LS Telcom Summit 2010

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LS Telcom Summit 2010
Tetra Security Communication
System
In Stockholm Metro
Håkan Samuelsson
CTO
Axell Wireless
www.axellwireless.com
Short Corporate Overview
•
•
•
•
•
Axell Wireless is the leading European manufacturer of
confined area coverage solutions
250 Staff
The core portfolio now includes:
– Cellular solutions including LTE
– Tetra, Tetrapol, CDMA, C2000
– VHF and UHF
– FM, DAB and DVB-H Broadcast
– Software defined multiband repeaters
Key areas of focus:
– Public safety
– Transport (primarily Rail and Metro)
– Cellular and next wave Wireless
30 years of history in the field of providing wireless
coverage solutions
The Stockholm Underground
• 105 km of metro lines
• First part built in 1950 and last station opened 1975
• 100 stations
– 70 underground stations
– 30 surface stations
www.axellwireless.com
3
The Stockholm Underground
Previous underground coverage solution
• The existing SubCom system delivered
•
1991-1993
Distributed three different radio services in
underground sections
–
–
–
–
SL Train Communication Radio (160 MHz)
Swedish Police System (400 MHz)
Fire & Rescue radio (400 MHz)
900MHz and 1800MHz injected at each
station (4 operators)
• During commissioning both the old and new
system active at the same time
– ”Engineering hours” about 2-3 hours per
night
– Mobile operators systems active at all times
5
Reasons for implementing the
ERDM system
• SubCom system at the end of it’s life span (17+ years in service)
• Analogue train radio system at the end of it’s life span
• New nation wide TETRA system in Sweden
– Police
– Fire and rescue
• FM radio to the passengers underground
• Preparation for new train radio (SL own TETRA system)
• RF over Fibre Solution
– Flexible solution that can be adapted and added to
– Supervision possibilities much better
2010-06-24
www.axellwireless.com
6
Many Challenges
•
•
•
•
•
•
•
•
Several new wireless services
Very high redundancy required
Smooth transition from the old system
Limited number of optical fibres available
Optical add and drop coupling had to be used
High optical fibre losses
Many remote heads connected to each TBS
Existing radiating cable almost 20 years old
Fibre optic repeater system
4-Way
4-Way
4-Way
4-Way
TETRA: 36 dBm/ch @ 1 ch
TETRA: 33 dBm/ch @ 2 ch
TETRA: 30 dBm/ch @ 4 ch
n
3
BSF424
2
BSF424
1
BSF424
BSF424
OMU – Optic Master Unit
Compact size and
convectional cooling
BTS
Avitec Master Unit
OMU
The Metro Network
Sä
tra
Airlink BussKom Tetra
Off Air repeater
Mör-Aka
Sä
tra
Sibeliusgången
Aka
Golfvägen
Airlin
g
Kym
Urs
s
g
g
RI
g
Duv
s
s
g
s
Sbg
s
g
S
ra
ät
Pajalagatan
Tågradio
Buss
Kom
Blb
Vby
Häs
link
Häg
Huv
g
Jol
Råc
g
s
aL
ihVb
g
Väs
s
s
g
y
Åkh Bmp Abh Smo
Alv
s
s
g
s
Våb s
om
ssK
Bu
link
Air
lu
)-H
(Lih
mt
aÖ
Tetr
Fij
Brä
s
s
g
g
Mäh Axb
s
g
Öbg
s
g
s
g
g
g
Hot
Zid
Mrt
g
g
g
s
e
Tågradio VHF,
from site Ensta
Ros
Fiber Optic Remote Site
e
Gär
s
Kap
s
s
Tce
s
s
s
g
s
g Tågradio VHF, from site Götgatan
Ktg
g
Fhp (Höt)
Blb (Höt)
s
Buss
Kom
Ömt
g
Gas
Riddargatan
Tågradio
s
e
Tågradio VHF, from site Sätra
Tågradio VHF, from site Ensta
Optical Master Unit (OMU)
Fiber Optic
Interface
(Tranciever)
VHF/UHF
fiber combiner
Nnn and wdm coupler
Slu
s
g
g
Mbp
g
Skt
s
s
from BTS Liljeholmen
from BTS Västra skogen
Ömt
rum g
g
g
from BTS Östermalstorg
from BTS Mörby centrum
from BTS T-centralen
s
Buss
Kom
Tce
Tågradio
Border outline colour indicates
corresponding BTS Master Site
Kulturhuset
g
g
Skh
Optical
Regenerator
Tfp
Gup
g
s
g
s
g
Lih
Hså
Sä
tra
Sä
tra
g
g
g
Buss
Kom
Tågradio
Skb
Glb
Frä
Hyö
Blu
Eng
m
Ko
ss
Bu
Bjh
Sab
Sop
Te
-Fa
g
Tak
s
tr
Sä
Stb
Glavagatan
Bah
Bam
s
a
Sedelvägen
Nor
Lih
Svm
Buss TågKom radio
Kät
Skg
tra
g
el
s
Hså
Buss
Kom
tra
Lih
link
Air
SL
vhf
s
g
Optisk splitt Mik/Nybohov
g
e
g
s
Sä
g
Hlu s
s
g
s
g relä rum
s
s
s
Vät
g
Alb s
e
s
g
s
Tågradio VHF,
from site Götgatan
Tågradio VHF,
from site Sätra
Border outline colour indicates
corresponding BTS Master Site
g
Råh
s
g
s
Tåg- Buss
radio Kom
s
Std g
Mik
Fik s
Nob
g
e
s
g
s
Nybohovsbacken
g
Skarpbrunnavägen
Ros
Ros
s
g
s
Fhp
Asu
s
g
Våg s
Mas s
Sät
g
Tce
Skh
s
Alb
s
Buss
Kom
Buss
Kom
Skh
g
Fhp
Thp
Off Air repeater
system for VHF
(Tågradio)
Connected with fiber splitter
s
Optical
Regenerator
Unt
Teh
g
g
s
g
Tce
s
g
Västra skogen
s
FM
g
Krb
Äbp
Ålk
Sep Odp Rmg Höt
Sah
g
Ilt
g
g
Distribution off
FM broadcast
In separate fibers to...
s
s
Beh
Tce
Lih
g
Bu
ssK
om
Te
tr
Buss
Kom
g
s
Air
g
T-centralen
Liljeholmen
Ropsten stn
Soc
s
g
Das
Johan Enbergs väg
g
Vre
s
g
Väs
När
s
Mör
ta
VH
am F S
pli ätr
VH fied a inp
V
F
u
am Götg äs +s t from
o
pli
fie atan uthb Ak a
d V in
o
äs put und
+n
orth from
Hab
bo Tce
un
g
d
g
Ris
Vby
Mör
Östermalstorg
Mörby centrum
ör-R
os
s
s
En
Rib
g
s
Buss
Kom
Kis
g
s
s
Tågradio
n
s
Tågradio
at
an
Ten
s
Buss
Kom
Aka
Aka
Tetr
aM
G
ötg
ata
g
Off Air repeater
system for Tetra
ssK
om
ata
n
Hub
s
G
ötg
Hju
g
k Bu
s
G
ötg
Opticlink BussKom Tetra Mör-(Aka)-Hju
Hju
Fas
Höd
g
Guä
Snk
s
Hök
BET ANT
ÄNDRINGEN AVSER
SIGN DATUM
s
Råg
Hag
Tågradio
Buss
Kom
g
Far
g
Fas
s
s
RITAD AV
GRANSK AV
DATUM
BLAD
T OSJ
2009- 10- 16
1 ( 1)
ST OCKHOL M MET RO
Ov e r v i e w ERDM
FILNNAMN inkl RITNINGSNUMMER
ÄNDR BET
Redundancy
•
•
•
•
•
Overlapping coverage between stations
Two independent TBS sites providing the capacity
One dedicated TBS and one off-air fed TBS providing redundancy
Two independent fibre paths feeding each repeater
Redundant station coverage provided by the adjacent stations in
case of a repeater failure
• FM radio coverage not redundant
Redundancy
• The coverage from each station reaches the adjacent stations
• Two TBS can feed every repeater or every second repeater
General Concept
Drop couplers
Drop couplers
The Metro Network
Sä
tra
Airlink BussKom Tetra
Off Air repeater
Mör-Aka
Sä
tra
Sibeliusgången
Aka
Golfvägen
Airlin
g
Kym
Urs
s
g
g
RI
g
Duv
s
s
g
s
Sbg
s
g
S
ra
ät
Pajalagatan
Tågradio
Buss
Kom
Blb
Vby
Häs
link
Häg
Huv
g
Jol
Råc
g
s
aL
ihVb
g
Väs
s
s
g
y
Åkh Bmp Abh Smo
Alv
s
s
g
s
Våb s
om
ssK
Bu
link
Air
lu
)-H
(Lih
mt
aÖ
Tetr
Fij
Brä
s
s
g
g
Mäh Axb
s
g
Öbg
s
g
s
g
g
g
Hot
Zid
Mrt
g
g
g
s
e
Tågradio VHF,
from site Ensta
Ros
Fiber Optic Remote Site
e
Gär
s
Kap
s
s
Tce
s
s
s
g
s
g Tågradio VHF, from site Götgatan
Ktg
g
Fhp (Höt)
Blb (Höt)
s
Buss
Kom
Ömt
g
Gas
Riddargatan
Tågradio
s
e
Tågradio VHF, from site Sätra
Tågradio VHF, from site Ensta
Optical Master Unit (OMU)
Fiber Optic
Interface
(Tranciever)
VHF/UHF
fiber combiner
Nnn and wdm coupler
Slu
s
g
g
Mbp
g
Skt
s
s
from BTS Liljeholmen
from BTS Västra skogen
Ömt
rum g
g
g
from BTS Östermalstorg
from BTS Mörby centrum
from BTS T-centralen
s
Buss
Kom
Tce
Tågradio
Border outline colour indicates
corresponding BTS Master Site
Kulturhuset
g
g
Skh
Optical
Regenerator
Tfp
Gup
g
s
g
s
g
Lih
Hså
Sä
tra
Sä
tra
g
g
g
Buss
Kom
Tågradio
Skb
Glb
Frä
Hyö
Blu
Eng
m
Ko
ss
Bu
Bjh
Sab
Sop
Te
-Fa
g
Tak
s
tr
Sä
Stb
Glavagatan
Bah
Bam
s
a
Sedelvägen
Nor
Lih
Svm
Buss TågKom radio
Kät
Skg
tra
g
el
s
Hså
Buss
Kom
tra
Lih
link
Air
SL
vhf
s
g
Optisk splitt Mik/Nybohov
g
e
g
s
Sä
g
Hlu s
s
g
s
g relä rum
s
s
s
Vät
g
Alb s
e
s
g
s
Tågradio VHF,
from site Götgatan
Tågradio VHF,
from site Sätra
Border outline colour indicates
corresponding BTS Master Site
g
Råh
s
g
s
Tåg- Buss
radio Kom
s
Std g
Mik
Fik s
Nob
g
e
s
g
s
Nybohovsbacken
g
Skarpbrunnavägen
Ros
Ros
s
g
s
Fhp
Asu
s
g
Våg s
Mas s
Sät
g
Tce
Skh
s
Alb
s
Buss
Kom
Buss
Kom
Skh
g
Fhp
Thp
Off Air repeater
system for VHF
(Tågradio)
Connected with fiber splitter
s
Optical
Regenerator
Unt
Teh
g
g
s
g
Tce
s
g
Västra skogen
s
FM
g
Krb
Äbp
Ålk
Sep Odp Rmg Höt
Sah
g
Ilt
g
g
Distribution off
FM broadcast
In separate fibers to...
s
s
Beh
Tce
Lih
g
Bu
ssK
om
Te
tr
Buss
Kom
g
s
Air
g
T-centralen
Liljeholmen
Ropsten stn
Soc
s
g
Das
Johan Enbergs väg
g
Vre
s
g
Väs
När
s
Mör
ta
VH
am F S
pli ätr
VH fied a inp
V
F
u
am Götg äs +s t from
o
pli
fie atan uthb Ak a
d V in
o
äs put und
+n
orth from
Hab
bo Tce
un
g
d
g
Ris
Vby
Mör
Östermalstorg
Mörby centrum
ör-R
os
s
s
En
Rib
g
s
Buss
Kom
Kis
g
s
s
Tågradio
n
s
Tågradio
at
an
Ten
s
Buss
Kom
Aka
Aka
Tetr
aM
G
ötg
ata
g
Off Air repeater
system for Tetra
ssK
om
ata
n
Hub
s
G
ötg
Hju
g
k Bu
s
G
ötg
Opticlink BussKom Tetra Mör-(Aka)-Hju
Hju
Fas
Höd
g
Guä
Snk
s
Hök
BET ANT
ÄNDRINGEN AVSER
SIGN DATUM
s
Råg
Hag
Tågradio
Buss
Kom
g
Far
g
Fas
s
s
RITAD AV
GRANSK AV
DATUM
BLAD
T OSJ
2009- 10- 16
1 ( 1)
ST OCKHOL M MET RO
Ov e r v i e w ERDM
FILNNAMN inkl RITNINGSNUMMER
ÄNDR BET
CWDM technology
• The downlink path lasers in the 1270-1350 nm wavelength range
• The uplink path lasers use 1510-1590 nm wavelength
• 2 DL lasers over one fibre (high dynamic range required)
• Each UL path has a different wavelength in 20 nm separation
Fibre Regenerator
• Fibre link performance deteriorates
over 10dB optical loss
• With 4 add/drop couplers optical
losses often exceed 10dB
• The fibre regenerator restores the
optical power
Redundant Off-air Sites
• Separate off-air repeaters for:
– VHF (160MHz)
– FM (88-108MHz)
– Tetra Busskom
– Tetra Rakel
Old cables
• Coax cables in tunnels are subjected
•
•
•
•
•
to vibration and chocks
Connectors are the weak points
The end result is often PIM (Passive
Intermodulation)
PIM caused by broadband signals can
block out a whole system
Avoid placing cables hangers near
cable connections
Check cables before re-use with TDR
and PIM measurements
ERDM Test and Verification
88-108
• Rigging a test train with instruments
160
400
GPSr
Multiband
Combiner
RS 232
GPIB
AC
adapter
Test receiver
R&S
230VAC
230VAC
RS 232
Counter
Pulses
12VDC230VAC
Doppler
12VDC
Battery
Pack
Charger
Rectifyer
Radar pulses to track
Train AC power
230VAC
– R&S Test Receiver (ESPI)
– Laptop logger, Axell in-house
developed test software
– Doppler radar to detect train
movement
– GPS sync of clocks for accurate
time stamps
Example of test log
• Vertical plot – quick overview
• Horisontal plot – detailed information
Why using a fibre fed DAS ?
• Most Tetra calls inside the metro stations and tunnels are group calls
• Each TBS involved in one group call allocates one time slot for this call
• Distributing the capacity from one multi carrier TBS over the entire line
•
provides a much higher trunking efficiency than having multiple
separated TBS on the stations
The high level of redundancy required would be very difficult to get with a
TBS-only solution
Coverage with Base Stations
H
CC
M
H
TC
H
CC
M
H
TC
H
CC
H
TC
H
TC
H
CC
M
H
TC
H
TC
M
M
H
CC
H
CC
M
H
TC
H
TC
H
TC
H
TC
H
TC
H
TC
With repeaters and high capacity - TBS
Group Call
H
CC
H
TC
H
TC
A
420.625 MHz
H
TC
H
TC
H
TC
H
TC
421.725 MHz
H
TC
H
TC
H
TC
H
TC
422.225 MHz
H
TC
H
TC
H
TC
H
TC
420.125 MHz
M
Conclusions ?
• Moving from the old to the new system without interruption was a challenge
• A mix of GSM, UMTS, TETRA, PMR and FM Broadcast a planning challenge
• Passive Intermodulation can kill a multi band system, use PIM-free parts
• A Network under the surface Network will create interesting hand-over issues
• Radiating cables are not perfect for all frequency bands (88 – 2100 MHz)
• What about new services in the future?
LS Telcom Summit 2010
Thank you!
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