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The EARTHEnergy Efficiency Evaluation Framework (E3F):
Copyright © 2008 EARTH – Energy Aware Radio neTwork techHnologies. All Rights reserved. 1Copyright © 2012 EARTH – Energy Aware Radio neTwork tecHnologies. All Rights reserved.
A methodology to evaluate radio network energy efficiency at system level
1st ETSI TC EE workshop20-21 June, 2012, Genoa, Italy
Magnus Olsson, Ericsson AB, Stockholm, SwedenTechnical Manager, EARTH [email protected]
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Acknowledgements
This presentation is based on material from the following paper:
“How much energy is needed to run a wireless network?”
by G. Auer (DOCOMO Eurolabs), V. Giannini and C. Desset (IMEC),
I. Godor, P.Skillermark and M. Olsson (Ericsson), M. Imran (University of
Surrey), D. Sabella (Telecom Italia), M. Gonzalez (TTI), O. Blume (Alcatel-
Lucent), and A. Fehske (TU Dresden)
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EARTH PROJECT2012
Lucent), and A. Fehske (TU Dresden)
published in IEEE Wireless Communications Magazine, October 2011
The research in the EARTH project has received funding from the European
Community’s Seventh Framework Program [FP7 / 2007-2013] under grant
agreement n ͦ 247733.
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Background and motivation
• What is EARTH?
– EU-funded project with 15 partners from industry and academia
– Started in January 2010, will end in June 2012
– Jointly led by Alcatel-Lucent (PC) and Ericsson (TM)
• EARTH has an ambitious overall goal to decrease the radio access network
(RAN) energy consumption by 50%
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(RAN) energy consumption by 50%
– More efficient hardware components, RRM mechanisms, network
management solutions, deployment strategies, etc.
• Evaluation methodology for energy consumption
– The EARTH Energy Efficiency Evaluation Framework (E3F)
– Primarily focused on a given system, with and without feature(s)
– Captures network dynamics and behaviour
– Fully compatible with existing 3GPP and ITU-R evaluation methodology
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EARTH Energy Efficiency Evaluation
Framework (E3F)
Aggregation to Global ScaleReference System & Scenarios
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E3F
Power Model MetricsC
ell-
edge r
ate
Aggregation to Global ScaleReference System & Scenarios
Base
Station
PinPout
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Reference system and scenarios
Basis for traditional
(small-scale, short-term)
System Level
SimulationsReference System & Scenarios
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E3F• Define system parameters and scenarios so to ensure
comparable results
• Dynamic system simulation for different deployments
o Dense urban, urban, suburban and rural
• 3GPP and ITU-R compliant evaluation methods
Reference System & Scenarios
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Base station (BS) power model
Realistic Power Model MS
1500MacroCell - 46dBm Max
BS
Po
wer
Co
nsu
mp
tio
n [
W]
MS
150MicroCell - 38dBm Max
BS
Po
wer
Co
nsu
mp
tio
n [
W]
• Maps RF output power Pout to the total BS supply power Pin
• Power breakdown of different components for various BS
types (macro, micro, pico, femto BS)
→ Includes power amplifier (PA), RF, base band (BB)
processing, DC-DC unit, cooling, mains supply
• Power model contributed to 3GPP RAN1
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E3F
Power Model
Realistic Power Model
Base
Station
PinPout
PA
RF
BB
DC
CO
20 40 60 80 1000
500
1000
RF Output Power [%]
BS
Po
wer
Co
nsu
mp
tio
n [
W]
PA
RF
BB
DC
CO
20 40 60 80 1000
50
100
RF Output Power [%]
BS
Po
wer
Co
nsu
mp
tio
n [
W]
PA
RF
BB
DC
CO
MS
20 40 60 80 1000
5
10
15PicoCell - 21dBm Max
RF Output Power [%]
BS
Po
wer
Co
nsu
mp
tio
n [
W]
PA
RF
BB
DC
CO
MS
20 40 60 80 1000
2
4
6
8
10
12FemtoCell - 17dBm Max
RF Output Power [%]
BS
Po
wer
Co
nsu
mp
tio
n [
W]
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EARTH energy efficiency metrics
Performance Metrics
• [J/bit] – reflecting traditional capacity and data rate improvements
o Increasing peak data rates quickly decreases [J/bit]
• [W/m2] – reflecting crucial coverage and service area aspects
o High fixed cost for coverage makes [W/m2] very important
• Metrics communicated to ETSI TC EE
Recommended use of Energy Consumption Metrics
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E3FPerformance Metrics for Concept Evaluations
• Performance metrics follow
3GPP recommendations
[TR36.814]
• Served cell throughput
• Mean, 5th, 10th, and 50th
percentile user throughput
� Cell-edge throughput
MetricsC
ell-
edge r
ate
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Aggregation to global scale (1/2)
Country wide 24 hour
Traffic & Deployment
ModelAggregation to Global Scale
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E3FAggregation to Global Scale
• The EARTH daily traffic profile is extracted from operator data,
and represents an exemplary European country
• Based on network traffic data; geographical and population data
� Models average traffic aggregation to 24 hours
� Maps reference scenarios to country and European scale
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Aggregation to global scale (2/2)
Dense UrbanUrban
• Small-scale, short-
term system level
simulations provide
snapshots of the
respective
deployments
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• Aggregation to large-scale by weighted
summing
���� Based on Geographical data
determine deployment mix and
population densities
Suburban
Rural
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E3F – Summarizing flow chart
Metric
(short term, scenario specific)
Global Metric
(long term, large scale)
Large scale area &
Long term traffic load
EARTH Energy Efficiency
Evaluation Framework (E3F)
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Small-scale,
short-term
system level
evaluations
BS
channel
system
performance
mobile
Aggregation to global scale:- 24 hrs traffic model weights load
levels
- Country scale deployment model
weights simulation scenarios power
modelPout
Pin
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Case study: Energy efficiency of LTE
Objective:
• Assess the energy efficiency of a typical LTE network, for a typical operator, in a typical European country
Purpose:
• Situation analysis, identify improvement areas
Short-term, small-scale evaluations:
• Macro-cellular network with regular hexagonal cell layout is implemented→ 19 sites, each with 3 sectors
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→ 19 sites, each with 3 sectors
• Inter-site distance (ISD)
– Dense urban and urban environments: 500 m
– Suburban and rural areas: 1732 m
• The users are uniformly distributed, with user densities corresponding to the respective deployment scenarios
• The simulation parameters are taken from 3GPP reports [TR36.814], [TR25.814]
– 10 MHz bandwidth
– 2.1 GHz carrier frequency
– 2x2 MIMO transmission with adaptive rank adaptation
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Power Consumption per Unit Area (P/A)
• Only a modest dependency
of the system throughput on
the network power
consumption
� Due to macro BS power
model, which exhibits poor
efficiency at low loads
Short-term, small-scale evaluations
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• Urban scenario achieves more than 10 times higher system
throughput than suburban/rural scenarios � due to higher site
density (urban ISD=500m, compared to suburban/rural ISD=1732m)
• However, suburban/rural scenarios consume more than 10 times less
power
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Power Consumption per Unit Area (P/A)
Short-term, small-scale evaluations
• Only a modest dependency
of the system throughput on
the network power
consumption
� Due to macro BS power
model, which exhibits poor
efficiency at low loads
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• Aggregation to global scale:
o average power per area unit is 0.6 kW/km2, independent of
data usage scenario
o System operates at very low loads: on average less than 10 % of
resources are utilized, even for the high data usage scenario
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Summary
• The EARTH Energy Efficiency Evaluation Framework (E3F)
facilitates a holistic performance analysis at network level,
comprising:
– Realistic base station power model for various BS types
– Long-term traffic model & large-scale deployment model that
facilitate aggregation to global scale
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facilitate aggregation to global scale
– Energy efficiency metrics that complement existing performance
metrics
• Energy consumption of a LTE Rel-8 cellular network evaluated,
fundamental energy saving challenges identified:
� Vast potential at low traffic loads
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Thank you ☺
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Thank you ☺
http://www.ict-earth.eu