ACCESS NETWORK SOLUTIONS FOR DEVELOPING COUNTRIES ON THE WAY TO NGN

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ACCESS NETWORK SOLUTIONS FOR DEVELOPING COUNTRIES
ON THE WAY TO NGN

• N. Parvanova, I. Stanev, K. Stoichev, B.
  Bardarski-NIIS, BTC, Bulgaria, M.Buchner
  VPIsystems, Germany, J.Haentzschel Siemens ICN,
  Bulgaria

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Agenda

• Introduction
• Evolution to NGN and access network solutions
• Broadband access planning for major Bulgarian
  cities (Plovdiv and Sofia)
• Conclusions

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Introduction

• NGN architecture generalized in four layers

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Introduction

• NGN deployment in the metro networks is a
  continued process.
• It is very important, during this transition, not
  a single customer to find out any differences in
  Quality of Service (QoS).
• The QoS should not only be same, but even better.

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Different levels of NGN architecture
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Evolution to NGN and access network solutions

• The traditional switch in the existing network
  needs to be separated into functional blocks.
• Key requirement of the incumbent operators is
  reuse of existing equipment (functional blocks).
• Most vendors have developed solutions where the
  existing access equipment and / or switch
  equipment can be transferred into the NGN
  network.

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Todays TDM network
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Scenarios for network development to NGN on the
local exchange level

• Scenario 1 Deployment of equipment compatible to
  future NGN solutions
• Scenario 2 Deployment of NGN islands in the
  access network
• Scenario 3 Deployment of overlay NGN access
  network

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Scenarios for network development to NGN on the
local exchange level (2)

• Scenario 1 Deployment of equipment compatible to
  future NGN solutions
• The scenario includes deployment of Multiservice
  access nodes and DSLAMs.
• During the transition towards NGN this equipment
  smoothly integrates to NGN by means of
  centralized or decentralized access gateways
  (AGW).
• This is a conservative scenario, referred to NGN
  introduction, but it allows maximum utilization
  of the existing copper cables and it is
  comparatively easy for realization.

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Scenarios for network development to NGN on the
local exchange level (3)

• Scenario 2 Deployment of NGN islands in the
  access network
• PSTN exchanges are replaced with AGW and
  residential gateways situated at the customer
  site (RGW).
• NGN class 5 islands are formed in the TDM
  network, connected via MAN.
• Trunk gateways (TGW) are used for interconnection
  with PSTN.

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Scenarios for network development to NGN on the
local exchange level (4)

• Scenario 3 Deployment of overlay NGN access
  network
• RGW and AGW are being deployed in the areas
  served by existing TDM equipment for new and
  business subscribers to meet their demands on new
  state-of-the-art services.
• Overlay NGN access network with Class 5
  softswitches is created.
• Gradually, this network is expanded till the
  total replacement of the existing TDM equipment.

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Scenarios for network development to NGN on the
local exchange level (5)

• Step 1
• Replace one TDM switch with a combined TDM- /
  Soft-switch
• At least the access equipment of the traditional
  switch needs to be reused, otherwise the upgrade
  costs will rise tremendously.

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Step 1 to a NGN in the access network
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Step 2

• Once the combined (or separate switch) has been
  implemented into the network further access units
  can be added.
• A strong IP backbone is the base for adding of
  NGN access units.
• New protocols (e.g. H.248, MGCP, H.323, etc.) can
  be introduced to the network, that allows the
  implementation of services like xDSL, which were
  previously restricted to the availability of the
  data network (usually ATM).

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Combined switch with traditional Access equipment
as well as NGN access equipment
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Broadband access planning for major Bulgarian
cities (Plovdiv and Sofia)

• Planning studies for introduction of xDSL
  equipment in the cities of Plovdiv and Sofia
• All studies are performed with specialized
  network planning tool, VPI AccessMaker, which has
  unique parameters and capabilities

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Case study Plovdiv

• Introduction of broadband services to business
  (SOHO and SME) and limited number of residential
  customers served by xDSL equipment
• Three categories of services are assumed - ADSL
  Basic (256/64 kbit/s) for residential and SOHO
  customers, ADSL Gold (512/128 kbit/s) and SHDSL
  (512 kbit/s) for SME customers.

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Forecasting results for the possible customers in
the period 2003 2007
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For the period 2003 2007 it is assumed to have

• 100 growth of SOHO customers,
• 90 growth of SME customers,
• 10 growth of SHDSL customers.
• 20 decrease of the annual installation fees,
• 10 decrease of the annual subscription fees
• 16 discount factor

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Optimized DSLAM locations in Plovdiv
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Optimization results - Plovdiv

• Optimization result shows one DSLAM for each
  existing exchange area, situated in the exchange
  building.
• There is one area, where a second DSLAM will be
  needed and its location is optimized.
• The Planning tool has also produced economic
  analysis with calculation of costs, revenues,
  cash flow NPV and IRR.

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Economic analysis of xDSL in the access network
of Plovdiv
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Preliminary study for Broadband access
introduction in the city of Sofia

• Services to be offered
• ADSL-Basic (for residential and SOHO customers),
• ADSL-Gold for SME customers,
• SHDSL for business users
• FE for Large Enterprises.

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Forecasted services for the period 2003 - 2007 in
Sofia
Services to be offered ADSL-Basic (residential) A
DSL-Gold SME SHDSL - business users FE - Large
Enterprises
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Broadband Services Network Modelling - Network
Design
Technologies - DSLAMs, DSL, Routers, FE, GE
DSLAMs - 8, Routers - 12
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Broadband Services Network Modelling - View
Rollout
Annual Costs - DSLAM
Number of interfaces per year
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Broadband Services Network Modelling - Economic
Analysis
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Conclusions

• Introduction of NGN technologies in the access
  network could be performed with different
  scenarios, depending upon the local conditions
  and market goals of the telecom operator.
• It will permit to enrich the service portfolio
  offered to the customers and will generate
  additional profit.

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Conclusions

• Evolution from the current TDM to the future NGN
  is a long process, which requires careful
  planning and precise analysis of the different
  possible strategies for NGN solutions in the
  access network.
• Advanced planning tools will be required to
  perform all necessary studies and in this way to
  avoid wrong decisions.

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Thank you !