MPLS AS A BACKBONE
NETWORK FOR BROADBAND
WIRELESS ACCESS
George Asare Sakyi
Chief Engineer Ghana Telecom
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Outline of Presentation
9Background introduction
9MPLS architectural & functionality
9eMGW architectural & functionality
9Economic & social Benefit of bbwa
& Conclusion
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Background introduction
Competition between Mobile & Fixed lined Operators and the need to add
value to the fixed line to be in business
Telephone usage
3,000,000
2,500,000
2,000,000
Fixed lines
1,500,000
Mobile
1,000,000
500,000
0
1999 2000 2001 2002 2003 2004 2005 2006
ye ar
Introduction of Broadband services
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Objectives of the Architecture and the Functionality of
MPLS
o To satisfy diverse VPN customer requirement taking
into consideration that
o Each customer has different security concern with a
number of site at different location
o Customers may be routing complex mission critical
application with a defined traffic pattern and volumes
o A service provider must therefore offer subscribers a
portfolio that contains a number of different VPN
service delivery models that can take care of the
tradition VPN, Frame relay and ATM layer2 among
others
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
The Basics of MPLS
• MPLS stands for Multiple protocol label switching
• It could be defined as a mechanism that allows service
providers to use their IP backbone to provide VPN
services to their customers
• A VPN is a set of sites which share common routing
information and whose connectivity is controlled by a
collection of Policies
• The BGF element of MPLS is used to establish the
virtual circuits and to forward VPN traffic across the
backbone to remote VPN sites
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Primary objectives of the routing principles
• To make service very simple for customers to use even if
they lack experience in IP routing
• To make the service scaleable and flexible to facilitate
large scale deployment
• To allow the service provider to deliver a critical value
added service that galvanizes customer loyalty.
• The main elements in MPLS network topology are;
• The customer’s edge, Providers edge, Provider’s routers
and the virtual private network routing table.
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
MPLS NETWORK COMPONENT
Provider Network
CE
PE
P
CE
PE
CE
CE
P
P
CE : CUSTOMERS EDGE
P :PROVIDER EDGE
PE : PROVIDER EDGE
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Data flow
• In order to use MPLS to forward VPN traffic across the
providers backbone, LSP must be established between
the providers Edge router that learns the route and the
PE router that advertises the router.
• LSP could be established and maintained across the
service provider’s network using either LSP or RSVP
• To ensure multi vendor interoperability all PE and
Providers routers are required to support LDP
• Routers use this label to make their forwarding decision
• The label is looked up in forward table which then
determine the destination packet to be forward
• The label also determines new label to be used on
outgoing packet
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
LSP ESTABLISHMENT
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Switches Countrywide
Bawku
C.dot
512
Navrongo
alcatel
750
Bolgatanga
alcatel
3K
Wa
alcatel
3K
Gambaga
Walewale
neax
112
neax
112
Yendi
Bole
neax
112
c.dot
350
Tamale
neax
5K
Damango
neax
112
Salaga
Buipe
COTE
D'IVOIRE
Yeji
Atebubu
neax
100
Wenchi
neax
236
Ketekrachi
neax
246Hohoe
c.dot
360
Berekum
neax
701
neax
2460
Techiman
c.dot
360
Sunyani
neax
5.536K
Dormaa
Ejura
Bechem
adc
240
Mampong
alcate
5k
Bekwai
neax
120
neax
112
Elebo
alcatel
2k
Mampong Akim
Mpraeso
neax
360
Oda
alc.
Nsawam 2k
fetex
572
alc.
1k
Samreboi
Konongo
fetex
572Suhum
c.dot
500
Dunkwa
Enchi
neax
240
alcatel
alcatel
2k
1k Nkawkaw
alcatel
5k
neax
120
Donkorkrom
adc
960
UST l
Obuasi
Asankrangwa
Amedzofe
neax
110
neax
236
Tanoso
alcatel
5K
Buokrom
alcatel
5kKumasi
alcatel
40k
neax
584
Swedru
Tarkwa
alcatel
5k
neax
2000
Sekondi
fet.
3k
Ax
TOGO
neax
112
neax
112
c.d im
5 2 ot
0
Ta k
ora
alc. di
1
Winn
eba
fetex
541
Cape
neax
Coas
t
& fet.
8k
neax
261
Ho
neax
3768
Akosombo
alcatel
2k
Koforidua
fet.& alc.
9k
Aburi
neax
110
Acc
ra
Tem
a
Nor
th
GT. Accra
Ada
WSX
3 50
Tema
1.Tema A-alc.15.8k
2.Tema B-alc.10.2k
3.Tema-D1.alc.3.5k
4.Tema- D2.alc.5k
3.4k
The aim is to add broadband to all cupper in all exchange area.
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Last mile using eMGW
Emgw stands for enhance multi gain wireless
The main elements of the eMGW are the
the base station controller, the base station Radio unit
and the subscriber terminal unit.
The main function of the Base station is to interface the
switching equipment for the voice component of
configuration
It also links the 100 baseT for packet data to enable
IMS proxy domain management
The protocol used between the base station controller
and the switch is V5.2
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Basic Traffic calculations
• What is traffic ?
• Traffic could be defined as the product of the number of
calls during a period of time and the their average
holding times
• This could be expressed as;
• A = S * Y/ T where A is traffic;
• S is the calling rate ,Y is the holding time
• And T is the observation time normally one hour
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Base station Radio unit
•
•
•
•
Has an in built antenna
Weather proof outdoor unit
Remote power from the BSC
The functionality include provision of radio coverage for
the terminal unit
• Handles traffic of 8 channel of 64kps
• Or 16 channel 32kps
• Packet switch data up to a max of 510kps full duplex
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Site Dimension
No of bsrc
Traffic in Erlangs
Lines connected @0.07 erl
1
8.8
126
2
22
314
3
36.1
515
4
50.6
723
5
65.4
934
6
80.3
1147
8
110.6
1580
For example if the calling rate per cell site is 1000 calls per hour and
the average holding time for each call is 90 s then by our definition
traffic = 1000* 90/3600 which is 25erlang.
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
The International internet connectivity backbone
Portugal
Espagne
Iles
Canaries
ATLANTIS 2
Sénégal
Côte d'Ivoire
Inde
Ghana
Iles du Cap
Vert
Bénin
Malaisie
Nigéria
Cameroun
Gabon
BRESIL
Angola
Ile Réunion
Ile Maurice
Afrique
du Sud
SAT-3/WASC/SAFE
ARGENTINE
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
eMGW – System Setup
PSTN
V5.
2E
1s
BSC
E1
Switch
Router / BRAS
eT
as
0B
10
10Ba
seT /
E1
32km Range
Network
Core
8 to 1000Erlang / Cell or
IMS
Ethern
et
Corporate
ISPs
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Current IP/MPLS Deployment
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Economic and Social Benefits Using MPLS
The MPLS network could be used as back bone to
serve a great number of customers
Could be used to provide the traditional lease line.
Is being used to network customers service point for
various institution across the country
Could be used to transport billing information to a
centralized point
Is being used to provided broadband services through
out the country
Encouraging entrepreneurship and job creation among
the youth
ITU-BDT Regional Seminal on Broadband wireless Access
Yaoundé 18 – 21 September 2006
Thanks for your attention !
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