ITU / BDT- COE workshop
Nairobi, Kenya,
7 – 11 October 2002
Network Planning
Lecture NP- 4.3
Specific Network Planning
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 1
BDT - COE workshop on Network
Planning
Module 1: Introduction and Experiences in the Region
Module 2
Role of Network Planning in the current Telecom scenario
Module 3
Integrated Planning Process
Module 4
Specific Network Planning per Layer
Module 5
Supporting Network Planning Tools
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 2
Content Chapter 4.3
• Requirements for NM, IN, signalling
and/or Control network
planning
• Planning and Design principles for management, signalling and
control networks
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 3
Planning Methodology:
Multilayer planning sequence
Network Layers
Planning process
Data flows
Service and
Control level
NE dimensioning
Delay evaluation
Traffic Demand
Functional
level
Circuit location/design
Routing optimization
BW grooming
Route design/optim.
Transport/SDH
Infrastructure
and Cable level
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Path protection
Physical Layout
Cable routing/grouping
Node/duct sharing
Lecture NP - 4.3 - slide 4
Planning Control networks:
NM configuration
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 5
Planning Control networks:
NM key NE
Q3
Operation
System
Q3
MD
QX
October 9th
Q3
Q-A
NE
• Network Management System NMS
– HW&SW set embedded in the
Operation System(s)
– the Manager part of the TMN
– NMS interacts with EMS
through the DCN
NE
• Element Management System EMS
– HW&SW set embedded in the
Network Elements, Q-Adapters
or Mediation Devices
– the managed part of the TMN
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 6
Planning Control networks:
Issues and requirements
h
Location and Dimensioning for NMC, IN, PSS & PTS ?
h
Asignment for signaling associated services: O & M, IN, Control, Data ?
h
Routing procedures ?
h
Priority assignment per flow type ?
h
Integrated versus specialised structures ?
h
Impact due to massive traffics ?
h
Protection level to failures ?
h
Reserve Capacity for the service evolution ?
h
Evolution capability ?
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 7
Planning Control networks:
Planning steps
• Definition and characterization of the traffic flows
• Location for the specialized service nodes
• Structure for the interconnection
• Dimensioning for the communication links and control nodes
• Quality evaluation and reserve capacity
• Plan for the service and network grow
• Evaluation for the equipment and operational costs
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 8
Planning Control networks:
Traffic characteristics
• NM and OSS flow types
•
•
•
•
Constant rates for perodic tasks
Multiple short mesages
Random rates for failure events
Massive arrivals for generalized overloads
• IN and CSS flow types
• Correlated to call arrival and call processing rates
• Multiple short messages
• Massive calls (voting ...)
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 9
Planning Control networks: IN
configuration :
Nº 7
SCP
SMS
SE/SSP
X25/Nº 7
SE
RTPC
SSP: Service Switching Point
SCP: Service Control Point
SMS: Service Management System
SE: Switching Exchange
SE/SSP: Switching Exchange with SCP interface and SSP function
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 10
Planning Control networks:
IN Introduction in existing networks
SCP
SCP
SSP
Existing LEX
SSP
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 11
Planning Control networks:
SSP Location in overlay
SSPS overlay network
SCP
SSP
SSP
SSP
Nodal exchanges
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 12
Planning Control networks:
SSP location in nodal exchanges
SCP
Nodal exchanges + SSP
SSP
SSP
October 9th
SSP
SSP
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 13
Planning Control networks:
SSP location in local exchanges
SCP
SSP en
centrales
locales
SSP's at Local exchanges
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 14
Planning Control networks:
The Network Design Process
Message flow
demand
Services
demand
Routing and
dimensioning
Switching
architecture
Delay evaluation
NE
capacities
Teletraffic
models
Protection paths
Protection
level
QOS and Costing
NE costs
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 15
Planning Control networks:
Network design and dimensioning
• Location/Asociation of service/control elements over the PSTN
• Evaluation of new matrices on the functional network by aggregation
• Redimensining and reoptimization for the functional network
• Detailed dimensioning for the specific service/control NE
• Evaluation of critical performance parameters (transfer delays, end to
end delays, etc.)
• Determination of reserve capacity and protection to overload
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 16
Planning Control networks:
Basic models:
i
Network dimensioning
iMessage
iLoad
value lower than nominal capacity minus reserve capacity
iTransfer
i
processing modeled by queueing network methods
and end to end delays lower than specs
System and processor dimensioning
iProcessors
iMemory
based on customer number and service types
iResources
October 9th
dimensioned based on load and delay
dimensioned for specific (system dependent) rules
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 17
Planning Control networks:
Basic models:
i
Network dimensioning
iOpen
queues:
- Without feed-back:
λ
P*λ1
X=(1-p)*λ1=λ
- With feed-back:
Clients
…….
…….
iClosed
queues
Master
M Slaves
Arrival laws with peakdness factors and correlated
Holding times very short and heterogeneous
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 18
Planning Control networks:
Dimensioning Criteria
i High
i
connectivity degree:
All node pairs with 3 or more end to end
alternative paths
i High
i
protection reserve capacity:
Occupancy level lower than nominal even after a
single node/link failure
i High
performance- Low transfer delays at system
level and end to end network for quick reaction time
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 19
Planning Control networks:
Issues for the future
i Merging
for all flow control types while maintaining
high capacity and high security. Issues for OSI over
IP and IP over OSI
i Incorporate
new flows associated to new services
and Application Service Provisioning with high
demanding rates
i Protection
systems for cases of overload, massive
traffics and malicious interferences
October 9th
ITU/BDT-COE Network Planning/ Specific Planning - O.G.S.
Lecture NP - 4.3 - slide 20