Communication Network Simulations Using OPNET

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Albert Short
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1 521365S Tietoliikenteen simuloinnit ja työkalut Communication Network Simulations Using OPNET klo TS407 Juha-Pekka Mäkelä juha.makela AT ee.oulu.fi 1

2 Network simulations Simulations are used for Application Equipment Protocol (algorithm) Network security functionality verification and implementation comparison Modeling of a real communication network 2

3 Things that are simulated Packet transmission. Capacity Packet formation. Packet length and distribution Terminal entering and exiting networks Communication link setup between terminals Mobility Effect of disturbance of other transmissions 3

4 Results End to end delay Throughput Packet loss Congestion and lost connections Traffic distribution Network utilization 4

5 S Throughput ALOHA G 5

6 delay End to end delay G 6

7 Ad hoc networks MAC and Routing MAC TDMA, FDMA, CDMA, OFDMA, CSMA QoS Routing Proactive vs. reactive Scalability Routing overhead 7

8 Sensor networks Straight implementation Large amoung of sensors with low cost Embedded programming Only very big networks must be simulated. Enegry efficiency Protocol simplicity 8

9 Network simulators OPNET ( NS2 ( OMNeT++ ( 9

10 OPNET Event based discrete time simulator. Packet level simulations Developped for wireline simulations Currently also supports wireless system simulations Radio channel modelled accurately For R&D 10

11 Modelling Network Sub nets, topologies, geocraphical modelling, mobility Node Routers, servers, clients, mobile terminals etc. Process Protocols (TCP/IP), data generation, algorithms, etc External processeing possible (Matlab) 11

12 Tools in OPNET Network model editor Node model editor Process model editor Source code editing environment Antenna pattern editor Modulation curve editor (SNR BER behavior) Packet format editor Analysis configuration tool Simulation tool ICI editor (Interface Control Information) Probe model tool (organization of result collection) Link model editor (properties of fixed link models) Path model editor (for routing and modeling virtual circuits) Demand model editor (wide scale application modeling) OPNET Animation viewer 12

13 Network modeling 13

14 Network modeling (2) 14

15 Node modeling 15

16 Node modeling (2) Node structure OSI like presentation One node can also be a sub-network 16

17 Process modeling 17

18 Process modeling (2) Process models determine the functionality of the node model State machines Conditional transitions from state to another determined by external events 18

19 Process modeling (3) 19

20 Process modeling (4) Editor to help C/C++ code writing. 20

21 Parametrized simulations Simulation tool 21

22 Simulation tool (2) Simulations as a function of time Not enough for determining the full statistics of a phenomenon Several simulations needed with different seeds Typical results are averaged combinations of different iterations. 22

23 Analyze tool Tool for inspection of results Published results can be done with Matlab where there are more possibilities for editing the results Numerical values of the simulation results also available 23

24 Physical link (Radio) Physical link is presented with a connection where all the issues present in the physical layer are described. When a packet travels inside the simulation, the effect of all the states of the PHY layer is calculated The effect of other users also taken into account. All the states are presented with editable C/C++ code 24

25 Physical link (Radio)(2) Used connection components are determined by the transceiver attributes. The attributes can be altered during the simulation 25

26 Physical link (Radio)(3) BER for a BPSK moddulation 26

27 Antenna modeling 27

28 Packet editor Packet editor can be used for describing the transmission packets used for the simulation Length and content can be determined according to one s needs Data transmission among the simulation entities. 28

29 Network R&D OPNET products OPNET Modeler The main simulation & development tool+ Wireless suite and Defense additions Capacity management IT Guru (network and system capacity planning for enterprises) SP Guru (network planning and engineering for service providers) Network operations IT Sentinel (network audit, security, and policy compliance for enterprises ) SP Sentinel (network audit, security, and policy compliance for service providers) IT and ST Netcop (unified network views and situational awareness) Application performance management ACE Analyst (analytics for networked applications) ACE Live (enduser experience monitoring & realtime network analytics) SLA Commander (application service level monitoring) OPNET Panorama (realtime application monitoring and analytics)29

30 Options for OPNET Modeler UMTS (WCDMA) WiMAX ( , e2005) DOCSIS (Data Over Cable Service Interface Specification) IPv6 + Mobile IPv6 MPLS (MultiProtocol Label Switching) PNNI (Private NetworkNetwork Interface) Terrain Modeling TIREM (propagation modeling calculation) Satellite Capability (dozens of models for satellite systems) Joint Communications Simulation System (JCSS) (Military orientated models) Vendor Devices (Dozens of vendor specific devices) Integration with 3rd Party Products (several modules) 30

31 Summary OPNET is an event based (discrete time) communication network simulator software Networks modeled in three levels; network, node, process. Modeling can be done with the desired accuracy. External processing can be used. Vast number of additional features and tools to ease the problem solving 31

32 References OPNET Modeler + Wireless (version 16.0 (14.0)) OPNET (versions 16.0 (14.0)) Documentation OPNET Technologies, Inc. WWW page, 32

Preparation for OPNET Modeling

Part I Preparation for OPNET Modeling 1 Introduction This chapter introduces network modeling and simulation, and both OPNET and OPNET Modeler. If you already have relevant background, you can quickly