ITUITU-D/ ITUITU-T Seminar on Standardization and
Development of Next Generation Networks for the
Arab Region
29 April – 2 May 2007, Manama, Barhain
Planning and design requirements for NGN
Oscar González Soto
ITU Consultant Expert
Strategic Planning and Assessment
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 1
Network Planning Requirements
Content
• Role of Network Planning
• Requirements
• Domains and methodology
• Network design issues in NGN
• Strategic Planning and Technology mapping
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 2
Network Planning Requirements
Mission of network Planning
“Decision making on the network deployment
to Optimize Business and Quality
based on quantitative evaluation”
• Considering geo-marketing scenarios and traffic demand
• Overall vision on the network layers
• Deciding network topology, interconnection and routing
• Optimizing balance between performance/SLA and cost (CAPEX
+ OPEX)
• Considering regulatory constraints
• Anticipating business evaluation and feasibility
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 3
Network Planning Requirements
Key requirements in competition (I)
• Strategy Oriented Needs
– What selection of customer classes and associated services?
– When to decide migration to new technologies and what speed?
– Which level of convergence versus specialization?
– What resources to built and what to lease ?
– Which are the most convenient partnerships with other operators
and suppliers?
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 4
Network Planning Requirements
Key requirements in competition (II)
• Business Oriented Needs
– Which services have to be introduced through time ?
– What is the best service bundling per customer type ?
– How to maximize revenues ?
– How to reduce capital expenditure ?
– How to reduce operational expenditure ?
– How to price services and bundles?
– How to optimize network profitability?
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 5
Network Planning Requirements
Key requirements in competition (III)
• Network Oriented Needs
– How to forecast new services and traffic demands?
– How many nodes to install ?
– What is best location for systems and related communication media ?
– What is the best network architecture and routing ?
– How to plan capacity evolution and solutions migration at access,
local and transit segments?
– How to ensure QoS across multiple domains?
– How to ensure protection level and survivability?
– How to ensure and manage SLA ?
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 6
Network Planning Requirements
Key requirements in competition (IV)
•
Operation Support Needs
– How to evaluate alternatives for direct vs outsourced
operation ?
– How to organize the operation processes ?
– Which level of integration is needed to operate multimedia
services?
– Which IT applications ensure an efficient support to
operation ?
– How to plan labor force training on the new operational
activities ?
April-May, 2007
slide 7
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements :
Network Modeling for planning
• High complexity of the
whole Network requires a modeling and
splitting in subnetworks to facilitate analysis , design and planning.
• By Layers in a vertical dimension following the client-server relation
(one layer is supported in the layer below and provides resources for
the layer up). Physical, Transmission, Switching, etc.
• By Segments or splitting of the end to end communication into subareas as customer premises, access, core national, core international
• By Technologies or underlying technique as
SDH, WDM, ATM, IP,
IMS, GSM, 3G, WiMax, etc.....
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 8
Network Planning Requirements
Network Layer Modeling for planning
IP
Voice Mail
SMP
Service and Control level
VoIP
TVoDSL
VOD
UMS
e-applications
SMS-C
SCP
IN
HLR/AuC TSC
EIR
SSW
BTS
SSP
MSC
TEX
SSP
Int’l
BSC
POP/LEX
WLL/Mobile
GW
Fixed NB/BB
DATA/IP
LL
NGN network
Functional level
Transport/SDH/WDM
Infrastructure and Cable level
April-May, 2007
slide 9
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements
Technological alternatives at core
Origin Scenario
Circuit based
Target Scenario
Packet based
Managed
Dark
Fiber Lambda Bandwith
Multiservice
ATM/FR/IP
ATM VPN, IP VPN
IP
IP
Internet
Gbit access
IP VPN
Ethernet
ptp
LAN to LAN
connection
GigE,10/100BT
GigE,10/100BT
Ficon,Escon,
Ficon,Escon,
Fibre Ch..
ATM/FR
ATM/FR
SDH
SDH
Optical
Optical switching
switching
DWDM
DWDM equipment
equipment
IP
IP Routing
Routing
Ethernet
Ethernet
GigE
Optical
Optical fiber
fiber
Physical
Physical Infrastructure
Infrastructure
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 10
Network Planning Requirements
Planning activities
Optimization
Optimization
Assignment
Assignment
and
and
Routing
Routing
Configuration
Configurationand
and
Location
Location
Demand forecasting
Inputs generation
April-May, 2007
Dimensioning
Dimensioning
and
and
QoS
QoS
Costing
Costingand
andbusiness
business
Results analysis
slide 11
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements
Network Planning Domains
Fixed
FixedAccess
Access
Planning
Planning
Access
Accessradio
radio
planning
planning
Business
BusinessPlanning
Planning
Core
Coreradio
radio
planning
planning
April-May, 2007
Fixed
FixedSwitching
Switching
and
and
routing
routingplanning
planning
Signaling
Signalingand
and
control
controlplanning
planning
IT,
IT,OSS,
OSS,NM
NMand
and
Applications
Applicationsplanning
planning
Transmission
Transmission
planning
planning
ITU/BDT Network Planning requirements - O.G.S.
slide 12
Network Planning Requirements
Planning: Main supporting pillars
April-May, 2007
Architecture and
Technology KnowHow
Operational Research
and optimization
Economical
Engineering
Teletraffic
Methodology
Market and demand
forecasting
NETWORK PLANNING METHODOLOGY
ITU/BDT Network Planning requirements - O.G.S.
slide 13
Network Planning Requirements Scope:
Main supporting pillars
NETWORK PLANNING METHODOLOGY
Teletraffic
Methodology
• Statistical flow modeling for arrival rates and
holding times
• Capacity models based on stochastic processes:
Analytical and Simulation
• Dimensioning based on efficiency, performance
and QoS
• Good foundation on the multiple contributions
from the International Teletraffic community (ITC)
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 14
Network Planning NGN and IMS
Content
• Role of Network Planning
• Requirements
• Domains and methodology
• Network design issues in NGN
• Strategic Planning and Technology mapping
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 15
Network Planning Requirements
Modeling issues for NGN and 3G
– New models needed to represent multiservice flows
– New dimensioning methods for resources handling multimedia
services with QoS
– New measurement procedures for aggregated multiservice traffics
– New multicriteria dimensioning for 3G and xG combining coverage
by frequency, service speed and data traffic capacity
– Which procedures to ensure interoperability and end-to-end
performance across multiple domains?
– Which units to define dimensioning and costing units for
interconnection?
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 16
Network Planning Requirements
QoS and Performance Issues
• Quality of Service (QoS) domains to be modeled, defined and/or extended
for NGN and 3G. Measured in waiting time and/or loss probabilities
• Domains for QoS evaluation:
- Service accessibility: capability to access a service
- Connection establishment: Capability to get connection
- Information transfer: Quality of information delivery
- Reliability: Failure probability
- Availability: Probability of system being active
- Survivability: Capability to provide service in abnormal conditions
- Security: Information and systems protection level
- Qualitative: Intelligibility, audibility, visualization ... of information
content as derived from user perception (MOS)
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 17
Network Planning Requirements
Traffic flows for QoS based dimensioning
– T1) QoS constant stream: bandwidth transmission at a
constant speed with a specified delivery and jitter (ie: video
distribution)
– T2) QoS variable stream : bandwidth transmission at a variable
speed derived from a user information and coding algorithm which
requires guaranteed quality and specified jitter (ie: VoIP, Video
streaming, audio streaming, etc.)
– T3) QoS elastic: bandwidth transmission at a variable speed
without jitter restrictions and asynchronous delivery (ie: browsing,
file transfer, mail, UMS, etc.)
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 18
Network Planning Requirements
Performance Issues: case of VoIP
Perceived Quality of Service as a function of the number of crossed domains for
the G.711+PLC coding with ppp = .01 and gold /silver SLA (19th
International Teletraffic Congress September 2005, Beijing)
High importance of the number of crossed domains and quality per
domain on the end-to-end performance
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 19
Network Planning Requirements
How to define dimensioning and costing units
for interconnection ?
– Requirements for service flow units to be used:
• Should be quantifiable with defined engineering rules
• Useful for interrelation between
demand/dimensioning/costing for a given QoS and SLA
• Reflecting service provisioning and market value across
multiple networks
• Applicable to multiservice/multimedia flows
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 20
Network Planning Requirements
Traffic units for aggregated flows
Proposal of NGN units in multiservice
networks/interfaces for
demand/dimensioning/costing :
– Equivalent Sustained Bit Rate (ESBR) or aggregated
equivalent rates for same QoS category flows efficiently
carried in a common reference busy period (ie. 5 minutes)
– Computed as weighted average for the services at QoS
category (i) and customer classes (j) at each network element:
∑i ∑j ESBRij
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 21
Network Planning NGN and IMS
Content
• Role of Network Planning
• Requirements
• Domains and methodology
• Network design issues in NGN
• Strategic Planning and Technology mapping
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 22
Network Planning Requirements
Solution Mapping
Solution mapping is more important today as the
number of technologies and network options increase
• Large variety of geo-scenarios within the country
• Geography
• User profiles
• Density
• Economy
• Alternatives modeled with all key parameters that characterize
scenario, services, demands and solutions
• Best solutions selected based on techno-economical evaluation
and resulting best Cost of Ownership
April-May, 2007
slide 23
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements Solution
Mapping: Methodology
Compliance
• Services
• Capacities
• Availability
• Operational
constraints
Projects/
Geo-scenarios
Input criteria
Selected
Scenarios
Techno-economical
Evaluation
• Architecture
• Density
• Capital expenditure
• NPV of full costs
• Entry costs
Network
Models
Mapping
Technical
Solutions
Results
Actions
Qualifiers
• Flexibility
• Speed to service
• Evolution
• Experience
Selected
Network
Solutions
Mapping
Economical
Solutions
Mapping
Qualified
Solutions
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
Recommendations
slide 24
Network Planning Requirements
Solution Mapping: Cost Modeling
OPERATING COSTS
CAPITAL COSTS
FULL COSTS
=
April-May, 2007
•
•
•
•
•
•
•
Electronic equipment
Cables/towers
Civil works
Licenses, permits
Installation
Replacement
Customer premises
equipment
+
• Rights of way
• Space rental
• Operations and
maintenance
• Power
• Management and
salaries
• Cost of inventory
• Marketing campaigns
• Overheads
slide 25
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements
Solution Mapping: Example of Geo Scenarios
Suburban
L1
L2
Metropolitan
L5
L4
L3
Villages
Rural clusters
L1: Distance between suburban
L2: Suburban - metropolitan distance
L3: Suburban - village distance
April-May, 2007
L4: Distance between villages
L5: Distance between rural
ITU/BDT Network Planning requirements - O.G.S.
slide 26
Network Planning Requirements
Solution Mapping:
Technological alternatives at access (Fixed)
Wireline
Direct: POTS /ISDN
RSU: POTS /ISDN
Point to Multipoint
Narrowband
(up to 144 Kbit/s)
Wireless
Satellite-Bidirectional
Multiservice DLC (FTTC)
xDSL
PLC
Access
Technologies
SDH/SONET Add Drop Mux
Wireline
FTTB/GPON/EPON
Ethernet
Broadband
CATV(HFC)
MMDS/WIP/WiMax
WLAN
Wireless
LMDS
Satellite-Bidirectional
DBS/DBT
April-May, 2007
slide 27
ITU/BDT Network Planning requirements - O.G.S.
Network Planning Requirements
Solution Mapping:
Investment sensitivity to density in WL Access
High density areas
300
250
Monetary units
Metrop. total
200
Metrop. infrastructure
150
Sub. infrastructure
Sub. total
100
50
2 355
2 477
2 235
2 112
1 990
1 870
1 747
1 625
1 381
1 504
1 259
1 139
894
1 016
774
529
651
0
Density (subscribers per KM²)
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 28
Network Planning Requirements
Example of mapping recommendation
Multiservice
and DSLAM
xDSL
8000
High
density
1000
Switching
based
access
(RSU)
GPON/FTTH
CATV/HFC
1000
Overlap area
Medium
density
Quantitative Dif. < 10%
200
- High 200
clustering
Low
density
20
- Low
clustering
0.5
Wireless Access
Narrowband
“Qualitative assignment”
assignment”
Wireless Access
Wideband/BB/WiMAX
Fixed GSM
Satellite
Satellite
Cust./Km2
Services
&Traffic
April-May, 2007
POTS/Fax
POTS/ISDN/Data
POTS/Data nx64
POTS/data/Video
Multimedia BB
ITU/BDT Network Planning requirements - O.G.S.
slide 29
Network Planning Requirements
Benefits of mapping and planning activities
• Saving factors of 20 to 200 % by adequate
solution/technology mapping in the access segment
• Additional gains between 20 to 40 % by topology/routing
optimization
• Anticipation of 2 to 3 years in the positive IRR
• Assure fulfillment of SLA and QoS
• Positioning of the operator in the top competition levels
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 30
Network Planning Requirements
Summary of Key Requirements
• Multiservice flows impose a set of requirements on models
and tools for NGN and 3G.
•
Interoperability and interconnection require special effort
to players and planners to ensure end-to-end performance
•
High number of new technologies and capabilities reinforce
the need of solution mapping for each country scenario
•
Complexity of converged networks require the use of high
quality support tools
April-May, 2007
ITU/BDT Network Planning requirements - O.G.S.
slide 31