEE P1904.1 SIEPON Seminar, Prague, Czech3

Power consumption of fiber accessPower consumption of fiber access

2.37 TWh annually (60-million ONUs in globe)– Corresponds to power consumption by 300-thousand US households

Majority of power consumption in fiber access: ONU To total power consumption of whole network system*:– ONUs: 60 %– OLTs: 7 %

April 20, 2012 IEEE P1904.1 SIEPON Seminar, Prague, Czech4

UNISNI

PONAccess NW

(60 ％)

(7 ％)(14 ％)

(19 ％)L2SW

OLTONU

ONUUNI

(81 ％)Core/Metro NW

*http://www.ieee802.org/3/av/public/2008_09/3av_0809_otaka_1.pdf

Regional guidelinesRegional guidelines

Specified to serve as:– Procurement guideline for operators– Target power-efficiency of equipment with test

methodologies

For example.. China

– Technical requirements and test methods for energy saving of access network equipment EPON system

Europe– Code of Conduct on Energy Consumption of Broadband

Equipment

Japan– Ecology Guideline for the ICT Industry


Target power: GE-PON ONUTarget power: GE-PON ONU

JapanFigure of merit: P = average energy consumption (W)

Assessment scale P (W), 100Mbps UNI P (W), 1Gbps UNI

E 2.576 E 3.115

2.576 < E 2.944 3.115 < E 3.56

2.944 < E 3.312 3.56 < E 4.005

3.312 < E 3.68 4.005 < E 4.45

E > 3.68 E > 4.45

EuroIdle-State: no trafficOn-State: 20 Mbit/s downstream, 5 Mbit/s upstream

DeviceTier 2011-2012:1.1.2011- 31.12.2012

Tier 2013-2014:1.1.2013 - 31.12.2014

Idle-State (W) On-State (W) Idle-State (W) On-State (W)

GE-PON ONU, Gigabit Ethernet UNI 2.7 4.0 2.3 3.5


Target power: GE-PON ONUTarget power: GE-PON ONU

JapanFigure of merit: P = average energy consumption (W)

Assessment scale P (W), 100Mbps UNI P (W), 1Gbps UNI

E 2.576 E 3.115

2.576 < E 2.944 3.115 < E 3.56

2.944 < E 3.312 3.56 < E 4.005

3.312 < E 3.68 4.005 < E 4.45

E > 3.68 E > 4.45Must be achieved by

the end of FY2012

EuroIdle-State: no trafficOn-State: 20 Mbit/s downstream, 5 Mbit/s upstream

DeviceTier 2011-2012:1.1.2011- 31.12.2012

Tier 2013-2014:1.1.2013 - 31.12.2014

Idle-State (W) On-State (W) Idle-State (W) On-State (W)

GE-PON ONU, Gigabit Ethernet UNI 2.7 4.0 2.3 3.5


Overview of power-saving techniquesOverview of power-saving techniques

8

HGW ONUONU-CI

Device approaches:・ Power saving of components themselves

Power gatingClock gatingProcess shrinkage of semiconductor devices

・Energy Efficient Ethernet (IEEE 802.3az)

PC

IPTV

VoIP

Information in-home appliances

IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012

Overview of power-saving techniquesOverview of power-saving techniques

9

HGW ONUONU-CI

Device approaches:・ Power saving of components themselves

Power gatingClock gatingProcess shrinkage of semiconductor devices

・Energy Efficient Ethernet (IEEE 802.3az)

PC

IPTV

VoIP

Information in-home appliances

Network approach:ONU sleep


RequirementsRequirements

10

Reduce ONU power consumption– Without affecting user experience

• IP telephony• IPTV• VoD• etc.

– Without negative impact such as:• Deregistration from OLT due to too-long sleep duration

» MPCP timeout» Clock frequency deviation between ONU and OLT

– With secured compatibilities with legacy equipment• Coexistence between OLT and..

» ONUs supporting power-saving mechanisms» ONUs not supporting power-saving mechanisms


11

Overview of ONU sleep techniqueOverview of ONU sleep technique

• Components powered down:• Tx mode: Transmitter• TRx mode: Transmitter and receiver

Time

Active

Sleep

No traffic observed Traffic observed

Active

Sleep

Periodic wake-up

e.g. 100 msec


Basic mechanisms ~OLT-driven~Basic mechanisms ~OLT-driven~


ONU OLTSleep_Allowed

Sleep

Active

Sleep

Active

Sleep Wake-up

Single cycle

Multiple cycles

ONU OLTSleep_Allowed

(Tx / TRx)

Sleep

Basic mechanisms ~OLT and ONU interactions~Basic mechanisms ~OLT and ONU interactions~


ONU OLT

Sleep_Allow

Sleep

Active

Sleep

Active

SleepWake-up

Sleep_Ack(Tx /TRx / Wake-up)

– Power down mode:• Tx mode, consumes 0.7 W• TRx mode, consumes 0 W• Power consumption in active mode: 2.1 W

– Bit rate 10 Gbit/s– Active duration 6 msec– Delay 10 msec

Power-saving performance ~10G case~Power-saving performance ~10G case~


pdpdactslpact

dlyactps PPP

tttt

P

)(

Ppd

Pact

tact

tdly

tslp

tdly

Power-saving performancePower-saving performance

15

0

100

200

300

400

500

600

700

800

0

0.5

1

1.5

2

2.5

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Red

uctio

n o

f CO

2em

ission (kto

n)T

Rx

pow

er c

onsu

mption (

W)

Sleep cycle duration (sec)

• Effective sleep duration: Over tens of msec • Sleep duration: Must be carefully designed


Power, Tx modePower, TRx modeCO2, Tx modeCO2, TRx mode

SummarySummary

Demands for power-efficient ONU– Large number of distribution– Social requirement around the world

Power-saving mechanisms in EPON– Without affecting on user experience– With guaranteed connectivity between OLT and..

• ONUs supporting power-saving mechanisms• ONUs not-supporting power-saving mechanisms

ONU power-saving performance– Effective with long sleep duration

• Sleep duration must carefully be designed



Supplementary Slides


Regional guideline ~ Europe ~ 1/2Regional guideline ~ Europe ~ 1/2


Regional guideline ~ Europe ~ 2/2Regional guideline ~ Europe ~ 2/2


Regional guideline ~ Japan ~Regional guideline ~ Japan ~



*http://www.ieee802.org/3/av/public/2008_09/3av_0809_otaka_1.pdf

Technology

Power Saving Methods in EPON