OPNET for Network Simulation

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OPNET for Network Simulation

• Michael Jiang (zjiang_at_cs.sfu.ca)
• CNL Lab, School of Engineering Science

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A road map

• OPNET modeling paradigm
• Key words
• An example from our work
• Models already exist
• Useful sources

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Key words

• CDPD (Cellular Digital Packet Data)
• OPNET
• Long-range dependent
• Network model
• Node model
• Process model

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Modeling paradigm
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Modeling paradigm, cont

• Model the behavior of individual objects (queues,
  processors, , etc) at the Process Level
• Interconnect the individual objects to form
  devices at the Node Level
• Interconnect devices using links to form networks
  at the Network Level

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Modeling paradigm, cont

• OPNET Network Models define the position and
  interconnection of communicating entities, or
  nodes. Each node is described by a block
  structured data flow diagram, or
• OPNET Node Model, which typically depicts the
  interrelation of processes, protocols, and
  subsystems.
• Each programmable block in a Node Model has its
  functionality defined by an OPNET Process Model
  which combines the graphical power of a
  state-transition diagram with the flexibility of
  a standard programming language and a broad
  library of pre-defined modeling functions.

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Modeling paradigm, cont

• ANALYSIS
• Network Model
• Node Model
• Process Model

• DESIGN
• Process Model
• Node Model
• Network Model

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CDPD network architecture (an example)
M-ES Mobile End System. MDBS Mobile Database
Station. (RF to Landline relay) MD-IS Mobile
Data Intermediate System. (Mobility
management) IS Intermediate System. (Routers)
F-ES Fixed End System. A-Interface Air link
Interface. E-Interface External
Interface. I-Interface Interservice provider
Interface.
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Network model
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Network model, cont
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Node model for M-ES
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Process model for the mac module inside M-ES
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Node model of the mdbs
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Process model of the mac module inside mdbs
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Simulation results with different traffic sources

• Poisson arrival traffic
• Genuine trace from BCTel Mobility

• Same average inter-arrival time 0.73 sec
• Same average packet size 960bits
• Simulation time 60 seconds

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Simulation Results
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www.mil3.com
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Suggestions

• Choose a smaller topic
• Simplify your OPNET models
• Some useful sources
• Online documentation
• www.mil3.com
• /usr/local-bell/opnet6/6.0.L/models
• zjiang_at_cs.sfu.ca

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