How to reduce Telecom CO2 while traffic is avalanching?

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How to reduce Telecom CO2 while
traffic is avalanching?
Case Study – Mature EU Country 2010-2020
Rev A
Tomas Edler
Senior Expert Energy Efficiency
Huawei Technologies Sweden
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Abstract
As telecommunication is evolving from basic voice and text services to data, media
and entertainment, the WW and European CO2 targets are at risk. The energy
consumption of ICT industry is already twice of air traffic energy consumption.
Historically, telecom energy efficiency has improved substantially, but how long
can we mitigate expected traffic avalanche? Based on best projections of traffic
and usage trends and best solutions for capacity and efficiency, I will show results
from a study on How we can reduce energy consumption of wireless networks
while supporting traffic growth. The results are compared to other studies.
HUAWEI
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Content
 Traffic Growth
 Scope of study
 What is unique
 Country emulation
 Traffic variations over cells
 Traffic models used
 How to improve efficiency
– Technology Generations
– BS architecture
– Dynamic Power Management
– Modelling Hardware Efficiency
– Spectrum & HW refarming
– Traffic load HW utilizaion
– Energy saving features
 RAN results
 Other studies
 Conclusion
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Incredible Success of Wireless Communications
 Last 45 years: 1 Million Increase in Trafficz
Martin Cooper’s law
The number of simultaneous
voice/data connections has doubled
every 2.5 years (+32% per year)
since the beginning of wireless
Source: Personal Communications in 2025, Martin Cooper
Martin Cooper
Inventor of handheld cellular phones
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Source: Wikipedia
Traffic growth
 Mobile Data Growth Sweden:
90%/Y 2010-2012
 2010-2020 estimates:
 CISCO: +61%/Y, 117X 2013-2018
 METIS : 1000X
 Huawei study: 67/Y 2010-2020
 How Can We Sustain this Growth?
– Continuous network evolution
– More traffic for the same price
– Mitigate traffic growth with Energy Efficiency
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Predictions for the Future
 Rapid Network Traffic Growth
– 61% annual data traffic growth
– Faster than in the past!
– Exponential increase
– Extrapolation:
20x until 2020
200x until 2025
2000x until 2030
 How Can We Sustain this Growth?
– Continuous network evolution
– More traffic for the same price
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Operator’s Demand
Operator’s Demand


Cooperate with
Verizon, Qwest
organize ATIS
NIPP TEE
standard
Take energy
consumption as
key element


CO2 emission reduced by
80% @ 2020 (vs.1996)
HUAWEI
CO2 emission
reduced by 50% @
2020 (vs.2006)
Energy Consumption 
reduced 50%


Improve equipment EE by
30% energy saving -- CEO
Cesar Alierta
Total power, petrol, water
consumption
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
“Low energy is key
performance”, said by TI
CTO Stefano Pileri

Develop energy saving
plan for NGN2
Per-user power reduced
by 20% @ 2020 (vs.2006)
Introduction
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Scope of study
Holistic view, emulating field RAN evolution in central EU 2010-2020
 Sample EU ”countries”
 Evolution of traffic, subscribers, UE’s and RAN 2010-2020.
– Energy Consumption and Efficiency evolution
 Dense Urban/Urban/Suburban/Rural areas
 Deployment evolution 2G-4G, HW, SW and spectrum
 Total RAN aspects, i.e Base stations, site infrastructure (cooling, power, back-haul)
 HetNet in Dense Urban area.
 Energy Saving solutions ( HW/SW, BS, site, RAN)
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What is unique in this study
The holistic view including
 ”Non-Hype” realistic PS traffic growth,
67%/Y, 170X in period
 Traffic growth from a PS (Packet Switch) resource view
 Multi-RAT evolution 2-4G
 Spectrum refarming
 Higher utilization of RAN
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Country emulation
 A typical mature central EU country
 Analysis area 100.000 sqkm
100000,0
Subs/ SQkm
10000,0
1000,0
Subs/ SQkm
100,0
10,0
DU
DU
0,2%
ISD, km
U
SU
% of sites
R
U
11%
% of subs
5
R
27%
4
R
20%
3
ISD, km
2
SU
62%
1
SU
36%
0
DU
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U
SU
R
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U
42%
DU
2%
Traffic load variations over cells
Low traffic
hours
Wireless Network
Traffic is not evenly
distributed over cells
High traffic
hours
Traffic
50% of
traffic
Based on data from
EARTH project
Source:
LTE for UMTS - OFDMA and SC-FDMA Based
Radio Access By Harri Holma,
Antti Toskala Wiley 2009; ISBN 978-0-470-99401-6
45% of
traffic
5% of
traffic
10%
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50%
100% of Cells
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Traffic Models
Traffic Evolution, Busy Hour traffic
Voice coder data more demanding.
12.2 kbps voice = 30 (GSM)-75(3G) kbps
”Equal PS resource” for 2G/3G mix considered
Year
Total kbps
PS kbps
CS kbps
E BH
CS kbps/E
of PS
Daily model
Traffic
BH
Mid
Low
Average
H/day
15
4
5
-
10,00
Load
0,31
0,2
0,1
0,25
2010
0,56
0,113
0,45
0,015
2012
0,84
0,316
0,525
0,015
2014
1,48
0,881
0,6
0,015
2016
3,14
2,46
0,675
0,015
2018
7,63
6,88
0,75
0,015
2020
20,11
19,21
0,9
0,015
Growth
35,7
170,0
2
1
30
35
40
45
50
60
2
Total
36X
Growth
Subscriber
Traffic
evolution
PS
170X
Growth
+67%/Y
Total
kbps
CS
kbps
1,00
CS
kbps
Load
%
Avg
25%
15h
30
20
10
0,10
2010 2012 2014 2016 2018 2020
4h
5h
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Hr/Day
Voice X-over
2013
80%
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Voice
5%
How to improve Efficiency
 Technology Generations
 BS architecture
 Dynamic Power Management
 Modelling Hardware Efficiency
 Spectrum & HW refarming
 BS load utilization
 Energy saving features
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Efficiency Evolution – Technology Generations
Massive MIMO?
Efficiency evolution for
1000
Traffic
growth 10x per 5Y
(58%/Y)
Source: Green Touch
kbps/W
typical Macro Base
station deployment
Transferred bits/W
LTE-A
100
8X
LTE
WCDMA
/HSPA
10
5Y
Total cell average
WCDMA/DCH
1
EDGE
0.1
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LTE-NG
GSM
GPRS
Substantial
improvement
of spectral & BS eff
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”Less to win”
on BS eff.
Close to
Shannon
BS Architectures
Power efficiency* Macro BS
RBS site power efficiency - Example
PCI
Power consumption Index:
Macro => DBS
 Feeder loss elimination
 RRU natural cooling
Avg AC powersite / RF Powerantenna
Total
Eff ”Efficiency”: 4%
PCI = 25
Eff
~
RF
Power
Traffic
model
Climate
model
RBS Site
Backhaul
Mains
Input
Power
Climate
Eq.
Rect.
RBS
 BS HEX or ventilation.
Eff.
65%
 EE ~ double
 With other HW
Eff.
85%
Eff.
50%
Eff.
15%
Energy efficiency* PCI
RBS site power efficiency – Example – RRU 2010
improvements 3-5X EE.
PCI
Power consumption Index:
Total
”Efficiency”: 20%
E
PCI
=5
f
Avg AC powersite / RF Powerantenna
Eff
f
Traffic
model
Climate
model
~
RBS Main
RRU
Mains
Input
Power
Backhaul
HEX
Eff. 95%
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RF
Power
Eff.
90%
Rect.
Eff.
92%
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Base
Band
Eff.
25%
BB&
RRU
Natural
Cooling
Field data – Traffic vs Power Consumption
Source: Bath Green Radio
Conference 2009,
Orange presentation
Power
Consumption
- not scaling
with traffic
Potential for
power saving
- scaling
with traffic
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DPM case - Scaling with load
Equipment view:
- Scaling with load
Power
Consumption
BB, ”Radio”
Poor Scaling!
• Cooling – scales
• PA – fair scaling
PA
• Base Band, ” Radio” i.e. ”TRX”:
Target
- Poor scaling
Cooling
• How to improve?
• Where to improve ?
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Avg
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Load
Max
Modelling of HW Efficiency
 Macro Base Station parts
 Site parts
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Spectrum & Hardware evolution
2010 RAT/BW
2010 RAT/BW
Ban
d
Macro BS
2012
HW
refresh
DU
U
SU
R
7
-
-
-
-
8
-
-
-
-
9
G4C
G2C
G2C
G2C
18
G4C
G2C
G2C
G2C
21
U5
U5
U5
U5
2013-2020 New
RAT/BAND/HW
New
New
New
26
New
Micro/Pico BS
21
-
-
-
100% Macro
Base Stations
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New
-
-
Macro/DBS
Note
DU
U
SU
R
L10
-
-
-
7
Cap &
Coverage
L10
-
L10
L10
8
Cap &
Coverage
G3C
U5
G2C
U5
G1C
U5
G1C
U5
9
GL Multi-RAT
Radio Units
L20
L20
-
-
18
Cap
U20
U5
-
-
21
Cap
L20
-
-
-
26
Cap
21
Cap
Micro/Pico BS
U10
Reuse of sites
+u-Base stations
Ba
nd
-
-
50% Macro
50% DBS
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-
Traffic Load – Utilization of BS
30,0%
Busy Hour Load 2010
25,0%
20,0%
G
15,0%
U
10,0%
5,0%
0,0%
DU
U
SU
R
30,0%
Busy Hour Load 2020
25,0%
20,0%
G
15,0%
U
L
10,0%
5,0%
0,0%
DU
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U
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SU
R
Example of Energy Saving Features
Feature name
Symbol Power Saving
Description & applicability (techno, frequencies, equipment, release ..)
The eNodeB can shut down the PAs in the time of empty symbols. MBSFN sub-frame could be used to reduce
the reference signal further so that more empty symbols are available for PA to shut down
RF Channel Intelligent In MIMO mode, the carrier for a cell is transferred through different transmission channels. When no traffic is
Shutdown
on the cell, the carrier can be switched off on part of transmission channels.
Inter-RAT energy saving
When there is light traffic in an area that is covered by multi-RAT carriers, some of LTE carriers can be blocked,
and all services can be automatically taken over by other RAT carriers that remain in service.
Intra-RAT energy saving
During low traffic hour, deactive some cells and let neighbour cells expand to the coverage hole.
Small cell energy saving
When low traffic in an area covered by Macro and Micro/Pico carriers, some of small cell can be blocked, and all
services can be automatically taken over by macro carriers that remain in service.
Dynamic Cell Power Off
(GSM dual band only)
900 MHz/1800 MHz GSM dual-band network. In a specified period, if the traffic is low and a 900 MHz cell can
carry all the traffic in the coverage area of an 1800 MHz cell, then the 1800 MHz cell can be powered off to
reduce the power consumption of the BTS.
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RAN Results
 Total energy saving 50%

Improvement mechanisms
MWh/Y
Energy Consumption,
100.000 Sqkm Network
500000
- Eff gains 2G – 4G: ”RAT” gain, Single carrier =>
450000
multi carrier, Flexibility of multi RAT BS
400000
EC, 65% CAGR
- Refarming of spectrum and Hardware
- Utilization eff gain
350000
- Energy saving features
300000
- ”Dynamic power management” ie shut down of
250000
redundant resources.
 Issue - How to cope with traffic growth beyond
EC, 65% ESF*
200000
2010
2012
2014
2017
2020
2020?
- The ”total” traffic growth will increase, as PS
 Total energy saving 50%
dominates
 Traffic growth PS only 170X
- Less to win on ”RAT-gain” and utilization
 Traffic growth ”total”: 36X
- New technology candidates:
 ”Total” Efficiency gain: 72X
- LTE-A, HetNet for dense traffic areas,
Massive MIMO, 5G technologies, mm wave
frequencies....
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80,00
RAN Results –
Energy Efficiency
70,00
60,00
Energy Efficiency,
TB/MWh
Area
DU 1,9
U
1.0
SU 0,16
R 0,19
All 0,26
Year 2010
7
2,4
0,3
0,4
0,5
2012
10,8
3,5
0,7
0,8
1,1
2014
26
11.3
2,8
3,7
4.6
2017
E Eff. Growth
kb/J Factor
75 165
39
44,2 97
45
12
26
77
14,3 31
75
18,5 41
70
2020 2020
20102020
50,00
U
SU
R
DU
All
40,00
30,00
20,00
10,00
0,00
2010
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2012
2014
2017
2020
Other studies
Femto offloading Macro BS 1/2
1,9X SE*
w. Femto
[1] Energy Efficient High Capacity network by
offloading hi QoS users to Femto.
HetNet with ”regular” users and few heavy, high
QoS users.
5 X SE
w. Femto
Femto BS for heavy users at ”random worst”
location.
 For a legacy network, EE increases
substantially by adding Femto’s to comply to
traffic growth.
 EE gain 1,9X for ISD 500m and 7X for ISD
800m. The larger ISD, the higher EE gain.
 Highest gain with the first 20% femto’s, than
gain is declining.
 If Femto’s are deployed randomly, there is no
* SE: Spectral Efficiency
EE gain.
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7 X SE
w. Femto
Other studies
Femto offloading Macro BS 2/2
[1] Energy Efficient High Capacity network
by offloading hi QoS users to Femto.
 Adding Femto’s & Backhaul to 100% of
Heavy users adds 10% to RAN Energy
1,8 X EE
w. Femto
3 X EE
w. Femto
consumption, so Energy Saving gain is
still substantial.
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Other studies
Pico offloading Macro
[3] Energy efficiency improvement
through pico base stations for a
green field operator.
Macro ISD adapted for traffic density,
considering pico BS.
Pico BS located at hot spots.
~15% EE gain,
2 Pico, constant
traffic density
 Limited efficiency gain.
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Other studies
Pico offloading Macro
[3] Energy efficiency gains throuigh
traffic offloading and traffic
expansion in joint macro pico
Macro ISD constant. Pico BS added at
hot spots for traffic growth.
 Limited efficiency gain.
5 X Efficiency
when DBS PRB
offloaded
50% Eff gain
when DBS PRB
not offloaded
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Other Studies –
Massive MIMO Energy Efficiency
Reference[5]: E. Björnson, L. Sanguinetti, J. Hoydis, M. Debbah, “Optimal
Design of Energy-Efficient Multi-User MIMO Systems: Is
Massive MIMO the Answer?,” Submitted to IEEE Trans.
Wireless Communications.
Golden Combination:
Large array gain
Many simultaneous users
Fractional pilot reuse
Low Per-Antenna Power
Use handset technology
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Comparison to other studies
Ericsson – Vodafone study
[4] P. Frenger, Y. Jading, and J. Turk, 2013, “A case study on estimating future radio
network energy consumption and CO2 emissions”,
Results: Energy Consumption 2020: -60% ”compared to today”.
Similarities: Smart refarming of Hardware when LTE is introduced.
Differencies: Ericsson /Vodafon study deploys less LTE Macro BS and more LTE Pico
nodes.
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Conclusion
 2010-202: 50% Energy Reduction of RAN Energy Consumption is possible, if
– Spectrum is refarmed and LTE introduced
– HW refreshed, old 2G and 3G equipment phased out for LTE and Multi-RAT BS.
– New efficient BS architecture and Hardware
– Energy saving features - Dynamic power management
– HetNet (micro/pico BS) is used in dense areas
 > 2020: A challenge to further reduce RAN energy consumption
– HetNet, Higher order MIMO, Massive MIMO deployment to support capacity and further
spectrum refarming /Hardware swap.
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Recommended reading
RECOMMENDED READING

[1] Energy efficient high capacity HETNET by offloading high QoS users through femto
Usman, M. ; Vastberg, A. ; Edler, T.
Networks (ICON), 2011 17th IEEE International Conference on
DOI: 10.1109/ICON.2011.6168500
Link: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98289
Publication Year: 2011 , Page(s): 19 - 24

[2] Energy efficiency gains through traffic offloading and traffic expansion in joint macro pico deployment
Arshad, M.W. ; Vastberg, A. ; Edler, T.
Wireless Communications and Networking Conference (WCNC), 2012 IEEE
DOI: 10.1109/WCNC.2012.6214158
Publication Year: 2012 , Page(s): 2203 - 2208

[3] Energy efficiency improvement through pico base stations for a green field operator
Arshad, M.W. ; Vastberg, A. ; Edler, T.
Wireless Communications and Networking Conference (WCNC), 2012 IEEE
DOI: 10.1109/WCNC.2012.6214157
Publication Year: 2012 , Page(s): 2197 - 2202

[4]
P. Frenger, Y. Jading, and J. Turk, 2013, “A case study on estimating future radio network energy consumption and CO2 emissions”,
available at: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6707825

[5]
E. Björnson, L. Sanguinetti, J. Hoydis, M. Debbah, “Optimal Design of Energy-Efficient Multi-User MIMO Systems: Is Massive MIMO
the Answer?,” IEEE Transactions on Wireless Communications, Submitted for publication [Available online: http://arxiv.org/pdf/1403.6150]
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