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USE CASE: ELISA’S DEPLOYMENT OF C-RAN:
LESSONS LEARNED AND APPLICATIONSTeemu Karhima 17.10.2016
Elisa in a nutshell
• Telecommunications, ICT and online service
company
• Market leader in Finland in both fixed and mobile
• 2.3 million customers, 4.74 million mobile
subscriptions
• Population coverage
• 2G and 3G >99.8 %, LTE >98 %
• Multi-vendor network (Nokia, Ericsson, Huawei)
• Mobile data usage 13 GB / user / month. Elisa is
number 3 in the world in the total data amount
(source Tefficient).
CRAN for Elisa
Centralized RAN for Elisa is a solution whichbrings improvedbroadband connectivity to large concentrations of people generating big amount of uplinktraffic within a defined area.
3
Why, Where and How CRAN has been implemented will be revieled in next
30 minutes.
Why?
4
Interferece Limitation
High UL Usage
DL Volume
UL Volume
Continuous Data Growth
+129% per year
13 GB/month/user
201620152014
Where?
5
Hartwall Arena
Cell on Wheels
Ratina Stadium
Helsinki Icehockey Stadium
CRAN Implementation – Hartwall Arena
6
Hartwall Arena Information
• Main indoor areena in Finland: Hockey
games, concerts, events
• Capacity: Sport Events = 13 349 Concerts
= 15 000
• 8 RRH
• 4 CoMP sets, each containing 6 cells
• LTE2600, 20 MHz BW
IRCmax(SINR)per UE
per TTI
6
CRAN Load Test – Hartwall Arena
7
0
2000
4000
6000
8000
10000
12000
14000
16000
CLPCsettings 1
CLPCsettings 1
OLPC OLPC CLPCsettings 1
CLPCsettings 1
CLPCsettings 2
CLPCsettings 2
CRAN off CRAN on CRAN off CRAN on CRAN off CRAN on CRAN off CRAN on
Throughput
ThrCRAN_on – ThrCRAN_off
ThrCRAN_off
CRAN Thp gain [%]
=
×100%
Mass events + loading UEsLoading testsTest scenarios
• 30 friendly UE’s (6 x 4UE’s, 2 x 3UE’s)
• Users having 100% load on cell edge
• CRAN on/off
• Different power control settings
Test set 1 Test set 2 Test set 1 Test set 2
CRAN Load Test – Hartwall Arena
8
0
5
10
15
20
25
0 10 20 30 40 50 60Time [sec]
Cell throughput [Mbps]
CRAN OnRSSI = -95dBm
SINR = +23dB after up to
8Rx IRC antenna combining
UEs could transmit at less
power
creating less interference
the remaining interference
part is totally cancelled
CRAN OffRSSI = -85dBm
SINR = 0dB after 2Rx
MRC antenna combining
extremely interference
limited scenario
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
MC
S [
#]
MCS distribution
CRAN off CRAN on
Results
• BTS log analysis from one cell shows the impact of CRAN
• SINR and MCS have improved which leads to better throughput
• UE power consumption was also reduced
• Ideal conditions for maximum gain (cell edge and 100% load).
Only friendly users load during the test.
UL Quality distribution
LTE Performance During Mass Events
9
2.9 Nickelback
8.9 Finland – Sweden ice hockey
13-14.9 Red Hot Chili Peppers
17.9 Jokerit - Avangard Omsk
19.9 Jokerit - Sibir Novosibirsk
21.9 Jokerit – Metallurg
23.9 Jokerit – TsSKA Moskova
26-27.9 Justin Bieber
• Events during September
Event Traffic Profile
10
Finland – Sweden
ice hockey
Red Hot Chili
Peppers
Jokerit – TsSKA
Moskova (KHL)
Justin Bieber
• Traffic and performance were analysed in different events during September 2016.
• Uplink is much more loaded in concerts than in sport events
• Events that attract younger people generates more traffic
DL Datavolume
UL Datavolume
Performance Analysis
11
During the most congested event (Justin Bieber)
the premium class user performance was still
good. Average DL user throughput was 5 Mbps
and UL user throughput 3 Mbps. People using
the lowest LTE subscription had 2 Mbps (DL)
and 1 Mbps (UL) average throughput.
Cell
1DL User Throughput
UL User Throughput Cell
2
Cell
3
Cell
4
Cell
6
Cell
7
Cell
8
Cell
5
”2 sectors were
carrying nearly 200
RRC users during the
peak hours.
Otherwise load was
nicely balanced
between cells.”
UL Quality
MC
SM
bps
”UL MCS clearly degraded during the event.
PUSCH MSC was below 10 during the concert.”
COW (Cell On Wheels) Concept
12
High capacity movable base station
- 6 sectors
- 40 MHz LTE BW -> 1.8 Gbps
- CRAN
Problem
Typical events last just for 2-3
days per year
Fixed solution is not cost
efficient. In many cases only
1-2 sectors are serving the
event area, and capacity is not
sufficient to provide good
performance.
Huge amount of UL traffic
Events in Finland: Summer
concerts and festivals
Multibeam CoW Implementation
13
First trial in Blockfest in
Tampere
Antenna placed to
manlift
CRAN was not
activated in initial trial
Multibeam Cow Results and Learnings
14
Quality could have been
better. It is expected that
CRAN activation is
required to improve the
performance in uplink
direction during big
events.
Multibeam Cow Results and Learnings
There were clear
dominance areas for
each sector, however
antenna should have
been located closer to
the event.
15
Multibeam Cow Results and Learnings
16
LTE2600 and LTE1800
antenna patterns were
not identical and thus
load was not balanced
in optimal way
Summary
• CRAN is designed for mass events where UL usage is expected to be
huge
• Elisa have implemented one Nokia CRAN solution with positive results
• Due to increasing number of LTE subscribers and applications requiring
high UL speed, more CRAN implementations are being planned
• Arenas and high capacity Cow solution are next targets for CRAN
17
Thank You!